riscv-gnu-toolchain/llvm.git - Unnamed repository; edit this file 'description' to name the repository.

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Diffstat (limited to 'llvm/lib/Support/LockFileManager.cpp')

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/* tc-mips.c -- assemble code for a MIPS chip. Copyright (C) 1993-2016 Free Software Foundation, Inc. Contributed by the OSF and Ralph Campbell. Written by Keith Knowles and Ralph Campbell, working independently. Modified for ECOFF and R4000 support by Ian Lance Taylor of Cygnus Support. This file is part of GAS. GAS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GAS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GAS; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "as.h" #include "config.h" #include "subsegs.h" #include "safe-ctype.h" #include "opcode/mips.h" #include "itbl-ops.h" #include "dwarf2dbg.h" #include "dw2gencfi.h" /* Check assumptions made in this file. */ typedef char static_assert1[sizeof (offsetT) < 8 ? -1 : 1]; typedef char static_assert2[sizeof (valueT) < 8 ? -1 : 1]; #ifdef DEBUG #define DBG(x) printf x #else #define DBG(x) #endif #define streq(a, b) (strcmp (a, b) == 0) #define SKIP_SPACE_TABS(S) \ do { while (*(S) == ' ' || *(S) == '\t') ++(S); } while (0) /* Clean up namespace so we can include obj-elf.h too. */ static int mips_output_flavor (void); static int mips_output_flavor (void) { return OUTPUT_FLAVOR; } #undef OBJ_PROCESS_STAB #undef OUTPUT_FLAVOR #undef S_GET_ALIGN #undef S_GET_SIZE #undef S_SET_ALIGN #undef S_SET_SIZE #undef obj_frob_file #undef obj_frob_file_after_relocs #undef obj_frob_symbol #undef obj_pop_insert #undef obj_sec_sym_ok_for_reloc #undef OBJ_COPY_SYMBOL_ATTRIBUTES #include "obj-elf.h" /* Fix any of them that we actually care about. */ #undef OUTPUT_FLAVOR #define OUTPUT_FLAVOR mips_output_flavor() #include "elf/mips.h" #ifndef ECOFF_DEBUGGING #define NO_ECOFF_DEBUGGING #define ECOFF_DEBUGGING 0 #endif int mips_flag_mdebug = -1; /* Control generation of .pdr sections. Off by default on IRIX: the native linker doesn't know about and discards them, but relocations against them remain, leading to rld crashes. */ #ifdef TE_IRIX int mips_flag_pdr = FALSE; #else int mips_flag_pdr = TRUE; #endif #include "ecoff.h" static char *mips_regmask_frag; static char *mips_flags_frag; #define ZERO 0 #define ATREG 1 #define S0 16 #define S7 23 #define TREG 24 #define PIC_CALL_REG 25 #define KT0 26 #define KT1 27 #define GP 28 #define SP 29 #define FP 30 #define RA 31 #define ILLEGAL_REG (32) #define AT mips_opts.at extern int target_big_endian; /* The name of the readonly data section. */ #define RDATA_SECTION_NAME ".rodata" /* Ways in which an instruction can be "appended" to the output. */ enum append_method { /* Just add it normally. */ APPEND_ADD, /* Add it normally and then add a nop. */ APPEND_ADD_WITH_NOP, /* Turn an instruction with a delay slot into a "compact" version. */ APPEND_ADD_COMPACT, /* Insert the instruction before the last one. */ APPEND_SWAP }; /* Information about an instruction, including its format, operands and fixups. */ struct mips_cl_insn { /* The opcode's entry in mips_opcodes or mips16_opcodes. */ const struct mips_opcode *insn_mo; /* The 16-bit or 32-bit bitstring of the instruction itself. This is a copy of INSN_MO->match with the operands filled in. If we have decided to use an extended MIPS16 instruction, this includes the extension. */ unsigned long insn_opcode; /* The frag that contains the instruction. */ struct frag *frag; /* The offset into FRAG of the first instruction byte. */ long where; /* The relocs associated with the instruction, if any. */ fixS *fixp[3]; /* True if this entry cannot be moved from its current position. */ unsigned int fixed_p : 1; /* True if this instruction occurred in a .set noreorder block. */ unsigned int noreorder_p : 1; /* True for mips16 instructions that jump to an absolute address. */ unsigned int mips16_absolute_jump_p : 1; /* True if this instruction is complete. */ unsigned int complete_p : 1; /* True if this instruction is cleared from history by unconditional branch. */ unsigned int cleared_p : 1; }; /* The ABI to use. */ enum mips_abi_level { NO_ABI = 0, O32_ABI, O64_ABI, N32_ABI, N64_ABI, EABI_ABI }; /* MIPS ABI we are using for this output file. */ static enum mips_abi_level mips_abi = NO_ABI; /* Whether or not we have code that can call pic code. */ int mips_abicalls = FALSE; /* Whether or not we have code which can be put into a shared library. */ static bfd_boolean mips_in_shared = TRUE; /* This is the set of options which may be modified by the .set pseudo-op. We use a struct so that .set push and .set pop are more reliable. */ struct mips_set_options { /* MIPS ISA (Instruction Set Architecture) level. This is set to -1 if it has not been initialized. Changed by `.set mipsN', and the -mipsN command line option, and the default CPU. */ int isa; /* Enabled Application Specific Extensions (ASEs). Changed by `.set <asename>', by command line options, and based on the default architecture. */ int ase; /* Whether we are assembling for the mips16 processor. 0 if we are not, 1 if we are, and -1 if the value has not been initialized. Changed by `.set mips16' and `.set nomips16', and the -mips16 and -nomips16 command line options, and the default CPU. */ int mips16; /* Whether we are assembling for the mipsMIPS ASE. 0 if we are not, 1 if we are, and -1 if the value has not been initialized. Changed by `.set micromips' and `.set nomicromips', and the -mmicromips and -mno-micromips command line options, and the default CPU. */ int micromips; /* Non-zero if we should not reorder instructions. Changed by `.set reorder' and `.set noreorder'. */ int noreorder; /* Non-zero if we should not permit the register designated "assembler temporary" to be used in instructions. The value is the register number, normally $at ($1). Changed by `.set at=REG', `.set noat' (same as `.set at=$0') and `.set at' (same as `.set at=$1'). */ unsigned int at; /* Non-zero if we should warn when a macro instruction expands into more than one machine instruction. Changed by `.set nomacro' and `.set macro'. */ int warn_about_macros; /* Non-zero if we should not move instructions. Changed by `.set move', `.set volatile', `.set nomove', and `.set novolatile'. */ int nomove; /* Non-zero if we should not optimize branches by moving the target of the branch into the delay slot. Actually, we don't perform this optimization anyhow. Changed by `.set bopt' and `.set nobopt'. */ int nobopt; /* Non-zero if we should not autoextend mips16 instructions. Changed by `.set autoextend' and `.set noautoextend'. */ int noautoextend; /* True if we should only emit 32-bit microMIPS instructions. Changed by `.set insn32' and `.set noinsn32', and the -minsn32 and -mno-insn32 command line options. */ bfd_boolean insn32; /* Restrict general purpose registers and floating point registers to 32 bit. This is initially determined when -mgp32 or -mfp32 is passed but can changed if the assembler code uses .set mipsN. */ int gp; int fp; /* MIPS architecture (CPU) type. Changed by .set arch=FOO, the -march command line option, and the default CPU. */ int arch; /* True if ".set sym32" is in effect. */ bfd_boolean sym32; /* True if floating-point operations are not allowed. Changed by .set softfloat or .set hardfloat, by command line options -msoft-float or -mhard-float. The default is false. */ bfd_boolean soft_float; /* True if only single-precision floating-point operations are allowed. Changed by .set singlefloat or .set doublefloat, command-line options -msingle-float or -mdouble-float. The default is false. */ bfd_boolean single_float; /* 1 if single-precision operations on odd-numbered registers are allowed. */ int oddspreg; }; /* Specifies whether module level options have been checked yet. */ static bfd_boolean file_mips_opts_checked = FALSE; /* Do we support nan2008? 0 if we don't, 1 if we do, and -1 if the value has not been initialized. Changed by `.nan legacy' and `.nan 2008', and the -mnan=legacy and -mnan=2008 command line options, and the default CPU. */ static int mips_nan2008 = -1; /* This is the struct we use to hold the module level set of options. Note that we must set the isa field to ISA_UNKNOWN and the ASE, gp and fp fields to -1 to indicate that they have not been initialized. */ static struct mips_set_options file_mips_opts = { /* isa */ ISA_UNKNOWN, /* ase */ 0, /* mips16 */ -1, /* micromips */ -1, /* noreorder */ 0, /* at */ ATREG, /* warn_about_macros */ 0, /* nomove */ 0, /* nobopt */ 0, /* noautoextend */ 0, /* insn32 */ FALSE, /* gp */ -1, /* fp */ -1, /* arch */ CPU_UNKNOWN, /* sym32 */ FALSE, /* soft_float */ FALSE, /* single_float */ FALSE, /* oddspreg */ -1 }; /* This is similar to file_mips_opts, but for the current set of options. */ static struct mips_set_options mips_opts = { /* isa */ ISA_UNKNOWN, /* ase */ 0, /* mips16 */ -1, /* micromips */ -1, /* noreorder */ 0, /* at */ ATREG, /* warn_about_macros */ 0, /* nomove */ 0, /* nobopt */ 0, /* noautoextend */ 0, /* insn32 */ FALSE, /* gp */ -1, /* fp */ -1, /* arch */ CPU_UNKNOWN, /* sym32 */ FALSE, /* soft_float */ FALSE, /* single_float */ FALSE, /* oddspreg */ -1 }; /* Which bits of file_ase were explicitly set or cleared by ASE options. */ static unsigned int file_ase_explicit; /* These variables are filled in with the masks of registers used. The object format code reads them and puts them in the appropriate place. */ unsigned long mips_gprmask; unsigned long mips_cprmask[4]; /* True if any MIPS16 code was produced. */ static int file_ase_mips16; #define ISA_SUPPORTS_MIPS16E (mips_opts.isa == ISA_MIPS32 \ || mips_opts.isa == ISA_MIPS32R2 \ || mips_opts.isa == ISA_MIPS32R3 \ || mips_opts.isa == ISA_MIPS32R5 \ || mips_opts.isa == ISA_MIPS64 \ || mips_opts.isa == ISA_MIPS64R2 \ || mips_opts.isa == ISA_MIPS64R3 \ || mips_opts.isa == ISA_MIPS64R5) /* True if any microMIPS code was produced. */ static int file_ase_micromips; /* True if we want to create R_MIPS_JALR for jalr $25. */ #ifdef TE_IRIX #define MIPS_JALR_HINT_P(EXPR) HAVE_NEWABI #else /* As a GNU extension, we use R_MIPS_JALR for o32 too. However, because there's no place for any addend, the only acceptable expression is a bare symbol. */ #define MIPS_JALR_HINT_P(EXPR) \ (!HAVE_IN_PLACE_ADDENDS \ || ((EXPR)->X_op == O_symbol && (EXPR)->X_add_number == 0)) #endif /* The argument of the -march= flag. The architecture we are assembling. */ static const char *mips_arch_string; /* The argument of the -mtune= flag. The architecture for which we are optimizing. */ static int mips_tune = CPU_UNKNOWN; static const char *mips_tune_string; /* True when generating 32-bit code for a 64-bit processor. */ static int mips_32bitmode = 0; /* True if the given ABI requires 32-bit registers. */ #define ABI_NEEDS_32BIT_REGS(ABI) ((ABI) == O32_ABI) /* Likewise 64-bit registers. */ #define ABI_NEEDS_64BIT_REGS(ABI) \ ((ABI) == N32_ABI \ || (ABI) == N64_ABI \ || (ABI) == O64_ABI) #define ISA_IS_R6(ISA) \ ((ISA) == ISA_MIPS32R6 \ || (ISA) == ISA_MIPS64R6) /* Return true if ISA supports 64 bit wide gp registers. */ #define ISA_HAS_64BIT_REGS(ISA) \ ((ISA) == ISA_MIPS3 \ || (ISA) == ISA_MIPS4 \ || (ISA) == ISA_MIPS5 \ || (ISA) == ISA_MIPS64 \ || (ISA) == ISA_MIPS64R2 \ || (ISA) == ISA_MIPS64R3 \ || (ISA) == ISA_MIPS64R5 \ || (ISA) == ISA_MIPS64R6) /* Return true if ISA supports 64 bit wide float registers. */ #define ISA_HAS_64BIT_FPRS(ISA) \ ((ISA) == ISA_MIPS3 \ || (ISA) == ISA_MIPS4 \ || (ISA) == ISA_MIPS5 \ || (ISA) == ISA_MIPS32R2 \ || (ISA) == ISA_MIPS32R3 \ || (ISA) == ISA_MIPS32R5 \ || (ISA) == ISA_MIPS32R6 \ || (ISA) == ISA_MIPS64 \ || (ISA) == ISA_MIPS64R2 \ || (ISA) == ISA_MIPS64R3 \ || (ISA) == ISA_MIPS64R5 \ || (ISA) == ISA_MIPS64R6) /* Return true if ISA supports 64-bit right rotate (dror et al.) instructions. */ #define ISA_HAS_DROR(ISA) \ ((ISA) == ISA_MIPS64R2 \ || (ISA) == ISA_MIPS64R3 \ || (ISA) == ISA_MIPS64R5 \ || (ISA) == ISA_MIPS64R6 \ || (mips_opts.micromips \ && ISA_HAS_64BIT_REGS (ISA)) \ ) /* Return true if ISA supports 32-bit right rotate (ror et al.) instructions. */ #define ISA_HAS_ROR(ISA) \ ((ISA) == ISA_MIPS32R2 \ || (ISA) == ISA_MIPS32R3 \ || (ISA) == ISA_MIPS32R5 \ || (ISA) == ISA_MIPS32R6 \ || (ISA) == ISA_MIPS64R2 \ || (ISA) == ISA_MIPS64R3 \ || (ISA) == ISA_MIPS64R5 \ || (ISA) == ISA_MIPS64R6 \ || (mips_opts.ase & ASE_SMARTMIPS) \ || mips_opts.micromips \ ) /* Return true if ISA supports single-precision floats in odd registers. */ #define ISA_HAS_ODD_SINGLE_FPR(ISA, CPU)\ (((ISA) == ISA_MIPS32 \ || (ISA) == ISA_MIPS32R2 \ || (ISA) == ISA_MIPS32R3 \ || (ISA) == ISA_MIPS32R5 \ || (ISA) == ISA_MIPS32R6 \ || (ISA) == ISA_MIPS64 \ || (ISA) == ISA_MIPS64R2 \ || (ISA) == ISA_MIPS64R3 \ || (ISA) == ISA_MIPS64R5 \ || (ISA) == ISA_MIPS64R6 \ || (CPU) == CPU_R5900) \ && (CPU) != CPU_LOONGSON_3A) /* Return true if ISA supports move to/from high part of a 64-bit floating-point register. */ #define ISA_HAS_MXHC1(ISA) \ ((ISA) == ISA_MIPS32R2 \ || (ISA) == ISA_MIPS32R3 \ || (ISA) == ISA_MIPS32R5 \ || (ISA) == ISA_MIPS32R6 \ || (ISA) == ISA_MIPS64R2 \ || (ISA) == ISA_MIPS64R3 \ || (ISA) == ISA_MIPS64R5 \ || (ISA) == ISA_MIPS64R6) /* Return true if ISA supports legacy NAN. */ #define ISA_HAS_LEGACY_NAN(ISA) \ ((ISA) == ISA_MIPS1 \ || (ISA) == ISA_MIPS2 \ || (ISA) == ISA_MIPS3 \ || (ISA) == ISA_MIPS4 \ || (ISA) == ISA_MIPS5 \ || (ISA) == ISA_MIPS32 \ || (ISA) == ISA_MIPS32R2 \ || (ISA) == ISA_MIPS32R3 \ || (ISA) == ISA_MIPS32R5 \ || (ISA) == ISA_MIPS64 \ || (ISA) == ISA_MIPS64R2 \ || (ISA) == ISA_MIPS64R3 \ || (ISA) == ISA_MIPS64R5) #define GPR_SIZE \ (mips_opts.gp == 64 && !ISA_HAS_64BIT_REGS (mips_opts.isa) \ ? 32 \ : mips_opts.gp) #define FPR_SIZE \ (mips_opts.fp == 64 && !ISA_HAS_64BIT_FPRS (mips_opts.isa) \ ? 32 \ : mips_opts.fp) #define HAVE_NEWABI (mips_abi == N32_ABI || mips_abi == N64_ABI) #define HAVE_64BIT_OBJECTS (mips_abi == N64_ABI) /* True if relocations are stored in-place. */ #define HAVE_IN_PLACE_ADDENDS (!HAVE_NEWABI) /* The ABI-derived address size. */ #define HAVE_64BIT_ADDRESSES \ (GPR_SIZE == 64 && (mips_abi == EABI_ABI || mips_abi == N64_ABI)) #define HAVE_32BIT_ADDRESSES (!HAVE_64BIT_ADDRESSES) /* The size of symbolic constants (i.e., expressions of the form "SYMBOL" or "SYMBOL + OFFSET"). */ #define HAVE_32BIT_SYMBOLS \ (HAVE_32BIT_ADDRESSES || !HAVE_64BIT_OBJECTS || mips_opts.sym32) #define HAVE_64BIT_SYMBOLS (!HAVE_32BIT_SYMBOLS) /* Addresses are loaded in different ways, depending on the address size in use. The n32 ABI Documentation also mandates the use of additions with overflow checking, but existing implementations don't follow it. */ #define ADDRESS_ADD_INSN \ (HAVE_32BIT_ADDRESSES ? "addu" : "daddu") #define ADDRESS_ADDI_INSN \ (HAVE_32BIT_ADDRESSES ? "addiu" : "daddiu") #define ADDRESS_LOAD_INSN \ (HAVE_32BIT_ADDRESSES ? "lw" : "ld") #define ADDRESS_STORE_INSN \ (HAVE_32BIT_ADDRESSES ? "sw" : "sd") /* Return true if the given CPU supports the MIPS16 ASE. */ #define CPU_HAS_MIPS16(cpu) \ (strncmp (TARGET_CPU, "mips16", sizeof ("mips16") - 1) == 0 \ || strncmp (TARGET_CANONICAL, "mips-lsi-elf", sizeof ("mips-lsi-elf") - 1) == 0) /* Return true if the given CPU supports the microMIPS ASE. */ #define CPU_HAS_MICROMIPS(cpu) 0 /* True if CPU has a dror instruction. */ #define CPU_HAS_DROR(CPU) ((CPU) == CPU_VR5400 || (CPU) == CPU_VR5500) /* True if CPU has a ror instruction. */ #define CPU_HAS_ROR(CPU) CPU_HAS_DROR (CPU) /* True if CPU is in the Octeon family */ #define CPU_IS_OCTEON(CPU) ((CPU) == CPU_OCTEON || (CPU) == CPU_OCTEONP \ || (CPU) == CPU_OCTEON2 || (CPU) == CPU_OCTEON3) /* True if CPU has seq/sne and seqi/snei instructions. */ #define CPU_HAS_SEQ(CPU) (CPU_IS_OCTEON (CPU)) /* True, if CPU has support for ldc1 and sdc1. */ #define CPU_HAS_LDC1_SDC1(CPU) \ ((mips_opts.isa != ISA_MIPS1) && ((CPU) != CPU_R5900)) /* True if mflo and mfhi can be immediately followed by instructions which write to the HI and LO registers. According to MIPS specifications, MIPS ISAs I, II, and III need (at least) two instructions between the reads of HI/LO and instructions which write them, and later ISAs do not. Contradicting the MIPS specifications, some MIPS IV processor user manuals (e.g. the UM for the NEC Vr5000) document needing the instructions between HI/LO reads and writes, as well. Therefore, we declare only MIPS32, MIPS64 and later ISAs to have the interlocks, plus any specific earlier-ISA CPUs for which CPU documentation declares that the instructions are really interlocked. */ #define hilo_interlocks \ (mips_opts.isa == ISA_MIPS32 \ || mips_opts.isa == ISA_MIPS32R2 \ || mips_opts.isa == ISA_MIPS32R3 \ || mips_opts.isa == ISA_MIPS32R5 \ || mips_opts.isa == ISA_MIPS32R6 \ || mips_opts.isa == ISA_MIPS64 \ || mips_opts.isa == ISA_MIPS64R2 \ || mips_opts.isa == ISA_MIPS64R3 \ || mips_opts.isa == ISA_MIPS64R5 \ || mips_opts.isa == ISA_MIPS64R6 \ || mips_opts.arch == CPU_R4010 \ || mips_opts.arch == CPU_R5900 \ || mips_opts.arch == CPU_R10000 \ || mips_opts.arch == CPU_R12000 \ || mips_opts.arch == CPU_R14000 \ || mips_opts.arch == CPU_R16000 \ || mips_opts.arch == CPU_RM7000 \ || mips_opts.arch == CPU_VR5500 \ || mips_opts.micromips \ ) /* Whether the processor uses hardware interlocks to protect reads from the GPRs after they are loaded from memory, and thus does not require nops to be inserted. This applies to instructions marked INSN_LOAD_MEMORY. These nops are only required at MIPS ISA level I and microMIPS mode instructions are always interlocked. */ #define gpr_interlocks \ (mips_opts.isa != ISA_MIPS1 \ || mips_opts.arch == CPU_R3900 \ || mips_opts.arch == CPU_R5900 \ || mips_opts.micromips \ ) /* Whether the processor uses hardware interlocks to avoid delays required by coprocessor instructions, and thus does not require nops to be inserted. This applies to instructions marked INSN_LOAD_COPROC, INSN_COPROC_MOVE, and to delays between instructions marked INSN_WRITE_COND_CODE and ones marked INSN_READ_COND_CODE. These nops are only required at MIPS ISA levels I, II, and III and microMIPS mode instructions are always interlocked. */ /* Itbl support may require additional care here. */ #define cop_interlocks \ ((mips_opts.isa != ISA_MIPS1 \ && mips_opts.isa != ISA_MIPS2 \ && mips_opts.isa != ISA_MIPS3) \ || mips_opts.arch == CPU_R4300 \ || mips_opts.micromips \ ) /* Whether the processor uses hardware interlocks to protect reads from coprocessor registers after they are loaded from memory, and thus does not require nops to be inserted. This applies to instructions marked INSN_COPROC_MEMORY_DELAY. These nops are only requires at MIPS ISA level I and microMIPS mode instructions are always interlocked. */ #define cop_mem_interlocks \ (mips_opts.isa != ISA_MIPS1 \ || mips_opts.micromips \ ) /* Is this a mfhi or mflo instruction? */ #define MF_HILO_INSN(PINFO) \ ((PINFO & INSN_READ_HI) || (PINFO & INSN_READ_LO)) /* Whether code compression (either of the MIPS16 or the microMIPS ASEs) has been selected. This implies, in particular, that addresses of text labels have their LSB set. */ #define HAVE_CODE_COMPRESSION \ ((mips_opts.mips16 | mips_opts.micromips) != 0) /* The minimum and maximum signed values that can be stored in a GPR. */ #define GPR_SMAX ((offsetT) (((valueT) 1 << (GPR_SIZE - 1)) - 1)) #define GPR_SMIN (-GPR_SMAX - 1) /* MIPS PIC level. */ enum mips_pic_level mips_pic; /* 1 if we should generate 32 bit offsets from the $gp register in SVR4_PIC mode. Currently has no meaning in other modes. */ static int mips_big_got = 0; /* 1 if trap instructions should used for overflow rather than break instructions. */ static int mips_trap = 0; /* 1 if double width floating point constants should not be constructed by assembling two single width halves into two single width floating point registers which just happen to alias the double width destination register. On some architectures this aliasing can be disabled by a bit in the status register, and the setting of this bit cannot be determined automatically at assemble time. */ static int mips_disable_float_construction; /* Non-zero if any .set noreorder directives were used. */ static int mips_any_noreorder; /* Non-zero if nops should be inserted when the register referenced in an mfhi/mflo instruction is read in the next two instructions. */ static int mips_7000_hilo_fix; /* The size of objects in the small data section. */ static unsigned int g_switch_value = 8; /* Whether the -G option was used. */ static int g_switch_seen = 0; #define N_RMASK 0xc4 #define N_VFP 0xd4 /* If we can determine in advance that GP optimization won't be possible, we can skip the relaxation stuff that tries to produce GP-relative references. This makes delay slot optimization work better. This function can only provide a guess, but it seems to work for gcc output. It needs to guess right for gcc, otherwise gcc will put what it thinks is a GP-relative instruction in a branch delay slot. I don't know if a fix is needed for the SVR4_PIC mode. I've only fixed it for the non-PIC mode. KR 95/04/07 */ static int nopic_need_relax (symbolS *, int); /* handle of the OPCODE hash table */ static struct hash_control *op_hash = NULL; /* The opcode hash table we use for the mips16. */ static struct hash_control *mips16_op_hash = NULL; /* The opcode hash table we use for the microMIPS ASE. */ static struct hash_control *micromips_op_hash = NULL; /* This array holds the chars that always start a comment. If the pre-processor is disabled, these aren't very useful */ const char comment_chars[] = "#"; /* This array holds the chars that only start a comment at the beginning of a line. If the line seems to have the form '# 123 filename' .line and .file directives will appear in the pre-processed output */ /* Note that input_file.c hand checks for '#' at the beginning of the first line of the input file. This is because the compiler outputs #NO_APP at the beginning of its output. */ /* Also note that C style comments are always supported. */ const char line_comment_chars[] = "#"; /* This array holds machine specific line separator characters. */ const char line_separator_chars[] = ";"; /* Chars that can be used to separate mant from exp in floating point nums */ const char EXP_CHARS[] = "eE"; /* Chars that mean this number is a floating point constant */ /* As in 0f12.456 */ /* or 0d1.2345e12 */ const char FLT_CHARS[] = "rRsSfFdDxXpP"; /* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be changed in read.c . Ideally it shouldn't have to know about it at all, but nothing is ideal around here. */ /* Types of printf format used for instruction-related error messages. "I" means int ("%d") and "S" means string ("%s"). */ enum mips_insn_error_format { ERR_FMT_PLAIN, ERR_FMT_I, ERR_FMT_SS, }; /* Information about an error that was found while assembling the current instruction. */ struct mips_insn_error { /* We sometimes need to match an instruction against more than one opcode table entry. Errors found during this matching are reported against a particular syntactic argument rather than against the instruction as a whole. We grade these messages so that errors against argument N have a greater priority than an error against any argument < N, since the former implies that arguments up to N were acceptable and that the opcode entry was therefore a closer match. If several matches report an error against the same argument, we only use that error if it is the same in all cases. min_argnum is the minimum argument number for which an error message should be accepted. It is 0 if MSG is against the instruction as a whole. */ int min_argnum; /* The printf()-style message, including its format and arguments. */ enum mips_insn_error_format format; const char *msg; union { int i; const char *ss[2]; } u; }; /* The error that should be reported for the current instruction. */ static struct mips_insn_error insn_error; static int auto_align = 1; /* When outputting SVR4 PIC code, the assembler needs to know the offset in the stack frame from which to restore the $gp register. This is set by the .cprestore pseudo-op, and saved in this variable. */ static offsetT mips_cprestore_offset = -1; /* Similar for NewABI PIC code, where $gp is callee-saved. NewABI has some more optimizations, it can use a register value instead of a memory-saved offset and even an other register than $gp as global pointer. */ static offsetT mips_cpreturn_offset = -1; static int mips_cpreturn_register = -1; static int mips_gp_register = GP; static int mips_gprel_offset = 0; /* Whether mips_cprestore_offset has been set in the current function (or whether it has already been warned about, if not). */ static int mips_cprestore_valid = 0; /* This is the register which holds the stack frame, as set by the .frame pseudo-op. This is needed to implement .cprestore. */ static int mips_frame_reg = SP; /* Whether mips_frame_reg has been set in the current function (or whether it has already been warned about, if not). */ static int mips_frame_reg_valid = 0; /* To output NOP instructions correctly, we need to keep information about the previous two instructions. */ /* Whether we are optimizing. The default value of 2 means to remove unneeded NOPs and swap branch instructions when possible. A value of 1 means to not swap branches. A value of 0 means to always insert NOPs. */ static int mips_optimize = 2; /* Debugging level. -g sets this to 2. -gN sets this to N. -g0 is equivalent to seeing no -g option at all. */ static int mips_debug = 0; /* The maximum number of NOPs needed to avoid the VR4130 mflo/mfhi errata. */ #define MAX_VR4130_NOPS 4 /* The maximum number of NOPs needed to fill delay slots. */ #define MAX_DELAY_NOPS 2 /* The maximum number of NOPs needed for any purpose. */ #define MAX_NOPS 4 /* A list of previous instructions, with index 0 being the most recent. We need to look back MAX_NOPS instructions when filling delay slots or working around processor errata. We need to look back one instruction further if we're thinking about using history[0] to fill a branch delay slot. */ static struct mips_cl_insn history[1 + MAX_NOPS]; /* Arrays of operands for each instruction. */ #define MAX_OPERANDS 6 struct mips_operand_array { const struct mips_operand *operand[MAX_OPERANDS]; }; static struct mips_operand_array *mips_operands; static struct mips_operand_array *mips16_operands; static struct mips_operand_array *micromips_operands; /* Nop instructions used by emit_nop. */ static struct mips_cl_insn nop_insn; static struct mips_cl_insn mips16_nop_insn; static struct mips_cl_insn micromips_nop16_insn; static struct mips_cl_insn micromips_nop32_insn; /* The appropriate nop for the current mode. */ #define NOP_INSN (mips_opts.mips16 \ ? &mips16_nop_insn \ : (mips_opts.micromips \ ? (mips_opts.insn32 \ ? &micromips_nop32_insn \ : &micromips_nop16_insn) \ : &nop_insn)) /* The size of NOP_INSN in bytes. */ #define NOP_INSN_SIZE ((mips_opts.mips16 \ || (mips_opts.micromips && !mips_opts.insn32)) \ ? 2 : 4) /* If this is set, it points to a frag holding nop instructions which were inserted before the start of a noreorder section. If those nops turn out to be unnecessary, the size of the frag can be decreased. */ static fragS *prev_nop_frag; /* The number of nop instructions we created in prev_nop_frag. */ static int prev_nop_frag_holds; /* The number of nop instructions that we know we need in prev_nop_frag. */ static int prev_nop_frag_required; /* The number of instructions we've seen since prev_nop_frag. */ static int prev_nop_frag_since; /* Relocations against symbols are sometimes done in two parts, with a HI relocation and a LO relocation. Each relocation has only 16 bits of space to store an addend. This means that in order for the linker to handle carries correctly, it must be able to locate both the HI and the LO relocation. This means that the relocations must appear in order in the relocation table. In order to implement this, we keep track of each unmatched HI relocation. We then sort them so that they immediately precede the corresponding LO relocation. */ struct mips_hi_fixup { /* Next HI fixup. */ struct mips_hi_fixup *next; /* This fixup. */ fixS *fixp; /* The section this fixup is in. */ segT seg; }; /* The list of unmatched HI relocs. */ static struct mips_hi_fixup *mips_hi_fixup_list; /* The frag containing the last explicit relocation operator. Null if explicit relocations have not been used. */ static fragS *prev_reloc_op_frag; /* Map mips16 register numbers to normal MIPS register numbers. */ static const unsigned int mips16_to_32_reg_map[] = { 16, 17, 2, 3, 4, 5, 6, 7 }; /* Map microMIPS register numbers to normal MIPS register numbers. */ #define micromips_to_32_reg_d_map mips16_to_32_reg_map /* The microMIPS registers with type h. */ static const unsigned int micromips_to_32_reg_h_map1[] = { 5, 5, 6, 4, 4, 4, 4, 4 }; static const unsigned int micromips_to_32_reg_h_map2[] = { 6, 7, 7, 21, 22, 5, 6, 7 }; /* The microMIPS registers with type m. */ static const unsigned int micromips_to_32_reg_m_map[] = { 0, 17, 2, 3, 16, 18, 19, 20 }; #define micromips_to_32_reg_n_map micromips_to_32_reg_m_map /* Classifies the kind of instructions we're interested in when implementing -mfix-vr4120. */ enum fix_vr4120_class { FIX_VR4120_MACC, FIX_VR4120_DMACC, FIX_VR4120_MULT, FIX_VR4120_DMULT, FIX_VR4120_DIV, FIX_VR4120_MTHILO, NUM_FIX_VR4120_CLASSES }; /* ...likewise -mfix-loongson2f-jump. */ static bfd_boolean mips_fix_loongson2f_jump; /* ...likewise -mfix-loongson2f-nop. */ static bfd_boolean mips_fix_loongson2f_nop; /* True if -mfix-loongson2f-nop or -mfix-loongson2f-jump passed. */ static bfd_boolean mips_fix_loongson2f; /* Given two FIX_VR4120_* values X and Y, bit Y of element X is set if there must be at least one other instruction between an instruction of type X and an instruction of type Y. */ static unsigned int vr4120_conflicts[NUM_FIX_VR4120_CLASSES]; /* True if -mfix-vr4120 is in force. */ static int mips_fix_vr4120; /* ...likewise -mfix-vr4130. */ static int mips_fix_vr4130; /* ...likewise -mfix-24k. */ static int mips_fix_24k; /* ...likewise -mfix-rm7000 */ static int mips_fix_rm7000; /* ...likewise -mfix-cn63xxp1 */ static bfd_boolean mips_fix_cn63xxp1; /* We don't relax branches by default, since this causes us to expand `la .l2 - .l1' if there's a branch between .l1 and .l2, because we fail to compute the offset before expanding the macro to the most efficient expansion. */ static int mips_relax_branch; /* The expansion of many macros depends on the type of symbol that they refer to. For example, when generating position-dependent code, a macro that refers to a symbol may have two different expansions, one which uses GP-relative addresses and one which uses absolute addresses. When generating SVR4-style PIC, a macro may have different expansions for local and global symbols. We handle these situations by generating both sequences and putting them in variant frags. In position-dependent code, the first sequence will be the GP-relative one and the second sequence will be the absolute one. In SVR4 PIC, the first sequence will be for global symbols and the second will be for local symbols. The frag's "subtype" is RELAX_ENCODE (FIRST, SECOND), where FIRST and SECOND are the lengths of the two sequences in bytes. These fields can be extracted using RELAX_FIRST() and RELAX_SECOND(). In addition, the subtype has the following flags: RELAX_USE_SECOND Set if it has been decided that we should use the second sequence instead of the first. RELAX_SECOND_LONGER Set in the first variant frag if the macro's second implementation is longer than its first. This refers to the macro as a whole, not an individual relaxation. RELAX_NOMACRO Set in the first variant frag if the macro appeared in a .set nomacro block and if one alternative requires a warning but the other does not. RELAX_DELAY_SLOT Like RELAX_NOMACRO, but indicates that the macro appears in a branch delay slot. RELAX_DELAY_SLOT_16BIT Like RELAX_DELAY_SLOT, but indicates that the delay slot requires a 16-bit instruction. RELAX_DELAY_SLOT_SIZE_FIRST Like RELAX_DELAY_SLOT, but indicates that the first implementation of the macro is of the wrong size for the branch delay slot. RELAX_DELAY_SLOT_SIZE_SECOND Like RELAX_DELAY_SLOT, but indicates that the second implementation of the macro is of the wrong size for the branch delay slot. The frag's "opcode" points to the first fixup for relaxable code. Relaxable macros are generated using a sequence such as: relax_start (SYMBOL); ... generate first expansion ... relax_switch (); ... generate second expansion ... relax_end (); The code and fixups for the unwanted alternative are discarded by md_convert_frag. */ #define RELAX_ENCODE(FIRST, SECOND) (((FIRST) << 8) | (SECOND)) #define RELAX_FIRST(X) (((X) >> 8) & 0xff) #define RELAX_SECOND(X) ((X) & 0xff) #define RELAX_USE_SECOND 0x10000 #define RELAX_SECOND_LONGER 0x20000 #define RELAX_NOMACRO 0x40000 #define RELAX_DELAY_SLOT 0x80000 #define RELAX_DELAY_SLOT_16BIT 0x100000 #define RELAX_DELAY_SLOT_SIZE_FIRST 0x200000 #define RELAX_DELAY_SLOT_SIZE_SECOND 0x400000 /* Branch without likely bit. If label is out of range, we turn: beq reg1, reg2, label delay slot into bne reg1, reg2, 0f nop j label 0: delay slot with the following opcode replacements: beq <-> bne blez <-> bgtz bltz <-> bgez bc1f <-> bc1t bltzal <-> bgezal (with jal label instead of j label) Even though keeping the delay slot instruction in the delay slot of the branch would be more efficient, it would be very tricky to do correctly, because we'd have to introduce a variable frag *after* the delay slot instruction, and expand that instead. Let's do it the easy way for now, even if the branch-not-taken case now costs one additional instruction. Out-of-range branches are not supposed to be common, anyway. Branch likely. If label is out of range, we turn: beql reg1, reg2, label delay slot (annulled if branch not taken) into beql reg1, reg2, 1f nop beql $0, $0, 2f nop 1: j[al] label delay slot (executed only if branch taken) 2: It would be possible to generate a shorter sequence by losing the likely bit, generating something like: bne reg1, reg2, 0f nop j[al] label delay slot (executed only if branch taken) 0: beql -> bne bnel -> beq blezl -> bgtz bgtzl -> blez bltzl -> bgez bgezl -> bltz bc1fl -> bc1t bc1tl -> bc1f bltzall -> bgezal (with jal label instead of j label) bgezall -> bltzal (ditto) but it's not clear that it would actually improve performance. */ #define RELAX_BRANCH_ENCODE(at, uncond, likely, link, toofar) \ ((relax_substateT) \ (0xc0000000 \ | ((at) & 0x1f) \ | ((toofar) ? 0x20 : 0) \ | ((link) ? 0x40 : 0) \ | ((likely) ? 0x80 : 0) \ | ((uncond) ? 0x100 : 0))) #define RELAX_BRANCH_P(i) (((i) & 0xf0000000) == 0xc0000000) #define RELAX_BRANCH_UNCOND(i) (((i) & 0x100) != 0) #define RELAX_BRANCH_LIKELY(i) (((i) & 0x80) != 0) #define RELAX_BRANCH_LINK(i) (((i) & 0x40) != 0) #define RELAX_BRANCH_TOOFAR(i) (((i) & 0x20) != 0) #define RELAX_BRANCH_AT(i) ((i) & 0x1f) /* For mips16 code, we use an entirely different form of relaxation. mips16 supports two versions of most instructions which take immediate values: a small one which takes some small value, and a larger one which takes a 16 bit value. Since branches also follow this pattern, relaxing these values is required. We can assemble both mips16 and normal MIPS code in a single object. Therefore, we need to support this type of relaxation at the same time that we support the relaxation described above. We use the high bit of the subtype field to distinguish these cases. The information we store for this type of relaxation is the argument code found in the opcode file for this relocation, whether the user explicitly requested a small or extended form, and whether the relocation is in a jump or jal delay slot. That tells us the size of the value, and how it should be stored. We also store whether the fragment is considered to be extended or not. We also store whether this is known to be a branch to a different section, whether we have tried to relax this frag yet, and whether we have ever extended a PC relative fragment because of a shift count. */ #define RELAX_MIPS16_ENCODE(type, small, ext, dslot, jal_dslot) \ (0x80000000 \ | ((type) & 0xff) \ | ((small) ? 0x100 : 0) \ | ((ext) ? 0x200 : 0) \ | ((dslot) ? 0x400 : 0) \ | ((jal_dslot) ? 0x800 : 0)) #define RELAX_MIPS16_P(i) (((i) & 0xc0000000) == 0x80000000) #define RELAX_MIPS16_TYPE(i) ((i) & 0xff) #define RELAX_MIPS16_USER_SMALL(i) (((i) & 0x100) != 0) #define RELAX_MIPS16_USER_EXT(i) (((i) & 0x200) != 0) #define RELAX_MIPS16_DSLOT(i) (((i) & 0x400) != 0) #define RELAX_MIPS16_JAL_DSLOT(i) (((i) & 0x800) != 0) #define RELAX_MIPS16_EXTENDED(i) (((i) & 0x1000) != 0) #define RELAX_MIPS16_MARK_EXTENDED(i) ((i) | 0x1000) #define RELAX_MIPS16_CLEAR_EXTENDED(i) ((i) &~ 0x1000) #define RELAX_MIPS16_LONG_BRANCH(i) (((i) & 0x2000) != 0) #define RELAX_MIPS16_MARK_LONG_BRANCH(i) ((i) | 0x2000) #define RELAX_MIPS16_CLEAR_LONG_BRANCH(i) ((i) &~ 0x2000) /* For microMIPS code, we use relaxation similar to one we use for MIPS16 code. Some instructions that take immediate values support two encodings: a small one which takes some small value, and a larger one which takes a 16 bit value. As some branches also follow this pattern, relaxing these values is required. We can assemble both microMIPS and normal MIPS code in a single object. Therefore, we need to support this type of relaxation at the same time that we support the relaxation described above. We use one of the high bits of the subtype field to distinguish these cases. The information we store for this type of relaxation is the argument code found in the opcode file for this relocation, the register selected as the assembler temporary, whether in the 32-bit instruction mode, whether the branch is unconditional, whether it is compact, whether there is no delay-slot instruction available to fill in, whether it stores the link address implicitly in $ra, whether relaxation of out-of-range 32-bit branches to a sequence of instructions is enabled, and whether the displacement of a branch is too large to fit as an immediate argument of a 16-bit and a 32-bit branch, respectively. */ #define RELAX_MICROMIPS_ENCODE(type, at, insn32, \ uncond, compact, link, nods, \ relax32, toofar16, toofar32) \ (0x40000000 \ | ((type) & 0xff) \ | (((at) & 0x1f) << 8) \ | ((insn32) ? 0x2000 : 0) \ | ((uncond) ? 0x4000 : 0) \ | ((compact) ? 0x8000 : 0) \ | ((link) ? 0x10000 : 0) \ | ((nods) ? 0x20000 : 0) \ | ((relax32) ? 0x40000 : 0) \ | ((toofar16) ? 0x80000 : 0) \ | ((toofar32) ? 0x100000 : 0)) #define RELAX_MICROMIPS_P(i) (((i) & 0xc0000000) == 0x40000000) #define RELAX_MICROMIPS_TYPE(i) ((i) & 0xff) #define RELAX_MICROMIPS_AT(i) (((i) >> 8) & 0x1f) #define RELAX_MICROMIPS_INSN32(i) (((i) & 0x2000) != 0) #define RELAX_MICROMIPS_UNCOND(i) (((i) & 0x4000) != 0) #define RELAX_MICROMIPS_COMPACT(i) (((i) & 0x8000) != 0) #define RELAX_MICROMIPS_LINK(i) (((i) & 0x10000) != 0) #define RELAX_MICROMIPS_NODS(i) (((i) & 0x20000) != 0) #define RELAX_MICROMIPS_RELAX32(i) (((i) & 0x40000) != 0) #define RELAX_MICROMIPS_TOOFAR16(i) (((i) & 0x80000) != 0) #define RELAX_MICROMIPS_MARK_TOOFAR16(i) ((i) | 0x80000) #define RELAX_MICROMIPS_CLEAR_TOOFAR16(i) ((i) & ~0x80000) #define RELAX_MICROMIPS_TOOFAR32(i) (((i) & 0x100000) != 0) #define RELAX_MICROMIPS_MARK_TOOFAR32(i) ((i) | 0x100000) #define RELAX_MICROMIPS_CLEAR_TOOFAR32(i) ((i) & ~0x100000) /* Sign-extend 16-bit value X. */ #define SEXT_16BIT(X) ((((X) + 0x8000) & 0xffff) - 0x8000) /* Is the given value a sign-extended 32-bit value? */ #define IS_SEXT_32BIT_NUM(x) \ (((x) &~ (offsetT) 0x7fffffff) == 0 \ || (((x) &~ (offsetT) 0x7fffffff) == ~ (offsetT) 0x7fffffff)) /* Is the given value a sign-extended 16-bit value? */ #define IS_SEXT_16BIT_NUM(x) \ (((x) &~ (offsetT) 0x7fff) == 0 \ || (((x) &~ (offsetT) 0x7fff) == ~ (offsetT) 0x7fff)) /* Is the given value a sign-extended 12-bit value? */ #define IS_SEXT_12BIT_NUM(x) \ (((((x) & 0xfff) ^ 0x800LL) - 0x800LL) == (x)) /* Is the given value a sign-extended 9-bit value? */ #define IS_SEXT_9BIT_NUM(x) \ (((((x) & 0x1ff) ^ 0x100LL) - 0x100LL) == (x)) /* Is the given value a zero-extended 32-bit value? Or a negated one? */ #define IS_ZEXT_32BIT_NUM(x) \ (((x) &~ (offsetT) 0xffffffff) == 0 \ || (((x) &~ (offsetT) 0xffffffff) == ~ (offsetT) 0xffffffff)) /* Extract bits MASK << SHIFT from STRUCT and shift them right SHIFT places. */ #define EXTRACT_BITS(STRUCT, MASK, SHIFT) \ (((STRUCT) >> (SHIFT)) & (MASK)) /* Extract the operand given by FIELD from mips_cl_insn INSN. */ #define EXTRACT_OPERAND(MICROMIPS, FIELD, INSN) \ (!(MICROMIPS) \ ? EXTRACT_BITS ((INSN).insn_opcode, OP_MASK_##FIELD, OP_SH_##FIELD) \ : EXTRACT_BITS ((INSN).insn_opcode, \ MICROMIPSOP_MASK_##FIELD, MICROMIPSOP_SH_##FIELD)) #define MIPS16_EXTRACT_OPERAND(FIELD, INSN) \ EXTRACT_BITS ((INSN).insn_opcode, \ MIPS16OP_MASK_##FIELD, \ MIPS16OP_SH_##FIELD) /* The MIPS16 EXTEND opcode, shifted left 16 places. */ #define MIPS16_EXTEND (0xf000U << 16) /* Whether or not we are emitting a branch-likely macro. */ static bfd_boolean emit_branch_likely_macro = FALSE; /* Global variables used when generating relaxable macros. See the comment above RELAX_ENCODE for more details about how relaxation is used. */ static struct { /* 0 if we're not emitting a relaxable macro. 1 if we're emitting the first of the two relaxation alternatives. 2 if we're emitting the second alternative. */ int sequence; /* The first relaxable fixup in the current frag. (In other words, the first fixup that refers to relaxable code.) */ fixS *first_fixup; /* sizes[0] says how many bytes of the first alternative are stored in the current frag. Likewise sizes[1] for the second alternative. */ unsigned int sizes[2]; /* The symbol on which the choice of sequence depends. */ symbolS *symbol; } mips_relax; /* Global variables used to decide whether a macro needs a warning. */ static struct { /* True if the macro is in a branch delay slot. */ bfd_boolean delay_slot_p; /* Set to the length in bytes required if the macro is in a delay slot that requires a specific length of instruction, otherwise zero. */ unsigned int delay_slot_length; /* For relaxable macros, sizes[0] is the length of the first alternative in bytes and sizes[1] is the length of the second alternative. For non-relaxable macros, both elements give the length of the macro in bytes. */ unsigned int sizes[2]; /* For relaxable macros, first_insn_sizes[0] is the length of the first instruction of the first alternative in bytes and first_insn_sizes[1] is the length of the first instruction of the second alternative. For non-relaxable macros, both elements give the length of the first instruction in bytes. Set to zero if we haven't yet seen the first instruction. */ unsigned int first_insn_sizes[2]; /* For relaxable macros, insns[0] is the number of instructions for the first alternative and insns[1] is the number of instructions for the second alternative. For non-relaxable macros, both elements give the number of instructions for the macro. */ unsigned int insns[2]; /* The first variant frag for this macro. */ fragS *first_frag; } mips_macro_warning; /* Prototypes for static functions. */ enum mips_regclass { MIPS_GR_REG, MIPS_FP_REG, MIPS16_REG }; static void append_insn (struct mips_cl_insn *, expressionS *, bfd_reloc_code_real_type *, bfd_boolean expansionp); static void mips_no_prev_insn (void); static void macro_build (expressionS *, const char *, const char *, ...); static void mips16_macro_build (expressionS *, const char *, const char *, va_list *); static void load_register (int, expressionS *, int); static void macro_start (void); static void macro_end (void); static void macro (struct mips_cl_insn *ip, char *str); static void mips16_macro (struct mips_cl_insn * ip); static void mips_ip (char *str, struct mips_cl_insn * ip); static void mips16_ip (char *str, struct mips_cl_insn * ip); static void mips16_immed (const char *, unsigned int, int, bfd_reloc_code_real_type, offsetT, unsigned int, unsigned long *); static size_t my_getSmallExpression (expressionS *, bfd_reloc_code_real_type *, char *); static void my_getExpression (expressionS *, char *); static void s_align (int); static void s_change_sec (int); static void s_change_section (int); static void s_cons (int); static void s_float_cons (int); static void s_mips_globl (int); static void s_option (int); static void s_mipsset (int); static void s_abicalls (int); static void s_cpload (int); static void s_cpsetup (int); static void s_cplocal (int); static void s_cprestore (int); static void s_cpreturn (int); static void s_dtprelword (int); static void s_dtpreldword (int); static void s_tprelword (int); static void s_tpreldword (int); static void s_gpvalue (int); static void s_gpword (int); static void s_gpdword (int); static void s_ehword (int); static void s_cpadd (int); static void s_insn (int); static void s_nan (int); static void s_module (int); static void s_mips_ent (int); static void s_mips_end (int); static void s_mips_frame (int); static void s_mips_mask (int reg_type); static void s_mips_stab (int); static void s_mips_weakext (int); static void s_mips_file (int); static void s_mips_loc (int); static bfd_boolean pic_need_relax (symbolS *, asection *); static int relaxed_branch_length (fragS *, asection *, int); static int relaxed_micromips_16bit_branch_length (fragS *, asection *, int); static int relaxed_micromips_32bit_branch_length (fragS *, asection *, int); static void file_mips_check_options (void); /* Table and functions used to map between CPU/ISA names, and ISA levels, and CPU numbers. */ struct mips_cpu_info { const char *name; /* CPU or ISA name. */ int flags; /* MIPS_CPU_* flags. */ int ase; /* Set of ASEs implemented by the CPU. */ int isa; /* ISA level. */ int cpu; /* CPU number (default CPU if ISA). */ }; #define MIPS_CPU_IS_ISA 0x0001 /* Is this an ISA? (If 0, a CPU.) */ static const struct mips_cpu_info *mips_parse_cpu (const char *, const char *); static const struct mips_cpu_info *mips_cpu_info_from_isa (int); static const struct mips_cpu_info *mips_cpu_info_from_arch (int); /* Command-line options. */ const char *md_shortopts = "O::g::G:"; enum options { OPTION_MARCH = OPTION_MD_BASE, OPTION_MTUNE, OPTION_MIPS1, OPTION_MIPS2, OPTION_MIPS3, OPTION_MIPS4, OPTION_MIPS5, OPTION_MIPS32, OPTION_MIPS64, OPTION_MIPS32R2, OPTION_MIPS32R3, OPTION_MIPS32R5, OPTION_MIPS32R6, OPTION_MIPS64R2, OPTION_MIPS64R3, OPTION_MIPS64R5, OPTION_MIPS64R6, OPTION_MIPS16, OPTION_NO_MIPS16, OPTION_MIPS3D, OPTION_NO_MIPS3D, OPTION_MDMX, OPTION_NO_MDMX, OPTION_DSP, OPTION_NO_DSP, OPTION_MT, OPTION_NO_MT, OPTION_VIRT, OPTION_NO_VIRT, OPTION_MSA, OPTION_NO_MSA, OPTION_SMARTMIPS, OPTION_NO_SMARTMIPS, OPTION_DSPR2, OPTION_NO_DSPR2, OPTION_DSPR3, OPTION_NO_DSPR3, OPTION_EVA, OPTION_NO_EVA, OPTION_XPA, OPTION_NO_XPA, OPTION_MICROMIPS, OPTION_NO_MICROMIPS, OPTION_MCU, OPTION_NO_MCU, OPTION_COMPAT_ARCH_BASE, OPTION_M4650, OPTION_NO_M4650, OPTION_M4010, OPTION_NO_M4010, OPTION_M4100, OPTION_NO_M4100, OPTION_M3900, OPTION_NO_M3900, OPTION_M7000_HILO_FIX, OPTION_MNO_7000_HILO_FIX, OPTION_FIX_24K, OPTION_NO_FIX_24K, OPTION_FIX_RM7000, OPTION_NO_FIX_RM7000, OPTION_FIX_LOONGSON2F_JUMP, OPTION_NO_FIX_LOONGSON2F_JUMP, OPTION_FIX_LOONGSON2F_NOP, OPTION_NO_FIX_LOONGSON2F_NOP, OPTION_FIX_VR4120, OPTION_NO_FIX_VR4120, OPTION_FIX_VR4130, OPTION_NO_FIX_VR4130, OPTION_FIX_CN63XXP1, OPTION_NO_FIX_CN63XXP1, OPTION_TRAP, OPTION_BREAK, OPTION_EB, OPTION_EL, OPTION_FP32, OPTION_GP32, OPTION_CONSTRUCT_FLOATS, OPTION_NO_CONSTRUCT_FLOATS, OPTION_FP64, OPTION_FPXX, OPTION_GP64, OPTION_RELAX_BRANCH, OPTION_NO_RELAX_BRANCH, OPTION_INSN32, OPTION_NO_INSN32, OPTION_MSHARED, OPTION_MNO_SHARED, OPTION_MSYM32, OPTION_MNO_SYM32, OPTION_SOFT_FLOAT, OPTION_HARD_FLOAT, OPTION_SINGLE_FLOAT, OPTION_DOUBLE_FLOAT, OPTION_32, OPTION_CALL_SHARED, OPTION_CALL_NONPIC, OPTION_NON_SHARED, OPTION_XGOT, OPTION_MABI, OPTION_N32, OPTION_64, OPTION_MDEBUG, OPTION_NO_MDEBUG, OPTION_PDR, OPTION_NO_PDR, OPTION_MVXWORKS_PIC, OPTION_NAN, OPTION_ODD_SPREG, OPTION_NO_ODD_SPREG, OPTION_END_OF_ENUM }; struct option md_longopts[] = { /* Options which specify architecture. */ {"march", required_argument, NULL, OPTION_MARCH}, {"mtune", required_argument, NULL, OPTION_MTUNE}, {"mips0", no_argument, NULL, OPTION_MIPS1}, {"mips1", no_argument, NULL, OPTION_MIPS1}, {"mips2", no_argument, NULL, OPTION_MIPS2}, {"mips3", no_argument, NULL, OPTION_MIPS3}, {"mips4", no_argument, NULL, OPTION_MIPS4}, {"mips5", no_argument, NULL, OPTION_MIPS5}, {"mips32", no_argument, NULL, OPTION_MIPS32}, {"mips64", no_argument, NULL, OPTION_MIPS64}, {"mips32r2", no_argument, NULL, OPTION_MIPS32R2}, {"mips32r3", no_argument, NULL, OPTION_MIPS32R3}, {"mips32r5", no_argument, NULL, OPTION_MIPS32R5}, {"mips32r6", no_argument, NULL, OPTION_MIPS32R6}, {"mips64r2", no_argument, NULL, OPTION_MIPS64R2}, {"mips64r3", no_argument, NULL, OPTION_MIPS64R3}, {"mips64r5", no_argument, NULL, OPTION_MIPS64R5}, {"mips64r6", no_argument, NULL, OPTION_MIPS64R6}, /* Options which specify Application Specific Extensions (ASEs). */ {"mips16", no_argument, NULL, OPTION_MIPS16}, {"no-mips16", no_argument, NULL, OPTION_NO_MIPS16}, {"mips3d", no_argument, NULL, OPTION_MIPS3D}, {"no-mips3d", no_argument, NULL, OPTION_NO_MIPS3D}, {"mdmx", no_argument, NULL, OPTION_MDMX}, {"no-mdmx", no_argument, NULL, OPTION_NO_MDMX}, {"mdsp", no_argument, NULL, OPTION_DSP}, {"mno-dsp", no_argument, NULL, OPTION_NO_DSP}, {"mmt", no_argument, NULL, OPTION_MT}, {"mno-mt", no_argument, NULL, OPTION_NO_MT}, {"msmartmips", no_argument, NULL, OPTION_SMARTMIPS}, {"mno-smartmips", no_argument, NULL, OPTION_NO_SMARTMIPS}, {"mdspr2", no_argument, NULL, OPTION_DSPR2}, {"mno-dspr2", no_argument, NULL, OPTION_NO_DSPR2}, {"mdspr3", no_argument, NULL, OPTION_DSPR3}, {"mno-dspr3", no_argument, NULL, OPTION_NO_DSPR3}, {"meva", no_argument, NULL, OPTION_EVA}, {"mno-eva", no_argument, NULL, OPTION_NO_EVA}, {"mmicromips", no_argument, NULL, OPTION_MICROMIPS}, {"mno-micromips", no_argument, NULL, OPTION_NO_MICROMIPS}, {"mmcu", no_argument, NULL, OPTION_MCU}, {"mno-mcu", no_argument, NULL, OPTION_NO_MCU}, {"mvirt", no_argument, NULL, OPTION_VIRT}, {"mno-virt", no_argument, NULL, OPTION_NO_VIRT}, {"mmsa", no_argument, NULL, OPTION_MSA}, {"mno-msa", no_argument, NULL, OPTION_NO_MSA}, {"mxpa", no_argument, NULL, OPTION_XPA}, {"mno-xpa", no_argument, NULL, OPTION_NO_XPA}, /* Old-style architecture options. Don't add more of these. */ {"m4650", no_argument, NULL, OPTION_M4650}, {"no-m4650", no_argument, NULL, OPTION_NO_M4650}, {"m4010", no_argument, NULL, OPTION_M4010}, {"no-m4010", no_argument, NULL, OPTION_NO_M4010}, {"m4100", no_argument, NULL, OPTION_M4100}, {"no-m4100", no_argument, NULL, OPTION_NO_M4100}, {"m3900", no_argument, NULL, OPTION_M3900}, {"no-m3900", no_argument, NULL, OPTION_NO_M3900}, /* Options which enable bug fixes. */ {"mfix7000", no_argument, NULL, OPTION_M7000_HILO_FIX}, {"no-fix-7000", no_argument, NULL, OPTION_MNO_7000_HILO_FIX}, {"mno-fix7000", no_argument, NULL, OPTION_MNO_7000_HILO_FIX}, {"mfix-loongson2f-jump", no_argument, NULL, OPTION_FIX_LOONGSON2F_JUMP}, {"mno-fix-loongson2f-jump", no_argument, NULL, OPTION_NO_FIX_LOONGSON2F_JUMP}, {"mfix-loongson2f-nop", no_argument, NULL, OPTION_FIX_LOONGSON2F_NOP}, {"mno-fix-loongson2f-nop", no_argument, NULL, OPTION_NO_FIX_LOONGSON2F_NOP}, {"mfix-vr4120", no_argument, NULL, OPTION_FIX_VR4120}, {"mno-fix-vr4120", no_argument, NULL, OPTION_NO_FIX_VR4120}, {"mfix-vr4130", no_argument, NULL, OPTION_FIX_VR4130}, {"mno-fix-vr4130", no_argument, NULL, OPTION_NO_FIX_VR4130}, {"mfix-24k", no_argument, NULL, OPTION_FIX_24K}, {"mno-fix-24k", no_argument, NULL, OPTION_NO_FIX_24K}, {"mfix-rm7000", no_argument, NULL, OPTION_FIX_RM7000}, {"mno-fix-rm7000", no_argument, NULL, OPTION_NO_FIX_RM7000}, {"mfix-cn63xxp1", no_argument, NULL, OPTION_FIX_CN63XXP1}, {"mno-fix-cn63xxp1", no_argument, NULL, OPTION_NO_FIX_CN63XXP1}, /* Miscellaneous options. */ {"trap", no_argument, NULL, OPTION_TRAP}, {"no-break", no_argument, NULL, OPTION_TRAP}, {"break", no_argument, NULL, OPTION_BREAK}, {"no-trap", no_argument, NULL, OPTION_BREAK}, {"EB", no_argument, NULL, OPTION_EB}, {"EL", no_argument, NULL, OPTION_EL}, {"mfp32", no_argument, NULL, OPTION_FP32}, {"mgp32", no_argument, NULL, OPTION_GP32}, {"construct-floats", no_argument, NULL, OPTION_CONSTRUCT_FLOATS}, {"no-construct-floats", no_argument, NULL, OPTION_NO_CONSTRUCT_FLOATS}, {"mfp64", no_argument, NULL, OPTION_FP64}, {"mfpxx", no_argument, NULL, OPTION_FPXX}, {"mgp64", no_argument, NULL, OPTION_GP64}, {"relax-branch", no_argument, NULL, OPTION_RELAX_BRANCH}, {"no-relax-branch", no_argument, NULL, OPTION_NO_RELAX_BRANCH}, {"minsn32", no_argument, NULL, OPTION_INSN32}, {"mno-insn32", no_argument, NULL, OPTION_NO_INSN32}, {"mshared", no_argument, NULL, OPTION_MSHARED}, {"mno-shared", no_argument, NULL, OPTION_MNO_SHARED}, {"msym32", no_argument, NULL, OPTION_MSYM32}, {"mno-sym32", no_argument, NULL, OPTION_MNO_SYM32}, {"msoft-float", no_argument, NULL, OPTION_SOFT_FLOAT}, {"mhard-float", no_argument, NULL, OPTION_HARD_FLOAT}, {"msingle-float", no_argument, NULL, OPTION_SINGLE_FLOAT}, {"mdouble-float", no_argument, NULL, OPTION_DOUBLE_FLOAT}, {"modd-spreg", no_argument, NULL, OPTION_ODD_SPREG}, {"mno-odd-spreg", no_argument, NULL, OPTION_NO_ODD_SPREG}, /* Strictly speaking this next option is ELF specific, but we allow it for other ports as well in order to make testing easier. */ {"32", no_argument, NULL, OPTION_32}, /* ELF-specific options. */ {"KPIC", no_argument, NULL, OPTION_CALL_SHARED}, {"call_shared", no_argument, NULL, OPTION_CALL_SHARED}, {"call_nonpic", no_argument, NULL, OPTION_CALL_NONPIC}, {"non_shared", no_argument, NULL, OPTION_NON_SHARED}, {"xgot", no_argument, NULL, OPTION_XGOT}, {"mabi", required_argument, NULL, OPTION_MABI}, {"n32", no_argument, NULL, OPTION_N32}, {"64", no_argument, NULL, OPTION_64}, {"mdebug", no_argument, NULL, OPTION_MDEBUG}, {"no-mdebug", no_argument, NULL, OPTION_NO_MDEBUG}, {"mpdr", no_argument, NULL, OPTION_PDR}, {"mno-pdr", no_argument, NULL, OPTION_NO_PDR}, {"mvxworks-pic", no_argument, NULL, OPTION_MVXWORKS_PIC}, {"mnan", required_argument, NULL, OPTION_NAN}, {NULL, no_argument, NULL, 0} }; size_t md_longopts_size = sizeof (md_longopts); /* Information about either an Application Specific Extension or an optional architecture feature that, for simplicity, we treat in the same way as an ASE. */ struct mips_ase { /* The name of the ASE, used in both the command-line and .set options. */ const char *name; /* The associated ASE_* flags. If the ASE is available on both 32-bit and 64-bit architectures, the flags here refer to the subset that is available on both. */ unsigned int flags; /* The ASE_* flag used for instructions that are available on 64-bit architectures but that are not included in FLAGS. */ unsigned int flags64; /* The command-line options that turn the ASE on and off. */ int option_on; int option_off; /* The minimum required architecture revisions for MIPS32, MIPS64, microMIPS32 and microMIPS64, or -1 if the extension isn't supported. */ int mips32_rev; int mips64_rev; int micromips32_rev; int micromips64_rev; /* The architecture where the ASE was removed or -1 if the extension has not been removed. */ int rem_rev; }; /* A table of all supported ASEs. */ static const struct mips_ase mips_ases[] = { { "dsp", ASE_DSP, ASE_DSP64, OPTION_DSP, OPTION_NO_DSP, 2, 2, 2, 2, -1 }, { "dspr2", ASE_DSP | ASE_DSPR2, 0, OPTION_DSPR2, OPTION_NO_DSPR2, 2, 2, 2, 2, -1 }, { "dspr3", ASE_DSP | ASE_DSPR2 | ASE_DSPR3, 0, OPTION_DSPR3, OPTION_NO_DSPR3, 6, 6, -1, -1, -1 }, { "eva", ASE_EVA, 0, OPTION_EVA, OPTION_NO_EVA, 2, 2, 2, 2, -1 }, { "mcu", ASE_MCU, 0, OPTION_MCU, OPTION_NO_MCU, 2, 2, 2, 2, -1 }, /* Deprecated in MIPS64r5, but we don't implement that yet. */ { "mdmx", ASE_MDMX, 0, OPTION_MDMX, OPTION_NO_MDMX, -1, 1, -1, -1, 6 }, /* Requires 64-bit FPRs, so the minimum MIPS32 revision is 2. */ { "mips3d", ASE_MIPS3D, 0, OPTION_MIPS3D, OPTION_NO_MIPS3D, 2, 1, -1, -1, 6 }, { "mt", ASE_MT, 0, OPTION_MT, OPTION_NO_MT, 2, 2, -1, -1, -1 }, { "smartmips", ASE_SMARTMIPS, 0, OPTION_SMARTMIPS, OPTION_NO_SMARTMIPS, 1, -1, -1, -1, 6 }, { "virt", ASE_VIRT, ASE_VIRT64, OPTION_VIRT, OPTION_NO_VIRT, 2, 2, 2, 2, -1 }, { "msa", ASE_MSA, ASE_MSA64, OPTION_MSA, OPTION_NO_MSA, 2, 2, 2, 2, -1 }, { "xpa", ASE_XPA, 0, OPTION_XPA, OPTION_NO_XPA, 2, 2, -1, -1, -1 }, }; /* The set of ASEs that require -mfp64. */ #define FP64_ASES (ASE_MIPS3D | ASE_MDMX | ASE_MSA) /* Groups of ASE_* flags that represent different revisions of an ASE. */ static const unsigned int mips_ase_groups[] = { ASE_DSP | ASE_DSPR2 | ASE_DSPR3 }; /* Pseudo-op table. The following pseudo-ops from the Kane and Heinrich MIPS book should be defined here, but are currently unsupported: .alias, .galive, .gjaldef, .gjrlive, .livereg, .noalias. The following pseudo-ops from the Kane and Heinrich MIPS book are specific to the type of debugging information being generated, and should be defined by the object format: .aent, .begin, .bend, .bgnb, .end, .endb, .ent, .fmask, .frame, .loc, .mask, .verstamp, .vreg. The following pseudo-ops from the Kane and Heinrich MIPS book are not MIPS CPU specific, but are also not specific to the object file format. This file is probably the best place to define them, but they are not currently supported: .asm0, .endr, .lab, .struct. */ static const pseudo_typeS mips_pseudo_table[] = { /* MIPS specific pseudo-ops. */ {"option", s_option, 0}, {"set", s_mipsset, 0}, {"rdata", s_change_sec, 'r'}, {"sdata", s_change_sec, 's'}, {"livereg", s_ignore, 0}, {"abicalls", s_abicalls, 0}, {"cpload", s_cpload, 0}, {"cpsetup", s_cpsetup, 0}, {"cplocal", s_cplocal, 0}, {"cprestore", s_cprestore, 0}, {"cpreturn", s_cpreturn, 0}, {"dtprelword", s_dtprelword, 0}, {"dtpreldword", s_dtpreldword, 0}, {"tprelword", s_tprelword, 0}, {"tpreldword", s_tpreldword, 0}, {"gpvalue", s_gpvalue, 0}, {"gpword", s_gpword, 0}, {"gpdword", s_gpdword, 0}, {"ehword", s_ehword, 0}, {"cpadd", s_cpadd, 0}, {"insn", s_insn, 0}, {"nan", s_nan, 0}, {"module", s_module, 0}, /* Relatively generic pseudo-ops that happen to be used on MIPS chips. */ {"asciiz", stringer, 8 + 1}, {"bss", s_change_sec, 'b'}, {"err", s_err, 0}, {"half", s_cons, 1}, {"dword", s_cons, 3}, {"weakext", s_mips_weakext, 0}, {"origin", s_org, 0}, {"repeat", s_rept, 0}, /* For MIPS this is non-standard, but we define it for consistency. */ {"sbss", s_change_sec, 'B'}, /* These pseudo-ops are defined in read.c, but must be overridden here for one reason or another. */ {"align", s_align, 0}, {"byte", s_cons, 0}, {"data", s_change_sec, 'd'}, {"double", s_float_cons, 'd'}, {"float", s_float_cons, 'f'}, {"globl", s_mips_globl, 0}, {"global", s_mips_globl, 0}, {"hword", s_cons, 1}, {"int", s_cons, 2}, {"long", s_cons, 2}, {"octa", s_cons, 4}, {"quad", s_cons, 3}, {"section", s_change_section, 0}, {"short", s_cons, 1}, {"single", s_float_cons, 'f'}, {"stabd", s_mips_stab, 'd'}, {"stabn", s_mips_stab, 'n'}, {"stabs", s_mips_stab, 's'}, {"text", s_change_sec, 't'}, {"word", s_cons, 2}, { "extern", ecoff_directive_extern, 0}, { NULL, NULL, 0 }, }; static const pseudo_typeS mips_nonecoff_pseudo_table[] = { /* These pseudo-ops should be defined by the object file format. However, a.out doesn't support them, so we have versions here. */ {"aent", s_mips_ent, 1}, {"bgnb", s_ignore, 0}, {"end", s_mips_end, 0}, {"endb", s_ignore, 0}, {"ent", s_mips_ent, 0}, {"file", s_mips_file, 0}, {"fmask", s_mips_mask, 'F'}, {"frame", s_mips_frame, 0}, {"loc", s_mips_loc, 0}, {"mask", s_mips_mask, 'R'}, {"verstamp", s_ignore, 0}, { NULL, NULL, 0 }, }; /* Export the ABI address size for use by TC_ADDRESS_BYTES for the purpose of the `.dc.a' internal pseudo-op. */ int mips_address_bytes (void) { file_mips_check_options (); return HAVE_64BIT_ADDRESSES ? 8 : 4; } extern void pop_insert (const pseudo_typeS *); void mips_pop_insert (void) { pop_insert (mips_pseudo_table); if (! ECOFF_DEBUGGING) pop_insert (mips_nonecoff_pseudo_table); } /* Symbols labelling the current insn. */ struct insn_label_list { struct insn_label_list *next; symbolS *label; }; static struct insn_label_list *free_insn_labels; #define label_list tc_segment_info_data.labels static void mips_clear_insn_labels (void); static void mips_mark_labels (void); static void mips_compressed_mark_labels (void); static inline void mips_clear_insn_labels (void) { struct insn_label_list **pl; segment_info_type *si; if (now_seg) { for (pl = &free_insn_labels; *pl != NULL; pl = &(*pl)->next) ; si = seg_info (now_seg); *pl = si->label_list; si->label_list = NULL; } } /* Mark instruction labels in MIPS16/microMIPS mode. */ static inline void mips_mark_labels (void) { if (HAVE_CODE_COMPRESSION) mips_compressed_mark_labels (); } static char *expr_end; /* An expression in a macro instruction. This is set by mips_ip and mips16_ip and when populated is always an O_constant. */ static expressionS imm_expr; /* The relocatable field in an instruction and the relocs associated with it. These variables are used for instructions like LUI and JAL as well as true offsets. They are also used for address operands in macros. */ static expressionS offset_expr; static bfd_reloc_code_real_type offset_reloc[3] = {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED}; /* This is set to the resulting size of the instruction to be produced by mips16_ip if an explicit extension is used or by mips_ip if an explicit size is supplied. */ static unsigned int forced_insn_length; /* True if we are assembling an instruction. All dot symbols defined during this time should be treated as code labels. */ static bfd_boolean mips_assembling_insn; /* The pdr segment for per procedure frame/regmask info. Not used for ECOFF debugging. */ static segT pdr_seg; /* The default target format to use. */ #if defined (TE_FreeBSD) #define ELF_TARGET(PREFIX, ENDIAN) PREFIX "trad" ENDIAN "mips-freebsd" #elif defined (TE_TMIPS) #define ELF_TARGET(PREFIX, ENDIAN) PREFIX "trad" ENDIAN "mips" #else #define ELF_TARGET(PREFIX, ENDIAN) PREFIX ENDIAN "mips" #endif const char * mips_target_format (void) { switch (OUTPUT_FLAVOR) { case bfd_target_elf_flavour: #ifdef TE_VXWORKS if (!HAVE_64BIT_OBJECTS && !HAVE_NEWABI) return (target_big_endian ? "elf32-bigmips-vxworks" : "elf32-littlemips-vxworks"); #endif return (target_big_endian ? (HAVE_64BIT_OBJECTS ? ELF_TARGET ("elf64-", "big") : (HAVE_NEWABI ? ELF_TARGET ("elf32-n", "big") : ELF_TARGET ("elf32-", "big"))) : (HAVE_64BIT_OBJECTS ? ELF_TARGET ("elf64-", "little") : (HAVE_NEWABI ? ELF_TARGET ("elf32-n", "little") : ELF_TARGET ("elf32-", "little")))); default: abort (); return NULL; } } /* Return the ISA revision that is currently in use, or 0 if we are generating code for MIPS V or below. */ static int mips_isa_rev (void) { if (mips_opts.isa == ISA_MIPS32R2 || mips_opts.isa == ISA_MIPS64R2) return 2; if (mips_opts.isa == ISA_MIPS32R3 || mips_opts.isa == ISA_MIPS64R3) return 3; if (mips_opts.isa == ISA_MIPS32R5 || mips_opts.isa == ISA_MIPS64R5) return 5; if (mips_opts.isa == ISA_MIPS32R6 || mips_opts.isa == ISA_MIPS64R6) return 6; /* microMIPS implies revision 2 or above. */ if (mips_opts.micromips) return 2; if (mips_opts.isa == ISA_MIPS32 || mips_opts.isa == ISA_MIPS64) return 1; return 0; } /* Return the mask of all ASEs that are revisions of those in FLAGS. */ static unsigned int mips_ase_mask (unsigned int flags) { unsigned int i; for (i = 0; i < ARRAY_SIZE (mips_ase_groups); i++) if (flags & mips_ase_groups[i]) flags |= mips_ase_groups[i]; return flags; } /* Check whether the current ISA supports ASE. Issue a warning if appropriate. */ static void mips_check_isa_supports_ase (const struct mips_ase *ase) { const char *base; int min_rev, size; static unsigned int warned_isa; static unsigned int warned_fp32; if (ISA_HAS_64BIT_REGS (mips_opts.isa)) min_rev = mips_opts.micromips ? ase->micromips64_rev : ase->mips64_rev; else min_rev = mips_opts.micromips ? ase->micromips32_rev : ase->mips32_rev; if ((min_rev < 0 || mips_isa_rev () < min_rev) && (warned_isa & ase->flags) != ase->flags) { warned_isa |= ase->flags; base = mips_opts.micromips ? "microMIPS" : "MIPS"; size = ISA_HAS_64BIT_REGS (mips_opts.isa) ? 64 : 32; if (min_rev < 0) as_warn (_("the %d-bit %s architecture does not support the" " `%s' extension"), size, base, ase->name); else as_warn (_("the `%s' extension requires %s%d revision %d or greater"), ase->name, base, size, min_rev); } else if ((ase->rem_rev > 0 && mips_isa_rev () >= ase->rem_rev) && (warned_isa & ase->flags) != ase->flags) { warned_isa |= ase->flags; base = mips_opts.micromips ? "microMIPS" : "MIPS"; size = ISA_HAS_64BIT_REGS (mips_opts.isa) ? 64 : 32; as_warn (_("the `%s' extension was removed in %s%d revision %d"), ase->name, base, size, ase->rem_rev); } if ((ase->flags & FP64_ASES) && mips_opts.fp != 64 && (warned_fp32 & ase->flags) != ase->flags) { warned_fp32 |= ase->flags; as_warn (_("the `%s' extension requires 64-bit FPRs"), ase->name); } } /* Check all enabled ASEs to see whether they are supported by the chosen architecture. */ static void mips_check_isa_supports_ases (void) { unsigned int i, mask; for (i = 0; i < ARRAY_SIZE (mips_ases); i++) { mask = mips_ase_mask (mips_ases[i].flags); if ((mips_opts.ase & mask) == mips_ases[i].flags) mips_check_isa_supports_ase (&mips_ases[i]); } } /* Set the state of ASE to ENABLED_P. Return the mask of ASE_* flags that were affected. */ static unsigned int mips_set_ase (const struct mips_ase *ase, struct mips_set_options *opts, bfd_boolean enabled_p) { unsigned int mask; mask = mips_ase_mask (ase->flags); opts->ase &= ~mask; if (enabled_p) opts->ase |= ase->flags; return mask; } /* Return the ASE called NAME, or null if none. */ static const struct mips_ase * mips_lookup_ase (const char *name) { unsigned int i; for (i = 0; i < ARRAY_SIZE (mips_ases); i++) if (strcmp (name, mips_ases[i].name) == 0) return &mips_ases[i]; return NULL; } /* Return the length of a microMIPS instruction in bytes. If bits of the mask beyond the low 16 are 0, then it is a 16-bit instruction, otherwise it is a 32-bit instruction. */ static inline unsigned int micromips_insn_length (const struct mips_opcode *mo) { return mips_opcode_32bit_p (mo) ? 4 : 2; } /* Return the length of MIPS16 instruction OPCODE. */ static inline unsigned int mips16_opcode_length (unsigned long opcode) { return (opcode >> 16) == 0 ? 2 : 4; } /* Return the length of instruction INSN. */ static inline unsigned int insn_length (const struct mips_cl_insn *insn) { if (mips_opts.micromips) return micromips_insn_length (insn->insn_mo); else if (mips_opts.mips16) return mips16_opcode_length (insn->insn_opcode); else return 4; } /* Initialise INSN from opcode entry MO. Leave its position unspecified. */ static void create_insn (struct mips_cl_insn *insn, const struct mips_opcode *mo) { size_t i; insn->insn_mo = mo; insn->insn_opcode = mo->match; insn->frag = NULL; insn->where = 0; for (i = 0; i < ARRAY_SIZE (insn->fixp); i++) insn->fixp[i] = NULL; insn->fixed_p = (mips_opts.noreorder > 0); insn->noreorder_p = (mips_opts.noreorder > 0); insn->mips16_absolute_jump_p = 0; insn->complete_p = 0; insn->cleared_p = 0; } /* Get a list of all the operands in INSN. */ static const struct mips_operand_array * insn_operands (const struct mips_cl_insn *insn) { if (insn->insn_mo >= &mips_opcodes[0] && insn->insn_mo < &mips_opcodes[NUMOPCODES]) return &mips_operands[insn->insn_mo - &mips_opcodes[0]]; if (insn->insn_mo >= &mips16_opcodes[0] && insn->insn_mo < &mips16_opcodes[bfd_mips16_num_opcodes]) return &mips16_operands[insn->insn_mo - &mips16_opcodes[0]]; if (insn->insn_mo >= &micromips_opcodes[0] && insn->insn_mo < &micromips_opcodes[bfd_micromips_num_opcodes]) return &micromips_operands[insn->insn_mo - &micromips_opcodes[0]]; abort (); } /* Get a description of operand OPNO of INSN. */ static const struct mips_operand * insn_opno (const struct mips_cl_insn *insn, unsigned opno) { const struct mips_operand_array *operands; operands = insn_operands (insn); if (opno >= MAX_OPERANDS || !operands->operand[opno]) abort (); return operands->operand[opno]; } /* Install UVAL as the value of OPERAND in INSN. */ static inline void insn_insert_operand (struct mips_cl_insn *insn, const struct mips_operand *operand, unsigned int uval) { insn->insn_opcode = mips_insert_operand (operand, insn->insn_opcode, uval); } /* Extract the value of OPERAND from INSN. */ static inline unsigned insn_extract_operand (const struct mips_cl_insn *insn, const struct mips_operand *operand) { return mips_extract_operand (operand, insn->insn_opcode); } /* Record the current MIPS16/microMIPS mode in now_seg. */ static void mips_record_compressed_mode (void) { segment_info_type *si; si = seg_info (now_seg); if (si->tc_segment_info_data.mips16 != mips_opts.mips16) si->tc_segment_info_data.mips16 = mips_opts.mips16; if (si->tc_segment_info_data.micromips != mips_opts.micromips) si->tc_segment_info_data.micromips = mips_opts.micromips; } /* Read a standard MIPS instruction from BUF. */ static unsigned long read_insn (char *buf) { if (target_big_endian) return bfd_getb32 ((bfd_byte *) buf); else return bfd_getl32 ((bfd_byte *) buf); } /* Write standard MIPS instruction INSN to BUF. Return a pointer to the next byte. */ static char * write_insn (char *buf, unsigned int insn) { md_number_to_chars (buf, insn, 4); return buf + 4; } /* Read a microMIPS or MIPS16 opcode from BUF, given that it has length LENGTH. */ static unsigned long read_compressed_insn (char *buf, unsigned int length) { unsigned long insn; unsigned int i; insn = 0; for (i = 0; i < length; i += 2) { insn <<= 16; if (target_big_endian) insn |= bfd_getb16 ((char *) buf); else insn |= bfd_getl16 ((char *) buf); buf += 2; } return insn; } /* Write microMIPS or MIPS16 instruction INSN to BUF, given that the instruction is LENGTH bytes long. Return a pointer to the next byte. */ static char * write_compressed_insn (char *buf, unsigned int insn, unsigned int length) { unsigned int i; for (i = 0; i < length; i += 2) md_number_to_chars (buf + i, insn >> ((length - i - 2) * 8), 2); return buf + length; } /* Install INSN at the location specified by its "frag" and "where" fields. */ static void install_insn (const struct mips_cl_insn *insn) { char *f = insn->frag->fr_literal + insn->where; if (HAVE_CODE_COMPRESSION) write_compressed_insn (f, insn->insn_opcode, insn_length (insn)); else write_insn (f, insn->insn_opcode); mips_record_compressed_mode (); } /* Move INSN to offset WHERE in FRAG. Adjust the fixups accordingly and install the opcode in the new location. */ static void move_insn (struct mips_cl_insn *insn, fragS *frag, long where) { size_t i; insn->frag = frag; insn->where = where; for (i = 0; i < ARRAY_SIZE (insn->fixp); i++) if (insn->fixp[i] != NULL) { insn->fixp[i]->fx_frag = frag; insn->fixp[i]->fx_where = where; } install_insn (insn); } /* Add INSN to the end of the output. */ static void add_fixed_insn (struct mips_cl_insn *insn) { char *f = frag_more (insn_length (insn)); move_insn (insn, frag_now, f - frag_now->fr_literal); } /* Start a variant frag and move INSN to the start of the variant part, marking it as fixed. The other arguments are as for frag_var. */ static void add_relaxed_insn (struct mips_cl_insn *insn, int max_chars, int var, relax_substateT subtype, symbolS *symbol, offsetT offset) { frag_grow (max_chars); move_insn (insn, frag_now, frag_more (0) - frag_now->fr_literal); insn->fixed_p = 1; frag_var (rs_machine_dependent, max_chars, var, subtype, symbol, offset, NULL); } /* Insert N copies of INSN into the history buffer, starting at position FIRST. Neither FIRST nor N need to be clipped. */ static void insert_into_history (unsigned int first, unsigned int n, const struct mips_cl_insn *insn) { if (mips_relax.sequence != 2) { unsigned int i; for (i = ARRAY_SIZE (history); i-- > first;) if (i >= first + n) history[i] = history[i - n]; else history[i] = *insn; } } /* Clear the error in insn_error. */ static void clear_insn_error (void) { memset (&insn_error, 0, sizeof (insn_error)); } /* Possibly record error message MSG for the current instruction. If the error is about a particular argument, ARGNUM is the 1-based number of that argument, otherwise it is 0. FORMAT is the format of MSG. Return true if MSG was used, false if the current message was kept. */ static bfd_boolean set_insn_error_format (int argnum, enum mips_insn_error_format format, const char *msg) { if (argnum == 0) { /* Give priority to errors against specific arguments, and to the first whole-instruction message. */ if (insn_error.msg) return FALSE; } else { /* Keep insn_error if it is against a later argument. */ if (argnum < insn_error.min_argnum) return FALSE; /* If both errors are against the same argument but are different, give up on reporting a specific error for this argument. See the comment about mips_insn_error for details. */ if (argnum == insn_error.min_argnum && insn_error.msg && strcmp (insn_error.msg, msg) != 0) { insn_error.msg = 0; insn_error.min_argnum += 1; return FALSE; } } insn_error.min_argnum = argnum; insn_error.format = format; insn_error.msg = msg; return TRUE; } /* Record an instruction error with no % format fields. ARGNUM and MSG are as for set_insn_error_format. */ static void set_insn_error (int argnum, const char *msg) { set_insn_error_format (argnum, ERR_FMT_PLAIN, msg); } /* Record an instruction error with one %d field I. ARGNUM and MSG are as for set_insn_error_format. */ static void set_insn_error_i (int argnum, const char *msg, int i) { if (set_insn_error_format (argnum, ERR_FMT_I, msg)) insn_error.u.i = i; } /* Record an instruction error with two %s fields S1 and S2. ARGNUM and MSG are as for set_insn_error_format. */ static void set_insn_error_ss (int argnum, const char *msg, const char *s1, const char *s2) { if (set_insn_error_format (argnum, ERR_FMT_SS, msg)) { insn_error.u.ss[0] = s1; insn_error.u.ss[1] = s2; } } /* Report the error in insn_error, which is against assembly code STR. */ static void report_insn_error (const char *str) { const char *msg = concat (insn_error.msg, " `%s'", NULL); switch (insn_error.format) { case ERR_FMT_PLAIN: as_bad (msg, str); break; case ERR_FMT_I: as_bad (msg, insn_error.u.i, str); break; case ERR_FMT_SS: as_bad (msg, insn_error.u.ss[0], insn_error.u.ss[1], str); break; } free ((char *) msg); } /* Initialize vr4120_conflicts. There is a bit of duplication here: the idea is to make it obvious at a glance that each errata is included. */ static void init_vr4120_conflicts (void) { #define CONFLICT(FIRST, SECOND) \ vr4120_conflicts[FIX_VR4120_##FIRST] |= 1 << FIX_VR4120_##SECOND /* Errata 21 - [D]DIV[U] after [D]MACC */ CONFLICT (MACC, DIV); CONFLICT (DMACC, DIV); /* Errata 23 - Continuous DMULT[U]/DMACC instructions. */ CONFLICT (DMULT, DMULT); CONFLICT (DMULT, DMACC); CONFLICT (DMACC, DMULT); CONFLICT (DMACC, DMACC); /* Errata 24 - MT{LO,HI} after [D]MACC */ CONFLICT (MACC, MTHILO); CONFLICT (DMACC, MTHILO); /* VR4181A errata MD(1): "If a MULT, MULTU, DMULT or DMULTU instruction is executed immediately after a MACC or DMACC instruction, the result of [either instruction] is incorrect." */ CONFLICT (MACC, MULT); CONFLICT (MACC, DMULT); CONFLICT (DMACC, MULT); CONFLICT (DMACC, DMULT); /* VR4181A errata MD(4): "If a MACC or DMACC instruction is executed immediately after a DMULT, DMULTU, DIV, DIVU, DDIV or DDIVU instruction, the result of the MACC or DMACC instruction is incorrect.". */ CONFLICT (DMULT, MACC); CONFLICT (DMULT, DMACC); CONFLICT (DIV, MACC); CONFLICT (DIV, DMACC); #undef CONFLICT } struct regname { const char *name; unsigned int num; }; #define RNUM_MASK 0x00000ff #define RTYPE_MASK 0x0ffff00 #define RTYPE_NUM 0x0000100 #define RTYPE_FPU 0x0000200 #define RTYPE_FCC 0x0000400 #define RTYPE_VEC 0x0000800 #define RTYPE_GP 0x0001000 #define RTYPE_CP0 0x0002000 #define RTYPE_PC 0x0004000 #define RTYPE_ACC 0x0008000 #define RTYPE_CCC 0x0010000 #define RTYPE_VI 0x0020000 #define RTYPE_VF 0x0040000 #define RTYPE_R5900_I 0x0080000 #define RTYPE_R5900_Q 0x0100000 #define RTYPE_R5900_R 0x0200000 #define RTYPE_R5900_ACC 0x0400000 #define RTYPE_MSA 0x0800000 #define RWARN 0x8000000 #define GENERIC_REGISTER_NUMBERS \ {"$0", RTYPE_NUM | 0}, \ {"$1", RTYPE_NUM | 1}, \ {"$2", RTYPE_NUM | 2}, \ {"$3", RTYPE_NUM | 3}, \ {"$4", RTYPE_NUM | 4}, \ {"$5", RTYPE_NUM | 5}, \ {"$6", RTYPE_NUM | 6}, \ {"$7", RTYPE_NUM | 7}, \ {"$8", RTYPE_NUM | 8}, \ {"$9", RTYPE_NUM | 9}, \ {"$10", RTYPE_NUM | 10}, \ {"$11", RTYPE_NUM | 11}, \ {"$12", RTYPE_NUM | 12}, \ {"$13", RTYPE_NUM | 13}, \ {"$14", RTYPE_NUM | 14}, \ {"$15", RTYPE_NUM | 15}, \ {"$16", RTYPE_NUM | 16}, \ {"$17", RTYPE_NUM | 17}, \ {"$18", RTYPE_NUM | 18}, \ {"$19", RTYPE_NUM | 19}, \ {"$20", RTYPE_NUM | 20}, \ {"$21", RTYPE_NUM | 21}, \ {"$22", RTYPE_NUM | 22}, \ {"$23", RTYPE_NUM | 23}, \ {"$24", RTYPE_NUM | 24}, \ {"$25", RTYPE_NUM | 25}, \ {"$26", RTYPE_NUM | 26}, \ {"$27", RTYPE_NUM | 27}, \ {"$28", RTYPE_NUM | 28}, \ {"$29", RTYPE_NUM | 29}, \ {"$30", RTYPE_NUM | 30}, \ {"$31", RTYPE_NUM | 31} #define FPU_REGISTER_NAMES \ {"$f0", RTYPE_FPU | 0}, \ {"$f1", RTYPE_FPU | 1}, \ {"$f2", RTYPE_FPU | 2}, \ {"$f3", RTYPE_FPU | 3}, \ {"$f4", RTYPE_FPU | 4}, \ {"$f5", RTYPE_FPU | 5}, \ {"$f6", RTYPE_FPU | 6}, \ {"$f7", RTYPE_FPU | 7}, \ {"$f8", RTYPE_FPU | 8}, \ {"$f9", RTYPE_FPU | 9}, \ {"$f10", RTYPE_FPU | 10}, \ {"$f11", RTYPE_FPU | 11}, \ {"$f12", RTYPE_FPU | 12}, \ {"$f13", RTYPE_FPU | 13}, \ {"$f14", RTYPE_FPU | 14}, \ {"$f15", RTYPE_FPU | 15}, \ {"$f16", RTYPE_FPU | 16}, \ {"$f17", RTYPE_FPU | 17}, \ {"$f18", RTYPE_FPU | 18}, \ {"$f19", RTYPE_FPU | 19}, \ {"$f20", RTYPE_FPU | 20}, \ {"$f21", RTYPE_FPU | 21}, \ {"$f22", RTYPE_FPU | 22}, \ {"$f23", RTYPE_FPU | 23}, \ {"$f24", RTYPE_FPU | 24}, \ {"$f25", RTYPE_FPU | 25}, \ {"$f26", RTYPE_FPU | 26}, \ {"$f27", RTYPE_FPU | 27}, \ {"$f28", RTYPE_FPU | 28}, \ {"$f29", RTYPE_FPU | 29}, \ {"$f30", RTYPE_FPU | 30}, \ {"$f31", RTYPE_FPU | 31} #define FPU_CONDITION_CODE_NAMES \ {"$fcc0", RTYPE_FCC | 0}, \ {"$fcc1", RTYPE_FCC | 1}, \ {"$fcc2", RTYPE_FCC | 2}, \ {"$fcc3", RTYPE_FCC | 3}, \ {"$fcc4", RTYPE_FCC | 4}, \ {"$fcc5", RTYPE_FCC | 5}, \ {"$fcc6", RTYPE_FCC | 6}, \ {"$fcc7", RTYPE_FCC | 7} #define COPROC_CONDITION_CODE_NAMES \ {"$cc0", RTYPE_FCC | RTYPE_CCC | 0}, \ {"$cc1", RTYPE_FCC | RTYPE_CCC | 1}, \ {"$cc2", RTYPE_FCC | RTYPE_CCC | 2}, \ {"$cc3", RTYPE_FCC | RTYPE_CCC | 3}, \ {"$cc4", RTYPE_FCC | RTYPE_CCC | 4}, \ {"$cc5", RTYPE_FCC | RTYPE_CCC | 5}, \ {"$cc6", RTYPE_FCC | RTYPE_CCC | 6}, \ {"$cc7", RTYPE_FCC | RTYPE_CCC | 7} #define N32N64_SYMBOLIC_REGISTER_NAMES \ {"$a4", RTYPE_GP | 8}, \ {"$a5", RTYPE_GP | 9}, \ {"$a6", RTYPE_GP | 10}, \ {"$a7", RTYPE_GP | 11}, \ {"$ta0", RTYPE_GP | 8}, /* alias for $a4 */ \ {"$ta1", RTYPE_GP | 9}, /* alias for $a5 */ \ {"$ta2", RTYPE_GP | 10}, /* alias for $a6 */ \ {"$ta3", RTYPE_GP | 11}, /* alias for $a7 */ \ {"$t0", RTYPE_GP | 12}, \ {"$t1", RTYPE_GP | 13}, \ {"$t2", RTYPE_GP | 14}, \ {"$t3", RTYPE_GP | 15} #define O32_SYMBOLIC_REGISTER_NAMES \ {"$t0", RTYPE_GP | 8}, \ {"$t1", RTYPE_GP | 9}, \ {"$t2", RTYPE_GP | 10}, \ {"$t3", RTYPE_GP | 11}, \ {"$t4", RTYPE_GP | 12}, \ {"$t5", RTYPE_GP | 13}, \ {"$t6", RTYPE_GP | 14}, \ {"$t7", RTYPE_GP | 15}, \ {"$ta0", RTYPE_GP | 12}, /* alias for $t4 */ \ {"$ta1", RTYPE_GP | 13}, /* alias for $t5 */ \ {"$ta2", RTYPE_GP | 14}, /* alias for $t6 */ \ {"$ta3", RTYPE_GP | 15} /* alias for $t7 */ /* Remaining symbolic register names */ #define SYMBOLIC_REGISTER_NAMES \ {"$zero", RTYPE_GP | 0}, \ {"$at", RTYPE_GP | 1}, \ {"$AT", RTYPE_GP | 1}, \ {"$v0", RTYPE_GP | 2}, \ {"$v1", RTYPE_GP | 3}, \ {"$a0", RTYPE_GP | 4}, \ {"$a1", RTYPE_GP | 5}, \ {"$a2", RTYPE_GP | 6}, \ {"$a3", RTYPE_GP | 7}, \ {"$s0", RTYPE_GP | 16}, \ {"$s1", RTYPE_GP | 17}, \ {"$s2", RTYPE_GP | 18}, \ {"$s3", RTYPE_GP | 19}, \ {"$s4", RTYPE_GP | 20}, \ {"$s5", RTYPE_GP | 21}, \ {"$s6", RTYPE_GP | 22}, \ {"$s7", RTYPE_GP | 23}, \ {"$t8", RTYPE_GP | 24}, \ {"$t9", RTYPE_GP | 25}, \ {"$k0", RTYPE_GP | 26}, \ {"$kt0", RTYPE_GP | 26}, \ {"$k1", RTYPE_GP | 27}, \ {"$kt1", RTYPE_GP | 27}, \ {"$gp", RTYPE_GP | 28}, \ {"$sp", RTYPE_GP | 29}, \ {"$s8", RTYPE_GP | 30}, \ {"$fp", RTYPE_GP | 30}, \ {"$ra", RTYPE_GP | 31} #define MIPS16_SPECIAL_REGISTER_NAMES \ {"$pc", RTYPE_PC | 0} #define MDMX_VECTOR_REGISTER_NAMES \ /* {"$v0", RTYPE_VEC | 0}, clash with REG 2 above */ \ /* {"$v1", RTYPE_VEC | 1}, clash with REG 3 above */ \ {"$v2", RTYPE_VEC | 2}, \ {"$v3", RTYPE_VEC | 3}, \ {"$v4", RTYPE_VEC | 4}, \ {"$v5", RTYPE_VEC | 5}, \ {"$v6", RTYPE_VEC | 6}, \ {"$v7", RTYPE_VEC | 7}, \ {"$v8", RTYPE_VEC | 8}, \ {"$v9", RTYPE_VEC | 9}, \ {"$v10", RTYPE_VEC | 10}, \ {"$v11", RTYPE_VEC | 11}, \ {"$v12", RTYPE_VEC | 12}, \ {"$v13", RTYPE_VEC | 13}, \ {"$v14", RTYPE_VEC | 14}, \ {"$v15", RTYPE_VEC | 15}, \ {"$v16", RTYPE_VEC | 16}, \ {"$v17", RTYPE_VEC | 17}, \ {"$v18", RTYPE_VEC | 18}, \ {"$v19", RTYPE_VEC | 19}, \ {"$v20", RTYPE_VEC | 20}, \ {"$v21", RTYPE_VEC | 21}, \ {"$v22", RTYPE_VEC | 22}, \ {"$v23", RTYPE_VEC | 23}, \ {"$v24", RTYPE_VEC | 24}, \ {"$v25", RTYPE_VEC | 25}, \ {"$v26", RTYPE_VEC | 26}, \ {"$v27", RTYPE_VEC | 27}, \ {"$v28", RTYPE_VEC | 28}, \ {"$v29", RTYPE_VEC | 29}, \ {"$v30", RTYPE_VEC | 30}, \ {"$v31", RTYPE_VEC | 31} #define R5900_I_NAMES \ {"$I", RTYPE_R5900_I | 0} #define R5900_Q_NAMES \ {"$Q", RTYPE_R5900_Q | 0} #define R5900_R_NAMES \ {"$R", RTYPE_R5900_R | 0} #define R5900_ACC_NAMES \ {"$ACC", RTYPE_R5900_ACC | 0 } #define MIPS_DSP_ACCUMULATOR_NAMES \ {"$ac0", RTYPE_ACC | 0}, \ {"$ac1", RTYPE_ACC | 1}, \ {"$ac2", RTYPE_ACC | 2}, \ {"$ac3", RTYPE_ACC | 3} static const struct regname reg_names[] = { GENERIC_REGISTER_NUMBERS, FPU_REGISTER_NAMES, FPU_CONDITION_CODE_NAMES, COPROC_CONDITION_CODE_NAMES, /* The $txx registers depends on the abi, these will be added later into the symbol table from one of the tables below once mips_abi is set after parsing of arguments from the command line. */ SYMBOLIC_REGISTER_NAMES, MIPS16_SPECIAL_REGISTER_NAMES, MDMX_VECTOR_REGISTER_NAMES, R5900_I_NAMES, R5900_Q_NAMES, R5900_R_NAMES, R5900_ACC_NAMES, MIPS_DSP_ACCUMULATOR_NAMES, {0, 0} }; static const struct regname reg_names_o32[] = { O32_SYMBOLIC_REGISTER_NAMES, {0, 0} }; static const struct regname reg_names_n32n64[] = { N32N64_SYMBOLIC_REGISTER_NAMES, {0, 0} }; /* Register symbols $v0 and $v1 map to GPRs 2 and 3, but they can also be interpreted as vector registers 0 and 1. If SYMVAL is the value of one of these register symbols, return the associated vector register, otherwise return SYMVAL itself. */ static unsigned int mips_prefer_vec_regno (unsigned int symval) { if ((symval & -2) == (RTYPE_GP | 2)) return RTYPE_VEC | (symval & 1); return symval; } /* Return true if string [S, E) is a valid register name, storing its symbol value in *SYMVAL_PTR if so. */ static bfd_boolean mips_parse_register_1 (char *s, char *e, unsigned int *symval_ptr) { char save_c; symbolS *symbol; /* Terminate name. */ save_c = *e; *e = '\0'; /* Look up the name. */ symbol = symbol_find (s); *e = save_c; if (!symbol || S_GET_SEGMENT (symbol) != reg_section) return FALSE; *symval_ptr = S_GET_VALUE (symbol); return TRUE; } /* Return true if the string at *SPTR is a valid register name. Allow it to have a VU0-style channel suffix of the form x?y?z?w? if CHANNELS_PTR is nonnull. When returning true, move *SPTR past the register, store the register's symbol value in *SYMVAL_PTR and the channel mask in *CHANNELS_PTR (if nonnull). The symbol value includes the register number (RNUM_MASK) and register type (RTYPE_MASK). The channel mask is a 4-bit value of the form XYZW and is 0 if no suffix was given. */ static bfd_boolean mips_parse_register (char **sptr, unsigned int *symval_ptr, unsigned int *channels_ptr) { char *s, *e, *m; const char *q; unsigned int channels, symval, bit; /* Find end of name. */ s = e = *sptr; if (is_name_beginner (*e)) ++e; while (is_part_of_name (*e)) ++e; channels = 0; if (!mips_parse_register_1 (s, e, &symval)) { if (!channels_ptr) return FALSE; /* Eat characters from the end of the string that are valid channel suffixes. The preceding register must be $ACC or end with a digit, so there is no ambiguity. */ bit = 1; m = e; for (q = "wzyx"; *q; q++, bit <<= 1) if (m > s && m[-1] == *q) { --m; channels |= bit; } if (channels == 0 || !mips_parse_register_1 (s, m, &symval) || (symval & (RTYPE_VI | RTYPE_VF | RTYPE_R5900_ACC)) == 0) return FALSE; } *sptr = e; *symval_ptr = symval; if (channels_ptr) *channels_ptr = channels; return TRUE; } /* Check if SPTR points at a valid register specifier according to TYPES. If so, then return 1, advance S to consume the specifier and store the register's number in REGNOP, otherwise return 0. */ static int reg_lookup (char **s, unsigned int types, unsigned int *regnop) { unsigned int regno; if (mips_parse_register (s, &regno, NULL)) { if (types & RTYPE_VEC) regno = mips_prefer_vec_regno (regno); if (regno & types) regno &= RNUM_MASK; else regno = ~0; } else { if (types & RWARN) as_warn (_("unrecognized register name `%s'"), *s); regno = ~0; } if (regnop) *regnop = regno; return regno <= RNUM_MASK; } /* Parse a VU0 "x?y?z?w?" channel mask at S and store the associated mask in *CHANNELS. Return a pointer to the first unconsumed character. */ static char * mips_parse_vu0_channels (char *s, unsigned int *channels) { unsigned int i; *channels = 0; for (i = 0; i < 4; i++) if (*s == "xyzw"[i]) { *channels |= 1 << (3 - i); ++s; } return s; } /* Token types for parsed operand lists. */ enum mips_operand_token_type { /* A plain register, e.g. $f2. */ OT_REG, /* A 4-bit XYZW channel mask. */ OT_CHANNELS, /* A constant vector index, e.g. [1]. */ OT_INTEGER_INDEX, /* A register vector index, e.g. [$2]. */ OT_REG_INDEX, /* A continuous range of registers, e.g. $s0-$s4. */ OT_REG_RANGE, /* A (possibly relocated) expression. */ OT_INTEGER, /* A floating-point value. */ OT_FLOAT, /* A single character. This can be '(', ')' or ',', but '(' only appears before OT_REGs. */ OT_CHAR, /* A doubled character, either "--" or "++". */ OT_DOUBLE_CHAR, /* The end of the operand list. */ OT_END }; /* A parsed operand token. */ struct mips_operand_token { /* The type of token. */ enum mips_operand_token_type type; union { /* The register symbol value for an OT_REG or OT_REG_INDEX. */ unsigned int regno; /* The 4-bit channel mask for an OT_CHANNEL_SUFFIX. */ unsigned int channels; /* The integer value of an OT_INTEGER_INDEX. */ addressT index; /* The two register symbol values involved in an OT_REG_RANGE. */ struct { unsigned int regno1; unsigned int regno2; } reg_range; /* The value of an OT_INTEGER. The value is represented as an expression and the relocation operators that were applied to that expression. The reloc entries are BFD_RELOC_UNUSED if no relocation operators were used. */ struct { expressionS value; bfd_reloc_code_real_type relocs[3]; } integer; /* The binary data for an OT_FLOAT constant, and the number of bytes in the constant. */ struct { unsigned char data[8]; int length; } flt; /* The character represented by an OT_CHAR or OT_DOUBLE_CHAR. */ char ch; } u; }; /* An obstack used to construct lists of mips_operand_tokens. */ static struct obstack mips_operand_tokens; /* Give TOKEN type TYPE and add it to mips_operand_tokens. */ static void mips_add_token (struct mips_operand_token *token, enum mips_operand_token_type type) { token->type = type; obstack_grow (&mips_operand_tokens, token, sizeof (*token)); } /* Check whether S is '(' followed by a register name. Add OT_CHAR and OT_REG tokens for them if so, and return a pointer to the first unconsumed character. Return null otherwise. */ static char * mips_parse_base_start (char *s) { struct mips_operand_token token; unsigned int regno, channels; bfd_boolean decrement_p; if (*s != '(') return 0; ++s; SKIP_SPACE_TABS (s); /* Only match "--" as part of a base expression. In other contexts "--X" is a double negative. */ decrement_p = (s[0] == '-' && s[1] == '-'); if (decrement_p) { s += 2; SKIP_SPACE_TABS (s); } /* Allow a channel specifier because that leads to better error messages than treating something like "$vf0x++" as an expression. */ if (!mips_parse_register (&s, &regno, &channels)) return 0; token.u.ch = '('; mips_add_token (&token, OT_CHAR); if (decrement_p) { token.u.ch = '-'; mips_add_token (&token, OT_DOUBLE_CHAR); } token.u.regno = regno; mips_add_token (&token, OT_REG); if (channels) { token.u.channels = channels; mips_add_token (&token, OT_CHANNELS); } /* For consistency, only match "++" as part of base expressions too. */ SKIP_SPACE_TABS (s); if (s[0] == '+' && s[1] == '+') { s += 2; token.u.ch = '+'; mips_add_token (&token, OT_DOUBLE_CHAR); } return s; } /* Parse one or more tokens from S. Return a pointer to the first unconsumed character on success. Return null if an error was found and store the error text in insn_error. FLOAT_FORMAT is as for mips_parse_arguments. */ static char * mips_parse_argument_token (char *s, char float_format) { char *end, *save_in; const char *err; unsigned int regno1, regno2, channels; struct mips_operand_token token; /* First look for "($reg", since we want to treat that as an OT_CHAR and OT_REG rather than an expression. */ end = mips_parse_base_start (s); if (end) return end; /* Handle other characters that end up as OT_CHARs. */ if (*s == ')' || *s == ',') { token.u.ch = *s; mips_add_token (&token, OT_CHAR); ++s; return s; } /* Handle tokens that start with a register. */ if (mips_parse_register (&s, &regno1, &channels)) { if (channels) { /* A register and a VU0 channel suffix. */ token.u.regno = regno1; mips_add_token (&token, OT_REG); token.u.channels = channels; mips_add_token (&token, OT_CHANNELS); return s; } SKIP_SPACE_TABS (s); if (*s == '-') { /* A register range. */ ++s; SKIP_SPACE_TABS (s); if (!mips_parse_register (&s, &regno2, NULL)) { set_insn_error (0, _("invalid register range")); return 0; } token.u.reg_range.regno1 = regno1; token.u.reg_range.regno2 = regno2; mips_add_token (&token, OT_REG_RANGE); return s; } /* Add the register itself. */ token.u.regno = regno1; mips_add_token (&token, OT_REG); /* Check for a vector index. */ if (*s == '[') { ++s; SKIP_SPACE_TABS (s); if (mips_parse_register (&s, &token.u.regno, NULL)) mips_add_token (&token, OT_REG_INDEX); else { expressionS element; my_getExpression (&element, s); if (element.X_op != O_constant) { set_insn_error (0, _("vector element must be constant")); return 0; } s = expr_end; token.u.index = element.X_add_number; mips_add_token (&token, OT_INTEGER_INDEX); } SKIP_SPACE_TABS (s); if (*s != ']') { set_insn_error (0, _("missing `]'")); return 0; } ++s; } return s; } if (float_format) { /* First try to treat expressions as floats. */ save_in = input_line_pointer; input_line_pointer = s; err = md_atof (float_format, (char *) token.u.flt.data, &token.u.flt.length); end = input_line_pointer; input_line_pointer = save_in; if (err && *err) { set_insn_error (0, err); return 0; } if (s != end) { mips_add_token (&token, OT_FLOAT); return end; } } /* Treat everything else as an integer expression. */ token.u.integer.relocs[0] = BFD_RELOC_UNUSED; token.u.integer.relocs[1] = BFD_RELOC_UNUSED; token.u.integer.relocs[2] = BFD_RELOC_UNUSED; my_getSmallExpression (&token.u.integer.value, token.u.integer.relocs, s); s = expr_end; mips_add_token (&token, OT_INTEGER); return s; } /* S points to the operand list for an instruction. FLOAT_FORMAT is 'f' if expressions should be treated as 32-bit floating-point constants, 'd' if they should be treated as 64-bit floating-point constants, or 0 if they should be treated as integer expressions (the usual case). Return a list of tokens on success, otherwise return 0. The caller must obstack_free the list after use. */ static struct mips_operand_token * mips_parse_arguments (char *s, char float_format) { struct mips_operand_token token; SKIP_SPACE_TABS (s); while (*s) { s = mips_parse_argument_token (s, float_format); if (!s) { obstack_free (&mips_operand_tokens, obstack_finish (&mips_operand_tokens)); return 0; } SKIP_SPACE_TABS (s); } mips_add_token (&token, OT_END); return (struct mips_operand_token *) obstack_finish (&mips_operand_tokens); } /* Return TRUE if opcode MO is valid on the currently selected ISA, ASE and architecture. Use is_opcode_valid_16 for MIPS16 opcodes. */ static bfd_boolean is_opcode_valid (const struct mips_opcode *mo) { int isa = mips_opts.isa; int ase = mips_opts.ase; int fp_s, fp_d; unsigned int i; if (ISA_HAS_64BIT_REGS (isa)) for (i = 0; i < ARRAY_SIZE (mips_ases); i++) if ((ase & mips_ases[i].flags) == mips_ases[i].flags) ase |= mips_ases[i].flags64; if (!opcode_is_member (mo, isa, ase, mips_opts.arch)) return FALSE; /* Check whether the instruction or macro requires single-precision or double-precision floating-point support. Note that this information is stored differently in the opcode table for insns and macros. */ if (mo->pinfo == INSN_MACRO) { fp_s = mo->pinfo2 & INSN2_M_FP_S; fp_d = mo->pinfo2 & INSN2_M_FP_D; } else { fp_s = mo->pinfo & FP_S; fp_d = mo->pinfo & FP_D; } if (fp_d && (mips_opts.soft_float || mips_opts.single_float)) return FALSE; if (fp_s && mips_opts.soft_float) return FALSE; return TRUE; } /* Return TRUE if the MIPS16 opcode MO is valid on the currently selected ISA and architecture. */ static bfd_boolean is_opcode_valid_16 (const struct mips_opcode *mo) { return opcode_is_member (mo, mips_opts.isa, 0, mips_opts.arch); } /* Return TRUE if the size of the microMIPS opcode MO matches one explicitly requested. Always TRUE in the standard MIPS mode. Use is_size_valid_16 for MIPS16 opcodes. */ static bfd_boolean is_size_valid (const struct mips_opcode *mo) { if (!mips_opts.micromips) return TRUE; if (mips_opts.insn32) { if (mo->pinfo != INSN_MACRO && micromips_insn_length (mo) != 4) return FALSE; if ((mo->pinfo2 & INSN2_BRANCH_DELAY_16BIT) != 0) return FALSE; } if (!forced_insn_length) return TRUE; if (mo->pinfo == INSN_MACRO) return FALSE; return forced_insn_length == micromips_insn_length (mo); } /* Return TRUE if the size of the MIPS16 opcode MO matches one explicitly requested. */ static bfd_boolean is_size_valid_16 (const struct mips_opcode *mo) { if (!forced_insn_length) return TRUE; if (mo->pinfo == INSN_MACRO) return FALSE; if (forced_insn_length == 2 && mips_opcode_32bit_p (mo)) return FALSE; return TRUE; } /* Return TRUE if the microMIPS opcode MO is valid for the delay slot of the preceding instruction. Always TRUE in the standard MIPS mode. We don't accept macros in 16-bit delay slots to avoid a case where a macro expansion fails because it relies on a preceding 32-bit real instruction to have matched and does not handle the operands correctly. The only macros that may expand to 16-bit instructions are JAL that cannot be placed in a delay slot anyway, and corner cases of BALIGN and BGT (that likewise cannot be placed in a delay slot) that decay to a NOP. In all these cases the macros precede any corresponding real instruction definitions in the opcode table, so they will match in the second pass where the size of the delay slot is ignored and therefore produce correct code. */ static bfd_boolean is_delay_slot_valid (const struct mips_opcode *mo) { if (!mips_opts.micromips) return TRUE; if (mo->pinfo == INSN_MACRO) return (history[0].insn_mo->pinfo2 & INSN2_BRANCH_DELAY_16BIT) == 0; if ((history[0].insn_mo->pinfo2 & INSN2_BRANCH_DELAY_32BIT) != 0 && micromips_insn_length (mo) != 4) return FALSE; if ((history[0].insn_mo->pinfo2 & INSN2_BRANCH_DELAY_16BIT) != 0 && micromips_insn_length (mo) != 2) return FALSE; return TRUE; } /* For consistency checking, verify that all bits of OPCODE are specified either by the match/mask part of the instruction definition, or by the operand list. Also build up a list of operands in OPERANDS. INSN_BITS says which bits of the instruction are significant. If OPCODE is a standard or microMIPS instruction, DECODE_OPERAND provides the mips_operand description of each operand. DECODE_OPERAND is null for MIPS16 instructions. */ static int validate_mips_insn (const struct mips_opcode *opcode, unsigned long insn_bits, const struct mips_operand *(*decode_operand) (const char *), struct mips_operand_array *operands) { const char *s; unsigned long used_bits, doubled, undefined, opno, mask; const struct mips_operand *operand; mask = (opcode->pinfo == INSN_MACRO ? 0 : opcode->mask); if ((mask & opcode->match) != opcode->match) { as_bad (_("internal: bad mips opcode (mask error): %s %s"), opcode->name, opcode->args); return 0; } used_bits = 0; opno = 0; if (opcode->pinfo2 & INSN2_VU0_CHANNEL_SUFFIX) used_bits = mips_insert_operand (&mips_vu0_channel_mask, used_bits, -1); for (s = opcode->args; *s; ++s) switch (*s) { case ',': case '(': case ')': break; case '#': s++; break; default: if (!decode_operand) operand = decode_mips16_operand (*s, mips_opcode_32bit_p (opcode)); else operand = decode_operand (s); if (!operand && opcode->pinfo != INSN_MACRO) { as_bad (_("internal: unknown operand type: %s %s"), opcode->name, opcode->args); return 0; } gas_assert (opno < MAX_OPERANDS); operands->operand[opno] = operand; if (operand && operand->type != OP_VU0_MATCH_SUFFIX) { used_bits = mips_insert_operand (operand, used_bits, -1); if (operand->type == OP_MDMX_IMM_REG) /* Bit 5 is the format selector (OB vs QH). The opcode table has separate entries for each format. */ used_bits &= ~(1 << (operand->lsb + 5)); if (operand->type == OP_ENTRY_EXIT_LIST) used_bits &= ~(mask & 0x700); } /* Skip prefix characters. */ if (decode_operand && (*s == '+' || *s == 'm' || *s == '-')) ++s; opno += 1; break; } doubled = used_bits & mask & insn_bits; if (doubled) { as_bad (_("internal: bad mips opcode (bits 0x%08lx doubly defined):" " %s %s"), doubled, opcode->name, opcode->args); return 0; } used_bits |= mask; undefined = ~used_bits & insn_bits; if (opcode->pinfo != INSN_MACRO && undefined) { as_bad (_("internal: bad mips opcode (bits 0x%08lx undefined): %s %s"), undefined, opcode->name, opcode->args); return 0; } used_bits &= ~insn_bits; if (used_bits) { as_bad (_("internal: bad mips opcode (bits 0x%08lx defined): %s %s"), used_bits, opcode->name, opcode->args); return 0; } return 1; } /* The MIPS16 version of validate_mips_insn. */ static int validate_mips16_insn (const struct mips_opcode *opcode, struct mips_operand_array *operands) { unsigned long insn_bits = mips_opcode_32bit_p (opcode) ? 0xffffffff : 0xffff; return validate_mips_insn (opcode, insn_bits, 0, operands); } /* The microMIPS version of validate_mips_insn. */ static int validate_micromips_insn (const struct mips_opcode *opc, struct mips_operand_array *operands) { unsigned long insn_bits; unsigned long major; unsigned int length; if (opc->pinfo == INSN_MACRO) return validate_mips_insn (opc, 0xffffffff, decode_micromips_operand, operands); length = micromips_insn_length (opc); if (length != 2 && length != 4) { as_bad (_("internal error: bad microMIPS opcode (incorrect length: %u): " "%s %s"), length, opc->name, opc->args); return 0; } major = opc->match >> (10 + 8 * (length - 2)); if ((length == 2 && (major & 7) != 1 && (major & 6) != 2) || (length == 4 && (major & 7) != 0 && (major & 4) != 4)) { as_bad (_("internal error: bad microMIPS opcode " "(opcode/length mismatch): %s %s"), opc->name, opc->args); return 0; } /* Shift piecewise to avoid an overflow where unsigned long is 32-bit. */ insn_bits = 1 << 4 * length; insn_bits <<= 4 * length; insn_bits -= 1; return validate_mips_insn (opc, insn_bits, decode_micromips_operand, operands); } /* This function is called once, at assembler startup time. It should set up all the tables, etc. that the MD part of the assembler will need. */ void md_begin (void) { const char *retval = NULL; int i = 0; int broken = 0; if (mips_pic != NO_PIC) { if (g_switch_seen && g_switch_value != 0) as_bad (_("-G may not be used in position-independent code")); g_switch_value = 0; } else if (mips_abicalls) { if (g_switch_seen && g_switch_value != 0) as_bad (_("-G may not be used with abicalls")); g_switch_value = 0; } if (! bfd_set_arch_mach (stdoutput, bfd_arch_mips, file_mips_opts.arch)) as_warn (_("could not set architecture and machine")); op_hash = hash_new (); mips_operands = XCNEWVEC (struct mips_operand_array, NUMOPCODES); for (i = 0; i < NUMOPCODES;) { const char *name = mips_opcodes[i].name; retval = hash_insert (op_hash, name, (void *) &mips_opcodes[i]); if (retval != NULL) { fprintf (stderr, _("internal error: can't hash `%s': %s\n"), mips_opcodes[i].name, retval); /* Probably a memory allocation problem? Give up now. */ as_fatal (_("broken assembler, no assembly attempted")); } do { if (!validate_mips_insn (&mips_opcodes[i], 0xffffffff, decode_mips_operand, &mips_operands[i])) broken = 1; if (nop_insn.insn_mo == NULL && strcmp (name, "nop") == 0) { create_insn (&nop_insn, mips_opcodes + i); if (mips_fix_loongson2f_nop) nop_insn.insn_opcode = LOONGSON2F_NOP_INSN; nop_insn.fixed_p = 1; } ++i; } while ((i < NUMOPCODES) && !strcmp (mips_opcodes[i].name, name)); } mips16_op_hash = hash_new (); mips16_operands = XCNEWVEC (struct mips_operand_array, bfd_mips16_num_opcodes); i = 0; while (i < bfd_mips16_num_opcodes) { const char *name = mips16_opcodes[i].name; retval = hash_insert (mips16_op_hash, name, (void *) &mips16_opcodes[i]); if (retval != NULL) as_fatal (_("internal: can't hash `%s': %s"), mips16_opcodes[i].name, retval); do { if (!validate_mips16_insn (&mips16_opcodes[i], &mips16_operands[i])) broken = 1; if (mips16_nop_insn.insn_mo == NULL && strcmp (name, "nop") == 0) { create_insn (&mips16_nop_insn, mips16_opcodes + i); mips16_nop_insn.fixed_p = 1; } ++i; } while (i < bfd_mips16_num_opcodes && strcmp (mips16_opcodes[i].name, name) == 0); } micromips_op_hash = hash_new (); micromips_operands = XCNEWVEC (struct mips_operand_array, bfd_micromips_num_opcodes); i = 0; while (i < bfd_micromips_num_opcodes) { const char *name = micromips_opcodes[i].name; retval = hash_insert (micromips_op_hash, name, (void *) &micromips_opcodes[i]); if (retval != NULL) as_fatal (_("internal: can't hash `%s': %s"), micromips_opcodes[i].name, retval); do { struct mips_cl_insn *micromips_nop_insn; if (!validate_micromips_insn (&micromips_opcodes[i], &micromips_operands[i])) broken = 1; if (micromips_opcodes[i].pinfo != INSN_MACRO) { if (micromips_insn_length (micromips_opcodes + i) == 2) micromips_nop_insn = &micromips_nop16_insn; else if (micromips_insn_length (micromips_opcodes + i) == 4) micromips_nop_insn = &micromips_nop32_insn; else continue; if (micromips_nop_insn->insn_mo == NULL && strcmp (name, "nop") == 0) { create_insn (micromips_nop_insn, micromips_opcodes + i); micromips_nop_insn->fixed_p = 1; } } } while (++i < bfd_micromips_num_opcodes && strcmp (micromips_opcodes[i].name, name) == 0); } if (broken) as_fatal (_("broken assembler, no assembly attempted")); /* We add all the general register names to the symbol table. This helps us detect invalid uses of them. */ for (i = 0; reg_names[i].name; i++) symbol_table_insert (symbol_new (reg_names[i].name, reg_section, reg_names[i].num, /* & RNUM_MASK, */ &zero_address_frag)); if (HAVE_NEWABI) for (i = 0; reg_names_n32n64[i].name; i++) symbol_table_insert (symbol_new (reg_names_n32n64[i].name, reg_section, reg_names_n32n64[i].num, /* & RNUM_MASK, */ &zero_address_frag)); else for (i = 0; reg_names_o32[i].name; i++) symbol_table_insert (symbol_new (reg_names_o32[i].name, reg_section, reg_names_o32[i].num, /* & RNUM_MASK, */ &zero_address_frag)); for (i = 0; i < 32; i++) { char regname[6]; /* R5900 VU0 floating-point register. */ sprintf (regname, "$vf%d", i); symbol_table_insert (symbol_new (regname, reg_section, RTYPE_VF | i, &zero_address_frag)); /* R5900 VU0 integer register. */ sprintf (regname, "$vi%d", i); symbol_table_insert (symbol_new (regname, reg_section, RTYPE_VI | i, &zero_address_frag)); /* MSA register. */ sprintf (regname, "$w%d", i); symbol_table_insert (symbol_new (regname, reg_section, RTYPE_MSA | i, &zero_address_frag)); } obstack_init (&mips_operand_tokens); mips_no_prev_insn (); mips_gprmask = 0; mips_cprmask[0] = 0; mips_cprmask[1] = 0; mips_cprmask[2] = 0; mips_cprmask[3] = 0; /* set the default alignment for the text section (2**2) */ record_alignment (text_section, 2); bfd_set_gp_size (stdoutput, g_switch_value); /* On a native system other than VxWorks, sections must be aligned to 16 byte boundaries. When configured for an embedded ELF target, we don't bother. */ if (strncmp (TARGET_OS, "elf", 3) != 0 && strncmp (TARGET_OS, "vxworks", 7) != 0) { (void) bfd_set_section_alignment (stdoutput, text_section, 4); (void) bfd_set_section_alignment (stdoutput, data_section, 4); (void) bfd_set_section_alignment (stdoutput, bss_section, 4); } /* Create a .reginfo section for register masks and a .mdebug section for debugging information. */ { segT seg; subsegT subseg; flagword flags; segT sec; seg = now_seg; subseg = now_subseg; /* The ABI says this section should be loaded so that the running program can access it. However, we don't load it if we are configured for an embedded target */ flags = SEC_READONLY | SEC_DATA; if (strncmp (TARGET_OS, "elf", 3) != 0) flags |= SEC_ALLOC | SEC_LOAD; if (mips_abi != N64_ABI) { sec = subseg_new (".reginfo", (subsegT) 0); bfd_set_section_flags (stdoutput, sec, flags); bfd_set_section_alignment (stdoutput, sec, HAVE_NEWABI ? 3 : 2); mips_regmask_frag = frag_more (sizeof (Elf32_External_RegInfo)); } else { /* The 64-bit ABI uses a .MIPS.options section rather than .reginfo section. */ sec = subseg_new (".MIPS.options", (subsegT) 0); bfd_set_section_flags (stdoutput, sec, flags); bfd_set_section_alignment (stdoutput, sec, 3); /* Set up the option header. */ { Elf_Internal_Options opthdr; char *f; opthdr.kind = ODK_REGINFO; opthdr.size = (sizeof (Elf_External_Options) + sizeof (Elf64_External_RegInfo)); opthdr.section = 0; opthdr.info = 0; f = frag_more (sizeof (Elf_External_Options)); bfd_mips_elf_swap_options_out (stdoutput, &opthdr, (Elf_External_Options *) f); mips_regmask_frag = frag_more (sizeof (Elf64_External_RegInfo)); } } sec = subseg_new (".MIPS.abiflags", (subsegT) 0); bfd_set_section_flags (stdoutput, sec, SEC_READONLY | SEC_DATA | SEC_ALLOC | SEC_LOAD); bfd_set_section_alignment (stdoutput, sec, 3); mips_flags_frag = frag_more (sizeof (Elf_External_ABIFlags_v0)); if (ECOFF_DEBUGGING) { sec = subseg_new (".mdebug", (subsegT) 0); (void) bfd_set_section_flags (stdoutput, sec, SEC_HAS_CONTENTS | SEC_READONLY); (void) bfd_set_section_alignment (stdoutput, sec, 2); } else if (mips_flag_pdr) { pdr_seg = subseg_new (".pdr", (subsegT) 0); (void) bfd_set_section_flags (stdoutput, pdr_seg, SEC_READONLY | SEC_RELOC | SEC_DEBUGGING); (void) bfd_set_section_alignment (stdoutput, pdr_seg, 2); } subseg_set (seg, subseg); } if (mips_fix_vr4120) init_vr4120_conflicts (); } static inline void fpabi_incompatible_with (int fpabi, const char *what) { as_warn (_(".gnu_attribute %d,%d is incompatible with `%s'"), Tag_GNU_MIPS_ABI_FP, fpabi, what); } static inline void fpabi_requires (int fpabi, const char *what) { as_warn (_(".gnu_attribute %d,%d requires `%s'"), Tag_GNU_MIPS_ABI_FP, fpabi, what); } /* Check -mabi and register sizes against the specified FP ABI. */ static void check_fpabi (int fpabi) { switch (fpabi) { case Val_GNU_MIPS_ABI_FP_DOUBLE: if (file_mips_opts.soft_float) fpabi_incompatible_with (fpabi, "softfloat"); else if (file_mips_opts.single_float) fpabi_incompatible_with (fpabi, "singlefloat"); if (file_mips_opts.gp == 64 && file_mips_opts.fp == 32) fpabi_incompatible_with (fpabi, "gp=64 fp=32"); else if (file_mips_opts.gp == 32 && file_mips_opts.fp == 64) fpabi_incompatible_with (fpabi, "gp=32 fp=64"); break; case Val_GNU_MIPS_ABI_FP_XX: if (mips_abi != O32_ABI) fpabi_requires (fpabi, "-mabi=32"); else if (file_mips_opts.soft_float) fpabi_incompatible_with (fpabi, "softfloat"); else if (file_mips_opts.single_float) fpabi_incompatible_with (fpabi, "singlefloat"); else if (file_mips_opts.fp != 0) fpabi_requires (fpabi, "fp=xx"); break; case Val_GNU_MIPS_ABI_FP_64A: case Val_GNU_MIPS_ABI_FP_64: if (mips_abi != O32_ABI) fpabi_requires (fpabi, "-mabi=32"); else if (file_mips_opts.soft_float) fpabi_incompatible_with (fpabi, "softfloat"); else if (file_mips_opts.single_float) fpabi_incompatible_with (fpabi, "singlefloat"); else if (file_mips_opts.fp != 64) fpabi_requires (fpabi, "fp=64"); else if (fpabi == Val_GNU_MIPS_ABI_FP_64 && !file_mips_opts.oddspreg) fpabi_incompatible_with (fpabi, "nooddspreg"); else if (fpabi == Val_GNU_MIPS_ABI_FP_64A && file_mips_opts.oddspreg) fpabi_requires (fpabi, "nooddspreg"); break; case Val_GNU_MIPS_ABI_FP_SINGLE: if (file_mips_opts.soft_float) fpabi_incompatible_with (fpabi, "softfloat"); else if (!file_mips_opts.single_float) fpabi_requires (fpabi, "singlefloat"); break; case Val_GNU_MIPS_ABI_FP_SOFT: if (!file_mips_opts.soft_float) fpabi_requires (fpabi, "softfloat"); break; case Val_GNU_MIPS_ABI_FP_OLD_64: as_warn (_(".gnu_attribute %d,%d is no longer supported"), Tag_GNU_MIPS_ABI_FP, fpabi); break; case Val_GNU_MIPS_ABI_FP_NAN2008: /* Silently ignore compatibility value. */ break; default: as_warn (_(".gnu_attribute %d,%d is not a recognized" " floating-point ABI"), Tag_GNU_MIPS_ABI_FP, fpabi); break; } } /* Perform consistency checks on the current options. */ static void mips_check_options (struct mips_set_options *opts, bfd_boolean abi_checks) { /* Check the size of integer registers agrees with the ABI and ISA. */ if (opts->gp == 64 && !ISA_HAS_64BIT_REGS (opts->isa)) as_bad (_("`gp=64' used with a 32-bit processor")); else if (abi_checks && opts->gp == 32 && ABI_NEEDS_64BIT_REGS (mips_abi)) as_bad (_("`gp=32' used with a 64-bit ABI")); else if (abi_checks && opts->gp == 64 && ABI_NEEDS_32BIT_REGS (mips_abi)) as_bad (_("`gp=64' used with a 32-bit ABI")); /* Check the size of the float registers agrees with the ABI and ISA. */ switch (opts->fp) { case 0: if (!CPU_HAS_LDC1_SDC1 (opts->arch)) as_bad (_("`fp=xx' used with a cpu lacking ldc1/sdc1 instructions")); else if (opts->single_float == 1) as_bad (_("`fp=xx' cannot be used with `singlefloat'")); break; case 64: if (!ISA_HAS_64BIT_FPRS (opts->isa)) as_bad (_("`fp=64' used with a 32-bit fpu")); else if (abi_checks && ABI_NEEDS_32BIT_REGS (mips_abi) && !ISA_HAS_MXHC1 (opts->isa)) as_warn (_("`fp=64' used with a 32-bit ABI")); break; case 32: if (abi_checks && ABI_NEEDS_64BIT_REGS (mips_abi)) as_warn (_("`fp=32' used with a 64-bit ABI")); if (ISA_IS_R6 (opts->isa) && opts->single_float == 0) as_bad (_("`fp=32' used with a MIPS R6 cpu")); break; default: as_bad (_("Unknown size of floating point registers")); break; } if (ABI_NEEDS_64BIT_REGS (mips_abi) && !opts->oddspreg) as_bad (_("`nooddspreg` cannot be used with a 64-bit ABI")); if (opts->micromips == 1 && opts->mips16 == 1) as_bad (_("`%s' cannot be used with `%s'"), "mips16", "micromips"); else if (ISA_IS_R6 (opts->isa) && (opts->micromips == 1 || opts->mips16 == 1)) as_fatal (_("`%s' cannot be used with `%s'"), opts->micromips ? "micromips" : "mips16", mips_cpu_info_from_isa (opts->isa)->name); if (ISA_IS_R6 (opts->isa) && mips_relax_branch) as_fatal (_("branch relaxation is not supported in `%s'"), mips_cpu_info_from_isa (opts->isa)->name); } /* Perform consistency checks on the module level options exactly once. This is a deferred check that happens: at the first .set directive or, at the first pseudo op that generates code (inc .dc.a) or, at the first instruction or, at the end. */ static void file_mips_check_options (void) { const struct mips_cpu_info *arch_info = 0; if (file_mips_opts_checked) return; /* The following code determines the register size. Similar code was added to GCC 3.3 (see override_options() in config/mips/mips.c). The GAS and GCC code should be kept in sync as much as possible. */ if (file_mips_opts.gp < 0) { /* Infer the integer register size from the ABI and processor. Restrict ourselves to 32-bit registers if that's all the processor has, or if the ABI cannot handle 64-bit registers. */ file_mips_opts.gp = (ABI_NEEDS_32BIT_REGS (mips_abi) || !ISA_HAS_64BIT_REGS (file_mips_opts.isa)) ? 32 : 64; } if (file_mips_opts.fp < 0) { /* No user specified float register size. ??? GAS treats single-float processors as though they had 64-bit float registers (although it complains when double-precision instructions are used). As things stand, saying they have 32-bit registers would lead to spurious "register must be even" messages. So here we assume float registers are never smaller than the integer ones. */ if (file_mips_opts.gp == 64) /* 64-bit integer registers implies 64-bit float registers. */ file_mips_opts.fp = 64; else if ((file_mips_opts.ase & FP64_ASES) && ISA_HAS_64BIT_FPRS (file_mips_opts.isa)) /* Handle ASEs that require 64-bit float registers, if possible. */ file_mips_opts.fp = 64; else if (ISA_IS_R6 (mips_opts.isa)) /* R6 implies 64-bit float registers. */ file_mips_opts.fp = 64; else /* 32-bit float registers. */ file_mips_opts.fp = 32; } arch_info = mips_cpu_info_from_arch (file_mips_opts.arch); /* Disable operations on odd-numbered floating-point registers by default when using the FPXX ABI. */ if (file_mips_opts.oddspreg < 0) { if (file_mips_opts.fp == 0) file_mips_opts.oddspreg = 0; else file_mips_opts.oddspreg = 1; } /* End of GCC-shared inference code. */ /* This flag is set when we have a 64-bit capable CPU but use only 32-bit wide registers. Note that EABI does not use it. */ if (ISA_HAS_64BIT_REGS (file_mips_opts.isa) && ((mips_abi == NO_ABI && file_mips_opts.gp == 32) || mips_abi == O32_ABI)) mips_32bitmode = 1; if (file_mips_opts.isa == ISA_MIPS1 && mips_trap) as_bad (_("trap exception not supported at ISA 1")); /* If the selected architecture includes support for ASEs, enable generation of code for them. */ if (file_mips_opts.mips16 == -1) file_mips_opts.mips16 = (CPU_HAS_MIPS16 (file_mips_opts.arch)) ? 1 : 0; if (file_mips_opts.micromips == -1) file_mips_opts.micromips = (CPU_HAS_MICROMIPS (file_mips_opts.arch)) ? 1 : 0; if (mips_nan2008 == -1) mips_nan2008 = (ISA_HAS_LEGACY_NAN (file_mips_opts.isa)) ? 0 : 1; else if (!ISA_HAS_LEGACY_NAN (file_mips_opts.isa) && mips_nan2008 == 0) as_fatal (_("`%s' does not support legacy NaN"), mips_cpu_info_from_arch (file_mips_opts.arch)->name); /* Some ASEs require 64-bit FPRs, so -mfp32 should stop those ASEs from being selected implicitly. */ if (file_mips_opts.fp != 64) file_ase_explicit |= ASE_MIPS3D | ASE_MDMX | ASE_MSA; /* If the user didn't explicitly select or deselect a particular ASE, use the default setting for the CPU. */ file_mips_opts.ase |= (arch_info->ase & ~file_ase_explicit); /* Set up the current options. These may change throughout assembly. */ mips_opts = file_mips_opts; mips_check_isa_supports_ases (); mips_check_options (&file_mips_opts, TRUE); file_mips_opts_checked = TRUE; if (!bfd_set_arch_mach (stdoutput, bfd_arch_mips, file_mips_opts.arch)) as_warn (_("could not set architecture and machine")); } void md_assemble (char *str) { struct mips_cl_insn insn; bfd_reloc_code_real_type unused_reloc[3] = {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED}; file_mips_check_options (); imm_expr.X_op = O_absent; offset_expr.X_op = O_absent; offset_reloc[0] = BFD_RELOC_UNUSED; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; mips_mark_labels (); mips_assembling_insn = TRUE; clear_insn_error (); if (mips_opts.mips16) mips16_ip (str, &insn); else { mips_ip (str, &insn); DBG ((_("returned from mips_ip(%s) insn_opcode = 0x%x\n"), str, insn.insn_opcode)); } if (insn_error.msg) report_insn_error (str); else if (insn.insn_mo->pinfo == INSN_MACRO) { macro_start (); if (mips_opts.mips16) mips16_macro (&insn); else macro (&insn, str); macro_end (); } else { if (offset_expr.X_op != O_absent) append_insn (&insn, &offset_expr, offset_reloc, FALSE); else append_insn (&insn, NULL, unused_reloc, FALSE); } mips_assembling_insn = FALSE; } /* Convenience functions for abstracting away the differences between MIPS16 and non-MIPS16 relocations. */ static inline bfd_boolean mips16_reloc_p (bfd_reloc_code_real_type reloc) { switch (reloc) { case BFD_RELOC_MIPS16_JMP: case BFD_RELOC_MIPS16_GPREL: case BFD_RELOC_MIPS16_GOT16: case BFD_RELOC_MIPS16_CALL16: case BFD_RELOC_MIPS16_HI16_S: case BFD_RELOC_MIPS16_HI16: case BFD_RELOC_MIPS16_LO16: case BFD_RELOC_MIPS16_16_PCREL_S1: return TRUE; default: return FALSE; } } static inline bfd_boolean micromips_reloc_p (bfd_reloc_code_real_type reloc) { switch (reloc) { case BFD_RELOC_MICROMIPS_7_PCREL_S1: case BFD_RELOC_MICROMIPS_10_PCREL_S1: case BFD_RELOC_MICROMIPS_16_PCREL_S1: case BFD_RELOC_MICROMIPS_GPREL16: case BFD_RELOC_MICROMIPS_JMP: case BFD_RELOC_MICROMIPS_HI16: case BFD_RELOC_MICROMIPS_HI16_S: case BFD_RELOC_MICROMIPS_LO16: case BFD_RELOC_MICROMIPS_LITERAL: case BFD_RELOC_MICROMIPS_GOT16: case BFD_RELOC_MICROMIPS_CALL16: case BFD_RELOC_MICROMIPS_GOT_HI16: case BFD_RELOC_MICROMIPS_GOT_LO16: case BFD_RELOC_MICROMIPS_CALL_HI16: case BFD_RELOC_MICROMIPS_CALL_LO16: case BFD_RELOC_MICROMIPS_SUB: case BFD_RELOC_MICROMIPS_GOT_PAGE: case BFD_RELOC_MICROMIPS_GOT_OFST: case BFD_RELOC_MICROMIPS_GOT_DISP: case BFD_RELOC_MICROMIPS_HIGHEST: case BFD_RELOC_MICROMIPS_HIGHER: case BFD_RELOC_MICROMIPS_SCN_DISP: case BFD_RELOC_MICROMIPS_JALR: return TRUE; default: return FALSE; } } static inline bfd_boolean jmp_reloc_p (bfd_reloc_code_real_type reloc) { return reloc == BFD_RELOC_MIPS_JMP || reloc == BFD_RELOC_MICROMIPS_JMP; } static inline bfd_boolean b_reloc_p (bfd_reloc_code_real_type reloc) { return (reloc == BFD_RELOC_MIPS_26_PCREL_S2 || reloc == BFD_RELOC_MIPS_21_PCREL_S2 || reloc == BFD_RELOC_16_PCREL_S2 || reloc == BFD_RELOC_MIPS16_16_PCREL_S1 || reloc == BFD_RELOC_MICROMIPS_16_PCREL_S1 || reloc == BFD_RELOC_MICROMIPS_10_PCREL_S1 || reloc == BFD_RELOC_MICROMIPS_7_PCREL_S1); } static inline bfd_boolean got16_reloc_p (bfd_reloc_code_real_type reloc) { return (reloc == BFD_RELOC_MIPS_GOT16 || reloc == BFD_RELOC_MIPS16_GOT16 || reloc == BFD_RELOC_MICROMIPS_GOT16); } static inline bfd_boolean hi16_reloc_p (bfd_reloc_code_real_type reloc) { return (reloc == BFD_RELOC_HI16_S || reloc == BFD_RELOC_MIPS16_HI16_S || reloc == BFD_RELOC_MICROMIPS_HI16_S); } static inline bfd_boolean lo16_reloc_p (bfd_reloc_code_real_type reloc) { return (reloc == BFD_RELOC_LO16 || reloc == BFD_RELOC_MIPS16_LO16 || reloc == BFD_RELOC_MICROMIPS_LO16); } static inline bfd_boolean jalr_reloc_p (bfd_reloc_code_real_type reloc) { return reloc == BFD_RELOC_MIPS_JALR || reloc == BFD_RELOC_MICROMIPS_JALR; } static inline bfd_boolean gprel16_reloc_p (bfd_reloc_code_real_type reloc) { return (reloc == BFD_RELOC_GPREL16 || reloc == BFD_RELOC_MIPS16_GPREL || reloc == BFD_RELOC_MICROMIPS_GPREL16); } /* Return true if RELOC is a PC-relative relocation that does not have full address range. */ static inline bfd_boolean limited_pcrel_reloc_p (bfd_reloc_code_real_type reloc) { switch (reloc) { case BFD_RELOC_16_PCREL_S2: case BFD_RELOC_MIPS16_16_PCREL_S1: case BFD_RELOC_MICROMIPS_7_PCREL_S1: case BFD_RELOC_MICROMIPS_10_PCREL_S1: case BFD_RELOC_MICROMIPS_16_PCREL_S1: case BFD_RELOC_MIPS_21_PCREL_S2: case BFD_RELOC_MIPS_26_PCREL_S2: case BFD_RELOC_MIPS_18_PCREL_S3: case BFD_RELOC_MIPS_19_PCREL_S2: return TRUE; case BFD_RELOC_32_PCREL: case BFD_RELOC_HI16_S_PCREL: case BFD_RELOC_LO16_PCREL: return HAVE_64BIT_ADDRESSES; default: return FALSE; } } /* Return true if the given relocation might need a matching %lo(). This is only "might" because SVR4 R_MIPS_GOT16 relocations only need a matching %lo() when applied to local symbols. */ static inline bfd_boolean reloc_needs_lo_p (bfd_reloc_code_real_type reloc) { return (HAVE_IN_PLACE_ADDENDS && (hi16_reloc_p (reloc) /* VxWorks R_MIPS_GOT16 relocs never need a matching %lo(); all GOT16 relocations evaluate to "G". */ || (got16_reloc_p (reloc) && mips_pic != VXWORKS_PIC))); } /* Return the type of %lo() reloc needed by RELOC, given that reloc_needs_lo_p. */ static inline bfd_reloc_code_real_type matching_lo_reloc (bfd_reloc_code_real_type reloc) { return (mips16_reloc_p (reloc) ? BFD_RELOC_MIPS16_LO16 : (micromips_reloc_p (reloc) ? BFD_RELOC_MICROMIPS_LO16 : BFD_RELOC_LO16)); } /* Return true if the given fixup is followed by a matching R_MIPS_LO16 relocation. */ static inline bfd_boolean fixup_has_matching_lo_p (fixS *fixp) { return (fixp->fx_next != NULL && fixp->fx_next->fx_r_type == matching_lo_reloc (fixp->fx_r_type) && fixp->fx_addsy == fixp->fx_next->fx_addsy && fixp->fx_offset == fixp->fx_next->fx_offset); } /* Move all labels in LABELS to the current insertion point. TEXT_P says whether the labels refer to text or data. */ static void mips_move_labels (struct insn_label_list *labels, bfd_boolean text_p) { struct insn_label_list *l; valueT val; for (l = labels; l != NULL; l = l->next) { gas_assert (S_GET_SEGMENT (l->label) == now_seg); symbol_set_frag (l->label, frag_now); val = (valueT) frag_now_fix (); /* MIPS16/microMIPS text labels are stored as odd. */ if (text_p && HAVE_CODE_COMPRESSION) ++val; S_SET_VALUE (l->label, val); } } /* Move all labels in insn_labels to the current insertion point and treat them as text labels. */ static void mips_move_text_labels (void) { mips_move_labels (seg_info (now_seg)->label_list, TRUE); } static bfd_boolean s_is_linkonce (symbolS *sym, segT from_seg) { bfd_boolean linkonce = FALSE; segT symseg = S_GET_SEGMENT (sym); if (symseg != from_seg && !S_IS_LOCAL (sym)) { if ((bfd_get_section_flags (stdoutput, symseg) & SEC_LINK_ONCE)) linkonce = TRUE; /* The GNU toolchain uses an extension for ELF: a section beginning with the magic string .gnu.linkonce is a linkonce section. */ if (strncmp (segment_name (symseg), ".gnu.linkonce", sizeof ".gnu.linkonce" - 1) == 0) linkonce = TRUE; } return linkonce; } /* Mark MIPS16 or microMIPS instruction label LABEL. This permits the linker to handle them specially, such as generating jalx instructions when needed. We also make them odd for the duration of the assembly, in order to generate the right sort of code. We will make them even in the adjust_symtab routine, while leaving them marked. This is convenient for the debugger and the disassembler. The linker knows to make them odd again. */ static void mips_compressed_mark_label (symbolS *label) { gas_assert (HAVE_CODE_COMPRESSION); if (mips_opts.mips16) S_SET_OTHER (label, ELF_ST_SET_MIPS16 (S_GET_OTHER (label))); else S_SET_OTHER (label, ELF_ST_SET_MICROMIPS (S_GET_OTHER (label))); if ((S_GET_VALUE (label) & 1) == 0 /* Don't adjust the address if the label is global or weak, or in a link-once section, since we'll be emitting symbol reloc references to it which will be patched up by the linker, and the final value of the symbol may or may not be MIPS16/microMIPS. */ && !S_IS_WEAK (label) && !S_IS_EXTERNAL (label) && !s_is_linkonce (label, now_seg)) S_SET_VALUE (label, S_GET_VALUE (label) | 1); } /* Mark preceding MIPS16 or microMIPS instruction labels. */ static void mips_compressed_mark_labels (void) { struct insn_label_list *l; for (l = seg_info (now_seg)->label_list; l != NULL; l = l->next) mips_compressed_mark_label (l->label); } /* End the current frag. Make it a variant frag and record the relaxation info. */ static void relax_close_frag (void) { mips_macro_warning.first_frag = frag_now; frag_var (rs_machine_dependent, 0, 0, RELAX_ENCODE (mips_relax.sizes[0], mips_relax.sizes[1]), mips_relax.symbol, 0, (char *) mips_relax.first_fixup); memset (&mips_relax.sizes, 0, sizeof (mips_relax.sizes)); mips_relax.first_fixup = 0; } /* Start a new relaxation sequence whose expansion depends on SYMBOL. See the comment above RELAX_ENCODE for more details. */ static void relax_start (symbolS *symbol) { gas_assert (mips_relax.sequence == 0); mips_relax.sequence = 1; mips_relax.symbol = symbol; } /* Start generating the second version of a relaxable sequence. See the comment above RELAX_ENCODE for more details. */ static void relax_switch (void) { gas_assert (mips_relax.sequence == 1); mips_relax.sequence = 2; } /* End the current relaxable sequence. */ static void relax_end (void) { gas_assert (mips_relax.sequence == 2); relax_close_frag (); mips_relax.sequence = 0; } /* Return true if IP is a delayed branch or jump. */ static inline bfd_boolean delayed_branch_p (const struct mips_cl_insn *ip) { return (ip->insn_mo->pinfo & (INSN_UNCOND_BRANCH_DELAY | INSN_COND_BRANCH_DELAY | INSN_COND_BRANCH_LIKELY)) != 0; } /* Return true if IP is a compact branch or jump. */ static inline bfd_boolean compact_branch_p (const struct mips_cl_insn *ip) { return (ip->insn_mo->pinfo2 & (INSN2_UNCOND_BRANCH | INSN2_COND_BRANCH)) != 0; } /* Return true if IP is an unconditional branch or jump. */ static inline bfd_boolean uncond_branch_p (const struct mips_cl_insn *ip) { return ((ip->insn_mo->pinfo & INSN_UNCOND_BRANCH_DELAY) != 0 || (ip->insn_mo->pinfo2 & INSN2_UNCOND_BRANCH) != 0); } /* Return true if IP is a branch-likely instruction. */ static inline bfd_boolean branch_likely_p (const struct mips_cl_insn *ip) { return (ip->insn_mo->pinfo & INSN_COND_BRANCH_LIKELY) != 0; } /* Return the type of nop that should be used to fill the delay slot of delayed branch IP. */ static struct mips_cl_insn * get_delay_slot_nop (const struct mips_cl_insn *ip) { if (mips_opts.micromips && (ip->insn_mo->pinfo2 & INSN2_BRANCH_DELAY_32BIT)) return &micromips_nop32_insn; return NOP_INSN; } /* Return a mask that has bit N set if OPCODE reads the register(s) in operand N. */ static unsigned int insn_read_mask (const struct mips_opcode *opcode) { return (opcode->pinfo & INSN_READ_ALL) >> INSN_READ_SHIFT; } /* Return a mask that has bit N set if OPCODE writes to the register(s) in operand N. */ static unsigned int insn_write_mask (const struct mips_opcode *opcode) { return (opcode->pinfo & INSN_WRITE_ALL) >> INSN_WRITE_SHIFT; } /* Return a mask of the registers specified by operand OPERAND of INSN. Ignore registers of type OP_REG_<t> unless bit OP_REG_<t> of TYPE_MASK is set. */ static unsigned int operand_reg_mask (const struct mips_cl_insn *insn, const struct mips_operand *operand, unsigned int type_mask) { unsigned int uval, vsel; switch (operand->type) { case OP_INT: case OP_MAPPED_INT: case OP_MSB: case OP_PCREL: case OP_PERF_REG: case OP_ADDIUSP_INT: case OP_ENTRY_EXIT_LIST: case OP_REPEAT_DEST_REG: case OP_REPEAT_PREV_REG: case OP_PC: case OP_VU0_SUFFIX: case OP_VU0_MATCH_SUFFIX: case OP_IMM_INDEX: abort (); case OP_REG: case OP_OPTIONAL_REG: { const struct mips_reg_operand *reg_op; reg_op = (const struct mips_reg_operand *) operand; if (!(type_mask & (1 << reg_op->reg_type))) return 0; uval = insn_extract_operand (insn, operand); return 1 << mips_decode_reg_operand (reg_op, uval); } case OP_REG_PAIR: { const struct mips_reg_pair_operand *pair_op; pair_op = (const struct mips_reg_pair_operand *) operand; if (!(type_mask & (1 << pair_op->reg_type))) return 0; uval = insn_extract_operand (insn, operand); return (1 << pair_op->reg1_map[uval]) | (1 << pair_op->reg2_map[uval]); } case OP_CLO_CLZ_DEST: if (!(type_mask & (1 << OP_REG_GP))) return 0; uval = insn_extract_operand (insn, operand); return (1 << (uval & 31)) | (1 << (uval >> 5)); case OP_SAME_RS_RT: if (!(type_mask & (1 << OP_REG_GP))) return 0; uval = insn_extract_operand (insn, operand); gas_assert ((uval & 31) == (uval >> 5)); return 1 << (uval & 31); case OP_CHECK_PREV: case OP_NON_ZERO_REG: if (!(type_mask & (1 << OP_REG_GP))) return 0; uval = insn_extract_operand (insn, operand); return 1 << (uval & 31); case OP_LWM_SWM_LIST: abort (); case OP_SAVE_RESTORE_LIST: abort (); case OP_MDMX_IMM_REG: if (!(type_mask & (1 << OP_REG_VEC))) return 0; uval = insn_extract_operand (insn, operand); vsel = uval >> 5; if ((vsel & 0x18) == 0x18) return 0; return 1 << (uval & 31); case OP_REG_INDEX: if (!(type_mask & (1 << OP_REG_GP))) return 0; return 1 << insn_extract_operand (insn, operand); } abort (); } /* Return a mask of the registers specified by operands OPNO_MASK of INSN, where bit N of OPNO_MASK is set if operand N should be included. Ignore registers of type OP_REG_<t> unless bit OP_REG_<t> of TYPE_MASK is set. */ static unsigned int insn_reg_mask (const struct mips_cl_insn *insn, unsigned int type_mask, unsigned int opno_mask) { unsigned int opno, reg_mask; opno = 0; reg_mask = 0; while (opno_mask != 0) { if (opno_mask & 1) reg_mask |= operand_reg_mask (insn, insn_opno (insn, opno), type_mask); opno_mask >>= 1; opno += 1; } return reg_mask; } /* Return the mask of core registers that IP reads. */ static unsigned int gpr_read_mask (const struct mips_cl_insn *ip) { unsigned long pinfo, pinfo2; unsigned int mask; mask = insn_reg_mask (ip, 1 << OP_REG_GP, insn_read_mask (ip->insn_mo)); pinfo = ip->insn_mo->pinfo; pinfo2 = ip->insn_mo->pinfo2; if (pinfo & INSN_UDI) { /* UDI instructions have traditionally been assumed to read RS and RT. */ mask |= 1 << EXTRACT_OPERAND (mips_opts.micromips, RT, *ip); mask |= 1 << EXTRACT_OPERAND (mips_opts.micromips, RS, *ip); } if (pinfo & INSN_READ_GPR_24) mask |= 1 << 24; if (pinfo2 & INSN2_READ_GPR_16) mask |= 1 << 16; if (pinfo2 & INSN2_READ_SP) mask |= 1 << SP; if (pinfo2 & INSN2_READ_GPR_31) mask |= 1 << 31; /* Don't include register 0. */ return mask & ~1; } /* Return the mask of core registers that IP writes. */ static unsigned int gpr_write_mask (const struct mips_cl_insn *ip) { unsigned long pinfo, pinfo2; unsigned int mask; mask = insn_reg_mask (ip, 1 << OP_REG_GP, insn_write_mask (ip->insn_mo)); pinfo = ip->insn_mo->pinfo; pinfo2 = ip->insn_mo->pinfo2; if (pinfo & INSN_WRITE_GPR_24) mask |= 1 << 24; if (pinfo & INSN_WRITE_GPR_31) mask |= 1 << 31; if (pinfo & INSN_UDI) /* UDI instructions have traditionally been assumed to write to RD. */ mask |= 1 << EXTRACT_OPERAND (mips_opts.micromips, RD, *ip); if (pinfo2 & INSN2_WRITE_SP) mask |= 1 << SP; /* Don't include register 0. */ return mask & ~1; } /* Return the mask of floating-point registers that IP reads. */ static unsigned int fpr_read_mask (const struct mips_cl_insn *ip) { unsigned long pinfo; unsigned int mask; mask = insn_reg_mask (ip, ((1 << OP_REG_FP) | (1 << OP_REG_VEC) | (1 << OP_REG_MSA)), insn_read_mask (ip->insn_mo)); pinfo = ip->insn_mo->pinfo; /* Conservatively treat all operands to an FP_D instruction are doubles. (This is overly pessimistic for things like cvt.d.s.) */ if (FPR_SIZE != 64 && (pinfo & FP_D)) mask |= mask << 1; return mask; } /* Return the mask of floating-point registers that IP writes. */ static unsigned int fpr_write_mask (const struct mips_cl_insn *ip) { unsigned long pinfo; unsigned int mask; mask = insn_reg_mask (ip, ((1 << OP_REG_FP) | (1 << OP_REG_VEC) | (1 << OP_REG_MSA)), insn_write_mask (ip->insn_mo)); pinfo = ip->insn_mo->pinfo; /* Conservatively treat all operands to an FP_D instruction are doubles. (This is overly pessimistic for things like cvt.s.d.) */ if (FPR_SIZE != 64 && (pinfo & FP_D)) mask |= mask << 1; return mask; } /* Operand OPNUM of INSN is an odd-numbered floating-point register. Check whether that is allowed. */ static bfd_boolean mips_oddfpreg_ok (const struct mips_opcode *insn, int opnum) { const char *s = insn->name; bfd_boolean oddspreg = (ISA_HAS_ODD_SINGLE_FPR (mips_opts.isa, mips_opts.arch) || FPR_SIZE == 64) && mips_opts.oddspreg; if (insn->pinfo == INSN_MACRO) /* Let a macro pass, we'll catch it later when it is expanded. */ return TRUE; /* Single-precision coprocessor loads and moves are OK for 32-bit registers, otherwise it depends on oddspreg. */ if ((insn->pinfo & FP_S) && (insn->pinfo & (INSN_LOAD_MEMORY | INSN_STORE_MEMORY | INSN_LOAD_COPROC | INSN_COPROC_MOVE))) return FPR_SIZE == 32 || oddspreg; /* Allow odd registers for single-precision ops and double-precision if the floating-point registers are 64-bit wide. */ switch (insn->pinfo & (FP_S | FP_D)) { case FP_S: case 0: return oddspreg; case FP_D: return FPR_SIZE == 64; default: break; } /* Cvt.w.x and cvt.x.w allow an odd register for a 'w' or 's' operand. */ s = strchr (insn->name, '.'); if (s != NULL && opnum == 2) s = strchr (s + 1, '.'); if (s != NULL && (s[1] == 'w' || s[1] == 's')) return oddspreg; return FPR_SIZE == 64; } /* Information about an instruction argument that we're trying to match. */ struct mips_arg_info { /* The instruction so far. */ struct mips_cl_insn *insn; /* The first unconsumed operand token. */ struct mips_operand_token *token; /* The 1-based operand number, in terms of insn->insn_mo->args. */ int opnum; /* The 1-based argument number, for error reporting. This does not count elided optional registers, etc.. */ int argnum; /* The last OP_REG operand seen, or ILLEGAL_REG if none. */ unsigned int last_regno; /* If the first operand was an OP_REG, this is the register that it specified, otherwise it is ILLEGAL_REG. */ unsigned int dest_regno; /* The value of the last OP_INT operand. Only used for OP_MSB, where it gives the lsb position. */ unsigned int last_op_int; /* If true, match routines should assume that no later instruction alternative matches and should therefore be as accommodating as possible. Match routines should not report errors if something is only invalid for !LAX_MATCH. */ bfd_boolean lax_match; /* True if a reference to the current AT register was seen. */ bfd_boolean seen_at; }; /* Record that the argument is out of range. */ static void match_out_of_range (struct mips_arg_info *arg) { set_insn_error_i (arg->argnum, _("operand %d out of range"), arg->argnum); } /* Record that the argument isn't constant but needs to be. */ static void match_not_constant (struct mips_arg_info *arg) { set_insn_error_i (arg->argnum, _("operand %d must be constant"), arg->argnum); } /* Try to match an OT_CHAR token for character CH. Consume the token and return true on success, otherwise return false. */ static bfd_boolean match_char (struct mips_arg_info *arg, char ch) { if (arg->token->type == OT_CHAR && arg->token->u.ch == ch) { ++arg->token; if (ch == ',') arg->argnum += 1; return TRUE; } return FALSE; } /* Try to get an expression from the next tokens in ARG. Consume the tokens and return true on success, storing the expression value in VALUE and relocation types in R. */ static bfd_boolean match_expression (struct mips_arg_info *arg, expressionS *value, bfd_reloc_code_real_type *r) { /* If the next token is a '(' that was parsed as being part of a base expression, assume we have an elided offset. The later match will fail if this turns out to be wrong. */ if (arg->token->type == OT_CHAR && arg->token->u.ch == '(') { value->X_op = O_constant; value->X_add_number = 0; r[0] = r[1] = r[2] = BFD_RELOC_UNUSED; return TRUE; } /* Reject register-based expressions such as "0+$2" and "(($2))". For plain registers the default error seems more appropriate. */ if (arg->token->type == OT_INTEGER && arg->token->u.integer.value.X_op == O_register) { set_insn_error (arg->argnum, _("register value used as expression")); return FALSE; } if (arg->token->type == OT_INTEGER) { *value = arg->token->u.integer.value; memcpy (r, arg->token->u.integer.relocs, 3 * sizeof (*r)); ++arg->token; return TRUE; } set_insn_error_i (arg->argnum, _("operand %d must be an immediate expression"), arg->argnum); return FALSE; } /* Try to get a constant expression from the next tokens in ARG. Consume the tokens and return return true on success, storing the constant value in *VALUE. Use FALLBACK as the value if the match succeeded with an error. */ static bfd_boolean match_const_int (struct mips_arg_info *arg, offsetT *value) { expressionS ex; bfd_reloc_code_real_type r[3]; if (!match_expression (arg, &ex, r)) return FALSE; if (r[0] == BFD_RELOC_UNUSED && ex.X_op == O_constant) *value = ex.X_add_number; else { match_not_constant (arg); return FALSE; } return TRUE; } /* Return the RTYPE_* flags for a register operand of type TYPE that appears in instruction OPCODE. */ static unsigned int convert_reg_type (const struct mips_opcode *opcode, enum mips_reg_operand_type type) { switch (type) { case OP_REG_GP: return RTYPE_NUM | RTYPE_GP; case OP_REG_FP: /* Allow vector register names for MDMX if the instruction is a 64-bit FPR load, store or move (including moves to and from GPRs). */ if ((mips_opts.ase & ASE_MDMX) && (opcode->pinfo & FP_D) && (opcode->pinfo & (INSN_COPROC_MOVE | INSN_COPROC_MEMORY_DELAY | INSN_LOAD_COPROC | INSN_LOAD_MEMORY | INSN_STORE_MEMORY))) return RTYPE_FPU | RTYPE_VEC; return RTYPE_FPU; case OP_REG_CCC: if (opcode->pinfo & (FP_D | FP_S)) return RTYPE_CCC | RTYPE_FCC; return RTYPE_CCC; case OP_REG_VEC: if (opcode->membership & INSN_5400) return RTYPE_FPU; return RTYPE_FPU | RTYPE_VEC; case OP_REG_ACC: return RTYPE_ACC; case OP_REG_COPRO: if (opcode->name[strlen (opcode->name) - 1] == '0') return RTYPE_NUM | RTYPE_CP0; return RTYPE_NUM; case OP_REG_HW: return RTYPE_NUM; case OP_REG_VI: return RTYPE_NUM | RTYPE_VI; case OP_REG_VF: return RTYPE_NUM | RTYPE_VF; case OP_REG_R5900_I: return RTYPE_R5900_I; case OP_REG_R5900_Q: return RTYPE_R5900_Q; case OP_REG_R5900_R: return RTYPE_R5900_R; case OP_REG_R5900_ACC: return RTYPE_R5900_ACC; case OP_REG_MSA: return RTYPE_MSA; case OP_REG_MSA_CTRL: return RTYPE_NUM; } abort (); } /* ARG is register REGNO, of type TYPE. Warn about any dubious registers. */ static void check_regno (struct mips_arg_info *arg, enum mips_reg_operand_type type, unsigned int regno) { if (AT && type == OP_REG_GP && regno == AT) arg->seen_at = TRUE; if (type == OP_REG_FP && (regno & 1) != 0 && !mips_oddfpreg_ok (arg->insn->insn_mo, arg->opnum)) { /* This was a warning prior to introducing O32 FPXX and FP64 support so maintain a warning for FP32 but raise an error for the new cases. */ if (FPR_SIZE == 32) as_warn (_("float register should be even, was %d"), regno); else as_bad (_("float register should be even, was %d"), regno); } if (type == OP_REG_CCC) { const char *name; size_t length; name = arg->insn->insn_mo->name; length = strlen (name); if ((regno & 1) != 0 && ((length >= 3 && strcmp (name + length - 3, ".ps") == 0) || (length >= 5 && strncmp (name + length - 5, "any2", 4) == 0))) as_warn (_("condition code register should be even for %s, was %d"), name, regno); if ((regno & 3) != 0 && (length >= 5 && strncmp (name + length - 5, "any4", 4) == 0)) as_warn (_("condition code register should be 0 or 4 for %s, was %d"), name, regno); } } /* ARG is a register with symbol value SYMVAL. Try to interpret it as a register of type TYPE. Return true on success, storing the register number in *REGNO and warning about any dubious uses. */ static bfd_boolean match_regno (struct mips_arg_info *arg, enum mips_reg_operand_type type, unsigned int symval, unsigned int *regno) { if (type == OP_REG_VEC) symval = mips_prefer_vec_regno (symval); if (!(symval & convert_reg_type (arg->insn->insn_mo, type))) return FALSE; *regno = symval & RNUM_MASK; check_regno (arg, type, *regno); return TRUE; } /* Try to interpret the next token in ARG as a register of type TYPE. Consume the token and return true on success, storing the register number in *REGNO. Return false on failure. */ static bfd_boolean match_reg (struct mips_arg_info *arg, enum mips_reg_operand_type type, unsigned int *regno) { if (arg->token->type == OT_REG && match_regno (arg, type, arg->token->u.regno, regno)) { ++arg->token; return TRUE; } return FALSE; } /* Try to interpret the next token in ARG as a range of registers of type TYPE. Consume the token and return true on success, storing the register numbers in *REGNO1 and *REGNO2. Return false on failure. */ static bfd_boolean match_reg_range (struct mips_arg_info *arg, enum mips_reg_operand_type type, unsigned int *regno1, unsigned int *regno2) { if (match_reg (arg, type, regno1)) { *regno2 = *regno1; return TRUE; } if (arg->token->type == OT_REG_RANGE && match_regno (arg, type, arg->token->u.reg_range.regno1, regno1) && match_regno (arg, type, arg->token->u.reg_range.regno2, regno2) && *regno1 <= *regno2) { ++arg->token; return TRUE; } return FALSE; } /* OP_INT matcher. */ static bfd_boolean match_int_operand (struct mips_arg_info *arg, const struct mips_operand *operand_base) { const struct mips_int_operand *operand; unsigned int uval; int min_val, max_val, factor; offsetT sval; operand = (const struct mips_int_operand *) operand_base; factor = 1 << operand->shift; min_val = mips_int_operand_min (operand); max_val = mips_int_operand_max (operand); if (operand_base->lsb == 0 && operand_base->size == 16 && operand->shift == 0 && operand->bias == 0 && (operand->max_val == 32767 || operand->max_val == 65535)) { /* The operand can be relocated. */ if (!match_expression (arg, &offset_expr, offset_reloc)) return FALSE; if (offset_reloc[0] != BFD_RELOC_UNUSED) /* Relocation operators were used. Accept the arguent and leave the relocation value in offset_expr and offset_relocs for the caller to process. */ return TRUE; if (offset_expr.X_op != O_constant) { /* Accept non-constant operands if no later alternative matches, leaving it for the caller to process. */ if (!arg->lax_match) return FALSE; offset_reloc[0] = BFD_RELOC_LO16; return TRUE; } /* Clear the global state; we're going to install the operand ourselves. */ sval = offset_expr.X_add_number; offset_expr.X_op = O_absent; /* For compatibility with older assemblers, we accept 0x8000-0xffff as signed 16-bit numbers when only signed numbers are allowed. */ if (sval > max_val) { max_val = ((1 << operand_base->size) - 1) << operand->shift; if (!arg->lax_match && sval <= max_val) return FALSE; } } else { if (!match_const_int (arg, &sval)) return FALSE; } arg->last_op_int = sval; if (sval < min_val || sval > max_val || sval % factor) { match_out_of_range (arg); return FALSE; } uval = (unsigned int) sval >> operand->shift; uval -= operand->bias; /* Handle -mfix-cn63xxp1. */ if (arg->opnum == 1 && mips_fix_cn63xxp1 && !mips_opts.micromips && strcmp ("pref", arg->insn->insn_mo->name) == 0) switch (uval) { case 5: case 25: case 26: case 27: case 28: case 29: case 30: case 31: /* These are ok. */ break; default: /* The rest must be changed to 28. */ uval = 28; break; } insn_insert_operand (arg->insn, operand_base, uval); return TRUE; } /* OP_MAPPED_INT matcher. */ static bfd_boolean match_mapped_int_operand (struct mips_arg_info *arg, const struct mips_operand *operand_base) { const struct mips_mapped_int_operand *operand; unsigned int uval, num_vals; offsetT sval; operand = (const struct mips_mapped_int_operand *) operand_base; if (!match_const_int (arg, &sval)) return FALSE; num_vals = 1 << operand_base->size; for (uval = 0; uval < num_vals; uval++) if (operand->int_map[uval] == sval) break; if (uval == num_vals) { match_out_of_range (arg); return FALSE; } insn_insert_operand (arg->insn, operand_base, uval); return TRUE; } /* OP_MSB matcher. */ static bfd_boolean match_msb_operand (struct mips_arg_info *arg, const struct mips_operand *operand_base) { const struct mips_msb_operand *operand; int min_val, max_val, max_high; offsetT size, sval, high; operand = (const struct mips_msb_operand *) operand_base; min_val = operand->bias; max_val = min_val + (1 << operand_base->size) - 1; max_high = operand->opsize; if (!match_const_int (arg, &size)) return FALSE; high = size + arg->last_op_int; sval = operand->add_lsb ? high : size; if (size < 0 || high > max_high || sval < min_val || sval > max_val) { match_out_of_range (arg); return FALSE; } insn_insert_operand (arg->insn, operand_base, sval - min_val); return TRUE; } /* OP_REG matcher. */ static bfd_boolean match_reg_operand (struct mips_arg_info *arg, const struct mips_operand *operand_base) { const struct mips_reg_operand *operand; unsigned int regno, uval, num_vals; operand = (const struct mips_reg_operand *) operand_base; if (!match_reg (arg, operand->reg_type, &regno)) return FALSE; if (operand->reg_map) { num_vals = 1 << operand->root.size; for (uval = 0; uval < num_vals; uval++) if (operand->reg_map[uval] == regno) break; if (num_vals == uval) return FALSE; } else uval = regno; arg->last_regno = regno; if (arg->opnum == 1) arg->dest_regno = regno; insn_insert_operand (arg->insn, operand_base, uval); return TRUE; } /* OP_REG_PAIR matcher. */ static bfd_boolean match_reg_pair_operand (struct mips_arg_info *arg, const struct mips_operand *operand_base) { const struct mips_reg_pair_operand *operand; unsigned int regno1, regno2, uval, num_vals; operand = (const struct mips_reg_pair_operand *) operand_base; if (!match_reg (arg, operand->reg_type, &regno1) || !match_char (arg, ',') || !match_reg (arg, operand->reg_type, &regno2)) return FALSE; num_vals = 1 << operand_base->size; for (uval = 0; uval < num_vals; uval++) if (operand->reg1_map[uval] == regno1 && operand->reg2_map[uval] == regno2) break; if (uval == num_vals) return FALSE; insn_insert_operand (arg->insn, operand_base, uval); return TRUE; } /* OP_PCREL matcher. The caller chooses the relocation type. */ static bfd_boolean match_pcrel_operand (struct mips_arg_info *arg) { bfd_reloc_code_real_type r[3]; return match_expression (arg, &offset_expr, r) && r[0] == BFD_RELOC_UNUSED; } /* OP_PERF_REG matcher. */ static bfd_boolean match_perf_reg_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { offsetT sval; if (!match_const_int (arg, &sval)) return FALSE; if (sval != 0 && (sval != 1 || (mips_opts.arch == CPU_R5900 && (strcmp (arg->insn->insn_mo->name, "mfps") == 0 || strcmp (arg->insn->insn_mo->name, "mtps") == 0)))) { set_insn_error (arg->argnum, _("invalid performance register")); return FALSE; } insn_insert_operand (arg->insn, operand, sval); return TRUE; } /* OP_ADDIUSP matcher. */ static bfd_boolean match_addiusp_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { offsetT sval; unsigned int uval; if (!match_const_int (arg, &sval)) return FALSE; if (sval % 4) { match_out_of_range (arg); return FALSE; } sval /= 4; if (!(sval >= -258 && sval <= 257) || (sval >= -2 && sval <= 1)) { match_out_of_range (arg); return FALSE; } uval = (unsigned int) sval; uval = ((uval >> 1) & ~0xff) | (uval & 0xff); insn_insert_operand (arg->insn, operand, uval); return TRUE; } /* OP_CLO_CLZ_DEST matcher. */ static bfd_boolean match_clo_clz_dest_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { unsigned int regno; if (!match_reg (arg, OP_REG_GP, &regno)) return FALSE; insn_insert_operand (arg->insn, operand, regno | (regno << 5)); return TRUE; } /* OP_CHECK_PREV matcher. */ static bfd_boolean match_check_prev_operand (struct mips_arg_info *arg, const struct mips_operand *operand_base) { const struct mips_check_prev_operand *operand; unsigned int regno; operand = (const struct mips_check_prev_operand *) operand_base; if (!match_reg (arg, OP_REG_GP, &regno)) return FALSE; if (!operand->zero_ok && regno == 0) return FALSE; if ((operand->less_than_ok && regno < arg->last_regno) || (operand->greater_than_ok && regno > arg->last_regno) || (operand->equal_ok && regno == arg->last_regno)) { arg->last_regno = regno; insn_insert_operand (arg->insn, operand_base, regno); return TRUE; } return FALSE; } /* OP_SAME_RS_RT matcher. */ static bfd_boolean match_same_rs_rt_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { unsigned int regno; if (!match_reg (arg, OP_REG_GP, &regno)) return FALSE; if (regno == 0) { set_insn_error (arg->argnum, _("the source register must not be $0")); return FALSE; } arg->last_regno = regno; insn_insert_operand (arg->insn, operand, regno | (regno << 5)); return TRUE; } /* OP_LWM_SWM_LIST matcher. */ static bfd_boolean match_lwm_swm_list_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { unsigned int reglist, sregs, ra, regno1, regno2; struct mips_arg_info reset; reglist = 0; if (!match_reg_range (arg, OP_REG_GP, &regno1, &regno2)) return FALSE; do { if (regno2 == FP && regno1 >= S0 && regno1 <= S7) { reglist |= 1 << FP; regno2 = S7; } reglist |= ((1U << regno2 << 1) - 1) & -(1U << regno1); reset = *arg; } while (match_char (arg, ',') && match_reg_range (arg, OP_REG_GP, &regno1, &regno2)); *arg = reset; if (operand->size == 2) { /* The list must include both ra and s0-sN, for 0 <= N <= 3. E.g.: s0, ra s0, s1, ra, s2, s3 s0-s2, ra and any permutations of these. */ if ((reglist & 0xfff1ffff) != 0x80010000) return FALSE; sregs = (reglist >> 17) & 7; ra = 0; } else { /* The list must include at least one of ra and s0-sN, for 0 <= N <= 8. (Note that there is a gap between s7 and s8, which are $23 and $30 respectively.) E.g.: ra s0 ra, s0, s1, s2 s0-s8 s0-s5, ra and any permutations of these. */ if ((reglist & 0x3f00ffff) != 0) return FALSE; ra = (reglist >> 27) & 0x10; sregs = ((reglist >> 22) & 0x100) | ((reglist >> 16) & 0xff); } sregs += 1; if ((sregs & -sregs) != sregs) return FALSE; insn_insert_operand (arg->insn, operand, (ffs (sregs) - 1) | ra); return TRUE; } /* OP_ENTRY_EXIT_LIST matcher. */ static unsigned int match_entry_exit_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { unsigned int mask; bfd_boolean is_exit; /* The format is the same for both ENTRY and EXIT, but the constraints are different. */ is_exit = strcmp (arg->insn->insn_mo->name, "exit") == 0; mask = (is_exit ? 7 << 3 : 0); do { unsigned int regno1, regno2; bfd_boolean is_freg; if (match_reg_range (arg, OP_REG_GP, &regno1, &regno2)) is_freg = FALSE; else if (match_reg_range (arg, OP_REG_FP, &regno1, &regno2)) is_freg = TRUE; else return FALSE; if (is_exit && is_freg && regno1 == 0 && regno2 < 2) { mask &= ~(7 << 3); mask |= (5 + regno2) << 3; } else if (!is_exit && regno1 == 4 && regno2 >= 4 && regno2 <= 7) mask |= (regno2 - 3) << 3; else if (regno1 == 16 && regno2 >= 16 && regno2 <= 17) mask |= (regno2 - 15) << 1; else if (regno1 == RA && regno2 == RA) mask |= 1; else return FALSE; } while (match_char (arg, ',')); insn_insert_operand (arg->insn, operand, mask); return TRUE; } /* OP_SAVE_RESTORE_LIST matcher. */ static bfd_boolean match_save_restore_list_operand (struct mips_arg_info *arg) { unsigned int opcode, args, statics, sregs; unsigned int num_frame_sizes, num_args, num_statics, num_sregs; offsetT frame_size; opcode = arg->insn->insn_opcode; frame_size = 0; num_frame_sizes = 0; args = 0; statics = 0; sregs = 0; do { unsigned int regno1, regno2; if (arg->token->type == OT_INTEGER) { /* Handle the frame size. */ if (!match_const_int (arg, &frame_size)) return FALSE; num_frame_sizes += 1; } else { if (!match_reg_range (arg, OP_REG_GP, &regno1, &regno2)) return FALSE; while (regno1 <= regno2) { if (regno1 >= 4 && regno1 <= 7) { if (num_frame_sizes == 0) /* args $a0-$a3 */ args |= 1 << (regno1 - 4); else /* statics $a0-$a3 */ statics |= 1 << (regno1 - 4); } else if (regno1 >= 16 && regno1 <= 23) /* $s0-$s7 */ sregs |= 1 << (regno1 - 16); else if (regno1 == 30) /* $s8 */ sregs |= 1 << 8; else if (regno1 == 31) /* Add $ra to insn. */ opcode |= 0x40; else return FALSE; regno1 += 1; if (regno1 == 24) regno1 = 30; } } } while (match_char (arg, ',')); /* Encode args/statics combination. */ if (args & statics) return FALSE; else if (args == 0xf) /* All $a0-$a3 are args. */ opcode |= MIPS16_ALL_ARGS << 16; else if (statics == 0xf) /* All $a0-$a3 are statics. */ opcode |= MIPS16_ALL_STATICS << 16; else { /* Count arg registers. */ num_args = 0; while (args & 0x1) { args >>= 1; num_args += 1; } if (args != 0) return FALSE; /* Count static registers. */ num_statics = 0; while (statics & 0x8) { statics = (statics << 1) & 0xf; num_statics += 1; } if (statics != 0) return FALSE; /* Encode args/statics. */ opcode |= ((num_args << 2) | num_statics) << 16; } /* Encode $s0/$s1. */ if (sregs & (1 << 0)) /* $s0 */ opcode |= 0x20; if (sregs & (1 << 1)) /* $s1 */ opcode |= 0x10; sregs >>= 2; /* Encode $s2-$s8. */ num_sregs = 0; while (sregs & 1) { sregs >>= 1; num_sregs += 1; } if (sregs != 0) return FALSE; opcode |= num_sregs << 24; /* Encode frame size. */ if (num_frame_sizes == 0) { set_insn_error (arg->argnum, _("missing frame size")); return FALSE; } if (num_frame_sizes > 1) { set_insn_error (arg->argnum, _("frame size specified twice")); return FALSE; } if ((frame_size & 7) != 0 || frame_size < 0 || frame_size > 0xff * 8) { set_insn_error (arg->argnum, _("invalid frame size")); return FALSE; } if (frame_size != 128 || (opcode >> 16) != 0) { frame_size /= 8; opcode |= (((frame_size & 0xf0) << 16) | (frame_size & 0x0f)); } /* Finally build the instruction. */ if ((opcode >> 16) != 0 || frame_size == 0) opcode |= MIPS16_EXTEND; arg->insn->insn_opcode = opcode; return TRUE; } /* OP_MDMX_IMM_REG matcher. */ static bfd_boolean match_mdmx_imm_reg_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { unsigned int regno, uval; bfd_boolean is_qh; const struct mips_opcode *opcode; /* The mips_opcode records whether this is an octobyte or quadhalf instruction. Start out with that bit in place. */ opcode = arg->insn->insn_mo; uval = mips_extract_operand (operand, opcode->match); is_qh = (uval != 0); if (arg->token->type == OT_REG) { if ((opcode->membership & INSN_5400) && strcmp (opcode->name, "rzu.ob") == 0) { set_insn_error_i (arg->argnum, _("operand %d must be an immediate"), arg->argnum); return FALSE; } if (!match_regno (arg, OP_REG_VEC, arg->token->u.regno, &regno)) return FALSE; ++arg->token; /* Check whether this is a vector register or a broadcast of a single element. */ if (arg->token->type == OT_INTEGER_INDEX) { if (arg->token->u.index > (is_qh ? 3 : 7)) { set_insn_error (arg->argnum, _("invalid element selector")); return FALSE; } uval |= arg->token->u.index << (is_qh ? 2 : 1) << 5; ++arg->token; } else { /* A full vector. */ if ((opcode->membership & INSN_5400) && (strcmp (opcode->name, "sll.ob") == 0 || strcmp (opcode->name, "srl.ob") == 0)) { set_insn_error_i (arg->argnum, _("operand %d must be scalar"), arg->argnum); return FALSE; } if (is_qh) uval |= MDMX_FMTSEL_VEC_QH << 5; else uval |= MDMX_FMTSEL_VEC_OB << 5; } uval |= regno; } else { offsetT sval; if (!match_const_int (arg, &sval)) return FALSE; if (sval < 0 || sval > 31) { match_out_of_range (arg); return FALSE; } uval |= (sval & 31); if (is_qh) uval |= MDMX_FMTSEL_IMM_QH << 5; else uval |= MDMX_FMTSEL_IMM_OB << 5; } insn_insert_operand (arg->insn, operand, uval); return TRUE; } /* OP_IMM_INDEX matcher. */ static bfd_boolean match_imm_index_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { unsigned int max_val; if (arg->token->type != OT_INTEGER_INDEX) return FALSE; max_val = (1 << operand->size) - 1; if (arg->token->u.index > max_val) { match_out_of_range (arg); return FALSE; } insn_insert_operand (arg->insn, operand, arg->token->u.index); ++arg->token; return TRUE; } /* OP_REG_INDEX matcher. */ static bfd_boolean match_reg_index_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { unsigned int regno; if (arg->token->type != OT_REG_INDEX) return FALSE; if (!match_regno (arg, OP_REG_GP, arg->token->u.regno, &regno)) return FALSE; insn_insert_operand (arg->insn, operand, regno); ++arg->token; return TRUE; } /* OP_PC matcher. */ static bfd_boolean match_pc_operand (struct mips_arg_info *arg) { if (arg->token->type == OT_REG && (arg->token->u.regno & RTYPE_PC)) { ++arg->token; return TRUE; } return FALSE; } /* OP_NON_ZERO_REG matcher. */ static bfd_boolean match_non_zero_reg_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { unsigned int regno; if (!match_reg (arg, OP_REG_GP, &regno)) return FALSE; if (regno == 0) return FALSE; arg->last_regno = regno; insn_insert_operand (arg->insn, operand, regno); return TRUE; } /* OP_REPEAT_DEST_REG and OP_REPEAT_PREV_REG matcher. OTHER_REGNO is the register that we need to match. */ static bfd_boolean match_tied_reg_operand (struct mips_arg_info *arg, unsigned int other_regno) { unsigned int regno; return match_reg (arg, OP_REG_GP, &regno) && regno == other_regno; } /* Read a floating-point constant from S for LI.S or LI.D. LENGTH is the length of the value in bytes (4 for float, 8 for double) and USING_GPRS says whether the destination is a GPR rather than an FPR. Return the constant in IMM and OFFSET as follows: - If the constant should be loaded via memory, set IMM to O_absent and OFFSET to the memory address. - Otherwise, if the constant should be loaded into two 32-bit registers, set IMM to the O_constant to load into the high register and OFFSET to the corresponding value for the low register. - Otherwise, set IMM to the full O_constant and set OFFSET to O_absent. These constants only appear as the last operand in an instruction, and every instruction that accepts them in any variant accepts them in all variants. This means we don't have to worry about backing out any changes if the instruction does not match. We just match unconditionally and report an error if the constant is invalid. */ static bfd_boolean match_float_constant (struct mips_arg_info *arg, expressionS *imm, expressionS *offset, int length, bfd_boolean using_gprs) { char *p; segT seg, new_seg; subsegT subseg; const char *newname; unsigned char *data; /* Where the constant is placed is based on how the MIPS assembler does things: length == 4 && using_gprs -- immediate value only length == 8 && using_gprs -- .rdata or immediate value length == 4 && !using_gprs -- .lit4 or immediate value length == 8 && !using_gprs -- .lit8 or immediate value The .lit4 and .lit8 sections are only used if permitted by the -G argument. */ if (arg->token->type != OT_FLOAT) { set_insn_error (arg->argnum, _("floating-point expression required")); return FALSE; } gas_assert (arg->token->u.flt.length == length); data = arg->token->u.flt.data; ++arg->token; /* Handle 32-bit constants for which an immediate value is best. */ if (length == 4 && (using_gprs || g_switch_value < 4 || (data[0] == 0 && data[1] == 0) || (data[2] == 0 && data[3] == 0))) { imm->X_op = O_constant; if (!target_big_endian) imm->X_add_number = bfd_getl32 (data); else imm->X_add_number = bfd_getb32 (data); offset->X_op = O_absent; return TRUE; } /* Handle 64-bit constants for which an immediate value is best. */ if (length == 8 && !mips_disable_float_construction /* Constants can only be constructed in GPRs and copied to FPRs if the GPRs are at least as wide as the FPRs or MTHC1 is available. Unlike most tests for 32-bit floating-point registers this check specifically looks for GPR_SIZE == 32 as the FPXX ABI does not permit 64-bit moves without MXHC1. Force the constant into memory otherwise. */ && (using_gprs || GPR_SIZE == 64 || ISA_HAS_MXHC1 (mips_opts.isa) || FPR_SIZE == 32) && ((data[0] == 0 && data[1] == 0) || (data[2] == 0 && data[3] == 0)) && ((data[4] == 0 && data[5] == 0) || (data[6] == 0 && data[7] == 0))) { /* The value is simple enough to load with a couple of instructions. If using 32-bit registers, set IMM to the high order 32 bits and OFFSET to the low order 32 bits. Otherwise, set IMM to the entire 64 bit constant. */ if (GPR_SIZE == 32 || (!using_gprs && FPR_SIZE != 64)) { imm->X_op = O_constant; offset->X_op = O_constant; if (!target_big_endian) { imm->X_add_number = bfd_getl32 (data + 4); offset->X_add_number = bfd_getl32 (data); } else { imm->X_add_number = bfd_getb32 (data); offset->X_add_number = bfd_getb32 (data + 4); } if (offset->X_add_number == 0) offset->X_op = O_absent; } else { imm->X_op = O_constant; if (!target_big_endian) imm->X_add_number = bfd_getl64 (data); else imm->X_add_number = bfd_getb64 (data); offset->X_op = O_absent; } return TRUE; } /* Switch to the right section. */ seg = now_seg; subseg = now_subseg; if (length == 4) { gas_assert (!using_gprs && g_switch_value >= 4); newname = ".lit4"; } else { if (using_gprs || g_switch_value < 8) newname = RDATA_SECTION_NAME; else newname = ".lit8"; } new_seg = subseg_new (newname, (subsegT) 0); bfd_set_section_flags (stdoutput, new_seg, SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA); frag_align (length == 4 ? 2 : 3, 0, 0); if (strncmp (TARGET_OS, "elf", 3) != 0) record_alignment (new_seg, 4); else record_alignment (new_seg, length == 4 ? 2 : 3); if (seg == now_seg) as_bad (_("cannot use `%s' in this section"), arg->insn->insn_mo->name); /* Set the argument to the current address in the section. */ imm->X_op = O_absent; offset->X_op = O_symbol; offset->X_add_symbol = symbol_temp_new_now (); offset->X_add_number = 0; /* Put the floating point number into the section. */ p = frag_more (length); memcpy (p, data, length); /* Switch back to the original section. */ subseg_set (seg, subseg); return TRUE; } /* OP_VU0_SUFFIX and OP_VU0_MATCH_SUFFIX matcher; MATCH_P selects between them. */ static bfd_boolean match_vu0_suffix_operand (struct mips_arg_info *arg, const struct mips_operand *operand, bfd_boolean match_p) { unsigned int uval; /* The operand can be an XYZW mask or a single 2-bit channel index (with X being 0). */ gas_assert (operand->size == 2 || operand->size == 4); /* The suffix can be omitted when it is already part of the opcode. */ if (arg->token->type != OT_CHANNELS) return match_p; uval = arg->token->u.channels; if (operand->size == 2) { /* Check that a single bit is set and convert it into a 2-bit index. */ if ((uval & -uval) != uval) return FALSE; uval = 4 - ffs (uval); } if (match_p && insn_extract_operand (arg->insn, operand) != uval) return FALSE; ++arg->token; if (!match_p) insn_insert_operand (arg->insn, operand, uval); return TRUE; } /* S is the text seen for ARG. Match it against OPERAND. Return the end of the argument text if the match is successful, otherwise return null. */ static bfd_boolean match_operand (struct mips_arg_info *arg, const struct mips_operand *operand) { switch (operand->type) { case OP_INT: return match_int_operand (arg, operand); case OP_MAPPED_INT: return match_mapped_int_operand (arg, operand); case OP_MSB: return match_msb_operand (arg, operand); case OP_REG: case OP_OPTIONAL_REG: return match_reg_operand (arg, operand); case OP_REG_PAIR: return match_reg_pair_operand (arg, operand); case OP_PCREL: return match_pcrel_operand (arg); case OP_PERF_REG: return match_perf_reg_operand (arg, operand); case OP_ADDIUSP_INT: return match_addiusp_operand (arg, operand); case OP_CLO_CLZ_DEST: return match_clo_clz_dest_operand (arg, operand); case OP_LWM_SWM_LIST: return match_lwm_swm_list_operand (arg, operand); case OP_ENTRY_EXIT_LIST: return match_entry_exit_operand (arg, operand); case OP_SAVE_RESTORE_LIST: return match_save_restore_list_operand (arg); case OP_MDMX_IMM_REG: return match_mdmx_imm_reg_operand (arg, operand); case OP_REPEAT_DEST_REG: return match_tied_reg_operand (arg, arg->dest_regno); case OP_REPEAT_PREV_REG: return match_tied_reg_operand (arg, arg->last_regno); case OP_PC: return match_pc_operand (arg); case OP_VU0_SUFFIX: return match_vu0_suffix_operand (arg, operand, FALSE); case OP_VU0_MATCH_SUFFIX: return match_vu0_suffix_operand (arg, operand, TRUE); case OP_IMM_INDEX: return match_imm_index_operand (arg, operand); case OP_REG_INDEX: return match_reg_index_operand (arg, operand); case OP_SAME_RS_RT: return match_same_rs_rt_operand (arg, operand); case OP_CHECK_PREV: return match_check_prev_operand (arg, operand); case OP_NON_ZERO_REG: return match_non_zero_reg_operand (arg, operand); } abort (); } /* ARG is the state after successfully matching an instruction. Issue any queued-up warnings. */ static void check_completed_insn (struct mips_arg_info *arg) { if (arg->seen_at) { if (AT == ATREG) as_warn (_("used $at without \".set noat\"")); else as_warn (_("used $%u with \".set at=$%u\""), AT, AT); } } /* Return true if modifying general-purpose register REG needs a delay. */ static bfd_boolean reg_needs_delay (unsigned int reg) { unsigned long prev_pinfo; prev_pinfo = history[0].insn_mo->pinfo; if (!mips_opts.noreorder && (((prev_pinfo & INSN_LOAD_MEMORY) && !gpr_interlocks) || ((prev_pinfo & INSN_LOAD_COPROC) && !cop_interlocks)) && (gpr_write_mask (&history[0]) & (1 << reg))) return TRUE; return FALSE; } /* Classify an instruction according to the FIX_VR4120_* enumeration. Return NUM_FIX_VR4120_CLASSES if the instruction isn't affected by VR4120 errata. */ static unsigned int classify_vr4120_insn (const char *name) { if (strncmp (name, "macc", 4) == 0) return FIX_VR4120_MACC; if (strncmp (name, "dmacc", 5) == 0) return FIX_VR4120_DMACC; if (strncmp (name, "mult", 4) == 0) return FIX_VR4120_MULT; if (strncmp (name, "dmult", 5) == 0) return FIX_VR4120_DMULT; if (strstr (name, "div")) return FIX_VR4120_DIV; if (strcmp (name, "mtlo") == 0 || strcmp (name, "mthi") == 0) return FIX_VR4120_MTHILO; return NUM_FIX_VR4120_CLASSES; } #define INSN_ERET 0x42000018 #define INSN_DERET 0x4200001f #define INSN_DMULT 0x1c #define INSN_DMULTU 0x1d /* Return the number of instructions that must separate INSN1 and INSN2, where INSN1 is the earlier instruction. Return the worst-case value for any INSN2 if INSN2 is null. */ static unsigned int insns_between (const struct mips_cl_insn *insn1, const struct mips_cl_insn *insn2) { unsigned long pinfo1, pinfo2; unsigned int mask; /* If INFO2 is null, pessimistically assume that all flags are set for the second instruction. */ pinfo1 = insn1->insn_mo->pinfo; pinfo2 = insn2 ? insn2->insn_mo->pinfo : ~0U; /* For most targets, write-after-read dependencies on the HI and LO registers must be separated by at least two instructions. */ if (!hilo_interlocks) { if ((pinfo1 & INSN_READ_LO) && (pinfo2 & INSN_WRITE_LO)) return 2; if ((pinfo1 & INSN_READ_HI) && (pinfo2 & INSN_WRITE_HI)) return 2; } /* If we're working around r7000 errata, there must be two instructions between an mfhi or mflo and any instruction that uses the result. */ if (mips_7000_hilo_fix && !mips_opts.micromips && MF_HILO_INSN (pinfo1) && (insn2 == NULL || (gpr_read_mask (insn2) & gpr_write_mask (insn1)))) return 2; /* If we're working around 24K errata, one instruction is required if an ERET or DERET is followed by a branch instruction. */ if (mips_fix_24k && !mips_opts.micromips) { if (insn1->insn_opcode == INSN_ERET || insn1->insn_opcode == INSN_DERET) { if (insn2 == NULL || insn2->insn_opcode == INSN_ERET || insn2->insn_opcode == INSN_DERET || delayed_branch_p (insn2)) return 1; } } /* If we're working around PMC RM7000 errata, there must be three nops between a dmult and a load instruction. */ if (mips_fix_rm7000 && !mips_opts.micromips) { if ((insn1->insn_opcode & insn1->insn_mo->mask) == INSN_DMULT || (insn1->insn_opcode & insn1->insn_mo->mask) == INSN_DMULTU) { if (pinfo2 & INSN_LOAD_MEMORY) return 3; } } /* If working around VR4120 errata, check for combinations that need a single intervening instruction. */ if (mips_fix_vr4120 && !mips_opts.micromips) { unsigned int class1, class2; class1 = classify_vr4120_insn (insn1->insn_mo->name); if (class1 != NUM_FIX_VR4120_CLASSES && vr4120_conflicts[class1] != 0) { if (insn2 == NULL) return 1; class2 = classify_vr4120_insn (insn2->insn_mo->name); if (vr4120_conflicts[class1] & (1 << class2)) return 1; } } if (!HAVE_CODE_COMPRESSION) { /* Check for GPR or coprocessor load delays. All such delays are on the RT register. */ /* Itbl support may require additional care here. */ if ((!gpr_interlocks && (pinfo1 & INSN_LOAD_MEMORY)) || (!cop_interlocks && (pinfo1 & INSN_LOAD_COPROC))) { if (insn2 == NULL || (gpr_read_mask (insn2) & gpr_write_mask (insn1))) return 1; } /* Check for generic coprocessor hazards. This case is not handled very well. There is no special knowledge of CP0 handling, and the coprocessors other than the floating point unit are not distinguished at all. */ /* Itbl support may require additional care here. FIXME! Need to modify this to include knowledge about user specified delays! */ else if ((!cop_interlocks && (pinfo1 & INSN_COPROC_MOVE)) || (!cop_mem_interlocks && (pinfo1 & INSN_COPROC_MEMORY_DELAY))) { /* Handle cases where INSN1 writes to a known general coprocessor register. There must be a one instruction delay before INSN2 if INSN2 reads that register, otherwise no delay is needed. */ mask = fpr_write_mask (insn1); if (mask != 0) { if (!insn2 || (mask & fpr_read_mask (insn2)) != 0) return 1; } else { /* Read-after-write dependencies on the control registers require a two-instruction gap. */ if ((pinfo1 & INSN_WRITE_COND_CODE) && (pinfo2 & INSN_READ_COND_CODE)) return 2; /* We don't know exactly what INSN1 does. If INSN2 is also a coprocessor instruction, assume there must be a one instruction gap. */ if (pinfo2 & INSN_COP) return 1; } } /* Check for read-after-write dependencies on the coprocessor control registers in cases where INSN1 does not need a general coprocessor delay. This means that INSN1 is a floating point comparison instruction. */ /* Itbl support may require additional care here. */ else if (!cop_interlocks && (pinfo1 & INSN_WRITE_COND_CODE) && (pinfo2 & INSN_READ_COND_CODE)) return 1; } /* Forbidden slots can not contain Control Transfer Instructions (CTIs) CTIs include all branches and jumps, nal, eret, eretnc, deret, wait and pause. */ if ((insn1->insn_mo->pinfo2 & INSN2_FORBIDDEN_SLOT) && ((pinfo2 & INSN_NO_DELAY_SLOT) || (insn2 && delayed_branch_p (insn2)))) return 1; return 0; } /* Return the number of nops that would be needed to work around the VR4130 mflo/mfhi errata if instruction INSN immediately followed the MAX_VR4130_NOPS instructions described by HIST. Ignore hazards that are contained within the first IGNORE instructions of HIST. */ static int nops_for_vr4130 (int ignore, const struct mips_cl_insn *hist, const struct mips_cl_insn *insn) { int i, j; unsigned int mask; /* Check if the instruction writes to HI or LO. MTHI and MTLO are not affected by the errata. */ if (insn != 0 && ((insn->insn_mo->pinfo & (INSN_WRITE_HI | INSN_WRITE_LO)) == 0 || strcmp (insn->insn_mo->name, "mtlo") == 0 || strcmp (insn->insn_mo->name, "mthi") == 0)) return 0; /* Search for the first MFLO or MFHI. */ for (i = 0; i < MAX_VR4130_NOPS; i++) if (MF_HILO_INSN (hist[i].insn_mo->pinfo)) { /* Extract the destination register. */ mask = gpr_write_mask (&hist[i]); /* No nops are needed if INSN reads that register. */ if (insn != NULL && (gpr_read_mask (insn) & mask) != 0) return 0; /* ...or if any of the intervening instructions do. */ for (j = 0; j < i; j++) if (gpr_read_mask (&hist[j]) & mask) return 0; if (i >= ignore) return MAX_VR4130_NOPS - i; } return 0; } #define BASE_REG_EQ(INSN1, INSN2) \ ((((INSN1) >> OP_SH_RS) & OP_MASK_RS) \ == (((INSN2) >> OP_SH_RS) & OP_MASK_RS)) /* Return the minimum alignment for this store instruction. */ static int fix_24k_align_to (const struct mips_opcode *mo) { if (strcmp (mo->name, "sh") == 0) return 2; if (strcmp (mo->name, "swc1") == 0 || strcmp (mo->name, "swc2") == 0 || strcmp (mo->name, "sw") == 0 || strcmp (mo->name, "sc") == 0 || strcmp (mo->name, "s.s") == 0) return 4; if (strcmp (mo->name, "sdc1") == 0 || strcmp (mo->name, "sdc2") == 0 || strcmp (mo->name, "s.d") == 0) return 8; /* sb, swl, swr */ return 1; } struct fix_24k_store_info { /* Immediate offset, if any, for this store instruction. */ short off; /* Alignment required by this store instruction. */ int align_to; /* True for register offsets. */ int register_offset; }; /* Comparison function used by qsort. */ static int fix_24k_sort (const void *a, const void *b) { const struct fix_24k_store_info *pos1 = a; const struct fix_24k_store_info *pos2 = b; return (pos1->off - pos2->off); } /* INSN is a store instruction. Try to record the store information in STINFO. Return false if the information isn't known. */ static bfd_boolean fix_24k_record_store_info (struct fix_24k_store_info *stinfo, const struct mips_cl_insn *insn) { /* The instruction must have a known offset. */ if (!insn->complete_p || !strstr (insn->insn_mo->args, "o(")) return FALSE; stinfo->off = (insn->insn_opcode >> OP_SH_IMMEDIATE) & OP_MASK_IMMEDIATE; stinfo->align_to = fix_24k_align_to (insn->insn_mo); return TRUE; } /* Return the number of nops that would be needed to work around the 24k "lost data on stores during refill" errata if instruction INSN immediately followed the 2 instructions described by HIST. Ignore hazards that are contained within the first IGNORE instructions of HIST. Problem: The FSB (fetch store buffer) acts as an intermediate buffer for the data cache refills and store data. The following describes the scenario where the store data could be lost. * A data cache miss, due to either a load or a store, causing fill data to be supplied by the memory subsystem * The first three doublewords of fill data are returned and written into the cache * A sequence of four stores occurs in consecutive cycles around the final doubleword of the fill: * Store A * Store B * Store C * Zero, One or more instructions * Store D The four stores A-D must be to different doublewords of the line that is being filled. The fourth instruction in the sequence above permits the fill of the final doubleword to be transferred from the FSB into the cache. In the sequence above, the stores may be either integer (sb, sh, sw, swr, swl, sc) or coprocessor (swc1/swc2, sdc1/sdc2, swxc1, sdxc1, suxc1) stores, as long as the four stores are to different doublewords on the line. If the floating point unit is running in 1:2 mode, it is not possible to create the sequence above using only floating point store instructions. In this case, the cache line being filled is incorrectly marked invalid, thereby losing the data from any store to the line that occurs between the original miss and the completion of the five cycle sequence shown above. The workarounds are: * Run the data cache in write-through mode. * Insert a non-store instruction between Store A and Store B or Store B and Store C. */ static int nops_for_24k (int ignore, const struct mips_cl_insn *hist, const struct mips_cl_insn *insn) { struct fix_24k_store_info pos[3]; int align, i, base_offset; if (ignore >= 2) return 0; /* If the previous instruction wasn't a store, there's nothing to worry about. */ if ((hist[0].insn_mo->pinfo & INSN_STORE_MEMORY) == 0) return 0; /* If the instructions after the previous one are unknown, we have to assume the worst. */ if (!insn) return 1; /* Check whether we are dealing with three consecutive stores. */ if ((insn->insn_mo->pinfo & INSN_STORE_MEMORY) == 0 || (hist[1].insn_mo->pinfo & INSN_STORE_MEMORY) == 0) return 0; /* If we don't know the relationship between the store addresses, assume the worst. */ if (!BASE_REG_EQ (insn->insn_opcode, hist[0].insn_opcode) || !BASE_REG_EQ (insn->insn_opcode, hist[1].insn_opcode)) return 1; if (!fix_24k_record_store_info (&pos[0], insn) || !fix_24k_record_store_info (&pos[1], &hist[0]) || !fix_24k_record_store_info (&pos[2], &hist[1])) return 1; qsort (&pos, 3, sizeof (struct fix_24k_store_info), fix_24k_sort); /* Pick a value of ALIGN and X such that all offsets are adjusted by X bytes and such that the base register + X is known to be aligned to align bytes. */ if (((insn->insn_opcode >> OP_SH_RS) & OP_MASK_RS) == SP) align = 8; else { align = pos[0].align_to; base_offset = pos[0].off; for (i = 1; i < 3; i++) if (align < pos[i].align_to) { align = pos[i].align_to; base_offset = pos[i].off; } for (i = 0; i < 3; i++) pos[i].off -= base_offset; } pos[0].off &= ~align + 1; pos[1].off &= ~align + 1; pos[2].off &= ~align + 1; /* If any two stores write to the same chunk, they also write to the same doubleword. The offsets are still sorted at this point. */ if (pos[0].off == pos[1].off || pos[1].off == pos[2].off) return 0; /* A range of at least 9 bytes is needed for the stores to be in non-overlapping doublewords. */ if (pos[2].off - pos[0].off <= 8) return 0; if (pos[2].off - pos[1].off >= 24 || pos[1].off - pos[0].off >= 24 || pos[2].off - pos[0].off >= 32) return 0; return 1; } /* Return the number of nops that would be needed if instruction INSN immediately followed the MAX_NOPS instructions given by HIST, where HIST[0] is the most recent instruction. Ignore hazards between INSN and the first IGNORE instructions in HIST. If INSN is null, return the worse-case number of nops for any instruction. */ static int nops_for_insn (int ignore, const struct mips_cl_insn *hist, const struct mips_cl_insn *insn) { int i, nops, tmp_nops; nops = 0; for (i = ignore; i < MAX_DELAY_NOPS; i++) { tmp_nops = insns_between (hist + i, insn) - i; if (tmp_nops > nops) nops = tmp_nops; } if (mips_fix_vr4130 && !mips_opts.micromips) { tmp_nops = nops_for_vr4130 (ignore, hist, insn); if (tmp_nops > nops) nops = tmp_nops; } if (mips_fix_24k && !mips_opts.micromips) { tmp_nops = nops_for_24k (ignore, hist, insn); if (tmp_nops > nops) nops = tmp_nops; } return nops; } /* The variable arguments provide NUM_INSNS extra instructions that might be added to HIST. Return the largest number of nops that would be needed after the extended sequence, ignoring hazards in the first IGNORE instructions. */ static int nops_for_sequence (int num_insns, int ignore, const struct mips_cl_insn *hist, ...) { va_list args; struct mips_cl_insn buffer[MAX_NOPS]; struct mips_cl_insn *cursor; int nops; va_start (args, hist); cursor = buffer + num_insns; memcpy (cursor, hist, (MAX_NOPS - num_insns) * sizeof (*cursor)); while (cursor > buffer) *--cursor = *va_arg (args, const struct mips_cl_insn *); nops = nops_for_insn (ignore, buffer, NULL); va_end (args); return nops; } /* Like nops_for_insn, but if INSN is a branch, take into account the worst-case delay for the branch target. */ static int nops_for_insn_or_target (int ignore, const struct mips_cl_insn *hist, const struct mips_cl_insn *insn) { int nops, tmp_nops; nops = nops_for_insn (ignore, hist, insn); if (delayed_branch_p (insn)) { tmp_nops = nops_for_sequence (2, ignore ? ignore + 2 : 0, hist, insn, get_delay_slot_nop (insn)); if (tmp_nops > nops) nops = tmp_nops; } else if (compact_branch_p (insn)) { tmp_nops = nops_for_sequence (1, ignore ? ignore + 1 : 0, hist, insn); if (tmp_nops > nops) nops = tmp_nops; } return nops; } /* Fix NOP issue: Replace nops by "or at,at,zero". */ static void fix_loongson2f_nop (struct mips_cl_insn * ip) { gas_assert (!HAVE_CODE_COMPRESSION); if (strcmp (ip->insn_mo->name, "nop") == 0) ip->insn_opcode = LOONGSON2F_NOP_INSN; } /* Fix Jump Issue: Eliminate instruction fetch from outside 256M region jr target pc &= 'hffff_ffff_cfff_ffff. */ static void fix_loongson2f_jump (struct mips_cl_insn * ip) { gas_assert (!HAVE_CODE_COMPRESSION); if (strcmp (ip->insn_mo->name, "j") == 0 || strcmp (ip->insn_mo->name, "jr") == 0 || strcmp (ip->insn_mo->name, "jalr") == 0) { int sreg; expressionS ep; if (! mips_opts.at) return; sreg = EXTRACT_OPERAND (0, RS, *ip); if (sreg == ZERO || sreg == KT0 || sreg == KT1 || sreg == ATREG) return; ep.X_op = O_constant; ep.X_add_number = 0xcfff0000; macro_build (&ep, "lui", "t,u", ATREG, BFD_RELOC_HI16); ep.X_add_number = 0xffff; macro_build (&ep, "ori", "t,r,i", ATREG, ATREG, BFD_RELOC_LO16); macro_build (NULL, "and", "d,v,t", sreg, sreg, ATREG); } } static void fix_loongson2f (struct mips_cl_insn * ip) { if (mips_fix_loongson2f_nop) fix_loongson2f_nop (ip); if (mips_fix_loongson2f_jump) fix_loongson2f_jump (ip); } /* IP is a branch that has a delay slot, and we need to fill it automatically. Return true if we can do that by swapping IP with the previous instruction. ADDRESS_EXPR is an operand of the instruction to be used with RELOC_TYPE. */ static bfd_boolean can_swap_branch_p (struct mips_cl_insn *ip, expressionS *address_expr, bfd_reloc_code_real_type *reloc_type) { unsigned long pinfo, pinfo2, prev_pinfo, prev_pinfo2; unsigned int gpr_read, gpr_write, prev_gpr_read, prev_gpr_write; unsigned int fpr_read, prev_fpr_write; /* -O2 and above is required for this optimization. */ if (mips_optimize < 2) return FALSE; /* If we have seen .set volatile or .set nomove, don't optimize. */ if (mips_opts.nomove) return FALSE; /* We can't swap if the previous instruction's position is fixed. */ if (history[0].fixed_p) return FALSE; /* If the previous previous insn was in a .set noreorder, we can't swap. Actually, the MIPS assembler will swap in this situation. However, gcc configured -with-gnu-as will generate code like .set noreorder lw $4,XXX .set reorder INSN bne $4,$0,foo in which we can not swap the bne and INSN. If gcc is not configured -with-gnu-as, it does not output the .set pseudo-ops. */ if (history[1].noreorder_p) return FALSE; /* If the previous instruction had a fixup in mips16 mode, we can not swap. This means that the previous instruction was a 4-byte one anyhow. */ if (mips_opts.mips16 && history[0].fixp[0]) return FALSE; /* If the branch is itself the target of a branch, we can not swap. We cheat on this; all we check for is whether there is a label on this instruction. If there are any branches to anything other than a label, users must use .set noreorder. */ if (seg_info (now_seg)->label_list) return FALSE; /* If the previous instruction is in a variant frag other than this branch's one, we cannot do the swap. This does not apply to MIPS16 code, which uses variant frags for different purposes. */ if (!mips_opts.mips16 && history[0].frag && history[0].frag->fr_type == rs_machine_dependent) return FALSE; /* We do not swap with instructions that cannot architecturally be placed in a branch delay slot, such as SYNC or ERET. We also refrain from swapping with a trap instruction, since it complicates trap handlers to have the trap instruction be in a delay slot. */ prev_pinfo = history[0].insn_mo->pinfo; if (prev_pinfo & INSN_NO_DELAY_SLOT) return FALSE; /* Check for conflicts between the branch and the instructions before the candidate delay slot. */ if (nops_for_insn (0, history + 1, ip) > 0) return FALSE; /* Check for conflicts between the swapped sequence and the target of the branch. */ if (nops_for_sequence (2, 0, history + 1, ip, history) > 0) return FALSE; /* If the branch reads a register that the previous instruction sets, we can not swap. */ gpr_read = gpr_read_mask (ip); prev_gpr_write = gpr_write_mask (&history[0]); if (gpr_read & prev_gpr_write) return FALSE; fpr_read = fpr_read_mask (ip); prev_fpr_write = fpr_write_mask (&history[0]); if (fpr_read & prev_fpr_write) return FALSE; /* If the branch writes a register that the previous instruction sets, we can not swap. */ gpr_write = gpr_write_mask (ip); if (gpr_write & prev_gpr_write) return FALSE; /* If the branch writes a register that the previous instruction reads, we can not swap. */ prev_gpr_read = gpr_read_mask (&history[0]); if (gpr_write & prev_gpr_read) return FALSE; /* If one instruction sets a condition code and the other one uses a condition code, we can not swap. */ pinfo = ip->insn_mo->pinfo; if ((pinfo & INSN_READ_COND_CODE) && (prev_pinfo & INSN_WRITE_COND_CODE)) return FALSE; if ((pinfo & INSN_WRITE_COND_CODE) && (prev_pinfo & INSN_READ_COND_CODE)) return FALSE; /* If the previous instruction uses the PC, we can not swap. */ prev_pinfo2 = history[0].insn_mo->pinfo2; if (prev_pinfo2 & INSN2_READ_PC) return FALSE; /* If the previous instruction has an incorrect size for a fixed branch delay slot in microMIPS mode, we cannot swap. */ pinfo2 = ip->insn_mo->pinfo2; if (mips_opts.micromips && (pinfo2 & INSN2_BRANCH_DELAY_16BIT) && insn_length (history) != 2) return FALSE; if (mips_opts.micromips && (pinfo2 & INSN2_BRANCH_DELAY_32BIT) && insn_length (history) != 4) return FALSE; /* On R5900 short loops need to be fixed by inserting a nop in the branch delay slots. A short loop can be terminated too early. */ if (mips_opts.arch == CPU_R5900 /* Check if instruction has a parameter, ignore "j $31". */ && (address_expr != NULL) /* Parameter must be 16 bit. */ && (*reloc_type == BFD_RELOC_16_PCREL_S2) /* Branch to same segment. */ && (S_GET_SEGMENT (address_expr->X_add_symbol) == now_seg) /* Branch to same code fragment. */ && (symbol_get_frag (address_expr->X_add_symbol) == frag_now) /* Can only calculate branch offset if value is known. */ && symbol_constant_p (address_expr->X_add_symbol) /* Check if branch is really conditional. */ && !((ip->insn_opcode & 0xffff0000) == 0x10000000 /* beq $0,$0 */ || (ip->insn_opcode & 0xffff0000) == 0x04010000 /* bgez $0 */ || (ip->insn_opcode & 0xffff0000) == 0x04110000)) /* bgezal $0 */ { int distance; /* Check if loop is shorter than 6 instructions including branch and delay slot. */ distance = frag_now_fix () - S_GET_VALUE (address_expr->X_add_symbol); if (distance <= 20) { int i; int rv; rv = FALSE; /* When the loop includes branches or jumps, it is not a short loop. */ for (i = 0; i < (distance / 4); i++) { if ((history[i].cleared_p) || delayed_branch_p (&history[i])) { rv = TRUE; break; } } if (rv == FALSE) { /* Insert nop after branch to fix short loop. */ return FALSE; } } } return TRUE; } /* Decide how we should add IP to the instruction stream. ADDRESS_EXPR is an operand of the instruction to be used with RELOC_TYPE. */ static enum append_method get_append_method (struct mips_cl_insn *ip, expressionS *address_expr, bfd_reloc_code_real_type *reloc_type) { /* The relaxed version of a macro sequence must be inherently hazard-free. */ if (mips_relax.sequence == 2) return APPEND_ADD; /* We must not dabble with instructions in a ".set noreorder" block. */ if (mips_opts.noreorder) return APPEND_ADD; /* Otherwise, it's our responsibility to fill branch delay slots. */ if (delayed_branch_p (ip)) { if (!branch_likely_p (ip) && can_swap_branch_p (ip, address_expr, reloc_type)) return APPEND_SWAP; if (mips_opts.mips16 && ISA_SUPPORTS_MIPS16E && gpr_read_mask (ip) != 0) return APPEND_ADD_COMPACT; if (mips_opts.micromips && ((ip->insn_opcode & 0xffe0) == 0x4580 || (!forced_insn_length && ((ip->insn_opcode & 0xfc00) == 0xcc00 || (ip->insn_opcode & 0xdc00) == 0x8c00)) || (ip->insn_opcode & 0xdfe00000) == 0x94000000 || (ip->insn_opcode & 0xdc1f0000) == 0x94000000)) return APPEND_ADD_COMPACT; return APPEND_ADD_WITH_NOP; } return APPEND_ADD; } /* IP is an instruction whose opcode we have just changed, END points to the end of the opcode table processed. Point IP->insn_mo to the new opcode's definition. */ static void find_altered_opcode (struct mips_cl_insn *ip, const struct mips_opcode *end) { const struct mips_opcode *mo; for (mo = ip->insn_mo; mo < end; mo++) if (mo->pinfo != INSN_MACRO && (ip->insn_opcode & mo->mask) == mo->match) { ip->insn_mo = mo; return; } abort (); } /* IP is a MIPS16 instruction whose opcode we have just changed. Point IP->insn_mo to the new opcode's definition. */ static void find_altered_mips16_opcode (struct mips_cl_insn *ip) { find_altered_opcode (ip, &mips16_opcodes[bfd_mips16_num_opcodes]); } /* IP is a microMIPS instruction whose opcode we have just changed. Point IP->insn_mo to the new opcode's definition. */ static void find_altered_micromips_opcode (struct mips_cl_insn *ip) { find_altered_opcode (ip, &micromips_opcodes[bfd_micromips_num_opcodes]); } /* For microMIPS macros, we need to generate a local number label as the target of branches. */ #define MICROMIPS_LABEL_CHAR '\037' static unsigned long micromips_target_label; static char micromips_target_name[32]; static char * micromips_label_name (void) { char *p = micromips_target_name; char symbol_name_temporary[24]; unsigned long l; int i; if (*p) return p; i = 0; l = micromips_target_label; #ifdef LOCAL_LABEL_PREFIX *p++ = LOCAL_LABEL_PREFIX; #endif *p++ = 'L'; *p++ = MICROMIPS_LABEL_CHAR; do { symbol_name_temporary[i++] = l % 10 + '0'; l /= 10; } while (l != 0); while (i > 0) *p++ = symbol_name_temporary[--i]; *p = '\0'; return micromips_target_name; } static void micromips_label_expr (expressionS *label_expr) { label_expr->X_op = O_symbol; label_expr->X_add_symbol = symbol_find_or_make (micromips_label_name ()); label_expr->X_add_number = 0; } static void micromips_label_inc (void) { micromips_target_label++; *micromips_target_name = '\0'; } static void micromips_add_label (void) { symbolS *s; s = colon (micromips_label_name ()); micromips_label_inc (); S_SET_OTHER (s, ELF_ST_SET_MICROMIPS (S_GET_OTHER (s))); } /* If assembling microMIPS code, then return the microMIPS reloc corresponding to the requested one if any. Otherwise return the reloc unchanged. */ static bfd_reloc_code_real_type micromips_map_reloc (bfd_reloc_code_real_type reloc) { static const bfd_reloc_code_real_type relocs[][2] = { /* Keep sorted incrementally by the left-hand key. */ { BFD_RELOC_16_PCREL_S2, BFD_RELOC_MICROMIPS_16_PCREL_S1 }, { BFD_RELOC_GPREL16, BFD_RELOC_MICROMIPS_GPREL16 }, { BFD_RELOC_MIPS_JMP, BFD_RELOC_MICROMIPS_JMP }, { BFD_RELOC_HI16, BFD_RELOC_MICROMIPS_HI16 }, { BFD_RELOC_HI16_S, BFD_RELOC_MICROMIPS_HI16_S }, { BFD_RELOC_LO16, BFD_RELOC_MICROMIPS_LO16 }, { BFD_RELOC_MIPS_LITERAL, BFD_RELOC_MICROMIPS_LITERAL }, { BFD_RELOC_MIPS_GOT16, BFD_RELOC_MICROMIPS_GOT16 }, { BFD_RELOC_MIPS_CALL16, BFD_RELOC_MICROMIPS_CALL16 }, { BFD_RELOC_MIPS_GOT_HI16, BFD_RELOC_MICROMIPS_GOT_HI16 }, { BFD_RELOC_MIPS_GOT_LO16, BFD_RELOC_MICROMIPS_GOT_LO16 }, { BFD_RELOC_MIPS_CALL_HI16, BFD_RELOC_MICROMIPS_CALL_HI16 }, { BFD_RELOC_MIPS_CALL_LO16, BFD_RELOC_MICROMIPS_CALL_LO16 }, { BFD_RELOC_MIPS_SUB, BFD_RELOC_MICROMIPS_SUB }, { BFD_RELOC_MIPS_GOT_PAGE, BFD_RELOC_MICROMIPS_GOT_PAGE }, { BFD_RELOC_MIPS_GOT_OFST, BFD_RELOC_MICROMIPS_GOT_OFST }, { BFD_RELOC_MIPS_GOT_DISP, BFD_RELOC_MICROMIPS_GOT_DISP }, { BFD_RELOC_MIPS_HIGHEST, BFD_RELOC_MICROMIPS_HIGHEST }, { BFD_RELOC_MIPS_HIGHER, BFD_RELOC_MICROMIPS_HIGHER }, { BFD_RELOC_MIPS_SCN_DISP, BFD_RELOC_MICROMIPS_SCN_DISP }, { BFD_RELOC_MIPS_TLS_GD, BFD_RELOC_MICROMIPS_TLS_GD }, { BFD_RELOC_MIPS_TLS_LDM, BFD_RELOC_MICROMIPS_TLS_LDM }, { BFD_RELOC_MIPS_TLS_DTPREL_HI16, BFD_RELOC_MICROMIPS_TLS_DTPREL_HI16 }, { BFD_RELOC_MIPS_TLS_DTPREL_LO16, BFD_RELOC_MICROMIPS_TLS_DTPREL_LO16 }, { BFD_RELOC_MIPS_TLS_GOTTPREL, BFD_RELOC_MICROMIPS_TLS_GOTTPREL }, { BFD_RELOC_MIPS_TLS_TPREL_HI16, BFD_RELOC_MICROMIPS_TLS_TPREL_HI16 }, { BFD_RELOC_MIPS_TLS_TPREL_LO16, BFD_RELOC_MICROMIPS_TLS_TPREL_LO16 } }; bfd_reloc_code_real_type r; size_t i; if (!mips_opts.micromips) return reloc; for (i = 0; i < ARRAY_SIZE (relocs); i++) { r = relocs[i][0]; if (r > reloc) return reloc; if (r == reloc) return relocs[i][1]; } return reloc; } /* Try to resolve relocation RELOC against constant OPERAND at assembly time. Return true on success, storing the resolved value in RESULT. */ static bfd_boolean calculate_reloc (bfd_reloc_code_real_type reloc, offsetT operand, offsetT *result) { switch (reloc) { case BFD_RELOC_MIPS_HIGHEST: case BFD_RELOC_MICROMIPS_HIGHEST: *result = ((operand + 0x800080008000ull) >> 48) & 0xffff; return TRUE; case BFD_RELOC_MIPS_HIGHER: case BFD_RELOC_MICROMIPS_HIGHER: *result = ((operand + 0x80008000ull) >> 32) & 0xffff; return TRUE; case BFD_RELOC_HI16_S: case BFD_RELOC_HI16_S_PCREL: case BFD_RELOC_MICROMIPS_HI16_S: case BFD_RELOC_MIPS16_HI16_S: *result = ((operand + 0x8000) >> 16) & 0xffff; return TRUE; case BFD_RELOC_HI16: case BFD_RELOC_MICROMIPS_HI16: case BFD_RELOC_MIPS16_HI16: *result = (operand >> 16) & 0xffff; return TRUE; case BFD_RELOC_LO16: case BFD_RELOC_LO16_PCREL: case BFD_RELOC_MICROMIPS_LO16: case BFD_RELOC_MIPS16_LO16: *result = operand & 0xffff; return TRUE; case BFD_RELOC_UNUSED: *result = operand; return TRUE; default: return FALSE; } } /* Output an instruction. IP is the instruction information. ADDRESS_EXPR is an operand of the instruction to be used with RELOC_TYPE. EXPANSIONP is true if the instruction is part of a macro expansion. */ static void append_insn (struct mips_cl_insn *ip, expressionS *address_expr, bfd_reloc_code_real_type *reloc_type, bfd_boolean expansionp) { unsigned long prev_pinfo2, pinfo; bfd_boolean relaxed_branch = FALSE; enum append_method method; bfd_boolean relax32; int branch_disp; if (mips_fix_loongson2f && !HAVE_CODE_COMPRESSION) fix_loongson2f (ip); file_ase_mips16 |= mips_opts.mips16; file_ase_micromips |= mips_opts.micromips; prev_pinfo2 = history[0].insn_mo->pinfo2; pinfo = ip->insn_mo->pinfo; /* Don't raise alarm about `nods' frags as they'll fill in the right kind of nop in relaxation if required. */ if (mips_opts.micromips && !expansionp && !(history[0].frag && history[0].frag->fr_type == rs_machine_dependent && RELAX_MICROMIPS_P (history[0].frag->fr_subtype) && RELAX_MICROMIPS_NODS (history[0].frag->fr_subtype)) && (((prev_pinfo2 & INSN2_BRANCH_DELAY_16BIT) != 0 && micromips_insn_length (ip->insn_mo) != 2) || ((prev_pinfo2 & INSN2_BRANCH_DELAY_32BIT) != 0 && micromips_insn_length (ip->insn_mo) != 4))) as_warn (_("wrong size instruction in a %u-bit branch delay slot"), (prev_pinfo2 & INSN2_BRANCH_DELAY_16BIT) != 0 ? 16 : 32); if (address_expr == NULL) ip->complete_p = 1; else if (reloc_type[0] <= BFD_RELOC_UNUSED && reloc_type[1] == BFD_RELOC_UNUSED && reloc_type[2] == BFD_RELOC_UNUSED && address_expr->X_op == O_constant) { switch (*reloc_type) { case BFD_RELOC_MIPS_JMP: { int shift; /* Shift is 2, unusually, for microMIPS JALX. */ shift = (mips_opts.micromips && strcmp (ip->insn_mo->name, "jalx") != 0) ? 1 : 2; if ((address_expr->X_add_number & ((1 << shift) - 1)) != 0) as_bad (_("jump to misaligned address (0x%lx)"), (unsigned long) address_expr->X_add_number); ip->insn_opcode |= ((address_expr->X_add_number >> shift) & 0x3ffffff); ip->complete_p = 1; } break; case BFD_RELOC_MIPS16_JMP: if ((address_expr->X_add_number & 3) != 0) as_bad (_("jump to misaligned address (0x%lx)"), (unsigned long) address_expr->X_add_number); ip->insn_opcode |= (((address_expr->X_add_number & 0x7c0000) << 3) | ((address_expr->X_add_number & 0xf800000) >> 7) | ((address_expr->X_add_number & 0x3fffc) >> 2)); ip->complete_p = 1; break; case BFD_RELOC_16_PCREL_S2: { int shift; shift = mips_opts.micromips ? 1 : 2; if ((address_expr->X_add_number & ((1 << shift) - 1)) != 0) as_bad (_("branch to misaligned address (0x%lx)"), (unsigned long) address_expr->X_add_number); if (!mips_relax_branch) { if ((address_expr->X_add_number + (1 << (shift + 15))) & ~((1 << (shift + 16)) - 1)) as_bad (_("branch address range overflow (0x%lx)"), (unsigned long) address_expr->X_add_number); ip->insn_opcode |= ((address_expr->X_add_number >> shift) & 0xffff); } } break; case BFD_RELOC_MIPS_21_PCREL_S2: { int shift; shift = 2; if ((address_expr->X_add_number & ((1 << shift) - 1)) != 0) as_bad (_("branch to misaligned address (0x%lx)"), (unsigned long) address_expr->X_add_number); if ((address_expr->X_add_number + (1 << (shift + 20))) & ~((1 << (shift + 21)) - 1)) as_bad (_("branch address range overflow (0x%lx)"), (unsigned long) address_expr->X_add_number); ip->insn_opcode |= ((address_expr->X_add_number >> shift) & 0x1fffff); } break; case BFD_RELOC_MIPS_26_PCREL_S2: { int shift; shift = 2; if ((address_expr->X_add_number & ((1 << shift) - 1)) != 0) as_bad (_("branch to misaligned address (0x%lx)"), (unsigned long) address_expr->X_add_number); if ((address_expr->X_add_number + (1 << (shift + 25))) & ~((1 << (shift + 26)) - 1)) as_bad (_("branch address range overflow (0x%lx)"), (unsigned long) address_expr->X_add_number); ip->insn_opcode |= ((address_expr->X_add_number >> shift) & 0x3ffffff); } break; default: { offsetT value; if (calculate_reloc (*reloc_type, address_expr->X_add_number, &value)) { ip->insn_opcode |= value & 0xffff; ip->complete_p = 1; } } break; } } if (mips_relax.sequence != 2 && !mips_opts.noreorder) { /* There are a lot of optimizations we could do that we don't. In particular, we do not, in general, reorder instructions. If you use gcc with optimization, it will reorder instructions and generally do much more optimization then we do here; repeating all that work in the assembler would only benefit hand written assembly code, and does not seem worth it. */ int nops = (mips_optimize == 0 ? nops_for_insn (0, history, NULL) : nops_for_insn_or_target (0, history, ip)); if (nops > 0) { fragS *old_frag; unsigned long old_frag_offset; int i; old_frag = frag_now; old_frag_offset = frag_now_fix (); for (i = 0; i < nops; i++) add_fixed_insn (NOP_INSN); insert_into_history (0, nops, NOP_INSN); if (listing) { listing_prev_line (); /* We may be at the start of a variant frag. In case we are, make sure there is enough space for the frag after the frags created by listing_prev_line. The argument to frag_grow here must be at least as large as the argument to all other calls to frag_grow in this file. We don't have to worry about being in the middle of a variant frag, because the variants insert all needed nop instructions themselves. */ frag_grow (40); } mips_move_text_labels (); #ifndef NO_ECOFF_DEBUGGING if (ECOFF_DEBUGGING) ecoff_fix_loc (old_frag, old_frag_offset); #endif } } else if (mips_relax.sequence != 2 && prev_nop_frag != NULL) { int nops; /* Work out how many nops in prev_nop_frag are needed by IP, ignoring hazards generated by the first prev_nop_frag_since instructions. */ nops = nops_for_insn_or_target (prev_nop_frag_since, history, ip); gas_assert (nops <= prev_nop_frag_holds); /* Enforce NOPS as a minimum. */ if (nops > prev_nop_frag_required) prev_nop_frag_required = nops; if (prev_nop_frag_holds == prev_nop_frag_required) { /* Settle for the current number of nops. Update the history accordingly (for the benefit of any future .set reorder code). */ prev_nop_frag = NULL; insert_into_history (prev_nop_frag_since, prev_nop_frag_holds, NOP_INSN); } else { /* Allow this instruction to replace one of the nops that was tentatively added to prev_nop_frag. */ prev_nop_frag->fr_fix -= NOP_INSN_SIZE; prev_nop_frag_holds--; prev_nop_frag_since++; } } method = get_append_method (ip, address_expr, reloc_type); branch_disp = method == APPEND_SWAP ? insn_length (history) : 0; dwarf2_emit_insn (0); /* We want MIPS16 and microMIPS debug info to use ISA-encoded addresses, so "move" the instruction address accordingly. Also, it doesn't seem appropriate for the assembler to reorder .loc entries. If this instruction is a branch that we are going to swap with the previous instruction, the two instructions should be treated as a unit, and the debug information for both instructions should refer to the start of the branch sequence. Using the current position is certainly wrong when swapping a 32-bit branch and a 16-bit delay slot, since the current position would then be in the middle of a branch. */ dwarf2_move_insn ((HAVE_CODE_COMPRESSION ? 1 : 0) - branch_disp); relax32 = (mips_relax_branch /* Don't try branch relaxation within .set nomacro, or within .set noat if we use $at for PIC computations. If it turns out that the branch was out-of-range, we'll get an error. */ && !mips_opts.warn_about_macros && (mips_opts.at || mips_pic == NO_PIC) /* Don't relax BPOSGE32/64 or BC1ANY2T/F and BC1ANY4T/F as they have no complementing branches. */ && !(ip->insn_mo->ase & (ASE_MIPS3D | ASE_DSP64 | ASE_DSP))); if (!HAVE_CODE_COMPRESSION && address_expr && relax32 && *reloc_type == BFD_RELOC_16_PCREL_S2 && delayed_branch_p (ip)) { relaxed_branch = TRUE; add_relaxed_insn (ip, (relaxed_branch_length (NULL, NULL, uncond_branch_p (ip) ? -1 : branch_likely_p (ip) ? 1 : 0)), 4, RELAX_BRANCH_ENCODE (AT, uncond_branch_p (ip), branch_likely_p (ip), pinfo & INSN_WRITE_GPR_31, 0), address_expr->X_add_symbol, address_expr->X_add_number); *reloc_type = BFD_RELOC_UNUSED; } else if (mips_opts.micromips && address_expr && ((relax32 && *reloc_type == BFD_RELOC_16_PCREL_S2) || *reloc_type > BFD_RELOC_UNUSED) && (delayed_branch_p (ip) || compact_branch_p (ip)) /* Don't try branch relaxation when users specify 16-bit/32-bit instructions. */ && !forced_insn_length) { bfd_boolean relax16 = (method != APPEND_ADD_COMPACT && *reloc_type > BFD_RELOC_UNUSED); int type = relax16 ? *reloc_type - BFD_RELOC_UNUSED : 0; int uncond = uncond_branch_p (ip) ? -1 : 0; int compact = compact_branch_p (ip) || method == APPEND_ADD_COMPACT; int nods = method == APPEND_ADD_WITH_NOP; int al = pinfo & INSN_WRITE_GPR_31; int length32 = nods ? 8 : 4; gas_assert (address_expr != NULL); gas_assert (!mips_relax.sequence); relaxed_branch = TRUE; if (nods) method = APPEND_ADD; if (relax32) length32 = relaxed_micromips_32bit_branch_length (NULL, NULL, uncond); add_relaxed_insn (ip, length32, relax16 ? 2 : 4, RELAX_MICROMIPS_ENCODE (type, AT, mips_opts.insn32, uncond, compact, al, nods, relax32, 0, 0), address_expr->X_add_symbol, address_expr->X_add_number); *reloc_type = BFD_RELOC_UNUSED; } else if (mips_opts.mips16 && *reloc_type > BFD_RELOC_UNUSED) { bfd_boolean require_unextended; bfd_boolean require_extended; symbolS *symbol; offsetT offset; if (forced_insn_length != 0) { require_unextended = forced_insn_length == 2; require_extended = forced_insn_length == 4; } else { require_unextended = (mips_opts.noautoextend && !mips_opcode_32bit_p (ip->insn_mo)); require_extended = 0; } /* We need to set up a variant frag. */ gas_assert (address_expr != NULL); /* Pass any `O_symbol' expression unchanged as an `expr_section' symbol created by `make_expr_symbol' may not get a necessary external relocation produced. */ if (address_expr->X_op == O_symbol) { symbol = address_expr->X_add_symbol; offset = address_expr->X_add_number; } else { symbol = make_expr_symbol (address_expr); offset = 0; } add_relaxed_insn (ip, 4, 0, RELAX_MIPS16_ENCODE (*reloc_type - BFD_RELOC_UNUSED, require_unextended, require_extended, delayed_branch_p (&history[0]), history[0].mips16_absolute_jump_p), symbol, offset); } else if (mips_opts.mips16 && insn_length (ip) == 2) { if (!delayed_branch_p (ip)) /* Make sure there is enough room to swap this instruction with a following jump instruction. */ frag_grow (6); add_fixed_insn (ip); } else { if (mips_opts.mips16 && mips_opts.noreorder && delayed_branch_p (&history[0])) as_warn (_("extended instruction in delay slot")); if (mips_relax.sequence) { /* If we've reached the end of this frag, turn it into a variant frag and record the information for the instructions we've written so far. */ if (frag_room () < 4) relax_close_frag (); mips_relax.sizes[mips_relax.sequence - 1] += insn_length (ip); } if (mips_relax.sequence != 2) { if (mips_macro_warning.first_insn_sizes[0] == 0) mips_macro_warning.first_insn_sizes[0] = insn_length (ip); mips_macro_warning.sizes[0] += insn_length (ip); mips_macro_warning.insns[0]++; } if (mips_relax.sequence != 1) { if (mips_macro_warning.first_insn_sizes[1] == 0) mips_macro_warning.first_insn_sizes[1] = insn_length (ip); mips_macro_warning.sizes[1] += insn_length (ip); mips_macro_warning.insns[1]++; } if (mips_opts.mips16) { ip->fixed_p = 1; ip->mips16_absolute_jump_p = (*reloc_type == BFD_RELOC_MIPS16_JMP); } add_fixed_insn (ip); } if (!ip->complete_p && *reloc_type < BFD_RELOC_UNUSED) { bfd_reloc_code_real_type final_type[3]; reloc_howto_type *howto0; reloc_howto_type *howto; int i; /* Perform any necessary conversion to microMIPS relocations and find out how many relocations there actually are. */ for (i = 0; i < 3 && reloc_type[i] != BFD_RELOC_UNUSED; i++) final_type[i] = micromips_map_reloc (reloc_type[i]); /* In a compound relocation, it is the final (outermost) operator that determines the relocated field. */ howto = howto0 = bfd_reloc_type_lookup (stdoutput, final_type[i - 1]); if (!howto) abort (); if (i > 1) howto0 = bfd_reloc_type_lookup (stdoutput, final_type[0]); ip->fixp[0] = fix_new_exp (ip->frag, ip->where, bfd_get_reloc_size (howto), address_expr, howto0 && howto0->pc_relative, final_type[0]); /* Tag symbols that have a R_MIPS16_26 relocation against them. */ if (final_type[0] == BFD_RELOC_MIPS16_JMP && ip->fixp[0]->fx_addsy) *symbol_get_tc (ip->fixp[0]->fx_addsy) = 1; /* These relocations can have an addend that won't fit in 4 octets for 64bit assembly. */ if (GPR_SIZE == 64 && ! howto->partial_inplace && (reloc_type[0] == BFD_RELOC_16 || reloc_type[0] == BFD_RELOC_32 || reloc_type[0] == BFD_RELOC_MIPS_JMP || reloc_type[0] == BFD_RELOC_GPREL16 || reloc_type[0] == BFD_RELOC_MIPS_LITERAL || reloc_type[0] == BFD_RELOC_GPREL32 || reloc_type[0] == BFD_RELOC_64 || reloc_type[0] == BFD_RELOC_CTOR || reloc_type[0] == BFD_RELOC_MIPS_SUB || reloc_type[0] == BFD_RELOC_MIPS_HIGHEST || reloc_type[0] == BFD_RELOC_MIPS_HIGHER || reloc_type[0] == BFD_RELOC_MIPS_SCN_DISP || reloc_type[0] == BFD_RELOC_MIPS_REL16 || reloc_type[0] == BFD_RELOC_MIPS_RELGOT || reloc_type[0] == BFD_RELOC_MIPS16_GPREL || hi16_reloc_p (reloc_type[0]) || lo16_reloc_p (reloc_type[0]))) ip->fixp[0]->fx_no_overflow = 1; /* These relocations can have an addend that won't fit in 2 octets. */ if (reloc_type[0] == BFD_RELOC_MICROMIPS_7_PCREL_S1 || reloc_type[0] == BFD_RELOC_MICROMIPS_10_PCREL_S1) ip->fixp[0]->fx_no_overflow = 1; if (mips_relax.sequence) { if (mips_relax.first_fixup == 0) mips_relax.first_fixup = ip->fixp[0]; } else if (reloc_needs_lo_p (*reloc_type)) { struct mips_hi_fixup *hi_fixup; /* Reuse the last entry if it already has a matching %lo. */ hi_fixup = mips_hi_fixup_list; if (hi_fixup == 0 || !fixup_has_matching_lo_p (hi_fixup->fixp)) { hi_fixup = XNEW (struct mips_hi_fixup); hi_fixup->next = mips_hi_fixup_list; mips_hi_fixup_list = hi_fixup; } hi_fixup->fixp = ip->fixp[0]; hi_fixup->seg = now_seg; } /* Add fixups for the second and third relocations, if given. Note that the ABI allows the second relocation to be against RSS_UNDEF, RSS_GP, RSS_GP0 or RSS_LOC. At the moment we only use RSS_UNDEF, but we could add support for the others if it ever becomes necessary. */ for (i = 1; i < 3; i++) if (reloc_type[i] != BFD_RELOC_UNUSED) { ip->fixp[i] = fix_new (ip->frag, ip->where, ip->fixp[0]->fx_size, NULL, 0, FALSE, final_type[i]); /* Use fx_tcbit to mark compound relocs. */ ip->fixp[0]->fx_tcbit = 1; ip->fixp[i]->fx_tcbit = 1; } } /* Update the register mask information. */ mips_gprmask |= gpr_read_mask (ip) | gpr_write_mask (ip); mips_cprmask[1] |= fpr_read_mask (ip) | fpr_write_mask (ip); switch (method) { case APPEND_ADD: insert_into_history (0, 1, ip); break; case APPEND_ADD_WITH_NOP: { struct mips_cl_insn *nop; insert_into_history (0, 1, ip); nop = get_delay_slot_nop (ip); add_fixed_insn (nop); insert_into_history (0, 1, nop); if (mips_relax.sequence) mips_relax.sizes[mips_relax.sequence - 1] += insn_length (nop); } break; case APPEND_ADD_COMPACT: /* Convert MIPS16 jr/jalr into a "compact" jump. */ if (mips_opts.mips16) { ip->insn_opcode |= 0x0080; find_altered_mips16_opcode (ip); } /* Convert microMIPS instructions. */ else if (mips_opts.micromips) { /* jr16->jrc */ if ((ip->insn_opcode & 0xffe0) == 0x4580) ip->insn_opcode |= 0x0020; /* b16->bc */ else if ((ip->insn_opcode & 0xfc00) == 0xcc00) ip->insn_opcode = 0x40e00000; /* beqz16->beqzc, bnez16->bnezc */ else if ((ip->insn_opcode & 0xdc00) == 0x8c00) { unsigned long regno; regno = ip->insn_opcode >> MICROMIPSOP_SH_MD; regno &= MICROMIPSOP_MASK_MD; regno = micromips_to_32_reg_d_map[regno]; ip->insn_opcode = (((ip->insn_opcode << 9) & 0x00400000) | (regno << MICROMIPSOP_SH_RS) | 0x40a00000) ^ 0x00400000; } /* beqz->beqzc, bnez->bnezc */ else if ((ip->insn_opcode & 0xdfe00000) == 0x94000000) ip->insn_opcode = ((ip->insn_opcode & 0x001f0000) | ((ip->insn_opcode >> 7) & 0x00400000) | 0x40a00000) ^ 0x00400000; /* beq $0->beqzc, bne $0->bnezc */ else if ((ip->insn_opcode & 0xdc1f0000) == 0x94000000) ip->insn_opcode = (((ip->insn_opcode >> (MICROMIPSOP_SH_RT - MICROMIPSOP_SH_RS)) & (MICROMIPSOP_MASK_RS << MICROMIPSOP_SH_RS)) | ((ip->insn_opcode >> 7) & 0x00400000) | 0x40a00000) ^ 0x00400000; else abort (); find_altered_micromips_opcode (ip); } else abort (); install_insn (ip); insert_into_history (0, 1, ip); break; case APPEND_SWAP: { struct mips_cl_insn delay = history[0]; if (relaxed_branch || delay.frag != ip->frag) { /* Add the delay slot instruction to the end of the current frag and shrink the fixed part of the original frag. If the branch occupies the tail of the latter, move it backwards to cover the gap. */ delay.frag->fr_fix -= branch_disp; if (delay.frag == ip->frag) move_insn (ip, ip->frag, ip->where - branch_disp); add_fixed_insn (&delay); } else { /* If this is not a relaxed branch and we are in the same frag, then just swap the instructions. */ move_insn (ip, delay.frag, delay.where); move_insn (&delay, ip->frag, ip->where + insn_length (ip)); } history[0] = *ip; delay.fixed_p = 1; insert_into_history (0, 1, &delay); } break; } /* If we have just completed an unconditional branch, clear the history. */ if ((delayed_branch_p (&history[1]) && uncond_branch_p (&history[1])) || (compact_branch_p (&history[0]) && uncond_branch_p (&history[0]))) { unsigned int i; mips_no_prev_insn (); for (i = 0; i < ARRAY_SIZE (history); i++) history[i].cleared_p = 1; } /* We need to emit a label at the end of branch-likely macros. */ if (emit_branch_likely_macro) { emit_branch_likely_macro = FALSE; micromips_add_label (); } /* We just output an insn, so the next one doesn't have a label. */ mips_clear_insn_labels (); } /* Forget that there was any previous instruction or label. When BRANCH is true, the branch history is also flushed. */ static void mips_no_prev_insn (void) { prev_nop_frag = NULL; insert_into_history (0, ARRAY_SIZE (history), NOP_INSN); mips_clear_insn_labels (); } /* This function must be called before we emit something other than instructions. It is like mips_no_prev_insn except that it inserts any NOPS that might be needed by previous instructions. */ void mips_emit_delays (void) { if (! mips_opts.noreorder) { int nops = nops_for_insn (0, history, NULL); if (nops > 0) { while (nops-- > 0) add_fixed_insn (NOP_INSN); mips_move_text_labels (); } } mips_no_prev_insn (); } /* Start a (possibly nested) noreorder block. */ static void start_noreorder (void) { if (mips_opts.noreorder == 0) { unsigned int i; int nops; /* None of the instructions before the .set noreorder can be moved. */ for (i = 0; i < ARRAY_SIZE (history); i++) history[i].fixed_p = 1; /* Insert any nops that might be needed between the .set noreorder block and the previous instructions. We will later remove any nops that turn out not to be needed. */ nops = nops_for_insn (0, history, NULL); if (nops > 0) { if (mips_optimize != 0) { /* Record the frag which holds the nop instructions, so that we can remove them if we don't need them. */ frag_grow (nops * NOP_INSN_SIZE); prev_nop_frag = frag_now; prev_nop_frag_holds = nops; prev_nop_frag_required = 0; prev_nop_frag_since = 0; } for (; nops > 0; --nops) add_fixed_insn (NOP_INSN); /* Move on to a new frag, so that it is safe to simply decrease the size of prev_nop_frag. */ frag_wane (frag_now); frag_new (0); mips_move_text_labels (); } mips_mark_labels (); mips_clear_insn_labels (); } mips_opts.noreorder++; mips_any_noreorder = 1; } /* End a nested noreorder block. */ static void end_noreorder (void) { mips_opts.noreorder--; if (mips_opts.noreorder == 0 && prev_nop_frag != NULL) { /* Commit to inserting prev_nop_frag_required nops and go back to handling nop insertion the .set reorder way. */ prev_nop_frag->fr_fix -= ((prev_nop_frag_holds - prev_nop_frag_required) * NOP_INSN_SIZE); insert_into_history (prev_nop_frag_since, prev_nop_frag_required, NOP_INSN); prev_nop_frag = NULL; } } /* Sign-extend 32-bit mode constants that have bit 31 set and all higher bits unset. */ static void normalize_constant_expr (expressionS *ex) { if (ex->X_op == O_constant && IS_ZEXT_32BIT_NUM (ex->X_add_number)) ex->X_add_number = (((ex->X_add_number & 0xffffffff) ^ 0x80000000) - 0x80000000); } /* Sign-extend 32-bit mode address offsets that have bit 31 set and all higher bits unset. */ static void normalize_address_expr (expressionS *ex) { if (((ex->X_op == O_constant && HAVE_32BIT_ADDRESSES) || (ex->X_op == O_symbol && HAVE_32BIT_SYMBOLS)) && IS_ZEXT_32BIT_NUM (ex->X_add_number)) ex->X_add_number = (((ex->X_add_number & 0xffffffff) ^ 0x80000000) - 0x80000000); } /* Try to match TOKENS against OPCODE, storing the result in INSN. Return true if the match was successful. OPCODE_EXTRA is a value that should be ORed into the opcode (used for VU0 channel suffixes, etc.). MORE_ALTS is true if there are more alternatives after OPCODE and SOFT_MATCH is as for mips_arg_info. */ static bfd_boolean match_insn (struct mips_cl_insn *insn, const struct mips_opcode *opcode, struct mips_operand_token *tokens, unsigned int opcode_extra, bfd_boolean lax_match, bfd_boolean complete_p) { const char *args; struct mips_arg_info arg; const struct mips_operand *operand; char c; imm_expr.X_op = O_absent; offset_expr.X_op = O_absent; offset_reloc[0] = BFD_RELOC_UNUSED; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; create_insn (insn, opcode); /* When no opcode suffix is specified, assume ".xyzw". */ if ((opcode->pinfo2 & INSN2_VU0_CHANNEL_SUFFIX) != 0 && opcode_extra == 0) insn->insn_opcode |= 0xf << mips_vu0_channel_mask.lsb; else insn->insn_opcode |= opcode_extra; memset (&arg, 0, sizeof (arg)); arg.insn = insn; arg.token = tokens; arg.argnum = 1; arg.last_regno = ILLEGAL_REG; arg.dest_regno = ILLEGAL_REG; arg.lax_match = lax_match; for (args = opcode->args;; ++args) { if (arg.token->type == OT_END) { /* Handle unary instructions in which only one operand is given. The source is then the same as the destination. */ if (arg.opnum == 1 && *args == ',') { operand = (mips_opts.micromips ? decode_micromips_operand (args + 1) : decode_mips_operand (args + 1)); if (operand && mips_optional_operand_p (operand)) { arg.token = tokens; arg.argnum = 1; continue; } } /* Treat elided base registers as $0. */ if (strcmp (args, "(b)") == 0) args += 3; if (args[0] == '+') switch (args[1]) { case 'K': case 'N': /* The register suffix is optional. */ args += 2; break; } /* Fail the match if there were too few operands. */ if (*args) return FALSE; /* Successful match. */ if (!complete_p) return TRUE; clear_insn_error (); if (arg.dest_regno == arg.last_regno && strncmp (insn->insn_mo->name, "jalr", 4) == 0) { if (arg.opnum == 2) set_insn_error (0, _("source and destination must be different")); else if (arg.last_regno == 31) set_insn_error (0, _("a destination register must be supplied")); } else if (arg.last_regno == 31 && (strncmp (insn->insn_mo->name, "bltzal", 6) == 0 || strncmp (insn->insn_mo->name, "bgezal", 6) == 0)) set_insn_error (0, _("the source register must not be $31")); check_completed_insn (&arg); return TRUE; } /* Fail the match if the line has too many operands. */ if (*args == 0) return FALSE; /* Handle characters that need to match exactly. */ if (*args == '(' || *args == ')' || *args == ',') { if (match_char (&arg, *args)) continue; return FALSE; } if (*args == '#') { ++args; if (arg.token->type == OT_DOUBLE_CHAR && arg.token->u.ch == *args) { ++arg.token; continue; } return FALSE; } /* Handle special macro operands. Work out the properties of other operands. */ arg.opnum += 1; switch (*args) { case '-': switch (args[1]) { case 'A': *offset_reloc = BFD_RELOC_MIPS_19_PCREL_S2; break; case 'B': *offset_reloc = BFD_RELOC_MIPS_18_PCREL_S3; break; } break; case '+': switch (args[1]) { case 'i': *offset_reloc = BFD_RELOC_MIPS_JMP; break; case '\'': *offset_reloc = BFD_RELOC_MIPS_26_PCREL_S2; break; case '\"': *offset_reloc = BFD_RELOC_MIPS_21_PCREL_S2; break; } break; case 'I': if (!match_const_int (&arg, &imm_expr.X_add_number)) return FALSE; imm_expr.X_op = O_constant; if (GPR_SIZE == 32) normalize_constant_expr (&imm_expr); continue; case 'A': if (arg.token->type == OT_CHAR && arg.token->u.ch == '(') { /* Assume that the offset has been elided and that what we saw was a base register. The match will fail later if that assumption turns out to be wrong. */ offset_expr.X_op = O_constant; offset_expr.X_add_number = 0; } else { if (!match_expression (&arg, &offset_expr, offset_reloc)) return FALSE; normalize_address_expr (&offset_expr); } continue; case 'F': if (!match_float_constant (&arg, &imm_expr, &offset_expr, 8, TRUE)) return FALSE; continue; case 'L': if (!match_float_constant (&arg, &imm_expr, &offset_expr, 8, FALSE)) return FALSE; continue; case 'f': if (!match_float_constant (&arg, &imm_expr, &offset_expr, 4, TRUE)) return FALSE; continue; case 'l': if (!match_float_constant (&arg, &imm_expr, &offset_expr, 4, FALSE)) return FALSE; continue; case 'p': *offset_reloc = BFD_RELOC_16_PCREL_S2; break; case 'a': *offset_reloc = BFD_RELOC_MIPS_JMP; break; case 'm': gas_assert (mips_opts.micromips); c = args[1]; switch (c) { case 'D': case 'E': if (!forced_insn_length) *offset_reloc = (int) BFD_RELOC_UNUSED + c; else if (c == 'D') *offset_reloc = BFD_RELOC_MICROMIPS_10_PCREL_S1; else *offset_reloc = BFD_RELOC_MICROMIPS_7_PCREL_S1; break; } break; } operand = (mips_opts.micromips ? decode_micromips_operand (args) : decode_mips_operand (args)); if (!operand) abort (); /* Skip prefixes. */ if (*args == '+' || *args == 'm' || *args == '-') args++; if (mips_optional_operand_p (operand) && args[1] == ',' && (arg.token[0].type != OT_REG || arg.token[1].type == OT_END)) { /* Assume that the register has been elided and is the same as the first operand. */ arg.token = tokens; arg.argnum = 1; } if (!match_operand (&arg, operand)) return FALSE; } } /* Like match_insn, but for MIPS16. */ static bfd_boolean match_mips16_insn (struct mips_cl_insn *insn, const struct mips_opcode *opcode, struct mips_operand_token *tokens) { const char *args; const struct mips_operand *operand; const struct mips_operand *ext_operand; int required_insn_length; struct mips_arg_info arg; int relax_char; if (forced_insn_length) required_insn_length = forced_insn_length; else if (mips_opts.noautoextend && !mips_opcode_32bit_p (opcode)) required_insn_length = 2; else required_insn_length = 0; create_insn (insn, opcode); imm_expr.X_op = O_absent; offset_expr.X_op = O_absent; offset_reloc[0] = BFD_RELOC_UNUSED; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; relax_char = 0; memset (&arg, 0, sizeof (arg)); arg.insn = insn; arg.token = tokens; arg.argnum = 1; arg.last_regno = ILLEGAL_REG; arg.dest_regno = ILLEGAL_REG; relax_char = 0; for (args = opcode->args;; ++args) { int c; if (arg.token->type == OT_END) { offsetT value; /* Handle unary instructions in which only one operand is given. The source is then the same as the destination. */ if (arg.opnum == 1 && *args == ',') { operand = decode_mips16_operand (args[1], FALSE); if (operand && mips_optional_operand_p (operand)) { arg.token = tokens; arg.argnum = 1; continue; } } /* Fail the match if there were too few operands. */ if (*args) return FALSE; /* Successful match. Stuff the immediate value in now, if we can. */ clear_insn_error (); if (opcode->pinfo == INSN_MACRO) { gas_assert (relax_char == 0 || relax_char == 'p'); gas_assert (*offset_reloc == BFD_RELOC_UNUSED); } else if (relax_char && offset_expr.X_op == O_constant && calculate_reloc (*offset_reloc, offset_expr.X_add_number, &value)) { mips16_immed (NULL, 0, relax_char, *offset_reloc, value, required_insn_length, &insn->insn_opcode); offset_expr.X_op = O_absent; *offset_reloc = BFD_RELOC_UNUSED; } else if (relax_char && *offset_reloc != BFD_RELOC_UNUSED) { if (required_insn_length == 2) set_insn_error (0, _("invalid unextended operand value")); forced_insn_length = 4; insn->insn_opcode |= MIPS16_EXTEND; } else if (relax_char) *offset_reloc = (int) BFD_RELOC_UNUSED + relax_char; check_completed_insn (&arg); return TRUE; } /* Fail the match if the line has too many operands. */ if (*args == 0) return FALSE; /* Handle characters that need to match exactly. */ if (*args == '(' || *args == ')' || *args == ',') { if (match_char (&arg, *args)) continue; return FALSE; } arg.opnum += 1; c = *args; switch (c) { case 'p': case 'q': case 'A': case 'B': case 'E': relax_char = c; break; case 'I': if (!match_const_int (&arg, &imm_expr.X_add_number)) return FALSE; imm_expr.X_op = O_constant; if (GPR_SIZE == 32) normalize_constant_expr (&imm_expr); continue; case 'a': case 'i': *offset_reloc = BFD_RELOC_MIPS16_JMP; break; } operand = decode_mips16_operand (c, mips_opcode_32bit_p (opcode)); if (!operand) abort (); /* '6' is a special case. It is used for BREAK and SDBBP, whose operands are only meaningful to the software that decodes them. This means that there is no architectural reason why they cannot be prefixed by EXTEND, but in practice, exception handlers will only look at the instruction itself. We therefore allow '6' to be extended when disassembling but not when assembling. */ if (operand->type != OP_PCREL && c != '6') { ext_operand = decode_mips16_operand (c, TRUE); if (operand != ext_operand) { if (arg.token->type == OT_CHAR && arg.token->u.ch == '(') { offset_expr.X_op = O_constant; offset_expr.X_add_number = 0; relax_char = c; continue; } /* We need the OT_INTEGER check because some MIPS16 immediate variants are listed before the register ones. */ if (arg.token->type != OT_INTEGER || !match_expression (&arg, &offset_expr, offset_reloc)) return FALSE; /* '8' is used for SLTI(U) and has traditionally not been allowed to take relocation operators. */ if (offset_reloc[0] != BFD_RELOC_UNUSED && (ext_operand->size != 16 || c == '8')) return FALSE; relax_char = c; continue; } } if (mips_optional_operand_p (operand) && args[1] == ',' && (arg.token[0].type != OT_REG || arg.token[1].type == OT_END)) { /* Assume that the register has been elided and is the same as the first operand. */ arg.token = tokens; arg.argnum = 1; } if (!match_operand (&arg, operand)) return FALSE; } } /* Record that the current instruction is invalid for the current ISA. */ static void match_invalid_for_isa (void) { set_insn_error_ss (0, _("opcode not supported on this processor: %s (%s)"), mips_cpu_info_from_arch (mips_opts.arch)->name, mips_cpu_info_from_isa (mips_opts.isa)->name); } /* Try to match TOKENS against a series of opcode entries, starting at FIRST. Return true if a definite match or failure was found, storing any match in INSN. OPCODE_EXTRA is a value that should be ORed into the opcode (to handle things like VU0 suffixes). LAX_MATCH is true if we have already tried and failed to match under normal conditions and now want to try a more relaxed match. */ static bfd_boolean match_insns (struct mips_cl_insn *insn, const struct mips_opcode *first, const struct mips_opcode *past, struct mips_operand_token *tokens, int opcode_extra, bfd_boolean lax_match) { const struct mips_opcode *opcode; const struct mips_opcode *invalid_delay_slot; bfd_boolean seen_valid_for_isa, seen_valid_for_size; /* Search for a match, ignoring alternatives that don't satisfy the current ISA or forced_length. */ invalid_delay_slot = 0; seen_valid_for_isa = FALSE; seen_valid_for_size = FALSE; opcode = first; do { gas_assert (strcmp (opcode->name, first->name) == 0); if (is_opcode_valid (opcode)) { seen_valid_for_isa = TRUE; if (is_size_valid (opcode)) { bfd_boolean delay_slot_ok; seen_valid_for_size = TRUE; delay_slot_ok = is_delay_slot_valid (opcode); if (match_insn (insn, opcode, tokens, opcode_extra, lax_match, delay_slot_ok)) { if (!delay_slot_ok) { if (!invalid_delay_slot) invalid_delay_slot = opcode; } else return TRUE; } } } ++opcode; } while (opcode < past && strcmp (opcode->name, first->name) == 0); /* If the only matches we found had the wrong length for the delay slot, pick the first such match. We'll issue an appropriate warning later. */ if (invalid_delay_slot) { if (match_insn (insn, invalid_delay_slot, tokens, opcode_extra, lax_match, TRUE)) return TRUE; abort (); } /* Handle the case where we didn't try to match an instruction because all the alternatives were incompatible with the current ISA. */ if (!seen_valid_for_isa) { match_invalid_for_isa (); return TRUE; } /* Handle the case where we didn't try to match an instruction because all the alternatives were of the wrong size. */ if (!seen_valid_for_size) { if (mips_opts.insn32) set_insn_error (0, _("opcode not supported in the `insn32' mode")); else set_insn_error_i (0, _("unrecognized %d-bit version of microMIPS opcode"), 8 * forced_insn_length); return TRUE; } return FALSE; } /* Like match_insns, but for MIPS16. */ static bfd_boolean match_mips16_insns (struct mips_cl_insn *insn, const struct mips_opcode *first, struct mips_operand_token *tokens) { const struct mips_opcode *opcode; bfd_boolean seen_valid_for_isa; bfd_boolean seen_valid_for_size; /* Search for a match, ignoring alternatives that don't satisfy the current ISA. There are no separate entries for extended forms so we deal with forced_length later. */ seen_valid_for_isa = FALSE; seen_valid_for_size = FALSE; opcode = first; do { gas_assert (strcmp (opcode->name, first->name) == 0); if (is_opcode_valid_16 (opcode)) { seen_valid_for_isa = TRUE; if (is_size_valid_16 (opcode)) { seen_valid_for_size = TRUE; if (match_mips16_insn (insn, opcode, tokens)) return TRUE; } } ++opcode; } while (opcode < &mips16_opcodes[bfd_mips16_num_opcodes] && strcmp (opcode->name, first->name) == 0); /* Handle the case where we didn't try to match an instruction because all the alternatives were incompatible with the current ISA. */ if (!seen_valid_for_isa) { match_invalid_for_isa (); return TRUE; } /* Handle the case where we didn't try to match an instruction because all the alternatives were of the wrong size. */ if (!seen_valid_for_size) { if (forced_insn_length == 2) set_insn_error (0, _("unrecognized unextended version of MIPS16 opcode")); else set_insn_error (0, _("unrecognized extended version of MIPS16 opcode")); return TRUE; } return FALSE; } /* Set up global variables for the start of a new macro. */ static void macro_start (void) { memset (&mips_macro_warning.sizes, 0, sizeof (mips_macro_warning.sizes)); memset (&mips_macro_warning.first_insn_sizes, 0, sizeof (mips_macro_warning.first_insn_sizes)); memset (&mips_macro_warning.insns, 0, sizeof (mips_macro_warning.insns)); mips_macro_warning.delay_slot_p = (mips_opts.noreorder && delayed_branch_p (&history[0])); if (history[0].frag && history[0].frag->fr_type == rs_machine_dependent && RELAX_MICROMIPS_P (history[0].frag->fr_subtype) && RELAX_MICROMIPS_NODS (history[0].frag->fr_subtype)) mips_macro_warning.delay_slot_length = 0; else switch (history[0].insn_mo->pinfo2 & (INSN2_BRANCH_DELAY_32BIT | INSN2_BRANCH_DELAY_16BIT)) { case INSN2_BRANCH_DELAY_32BIT: mips_macro_warning.delay_slot_length = 4; break; case INSN2_BRANCH_DELAY_16BIT: mips_macro_warning.delay_slot_length = 2; break; default: mips_macro_warning.delay_slot_length = 0; break; } mips_macro_warning.first_frag = NULL; } /* Given that a macro is longer than one instruction or of the wrong size, return the appropriate warning for it. Return null if no warning is needed. SUBTYPE is a bitmask of RELAX_DELAY_SLOT, RELAX_DELAY_SLOT_16BIT, RELAX_DELAY_SLOT_SIZE_FIRST, RELAX_DELAY_SLOT_SIZE_SECOND, and RELAX_NOMACRO. */ static const char * macro_warning (relax_substateT subtype) { if (subtype & RELAX_DELAY_SLOT) return _("macro instruction expanded into multiple instructions" " in a branch delay slot"); else if (subtype & RELAX_NOMACRO) return _("macro instruction expanded into multiple instructions"); else if (subtype & (RELAX_DELAY_SLOT_SIZE_FIRST | RELAX_DELAY_SLOT_SIZE_SECOND)) return ((subtype & RELAX_DELAY_SLOT_16BIT) ? _("macro instruction expanded into a wrong size instruction" " in a 16-bit branch delay slot") : _("macro instruction expanded into a wrong size instruction" " in a 32-bit branch delay slot")); else return 0; } /* Finish up a macro. Emit warnings as appropriate. */ static void macro_end (void) { /* Relaxation warning flags. */ relax_substateT subtype = 0; /* Check delay slot size requirements. */ if (mips_macro_warning.delay_slot_length == 2) subtype |= RELAX_DELAY_SLOT_16BIT; if (mips_macro_warning.delay_slot_length != 0) { if (mips_macro_warning.delay_slot_length != mips_macro_warning.first_insn_sizes[0]) subtype |= RELAX_DELAY_SLOT_SIZE_FIRST; if (mips_macro_warning.delay_slot_length != mips_macro_warning.first_insn_sizes[1]) subtype |= RELAX_DELAY_SLOT_SIZE_SECOND; } /* Check instruction count requirements. */ if (mips_macro_warning.insns[0] > 1 || mips_macro_warning.insns[1] > 1) { if (mips_macro_warning.insns[1] > mips_macro_warning.insns[0]) subtype |= RELAX_SECOND_LONGER; if (mips_opts.warn_about_macros) subtype |= RELAX_NOMACRO; if (mips_macro_warning.delay_slot_p) subtype |= RELAX_DELAY_SLOT; } /* If both alternatives fail to fill a delay slot correctly, emit the warning now. */ if ((subtype & RELAX_DELAY_SLOT_SIZE_FIRST) != 0 && (subtype & RELAX_DELAY_SLOT_SIZE_SECOND) != 0) { relax_substateT s; const char *msg; s = subtype & (RELAX_DELAY_SLOT_16BIT | RELAX_DELAY_SLOT_SIZE_FIRST | RELAX_DELAY_SLOT_SIZE_SECOND); msg = macro_warning (s); if (msg != NULL) as_warn ("%s", msg); subtype &= ~s; } /* If both implementations are longer than 1 instruction, then emit the warning now. */ if (mips_macro_warning.insns[0] > 1 && mips_macro_warning.insns[1] > 1) { relax_substateT s; const char *msg; s = subtype & (RELAX_SECOND_LONGER | RELAX_NOMACRO | RELAX_DELAY_SLOT); msg = macro_warning (s); if (msg != NULL) as_warn ("%s", msg); subtype &= ~s; } /* If any flags still set, then one implementation might need a warning and the other either will need one of a different kind or none at all. Pass any remaining flags over to relaxation. */ if (mips_macro_warning.first_frag != NULL) mips_macro_warning.first_frag->fr_subtype |= subtype; } /* Instruction operand formats used in macros that vary between standard MIPS and microMIPS code. */ static const char * const brk_fmt[2][2] = { { "c", "c" }, { "mF", "c" } }; static const char * const cop12_fmt[2] = { "E,o(b)", "E,~(b)" }; static const char * const jalr_fmt[2] = { "d,s", "t,s" }; static const char * const lui_fmt[2] = { "t,u", "s,u" }; static const char * const mem12_fmt[2] = { "t,o(b)", "t,~(b)" }; static const char * const mfhl_fmt[2][2] = { { "d", "d" }, { "mj", "s" } }; static const char * const shft_fmt[2] = { "d,w,<", "t,r,<" }; static const char * const trap_fmt[2] = { "s,t,q", "s,t,|" }; #define BRK_FMT (brk_fmt[mips_opts.micromips][mips_opts.insn32]) #define COP12_FMT (ISA_IS_R6 (mips_opts.isa) ? "E,+:(d)" \ : cop12_fmt[mips_opts.micromips]) #define JALR_FMT (jalr_fmt[mips_opts.micromips]) #define LUI_FMT (lui_fmt[mips_opts.micromips]) #define MEM12_FMT (mem12_fmt[mips_opts.micromips]) #define LL_SC_FMT (ISA_IS_R6 (mips_opts.isa) ? "t,+j(b)" \ : mem12_fmt[mips_opts.micromips]) #define MFHL_FMT (mfhl_fmt[mips_opts.micromips][mips_opts.insn32]) #define SHFT_FMT (shft_fmt[mips_opts.micromips]) #define TRAP_FMT (trap_fmt[mips_opts.micromips]) /* Read a macro's relocation codes from *ARGS and store them in *R. The first argument in *ARGS will be either the code for a single relocation or -1 followed by the three codes that make up a composite relocation. */ static void macro_read_relocs (va_list *args, bfd_reloc_code_real_type *r) { int i, next; next = va_arg (*args, int); if (next >= 0) r[0] = (bfd_reloc_code_real_type) next; else { for (i = 0; i < 3; i++) r[i] = (bfd_reloc_code_real_type) va_arg (*args, int); /* This function is only used for 16-bit relocation fields. To make the macro code simpler, treat an unrelocated value in the same way as BFD_RELOC_LO16. */ if (r[0] == BFD_RELOC_UNUSED) r[0] = BFD_RELOC_LO16; } } /* Build an instruction created by a macro expansion. This is passed a pointer to the count of instructions created so far, an expression, the name of the instruction to build, an operand format string, and corresponding arguments. */ static void macro_build (expressionS *ep, const char *name, const char *fmt, ...) { const struct mips_opcode *mo = NULL; bfd_reloc_code_real_type r[3]; const struct mips_opcode *amo; const struct mips_operand *operand; struct hash_control *hash; struct mips_cl_insn insn; va_list args; unsigned int uval; va_start (args, fmt); if (mips_opts.mips16) { mips16_macro_build (ep, name, fmt, &args); va_end (args); return; } r[0] = BFD_RELOC_UNUSED; r[1] = BFD_RELOC_UNUSED; r[2] = BFD_RELOC_UNUSED; hash = mips_opts.micromips ? micromips_op_hash : op_hash; amo = (struct mips_opcode *) hash_find (hash, name); gas_assert (amo); gas_assert (strcmp (name, amo->name) == 0); do { /* Search until we get a match for NAME. It is assumed here that macros will never generate MDMX, MIPS-3D, or MT instructions. We try to match an instruction that fulfils the branch delay slot instruction length requirement (if any) of the previous instruction. While doing this we record the first instruction seen that matches all the other conditions and use it anyway if the requirement cannot be met; we will issue an appropriate warning later on. */ if (strcmp (fmt, amo->args) == 0 && amo->pinfo != INSN_MACRO && is_opcode_valid (amo) && is_size_valid (amo)) { if (is_delay_slot_valid (amo)) { mo = amo; break; } else if (!mo) mo = amo; } ++amo; gas_assert (amo->name); } while (strcmp (name, amo->name) == 0); gas_assert (mo); create_insn (&insn, mo); for (; *fmt; ++fmt) { switch (*fmt) { case ',': case '(': case ')': case 'z': break; case 'i': case 'j': macro_read_relocs (&args, r); gas_assert (*r == BFD_RELOC_GPREL16 || *r == BFD_RELOC_MIPS_HIGHER || *r == BFD_RELOC_HI16_S || *r == BFD_RELOC_LO16 || *r == BFD_RELOC_MIPS_GOT_OFST); break; case 'o': macro_read_relocs (&args, r); break; case 'u': macro_read_relocs (&args, r); gas_assert (ep != NULL && (ep->X_op == O_constant || (ep->X_op == O_symbol && (*r == BFD_RELOC_MIPS_HIGHEST || *r == BFD_RELOC_HI16_S || *r == BFD_RELOC_HI16 || *r == BFD_RELOC_GPREL16 || *r == BFD_RELOC_MIPS_GOT_HI16 || *r == BFD_RELOC_MIPS_CALL_HI16)))); break; case 'p': gas_assert (ep != NULL); /* * This allows macro() to pass an immediate expression for * creating short branches without creating a symbol. * * We don't allow branch relaxation for these branches, as * they should only appear in ".set nomacro" anyway. */ if (ep->X_op == O_constant) { /* For microMIPS we always use relocations for branches. So we should not resolve immediate values. */ gas_assert (!mips_opts.micromips); if ((ep->X_add_number & 3) != 0) as_bad (_("branch to misaligned address (0x%lx)"), (unsigned long) ep->X_add_number); if ((ep->X_add_number + 0x20000) & ~0x3ffff) as_bad (_("branch address range overflow (0x%lx)"), (unsigned long) ep->X_add_number); insn.insn_opcode |= (ep->X_add_number >> 2) & 0xffff; ep = NULL; } else *r = BFD_RELOC_16_PCREL_S2; break; case 'a': gas_assert (ep != NULL); *r = BFD_RELOC_MIPS_JMP; break; default: operand = (mips_opts.micromips ? decode_micromips_operand (fmt) : decode_mips_operand (fmt)); if (!operand) abort (); uval = va_arg (args, int); if (operand->type == OP_CLO_CLZ_DEST) uval |= (uval << 5); insn_insert_operand (&insn, operand, uval); if (*fmt == '+' || *fmt == 'm' || *fmt == '-') ++fmt; break; } } va_end (args); gas_assert (*r == BFD_RELOC_UNUSED ? ep == NULL : ep != NULL); append_insn (&insn, ep, r, TRUE); } static void mips16_macro_build (expressionS *ep, const char *name, const char *fmt, va_list *args) { struct mips_opcode *mo; struct mips_cl_insn insn; const struct mips_operand *operand; bfd_reloc_code_real_type r[3] = {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED}; mo = (struct mips_opcode *) hash_find (mips16_op_hash, name); gas_assert (mo); gas_assert (strcmp (name, mo->name) == 0); while (strcmp (fmt, mo->args) != 0 || mo->pinfo == INSN_MACRO) { ++mo; gas_assert (mo->name); gas_assert (strcmp (name, mo->name) == 0); } create_insn (&insn, mo); for (; *fmt; ++fmt) { int c; c = *fmt; switch (c) { case ',': case '(': case ')': break; case '0': case 'S': case 'P': case 'R': break; case '<': case '4': case '5': case 'H': case 'W': case 'D': case 'j': case '8': case 'V': case 'C': case 'U': case 'k': case 'K': case 'p': case 'q': { offsetT value; gas_assert (ep != NULL); if (ep->X_op != O_constant) *r = (int) BFD_RELOC_UNUSED + c; else if (calculate_reloc (*r, ep->X_add_number, &value)) { mips16_immed (NULL, 0, c, *r, value, 0, &insn.insn_opcode); ep = NULL; *r = BFD_RELOC_UNUSED; } } break; default: operand = decode_mips16_operand (c, FALSE); if (!operand) abort (); insn_insert_operand (&insn, operand, va_arg (*args, int)); break; } } gas_assert (*r == BFD_RELOC_UNUSED ? ep == NULL : ep != NULL); append_insn (&insn, ep, r, TRUE); } /* * Generate a "jalr" instruction with a relocation hint to the called * function. This occurs in NewABI PIC code. */ static void macro_build_jalr (expressionS *ep, int cprestore) { static const bfd_reloc_code_real_type jalr_relocs[2] = { BFD_RELOC_MIPS_JALR, BFD_RELOC_MICROMIPS_JALR }; bfd_reloc_code_real_type jalr_reloc = jalr_relocs[mips_opts.micromips]; const char *jalr; char *f = NULL; if (MIPS_JALR_HINT_P (ep)) { frag_grow (8); f = frag_more (0); } if (mips_opts.micromips) { jalr = ((mips_opts.noreorder && !cprestore) || mips_opts.insn32 ? "jalr" : "jalrs"); if (MIPS_JALR_HINT_P (ep) || mips_opts.insn32 || (history[0].insn_mo->pinfo2 & INSN2_BRANCH_DELAY_32BIT)) macro_build (NULL, jalr, "t,s", RA, PIC_CALL_REG); else macro_build (NULL, jalr, "mj", PIC_CALL_REG); } else macro_build (NULL, "jalr", "d,s", RA, PIC_CALL_REG); if (MIPS_JALR_HINT_P (ep)) fix_new_exp (frag_now, f - frag_now->fr_literal, 4, ep, FALSE, jalr_reloc); } /* * Generate a "lui" instruction. */ static void macro_build_lui (expressionS *ep, int regnum) { gas_assert (! mips_opts.mips16); if (ep->X_op != O_constant) { gas_assert (ep->X_op == O_symbol); /* _gp_disp is a special case, used from s_cpload. __gnu_local_gp is used if mips_no_shared. */ gas_assert (mips_pic == NO_PIC || (! HAVE_NEWABI && strcmp (S_GET_NAME (ep->X_add_symbol), "_gp_disp") == 0) || (! mips_in_shared && strcmp (S_GET_NAME (ep->X_add_symbol), "__gnu_local_gp") == 0)); } macro_build (ep, "lui", LUI_FMT, regnum, BFD_RELOC_HI16_S); } /* Generate a sequence of instructions to do a load or store from a constant offset off of a base register (breg) into/from a target register (treg), using AT if necessary. */ static void macro_build_ldst_constoffset (expressionS *ep, const char *op, int treg, int breg, int dbl) { gas_assert (ep->X_op == O_constant); /* Sign-extending 32-bit constants makes their handling easier. */ if (!dbl) normalize_constant_expr (ep); /* Right now, this routine can only handle signed 32-bit constants. */ if (! IS_SEXT_32BIT_NUM(ep->X_add_number + 0x8000)) as_warn (_("operand overflow")); if (IS_SEXT_16BIT_NUM(ep->X_add_number)) { /* Signed 16-bit offset will fit in the op. Easy! */ macro_build (ep, op, "t,o(b)", treg, BFD_RELOC_LO16, breg); } else { /* 32-bit offset, need multiple instructions and AT, like: lui $tempreg,const_hi (BFD_RELOC_HI16_S) addu $tempreg,$tempreg,$breg <op> $treg,const_lo($tempreg) (BFD_RELOC_LO16) to handle the complete offset. */ macro_build_lui (ep, AT); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, AT, breg); macro_build (ep, op, "t,o(b)", treg, BFD_RELOC_LO16, AT); if (!mips_opts.at) as_bad (_("macro used $at after \".set noat\"")); } } /* set_at() * Generates code to set the $at register to true (one) * if reg is less than the immediate expression. */ static void set_at (int reg, int unsignedp) { if (imm_expr.X_add_number >= -0x8000 && imm_expr.X_add_number < 0x8000) macro_build (&imm_expr, unsignedp ? "sltiu" : "slti", "t,r,j", AT, reg, BFD_RELOC_LO16); else { load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, unsignedp ? "sltu" : "slt", "d,v,t", AT, reg, AT); } } /* Count the leading zeroes by performing a binary chop. This is a bulky bit of source, but performance is a LOT better for the majority of values than a simple loop to count the bits: for (lcnt = 0; (lcnt < 32); lcnt++) if ((v) & (1 << (31 - lcnt))) break; However it is not code size friendly, and the gain will drop a bit on certain cached systems. */ #define COUNT_TOP_ZEROES(v) \ (((v) & ~0xffff) == 0 \ ? ((v) & ~0xff) == 0 \ ? ((v) & ~0xf) == 0 \ ? ((v) & ~0x3) == 0 \ ? ((v) & ~0x1) == 0 \ ? !(v) \ ? 32 \ : 31 \ : 30 \ : ((v) & ~0x7) == 0 \ ? 29 \ : 28 \ : ((v) & ~0x3f) == 0 \ ? ((v) & ~0x1f) == 0 \ ? 27 \ : 26 \ : ((v) & ~0x7f) == 0 \ ? 25 \ : 24 \ : ((v) & ~0xfff) == 0 \ ? ((v) & ~0x3ff) == 0 \ ? ((v) & ~0x1ff) == 0 \ ? 23 \ : 22 \ : ((v) & ~0x7ff) == 0 \ ? 21 \ : 20 \ : ((v) & ~0x3fff) == 0 \ ? ((v) & ~0x1fff) == 0 \ ? 19 \ : 18 \ : ((v) & ~0x7fff) == 0 \ ? 17 \ : 16 \ : ((v) & ~0xffffff) == 0 \ ? ((v) & ~0xfffff) == 0 \ ? ((v) & ~0x3ffff) == 0 \ ? ((v) & ~0x1ffff) == 0 \ ? 15 \ : 14 \ : ((v) & ~0x7ffff) == 0 \ ? 13 \ : 12 \ : ((v) & ~0x3fffff) == 0 \ ? ((v) & ~0x1fffff) == 0 \ ? 11 \ : 10 \ : ((v) & ~0x7fffff) == 0 \ ? 9 \ : 8 \ : ((v) & ~0xfffffff) == 0 \ ? ((v) & ~0x3ffffff) == 0 \ ? ((v) & ~0x1ffffff) == 0 \ ? 7 \ : 6 \ : ((v) & ~0x7ffffff) == 0 \ ? 5 \ : 4 \ : ((v) & ~0x3fffffff) == 0 \ ? ((v) & ~0x1fffffff) == 0 \ ? 3 \ : 2 \ : ((v) & ~0x7fffffff) == 0 \ ? 1 \ : 0) /* load_register() * This routine generates the least number of instructions necessary to load * an absolute expression value into a register. */ static void load_register (int reg, expressionS *ep, int dbl) { int freg; expressionS hi32, lo32; if (ep->X_op != O_big) { gas_assert (ep->X_op == O_constant); /* Sign-extending 32-bit constants makes their handling easier. */ if (!dbl) normalize_constant_expr (ep); if (IS_SEXT_16BIT_NUM (ep->X_add_number)) { /* We can handle 16 bit signed values with an addiu to $zero. No need to ever use daddiu here, since $zero and the result are always correct in 32 bit mode. */ macro_build (ep, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16); return; } else if (ep->X_add_number >= 0 && ep->X_add_number < 0x10000) { /* We can handle 16 bit unsigned values with an ori to $zero. */ macro_build (ep, "ori", "t,r,i", reg, 0, BFD_RELOC_LO16); return; } else if ((IS_SEXT_32BIT_NUM (ep->X_add_number))) { /* 32 bit values require an lui. */ macro_build (ep, "lui", LUI_FMT, reg, BFD_RELOC_HI16); if ((ep->X_add_number & 0xffff) != 0) macro_build (ep, "ori", "t,r,i", reg, reg, BFD_RELOC_LO16); return; } } /* The value is larger than 32 bits. */ if (!dbl || GPR_SIZE == 32) { char value[32]; sprintf_vma (value, ep->X_add_number); as_bad (_("number (0x%s) larger than 32 bits"), value); macro_build (ep, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16); return; } if (ep->X_op != O_big) { hi32 = *ep; hi32.X_add_number = (valueT) hi32.X_add_number >> 16; hi32.X_add_number = (valueT) hi32.X_add_number >> 16; hi32.X_add_number &= 0xffffffff; lo32 = *ep; lo32.X_add_number &= 0xffffffff; } else { gas_assert (ep->X_add_number > 2); if (ep->X_add_number == 3) generic_bignum[3] = 0; else if (ep->X_add_number > 4) as_bad (_("number larger than 64 bits")); lo32.X_op = O_constant; lo32.X_add_number = generic_bignum[0] + (generic_bignum[1] << 16); hi32.X_op = O_constant; hi32.X_add_number = generic_bignum[2] + (generic_bignum[3] << 16); } if (hi32.X_add_number == 0) freg = 0; else { int shift, bit; unsigned long hi, lo; if (hi32.X_add_number == (offsetT) 0xffffffff) { if ((lo32.X_add_number & 0xffff8000) == 0xffff8000) { macro_build (&lo32, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16); return; } if (lo32.X_add_number & 0x80000000) { macro_build (&lo32, "lui", LUI_FMT, reg, BFD_RELOC_HI16); if (lo32.X_add_number & 0xffff) macro_build (&lo32, "ori", "t,r,i", reg, reg, BFD_RELOC_LO16); return; } } /* Check for 16bit shifted constant. We know that hi32 is non-zero, so start the mask on the first bit of the hi32 value. */ shift = 17; do { unsigned long himask, lomask; if (shift < 32) { himask = 0xffff >> (32 - shift); lomask = (0xffff << shift) & 0xffffffff; } else { himask = 0xffff << (shift - 32); lomask = 0; } if ((hi32.X_add_number & ~(offsetT) himask) == 0 && (lo32.X_add_number & ~(offsetT) lomask) == 0) { expressionS tmp; tmp.X_op = O_constant; if (shift < 32) tmp.X_add_number = ((hi32.X_add_number << (32 - shift)) | (lo32.X_add_number >> shift)); else tmp.X_add_number = hi32.X_add_number >> (shift - 32); macro_build (&tmp, "ori", "t,r,i", reg, 0, BFD_RELOC_LO16); macro_build (NULL, (shift >= 32) ? "dsll32" : "dsll", SHFT_FMT, reg, reg, (shift >= 32) ? shift - 32 : shift); return; } ++shift; } while (shift <= (64 - 16)); /* Find the bit number of the lowest one bit, and store the shifted value in hi/lo. */ hi = (unsigned long) (hi32.X_add_number & 0xffffffff); lo = (unsigned long) (lo32.X_add_number & 0xffffffff); if (lo != 0) { bit = 0; while ((lo & 1) == 0) { lo >>= 1; ++bit; } lo |= (hi & (((unsigned long) 1 << bit) - 1)) << (32 - bit); hi >>= bit; } else { bit = 32; while ((hi & 1) == 0) { hi >>= 1; ++bit; } lo = hi; hi = 0; } /* Optimize if the shifted value is a (power of 2) - 1. */ if ((hi == 0 && ((lo + 1) & lo) == 0) || (lo == 0xffffffff && ((hi + 1) & hi) == 0)) { shift = COUNT_TOP_ZEROES ((unsigned int) hi32.X_add_number); if (shift != 0) { expressionS tmp; /* This instruction will set the register to be all ones. */ tmp.X_op = O_constant; tmp.X_add_number = (offsetT) -1; macro_build (&tmp, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16); if (bit != 0) { bit += shift; macro_build (NULL, (bit >= 32) ? "dsll32" : "dsll", SHFT_FMT, reg, reg, (bit >= 32) ? bit - 32 : bit); } macro_build (NULL, (shift >= 32) ? "dsrl32" : "dsrl", SHFT_FMT, reg, reg, (shift >= 32) ? shift - 32 : shift); return; } } /* Sign extend hi32 before calling load_register, because we can generally get better code when we load a sign extended value. */ if ((hi32.X_add_number & 0x80000000) != 0) hi32.X_add_number |= ~(offsetT) 0xffffffff; load_register (reg, &hi32, 0); freg = reg; } if ((lo32.X_add_number & 0xffff0000) == 0) { if (freg != 0) { macro_build (NULL, "dsll32", SHFT_FMT, reg, freg, 0); freg = reg; } } else { expressionS mid16; if ((freg == 0) && (lo32.X_add_number == (offsetT) 0xffffffff)) { macro_build (&lo32, "lui", LUI_FMT, reg, BFD_RELOC_HI16); macro_build (NULL, "dsrl32", SHFT_FMT, reg, reg, 0); return; } if (freg != 0) { macro_build (NULL, "dsll", SHFT_FMT, reg, freg, 16); freg = reg; } mid16 = lo32; mid16.X_add_number >>= 16; macro_build (&mid16, "ori", "t,r,i", reg, freg, BFD_RELOC_LO16); macro_build (NULL, "dsll", SHFT_FMT, reg, reg, 16); freg = reg; } if ((lo32.X_add_number & 0xffff) != 0) macro_build (&lo32, "ori", "t,r,i", reg, freg, BFD_RELOC_LO16); } static inline void load_delay_nop (void) { if (!gpr_interlocks) macro_build (NULL, "nop", ""); } /* Load an address into a register. */ static void load_address (int reg, expressionS *ep, int *used_at) { if (ep->X_op != O_constant && ep->X_op != O_symbol) { as_bad (_("expression too complex")); ep->X_op = O_constant; } if (ep->X_op == O_constant) { load_register (reg, ep, HAVE_64BIT_ADDRESSES); return; } if (mips_pic == NO_PIC) { /* If this is a reference to a GP relative symbol, we want addiu $reg,$gp,<sym> (BFD_RELOC_GPREL16) Otherwise we want lui $reg,<sym> (BFD_RELOC_HI16_S) addiu $reg,$reg,<sym> (BFD_RELOC_LO16) If we have an addend, we always use the latter form. With 64bit address space and a usable $at we want lui $reg,<sym> (BFD_RELOC_MIPS_HIGHEST) lui $at,<sym> (BFD_RELOC_HI16_S) daddiu $reg,<sym> (BFD_RELOC_MIPS_HIGHER) daddiu $at,<sym> (BFD_RELOC_LO16) dsll32 $reg,0 daddu $reg,$reg,$at If $at is already in use, we use a path which is suboptimal on superscalar processors. lui $reg,<sym> (BFD_RELOC_MIPS_HIGHEST) daddiu $reg,<sym> (BFD_RELOC_MIPS_HIGHER) dsll $reg,16 daddiu $reg,<sym> (BFD_RELOC_HI16_S) dsll $reg,16 daddiu $reg,<sym> (BFD_RELOC_LO16) For GP relative symbols in 64bit address space we can use the same sequence as in 32bit address space. */ if (HAVE_64BIT_SYMBOLS) { if ((valueT) ep->X_add_number <= MAX_GPREL_OFFSET && !nopic_need_relax (ep->X_add_symbol, 1)) { relax_start (ep->X_add_symbol); macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, mips_gp_register, BFD_RELOC_GPREL16); relax_switch (); } if (*used_at == 0 && mips_opts.at) { macro_build (ep, "lui", LUI_FMT, reg, BFD_RELOC_MIPS_HIGHEST); macro_build (ep, "lui", LUI_FMT, AT, BFD_RELOC_HI16_S); macro_build (ep, "daddiu", "t,r,j", reg, reg, BFD_RELOC_MIPS_HIGHER); macro_build (ep, "daddiu", "t,r,j", AT, AT, BFD_RELOC_LO16); macro_build (NULL, "dsll32", SHFT_FMT, reg, reg, 0); macro_build (NULL, "daddu", "d,v,t", reg, reg, AT); *used_at = 1; } else { macro_build (ep, "lui", LUI_FMT, reg, BFD_RELOC_MIPS_HIGHEST); macro_build (ep, "daddiu", "t,r,j", reg, reg, BFD_RELOC_MIPS_HIGHER); macro_build (NULL, "dsll", SHFT_FMT, reg, reg, 16); macro_build (ep, "daddiu", "t,r,j", reg, reg, BFD_RELOC_HI16_S); macro_build (NULL, "dsll", SHFT_FMT, reg, reg, 16); macro_build (ep, "daddiu", "t,r,j", reg, reg, BFD_RELOC_LO16); } if (mips_relax.sequence) relax_end (); } else { if ((valueT) ep->X_add_number <= MAX_GPREL_OFFSET && !nopic_need_relax (ep->X_add_symbol, 1)) { relax_start (ep->X_add_symbol); macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, mips_gp_register, BFD_RELOC_GPREL16); relax_switch (); } macro_build_lui (ep, reg); macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, reg, BFD_RELOC_LO16); if (mips_relax.sequence) relax_end (); } } else if (!mips_big_got) { expressionS ex; /* If this is a reference to an external symbol, we want lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) Otherwise we want lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $reg,$reg,<sym> (BFD_RELOC_LO16) If there is a constant, it must be added in after. If we have NewABI, we want lw $reg,<sym+cst>($gp) (BFD_RELOC_MIPS_GOT_DISP) unless we're referencing a global symbol with a non-zero offset, in which case cst must be added separately. */ if (HAVE_NEWABI) { if (ep->X_add_number) { ex.X_add_number = ep->X_add_number; ep->X_add_number = 0; relax_start (ep->X_add_symbol); macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg, BFD_RELOC_MIPS_GOT_DISP, mips_gp_register); if (ex.X_add_number < -0x8000 || ex.X_add_number >= 0x8000) as_bad (_("PIC code offset overflow (max 16 signed bits)")); ex.X_op = O_constant; macro_build (&ex, ADDRESS_ADDI_INSN, "t,r,j", reg, reg, BFD_RELOC_LO16); ep->X_add_number = ex.X_add_number; relax_switch (); } macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg, BFD_RELOC_MIPS_GOT_DISP, mips_gp_register); if (mips_relax.sequence) relax_end (); } else { ex.X_add_number = ep->X_add_number; ep->X_add_number = 0; macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg, BFD_RELOC_MIPS_GOT16, mips_gp_register); load_delay_nop (); relax_start (ep->X_add_symbol); relax_switch (); macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, reg, BFD_RELOC_LO16); relax_end (); if (ex.X_add_number != 0) { if (ex.X_add_number < -0x8000 || ex.X_add_number >= 0x8000) as_bad (_("PIC code offset overflow (max 16 signed bits)")); ex.X_op = O_constant; macro_build (&ex, ADDRESS_ADDI_INSN, "t,r,j", reg, reg, BFD_RELOC_LO16); } } } else if (mips_big_got) { expressionS ex; /* This is the large GOT case. If this is a reference to an external symbol, we want lui $reg,<sym> (BFD_RELOC_MIPS_GOT_HI16) addu $reg,$reg,$gp lw $reg,<sym>($reg) (BFD_RELOC_MIPS_GOT_LO16) Otherwise, for a reference to a local symbol in old ABI, we want lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $reg,$reg,<sym> (BFD_RELOC_LO16) If there is a constant, it must be added in after. In the NewABI, for local symbols, with or without offsets, we want: lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT_PAGE) addiu $reg,$reg,<sym> (BFD_RELOC_MIPS_GOT_OFST) */ if (HAVE_NEWABI) { ex.X_add_number = ep->X_add_number; ep->X_add_number = 0; relax_start (ep->X_add_symbol); macro_build (ep, "lui", LUI_FMT, reg, BFD_RELOC_MIPS_GOT_HI16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", reg, reg, mips_gp_register); macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg, BFD_RELOC_MIPS_GOT_LO16, reg); if (ex.X_add_number < -0x8000 || ex.X_add_number >= 0x8000) as_bad (_("PIC code offset overflow (max 16 signed bits)")); else if (ex.X_add_number) { ex.X_op = O_constant; macro_build (&ex, ADDRESS_ADDI_INSN, "t,r,j", reg, reg, BFD_RELOC_LO16); } ep->X_add_number = ex.X_add_number; relax_switch (); macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg, BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register); macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, reg, BFD_RELOC_MIPS_GOT_OFST); relax_end (); } else { ex.X_add_number = ep->X_add_number; ep->X_add_number = 0; relax_start (ep->X_add_symbol); macro_build (ep, "lui", LUI_FMT, reg, BFD_RELOC_MIPS_GOT_HI16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", reg, reg, mips_gp_register); macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg, BFD_RELOC_MIPS_GOT_LO16, reg); relax_switch (); if (reg_needs_delay (mips_gp_register)) { /* We need a nop before loading from $gp. This special check is required because the lui which starts the main instruction stream does not refer to $gp, and so will not insert the nop which may be required. */ macro_build (NULL, "nop", ""); } macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg, BFD_RELOC_MIPS_GOT16, mips_gp_register); load_delay_nop (); macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, reg, BFD_RELOC_LO16); relax_end (); if (ex.X_add_number != 0) { if (ex.X_add_number < -0x8000 || ex.X_add_number >= 0x8000) as_bad (_("PIC code offset overflow (max 16 signed bits)")); ex.X_op = O_constant; macro_build (&ex, ADDRESS_ADDI_INSN, "t,r,j", reg, reg, BFD_RELOC_LO16); } } } else abort (); if (!mips_opts.at && *used_at == 1) as_bad (_("macro used $at after \".set noat\"")); } /* Move the contents of register SOURCE into register DEST. */ static void move_register (int dest, int source) { /* Prefer to use a 16-bit microMIPS instruction unless the previous instruction specifically requires a 32-bit one. */ if (mips_opts.micromips && !mips_opts.insn32 && !(history[0].insn_mo->pinfo2 & INSN2_BRANCH_DELAY_32BIT)) macro_build (NULL, "move", "mp,mj", dest, source); else macro_build (NULL, "or", "d,v,t", dest, source, 0); } /* Emit an SVR4 PIC sequence to load address LOCAL into DEST, where LOCAL is the sum of a symbol and a 16-bit or 32-bit displacement. The two alternatives are: Global symbol Local sybmol ------------- ------------ lw DEST,%got(SYMBOL) lw DEST,%got(SYMBOL + OFFSET) ... ... addiu DEST,DEST,OFFSET addiu DEST,DEST,%lo(SYMBOL + OFFSET) load_got_offset emits the first instruction and add_got_offset emits the second for a 16-bit offset or add_got_offset_hilo emits a sequence to add a 32-bit offset using a scratch register. */ static void load_got_offset (int dest, expressionS *local) { expressionS global; global = *local; global.X_add_number = 0; relax_start (local->X_add_symbol); macro_build (&global, ADDRESS_LOAD_INSN, "t,o(b)", dest, BFD_RELOC_MIPS_GOT16, mips_gp_register); relax_switch (); macro_build (local, ADDRESS_LOAD_INSN, "t,o(b)", dest, BFD_RELOC_MIPS_GOT16, mips_gp_register); relax_end (); } static void add_got_offset (int dest, expressionS *local) { expressionS global; global.X_op = O_constant; global.X_op_symbol = NULL; global.X_add_symbol = NULL; global.X_add_number = local->X_add_number; relax_start (local->X_add_symbol); macro_build (&global, ADDRESS_ADDI_INSN, "t,r,j", dest, dest, BFD_RELOC_LO16); relax_switch (); macro_build (local, ADDRESS_ADDI_INSN, "t,r,j", dest, dest, BFD_RELOC_LO16); relax_end (); } static void add_got_offset_hilo (int dest, expressionS *local, int tmp) { expressionS global; int hold_mips_optimize; global.X_op = O_constant; global.X_op_symbol = NULL; global.X_add_symbol = NULL; global.X_add_number = local->X_add_number; relax_start (local->X_add_symbol); load_register (tmp, &global, HAVE_64BIT_ADDRESSES); relax_switch (); /* Set mips_optimize around the lui instruction to avoid inserting an unnecessary nop after the lw. */ hold_mips_optimize = mips_optimize; mips_optimize = 2; macro_build_lui (&global, tmp); mips_optimize = hold_mips_optimize; macro_build (local, ADDRESS_ADDI_INSN, "t,r,j", tmp, tmp, BFD_RELOC_LO16); relax_end (); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", dest, dest, tmp); } /* Emit a sequence of instructions to emulate a branch likely operation. BR is an ordinary branch corresponding to one to be emulated. BRNEG is its complementing branch with the original condition negated. CALL is set if the original branch specified the link operation. EP, FMT, SREG and TREG specify the usual macro_build() parameters. Code like this is produced in the noreorder mode: BRNEG <args>, 1f nop b <sym> delay slot (executed only if branch taken) 1: or, if CALL is set: BRNEG <args>, 1f nop bal <sym> delay slot (executed only if branch taken) 1: In the reorder mode the delay slot would be filled with a nop anyway, so code produced is simply: BR <args>, <sym> nop This function is used when producing code for the microMIPS ASE that does not implement branch likely instructions in hardware. */ static void macro_build_branch_likely (const char *br, const char *brneg, int call, expressionS *ep, const char *fmt, unsigned int sreg, unsigned int treg) { int noreorder = mips_opts.noreorder; expressionS expr1; gas_assert (mips_opts.micromips); start_noreorder (); if (noreorder) { micromips_label_expr (&expr1); macro_build (&expr1, brneg, fmt, sreg, treg); macro_build (NULL, "nop", ""); macro_build (ep, call ? "bal" : "b", "p"); /* Set to true so that append_insn adds a label. */ emit_branch_likely_macro = TRUE; } else { macro_build (ep, br, fmt, sreg, treg); macro_build (NULL, "nop", ""); } end_noreorder (); } /* Emit a coprocessor branch-likely macro specified by TYPE, using CC as the condition code tested. EP specifies the branch target. */ static void macro_build_branch_ccl (int type, expressionS *ep, unsigned int cc) { const int call = 0; const char *brneg; const char *br; switch (type) { case M_BC1FL: br = "bc1f"; brneg = "bc1t"; break; case M_BC1TL: br = "bc1t"; brneg = "bc1f"; break; case M_BC2FL: br = "bc2f"; brneg = "bc2t"; break; case M_BC2TL: br = "bc2t"; brneg = "bc2f"; break; default: abort (); } macro_build_branch_likely (br, brneg, call, ep, "N,p", cc, ZERO); } /* Emit a two-argument branch macro specified by TYPE, using SREG as the register tested. EP specifies the branch target. */ static void macro_build_branch_rs (int type, expressionS *ep, unsigned int sreg) { const char *brneg = NULL; const char *br; int call = 0; switch (type) { case M_BGEZ: br = "bgez"; break; case M_BGEZL: br = mips_opts.micromips ? "bgez" : "bgezl"; brneg = "bltz"; break; case M_BGEZALL: gas_assert (mips_opts.micromips); br = mips_opts.insn32 ? "bgezal" : "bgezals"; brneg = "bltz"; call = 1; break; case M_BGTZ: br = "bgtz"; break; case M_BGTZL: br = mips_opts.micromips ? "bgtz" : "bgtzl"; brneg = "blez"; break; case M_BLEZ: br = "blez"; break; case M_BLEZL: br = mips_opts.micromips ? "blez" : "blezl"; brneg = "bgtz"; break; case M_BLTZ: br = "bltz"; break; case M_BLTZL: br = mips_opts.micromips ? "bltz" : "bltzl"; brneg = "bgez"; break; case M_BLTZALL: gas_assert (mips_opts.micromips); br = mips_opts.insn32 ? "bltzal" : "bltzals"; brneg = "bgez"; call = 1; break; default: abort (); } if (mips_opts.micromips && brneg) macro_build_branch_likely (br, brneg, call, ep, "s,p", sreg, ZERO); else macro_build (ep, br, "s,p", sreg); } /* Emit a three-argument branch macro specified by TYPE, using SREG and TREG as the registers tested. EP specifies the branch target. */ static void macro_build_branch_rsrt (int type, expressionS *ep, unsigned int sreg, unsigned int treg) { const char *brneg = NULL; const int call = 0; const char *br; switch (type) { case M_BEQ: case M_BEQ_I: br = "beq"; break; case M_BEQL: case M_BEQL_I: br = mips_opts.micromips ? "beq" : "beql"; brneg = "bne"; break; case M_BNE: case M_BNE_I: br = "bne"; break; case M_BNEL: case M_BNEL_I: br = mips_opts.micromips ? "bne" : "bnel"; brneg = "beq"; break; default: abort (); } if (mips_opts.micromips && brneg) macro_build_branch_likely (br, brneg, call, ep, "s,t,p", sreg, treg); else macro_build (ep, br, "s,t,p", sreg, treg); } /* Return the high part that should be loaded in order to make the low part of VALUE accessible using an offset of OFFBITS bits. */ static offsetT offset_high_part (offsetT value, unsigned int offbits) { offsetT bias; addressT low_mask; if (offbits == 0) return value; bias = 1 << (offbits - 1); low_mask = bias * 2 - 1; return (value + bias) & ~low_mask; } /* Return true if the value stored in offset_expr and offset_reloc fits into a signed offset of OFFBITS bits. RANGE is the maximum amount that the caller wants to add without inducing overflow and ALIGN is the known alignment of the value in bytes. */ static bfd_boolean small_offset_p (unsigned int range, unsigned int align, unsigned int offbits) { if (offbits == 16) { /* Accept any relocation operator if overflow isn't a concern. */ if (range < align && *offset_reloc != BFD_RELOC_UNUSED) return TRUE; /* These relocations are guaranteed not to overflow in correct links. */ if (*offset_reloc == BFD_RELOC_MIPS_LITERAL || gprel16_reloc_p (*offset_reloc)) return TRUE; } if (offset_expr.X_op == O_constant && offset_high_part (offset_expr.X_add_number, offbits) == 0 && offset_high_part (offset_expr.X_add_number + range, offbits) == 0) return TRUE; return FALSE; } /* * Build macros * This routine implements the seemingly endless macro or synthesized * instructions and addressing modes in the mips assembly language. Many * of these macros are simple and are similar to each other. These could * probably be handled by some kind of table or grammar approach instead of * this verbose method. Others are not simple macros but are more like * optimizing code generation. * One interesting optimization is when several store macros appear * consecutively that would load AT with the upper half of the same address. * The ensuing load upper instructions are omitted. This implies some kind * of global optimization. We currently only optimize within a single macro. * For many of the load and store macros if the address is specified as a * constant expression in the first 64k of memory (ie ld $2,0x4000c) we * first load register 'at' with zero and use it as the base register. The * mips assembler simply uses register $zero. Just one tiny optimization * we're missing. */ static void macro (struct mips_cl_insn *ip, char *str) { const struct mips_operand_array *operands; unsigned int breg, i; unsigned int tempreg; int mask; int used_at = 0; expressionS label_expr; expressionS expr1; expressionS *ep; const char *s; const char *s2; const char *fmt; int likely = 0; int coproc = 0; int offbits = 16; int call = 0; int jals = 0; int dbl = 0; int imm = 0; int ust = 0; int lp = 0; bfd_boolean large_offset; int off; int hold_mips_optimize; unsigned int align; unsigned int op[MAX_OPERANDS]; gas_assert (! mips_opts.mips16); operands = insn_operands (ip); for (i = 0; i < MAX_OPERANDS; i++) if (operands->operand[i]) op[i] = insn_extract_operand (ip, operands->operand[i]); else op[i] = -1; mask = ip->insn_mo->mask; label_expr.X_op = O_constant; label_expr.X_op_symbol = NULL; label_expr.X_add_symbol = NULL; label_expr.X_add_number = 0; expr1.X_op = O_constant; expr1.X_op_symbol = NULL; expr1.X_add_symbol = NULL; expr1.X_add_number = 1; align = 1; switch (mask) { case M_DABS: dbl = 1; /* Fall through. */ case M_ABS: /* bgez $a0,1f move v0,$a0 sub v0,$zero,$a0 1: */ start_noreorder (); if (mips_opts.micromips) micromips_label_expr (&label_expr); else label_expr.X_add_number = 8; macro_build (&label_expr, "bgez", "s,p", op[1]); if (op[0] == op[1]) macro_build (NULL, "nop", ""); else move_register (op[0], op[1]); macro_build (NULL, dbl ? "dsub" : "sub", "d,v,t", op[0], 0, op[1]); if (mips_opts.micromips) micromips_add_label (); end_noreorder (); break; case M_ADD_I: s = "addi"; s2 = "add"; goto do_addi; case M_ADDU_I: s = "addiu"; s2 = "addu"; goto do_addi; case M_DADD_I: dbl = 1; s = "daddi"; s2 = "dadd"; if (!mips_opts.micromips) goto do_addi; if (imm_expr.X_add_number >= -0x200 && imm_expr.X_add_number < 0x200) { macro_build (NULL, s, "t,r,.", op[0], op[1], (int) imm_expr.X_add_number); break; } goto do_addi_i; case M_DADDU_I: dbl = 1; s = "daddiu"; s2 = "daddu"; do_addi: if (imm_expr.X_add_number >= -0x8000 && imm_expr.X_add_number < 0x8000) { macro_build (&imm_expr, s, "t,r,j", op[0], op[1], BFD_RELOC_LO16); break; } do_addi_i: used_at = 1; load_register (AT, &imm_expr, dbl); macro_build (NULL, s2, "d,v,t", op[0], op[1], AT); break; case M_AND_I: s = "andi"; s2 = "and"; goto do_bit; case M_OR_I: s = "ori"; s2 = "or"; goto do_bit; case M_NOR_I: s = ""; s2 = "nor"; goto do_bit; case M_XOR_I: s = "xori"; s2 = "xor"; do_bit: if (imm_expr.X_add_number >= 0 && imm_expr.X_add_number < 0x10000) { if (mask != M_NOR_I) macro_build (&imm_expr, s, "t,r,i", op[0], op[1], BFD_RELOC_LO16); else { macro_build (&imm_expr, "ori", "t,r,i", op[0], op[1], BFD_RELOC_LO16); macro_build (NULL, "nor", "d,v,t", op[0], op[0], 0); } break; } used_at = 1; load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, s2, "d,v,t", op[0], op[1], AT); break; case M_BALIGN: switch (imm_expr.X_add_number) { case 0: macro_build (NULL, "nop", ""); break; case 2: macro_build (NULL, "packrl.ph", "d,s,t", op[0], op[0], op[1]); break; case 1: case 3: macro_build (NULL, "balign", "t,s,2", op[0], op[1], (int) imm_expr.X_add_number); break; default: as_bad (_("BALIGN immediate not 0, 1, 2 or 3 (%lu)"), (unsigned long) imm_expr.X_add_number); break; } break; case M_BC1FL: case M_BC1TL: case M_BC2FL: case M_BC2TL: gas_assert (mips_opts.micromips); macro_build_branch_ccl (mask, &offset_expr, EXTRACT_OPERAND (1, BCC, *ip)); break; case M_BEQ_I: case M_BEQL_I: case M_BNE_I: case M_BNEL_I: if (imm_expr.X_add_number == 0) op[1] = 0; else { op[1] = AT; used_at = 1; load_register (op[1], &imm_expr, GPR_SIZE == 64); } /* Fall through. */ case M_BEQL: case M_BNEL: macro_build_branch_rsrt (mask, &offset_expr, op[0], op[1]); break; case M_BGEL: likely = 1; /* Fall through. */ case M_BGE: if (op[1] == 0) macro_build_branch_rs (likely ? M_BGEZL : M_BGEZ, &offset_expr, op[0]); else if (op[0] == 0) macro_build_branch_rs (likely ? M_BLEZL : M_BLEZ, &offset_expr, op[1]); else { used_at = 1; macro_build (NULL, "slt", "d,v,t", AT, op[0], op[1]); macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, AT, ZERO); } break; case M_BGEZL: case M_BGEZALL: case M_BGTZL: case M_BLEZL: case M_BLTZL: case M_BLTZALL: macro_build_branch_rs (mask, &offset_expr, op[0]); break; case M_BGTL_I: likely = 1; /* Fall through. */ case M_BGT_I: /* Check for > max integer. */ if (imm_expr.X_add_number >= GPR_SMAX) { do_false: /* Result is always false. */ if (! likely) macro_build (NULL, "nop", ""); else macro_build_branch_rsrt (M_BNEL, &offset_expr, ZERO, ZERO); break; } ++imm_expr.X_add_number; /* FALLTHROUGH */ case M_BGE_I: case M_BGEL_I: if (mask == M_BGEL_I) likely = 1; if (imm_expr.X_add_number == 0) { macro_build_branch_rs (likely ? M_BGEZL : M_BGEZ, &offset_expr, op[0]); break; } if (imm_expr.X_add_number == 1) { macro_build_branch_rs (likely ? M_BGTZL : M_BGTZ, &offset_expr, op[0]); break; } if (imm_expr.X_add_number <= GPR_SMIN) { do_true: /* result is always true */ as_warn (_("branch %s is always true"), ip->insn_mo->name); macro_build (&offset_expr, "b", "p"); break; } used_at = 1; set_at (op[0], 0); macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, AT, ZERO); break; case M_BGEUL: likely = 1; /* Fall through. */ case M_BGEU: if (op[1] == 0) goto do_true; else if (op[0] == 0) macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, ZERO, op[1]); else { used_at = 1; macro_build (NULL, "sltu", "d,v,t", AT, op[0], op[1]); macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, AT, ZERO); } break; case M_BGTUL_I: likely = 1; /* Fall through. */ case M_BGTU_I: if (op[0] == 0 || (GPR_SIZE == 32 && imm_expr.X_add_number == -1)) goto do_false; ++imm_expr.X_add_number; /* FALLTHROUGH */ case M_BGEU_I: case M_BGEUL_I: if (mask == M_BGEUL_I) likely = 1; if (imm_expr.X_add_number == 0) goto do_true; else if (imm_expr.X_add_number == 1) macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, op[0], ZERO); else { used_at = 1; set_at (op[0], 1); macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, AT, ZERO); } break; case M_BGTL: likely = 1; /* Fall through. */ case M_BGT: if (op[1] == 0) macro_build_branch_rs (likely ? M_BGTZL : M_BGTZ, &offset_expr, op[0]); else if (op[0] == 0) macro_build_branch_rs (likely ? M_BLTZL : M_BLTZ, &offset_expr, op[1]); else { used_at = 1; macro_build (NULL, "slt", "d,v,t", AT, op[1], op[0]); macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, AT, ZERO); } break; case M_BGTUL: likely = 1; /* Fall through. */ case M_BGTU: if (op[1] == 0) macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, op[0], ZERO); else if (op[0] == 0) goto do_false; else { used_at = 1; macro_build (NULL, "sltu", "d,v,t", AT, op[1], op[0]); macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, AT, ZERO); } break; case M_BLEL: likely = 1; /* Fall through. */ case M_BLE: if (op[1] == 0) macro_build_branch_rs (likely ? M_BLEZL : M_BLEZ, &offset_expr, op[0]); else if (op[0] == 0) macro_build_branch_rs (likely ? M_BGEZL : M_BGEZ, &offset_expr, op[1]); else { used_at = 1; macro_build (NULL, "slt", "d,v,t", AT, op[1], op[0]); macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, AT, ZERO); } break; case M_BLEL_I: likely = 1; /* Fall through. */ case M_BLE_I: if (imm_expr.X_add_number >= GPR_SMAX) goto do_true; ++imm_expr.X_add_number; /* FALLTHROUGH */ case M_BLT_I: case M_BLTL_I: if (mask == M_BLTL_I) likely = 1; if (imm_expr.X_add_number == 0) macro_build_branch_rs (likely ? M_BLTZL : M_BLTZ, &offset_expr, op[0]); else if (imm_expr.X_add_number == 1) macro_build_branch_rs (likely ? M_BLEZL : M_BLEZ, &offset_expr, op[0]); else { used_at = 1; set_at (op[0], 0); macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, AT, ZERO); } break; case M_BLEUL: likely = 1; /* Fall through. */ case M_BLEU: if (op[1] == 0) macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, op[0], ZERO); else if (op[0] == 0) goto do_true; else { used_at = 1; macro_build (NULL, "sltu", "d,v,t", AT, op[1], op[0]); macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, AT, ZERO); } break; case M_BLEUL_I: likely = 1; /* Fall through. */ case M_BLEU_I: if (op[0] == 0 || (GPR_SIZE == 32 && imm_expr.X_add_number == -1)) goto do_true; ++imm_expr.X_add_number; /* FALLTHROUGH */ case M_BLTU_I: case M_BLTUL_I: if (mask == M_BLTUL_I) likely = 1; if (imm_expr.X_add_number == 0) goto do_false; else if (imm_expr.X_add_number == 1) macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ, &offset_expr, op[0], ZERO); else { used_at = 1; set_at (op[0], 1); macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, AT, ZERO); } break; case M_BLTL: likely = 1; /* Fall through. */ case M_BLT: if (op[1] == 0) macro_build_branch_rs (likely ? M_BLTZL : M_BLTZ, &offset_expr, op[0]); else if (op[0] == 0) macro_build_branch_rs (likely ? M_BGTZL : M_BGTZ, &offset_expr, op[1]); else { used_at = 1; macro_build (NULL, "slt", "d,v,t", AT, op[0], op[1]); macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, AT, ZERO); } break; case M_BLTUL: likely = 1; /* Fall through. */ case M_BLTU: if (op[1] == 0) goto do_false; else if (op[0] == 0) macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, ZERO, op[1]); else { used_at = 1; macro_build (NULL, "sltu", "d,v,t", AT, op[0], op[1]); macro_build_branch_rsrt (likely ? M_BNEL : M_BNE, &offset_expr, AT, ZERO); } break; case M_DDIV_3: dbl = 1; /* Fall through. */ case M_DIV_3: s = "mflo"; goto do_div3; case M_DREM_3: dbl = 1; /* Fall through. */ case M_REM_3: s = "mfhi"; do_div3: if (op[2] == 0) { as_warn (_("divide by zero")); if (mips_trap) macro_build (NULL, "teq", TRAP_FMT, ZERO, ZERO, 7); else macro_build (NULL, "break", BRK_FMT, 7); break; } start_noreorder (); if (mips_trap) { macro_build (NULL, "teq", TRAP_FMT, op[2], ZERO, 7); macro_build (NULL, dbl ? "ddiv" : "div", "z,s,t", op[1], op[2]); } else { if (mips_opts.micromips) micromips_label_expr (&label_expr); else label_expr.X_add_number = 8; macro_build (&label_expr, "bne", "s,t,p", op[2], ZERO); macro_build (NULL, dbl ? "ddiv" : "div", "z,s,t", op[1], op[2]); macro_build (NULL, "break", BRK_FMT, 7); if (mips_opts.micromips) micromips_add_label (); } expr1.X_add_number = -1; used_at = 1; load_register (AT, &expr1, dbl); if (mips_opts.micromips) micromips_label_expr (&label_expr); else label_expr.X_add_number = mips_trap ? (dbl ? 12 : 8) : (dbl ? 20 : 16); macro_build (&label_expr, "bne", "s,t,p", op[2], AT); if (dbl) { expr1.X_add_number = 1; load_register (AT, &expr1, dbl); macro_build (NULL, "dsll32", SHFT_FMT, AT, AT, 31); } else { expr1.X_add_number = 0x80000000; macro_build (&expr1, "lui", LUI_FMT, AT, BFD_RELOC_HI16); } if (mips_trap) { macro_build (NULL, "teq", TRAP_FMT, op[1], AT, 6); /* We want to close the noreorder block as soon as possible, so that later insns are available for delay slot filling. */ end_noreorder (); } else { if (mips_opts.micromips) micromips_label_expr (&label_expr); else label_expr.X_add_number = 8; macro_build (&label_expr, "bne", "s,t,p", op[1], AT); macro_build (NULL, "nop", ""); /* We want to close the noreorder block as soon as possible, so that later insns are available for delay slot filling. */ end_noreorder (); macro_build (NULL, "break", BRK_FMT, 6); } if (mips_opts.micromips) micromips_add_label (); macro_build (NULL, s, MFHL_FMT, op[0]); break; case M_DIV_3I: s = "div"; s2 = "mflo"; goto do_divi; case M_DIVU_3I: s = "divu"; s2 = "mflo"; goto do_divi; case M_REM_3I: s = "div"; s2 = "mfhi"; goto do_divi; case M_REMU_3I: s = "divu"; s2 = "mfhi"; goto do_divi; case M_DDIV_3I: dbl = 1; s = "ddiv"; s2 = "mflo"; goto do_divi; case M_DDIVU_3I: dbl = 1; s = "ddivu"; s2 = "mflo"; goto do_divi; case M_DREM_3I: dbl = 1; s = "ddiv"; s2 = "mfhi"; goto do_divi; case M_DREMU_3I: dbl = 1; s = "ddivu"; s2 = "mfhi"; do_divi: if (imm_expr.X_add_number == 0) { as_warn (_("divide by zero")); if (mips_trap) macro_build (NULL, "teq", TRAP_FMT, ZERO, ZERO, 7); else macro_build (NULL, "break", BRK_FMT, 7); break; } if (imm_expr.X_add_number == 1) { if (strcmp (s2, "mflo") == 0) move_register (op[0], op[1]); else move_register (op[0], ZERO); break; } if (imm_expr.X_add_number == -1 && s[strlen (s) - 1] != 'u') { if (strcmp (s2, "mflo") == 0) macro_build (NULL, dbl ? "dneg" : "neg", "d,w", op[0], op[1]); else move_register (op[0], ZERO); break; } used_at = 1; load_register (AT, &imm_expr, dbl); macro_build (NULL, s, "z,s,t", op[1], AT); macro_build (NULL, s2, MFHL_FMT, op[0]); break; case M_DIVU_3: s = "divu"; s2 = "mflo"; goto do_divu3; case M_REMU_3: s = "divu"; s2 = "mfhi"; goto do_divu3; case M_DDIVU_3: s = "ddivu"; s2 = "mflo"; goto do_divu3; case M_DREMU_3: s = "ddivu"; s2 = "mfhi"; do_divu3: start_noreorder (); if (mips_trap) { macro_build (NULL, "teq", TRAP_FMT, op[2], ZERO, 7); macro_build (NULL, s, "z,s,t", op[1], op[2]); /* We want to close the noreorder block as soon as possible, so that later insns are available for delay slot filling. */ end_noreorder (); } else { if (mips_opts.micromips) micromips_label_expr (&label_expr); else label_expr.X_add_number = 8; macro_build (&label_expr, "bne", "s,t,p", op[2], ZERO); macro_build (NULL, s, "z,s,t", op[1], op[2]); /* We want to close the noreorder block as soon as possible, so that later insns are available for delay slot filling. */ end_noreorder (); macro_build (NULL, "break", BRK_FMT, 7); if (mips_opts.micromips) micromips_add_label (); } macro_build (NULL, s2, MFHL_FMT, op[0]); break; case M_DLCA_AB: dbl = 1; /* Fall through. */ case M_LCA_AB: call = 1; goto do_la; case M_DLA_AB: dbl = 1; /* Fall through. */ case M_LA_AB: do_la: /* Load the address of a symbol into a register. If breg is not zero, we then add a base register to it. */ breg = op[2]; if (dbl && GPR_SIZE == 32) as_warn (_("dla used to load 32-bit register; recommend using la " "instead")); if (!dbl && HAVE_64BIT_OBJECTS) as_warn (_("la used to load 64-bit address; recommend using dla " "instead")); if (small_offset_p (0, align, 16)) { macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", op[0], breg, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2]); break; } if (mips_opts.at && (op[0] == breg)) { tempreg = AT; used_at = 1; } else tempreg = op[0]; if (offset_expr.X_op != O_symbol && offset_expr.X_op != O_constant) { as_bad (_("expression too complex")); offset_expr.X_op = O_constant; } if (offset_expr.X_op == O_constant) load_register (tempreg, &offset_expr, HAVE_64BIT_ADDRESSES); else if (mips_pic == NO_PIC) { /* If this is a reference to a GP relative symbol, we want addiu $tempreg,$gp,<sym> (BFD_RELOC_GPREL16) Otherwise we want lui $tempreg,<sym> (BFD_RELOC_HI16_S) addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16) If we have a constant, we need two instructions anyhow, so we may as well always use the latter form. With 64bit address space and a usable $at we want lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST) lui $at,<sym> (BFD_RELOC_HI16_S) daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER) daddiu $at,<sym> (BFD_RELOC_LO16) dsll32 $tempreg,0 daddu $tempreg,$tempreg,$at If $at is already in use, we use a path which is suboptimal on superscalar processors. lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST) daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER) dsll $tempreg,16 daddiu $tempreg,<sym> (BFD_RELOC_HI16_S) dsll $tempreg,16 daddiu $tempreg,<sym> (BFD_RELOC_LO16) For GP relative symbols in 64bit address space we can use the same sequence as in 32bit address space. */ if (HAVE_64BIT_SYMBOLS) { if ((valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET && !nopic_need_relax (offset_expr.X_add_symbol, 1)) { relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, mips_gp_register, BFD_RELOC_GPREL16); relax_switch (); } if (used_at == 0 && mips_opts.at) { macro_build (&offset_expr, "lui", LUI_FMT, tempreg, BFD_RELOC_MIPS_HIGHEST); macro_build (&offset_expr, "lui", LUI_FMT, AT, BFD_RELOC_HI16_S); macro_build (&offset_expr, "daddiu", "t,r,j", tempreg, tempreg, BFD_RELOC_MIPS_HIGHER); macro_build (&offset_expr, "daddiu", "t,r,j", AT, AT, BFD_RELOC_LO16); macro_build (NULL, "dsll32", SHFT_FMT, tempreg, tempreg, 0); macro_build (NULL, "daddu", "d,v,t", tempreg, tempreg, AT); used_at = 1; } else { macro_build (&offset_expr, "lui", LUI_FMT, tempreg, BFD_RELOC_MIPS_HIGHEST); macro_build (&offset_expr, "daddiu", "t,r,j", tempreg, tempreg, BFD_RELOC_MIPS_HIGHER); macro_build (NULL, "dsll", SHFT_FMT, tempreg, tempreg, 16); macro_build (&offset_expr, "daddiu", "t,r,j", tempreg, tempreg, BFD_RELOC_HI16_S); macro_build (NULL, "dsll", SHFT_FMT, tempreg, tempreg, 16); macro_build (&offset_expr, "daddiu", "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); } if (mips_relax.sequence) relax_end (); } else { if ((valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET && !nopic_need_relax (offset_expr.X_add_symbol, 1)) { relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, mips_gp_register, BFD_RELOC_GPREL16); relax_switch (); } if (!IS_SEXT_32BIT_NUM (offset_expr.X_add_number)) as_bad (_("offset too large")); macro_build_lui (&offset_expr, tempreg); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); if (mips_relax.sequence) relax_end (); } } else if (!mips_big_got && !HAVE_NEWABI) { int lw_reloc_type = (int) BFD_RELOC_MIPS_GOT16; /* If this is a reference to an external symbol, and there is no constant, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) or for lca or if tempreg is PIC_CALL_REG lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_CALL16) For a local symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16) If we have a small constant, and this is a reference to an external symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $tempreg,$tempreg,<constant> For a local symbol, we want the same instruction sequence, but we output a BFD_RELOC_LO16 reloc on the addiu instruction. If we have a large constant, and this is a reference to an external symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) lui $at,<hiconstant> addiu $at,$at,<loconstant> addu $tempreg,$tempreg,$at For a local symbol, we want the same instruction sequence, but we output a BFD_RELOC_LO16 reloc on the addiu instruction. */ if (offset_expr.X_add_number == 0) { if (mips_pic == SVR4_PIC && breg == 0 && (call || tempreg == PIC_CALL_REG)) lw_reloc_type = (int) BFD_RELOC_MIPS_CALL16; relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, lw_reloc_type, mips_gp_register); if (breg != 0) { /* We're going to put in an addu instruction using tempreg, so we may as well insert the nop right now. */ load_delay_nop (); } relax_switch (); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT16, mips_gp_register); load_delay_nop (); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); relax_end (); /* FIXME: If breg == 0, and the next instruction uses $tempreg, then if this variant case is used an extra nop will be generated. */ } else if (offset_expr.X_add_number >= -0x8000 && offset_expr.X_add_number < 0x8000) { load_got_offset (tempreg, &offset_expr); load_delay_nop (); add_got_offset (tempreg, &offset_expr); } else { expr1.X_add_number = offset_expr.X_add_number; offset_expr.X_add_number = SEXT_16BIT (offset_expr.X_add_number); load_got_offset (tempreg, &offset_expr); offset_expr.X_add_number = expr1.X_add_number; /* If we are going to add in a base register, and the target register and the base register are the same, then we are using AT as a temporary register. Since we want to load the constant into AT, we add our current AT (from the global offset table) and the register into the register now, and pretend we were not using a base register. */ if (breg == op[0]) { load_delay_nop (); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", op[0], AT, breg); breg = 0; tempreg = op[0]; } add_got_offset_hilo (tempreg, &offset_expr, AT); used_at = 1; } } else if (!mips_big_got && HAVE_NEWABI) { int add_breg_early = 0; /* If this is a reference to an external, and there is no constant, or local symbol (*), with or without a constant, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_DISP) or for lca or if tempreg is PIC_CALL_REG lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_CALL16) If we have a small constant, and this is a reference to an external symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_DISP) addiu $tempreg,$tempreg,<constant> If we have a large constant, and this is a reference to an external symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_DISP) lui $at,<hiconstant> addiu $at,$at,<loconstant> addu $tempreg,$tempreg,$at (*) Other assemblers seem to prefer GOT_PAGE/GOT_OFST for local symbols, even though it introduces an additional instruction. */ if (offset_expr.X_add_number) { expr1.X_add_number = offset_expr.X_add_number; offset_expr.X_add_number = 0; relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_DISP, mips_gp_register); if (expr1.X_add_number >= -0x8000 && expr1.X_add_number < 0x8000) { macro_build (&expr1, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); } else if (IS_SEXT_32BIT_NUM (expr1.X_add_number + 0x8000)) { unsigned int dreg; /* If we are going to add in a base register, and the target register and the base register are the same, then we are using AT as a temporary register. Since we want to load the constant into AT, we add our current AT (from the global offset table) and the register into the register now, and pretend we were not using a base register. */ if (breg != op[0]) dreg = tempreg; else { gas_assert (tempreg == AT); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", op[0], AT, breg); dreg = op[0]; add_breg_early = 1; } load_register (AT, &expr1, HAVE_64BIT_ADDRESSES); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", dreg, dreg, AT); used_at = 1; } else as_bad (_("PIC code offset overflow (max 32 signed bits)")); relax_switch (); offset_expr.X_add_number = expr1.X_add_number; macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_DISP, mips_gp_register); if (add_breg_early) { macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", op[0], tempreg, breg); breg = 0; tempreg = op[0]; } relax_end (); } else if (breg == 0 && (call || tempreg == PIC_CALL_REG)) { relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_CALL16, mips_gp_register); relax_switch (); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_DISP, mips_gp_register); relax_end (); } else { macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_DISP, mips_gp_register); } } else if (mips_big_got && !HAVE_NEWABI) { int gpdelay; int lui_reloc_type = (int) BFD_RELOC_MIPS_GOT_HI16; int lw_reloc_type = (int) BFD_RELOC_MIPS_GOT_LO16; int local_reloc_type = (int) BFD_RELOC_MIPS_GOT16; /* This is the large GOT case. If this is a reference to an external symbol, and there is no constant, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16) addu $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16) or for lca or if tempreg is PIC_CALL_REG lui $tempreg,<sym> (BFD_RELOC_MIPS_CALL_HI16) addu $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_CALL_LO16) For a local symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16) If we have a small constant, and this is a reference to an external symbol, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16) addu $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16) nop addiu $tempreg,$tempreg,<constant> For a local symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $tempreg,$tempreg,<constant> (BFD_RELOC_LO16) If we have a large constant, and this is a reference to an external symbol, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16) addu $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16) lui $at,<hiconstant> addiu $at,$at,<loconstant> addu $tempreg,$tempreg,$at For a local symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) lui $at,<hiconstant> addiu $at,$at,<loconstant> (BFD_RELOC_LO16) addu $tempreg,$tempreg,$at */ expr1.X_add_number = offset_expr.X_add_number; offset_expr.X_add_number = 0; relax_start (offset_expr.X_add_symbol); gpdelay = reg_needs_delay (mips_gp_register); if (expr1.X_add_number == 0 && breg == 0 && (call || tempreg == PIC_CALL_REG)) { lui_reloc_type = (int) BFD_RELOC_MIPS_CALL_HI16; lw_reloc_type = (int) BFD_RELOC_MIPS_CALL_LO16; } macro_build (&offset_expr, "lui", LUI_FMT, tempreg, lui_reloc_type); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, mips_gp_register); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, lw_reloc_type, tempreg); if (expr1.X_add_number == 0) { if (breg != 0) { /* We're going to put in an addu instruction using tempreg, so we may as well insert the nop right now. */ load_delay_nop (); } } else if (expr1.X_add_number >= -0x8000 && expr1.X_add_number < 0x8000) { load_delay_nop (); macro_build (&expr1, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); } else { unsigned int dreg; /* If we are going to add in a base register, and the target register and the base register are the same, then we are using AT as a temporary register. Since we want to load the constant into AT, we add our current AT (from the global offset table) and the register into the register now, and pretend we were not using a base register. */ if (breg != op[0]) dreg = tempreg; else { gas_assert (tempreg == AT); load_delay_nop (); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", op[0], AT, breg); dreg = op[0]; } load_register (AT, &expr1, HAVE_64BIT_ADDRESSES); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", dreg, dreg, AT); used_at = 1; } offset_expr.X_add_number = SEXT_16BIT (expr1.X_add_number); relax_switch (); if (gpdelay) { /* This is needed because this instruction uses $gp, but the first instruction on the main stream does not. */ macro_build (NULL, "nop", ""); } macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, local_reloc_type, mips_gp_register); if (expr1.X_add_number >= -0x8000 && expr1.X_add_number < 0x8000) { load_delay_nop (); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); /* FIXME: If add_number is 0, and there was no base register, the external symbol case ended with a load, so if the symbol turns out to not be external, and the next instruction uses tempreg, an unnecessary nop will be inserted. */ } else { if (breg == op[0]) { /* We must add in the base register now, as in the external symbol case. */ gas_assert (tempreg == AT); load_delay_nop (); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", op[0], AT, breg); tempreg = op[0]; /* We set breg to 0 because we have arranged to add it in in both cases. */ breg = 0; } macro_build_lui (&expr1, AT); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", AT, AT, BFD_RELOC_LO16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, AT); used_at = 1; } relax_end (); } else if (mips_big_got && HAVE_NEWABI) { int lui_reloc_type = (int) BFD_RELOC_MIPS_GOT_HI16; int lw_reloc_type = (int) BFD_RELOC_MIPS_GOT_LO16; int add_breg_early = 0; /* This is the large GOT case. If this is a reference to an external symbol, and there is no constant, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16) add $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16) or for lca or if tempreg is PIC_CALL_REG lui $tempreg,<sym> (BFD_RELOC_MIPS_CALL_HI16) add $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_CALL_LO16) If we have a small constant, and this is a reference to an external symbol, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16) add $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16) addi $tempreg,$tempreg,<constant> If we have a large constant, and this is a reference to an external symbol, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16) addu $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16) lui $at,<hiconstant> addi $at,$at,<loconstant> add $tempreg,$tempreg,$at If we have NewABI, and we know it's a local symbol, we want lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT_PAGE) addiu $reg,$reg,<sym> (BFD_RELOC_MIPS_GOT_OFST) otherwise we have to resort to GOT_HI16/GOT_LO16. */ relax_start (offset_expr.X_add_symbol); expr1.X_add_number = offset_expr.X_add_number; offset_expr.X_add_number = 0; if (expr1.X_add_number == 0 && breg == 0 && (call || tempreg == PIC_CALL_REG)) { lui_reloc_type = (int) BFD_RELOC_MIPS_CALL_HI16; lw_reloc_type = (int) BFD_RELOC_MIPS_CALL_LO16; } macro_build (&offset_expr, "lui", LUI_FMT, tempreg, lui_reloc_type); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, mips_gp_register); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, lw_reloc_type, tempreg); if (expr1.X_add_number == 0) ; else if (expr1.X_add_number >= -0x8000 && expr1.X_add_number < 0x8000) { macro_build (&expr1, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); } else if (IS_SEXT_32BIT_NUM (expr1.X_add_number + 0x8000)) { unsigned int dreg; /* If we are going to add in a base register, and the target register and the base register are the same, then we are using AT as a temporary register. Since we want to load the constant into AT, we add our current AT (from the global offset table) and the register into the register now, and pretend we were not using a base register. */ if (breg != op[0]) dreg = tempreg; else { gas_assert (tempreg == AT); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", op[0], AT, breg); dreg = op[0]; add_breg_early = 1; } load_register (AT, &expr1, HAVE_64BIT_ADDRESSES); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", dreg, dreg, AT); used_at = 1; } else as_bad (_("PIC code offset overflow (max 32 signed bits)")); relax_switch (); offset_expr.X_add_number = expr1.X_add_number; macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_MIPS_GOT_OFST); if (add_breg_early) { macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", op[0], tempreg, breg); breg = 0; tempreg = op[0]; } relax_end (); } else abort (); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", op[0], tempreg, breg); break; case M_MSGSND: gas_assert (!mips_opts.micromips); macro_build (NULL, "c2", "C", (op[0] << 16) | 0x01); break; case M_MSGLD: gas_assert (!mips_opts.micromips); macro_build (NULL, "c2", "C", 0x02); break; case M_MSGLD_T: gas_assert (!mips_opts.micromips); macro_build (NULL, "c2", "C", (op[0] << 16) | 0x02); break; case M_MSGWAIT: gas_assert (!mips_opts.micromips); macro_build (NULL, "c2", "C", 3); break; case M_MSGWAIT_T: gas_assert (!mips_opts.micromips); macro_build (NULL, "c2", "C", (op[0] << 16) | 0x03); break; case M_J_A: /* The j instruction may not be used in PIC code, since it requires an absolute address. We convert it to a b instruction. */ if (mips_pic == NO_PIC) macro_build (&offset_expr, "j", "a"); else macro_build (&offset_expr, "b", "p"); break; /* The jal instructions must be handled as macros because when generating PIC code they expand to multi-instruction sequences. Normally they are simple instructions. */ case M_JALS_1: op[1] = op[0]; op[0] = RA; /* Fall through. */ case M_JALS_2: gas_assert (mips_opts.micromips); if (mips_opts.insn32) { as_bad (_("opcode not supported in the `insn32' mode `%s'"), str); break; } jals = 1; goto jal; case M_JAL_1: op[1] = op[0]; op[0] = RA; /* Fall through. */ case M_JAL_2: jal: if (mips_pic == NO_PIC) { s = jals ? "jalrs" : "jalr"; if (mips_opts.micromips && !mips_opts.insn32 && op[0] == RA && !(history[0].insn_mo->pinfo2 & INSN2_BRANCH_DELAY_32BIT)) macro_build (NULL, s, "mj", op[1]); else macro_build (NULL, s, JALR_FMT, op[0], op[1]); } else { int cprestore = (mips_pic == SVR4_PIC && !HAVE_NEWABI && mips_cprestore_offset >= 0); if (op[1] != PIC_CALL_REG) as_warn (_("MIPS PIC call to register other than $25")); s = ((mips_opts.micromips && !mips_opts.insn32 && (!mips_opts.noreorder || cprestore)) ? "jalrs" : "jalr"); if (mips_opts.micromips && !mips_opts.insn32 && op[0] == RA && !(history[0].insn_mo->pinfo2 & INSN2_BRANCH_DELAY_32BIT)) macro_build (NULL, s, "mj", op[1]); else macro_build (NULL, s, JALR_FMT, op[0], op[1]); if (mips_pic == SVR4_PIC && !HAVE_NEWABI) { if (mips_cprestore_offset < 0) as_warn (_("no .cprestore pseudo-op used in PIC code")); else { if (!mips_frame_reg_valid) { as_warn (_("no .frame pseudo-op used in PIC code")); /* Quiet this warning. */ mips_frame_reg_valid = 1; } if (!mips_cprestore_valid) { as_warn (_("no .cprestore pseudo-op used in PIC code")); /* Quiet this warning. */ mips_cprestore_valid = 1; } if (mips_opts.noreorder) macro_build (NULL, "nop", ""); expr1.X_add_number = mips_cprestore_offset; macro_build_ldst_constoffset (&expr1, ADDRESS_LOAD_INSN, mips_gp_register, mips_frame_reg, HAVE_64BIT_ADDRESSES); } } } break; case M_JALS_A: gas_assert (mips_opts.micromips); if (mips_opts.insn32) { as_bad (_("opcode not supported in the `insn32' mode `%s'"), str); break; } jals = 1; /* Fall through. */ case M_JAL_A: if (mips_pic == NO_PIC) macro_build (&offset_expr, jals ? "jals" : "jal", "a"); else if (mips_pic == SVR4_PIC) { /* If this is a reference to an external symbol, and we are using a small GOT, we want lw $25,<sym>($gp) (BFD_RELOC_MIPS_CALL16) nop jalr $ra,$25 nop lw $gp,cprestore($sp) The cprestore value is set using the .cprestore pseudo-op. If we are using a big GOT, we want lui $25,<sym> (BFD_RELOC_MIPS_CALL_HI16) addu $25,$25,$gp lw $25,<sym>($25) (BFD_RELOC_MIPS_CALL_LO16) nop jalr $ra,$25 nop lw $gp,cprestore($sp) If the symbol is not external, we want lw $25,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $25,$25,<sym> (BFD_RELOC_LO16) jalr $ra,$25 nop lw $gp,cprestore($sp) For NewABI, we use the same CALL16 or CALL_HI16/CALL_LO16 sequences above, minus nops, unless the symbol is local, which enables us to use GOT_PAGE/GOT_OFST (big got) or GOT_DISP. */ if (HAVE_NEWABI) { if (!mips_big_got) { relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", PIC_CALL_REG, BFD_RELOC_MIPS_CALL16, mips_gp_register); relax_switch (); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", PIC_CALL_REG, BFD_RELOC_MIPS_GOT_DISP, mips_gp_register); relax_end (); } else { relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, "lui", LUI_FMT, PIC_CALL_REG, BFD_RELOC_MIPS_CALL_HI16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", PIC_CALL_REG, PIC_CALL_REG, mips_gp_register); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", PIC_CALL_REG, BFD_RELOC_MIPS_CALL_LO16, PIC_CALL_REG); relax_switch (); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", PIC_CALL_REG, BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", PIC_CALL_REG, PIC_CALL_REG, BFD_RELOC_MIPS_GOT_OFST); relax_end (); } macro_build_jalr (&offset_expr, 0); } else { relax_start (offset_expr.X_add_symbol); if (!mips_big_got) { macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", PIC_CALL_REG, BFD_RELOC_MIPS_CALL16, mips_gp_register); load_delay_nop (); relax_switch (); } else { int gpdelay; gpdelay = reg_needs_delay (mips_gp_register); macro_build (&offset_expr, "lui", LUI_FMT, PIC_CALL_REG, BFD_RELOC_MIPS_CALL_HI16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", PIC_CALL_REG, PIC_CALL_REG, mips_gp_register); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", PIC_CALL_REG, BFD_RELOC_MIPS_CALL_LO16, PIC_CALL_REG); load_delay_nop (); relax_switch (); if (gpdelay) macro_build (NULL, "nop", ""); } macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", PIC_CALL_REG, BFD_RELOC_MIPS_GOT16, mips_gp_register); load_delay_nop (); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", PIC_CALL_REG, PIC_CALL_REG, BFD_RELOC_LO16); relax_end (); macro_build_jalr (&offset_expr, mips_cprestore_offset >= 0); if (mips_cprestore_offset < 0) as_warn (_("no .cprestore pseudo-op used in PIC code")); else { if (!mips_frame_reg_valid) { as_warn (_("no .frame pseudo-op used in PIC code")); /* Quiet this warning. */ mips_frame_reg_valid = 1; } if (!mips_cprestore_valid) { as_warn (_("no .cprestore pseudo-op used in PIC code")); /* Quiet this warning. */ mips_cprestore_valid = 1; } if (mips_opts.noreorder) macro_build (NULL, "nop", ""); expr1.X_add_number = mips_cprestore_offset; macro_build_ldst_constoffset (&expr1, ADDRESS_LOAD_INSN, mips_gp_register, mips_frame_reg, HAVE_64BIT_ADDRESSES); } } } else if (mips_pic == VXWORKS_PIC) as_bad (_("non-PIC jump used in PIC library")); else abort (); break; case M_LBUE_AB: s = "lbue"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_LHUE_AB: s = "lhue"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_LBE_AB: s = "lbe"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_LHE_AB: s = "lhe"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_LLE_AB: s = "lle"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_LWE_AB: s = "lwe"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_LWLE_AB: s = "lwle"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_LWRE_AB: s = "lwre"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_SBE_AB: s = "sbe"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_SCE_AB: s = "sce"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_SHE_AB: s = "she"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_SWE_AB: s = "swe"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_SWLE_AB: s = "swle"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_SWRE_AB: s = "swre"; fmt = "t,+j(b)"; offbits = 9; goto ld_st; case M_ACLR_AB: s = "aclr"; fmt = "\\,~(b)"; offbits = 12; goto ld_st; case M_ASET_AB: s = "aset"; fmt = "\\,~(b)"; offbits = 12; goto ld_st; case M_LB_AB: s = "lb"; fmt = "t,o(b)"; goto ld; case M_LBU_AB: s = "lbu"; fmt = "t,o(b)"; goto ld; case M_LH_AB: s = "lh"; fmt = "t,o(b)"; goto ld; case M_LHU_AB: s = "lhu"; fmt = "t,o(b)"; goto ld; case M_LW_AB: s = "lw"; fmt = "t,o(b)"; goto ld; case M_LWC0_AB: gas_assert (!mips_opts.micromips); s = "lwc0"; fmt = "E,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_LWC1_AB: s = "lwc1"; fmt = "T,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_LWC2_AB: s = "lwc2"; fmt = COP12_FMT; offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 11 : 16); /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_LWC3_AB: gas_assert (!mips_opts.micromips); s = "lwc3"; fmt = "E,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_LWL_AB: s = "lwl"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld_st; case M_LWR_AB: s = "lwr"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld_st; case M_LDC1_AB: s = "ldc1"; fmt = "T,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_LDC2_AB: s = "ldc2"; fmt = COP12_FMT; offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 11 : 16); /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_LQC2_AB: s = "lqc2"; fmt = "+7,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_LDC3_AB: s = "ldc3"; fmt = "E,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_LDL_AB: s = "ldl"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld_st; case M_LDR_AB: s = "ldr"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld_st; case M_LL_AB: s = "ll"; fmt = LL_SC_FMT; offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 9 : 16); goto ld; case M_LLD_AB: s = "lld"; fmt = LL_SC_FMT; offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 9 : 16); goto ld; case M_LWU_AB: s = "lwu"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld; case M_LWP_AB: gas_assert (mips_opts.micromips); s = "lwp"; fmt = "t,~(b)"; offbits = 12; lp = 1; goto ld; case M_LDP_AB: gas_assert (mips_opts.micromips); s = "ldp"; fmt = "t,~(b)"; offbits = 12; lp = 1; goto ld; case M_LWM_AB: gas_assert (mips_opts.micromips); s = "lwm"; fmt = "n,~(b)"; offbits = 12; goto ld_st; case M_LDM_AB: gas_assert (mips_opts.micromips); s = "ldm"; fmt = "n,~(b)"; offbits = 12; goto ld_st; ld: /* We don't want to use $0 as tempreg. */ if (op[2] == op[0] + lp || op[0] + lp == ZERO) goto ld_st; else tempreg = op[0] + lp; goto ld_noat; case M_SB_AB: s = "sb"; fmt = "t,o(b)"; goto ld_st; case M_SH_AB: s = "sh"; fmt = "t,o(b)"; goto ld_st; case M_SW_AB: s = "sw"; fmt = "t,o(b)"; goto ld_st; case M_SWC0_AB: gas_assert (!mips_opts.micromips); s = "swc0"; fmt = "E,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_SWC1_AB: s = "swc1"; fmt = "T,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_SWC2_AB: s = "swc2"; fmt = COP12_FMT; offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 11 : 16); /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_SWC3_AB: gas_assert (!mips_opts.micromips); s = "swc3"; fmt = "E,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_SWL_AB: s = "swl"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld_st; case M_SWR_AB: s = "swr"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld_st; case M_SC_AB: s = "sc"; fmt = LL_SC_FMT; offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 9 : 16); goto ld_st; case M_SCD_AB: s = "scd"; fmt = LL_SC_FMT; offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 9 : 16); goto ld_st; case M_CACHE_AB: s = "cache"; fmt = (mips_opts.micromips ? "k,~(b)" : ISA_IS_R6 (mips_opts.isa) ? "k,+j(b)" : "k,o(b)"); offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 9 : 16); goto ld_st; case M_CACHEE_AB: s = "cachee"; fmt = "k,+j(b)"; offbits = 9; goto ld_st; case M_PREF_AB: s = "pref"; fmt = (mips_opts.micromips ? "k,~(b)" : ISA_IS_R6 (mips_opts.isa) ? "k,+j(b)" : "k,o(b)"); offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 9 : 16); goto ld_st; case M_PREFE_AB: s = "prefe"; fmt = "k,+j(b)"; offbits = 9; goto ld_st; case M_SDC1_AB: s = "sdc1"; fmt = "T,o(b)"; coproc = 1; /* Itbl support may require additional care here. */ goto ld_st; case M_SDC2_AB: s = "sdc2"; fmt = COP12_FMT; offbits = (mips_opts.micromips ? 12 : ISA_IS_R6 (mips_opts.isa) ? 11 : 16); /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_SQC2_AB: s = "sqc2"; fmt = "+7,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_SDC3_AB: gas_assert (!mips_opts.micromips); s = "sdc3"; fmt = "E,o(b)"; /* Itbl support may require additional care here. */ coproc = 1; goto ld_st; case M_SDL_AB: s = "sdl"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld_st; case M_SDR_AB: s = "sdr"; fmt = MEM12_FMT; offbits = (mips_opts.micromips ? 12 : 16); goto ld_st; case M_SWP_AB: gas_assert (mips_opts.micromips); s = "swp"; fmt = "t,~(b)"; offbits = 12; goto ld_st; case M_SDP_AB: gas_assert (mips_opts.micromips); s = "sdp"; fmt = "t,~(b)"; offbits = 12; goto ld_st; case M_SWM_AB: gas_assert (mips_opts.micromips); s = "swm"; fmt = "n,~(b)"; offbits = 12; goto ld_st; case M_SDM_AB: gas_assert (mips_opts.micromips); s = "sdm"; fmt = "n,~(b)"; offbits = 12; ld_st: tempreg = AT; ld_noat: breg = op[2]; if (small_offset_p (0, align, 16)) { /* The first case exists for M_LD_AB and M_SD_AB, which are macros for o32 but which should act like normal instructions otherwise. */ if (offbits == 16) macro_build (&offset_expr, s, fmt, op[0], -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); else if (small_offset_p (0, align, offbits)) { if (offbits == 0) macro_build (NULL, s, fmt, op[0], breg); else macro_build (NULL, s, fmt, op[0], (int) offset_expr.X_add_number, breg); } else { if (tempreg == AT) used_at = 1; macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, breg, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2]); if (offbits == 0) macro_build (NULL, s, fmt, op[0], tempreg); else macro_build (NULL, s, fmt, op[0], 0, tempreg); } break; } if (tempreg == AT) used_at = 1; if (offset_expr.X_op != O_constant && offset_expr.X_op != O_symbol) { as_bad (_("expression too complex")); offset_expr.X_op = O_constant; } if (HAVE_32BIT_ADDRESSES && !IS_SEXT_32BIT_NUM (offset_expr.X_add_number)) { char value [32]; sprintf_vma (value, offset_expr.X_add_number); as_bad (_("number (0x%s) larger than 32 bits"), value); } /* A constant expression in PIC code can be handled just as it is in non PIC code. */ if (offset_expr.X_op == O_constant) { expr1.X_add_number = offset_high_part (offset_expr.X_add_number, offbits == 0 ? 16 : offbits); offset_expr.X_add_number -= expr1.X_add_number; load_register (tempreg, &expr1, HAVE_64BIT_ADDRESSES); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); if (offbits == 0) { if (offset_expr.X_add_number != 0) macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); macro_build (NULL, s, fmt, op[0], tempreg); } else if (offbits == 16) macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_LO16, tempreg); else macro_build (NULL, s, fmt, op[0], (int) offset_expr.X_add_number, tempreg); } else if (offbits != 16) { /* The offset field is too narrow to be used for a low-part relocation, so load the whole address into the auxiliary register. */ load_address (tempreg, &offset_expr, &used_at); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); if (offbits == 0) macro_build (NULL, s, fmt, op[0], tempreg); else macro_build (NULL, s, fmt, op[0], 0, tempreg); } else if (mips_pic == NO_PIC) { /* If this is a reference to a GP relative symbol, and there is no base register, we want <op> op[0],<sym>($gp) (BFD_RELOC_GPREL16) Otherwise, if there is no base register, we want lui $tempreg,<sym> (BFD_RELOC_HI16_S) <op> op[0],<sym>($tempreg) (BFD_RELOC_LO16) If we have a constant, we need two instructions anyhow, so we always use the latter form. If we have a base register, and this is a reference to a GP relative symbol, we want addu $tempreg,$breg,$gp <op> op[0],<sym>($tempreg) (BFD_RELOC_GPREL16) Otherwise we want lui $tempreg,<sym> (BFD_RELOC_HI16_S) addu $tempreg,$tempreg,$breg <op> op[0],<sym>($tempreg) (BFD_RELOC_LO16) With a constant we always use the latter case. With 64bit address space and no base register and $at usable, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST) lui $at,<sym> (BFD_RELOC_HI16_S) daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER) dsll32 $tempreg,0 daddu $tempreg,$at <op> op[0],<sym>($tempreg) (BFD_RELOC_LO16) If we have a base register, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST) lui $at,<sym> (BFD_RELOC_HI16_S) daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER) daddu $at,$breg dsll32 $tempreg,0 daddu $tempreg,$at <op> op[0],<sym>($tempreg) (BFD_RELOC_LO16) Without $at we can't generate the optimal path for superscalar processors here since this would require two temporary registers. lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST) daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER) dsll $tempreg,16 daddiu $tempreg,<sym> (BFD_RELOC_HI16_S) dsll $tempreg,16 <op> op[0],<sym>($tempreg) (BFD_RELOC_LO16) If we have a base register, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST) daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER) dsll $tempreg,16 daddiu $tempreg,<sym> (BFD_RELOC_HI16_S) dsll $tempreg,16 daddu $tempreg,$tempreg,$breg <op> op[0],<sym>($tempreg) (BFD_RELOC_LO16) For GP relative symbols in 64bit address space we can use the same sequence as in 32bit address space. */ if (HAVE_64BIT_SYMBOLS) { if ((valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET && !nopic_need_relax (offset_expr.X_add_symbol, 1)) { relax_start (offset_expr.X_add_symbol); if (breg == 0) { macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_GPREL16, mips_gp_register); } else { macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, breg, mips_gp_register); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_GPREL16, tempreg); } relax_switch (); } if (used_at == 0 && mips_opts.at) { macro_build (&offset_expr, "lui", LUI_FMT, tempreg, BFD_RELOC_MIPS_HIGHEST); macro_build (&offset_expr, "lui", LUI_FMT, AT, BFD_RELOC_HI16_S); macro_build (&offset_expr, "daddiu", "t,r,j", tempreg, tempreg, BFD_RELOC_MIPS_HIGHER); if (breg != 0) macro_build (NULL, "daddu", "d,v,t", AT, AT, breg); macro_build (NULL, "dsll32", SHFT_FMT, tempreg, tempreg, 0); macro_build (NULL, "daddu", "d,v,t", tempreg, tempreg, AT); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_LO16, tempreg); used_at = 1; } else { macro_build (&offset_expr, "lui", LUI_FMT, tempreg, BFD_RELOC_MIPS_HIGHEST); macro_build (&offset_expr, "daddiu", "t,r,j", tempreg, tempreg, BFD_RELOC_MIPS_HIGHER); macro_build (NULL, "dsll", SHFT_FMT, tempreg, tempreg, 16); macro_build (&offset_expr, "daddiu", "t,r,j", tempreg, tempreg, BFD_RELOC_HI16_S); macro_build (NULL, "dsll", SHFT_FMT, tempreg, tempreg, 16); if (breg != 0) macro_build (NULL, "daddu", "d,v,t", tempreg, tempreg, breg); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_LO16, tempreg); } if (mips_relax.sequence) relax_end (); break; } if (breg == 0) { if ((valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET && !nopic_need_relax (offset_expr.X_add_symbol, 1)) { relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_GPREL16, mips_gp_register); relax_switch (); } macro_build_lui (&offset_expr, tempreg); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_LO16, tempreg); if (mips_relax.sequence) relax_end (); } else { if ((valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET && !nopic_need_relax (offset_expr.X_add_symbol, 1)) { relax_start (offset_expr.X_add_symbol); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, breg, mips_gp_register); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_GPREL16, tempreg); relax_switch (); } macro_build_lui (&offset_expr, tempreg); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_LO16, tempreg); if (mips_relax.sequence) relax_end (); } } else if (!mips_big_got) { int lw_reloc_type = (int) BFD_RELOC_MIPS_GOT16; /* If this is a reference to an external symbol, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop <op> op[0],0($tempreg) Otherwise we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16) <op> op[0],0($tempreg) For NewABI, we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_PAGE) <op> op[0],<sym>($tempreg) (BFD_RELOC_MIPS_GOT_OFST) If there is a base register, we add it to $tempreg before the <op>. If there is a constant, we stick it in the <op> instruction. We don't handle constants larger than 16 bits, because we have no way to load the upper 16 bits (actually, we could handle them for the subset of cases in which we are not using $at). */ gas_assert (offset_expr.X_op == O_symbol); if (HAVE_NEWABI) { macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_MIPS_GOT_OFST, tempreg); break; } expr1.X_add_number = offset_expr.X_add_number; offset_expr.X_add_number = 0; if (expr1.X_add_number < -0x8000 || expr1.X_add_number >= 0x8000) as_bad (_("PIC code offset overflow (max 16 signed bits)")); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, lw_reloc_type, mips_gp_register); load_delay_nop (); relax_start (offset_expr.X_add_symbol); relax_switch (); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); relax_end (); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); macro_build (&expr1, s, fmt, op[0], BFD_RELOC_LO16, tempreg); } else if (mips_big_got && !HAVE_NEWABI) { int gpdelay; /* If this is a reference to an external symbol, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16) addu $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16) <op> op[0],0($tempreg) Otherwise we want lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16) <op> op[0],0($tempreg) If there is a base register, we add it to $tempreg before the <op>. If there is a constant, we stick it in the <op> instruction. We don't handle constants larger than 16 bits, because we have no way to load the upper 16 bits (actually, we could handle them for the subset of cases in which we are not using $at). */ gas_assert (offset_expr.X_op == O_symbol); expr1.X_add_number = offset_expr.X_add_number; offset_expr.X_add_number = 0; if (expr1.X_add_number < -0x8000 || expr1.X_add_number >= 0x8000) as_bad (_("PIC code offset overflow (max 16 signed bits)")); gpdelay = reg_needs_delay (mips_gp_register); relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, "lui", LUI_FMT, tempreg, BFD_RELOC_MIPS_GOT_HI16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, mips_gp_register); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_LO16, tempreg); relax_switch (); if (gpdelay) macro_build (NULL, "nop", ""); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT16, mips_gp_register); load_delay_nop (); macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg, tempreg, BFD_RELOC_LO16); relax_end (); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); macro_build (&expr1, s, fmt, op[0], BFD_RELOC_LO16, tempreg); } else if (mips_big_got && HAVE_NEWABI) { /* If this is a reference to an external symbol, we want lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16) add $tempreg,$tempreg,$gp lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16) <op> op[0],<ofst>($tempreg) Otherwise, for local symbols, we want: lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_PAGE) <op> op[0],<sym>($tempreg) (BFD_RELOC_MIPS_GOT_OFST) */ gas_assert (offset_expr.X_op == O_symbol); expr1.X_add_number = offset_expr.X_add_number; offset_expr.X_add_number = 0; if (expr1.X_add_number < -0x8000 || expr1.X_add_number >= 0x8000) as_bad (_("PIC code offset overflow (max 16 signed bits)")); relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, "lui", LUI_FMT, tempreg, BFD_RELOC_MIPS_GOT_HI16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, mips_gp_register); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_LO16, tempreg); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); macro_build (&expr1, s, fmt, op[0], BFD_RELOC_LO16, tempreg); relax_switch (); offset_expr.X_add_number = expr1.X_add_number; macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg, BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); macro_build (&offset_expr, s, fmt, op[0], BFD_RELOC_MIPS_GOT_OFST, tempreg); relax_end (); } else abort (); break; case M_JRADDIUSP: gas_assert (mips_opts.micromips); gas_assert (mips_opts.insn32); start_noreorder (); macro_build (NULL, "jr", "s", RA); expr1.X_add_number = op[0] << 2; macro_build (&expr1, "addiu", "t,r,j", SP, SP, BFD_RELOC_LO16); end_noreorder (); break; case M_JRC: gas_assert (mips_opts.micromips); gas_assert (mips_opts.insn32); macro_build (NULL, "jr", "s", op[0]); if (mips_opts.noreorder) macro_build (NULL, "nop", ""); break; case M_LI: case M_LI_S: load_register (op[0], &imm_expr, 0); break; case M_DLI: load_register (op[0], &imm_expr, 1); break; case M_LI_SS: if (imm_expr.X_op == O_constant) { used_at = 1; load_register (AT, &imm_expr, 0); macro_build (NULL, "mtc1", "t,G", AT, op[0]); break; } else { gas_assert (imm_expr.X_op == O_absent && offset_expr.X_op == O_symbol && strcmp (segment_name (S_GET_SEGMENT (offset_expr.X_add_symbol)), ".lit4") == 0 && offset_expr.X_add_number == 0); macro_build (&offset_expr, "lwc1", "T,o(b)", op[0], BFD_RELOC_MIPS_LITERAL, mips_gp_register); break; } case M_LI_D: /* Check if we have a constant in IMM_EXPR. If the GPRs are 64 bits wide, IMM_EXPR is the entire value. Otherwise IMM_EXPR is the high order 32 bits of the value and the low order 32 bits are either zero or in OFFSET_EXPR. */ if (imm_expr.X_op == O_constant) { if (GPR_SIZE == 64) load_register (op[0], &imm_expr, 1); else { int hreg, lreg; if (target_big_endian) { hreg = op[0]; lreg = op[0] + 1; } else { hreg = op[0] + 1; lreg = op[0]; } if (hreg <= 31) load_register (hreg, &imm_expr, 0); if (lreg <= 31) { if (offset_expr.X_op == O_absent) move_register (lreg, 0); else { gas_assert (offset_expr.X_op == O_constant); load_register (lreg, &offset_expr, 0); } } } break; } gas_assert (imm_expr.X_op == O_absent); /* We know that sym is in the .rdata section. First we get the upper 16 bits of the address. */ if (mips_pic == NO_PIC) { macro_build_lui (&offset_expr, AT); used_at = 1; } else { macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", AT, BFD_RELOC_MIPS_GOT16, mips_gp_register); used_at = 1; } /* Now we load the register(s). */ if (GPR_SIZE == 64) { used_at = 1; macro_build (&offset_expr, "ld", "t,o(b)", op[0], BFD_RELOC_LO16, AT); } else { used_at = 1; macro_build (&offset_expr, "lw", "t,o(b)", op[0], BFD_RELOC_LO16, AT); if (op[0] != RA) { /* FIXME: How in the world do we deal with the possible overflow here? */ offset_expr.X_add_number += 4; macro_build (&offset_expr, "lw", "t,o(b)", op[0] + 1, BFD_RELOC_LO16, AT); } } break; case M_LI_DD: /* Check if we have a constant in IMM_EXPR. If the FPRs are 64 bits wide, IMM_EXPR is the entire value and the GPRs are known to be 64 bits wide as well. Otherwise IMM_EXPR is the high order 32 bits of the value and the low order 32 bits are either zero or in OFFSET_EXPR. */ if (imm_expr.X_op == O_constant) { used_at = 1; load_register (AT, &imm_expr, FPR_SIZE == 64); if (FPR_SIZE == 64 && GPR_SIZE == 64) macro_build (NULL, "dmtc1", "t,S", AT, op[0]); else { if (ISA_HAS_MXHC1 (mips_opts.isa)) macro_build (NULL, "mthc1", "t,G", AT, op[0]); else if (FPR_SIZE != 32) as_bad (_("Unable to generate `%s' compliant code " "without mthc1"), (FPR_SIZE == 64) ? "fp64" : "fpxx"); else macro_build (NULL, "mtc1", "t,G", AT, op[0] + 1); if (offset_expr.X_op == O_absent) macro_build (NULL, "mtc1", "t,G", 0, op[0]); else { gas_assert (offset_expr.X_op == O_constant); load_register (AT, &offset_expr, 0); macro_build (NULL, "mtc1", "t,G", AT, op[0]); } } break; } gas_assert (imm_expr.X_op == O_absent && offset_expr.X_op == O_symbol && offset_expr.X_add_number == 0); s = segment_name (S_GET_SEGMENT (offset_expr.X_add_symbol)); if (strcmp (s, ".lit8") == 0) { op[2] = mips_gp_register; offset_reloc[0] = BFD_RELOC_MIPS_LITERAL; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; } else { gas_assert (strcmp (s, RDATA_SECTION_NAME) == 0); used_at = 1; if (mips_pic != NO_PIC) macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", AT, BFD_RELOC_MIPS_GOT16, mips_gp_register); else { /* FIXME: This won't work for a 64 bit address. */ macro_build_lui (&offset_expr, AT); } op[2] = AT; offset_reloc[0] = BFD_RELOC_LO16; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; } align = 8; /* Fall through */ case M_L_DAB: /* * The MIPS assembler seems to check for X_add_number not * being double aligned and generating: * lui at,%hi(foo+1) * addu at,at,v1 * addiu at,at,%lo(foo+1) * lwc1 f2,0(at) * lwc1 f3,4(at) * But, the resulting address is the same after relocation so why * generate the extra instruction? */ /* Itbl support may require additional care here. */ coproc = 1; fmt = "T,o(b)"; if (CPU_HAS_LDC1_SDC1 (mips_opts.arch)) { s = "ldc1"; goto ld_st; } s = "lwc1"; goto ldd_std; case M_S_DAB: gas_assert (!mips_opts.micromips); /* Itbl support may require additional care here. */ coproc = 1; fmt = "T,o(b)"; if (CPU_HAS_LDC1_SDC1 (mips_opts.arch)) { s = "sdc1"; goto ld_st; } s = "swc1"; goto ldd_std; case M_LQ_AB: fmt = "t,o(b)"; s = "lq"; goto ld; case M_SQ_AB: fmt = "t,o(b)"; s = "sq"; goto ld_st; case M_LD_AB: fmt = "t,o(b)"; if (GPR_SIZE == 64) { s = "ld"; goto ld; } s = "lw"; goto ldd_std; case M_SD_AB: fmt = "t,o(b)"; if (GPR_SIZE == 64) { s = "sd"; goto ld_st; } s = "sw"; ldd_std: /* Even on a big endian machine $fn comes before $fn+1. We have to adjust when loading from memory. We set coproc if we must load $fn+1 first. */ /* Itbl support may require additional care here. */ if (!target_big_endian) coproc = 0; breg = op[2]; if (small_offset_p (0, align, 16)) { ep = &offset_expr; if (!small_offset_p (4, align, 16)) { macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", AT, breg, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2]); expr1.X_add_number = 0; ep = &expr1; breg = AT; used_at = 1; offset_reloc[0] = BFD_RELOC_LO16; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; } if (strcmp (s, "lw") == 0 && op[0] == breg) { ep->X_add_number += 4; macro_build (ep, s, fmt, op[0] + 1, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); ep->X_add_number -= 4; macro_build (ep, s, fmt, op[0], -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); } else { macro_build (ep, s, fmt, coproc ? op[0] + 1 : op[0], -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); ep->X_add_number += 4; macro_build (ep, s, fmt, coproc ? op[0] : op[0] + 1, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); } break; } if (offset_expr.X_op != O_symbol && offset_expr.X_op != O_constant) { as_bad (_("expression too complex")); offset_expr.X_op = O_constant; } if (HAVE_32BIT_ADDRESSES && !IS_SEXT_32BIT_NUM (offset_expr.X_add_number)) { char value [32]; sprintf_vma (value, offset_expr.X_add_number); as_bad (_("number (0x%s) larger than 32 bits"), value); } if (mips_pic == NO_PIC || offset_expr.X_op == O_constant) { /* If this is a reference to a GP relative symbol, we want <op> op[0],<sym>($gp) (BFD_RELOC_GPREL16) <op> op[0]+1,<sym>+4($gp) (BFD_RELOC_GPREL16) If we have a base register, we use this addu $at,$breg,$gp <op> op[0],<sym>($at) (BFD_RELOC_GPREL16) <op> op[0]+1,<sym>+4($at) (BFD_RELOC_GPREL16) If this is not a GP relative symbol, we want lui $at,<sym> (BFD_RELOC_HI16_S) <op> op[0],<sym>($at) (BFD_RELOC_LO16) <op> op[0]+1,<sym>+4($at) (BFD_RELOC_LO16) If there is a base register, we add it to $at after the lui instruction. If there is a constant, we always use the last case. */ if (offset_expr.X_op == O_symbol && (valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET && !nopic_need_relax (offset_expr.X_add_symbol, 1)) { relax_start (offset_expr.X_add_symbol); if (breg == 0) { tempreg = mips_gp_register; } else { macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, mips_gp_register); tempreg = AT; used_at = 1; } /* Itbl support may require additional care here. */ macro_build (&offset_expr, s, fmt, coproc ? op[0] + 1 : op[0], BFD_RELOC_GPREL16, tempreg); offset_expr.X_add_number += 4; /* Set mips_optimize to 2 to avoid inserting an undesired nop. */ hold_mips_optimize = mips_optimize; mips_optimize = 2; /* Itbl support may require additional care here. */ macro_build (&offset_expr, s, fmt, coproc ? op[0] : op[0] + 1, BFD_RELOC_GPREL16, tempreg); mips_optimize = hold_mips_optimize; relax_switch (); offset_expr.X_add_number -= 4; } used_at = 1; if (offset_high_part (offset_expr.X_add_number, 16) != offset_high_part (offset_expr.X_add_number + 4, 16)) { load_address (AT, &offset_expr, &used_at); offset_expr.X_op = O_constant; offset_expr.X_add_number = 0; } else macro_build_lui (&offset_expr, AT); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, AT); /* Itbl support may require additional care here. */ macro_build (&offset_expr, s, fmt, coproc ? op[0] + 1 : op[0], BFD_RELOC_LO16, AT); /* FIXME: How do we handle overflow here? */ offset_expr.X_add_number += 4; /* Itbl support may require additional care here. */ macro_build (&offset_expr, s, fmt, coproc ? op[0] : op[0] + 1, BFD_RELOC_LO16, AT); if (mips_relax.sequence) relax_end (); } else if (!mips_big_got) { /* If this is a reference to an external symbol, we want lw $at,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop <op> op[0],0($at) <op> op[0]+1,4($at) Otherwise we want lw $at,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop <op> op[0],<sym>($at) (BFD_RELOC_LO16) <op> op[0]+1,<sym>+4($at) (BFD_RELOC_LO16) If there is a base register we add it to $at before the lwc1 instructions. If there is a constant we include it in the lwc1 instructions. */ used_at = 1; expr1.X_add_number = offset_expr.X_add_number; if (expr1.X_add_number < -0x8000 || expr1.X_add_number >= 0x8000 - 4) as_bad (_("PIC code offset overflow (max 16 signed bits)")); load_got_offset (AT, &offset_expr); load_delay_nop (); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, AT); /* Set mips_optimize to 2 to avoid inserting an undesired nop. */ hold_mips_optimize = mips_optimize; mips_optimize = 2; /* Itbl support may require additional care here. */ relax_start (offset_expr.X_add_symbol); macro_build (&expr1, s, fmt, coproc ? op[0] + 1 : op[0], BFD_RELOC_LO16, AT); expr1.X_add_number += 4; macro_build (&expr1, s, fmt, coproc ? op[0] : op[0] + 1, BFD_RELOC_LO16, AT); relax_switch (); macro_build (&offset_expr, s, fmt, coproc ? op[0] + 1 : op[0], BFD_RELOC_LO16, AT); offset_expr.X_add_number += 4; macro_build (&offset_expr, s, fmt, coproc ? op[0] : op[0] + 1, BFD_RELOC_LO16, AT); relax_end (); mips_optimize = hold_mips_optimize; } else if (mips_big_got) { int gpdelay; /* If this is a reference to an external symbol, we want lui $at,<sym> (BFD_RELOC_MIPS_GOT_HI16) addu $at,$at,$gp lw $at,<sym>($at) (BFD_RELOC_MIPS_GOT_LO16) nop <op> op[0],0($at) <op> op[0]+1,4($at) Otherwise we want lw $at,<sym>($gp) (BFD_RELOC_MIPS_GOT16) nop <op> op[0],<sym>($at) (BFD_RELOC_LO16) <op> op[0]+1,<sym>+4($at) (BFD_RELOC_LO16) If there is a base register we add it to $at before the lwc1 instructions. If there is a constant we include it in the lwc1 instructions. */ used_at = 1; expr1.X_add_number = offset_expr.X_add_number; offset_expr.X_add_number = 0; if (expr1.X_add_number < -0x8000 || expr1.X_add_number >= 0x8000 - 4) as_bad (_("PIC code offset overflow (max 16 signed bits)")); gpdelay = reg_needs_delay (mips_gp_register); relax_start (offset_expr.X_add_symbol); macro_build (&offset_expr, "lui", LUI_FMT, AT, BFD_RELOC_MIPS_GOT_HI16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, AT, mips_gp_register); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", AT, BFD_RELOC_MIPS_GOT_LO16, AT); load_delay_nop (); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, AT); /* Itbl support may require additional care here. */ macro_build (&expr1, s, fmt, coproc ? op[0] + 1 : op[0], BFD_RELOC_LO16, AT); expr1.X_add_number += 4; /* Set mips_optimize to 2 to avoid inserting an undesired nop. */ hold_mips_optimize = mips_optimize; mips_optimize = 2; /* Itbl support may require additional care here. */ macro_build (&expr1, s, fmt, coproc ? op[0] : op[0] + 1, BFD_RELOC_LO16, AT); mips_optimize = hold_mips_optimize; expr1.X_add_number -= 4; relax_switch (); offset_expr.X_add_number = expr1.X_add_number; if (gpdelay) macro_build (NULL, "nop", ""); macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", AT, BFD_RELOC_MIPS_GOT16, mips_gp_register); load_delay_nop (); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, AT); /* Itbl support may require additional care here. */ macro_build (&offset_expr, s, fmt, coproc ? op[0] + 1 : op[0], BFD_RELOC_LO16, AT); offset_expr.X_add_number += 4; /* Set mips_optimize to 2 to avoid inserting an undesired nop. */ hold_mips_optimize = mips_optimize; mips_optimize = 2; /* Itbl support may require additional care here. */ macro_build (&offset_expr, s, fmt, coproc ? op[0] : op[0] + 1, BFD_RELOC_LO16, AT); mips_optimize = hold_mips_optimize; relax_end (); } else abort (); break; case M_SAA_AB: s = "saa"; goto saa_saad; case M_SAAD_AB: s = "saad"; saa_saad: gas_assert (!mips_opts.micromips); offbits = 0; fmt = "t,(b)"; goto ld_st; /* New code added to support COPZ instructions. This code builds table entries out of the macros in mip_opcodes. R4000 uses interlocks to handle coproc delays. Other chips (like the R3000) require nops to be inserted for delays. FIXME: Currently, we require that the user handle delays. In order to fill delay slots for non-interlocked chips, we must have a way to specify delays based on the coprocessor. Eg. 4 cycles if load coproc reg from memory, 1 if in cache, etc. What are the side-effects of the cop instruction? What cache support might we have and what are its effects? Both coprocessor & memory require delays. how long??? What registers are read/set/modified? If an itbl is provided to interpret cop instructions, this knowledge can be encoded in the itbl spec. */ case M_COP0: s = "c0"; goto copz; case M_COP1: s = "c1"; goto copz; case M_COP2: s = "c2"; goto copz; case M_COP3: s = "c3"; copz: gas_assert (!mips_opts.micromips); /* For now we just do C (same as Cz). The parameter will be stored in insn_opcode by mips_ip. */ macro_build (NULL, s, "C", (int) ip->insn_opcode); break; case M_MOVE: move_register (op[0], op[1]); break; case M_MOVEP: gas_assert (mips_opts.micromips); gas_assert (mips_opts.insn32); move_register (micromips_to_32_reg_h_map1[op[0]], micromips_to_32_reg_m_map[op[1]]); move_register (micromips_to_32_reg_h_map2[op[0]], micromips_to_32_reg_n_map[op[2]]); break; case M_DMUL: dbl = 1; /* Fall through. */ case M_MUL: if (mips_opts.arch == CPU_R5900) macro_build (NULL, dbl ? "dmultu" : "multu", "d,s,t", op[0], op[1], op[2]); else { macro_build (NULL, dbl ? "dmultu" : "multu", "s,t", op[1], op[2]); macro_build (NULL, "mflo", MFHL_FMT, op[0]); } break; case M_DMUL_I: dbl = 1; /* Fall through. */ case M_MUL_I: /* The MIPS assembler some times generates shifts and adds. I'm not trying to be that fancy. GCC should do this for us anyway. */ used_at = 1; load_register (AT, &imm_expr, dbl); macro_build (NULL, dbl ? "dmult" : "mult", "s,t", op[1], AT); macro_build (NULL, "mflo", MFHL_FMT, op[0]); break; case M_DMULO_I: dbl = 1; /* Fall through. */ case M_MULO_I: imm = 1; goto do_mulo; case M_DMULO: dbl = 1; /* Fall through. */ case M_MULO: do_mulo: start_noreorder (); used_at = 1; if (imm) load_register (AT, &imm_expr, dbl); macro_build (NULL, dbl ? "dmult" : "mult", "s,t", op[1], imm ? AT : op[2]); macro_build (NULL, "mflo", MFHL_FMT, op[0]); macro_build (NULL, dbl ? "dsra32" : "sra", SHFT_FMT, op[0], op[0], 31); macro_build (NULL, "mfhi", MFHL_FMT, AT); if (mips_trap) macro_build (NULL, "tne", TRAP_FMT, op[0], AT, 6); else { if (mips_opts.micromips) micromips_label_expr (&label_expr); else label_expr.X_add_number = 8; macro_build (&label_expr, "beq", "s,t,p", op[0], AT); macro_build (NULL, "nop", ""); macro_build (NULL, "break", BRK_FMT, 6); if (mips_opts.micromips) micromips_add_label (); } end_noreorder (); macro_build (NULL, "mflo", MFHL_FMT, op[0]); break; case M_DMULOU_I: dbl = 1; /* Fall through. */ case M_MULOU_I: imm = 1; goto do_mulou; case M_DMULOU: dbl = 1; /* Fall through. */ case M_MULOU: do_mulou: start_noreorder (); used_at = 1; if (imm) load_register (AT, &imm_expr, dbl); macro_build (NULL, dbl ? "dmultu" : "multu", "s,t", op[1], imm ? AT : op[2]); macro_build (NULL, "mfhi", MFHL_FMT, AT); macro_build (NULL, "mflo", MFHL_FMT, op[0]); if (mips_trap) macro_build (NULL, "tne", TRAP_FMT, AT, ZERO, 6); else { if (mips_opts.micromips) micromips_label_expr (&label_expr); else label_expr.X_add_number = 8; macro_build (&label_expr, "beq", "s,t,p", AT, ZERO); macro_build (NULL, "nop", ""); macro_build (NULL, "break", BRK_FMT, 6); if (mips_opts.micromips) micromips_add_label (); } end_noreorder (); break; case M_DROL: if (ISA_HAS_DROR (mips_opts.isa) || CPU_HAS_DROR (mips_opts.arch)) { if (op[0] == op[1]) { tempreg = AT; used_at = 1; } else tempreg = op[0]; macro_build (NULL, "dnegu", "d,w", tempreg, op[2]); macro_build (NULL, "drorv", "d,t,s", op[0], op[1], tempreg); break; } used_at = 1; macro_build (NULL, "dsubu", "d,v,t", AT, ZERO, op[2]); macro_build (NULL, "dsrlv", "d,t,s", AT, op[1], AT); macro_build (NULL, "dsllv", "d,t,s", op[0], op[1], op[2]); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); break; case M_ROL: if (ISA_HAS_ROR (mips_opts.isa) || CPU_HAS_ROR (mips_opts.arch)) { if (op[0] == op[1]) { tempreg = AT; used_at = 1; } else tempreg = op[0]; macro_build (NULL, "negu", "d,w", tempreg, op[2]); macro_build (NULL, "rorv", "d,t,s", op[0], op[1], tempreg); break; } used_at = 1; macro_build (NULL, "subu", "d,v,t", AT, ZERO, op[2]); macro_build (NULL, "srlv", "d,t,s", AT, op[1], AT); macro_build (NULL, "sllv", "d,t,s", op[0], op[1], op[2]); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); break; case M_DROL_I: { unsigned int rot; const char *l; const char *rr; rot = imm_expr.X_add_number & 0x3f; if (ISA_HAS_DROR (mips_opts.isa) || CPU_HAS_DROR (mips_opts.arch)) { rot = (64 - rot) & 0x3f; if (rot >= 32) macro_build (NULL, "dror32", SHFT_FMT, op[0], op[1], rot - 32); else macro_build (NULL, "dror", SHFT_FMT, op[0], op[1], rot); break; } if (rot == 0) { macro_build (NULL, "dsrl", SHFT_FMT, op[0], op[1], 0); break; } l = (rot < 0x20) ? "dsll" : "dsll32"; rr = ((0x40 - rot) < 0x20) ? "dsrl" : "dsrl32"; rot &= 0x1f; used_at = 1; macro_build (NULL, l, SHFT_FMT, AT, op[1], rot); macro_build (NULL, rr, SHFT_FMT, op[0], op[1], (0x20 - rot) & 0x1f); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); } break; case M_ROL_I: { unsigned int rot; rot = imm_expr.X_add_number & 0x1f; if (ISA_HAS_ROR (mips_opts.isa) || CPU_HAS_ROR (mips_opts.arch)) { macro_build (NULL, "ror", SHFT_FMT, op[0], op[1], (32 - rot) & 0x1f); break; } if (rot == 0) { macro_build (NULL, "srl", SHFT_FMT, op[0], op[1], 0); break; } used_at = 1; macro_build (NULL, "sll", SHFT_FMT, AT, op[1], rot); macro_build (NULL, "srl", SHFT_FMT, op[0], op[1], (0x20 - rot) & 0x1f); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); } break; case M_DROR: if (ISA_HAS_DROR (mips_opts.isa) || CPU_HAS_DROR (mips_opts.arch)) { macro_build (NULL, "drorv", "d,t,s", op[0], op[1], op[2]); break; } used_at = 1; macro_build (NULL, "dsubu", "d,v,t", AT, ZERO, op[2]); macro_build (NULL, "dsllv", "d,t,s", AT, op[1], AT); macro_build (NULL, "dsrlv", "d,t,s", op[0], op[1], op[2]); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); break; case M_ROR: if (ISA_HAS_ROR (mips_opts.isa) || CPU_HAS_ROR (mips_opts.arch)) { macro_build (NULL, "rorv", "d,t,s", op[0], op[1], op[2]); break; } used_at = 1; macro_build (NULL, "subu", "d,v,t", AT, ZERO, op[2]); macro_build (NULL, "sllv", "d,t,s", AT, op[1], AT); macro_build (NULL, "srlv", "d,t,s", op[0], op[1], op[2]); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); break; case M_DROR_I: { unsigned int rot; const char *l; const char *rr; rot = imm_expr.X_add_number & 0x3f; if (ISA_HAS_DROR (mips_opts.isa) || CPU_HAS_DROR (mips_opts.arch)) { if (rot >= 32) macro_build (NULL, "dror32", SHFT_FMT, op[0], op[1], rot - 32); else macro_build (NULL, "dror", SHFT_FMT, op[0], op[1], rot); break; } if (rot == 0) { macro_build (NULL, "dsrl", SHFT_FMT, op[0], op[1], 0); break; } rr = (rot < 0x20) ? "dsrl" : "dsrl32"; l = ((0x40 - rot) < 0x20) ? "dsll" : "dsll32"; rot &= 0x1f; used_at = 1; macro_build (NULL, rr, SHFT_FMT, AT, op[1], rot); macro_build (NULL, l, SHFT_FMT, op[0], op[1], (0x20 - rot) & 0x1f); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); } break; case M_ROR_I: { unsigned int rot; rot = imm_expr.X_add_number & 0x1f; if (ISA_HAS_ROR (mips_opts.isa) || CPU_HAS_ROR (mips_opts.arch)) { macro_build (NULL, "ror", SHFT_FMT, op[0], op[1], rot); break; } if (rot == 0) { macro_build (NULL, "srl", SHFT_FMT, op[0], op[1], 0); break; } used_at = 1; macro_build (NULL, "srl", SHFT_FMT, AT, op[1], rot); macro_build (NULL, "sll", SHFT_FMT, op[0], op[1], (0x20 - rot) & 0x1f); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); } break; case M_SEQ: if (op[1] == 0) macro_build (&expr1, "sltiu", "t,r,j", op[0], op[2], BFD_RELOC_LO16); else if (op[2] == 0) macro_build (&expr1, "sltiu", "t,r,j", op[0], op[1], BFD_RELOC_LO16); else { macro_build (NULL, "xor", "d,v,t", op[0], op[1], op[2]); macro_build (&expr1, "sltiu", "t,r,j", op[0], op[0], BFD_RELOC_LO16); } break; case M_SEQ_I: if (imm_expr.X_add_number == 0) { macro_build (&expr1, "sltiu", "t,r,j", op[0], op[1], BFD_RELOC_LO16); break; } if (op[1] == 0) { as_warn (_("instruction %s: result is always false"), ip->insn_mo->name); move_register (op[0], 0); break; } if (CPU_HAS_SEQ (mips_opts.arch) && -512 <= imm_expr.X_add_number && imm_expr.X_add_number < 512) { macro_build (NULL, "seqi", "t,r,+Q", op[0], op[1], (int) imm_expr.X_add_number); break; } if (imm_expr.X_add_number >= 0 && imm_expr.X_add_number < 0x10000) macro_build (&imm_expr, "xori", "t,r,i", op[0], op[1], BFD_RELOC_LO16); else if (imm_expr.X_add_number > -0x8000 && imm_expr.X_add_number < 0) { imm_expr.X_add_number = -imm_expr.X_add_number; macro_build (&imm_expr, GPR_SIZE == 32 ? "addiu" : "daddiu", "t,r,j", op[0], op[1], BFD_RELOC_LO16); } else if (CPU_HAS_SEQ (mips_opts.arch)) { used_at = 1; load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, "seq", "d,v,t", op[0], op[1], AT); break; } else { load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, "xor", "d,v,t", op[0], op[1], AT); used_at = 1; } macro_build (&expr1, "sltiu", "t,r,j", op[0], op[0], BFD_RELOC_LO16); break; case M_SGE: /* X >= Y <==> not (X < Y) */ s = "slt"; goto sge; case M_SGEU: s = "sltu"; sge: macro_build (NULL, s, "d,v,t", op[0], op[1], op[2]); macro_build (&expr1, "xori", "t,r,i", op[0], op[0], BFD_RELOC_LO16); break; case M_SGE_I: /* X >= I <==> not (X < I) */ case M_SGEU_I: if (imm_expr.X_add_number >= -0x8000 && imm_expr.X_add_number < 0x8000) macro_build (&imm_expr, mask == M_SGE_I ? "slti" : "sltiu", "t,r,j", op[0], op[1], BFD_RELOC_LO16); else { load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, mask == M_SGE_I ? "slt" : "sltu", "d,v,t", op[0], op[1], AT); used_at = 1; } macro_build (&expr1, "xori", "t,r,i", op[0], op[0], BFD_RELOC_LO16); break; case M_SGT: /* X > Y <==> Y < X */ s = "slt"; goto sgt; case M_SGTU: s = "sltu"; sgt: macro_build (NULL, s, "d,v,t", op[0], op[2], op[1]); break; case M_SGT_I: /* X > I <==> I < X */ s = "slt"; goto sgti; case M_SGTU_I: s = "sltu"; sgti: used_at = 1; load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, s, "d,v,t", op[0], AT, op[1]); break; case M_SLE: /* X <= Y <==> Y >= X <==> not (Y < X) */ s = "slt"; goto sle; case M_SLEU: s = "sltu"; sle: macro_build (NULL, s, "d,v,t", op[0], op[2], op[1]); macro_build (&expr1, "xori", "t,r,i", op[0], op[0], BFD_RELOC_LO16); break; case M_SLE_I: /* X <= I <==> I >= X <==> not (I < X) */ s = "slt"; goto slei; case M_SLEU_I: s = "sltu"; slei: used_at = 1; load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, s, "d,v,t", op[0], AT, op[1]); macro_build (&expr1, "xori", "t,r,i", op[0], op[0], BFD_RELOC_LO16); break; case M_SLT_I: if (imm_expr.X_add_number >= -0x8000 && imm_expr.X_add_number < 0x8000) { macro_build (&imm_expr, "slti", "t,r,j", op[0], op[1], BFD_RELOC_LO16); break; } used_at = 1; load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, "slt", "d,v,t", op[0], op[1], AT); break; case M_SLTU_I: if (imm_expr.X_add_number >= -0x8000 && imm_expr.X_add_number < 0x8000) { macro_build (&imm_expr, "sltiu", "t,r,j", op[0], op[1], BFD_RELOC_LO16); break; } used_at = 1; load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, "sltu", "d,v,t", op[0], op[1], AT); break; case M_SNE: if (op[1] == 0) macro_build (NULL, "sltu", "d,v,t", op[0], 0, op[2]); else if (op[2] == 0) macro_build (NULL, "sltu", "d,v,t", op[0], 0, op[1]); else { macro_build (NULL, "xor", "d,v,t", op[0], op[1], op[2]); macro_build (NULL, "sltu", "d,v,t", op[0], 0, op[0]); } break; case M_SNE_I: if (imm_expr.X_add_number == 0) { macro_build (NULL, "sltu", "d,v,t", op[0], 0, op[1]); break; } if (op[1] == 0) { as_warn (_("instruction %s: result is always true"), ip->insn_mo->name); macro_build (&expr1, GPR_SIZE == 32 ? "addiu" : "daddiu", "t,r,j", op[0], 0, BFD_RELOC_LO16); break; } if (CPU_HAS_SEQ (mips_opts.arch) && -512 <= imm_expr.X_add_number && imm_expr.X_add_number < 512) { macro_build (NULL, "snei", "t,r,+Q", op[0], op[1], (int) imm_expr.X_add_number); break; } if (imm_expr.X_add_number >= 0 && imm_expr.X_add_number < 0x10000) { macro_build (&imm_expr, "xori", "t,r,i", op[0], op[1], BFD_RELOC_LO16); } else if (imm_expr.X_add_number > -0x8000 && imm_expr.X_add_number < 0) { imm_expr.X_add_number = -imm_expr.X_add_number; macro_build (&imm_expr, GPR_SIZE == 32 ? "addiu" : "daddiu", "t,r,j", op[0], op[1], BFD_RELOC_LO16); } else if (CPU_HAS_SEQ (mips_opts.arch)) { used_at = 1; load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, "sne", "d,v,t", op[0], op[1], AT); break; } else { load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, "xor", "d,v,t", op[0], op[1], AT); used_at = 1; } macro_build (NULL, "sltu", "d,v,t", op[0], 0, op[0]); break; case M_SUB_I: s = "addi"; s2 = "sub"; goto do_subi; case M_SUBU_I: s = "addiu"; s2 = "subu"; goto do_subi; case M_DSUB_I: dbl = 1; s = "daddi"; s2 = "dsub"; if (!mips_opts.micromips) goto do_subi; if (imm_expr.X_add_number > -0x200 && imm_expr.X_add_number <= 0x200) { macro_build (NULL, s, "t,r,.", op[0], op[1], (int) -imm_expr.X_add_number); break; } goto do_subi_i; case M_DSUBU_I: dbl = 1; s = "daddiu"; s2 = "dsubu"; do_subi: if (imm_expr.X_add_number > -0x8000 && imm_expr.X_add_number <= 0x8000) { imm_expr.X_add_number = -imm_expr.X_add_number; macro_build (&imm_expr, s, "t,r,j", op[0], op[1], BFD_RELOC_LO16); break; } do_subi_i: used_at = 1; load_register (AT, &imm_expr, dbl); macro_build (NULL, s2, "d,v,t", op[0], op[1], AT); break; case M_TEQ_I: s = "teq"; goto trap; case M_TGE_I: s = "tge"; goto trap; case M_TGEU_I: s = "tgeu"; goto trap; case M_TLT_I: s = "tlt"; goto trap; case M_TLTU_I: s = "tltu"; goto trap; case M_TNE_I: s = "tne"; trap: used_at = 1; load_register (AT, &imm_expr, GPR_SIZE == 64); macro_build (NULL, s, "s,t", op[0], AT); break; case M_TRUNCWS: case M_TRUNCWD: gas_assert (!mips_opts.micromips); gas_assert (mips_opts.isa == ISA_MIPS1); used_at = 1; /* * Is the double cfc1 instruction a bug in the mips assembler; * or is there a reason for it? */ start_noreorder (); macro_build (NULL, "cfc1", "t,G", op[2], RA); macro_build (NULL, "cfc1", "t,G", op[2], RA); macro_build (NULL, "nop", ""); expr1.X_add_number = 3; macro_build (&expr1, "ori", "t,r,i", AT, op[2], BFD_RELOC_LO16); expr1.X_add_number = 2; macro_build (&expr1, "xori", "t,r,i", AT, AT, BFD_RELOC_LO16); macro_build (NULL, "ctc1", "t,G", AT, RA); macro_build (NULL, "nop", ""); macro_build (NULL, mask == M_TRUNCWD ? "cvt.w.d" : "cvt.w.s", "D,S", op[0], op[1]); macro_build (NULL, "ctc1", "t,G", op[2], RA); macro_build (NULL, "nop", ""); end_noreorder (); break; case M_ULH_AB: s = "lb"; s2 = "lbu"; off = 1; goto uld_st; case M_ULHU_AB: s = "lbu"; s2 = "lbu"; off = 1; goto uld_st; case M_ULW_AB: s = "lwl"; s2 = "lwr"; offbits = (mips_opts.micromips ? 12 : 16); off = 3; goto uld_st; case M_ULD_AB: s = "ldl"; s2 = "ldr"; offbits = (mips_opts.micromips ? 12 : 16); off = 7; goto uld_st; case M_USH_AB: s = "sb"; s2 = "sb"; off = 1; ust = 1; goto uld_st; case M_USW_AB: s = "swl"; s2 = "swr"; offbits = (mips_opts.micromips ? 12 : 16); off = 3; ust = 1; goto uld_st; case M_USD_AB: s = "sdl"; s2 = "sdr"; offbits = (mips_opts.micromips ? 12 : 16); off = 7; ust = 1; uld_st: breg = op[2]; large_offset = !small_offset_p (off, align, offbits); ep = &offset_expr; expr1.X_add_number = 0; if (large_offset) { used_at = 1; tempreg = AT; if (small_offset_p (0, align, 16)) macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", tempreg, breg, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2]); else { load_address (tempreg, ep, &used_at); if (breg != 0) macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg, breg); } offset_reloc[0] = BFD_RELOC_LO16; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; breg = tempreg; tempreg = op[0]; ep = &expr1; } else if (!ust && op[0] == breg) { used_at = 1; tempreg = AT; } else tempreg = op[0]; if (off == 1) goto ulh_sh; if (!target_big_endian) ep->X_add_number += off; if (offbits == 12) macro_build (NULL, s, "t,~(b)", tempreg, (int) ep->X_add_number, breg); else macro_build (ep, s, "t,o(b)", tempreg, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); if (!target_big_endian) ep->X_add_number -= off; else ep->X_add_number += off; if (offbits == 12) macro_build (NULL, s2, "t,~(b)", tempreg, (int) ep->X_add_number, breg); else macro_build (ep, s2, "t,o(b)", tempreg, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); /* If necessary, move the result in tempreg to the final destination. */ if (!ust && op[0] != tempreg) { /* Protect second load's delay slot. */ load_delay_nop (); move_register (op[0], tempreg); } break; ulh_sh: used_at = 1; if (target_big_endian == ust) ep->X_add_number += off; tempreg = ust || large_offset ? op[0] : AT; macro_build (ep, s, "t,o(b)", tempreg, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); /* For halfword transfers we need a temporary register to shuffle bytes. Unfortunately for M_USH_A we have none available before the next store as AT holds the base address. We deal with this case by clobbering TREG and then restoring it as with ULH. */ tempreg = ust == large_offset ? op[0] : AT; if (ust) macro_build (NULL, "srl", SHFT_FMT, tempreg, op[0], 8); if (target_big_endian == ust) ep->X_add_number -= off; else ep->X_add_number += off; macro_build (ep, s2, "t,o(b)", tempreg, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], breg); /* For M_USH_A re-retrieve the LSB. */ if (ust && large_offset) { if (target_big_endian) ep->X_add_number += off; else ep->X_add_number -= off; macro_build (&expr1, "lbu", "t,o(b)", AT, -1, offset_reloc[0], offset_reloc[1], offset_reloc[2], AT); } /* For ULH and M_USH_A OR the LSB in. */ if (!ust || large_offset) { tempreg = !large_offset ? AT : op[0]; macro_build (NULL, "sll", SHFT_FMT, tempreg, tempreg, 8); macro_build (NULL, "or", "d,v,t", op[0], op[0], AT); } break; default: /* FIXME: Check if this is one of the itbl macros, since they are added dynamically. */ as_bad (_("macro %s not implemented yet"), ip->insn_mo->name); break; } if (!mips_opts.at && used_at) as_bad (_("macro used $at after \".set noat\"")); } /* Implement macros in mips16 mode. */ static void mips16_macro (struct mips_cl_insn *ip) { const struct mips_operand_array *operands; int mask; int tmp; expressionS expr1; int dbl; const char *s, *s2, *s3; unsigned int op[MAX_OPERANDS]; unsigned int i; mask = ip->insn_mo->mask; operands = insn_operands (ip); for (i = 0; i < MAX_OPERANDS; i++) if (operands->operand[i]) op[i] = insn_extract_operand (ip, operands->operand[i]); else op[i] = -1; expr1.X_op = O_constant; expr1.X_op_symbol = NULL; expr1.X_add_symbol = NULL; expr1.X_add_number = 1; dbl = 0; switch (mask) { default: abort (); case M_DDIV_3: dbl = 1; /* Fall through. */ case M_DIV_3: s = "mflo"; goto do_div3; case M_DREM_3: dbl = 1; /* Fall through. */ case M_REM_3: s = "mfhi"; do_div3: start_noreorder (); macro_build (NULL, dbl ? "ddiv" : "div", "0,x,y", op[1], op[2]); expr1.X_add_number = 2; macro_build (&expr1, "bnez", "x,p", op[2]); macro_build (NULL, "break", "6", 7); /* FIXME: The normal code checks for of -1 / -0x80000000 here, since that causes an overflow. We should do that as well, but I don't see how to do the comparisons without a temporary register. */ end_noreorder (); macro_build (NULL, s, "x", op[0]); break; case M_DIVU_3: s = "divu"; s2 = "mflo"; goto do_divu3; case M_REMU_3: s = "divu"; s2 = "mfhi"; goto do_divu3; case M_DDIVU_3: s = "ddivu"; s2 = "mflo"; goto do_divu3; case M_DREMU_3: s = "ddivu"; s2 = "mfhi"; do_divu3: start_noreorder (); macro_build (NULL, s, "0,x,y", op[1], op[2]); expr1.X_add_number = 2; macro_build (&expr1, "bnez", "x,p", op[2]); macro_build (NULL, "break", "6", 7); end_noreorder (); macro_build (NULL, s2, "x", op[0]); break; case M_DMUL: dbl = 1; /* Fall through. */ case M_MUL: macro_build (NULL, dbl ? "dmultu" : "multu", "x,y", op[1], op[2]); macro_build (NULL, "mflo", "x", op[0]); break; case M_DSUBU_I: dbl = 1; goto do_subu; case M_SUBU_I: do_subu: imm_expr.X_add_number = -imm_expr.X_add_number; macro_build (&imm_expr, dbl ? "daddiu" : "addiu", "y,x,4", op[0], op[1]); break; case M_SUBU_I_2: imm_expr.X_add_number = -imm_expr.X_add_number; macro_build (&imm_expr, "addiu", "x,k", op[0]); break; case M_DSUBU_I_2: imm_expr.X_add_number = -imm_expr.X_add_number; macro_build (&imm_expr, "daddiu", "y,j", op[0]); break; case M_BEQ: s = "cmp"; s2 = "bteqz"; goto do_branch; case M_BNE: s = "cmp"; s2 = "btnez"; goto do_branch; case M_BLT: s = "slt"; s2 = "btnez"; goto do_branch; case M_BLTU: s = "sltu"; s2 = "btnez"; goto do_branch; case M_BLE: s = "slt"; s2 = "bteqz"; goto do_reverse_branch; case M_BLEU: s = "sltu"; s2 = "bteqz"; goto do_reverse_branch; case M_BGE: s = "slt"; s2 = "bteqz"; goto do_branch; case M_BGEU: s = "sltu"; s2 = "bteqz"; goto do_branch; case M_BGT: s = "slt"; s2 = "btnez"; goto do_reverse_branch; case M_BGTU: s = "sltu"; s2 = "btnez"; do_reverse_branch: tmp = op[1]; op[1] = op[0]; op[0] = tmp; do_branch: macro_build (NULL, s, "x,y", op[0], op[1]); macro_build (&offset_expr, s2, "p"); break; case M_BEQ_I: s = "cmpi"; s2 = "bteqz"; s3 = "x,U"; goto do_branch_i; case M_BNE_I: s = "cmpi"; s2 = "btnez"; s3 = "x,U"; goto do_branch_i; case M_BLT_I: s = "slti"; s2 = "btnez"; s3 = "x,8"; goto do_branch_i; case M_BLTU_I: s = "sltiu"; s2 = "btnez"; s3 = "x,8"; goto do_branch_i; case M_BLE_I: s = "slti"; s2 = "btnez"; s3 = "x,8"; goto do_addone_branch_i; case M_BLEU_I: s = "sltiu"; s2 = "btnez"; s3 = "x,8"; goto do_addone_branch_i; case M_BGE_I: s = "slti"; s2 = "bteqz"; s3 = "x,8"; goto do_branch_i; case M_BGEU_I: s = "sltiu"; s2 = "bteqz"; s3 = "x,8"; goto do_branch_i; case M_BGT_I: s = "slti"; s2 = "bteqz"; s3 = "x,8"; goto do_addone_branch_i; case M_BGTU_I: s = "sltiu"; s2 = "bteqz"; s3 = "x,8"; do_addone_branch_i: ++imm_expr.X_add_number; do_branch_i: macro_build (&imm_expr, s, s3, op[0]); macro_build (&offset_expr, s2, "p"); break; case M_ABS: expr1.X_add_number = 0; macro_build (&expr1, "slti", "x,8", op[1]); if (op[0] != op[1]) macro_build (NULL, "move", "y,X", op[0], mips16_to_32_reg_map[op[1]]); expr1.X_add_number = 2; macro_build (&expr1, "bteqz", "p"); macro_build (NULL, "neg", "x,w", op[0], op[0]); break; } } /* Look up instruction [START, START + LENGTH) in HASH. Record any extra opcode bits in *OPCODE_EXTRA. */ static struct mips_opcode * mips_lookup_insn (struct hash_control *hash, const char *start, ssize_t length, unsigned int *opcode_extra) { char *name, *dot, *p; unsigned int mask, suffix; ssize_t opend; struct mips_opcode *insn; /* Make a copy of the instruction so that we can fiddle with it. */ name = xstrndup (start, length); /* Look up the instruction as-is. */ insn = (struct mips_opcode *) hash_find (hash, name); if (insn) goto end; dot = strchr (name, '.'); if (dot && dot[1]) { /* Try to interpret the text after the dot as a VU0 channel suffix. */ p = mips_parse_vu0_channels (dot + 1, &mask); if (*p == 0 && mask != 0) { *dot = 0; insn = (struct mips_opcode *) hash_find (hash, name); *dot = '.'; if (insn && (insn->pinfo2 & INSN2_VU0_CHANNEL_SUFFIX) != 0) { *opcode_extra |= mask << mips_vu0_channel_mask.lsb; goto end; } } } if (mips_opts.micromips) { /* See if there's an instruction size override suffix, either `16' or `32', at the end of the mnemonic proper, that defines the operation, i.e. before the first `.' character if any. Strip it and retry. */ opend = dot != NULL ? dot - name : length; if (opend >= 3 && name[opend - 2] == '1' && name[opend - 1] == '6') suffix = 2; else if (name[opend - 2] == '3' && name[opend - 1] == '2') suffix = 4; else suffix = 0; if (suffix) { memcpy (name + opend - 2, name + opend, length - opend + 1); insn = (struct mips_opcode *) hash_find (hash, name); if (insn) { forced_insn_length = suffix; goto end; } } } insn = NULL; end: free (name); return insn; } /* Assemble an instruction into its binary format. If the instruction is a macro, set imm_expr and offset_expr to the values associated with "I" and "A" operands respectively. Otherwise store the value of the relocatable field (if any) in offset_expr. In both cases set offset_reloc to the relocation operators applied to offset_expr. */ static void mips_ip (char *str, struct mips_cl_insn *insn) { const struct mips_opcode *first, *past; struct hash_control *hash; char format; size_t end; struct mips_operand_token *tokens; unsigned int opcode_extra; if (mips_opts.micromips) { hash = micromips_op_hash; past = &micromips_opcodes[bfd_micromips_num_opcodes]; } else { hash = op_hash; past = &mips_opcodes[NUMOPCODES]; } forced_insn_length = 0; opcode_extra = 0; /* We first try to match an instruction up to a space or to the end. */ for (end = 0; str[end] != '\0' && !ISSPACE (str[end]); end++) continue; first = mips_lookup_insn (hash, str, end, &opcode_extra); if (first == NULL) { set_insn_error (0, _("unrecognized opcode")); return; } if (strcmp (first->name, "li.s") == 0) format = 'f'; else if (strcmp (first->name, "li.d") == 0) format = 'd'; else format = 0; tokens = mips_parse_arguments (str + end, format); if (!tokens) return; if (!match_insns (insn, first, past, tokens, opcode_extra, FALSE) && !match_insns (insn, first, past, tokens, opcode_extra, TRUE)) set_insn_error (0, _("invalid operands")); obstack_free (&mips_operand_tokens, tokens); } /* As for mips_ip, but used when assembling MIPS16 code. Also set forced_insn_length to the resulting instruction size in bytes if the user explicitly requested a small or extended instruction. */ static void mips16_ip (char *str, struct mips_cl_insn *insn) { char *end, *s, c; struct mips_opcode *first; struct mips_operand_token *tokens; forced_insn_length = 0; for (s = str; ISLOWER (*s); ++s) ; end = s; c = *end; switch (c) { case '\0': break; case ' ': s++; break; case '.': if (s[1] == 't' && s[2] == ' ') { forced_insn_length = 2; s += 3; break; } else if (s[1] == 'e' && s[2] == ' ') { forced_insn_length = 4; s += 3; break; } /* Fall through. */ default: set_insn_error (0, _("unrecognized opcode")); return; } *end = 0; first = (struct mips_opcode *) hash_find (mips16_op_hash, str); *end = c; if (!first) { set_insn_error (0, _("unrecognized opcode")); return; } tokens = mips_parse_arguments (s, 0); if (!tokens) return; if (!match_mips16_insns (insn, first, tokens)) set_insn_error (0, _("invalid operands")); obstack_free (&mips_operand_tokens, tokens); } /* Marshal immediate value VAL for an extended MIPS16 instruction. NBITS is the number of significant bits in VAL. */ static unsigned long mips16_immed_extend (offsetT val, unsigned int nbits) { int extval; if (nbits == 16) { extval = ((val >> 11) & 0x1f) | (val & 0x7e0); val &= 0x1f; } else if (nbits == 15) { extval = ((val >> 11) & 0xf) | (val & 0x7f0); val &= 0xf; } else { extval = ((val & 0x1f) << 6) | (val & 0x20); val = 0; } return (extval << 16) | val; } /* Like decode_mips16_operand, but require the operand to be defined and require it to be an integer. */ static const struct mips_int_operand * mips16_immed_operand (int type, bfd_boolean extended_p) { const struct mips_operand *operand; operand = decode_mips16_operand (type, extended_p); if (!operand || (operand->type != OP_INT && operand->type != OP_PCREL)) abort (); return (const struct mips_int_operand *) operand; } /* Return true if SVAL fits OPERAND. RELOC is as for mips16_immed. */ static bfd_boolean mips16_immed_in_range_p (const struct mips_int_operand *operand, bfd_reloc_code_real_type reloc, offsetT sval) { int min_val, max_val; min_val = mips_int_operand_min (operand); max_val = mips_int_operand_max (operand); if (reloc != BFD_RELOC_UNUSED) { if (min_val < 0) sval = SEXT_16BIT (sval); else sval &= 0xffff; } return (sval >= min_val && sval <= max_val && (sval & ((1 << operand->shift) - 1)) == 0); } /* Install immediate value VAL into MIPS16 instruction *INSN, extending it if necessary. The instruction in *INSN may already be extended. RELOC is the relocation that produced VAL, or BFD_RELOC_UNUSED if none. In the former case, VAL is a 16-bit number with no defined signedness. TYPE is the type of the immediate field. USER_INSN_LENGTH is the length that the user requested, or 0 if none. */ static void mips16_immed (const char *file, unsigned int line, int type, bfd_reloc_code_real_type reloc, offsetT val, unsigned int user_insn_length, unsigned long *insn) { const struct mips_int_operand *operand; unsigned int uval, length; operand = mips16_immed_operand (type, FALSE); if (!mips16_immed_in_range_p (operand, reloc, val)) { /* We need an extended instruction. */ if (user_insn_length == 2) as_bad_where (file, line, _("invalid unextended operand value")); else *insn |= MIPS16_EXTEND; } else if (user_insn_length == 4) { /* The operand doesn't force an unextended instruction to be extended. Warn if the user wanted an extended instruction anyway. */ *insn |= MIPS16_EXTEND; as_warn_where (file, line, _("extended operand requested but not required")); } length = mips16_opcode_length (*insn); if (length == 4) { operand = mips16_immed_operand (type, TRUE); if (!mips16_immed_in_range_p (operand, reloc, val)) as_bad_where (file, line, _("operand value out of range for instruction")); } uval = ((unsigned int) val >> operand->shift) - operand->bias; if (length == 2) *insn = mips_insert_operand (&operand->root, *insn, uval); else *insn |= mips16_immed_extend (uval, operand->root.size); } struct percent_op_match { const char *str; bfd_reloc_code_real_type reloc; }; static const struct percent_op_match mips_percent_op[] = { {"%lo", BFD_RELOC_LO16}, {"%call_hi", BFD_RELOC_MIPS_CALL_HI16}, {"%call_lo", BFD_RELOC_MIPS_CALL_LO16}, {"%call16", BFD_RELOC_MIPS_CALL16}, {"%got_disp", BFD_RELOC_MIPS_GOT_DISP}, {"%got_page", BFD_RELOC_MIPS_GOT_PAGE}, {"%got_ofst", BFD_RELOC_MIPS_GOT_OFST}, {"%got_hi", BFD_RELOC_MIPS_GOT_HI16}, {"%got_lo", BFD_RELOC_MIPS_GOT_LO16}, {"%got", BFD_RELOC_MIPS_GOT16}, {"%gp_rel", BFD_RELOC_GPREL16}, {"%half", BFD_RELOC_16}, {"%highest", BFD_RELOC_MIPS_HIGHEST}, {"%higher", BFD_RELOC_MIPS_HIGHER}, {"%neg", BFD_RELOC_MIPS_SUB}, {"%tlsgd", BFD_RELOC_MIPS_TLS_GD}, {"%tlsldm", BFD_RELOC_MIPS_TLS_LDM}, {"%dtprel_hi", BFD_RELOC_MIPS_TLS_DTPREL_HI16}, {"%dtprel_lo", BFD_RELOC_MIPS_TLS_DTPREL_LO16}, {"%tprel_hi", BFD_RELOC_MIPS_TLS_TPREL_HI16}, {"%tprel_lo", BFD_RELOC_MIPS_TLS_TPREL_LO16}, {"%gottprel", BFD_RELOC_MIPS_TLS_GOTTPREL}, {"%hi", BFD_RELOC_HI16_S}, {"%pcrel_hi", BFD_RELOC_HI16_S_PCREL}, {"%pcrel_lo", BFD_RELOC_LO16_PCREL} }; static const struct percent_op_match mips16_percent_op[] = { {"%lo", BFD_RELOC_MIPS16_LO16}, {"%gprel", BFD_RELOC_MIPS16_GPREL}, {"%got", BFD_RELOC_MIPS16_GOT16}, {"%call16", BFD_RELOC_MIPS16_CALL16}, {"%hi", BFD_RELOC_MIPS16_HI16_S}, {"%tlsgd", BFD_RELOC_MIPS16_TLS_GD}, {"%tlsldm", BFD_RELOC_MIPS16_TLS_LDM}, {"%dtprel_hi", BFD_RELOC_MIPS16_TLS_DTPREL_HI16}, {"%dtprel_lo", BFD_RELOC_MIPS16_TLS_DTPREL_LO16}, {"%tprel_hi", BFD_RELOC_MIPS16_TLS_TPREL_HI16}, {"%tprel_lo", BFD_RELOC_MIPS16_TLS_TPREL_LO16}, {"%gottprel", BFD_RELOC_MIPS16_TLS_GOTTPREL} }; /* Return true if *STR points to a relocation operator. When returning true, move *STR over the operator and store its relocation code in *RELOC. Leave both *STR and *RELOC alone when returning false. */ static bfd_boolean parse_relocation (char **str, bfd_reloc_code_real_type *reloc) { const struct percent_op_match *percent_op; size_t limit, i; if (mips_opts.mips16) { percent_op = mips16_percent_op; limit = ARRAY_SIZE (mips16_percent_op); } else { percent_op = mips_percent_op; limit = ARRAY_SIZE (mips_percent_op); } for (i = 0; i < limit; i++) if (strncasecmp (*str, percent_op[i].str, strlen (percent_op[i].str)) == 0) { int len = strlen (percent_op[i].str); if (!ISSPACE ((*str)[len]) && (*str)[len] != '(') continue; *str += strlen (percent_op[i].str); *reloc = percent_op[i].reloc; /* Check whether the output BFD supports this relocation. If not, issue an error and fall back on something safe. */ if (!bfd_reloc_type_lookup (stdoutput, percent_op[i].reloc)) { as_bad (_("relocation %s isn't supported by the current ABI"), percent_op[i].str); *reloc = BFD_RELOC_UNUSED; } return TRUE; } return FALSE; } /* Parse string STR as a 16-bit relocatable operand. Store the expression in *EP and the relocations in the array starting at RELOC. Return the number of relocation operators used. On exit, EXPR_END points to the first character after the expression. */ static size_t my_getSmallExpression (expressionS *ep, bfd_reloc_code_real_type *reloc, char *str) { bfd_reloc_code_real_type reversed_reloc[3]; size_t reloc_index, i; int crux_depth, str_depth; char *crux; /* Search for the start of the main expression, recoding relocations in REVERSED_RELOC. End the loop with CRUX pointing to the start of the main expression and with CRUX_DEPTH containing the number of open brackets at that point. */ reloc_index = -1; str_depth = 0; do { reloc_index++; crux = str; crux_depth = str_depth; /* Skip over whitespace and brackets, keeping count of the number of brackets. */ while (*str == ' ' || *str == '\t' || *str == '(') if (*str++ == '(') str_depth++; } while (*str == '%' && reloc_index < (HAVE_NEWABI ? 3 : 1) && parse_relocation (&str, &reversed_reloc[reloc_index])); my_getExpression (ep, crux); str = expr_end; /* Match every open bracket. */ while (crux_depth > 0 && (*str == ')' || *str == ' ' || *str == '\t')) if (*str++ == ')') crux_depth--; if (crux_depth > 0) as_bad (_("unclosed '('")); expr_end = str; if (reloc_index != 0) { prev_reloc_op_frag = frag_now; for (i = 0; i < reloc_index; i++) reloc[i] = reversed_reloc[reloc_index - 1 - i]; } return reloc_index; } static void my_getExpression (expressionS *ep, char *str) { char *save_in; save_in = input_line_pointer; input_line_pointer = str; expression (ep); expr_end = input_line_pointer; input_line_pointer = save_in; } const char * md_atof (int type, char *litP, int *sizeP) { return ieee_md_atof (type, litP, sizeP, target_big_endian); } void md_number_to_chars (char *buf, valueT val, int n) { if (target_big_endian) number_to_chars_bigendian (buf, val, n); else number_to_chars_littleendian (buf, val, n); } static int support_64bit_objects(void) { const char **list, **l; int yes; list = bfd_target_list (); for (l = list; *l != NULL; l++) if (strcmp (*l, ELF_TARGET ("elf64-", "big")) == 0 || strcmp (*l, ELF_TARGET ("elf64-", "little")) == 0) break; yes = (*l != NULL); free (list); return yes; } /* Set STRING_PTR (either &mips_arch_string or &mips_tune_string) to NEW_VALUE. Warn if another value was already specified. Note: we have to defer parsing the -march and -mtune arguments in order to handle 'from-abi' correctly, since the ABI might be specified in a later argument. */ static void mips_set_option_string (const char **string_ptr, const char *new_value) { if (*string_ptr != 0 && strcasecmp (*string_ptr, new_value) != 0) as_warn (_("a different %s was already specified, is now %s"), string_ptr == &mips_arch_string ? "-march" : "-mtune", new_value); *string_ptr = new_value; } int md_parse_option (int c, const char *arg) { unsigned int i; for (i = 0; i < ARRAY_SIZE (mips_ases); i++) if (c == mips_ases[i].option_on || c == mips_ases[i].option_off) { file_ase_explicit |= mips_set_ase (&mips_ases[i], &file_mips_opts, c == mips_ases[i].option_on); return 1; } switch (c) { case OPTION_CONSTRUCT_FLOATS: mips_disable_float_construction = 0; break; case OPTION_NO_CONSTRUCT_FLOATS: mips_disable_float_construction = 1; break; case OPTION_TRAP: mips_trap = 1; break; case OPTION_BREAK: mips_trap = 0; break; case OPTION_EB: target_big_endian = 1; break; case OPTION_EL: target_big_endian = 0; break; case 'O': if (arg == NULL) mips_optimize = 1; else if (arg[0] == '0') mips_optimize = 0; else if (arg[0] == '1') mips_optimize = 1; else mips_optimize = 2; break; case 'g': if (arg == NULL) mips_debug = 2; else mips_debug = atoi (arg); break; case OPTION_MIPS1: file_mips_opts.isa = ISA_MIPS1; break; case OPTION_MIPS2: file_mips_opts.isa = ISA_MIPS2; break; case OPTION_MIPS3: file_mips_opts.isa = ISA_MIPS3; break; case OPTION_MIPS4: file_mips_opts.isa = ISA_MIPS4; break; case OPTION_MIPS5: file_mips_opts.isa = ISA_MIPS5; break; case OPTION_MIPS32: file_mips_opts.isa = ISA_MIPS32; break; case OPTION_MIPS32R2: file_mips_opts.isa = ISA_MIPS32R2; break; case OPTION_MIPS32R3: file_mips_opts.isa = ISA_MIPS32R3; break; case OPTION_MIPS32R5: file_mips_opts.isa = ISA_MIPS32R5; break; case OPTION_MIPS32R6: file_mips_opts.isa = ISA_MIPS32R6; break; case OPTION_MIPS64R2: file_mips_opts.isa = ISA_MIPS64R2; break; case OPTION_MIPS64R3: file_mips_opts.isa = ISA_MIPS64R3; break; case OPTION_MIPS64R5: file_mips_opts.isa = ISA_MIPS64R5; break; case OPTION_MIPS64R6: file_mips_opts.isa = ISA_MIPS64R6; break; case OPTION_MIPS64: file_mips_opts.isa = ISA_MIPS64; break; case OPTION_MTUNE: mips_set_option_string (&mips_tune_string, arg); break; case OPTION_MARCH: mips_set_option_string (&mips_arch_string, arg); break; case OPTION_M4650: mips_set_option_string (&mips_arch_string, "4650"); mips_set_option_string (&mips_tune_string, "4650"); break; case OPTION_NO_M4650: break; case OPTION_M4010: mips_set_option_string (&mips_arch_string, "4010"); mips_set_option_string (&mips_tune_string, "4010"); break; case OPTION_NO_M4010: break; case OPTION_M4100: mips_set_option_string (&mips_arch_string, "4100"); mips_set_option_string (&mips_tune_string, "4100"); break; case OPTION_NO_M4100: break; case OPTION_M3900: mips_set_option_string (&mips_arch_string, "3900"); mips_set_option_string (&mips_tune_string, "3900"); break; case OPTION_NO_M3900: break; case OPTION_MICROMIPS: if (file_mips_opts.mips16 == 1) { as_bad (_("-mmicromips cannot be used with -mips16")); return 0; } file_mips_opts.micromips = 1; mips_no_prev_insn (); break; case OPTION_NO_MICROMIPS: file_mips_opts.micromips = 0; mips_no_prev_insn (); break; case OPTION_MIPS16: if (file_mips_opts.micromips == 1) { as_bad (_("-mips16 cannot be used with -micromips")); return 0; } file_mips_opts.mips16 = 1; mips_no_prev_insn (); break; case OPTION_NO_MIPS16: file_mips_opts.mips16 = 0; mips_no_prev_insn (); break; case OPTION_FIX_24K: mips_fix_24k = 1; break; case OPTION_NO_FIX_24K: mips_fix_24k = 0; break; case OPTION_FIX_RM7000: mips_fix_rm7000 = 1; break; case OPTION_NO_FIX_RM7000: mips_fix_rm7000 = 0; break; case OPTION_FIX_LOONGSON2F_JUMP: mips_fix_loongson2f_jump = TRUE; break; case OPTION_NO_FIX_LOONGSON2F_JUMP: mips_fix_loongson2f_jump = FALSE; break; case OPTION_FIX_LOONGSON2F_NOP: mips_fix_loongson2f_nop = TRUE; break; case OPTION_NO_FIX_LOONGSON2F_NOP: mips_fix_loongson2f_nop = FALSE; break; case OPTION_FIX_VR4120: mips_fix_vr4120 = 1; break; case OPTION_NO_FIX_VR4120: mips_fix_vr4120 = 0; break; case OPTION_FIX_VR4130: mips_fix_vr4130 = 1; break; case OPTION_NO_FIX_VR4130: mips_fix_vr4130 = 0; break; case OPTION_FIX_CN63XXP1: mips_fix_cn63xxp1 = TRUE; break; case OPTION_NO_FIX_CN63XXP1: mips_fix_cn63xxp1 = FALSE; break; case OPTION_RELAX_BRANCH: mips_relax_branch = 1; break; case OPTION_NO_RELAX_BRANCH: mips_relax_branch = 0; break; case OPTION_INSN32: file_mips_opts.insn32 = TRUE; break; case OPTION_NO_INSN32: file_mips_opts.insn32 = FALSE; break; case OPTION_MSHARED: mips_in_shared = TRUE; break; case OPTION_MNO_SHARED: mips_in_shared = FALSE; break; case OPTION_MSYM32: file_mips_opts.sym32 = TRUE; break; case OPTION_MNO_SYM32: file_mips_opts.sym32 = FALSE; break; /* When generating ELF code, we permit -KPIC and -call_shared to select SVR4_PIC, and -non_shared to select no PIC. This is intended to be compatible with Irix 5. */ case OPTION_CALL_SHARED: mips_pic = SVR4_PIC; mips_abicalls = TRUE; break; case OPTION_CALL_NONPIC: mips_pic = NO_PIC; mips_abicalls = TRUE; break; case OPTION_NON_SHARED: mips_pic = NO_PIC; mips_abicalls = FALSE; break; /* The -xgot option tells the assembler to use 32 bit offsets when accessing the got in SVR4_PIC mode. It is for Irix compatibility. */ case OPTION_XGOT: mips_big_got = 1; break; case 'G': g_switch_value = atoi (arg); g_switch_seen = 1; break; /* The -32, -n32 and -64 options are shortcuts for -mabi=32, -mabi=n32 and -mabi=64. */ case OPTION_32: mips_abi = O32_ABI; break; case OPTION_N32: mips_abi = N32_ABI; break; case OPTION_64: mips_abi = N64_ABI; if (!support_64bit_objects()) as_fatal (_("no compiled in support for 64 bit object file format")); break; case OPTION_GP32: file_mips_opts.gp = 32; break; case OPTION_GP64: file_mips_opts.gp = 64; break; case OPTION_FP32: file_mips_opts.fp = 32; break; case OPTION_FPXX: file_mips_opts.fp = 0; break; case OPTION_FP64: file_mips_opts.fp = 64; break; case OPTION_ODD_SPREG: file_mips_opts.oddspreg = 1; break; case OPTION_NO_ODD_SPREG: file_mips_opts.oddspreg = 0; break; case OPTION_SINGLE_FLOAT: file_mips_opts.single_float = 1; break; case OPTION_DOUBLE_FLOAT: file_mips_opts.single_float = 0; break; case OPTION_SOFT_FLOAT: file_mips_opts.soft_float = 1; break; case OPTION_HARD_FLOAT: file_mips_opts.soft_float = 0; break; case OPTION_MABI: if (strcmp (arg, "32") == 0) mips_abi = O32_ABI; else if (strcmp (arg, "o64") == 0) mips_abi = O64_ABI; else if (strcmp (arg, "n32") == 0) mips_abi = N32_ABI; else if (strcmp (arg, "64") == 0) { mips_abi = N64_ABI; if (! support_64bit_objects()) as_fatal (_("no compiled in support for 64 bit object file " "format")); } else if (strcmp (arg, "eabi") == 0) mips_abi = EABI_ABI; else { as_fatal (_("invalid abi -mabi=%s"), arg); return 0; } break; case OPTION_M7000_HILO_FIX: mips_7000_hilo_fix = TRUE; break; case OPTION_MNO_7000_HILO_FIX: mips_7000_hilo_fix = FALSE; break; case OPTION_MDEBUG: mips_flag_mdebug = TRUE; break; case OPTION_NO_MDEBUG: mips_flag_mdebug = FALSE; break; case OPTION_PDR: mips_flag_pdr = TRUE; break; case OPTION_NO_PDR: mips_flag_pdr = FALSE; break; case OPTION_MVXWORKS_PIC: mips_pic = VXWORKS_PIC; break; case OPTION_NAN: if (strcmp (arg, "2008") == 0) mips_nan2008 = 1; else if (strcmp (arg, "legacy") == 0) mips_nan2008 = 0; else { as_fatal (_("invalid NaN setting -mnan=%s"), arg); return 0; } break; default: return 0; } mips_fix_loongson2f = mips_fix_loongson2f_nop || mips_fix_loongson2f_jump; return 1; } /* Set up globals to tune for the ISA or processor described by INFO. */ static void mips_set_tune (const struct mips_cpu_info *info) { if (info != 0) mips_tune = info->cpu; } void mips_after_parse_args (void) { const struct mips_cpu_info *arch_info = 0; const struct mips_cpu_info *tune_info = 0; /* GP relative stuff not working for PE */ if (strncmp (TARGET_OS, "pe", 2) == 0) { if (g_switch_seen && g_switch_value != 0) as_bad (_("-G not supported in this configuration")); g_switch_value = 0; } if (mips_abi == NO_ABI) mips_abi = MIPS_DEFAULT_ABI; /* The following code determines the architecture. Similar code was added to GCC 3.3 (see override_options() in config/mips/mips.c). The GAS and GCC code should be kept in sync as much as possible. */ if (mips_arch_string != 0) arch_info = mips_parse_cpu ("-march", mips_arch_string); if (file_mips_opts.isa != ISA_UNKNOWN) { /* Handle -mipsN. At this point, file_mips_opts.isa contains the ISA level specified by -mipsN, while arch_info->isa contains the -march selection (if any). */ if (arch_info != 0) { /* -march takes precedence over -mipsN, since it is more descriptive. There's no harm in specifying both as long as the ISA levels are the same. */ if (file_mips_opts.isa != arch_info->isa) as_bad (_("-%s conflicts with the other architecture options," " which imply -%s"), mips_cpu_info_from_isa (file_mips_opts.isa)->name, mips_cpu_info_from_isa (arch_info->isa)->name); } else arch_info = mips_cpu_info_from_isa (file_mips_opts.isa); } if (arch_info == 0) { arch_info = mips_parse_cpu ("default CPU", MIPS_CPU_STRING_DEFAULT); gas_assert (arch_info); } if (ABI_NEEDS_64BIT_REGS (mips_abi) && !ISA_HAS_64BIT_REGS (arch_info->isa)) as_bad (_("-march=%s is not compatible with the selected ABI"), arch_info->name); file_mips_opts.arch = arch_info->cpu; file_mips_opts.isa = arch_info->isa; /* Set up initial mips_opts state. */ mips_opts = file_mips_opts; /* The register size inference code is now placed in file_mips_check_options. */ /* Optimize for file_mips_opts.arch, unless -mtune selects a different processor. */ if (mips_tune_string != 0) tune_info = mips_parse_cpu ("-mtune", mips_tune_string); if (tune_info == 0) mips_set_tune (arch_info); else mips_set_tune (tune_info); if (mips_flag_mdebug < 0) mips_flag_mdebug = 0; } void mips_init_after_args (void) { /* initialize opcodes */ bfd_mips_num_opcodes = bfd_mips_num_builtin_opcodes; mips_opcodes = (struct mips_opcode *) mips_builtin_opcodes; } long md_pcrel_from (fixS *fixP) { valueT addr = fixP->fx_where + fixP->fx_frag->fr_address; switch (fixP->fx_r_type) { case BFD_RELOC_MICROMIPS_7_PCREL_S1: case BFD_RELOC_MICROMIPS_10_PCREL_S1: /* Return the address of the delay slot. */ return addr + 2; case BFD_RELOC_MICROMIPS_16_PCREL_S1: case BFD_RELOC_MICROMIPS_JMP: case BFD_RELOC_MIPS16_16_PCREL_S1: case BFD_RELOC_16_PCREL_S2: case BFD_RELOC_MIPS_21_PCREL_S2: case BFD_RELOC_MIPS_26_PCREL_S2: case BFD_RELOC_MIPS_JMP: /* Return the address of the delay slot. */ return addr + 4; case BFD_RELOC_MIPS_18_PCREL_S3: /* Return the aligned address of the doubleword containing the instruction. */ return addr & ~7; default: return addr; } } /* This is called before the symbol table is processed. In order to work with gcc when using mips-tfile, we must keep all local labels. However, in other cases, we want to discard them. If we were called with -g, but we didn't see any debugging information, it may mean that gcc is smuggling debugging information through to mips-tfile, in which case we must generate all local labels. */ void mips_frob_file_before_adjust (void) { #ifndef NO_ECOFF_DEBUGGING if (ECOFF_DEBUGGING && mips_debug != 0 && ! ecoff_debugging_seen) flag_keep_locals = 1; #endif } /* Sort any unmatched HI16 and GOT16 relocs so that they immediately precede the corresponding LO16 reloc. This is called before md_apply_fix and tc_gen_reloc. Unmatched relocs can only be generated by use of explicit relocation operators. For our purposes, a %lo() expression matches a %got() or %hi() expression if: (a) it refers to the same symbol; and (b) the offset applied in the %lo() expression is no lower than the offset applied in the %got() or %hi(). (b) allows us to cope with code like: lui $4,%hi(foo) lh $4,%lo(foo+2)($4) ...which is legal on RELA targets, and has a well-defined behaviour if the user knows that adding 2 to "foo" will not induce a carry to the high 16 bits. When several %lo()s match a particular %got() or %hi(), we use the following rules to distinguish them: (1) %lo()s with smaller offsets are a better match than %lo()s with higher offsets. (2) %lo()s with no matching %got() or %hi() are better than those that already have a matching %got() or %hi(). (3) later %lo()s are better than earlier %lo()s. These rules are applied in order. (1) means, among other things, that %lo()s with identical offsets are chosen if they exist. (2) means that we won't associate several high-part relocations with the same low-part relocation unless there's no alternative. Having several high parts for the same low part is a GNU extension; this rule allows careful users to avoid it. (3) is purely cosmetic. mips_hi_fixup_list is is in reverse order, with the last high-part relocation being at the front of the list. It therefore makes sense to choose the last matching low-part relocation, all other things being equal. It's also easier to code that way. */ void mips_frob_file (void) { struct mips_hi_fixup *l; bfd_reloc_code_real_type looking_for_rtype = BFD_RELOC_UNUSED; for (l = mips_hi_fixup_list; l != NULL; l = l->next) { segment_info_type *seginfo; bfd_boolean matched_lo_p; fixS **hi_pos, **lo_pos, **pos; gas_assert (reloc_needs_lo_p (l->fixp->fx_r_type)); /* If a GOT16 relocation turns out to be against a global symbol, there isn't supposed to be a matching LO. Ignore %gots against constants; we'll report an error for those later. */ if (got16_reloc_p (l->fixp->fx_r_type) && !(l->fixp->fx_addsy && pic_need_relax (l->fixp->fx_addsy, l->seg))) continue; /* Check quickly whether the next fixup happens to be a matching %lo. */ if (fixup_has_matching_lo_p (l->fixp)) continue; seginfo = seg_info (l->seg); /* Set HI_POS to the position of this relocation in the chain. Set LO_POS to the position of the chosen low-part relocation. MATCHED_LO_P is true on entry to the loop if *POS is a low-part relocation that matches an immediately-preceding high-part relocation. */ hi_pos = NULL; lo_pos = NULL; matched_lo_p = FALSE; looking_for_rtype = matching_lo_reloc (l->fixp->fx_r_type); for (pos = &seginfo->fix_root; *pos != NULL; pos = &(*pos)->fx_next) { if (*pos == l->fixp) hi_pos = pos; if ((*pos)->fx_r_type == looking_for_rtype && symbol_same_p ((*pos)->fx_addsy, l->fixp->fx_addsy) && (*pos)->fx_offset >= l->fixp->fx_offset && (lo_pos == NULL || (*pos)->fx_offset < (*lo_pos)->fx_offset || (!matched_lo_p && (*pos)->fx_offset == (*lo_pos)->fx_offset))) lo_pos = pos; matched_lo_p = (reloc_needs_lo_p ((*pos)->fx_r_type) && fixup_has_matching_lo_p (*pos)); } /* If we found a match, remove the high-part relocation from its current position and insert it before the low-part relocation. Make the offsets match so that fixup_has_matching_lo_p() will return true. We don't warn about unmatched high-part relocations since some versions of gcc have been known to emit dead "lui ...%hi(...)" instructions. */ if (lo_pos != NULL) { l->fixp->fx_offset = (*lo_pos)->fx_offset; if (l->fixp->fx_next != *lo_pos) { *hi_pos = l->fixp->fx_next; l->fixp->fx_next = *lo_pos; *lo_pos = l->fixp; } } } } int mips_force_relocation (fixS *fixp) { if (generic_force_reloc (fixp)) return 1; /* We want to keep BFD_RELOC_MICROMIPS_*_PCREL_S1 relocation, so that the linker relaxation can update targets. */ if (fixp->fx_r_type == BFD_RELOC_MICROMIPS_7_PCREL_S1 || fixp->fx_r_type == BFD_RELOC_MICROMIPS_10_PCREL_S1 || fixp->fx_r_type == BFD_RELOC_MICROMIPS_16_PCREL_S1) return 1; /* We want to keep BFD_RELOC_16_PCREL_S2 BFD_RELOC_MIPS_21_PCREL_S2 and BFD_RELOC_MIPS_26_PCREL_S2 relocations against MIPS16 and microMIPS symbols so that we can do cross-mode branch diagnostics and BAL to JALX conversion by the linker. */ if ((fixp->fx_r_type == BFD_RELOC_16_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_MIPS_21_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_MIPS_26_PCREL_S2) && fixp->fx_addsy && ELF_ST_IS_COMPRESSED (S_GET_OTHER (fixp->fx_addsy))) return 1; /* We want all PC-relative relocations to be kept for R6 relaxation. */ if (ISA_IS_R6 (file_mips_opts.isa) && (fixp->fx_r_type == BFD_RELOC_16_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_MIPS_21_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_MIPS_26_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_MIPS_18_PCREL_S3 || fixp->fx_r_type == BFD_RELOC_MIPS_19_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_HI16_S_PCREL || fixp->fx_r_type == BFD_RELOC_LO16_PCREL)) return 1; return 0; } /* Implement TC_FORCE_RELOCATION_ABS. */ bfd_boolean mips_force_relocation_abs (fixS *fixp) { if (generic_force_reloc (fixp)) return TRUE; /* These relocations do not have enough bits in the in-place addend to hold an arbitrary absolute section's offset. */ if (HAVE_IN_PLACE_ADDENDS && limited_pcrel_reloc_p (fixp->fx_r_type)) return TRUE; return FALSE; } /* Read the instruction associated with RELOC from BUF. */ static unsigned int read_reloc_insn (char *buf, bfd_reloc_code_real_type reloc) { if (mips16_reloc_p (reloc) || micromips_reloc_p (reloc)) return read_compressed_insn (buf, 4); else return read_insn (buf); } /* Write instruction INSN to BUF, given that it has been relocated by RELOC. */ static void write_reloc_insn (char *buf, bfd_reloc_code_real_type reloc, unsigned long insn) { if (mips16_reloc_p (reloc) || micromips_reloc_p (reloc)) write_compressed_insn (buf, insn, 4); else write_insn (buf, insn); } /* Return TRUE if the instruction pointed to by FIXP is an invalid jump to a symbol in another ISA mode, which cannot be converted to JALX. */ static bfd_boolean fix_bad_cross_mode_jump_p (fixS *fixP) { unsigned long opcode; int other; char *buf; if (!fixP->fx_addsy || S_FORCE_RELOC (fixP->fx_addsy, TRUE)) return FALSE; other = S_GET_OTHER (fixP->fx_addsy); buf = fixP->fx_frag->fr_literal + fixP->fx_where; opcode = read_reloc_insn (buf, fixP->fx_r_type) >> 26; switch (fixP->fx_r_type) { case BFD_RELOC_MIPS_JMP: return opcode != 0x1d && opcode != 0x03 && ELF_ST_IS_COMPRESSED (other); case BFD_RELOC_MICROMIPS_JMP: return opcode != 0x3c && opcode != 0x3d && !ELF_ST_IS_MICROMIPS (other); default: return FALSE; } } /* Return TRUE if the instruction pointed to by FIXP is an invalid JALX jump to a symbol in the same ISA mode. */ static bfd_boolean fix_bad_same_mode_jalx_p (fixS *fixP) { unsigned long opcode; int other; char *buf; if (!fixP->fx_addsy || S_FORCE_RELOC (fixP->fx_addsy, TRUE)) return FALSE; other = S_GET_OTHER (fixP->fx_addsy); buf = fixP->fx_frag->fr_literal + fixP->fx_where; opcode = read_reloc_insn (buf, fixP->fx_r_type) >> 26; switch (fixP->fx_r_type) { case BFD_RELOC_MIPS_JMP: return opcode == 0x1d && !ELF_ST_IS_COMPRESSED (other); case BFD_RELOC_MIPS16_JMP: return opcode == 0x07 && ELF_ST_IS_COMPRESSED (other); case BFD_RELOC_MICROMIPS_JMP: return opcode == 0x3c && ELF_ST_IS_COMPRESSED (other); default: return FALSE; } } /* Return TRUE if the instruction pointed to by FIXP is an invalid jump to a symbol whose value plus addend is not aligned according to the ultimate (after linker relaxation) jump instruction's immediate field requirement, either to (1 << SHIFT), or, for jumps from microMIPS to regular MIPS code, to (1 << 2). */ static bfd_boolean fix_bad_misaligned_jump_p (fixS *fixP, int shift) { bfd_boolean micro_to_mips_p; valueT val; int other; if (!fixP->fx_addsy || S_FORCE_RELOC (fixP->fx_addsy, TRUE)) return FALSE; other = S_GET_OTHER (fixP->fx_addsy); val = S_GET_VALUE (fixP->fx_addsy) | ELF_ST_IS_COMPRESSED (other); val += fixP->fx_offset; micro_to_mips_p = (fixP->fx_r_type == BFD_RELOC_MICROMIPS_JMP && !ELF_ST_IS_MICROMIPS (other)); return ((val & ((1 << (micro_to_mips_p ? 2 : shift)) - 1)) != ELF_ST_IS_COMPRESSED (other)); } /* Return TRUE if the instruction pointed to by FIXP is an invalid branch to a symbol whose annotation indicates another ISA mode. For absolute symbols check the ISA bit instead. We accept BFD_RELOC_16_PCREL_S2 relocations against MIPS16 and microMIPS symbols or BFD_RELOC_MICROMIPS_16_PCREL_S1 relocations against regular MIPS symbols and associated with BAL instructions as these instructions may be be converted to JALX by the linker. */ static bfd_boolean fix_bad_cross_mode_branch_p (fixS *fixP) { bfd_boolean absolute_p; unsigned long opcode; asection *symsec; valueT val; int other; char *buf; if (!fixP->fx_addsy || S_FORCE_RELOC (fixP->fx_addsy, TRUE)) return FALSE; symsec = S_GET_SEGMENT (fixP->fx_addsy); absolute_p = bfd_is_abs_section (symsec); val = S_GET_VALUE (fixP->fx_addsy) + fixP->fx_offset; other = S_GET_OTHER (fixP->fx_addsy); buf = fixP->fx_frag->fr_literal + fixP->fx_where; opcode = read_reloc_insn (buf, fixP->fx_r_type) >> 16; switch (fixP->fx_r_type) { case BFD_RELOC_16_PCREL_S2: return ((absolute_p ? val & 1 : ELF_ST_IS_COMPRESSED (other)) && opcode != 0x0411); case BFD_RELOC_MICROMIPS_16_PCREL_S1: return ((absolute_p ? !(val & 1) : !ELF_ST_IS_MICROMIPS (other)) && opcode != 0x4060); case BFD_RELOC_MIPS_21_PCREL_S2: case BFD_RELOC_MIPS_26_PCREL_S2: return absolute_p ? val & 1 : ELF_ST_IS_COMPRESSED (other); case BFD_RELOC_MIPS16_16_PCREL_S1: return absolute_p ? !(val & 1) : !ELF_ST_IS_MIPS16 (other); case BFD_RELOC_MICROMIPS_7_PCREL_S1: case BFD_RELOC_MICROMIPS_10_PCREL_S1: return absolute_p ? !(val & 1) : !ELF_ST_IS_MICROMIPS (other); default: abort (); } } /* Return TRUE if the symbol plus addend associated with a regular MIPS branch instruction pointed to by FIXP is not aligned according to the branch instruction's immediate field requirement. We need the addend to preserve the ISA bit and also the sum must not have bit 2 set. We must explicitly OR in the ISA bit from symbol annotation as the bit won't be set in the symbol's value then. */ static bfd_boolean fix_bad_misaligned_branch_p (fixS *fixP) { bfd_boolean absolute_p; asection *symsec; valueT isa_bit; valueT val; valueT off; int other; if (!fixP->fx_addsy || S_FORCE_RELOC (fixP->fx_addsy, TRUE)) return FALSE; symsec = S_GET_SEGMENT (fixP->fx_addsy); absolute_p = bfd_is_abs_section (symsec); val = S_GET_VALUE (fixP->fx_addsy); other = S_GET_OTHER (fixP->fx_addsy); off = fixP->fx_offset; isa_bit = absolute_p ? (val + off) & 1 : ELF_ST_IS_COMPRESSED (other); val |= ELF_ST_IS_COMPRESSED (other); val += off; return (val & 0x3) != isa_bit; } /* Make the necessary checks on a regular MIPS branch pointed to by FIXP and its calculated value VAL. */ static void fix_validate_branch (fixS *fixP, valueT val) { if (fixP->fx_done && (val & 0x3) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("branch to misaligned address (0x%lx)"), (long) (val + md_pcrel_from (fixP))); else if (fix_bad_cross_mode_branch_p (fixP)) as_bad_where (fixP->fx_file, fixP->fx_line, _("branch to a symbol in another ISA mode")); else if (fix_bad_misaligned_branch_p (fixP)) as_bad_where (fixP->fx_file, fixP->fx_line, _("branch to misaligned address (0x%lx)"), (long) (S_GET_VALUE (fixP->fx_addsy) + fixP->fx_offset)); else if (HAVE_IN_PLACE_ADDENDS && (fixP->fx_offset & 0x3) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("cannot encode misaligned addend " "in the relocatable field (0x%lx)"), (long) fixP->fx_offset); } /* Apply a fixup to the object file. */ void md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) { char *buf; unsigned long insn; reloc_howto_type *howto; if (fixP->fx_pcrel) switch (fixP->fx_r_type) { case BFD_RELOC_16_PCREL_S2: case BFD_RELOC_MIPS16_16_PCREL_S1: case BFD_RELOC_MICROMIPS_7_PCREL_S1: case BFD_RELOC_MICROMIPS_10_PCREL_S1: case BFD_RELOC_MICROMIPS_16_PCREL_S1: case BFD_RELOC_32_PCREL: case BFD_RELOC_MIPS_21_PCREL_S2: case BFD_RELOC_MIPS_26_PCREL_S2: case BFD_RELOC_MIPS_18_PCREL_S3: case BFD_RELOC_MIPS_19_PCREL_S2: case BFD_RELOC_HI16_S_PCREL: case BFD_RELOC_LO16_PCREL: break; case BFD_RELOC_32: fixP->fx_r_type = BFD_RELOC_32_PCREL; break; default: as_bad_where (fixP->fx_file, fixP->fx_line, _("PC-relative reference to a different section")); break; } /* Handle BFD_RELOC_8, since it's easy. Punt on other bfd relocations that have no MIPS ELF equivalent. */ if (fixP->fx_r_type != BFD_RELOC_8) { howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); if (!howto) return; } gas_assert (fixP->fx_size == 2 || fixP->fx_size == 4 || fixP->fx_r_type == BFD_RELOC_8 || fixP->fx_r_type == BFD_RELOC_16 || fixP->fx_r_type == BFD_RELOC_64 || fixP->fx_r_type == BFD_RELOC_CTOR || fixP->fx_r_type == BFD_RELOC_MIPS_SUB || fixP->fx_r_type == BFD_RELOC_MICROMIPS_SUB || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY || fixP->fx_r_type == BFD_RELOC_MIPS_TLS_DTPREL64 || fixP->fx_r_type == BFD_RELOC_NONE); buf = fixP->fx_frag->fr_literal + fixP->fx_where; /* Don't treat parts of a composite relocation as done. There are two reasons for this: (1) The second and third parts will be against 0 (RSS_UNDEF) but should nevertheless be emitted if the first part is. (2) In normal usage, composite relocations are never assembly-time constants. The easiest way of dealing with the pathological exceptions is to generate a relocation against STN_UNDEF and leave everything up to the linker. */ if (fixP->fx_addsy == NULL && !fixP->fx_pcrel && fixP->fx_tcbit == 0) fixP->fx_done = 1; switch (fixP->fx_r_type) { case BFD_RELOC_MIPS_TLS_GD: case BFD_RELOC_MIPS_TLS_LDM: case BFD_RELOC_MIPS_TLS_DTPREL32: case BFD_RELOC_MIPS_TLS_DTPREL64: case BFD_RELOC_MIPS_TLS_DTPREL_HI16: case BFD_RELOC_MIPS_TLS_DTPREL_LO16: case BFD_RELOC_MIPS_TLS_GOTTPREL: case BFD_RELOC_MIPS_TLS_TPREL32: case BFD_RELOC_MIPS_TLS_TPREL64: case BFD_RELOC_MIPS_TLS_TPREL_HI16: case BFD_RELOC_MIPS_TLS_TPREL_LO16: case BFD_RELOC_MICROMIPS_TLS_GD: case BFD_RELOC_MICROMIPS_TLS_LDM: case BFD_RELOC_MICROMIPS_TLS_DTPREL_HI16: case BFD_RELOC_MICROMIPS_TLS_DTPREL_LO16: case BFD_RELOC_MICROMIPS_TLS_GOTTPREL: case BFD_RELOC_MICROMIPS_TLS_TPREL_HI16: case BFD_RELOC_MICROMIPS_TLS_TPREL_LO16: case BFD_RELOC_MIPS16_TLS_GD: case BFD_RELOC_MIPS16_TLS_LDM: case BFD_RELOC_MIPS16_TLS_DTPREL_HI16: case BFD_RELOC_MIPS16_TLS_DTPREL_LO16: case BFD_RELOC_MIPS16_TLS_GOTTPREL: case BFD_RELOC_MIPS16_TLS_TPREL_HI16: case BFD_RELOC_MIPS16_TLS_TPREL_LO16: if (fixP->fx_addsy) S_SET_THREAD_LOCAL (fixP->fx_addsy); else as_bad_where (fixP->fx_file, fixP->fx_line, _("TLS relocation against a constant")); break; case BFD_RELOC_MIPS_JMP: case BFD_RELOC_MIPS16_JMP: case BFD_RELOC_MICROMIPS_JMP: { int shift; gas_assert (!fixP->fx_done); /* Shift is 2, unusually, for microMIPS JALX. */ if (fixP->fx_r_type == BFD_RELOC_MICROMIPS_JMP && (read_compressed_insn (buf, 4) >> 26) != 0x3c) shift = 1; else shift = 2; if (fix_bad_cross_mode_jump_p (fixP)) as_bad_where (fixP->fx_file, fixP->fx_line, _("jump to a symbol in another ISA mode")); else if (fix_bad_same_mode_jalx_p (fixP)) as_bad_where (fixP->fx_file, fixP->fx_line, _("JALX to a symbol in the same ISA mode")); else if (fix_bad_misaligned_jump_p (fixP, shift)) as_bad_where (fixP->fx_file, fixP->fx_line, _("jump to misaligned address (0x%lx)"), (long) (S_GET_VALUE (fixP->fx_addsy) + fixP->fx_offset)); else if (HAVE_IN_PLACE_ADDENDS && (fixP->fx_offset & ((1 << shift) - 1)) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("cannot encode misaligned addend " "in the relocatable field (0x%lx)"), (long) fixP->fx_offset); } /* Fall through. */ case BFD_RELOC_MIPS_SHIFT5: case BFD_RELOC_MIPS_SHIFT6: case BFD_RELOC_MIPS_GOT_DISP: case BFD_RELOC_MIPS_GOT_PAGE: case BFD_RELOC_MIPS_GOT_OFST: case BFD_RELOC_MIPS_SUB: case BFD_RELOC_MIPS_INSERT_A: case BFD_RELOC_MIPS_INSERT_B: case BFD_RELOC_MIPS_DELETE: case BFD_RELOC_MIPS_HIGHEST: case BFD_RELOC_MIPS_HIGHER: case BFD_RELOC_MIPS_SCN_DISP: case BFD_RELOC_MIPS_REL16: case BFD_RELOC_MIPS_RELGOT: case BFD_RELOC_MIPS_JALR: case BFD_RELOC_HI16: case BFD_RELOC_HI16_S: case BFD_RELOC_LO16: case BFD_RELOC_GPREL16: case BFD_RELOC_MIPS_LITERAL: case BFD_RELOC_MIPS_CALL16: case BFD_RELOC_MIPS_GOT16: case BFD_RELOC_GPREL32: case BFD_RELOC_MIPS_GOT_HI16: case BFD_RELOC_MIPS_GOT_LO16: case BFD_RELOC_MIPS_CALL_HI16: case BFD_RELOC_MIPS_CALL_LO16: case BFD_RELOC_HI16_S_PCREL: case BFD_RELOC_LO16_PCREL: case BFD_RELOC_MIPS16_GPREL: case BFD_RELOC_MIPS16_GOT16: case BFD_RELOC_MIPS16_CALL16: case BFD_RELOC_MIPS16_HI16: case BFD_RELOC_MIPS16_HI16_S: case BFD_RELOC_MIPS16_LO16: case BFD_RELOC_MICROMIPS_GOT_DISP: case BFD_RELOC_MICROMIPS_GOT_PAGE: case BFD_RELOC_MICROMIPS_GOT_OFST: case BFD_RELOC_MICROMIPS_SUB: case BFD_RELOC_MICROMIPS_HIGHEST: case BFD_RELOC_MICROMIPS_HIGHER: case BFD_RELOC_MICROMIPS_SCN_DISP: case BFD_RELOC_MICROMIPS_JALR: case BFD_RELOC_MICROMIPS_HI16: case BFD_RELOC_MICROMIPS_HI16_S: case BFD_RELOC_MICROMIPS_LO16: case BFD_RELOC_MICROMIPS_GPREL16: case BFD_RELOC_MICROMIPS_LITERAL: case BFD_RELOC_MICROMIPS_CALL16: case BFD_RELOC_MICROMIPS_GOT16: case BFD_RELOC_MICROMIPS_GOT_HI16: case BFD_RELOC_MICROMIPS_GOT_LO16: case BFD_RELOC_MICROMIPS_CALL_HI16: case BFD_RELOC_MICROMIPS_CALL_LO16: case BFD_RELOC_MIPS_EH: if (fixP->fx_done) { offsetT value; if (calculate_reloc (fixP->fx_r_type, *valP, &value)) { insn = read_reloc_insn (buf, fixP->fx_r_type); if (mips16_reloc_p (fixP->fx_r_type)) insn |= mips16_immed_extend (value, 16); else insn |= (value & 0xffff); write_reloc_insn (buf, fixP->fx_r_type, insn); } else as_bad_where (fixP->fx_file, fixP->fx_line, _("unsupported constant in relocation")); } break; case BFD_RELOC_64: /* This is handled like BFD_RELOC_32, but we output a sign extended value if we are only 32 bits. */ if (fixP->fx_done) { if (8 <= sizeof (valueT)) md_number_to_chars (buf, *valP, 8); else { valueT hiv; if ((*valP & 0x80000000) != 0) hiv = 0xffffffff; else hiv = 0; md_number_to_chars (buf + (target_big_endian ? 4 : 0), *valP, 4); md_number_to_chars (buf + (target_big_endian ? 0 : 4), hiv, 4); } } break; case BFD_RELOC_RVA: case BFD_RELOC_32: case BFD_RELOC_32_PCREL: case BFD_RELOC_16: case BFD_RELOC_8: /* If we are deleting this reloc entry, we must fill in the value now. This can happen if we have a .word which is not resolved when it appears but is later defined. */ if (fixP->fx_done) md_number_to_chars (buf, *valP, fixP->fx_size); break; case BFD_RELOC_MIPS_21_PCREL_S2: fix_validate_branch (fixP, *valP); if (!fixP->fx_done) break; if (*valP + 0x400000 <= 0x7fffff) { insn = read_insn (buf); insn |= (*valP >> 2) & 0x1fffff; write_insn (buf, insn); } else as_bad_where (fixP->fx_file, fixP->fx_line, _("branch out of range")); break; case BFD_RELOC_MIPS_26_PCREL_S2: fix_validate_branch (fixP, *valP); if (!fixP->fx_done) break; if (*valP + 0x8000000 <= 0xfffffff) { insn = read_insn (buf); insn |= (*valP >> 2) & 0x3ffffff; write_insn (buf, insn); } else as_bad_where (fixP->fx_file, fixP->fx_line, _("branch out of range")); break; case BFD_RELOC_MIPS_18_PCREL_S3: if (fixP->fx_addsy && (S_GET_VALUE (fixP->fx_addsy) & 0x7) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("PC-relative access using misaligned symbol (%lx)"), (long) S_GET_VALUE (fixP->fx_addsy)); if ((fixP->fx_offset & 0x7) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("PC-relative access using misaligned offset (%lx)"), (long) fixP->fx_offset); if (!fixP->fx_done) break; if (*valP + 0x100000 <= 0x1fffff) { insn = read_insn (buf); insn |= (*valP >> 3) & 0x3ffff; write_insn (buf, insn); } else as_bad_where (fixP->fx_file, fixP->fx_line, _("PC-relative access out of range")); break; case BFD_RELOC_MIPS_19_PCREL_S2: if ((*valP & 0x3) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("PC-relative access to misaligned address (%lx)"), (long) *valP); if (!fixP->fx_done) break; if (*valP + 0x100000 <= 0x1fffff) { insn = read_insn (buf); insn |= (*valP >> 2) & 0x7ffff; write_insn (buf, insn); } else as_bad_where (fixP->fx_file, fixP->fx_line, _("PC-relative access out of range")); break; case BFD_RELOC_16_PCREL_S2: fix_validate_branch (fixP, *valP); /* We need to save the bits in the instruction since fixup_segment() might be deleting the relocation entry (i.e., a branch within the current segment). */ if (! fixP->fx_done) break; /* Update old instruction data. */ insn = read_insn (buf); if (*valP + 0x20000 <= 0x3ffff) { insn |= (*valP >> 2) & 0xffff; write_insn (buf, insn); } else if (mips_pic == NO_PIC && fixP->fx_done && fixP->fx_frag->fr_address >= text_section->vma && (fixP->fx_frag->fr_address < text_section->vma + bfd_get_section_size (text_section)) && ((insn & 0xffff0000) == 0x10000000 /* beq $0,$0 */ || (insn & 0xffff0000) == 0x04010000 /* bgez $0 */ || (insn & 0xffff0000) == 0x04110000)) /* bgezal $0 */ { /* The branch offset is too large. If this is an unconditional branch, and we are not generating PIC code, we can convert it to an absolute jump instruction. */ if ((insn & 0xffff0000) == 0x04110000) /* bgezal $0 */ insn = 0x0c000000; /* jal */ else insn = 0x08000000; /* j */ fixP->fx_r_type = BFD_RELOC_MIPS_JMP; fixP->fx_done = 0; fixP->fx_addsy = section_symbol (text_section); *valP += md_pcrel_from (fixP); write_insn (buf, insn); } else { /* If we got here, we have branch-relaxation disabled, and there's nothing we can do to fix this instruction without turning it into a longer sequence. */ as_bad_where (fixP->fx_file, fixP->fx_line, _("branch out of range")); } break; case BFD_RELOC_MIPS16_16_PCREL_S1: case BFD_RELOC_MICROMIPS_7_PCREL_S1: case BFD_RELOC_MICROMIPS_10_PCREL_S1: case BFD_RELOC_MICROMIPS_16_PCREL_S1: gas_assert (!fixP->fx_done); if (fix_bad_cross_mode_branch_p (fixP)) as_bad_where (fixP->fx_file, fixP->fx_line, _("branch to a symbol in another ISA mode")); else if (fixP->fx_addsy && !S_FORCE_RELOC (fixP->fx_addsy, TRUE) && !bfd_is_abs_section (S_GET_SEGMENT (fixP->fx_addsy)) && (fixP->fx_offset & 0x1) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("branch to misaligned address (0x%lx)"), (long) (S_GET_VALUE (fixP->fx_addsy) + fixP->fx_offset)); else if (HAVE_IN_PLACE_ADDENDS && (fixP->fx_offset & 0x1) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("cannot encode misaligned addend " "in the relocatable field (0x%lx)"), (long) fixP->fx_offset); break; case BFD_RELOC_VTABLE_INHERIT: fixP->fx_done = 0; if (fixP->fx_addsy && !S_IS_DEFINED (fixP->fx_addsy) && !S_IS_WEAK (fixP->fx_addsy)) S_SET_WEAK (fixP->fx_addsy); break; case BFD_RELOC_NONE: case BFD_RELOC_VTABLE_ENTRY: fixP->fx_done = 0; break; default: abort (); } /* Remember value for tc_gen_reloc. */ fixP->fx_addnumber = *valP; } static symbolS * get_symbol (void) { int c; char *name; symbolS *p; c = get_symbol_name (&name); p = (symbolS *) symbol_find_or_make (name); (void) restore_line_pointer (c); return p; } /* Align the current frag to a given power of two. If a particular fill byte should be used, FILL points to an integer that contains that byte, otherwise FILL is null. This function used to have the comment: The MIPS assembler also automatically adjusts any preceding label. The implementation therefore applied the adjustment to a maximum of one label. However, other label adjustments are applied to batches of labels, and adjusting just one caused problems when new labels were added for the sake of debugging or unwind information. We therefore adjust all preceding labels (given as LABELS) instead. */ static void mips_align (int to, int *fill, struct insn_label_list *labels) { mips_emit_delays (); mips_record_compressed_mode (); if (fill == NULL && subseg_text_p (now_seg)) frag_align_code (to, 0); else frag_align (to, fill ? *fill : 0, 0); record_alignment (now_seg, to); mips_move_labels (labels, FALSE); } /* Align to a given power of two. .align 0 turns off the automatic alignment used by the data creating pseudo-ops. */ static void s_align (int x ATTRIBUTE_UNUSED) { int temp, fill_value, *fill_ptr; long max_alignment = 28; /* o Note that the assembler pulls down any immediately preceding label to the aligned address. o It's not documented but auto alignment is reinstated by a .align pseudo instruction. o Note also that after auto alignment is turned off the mips assembler issues an error on attempt to assemble an improperly aligned data item. We don't. */ temp = get_absolute_expression (); if (temp > max_alignment) as_bad (_("alignment too large, %d assumed"), temp = max_alignment); else if (temp < 0) { as_warn (_("alignment negative, 0 assumed")); temp = 0; } if (*input_line_pointer == ',') { ++input_line_pointer; fill_value = get_absolute_expression (); fill_ptr = &fill_value; } else fill_ptr = 0; if (temp) { segment_info_type *si = seg_info (now_seg); struct insn_label_list *l = si->label_list; /* Auto alignment should be switched on by next section change. */ auto_align = 1; mips_align (temp, fill_ptr, l); } else { auto_align = 0; } demand_empty_rest_of_line (); } static void s_change_sec (int sec) { segT seg; /* The ELF backend needs to know that we are changing sections, so that .previous works correctly. We could do something like check for an obj_section_change_hook macro, but that might be confusing as it would not be appropriate to use it in the section changing functions in read.c, since obj-elf.c intercepts those. FIXME: This should be cleaner, somehow. */ obj_elf_section_change_hook (); mips_emit_delays (); switch (sec) { case 't': s_text (0); break; case 'd': s_data (0); break; case 'b': subseg_set (bss_section, (subsegT) get_absolute_expression ()); demand_empty_rest_of_line (); break; case 'r': seg = subseg_new (RDATA_SECTION_NAME, (subsegT) get_absolute_expression ()); bfd_set_section_flags (stdoutput, seg, (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_RELOC | SEC_DATA)); if (strncmp (TARGET_OS, "elf", 3) != 0) record_alignment (seg, 4); demand_empty_rest_of_line (); break; case 's': seg = subseg_new (".sdata", (subsegT) get_absolute_expression ()); bfd_set_section_flags (stdoutput, seg, SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_DATA); if (strncmp (TARGET_OS, "elf", 3) != 0) record_alignment (seg, 4); demand_empty_rest_of_line (); break; case 'B': seg = subseg_new (".sbss", (subsegT) get_absolute_expression ()); bfd_set_section_flags (stdoutput, seg, SEC_ALLOC); if (strncmp (TARGET_OS, "elf", 3) != 0) record_alignment (seg, 4); demand_empty_rest_of_line (); break; } auto_align = 1; } void s_change_section (int ignore ATTRIBUTE_UNUSED) { char *saved_ilp; char *section_name; char c, endc; char next_c = 0; int section_type; int section_flag; int section_entry_size; int section_alignment; saved_ilp = input_line_pointer; endc = get_symbol_name (&section_name); c = (endc == '"' ? input_line_pointer[1] : endc); if (c) next_c = input_line_pointer [(endc == '"' ? 2 : 1)]; /* Do we have .section Name<,"flags">? */ if (c != ',' || (c == ',' && next_c == '"')) { /* Just after name is now '\0'. */ (void) restore_line_pointer (endc); input_line_pointer = saved_ilp; obj_elf_section (ignore); return; } section_name = xstrdup (section_name); c = restore_line_pointer (endc); input_line_pointer++; /* Do we have .section Name<,type><,flag><,entry_size><,alignment> */ if (c == ',') section_type = get_absolute_expression (); else section_type = 0; if (*input_line_pointer++ == ',') section_flag = get_absolute_expression (); else section_flag = 0; if (*input_line_pointer++ == ',') section_entry_size = get_absolute_expression (); else section_entry_size = 0; if (*input_line_pointer++ == ',') section_alignment = get_absolute_expression (); else section_alignment = 0; /* FIXME: really ignore? */ (void) section_alignment; /* When using the generic form of .section (as implemented by obj-elf.c), there's no way to set the section type to SHT_MIPS_DWARF. Users have traditionally had to fall back on the more common @progbits instead. There's nothing really harmful in this, since bfd will correct SHT_PROGBITS to SHT_MIPS_DWARF before writing out the file. But it means that, for backwards compatibility, the special_section entries for dwarf sections must use SHT_PROGBITS rather than SHT_MIPS_DWARF. Even so, we shouldn't force users of the MIPS .section syntax to incorrectly label the sections as SHT_PROGBITS. The best compromise seems to be to map SHT_MIPS_DWARF to SHT_PROGBITS before calling the generic type-checking code. */ if (section_type == SHT_MIPS_DWARF) section_type = SHT_PROGBITS; obj_elf_change_section (section_name, section_type, section_flag, section_entry_size, 0, 0, 0); if (now_seg->name != section_name) free (section_name); } void mips_enable_auto_align (void) { auto_align = 1; } static void s_cons (int log_size) { segment_info_type *si = seg_info (now_seg); struct insn_label_list *l = si->label_list; mips_emit_delays (); if (log_size > 0 && auto_align) mips_align (log_size, 0, l); cons (1 << log_size); mips_clear_insn_labels (); } static void s_float_cons (int type) { segment_info_type *si = seg_info (now_seg); struct insn_label_list *l = si->label_list; mips_emit_delays (); if (auto_align) { if (type == 'd') mips_align (3, 0, l); else mips_align (2, 0, l); } float_cons (type); mips_clear_insn_labels (); } /* Handle .globl. We need to override it because on Irix 5 you are permitted to say .globl foo .text where foo is an undefined symbol, to mean that foo should be considered to be the address of a function. */ static void s_mips_globl (int x ATTRIBUTE_UNUSED) { char *name; int c; symbolS *symbolP; flagword flag; do { c = get_symbol_name (&name); symbolP = symbol_find_or_make (name); S_SET_EXTERNAL (symbolP); *input_line_pointer = c; SKIP_WHITESPACE_AFTER_NAME (); /* On Irix 5, every global symbol that is not explicitly labelled as being a function is apparently labelled as being an object. */ flag = BSF_OBJECT; if (!is_end_of_line[(unsigned char) *input_line_pointer] && (*input_line_pointer != ',')) { char *secname; asection *sec; c = get_symbol_name (&secname); sec = bfd_get_section_by_name (stdoutput, secname); if (sec == NULL) as_bad (_("%s: no such section"), secname); (void) restore_line_pointer (c); if (sec != NULL && (sec->flags & SEC_CODE) != 0) flag = BSF_FUNCTION; } symbol_get_bfdsym (symbolP)->flags |= flag; c = *input_line_pointer; if (c == ',') { input_line_pointer++; SKIP_WHITESPACE (); if (is_end_of_line[(unsigned char) *input_line_pointer]) c = '\n'; } } while (c == ','); demand_empty_rest_of_line (); } static void s_option (int x ATTRIBUTE_UNUSED) { char *opt; char c; c = get_symbol_name (&opt); if (*opt == 'O') { /* FIXME: What does this mean? */ } else if (strncmp (opt, "pic", 3) == 0 && ISDIGIT (opt[3]) && opt[4] == '\0') { int i; i = atoi (opt + 3); if (i != 0 && i != 2) as_bad (_(".option pic%d not supported"), i); else if (mips_pic == VXWORKS_PIC) as_bad (_(".option pic%d not supported in VxWorks PIC mode"), i); else if (i == 0) mips_pic = NO_PIC; else if (i == 2) { mips_pic = SVR4_PIC; mips_abicalls = TRUE; } if (mips_pic == SVR4_PIC) { if (g_switch_seen && g_switch_value != 0) as_warn (_("-G may not be used with SVR4 PIC code")); g_switch_value = 0; bfd_set_gp_size (stdoutput, 0); } } else as_warn (_("unrecognized option \"%s\""), opt); (void) restore_line_pointer (c); demand_empty_rest_of_line (); } /* This structure is used to hold a stack of .set values. */ struct mips_option_stack { struct mips_option_stack *next; struct mips_set_options options; }; static struct mips_option_stack *mips_opts_stack; /* Return status for .set/.module option handling. */ enum code_option_type { /* Unrecognized option. */ OPTION_TYPE_BAD = -1, /* Ordinary option. */ OPTION_TYPE_NORMAL, /* ISA changing option. */ OPTION_TYPE_ISA }; /* Handle common .set/.module options. Return status indicating option type. */ static enum code_option_type parse_code_option (char * name) { bfd_boolean isa_set = FALSE; const struct mips_ase *ase; if (strncmp (name, "at=", 3) == 0) { char *s = name + 3; if (!reg_lookup (&s, RTYPE_NUM | RTYPE_GP, &mips_opts.at)) as_bad (_("unrecognized register name `%s'"), s); } else if (strcmp (name, "at") == 0) mips_opts.at = ATREG; else if (strcmp (name, "noat") == 0) mips_opts.at = ZERO; else if (strcmp (name, "move") == 0 || strcmp (name, "novolatile") == 0) mips_opts.nomove = 0; else if (strcmp (name, "nomove") == 0 || strcmp (name, "volatile") == 0) mips_opts.nomove = 1; else if (strcmp (name, "bopt") == 0) mips_opts.nobopt = 0; else if (strcmp (name, "nobopt") == 0) mips_opts.nobopt = 1; else if (strcmp (name, "gp=32") == 0) mips_opts.gp = 32; else if (strcmp (name, "gp=64") == 0) mips_opts.gp = 64; else if (strcmp (name, "fp=32") == 0) mips_opts.fp = 32; else if (strcmp (name, "fp=xx") == 0) mips_opts.fp = 0; else if (strcmp (name, "fp=64") == 0) mips_opts.fp = 64; else if (strcmp (name, "softfloat") == 0) mips_opts.soft_float = 1; else if (strcmp (name, "hardfloat") == 0) mips_opts.soft_float = 0; else if (strcmp (name, "singlefloat") == 0) mips_opts.single_float = 1; else if (strcmp (name, "doublefloat") == 0) mips_opts.single_float = 0; else if (strcmp (name, "nooddspreg") == 0) mips_opts.oddspreg = 0; else if (strcmp (name, "oddspreg") == 0) mips_opts.oddspreg = 1; else if (strcmp (name, "mips16") == 0 || strcmp (name, "MIPS-16") == 0) mips_opts.mips16 = 1; else if (strcmp (name, "nomips16") == 0 || strcmp (name, "noMIPS-16") == 0) mips_opts.mips16 = 0; else if (strcmp (name, "micromips") == 0) mips_opts.micromips = 1; else if (strcmp (name, "nomicromips") == 0) mips_opts.micromips = 0; else if (name[0] == 'n' && name[1] == 'o' && (ase = mips_lookup_ase (name + 2))) mips_set_ase (ase, &mips_opts, FALSE); else if ((ase = mips_lookup_ase (name))) mips_set_ase (ase, &mips_opts, TRUE); else if (strncmp (name, "mips", 4) == 0 || strncmp (name, "arch=", 5) == 0) { /* Permit the user to change the ISA and architecture on the fly. Needless to say, misuse can cause serious problems. */ if (strncmp (name, "arch=", 5) == 0) { const struct mips_cpu_info *p; p = mips_parse_cpu ("internal use", name + 5); if (!p) as_bad (_("unknown architecture %s"), name + 5); else { mips_opts.arch = p->cpu; mips_opts.isa = p->isa; isa_set = TRUE; } } else if (strncmp (name, "mips", 4) == 0) { const struct mips_cpu_info *p; p = mips_parse_cpu ("internal use", name); if (!p) as_bad (_("unknown ISA level %s"), name + 4); else { mips_opts.arch = p->cpu; mips_opts.isa = p->isa; isa_set = TRUE; } } else as_bad (_("unknown ISA or architecture %s"), name); } else if (strcmp (name, "autoextend") == 0) mips_opts.noautoextend = 0; else if (strcmp (name, "noautoextend") == 0) mips_opts.noautoextend = 1; else if (strcmp (name, "insn32") == 0) mips_opts.insn32 = TRUE; else if (strcmp (name, "noinsn32") == 0) mips_opts.insn32 = FALSE; else if (strcmp (name, "sym32") == 0) mips_opts.sym32 = TRUE; else if (strcmp (name, "nosym32") == 0) mips_opts.sym32 = FALSE; else return OPTION_TYPE_BAD; return isa_set ? OPTION_TYPE_ISA : OPTION_TYPE_NORMAL; } /* Handle the .set pseudo-op. */ static void s_mipsset (int x ATTRIBUTE_UNUSED) { enum code_option_type type = OPTION_TYPE_NORMAL; char *name = input_line_pointer, ch; file_mips_check_options (); while (!is_end_of_line[(unsigned char) *input_line_pointer]) ++input_line_pointer; ch = *input_line_pointer; *input_line_pointer = '\0'; if (strchr (name, ',')) { /* Generic ".set" directive; use the generic handler. */ *input_line_pointer = ch; input_line_pointer = name; s_set (0); return; } if (strcmp (name, "reorder") == 0) { if (mips_opts.noreorder) end_noreorder (); } else if (strcmp (name, "noreorder") == 0) { if (!mips_opts.noreorder) start_noreorder (); } else if (strcmp (name, "macro") == 0) mips_opts.warn_about_macros = 0; else if (strcmp (name, "nomacro") == 0) { if (mips_opts.noreorder == 0) as_bad (_("`noreorder' must be set before `nomacro'")); mips_opts.warn_about_macros = 1; } else if (strcmp (name, "gp=default") == 0) mips_opts.gp = file_mips_opts.gp; else if (strcmp (name, "fp=default") == 0) mips_opts.fp = file_mips_opts.fp; else if (strcmp (name, "mips0") == 0 || strcmp (name, "arch=default") == 0) { mips_opts.isa = file_mips_opts.isa; mips_opts.arch = file_mips_opts.arch; mips_opts.gp = file_mips_opts.gp; mips_opts.fp = file_mips_opts.fp; } else if (strcmp (name, "push") == 0) { struct mips_option_stack *s; s = XNEW (struct mips_option_stack); s->next = mips_opts_stack; s->options = mips_opts; mips_opts_stack = s; } else if (strcmp (name, "pop") == 0) { struct mips_option_stack *s; s = mips_opts_stack; if (s == NULL) as_bad (_(".set pop with no .set push")); else { /* If we're changing the reorder mode we need to handle delay slots correctly. */ if (s->options.noreorder && ! mips_opts.noreorder) start_noreorder (); else if (! s->options.noreorder && mips_opts.noreorder) end_noreorder (); mips_opts = s->options; mips_opts_stack = s->next; free (s); } } else { type = parse_code_option (name); if (type == OPTION_TYPE_BAD) as_warn (_("tried to set unrecognized symbol: %s\n"), name); } /* The use of .set [arch|cpu]= historically 'fixes' the width of gp and fp registers based on what is supported by the arch/cpu. */ if (type == OPTION_TYPE_ISA) { switch (mips_opts.isa) { case 0: break; case ISA_MIPS1: /* MIPS I cannot support FPXX. */ mips_opts.fp = 32; /* fall-through. */ case ISA_MIPS2: case ISA_MIPS32: case ISA_MIPS32R2: case ISA_MIPS32R3: case ISA_MIPS32R5: mips_opts.gp = 32; if (mips_opts.fp != 0) mips_opts.fp = 32; break; case ISA_MIPS32R6: mips_opts.gp = 32; mips_opts.fp = 64; break; case ISA_MIPS3: case ISA_MIPS4: case ISA_MIPS5: case ISA_MIPS64: case ISA_MIPS64R2: case ISA_MIPS64R3: case ISA_MIPS64R5: case ISA_MIPS64R6: mips_opts.gp = 64; if (mips_opts.fp != 0) { if (mips_opts.arch == CPU_R5900) mips_opts.fp = 32; else mips_opts.fp = 64; } break; default: as_bad (_("unknown ISA level %s"), name + 4); break; } } mips_check_options (&mips_opts, FALSE); mips_check_isa_supports_ases (); *input_line_pointer = ch; demand_empty_rest_of_line (); } /* Handle the .module pseudo-op. */ static void s_module (int ignore ATTRIBUTE_UNUSED) { char *name = input_line_pointer, ch; while (!is_end_of_line[(unsigned char) *input_line_pointer]) ++input_line_pointer; ch = *input_line_pointer; *input_line_pointer = '\0'; if (!file_mips_opts_checked) { if (parse_code_option (name) == OPTION_TYPE_BAD) as_bad (_(".module used with unrecognized symbol: %s\n"), name); /* Update module level settings from mips_opts. */ file_mips_opts = mips_opts; } else as_bad (_(".module is not permitted after generating code")); *input_line_pointer = ch; demand_empty_rest_of_line (); } /* Handle the .abicalls pseudo-op. I believe this is equivalent to .option pic2. It means to generate SVR4 PIC calls. */ static void s_abicalls (int ignore ATTRIBUTE_UNUSED) { mips_pic = SVR4_PIC; mips_abicalls = TRUE; if (g_switch_seen && g_switch_value != 0) as_warn (_("-G may not be used with SVR4 PIC code")); g_switch_value = 0; bfd_set_gp_size (stdoutput, 0); demand_empty_rest_of_line (); } /* Handle the .cpload pseudo-op. This is used when generating SVR4 PIC code. It sets the $gp register for the function based on the function address, which is in the register named in the argument. This uses a relocation against _gp_disp, which is handled specially by the linker. The result is: lui $gp,%hi(_gp_disp) addiu $gp,$gp,%lo(_gp_disp) addu $gp,$gp,.cpload argument The .cpload argument is normally $25 == $t9. The -mno-shared option changes this to: lui $gp,%hi(__gnu_local_gp) addiu $gp,$gp,%lo(__gnu_local_gp) and the argument is ignored. This saves an instruction, but the resulting code is not position independent; it uses an absolute address for __gnu_local_gp. Thus code assembled with -mno-shared can go into an ordinary executable, but not into a shared library. */ static void s_cpload (int ignore ATTRIBUTE_UNUSED) { expressionS ex; int reg; int in_shared; file_mips_check_options (); /* If we are not generating SVR4 PIC code, or if this is NewABI code, .cpload is ignored. */ if (mips_pic != SVR4_PIC || HAVE_NEWABI) { s_ignore (0); return; } if (mips_opts.mips16) { as_bad (_("%s not supported in MIPS16 mode"), ".cpload"); ignore_rest_of_line (); return; } /* .cpload should be in a .set noreorder section. */ if (mips_opts.noreorder == 0) as_warn (_(".cpload not in noreorder section")); reg = tc_get_register (0); /* If we need to produce a 64-bit address, we are better off using the default instruction sequence. */ in_shared = mips_in_shared || HAVE_64BIT_SYMBOLS; ex.X_op = O_symbol; ex.X_add_symbol = symbol_find_or_make (in_shared ? "_gp_disp" : "__gnu_local_gp"); ex.X_op_symbol = NULL; ex.X_add_number = 0; /* In ELF, this symbol is implicitly an STT_OBJECT symbol. */ symbol_get_bfdsym (ex.X_add_symbol)->flags |= BSF_OBJECT; mips_mark_labels (); mips_assembling_insn = TRUE; macro_start (); macro_build_lui (&ex, mips_gp_register); macro_build (&ex, "addiu", "t,r,j", mips_gp_register, mips_gp_register, BFD_RELOC_LO16); if (in_shared) macro_build (NULL, "addu", "d,v,t", mips_gp_register, mips_gp_register, reg); macro_end (); mips_assembling_insn = FALSE; demand_empty_rest_of_line (); } /* Handle the .cpsetup pseudo-op defined for NewABI PIC code. The syntax is: .cpsetup $reg1, offset|$reg2, label If offset is given, this results in: sd $gp, offset($sp) lui $gp, %hi(%neg(%gp_rel(label))) addiu $gp, $gp, %lo(%neg(%gp_rel(label))) daddu $gp, $gp, $reg1 If $reg2 is given, this results in: or $reg2, $gp, $0 lui $gp, %hi(%neg(%gp_rel(label))) addiu $gp, $gp, %lo(%neg(%gp_rel(label))) daddu $gp, $gp, $reg1 $reg1 is normally $25 == $t9. The -mno-shared option replaces the last three instructions with lui $gp,%hi(_gp) addiu $gp,$gp,%lo(_gp) */ static void s_cpsetup (int ignore ATTRIBUTE_UNUSED) { expressionS ex_off; expressionS ex_sym; int reg1; file_mips_check_options (); /* If we are not generating SVR4 PIC code, .cpsetup is ignored. We also need NewABI support. */ if (mips_pic != SVR4_PIC || ! HAVE_NEWABI) { s_ignore (0); return; } if (mips_opts.mips16) { as_bad (_("%s not supported in MIPS16 mode"), ".cpsetup"); ignore_rest_of_line (); return; } reg1 = tc_get_register (0); SKIP_WHITESPACE (); if (*input_line_pointer != ',') { as_bad (_("missing argument separator ',' for .cpsetup")); return; } else ++input_line_pointer; SKIP_WHITESPACE (); if (*input_line_pointer == '$') { mips_cpreturn_register = tc_get_register (0); mips_cpreturn_offset = -1; } else { mips_cpreturn_offset = get_absolute_expression (); mips_cpreturn_register = -1; } SKIP_WHITESPACE (); if (*input_line_pointer != ',') { as_bad (_("missing argument separator ',' for .cpsetup")); return; } else ++input_line_pointer; SKIP_WHITESPACE (); expression (&ex_sym); mips_mark_labels (); mips_assembling_insn = TRUE; macro_start (); if (mips_cpreturn_register == -1) { ex_off.X_op = O_constant; ex_off.X_add_symbol = NULL; ex_off.X_op_symbol = NULL; ex_off.X_add_number = mips_cpreturn_offset; macro_build (&ex_off, "sd", "t,o(b)", mips_gp_register, BFD_RELOC_LO16, SP); } else move_register (mips_cpreturn_register, mips_gp_register); if (mips_in_shared || HAVE_64BIT_SYMBOLS) { macro_build (&ex_sym, "lui", LUI_FMT, mips_gp_register, -1, BFD_RELOC_GPREL16, BFD_RELOC_MIPS_SUB, BFD_RELOC_HI16_S); macro_build (&ex_sym, "addiu", "t,r,j", mips_gp_register, mips_gp_register, -1, BFD_RELOC_GPREL16, BFD_RELOC_MIPS_SUB, BFD_RELOC_LO16); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", mips_gp_register, mips_gp_register, reg1); } else { expressionS ex; ex.X_op = O_symbol; ex.X_add_symbol = symbol_find_or_make ("__gnu_local_gp"); ex.X_op_symbol = NULL; ex.X_add_number = 0; /* In ELF, this symbol is implicitly an STT_OBJECT symbol. */ symbol_get_bfdsym (ex.X_add_symbol)->flags |= BSF_OBJECT; macro_build_lui (&ex, mips_gp_register); macro_build (&ex, "addiu", "t,r,j", mips_gp_register, mips_gp_register, BFD_RELOC_LO16); } macro_end (); mips_assembling_insn = FALSE; demand_empty_rest_of_line (); } static void s_cplocal (int ignore ATTRIBUTE_UNUSED) { file_mips_check_options (); /* If we are not generating SVR4 PIC code, or if this is not NewABI code, .cplocal is ignored. */ if (mips_pic != SVR4_PIC || ! HAVE_NEWABI) { s_ignore (0); return; } if (mips_opts.mips16) { as_bad (_("%s not supported in MIPS16 mode"), ".cplocal"); ignore_rest_of_line (); return; } mips_gp_register = tc_get_register (0); demand_empty_rest_of_line (); } /* Handle the .cprestore pseudo-op. This stores $gp into a given offset from $sp. The offset is remembered, and after making a PIC call $gp is restored from that location. */ static void s_cprestore (int ignore ATTRIBUTE_UNUSED) { expressionS ex; file_mips_check_options (); /* If we are not generating SVR4 PIC code, or if this is NewABI code, .cprestore is ignored. */ if (mips_pic != SVR4_PIC || HAVE_NEWABI) { s_ignore (0); return; } if (mips_opts.mips16) { as_bad (_("%s not supported in MIPS16 mode"), ".cprestore"); ignore_rest_of_line (); return; } mips_cprestore_offset = get_absolute_expression (); mips_cprestore_valid = 1; ex.X_op = O_constant; ex.X_add_symbol = NULL; ex.X_op_symbol = NULL; ex.X_add_number = mips_cprestore_offset; mips_mark_labels (); mips_assembling_insn = TRUE; macro_start (); macro_build_ldst_constoffset (&ex, ADDRESS_STORE_INSN, mips_gp_register, SP, HAVE_64BIT_ADDRESSES); macro_end (); mips_assembling_insn = FALSE; demand_empty_rest_of_line (); } /* Handle the .cpreturn pseudo-op defined for NewABI PIC code. If an offset was given in the preceding .cpsetup, it results in: ld $gp, offset($sp) If a register $reg2 was given there, it results in: or $gp, $reg2, $0 */ static void s_cpreturn (int ignore ATTRIBUTE_UNUSED) { expressionS ex; file_mips_check_options (); /* If we are not generating SVR4 PIC code, .cpreturn is ignored. We also need NewABI support. */ if (mips_pic != SVR4_PIC || ! HAVE_NEWABI) { s_ignore (0); return; } if (mips_opts.mips16) { as_bad (_("%s not supported in MIPS16 mode"), ".cpreturn"); ignore_rest_of_line (); return; } mips_mark_labels (); mips_assembling_insn = TRUE; macro_start (); if (mips_cpreturn_register == -1) { ex.X_op = O_constant; ex.X_add_symbol = NULL; ex.X_op_symbol = NULL; ex.X_add_number = mips_cpreturn_offset; macro_build (&ex, "ld", "t,o(b)", mips_gp_register, BFD_RELOC_LO16, SP); } else move_register (mips_gp_register, mips_cpreturn_register); macro_end (); mips_assembling_insn = FALSE; demand_empty_rest_of_line (); } /* Handle a .dtprelword, .dtpreldword, .tprelword, or .tpreldword pseudo-op; DIRSTR says which. The pseudo-op generates a BYTES-size DTP- or TP-relative relocation of type RTYPE, for use in either DWARF debug information or MIPS16 TLS. */ static void s_tls_rel_directive (const size_t bytes, const char *dirstr, bfd_reloc_code_real_type rtype) { expressionS ex; char *p; expression (&ex); if (ex.X_op != O_symbol) { as_bad (_("unsupported use of %s"), dirstr); ignore_rest_of_line (); } p = frag_more (bytes); md_number_to_chars (p, 0, bytes); fix_new_exp (frag_now, p - frag_now->fr_literal, bytes, &ex, FALSE, rtype); demand_empty_rest_of_line (); mips_clear_insn_labels (); } /* Handle .dtprelword. */ static void s_dtprelword (int ignore ATTRIBUTE_UNUSED) { s_tls_rel_directive (4, ".dtprelword", BFD_RELOC_MIPS_TLS_DTPREL32); } /* Handle .dtpreldword. */ static void s_dtpreldword (int ignore ATTRIBUTE_UNUSED) { s_tls_rel_directive (8, ".dtpreldword", BFD_RELOC_MIPS_TLS_DTPREL64); } /* Handle .tprelword. */ static void s_tprelword (int ignore ATTRIBUTE_UNUSED) { s_tls_rel_directive (4, ".tprelword", BFD_RELOC_MIPS_TLS_TPREL32); } /* Handle .tpreldword. */ static void s_tpreldword (int ignore ATTRIBUTE_UNUSED) { s_tls_rel_directive (8, ".tpreldword", BFD_RELOC_MIPS_TLS_TPREL64); } /* Handle the .gpvalue pseudo-op. This is used when generating NewABI PIC code. It sets the offset to use in gp_rel relocations. */ static void s_gpvalue (int ignore ATTRIBUTE_UNUSED) { /* If we are not generating SVR4 PIC code, .gpvalue is ignored. We also need NewABI support. */ if (mips_pic != SVR4_PIC || ! HAVE_NEWABI) { s_ignore (0); return; } mips_gprel_offset = get_absolute_expression (); demand_empty_rest_of_line (); } /* Handle the .gpword pseudo-op. This is used when generating PIC code. It generates a 32 bit GP relative reloc. */ static void s_gpword (int ignore ATTRIBUTE_UNUSED) { segment_info_type *si; struct insn_label_list *l; expressionS ex; char *p; /* When not generating PIC code, this is treated as .word. */ if (mips_pic != SVR4_PIC) { s_cons (2); return; } si = seg_info (now_seg); l = si->label_list; mips_emit_delays (); if (auto_align) mips_align (2, 0, l); expression (&ex); mips_clear_insn_labels (); if (ex.X_op != O_symbol || ex.X_add_number != 0) { as_bad (_("unsupported use of .gpword")); ignore_rest_of_line (); } p = frag_more (4); md_number_to_chars (p, 0, 4); fix_new_exp (frag_now, p - frag_now->fr_literal, 4, &ex, FALSE, BFD_RELOC_GPREL32); demand_empty_rest_of_line (); } static void s_gpdword (int ignore ATTRIBUTE_UNUSED) { segment_info_type *si; struct insn_label_list *l; expressionS ex; char *p; /* When not generating PIC code, this is treated as .dword. */ if (mips_pic != SVR4_PIC) { s_cons (3); return; } si = seg_info (now_seg); l = si->label_list; mips_emit_delays (); if (auto_align) mips_align (3, 0, l); expression (&ex); mips_clear_insn_labels (); if (ex.X_op != O_symbol || ex.X_add_number != 0) { as_bad (_("unsupported use of .gpdword")); ignore_rest_of_line (); } p = frag_more (8); md_number_to_chars (p, 0, 8); fix_new_exp (frag_now, p - frag_now->fr_literal, 4, &ex, FALSE, BFD_RELOC_GPREL32)->fx_tcbit = 1; /* GPREL32 composed with 64 gives a 64-bit GP offset. */ fix_new (frag_now, p - frag_now->fr_literal, 8, NULL, 0, FALSE, BFD_RELOC_64)->fx_tcbit = 1; demand_empty_rest_of_line (); } /* Handle the .ehword pseudo-op. This is used when generating unwinding tables. It generates a R_MIPS_EH reloc. */ static void s_ehword (int ignore ATTRIBUTE_UNUSED) { expressionS ex; char *p; mips_emit_delays (); expression (&ex); mips_clear_insn_labels (); if (ex.X_op != O_symbol || ex.X_add_number != 0) { as_bad (_("unsupported use of .ehword")); ignore_rest_of_line (); } p = frag_more (4); md_number_to_chars (p, 0, 4); fix_new_exp (frag_now, p - frag_now->fr_literal, 4, &ex, FALSE, BFD_RELOC_32_PCREL); demand_empty_rest_of_line (); } /* Handle the .cpadd pseudo-op. This is used when dealing with switch tables in SVR4 PIC code. */ static void s_cpadd (int ignore ATTRIBUTE_UNUSED) { int reg; file_mips_check_options (); /* This is ignored when not generating SVR4 PIC code. */ if (mips_pic != SVR4_PIC) { s_ignore (0); return; } mips_mark_labels (); mips_assembling_insn = TRUE; /* Add $gp to the register named as an argument. */ macro_start (); reg = tc_get_register (0); macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", reg, reg, mips_gp_register); macro_end (); mips_assembling_insn = FALSE; demand_empty_rest_of_line (); } /* Handle the .insn pseudo-op. This marks instruction labels in mips16/micromips mode. This permits the linker to handle them specially, such as generating jalx instructions when needed. We also make them odd for the duration of the assembly, in order to generate the right sort of code. We will make them even in the adjust_symtab routine, while leaving them marked. This is convenient for the debugger and the disassembler. The linker knows to make them odd again. */ static void s_insn (int ignore ATTRIBUTE_UNUSED) { file_mips_check_options (); file_ase_mips16 |= mips_opts.mips16; file_ase_micromips |= mips_opts.micromips; mips_mark_labels (); demand_empty_rest_of_line (); } /* Handle the .nan pseudo-op. */ static void s_nan (int ignore ATTRIBUTE_UNUSED) { static const char str_legacy[] = "legacy"; static const char str_2008[] = "2008"; size_t i; for (i = 0; !is_end_of_line[(unsigned char) input_line_pointer[i]]; i++); if (i == sizeof (str_2008) - 1 && memcmp (input_line_pointer, str_2008, i) == 0) mips_nan2008 = 1; else if (i == sizeof (str_legacy) - 1 && memcmp (input_line_pointer, str_legacy, i) == 0) { if (ISA_HAS_LEGACY_NAN (file_mips_opts.isa)) mips_nan2008 = 0; else as_bad (_("`%s' does not support legacy NaN"), mips_cpu_info_from_isa (file_mips_opts.isa)->name); } else as_bad (_("bad .nan directive")); input_line_pointer += i; demand_empty_rest_of_line (); } /* Handle a .stab[snd] directive. Ideally these directives would be implemented in a transparent way, so that removing them would not have any effect on the generated instructions. However, s_stab internally changes the section, so in practice we need to decide now whether the preceding label marks compressed code. We do not support changing the compression mode of a label after a .stab* directive, such as in: foo: .stabs ... .set mips16 so the current mode wins. */ static void s_mips_stab (int type) { mips_mark_labels (); s_stab (type); } /* Handle the .weakext pseudo-op as defined in Kane and Heinrich. */ static void s_mips_weakext (int ignore ATTRIBUTE_UNUSED) { char *name; int c; symbolS *symbolP; expressionS exp; c = get_symbol_name (&name); symbolP = symbol_find_or_make (name); S_SET_WEAK (symbolP); *input_line_pointer = c; SKIP_WHITESPACE_AFTER_NAME (); if (! is_end_of_line[(unsigned char) *input_line_pointer]) { if (S_IS_DEFINED (symbolP)) { as_bad (_("ignoring attempt to redefine symbol %s"), S_GET_NAME (symbolP)); ignore_rest_of_line (); return; } if (*input_line_pointer == ',') { ++input_line_pointer; SKIP_WHITESPACE (); } expression (&exp); if (exp.X_op != O_symbol) { as_bad (_("bad .weakext directive")); ignore_rest_of_line (); return; } symbol_set_value_expression (symbolP, &exp); } demand_empty_rest_of_line (); } /* Parse a register string into a number. Called from the ECOFF code to parse .frame. The argument is non-zero if this is the frame register, so that we can record it in mips_frame_reg. */ int tc_get_register (int frame) { unsigned int reg; SKIP_WHITESPACE (); if (! reg_lookup (&input_line_pointer, RWARN | RTYPE_NUM | RTYPE_GP, &reg)) reg = 0; if (frame) { mips_frame_reg = reg != 0 ? reg : SP; mips_frame_reg_valid = 1; mips_cprestore_valid = 0; } return reg; } valueT md_section_align (asection *seg, valueT addr) { int align = bfd_get_section_alignment (stdoutput, seg); /* We don't need to align ELF sections to the full alignment. However, Irix 5 may prefer that we align them at least to a 16 byte boundary. We don't bother to align the sections if we are targeted for an embedded system. */ if (strncmp (TARGET_OS, "elf", 3) == 0) return addr; if (align > 4) align = 4; return ((addr + (1 << align) - 1) & -(1 << align)); } /* Utility routine, called from above as well. If called while the input file is still being read, it's only an approximation. (For example, a symbol may later become defined which appeared to be undefined earlier.) */ static int nopic_need_relax (symbolS *sym, int before_relaxing) { if (sym == 0) return 0; if (g_switch_value > 0) { const char *symname; int change; /* Find out whether this symbol can be referenced off the $gp register. It can be if it is smaller than the -G size or if it is in the .sdata or .sbss section. Certain symbols can not be referenced off the $gp, although it appears as though they can. */ symname = S_GET_NAME (sym); if (symname != (const char *) NULL && (strcmp (symname, "eprol") == 0 || strcmp (symname, "etext") == 0 || strcmp (symname, "_gp") == 0 || strcmp (symname, "edata") == 0 || strcmp (symname, "_fbss") == 0 || strcmp (symname, "_fdata") == 0 || strcmp (symname, "_ftext") == 0 || strcmp (symname, "end") == 0 || strcmp (symname, "_gp_disp") == 0)) change = 1; else if ((! S_IS_DEFINED (sym) || S_IS_COMMON (sym)) && (0 #ifndef NO_ECOFF_DEBUGGING || (symbol_get_obj (sym)->ecoff_extern_size != 0 && (symbol_get_obj (sym)->ecoff_extern_size <= g_switch_value)) #endif /* We must defer this decision until after the whole file has been read, since there might be a .extern after the first use of this symbol. */ || (before_relaxing #ifndef NO_ECOFF_DEBUGGING && symbol_get_obj (sym)->ecoff_extern_size == 0 #endif && S_GET_VALUE (sym) == 0) || (S_GET_VALUE (sym) != 0 && S_GET_VALUE (sym) <= g_switch_value))) change = 0; else { const char *segname; segname = segment_name (S_GET_SEGMENT (sym)); gas_assert (strcmp (segname, ".lit8") != 0 && strcmp (segname, ".lit4") != 0); change = (strcmp (segname, ".sdata") != 0 && strcmp (segname, ".sbss") != 0 && strncmp (segname, ".sdata.", 7) != 0 && strncmp (segname, ".sbss.", 6) != 0 && strncmp (segname, ".gnu.linkonce.sb.", 17) != 0 && strncmp (segname, ".gnu.linkonce.s.", 16) != 0); } return change; } else /* We are not optimizing for the $gp register. */ return 1; } /* Return true if the given symbol should be considered local for SVR4 PIC. */ static bfd_boolean pic_need_relax (symbolS *sym, asection *segtype) { asection *symsec; /* Handle the case of a symbol equated to another symbol. */ while (symbol_equated_reloc_p (sym)) { symbolS *n; /* It's possible to get a loop here in a badly written program. */ n = symbol_get_value_expression (sym)->X_add_symbol; if (n == sym) break; sym = n; } if (symbol_section_p (sym)) return TRUE; symsec = S_GET_SEGMENT (sym); /* This must duplicate the test in adjust_reloc_syms. */ return (!bfd_is_und_section (symsec) && !bfd_is_abs_section (symsec) && !bfd_is_com_section (symsec) && !s_is_linkonce (sym, segtype) /* A global or weak symbol is treated as external. */ && (!S_IS_WEAK (sym) && !S_IS_EXTERNAL (sym))); } /* Given a mips16 variant frag FRAGP, return non-zero if it needs an extended opcode. SEC is the section the frag is in. */ static int mips16_extended_frag (fragS *fragp, asection *sec, long stretch) { int type; const struct mips_int_operand *operand; offsetT val; segT symsec; fragS *sym_frag; if (RELAX_MIPS16_USER_SMALL (fragp->fr_subtype)) return 0; if (RELAX_MIPS16_USER_EXT (fragp->fr_subtype)) return 1; symsec = S_GET_SEGMENT (fragp->fr_symbol); type = RELAX_MIPS16_TYPE (fragp->fr_subtype); operand = mips16_immed_operand (type, FALSE); if (S_FORCE_RELOC (fragp->fr_symbol, TRUE) || (operand->root.type == OP_PCREL ? sec != symsec : !bfd_is_abs_section (symsec))) return 1; sym_frag = symbol_get_frag (fragp->fr_symbol); val = S_GET_VALUE (fragp->fr_symbol) + fragp->fr_offset; if (operand->root.type == OP_PCREL) { const struct mips_pcrel_operand *pcrel_op; addressT addr; offsetT maxtiny; if (RELAX_MIPS16_LONG_BRANCH (fragp->fr_subtype)) return 1; pcrel_op = (const struct mips_pcrel_operand *) operand; /* If the relax_marker of the symbol fragment differs from the relax_marker of this fragment, we have not yet adjusted the symbol fragment fr_address. We want to add in STRETCH in order to get a better estimate of the address. This particularly matters because of the shift bits. */ if (stretch != 0 && sym_frag->relax_marker != fragp->relax_marker) { fragS *f; /* Adjust stretch for any alignment frag. Note that if have been expanding the earlier code, the symbol may be defined in what appears to be an earlier frag. FIXME: This doesn't handle the fr_subtype field, which specifies a maximum number of bytes to skip when doing an alignment. */ for (f = fragp; f != NULL && f != sym_frag; f = f->fr_next) { if (f->fr_type == rs_align || f->fr_type == rs_align_code) { if (stretch < 0) stretch = - ((- stretch) & ~ ((1 << (int) f->fr_offset) - 1)); else stretch &= ~ ((1 << (int) f->fr_offset) - 1); if (stretch == 0) break; } } if (f != NULL) val += stretch; } addr = fragp->fr_address + fragp->fr_fix; /* The base address rules are complicated. The base address of a branch is the following instruction. The base address of a PC relative load or add is the instruction itself, but if it is in a delay slot (in which case it can not be extended) use the address of the instruction whose delay slot it is in. */ if (pcrel_op->include_isa_bit) { addr += 2; /* If we are currently assuming that this frag should be extended, then, the current address is two bytes higher. */ if (RELAX_MIPS16_EXTENDED (fragp->fr_subtype)) addr += 2; /* Ignore the low bit in the target, since it will be set for a text label. */ val &= -2; } else if (RELAX_MIPS16_JAL_DSLOT (fragp->fr_subtype)) addr -= 4; else if (RELAX_MIPS16_DSLOT (fragp->fr_subtype)) addr -= 2; val -= addr & -(1 << pcrel_op->align_log2); /* If any of the shifted bits are set, we must use an extended opcode. If the address depends on the size of this instruction, this can lead to a loop, so we arrange to always use an extended opcode. */ if ((val & ((1 << operand->shift) - 1)) != 0) { fragp->fr_subtype = RELAX_MIPS16_MARK_LONG_BRANCH (fragp->fr_subtype); return 1; } /* If we are about to mark a frag as extended because the value is precisely the next value above maxtiny, then there is a chance of an infinite loop as in the following code: la $4,foo .skip 1020 .align 2 foo: In this case when the la is extended, foo is 0x3fc bytes away, so the la can be shrunk, but then foo is 0x400 away, so the la must be extended. To avoid this loop, we mark the frag as extended if it was small, and is about to become extended with the next value above maxtiny. */ maxtiny = mips_int_operand_max (operand); if (val == maxtiny + (1 << operand->shift) && ! RELAX_MIPS16_EXTENDED (fragp->fr_subtype)) { fragp->fr_subtype = RELAX_MIPS16_MARK_LONG_BRANCH (fragp->fr_subtype); return 1; } } return !mips16_immed_in_range_p (operand, BFD_RELOC_UNUSED, val); } /* Compute the length of a branch sequence, and adjust the RELAX_BRANCH_TOOFAR bit accordingly. If FRAGP is NULL, the worst-case length is computed, with UPDATE being used to indicate whether an unconditional (-1), branch-likely (+1) or regular (0) branch is to be computed. */ static int relaxed_branch_length (fragS *fragp, asection *sec, int update) { bfd_boolean toofar; int length; if (fragp && S_IS_DEFINED (fragp->fr_symbol) && !S_IS_WEAK (fragp->fr_symbol) && sec == S_GET_SEGMENT (fragp->fr_symbol)) { addressT addr; offsetT val; val = S_GET_VALUE (fragp->fr_symbol) + fragp->fr_offset; addr = fragp->fr_address + fragp->fr_fix + 4; val -= addr; toofar = val < - (0x8000 << 2) || val >= (0x8000 << 2); } else /* If the symbol is not defined or it's in a different segment, we emit the long sequence. */ toofar = TRUE; if (fragp && update && toofar != RELAX_BRANCH_TOOFAR (fragp->fr_subtype)) fragp->fr_subtype = RELAX_BRANCH_ENCODE (RELAX_BRANCH_AT (fragp->fr_subtype), RELAX_BRANCH_UNCOND (fragp->fr_subtype), RELAX_BRANCH_LIKELY (fragp->fr_subtype), RELAX_BRANCH_LINK (fragp->fr_subtype), toofar); length = 4; if (toofar) { if (fragp ? RELAX_BRANCH_LIKELY (fragp->fr_subtype) : (update > 0)) length += 8; if (mips_pic != NO_PIC) { /* Additional space for PIC loading of target address. */ length += 8; if (mips_opts.isa == ISA_MIPS1) /* Additional space for $at-stabilizing nop. */ length += 4; } /* If branch is conditional. */ if (fragp ? !RELAX_BRANCH_UNCOND (fragp->fr_subtype) : (update >= 0)) length += 8; } return length; } /* Get a FRAG's branch instruction delay slot size, either from the short-delay-slot bit of a branch-and-link instruction if AL is TRUE, or SHORT_INSN_SIZE otherwise. */ static int frag_branch_delay_slot_size (fragS *fragp, bfd_boolean al, int short_insn_size) { char *buf = fragp->fr_literal + fragp->fr_fix; if (al) return (read_compressed_insn (buf, 4) & 0x02000000) ? 2 : 4; else return short_insn_size; } /* Compute the length of a branch sequence, and adjust the RELAX_MICROMIPS_TOOFAR32 bit accordingly. If FRAGP is NULL, the worst-case length is computed, with UPDATE being used to indicate whether an unconditional (-1), or regular (0) branch is to be computed. */ static int relaxed_micromips_32bit_branch_length (fragS *fragp, asection *sec, int update) { bfd_boolean insn32 = TRUE; bfd_boolean nods = TRUE; bfd_boolean al = TRUE; int short_insn_size; bfd_boolean toofar; int length; if (fragp) { insn32 = RELAX_MICROMIPS_INSN32 (fragp->fr_subtype); nods = RELAX_MICROMIPS_NODS (fragp->fr_subtype); al = RELAX_MICROMIPS_LINK (fragp->fr_subtype); } short_insn_size = insn32 ? 4 : 2; if (fragp && S_IS_DEFINED (fragp->fr_symbol) && !S_IS_WEAK (fragp->fr_symbol) && sec == S_GET_SEGMENT (fragp->fr_symbol)) { addressT addr; offsetT val; val = S_GET_VALUE (fragp->fr_symbol) + fragp->fr_offset; /* Ignore the low bit in the target, since it will be set for a text label. */ if ((val & 1) != 0) --val; addr = fragp->fr_address + fragp->fr_fix + 4; val -= addr; toofar = val < - (0x8000 << 1) || val >= (0x8000 << 1); } else /* If the symbol is not defined or it's in a different segment, we emit the long sequence. */ toofar = TRUE; if (fragp && update && toofar != RELAX_MICROMIPS_TOOFAR32 (fragp->fr_subtype)) fragp->fr_subtype = (toofar ? RELAX_MICROMIPS_MARK_TOOFAR32 (fragp->fr_subtype) : RELAX_MICROMIPS_CLEAR_TOOFAR32 (fragp->fr_subtype)); length = 4; if (toofar) { bfd_boolean compact_known = fragp != NULL; bfd_boolean compact = FALSE; bfd_boolean uncond; if (fragp) { compact = RELAX_MICROMIPS_COMPACT (fragp->fr_subtype); uncond = RELAX_MICROMIPS_UNCOND (fragp->fr_subtype); } else uncond = update < 0; /* If label is out of range, we turn branch <br>: <br> label # 4 bytes 0: into: j label # 4 bytes nop # 2/4 bytes if # compact && (!PIC || insn32) 0: */ if ((mips_pic == NO_PIC || insn32) && (!compact_known || compact)) length += short_insn_size; /* If assembling PIC code, we further turn: j label # 4 bytes into: lw/ld at, %got(label)(gp) # 4 bytes d/addiu at, %lo(label) # 4 bytes jr/c at # 2/4 bytes */ if (mips_pic != NO_PIC) length += 4 + short_insn_size; /* Add an extra nop if the jump has no compact form and we need to fill the delay slot. */ if ((mips_pic == NO_PIC || al) && nods) length += (fragp ? frag_branch_delay_slot_size (fragp, al, short_insn_size) : short_insn_size); /* If branch <br> is conditional, we prepend negated branch <brneg>: <brneg> 0f # 4 bytes nop # 2/4 bytes if !compact */ if (!uncond) length += (compact_known && compact) ? 4 : 4 + short_insn_size; } else if (nods) { /* Add an extra nop to fill the delay slot. */ gas_assert (fragp); length += frag_branch_delay_slot_size (fragp, al, short_insn_size); } return length; } /* Compute the length of a branch, and adjust the RELAX_MICROMIPS_TOOFAR16 bit accordingly. */ static int relaxed_micromips_16bit_branch_length (fragS *fragp, asection *sec, int update) { bfd_boolean toofar; if (fragp && S_IS_DEFINED (fragp->fr_symbol) && !S_IS_WEAK (fragp->fr_symbol) && sec == S_GET_SEGMENT (fragp->fr_symbol)) { addressT addr; offsetT val; int type; val = S_GET_VALUE (fragp->fr_symbol) + fragp->fr_offset; /* Ignore the low bit in the target, since it will be set for a text label. */ if ((val & 1) != 0) --val; /* Assume this is a 2-byte branch. */ addr = fragp->fr_address + fragp->fr_fix + 2; /* We try to avoid the infinite loop by not adding 2 more bytes for long branches. */ val -= addr; type = RELAX_MICROMIPS_TYPE (fragp->fr_subtype); if (type == 'D') toofar = val < - (0x200 << 1) || val >= (0x200 << 1); else if (type == 'E') toofar = val < - (0x40 << 1) || val >= (0x40 << 1); else abort (); } else /* If the symbol is not defined or it's in a different segment, we emit a normal 32-bit branch. */ toofar = TRUE; if (fragp && update && toofar != RELAX_MICROMIPS_TOOFAR16 (fragp->fr_subtype)) fragp->fr_subtype = toofar ? RELAX_MICROMIPS_MARK_TOOFAR16 (fragp->fr_subtype) : RELAX_MICROMIPS_CLEAR_TOOFAR16 (fragp->fr_subtype); if (toofar) return 4; return 2; } /* Estimate the size of a frag before relaxing. Unless this is the mips16, we are not really relaxing here, and the final size is encoded in the subtype information. For the mips16, we have to decide whether we are using an extended opcode or not. */ int md_estimate_size_before_relax (fragS *fragp, asection *segtype) { int change; if (RELAX_BRANCH_P (fragp->fr_subtype)) { fragp->fr_var = relaxed_branch_length (fragp, segtype, FALSE); return fragp->fr_var; } if (RELAX_MIPS16_P (fragp->fr_subtype)) /* We don't want to modify the EXTENDED bit here; it might get us into infinite loops. We change it only in mips_relax_frag(). */ return (RELAX_MIPS16_EXTENDED (fragp->fr_subtype) ? 4 : 2); if (RELAX_MICROMIPS_P (fragp->fr_subtype)) { int length = 4; if (RELAX_MICROMIPS_TYPE (fragp->fr_subtype) != 0) length = relaxed_micromips_16bit_branch_length (fragp, segtype, FALSE); if (length == 4 && RELAX_MICROMIPS_RELAX32 (fragp->fr_subtype)) length = relaxed_micromips_32bit_branch_length (fragp, segtype, FALSE); fragp->fr_var = length; return length; } if (mips_pic == NO_PIC) change = nopic_need_relax (fragp->fr_symbol, 0); else if (mips_pic == SVR4_PIC) change = pic_need_relax (fragp->fr_symbol, segtype); else if (mips_pic == VXWORKS_PIC) /* For vxworks, GOT16 relocations never have a corresponding LO16. */ change = 0; else abort (); if (change) { fragp->fr_subtype |= RELAX_USE_SECOND; return -RELAX_FIRST (fragp->fr_subtype); } else return -RELAX_SECOND (fragp->fr_subtype); } /* This is called to see whether a reloc against a defined symbol should be converted into a reloc against a section. */ int mips_fix_adjustable (fixS *fixp) { if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) return 0; if (fixp->fx_addsy == NULL) return 1; /* Allow relocs used for EH tables. */ if (fixp->fx_r_type == BFD_RELOC_32_PCREL) return 1; /* If symbol SYM is in a mergeable section, relocations of the form SYM + 0 can usually be made section-relative. The mergeable data is then identified by the section offset rather than by the symbol. However, if we're generating REL LO16 relocations, the offset is split between the LO16 and parterning high part relocation. The linker will need to recalculate the complete offset in order to correctly identify the merge data. The linker has traditionally not looked for the parterning high part relocation, and has thus allowed orphaned R_MIPS_LO16 relocations to be placed anywhere. Rather than break backwards compatibility by changing this, it seems better not to force the issue, and instead keep the original symbol. This will work with either linker behavior. */ if ((lo16_reloc_p (fixp->fx_r_type) || reloc_needs_lo_p (fixp->fx_r_type)) && HAVE_IN_PLACE_ADDENDS && (S_GET_SEGMENT (fixp->fx_addsy)->flags & SEC_MERGE) != 0) return 0; /* There is no place to store an in-place offset for JALR relocations. */ if (jalr_reloc_p (fixp->fx_r_type) && HAVE_IN_PLACE_ADDENDS) return 0; /* Likewise an in-range offset of limited PC-relative relocations may overflow the in-place relocatable field if recalculated against the start address of the symbol's containing section. Also, PC relative relocations for MIPS R6 need to be symbol rather than section relative to allow linker relaxations to be performed later on. */ if (limited_pcrel_reloc_p (fixp->fx_r_type) && (HAVE_IN_PLACE_ADDENDS || ISA_IS_R6 (file_mips_opts.isa))) return 0; /* R_MIPS16_26 relocations against non-MIPS16 functions might resolve to a floating-point stub. The same is true for non-R_MIPS16_26 relocations against MIPS16 functions; in this case, the stub becomes the function's canonical address. Floating-point stubs are stored in unique .mips16.call.* or .mips16.fn.* sections. If a stub T for function F is in section S, the first relocation in section S must be against F; this is how the linker determines the target function. All relocations that might resolve to T must also be against F. We therefore have the following restrictions, which are given in an intentionally-redundant way: 1. We cannot reduce R_MIPS16_26 relocations against non-MIPS16 symbols. 2. We cannot reduce a stub's relocations against non-MIPS16 symbols if that stub might be used. 3. We cannot reduce non-R_MIPS16_26 relocations against MIPS16 symbols. 4. We cannot reduce a stub's relocations against MIPS16 symbols if that stub might be used. There is a further restriction: 5. We cannot reduce jump relocations (R_MIPS_26, R_MIPS16_26 or R_MICROMIPS_26_S1) or branch relocations (R_MIPS_PC26_S2, R_MIPS_PC21_S2, R_MIPS_PC16, R_MIPS16_PC16_S1, R_MICROMIPS_PC16_S1, R_MICROMIPS_PC10_S1 or R_MICROMIPS_PC7_S1) against MIPS16 or microMIPS symbols because we need to keep the MIPS16 or microMIPS symbol for the purpose of mode mismatch detection and JAL or BAL to JALX instruction conversion in the linker. For simplicity, we deal with (3)-(4) by not reducing _any_ relocation against a MIPS16 symbol. We deal with (5) by additionally leaving alone any jump and branch relocations against a microMIPS symbol. We deal with (1)-(2) by saying that, if there's a R_MIPS16_26 relocation against some symbol R, no relocation against R may be reduced. (Note that this deals with (2) as well as (1) because relocations against global symbols will never be reduced on ELF targets.) This approach is a little simpler than trying to detect stub sections, and gives the "all or nothing" per-symbol consistency that we have for MIPS16 symbols. */ if (fixp->fx_subsy == NULL && (ELF_ST_IS_MIPS16 (S_GET_OTHER (fixp->fx_addsy)) || (ELF_ST_IS_MICROMIPS (S_GET_OTHER (fixp->fx_addsy)) && (jmp_reloc_p (fixp->fx_r_type) || b_reloc_p (fixp->fx_r_type))) || *symbol_get_tc (fixp->fx_addsy))) return 0; return 1; } /* Translate internal representation of relocation info to BFD target format. */ arelent ** tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) { static arelent *retval[4]; arelent *reloc; bfd_reloc_code_real_type code; memset (retval, 0, sizeof(retval)); reloc = retval[0] = XCNEW (arelent); reloc->sym_ptr_ptr = XNEW (asymbol *); *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; if (fixp->fx_pcrel) { gas_assert (fixp->fx_r_type == BFD_RELOC_16_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_MIPS16_16_PCREL_S1 || fixp->fx_r_type == BFD_RELOC_MICROMIPS_7_PCREL_S1 || fixp->fx_r_type == BFD_RELOC_MICROMIPS_10_PCREL_S1 || fixp->fx_r_type == BFD_RELOC_MICROMIPS_16_PCREL_S1 || fixp->fx_r_type == BFD_RELOC_32_PCREL || fixp->fx_r_type == BFD_RELOC_MIPS_21_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_MIPS_26_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_MIPS_18_PCREL_S3 || fixp->fx_r_type == BFD_RELOC_MIPS_19_PCREL_S2 || fixp->fx_r_type == BFD_RELOC_HI16_S_PCREL || fixp->fx_r_type == BFD_RELOC_LO16_PCREL); /* At this point, fx_addnumber is "symbol offset - pcrel address". Relocations want only the symbol offset. */ switch (fixp->fx_r_type) { case BFD_RELOC_MIPS_18_PCREL_S3: reloc->addend = fixp->fx_addnumber + (reloc->address & ~7); break; default: reloc->addend = fixp->fx_addnumber + reloc->address; break; } } else if (HAVE_IN_PLACE_ADDENDS && fixp->fx_r_type == BFD_RELOC_MICROMIPS_JMP && (read_compressed_insn (fixp->fx_frag->fr_literal + fixp->fx_where, 4) >> 26) == 0x3c) { /* Shift is 2, unusually, for microMIPS JALX. Adjust the in-place addend accordingly. */ reloc->addend = fixp->fx_addnumber >> 1; } else reloc->addend = fixp->fx_addnumber; /* Since the old MIPS ELF ABI uses Rel instead of Rela, encode the vtable entry to be used in the relocation's section offset. */ if (! HAVE_NEWABI && fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) { reloc->address = reloc->addend; reloc->addend = 0; } code = fixp->fx_r_type; reloc->howto = bfd_reloc_type_lookup (stdoutput, code); if (reloc->howto == NULL) { as_bad_where (fixp->fx_file, fixp->fx_line, _("cannot represent %s relocation in this object file" " format"), bfd_get_reloc_code_name (code)); retval[0] = NULL; } return retval; } /* Relax a machine dependent frag. This returns the amount by which the current size of the frag should change. */ int mips_relax_frag (asection *sec, fragS *fragp, long stretch) { if (RELAX_BRANCH_P (fragp->fr_subtype)) { offsetT old_var = fragp->fr_var; fragp->fr_var = relaxed_branch_length (fragp, sec, TRUE); return fragp->fr_var - old_var; } if (RELAX_MICROMIPS_P (fragp->fr_subtype)) { offsetT old_var = fragp->fr_var; offsetT new_var = 4; if (RELAX_MICROMIPS_TYPE (fragp->fr_subtype) != 0) new_var = relaxed_micromips_16bit_branch_length (fragp, sec, TRUE); if (new_var == 4 && RELAX_MICROMIPS_RELAX32 (fragp->fr_subtype)) new_var = relaxed_micromips_32bit_branch_length (fragp, sec, TRUE); fragp->fr_var = new_var; return new_var - old_var; } if (! RELAX_MIPS16_P (fragp->fr_subtype)) return 0; if (mips16_extended_frag (fragp, sec, stretch)) { if (RELAX_MIPS16_EXTENDED (fragp->fr_subtype)) return 0; fragp->fr_subtype = RELAX_MIPS16_MARK_EXTENDED (fragp->fr_subtype); return 2; } else { if (! RELAX_MIPS16_EXTENDED (fragp->fr_subtype)) return 0; fragp->fr_subtype = RELAX_MIPS16_CLEAR_EXTENDED (fragp->fr_subtype); return -2; } return 0; } /* Convert a machine dependent frag. */ void md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) { if (RELAX_BRANCH_P (fragp->fr_subtype)) { char *buf; unsigned long insn; expressionS exp; fixS *fixp; buf = fragp->fr_literal + fragp->fr_fix; insn = read_insn (buf); if (!RELAX_BRANCH_TOOFAR (fragp->fr_subtype)) { /* We generate a fixup instead of applying it right now because, if there are linker relaxations, we're going to need the relocations. */ exp.X_op = O_symbol; exp.X_add_symbol = fragp->fr_symbol; exp.X_add_number = fragp->fr_offset; fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, TRUE, BFD_RELOC_16_PCREL_S2); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; buf = write_insn (buf, insn); } else { int i; as_warn_where (fragp->fr_file, fragp->fr_line, _("relaxed out-of-range branch into a jump")); if (RELAX_BRANCH_UNCOND (fragp->fr_subtype)) goto uncond; if (!RELAX_BRANCH_LIKELY (fragp->fr_subtype)) { /* Reverse the branch. */ switch ((insn >> 28) & 0xf) { case 4: if ((insn & 0xff000000) == 0x47000000 || (insn & 0xff600000) == 0x45600000) { /* BZ.df/BNZ.df, BZ.V/BNZ.V can have the condition reversed by tweaking bit 23. */ insn ^= 0x00800000; } else { /* bc[0-3][tf]l? instructions can have the condition reversed by tweaking a single TF bit, and their opcodes all have 0x4???????. */ gas_assert ((insn & 0xf3e00000) == 0x41000000); insn ^= 0x00010000; } break; case 0: /* bltz 0x04000000 bgez 0x04010000 bltzal 0x04100000 bgezal 0x04110000 */ gas_assert ((insn & 0xfc0e0000) == 0x04000000); insn ^= 0x00010000; break; case 1: /* beq 0x10000000 bne 0x14000000 blez 0x18000000 bgtz 0x1c000000 */ insn ^= 0x04000000; break; default: abort (); } } if (RELAX_BRANCH_LINK (fragp->fr_subtype)) { /* Clear the and-link bit. */ gas_assert ((insn & 0xfc1c0000) == 0x04100000); /* bltzal 0x04100000 bgezal 0x04110000 bltzall 0x04120000 bgezall 0x04130000 */ insn &= ~0x00100000; } /* Branch over the branch (if the branch was likely) or the full jump (not likely case). Compute the offset from the current instruction to branch to. */ if (RELAX_BRANCH_LIKELY (fragp->fr_subtype)) i = 16; else { /* How many bytes in instructions we've already emitted? */ i = buf - fragp->fr_literal - fragp->fr_fix; /* How many bytes in instructions from here to the end? */ i = fragp->fr_var - i; } /* Convert to instruction count. */ i >>= 2; /* Branch counts from the next instruction. */ i--; insn |= i; /* Branch over the jump. */ buf = write_insn (buf, insn); /* nop */ buf = write_insn (buf, 0); if (RELAX_BRANCH_LIKELY (fragp->fr_subtype)) { /* beql $0, $0, 2f */ insn = 0x50000000; /* Compute the PC offset from the current instruction to the end of the variable frag. */ /* How many bytes in instructions we've already emitted? */ i = buf - fragp->fr_literal - fragp->fr_fix; /* How many bytes in instructions from here to the end? */ i = fragp->fr_var - i; /* Convert to instruction count. */ i >>= 2; /* Don't decrement i, because we want to branch over the delay slot. */ insn |= i; buf = write_insn (buf, insn); buf = write_insn (buf, 0); } uncond: if (mips_pic == NO_PIC) { /* j or jal. */ insn = (RELAX_BRANCH_LINK (fragp->fr_subtype) ? 0x0c000000 : 0x08000000); exp.X_op = O_symbol; exp.X_add_symbol = fragp->fr_symbol; exp.X_add_number = fragp->fr_offset; fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, BFD_RELOC_MIPS_JMP); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; buf = write_insn (buf, insn); } else { unsigned long at = RELAX_BRANCH_AT (fragp->fr_subtype); /* lw/ld $at, <sym>($gp) R_MIPS_GOT16 */ insn = HAVE_64BIT_ADDRESSES ? 0xdf800000 : 0x8f800000; insn |= at << OP_SH_RT; exp.X_op = O_symbol; exp.X_add_symbol = fragp->fr_symbol; exp.X_add_number = fragp->fr_offset; if (fragp->fr_offset) { exp.X_add_symbol = make_expr_symbol (&exp); exp.X_add_number = 0; } fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, BFD_RELOC_MIPS_GOT16); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; buf = write_insn (buf, insn); if (mips_opts.isa == ISA_MIPS1) /* nop */ buf = write_insn (buf, 0); /* d/addiu $at, $at, <sym> R_MIPS_LO16 */ insn = HAVE_64BIT_ADDRESSES ? 0x64000000 : 0x24000000; insn |= at << OP_SH_RS | at << OP_SH_RT; fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, BFD_RELOC_LO16); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; buf = write_insn (buf, insn); /* j(al)r $at. */ if (RELAX_BRANCH_LINK (fragp->fr_subtype)) insn = 0x0000f809; else insn = 0x00000008; insn |= at << OP_SH_RS; buf = write_insn (buf, insn); } } fragp->fr_fix += fragp->fr_var; gas_assert (buf == fragp->fr_literal + fragp->fr_fix); return; } /* Relax microMIPS branches. */ if (RELAX_MICROMIPS_P (fragp->fr_subtype)) { char *buf = fragp->fr_literal + fragp->fr_fix; bfd_boolean compact = RELAX_MICROMIPS_COMPACT (fragp->fr_subtype); bfd_boolean insn32 = RELAX_MICROMIPS_INSN32 (fragp->fr_subtype); bfd_boolean nods = RELAX_MICROMIPS_NODS (fragp->fr_subtype); bfd_boolean al = RELAX_MICROMIPS_LINK (fragp->fr_subtype); int type = RELAX_MICROMIPS_TYPE (fragp->fr_subtype); bfd_boolean short_ds; unsigned long insn; expressionS exp; fixS *fixp; exp.X_op = O_symbol; exp.X_add_symbol = fragp->fr_symbol; exp.X_add_number = fragp->fr_offset; fragp->fr_fix += fragp->fr_var; /* Handle 16-bit branches that fit or are forced to fit. */ if (type != 0 && !RELAX_MICROMIPS_TOOFAR16 (fragp->fr_subtype)) { /* We generate a fixup instead of applying it right now, because if there is linker relaxation, we're going to need the relocations. */ if (type == 'D') fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 2, &exp, TRUE, BFD_RELOC_MICROMIPS_10_PCREL_S1); else if (type == 'E') fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 2, &exp, TRUE, BFD_RELOC_MICROMIPS_7_PCREL_S1); else abort (); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; /* These relocations can have an addend that won't fit in 2 octets. */ fixp->fx_no_overflow = 1; return; } /* Handle 32-bit branches that fit or are forced to fit. */ if (!RELAX_MICROMIPS_RELAX32 (fragp->fr_subtype) || !RELAX_MICROMIPS_TOOFAR32 (fragp->fr_subtype)) { /* We generate a fixup instead of applying it right now, because if there is linker relaxation, we're going to need the relocations. */ fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, TRUE, BFD_RELOC_MICROMIPS_16_PCREL_S1); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; if (type == 0) { insn = read_compressed_insn (buf, 4); buf += 4; if (nods) { /* Check the short-delay-slot bit. */ if (!al || (insn & 0x02000000) != 0) buf = write_compressed_insn (buf, 0x0c00, 2); else buf = write_compressed_insn (buf, 0x00000000, 4); } gas_assert (buf == fragp->fr_literal + fragp->fr_fix); return; } } /* Relax 16-bit branches to 32-bit branches. */ if (type != 0) { insn = read_compressed_insn (buf, 2); if ((insn & 0xfc00) == 0xcc00) /* b16 */ insn = 0x94000000; /* beq */ else if ((insn & 0xdc00) == 0x8c00) /* beqz16/bnez16 */ { unsigned long regno; regno = (insn >> MICROMIPSOP_SH_MD) & MICROMIPSOP_MASK_MD; regno = micromips_to_32_reg_d_map [regno]; insn = ((insn & 0x2000) << 16) | 0x94000000; /* beq/bne */ insn |= regno << MICROMIPSOP_SH_RS; } else abort (); /* Nothing else to do, just write it out. */ if (!RELAX_MICROMIPS_RELAX32 (fragp->fr_subtype) || !RELAX_MICROMIPS_TOOFAR32 (fragp->fr_subtype)) { buf = write_compressed_insn (buf, insn, 4); if (nods) buf = write_compressed_insn (buf, 0x0c00, 2); gas_assert (buf == fragp->fr_literal + fragp->fr_fix); return; } } else insn = read_compressed_insn (buf, 4); /* Relax 32-bit branches to a sequence of instructions. */ as_warn_where (fragp->fr_file, fragp->fr_line, _("relaxed out-of-range branch into a jump")); /* Set the short-delay-slot bit. */ short_ds = !al || (insn & 0x02000000) != 0; if (!RELAX_MICROMIPS_UNCOND (fragp->fr_subtype)) { symbolS *l; /* Reverse the branch. */ if ((insn & 0xfc000000) == 0x94000000 /* beq */ || (insn & 0xfc000000) == 0xb4000000) /* bne */ insn ^= 0x20000000; else if ((insn & 0xffe00000) == 0x40000000 /* bltz */ || (insn & 0xffe00000) == 0x40400000 /* bgez */ || (insn & 0xffe00000) == 0x40800000 /* blez */ || (insn & 0xffe00000) == 0x40c00000 /* bgtz */ || (insn & 0xffe00000) == 0x40a00000 /* bnezc */ || (insn & 0xffe00000) == 0x40e00000 /* beqzc */ || (insn & 0xffe00000) == 0x40200000 /* bltzal */ || (insn & 0xffe00000) == 0x40600000 /* bgezal */ || (insn & 0xffe00000) == 0x42200000 /* bltzals */ || (insn & 0xffe00000) == 0x42600000) /* bgezals */ insn ^= 0x00400000; else if ((insn & 0xffe30000) == 0x43800000 /* bc1f */ || (insn & 0xffe30000) == 0x43a00000 /* bc1t */ || (insn & 0xffe30000) == 0x42800000 /* bc2f */ || (insn & 0xffe30000) == 0x42a00000) /* bc2t */ insn ^= 0x00200000; else if ((insn & 0xff000000) == 0x83000000 /* BZ.df BNZ.df */ || (insn & 0xff600000) == 0x81600000) /* BZ.V BNZ.V */ insn ^= 0x00800000; else abort (); if (al) { /* Clear the and-link and short-delay-slot bits. */ gas_assert ((insn & 0xfda00000) == 0x40200000); /* bltzal 0x40200000 bgezal 0x40600000 */ /* bltzals 0x42200000 bgezals 0x42600000 */ insn &= ~0x02200000; } /* Make a label at the end for use with the branch. */ l = symbol_new (micromips_label_name (), asec, fragp->fr_fix, fragp); micromips_label_inc (); S_SET_OTHER (l, ELF_ST_SET_MICROMIPS (S_GET_OTHER (l))); /* Refer to it. */ fixp = fix_new (fragp, buf - fragp->fr_literal, 4, l, 0, TRUE, BFD_RELOC_MICROMIPS_16_PCREL_S1); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; /* Branch over the jump. */ buf = write_compressed_insn (buf, insn, 4); if (!compact) { /* nop */ if (insn32) buf = write_compressed_insn (buf, 0x00000000, 4); else buf = write_compressed_insn (buf, 0x0c00, 2); } } if (mips_pic == NO_PIC) { unsigned long jal = (short_ds || nods ? 0x74000000 : 0xf4000000); /* jal/s */ /* j/jal/jals <sym> R_MICROMIPS_26_S1 */ insn = al ? jal : 0xd4000000; fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, BFD_RELOC_MICROMIPS_JMP); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; buf = write_compressed_insn (buf, insn, 4); if (compact || nods) { /* nop */ if (insn32) buf = write_compressed_insn (buf, 0x00000000, 4); else buf = write_compressed_insn (buf, 0x0c00, 2); } } else { unsigned long at = RELAX_MICROMIPS_AT (fragp->fr_subtype); /* lw/ld $at, <sym>($gp) R_MICROMIPS_GOT16 */ insn = HAVE_64BIT_ADDRESSES ? 0xdc1c0000 : 0xfc1c0000; insn |= at << MICROMIPSOP_SH_RT; if (exp.X_add_number) { exp.X_add_symbol = make_expr_symbol (&exp); exp.X_add_number = 0; } fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, BFD_RELOC_MICROMIPS_GOT16); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; buf = write_compressed_insn (buf, insn, 4); /* d/addiu $at, $at, <sym> R_MICROMIPS_LO16 */ insn = HAVE_64BIT_ADDRESSES ? 0x5c000000 : 0x30000000; insn |= at << MICROMIPSOP_SH_RT | at << MICROMIPSOP_SH_RS; fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, BFD_RELOC_MICROMIPS_LO16); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; buf = write_compressed_insn (buf, insn, 4); if (insn32) { /* jr/jalr $at */ insn = 0x00000f3c | (al ? RA : ZERO) << MICROMIPSOP_SH_RT; insn |= at << MICROMIPSOP_SH_RS; buf = write_compressed_insn (buf, insn, 4); if (compact || nods) /* nop */ buf = write_compressed_insn (buf, 0x00000000, 4); } else { /* jr/jrc/jalr/jalrs $at */ unsigned long jalr = short_ds ? 0x45e0 : 0x45c0; /* jalr/s */ unsigned long jr = compact || nods ? 0x45a0 : 0x4580; /* jr/c */ insn = al ? jalr : jr; insn |= at << MICROMIPSOP_SH_MJ; buf = write_compressed_insn (buf, insn, 2); if (al && nods) { /* nop */ if (short_ds) buf = write_compressed_insn (buf, 0x0c00, 2); else buf = write_compressed_insn (buf, 0x00000000, 4); } } } gas_assert (buf == fragp->fr_literal + fragp->fr_fix); return; } if (RELAX_MIPS16_P (fragp->fr_subtype)) { int type; const struct mips_int_operand *operand; offsetT val; char *buf; unsigned int user_length, length; bfd_boolean need_reloc; unsigned long insn; bfd_boolean ext; segT symsec; type = RELAX_MIPS16_TYPE (fragp->fr_subtype); operand = mips16_immed_operand (type, FALSE); ext = RELAX_MIPS16_EXTENDED (fragp->fr_subtype); val = resolve_symbol_value (fragp->fr_symbol) + fragp->fr_offset; symsec = S_GET_SEGMENT (fragp->fr_symbol); need_reloc = (S_FORCE_RELOC (fragp->fr_symbol, TRUE) || (operand->root.type == OP_PCREL ? asec != symsec : !bfd_is_abs_section (symsec))); if (operand->root.type == OP_PCREL) { const struct mips_pcrel_operand *pcrel_op; addressT addr; pcrel_op = (const struct mips_pcrel_operand *) operand; addr = fragp->fr_address + fragp->fr_fix; /* The rules for the base address of a PC relative reloc are complicated; see mips16_extended_frag. */ if (pcrel_op->include_isa_bit) { if (!need_reloc) { if (!ELF_ST_IS_MIPS16 (S_GET_OTHER (fragp->fr_symbol))) as_bad_where (fragp->fr_file, fragp->fr_line, _("branch to a symbol in another ISA mode")); else if ((fragp->fr_offset & 0x1) != 0) as_bad_where (fragp->fr_file, fragp->fr_line, _("branch to misaligned address (0x%lx)"), (long) val); } addr += 2; if (ext) addr += 2; /* Ignore the low bit in the target, since it will be set for a text label. */ val &= -2; } else if (RELAX_MIPS16_JAL_DSLOT (fragp->fr_subtype)) addr -= 4; else if (RELAX_MIPS16_DSLOT (fragp->fr_subtype)) addr -= 2; addr &= -(1 << pcrel_op->align_log2); val -= addr; /* Make sure the section winds up with the alignment we have assumed. */ if (operand->shift > 0) record_alignment (asec, operand->shift); } if (ext && (RELAX_MIPS16_JAL_DSLOT (fragp->fr_subtype) || RELAX_MIPS16_DSLOT (fragp->fr_subtype))) as_warn_where (fragp->fr_file, fragp->fr_line, _("extended instruction in delay slot")); buf = fragp->fr_literal + fragp->fr_fix; insn = read_compressed_insn (buf, 2); if (ext) insn |= MIPS16_EXTEND; if (RELAX_MIPS16_USER_EXT (fragp->fr_subtype)) user_length = 4; else if (RELAX_MIPS16_USER_SMALL (fragp->fr_subtype)) user_length = 2; else user_length = 0; if (need_reloc) { bfd_reloc_code_real_type reloc = BFD_RELOC_NONE; expressionS exp; fixS *fixp; switch (type) { case 'p': case 'q': reloc = BFD_RELOC_MIPS16_16_PCREL_S1; break; default: as_bad_where (fragp->fr_file, fragp->fr_line, _("unsupported relocation")); break; } if (reloc == BFD_RELOC_NONE) ; else if (ext) { exp.X_op = O_symbol; exp.X_add_symbol = fragp->fr_symbol; exp.X_add_number = fragp->fr_offset; fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 2, &exp, TRUE, reloc); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; /* These relocations can have an addend that won't fit in 2 octets. */ fixp->fx_no_overflow = 1; } else as_bad_where (fragp->fr_file, fragp->fr_line, _("invalid unextended operand value")); } else mips16_immed (fragp->fr_file, fragp->fr_line, type, BFD_RELOC_UNUSED, val, user_length, &insn); length = (ext ? 4 : 2); gas_assert (mips16_opcode_length (insn) == length); write_compressed_insn (buf, insn, length); fragp->fr_fix += length; } else { relax_substateT subtype = fragp->fr_subtype; bfd_boolean second_longer = (subtype & RELAX_SECOND_LONGER) != 0; bfd_boolean use_second = (subtype & RELAX_USE_SECOND) != 0; int first, second; fixS *fixp; first = RELAX_FIRST (subtype); second = RELAX_SECOND (subtype); fixp = (fixS *) fragp->fr_opcode; /* If the delay slot chosen does not match the size of the instruction, then emit a warning. */ if ((!use_second && (subtype & RELAX_DELAY_SLOT_SIZE_FIRST) != 0) || (use_second && (subtype & RELAX_DELAY_SLOT_SIZE_SECOND) != 0)) { relax_substateT s; const char *msg; s = subtype & (RELAX_DELAY_SLOT_16BIT | RELAX_DELAY_SLOT_SIZE_FIRST | RELAX_DELAY_SLOT_SIZE_SECOND); msg = macro_warning (s); if (msg != NULL) as_warn_where (fragp->fr_file, fragp->fr_line, "%s", msg); subtype &= ~s; } /* Possibly emit a warning if we've chosen the longer option. */ if (use_second == second_longer) { relax_substateT s; const char *msg; s = (subtype & (RELAX_SECOND_LONGER | RELAX_NOMACRO | RELAX_DELAY_SLOT)); msg = macro_warning (s); if (msg != NULL) as_warn_where (fragp->fr_file, fragp->fr_line, "%s", msg); subtype &= ~s; } /* Go through all the fixups for the first sequence. Disable them (by marking them as done) if we're going to use the second sequence instead. */ while (fixp && fixp->fx_frag == fragp && fixp->fx_where < fragp->fr_fix - second) { if (subtype & RELAX_USE_SECOND) fixp->fx_done = 1; fixp = fixp->fx_next; } /* Go through the fixups for the second sequence. Disable them if we're going to use the first sequence, otherwise adjust their addresses to account for the relaxation. */ while (fixp && fixp->fx_frag == fragp) { if (subtype & RELAX_USE_SECOND) fixp->fx_where -= first; else fixp->fx_done = 1; fixp = fixp->fx_next; } /* Now modify the frag contents. */ if (subtype & RELAX_USE_SECOND) { char *start; start = fragp->fr_literal + fragp->fr_fix - first - second; memmove (start, start + first, second); fragp->fr_fix -= first; } else fragp->fr_fix -= second; } } /* This function is called after the relocs have been generated. We've been storing mips16 text labels as odd. Here we convert them back to even for the convenience of the debugger. */ void mips_frob_file_after_relocs (void) { asymbol **syms; unsigned int count, i; syms = bfd_get_outsymbols (stdoutput); count = bfd_get_symcount (stdoutput); for (i = 0; i < count; i++, syms++) if (ELF_ST_IS_COMPRESSED (elf_symbol (*syms)->internal_elf_sym.st_other) && ((*syms)->value & 1) != 0) { (*syms)->value &= ~1; /* If the symbol has an odd size, it was probably computed incorrectly, so adjust that as well. */ if ((elf_symbol (*syms)->internal_elf_sym.st_size & 1) != 0) ++elf_symbol (*syms)->internal_elf_sym.st_size; } } /* This function is called whenever a label is defined, including fake labels instantiated off the dot special symbol. It is used when handling branch delays; if a branch has a label, we assume we cannot move it. This also bumps the value of the symbol by 1 in compressed code. */ static void mips_record_label (symbolS *sym) { segment_info_type *si = seg_info (now_seg); struct insn_label_list *l; if (free_insn_labels == NULL) l = XNEW (struct insn_label_list); else { l = free_insn_labels; free_insn_labels = l->next; } l->label = sym; l->next = si->label_list; si->label_list = l; } /* This function is called as tc_frob_label() whenever a label is defined and adds a DWARF-2 record we only want for true labels. */ void mips_define_label (symbolS *sym) { mips_record_label (sym); dwarf2_emit_label (sym); } /* This function is called by tc_new_dot_label whenever a new dot symbol is defined. */ void mips_add_dot_label (symbolS *sym) { mips_record_label (sym); if (mips_assembling_insn && HAVE_CODE_COMPRESSION) mips_compressed_mark_label (sym); } /* Converting ASE flags from internal to .MIPS.abiflags values. */ static unsigned int mips_convert_ase_flags (int ase) { unsigned int ext_ases = 0; if (ase & ASE_DSP) ext_ases |= AFL_ASE_DSP; if (ase & ASE_DSPR2) ext_ases |= AFL_ASE_DSPR2; if (ase & ASE_DSPR3) ext_ases |= AFL_ASE_DSPR3; if (ase & ASE_EVA) ext_ases |= AFL_ASE_EVA; if (ase & ASE_MCU) ext_ases |= AFL_ASE_MCU; if (ase & ASE_MDMX) ext_ases |= AFL_ASE_MDMX; if (ase & ASE_MIPS3D) ext_ases |= AFL_ASE_MIPS3D; if (ase & ASE_MT) ext_ases |= AFL_ASE_MT; if (ase & ASE_SMARTMIPS) ext_ases |= AFL_ASE_SMARTMIPS; if (ase & ASE_VIRT) ext_ases |= AFL_ASE_VIRT; if (ase & ASE_MSA) ext_ases |= AFL_ASE_MSA; if (ase & ASE_XPA) ext_ases |= AFL_ASE_XPA; return ext_ases; } /* Some special processing for a MIPS ELF file. */ void mips_elf_final_processing (void) { int fpabi; Elf_Internal_ABIFlags_v0 flags; flags.version = 0; flags.isa_rev = 0; switch (file_mips_opts.isa) { case INSN_ISA1: flags.isa_level = 1; break; case INSN_ISA2: flags.isa_level = 2; break; case INSN_ISA3: flags.isa_level = 3; break; case INSN_ISA4: flags.isa_level = 4; break; case INSN_ISA5: flags.isa_level = 5; break; case INSN_ISA32: flags.isa_level = 32; flags.isa_rev = 1; break; case INSN_ISA32R2: flags.isa_level = 32; flags.isa_rev = 2; break; case INSN_ISA32R3: flags.isa_level = 32; flags.isa_rev = 3; break; case INSN_ISA32R5: flags.isa_level = 32; flags.isa_rev = 5; break; case INSN_ISA32R6: flags.isa_level = 32; flags.isa_rev = 6; break; case INSN_ISA64: flags.isa_level = 64; flags.isa_rev = 1; break; case INSN_ISA64R2: flags.isa_level = 64; flags.isa_rev = 2; break; case INSN_ISA64R3: flags.isa_level = 64; flags.isa_rev = 3; break; case INSN_ISA64R5: flags.isa_level = 64; flags.isa_rev = 5; break; case INSN_ISA64R6: flags.isa_level = 64; flags.isa_rev = 6; break; } flags.gpr_size = file_mips_opts.gp == 32 ? AFL_REG_32 : AFL_REG_64; flags.cpr1_size = file_mips_opts.soft_float ? AFL_REG_NONE : (file_mips_opts.ase & ASE_MSA) ? AFL_REG_128 : (file_mips_opts.fp == 64) ? AFL_REG_64 : AFL_REG_32; flags.cpr2_size = AFL_REG_NONE; flags.fp_abi = bfd_elf_get_obj_attr_int (stdoutput, OBJ_ATTR_GNU, Tag_GNU_MIPS_ABI_FP); flags.isa_ext = bfd_mips_isa_ext (stdoutput); flags.ases = mips_convert_ase_flags (file_mips_opts.ase); if (file_ase_mips16) flags.ases |= AFL_ASE_MIPS16; if (file_ase_micromips) flags.ases |= AFL_ASE_MICROMIPS; flags.flags1 = 0; if ((ISA_HAS_ODD_SINGLE_FPR (file_mips_opts.isa, file_mips_opts.arch) || file_mips_opts.fp == 64) && file_mips_opts.oddspreg) flags.flags1 |= AFL_FLAGS1_ODDSPREG; flags.flags2 = 0; bfd_mips_elf_swap_abiflags_v0_out (stdoutput, &flags, ((Elf_External_ABIFlags_v0 *) mips_flags_frag)); /* Write out the register information. */ if (mips_abi != N64_ABI) { Elf32_RegInfo s; s.ri_gprmask = mips_gprmask; s.ri_cprmask[0] = mips_cprmask[0]; s.ri_cprmask[1] = mips_cprmask[1]; s.ri_cprmask[2] = mips_cprmask[2]; s.ri_cprmask[3] = mips_cprmask[3]; /* The gp_value field is set by the MIPS ELF backend. */ bfd_mips_elf32_swap_reginfo_out (stdoutput, &s, ((Elf32_External_RegInfo *) mips_regmask_frag)); } else { Elf64_Internal_RegInfo s; s.ri_gprmask = mips_gprmask; s.ri_pad = 0; s.ri_cprmask[0] = mips_cprmask[0]; s.ri_cprmask[1] = mips_cprmask[1]; s.ri_cprmask[2] = mips_cprmask[2]; s.ri_cprmask[3] = mips_cprmask[3]; /* The gp_value field is set by the MIPS ELF backend. */ bfd_mips_elf64_swap_reginfo_out (stdoutput, &s, ((Elf64_External_RegInfo *) mips_regmask_frag)); } /* Set the MIPS ELF flag bits. FIXME: There should probably be some sort of BFD interface for this. */ if (mips_any_noreorder) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_NOREORDER; if (mips_pic != NO_PIC) { elf_elfheader (stdoutput)->e_flags |= EF_MIPS_PIC; elf_elfheader (stdoutput)->e_flags |= EF_MIPS_CPIC; } if (mips_abicalls) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_CPIC; /* Set MIPS ELF flags for ASEs. Note that not all ASEs have flags defined at present; this might need to change in future. */ if (file_ase_mips16) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_ARCH_ASE_M16; if (file_ase_micromips) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_ARCH_ASE_MICROMIPS; if (file_mips_opts.ase & ASE_MDMX) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_ARCH_ASE_MDMX; /* Set the MIPS ELF ABI flags. */ if (mips_abi == O32_ABI && USE_E_MIPS_ABI_O32) elf_elfheader (stdoutput)->e_flags |= E_MIPS_ABI_O32; else if (mips_abi == O64_ABI) elf_elfheader (stdoutput)->e_flags |= E_MIPS_ABI_O64; else if (mips_abi == EABI_ABI) { if (file_mips_opts.gp == 64) elf_elfheader (stdoutput)->e_flags |= E_MIPS_ABI_EABI64; else elf_elfheader (stdoutput)->e_flags |= E_MIPS_ABI_EABI32; } else if (mips_abi == N32_ABI) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_ABI2; /* Nothing to do for N64_ABI. */ if (mips_32bitmode) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_32BITMODE; if (mips_nan2008 == 1) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_NAN2008; /* 32 bit code with 64 bit FP registers. */ fpabi = bfd_elf_get_obj_attr_int (stdoutput, OBJ_ATTR_GNU, Tag_GNU_MIPS_ABI_FP); if (fpabi == Val_GNU_MIPS_ABI_FP_OLD_64) elf_elfheader (stdoutput)->e_flags |= EF_MIPS_FP64; } typedef struct proc { symbolS *func_sym; symbolS *func_end_sym; unsigned long reg_mask; unsigned long reg_offset; unsigned long fpreg_mask; unsigned long fpreg_offset; unsigned long frame_offset; unsigned long frame_reg; unsigned long pc_reg; } procS; static procS cur_proc; static procS *cur_proc_ptr; static int numprocs; /* Implement NOP_OPCODE. We encode a MIPS16 nop as "1", a microMIPS nop as "2", and a normal nop as "0". */ #define NOP_OPCODE_MIPS 0 #define NOP_OPCODE_MIPS16 1 #define NOP_OPCODE_MICROMIPS 2 char mips_nop_opcode (void) { if (seg_info (now_seg)->tc_segment_info_data.micromips) return NOP_OPCODE_MICROMIPS; else if (seg_info (now_seg)->tc_segment_info_data.mips16) return NOP_OPCODE_MIPS16; else return NOP_OPCODE_MIPS; } /* Fill in an rs_align_code fragment. Unlike elsewhere we want to use 32-bit microMIPS NOPs here (if applicable). */ void mips_handle_align (fragS *fragp) { char nop_opcode; char *p; int bytes, size, excess; valueT opcode; if (fragp->fr_type != rs_align_code) return; p = fragp->fr_literal + fragp->fr_fix; nop_opcode = *p; switch (nop_opcode) { case NOP_OPCODE_MICROMIPS: opcode = micromips_nop32_insn.insn_opcode; size = 4; break; case NOP_OPCODE_MIPS16: opcode = mips16_nop_insn.insn_opcode; size = 2; break; case NOP_OPCODE_MIPS: default: opcode = nop_insn.insn_opcode; size = 4; break; } bytes = fragp->fr_next->fr_address - fragp->fr_address - fragp->fr_fix; excess = bytes % size; /* Handle the leading part if we're not inserting a whole number of instructions, and make it the end of the fixed part of the frag. Try to fit in a short microMIPS NOP if applicable and possible, and use zeroes otherwise. */ gas_assert (excess < 4); fragp->fr_fix += excess; switch (excess) { case 3: *p++ = '\0'; /* Fall through. */ case 2: if (nop_opcode == NOP_OPCODE_MICROMIPS && !mips_opts.insn32) { p = write_compressed_insn (p, micromips_nop16_insn.insn_opcode, 2); break; } *p++ = '\0'; /* Fall through. */ case 1: *p++ = '\0'; /* Fall through. */ case 0: break; } md_number_to_chars (p, opcode, size); fragp->fr_var = size; } static long get_number (void) { int negative = 0; long val = 0; if (*input_line_pointer == '-') { ++input_line_pointer; negative = 1; } if (!ISDIGIT (*input_line_pointer)) as_bad (_("expected simple number")); if (input_line_pointer[0] == '0') { if (input_line_pointer[1] == 'x') { input_line_pointer += 2; while (ISXDIGIT (*input_line_pointer)) { val <<= 4; val |= hex_value (*input_line_pointer++); } return negative ? -val : val; } else { ++input_line_pointer; while (ISDIGIT (*input_line_pointer)) { val <<= 3; val |= *input_line_pointer++ - '0'; } return negative ? -val : val; } } if (!ISDIGIT (*input_line_pointer)) { printf (_(" *input_line_pointer == '%c' 0x%02x\n"), *input_line_pointer, *input_line_pointer); as_warn (_("invalid number")); return -1; } while (ISDIGIT (*input_line_pointer)) { val *= 10; val += *input_line_pointer++ - '0'; } return negative ? -val : val; } /* The .file directive; just like the usual .file directive, but there is an initial number which is the ECOFF file index. In the non-ECOFF case .file implies DWARF-2. */ static void s_mips_file (int x ATTRIBUTE_UNUSED) { static int first_file_directive = 0; if (ECOFF_DEBUGGING) { get_number (); s_app_file (0); } else { char *filename; filename = dwarf2_directive_file (0); /* Versions of GCC up to 3.1 start files with a ".file" directive even for stabs output. Make sure that this ".file" is handled. Note that you need a version of GCC after 3.1 in order to support DWARF-2 on MIPS. */ if (filename != NULL && ! first_file_directive) { (void) new_logical_line (filename, -1); s_app_file_string (filename, 0); } first_file_directive = 1; } } /* The .loc directive, implying DWARF-2. */ static void s_mips_loc (int x ATTRIBUTE_UNUSED) { if (!ECOFF_DEBUGGING) dwarf2_directive_loc (0); } /* The .end directive. */ static void s_mips_end (int x ATTRIBUTE_UNUSED) { symbolS *p; /* Following functions need their own .frame and .cprestore directives. */ mips_frame_reg_valid = 0; mips_cprestore_valid = 0; if (!is_end_of_line[(unsigned char) *input_line_pointer]) { p = get_symbol (); demand_empty_rest_of_line (); } else p = NULL; if ((bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE) == 0) as_warn (_(".end not in text section")); if (!cur_proc_ptr) { as_warn (_(".end directive without a preceding .ent directive")); demand_empty_rest_of_line (); return; } if (p != NULL) { gas_assert (S_GET_NAME (p)); if (strcmp (S_GET_NAME (p), S_GET_NAME (cur_proc_ptr->func_sym))) as_warn (_(".end symbol does not match .ent symbol")); if (debug_type == DEBUG_STABS) stabs_generate_asm_endfunc (S_GET_NAME (p), S_GET_NAME (p)); } else as_warn (_(".end directive missing or unknown symbol")); /* Create an expression to calculate the size of the function. */ if (p && cur_proc_ptr) { OBJ_SYMFIELD_TYPE *obj = symbol_get_obj (p); expressionS *exp = XNEW (expressionS); obj->size = exp; exp->X_op = O_subtract; exp->X_add_symbol = symbol_temp_new_now (); exp->X_op_symbol = p; exp->X_add_number = 0; cur_proc_ptr->func_end_sym = exp->X_add_symbol; } /* Generate a .pdr section. */ if (!ECOFF_DEBUGGING && mips_flag_pdr) { segT saved_seg = now_seg; subsegT saved_subseg = now_subseg; expressionS exp; char *fragp; #ifdef md_flush_pending_output md_flush_pending_output (); #endif gas_assert (pdr_seg); subseg_set (pdr_seg, 0); /* Write the symbol. */ exp.X_op = O_symbol; exp.X_add_symbol = p; exp.X_add_number = 0; emit_expr (&exp, 4); fragp = frag_more (7 * 4); md_number_to_chars (fragp, cur_proc_ptr->reg_mask, 4); md_number_to_chars (fragp + 4, cur_proc_ptr->reg_offset, 4); md_number_to_chars (fragp + 8, cur_proc_ptr->fpreg_mask, 4); md_number_to_chars (fragp + 12, cur_proc_ptr->fpreg_offset, 4); md_number_to_chars (fragp + 16, cur_proc_ptr->frame_offset, 4); md_number_to_chars (fragp + 20, cur_proc_ptr->frame_reg, 4); md_number_to_chars (fragp + 24, cur_proc_ptr->pc_reg, 4); subseg_set (saved_seg, saved_subseg); } cur_proc_ptr = NULL; } /* The .aent and .ent directives. */ static void s_mips_ent (int aent) { symbolS *symbolP; symbolP = get_symbol (); if (*input_line_pointer == ',') ++input_line_pointer; SKIP_WHITESPACE (); if (ISDIGIT (*input_line_pointer) || *input_line_pointer == '-') get_number (); if ((bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE) == 0) as_warn (_(".ent or .aent not in text section")); if (!aent && cur_proc_ptr) as_warn (_("missing .end")); if (!aent) { /* This function needs its own .frame and .cprestore directives. */ mips_frame_reg_valid = 0; mips_cprestore_valid = 0; cur_proc_ptr = &cur_proc; memset (cur_proc_ptr, '\0', sizeof (procS)); cur_proc_ptr->func_sym = symbolP; ++numprocs; if (debug_type == DEBUG_STABS) stabs_generate_asm_func (S_GET_NAME (symbolP), S_GET_NAME (symbolP)); } symbol_get_bfdsym (symbolP)->flags |= BSF_FUNCTION; demand_empty_rest_of_line (); } /* The .frame directive. If the mdebug section is present (IRIX 5 native) then ecoff.c (ecoff_directive_frame) is used. For embedded targets, s_mips_frame is used so that we can set the PDR information correctly. We can't use the ecoff routines because they make reference to the ecoff symbol table (in the mdebug section). */ static void s_mips_frame (int ignore ATTRIBUTE_UNUSED) { if (ECOFF_DEBUGGING) s_ignore (ignore); else { long val; if (cur_proc_ptr == (procS *) NULL) { as_warn (_(".frame outside of .ent")); demand_empty_rest_of_line (); return; } cur_proc_ptr->frame_reg = tc_get_register (1); SKIP_WHITESPACE (); if (*input_line_pointer++ != ',' || get_absolute_expression_and_terminator (&val) != ',') { as_warn (_("bad .frame directive")); --input_line_pointer; demand_empty_rest_of_line (); return; } cur_proc_ptr->frame_offset = val; cur_proc_ptr->pc_reg = tc_get_register (0); demand_empty_rest_of_line (); } } /* The .fmask and .mask directives. If the mdebug section is present (IRIX 5 native) then ecoff.c (ecoff_directive_mask) is used. For embedded targets, s_mips_mask is used so that we can set the PDR information correctly. We can't use the ecoff routines because they make reference to the ecoff symbol table (in the mdebug section). */ static void s_mips_mask (int reg_type) { if (ECOFF_DEBUGGING) s_ignore (reg_type); else { long mask, off; if (cur_proc_ptr == (procS *) NULL) { as_warn (_(".mask/.fmask outside of .ent")); demand_empty_rest_of_line (); return; } if (get_absolute_expression_and_terminator (&mask) != ',') { as_warn (_("bad .mask/.fmask directive")); --input_line_pointer; demand_empty_rest_of_line (); return; } off = get_absolute_expression (); if (reg_type == 'F') { cur_proc_ptr->fpreg_mask = mask; cur_proc_ptr->fpreg_offset = off; } else { cur_proc_ptr->reg_mask = mask; cur_proc_ptr->reg_offset = off; } demand_empty_rest_of_line (); } } /* A table describing all the processors gas knows about. Names are matched in the order listed. To ease comparison, please keep this table in the same order as gcc's mips_cpu_info_table[]. */ static const struct mips_cpu_info mips_cpu_info_table[] = { /* Entries for generic ISAs */ { "mips1", MIPS_CPU_IS_ISA, 0, ISA_MIPS1, CPU_R3000 }, { "mips2", MIPS_CPU_IS_ISA, 0, ISA_MIPS2, CPU_R6000 }, { "mips3", MIPS_CPU_IS_ISA, 0, ISA_MIPS3, CPU_R4000 }, { "mips4", MIPS_CPU_IS_ISA, 0, ISA_MIPS4, CPU_R8000 }, { "mips5", MIPS_CPU_IS_ISA, 0, ISA_MIPS5, CPU_MIPS5 }, { "mips32", MIPS_CPU_IS_ISA, 0, ISA_MIPS32, CPU_MIPS32 }, { "mips32r2", MIPS_CPU_IS_ISA, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "mips32r3", MIPS_CPU_IS_ISA, 0, ISA_MIPS32R3, CPU_MIPS32R3 }, { "mips32r5", MIPS_CPU_IS_ISA, 0, ISA_MIPS32R5, CPU_MIPS32R5 }, { "mips32r6", MIPS_CPU_IS_ISA, 0, ISA_MIPS32R6, CPU_MIPS32R6 }, { "mips64", MIPS_CPU_IS_ISA, 0, ISA_MIPS64, CPU_MIPS64 }, { "mips64r2", MIPS_CPU_IS_ISA, 0, ISA_MIPS64R2, CPU_MIPS64R2 }, { "mips64r3", MIPS_CPU_IS_ISA, 0, ISA_MIPS64R3, CPU_MIPS64R3 }, { "mips64r5", MIPS_CPU_IS_ISA, 0, ISA_MIPS64R5, CPU_MIPS64R5 }, { "mips64r6", MIPS_CPU_IS_ISA, 0, ISA_MIPS64R6, CPU_MIPS64R6 }, /* MIPS I */ { "r3000", 0, 0, ISA_MIPS1, CPU_R3000 }, { "r2000", 0, 0, ISA_MIPS1, CPU_R3000 }, { "r3900", 0, 0, ISA_MIPS1, CPU_R3900 }, /* MIPS II */ { "r6000", 0, 0, ISA_MIPS2, CPU_R6000 }, /* MIPS III */ { "r4000", 0, 0, ISA_MIPS3, CPU_R4000 }, { "r4010", 0, 0, ISA_MIPS2, CPU_R4010 }, { "vr4100", 0, 0, ISA_MIPS3, CPU_VR4100 }, { "vr4111", 0, 0, ISA_MIPS3, CPU_R4111 }, { "vr4120", 0, 0, ISA_MIPS3, CPU_VR4120 }, { "vr4130", 0, 0, ISA_MIPS3, CPU_VR4120 }, { "vr4181", 0, 0, ISA_MIPS3, CPU_R4111 }, { "vr4300", 0, 0, ISA_MIPS3, CPU_R4300 }, { "r4400", 0, 0, ISA_MIPS3, CPU_R4400 }, { "r4600", 0, 0, ISA_MIPS3, CPU_R4600 }, { "orion", 0, 0, ISA_MIPS3, CPU_R4600 }, { "r4650", 0, 0, ISA_MIPS3, CPU_R4650 }, { "r5900", 0, 0, ISA_MIPS3, CPU_R5900 }, /* ST Microelectronics Loongson 2E and 2F cores */ { "loongson2e", 0, 0, ISA_MIPS3, CPU_LOONGSON_2E }, { "loongson2f", 0, 0, ISA_MIPS3, CPU_LOONGSON_2F }, /* MIPS IV */ { "r8000", 0, 0, ISA_MIPS4, CPU_R8000 }, { "r10000", 0, 0, ISA_MIPS4, CPU_R10000 }, { "r12000", 0, 0, ISA_MIPS4, CPU_R12000 }, { "r14000", 0, 0, ISA_MIPS4, CPU_R14000 }, { "r16000", 0, 0, ISA_MIPS4, CPU_R16000 }, { "vr5000", 0, 0, ISA_MIPS4, CPU_R5000 }, { "vr5400", 0, 0, ISA_MIPS4, CPU_VR5400 }, { "vr5500", 0, 0, ISA_MIPS4, CPU_VR5500 }, { "rm5200", 0, 0, ISA_MIPS4, CPU_R5000 }, { "rm5230", 0, 0, ISA_MIPS4, CPU_R5000 }, { "rm5231", 0, 0, ISA_MIPS4, CPU_R5000 }, { "rm5261", 0, 0, ISA_MIPS4, CPU_R5000 }, { "rm5721", 0, 0, ISA_MIPS4, CPU_R5000 }, { "rm7000", 0, 0, ISA_MIPS4, CPU_RM7000 }, { "rm9000", 0, 0, ISA_MIPS4, CPU_RM9000 }, /* MIPS 32 */ { "4kc", 0, 0, ISA_MIPS32, CPU_MIPS32 }, { "4km", 0, 0, ISA_MIPS32, CPU_MIPS32 }, { "4kp", 0, 0, ISA_MIPS32, CPU_MIPS32 }, { "4ksc", 0, ASE_SMARTMIPS, ISA_MIPS32, CPU_MIPS32 }, /* MIPS 32 Release 2 */ { "4kec", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "4kem", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "4kep", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "4ksd", 0, ASE_SMARTMIPS, ISA_MIPS32R2, CPU_MIPS32R2 }, { "m4k", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "m4kp", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "m14k", 0, ASE_MCU, ISA_MIPS32R2, CPU_MIPS32R2 }, { "m14kc", 0, ASE_MCU, ISA_MIPS32R2, CPU_MIPS32R2 }, { "m14ke", 0, ASE_DSP | ASE_DSPR2 | ASE_MCU, ISA_MIPS32R2, CPU_MIPS32R2 }, { "m14kec", 0, ASE_DSP | ASE_DSPR2 | ASE_MCU, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kc", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kf2_1", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kf", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kf1_1", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, /* Deprecated forms of the above. */ { "24kfx", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kx", 0, 0, ISA_MIPS32R2, CPU_MIPS32R2 }, /* 24KE is a 24K with DSP ASE, other ASEs are optional. */ { "24kec", 0, ASE_DSP, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kef2_1", 0, ASE_DSP, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kef", 0, ASE_DSP, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kef1_1", 0, ASE_DSP, ISA_MIPS32R2, CPU_MIPS32R2 }, /* Deprecated forms of the above. */ { "24kefx", 0, ASE_DSP, ISA_MIPS32R2, CPU_MIPS32R2 }, { "24kex", 0, ASE_DSP, ISA_MIPS32R2, CPU_MIPS32R2 }, /* 34K is a 24K with DSP and MT ASE, other ASEs are optional. */ { "34kc", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, { "34kf2_1", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, { "34kf", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, { "34kf1_1", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, /* Deprecated forms of the above. */ { "34kfx", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, { "34kx", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, /* 34Kn is a 34kc without DSP. */ { "34kn", 0, ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, /* 74K with DSP and DSPR2 ASE, other ASEs are optional. */ { "74kc", 0, ASE_DSP | ASE_DSPR2, ISA_MIPS32R2, CPU_MIPS32R2 }, { "74kf2_1", 0, ASE_DSP | ASE_DSPR2, ISA_MIPS32R2, CPU_MIPS32R2 }, { "74kf", 0, ASE_DSP | ASE_DSPR2, ISA_MIPS32R2, CPU_MIPS32R2 }, { "74kf1_1", 0, ASE_DSP | ASE_DSPR2, ISA_MIPS32R2, CPU_MIPS32R2 }, { "74kf3_2", 0, ASE_DSP | ASE_DSPR2, ISA_MIPS32R2, CPU_MIPS32R2 }, /* Deprecated forms of the above. */ { "74kfx", 0, ASE_DSP | ASE_DSPR2, ISA_MIPS32R2, CPU_MIPS32R2 }, { "74kx", 0, ASE_DSP | ASE_DSPR2, ISA_MIPS32R2, CPU_MIPS32R2 }, /* 1004K cores are multiprocessor versions of the 34K. */ { "1004kc", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, { "1004kf2_1", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, { "1004kf", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, { "1004kf1_1", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, /* interaptiv is the new name for 1004kf */ { "interaptiv", 0, ASE_DSP | ASE_MT, ISA_MIPS32R2, CPU_MIPS32R2 }, /* M5100 family */ { "m5100", 0, ASE_MCU, ISA_MIPS32R5, CPU_MIPS32R5 }, { "m5101", 0, ASE_MCU, ISA_MIPS32R5, CPU_MIPS32R5 }, /* P5600 with EVA and Virtualization ASEs, other ASEs are optional. */ { "p5600", 0, ASE_VIRT | ASE_EVA | ASE_XPA, ISA_MIPS32R5, CPU_MIPS32R5 }, /* MIPS 64 */ { "5kc", 0, 0, ISA_MIPS64, CPU_MIPS64 }, { "5kf", 0, 0, ISA_MIPS64, CPU_MIPS64 }, { "20kc", 0, ASE_MIPS3D, ISA_MIPS64, CPU_MIPS64 }, { "25kf", 0, ASE_MIPS3D, ISA_MIPS64, CPU_MIPS64 }, /* Broadcom SB-1 CPU core */ { "sb1", 0, ASE_MIPS3D | ASE_MDMX, ISA_MIPS64, CPU_SB1 }, /* Broadcom SB-1A CPU core */ { "sb1a", 0, ASE_MIPS3D | ASE_MDMX, ISA_MIPS64, CPU_SB1 }, { "loongson3a", 0, 0, ISA_MIPS64R2, CPU_LOONGSON_3A }, /* MIPS 64 Release 2 */ /* Cavium Networks Octeon CPU core */ { "octeon", 0, 0, ISA_MIPS64R2, CPU_OCTEON }, { "octeon+", 0, 0, ISA_MIPS64R2, CPU_OCTEONP }, { "octeon2", 0, 0, ISA_MIPS64R2, CPU_OCTEON2 }, { "octeon3", 0, ASE_VIRT | ASE_VIRT64, ISA_MIPS64R5, CPU_OCTEON3 }, /* RMI Xlr */ { "xlr", 0, 0, ISA_MIPS64, CPU_XLR }, /* Broadcom XLP. XLP is mostly like XLR, with the prominent exception that it is MIPS64R2 rather than MIPS64. */ { "xlp", 0, 0, ISA_MIPS64R2, CPU_XLR }, /* MIPS 64 Release 6 */ { "i6400", 0, ASE_MSA, ISA_MIPS64R6, CPU_MIPS64R6}, { "p6600", 0, ASE_VIRT | ASE_MSA, ISA_MIPS64R6, CPU_MIPS64R6}, /* End marker */ { NULL, 0, 0, 0, 0 } }; /* Return true if GIVEN is the same as CANONICAL, or if it is CANONICAL with a final "000" replaced by "k". Ignore case. Note: this function is shared between GCC and GAS. */ static bfd_boolean mips_strict_matching_cpu_name_p (const char *canonical, const char *given) { while (*given != 0 && TOLOWER (*given) == TOLOWER (*canonical)) given++, canonical++; return ((*given == 0 && *canonical == 0) || (strcmp (canonical, "000") == 0 && strcasecmp (given, "k") == 0)); } /* Return true if GIVEN matches CANONICAL, where GIVEN is a user-supplied CPU name. We've traditionally allowed a lot of variation here. Note: this function is shared between GCC and GAS. */ static bfd_boolean mips_matching_cpu_name_p (const char *canonical, const char *given) { /* First see if the name matches exactly, or with a final "000" turned into "k". */ if (mips_strict_matching_cpu_name_p (canonical, given)) return TRUE; /* If not, try comparing based on numerical designation alone. See if GIVEN is an unadorned number, or 'r' followed by a number. */ if (TOLOWER (*given) == 'r') given++; if (!ISDIGIT (*given)) return FALSE; /* Skip over some well-known prefixes in the canonical name, hoping to find a number there too. */ if (TOLOWER (canonical[0]) == 'v' && TOLOWER (canonical[1]) == 'r') canonical += 2; else if (TOLOWER (canonical[0]) == 'r' && TOLOWER (canonical[1]) == 'm') canonical += 2; else if (TOLOWER (canonical[0]) == 'r') canonical += 1; return mips_strict_matching_cpu_name_p (canonical, given); } /* Parse an option that takes the name of a processor as its argument. OPTION is the name of the option and CPU_STRING is the argument. Return the corresponding processor enumeration if the CPU_STRING is recognized, otherwise report an error and return null. A similar function exists in GCC. */ static const struct mips_cpu_info * mips_parse_cpu (const char *option, const char *cpu_string) { const struct mips_cpu_info *p; /* 'from-abi' selects the most compatible architecture for the given ABI: MIPS I for 32-bit ABIs and MIPS III for 64-bit ABIs. For the EABIs, we have to decide whether we're using the 32-bit or 64-bit version. Look first at the -mgp options, if given, otherwise base the choice on MIPS_DEFAULT_64BIT. Treat NO_ABI like the EABIs. One reason to do this is that the plain 'mips' and 'mips64' configs have 'from-abi' as their default architecture. This code picks MIPS I for 'mips' and MIPS III for 'mips64', just as we did in the days before 'from-abi'. */ if (strcasecmp (cpu_string, "from-abi") == 0) { if (ABI_NEEDS_32BIT_REGS (mips_abi)) return mips_cpu_info_from_isa (ISA_MIPS1); if (ABI_NEEDS_64BIT_REGS (mips_abi)) return mips_cpu_info_from_isa (ISA_MIPS3); if (file_mips_opts.gp >= 0) return mips_cpu_info_from_isa (file_mips_opts.gp == 32 ? ISA_MIPS1 : ISA_MIPS3); return mips_cpu_info_from_isa (MIPS_DEFAULT_64BIT ? ISA_MIPS3 : ISA_MIPS1); } /* 'default' has traditionally been a no-op. Probably not very useful. */ if (strcasecmp (cpu_string, "default") == 0) return 0; for (p = mips_cpu_info_table; p->name != 0; p++) if (mips_matching_cpu_name_p (p->name, cpu_string)) return p; as_bad (_("bad value (%s) for %s"), cpu_string, option); return 0; } /* Return the canonical processor information for ISA (a member of the ISA_MIPS* enumeration). */ static const struct mips_cpu_info * mips_cpu_info_from_isa (int isa) { int i; for (i = 0; mips_cpu_info_table[i].name != NULL; i++) if ((mips_cpu_info_table[i].flags & MIPS_CPU_IS_ISA) && isa == mips_cpu_info_table[i].isa) return (&mips_cpu_info_table[i]); return NULL; } static const struct mips_cpu_info * mips_cpu_info_from_arch (int arch) { int i; for (i = 0; mips_cpu_info_table[i].name != NULL; i++) if (arch == mips_cpu_info_table[i].cpu) return (&mips_cpu_info_table[i]); return NULL; } static void show (FILE *stream, const char *string, int *col_p, int *first_p) { if (*first_p) { fprintf (stream, "%24s", ""); *col_p = 24; } else { fprintf (stream, ", "); *col_p += 2; } if (*col_p + strlen (string) > 72) { fprintf (stream, "\n%24s", ""); *col_p = 24; } fprintf (stream, "%s", string); *col_p += strlen (string); *first_p = 0; } void md_show_usage (FILE *stream) { int column, first; size_t i; fprintf (stream, _("\ MIPS options:\n\ -EB generate big endian output\n\ -EL generate little endian output\n\ -g, -g2 do not remove unneeded NOPs or swap branches\n\ -G NUM allow referencing objects up to NUM bytes\n\ implicitly with the gp register [default 8]\n")); fprintf (stream, _("\ -mips1 generate MIPS ISA I instructions\n\ -mips2 generate MIPS ISA II instructions\n\ -mips3 generate MIPS ISA III instructions\n\ -mips4 generate MIPS ISA IV instructions\n\ -mips5 generate MIPS ISA V instructions\n\ -mips32 generate MIPS32 ISA instructions\n\ -mips32r2 generate MIPS32 release 2 ISA instructions\n\ -mips32r3 generate MIPS32 release 3 ISA instructions\n\ -mips32r5 generate MIPS32 release 5 ISA instructions\n\ -mips32r6 generate MIPS32 release 6 ISA instructions\n\ -mips64 generate MIPS64 ISA instructions\n\ -mips64r2 generate MIPS64 release 2 ISA instructions\n\ -mips64r3 generate MIPS64 release 3 ISA instructions\n\ -mips64r5 generate MIPS64 release 5 ISA instructions\n\ -mips64r6 generate MIPS64 release 6 ISA instructions\n\ -march=CPU/-mtune=CPU generate code/schedule for CPU, where CPU is one of:\n")); first = 1; for (i = 0; mips_cpu_info_table[i].name != NULL; i++) show (stream, mips_cpu_info_table[i].name, &column, &first); show (stream, "from-abi", &column, &first); fputc ('\n', stream); fprintf (stream, _("\ -mCPU equivalent to -march=CPU -mtune=CPU. Deprecated.\n\ -no-mCPU don't generate code specific to CPU.\n\ For -mCPU and -no-mCPU, CPU must be one of:\n")); first = 1; show (stream, "3900", &column, &first); show (stream, "4010", &column, &first); show (stream, "4100", &column, &first); show (stream, "4650", &column, &first); fputc ('\n', stream); fprintf (stream, _("\ -mips16 generate mips16 instructions\n\ -no-mips16 do not generate mips16 instructions\n")); fprintf (stream, _("\ -mmicromips generate microMIPS instructions\n\ -mno-micromips do not generate microMIPS instructions\n")); fprintf (stream, _("\ -msmartmips generate smartmips instructions\n\ -mno-smartmips do not generate smartmips instructions\n")); fprintf (stream, _("\ -mdsp generate DSP instructions\n\ -mno-dsp do not generate DSP instructions\n")); fprintf (stream, _("\ -mdspr2 generate DSP R2 instructions\n\ -mno-dspr2 do not generate DSP R2 instructions\n")); fprintf (stream, _("\ -mdspr3 generate DSP R3 instructions\n\ -mno-dspr3 do not generate DSP R3 instructions\n")); fprintf (stream, _("\ -mmt generate MT instructions\n\ -mno-mt do not generate MT instructions\n")); fprintf (stream, _("\ -mmcu generate MCU instructions\n\ -mno-mcu do not generate MCU instructions\n")); fprintf (stream, _("\ -mmsa generate MSA instructions\n\ -mno-msa do not generate MSA instructions\n")); fprintf (stream, _("\ -mxpa generate eXtended Physical Address (XPA) instructions\n\ -mno-xpa do not generate eXtended Physical Address (XPA) instructions\n")); fprintf (stream, _("\ -mvirt generate Virtualization instructions\n\ -mno-virt do not generate Virtualization instructions\n")); fprintf (stream, _("\ -minsn32 only generate 32-bit microMIPS instructions\n\ -mno-insn32 generate all microMIPS instructions\n")); fprintf (stream, _("\ -mfix-loongson2f-jump work around Loongson2F JUMP instructions\n\ -mfix-loongson2f-nop work around Loongson2F NOP errata\n\ -mfix-vr4120 work around certain VR4120 errata\n\ -mfix-vr4130 work around VR4130 mflo/mfhi errata\n\ -mfix-24k insert a nop after ERET and DERET instructions\n\ -mfix-cn63xxp1 work around CN63XXP1 PREF errata\n\ -mgp32 use 32-bit GPRs, regardless of the chosen ISA\n\ -mfp32 use 32-bit FPRs, regardless of the chosen ISA\n\ -msym32 assume all symbols have 32-bit values\n\ -O0 remove unneeded NOPs, do not swap branches\n\ -O remove unneeded NOPs and swap branches\n\ --trap, --no-break trap exception on div by 0 and mult overflow\n\ --break, --no-trap break exception on div by 0 and mult overflow\n")); fprintf (stream, _("\ -mhard-float allow floating-point instructions\n\ -msoft-float do not allow floating-point instructions\n\ -msingle-float only allow 32-bit floating-point operations\n\ -mdouble-float allow 32-bit and 64-bit floating-point operations\n\ --[no-]construct-floats [dis]allow floating point values to be constructed\n\ --[no-]relax-branch [dis]allow out-of-range branches to be relaxed\n\ -mnan=ENCODING select an IEEE 754 NaN encoding convention, either of:\n")); first = 1; show (stream, "legacy", &column, &first); show (stream, "2008", &column, &first); fputc ('\n', stream); fprintf (stream, _("\ -KPIC, -call_shared generate SVR4 position independent code\n\ -call_nonpic generate non-PIC code that can operate with DSOs\n\ -mvxworks-pic generate VxWorks position independent code\n\ -non_shared do not generate code that can operate with DSOs\n\ -xgot assume a 32 bit GOT\n\ -mpdr, -mno-pdr enable/disable creation of .pdr sections\n\ -mshared, -mno-shared disable/enable .cpload optimization for\n\ position dependent (non shared) code\n\ -mabi=ABI create ABI conformant object file for:\n")); first = 1; show (stream, "32", &column, &first); show (stream, "o64", &column, &first); show (stream, "n32", &column, &first); show (stream, "64", &column, &first); show (stream, "eabi", &column, &first); fputc ('\n', stream); fprintf (stream, _("\ -32 create o32 ABI object file (default)\n\ -n32 create n32 ABI object file\n\ -64 create 64 ABI object file\n")); } #ifdef TE_IRIX enum dwarf2_format mips_dwarf2_format (asection *sec ATTRIBUTE_UNUSED) { if (HAVE_64BIT_SYMBOLS) return dwarf2_format_64bit_irix; else return dwarf2_format_32bit; } #endif int mips_dwarf2_addr_size (void) { if (HAVE_64BIT_OBJECTS) return 8; else return 4; } /* Standard calling conventions leave the CFA at SP on entry. */ void mips_cfi_frame_initial_instructions (void) { cfi_add_CFA_def_cfa_register (SP); } int tc_mips_regname_to_dw2regnum (char *regname) { unsigned int regnum = -1; unsigned int reg; if (reg_lookup (&regname, RTYPE_GP | RTYPE_NUM, &reg)) regnum = reg; return regnum; } /* Implement CONVERT_SYMBOLIC_ATTRIBUTE. Given a symbolic attribute NAME, return the proper integer value. Returns -1 if the attribute is not known. */ int mips_convert_symbolic_attribute (const char *name) { static const struct { const char * name; const int tag; } attribute_table[] = { #define T(tag) {#tag, tag} T (Tag_GNU_MIPS_ABI_FP), T (Tag_GNU_MIPS_ABI_MSA), #undef T }; unsigned int i; if (name == NULL) return -1; for (i = 0; i < ARRAY_SIZE (attribute_table); i++) if (streq (name, attribute_table[i].name)) return attribute_table[i].tag; return -1; } void md_mips_end (void) { int fpabi = Val_GNU_MIPS_ABI_FP_ANY; mips_emit_delays (); if (cur_proc_ptr) as_warn (_("missing .end at end of assembly")); /* Just in case no code was emitted, do the consistency check. */ file_mips_check_options (); /* Set a floating-point ABI if the user did not. */ if (obj_elf_seen_attribute (OBJ_ATTR_GNU, Tag_GNU_MIPS_ABI_FP)) { /* Perform consistency checks on the floating-point ABI. */ fpabi = bfd_elf_get_obj_attr_int (stdoutput, OBJ_ATTR_GNU, Tag_GNU_MIPS_ABI_FP); if (fpabi != Val_GNU_MIPS_ABI_FP_ANY) check_fpabi (fpabi); } else { /* Soft-float gets precedence over single-float, the two options should not be used together so this should not matter. */ if (file_mips_opts.soft_float == 1) fpabi = Val_GNU_MIPS_ABI_FP_SOFT; /* Single-float gets precedence over all double_float cases. */ else if (file_mips_opts.single_float == 1) fpabi = Val_GNU_MIPS_ABI_FP_SINGLE; else { switch (file_mips_opts.fp) { case 32: if (file_mips_opts.gp == 32) fpabi = Val_GNU_MIPS_ABI_FP_DOUBLE; break; case 0: fpabi = Val_GNU_MIPS_ABI_FP_XX; break; case 64: if (file_mips_opts.gp == 32 && !file_mips_opts.oddspreg) fpabi = Val_GNU_MIPS_ABI_FP_64A; else if (file_mips_opts.gp == 32) fpabi = Val_GNU_MIPS_ABI_FP_64; else fpabi = Val_GNU_MIPS_ABI_FP_DOUBLE; break; } } bfd_elf_add_obj_attr_int (stdoutput, OBJ_ATTR_GNU, Tag_GNU_MIPS_ABI_FP, fpabi); } } /* Returns the relocation type required for a particular CFI encoding. */ bfd_reloc_code_real_type mips_cfi_reloc_for_encoding (int encoding) { if (encoding == (DW_EH_PE_sdata4 | DW_EH_PE_pcrel)) return BFD_RELOC_32_PCREL; else return BFD_RELOC_NONE; }


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