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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /gas/config/tc-i386.h
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19990502 sourceware importbinu_ss_19990502
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+/* tc-i386.h -- Header file for tc-i386.c
+ Copyright (C) 1989, 92, 93, 94, 95, 96, 97, 1998 Free Software Foundation.
+
+ This file is part of GAS, the GNU Assembler.
+
+ 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 2, 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, 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
+
+#ifndef TC_I386
+#define TC_I386 1
+
+#ifdef ANSI_PROTOTYPES
+struct fix;
+#endif
+
+#define TARGET_BYTES_BIG_ENDIAN 0
+
+#ifdef TE_LYNX
+#define TARGET_FORMAT "coff-i386-lynx"
+#endif
+
+#ifdef BFD_ASSEMBLER
+/* This is used to determine relocation types in tc-i386.c. The first
+ parameter is the current relocation type, the second one is the desired
+ type. The idea is that if the original type is already some kind of PIC
+ relocation, we leave it alone, otherwise we give it the desired type */
+
+#define TC_RELOC(X,Y) (((X) != BFD_RELOC_386_PLT32 && \
+ (X) != BFD_RELOC_386_GOTOFF && \
+ (X) != BFD_RELOC_386_GOT32 && \
+ (X) != BFD_RELOC_386_GOTPC) ? Y : X)
+
+#define tc_fix_adjustable(X) tc_i386_fix_adjustable(X)
+extern int tc_i386_fix_adjustable PARAMS ((struct fix *));
+
+/* This is the relocation type for direct references to GLOBAL_OFFSET_TABLE.
+ * It comes up in complicated expressions such as
+ * _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed normally with
+ * the regular expressions. The fixup specified here when used at runtime
+ * implies that we should add the address of the GOT to the specified location,
+ * and as a result we have simplified the expression into something we can use.
+ */
+#define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_386_GOTPC
+
+/* This expression evaluates to false if the relocation is for a local object
+ for which we still want to do the relocation at runtime. True if we
+ are willing to perform this relocation while building the .o file.
+ This is only used for pcrel relocations, so GOTOFF does not need to be
+ checked here. I am not sure if some of the others are ever used with
+ pcrel, but it is easier to be safe than sorry. */
+
+#define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \
+ ((FIX)->fx_r_type != BFD_RELOC_386_PLT32 \
+ && (FIX)->fx_r_type != BFD_RELOC_386_GOT32 \
+ && (FIX)->fx_r_type != BFD_RELOC_386_GOTPC \
+ && ((FIX)->fx_addsy == NULL \
+ || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \
+ && ! S_IS_WEAK ((FIX)->fx_addsy) \
+ && S_IS_DEFINED ((FIX)->fx_addsy) \
+ && ! S_IS_COMMON ((FIX)->fx_addsy))))
+
+#define TARGET_ARCH bfd_arch_i386
+
+#ifdef OBJ_AOUT
+#ifdef TE_NetBSD
+#define TARGET_FORMAT "a.out-i386-netbsd"
+#endif
+#ifdef TE_386BSD
+#define TARGET_FORMAT "a.out-i386-bsd"
+#endif
+#ifdef TE_LINUX
+#define TARGET_FORMAT "a.out-i386-linux"
+#endif
+#ifdef TE_Mach
+#define TARGET_FORMAT "a.out-mach3"
+#endif
+#ifdef TE_DYNIX
+#define TARGET_FORMAT "a.out-i386-dynix"
+#endif
+#ifndef TARGET_FORMAT
+#define TARGET_FORMAT "a.out-i386"
+#endif
+#endif /* OBJ_AOUT */
+
+#ifdef OBJ_ELF
+#define TARGET_FORMAT "elf32-i386"
+#endif
+
+#ifdef OBJ_MAYBE_ELF
+#ifdef OBJ_MAYBE_COFF
+extern const char *i386_target_format PARAMS ((void));
+#define TARGET_FORMAT i386_target_format ()
+#endif
+#endif
+
+#else /* ! BFD_ASSEMBLER */
+
+/* COFF STUFF */
+
+#define COFF_MAGIC I386MAGIC
+#define BFD_ARCH bfd_arch_i386
+#define COFF_FLAGS F_AR32WR
+#define TC_COUNT_RELOC(x) ((x)->fx_addsy || (x)->fx_r_type==7)
+#define TC_COFF_FIX2RTYPE(fixP) tc_coff_fix2rtype(fixP)
+extern short tc_coff_fix2rtype PARAMS ((struct fix *));
+#define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag)
+extern int tc_coff_sizemachdep PARAMS ((fragS *frag));
+#define SUB_SEGMENT_ALIGN(SEG) 2
+#define TC_RVA_RELOC 7
+/* Need this for PIC relocations */
+#define NEED_FX_R_TYPE
+
+
+#ifdef TE_386BSD
+/* The BSDI linker apparently rejects objects with a machine type of
+ M_386 (100). */
+#define AOUT_MACHTYPE 0
+#else
+#define AOUT_MACHTYPE 100
+#endif
+
+#undef REVERSE_SORT_RELOCS
+
+#endif /* ! BFD_ASSEMBLER */
+
+#define TC_FORCE_RELOCATION(fixp) tc_i386_force_relocation(fixp)
+extern int tc_i386_force_relocation PARAMS ((struct fix *));
+
+#ifdef BFD_ASSEMBLER
+#define NO_RELOC BFD_RELOC_NONE
+#else
+#define NO_RELOC 0
+#endif
+#define tc_coff_symbol_emit_hook(a) ; /* not used */
+
+#ifndef BFD_ASSEMBLER
+#ifndef OBJ_AOUT
+#ifndef TE_PE
+#ifndef TE_GO32
+/* Local labels starts with .L */
+#define LOCAL_LABEL(name) (name[0] == '.' \
+ && (name[1] == 'L' || name[1] == 'X' || name[1] == '.'))
+#endif
+#endif
+#endif
+#endif
+
+#define LOCAL_LABELS_FB 1
+
+#define tc_aout_pre_write_hook(x) {;} /* not used */
+#define tc_crawl_symbol_chain(a) {;} /* not used */
+#define tc_headers_hook(a) {;} /* not used */
+
+extern const char extra_symbol_chars[];
+#define tc_symbol_chars extra_symbol_chars
+
+#define MAX_OPERANDS 3 /* max operands per insn */
+#define MAX_IMMEDIATE_OPERANDS 2/* max immediates per insn (lcall, ljmp) */
+#define MAX_MEMORY_OPERANDS 2 /* max memory refs per insn (string ops) */
+
+/* Prefixes will be emitted in the order defined below.
+ WAIT_PREFIX must be the first prefix since FWAIT is really is an
+ instruction, and so must come before any prefixes. */
+#define WAIT_PREFIX 0
+#define LOCKREP_PREFIX 1
+#define ADDR_PREFIX 2
+#define DATA_PREFIX 3
+#define SEG_PREFIX 4
+#define MAX_PREFIXES 5 /* max prefixes per opcode */
+
+/* we define the syntax here (modulo base,index,scale syntax) */
+#define REGISTER_PREFIX '%'
+#define IMMEDIATE_PREFIX '$'
+#define ABSOLUTE_PREFIX '*'
+
+#define TWO_BYTE_OPCODE_ESCAPE 0x0f
+#define NOP_OPCODE (char) 0x90
+
+/* register numbers */
+#define EBP_REG_NUM 5
+#define ESP_REG_NUM 4
+
+/* modrm_byte.regmem for twobyte escape */
+#define ESCAPE_TO_TWO_BYTE_ADDRESSING ESP_REG_NUM
+/* index_base_byte.index for no index register addressing */
+#define NO_INDEX_REGISTER ESP_REG_NUM
+/* index_base_byte.base for no base register addressing */
+#define NO_BASE_REGISTER EBP_REG_NUM
+#define NO_BASE_REGISTER_16 6
+
+/* these are the instruction mnemonic suffixes. */
+#define DWORD_MNEM_SUFFIX 'l'
+#define WORD_MNEM_SUFFIX 'w'
+#define BYTE_MNEM_SUFFIX 'b'
+#define SHORT_MNEM_SUFFIX 's'
+#define LONG_MNEM_SUFFIX 'l'
+/* Intel Syntax */
+#define LONG_DOUBLE_MNEM_SUFFIX 'x'
+/* Intel Syntax */
+#define INTEL_DWORD_MNEM_SUFFIX 'd'
+
+/* modrm.mode = REGMEM_FIELD_HAS_REG when a register is in there */
+#define REGMEM_FIELD_HAS_REG 0x3/* always = 0x3 */
+#define REGMEM_FIELD_HAS_MEM (~REGMEM_FIELD_HAS_REG)
+
+#define END_OF_INSN '\0'
+
+/* Intel Syntax */
+/* Values 0-4 map onto scale factor */
+#define BYTE_PTR 0
+#define WORD_PTR 1
+#define DWORD_PTR 2
+#define QWORD_PTR 3
+#define XWORD_PTR 4
+#define SHORT 5
+#define OFFSET_FLAT 6
+#define FLAT 7
+#define NONE_FOUND 8
+/*
+ When an operand is read in it is classified by its type. This type includes
+ all the possible ways an operand can be used. Thus, '%eax' is both 'register
+ # 0' and 'The Accumulator'. In our language this is expressed by OR'ing
+ 'Reg32' (any 32 bit register) and 'Acc' (the accumulator).
+ Operands are classified so that we can match given operand types with
+ the opcode table in opcode/i386.h.
+ */
+/* register */
+#define Reg8 0x1 /* 8 bit reg */
+#define Reg16 0x2 /* 16 bit reg */
+#define Reg32 0x4 /* 32 bit reg */
+/* immediate */
+#define Imm8 0x8 /* 8 bit immediate */
+#define Imm8S 0x10 /* 8 bit immediate sign extended */
+#define Imm16 0x20 /* 16 bit immediate */
+#define Imm32 0x40 /* 32 bit immediate */
+#define Imm1 0x80 /* 1 bit immediate */
+/* memory */
+#define BaseIndex 0x100
+/* Disp8,16,32 are used in different ways, depending on the
+ instruction. For jumps, they specify the size of the PC relative
+ displacement, for baseindex type instructions, they specify the
+ size of the offset relative to the base register, and for memory
+ offset instructions such as `mov 1234,%al' they specify the size of
+ the offset relative to the segment base. */
+#define Disp8 0x200 /* 8 bit displacement */
+#define Disp16 0x400 /* 16 bit displacement */
+#define Disp32 0x800 /* 32 bit displacement */
+/* specials */
+#define InOutPortReg 0x1000 /* register to hold in/out port addr = dx */
+#define ShiftCount 0x2000 /* register to hold shift cound = cl */
+#define Control 0x4000 /* Control register */
+#define Debug 0x8000 /* Debug register */
+#define Test 0x10000 /* Test register */
+#define FloatReg 0x20000 /* Float register */
+#define FloatAcc 0x40000 /* Float stack top %st(0) */
+#define SReg2 0x80000 /* 2 bit segment register */
+#define SReg3 0x100000 /* 3 bit segment register */
+#define Acc 0x200000 /* Accumulator %al or %ax or %eax */
+#define JumpAbsolute 0x400000
+#define RegMMX 0x800000 /* MMX register */
+#define EsSeg 0x1000000 /* String insn operand with fixed es segment */
+
+#define Reg (Reg8|Reg16|Reg32) /* gen'l register */
+#define WordReg (Reg16|Reg32)
+#define ImplicitRegister (InOutPortReg|ShiftCount|Acc|FloatAcc)
+#define Imm (Imm8|Imm8S|Imm16|Imm32) /* gen'l immediate */
+#define Disp (Disp8|Disp16|Disp32) /* General displacement */
+#define AnyMem (Disp|BaseIndex) /* General memory */
+/* The following aliases are defined because the opcode table
+ carefully specifies the allowed memory types for each instruction.
+ At the moment we can only tell a memory reference size by the
+ instruction suffix, so there's not much point in defining Mem8,
+ Mem16, Mem32 and Mem64 opcode modifiers - We might as well just use
+ the suffix directly to check memory operands. */
+#define LLongMem AnyMem /* 64 bits (or more) */
+#define LongMem AnyMem /* 32 bit memory ref */
+#define ShortMem AnyMem /* 16 bit memory ref */
+#define WordMem AnyMem /* 16 or 32 bit memory ref */
+#define ByteMem AnyMem /* 8 bit memory ref */
+
+#define SMALLEST_DISP_TYPE(num) \
+ (fits_in_signed_byte(num) ? (Disp8|Disp32) : Disp32)
+
+typedef struct
+{
+ /* instruction name sans width suffix ("mov" for movl insns) */
+ char *name;
+
+ /* how many operands */
+ unsigned int operands;
+
+ /* base_opcode is the fundamental opcode byte without optional
+ prefix(es). */
+ unsigned int base_opcode;
+
+ /* extension_opcode is the 3 bit extension for group <n> insns.
+ This field is also used to store the 8-bit opcode suffix for the
+ AMD 3DNow! instructions.
+ If this template has no extension opcode (the usual case) use None */
+ unsigned int extension_opcode;
+#define None 0xffff /* If no extension_opcode is possible. */
+
+ /* the bits in opcode_modifier are used to generate the final opcode from
+ the base_opcode. These bits also are used to detect alternate forms of
+ the same instruction */
+ unsigned int opcode_modifier;
+
+ /* opcode_modifier bits: */
+#define W 0x1 /* set if operands can be words or dwords
+ encoded the canonical way */
+#define D 0x2 /* D = 0 if Reg --> Regmem;
+ D = 1 if Regmem --> Reg: MUST BE 0x2 */
+#define Modrm 0x4
+#define ReverseRegRegmem 0x8 /* swap reg,regmem fields for 2 reg case */
+#define FloatR 0x8 /* src/dest swap for floats: MUST BE 0x8 */
+#define ShortForm 0x10 /* register is in low 3 bits of opcode */
+#define FloatMF 0x20 /* FP insn memory format bit, sized by 0x4 */
+#define Jump 0x40 /* special case for jump insns. */
+#define JumpDword 0x80 /* call and jump */
+#define JumpByte 0x100 /* loop and jecxz */
+#define JumpInterSegment 0x200 /* special case for intersegment leaps/calls */
+#define FloatD 0x400 /* direction for float insns: MUST BE 0x400 */
+#define Seg2ShortForm 0x800 /* encoding of load segment reg insns */
+#define Seg3ShortForm 0x1000 /* fs/gs segment register insns. */
+#define Size16 0x2000 /* needs size prefix if in 32-bit mode */
+#define Size32 0x4000 /* needs size prefix if in 16-bit mode */
+#define IgnoreSize 0x8000 /* instruction ignores operand size prefix */
+#define No_bSuf 0x10000 /* b suffix on instruction illegal */
+#define No_wSuf 0x20000 /* w suffix on instruction illegal */
+#define No_lSuf 0x40000 /* l suffix on instruction illegal */
+#define No_sSuf 0x80000 /* s suffix on instruction illegal */
+#define FWait 0x100000 /* instruction needs FWAIT */
+#define IsString 0x200000 /* quick test for string instructions */
+#define regKludge 0x400000 /* fake an extra reg operand for clr, imul */
+#define IsPrefix 0x800000 /* opcode is a prefix */
+#define No_dSuf 0x1000000 /* d suffix on instruction illegal */
+#define No_xSuf 0x2000000 /* x suffix on instruction illegal */
+#define Ugh 0x80000000 /* deprecated fp insn, gets a warning */
+
+ /* operand_types[i] describes the type of operand i. This is made
+ by OR'ing together all of the possible type masks. (e.g.
+ 'operand_types[i] = Reg|Imm' specifies that operand i can be
+ either a register or an immediate operand */
+ unsigned int operand_types[3];
+}
+template;
+
+/*
+ 'templates' is for grouping together 'template' structures for opcodes
+ of the same name. This is only used for storing the insns in the grand
+ ole hash table of insns.
+ The templates themselves start at START and range up to (but not including)
+ END.
+ */
+typedef struct
+ {
+ const template *start;
+ const template *end;
+ } templates;
+
+/* these are for register name --> number & type hash lookup */
+typedef struct
+ {
+ char *reg_name;
+ unsigned int reg_type;
+ unsigned int reg_num;
+ }
+reg_entry;
+
+typedef struct
+ {
+ char *seg_name;
+ unsigned int seg_prefix;
+ }
+seg_entry;
+
+/* 386 operand encoding bytes: see 386 book for details of this. */
+typedef struct
+ {
+ unsigned int regmem; /* codes register or memory operand */
+ unsigned int reg; /* codes register operand (or extended opcode) */
+ unsigned int mode; /* how to interpret regmem & reg */
+ }
+modrm_byte;
+
+/* 386 opcode byte to code indirect addressing. */
+typedef struct
+ {
+ unsigned base;
+ unsigned index;
+ unsigned scale;
+ }
+sib_byte;
+
+/* The name of the global offset table generated by the compiler. Allow
+ this to be overridden if need be. */
+#ifndef GLOBAL_OFFSET_TABLE_NAME
+#define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
+#endif
+
+#ifdef BFD_ASSEMBLER
+void i386_validate_fix PARAMS ((struct fix *));
+#define TC_VALIDATE_FIX(FIXP,SEGTYPE,SKIP) i386_validate_fix(FIXP)
+#endif
+
+#endif /* TC_I386 */
+
+#define md_operand(x)
+
+extern const struct relax_type md_relax_table[];
+#define TC_GENERIC_RELAX_TABLE md_relax_table
+
+
+extern int flag_16bit_code;
+
+#ifdef BFD_ASSEMBLER
+#define md_maybe_text() \
+ ((bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE) != 0)
+#else
+#define md_maybe_text() \
+ (now_seg != data_section && now_seg != bss_section)
+#endif
+
+#define md_do_align(n, fill, len, max, around) \
+if ((n) && !need_pass_2 \
+ && (!(fill) || ((char)*(fill) == (char)0x90 && (len) == 1)) \
+ && md_maybe_text ()) \
+ { \
+ char *p; \
+ p = frag_var (rs_align_code, 15, 1, (relax_substateT) max, \
+ (symbolS *) 0, (offsetT) (n), (char *) 0); \
+ *p = 0x90; \
+ goto around; \
+ }
+
+extern void i386_align_code PARAMS ((fragS *, int));
+
+#define HANDLE_ALIGN(fragP) \
+if (fragP->fr_type == rs_align_code) \
+ i386_align_code (fragP, (fragP->fr_next->fr_address \
+ - fragP->fr_address \
+ - fragP->fr_fix));
+
+/* call md_apply_fix3 with segment instead of md_apply_fix */
+#define MD_APPLY_FIX3
+
+void i386_print_statistics PARAMS ((FILE *));
+#define tc_print_statistics i386_print_statistics
+
+#define md_number_to_chars number_to_chars_littleendian
+
+#ifdef SCO_ELF
+#define tc_init_after_args() sco_id ()
+extern void sco_id PARAMS ((void));
+#endif
+
+#define DIFF_EXPR_OK /* foo-. gets turned into PC relative relocs */
+
+/* end of tc-i386.h */