diff options
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/obj-elf.c | 4 | ||||
| -rw-r--r-- | gas/config/tc-mep.c | 1886 | ||||
| -rw-r--r-- | gas/config/tc-mep.h | 119 |
3 files changed, 2009 insertions, 0 deletions
diff --git a/gas/config/obj-elf.c b/gas/config/obj-elf.c index a9d34c4..f083733 100644 --- a/gas/config/obj-elf.c +++ b/gas/config/obj-elf.c @@ -57,6 +57,10 @@ #include "elf/x86-64.h" #endif +#ifdef TC_MEP +#include "elf/mep.h" +#endif + static void obj_elf_line (int); static void obj_elf_size (int); static void obj_elf_type (int); diff --git a/gas/config/tc-mep.c b/gas/config/tc-mep.c new file mode 100644 index 0000000..b3b17d3 --- /dev/null +++ b/gas/config/tc-mep.c @@ -0,0 +1,1886 @@ +/* tc-mep.c -- Assembler for the Toshiba Media Processor. + Copyright (C) 2001, 2002, 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ + +#include <stdio.h> +#include "as.h" +#include "dwarf2dbg.h" +#include "subsegs.h" +#include "symcat.h" +#include "opcodes/mep-desc.h" +#include "opcodes/mep-opc.h" +#include "cgen.h" +#include "elf/common.h" +#include "elf/mep.h" +#include "libbfd.h" +#include "xregex.h" + +/* Structure to hold all of the different components describing + an individual instruction. */ +typedef struct +{ + const CGEN_INSN * insn; + const CGEN_INSN * orig_insn; + CGEN_FIELDS fields; +#if CGEN_INT_INSN_P + CGEN_INSN_INT buffer [1]; +#define INSN_VALUE(buf) (*(buf)) +#else + unsigned char buffer [CGEN_MAX_INSN_SIZE]; +#define INSN_VALUE(buf) (buf) +#endif + char * addr; + fragS * frag; + int num_fixups; + fixS * fixups [GAS_CGEN_MAX_FIXUPS]; + int indices [MAX_OPERAND_INSTANCES]; +} mep_insn; + +static int mode = CORE; /* Start in core mode. */ +static int pluspresent = 0; +static int allow_disabled_registers = 0; +static int library_flag = 0; + +/* We're going to need to store all of the instructions along with + their fixups so that we can parallelization grouping rules. */ + +static mep_insn saved_insns[MAX_SAVED_FIXUP_CHAINS]; +static int num_insns_saved = 0; + +const char comment_chars[] = "#"; +const char line_comment_chars[] = ";#"; +const char line_separator_chars[] = ";"; +const char EXP_CHARS[] = "eE"; +const char FLT_CHARS[] = "dD"; + +static void mep_switch_to_vliw_mode (int); +static void mep_switch_to_core_mode (int); +static void mep_s_vtext (int); +static void mep_noregerr (int); + +/* The target specific pseudo-ops which we support. */ +const pseudo_typeS md_pseudo_table[] = +{ + { "word", cons, 4 }, + { "file", (void (*) (int)) dwarf2_directive_file, 0 }, + { "loc", dwarf2_directive_loc, 0 }, + { "vliw", mep_switch_to_vliw_mode, 0 }, + { "core", mep_switch_to_core_mode, 0 }, + { "vtext", mep_s_vtext, 0 }, + { "noregerr", mep_noregerr, 0 }, + { NULL, NULL, 0 } +}; + +/* Relocations against symbols are 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 mep_hi_fixup +{ + struct mep_hi_fixup * next; /* Next HI fixup. */ + fixS * fixp; /* This fixup. */ + segT seg; /* The section this fixup is in. */ +}; + +/* The list of unmatched HI relocs. */ +static struct mep_hi_fixup * mep_hi_fixup_list; + + +#define OPTION_EB (OPTION_MD_BASE + 0) +#define OPTION_EL (OPTION_MD_BASE + 1) +#define OPTION_CONFIG (OPTION_MD_BASE + 2) +#define OPTION_AVERAGE (OPTION_MD_BASE + 3) +#define OPTION_NOAVERAGE (OPTION_MD_BASE + 4) +#define OPTION_MULT (OPTION_MD_BASE + 5) +#define OPTION_NOMULT (OPTION_MD_BASE + 6) +#define OPTION_DIV (OPTION_MD_BASE + 7) +#define OPTION_NODIV (OPTION_MD_BASE + 8) +#define OPTION_BITOPS (OPTION_MD_BASE + 9) +#define OPTION_NOBITOPS (OPTION_MD_BASE + 10) +#define OPTION_LEADZ (OPTION_MD_BASE + 11) +#define OPTION_NOLEADZ (OPTION_MD_BASE + 12) +#define OPTION_ABSDIFF (OPTION_MD_BASE + 13) +#define OPTION_NOABSDIFF (OPTION_MD_BASE + 14) +#define OPTION_MINMAX (OPTION_MD_BASE + 15) +#define OPTION_NOMINMAX (OPTION_MD_BASE + 16) +#define OPTION_CLIP (OPTION_MD_BASE + 17) +#define OPTION_NOCLIP (OPTION_MD_BASE + 18) +#define OPTION_SATUR (OPTION_MD_BASE + 19) +#define OPTION_NOSATUR (OPTION_MD_BASE + 20) +#define OPTION_COP32 (OPTION_MD_BASE + 21) +#define OPTION_REPEAT (OPTION_MD_BASE + 25) +#define OPTION_NOREPEAT (OPTION_MD_BASE + 26) +#define OPTION_DEBUG (OPTION_MD_BASE + 27) +#define OPTION_NODEBUG (OPTION_MD_BASE + 28) +#define OPTION_LIBRARY (OPTION_MD_BASE + 29) + +struct option md_longopts[] = { + { "EB", no_argument, NULL, OPTION_EB}, + { "EL", no_argument, NULL, OPTION_EL}, + { "mconfig", required_argument, NULL, OPTION_CONFIG}, + { "maverage", no_argument, NULL, OPTION_AVERAGE}, + { "mno-average", no_argument, NULL, OPTION_NOAVERAGE}, + { "mmult", no_argument, NULL, OPTION_MULT}, + { "mno-mult", no_argument, NULL, OPTION_NOMULT}, + { "mdiv", no_argument, NULL, OPTION_DIV}, + { "mno-div", no_argument, NULL, OPTION_NODIV}, + { "mbitops", no_argument, NULL, OPTION_BITOPS}, + { "mno-bitops", no_argument, NULL, OPTION_NOBITOPS}, + { "mleadz", no_argument, NULL, OPTION_LEADZ}, + { "mno-leadz", no_argument, NULL, OPTION_NOLEADZ}, + { "mabsdiff", no_argument, NULL, OPTION_ABSDIFF}, + { "mno-absdiff", no_argument, NULL, OPTION_NOABSDIFF}, + { "mminmax", no_argument, NULL, OPTION_MINMAX}, + { "mno-minmax", no_argument, NULL, OPTION_NOMINMAX}, + { "mclip", no_argument, NULL, OPTION_CLIP}, + { "mno-clip", no_argument, NULL, OPTION_NOCLIP}, + { "msatur", no_argument, NULL, OPTION_SATUR}, + { "mno-satur", no_argument, NULL, OPTION_NOSATUR}, + { "mcop32", no_argument, NULL, OPTION_COP32}, + { "mdebug", no_argument, NULL, OPTION_DEBUG}, + { "mno-debug", no_argument, NULL, OPTION_NODEBUG}, + { "mlibrary", no_argument, NULL, OPTION_LIBRARY}, + { NULL, 0, NULL, 0 } }; +size_t md_longopts_size = sizeof (md_longopts); + +const char * md_shortopts = ""; +static int optbits = 0; +static int optbitset = 0; + +int +md_parse_option (int c, char *arg ATTRIBUTE_UNUSED) +{ + int i, idx; + switch (c) + { + case OPTION_EB: + target_big_endian = 1; + break; + case OPTION_EL: + target_big_endian = 0; + break; + case OPTION_CONFIG: + idx = 0; + for (i=1; mep_config_map[i].name; i++) + if (strcmp (mep_config_map[i].name, arg) == 0) + { + idx = i; + break; + } + if (!idx) + { + fprintf (stderr, "Error: unknown configuration %s\n", arg); + return 0; + } + mep_config_index = idx; + target_big_endian = mep_config_map[idx].big_endian; + break; + case OPTION_AVERAGE: + optbits |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN; + break; + case OPTION_NOAVERAGE: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_AVE_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN; + break; + case OPTION_MULT: + optbits |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN; + break; + case OPTION_NOMULT: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_MUL_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN; + break; + case OPTION_DIV: + optbits |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN; + break; + case OPTION_NODIV: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_DIV_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN; + break; + case OPTION_BITOPS: + optbits |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN; + break; + case OPTION_NOBITOPS: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_BIT_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN; + break; + case OPTION_LEADZ: + optbits |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN; + break; + case OPTION_NOLEADZ: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_LDZ_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN; + break; + case OPTION_ABSDIFF: + optbits |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN; + break; + case OPTION_NOABSDIFF: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_ABS_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN; + break; + case OPTION_MINMAX: + optbits |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN; + break; + case OPTION_NOMINMAX: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_MINMAX_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN; + break; + case OPTION_CLIP: + optbits |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN; + break; + case OPTION_NOCLIP: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_CLIP_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN; + break; + case OPTION_SATUR: + optbits |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN; + break; + case OPTION_NOSATUR: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_SAT_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN; + break; + case OPTION_COP32: + optbits |= 1 << CGEN_INSN_OPTIONAL_CP_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_CP_INSN; + break; + case OPTION_DEBUG: + optbits |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN; + optbitset |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN; + break; + case OPTION_NODEBUG: + optbits &= ~(1 << CGEN_INSN_OPTIONAL_DEBUG_INSN); + optbitset |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN; + break; + case OPTION_LIBRARY: + library_flag = EF_MEP_LIBRARY; + break; + case OPTION_REPEAT: + case OPTION_NOREPEAT: + break; + default: + return 0; + } + return 1; +} + +void +md_show_usage (FILE *stream) +{ + fprintf (stream, _("MeP specific command line options:\n\ + -EB assemble for a big endian system (default)\n\ + -EL assemble for a little endian system\n\ + -mconfig=<name> specify a chip configuration to use\n\ + -maverage -mno-average -mmult -mno-mult -mdiv -mno-div\n\ + -mbitops -mno-bitops -mleadz -mno-leadz -mabsdiff -mno-absdiff\n\ + -mminmax -mno-minmax -mclip -mno-clip -msatur -mno-satur -mcop32\n\ + enable/disable the given opcodes\n\ +\n\ + If -mconfig is given, the other -m options modify it. Otherwise,\n\ + if no -m options are given, all core opcodes are enabled;\n\ + if any enabling -m options are given, only those are enabled;\n\ + if only disabling -m options are given, only those are disabled.\n\ +")); + if (mep_config_map[1].name) + { + int i; + fprintf (stream, " -mconfig=STR specify the configuration to use\n"); + fprintf (stream, " Configurations:"); + for (i=0; mep_config_map[i].name; i++) + fprintf (stream, " %s", mep_config_map[i].name); + fprintf (stream, "\n"); + } +} + + + +static void +mep_check_for_disabled_registers (mep_insn *insn) +{ + static int initted = 0; + static int has_mul_div = 0; + static int has_cop = 0; + static int has_debug = 0; + unsigned int b, r; + + if (allow_disabled_registers) + return; + +#if !CGEN_INT_INSN_P + if (target_big_endian) + b = insn->buffer[0] * 256 + insn->buffer[1]; + else + b = insn->buffer[1] * 256 + insn->buffer[0]; +#else + b = insn->buffer[0]; +#endif + + if ((b & 0xfffff00e) == 0x7008 /* stc */ + || (b & 0xfffff00e) == 0x700a /* ldc */) + { + if (!initted) + { + initted = 1; + if ((MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_MUL_INSN)) + || (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_DIV_INSN))) + has_mul_div = 1; + if (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_DEBUG_INSN)) + has_debug = 1; + if (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_CP_INSN)) + has_cop = 1; + } + + r = ((b & 0x00f0) >> 4) | ((b & 0x0001) << 4); + switch (r) + { + case 7: /* $hi */ + case 8: /* $lo */ + if (!has_mul_div) + as_bad ("$hi and $lo are disabled when MUL and DIV are off"); + break; + case 12: /* $mb0 */ + case 13: /* $me0 */ + case 14: /* $mb1 */ + case 15: /* $me1 */ + if (!has_cop) + as_bad ("$mb0, $me0, $mb1, and $me1 are disabled when COP is off"); + break; + case 24: /* $dbg */ + case 25: /* $depc */ + if (!has_debug) + as_bad ("$dbg and $depc are disabled when DEBUG is off"); + break; + } + } +} + +static int +mep_machine (void) +{ + switch (MEP_CPU) + { + default: break; + case EF_MEP_CPU_C2: return bfd_mach_mep; + case EF_MEP_CPU_C3: return bfd_mach_mep; + case EF_MEP_CPU_C4: return bfd_mach_mep; + case EF_MEP_CPU_H1: return bfd_mach_mep_h1; + } + + return bfd_mach_mep; +} + +/* The MeP version of the cgen parse_operand function. The only difference + from the standard version is that we want to avoid treating '$foo' and + '($foo...)' as references to a symbol called '$foo'. The chances are + that '$foo' is really a misspelt register. */ + +static const char * +mep_parse_operand (CGEN_CPU_DESC cd, enum cgen_parse_operand_type want, + const char **strP, int opindex, int opinfo, + enum cgen_parse_operand_result *resultP, bfd_vma *valueP) +{ + if (want == CGEN_PARSE_OPERAND_INTEGER || want == CGEN_PARSE_OPERAND_ADDRESS) + { + const char *next; + + next = *strP; + while (*next == '(') + next++; + if (*next == '$') + return "Not a valid literal"; + } + return gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, + resultP, valueP); +} + +void +md_begin () +{ + /* Initialize the `cgen' interface. */ + + /* If the user specifies no options, we default to allowing + everything. If the user specifies any enabling options, we + default to allowing only what is specified. If the user + specifies only disabling options, we only disable what is + specified. If the user specifies options and a config, the + options modify the config. */ + if (optbits && mep_config_index == 0) + MEP_OMASK = optbits; + else + MEP_OMASK = (MEP_OMASK & ~optbitset) | optbits; + + /* Set the machine number and endian. */ + gas_cgen_cpu_desc = mep_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0, + CGEN_CPU_OPEN_ENDIAN, + target_big_endian + ? CGEN_ENDIAN_BIG + : CGEN_ENDIAN_LITTLE, + CGEN_CPU_OPEN_ISAS, 0, + CGEN_CPU_OPEN_END); + mep_cgen_init_asm (gas_cgen_cpu_desc); + + /* This is a callback from cgen to gas to parse operands. */ + cgen_set_parse_operand_fn (gas_cgen_cpu_desc, mep_parse_operand); + + /* Identify the architecture. */ + bfd_default_set_arch_mach (stdoutput, bfd_arch_mep, mep_machine ()); + + /* Store the configuration number and core. */ + bfd_set_private_flags (stdoutput, MEP_CPU | MEP_CONFIG | library_flag); + + /* Initialize the array we'll be using to store fixups. */ + gas_cgen_initialize_saved_fixups_array(); +} + +/* Variant of mep_cgen_assemble_insn. Assemble insn STR of cpu CD as a + coprocessor instruction, if possible, into FIELDS, BUF, and INSN. */ + +static const CGEN_INSN * +mep_cgen_assemble_cop_insn (CGEN_CPU_DESC cd, + const char *str, + CGEN_FIELDS *fields, + CGEN_INSN_BYTES_PTR buf, + const struct cgen_insn *pinsn) +{ + const char *start; + CGEN_INSN_LIST *ilist; + const char *errmsg = NULL; + + /* The instructions are stored in hashed lists. */ + ilist = CGEN_ASM_LOOKUP_INSN (gas_cgen_cpu_desc, + CGEN_INSN_MNEMONIC (pinsn)); + + start = str; + for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) + { + const CGEN_INSN *insn = ilist->insn; + if (strcmp (CGEN_INSN_MNEMONIC (ilist->insn), + CGEN_INSN_MNEMONIC (pinsn)) == 0 + && MEP_INSN_COP_P (ilist->insn) + && mep_cgen_insn_supported (cd, insn)) + { + str = start; + + /* skip this insn if str doesn't look right lexically */ + if (CGEN_INSN_RX (insn) != NULL && + regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH) + continue; + + /* Allow parse/insert handlers to obtain length of insn. */ + CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); + + errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); + if (errmsg != NULL) + continue; + + errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, + (bfd_vma) 0); + if (errmsg != NULL) + continue; + + return insn; + } + } + return pinsn; +} + +static void +mep_save_insn (mep_insn insn) +{ + /* Consider change MAX_SAVED_FIXUP_CHAINS to MAX_PARALLEL_INSNS. */ + if (num_insns_saved < 0 || num_insns_saved >= MAX_SAVED_FIXUP_CHAINS) + { + as_fatal("index into saved_insns[] out of bounds."); + return; + } + saved_insns[num_insns_saved] = insn; + gas_cgen_save_fixups(num_insns_saved); + num_insns_saved++; +} + +static void +mep_check_parallel32_scheduling (void) +{ + int insn0iscopro, insn1iscopro, insn0length, insn1length; + + /* More than two instructions means that either someone is referring to + an internally parallel core or an internally parallel coprocessor, + neither of which are supported at this time. */ + if ( num_insns_saved > 2 ) + as_fatal("Internally paralled cores and coprocessors not supported."); + + /* If there are no insns saved, that's ok. Just return. This will + happen when mep_process_saved_insns is called when the end of the + source file is reached and there are no insns left to be processed. */ + if (num_insns_saved == 0) + return; + + /* Check some of the attributes of the first insn. */ + insn0iscopro = MEP_INSN_COP_P (saved_insns[0].insn); + insn0length = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields); + + if (num_insns_saved == 2) + { + /* Check some of the attributes of the first insn. */ + insn1iscopro = MEP_INSN_COP_P (saved_insns[1].insn); + insn1length = CGEN_FIELDS_BITSIZE (& saved_insns[1].fields); + + if ((insn0iscopro && !insn1iscopro) + || (insn1iscopro && !insn0iscopro)) + { + /* We have one core and one copro insn. If their sizes + add up to 32, then the combination is valid. */ + if (insn0length + insn1length == 32) + return; + else + as_bad ("core and copro insn lengths must total 32 bits."); + } + else + as_bad ("vliw group must consist of 1 core and 1 copro insn."); + } + else + { + /* If we arrive here, we have one saved instruction. There are a + number of possible cases: + + 1. The instruction is a 32 bit core or coprocessor insn and + can be executed by itself. Valid. + + 2. The instrucion is a core instruction for which a cop nop + exists. In this case, insert the cop nop into the saved + insn array after the core insn and return. Valid. + + 3. The instruction is a coprocessor insn for which a core nop + exists. In this case, move the coprocessor insn to the + second element of the array and put the nop in the first + element then return. Valid. + + 4. The instruction is a core or coprocessor instruction for + which there is no matching coprocessor or core nop to use + to form a valid vliw insn combination. In this case, we + we have to abort. */ + + if (insn0length > 32) + as_fatal ("Cannot use 48- or 64-bit insns with a 32 bit datapath."); + + if (insn0length == 32) + return; + + /* Insn is smaller than datapath. If there are no matching + nops for this insn, then terminate assembly. */ + if (CGEN_INSN_ATTR_VALUE (saved_insns[0].insn, + CGEN_INSN_VLIW32_NO_MATCHING_NOP)) + as_fatal ("No valid nop."); + + /* At this point we know that we have a single 16-bit insn that has + a matching nop. We have to assemble it and put it into the saved + insn and fixup chain arrays. */ + + if (insn0iscopro) + { + char *errmsg; + mep_insn insn; + + /* Move the insn and it's fixups to the second element of the + saved insns arrary and insert a 16 bit core nope into the + first element. */ + insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "nop", + &insn.fields, insn.buffer, + &errmsg); + if (!insn.insn) + { + as_bad ("%s", errmsg); + return; + } + + /* Move the insn in element 0 to element 1 and insert the + nop into element 0. Move the fixups in element 0 to + element 1 and save the current fixups to element 0. + Really there aren't any fixups at this point because we're + inserting a nop but we might as well be general so that + if there's ever a need to insert a general insn, we'll + have an example. */ + saved_insns[1] = saved_insns[0]; + saved_insns[0] = insn; + num_insns_saved++; + gas_cgen_swap_fixups (0); + gas_cgen_save_fixups (1); + } + else + { + char * errmsg; + mep_insn insn; + int insn_num = saved_insns[0].insn->base->num; + + /* Use 32 bit branches and skip the nop. */ + if (insn_num == MEP_INSN_BSR12 + || insn_num == MEP_INSN_BEQZ + || insn_num == MEP_INSN_BNEZ) + return; + + /* Insert a 16-bit coprocessor nop. Note that at the time */ + /* this was done, no 16-bit coprocessor nop was defined. */ + insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop16", + &insn.fields, insn.buffer, + &errmsg); + if (!insn.insn) + { + as_bad ("%s", errmsg); + return; + } + + /* Now put the insn and fixups into the arrays. */ + mep_save_insn (insn); + } + } +} + +static void +mep_check_parallel64_scheduling (void) +{ + int insn0iscopro, insn1iscopro, insn0length, insn1length; + + /* More than two instructions means that someone is referring to an + internally parallel core or an internally parallel coprocessor. */ + /* These are not currently supported. */ + if (num_insns_saved > 2) + as_fatal ("Internally parallel cores of coprocessors not supported."); + + /* If there are no insns saved, that's ok. Just return. This will + happen when mep_process_saved_insns is called when the end of the + source file is reached and there are no insns left to be processed. */ + if (num_insns_saved == 0) + return; + + /* Check some of the attributes of the first insn. */ + insn0iscopro = MEP_INSN_COP_P (saved_insns[0].insn); + insn0length = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields); + + if (num_insns_saved == 2) + { + /* Check some of the attributes of the first insn. */ + insn1iscopro = MEP_INSN_COP_P (saved_insns[1].insn); + insn1length = CGEN_FIELDS_BITSIZE (& saved_insns[1].fields); + + if ((insn0iscopro && !insn1iscopro) + || (insn1iscopro && !insn0iscopro)) + { + /* We have one core and one copro insn. If their sizes + add up to 64, then the combination is valid. */ + if (insn0length + insn1length == 64) + return; + else + as_bad ("core and copro insn lengths must total 64 bits."); + } + else + as_bad ("vliw group must consist of 1 core and 1 copro insn."); + } + else + { + /* If we arrive here, we have one saved instruction. There are a + number of possible cases: + + 1. The instruction is a 64 bit coprocessor insn and can be + executed by itself. Valid. + + 2. The instrucion is a core instruction for which a cop nop + exists. In this case, insert the cop nop into the saved + insn array after the core insn and return. Valid. + + 3. The instruction is a coprocessor insn for which a core nop + exists. In this case, move the coprocessor insn to the + second element of the array and put the nop in the first + element then return. Valid. + + 4. The instruction is a core or coprocessor instruction for + which there is no matching coprocessor or core nop to use + to form a valid vliw insn combination. In this case, we + we have to abort. */ + + /* If the insn is 64 bits long, it can run alone. The size check + is done indepependantly of whether the insn is core or copro + in case 64 bit coprocessor insns are added later. */ + if (insn0length == 64) + return; + + /* Insn is smaller than datapath. If there are no matching + nops for this insn, then terminate assembly. */ + if (CGEN_INSN_ATTR_VALUE (saved_insns[0].insn, + CGEN_INSN_VLIW64_NO_MATCHING_NOP)) + as_fatal ("No valid nop."); + + if (insn0iscopro) + { + char *errmsg; + mep_insn insn; + int i; + + /* Initialize the insn buffer. */ + for (i = 0; i < 64; i++) + insn.buffer[i] = '\0'; + + /* We have a coprocessor insn. At this point in time there + are is 32-bit core nop. There is only a 16-bit core + nop. The idea is to allow for a relatively arbitrary + coprocessor to be specified. We aren't looking at + trying to cover future changes in the core at this time + since it is assumed that the core will remain fairly + static. If there ever are 32 or 48 bit core nops added, + they will require entries below. */ + + if (insn0length == 48) + { + /* Move the insn and fixups to the second element of the + arrays then assemble and insert a 16 bit core nop. */ + insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "nop", + & insn.fields, insn.buffer, + & errmsg); + } + else + { + /* If this is reached, then we have a single coprocessor + insn that is not 48 bits long, but for which the assembler + thinks there is a matching core nop. If a 32-bit core + nop has been added, then make the necessary changes and + handle its assembly and insertion here. Otherwise, + go figure out why either: + + 1. The assembler thinks that there is a 32-bit core nop + to match a 32-bit coprocessor insn, or + 2. The assembler thinks that there is a 48-bit core nop + to match a 16-bit coprocessor insn. */ + + as_fatal ("Assembler expects a non-existent core nop."); + } + + if (!insn.insn) + { + as_bad ("%s", errmsg); + return; + } + + /* Move the insn in element 0 to element 1 and insert the + nop into element 0. Move the fixups in element 0 to + element 1 and save the current fixups to element 0. + Really there aren't any fixups at this point because we're + inserting a nop but we might as well be general so that + if there's ever a need to insert a general insn, we'll + have an example. */ + + saved_insns[1] = saved_insns[0]; + saved_insns[0] = insn; + num_insns_saved++; + gas_cgen_swap_fixups(0); + gas_cgen_save_fixups(1); + + } + else + { + char * errmsg; + mep_insn insn; + int i; + + /* Initialize the insn buffer */ + for (i = 0; i < 64; i++) + insn.buffer[i] = '\0'; + + /* We have a core insn. We have to handle all possible nop + lengths. If a coprocessor doesn't have a nop of a certain + length but there exists core insns that when combined with + a nop of that length would fill the datapath, those core + insns will be flagged with the VLIW_NO_CORRESPONDING_NOP + attribute. That will ensure that when used in a way that + requires a nop to be inserted, assembly will terminate + before reaching this section of code. This guarantees + that cases below which would result in the attempted + insertion of nop that doesn't exist will never be entered. */ + if (insn0length == 16) + { + /* Insert 48 bit coprocessor nop. */ + /* Assemble it and put it into the arrays. */ + insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop48", + &insn.fields, insn.buffer, + &errmsg); + } + else if (insn0length == 32) + { + /* Insert 32 bit coprocessor nop. */ + insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop32", + &insn.fields, insn.buffer, + &errmsg); + } + else if (insn0length == 48) + { + /* Insert 16 bit coprocessor nop. */ + insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop16", + &insn.fields, insn.buffer, + &errmsg); + } + else + /* Core insn has an invalid length. Something has gone wrong. */ + as_fatal ("Core insn has invalid length! Something is wrong!"); + + if (!insn.insn) + { + as_bad ("%s", errmsg); + return; + } + + /* Now put the insn and fixups into the arrays. */ + mep_save_insn (insn); + } + } +} + +/* The scheduling functions are just filters for invalid combinations. + If there is a violation, they terminate assembly. Otherise they + just fall through. Succesful combinations cause no side effects + other than valid nop insertion. */ + +static void +mep_check_parallel_scheduling (void) +{ + /* This is where we will eventually read the config information + and choose which scheduling checking function to call. */ + if (MEP_VLIW64) + mep_check_parallel64_scheduling (); + else + mep_check_parallel32_scheduling (); +} + +static void +mep_process_saved_insns (void) +{ + int i; + + gas_cgen_save_fixups (MAX_SAVED_FIXUP_CHAINS - 1); + + /* We have to check for valid scheduling here. */ + mep_check_parallel_scheduling (); + + /* If the last call didn't cause assembly to terminate, we have + a valid vliw insn/insn pair saved. Restore this instructions' + fixups and process the insns. */ + for (i = 0;i<num_insns_saved;i++) + { + gas_cgen_restore_fixups (i); + gas_cgen_finish_insn (saved_insns[i].insn, saved_insns[i].buffer, + CGEN_FIELDS_BITSIZE (& saved_insns[i].fields), + 1, NULL); + } + gas_cgen_restore_fixups (MAX_SAVED_FIXUP_CHAINS - 1); + + /* Clear the fixups and reset the number insn saved to 0. */ + gas_cgen_initialize_saved_fixups_array (); + num_insns_saved = 0; + listing_prev_line (); +} + +void +md_assemble (char * str) +{ + static CGEN_BITSET* isas = NULL; + char * errmsg; + + /* Initialize GAS's cgen interface for a new instruction. */ + gas_cgen_init_parse (); + + /* There are two possible modes: core and vliw. We have to assemble + differently for each. + + Core Mode: We assemble normally. All instructions are on a + single line and are made up of one mnemonic and one + set of operands. + VLIW Mode: Vliw combinations are indicated as follows: + + core insn + + copro insn + + We want to handle the general case where more than + one instruction can be preceeded by a +. This will + happen later if we add support for internally parallel + coprocessors. We'll make the parsing nice and general + so that it can handle an arbitrary number of insns + with leading +'s. The actual checking for valid + combinations is done elsewhere. */ + + /* Initialize the isa to refer to the core. */ + if (isas == NULL) + isas = cgen_bitset_copy (& MEP_CORE_ISA); + else + { + cgen_bitset_clear (isas); + cgen_bitset_union (isas, & MEP_CORE_ISA, isas); + } + gas_cgen_cpu_desc->isas = isas; + + if (mode == VLIW) + { + /* VLIW mode. */ + + int thisInsnIsCopro = 0; + mep_insn insn; + int i; + + /* Initialize the insn buffer */ + + if (! CGEN_INT_INSN_P) + for (i=0; i < CGEN_MAX_INSN_SIZE; i++) + insn.buffer[i]='\0'; + + /* Can't tell core / copro insns apart at parse time! */ + cgen_bitset_union (isas, & MEP_COP_ISA, isas); + + /* Assemble the insn so we can examine its attributes. */ + insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, str, + &insn.fields, insn.buffer, + &errmsg); + if (!insn.insn) + { + as_bad ("%s", errmsg); + return; + } + mep_check_for_disabled_registers (&insn); + + /* Check to see if it's a coprocessor instruction. */ + thisInsnIsCopro = MEP_INSN_COP_P (insn.insn); + + if (!thisInsnIsCopro) + { + insn.insn = mep_cgen_assemble_cop_insn (gas_cgen_cpu_desc, str, + &insn.fields, insn.buffer, + insn.insn); + thisInsnIsCopro = MEP_INSN_COP_P (insn.insn); + mep_check_for_disabled_registers (&insn); + } + + if (pluspresent) + { + /* A plus was present. */ + /* Check for a + with a core insn and abort if found. */ + if (!thisInsnIsCopro) + { + as_fatal("A core insn cannot be preceeded by a +.\n"); + return; + } + + if (num_insns_saved > 0) + { + /* There are insns in the queue. Add this one. */ + mep_save_insn (insn); + } + else + { + /* There are no insns in the queue and a plus is present. + This is a syntax error. Let's not tolerate this. + We can relax this later if necessary. */ + as_bad (_("Invalid use of parallelization operator.")); + return; + } + } + else + { + /* No plus was present. */ + if (num_insns_saved > 0) + { + /* There are insns saved and we came across an insn without a + leading +. That's the signal to process the saved insns + before proceeding then treat the current insn as the first + in a new vliw group. */ + mep_process_saved_insns (); + num_insns_saved = 0; + /* mep_save_insn (insn); */ + } + mep_save_insn (insn); +#if 0 + else + { + + /* Core Insn. Add it to the beginning of the queue. */ + mep_save_insn (insn); + /* gas_cgen_save_fixups(num_insns_saved); */ + } +#endif + } + + pluspresent = 0; + } + else + { + /* Core mode. */ + + /* Only single instructions are assembled in core mode. */ + mep_insn insn; + + /* If a leading '+' was present, issue an error. + That's not allowed in core mode. */ + if (pluspresent) + { + as_bad (_("Leading plus sign not allowed in core mode")); + return; + } + + insn.insn = mep_cgen_assemble_insn + (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); + + if (!insn.insn) + { + as_bad ("%s", errmsg); + return; + } + gas_cgen_finish_insn (insn.insn, insn.buffer, + CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); + mep_check_for_disabled_registers (&insn); + } +} + +valueT +md_section_align (segT segment, valueT size) +{ + int align = bfd_get_section_alignment (stdoutput, segment); + return ((size + (1 << align) - 1) & (-1 << align)); +} + + +symbolS * +md_undefined_symbol (char *name ATTRIBUTE_UNUSED) +{ + return 0; +} + +/* Interface to relax_segment. */ + + +const relax_typeS md_relax_table[] = +{ + /* The fields are: + 1) most positive reach of this state, + 2) most negative reach of this state, + 3) how many bytes this mode will have in the variable part of the frag + 4) which index into the table to try if we can't fit into this one. */ + /* Note that we use "beq" because "jmp" has a peculiarity - it cannot + jump to addresses with any bits 27..24 set. So, we use beq as a + 17-bit pc-relative branch to avoid using jmp, just in case. */ + + /* 0 */ { 0, 0, 0, 0 }, /* unused */ + /* 1 */ { 0, 0, 0, 0 }, /* marker for "don't know yet" */ + + /* 2 */ { 2047, -2048, 0, 3 }, /* bsr12 */ + /* 3 */ { 0, 0, 2, 0 }, /* bsr16 */ + + /* 4 */ { 2047, -2048, 0, 5 }, /* bra */ + /* 5 */ { 65535, -65536, 2, 6 }, /* beq $0,$0 */ + /* 6 */ { 0, 0, 2, 0 }, /* jmp24 */ + + /* 7 */ { 65535, -65536, 0, 8 }, /* beqi */ + /* 8 */ { 0, 0, 4, 0 }, /* bnei/jmp */ + + /* 9 */ { 127, -128, 0, 10 }, /* beqz */ + /* 10 */ { 65535, -65536, 2, 11 }, /* beqi */ + /* 11 */ { 0, 0, 4, 0 }, /* bnei/jmp */ + + /* 12 */ { 65535, -65536, 0, 13 }, /* bnei */ + /* 13 */ { 0, 0, 4, 0 }, /* beqi/jmp */ + + /* 14 */ { 127, -128, 0, 15 }, /* bnez */ + /* 15 */ { 65535, -65536, 2, 16 }, /* bnei */ + /* 16 */ { 0, 0, 4, 0 }, /* beqi/jmp */ + + /* 17 */ { 65535, -65536, 0, 13 }, /* bgei */ + /* 18 */ { 0, 0, 4, 0 }, + /* 19 */ { 65535, -65536, 0, 13 }, /* blti */ + /* 20 */ { 0, 0, 4, 0 }, + /* 19 */ { 65535, -65536, 0, 13 }, /* bcpeq */ + /* 20 */ { 0, 0, 4, 0 }, + /* 19 */ { 65535, -65536, 0, 13 }, /* bcpne */ + /* 20 */ { 0, 0, 4, 0 }, + /* 19 */ { 65535, -65536, 0, 13 }, /* bcpat */ + /* 20 */ { 0, 0, 4, 0 }, + /* 19 */ { 65535, -65536, 0, 13 }, /* bcpaf */ + /* 20 */ { 0, 0, 4, 0 } +}; + +/* Pseudo-values for 64 bit "insns" which are combinations of two 32 + bit insns. */ +typedef enum { + MEP_PSEUDO64_NONE, + MEP_PSEUDO64_16BITCC, + MEP_PSEUDO64_32BITCC, +} MepPseudo64Values; + +static struct { + int insn; + int growth; + int insn_for_extern; +} subtype_mappings[] = { + { 0, 0, 0 }, + { 0, 0, 0 }, + { MEP_INSN_BSR12, 0, MEP_INSN_BSR24 }, + { MEP_INSN_BSR24, 2, MEP_INSN_BSR24 }, + { MEP_INSN_BRA, 0, MEP_INSN_BRA }, + { MEP_INSN_BEQ, 2, MEP_INSN_BEQ }, + { MEP_INSN_JMP, 2, MEP_INSN_JMP }, + { MEP_INSN_BEQI, 0, MEP_INSN_BEQI }, + { -1, 4, MEP_PSEUDO64_32BITCC }, + { MEP_INSN_BEQZ, 0, MEP_INSN_BEQZ }, + { MEP_INSN_BEQI, 2, MEP_INSN_BEQI }, + { -1, 4, MEP_PSEUDO64_16BITCC }, + { MEP_INSN_BNEI, 0, MEP_INSN_BNEI }, + { -1, 4, MEP_PSEUDO64_32BITCC }, + { MEP_INSN_BNEZ, 0, MEP_INSN_BNEZ }, + { MEP_INSN_BNEI, 2, MEP_INSN_BNEI }, + { -1, 4, MEP_PSEUDO64_16BITCC }, + { MEP_INSN_BGEI, 0, MEP_INSN_BGEI }, + { -1, 4, MEP_PSEUDO64_32BITCC }, + { MEP_INSN_BLTI, 0, MEP_INSN_BLTI }, + { -1, 4, MEP_PSEUDO64_32BITCC }, + { MEP_INSN_BCPEQ, 0, MEP_INSN_BCPEQ }, + { -1, 4, MEP_PSEUDO64_32BITCC }, + { MEP_INSN_BCPNE, 0, MEP_INSN_BCPNE }, + { -1, 4, MEP_PSEUDO64_32BITCC }, + { MEP_INSN_BCPAT, 0, MEP_INSN_BCPAT }, + { -1, 4, MEP_PSEUDO64_32BITCC }, + { MEP_INSN_BCPAF, 0, MEP_INSN_BCPAF }, + { -1, 4, MEP_PSEUDO64_32BITCC } +}; +#define NUM_MAPPINGS (sizeof (subtype_mappings) / sizeof (subtype_mappings[0])) + +void +mep_prepare_relax_scan (fragS *fragP, offsetT *aim, relax_substateT this_state) +{ + symbolS *symbolP = fragP->fr_symbol; + if (symbolP && !S_IS_DEFINED (symbolP)) + *aim = 0; + /* Adjust for MeP pcrel not being relative to the next opcode. */ + *aim += 2 + md_relax_table[this_state].rlx_length; +} + +static int +insn_to_subtype (int insn) +{ + unsigned int i; + for (i=0; i<NUM_MAPPINGS; i++) + if (insn == subtype_mappings[i].insn) + return i; + abort (); +} + +/* Return an initial guess of the length by which a fragment must grow + to hold a branch to reach its destination. Also updates fr_type + and fr_subtype as necessary. + + Called just before doing relaxation. Any symbol that is now + undefined will not become defined. The guess for fr_var is + ACTUALLY the growth beyond fr_fix. Whatever we do to grow fr_fix + or fr_var contributes to our returned value. Although it may not + be explicit in the frag, pretend fr_var starts with a 0 value. */ + +int +md_estimate_size_before_relax (fragS * fragP, segT segment) +{ + if (fragP->fr_subtype == 1) + fragP->fr_subtype = insn_to_subtype (fragP->fr_cgen.insn->base->num); + + if (S_GET_SEGMENT (fragP->fr_symbol) != segment) + { + int new_insn; + + new_insn = subtype_mappings[fragP->fr_subtype].insn_for_extern; + fragP->fr_subtype = insn_to_subtype (new_insn); + } + + if (MEP_VLIW && ! MEP_VLIW64 + && (bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)) + { + /* Use 32 bit branches for vliw32 so the vliw word is not split. */ + switch (fragP->fr_cgen.insn->base->num) + { + case MEP_INSN_BSR12: + fragP->fr_subtype = insn_to_subtype + (subtype_mappings[fragP->fr_subtype].insn_for_extern); + break; + case MEP_INSN_BEQZ: + fragP->fr_subtype ++; + break; + case MEP_INSN_BNEZ: + fragP->fr_subtype ++; + break; + } + } + + if (fragP->fr_cgen.insn->base + && fragP->fr_cgen.insn->base->num + != subtype_mappings[fragP->fr_subtype].insn) + { + int new_insn= subtype_mappings[fragP->fr_subtype].insn; + if (new_insn != -1) + { + fragP->fr_cgen.insn = (fragP->fr_cgen.insn + - fragP->fr_cgen.insn->base->num + + new_insn); + } + } + + return subtype_mappings[fragP->fr_subtype].growth; +} + +/* *fragP has been relaxed to its final size, and now needs to have + the bytes inside it modified to conform to the new size. + + Called after relaxation is finished. + fragP->fr_type == rs_machine_dependent. + fragP->fr_subtype is the subtype of what the address relaxed to. */ + +static int +target_address_for (fragS *frag) +{ + int rv = frag->fr_offset; + symbolS *sym = frag->fr_symbol; + + if (sym) + rv += S_GET_VALUE (sym); + + return rv; +} + +void +md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, + segT sec ATTRIBUTE_UNUSED, + fragS *fragP) +{ + int addend, rn, bit = 0; + int operand; + int where = fragP->fr_opcode - fragP->fr_literal; + int e = target_big_endian ? 0 : 1; + + addend = target_address_for (fragP) - (fragP->fr_address + where); + + if (subtype_mappings[fragP->fr_subtype].insn == -1) + { + fragP->fr_fix += subtype_mappings[fragP->fr_subtype].growth; + switch (subtype_mappings[fragP->fr_subtype].insn_for_extern) + { + case MEP_PSEUDO64_16BITCC: + fragP->fr_opcode[1^e] = ((fragP->fr_opcode[1^e] & 1) ^ 1) | 0x06; + fragP->fr_opcode[2^e] = 0xd8; + fragP->fr_opcode[3^e] = 0x08; + fragP->fr_opcode[4^e] = 0; + fragP->fr_opcode[5^e] = 0; + where += 2; + break; + case MEP_PSEUDO64_32BITCC: + if (fragP->fr_opcode[0^e] & 0x10) + fragP->fr_opcode[1^e] ^= 0x01; + else + fragP->fr_opcode[1^e] ^= 0x04; + fragP->fr_opcode[2^e] = 0; + fragP->fr_opcode[3^e] = 4; + fragP->fr_opcode[4^e] = 0xd8; + fragP->fr_opcode[5^e] = 0x08; + fragP->fr_opcode[6^e] = 0; + fragP->fr_opcode[7^e] = 0; + where += 4; + break; + default: + abort (); + } + fragP->fr_cgen.insn = (fragP->fr_cgen.insn + - fragP->fr_cgen.insn->base->num + + MEP_INSN_JMP); + operand = MEP_OPERAND_PCABS24A2; + } + else + switch (fragP->fr_cgen.insn->base->num) + { + case MEP_INSN_BSR12: + fragP->fr_opcode[0^e] = 0xb0 | ((addend >> 8) & 0x0f); + fragP->fr_opcode[1^e] = 0x01 | (addend & 0xfe); + operand = MEP_OPERAND_PCREL12A2; + break; + + case MEP_INSN_BSR24: + fragP->fr_fix += 2; + fragP->fr_opcode[0^e] = 0xd8 | ((addend >> 5) & 0x07); + fragP->fr_opcode[1^e] = 0x09 | ((addend << 3) & 0xf0); + fragP->fr_opcode[2^e] = 0x00 | ((addend >>16) & 0xff); + fragP->fr_opcode[3^e] = 0x00 | ((addend >> 8) & 0xff); + operand = MEP_OPERAND_PCREL24A2; + break; + + case MEP_INSN_BRA: + fragP->fr_opcode[0^e] = 0xb0 | ((addend >> 8) & 0x0f); + fragP->fr_opcode[1^e] = 0x00 | (addend & 0xfe); + operand = MEP_OPERAND_PCREL12A2; + break; + + case MEP_INSN_BEQ: + /* The default relax_frag doesn't change the state if there is no + growth, so we must manually handle converting out-of-range BEQ + instructions to JMP. */ + if (addend <= 65535 && addend >= -65536) + { + fragP->fr_fix += 2; + fragP->fr_opcode[0^e] = 0xe0; + fragP->fr_opcode[1^e] = 0x01; + fragP->fr_opcode[2^e] = 0x00 | ((addend >> 9) & 0xff); + fragP->fr_opcode[3^e] = 0x00 | ((addend >> 1) & 0xff); + operand = MEP_OPERAND_PCREL17A2; + break; + } + /* ...FALLTHROUGH... */ + + case MEP_INSN_JMP: + addend = target_address_for (fragP); + fragP->fr_fix += 2; + fragP->fr_opcode[0^e] = 0xd8 | ((addend >> 5) & 0x07); + fragP->fr_opcode[1^e] = 0x08 | ((addend << 3) & 0xf0); + fragP->fr_opcode[2^e] = 0x00 | ((addend >>16) & 0xff); + fragP->fr_opcode[3^e] = 0x00 | ((addend >> 8) & 0xff); + operand = MEP_OPERAND_PCABS24A2; + break; + + case MEP_INSN_BNEZ: + bit = 1; + case MEP_INSN_BEQZ: + fragP->fr_opcode[1^e] = bit | (addend & 0xfe); + operand = MEP_OPERAND_PCREL8A2; + break; + + case MEP_INSN_BNEI: + bit = 4; + case MEP_INSN_BEQI: + if (subtype_mappings[fragP->fr_subtype].growth) + { + fragP->fr_fix += subtype_mappings[fragP->fr_subtype].growth; + rn = fragP->fr_opcode[0^e] & 0x0f; + fragP->fr_opcode[0^e] = 0xe0 | rn; + fragP->fr_opcode[1^e] = bit; + } + fragP->fr_opcode[2^e] = 0x00 | ((addend >> 9) & 0xff); + fragP->fr_opcode[3^e] = 0x00 | ((addend >> 1) & 0xff); + operand = MEP_OPERAND_PCREL17A2; + break; + + case MEP_INSN_BLTI: + case MEP_INSN_BGEI: + case MEP_INSN_BCPEQ: + case MEP_INSN_BCPNE: + case MEP_INSN_BCPAT: + case MEP_INSN_BCPAF: + /* No opcode change needed, just operand. */ + fragP->fr_opcode[2^e] = (addend >> 9) & 0xff; + fragP->fr_opcode[3^e] = (addend >> 1) & 0xff; + operand = MEP_OPERAND_PCREL17A2; + break; + + default: + abort (); + } + + if (S_GET_SEGMENT (fragP->fr_symbol) != sec + || operand == MEP_OPERAND_PCABS24A2) + { + assert (fragP->fr_cgen.insn != 0); + gas_cgen_record_fixup (fragP, + where, + fragP->fr_cgen.insn, + (fragP->fr_fix - where) * 8, + cgen_operand_lookup_by_num (gas_cgen_cpu_desc, + operand), + fragP->fr_cgen.opinfo, + fragP->fr_symbol, fragP->fr_offset); + } +} + + +/* Functions concerning relocs. */ + +void +mep_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) +{ + /* If we already know the fixup value, adjust it in the same + way that the linker would have done. */ + if (fixP->fx_addsy == 0) + switch (fixP->fx_cgen.opinfo) + { + case BFD_RELOC_MEP_LOW16: + *valP = ((long)(*valP & 0xffff)) << 16 >> 16; + break; + case BFD_RELOC_MEP_HI16U: + *valP >>= 16; + break; + case BFD_RELOC_MEP_HI16S: + *valP = (*valP + 0x8000) >> 16; + break; + } + + /* Now call cgen's md_aply_fix. */ + gas_cgen_md_apply_fix (fixP, valP, seg); +} + +long +md_pcrel_from_section (fixS *fixP, segT sec) +{ + if (fixP->fx_addsy != (symbolS *) NULL + && (! S_IS_DEFINED (fixP->fx_addsy) + || S_GET_SEGMENT (fixP->fx_addsy) != sec)) + /* The symbol is undefined (or is defined but not in this section). + Let the linker figure it out. */ + return 0; + + /* Return the address of the opcode - cgen adjusts for opcode size + itself, to be consistent with the disassembler, which must do + so. */ + return fixP->fx_where + fixP->fx_frag->fr_address; +} + +/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. + Returns BFD_RELOC_NONE if no reloc type can be found. + *FIXP may be modified if desired. */ + +#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE) +#define MAP(n) case MEP_OPERAND_##n: return BFD_RELOC_MEP_##n; +#else +#define MAP(n) case MEP_OPERAND_/**/n: return BFD_RELOC_MEP_/**/n; +#endif + +bfd_reloc_code_real_type +md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED, + const CGEN_OPERAND *operand, + fixS *fixP) +{ + enum bfd_reloc_code_real reloc = fixP->fx_cgen.opinfo; + static char printed[MEP_OPERAND_MAX] = { 0 }; + + /* If there's a reloc here, it's because the parser saw a %foo() and + is giving us the correct reloc to use, or because we converted to + a different size reloc below and want to avoid "converting" more + than once. */ + if (reloc && reloc != BFD_RELOC_NONE) + return reloc; + + switch (operand->type) + { + MAP (PCREL8A2); /* beqz */ + MAP (PCREL12A2); /* bsr16 */ + MAP (PCREL17A2); /* beqi */ + MAP (PCREL24A2); /* bsr24 */ + MAP (PCABS24A2); /* jmp */ + MAP (UIMM24); /* mov */ + MAP (ADDR24A4); /* sw/lw */ + + /* The rest of the relocs should be generated by the parser, + for things such as %tprel(), etc. */ + case MEP_OPERAND_SIMM16: +#ifdef OBJ_COMPLEX_RELC + /* coalescing this into RELOC_MEP_16 is actually a bug, + since it's a signed operand. let the relc code handle it. */ + return BFD_RELOC_RELC; +#endif + + case MEP_OPERAND_UIMM16: + case MEP_OPERAND_SDISP16: + case MEP_OPERAND_CODE16: + fixP->fx_where += 2; + /* to avoid doing the above add twice */ + fixP->fx_cgen.opinfo = BFD_RELOC_MEP_16; + return BFD_RELOC_MEP_16; + + default: +#ifdef OBJ_COMPLEX_RELC + /* this is not an error, yet. + pass it to the linker. */ + return BFD_RELOC_RELC; +#endif + if (printed[operand->type]) + return BFD_RELOC_NONE; + printed[operand->type] = 1; + + as_bad_where (fixP->fx_file, fixP->fx_line, + _("Don't know how to relocate plain operands of type %s"), + operand->name); + + /* Print some helpful hints for the user. */ + switch (operand->type) + { + case MEP_OPERAND_UDISP7: + case MEP_OPERAND_UDISP7A2: + case MEP_OPERAND_UDISP7A4: + as_bad_where (fixP->fx_file, fixP->fx_line, + _("Perhaps you are missing %%tpoff()?")); + break; + default: + break; + } + return BFD_RELOC_NONE; + } +} + +/* Called while parsing an instruction to create a fixup. + We need to check for HI16 relocs and queue them up for later sorting. */ + +fixS * +mep_cgen_record_fixup_exp (fragS *frag, + int where, + const CGEN_INSN *insn, + int length, + const CGEN_OPERAND *operand, + int opinfo, + expressionS *exp) +{ + fixS * fixP = gas_cgen_record_fixup_exp (frag, where, insn, length, + operand, opinfo, exp); + return fixP; +} + +/* Return BFD reloc type from opinfo field in a fixS. + It's tricky using fx_r_type in mep_frob_file because the values + are BFD_RELOC_UNUSED + operand number. */ +#define FX_OPINFO_R_TYPE(f) ((f)->fx_cgen.opinfo) + +/* Sort any unmatched HI16 relocs so that they immediately precede + the corresponding LO16 reloc. This is called before md_apply_fix and + tc_gen_reloc. */ + +void +mep_frob_file () +{ + struct mep_hi_fixup * l; + + for (l = mep_hi_fixup_list; l != NULL; l = l->next) + { + segment_info_type * seginfo; + int pass; + + assert (FX_OPINFO_R_TYPE (l->fixp) == BFD_RELOC_HI16 + || FX_OPINFO_R_TYPE (l->fixp) == BFD_RELOC_LO16); + + /* Check quickly whether the next fixup happens to be a matching low. */ + if (l->fixp->fx_next != NULL + && FX_OPINFO_R_TYPE (l->fixp->fx_next) == BFD_RELOC_LO16 + && l->fixp->fx_addsy == l->fixp->fx_next->fx_addsy + && l->fixp->fx_offset == l->fixp->fx_next->fx_offset) + continue; + + /* Look through the fixups for this segment for a matching + `low'. When we find one, move the high just in front of it. + We do this in two passes. In the first pass, we try to find + a unique `low'. In the second pass, we permit multiple + high's relocs for a single `low'. */ + seginfo = seg_info (l->seg); + for (pass = 0; pass < 2; pass++) + { + fixS * f; + fixS * prev; + + prev = NULL; + for (f = seginfo->fix_root; f != NULL; f = f->fx_next) + { + /* Check whether this is a `low' fixup which matches l->fixp. */ + if (FX_OPINFO_R_TYPE (f) == BFD_RELOC_LO16 + && f->fx_addsy == l->fixp->fx_addsy + && f->fx_offset == l->fixp->fx_offset + && (pass == 1 + || prev == NULL + || (FX_OPINFO_R_TYPE (prev) != BFD_RELOC_HI16) + || prev->fx_addsy != f->fx_addsy + || prev->fx_offset != f->fx_offset)) + { + fixS ** pf; + + /* Move l->fixp before f. */ + for (pf = &seginfo->fix_root; + * pf != l->fixp; + pf = & (* pf)->fx_next) + assert (* pf != NULL); + + * pf = l->fixp->fx_next; + + l->fixp->fx_next = f; + if (prev == NULL) + seginfo->fix_root = l->fixp; + else + prev->fx_next = l->fixp; + + break; + } + + prev = f; + } + + if (f != NULL) + break; + + if (pass == 1) + as_warn_where (l->fixp->fx_file, l->fixp->fx_line, + _("Unmatched high relocation")); + } + } +} + +/* See whether we need to force a relocation into the output file. */ + +int +mep_force_relocation (fixS *fixp) +{ + if ( fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT + || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) + return 1; + + /* Allow branches to global symbols to be resolved at assembly time. + This is consistent with way relaxable branches are handled, since + branches to both global and local symbols are relaxed. It also + corresponds to the assumptions made in md_pcrel_from_section. */ + return S_FORCE_RELOC (fixp->fx_addsy, !fixp->fx_pcrel); +} + +/* Write a value out to the object file, using the appropriate endianness. */ + +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); +} + +/* Turn a string in input_line_pointer into a floating point constant + of type type, and store the appropriate bytes in *litP. The number + of LITTLENUMS emitted is stored in *sizeP . An error message is + returned, or NULL on OK. */ + +/* Equal to MAX_PRECISION in atof-ieee.c */ +#define MAX_LITTLENUMS 6 + +char * +md_atof (int type, char *litP, int *sizeP) +{ + int i; + int prec; + LITTLENUM_TYPE words [MAX_LITTLENUMS]; + char * t; + + switch (type) + { + case 'f': + case 'F': + case 's': + case 'S': + prec = 2; + break; + + case 'd': + case 'D': + case 'r': + case 'R': + prec = 4; + break; + + /* FIXME: Some targets allow other format chars for bigger sizes here. */ + default: + *sizeP = 0; + return _("Bad call to md_atof()"); + } + + t = atof_ieee (input_line_pointer, type, words); + if (t) + input_line_pointer = t; + * sizeP = prec * sizeof (LITTLENUM_TYPE); + + for (i = 0; i < prec; i++) + { + md_number_to_chars (litP, (valueT) words[i], + sizeof (LITTLENUM_TYPE)); + litP += sizeof (LITTLENUM_TYPE); + } + + return 0; +} + + +bfd_boolean +mep_fix_adjustable (fixS *fixP) +{ + bfd_reloc_code_real_type reloc_type; + + if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) + { + const CGEN_INSN *insn = NULL; + int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; + const CGEN_OPERAND *operand + = cgen_operand_lookup_by_num(gas_cgen_cpu_desc, opindex); + reloc_type = md_cgen_lookup_reloc (insn, operand, fixP); + } + else + reloc_type = fixP->fx_r_type; + + if (fixP->fx_addsy == NULL) + return 1; + + /* Prevent all adjustments to global symbols. */ + if (S_IS_EXTERNAL (fixP->fx_addsy)) + return 0; + + if (S_IS_WEAK (fixP->fx_addsy)) + return 0; + + /* We need the symbol name for the VTABLE entries */ + if (reloc_type == BFD_RELOC_VTABLE_INHERIT + || reloc_type == BFD_RELOC_VTABLE_ENTRY) + return 0; + + return 1; +} + +int +mep_elf_section_letter (int letter, char **ptrmsg) +{ + if (letter == 'v') + return SHF_MEP_VLIW; + + *ptrmsg = _("Bad .section directive: want a,v,w,x,M,S in string"); + return 0; +} + +flagword +mep_elf_section_flags (flagword flags, int attr, int type ATTRIBUTE_UNUSED) +{ + if (attr & SHF_MEP_VLIW) + flags |= SEC_MEP_VLIW; + return flags; +} + +/* In vliw mode, the default section is .vtext. We have to be able + to switch into .vtext using only the .vtext directive. */ + +static segT +mep_vtext_section (void) +{ + static segT vtext_section; + + if (! vtext_section) + { + flagword applicable = bfd_applicable_section_flags (stdoutput); + vtext_section = subseg_new (VTEXT_SECTION_NAME, 0); + bfd_set_section_flags (stdoutput, vtext_section, + applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC + | SEC_CODE | SEC_READONLY + | SEC_MEP_VLIW)); + } + + return vtext_section; +} + +static void +mep_s_vtext (int ignore ATTRIBUTE_UNUSED) +{ + int temp; + + /* Record previous_section and previous_subsection. */ + obj_elf_section_change_hook (); + + temp = get_absolute_expression (); + subseg_set (mep_vtext_section (), (subsegT) temp); + demand_empty_rest_of_line (); +} + +static void +mep_switch_to_core_mode (int dummy ATTRIBUTE_UNUSED) +{ + mep_process_saved_insns (); + pluspresent = 0; + mode = CORE; +} + +static void +mep_switch_to_vliw_mode (int dummy ATTRIBUTE_UNUSED) +{ + if (! MEP_VLIW) + as_bad (_(".vliw unavailable when VLIW is disabled.")); + mode = VLIW; + /* Switch into .vtext here too. */ + /* mep_s_vtext(); */ +} + +/* This is an undocumented pseudo-op used to disable gas's + "disabled_registers" check. Used for code which checks for those + registers at runtime. */ +static void +mep_noregerr (int i ATTRIBUTE_UNUSED) +{ + allow_disabled_registers = 1; +} + +/* mep_unrecognized_line: This is called when a line that can't be parsed + is encountered. We use it to check for a leading '+' sign which indicates + that the current instruction is a coprocessor instruction that is to be + parallelized with a previous core insn. This function accepts the '+' and + rejects all other characters that might indicate garbage at the beginning + of the line. The '+' character gets lost as the calling loop continues, + so we need to indicate that we saw it. */ + +int +mep_unrecognized_line (int ch) +{ + switch (ch) + { + case '+': + pluspresent = 1; + return 1; /* '+' indicates an instruction to be parallelized. */ + default: + return 0; /* If it's not a '+', the line can't be parsed. */ + } +} + +void +mep_cleanup (void) +{ + /* Take care of any insns left to be parallelized when the file ends. + This is mainly here to handle the case where the file ends with an + insn preceeded by a + or the file ends unexpectedly. */ + if (mode == VLIW) + mep_process_saved_insns (); +} + +int +mep_flush_pending_output (void) +{ + if (mode == VLIW) + { + mep_process_saved_insns (); + pluspresent = 0; + } + + return 1; +} diff --git a/gas/config/tc-mep.h b/gas/config/tc-mep.h new file mode 100644 index 0000000..1d48bd4 --- /dev/null +++ b/gas/config/tc-mep.h @@ -0,0 +1,119 @@ +/* tc-mep.h -- Header file for tc-mep.c. + Copyright (C) 2001, 2002, 2005 Free Software Foundation, Inc. + + 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, 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ + +#define TC_MEP + +/* Support computed relocations. */ +#define OBJ_COMPLEX_RELC + +/* Support many operands per instruction. */ +#define GAS_CGEN_MAX_FIXUPS 10 + +#define LISTING_HEADER "MEP GAS " + +/* The target BFD architecture. */ +#define TARGET_ARCH bfd_arch_mep + +#define TARGET_FORMAT (target_big_endian ? "elf32-mep" : "elf32-mep-little") + +/* This is the default. */ +#define TARGET_BYTES_BIG_ENDIAN 1 + +/* Permit temporary numeric labels. */ +#define LOCAL_LABELS_FB 1 + +/* .-foo gets turned into PC relative relocs. */ +#define DIFF_EXPR_OK + +/* We don't need to handle .word strangely. */ +#define WORKING_DOT_WORD + +/* Values passed to md_apply_fix don't include the symbol value. */ +#define MD_APPLY_SYM_VALUE(FIX) 0 + +#define MD_APPLY_FIX +#define md_apply_fix mep_apply_fix +extern void mep_apply_fix (struct fix *, valueT *, segT); + +/* Call md_pcrel_from_section(), not md_pcrel_from(). */ +#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section (FIXP, SEC) +extern long md_pcrel_from_section (struct fix *, segT); + +#define tc_frob_file() mep_frob_file () +extern void mep_frob_file (void); + +#define tc_fix_adjustable(fixP) mep_fix_adjustable (fixP) +extern bfd_boolean mep_fix_adjustable (struct fix *); + +/* After creating a fixup for an instruction operand, we need + to check for HI16 relocs and queue them up for later sorting. */ +#define md_cgen_record_fixup_exp mep_cgen_record_fixup_exp + +/* When relaxing, we need to emit various relocs we otherwise wouldn't. */ +#define TC_FORCE_RELOCATION(fix) mep_force_relocation (fix) +extern int mep_force_relocation (struct fix *); + +#define tc_gen_reloc gas_cgen_tc_gen_reloc + +extern void gas_cgen_md_operand (expressionS *); +#define md_operand(x) gas_cgen_md_operand (x) + +#define md_flush_pending_output() mep_flush_pending_output() +extern int mep_flush_pending_output(void); + +extern const struct relax_type md_relax_table[]; +#define TC_GENERIC_RELAX_TABLE md_relax_table + +/* Account for inserting a jmp after the insn. */ +#define TC_CGEN_MAX_RELAX(insn, len) ((len) + 4) + +extern void mep_prepare_relax_scan (fragS *, offsetT *, relax_substateT); +#define md_prepare_relax_scan(FRAGP, ADDR, AIM, STATE, TYPE) \ + mep_prepare_relax_scan (FRAGP, &AIM, STATE) + +#define skip_whitespace(str) while (*(str) == ' ') ++(str) + +/* Support for core/vliw mode switching. */ +#define CORE 0 +#define VLIW 1 +#define MAX_PARALLEL_INSNS 56 /* From email from Toshiba. */ +#define VTEXT_SECTION_NAME ".vtext" + +/* Needed to process pending instructions when a label is encountered. */ +#define TC_START_LABEL(ch, ptr) ((ch == ':') && mep_flush_pending_output ()) + +#define tc_unrecognized_line(c) mep_unrecognized_line (c) +extern int mep_unrecognized_line (int); +#define md_cleanup mep_cleanup +extern void mep_cleanup (void); + +#define md_elf_section_letter mep_elf_section_letter +extern int mep_elf_section_letter (int, char **); +#define md_elf_section_flags mep_elf_section_flags +extern flagword mep_elf_section_flags (flagword, int, int); + +#define ELF_TC_SPECIAL_SECTIONS \ + { VTEXT_SECTION_NAME, SHT_PROGBITS, SHF_ALLOC|SHF_EXECINSTR|SHF_MEP_VLIW }, + +/* The values of the following enum are for use with parinsnum, which + is a variable in md_assemble that keeps track of whether or not the + next instruction is expected to be the first or second instrucion in + a parallelization group. */ +typedef enum exp_par_insn_{FIRST, SECOND} EXP_PAR_INSN; |