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Diffstat (limited to 'opcodes/ip2k-asm.c')
| -rw-r--r-- | opcodes/ip2k-asm.c | 977 |
1 files changed, 977 insertions, 0 deletions
diff --git a/opcodes/ip2k-asm.c b/opcodes/ip2k-asm.c new file mode 100644 index 0000000..c2163b0 --- /dev/null +++ b/opcodes/ip2k-asm.c @@ -0,0 +1,977 @@ +/* Assembler interface for targets using CGEN. -*- C -*- + CGEN: Cpu tools GENerator + +THIS FILE IS MACHINE GENERATED WITH CGEN. +- the resultant file is machine generated, cgen-asm.in isn't + +Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. + +This file is part of the GNU Binutils and GDB, the GNU debugger. + +This program 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. + +This program 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 this program; if not, write to the Free Software Foundation, Inc., +59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* ??? Eventually more and more of this stuff can go to cpu-independent files. + Keep that in mind. */ + +#include "sysdep.h" +#include <stdio.h> +#include "ansidecl.h" +#include "bfd.h" +#include "symcat.h" +#include "ip2k-desc.h" +#include "ip2k-opc.h" +#include "opintl.h" +#include "xregex.h" +#include "libiberty.h" +#include "safe-ctype.h" + +#undef min +#define min(a,b) ((a) < (b) ? (a) : (b)) +#undef max +#define max(a,b) ((a) > (b) ? (a) : (b)) + +static const char * parse_insn_normal + PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *)); + +/* -- assembler routines inserted here. */ + +/* -- asm.c */ + +static const char * +parse_fr (cd, strp, opindex, valuep) + CGEN_CPU_DESC cd; + const char **strp; + int opindex; + long *valuep; +{ + const char *errmsg; + char *old_strp; + char *afteroffset; + enum cgen_parse_operand_result result_type; + bfd_vma value; + extern CGEN_KEYWORD ip2k_cgen_opval_register_names; + long tempvalue; + + old_strp = *strp; + afteroffset = NULL; + + + /* Check here to see if you're about to try parsing a w as the first arg */ + /* and return an error if you are. */ + if ( (strncmp(*strp,"w",1)==0) || (strncmp(*strp,"W",1)==0) ) + { + (*strp)++; + + if ( (strncmp(*strp,",",1)==0) || isspace(**strp) ) + { + /* We've been passed a w. Return with an error message so that */ + /* cgen will try the next parsing option. */ + errmsg = _("W keyword invalid in FR operand slot."); + return errmsg; + } + *strp = old_strp; + } + + + /* Attempt parse as register keyword. */ + /* old_strp = *strp; */ + + errmsg = cgen_parse_keyword (cd, strp, & ip2k_cgen_opval_register_names, valuep); + if ( *strp != NULL ) + if (errmsg == NULL) + return errmsg; + + /* Attempt to parse for "(IP)" */ + afteroffset = strstr(*strp,"(IP)"); + + if ( afteroffset == NULL) + { + /* Make sure it's not in lower case */ + afteroffset = strstr(*strp,"(ip)"); + } + + if ( afteroffset != NULL ) + { + if ( afteroffset != *strp ) + { + /* Invalid offset present.*/ + errmsg = _("offset(IP) is not a valid form"); + return errmsg; + } + else + { + *strp += 4; + *valuep = 0; + errmsg = NULL; + return errmsg; + } + } + + /* Attempt to parse for DP. ex: mov w, offset(DP) */ + /* mov offset(DP),w */ + + /* Try parsing it as an address and see what comes back */ + + afteroffset = strstr(*strp,"(DP)"); + + if ( afteroffset == NULL) + { + /* Maybe it's in lower case */ + afteroffset = strstr(*strp,"(dp)"); + } + + if ( afteroffset != NULL ) + { + if ( afteroffset == *strp ) + { + /* No offset present. Use 0 by default. */ + tempvalue = 0; + errmsg = NULL; + } + else + { + errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR_OFFSET, + & result_type, & tempvalue); + } + + if (errmsg == NULL) + { + if ( (tempvalue >= 0) && (tempvalue <= 127) ) + { + /* Value is ok. Fix up the first 2 bits and return */ + *valuep = 0x0100 | tempvalue; + *strp += 4; /* skip over the (DP) in *strp */ + return errmsg; + } else + { + /* Found something there in front of (DP) but it's out of range. */ + errmsg = _("(DP) offset out of range."); + return errmsg; + } + + } + } + + + /* Attempt to parse for SP. ex: mov w, offset(SP) */ + /* mov offset(SP), w */ + + + afteroffset = strstr(*strp,"(SP)"); + + if (afteroffset == NULL) + { + /* Maybe it's in lower case. */ + afteroffset = strstr(*strp, "(sp)"); + } + + if ( afteroffset != NULL ) + { + if ( afteroffset == *strp ) + { + /* No offset present. Use 0 by default. */ + tempvalue = 0; + errmsg = NULL; + } + else + { + errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR_OFFSET, + & result_type, & tempvalue); + } + if (errmsg == NULL) + { + if ( (tempvalue >= 0) && (tempvalue <= 127) ) + { + /* Value is ok. Fix up the first 2 bits and return */ + *valuep = 0x0180 | tempvalue; + *strp += 4; /* skip over the (SP) in *strp */ + return errmsg; + } else + { + /* Found something there in front of (SP) but it's out of range. */ + errmsg = _("(SP) offset out of range."); + return errmsg; + } + + } + } + + + /* Attempt to parse as an address. */ + *strp = old_strp; + errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR9, + & result_type, & value); + if (errmsg == NULL) + { + *valuep = value; + + /* if a parenthesis is found, warn about invalid form */ + + if (**strp == '(') + { + errmsg = _("illegal use of parentheses"); + } + /* if a numeric value is specified, ensure that it is between 1 and 255 */ + else if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) + { + if (value < 0x1 || value > 0xff) + errmsg = _("operand out of range (not between 1 and 255)"); + } + } + return errmsg; +} + +static const char * +parse_addr16 (cd, strp, opindex, valuep) + CGEN_CPU_DESC cd; + const char **strp; + int opindex; + long *valuep; +{ + const char *errmsg; + enum cgen_parse_operand_result result_type; + bfd_reloc_code_real_type code = BFD_RELOC_NONE; + long value; + + if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16H ) + code = BFD_RELOC_IP2K_HI8DATA; + else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16L ) + code = BFD_RELOC_IP2K_LO8DATA; + else + { + /* Something is very wrong. opindex has to be one of the above. */ + errmsg = _("parse_addr16: invalid opindex."); + return errmsg; + } + + errmsg = cgen_parse_address (cd, strp, opindex, code, + & result_type, & value); + if (errmsg == NULL) + { + /* We either have a relocation or a number now. */ + if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER ) + { + /* We got a number back. */ + if ( code == BFD_RELOC_IP2K_HI8DATA ) + value >>= 8; + else /* code = BFD_RELOC_IP2K_LOW8DATA */ + value &= 0x00FF; + } + *valuep = value; + } + + return errmsg; +} + + + static const char * + parse_addr16_p (cd, strp, opindex, valuep) + CGEN_CPU_DESC cd; + const char **strp; + int opindex; + long *valuep; + { + const char *errmsg; + enum cgen_parse_operand_result result_type; + bfd_reloc_code_real_type code = BFD_RELOC_IP2K_PAGE3; + long value; + + errmsg = cgen_parse_address (cd, strp, opindex, code, + & result_type, & value); + if (errmsg == NULL) + { + if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER ) + *valuep = (value >> 13) & 0x7; + else if ( result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED ) + *valuep = value; + } + return errmsg; + } + + + static const char * + parse_addr16_cjp (cd, strp, opindex, valuep) + CGEN_CPU_DESC cd; + const char **strp; + int opindex; + long *valuep; + { + const char *errmsg; + enum cgen_parse_operand_result result_type; + bfd_reloc_code_real_type code = BFD_RELOC_NONE; + long value; + + if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16CJP ) + code = BFD_RELOC_IP2K_ADDR16CJP; + else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16P ) + code = BFD_RELOC_IP2K_PAGE3; + + errmsg = cgen_parse_address (cd, strp, opindex, code, + & result_type, & value); + if (errmsg == NULL) + { + if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER ) + { + if ( (value & 0x1) == 0) /* If the address is even .... */ + { + if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16CJP ) + *valuep = (value >> 1) & 0x1FFF; /* Should mask be 1FFF? */ + else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16P ) + *valuep = (value >> 14) & 0x7; + } + else + errmsg = _("Byte address required. - must be even."); + }else if ( result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED ) + { + /* This will happen for things like (s2-s1) where s2 and s1 */ + /* are labels. */ + *valuep = value; + } + else + errmsg = _("cgen_parse_address returned a symbol. Literal required."); + } + return errmsg; + } + + +static const char * +parse_lit8 (cd, strp, opindex, valuep) + CGEN_CPU_DESC cd; + const char **strp; + int opindex; + long *valuep; +{ + const char *errmsg; + enum cgen_parse_operand_result result_type; + bfd_reloc_code_real_type code = BFD_RELOC_NONE; + long value; + + /* Parse %OP relocating operators. */ + if (strncmp (*strp, "%bank", 5) == 0) + { + *strp += 5; + code = BFD_RELOC_IP2K_BANK; + } + else if (strncmp (*strp, "%lo8data", 8) == 0) + { + *strp += 8; + code = BFD_RELOC_IP2K_LO8DATA; + } + else if (strncmp (*strp, "%hi8data", 8) == 0) + { + *strp += 8; + code = BFD_RELOC_IP2K_HI8DATA; + } + else if (strncmp (*strp, "%ex8data", 8) == 0) + { + *strp += 8; + code = BFD_RELOC_IP2K_EX8DATA; + } + else if (strncmp (*strp, "%lo8insn", 8) == 0) + { + *strp += 8; + code = BFD_RELOC_IP2K_LO8INSN; + } + else if (strncmp (*strp, "%hi8insn", 8) == 0) + { + *strp += 8; + code = BFD_RELOC_IP2K_HI8INSN; + } + + + /* Parse %op operand. */ + if (code != BFD_RELOC_NONE) + { + errmsg = cgen_parse_address (cd, strp, opindex, code, + & result_type, & value); + if ((errmsg == NULL) && + (result_type != CGEN_PARSE_OPERAND_RESULT_QUEUED)) + errmsg = _("%operator operand is not a symbol"); + + *valuep = value; + } + /* Parse as a number. */ + else + { + errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep); + + /* Truncate to eight bits to accept both signed and unsigned input. */ + if (errmsg == NULL) + *valuep &= 0xFF; + } + + return errmsg; +} + +static const char * +parse_bit3 (cd, strp, opindex, valuep) + CGEN_CPU_DESC cd; + const char **strp; + int opindex; + long *valuep; +{ + const char *errmsg; + char mode = 0; + long count = 0; + unsigned long value; + + if (strncmp (*strp, "%bit", 4) == 0) + { + *strp += 4; + mode = 1; + } + else if (strncmp (*strp, "%msbbit", 7) == 0) + { + *strp += 7; + mode = 1; + } + else if (strncmp (*strp, "%lsbbit", 7) == 0) + { + *strp += 7; + mode = 2; + } + + errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep); + if (errmsg) { + return errmsg; + } + + if (mode) { + value = (unsigned long) *valuep; + if (value == 0) { + errmsg = _("Attempt to find bit index of 0"); + return errmsg; + } + + if (mode == 1) { + count = 31; + while ((value & 0x80000000) == 0) { + count--; + value <<= 1; + } + } else if (mode == 2) { + count = 0; + while ((value & 0x00000001) == 0) { + count++; + value >>= 1; + } + } + + *valuep = count; + } + + return errmsg; +} + + +/* -- dis.c */ + +const char * ip2k_cgen_parse_operand + PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *)); + +/* Main entry point for operand parsing. + + This function is basically just a big switch statement. Earlier versions + used tables to look up the function to use, but + - if the table contains both assembler and disassembler functions then + the disassembler contains much of the assembler and vice-versa, + - there's a lot of inlining possibilities as things grow, + - using a switch statement avoids the function call overhead. + + This function could be moved into `parse_insn_normal', but keeping it + separate makes clear the interface between `parse_insn_normal' and each of + the handlers. */ + +const char * +ip2k_cgen_parse_operand (cd, opindex, strp, fields) + CGEN_CPU_DESC cd; + int opindex; + const char ** strp; + CGEN_FIELDS * fields; +{ + const char * errmsg = NULL; + /* Used by scalar operands that still need to be parsed. */ + long junk ATTRIBUTE_UNUSED; + + switch (opindex) + { + case IP2K_OPERAND_ADDR16CJP : + errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16CJP, &fields->f_addr16cjp); + break; + case IP2K_OPERAND_ADDR16H : + errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16H, &fields->f_imm8); + break; + case IP2K_OPERAND_ADDR16L : + errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16L, &fields->f_imm8); + break; + case IP2K_OPERAND_ADDR16P : + errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16P, &fields->f_page3); + break; + case IP2K_OPERAND_BITNO : + errmsg = parse_bit3 (cd, strp, IP2K_OPERAND_BITNO, &fields->f_bitno); + break; + case IP2K_OPERAND_CBIT : + errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_CBIT, &junk); + break; + case IP2K_OPERAND_DCBIT : + errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_DCBIT, &junk); + break; + case IP2K_OPERAND_FR : + errmsg = parse_fr (cd, strp, IP2K_OPERAND_FR, &fields->f_reg); + break; + case IP2K_OPERAND_LIT8 : + errmsg = parse_lit8 (cd, strp, IP2K_OPERAND_LIT8, &fields->f_imm8); + break; + case IP2K_OPERAND_PABITS : + errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_PABITS, &junk); + break; + case IP2K_OPERAND_RETI3 : + errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_RETI3, &fields->f_reti3); + break; + case IP2K_OPERAND_ZBIT : + errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_ZBIT, &junk); + break; + + default : + /* xgettext:c-format */ + fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex); + abort (); + } + + return errmsg; +} + +cgen_parse_fn * const ip2k_cgen_parse_handlers[] = +{ + parse_insn_normal, +}; + +void +ip2k_cgen_init_asm (cd) + CGEN_CPU_DESC cd; +{ + ip2k_cgen_init_opcode_table (cd); + ip2k_cgen_init_ibld_table (cd); + cd->parse_handlers = & ip2k_cgen_parse_handlers[0]; + cd->parse_operand = ip2k_cgen_parse_operand; +} + + + +/* Regex construction routine. + + This translates an opcode syntax string into a regex string, + by replacing any non-character syntax element (such as an + opcode) with the pattern '.*' + + It then compiles the regex and stores it in the opcode, for + later use by ip2k_cgen_assemble_insn + + Returns NULL for success, an error message for failure. */ + +char * +ip2k_cgen_build_insn_regex (insn) + CGEN_INSN *insn; +{ + CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn); + const char *mnem = CGEN_INSN_MNEMONIC (insn); + char rxbuf[CGEN_MAX_RX_ELEMENTS]; + char *rx = rxbuf; + const CGEN_SYNTAX_CHAR_TYPE *syn; + int reg_err; + + syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc)); + + /* Mnemonics come first in the syntax string. */ + if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) + return _("missing mnemonic in syntax string"); + ++syn; + + /* Generate a case sensitive regular expression that emulates case + insensitive matching in the "C" locale. We cannot generate a case + insensitive regular expression because in Turkish locales, 'i' and 'I' + are not equal modulo case conversion. */ + + /* Copy the literal mnemonic out of the insn. */ + for (; *mnem; mnem++) + { + char c = *mnem; + + if (ISALPHA (c)) + { + *rx++ = '['; + *rx++ = TOLOWER (c); + *rx++ = TOUPPER (c); + *rx++ = ']'; + } + else + *rx++ = c; + } + + /* Copy any remaining literals from the syntax string into the rx. */ + for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn) + { + if (CGEN_SYNTAX_CHAR_P (* syn)) + { + char c = CGEN_SYNTAX_CHAR (* syn); + + switch (c) + { + /* Escape any regex metacharacters in the syntax. */ + case '.': case '[': case '\\': + case '*': case '^': case '$': + +#ifdef CGEN_ESCAPE_EXTENDED_REGEX + case '?': case '{': case '}': + case '(': case ')': case '*': + case '|': case '+': case ']': +#endif + *rx++ = '\\'; + *rx++ = c; + break; + + default: + if (ISALPHA (c)) + { + *rx++ = '['; + *rx++ = TOLOWER (c); + *rx++ = TOUPPER (c); + *rx++ = ']'; + } + else + *rx++ = c; + break; + } + } + else + { + /* Replace non-syntax fields with globs. */ + *rx++ = '.'; + *rx++ = '*'; + } + } + + /* Trailing whitespace ok. */ + * rx++ = '['; + * rx++ = ' '; + * rx++ = '\t'; + * rx++ = ']'; + * rx++ = '*'; + + /* But anchor it after that. */ + * rx++ = '$'; + * rx = '\0'; + + CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t)); + reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB); + + if (reg_err == 0) + return NULL; + else + { + static char msg[80]; + + regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80); + regfree ((regex_t *) CGEN_INSN_RX (insn)); + free (CGEN_INSN_RX (insn)); + (CGEN_INSN_RX (insn)) = NULL; + return msg; + } +} + + +/* Default insn parser. + + The syntax string is scanned and operands are parsed and stored in FIELDS. + Relocs are queued as we go via other callbacks. + + ??? Note that this is currently an all-or-nothing parser. If we fail to + parse the instruction, we return 0 and the caller will start over from + the beginning. Backtracking will be necessary in parsing subexpressions, + but that can be handled there. Not handling backtracking here may get + expensive in the case of the m68k. Deal with later. + + Returns NULL for success, an error message for failure. */ + +static const char * +parse_insn_normal (cd, insn, strp, fields) + CGEN_CPU_DESC cd; + const CGEN_INSN *insn; + const char **strp; + CGEN_FIELDS *fields; +{ + /* ??? Runtime added insns not handled yet. */ + const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); + const char *str = *strp; + const char *errmsg; + const char *p; + const CGEN_SYNTAX_CHAR_TYPE * syn; +#ifdef CGEN_MNEMONIC_OPERANDS + /* FIXME: wip */ + int past_opcode_p; +#endif + + /* For now we assume the mnemonic is first (there are no leading operands). + We can parse it without needing to set up operand parsing. + GAS's input scrubber will ensure mnemonics are lowercase, but we may + not be called from GAS. */ + p = CGEN_INSN_MNEMONIC (insn); + while (*p && TOLOWER (*p) == TOLOWER (*str)) + ++p, ++str; + + if (* p) + return _("unrecognized instruction"); + +#ifndef CGEN_MNEMONIC_OPERANDS + if (* str && ! ISSPACE (* str)) + return _("unrecognized instruction"); +#endif + + CGEN_INIT_PARSE (cd); + cgen_init_parse_operand (cd); +#ifdef CGEN_MNEMONIC_OPERANDS + past_opcode_p = 0; +#endif + + /* We don't check for (*str != '\0') here because we want to parse + any trailing fake arguments in the syntax string. */ + syn = CGEN_SYNTAX_STRING (syntax); + + /* Mnemonics come first for now, ensure valid string. */ + if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) + abort (); + + ++syn; + + while (* syn != 0) + { + /* Non operand chars must match exactly. */ + if (CGEN_SYNTAX_CHAR_P (* syn)) + { + /* FIXME: While we allow for non-GAS callers above, we assume the + first char after the mnemonic part is a space. */ + /* FIXME: We also take inappropriate advantage of the fact that + GAS's input scrubber will remove extraneous blanks. */ + if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn))) + { +#ifdef CGEN_MNEMONIC_OPERANDS + if (CGEN_SYNTAX_CHAR(* syn) == ' ') + past_opcode_p = 1; +#endif + ++ syn; + ++ str; + } + else if (*str) + { + /* Syntax char didn't match. Can't be this insn. */ + static char msg [80]; + + /* xgettext:c-format */ + sprintf (msg, _("syntax error (expected char `%c', found `%c')"), + CGEN_SYNTAX_CHAR(*syn), *str); + return msg; + } + else + { + /* Ran out of input. */ + static char msg [80]; + + /* xgettext:c-format */ + sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"), + CGEN_SYNTAX_CHAR(*syn)); + return msg; + } + continue; + } + + /* We have an operand of some sort. */ + errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), + &str, fields); + if (errmsg) + return errmsg; + + /* Done with this operand, continue with next one. */ + ++ syn; + } + + /* If we're at the end of the syntax string, we're done. */ + if (* syn == 0) + { + /* FIXME: For the moment we assume a valid `str' can only contain + blanks now. IE: We needn't try again with a longer version of + the insn and it is assumed that longer versions of insns appear + before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ + while (ISSPACE (* str)) + ++ str; + + if (* str != '\0') + return _("junk at end of line"); /* FIXME: would like to include `str' */ + + return NULL; + } + + /* We couldn't parse it. */ + return _("unrecognized instruction"); +} + +/* Main entry point. + This routine is called for each instruction to be assembled. + STR points to the insn to be assembled. + We assume all necessary tables have been initialized. + The assembled instruction, less any fixups, is stored in BUF. + Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value + still needs to be converted to target byte order, otherwise BUF is an array + of bytes in target byte order. + The result is a pointer to the insn's entry in the opcode table, + or NULL if an error occured (an error message will have already been + printed). + + Note that when processing (non-alias) macro-insns, + this function recurses. + + ??? It's possible to make this cpu-independent. + One would have to deal with a few minor things. + At this point in time doing so would be more of a curiosity than useful + [for example this file isn't _that_ big], but keeping the possibility in + mind helps keep the design clean. */ + +const CGEN_INSN * +ip2k_cgen_assemble_insn (cd, str, fields, buf, errmsg) + CGEN_CPU_DESC cd; + const char *str; + CGEN_FIELDS *fields; + CGEN_INSN_BYTES_PTR buf; + char **errmsg; +{ + const char *start; + CGEN_INSN_LIST *ilist; + const char *parse_errmsg = NULL; + const char *insert_errmsg = NULL; + int recognized_mnemonic = 0; + + /* Skip leading white space. */ + while (ISSPACE (* str)) + ++ str; + + /* The instructions are stored in hashed lists. + Get the first in the list. */ + ilist = CGEN_ASM_LOOKUP_INSN (cd, str); + + /* Keep looking until we find a match. */ + start = str; + for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) + { + const CGEN_INSN *insn = ilist->insn; + recognized_mnemonic = 1; + +#ifdef CGEN_VALIDATE_INSN_SUPPORTED + /* Not usually needed as unsupported opcodes + shouldn't be in the hash lists. */ + /* Is this insn supported by the selected cpu? */ + if (! ip2k_cgen_insn_supported (cd, insn)) + continue; +#endif + /* If the RELAX attribute is set, this is an insn that shouldn't be + chosen immediately. Instead, it is used during assembler/linker + relaxation if possible. */ + if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0) + continue; + + 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); + + parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); + if (parse_errmsg != NULL) + continue; + + /* ??? 0 is passed for `pc'. */ + insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, + (bfd_vma) 0); + if (insert_errmsg != NULL) + continue; + + /* It is up to the caller to actually output the insn and any + queued relocs. */ + return insn; + } + + { + static char errbuf[150]; +#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS + const char *tmp_errmsg; + + /* If requesting verbose error messages, use insert_errmsg. + Failing that, use parse_errmsg. */ + tmp_errmsg = (insert_errmsg ? insert_errmsg : + parse_errmsg ? parse_errmsg : + recognized_mnemonic ? + _("unrecognized form of instruction") : + _("unrecognized instruction")); + + if (strlen (start) > 50) + /* xgettext:c-format */ + sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start); + else + /* xgettext:c-format */ + sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start); +#else + if (strlen (start) > 50) + /* xgettext:c-format */ + sprintf (errbuf, _("bad instruction `%.50s...'"), start); + else + /* xgettext:c-format */ + sprintf (errbuf, _("bad instruction `%.50s'"), start); +#endif + + *errmsg = errbuf; + return NULL; + } +} + +#if 0 /* This calls back to GAS which we can't do without care. */ + +/* Record each member of OPVALS in the assembler's symbol table. + This lets GAS parse registers for us. + ??? Interesting idea but not currently used. */ + +/* Record each member of OPVALS in the assembler's symbol table. + FIXME: Not currently used. */ + +void +ip2k_cgen_asm_hash_keywords (cd, opvals) + CGEN_CPU_DESC cd; + CGEN_KEYWORD *opvals; +{ + CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL); + const CGEN_KEYWORD_ENTRY * ke; + + while ((ke = cgen_keyword_search_next (& search)) != NULL) + { +#if 0 /* Unnecessary, should be done in the search routine. */ + if (! ip2k_cgen_opval_supported (ke)) + continue; +#endif + cgen_asm_record_register (cd, ke->name, ke->value); + } +} + +#endif /* 0 */ |