1/* Assembler interface for targets using CGEN. -*- C -*- 2 CGEN: Cpu tools GENerator 3 4THIS FILE IS MACHINE GENERATED WITH CGEN. 5- the resultant file is machine generated, cgen-asm.in isn't 6 7Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. 8 9This file is part of the GNU Binutils and GDB, the GNU debugger. 10 11This program is free software; you can redistribute it and/or modify 12it under the terms of the GNU General Public License as published by 13the Free Software Foundation; either version 2, or (at your option) 14any later version. 15 16This program is distributed in the hope that it will be useful, 17but WITHOUT ANY WARRANTY; without even the implied warranty of 18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19GNU General Public License for more details. 20 21You should have received a copy of the GNU General Public License 22along with this program; if not, write to the Free Software Foundation, Inc., 2359 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 24 25/* ??? Eventually more and more of this stuff can go to cpu-independent files. 26 Keep that in mind. */ 27 28#include "sysdep.h" 29#include <ctype.h> 30#include <stdio.h> 31#include "ansidecl.h" 32#include "bfd.h" 33#include "symcat.h" 34#include "@prefix@-desc.h" 35#include "@prefix@-opc.h" 36#include "opintl.h" 37 38#undef min 39#define min(a,b) ((a) < (b) ? (a) : (b)) 40#undef max 41#define max(a,b) ((a) > (b) ? (a) : (b)) 42 43static const char * parse_insn_normal 44 PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *)); 45 46/* -- assembler routines inserted here */ 47 48/* Default insn parser. 49 50 The syntax string is scanned and operands are parsed and stored in FIELDS. 51 Relocs are queued as we go via other callbacks. 52 53 ??? Note that this is currently an all-or-nothing parser. If we fail to 54 parse the instruction, we return 0 and the caller will start over from 55 the beginning. Backtracking will be necessary in parsing subexpressions, 56 but that can be handled there. Not handling backtracking here may get 57 expensive in the case of the m68k. Deal with later. 58 59 Returns NULL for success, an error message for failure. 60*/ 61 62static const char * 63parse_insn_normal (cd, insn, strp, fields) 64 CGEN_CPU_DESC cd; 65 const CGEN_INSN *insn; 66 const char **strp; 67 CGEN_FIELDS *fields; 68{ 69 /* ??? Runtime added insns not handled yet. */ 70 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); 71 const char *str = *strp; 72 const char *errmsg; 73 const char *p; 74 const CGEN_SYNTAX_CHAR_TYPE * syn; 75#ifdef CGEN_MNEMONIC_OPERANDS 76 /* FIXME: wip */ 77 int past_opcode_p; 78#endif 79 80 /* For now we assume the mnemonic is first (there are no leading operands). 81 We can parse it without needing to set up operand parsing. 82 GAS's input scrubber will ensure mnemonics are lowercase, but we may 83 not be called from GAS. */ 84 p = CGEN_INSN_MNEMONIC (insn); 85 while (*p && tolower (*p) == tolower (*str)) 86 ++p, ++str; 87 88 if (* p) 89 return _("unrecognized instruction"); 90 91#ifndef CGEN_MNEMONIC_OPERANDS 92 if (* str && !isspace (* str)) 93 return _("unrecognized instruction"); 94#endif 95 96 CGEN_INIT_PARSE (cd); 97 cgen_init_parse_operand (cd); 98#ifdef CGEN_MNEMONIC_OPERANDS 99 past_opcode_p = 0; 100#endif 101 102 /* We don't check for (*str != '\0') here because we want to parse 103 any trailing fake arguments in the syntax string. */ 104 syn = CGEN_SYNTAX_STRING (syntax); 105 106 /* Mnemonics come first for now, ensure valid string. */ 107 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 108 abort (); 109 110 ++syn; 111 112 while (* syn != 0) 113 { 114 /* Non operand chars must match exactly. */ 115 if (CGEN_SYNTAX_CHAR_P (* syn)) 116 { 117 /* FIXME: While we allow for non-GAS callers above, we assume the 118 first char after the mnemonic part is a space. */ 119 /* FIXME: We also take inappropriate advantage of the fact that 120 GAS's input scrubber will remove extraneous blanks. */ 121 if (tolower (*str) == tolower (CGEN_SYNTAX_CHAR (* syn))) 122 { 123#ifdef CGEN_MNEMONIC_OPERANDS 124 if (CGEN_SYNTAX_CHAR(* syn) == ' ') 125 past_opcode_p = 1; 126#endif 127 ++ syn; 128 ++ str; 129 } 130 else if (*str) 131 { 132 /* Syntax char didn't match. Can't be this insn. */ 133 static char msg [80]; 134 /* xgettext:c-format */ 135 sprintf (msg, _("syntax error (expected char `%c', found `%c')"), 136 CGEN_SYNTAX_CHAR(*syn), *str); 137 return msg; 138 } 139 else 140 { 141 /* Ran out of input. */ 142 static char msg [80]; 143 /* xgettext:c-format */ 144 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"), 145 CGEN_SYNTAX_CHAR(*syn)); 146 return msg; 147 } 148 continue; 149 } 150 151 /* We have an operand of some sort. */ 152 errmsg = @arch@_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), 153 &str, fields); 154 if (errmsg) 155 return errmsg; 156 157 /* Done with this operand, continue with next one. */ 158 ++ syn; 159 } 160 161 /* If we're at the end of the syntax string, we're done. */ 162 if (* syn == 0) 163 { 164 /* FIXME: For the moment we assume a valid `str' can only contain 165 blanks now. IE: We needn't try again with a longer version of 166 the insn and it is assumed that longer versions of insns appear 167 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ 168 while (isspace (* str)) 169 ++ str; 170 171 if (* str != '\0') 172 return _("junk at end of line"); /* FIXME: would like to include `str' */ 173 174 return NULL; 175 } 176 177 /* We couldn't parse it. */ 178 return _("unrecognized instruction"); 179} 180 181/* Main entry point. 182 This routine is called for each instruction to be assembled. 183 STR points to the insn to be assembled. 184 We assume all necessary tables have been initialized. 185 The assembled instruction, less any fixups, is stored in BUF. 186 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value 187 still needs to be converted to target byte order, otherwise BUF is an array 188 of bytes in target byte order. 189 The result is a pointer to the insn's entry in the opcode table, 190 or NULL if an error occured (an error message will have already been 191 printed). 192 193 Note that when processing (non-alias) macro-insns, 194 this function recurses. 195 196 ??? It's possible to make this cpu-independent. 197 One would have to deal with a few minor things. 198 At this point in time doing so would be more of a curiosity than useful 199 [for example this file isn't _that_ big], but keeping the possibility in 200 mind helps keep the design clean. */ 201 202const CGEN_INSN * 203@arch@_cgen_assemble_insn (cd, str, fields, buf, errmsg) 204 CGEN_CPU_DESC cd; 205 const char *str; 206 CGEN_FIELDS *fields; 207 CGEN_INSN_BYTES_PTR buf; 208 char **errmsg; 209{ 210 const char *start; 211 CGEN_INSN_LIST *ilist; 212 const char *parse_errmsg = NULL; 213 const char *insert_errmsg = NULL; 214 215 /* Skip leading white space. */ 216 while (isspace (* str)) 217 ++ str; 218 219 /* The instructions are stored in hashed lists. 220 Get the first in the list. */ 221 ilist = CGEN_ASM_LOOKUP_INSN (cd, str); 222 223 /* Keep looking until we find a match. */ 224 225 start = str; 226 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) 227 { 228 const CGEN_INSN *insn = ilist->insn; 229 230#ifdef CGEN_VALIDATE_INSN_SUPPORTED 231 /* not usually needed as unsupported opcodes shouldn't be in the hash lists */ 232 /* Is this insn supported by the selected cpu? */ 233 if (! @arch@_cgen_insn_supported (cd, insn)) 234 continue; 235#endif 236 237 /* If the RELAX attribute is set, this is an insn that shouldn't be 238 chosen immediately. Instead, it is used during assembler/linker 239 relaxation if possible. */ 240 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0) 241 continue; 242 243 str = start; 244 245 /* Allow parse/insert handlers to obtain length of insn. */ 246 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); 247 248 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); 249 if (parse_errmsg != NULL) 250 continue; 251 252 /* ??? 0 is passed for `pc' */ 253 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, 254 (bfd_vma) 0); 255 if (insert_errmsg != NULL) 256 continue; 257 258 /* It is up to the caller to actually output the insn and any 259 queued relocs. */ 260 return insn; 261 } 262 263 { 264 static char errbuf[150]; 265 const char *tmp_errmsg; 266 267#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS 268 /* If requesting verbose error messages, use insert_errmsg. 269 Failing that, use parse_errmsg */ 270 tmp_errmsg = (insert_errmsg ? insert_errmsg : 271 parse_errmsg ? parse_errmsg : 272 _("unrecognized instruction")); 273 274 if (strlen (start) > 50) 275 /* xgettext:c-format */ 276 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start); 277 else 278 /* xgettext:c-format */ 279 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start); 280#else 281 if (strlen (start) > 50) 282 /* xgettext:c-format */ 283 sprintf (errbuf, _("bad instruction `%.50s...'"), start); 284 else 285 /* xgettext:c-format */ 286 sprintf (errbuf, _("bad instruction `%.50s'"), start); 287#endif 288 289 *errmsg = errbuf; 290 return NULL; 291 } 292} 293 294#if 0 /* This calls back to GAS which we can't do without care. */ 295 296/* Record each member of OPVALS in the assembler's symbol table. 297 This lets GAS parse registers for us. 298 ??? Interesting idea but not currently used. */ 299 300/* Record each member of OPVALS in the assembler's symbol table. 301 FIXME: Not currently used. */ 302 303void 304@arch@_cgen_asm_hash_keywords (cd, opvals) 305 CGEN_CPU_DESC cd; 306 CGEN_KEYWORD *opvals; 307{ 308 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL); 309 const CGEN_KEYWORD_ENTRY * ke; 310 311 while ((ke = cgen_keyword_search_next (& search)) != NULL) 312 { 313#if 0 /* Unnecessary, should be done in the search routine. */ 314 if (! @arch@_cgen_opval_supported (ke)) 315 continue; 316#endif 317 cgen_asm_record_register (cd, ke->name, ke->value); 318 } 319} 320 321#endif /* 0 */ 322