| 1 | /* CGEN generic opcode support. |
| 2 | |
| 3 | Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU Binutils and GDB, the GNU debugger. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License along |
| 18 | with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "sysdep.h" |
| 22 | #include <ctype.h> |
| 23 | #include <stdio.h> |
| 24 | #include "ansidecl.h" |
| 25 | #include "libiberty.h" |
| 26 | #include "bfd.h" |
| 27 | #include "symcat.h" |
| 28 | #include "opcode/cgen.h" |
| 29 | |
| 30 | static unsigned int hash_keyword_name |
| 31 | PARAMS ((const CGEN_KEYWORD *, const char *, int)); |
| 32 | static unsigned int hash_keyword_value |
| 33 | PARAMS ((const CGEN_KEYWORD *, unsigned int)); |
| 34 | static void build_keyword_hash_tables |
| 35 | PARAMS ((CGEN_KEYWORD *)); |
| 36 | |
| 37 | /* Return number of hash table entries to use for N elements. */ |
| 38 | #define KEYWORD_HASH_SIZE(n) ((n) <= 31 ? 17 : 31) |
| 39 | |
| 40 | /* Look up *NAMEP in the keyword table KT. |
| 41 | The result is the keyword entry or NULL if not found. */ |
| 42 | |
| 43 | const CGEN_KEYWORD_ENTRY * |
| 44 | cgen_keyword_lookup_name (kt, name) |
| 45 | CGEN_KEYWORD *kt; |
| 46 | const char *name; |
| 47 | { |
| 48 | const CGEN_KEYWORD_ENTRY *ke; |
| 49 | const char *p,*n; |
| 50 | |
| 51 | if (kt->name_hash_table == NULL) |
| 52 | build_keyword_hash_tables (kt); |
| 53 | |
| 54 | ke = kt->name_hash_table[hash_keyword_name (kt, name, 0)]; |
| 55 | |
| 56 | /* We do case insensitive comparisons. |
| 57 | If that ever becomes a problem, add an attribute that denotes |
| 58 | "do case sensitive comparisons". */ |
| 59 | |
| 60 | while (ke != NULL) |
| 61 | { |
| 62 | n = name; |
| 63 | p = ke->name; |
| 64 | |
| 65 | while (*p |
| 66 | && (*p == *n |
| 67 | || (isalpha ((unsigned char) *p) |
| 68 | && (tolower ((unsigned char) *p) |
| 69 | == tolower ((unsigned char) *n))))) |
| 70 | ++n, ++p; |
| 71 | |
| 72 | if (!*p && !*n) |
| 73 | return ke; |
| 74 | |
| 75 | ke = ke->next_name; |
| 76 | } |
| 77 | |
| 78 | if (kt->null_entry) |
| 79 | return kt->null_entry; |
| 80 | return NULL; |
| 81 | } |
| 82 | |
| 83 | /* Look up VALUE in the keyword table KT. |
| 84 | The result is the keyword entry or NULL if not found. */ |
| 85 | |
| 86 | const CGEN_KEYWORD_ENTRY * |
| 87 | cgen_keyword_lookup_value (kt, value) |
| 88 | CGEN_KEYWORD *kt; |
| 89 | int value; |
| 90 | { |
| 91 | const CGEN_KEYWORD_ENTRY *ke; |
| 92 | |
| 93 | if (kt->name_hash_table == NULL) |
| 94 | build_keyword_hash_tables (kt); |
| 95 | |
| 96 | ke = kt->value_hash_table[hash_keyword_value (kt, value)]; |
| 97 | |
| 98 | while (ke != NULL) |
| 99 | { |
| 100 | if (value == ke->value) |
| 101 | return ke; |
| 102 | ke = ke->next_value; |
| 103 | } |
| 104 | |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | /* Add an entry to a keyword table. */ |
| 109 | |
| 110 | void |
| 111 | cgen_keyword_add (kt, ke) |
| 112 | CGEN_KEYWORD *kt; |
| 113 | CGEN_KEYWORD_ENTRY *ke; |
| 114 | { |
| 115 | unsigned int hash; |
| 116 | |
| 117 | if (kt->name_hash_table == NULL) |
| 118 | build_keyword_hash_tables (kt); |
| 119 | |
| 120 | hash = hash_keyword_name (kt, ke->name, 0); |
| 121 | ke->next_name = kt->name_hash_table[hash]; |
| 122 | kt->name_hash_table[hash] = ke; |
| 123 | |
| 124 | hash = hash_keyword_value (kt, ke->value); |
| 125 | ke->next_value = kt->value_hash_table[hash]; |
| 126 | kt->value_hash_table[hash] = ke; |
| 127 | |
| 128 | if (ke->name[0] == 0) |
| 129 | kt->null_entry = ke; |
| 130 | } |
| 131 | |
| 132 | /* FIXME: Need function to return count of keywords. */ |
| 133 | |
| 134 | /* Initialize a keyword table search. |
| 135 | SPEC is a specification of what to search for. |
| 136 | A value of NULL means to find every keyword. |
| 137 | Currently NULL is the only acceptable value [further specification |
| 138 | deferred]. |
| 139 | The result is an opaque data item used to record the search status. |
| 140 | It is passed to each call to cgen_keyword_search_next. */ |
| 141 | |
| 142 | CGEN_KEYWORD_SEARCH |
| 143 | cgen_keyword_search_init (kt, spec) |
| 144 | CGEN_KEYWORD *kt; |
| 145 | const char *spec; |
| 146 | { |
| 147 | CGEN_KEYWORD_SEARCH search; |
| 148 | |
| 149 | /* FIXME: Need to specify format of PARAMS. */ |
| 150 | if (spec != NULL) |
| 151 | abort (); |
| 152 | |
| 153 | if (kt->name_hash_table == NULL) |
| 154 | build_keyword_hash_tables (kt); |
| 155 | |
| 156 | search.table = kt; |
| 157 | search.spec = spec; |
| 158 | search.current_hash = 0; |
| 159 | search.current_entry = NULL; |
| 160 | return search; |
| 161 | } |
| 162 | |
| 163 | /* Return the next keyword specified by SEARCH. |
| 164 | The result is the next entry or NULL if there are no more. */ |
| 165 | |
| 166 | const CGEN_KEYWORD_ENTRY * |
| 167 | cgen_keyword_search_next (search) |
| 168 | CGEN_KEYWORD_SEARCH *search; |
| 169 | { |
| 170 | /* Has search finished? */ |
| 171 | if (search->current_hash == search->table->hash_table_size) |
| 172 | return NULL; |
| 173 | |
| 174 | /* Search in progress? */ |
| 175 | if (search->current_entry != NULL |
| 176 | /* Anything left on this hash chain? */ |
| 177 | && search->current_entry->next_name != NULL) |
| 178 | { |
| 179 | search->current_entry = search->current_entry->next_name; |
| 180 | return search->current_entry; |
| 181 | } |
| 182 | |
| 183 | /* Move to next hash chain [unless we haven't started yet]. */ |
| 184 | if (search->current_entry != NULL) |
| 185 | ++search->current_hash; |
| 186 | |
| 187 | while (search->current_hash < search->table->hash_table_size) |
| 188 | { |
| 189 | search->current_entry = search->table->name_hash_table[search->current_hash]; |
| 190 | if (search->current_entry != NULL) |
| 191 | return search->current_entry; |
| 192 | ++search->current_hash; |
| 193 | } |
| 194 | |
| 195 | return NULL; |
| 196 | } |
| 197 | |
| 198 | /* Return first entry in hash chain for NAME. |
| 199 | If CASE_SENSITIVE_P is non-zero, return a case sensitive hash. */ |
| 200 | |
| 201 | static unsigned int |
| 202 | hash_keyword_name (kt, name, case_sensitive_p) |
| 203 | const CGEN_KEYWORD *kt; |
| 204 | const char *name; |
| 205 | int case_sensitive_p; |
| 206 | { |
| 207 | unsigned int hash; |
| 208 | |
| 209 | if (case_sensitive_p) |
| 210 | for (hash = 0; *name; ++name) |
| 211 | hash = (hash * 97) + (unsigned char) *name; |
| 212 | else |
| 213 | for (hash = 0; *name; ++name) |
| 214 | hash = (hash * 97) + (unsigned char) tolower (*name); |
| 215 | return hash % kt->hash_table_size; |
| 216 | } |
| 217 | |
| 218 | /* Return first entry in hash chain for VALUE. */ |
| 219 | |
| 220 | static unsigned int |
| 221 | hash_keyword_value (kt, value) |
| 222 | const CGEN_KEYWORD *kt; |
| 223 | unsigned int value; |
| 224 | { |
| 225 | return value % kt->hash_table_size; |
| 226 | } |
| 227 | |
| 228 | /* Build a keyword table's hash tables. |
| 229 | We probably needn't build the value hash table for the assembler when |
| 230 | we're using the disassembler, but we keep things simple. */ |
| 231 | |
| 232 | static void |
| 233 | build_keyword_hash_tables (kt) |
| 234 | CGEN_KEYWORD *kt; |
| 235 | { |
| 236 | int i; |
| 237 | /* Use the number of compiled in entries as an estimate for the |
| 238 | typical sized table [not too many added at runtime]. */ |
| 239 | unsigned int size = KEYWORD_HASH_SIZE (kt->num_init_entries); |
| 240 | |
| 241 | kt->hash_table_size = size; |
| 242 | kt->name_hash_table = (CGEN_KEYWORD_ENTRY **) |
| 243 | xmalloc (size * sizeof (CGEN_KEYWORD_ENTRY *)); |
| 244 | memset (kt->name_hash_table, 0, size * sizeof (CGEN_KEYWORD_ENTRY *)); |
| 245 | kt->value_hash_table = (CGEN_KEYWORD_ENTRY **) |
| 246 | xmalloc (size * sizeof (CGEN_KEYWORD_ENTRY *)); |
| 247 | memset (kt->value_hash_table, 0, size * sizeof (CGEN_KEYWORD_ENTRY *)); |
| 248 | |
| 249 | /* The table is scanned backwards as we want keywords appearing earlier to |
| 250 | be prefered over later ones. */ |
| 251 | for (i = kt->num_init_entries - 1; i >= 0; --i) |
| 252 | cgen_keyword_add (kt, &kt->init_entries[i]); |
| 253 | } |
| 254 | \f |
| 255 | /* Hardware support. */ |
| 256 | |
| 257 | /* Lookup a hardware element by its name. |
| 258 | Returns NULL if NAME is not supported by the currently selected |
| 259 | mach/isa. */ |
| 260 | |
| 261 | const CGEN_HW_ENTRY * |
| 262 | cgen_hw_lookup_by_name (cd, name) |
| 263 | CGEN_CPU_DESC cd; |
| 264 | const char *name; |
| 265 | { |
| 266 | int i; |
| 267 | const CGEN_HW_ENTRY **hw = cd->hw_table.entries; |
| 268 | |
| 269 | for (i = 0; i < cd->hw_table.num_entries; ++i) |
| 270 | if (hw[i] && strcmp (name, hw[i]->name) == 0) |
| 271 | return hw[i]; |
| 272 | |
| 273 | return NULL; |
| 274 | } |
| 275 | |
| 276 | /* Lookup a hardware element by its number. |
| 277 | Hardware elements are enumerated, however it may be possible to add some |
| 278 | at runtime, thus HWNUM is not an enum type but rather an int. |
| 279 | Returns NULL if HWNUM is not supported by the currently selected mach. */ |
| 280 | |
| 281 | const CGEN_HW_ENTRY * |
| 282 | cgen_hw_lookup_by_num (cd, hwnum) |
| 283 | CGEN_CPU_DESC cd; |
| 284 | int hwnum; |
| 285 | { |
| 286 | int i; |
| 287 | const CGEN_HW_ENTRY **hw = cd->hw_table.entries; |
| 288 | |
| 289 | /* ??? This can be speeded up. */ |
| 290 | for (i = 0; i < cd->hw_table.num_entries; ++i) |
| 291 | if (hw[i] && hwnum == hw[i]->type) |
| 292 | return hw[i]; |
| 293 | |
| 294 | return NULL; |
| 295 | } |
| 296 | \f |
| 297 | /* Operand support. */ |
| 298 | |
| 299 | /* Lookup an operand by its name. |
| 300 | Returns NULL if NAME is not supported by the currently selected |
| 301 | mach/isa. */ |
| 302 | |
| 303 | const CGEN_OPERAND * |
| 304 | cgen_operand_lookup_by_name (cd, name) |
| 305 | CGEN_CPU_DESC cd; |
| 306 | const char *name; |
| 307 | { |
| 308 | int i; |
| 309 | const CGEN_OPERAND **op = cd->operand_table.entries; |
| 310 | |
| 311 | for (i = 0; i < cd->operand_table.num_entries; ++i) |
| 312 | if (op[i] && strcmp (name, op[i]->name) == 0) |
| 313 | return op[i]; |
| 314 | |
| 315 | return NULL; |
| 316 | } |
| 317 | |
| 318 | /* Lookup an operand by its number. |
| 319 | Operands are enumerated, however it may be possible to add some |
| 320 | at runtime, thus OPNUM is not an enum type but rather an int. |
| 321 | Returns NULL if OPNUM is not supported by the currently selected |
| 322 | mach/isa. */ |
| 323 | |
| 324 | const CGEN_OPERAND * |
| 325 | cgen_operand_lookup_by_num (cd, opnum) |
| 326 | CGEN_CPU_DESC cd; |
| 327 | int opnum; |
| 328 | { |
| 329 | return cd->operand_table.entries[opnum]; |
| 330 | } |
| 331 | \f |
| 332 | /* Instruction support. */ |
| 333 | |
| 334 | /* Return number of instructions. This includes any added at runtime. */ |
| 335 | |
| 336 | int |
| 337 | cgen_insn_count (cd) |
| 338 | CGEN_CPU_DESC cd; |
| 339 | { |
| 340 | int count = cd->insn_table.num_init_entries; |
| 341 | CGEN_INSN_LIST *rt_insns = cd->insn_table.new_entries; |
| 342 | |
| 343 | for ( ; rt_insns != NULL; rt_insns = rt_insns->next) |
| 344 | ++count; |
| 345 | |
| 346 | return count; |
| 347 | } |
| 348 | |
| 349 | /* Return number of macro-instructions. |
| 350 | This includes any added at runtime. */ |
| 351 | |
| 352 | int |
| 353 | cgen_macro_insn_count (cd) |
| 354 | CGEN_CPU_DESC cd; |
| 355 | { |
| 356 | int count = cd->macro_insn_table.num_init_entries; |
| 357 | CGEN_INSN_LIST *rt_insns = cd->macro_insn_table.new_entries; |
| 358 | |
| 359 | for ( ; rt_insns != NULL; rt_insns = rt_insns->next) |
| 360 | ++count; |
| 361 | |
| 362 | return count; |
| 363 | } |
| 364 | |
| 365 | /* Cover function to read and properly byteswap an insn value. */ |
| 366 | |
| 367 | CGEN_INSN_INT |
| 368 | cgen_get_insn_value (cd, buf, length) |
| 369 | CGEN_CPU_DESC cd; |
| 370 | unsigned char *buf; |
| 371 | int length; |
| 372 | { |
| 373 | CGEN_INSN_INT value; |
| 374 | |
| 375 | switch (length) |
| 376 | { |
| 377 | case 8: |
| 378 | value = *buf; |
| 379 | break; |
| 380 | case 16: |
| 381 | if (cd->insn_endian == CGEN_ENDIAN_BIG) |
| 382 | value = bfd_getb16 (buf); |
| 383 | else |
| 384 | value = bfd_getl16 (buf); |
| 385 | break; |
| 386 | case 32: |
| 387 | if (cd->insn_endian == CGEN_ENDIAN_BIG) |
| 388 | value = bfd_getb32 (buf); |
| 389 | else |
| 390 | value = bfd_getl32 (buf); |
| 391 | break; |
| 392 | default: |
| 393 | abort (); |
| 394 | } |
| 395 | |
| 396 | return value; |
| 397 | } |
| 398 | |
| 399 | /* Cover function to store an insn value properly byteswapped. */ |
| 400 | |
| 401 | void |
| 402 | cgen_put_insn_value (cd, buf, length, value) |
| 403 | CGEN_CPU_DESC cd; |
| 404 | unsigned char *buf; |
| 405 | int length; |
| 406 | CGEN_INSN_INT value; |
| 407 | { |
| 408 | switch (length) |
| 409 | { |
| 410 | case 8: |
| 411 | buf[0] = value; |
| 412 | break; |
| 413 | case 16: |
| 414 | if (cd->insn_endian == CGEN_ENDIAN_BIG) |
| 415 | bfd_putb16 (value, buf); |
| 416 | else |
| 417 | bfd_putl16 (value, buf); |
| 418 | break; |
| 419 | case 32: |
| 420 | if (cd->insn_endian == CGEN_ENDIAN_BIG) |
| 421 | bfd_putb32 (value, buf); |
| 422 | else |
| 423 | bfd_putl32 (value, buf); |
| 424 | break; |
| 425 | default: |
| 426 | abort (); |
| 427 | } |
| 428 | } |
| 429 | \f |
| 430 | /* Look up instruction INSN_*_VALUE and extract its fields. |
| 431 | INSN_INT_VALUE is used if CGEN_INT_INSN_P. |
| 432 | Otherwise INSN_BYTES_VALUE is used. |
| 433 | INSN, if non-null, is the insn table entry. |
| 434 | Otherwise INSN_*_VALUE is examined to compute it. |
| 435 | LENGTH is the bit length of INSN_*_VALUE if known, otherwise 0. |
| 436 | 0 is only valid if `insn == NULL && ! CGEN_INT_INSN_P'. |
| 437 | If INSN != NULL, LENGTH must be valid. |
| 438 | ALIAS_P is non-zero if alias insns are to be included in the search. |
| 439 | |
| 440 | The result is a pointer to the insn table entry, or NULL if the instruction |
| 441 | wasn't recognized. */ |
| 442 | |
| 443 | /* ??? Will need to be revisited for VLIW architectures. */ |
| 444 | |
| 445 | const CGEN_INSN * |
| 446 | cgen_lookup_insn (cd, insn, insn_int_value, insn_bytes_value, length, fields, |
| 447 | alias_p) |
| 448 | CGEN_CPU_DESC cd; |
| 449 | const CGEN_INSN *insn; |
| 450 | CGEN_INSN_INT insn_int_value; |
| 451 | /* ??? CGEN_INSN_BYTES would be a nice type name to use here. */ |
| 452 | unsigned char *insn_bytes_value; |
| 453 | int length; |
| 454 | CGEN_FIELDS *fields; |
| 455 | int alias_p; |
| 456 | { |
| 457 | unsigned char *buf; |
| 458 | CGEN_INSN_INT base_insn; |
| 459 | CGEN_EXTRACT_INFO ex_info; |
| 460 | CGEN_EXTRACT_INFO *info; |
| 461 | |
| 462 | if (cd->int_insn_p) |
| 463 | { |
| 464 | info = NULL; |
| 465 | buf = (unsigned char *) alloca (cd->max_insn_bitsize / 8); |
| 466 | cgen_put_insn_value (cd, buf, length, insn_int_value); |
| 467 | base_insn = insn_int_value; |
| 468 | } |
| 469 | else |
| 470 | { |
| 471 | info = &ex_info; |
| 472 | ex_info.dis_info = NULL; |
| 473 | ex_info.insn_bytes = insn_bytes_value; |
| 474 | ex_info.valid = -1; |
| 475 | buf = insn_bytes_value; |
| 476 | base_insn = cgen_get_insn_value (cd, buf, length); |
| 477 | } |
| 478 | |
| 479 | if (!insn) |
| 480 | { |
| 481 | const CGEN_INSN_LIST *insn_list; |
| 482 | |
| 483 | /* The instructions are stored in hash lists. |
| 484 | Pick the first one and keep trying until we find the right one. */ |
| 485 | |
| 486 | insn_list = cgen_dis_lookup_insn (cd, buf, base_insn); |
| 487 | while (insn_list != NULL) |
| 488 | { |
| 489 | insn = insn_list->insn; |
| 490 | |
| 491 | if (alias_p |
| 492 | /* FIXME: Ensure ALIAS attribute always has same index. */ |
| 493 | || ! CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_ALIAS)) |
| 494 | { |
| 495 | /* Basic bit mask must be correct. */ |
| 496 | /* ??? May wish to allow target to defer this check until the |
| 497 | extract handler. */ |
| 498 | if ((base_insn & CGEN_INSN_BASE_MASK (insn)) |
| 499 | == CGEN_INSN_BASE_VALUE (insn)) |
| 500 | { |
| 501 | /* ??? 0 is passed for `pc' */ |
| 502 | int elength = CGEN_EXTRACT_FN (cd, insn) |
| 503 | (cd, insn, info, base_insn, fields, (bfd_vma) 0); |
| 504 | if (elength > 0) |
| 505 | { |
| 506 | /* sanity check */ |
| 507 | if (length != 0 && length != elength) |
| 508 | abort (); |
| 509 | return insn; |
| 510 | } |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | insn_list = insn_list->next; |
| 515 | } |
| 516 | } |
| 517 | else |
| 518 | { |
| 519 | /* Sanity check: can't pass an alias insn if ! alias_p. */ |
| 520 | if (! alias_p |
| 521 | && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_ALIAS)) |
| 522 | abort (); |
| 523 | /* Sanity check: length must be correct. */ |
| 524 | if (length != CGEN_INSN_BITSIZE (insn)) |
| 525 | abort (); |
| 526 | |
| 527 | /* ??? 0 is passed for `pc' */ |
| 528 | length = CGEN_EXTRACT_FN (cd, insn) |
| 529 | (cd, insn, info, base_insn, fields, (bfd_vma) 0); |
| 530 | /* Sanity check: must succeed. |
| 531 | Could relax this later if it ever proves useful. */ |
| 532 | if (length == 0) |
| 533 | abort (); |
| 534 | return insn; |
| 535 | } |
| 536 | |
| 537 | return NULL; |
| 538 | } |
| 539 | |
| 540 | /* Fill in the operand instances used by INSN whose operands are FIELDS. |
| 541 | INDICES is a pointer to a buffer of MAX_OPERAND_INSTANCES ints to be filled |
| 542 | in. */ |
| 543 | |
| 544 | void |
| 545 | cgen_get_insn_operands (cd, insn, fields, indices) |
| 546 | CGEN_CPU_DESC cd; |
| 547 | const CGEN_INSN *insn; |
| 548 | const CGEN_FIELDS *fields; |
| 549 | int *indices; |
| 550 | { |
| 551 | const CGEN_OPINST *opinst; |
| 552 | int i; |
| 553 | |
| 554 | if (insn->opinst == NULL) |
| 555 | abort (); |
| 556 | for (i = 0, opinst = insn->opinst; opinst->type != CGEN_OPINST_END; ++i, ++opinst) |
| 557 | { |
| 558 | enum cgen_operand_type op_type = opinst->op_type; |
| 559 | if (op_type == CGEN_OPERAND_NIL) |
| 560 | indices[i] = opinst->index; |
| 561 | else |
| 562 | indices[i] = (*cd->get_int_operand) (cd, op_type, fields); |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | /* Cover function to cgen_get_insn_operands when either INSN or FIELDS |
| 567 | isn't known. |
| 568 | The INSN, INSN_*_VALUE, and LENGTH arguments are passed to |
| 569 | cgen_lookup_insn unchanged. |
| 570 | INSN_INT_VALUE is used if CGEN_INT_INSN_P. |
| 571 | Otherwise INSN_BYTES_VALUE is used. |
| 572 | |
| 573 | The result is the insn table entry or NULL if the instruction wasn't |
| 574 | recognized. */ |
| 575 | |
| 576 | const CGEN_INSN * |
| 577 | cgen_lookup_get_insn_operands (cd, insn, insn_int_value, insn_bytes_value, |
| 578 | length, indices, fields) |
| 579 | CGEN_CPU_DESC cd; |
| 580 | const CGEN_INSN *insn; |
| 581 | CGEN_INSN_INT insn_int_value; |
| 582 | /* ??? CGEN_INSN_BYTES would be a nice type name to use here. */ |
| 583 | unsigned char *insn_bytes_value; |
| 584 | int length; |
| 585 | int *indices; |
| 586 | CGEN_FIELDS *fields; |
| 587 | { |
| 588 | /* Pass non-zero for ALIAS_P only if INSN != NULL. |
| 589 | If INSN == NULL, we want a real insn. */ |
| 590 | insn = cgen_lookup_insn (cd, insn, insn_int_value, insn_bytes_value, |
| 591 | length, fields, insn != NULL); |
| 592 | if (! insn) |
| 593 | return NULL; |
| 594 | |
| 595 | cgen_get_insn_operands (cd, insn, fields, indices); |
| 596 | return insn; |
| 597 | } |
| 598 | |
| 599 | /* Allow signed overflow of instruction fields. */ |
| 600 | void |
| 601 | cgen_set_signed_overflow_ok (cd) |
| 602 | CGEN_CPU_DESC cd; |
| 603 | { |
| 604 | cd->signed_overflow_ok_p = 1; |
| 605 | } |
| 606 | |
| 607 | /* Generate an error message if a signed field in an instruction overflows. */ |
| 608 | void |
| 609 | cgen_clear_signed_overflow_ok (cd) |
| 610 | CGEN_CPU_DESC cd; |
| 611 | { |
| 612 | cd->signed_overflow_ok_p = 0; |
| 613 | } |
| 614 | |
| 615 | /* Will an error message be generated if a signed field in an instruction overflows ? */ |
| 616 | unsigned int |
| 617 | cgen_signed_overflow_ok_p (cd) |
| 618 | CGEN_CPU_DESC cd; |
| 619 | { |
| 620 | return cd->signed_overflow_ok_p; |
| 621 | } |