1 /* The IGEN simulator generator for GDB, the GNU Debugger. 2 3 Copyright 2002-2020 Free Software Foundation, Inc. 4 5 Contributed by Andrew Cagney. 6 7 This file is part of GDB. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 21 22 23 #include "misc.h" 24 #include "lf.h" 25 #include "table.h" 26 #include "filter.h" 27 #include "igen.h" 28 29 #include "ld-insn.h" 30 #include "ld-decode.h" 31 32 #include "gen.h" 33 34 #include "gen-idecode.h" 35 #include "gen-icache.h" 36 #include "gen-semantics.h" 37 38 39 40 static void 41 lf_print_opcodes (lf *file, gen_entry *table) 42 { 43 if (table !=NULL) 44 { 45 while (1) 46 { 47 ASSERT (table->opcode != NULL); 48 lf_printf (file, "_%d_%d", 49 table->opcode->first, table->opcode->last); 50 if (table->parent == NULL) 51 break; 52 lf_printf (file, "__%d", table->opcode_nr); 53 table = table->parent; 54 } 55 } 56 } 57 58 59 60 61 static void 62 print_idecode_ifetch (lf *file, 63 int previous_nr_prefetched_words, 64 int current_nr_prefetched_words) 65 { 66 int word_nr; 67 for (word_nr = previous_nr_prefetched_words; 68 word_nr < current_nr_prefetched_words; word_nr++) 69 { 70 lf_printf (file, 71 "instruction_word instruction_%d = IMEM%d_IMMED (cia, %d);\n", 72 word_nr, options.insn_bit_size, word_nr); 73 74 } 75 } 76 77 78 79 /****************************************************************/ 80 81 82 static void 83 lf_print_table_name (lf *file, gen_entry *table) 84 { 85 lf_printf (file, "idecode_table"); 86 lf_print_opcodes (file, table); 87 } 88 89 90 91 static void 92 print_idecode_table (lf *file, gen_entry *entry, const char *result) 93 { 94 lf_printf (file, "/* prime the search */\n"); 95 lf_printf (file, "idecode_table_entry *table = "); 96 lf_print_table_name (file, entry); 97 lf_printf (file, ";\n"); 98 lf_printf (file, "int opcode = EXTRACTED%d (instruction, %d, %d);\n", 99 options.insn_bit_size, 100 i2target (options.hi_bit_nr, entry->opcode->first), 101 i2target (options.hi_bit_nr, entry->opcode->last)); 102 lf_printf (file, "idecode_table_entry *table_entry = table + opcode;\n"); 103 104 lf_printf (file, "\n"); 105 lf_printf (file, "/* iterate until a leaf */\n"); 106 lf_printf (file, "while (1) {\n"); 107 lf_printf (file, " signed shift = table_entry->shift;\n"); 108 lf_printf (file, "if (shift == function_entry) break;\n"); 109 lf_printf (file, " if (shift >= 0) {\n"); 110 lf_printf (file, " table = ((idecode_table_entry*)\n"); 111 lf_printf (file, " table_entry->function_or_table);\n"); 112 lf_printf (file, " opcode = ((instruction & table_entry->mask)\n"); 113 lf_printf (file, " >> shift);\n"); 114 lf_printf (file, " table_entry = table + opcode;\n"); 115 lf_printf (file, " }\n"); 116 lf_printf (file, " else {\n"); 117 lf_printf (file, " /* must be a boolean */\n"); 118 lf_printf (file, " ASSERT(table_entry->shift == boolean_entry);\n"); 119 lf_printf (file, " opcode = ((instruction & table_entry->mask)\n"); 120 lf_printf (file, " != table_entry->value);\n"); 121 lf_printf (file, " table = ((idecode_table_entry*)\n"); 122 lf_printf (file, " table_entry->function_or_table);\n"); 123 lf_printf (file, " table_entry = table + opcode;\n"); 124 lf_printf (file, " }\n"); 125 lf_printf (file, "}\n"); 126 127 lf_printf (file, "\n"); 128 lf_printf (file, "/* call the leaf code */\n"); 129 if (options.gen.code == generate_jumps) 130 { 131 lf_printf (file, "goto *table_entry->function_or_table;\n"); 132 } 133 else 134 { 135 lf_printf (file, "%s ", result); 136 if (options.gen.icache) 137 { 138 lf_printf (file, 139 "(((idecode_icache*)table_entry->function_or_table)\n"); 140 lf_printf (file, " ("); 141 print_icache_function_actual (file, 1); 142 lf_printf (file, "));\n"); 143 } 144 else 145 { 146 lf_printf (file, 147 "((idecode_semantic*)table_entry->function_or_table)\n"); 148 lf_printf (file, " ("); 149 print_semantic_function_actual (file, 1); 150 lf_printf (file, ");\n"); 151 } 152 } 153 } 154 155 156 static void 157 print_idecode_table_start (lf *file, gen_entry *table, int depth, void *data) 158 { 159 ASSERT (depth == 0); 160 /* start of the table */ 161 if (table->opcode_rule->gen == array_gen) 162 { 163 lf_printf (file, "\n"); 164 lf_printf (file, "static idecode_table_entry "); 165 lf_print_table_name (file, table); 166 lf_printf (file, "[] = {\n"); 167 } 168 } 169 170 static void 171 print_idecode_table_leaf (lf *file, gen_entry *entry, int depth, void *data) 172 { 173 gen_entry *master_entry; 174 ASSERT (entry->parent != NULL); 175 ASSERT (depth == 0); 176 if (entry->combined_parent == NULL) 177 master_entry = entry; 178 else 179 master_entry = entry->combined_parent; 180 181 /* add an entry to the table */ 182 if (entry->parent->opcode_rule->gen == array_gen) 183 { 184 lf_printf (file, " /*%d*/ { ", entry->opcode_nr); 185 if (entry->opcode == NULL) 186 { 187 ASSERT (entry->nr_insns == 1); 188 /* table leaf entry */ 189 lf_printf (file, "function_entry, 0, 0, "); 190 if (options.gen.code == generate_jumps) 191 { 192 lf_printf (file, "&&"); 193 } 194 print_function_name (file, 195 entry->insns->insn->name, 196 entry->insns->insn->format_name, 197 NULL, 198 master_entry->expanded_bits, 199 (options.gen.icache 200 ? function_name_prefix_icache 201 : function_name_prefix_semantics)); 202 } 203 else if (entry->opcode_rule->gen == switch_gen 204 || entry->opcode_rule->gen == goto_switch_gen 205 || entry->opcode_rule->gen == padded_switch_gen) 206 { 207 /* table calling switch statement */ 208 lf_printf (file, "function_entry, 0, 0, "); 209 if (options.gen.code == generate_jumps) 210 { 211 lf_printf (file, "&&"); 212 } 213 lf_print_table_name (file, entry); 214 } 215 else if (entry->opcode->is_boolean) 216 { 217 /* table `calling' boolean table */ 218 lf_printf (file, "boolean_entry, "); 219 lf_printf (file, "MASK32(%d, %d), ", 220 i2target (options.hi_bit_nr, entry->opcode->first), 221 i2target (options.hi_bit_nr, entry->opcode->last)); 222 lf_printf (file, "INSERTED32(%d, %d, %d), ", 223 entry->opcode->boolean_constant, 224 i2target (options.hi_bit_nr, entry->opcode->first), 225 i2target (options.hi_bit_nr, entry->opcode->last)); 226 lf_print_table_name (file, entry); 227 } 228 else 229 { 230 /* table `calling' another table */ 231 lf_printf (file, "%d, ", 232 options.insn_bit_size - entry->opcode->last - 1); 233 lf_printf (file, "MASK%d(%d,%d), ", options.insn_bit_size, 234 i2target (options.hi_bit_nr, entry->opcode->first), 235 i2target (options.hi_bit_nr, entry->opcode->last)); 236 lf_printf (file, "0, "); 237 lf_print_table_name (file, entry); 238 } 239 lf_printf (file, " },\n"); 240 } 241 } 242 243 static void 244 print_idecode_table_end (lf *file, gen_entry *table, int depth, void *data) 245 { 246 ASSERT (depth == 0); 247 if (table->opcode_rule->gen == array_gen) 248 { 249 lf_printf (file, "};\n"); 250 } 251 } 252 253 /****************************************************************/ 254 255 256 static void 257 print_goto_switch_name (lf *file, gen_entry *entry) 258 { 259 lf_printf (file, "case_"); 260 if (entry->opcode == NULL) 261 { 262 print_function_name (file, 263 entry->insns->insn->name, 264 entry->insns->insn->format_name, 265 NULL, 266 entry->expanded_bits, 267 (options.gen.icache 268 ? function_name_prefix_icache 269 : function_name_prefix_semantics)); 270 } 271 else 272 { 273 lf_print_table_name (file, entry); 274 } 275 } 276 277 static void 278 print_goto_switch_table_leaf (lf *file, 279 gen_entry *entry, int depth, void *data) 280 { 281 ASSERT (entry->parent != NULL); 282 ASSERT (depth == 0); 283 ASSERT (entry->parent->opcode_rule->gen == goto_switch_gen); 284 ASSERT (entry->parent->opcode); 285 286 lf_printf (file, "/* %d */ &&", entry->opcode_nr); 287 if (entry->combined_parent != NULL) 288 print_goto_switch_name (file, entry->combined_parent); 289 else 290 print_goto_switch_name (file, entry); 291 lf_printf (file, ",\n"); 292 } 293 294 static void 295 print_goto_switch_break (lf *file, gen_entry *entry) 296 { 297 lf_printf (file, "goto break_"); 298 lf_print_table_name (file, entry->parent); 299 lf_printf (file, ";\n"); 300 } 301 302 303 static void 304 print_goto_switch_table (lf *file, gen_entry *table) 305 { 306 lf_printf (file, "const static void *"); 307 lf_print_table_name (file, table); 308 lf_printf (file, "[] = {\n"); 309 lf_indent (file, +2); 310 gen_entry_traverse_tree (file, table, 0, NULL /*start */ , 311 print_goto_switch_table_leaf, NULL /*end */ , 312 NULL /*data */ ); 313 lf_indent (file, -2); 314 lf_printf (file, "};\n"); 315 } 316 317 318 void print_idecode_switch (lf *file, gen_entry *table, const char *result); 319 320 static void 321 print_idecode_switch_start (lf *file, gen_entry *table, int depth, void *data) 322 { 323 /* const char *result = data; */ 324 ASSERT (depth == 0); 325 ASSERT (table->opcode_rule->gen == switch_gen 326 || table->opcode_rule->gen == goto_switch_gen 327 || table->opcode_rule->gen == padded_switch_gen); 328 329 if (table->opcode->is_boolean 330 || table->opcode_rule->gen == switch_gen 331 || table->opcode_rule->gen == padded_switch_gen) 332 { 333 lf_printf (file, "switch (EXTRACTED%d (instruction_%d, %d, %d))\n", 334 options.insn_bit_size, 335 table->opcode_rule->word_nr, 336 i2target (options.hi_bit_nr, table->opcode->first), 337 i2target (options.hi_bit_nr, table->opcode->last)); 338 lf_indent (file, +2); 339 lf_printf (file, "{\n"); 340 } 341 else if (table->opcode_rule->gen == goto_switch_gen) 342 { 343 if (table->parent != NULL 344 && (table->parent->opcode_rule->gen == switch_gen 345 || table->parent->opcode_rule->gen == goto_switch_gen 346 || table->parent->opcode_rule->gen == padded_switch_gen)) 347 { 348 lf_printf (file, "{\n"); 349 lf_indent (file, +2); 350 } 351 print_goto_switch_table (file, table); 352 lf_printf (file, "ASSERT (EXTRACTED%d (instruction_%d, %d, %d)\n", 353 options.insn_bit_size, 354 table->opcode->word_nr, 355 i2target (options.hi_bit_nr, table->opcode->first), 356 i2target (options.hi_bit_nr, table->opcode->last)); 357 lf_printf (file, " < (sizeof ("); 358 lf_print_table_name (file, table); 359 lf_printf (file, ") / sizeof(void*)));\n"); 360 lf_printf (file, "goto *"); 361 lf_print_table_name (file, table); 362 lf_printf (file, "[EXTRACTED%d (instruction_%d, %d, %d)];\n", 363 options.insn_bit_size, 364 table->opcode->word_nr, 365 i2target (options.hi_bit_nr, table->opcode->first), 366 i2target (options.hi_bit_nr, table->opcode->last)); 367 } 368 else 369 { 370 ASSERT ("bad switch" == NULL); 371 } 372 } 373 374 375 static void 376 print_idecode_switch_leaf (lf *file, gen_entry *entry, int depth, void *data) 377 { 378 const char *result = data; 379 ASSERT (entry->parent != NULL); 380 ASSERT (depth == 0); 381 ASSERT (entry->parent->opcode_rule->gen == switch_gen 382 || entry->parent->opcode_rule->gen == goto_switch_gen 383 || entry->parent->opcode_rule->gen == padded_switch_gen); 384 ASSERT (entry->parent->opcode); 385 386 /* skip over any instructions combined into another entry */ 387 if (entry->combined_parent != NULL) 388 return; 389 390 if (entry->parent->opcode->is_boolean && entry->opcode_nr == 0) 391 { 392 /* case: boolean false target */ 393 lf_printf (file, "case %d:\n", entry->parent->opcode->boolean_constant); 394 } 395 else if (entry->parent->opcode->is_boolean && entry->opcode_nr != 0) 396 { 397 /* case: boolean true case */ 398 lf_printf (file, "default:\n"); 399 } 400 else if (entry->parent->opcode_rule->gen == switch_gen 401 || entry->parent->opcode_rule->gen == padded_switch_gen) 402 { 403 /* case: <opcode-nr> - switch */ 404 gen_entry *cob; 405 for (cob = entry; cob != NULL; cob = cob->combined_next) 406 lf_printf (file, "case %d:\n", cob->opcode_nr); 407 } 408 else if (entry->parent->opcode_rule->gen == goto_switch_gen) 409 { 410 /* case: <opcode-nr> - goto-switch */ 411 print_goto_switch_name (file, entry); 412 lf_printf (file, ":\n"); 413 } 414 else 415 { 416 ERROR ("bad switch"); 417 } 418 lf_printf (file, " {\n"); 419 lf_indent (file, +4); 420 { 421 if (entry->opcode == NULL) 422 { 423 /* switch calling leaf */ 424 ASSERT (entry->nr_insns == 1); 425 print_idecode_ifetch (file, entry->nr_prefetched_words, 426 entry->insns->semantic->nr_prefetched_words); 427 switch (options.gen.code) 428 { 429 case generate_jumps: 430 lf_printf (file, "goto "); 431 break; 432 case generate_calls: 433 lf_printf (file, "%s", result); 434 break; 435 } 436 print_function_name (file, 437 entry->insns->insn->name, 438 entry->insns->insn->format_name, 439 NULL, 440 entry->expanded_bits, 441 (options.gen.icache 442 ? function_name_prefix_icache 443 : function_name_prefix_semantics)); 444 if (options.gen.code == generate_calls) 445 { 446 lf_printf (file, " ("); 447 print_semantic_function_actual (file, 448 entry->insns->semantic-> 449 nr_prefetched_words); 450 lf_printf (file, ")"); 451 } 452 lf_printf (file, ";\n"); 453 } 454 else if (entry->opcode_rule->gen == switch_gen 455 || entry->opcode_rule->gen == goto_switch_gen 456 || entry->opcode_rule->gen == padded_switch_gen) 457 { 458 /* switch calling switch */ 459 lf_printf (file, "{\n"); 460 lf_indent (file, +2); 461 print_idecode_ifetch (file, entry->parent->nr_prefetched_words, 462 entry->nr_prefetched_words); 463 print_idecode_switch (file, entry, result); 464 lf_indent (file, -2); 465 lf_printf (file, "}\n"); 466 } 467 else 468 { 469 /* switch looking up a table */ 470 lf_printf (file, "{\n"); 471 lf_indent (file, +2); 472 print_idecode_ifetch (file, entry->parent->nr_prefetched_words, 473 entry->nr_prefetched_words); 474 print_idecode_table (file, entry, result); 475 lf_indent (file, -2); 476 lf_printf (file, "}\n"); 477 } 478 if (entry->parent->opcode->is_boolean 479 || entry->parent->opcode_rule->gen == switch_gen 480 || entry->parent->opcode_rule->gen == padded_switch_gen) 481 { 482 lf_printf (file, "break;\n"); 483 } 484 else if (entry->parent->opcode_rule->gen == goto_switch_gen) 485 { 486 print_goto_switch_break (file, entry); 487 } 488 else 489 { 490 ERROR ("bad switch"); 491 } 492 } 493 lf_indent (file, -4); 494 lf_printf (file, " }\n"); 495 } 496 497 498 static void 499 print_idecode_switch_illegal (lf *file, const char *result) 500 { 501 lf_indent (file, +2); 502 print_idecode_invalid (file, result, invalid_illegal); 503 lf_printf (file, "break;\n"); 504 lf_indent (file, -2); 505 } 506 507 static void 508 print_idecode_switch_end (lf *file, gen_entry *table, int depth, void *data) 509 { 510 const char *result = data; 511 ASSERT (depth == 0); 512 ASSERT (table->opcode_rule->gen == switch_gen 513 || table->opcode_rule->gen == goto_switch_gen 514 || table->opcode_rule->gen == padded_switch_gen); 515 ASSERT (table->opcode); 516 517 if (table->opcode->is_boolean) 518 { 519 lf_printf (file, "}\n"); 520 lf_indent (file, -2); 521 } 522 else if (table->opcode_rule->gen == switch_gen 523 || table->opcode_rule->gen == padded_switch_gen) 524 { 525 lf_printf (file, "default:\n"); 526 lf_indent (file, +2); 527 if (table->nr_entries == table->opcode->nr_opcodes) 528 { 529 print_sim_engine_abort (file, 530 "Internal error - bad switch generated"); 531 lf_printf (file, "%sNULL_CIA;\n", result); 532 lf_printf (file, "break;\n"); 533 } 534 else 535 { 536 print_idecode_switch_illegal (file, result); 537 } 538 lf_indent (file, -2); 539 lf_printf (file, "}\n"); 540 lf_indent (file, -2); 541 } 542 else if (table->opcode_rule->gen == goto_switch_gen) 543 { 544 lf_printf (file, "illegal_"); 545 lf_print_table_name (file, table); 546 lf_printf (file, ":\n"); 547 print_idecode_invalid (file, result, invalid_illegal); 548 lf_printf (file, "break_"); 549 lf_print_table_name (file, table); 550 lf_printf (file, ":;\n"); 551 if (table->parent != NULL 552 && (table->parent->opcode_rule->gen == switch_gen 553 || table->parent->opcode_rule->gen == goto_switch_gen 554 || table->parent->opcode_rule->gen == padded_switch_gen)) 555 { 556 lf_indent (file, -2); 557 lf_printf (file, "}\n"); 558 } 559 } 560 else 561 { 562 ERROR ("bad switch"); 563 } 564 } 565 566 567 void 568 print_idecode_switch (lf *file, gen_entry *table, const char *result) 569 { 570 gen_entry_traverse_tree (file, table, 571 0, 572 print_idecode_switch_start, 573 print_idecode_switch_leaf, 574 print_idecode_switch_end, (void *) result); 575 } 576 577 578 static void 579 print_idecode_switch_function_header (lf *file, 580 gen_entry *table, 581 int is_function_definition, 582 int nr_prefetched_words) 583 { 584 lf_printf (file, "\n"); 585 if (options.gen.code == generate_calls) 586 { 587 lf_printf (file, "static "); 588 if (options.gen.icache) 589 { 590 lf_printf (file, "idecode_semantic *"); 591 } 592 else 593 { 594 lf_printf (file, "unsigned_word"); 595 } 596 if (is_function_definition) 597 { 598 lf_printf (file, "\n"); 599 } 600 else 601 { 602 lf_printf (file, " "); 603 } 604 lf_print_table_name (file, table); 605 lf_printf (file, "\n("); 606 print_icache_function_formal (file, nr_prefetched_words); 607 lf_printf (file, ")"); 608 if (!is_function_definition) 609 { 610 lf_printf (file, ";"); 611 } 612 lf_printf (file, "\n"); 613 } 614 if (options.gen.code == generate_jumps && is_function_definition) 615 { 616 lf_indent (file, -1); 617 lf_print_table_name (file, table); 618 lf_printf (file, ":\n"); 619 lf_indent (file, +1); 620 } 621 } 622 623 624 static void 625 idecode_declare_if_switch (lf *file, gen_entry *table, int depth, void *data) 626 { 627 if ((table->opcode_rule->gen == switch_gen || table->opcode_rule->gen == goto_switch_gen || table->opcode_rule->gen == padded_switch_gen) &&table->parent != NULL /* don't declare the top one yet */ 628 && table->parent->opcode_rule->gen == array_gen) 629 { 630 print_idecode_switch_function_header (file, 631 table, 632 0 /*isnt function definition */ , 633 0); 634 } 635 } 636 637 638 static void 639 idecode_expand_if_switch (lf *file, gen_entry *table, int depth, void *data) 640 { 641 if ((table->opcode_rule->gen == switch_gen || table->opcode_rule->gen == goto_switch_gen || table->opcode_rule->gen == padded_switch_gen) &&table->parent != NULL /* don't expand the top one yet */ 642 && table->parent->opcode_rule->gen == array_gen) 643 { 644 print_idecode_switch_function_header (file, 645 table, 646 1 /*is function definition */ , 647 0); 648 if (options.gen.code == generate_calls) 649 { 650 lf_printf (file, "{\n"); 651 lf_indent (file, +2); 652 } 653 print_idecode_switch (file, table, "return"); 654 if (options.gen.code == generate_calls) 655 { 656 lf_indent (file, -2); 657 lf_printf (file, "}\n"); 658 } 659 } 660 } 661 662 663 /****************************************************************/ 664 665 666 void 667 print_idecode_lookups (lf *file, gen_entry *table, cache_entry *cache_rules) 668 { 669 int depth; 670 671 /* output switch function declarations where needed by tables */ 672 gen_entry_traverse_tree (file, table, 1, idecode_declare_if_switch, /* START */ 673 NULL, NULL, NULL); 674 675 /* output tables where needed */ 676 for (depth = gen_entry_depth (table); depth > 0; depth--) 677 { 678 gen_entry_traverse_tree (file, table, 679 1 - depth, 680 print_idecode_table_start, 681 print_idecode_table_leaf, 682 print_idecode_table_end, NULL); 683 } 684 685 /* output switch functions where needed */ 686 gen_entry_traverse_tree (file, table, 1, idecode_expand_if_switch, /* START */ 687 NULL, NULL, NULL); 688 } 689 690 691 void 692 print_idecode_body (lf *file, gen_entry *table, const char *result) 693 { 694 if (table->opcode_rule->gen == switch_gen 695 || table->opcode_rule->gen == goto_switch_gen 696 || table->opcode_rule->gen == padded_switch_gen) 697 { 698 print_idecode_switch (file, table, result); 699 } 700 else 701 { 702 print_idecode_table (file, table, result); 703 } 704 } 705 706 707 /****************************************************************/ 708 709 /* Output code to do any final checks on the decoded instruction. 710 This includes things like verifying any on decoded fields have the 711 correct value and checking that (for floating point) floating point 712 hardware isn't disabled */ 713 714 void 715 print_idecode_validate (lf *file, 716 insn_entry * instruction, insn_opcodes *opcode_paths) 717 { 718 /* Validate: unchecked instruction fields 719 720 If any constant fields in the instruction were not checked by the 721 idecode tables, output code to check that they have the correct 722 value here */ 723 { 724 int nr_checks = 0; 725 int word_nr; 726 lf_printf (file, "\n"); 727 lf_indent_suppress (file); 728 lf_printf (file, "#if defined (WITH_RESERVED_BITS)\n"); 729 lf_printf (file, "/* validate: "); 730 print_insn_words (file, instruction); 731 lf_printf (file, " */\n"); 732 for (word_nr = 0; word_nr < instruction->nr_words; word_nr++) 733 { 734 insn_uint check_mask = 0; 735 insn_uint check_val = 0; 736 insn_word_entry *word = instruction->word[word_nr]; 737 int bit_nr; 738 739 /* form check_mask/check_val containing what needs to be checked 740 in the instruction */ 741 for (bit_nr = 0; bit_nr < options.insn_bit_size; bit_nr++) 742 { 743 insn_bit_entry *bit = word->bit[bit_nr]; 744 insn_field_entry *field = bit->field; 745 746 /* Make space for the next bit */ 747 check_mask <<= 1; 748 check_val <<= 1; 749 750 /* Only need to validate constant (and reserved) 751 bits. Skip any others */ 752 if (field->type != insn_field_int 753 && field->type != insn_field_reserved 754 /* Consider a named field equal to a value to be just as 755 constant as an integer field. */ 756 && (field->type != insn_field_string 757 || field->conditions == NULL 758 || field->conditions->test != insn_field_cond_eq 759 || field->conditions->type != insn_field_cond_value)) 760 continue; 761 762 /* Look through the list of opcode paths that lead to this 763 instruction. See if any have failed to check the 764 relevant bit */ 765 if (opcode_paths != NULL) 766 { 767 insn_opcodes *entry; 768 for (entry = opcode_paths; entry != NULL; entry = entry->next) 769 { 770 opcode_field *opcode; 771 for (opcode = entry->opcode; 772 opcode != NULL; opcode = opcode->parent) 773 { 774 if (opcode->word_nr == word_nr 775 && opcode->first <= bit_nr 776 && opcode->last >= bit_nr) 777 /* we've decoded on this bit */ 778 break; 779 } 780 if (opcode == NULL) 781 /* the bit wasn't decoded on */ 782 break; 783 } 784 if (entry == NULL) 785 /* all the opcode paths decoded on BIT_NR, no need 786 to check it */ 787 continue; 788 } 789 790 check_mask |= 1; 791 check_val |= bit->value; 792 } 793 794 /* if any bits not checked by opcode tables, output code to check them */ 795 if (check_mask) 796 { 797 if (nr_checks == 0) 798 { 799 lf_printf (file, "if (WITH_RESERVED_BITS)\n"); 800 lf_printf (file, " {\n"); 801 lf_indent (file, +4); 802 } 803 nr_checks++; 804 if (options.insn_bit_size > 32) 805 { 806 lf_printf (file, "if ((instruction_%d\n", word_nr); 807 lf_printf (file, " & UNSIGNED64 (0x%08lx%08lx))\n", 808 (unsigned long) (check_mask >> 32), 809 (unsigned long) (check_mask)); 810 lf_printf (file, " != UNSIGNED64 (0x%08lx%08lx))\n", 811 (unsigned long) (check_val >> 32), 812 (unsigned long) (check_val)); 813 } 814 else 815 { 816 lf_printf (file, 817 "if ((instruction_%d & 0x%08lx) != 0x%08lx)\n", 818 word_nr, (unsigned long) (check_mask), 819 (unsigned long) (check_val)); 820 } 821 lf_indent (file, +2); 822 print_idecode_invalid (file, "return", invalid_illegal); 823 lf_indent (file, -2); 824 } 825 } 826 if (nr_checks > 0) 827 { 828 lf_indent (file, -4); 829 lf_printf (file, " }\n"); 830 } 831 lf_indent_suppress (file); 832 lf_printf (file, "#endif\n"); 833 } 834 835 /* Validate: Floating Point hardware 836 837 If the simulator is being built with out floating point hardware 838 (different to it being disabled in the MSR) then floating point 839 instructions are invalid */ 840 { 841 if (filter_is_member (instruction->flags, "f")) 842 { 843 lf_printf (file, "\n"); 844 lf_indent_suppress (file); 845 lf_printf (file, "#if defined(CURRENT_FLOATING_POINT)\n"); 846 lf_printf (file, "/* Validate: FP hardware exists */\n"); 847 lf_printf (file, 848 "if (CURRENT_FLOATING_POINT != HARD_FLOATING_POINT) {\n"); 849 lf_indent (file, +2); 850 print_idecode_invalid (file, "return", invalid_illegal); 851 lf_indent (file, -2); 852 lf_printf (file, "}\n"); 853 lf_indent_suppress (file); 854 lf_printf (file, "#endif\n"); 855 } 856 } 857 858 /* Validate: Floating Point available 859 860 If floating point is not available, we enter a floating point 861 unavailable interrupt into the cache instead of the instruction 862 proper. 863 864 The PowerPC spec requires a CSI after MSR[FP] is changed and when 865 ever a CSI occures we flush the instruction cache. */ 866 867 { 868 if (filter_is_member (instruction->flags, "f")) 869 { 870 lf_printf (file, "\n"); 871 lf_indent_suppress (file); 872 lf_printf (file, "#if defined(IS_FP_AVAILABLE)\n"); 873 lf_printf (file, "/* Validate: FP available according to cpu */\n"); 874 lf_printf (file, "if (!IS_FP_AVAILABLE) {\n"); 875 lf_indent (file, +2); 876 print_idecode_invalid (file, "return", invalid_fp_unavailable); 877 lf_indent (file, -2); 878 lf_printf (file, "}\n"); 879 lf_indent_suppress (file); 880 lf_printf (file, "#endif\n"); 881 } 882 } 883 884 /* Validate: Validate Instruction in correct slot 885 886 Some architectures place restrictions on the slot that an 887 instruction can be issued in */ 888 889 { 890 if (filter_is_member (instruction->options, "s") 891 || options.gen.slot_verification) 892 { 893 lf_printf (file, "\n"); 894 lf_indent_suppress (file); 895 lf_printf (file, "#if defined(IS_WRONG_SLOT)\n"); 896 lf_printf (file, 897 "/* Validate: Instruction issued in correct slot */\n"); 898 lf_printf (file, "if (IS_WRONG_SLOT) {\n"); 899 lf_indent (file, +2); 900 print_idecode_invalid (file, "return", invalid_wrong_slot); 901 lf_indent (file, -2); 902 lf_printf (file, "}\n"); 903 lf_indent_suppress (file); 904 lf_printf (file, "#endif\n"); 905 } 906 } 907 908 } 909 910 911 /****************************************************************/ 912 913 914 void 915 print_idecode_issue_function_header (lf *file, 916 const char *processor, 917 function_decl_type decl_type, 918 int nr_prefetched_words) 919 { 920 int indent; 921 lf_printf (file, "\n"); 922 switch (decl_type) 923 { 924 case is_function_declaration: 925 lf_print__function_type_function (file, print_semantic_function_type, 926 "INLINE_IDECODE", " "); 927 break; 928 case is_function_definition: 929 lf_print__function_type_function (file, print_semantic_function_type, 930 "INLINE_IDECODE", "\n"); 931 break; 932 case is_function_variable: 933 if (lf_get_file_type (file) == lf_is_h) 934 lf_printf (file, "extern "); 935 print_semantic_function_type (file); 936 lf_printf (file, " (*"); 937 break; 938 } 939 indent = print_function_name (file, 940 "issue", 941 NULL, 942 processor, 943 NULL, function_name_prefix_idecode); 944 switch (decl_type) 945 { 946 case is_function_definition: 947 indent += lf_printf (file, " ("); 948 break; 949 case is_function_declaration: 950 lf_putstr (file, "\n("); 951 indent = 1; 952 break; 953 case is_function_variable: 954 lf_putstr (file, ")\n("); 955 indent = 1; 956 break; 957 } 958 lf_indent (file, +indent); 959 print_semantic_function_formal (file, nr_prefetched_words); 960 lf_putstr (file, ")"); 961 lf_indent (file, -indent); 962 switch (decl_type) 963 { 964 case is_function_definition: 965 lf_printf (file, "\n"); 966 break; 967 case is_function_declaration: 968 case is_function_variable: 969 lf_putstr (file, ";\n"); 970 break; 971 } 972 } 973 974 975 976 void 977 print_idecode_globals (lf *file) 978 { 979 lf_printf (file, "enum {\n"); 980 lf_printf (file, " /* greater or equal to zero => table */\n"); 981 lf_printf (file, " function_entry = -1,\n"); 982 lf_printf (file, " boolean_entry = -2,\n"); 983 lf_printf (file, "};\n"); 984 lf_printf (file, "\n"); 985 lf_printf (file, "typedef struct _idecode_table_entry {\n"); 986 lf_printf (file, " int shift;\n"); 987 lf_printf (file, " unsigned%d mask;\n", options.insn_bit_size); 988 lf_printf (file, " unsigned%d value;\n", options.insn_bit_size); 989 lf_printf (file, " void *function_or_table;\n"); 990 lf_printf (file, "} idecode_table_entry;\n"); 991 } 992