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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: psloop - Main AML parse loop * * Copyright (C) 2000 - 2018, Intel Corp. * *****************************************************************************/ /* * Parse the AML and build an operation tree as most interpreters, (such as * Perl) do. Parsing is done by hand rather than with a YACC generated parser * to tightly constrain stack and dynamic memory usage. Parsing is kept * flexible and the code fairly compact by parsing based on a list of AML * opcode templates in aml_op_info[]. */ #include <acpi/acpi.h> #include "accommon.h" #include "acinterp.h" #include "acparser.h" #include "acdispat.h" #include "amlcode.h" #include "acconvert.h" #include "acnamesp.h" #define _COMPONENT ACPI_PARSER ACPI_MODULE_NAME("psloop") /* Local prototypes */ static acpi_status acpi_ps_get_arguments(struct acpi_walk_state *walk_state, u8 * aml_op_start, union acpi_parse_object *op); static void acpi_ps_link_module_code(union acpi_parse_object *parent_op, u8 *aml_start, u32 aml_length, acpi_owner_id owner_id); /******************************************************************************* * * FUNCTION: acpi_ps_get_arguments * * PARAMETERS: walk_state - Current state * aml_op_start - Op start in AML * op - Current Op * * RETURN: Status * * DESCRIPTION: Get arguments for passed Op. * ******************************************************************************/ static acpi_status acpi_ps_get_arguments(struct acpi_walk_state *walk_state, u8 * aml_op_start, union acpi_parse_object *op) { acpi_status status = AE_OK; union acpi_parse_object *arg = NULL; const struct acpi_opcode_info *op_info; ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state); ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Get arguments for opcode [%s]\n", op->common.aml_op_name)); switch (op->common.aml_opcode) { case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ case AML_WORD_OP: /* AML_WORDDATA_ARG */ case AML_DWORD_OP: /* AML_DWORDATA_ARG */ case AML_QWORD_OP: /* AML_QWORDATA_ARG */ case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ /* Fill in constant or string argument directly */ acpi_ps_get_next_simple_arg(&(walk_state->parser_state), GET_CURRENT_ARG_TYPE(walk_state-> arg_types), op); break; case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ status = acpi_ps_get_next_namepath(walk_state, &(walk_state->parser_state), op, ACPI_POSSIBLE_METHOD_CALL); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } walk_state->arg_types = 0; break; default: /* * Op is not a constant or string, append each argument to the Op */ while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) && !walk_state->arg_count) { walk_state->aml = walk_state->parser_state.aml; switch (op->common.aml_opcode) { case AML_METHOD_OP: case AML_BUFFER_OP: case AML_PACKAGE_OP: case AML_VARIABLE_PACKAGE_OP: case AML_WHILE_OP: break; default: ASL_CV_CAPTURE_COMMENTS(walk_state); break; } status = acpi_ps_get_next_arg(walk_state, &(walk_state->parser_state), GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } if (arg) { acpi_ps_append_arg(op, arg); } INCREMENT_ARG_LIST(walk_state->arg_types); } ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Final argument count: %8.8X pass %u\n", walk_state->arg_count, walk_state->pass_number)); /* * This case handles the legacy option that groups all module-level * code blocks together and defers execution until all of the tables * are loaded. Execute all of these blocks at this time. * Execute any module-level code that was detected during the table * load phase. * * Note: this option is deprecated and will be eliminated in the * future. Use of this option can cause problems with AML code that * depends upon in-order immediate execution of module-level code. */ if (acpi_gbl_group_module_level_code && (walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) && ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) { /* * We want to skip If/Else/While constructs during Pass1 because we * want to actually conditionally execute the code during Pass2. * * Except for disassembly, where we always want to walk the * If/Else/While packages */ switch (op->common.aml_opcode) { case AML_IF_OP: case AML_ELSE_OP: case AML_WHILE_OP: /* * Currently supported module-level opcodes are: * IF/ELSE/WHILE. These appear to be the most common, * and easiest to support since they open an AML * package. */ if (walk_state->pass_number == ACPI_IMODE_LOAD_PASS1) { acpi_ps_link_module_code(op->common. parent, aml_op_start, (u32) (walk_state-> parser_state. pkg_end - aml_op_start), walk_state-> owner_id); } ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Pass1: Skipping an If/Else/While body\n")); /* Skip body of if/else/while in pass 1 */ walk_state->parser_state.aml = walk_state->parser_state.pkg_end; walk_state->arg_count = 0; break; default: /* * Check for an unsupported executable opcode at module * level. We must be in PASS1, the parent must be a SCOPE, * The opcode class must be EXECUTE, and the opcode must * not be an argument to another opcode. */ if ((walk_state->pass_number == ACPI_IMODE_LOAD_PASS1) && (op->common.parent->common.aml_opcode == AML_SCOPE_OP)) { op_info = acpi_ps_get_opcode_info(op->common. aml_opcode); if ((op_info->class == AML_CLASS_EXECUTE) && (!arg)) { ACPI_WARNING((AE_INFO, "Unsupported module-level executable opcode " "0x%.2X at table offset 0x%.4X", op->common. aml_opcode, (u32) (ACPI_PTR_DIFF (aml_op_start, walk_state-> parser_state. aml_start) + sizeof(struct acpi_table_header)))); } } break; } } /* Special processing for certain opcodes */ switch (op->common.aml_opcode) { case AML_METHOD_OP: /* * Skip parsing of control method because we don't have enough * info in the first pass to parse it correctly. * * Save the length and address of the body */ op->named.data = walk_state->parser_state.aml; op->named.length = (u32) (walk_state->parser_state.pkg_end - walk_state->parser_state.aml); /* Skip body of method */ walk_state->parser_state.aml = walk_state->parser_state.pkg_end; walk_state->arg_count = 0; break; case AML_BUFFER_OP: case AML_PACKAGE_OP: case AML_VARIABLE_PACKAGE_OP: if ((op->common.parent) && (op->common.parent->common.aml_opcode == AML_NAME_OP) && (walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2)) { ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Setup Package/Buffer: Pass %u, AML Ptr: %p\n", walk_state->pass_number, aml_op_start)); /* * Skip parsing of Buffers and Packages because we don't have * enough info in the first pass to parse them correctly. */ op->named.data = aml_op_start; op->named.length = (u32) (walk_state->parser_state.pkg_end - aml_op_start); /* Skip body */ walk_state->parser_state.aml = walk_state->parser_state.pkg_end; walk_state->arg_count = 0; } break; case AML_WHILE_OP: if (walk_state->control_state) { walk_state->control_state->control.package_end = walk_state->parser_state.pkg_end; } break; default: /* No action for all other opcodes */ break; } break; } return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ps_link_module_code * * PARAMETERS: parent_op - Parent parser op * aml_start - Pointer to the AML * aml_length - Length of executable AML * owner_id - owner_id of module level code * * RETURN: None. * * DESCRIPTION: Wrap the module-level code with a method object and link the * object to the global list. Note, the mutex field of the method * object is used to link multiple module-level code objects. * * NOTE: In this legacy option, each block of detected executable AML * code that is outside of any control method is wrapped with a temporary * control method object and placed on a global list below. * * This function executes the module-level code for all tables only after * all of the tables have been loaded. It is a legacy option and is * not compatible with other ACPI implementations. See acpi_ns_load_table. * * This function will be removed when the legacy option is removed. * ******************************************************************************/ static void acpi_ps_link_module_code(union acpi_parse_object *parent_op, u8 *aml_start, u32 aml_length, acpi_owner_id owner_id) { union acpi_operand_object *prev; union acpi_operand_object *next; union acpi_operand_object *method_obj; struct acpi_namespace_node *parent_node; ACPI_FUNCTION_TRACE(ps_link_module_code); /* Get the tail of the list */ prev = next = acpi_gbl_module_code_list; while (next) { prev = next; next = next->method.mutex; } /* * Insert the module level code into the list. Merge it if it is * adjacent to the previous element. */ if (!prev || ((prev->method.aml_start + prev->method.aml_length) != aml_start)) { /* Create, initialize, and link a new temporary method object */ method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD); if (!method_obj) { return_VOID; } ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Create/Link new code block: %p\n", method_obj)); if (parent_op->common.node) { parent_node = parent_op->common.node; } else { parent_node = acpi_gbl_root_node; } method_obj->method.aml_start = aml_start; method_obj->method.aml_length = aml_length; method_obj->method.owner_id = owner_id; method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL; /* * Save the parent node in next_object. This is cheating, but we * don't want to expand the method object. */ method_obj->method.next_object = ACPI_CAST_PTR(union acpi_operand_object, parent_node); if (!prev) { acpi_gbl_module_code_list = method_obj; } else { prev->method.mutex = method_obj; } } else { ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Appending to existing code block: %p\n", prev)); prev->method.aml_length += aml_length; } return_VOID; } /******************************************************************************* * * FUNCTION: acpi_ps_parse_loop * * PARAMETERS: walk_state - Current state * * RETURN: Status * * DESCRIPTION: Parse AML (pointed to by the current parser state) and return * a tree of ops. * ******************************************************************************/ acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state) { acpi_status status = AE_OK; union acpi_parse_object *op = NULL; /* current op */ struct acpi_parse_state *parser_state; u8 *aml_op_start = NULL; u8 opcode_length; ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state); if (walk_state->descending_callback == NULL) { return_ACPI_STATUS(AE_BAD_PARAMETER); } parser_state = &walk_state->parser_state; walk_state->arg_types = 0; #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { /* We are restarting a preempted control method */ if (acpi_ps_has_completed_scope(parser_state)) { /* * We must check if a predicate to an IF or WHILE statement * was just completed */ if ((parser_state->scope->parse_scope.op) && ((parser_state->scope->parse_scope.op->common. aml_opcode == AML_IF_OP) || (parser_state->scope->parse_scope.op->common. aml_opcode == AML_WHILE_OP)) && (walk_state->control_state) && (walk_state->control_state->common.state == ACPI_CONTROL_PREDICATE_EXECUTING)) { /* * A predicate was just completed, get the value of the * predicate and branch based on that value */ walk_state->op = NULL; status = acpi_ds_get_predicate_value(walk_state, ACPI_TO_POINTER (TRUE)); if (ACPI_FAILURE(status) && ((status & AE_CODE_MASK) != AE_CODE_CONTROL)) { if (status == AE_AML_NO_RETURN_VALUE) { ACPI_EXCEPTION((AE_INFO, status, "Invoked method did not return a value")); } ACPI_EXCEPTION((AE_INFO, status, "GetPredicate Failed")); return_ACPI_STATUS(status); } status = acpi_ps_next_parse_state(walk_state, op, status); } acpi_ps_pop_scope(parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op)); } else if (walk_state->prev_op) { /* We were in the middle of an op */ op = walk_state->prev_op; walk_state->arg_types = walk_state->prev_arg_types; } } #endif /* Iterative parsing loop, while there is more AML to process: */ while ((parser_state->aml < parser_state->aml_end) || (op)) { ASL_CV_CAPTURE_COMMENTS(walk_state); aml_op_start = parser_state->aml; if (!op) { status = acpi_ps_create_op(walk_state, aml_op_start, &op); if (ACPI_FAILURE(status)) { /* * ACPI_PARSE_MODULE_LEVEL means that we are loading a table by * executing it as a control method. However, if we encounter * an error while loading the table, we need to keep trying to * load the table rather than aborting the table load. Set the * status to AE_OK to proceed with the table load. */ if ((walk_state-> parse_flags & ACPI_PARSE_MODULE_LEVEL) && status == AE_ALREADY_EXISTS) { status = AE_OK; } if (status == AE_CTRL_PARSE_CONTINUE) { continue; } if (status == AE_CTRL_PARSE_PENDING) { status = AE_OK; } if (status == AE_CTRL_TERMINATE) { return_ACPI_STATUS(status); } status = acpi_ps_complete_op(walk_state, &op, status); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } if (acpi_ns_opens_scope (acpi_ps_get_opcode_info (walk_state->opcode)->object_type)) { /* * If the scope/device op fails to parse, skip the body of * the scope op because the parse failure indicates that * the device may not exist. */ ACPI_ERROR((AE_INFO, "Skip parsing opcode %s", acpi_ps_get_opcode_name (walk_state->opcode))); /* * Determine the opcode length before skipping the opcode. * An opcode can be 1 byte or 2 bytes in length. */ opcode_length = 1; if ((walk_state->opcode & 0xFF00) == AML_EXTENDED_OPCODE) { opcode_length = 2; } walk_state->parser_state.aml = walk_state->aml + opcode_length; walk_state->parser_state.aml = acpi_ps_get_next_package_end (&walk_state->parser_state); walk_state->aml = walk_state->parser_state.aml; } continue; } acpi_ex_start_trace_opcode(op, walk_state); } /* * Start arg_count at zero because we don't know if there are * any args yet */ walk_state->arg_count = 0; switch (op->common.aml_opcode) { case AML_BYTE_OP: case AML_WORD_OP: case AML_DWORD_OP: case AML_QWORD_OP: break; default: ASL_CV_CAPTURE_COMMENTS(walk_state); break; } /* Are there any arguments that must be processed? */ if (walk_state->arg_types) { /* Get arguments */ status = acpi_ps_get_arguments(walk_state, aml_op_start, op); if (ACPI_FAILURE(status)) { status = acpi_ps_complete_op(walk_state, &op, status); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } if ((walk_state->control_state) && ((walk_state->control_state->control. opcode == AML_IF_OP) || (walk_state->control_state->control. opcode == AML_WHILE_OP))) { /* * If the if/while op fails to parse, we will skip parsing * the body of the op. */ parser_state->aml = walk_state->control_state->control. aml_predicate_start + 1; parser_state->aml = acpi_ps_get_next_package_end (parser_state); walk_state->aml = parser_state->aml; ACPI_ERROR((AE_INFO, "Skipping While/If block")); if (*walk_state->aml == AML_ELSE_OP) { ACPI_ERROR((AE_INFO, "Skipping Else block")); walk_state->parser_state.aml = walk_state->aml + 1; walk_state->parser_state.aml = acpi_ps_get_next_package_end (parser_state); walk_state->aml = parser_state->aml; } ACPI_FREE(acpi_ut_pop_generic_state (&walk_state->control_state)); } op = NULL; continue; } } /* Check for arguments that need to be processed */ ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Parseloop: argument count: %8.8X\n", walk_state->arg_count)); if (walk_state->arg_count) { /* * There are arguments (complex ones), push Op and * prepare for argument */ status = acpi_ps_push_scope(parser_state, op, walk_state->arg_types, walk_state->arg_count); if (ACPI_FAILURE(status)) { status = acpi_ps_complete_op(walk_state, &op, status); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } continue; } op = NULL; continue; } /* * All arguments have been processed -- Op is complete, * prepare for next */ walk_state->op_info = acpi_ps_get_opcode_info(op->common.aml_opcode); if (walk_state->op_info->flags & AML_NAMED) { if (op->common.aml_opcode == AML_REGION_OP || op->common.aml_opcode == AML_DATA_REGION_OP) { /* * Skip parsing of control method or opregion body, * because we don't have enough info in the first pass * to parse them correctly. * * Completed parsing an op_region declaration, we now * know the length. */ op->named.length = (u32) (parser_state->aml - op->named.data); } } if (walk_state->op_info->flags & AML_CREATE) { /* * Backup to beginning of create_XXXfield declaration (1 for * Opcode) * * body_length is unknown until we parse the body */ op->named.length = (u32) (parser_state->aml - op->named.data); } if (op->common.aml_opcode == AML_BANK_FIELD_OP) { /* * Backup to beginning of bank_field declaration * * body_length is unknown until we parse the body */ op->named.length = (u32) (parser_state->aml - op->named.data); } /* This op complete, notify the dispatcher */ if (walk_state->ascending_callback != NULL) { walk_state->op = op; walk_state->opcode = op->common.aml_opcode; status = walk_state->ascending_callback(walk_state); status = acpi_ps_next_parse_state(walk_state, op, status); if (status == AE_CTRL_PENDING) { status = AE_OK; } else if ((walk_state-> parse_flags & ACPI_PARSE_MODULE_LEVEL) && (ACPI_AML_EXCEPTION(status) || status == AE_ALREADY_EXISTS || status == AE_NOT_FOUND)) { /* * ACPI_PARSE_MODULE_LEVEL flag means that we * are currently loading a table by executing * it as a control method. However, if we * encounter an error while loading the table, * we need to keep trying to load the table * rather than aborting the table load (setting * the status to AE_OK continues the table * load). If we get a failure at this point, it * means that the dispatcher got an error while * trying to execute the Op. */ status = AE_OK; } } status = acpi_ps_complete_op(walk_state, &op, status); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } } /* while parser_state->Aml */ status = acpi_ps_complete_final_op(walk_state, op, status); return_ACPI_STATUS(status); } |