1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: psobject - Support for parse objects 5 * 6 * Copyright (C) 2000 - 2018, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 #include "acparser.h" 13 #include "amlcode.h" 14 #include "acconvert.h" 15 #include "acnamesp.h" 16 17 #define _COMPONENT ACPI_PARSER 18 ACPI_MODULE_NAME("psobject") 19 20 /* Local prototypes */ 21 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state); 22 23 /******************************************************************************* 24 * 25 * FUNCTION: acpi_ps_get_aml_opcode 26 * 27 * PARAMETERS: walk_state - Current state 28 * 29 * RETURN: Status 30 * 31 * DESCRIPTION: Extract the next AML opcode from the input stream. 32 * 33 ******************************************************************************/ 34 35 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state) 36 { 37 ACPI_ERROR_ONLY(u32 aml_offset); 38 39 ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state); 40 41 walk_state->aml = walk_state->parser_state.aml; 42 walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state)); 43 44 /* 45 * First cut to determine what we have found: 46 * 1) A valid AML opcode 47 * 2) A name string 48 * 3) An unknown/invalid opcode 49 */ 50 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode); 51 52 switch (walk_state->op_info->class) { 53 case AML_CLASS_ASCII: 54 case AML_CLASS_PREFIX: 55 /* 56 * Starts with a valid prefix or ASCII char, this is a name 57 * string. Convert the bare name string to a namepath. 58 */ 59 walk_state->opcode = AML_INT_NAMEPATH_OP; 60 walk_state->arg_types = ARGP_NAMESTRING; 61 break; 62 63 case AML_CLASS_UNKNOWN: 64 65 /* The opcode is unrecognized. Complain and skip unknown opcodes */ 66 67 if (walk_state->pass_number == 2) { 68 ACPI_ERROR_ONLY(aml_offset = 69 (u32)ACPI_PTR_DIFF(walk_state->aml, 70 walk_state-> 71 parser_state. 72 aml_start)); 73 74 ACPI_ERROR((AE_INFO, 75 "Unknown opcode 0x%.2X at table offset 0x%.4X, ignoring", 76 walk_state->opcode, 77 (u32)(aml_offset + 78 sizeof(struct acpi_table_header)))); 79 80 ACPI_DUMP_BUFFER((walk_state->parser_state.aml - 16), 81 48); 82 83 #ifdef ACPI_ASL_COMPILER 84 /* 85 * This is executed for the disassembler only. Output goes 86 * to the disassembled ASL output file. 87 */ 88 acpi_os_printf 89 ("/*\nError: Unknown opcode 0x%.2X at table offset 0x%.4X, context:\n", 90 walk_state->opcode, 91 (u32)(aml_offset + 92 sizeof(struct acpi_table_header))); 93 94 ACPI_ERROR((AE_INFO, 95 "Aborting disassembly, AML byte code is corrupt")); 96 97 /* Dump the context surrounding the invalid opcode */ 98 99 acpi_ut_dump_buffer(((u8 *)walk_state->parser_state. 100 aml - 16), 48, DB_BYTE_DISPLAY, 101 (aml_offset + 102 sizeof(struct acpi_table_header) - 103 16)); 104 acpi_os_printf(" */\n"); 105 106 /* 107 * Just abort the disassembly, cannot continue because the 108 * parser is essentially lost. The disassembler can then 109 * randomly fail because an ill-constructed parse tree 110 * can result. 111 */ 112 return_ACPI_STATUS(AE_AML_BAD_OPCODE); 113 #endif 114 } 115 116 /* Increment past one-byte or two-byte opcode */ 117 118 walk_state->parser_state.aml++; 119 if (walk_state->opcode > 0xFF) { /* Can only happen if first byte is 0x5B */ 120 walk_state->parser_state.aml++; 121 } 122 123 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); 124 125 default: 126 127 /* Found opcode info, this is a normal opcode */ 128 129 walk_state->parser_state.aml += 130 acpi_ps_get_opcode_size(walk_state->opcode); 131 walk_state->arg_types = walk_state->op_info->parse_args; 132 break; 133 } 134 135 return_ACPI_STATUS(AE_OK); 136 } 137 138 /******************************************************************************* 139 * 140 * FUNCTION: acpi_ps_build_named_op 141 * 142 * PARAMETERS: walk_state - Current state 143 * aml_op_start - Begin of named Op in AML 144 * unnamed_op - Early Op (not a named Op) 145 * op - Returned Op 146 * 147 * RETURN: Status 148 * 149 * DESCRIPTION: Parse a named Op 150 * 151 ******************************************************************************/ 152 153 acpi_status 154 acpi_ps_build_named_op(struct acpi_walk_state *walk_state, 155 u8 *aml_op_start, 156 union acpi_parse_object *unnamed_op, 157 union acpi_parse_object **op) 158 { 159 acpi_status status = AE_OK; 160 union acpi_parse_object *arg = NULL; 161 162 ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state); 163 164 unnamed_op->common.value.arg = NULL; 165 unnamed_op->common.arg_list_length = 0; 166 unnamed_op->common.aml_opcode = walk_state->opcode; 167 168 /* 169 * Get and append arguments until we find the node that contains 170 * the name (the type ARGP_NAME). 171 */ 172 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) && 173 (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) { 174 ASL_CV_CAPTURE_COMMENTS(walk_state); 175 status = 176 acpi_ps_get_next_arg(walk_state, 177 &(walk_state->parser_state), 178 GET_CURRENT_ARG_TYPE(walk_state-> 179 arg_types), &arg); 180 if (ACPI_FAILURE(status)) { 181 return_ACPI_STATUS(status); 182 } 183 184 acpi_ps_append_arg(unnamed_op, arg); 185 INCREMENT_ARG_LIST(walk_state->arg_types); 186 } 187 188 /* are there any inline comments associated with the name_seg?? If so, save this. */ 189 190 ASL_CV_CAPTURE_COMMENTS(walk_state); 191 192 #ifdef ACPI_ASL_COMPILER 193 if (acpi_gbl_current_inline_comment != NULL) { 194 unnamed_op->common.name_comment = 195 acpi_gbl_current_inline_comment; 196 acpi_gbl_current_inline_comment = NULL; 197 } 198 #endif 199 200 /* 201 * Make sure that we found a NAME and didn't run out of arguments 202 */ 203 if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) { 204 return_ACPI_STATUS(AE_AML_NO_OPERAND); 205 } 206 207 /* We know that this arg is a name, move to next arg */ 208 209 INCREMENT_ARG_LIST(walk_state->arg_types); 210 211 /* 212 * Find the object. This will either insert the object into 213 * the namespace or simply look it up 214 */ 215 walk_state->op = NULL; 216 217 status = walk_state->descending_callback(walk_state, op); 218 if (ACPI_FAILURE(status)) { 219 if (status != AE_CTRL_TERMINATE) { 220 ACPI_EXCEPTION((AE_INFO, status, 221 "During name lookup/catalog")); 222 } 223 return_ACPI_STATUS(status); 224 } 225 226 if (!*op) { 227 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); 228 } 229 230 status = acpi_ps_next_parse_state(walk_state, *op, status); 231 if (ACPI_FAILURE(status)) { 232 if (status == AE_CTRL_PENDING) { 233 status = AE_CTRL_PARSE_PENDING; 234 } 235 return_ACPI_STATUS(status); 236 } 237 238 acpi_ps_append_arg(*op, unnamed_op->common.value.arg); 239 240 #ifdef ACPI_ASL_COMPILER 241 242 /* save any comments that might be associated with unnamed_op. */ 243 244 (*op)->common.inline_comment = unnamed_op->common.inline_comment; 245 (*op)->common.end_node_comment = unnamed_op->common.end_node_comment; 246 (*op)->common.close_brace_comment = 247 unnamed_op->common.close_brace_comment; 248 (*op)->common.name_comment = unnamed_op->common.name_comment; 249 (*op)->common.comment_list = unnamed_op->common.comment_list; 250 (*op)->common.end_blk_comment = unnamed_op->common.end_blk_comment; 251 (*op)->common.cv_filename = unnamed_op->common.cv_filename; 252 (*op)->common.cv_parent_filename = 253 unnamed_op->common.cv_parent_filename; 254 (*op)->named.aml = unnamed_op->common.aml; 255 256 unnamed_op->common.inline_comment = NULL; 257 unnamed_op->common.end_node_comment = NULL; 258 unnamed_op->common.close_brace_comment = NULL; 259 unnamed_op->common.name_comment = NULL; 260 unnamed_op->common.comment_list = NULL; 261 unnamed_op->common.end_blk_comment = NULL; 262 #endif 263 264 if ((*op)->common.aml_opcode == AML_REGION_OP || 265 (*op)->common.aml_opcode == AML_DATA_REGION_OP) { 266 /* 267 * Defer final parsing of an operation_region body, because we don't 268 * have enough info in the first pass to parse it correctly (i.e., 269 * there may be method calls within the term_arg elements of the body.) 270 * 271 * However, we must continue parsing because the opregion is not a 272 * standalone package -- we don't know where the end is at this point. 273 * 274 * (Length is unknown until parse of the body complete) 275 */ 276 (*op)->named.data = aml_op_start; 277 (*op)->named.length = 0; 278 } 279 280 return_ACPI_STATUS(AE_OK); 281 } 282 283 /******************************************************************************* 284 * 285 * FUNCTION: acpi_ps_create_op 286 * 287 * PARAMETERS: walk_state - Current state 288 * aml_op_start - Op start in AML 289 * new_op - Returned Op 290 * 291 * RETURN: Status 292 * 293 * DESCRIPTION: Get Op from AML 294 * 295 ******************************************************************************/ 296 297 acpi_status 298 acpi_ps_create_op(struct acpi_walk_state *walk_state, 299 u8 *aml_op_start, union acpi_parse_object **new_op) 300 { 301 acpi_status status = AE_OK; 302 union acpi_parse_object *op; 303 union acpi_parse_object *named_op = NULL; 304 union acpi_parse_object *parent_scope; 305 u8 argument_count; 306 const struct acpi_opcode_info *op_info; 307 308 ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state); 309 310 status = acpi_ps_get_aml_opcode(walk_state); 311 if (status == AE_CTRL_PARSE_CONTINUE) { 312 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); 313 } 314 if (ACPI_FAILURE(status)) { 315 return_ACPI_STATUS(status); 316 } 317 318 /* Create Op structure and append to parent's argument list */ 319 320 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode); 321 op = acpi_ps_alloc_op(walk_state->opcode, aml_op_start); 322 if (!op) { 323 return_ACPI_STATUS(AE_NO_MEMORY); 324 } 325 326 if (walk_state->op_info->flags & AML_NAMED) { 327 status = 328 acpi_ps_build_named_op(walk_state, aml_op_start, op, 329 &named_op); 330 acpi_ps_free_op(op); 331 332 #ifdef ACPI_ASL_COMPILER 333 if (acpi_gbl_disasm_flag 334 && walk_state->opcode == AML_EXTERNAL_OP 335 && status == AE_NOT_FOUND) { 336 /* 337 * If parsing of AML_EXTERNAL_OP's name path fails, then skip 338 * past this opcode and keep parsing. This is a much better 339 * alternative than to abort the entire disassembler. At this 340 * point, the parser_state is at the end of the namepath of the 341 * external declaration opcode. Setting walk_state->Aml to 342 * walk_state->parser_state.Aml + 2 moves increments the 343 * walk_state->Aml past the object type and the paramcount of the 344 * external opcode. 345 */ 346 walk_state->aml = walk_state->parser_state.aml + 2; 347 walk_state->parser_state.aml = walk_state->aml; 348 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); 349 } 350 #endif 351 if (ACPI_FAILURE(status)) { 352 return_ACPI_STATUS(status); 353 } 354 355 *new_op = named_op; 356 return_ACPI_STATUS(AE_OK); 357 } 358 359 /* Not a named opcode, just allocate Op and append to parent */ 360 361 if (walk_state->op_info->flags & AML_CREATE) { 362 /* 363 * Backup to beginning of create_XXXfield declaration 364 * body_length is unknown until we parse the body 365 */ 366 op->named.data = aml_op_start; 367 op->named.length = 0; 368 } 369 370 if (walk_state->opcode == AML_BANK_FIELD_OP) { 371 /* 372 * Backup to beginning of bank_field declaration 373 * body_length is unknown until we parse the body 374 */ 375 op->named.data = aml_op_start; 376 op->named.length = 0; 377 } 378 379 parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state)); 380 acpi_ps_append_arg(parent_scope, op); 381 382 if (parent_scope) { 383 op_info = 384 acpi_ps_get_opcode_info(parent_scope->common.aml_opcode); 385 if (op_info->flags & AML_HAS_TARGET) { 386 argument_count = 387 acpi_ps_get_argument_count(op_info->type); 388 if (parent_scope->common.arg_list_length > 389 argument_count) { 390 op->common.flags |= ACPI_PARSEOP_TARGET; 391 } 392 } 393 394 /* 395 * Special case for both Increment() and Decrement(), where 396 * the lone argument is both a source and a target. 397 */ 398 else if ((parent_scope->common.aml_opcode == AML_INCREMENT_OP) 399 || (parent_scope->common.aml_opcode == 400 AML_DECREMENT_OP)) { 401 op->common.flags |= ACPI_PARSEOP_TARGET; 402 } 403 } 404 405 if (walk_state->descending_callback != NULL) { 406 /* 407 * Find the object. This will either insert the object into 408 * the namespace or simply look it up 409 */ 410 walk_state->op = *new_op = op; 411 412 status = walk_state->descending_callback(walk_state, &op); 413 status = acpi_ps_next_parse_state(walk_state, op, status); 414 if (status == AE_CTRL_PENDING) { 415 status = AE_CTRL_PARSE_PENDING; 416 } 417 } 418 419 return_ACPI_STATUS(status); 420 } 421 422 /******************************************************************************* 423 * 424 * FUNCTION: acpi_ps_complete_op 425 * 426 * PARAMETERS: walk_state - Current state 427 * op - Returned Op 428 * status - Parse status before complete Op 429 * 430 * RETURN: Status 431 * 432 * DESCRIPTION: Complete Op 433 * 434 ******************************************************************************/ 435 436 acpi_status 437 acpi_ps_complete_op(struct acpi_walk_state *walk_state, 438 union acpi_parse_object **op, acpi_status status) 439 { 440 acpi_status status2; 441 442 ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state); 443 444 /* 445 * Finished one argument of the containing scope 446 */ 447 walk_state->parser_state.scope->parse_scope.arg_count--; 448 449 /* Close this Op (will result in parse subtree deletion) */ 450 451 status2 = acpi_ps_complete_this_op(walk_state, *op); 452 if (ACPI_FAILURE(status2)) { 453 return_ACPI_STATUS(status2); 454 } 455 456 *op = NULL; 457 458 switch (status) { 459 case AE_OK: 460 461 break; 462 463 case AE_CTRL_TRANSFER: 464 465 /* We are about to transfer to a called method */ 466 467 walk_state->prev_op = NULL; 468 walk_state->prev_arg_types = walk_state->arg_types; 469 return_ACPI_STATUS(status); 470 471 case AE_CTRL_END: 472 473 acpi_ps_pop_scope(&(walk_state->parser_state), op, 474 &walk_state->arg_types, 475 &walk_state->arg_count); 476 477 if (*op) { 478 walk_state->op = *op; 479 walk_state->op_info = 480 acpi_ps_get_opcode_info((*op)->common.aml_opcode); 481 walk_state->opcode = (*op)->common.aml_opcode; 482 483 status = walk_state->ascending_callback(walk_state); 484 status = 485 acpi_ps_next_parse_state(walk_state, *op, status); 486 487 status2 = acpi_ps_complete_this_op(walk_state, *op); 488 if (ACPI_FAILURE(status2)) { 489 return_ACPI_STATUS(status2); 490 } 491 } 492 493 status = AE_OK; 494 break; 495 496 case AE_CTRL_BREAK: 497 case AE_CTRL_CONTINUE: 498 499 /* Pop off scopes until we find the While */ 500 501 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) { 502 acpi_ps_pop_scope(&(walk_state->parser_state), op, 503 &walk_state->arg_types, 504 &walk_state->arg_count); 505 } 506 507 /* Close this iteration of the While loop */ 508 509 walk_state->op = *op; 510 walk_state->op_info = 511 acpi_ps_get_opcode_info((*op)->common.aml_opcode); 512 walk_state->opcode = (*op)->common.aml_opcode; 513 514 status = walk_state->ascending_callback(walk_state); 515 status = acpi_ps_next_parse_state(walk_state, *op, status); 516 517 status2 = acpi_ps_complete_this_op(walk_state, *op); 518 if (ACPI_FAILURE(status2)) { 519 return_ACPI_STATUS(status2); 520 } 521 522 status = AE_OK; 523 break; 524 525 case AE_CTRL_TERMINATE: 526 527 /* Clean up */ 528 do { 529 if (*op) { 530 status2 = 531 acpi_ps_complete_this_op(walk_state, *op); 532 if (ACPI_FAILURE(status2)) { 533 return_ACPI_STATUS(status2); 534 } 535 536 acpi_ut_delete_generic_state 537 (acpi_ut_pop_generic_state 538 (&walk_state->control_state)); 539 } 540 541 acpi_ps_pop_scope(&(walk_state->parser_state), op, 542 &walk_state->arg_types, 543 &walk_state->arg_count); 544 545 } while (*op); 546 547 return_ACPI_STATUS(AE_OK); 548 549 default: /* All other non-AE_OK status */ 550 551 do { 552 if (*op) { 553 /* 554 * These Opcodes need to be removed from the namespace because they 555 * get created even if these opcodes cannot be created due to 556 * errors. 557 */ 558 if (((*op)->common.aml_opcode == AML_REGION_OP) 559 || ((*op)->common.aml_opcode == 560 AML_DATA_REGION_OP)) { 561 acpi_ns_delete_children((*op)->common. 562 node); 563 acpi_ns_remove_node((*op)->common.node); 564 (*op)->common.node = NULL; 565 acpi_ps_delete_parse_tree(*op); 566 } 567 568 status2 = 569 acpi_ps_complete_this_op(walk_state, *op); 570 if (ACPI_FAILURE(status2)) { 571 return_ACPI_STATUS(status2); 572 } 573 } 574 575 acpi_ps_pop_scope(&(walk_state->parser_state), op, 576 &walk_state->arg_types, 577 &walk_state->arg_count); 578 579 } while (*op); 580 581 #if 0 582 /* 583 * TBD: Cleanup parse ops on error 584 */ 585 if (*op == NULL) { 586 acpi_ps_pop_scope(parser_state, op, 587 &walk_state->arg_types, 588 &walk_state->arg_count); 589 } 590 #endif 591 walk_state->prev_op = NULL; 592 walk_state->prev_arg_types = walk_state->arg_types; 593 594 if (walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL) { 595 /* 596 * There was something that went wrong while executing code at the 597 * module-level. We need to skip parsing whatever caused the 598 * error and keep going. One runtime error during the table load 599 * should not cause the entire table to not be loaded. This is 600 * because there could be correct AML beyond the parts that caused 601 * the runtime error. 602 */ 603 ACPI_ERROR((AE_INFO, 604 "Ignore error and continue table load")); 605 return_ACPI_STATUS(AE_OK); 606 } 607 return_ACPI_STATUS(status); 608 } 609 610 /* This scope complete? */ 611 612 if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) { 613 acpi_ps_pop_scope(&(walk_state->parser_state), op, 614 &walk_state->arg_types, 615 &walk_state->arg_count); 616 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op)); 617 } else { 618 *op = NULL; 619 } 620 621 return_ACPI_STATUS(AE_OK); 622 } 623 624 /******************************************************************************* 625 * 626 * FUNCTION: acpi_ps_complete_final_op 627 * 628 * PARAMETERS: walk_state - Current state 629 * op - Current Op 630 * status - Current parse status before complete last 631 * Op 632 * 633 * RETURN: Status 634 * 635 * DESCRIPTION: Complete last Op. 636 * 637 ******************************************************************************/ 638 639 acpi_status 640 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state, 641 union acpi_parse_object *op, acpi_status status) 642 { 643 acpi_status status2; 644 645 ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state); 646 647 /* 648 * Complete the last Op (if not completed), and clear the scope stack. 649 * It is easily possible to end an AML "package" with an unbounded number 650 * of open scopes (such as when several ASL blocks are closed with 651 * sequential closing braces). We want to terminate each one cleanly. 652 */ 653 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n", 654 op)); 655 do { 656 if (op) { 657 if (walk_state->ascending_callback != NULL) { 658 walk_state->op = op; 659 walk_state->op_info = 660 acpi_ps_get_opcode_info(op->common. 661 aml_opcode); 662 walk_state->opcode = op->common.aml_opcode; 663 664 status = 665 walk_state->ascending_callback(walk_state); 666 status = 667 acpi_ps_next_parse_state(walk_state, op, 668 status); 669 if (status == AE_CTRL_PENDING) { 670 status = 671 acpi_ps_complete_op(walk_state, &op, 672 AE_OK); 673 if (ACPI_FAILURE(status)) { 674 return_ACPI_STATUS(status); 675 } 676 } 677 678 if (status == AE_CTRL_TERMINATE) { 679 status = AE_OK; 680 681 /* Clean up */ 682 do { 683 if (op) { 684 status2 = 685 acpi_ps_complete_this_op 686 (walk_state, op); 687 if (ACPI_FAILURE 688 (status2)) { 689 return_ACPI_STATUS 690 (status2); 691 } 692 } 693 694 acpi_ps_pop_scope(& 695 (walk_state-> 696 parser_state), 697 &op, 698 &walk_state-> 699 arg_types, 700 &walk_state-> 701 arg_count); 702 703 } while (op); 704 705 return_ACPI_STATUS(status); 706 } 707 708 else if (ACPI_FAILURE(status)) { 709 710 /* First error is most important */ 711 712 (void) 713 acpi_ps_complete_this_op(walk_state, 714 op); 715 return_ACPI_STATUS(status); 716 } 717 } 718 719 status2 = acpi_ps_complete_this_op(walk_state, op); 720 if (ACPI_FAILURE(status2)) { 721 return_ACPI_STATUS(status2); 722 } 723 } 724 725 acpi_ps_pop_scope(&(walk_state->parser_state), &op, 726 &walk_state->arg_types, 727 &walk_state->arg_count); 728 729 } while (op); 730 731 return_ACPI_STATUS(status); 732 } 733