1 /****************************************************************************** 2 * 3 * Module Name: psloop - Main AML parse loop 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2014, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 /* 45 * Parse the AML and build an operation tree as most interpreters, (such as 46 * Perl) do. Parsing is done by hand rather than with a YACC generated parser 47 * to tightly constrain stack and dynamic memory usage. Parsing is kept 48 * flexible and the code fairly compact by parsing based on a list of AML 49 * opcode templates in aml_op_info[]. 50 */ 51 52 #include <acpi/acpi.h> 53 #include "accommon.h" 54 #include "acparser.h" 55 #include "acdispat.h" 56 #include "amlcode.h" 57 58 #define _COMPONENT ACPI_PARSER 59 ACPI_MODULE_NAME("psloop") 60 61 /* Local prototypes */ 62 static acpi_status 63 acpi_ps_get_arguments(struct acpi_walk_state *walk_state, 64 u8 * aml_op_start, union acpi_parse_object *op); 65 66 static void 67 acpi_ps_link_module_code(union acpi_parse_object *parent_op, 68 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id); 69 70 /******************************************************************************* 71 * 72 * FUNCTION: acpi_ps_get_arguments 73 * 74 * PARAMETERS: walk_state - Current state 75 * aml_op_start - Op start in AML 76 * op - Current Op 77 * 78 * RETURN: Status 79 * 80 * DESCRIPTION: Get arguments for passed Op. 81 * 82 ******************************************************************************/ 83 84 static acpi_status 85 acpi_ps_get_arguments(struct acpi_walk_state *walk_state, 86 u8 * aml_op_start, union acpi_parse_object *op) 87 { 88 acpi_status status = AE_OK; 89 union acpi_parse_object *arg = NULL; 90 const struct acpi_opcode_info *op_info; 91 92 ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state); 93 94 switch (op->common.aml_opcode) { 95 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ 96 case AML_WORD_OP: /* AML_WORDDATA_ARG */ 97 case AML_DWORD_OP: /* AML_DWORDATA_ARG */ 98 case AML_QWORD_OP: /* AML_QWORDATA_ARG */ 99 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ 100 101 /* Fill in constant or string argument directly */ 102 103 acpi_ps_get_next_simple_arg(&(walk_state->parser_state), 104 GET_CURRENT_ARG_TYPE(walk_state-> 105 arg_types), 106 op); 107 break; 108 109 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ 110 111 status = 112 acpi_ps_get_next_namepath(walk_state, 113 &(walk_state->parser_state), op, 114 1); 115 if (ACPI_FAILURE(status)) { 116 return_ACPI_STATUS(status); 117 } 118 119 walk_state->arg_types = 0; 120 break; 121 122 default: 123 /* 124 * Op is not a constant or string, append each argument to the Op 125 */ 126 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) 127 && !walk_state->arg_count) { 128 walk_state->aml_offset = 129 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml, 130 walk_state->parser_state. 131 aml_start); 132 133 status = 134 acpi_ps_get_next_arg(walk_state, 135 &(walk_state->parser_state), 136 GET_CURRENT_ARG_TYPE 137 (walk_state->arg_types), &arg); 138 if (ACPI_FAILURE(status)) { 139 return_ACPI_STATUS(status); 140 } 141 142 if (arg) { 143 arg->common.aml_offset = walk_state->aml_offset; 144 acpi_ps_append_arg(op, arg); 145 } 146 147 INCREMENT_ARG_LIST(walk_state->arg_types); 148 } 149 150 /* 151 * Handle executable code at "module-level". This refers to 152 * executable opcodes that appear outside of any control method. 153 */ 154 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) && 155 ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) { 156 /* 157 * We want to skip If/Else/While constructs during Pass1 because we 158 * want to actually conditionally execute the code during Pass2. 159 * 160 * Except for disassembly, where we always want to walk the 161 * If/Else/While packages 162 */ 163 switch (op->common.aml_opcode) { 164 case AML_IF_OP: 165 case AML_ELSE_OP: 166 case AML_WHILE_OP: 167 /* 168 * Currently supported module-level opcodes are: 169 * IF/ELSE/WHILE. These appear to be the most common, 170 * and easiest to support since they open an AML 171 * package. 172 */ 173 if (walk_state->pass_number == 174 ACPI_IMODE_LOAD_PASS1) { 175 acpi_ps_link_module_code(op->common. 176 parent, 177 aml_op_start, 178 (u32) 179 (walk_state-> 180 parser_state. 181 pkg_end - 182 aml_op_start), 183 walk_state-> 184 owner_id); 185 } 186 187 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 188 "Pass1: Skipping an If/Else/While body\n")); 189 190 /* Skip body of if/else/while in pass 1 */ 191 192 walk_state->parser_state.aml = 193 walk_state->parser_state.pkg_end; 194 walk_state->arg_count = 0; 195 break; 196 197 default: 198 /* 199 * Check for an unsupported executable opcode at module 200 * level. We must be in PASS1, the parent must be a SCOPE, 201 * The opcode class must be EXECUTE, and the opcode must 202 * not be an argument to another opcode. 203 */ 204 if ((walk_state->pass_number == 205 ACPI_IMODE_LOAD_PASS1) 206 && (op->common.parent->common.aml_opcode == 207 AML_SCOPE_OP)) { 208 op_info = 209 acpi_ps_get_opcode_info(op->common. 210 aml_opcode); 211 if ((op_info->class == 212 AML_CLASS_EXECUTE) && (!arg)) { 213 ACPI_WARNING((AE_INFO, 214 "Unsupported module-level executable opcode " 215 "0x%.2X at table offset 0x%.4X", 216 op->common. 217 aml_opcode, 218 (u32) 219 (ACPI_PTR_DIFF 220 (aml_op_start, 221 walk_state-> 222 parser_state. 223 aml_start) + 224 sizeof(struct 225 acpi_table_header)))); 226 } 227 } 228 break; 229 } 230 } 231 232 /* Special processing for certain opcodes */ 233 234 switch (op->common.aml_opcode) { 235 case AML_METHOD_OP: 236 /* 237 * Skip parsing of control method because we don't have enough 238 * info in the first pass to parse it correctly. 239 * 240 * Save the length and address of the body 241 */ 242 op->named.data = walk_state->parser_state.aml; 243 op->named.length = (u32) 244 (walk_state->parser_state.pkg_end - 245 walk_state->parser_state.aml); 246 247 /* Skip body of method */ 248 249 walk_state->parser_state.aml = 250 walk_state->parser_state.pkg_end; 251 walk_state->arg_count = 0; 252 break; 253 254 case AML_BUFFER_OP: 255 case AML_PACKAGE_OP: 256 case AML_VAR_PACKAGE_OP: 257 258 if ((op->common.parent) && 259 (op->common.parent->common.aml_opcode == 260 AML_NAME_OP) 261 && (walk_state->pass_number <= 262 ACPI_IMODE_LOAD_PASS2)) { 263 /* 264 * Skip parsing of Buffers and Packages because we don't have 265 * enough info in the first pass to parse them correctly. 266 */ 267 op->named.data = aml_op_start; 268 op->named.length = (u32) 269 (walk_state->parser_state.pkg_end - 270 aml_op_start); 271 272 /* Skip body */ 273 274 walk_state->parser_state.aml = 275 walk_state->parser_state.pkg_end; 276 walk_state->arg_count = 0; 277 } 278 break; 279 280 case AML_WHILE_OP: 281 282 if (walk_state->control_state) { 283 walk_state->control_state->control.package_end = 284 walk_state->parser_state.pkg_end; 285 } 286 break; 287 288 default: 289 290 /* No action for all other opcodes */ 291 292 break; 293 } 294 295 break; 296 } 297 298 return_ACPI_STATUS(AE_OK); 299 } 300 301 /******************************************************************************* 302 * 303 * FUNCTION: acpi_ps_link_module_code 304 * 305 * PARAMETERS: parent_op - Parent parser op 306 * aml_start - Pointer to the AML 307 * aml_length - Length of executable AML 308 * owner_id - owner_id of module level code 309 * 310 * RETURN: None. 311 * 312 * DESCRIPTION: Wrap the module-level code with a method object and link the 313 * object to the global list. Note, the mutex field of the method 314 * object is used to link multiple module-level code objects. 315 * 316 ******************************************************************************/ 317 318 static void 319 acpi_ps_link_module_code(union acpi_parse_object *parent_op, 320 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id) 321 { 322 union acpi_operand_object *prev; 323 union acpi_operand_object *next; 324 union acpi_operand_object *method_obj; 325 struct acpi_namespace_node *parent_node; 326 327 /* Get the tail of the list */ 328 329 prev = next = acpi_gbl_module_code_list; 330 while (next) { 331 prev = next; 332 next = next->method.mutex; 333 } 334 335 /* 336 * Insert the module level code into the list. Merge it if it is 337 * adjacent to the previous element. 338 */ 339 if (!prev || 340 ((prev->method.aml_start + prev->method.aml_length) != aml_start)) { 341 342 /* Create, initialize, and link a new temporary method object */ 343 344 method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD); 345 if (!method_obj) { 346 return; 347 } 348 349 if (parent_op->common.node) { 350 parent_node = parent_op->common.node; 351 } else { 352 parent_node = acpi_gbl_root_node; 353 } 354 355 method_obj->method.aml_start = aml_start; 356 method_obj->method.aml_length = aml_length; 357 method_obj->method.owner_id = owner_id; 358 method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL; 359 360 /* 361 * Save the parent node in next_object. This is cheating, but we 362 * don't want to expand the method object. 363 */ 364 method_obj->method.next_object = 365 ACPI_CAST_PTR(union acpi_operand_object, parent_node); 366 367 if (!prev) { 368 acpi_gbl_module_code_list = method_obj; 369 } else { 370 prev->method.mutex = method_obj; 371 } 372 } else { 373 prev->method.aml_length += aml_length; 374 } 375 } 376 377 /******************************************************************************* 378 * 379 * FUNCTION: acpi_ps_parse_loop 380 * 381 * PARAMETERS: walk_state - Current state 382 * 383 * RETURN: Status 384 * 385 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return 386 * a tree of ops. 387 * 388 ******************************************************************************/ 389 390 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state) 391 { 392 acpi_status status = AE_OK; 393 union acpi_parse_object *op = NULL; /* current op */ 394 struct acpi_parse_state *parser_state; 395 u8 *aml_op_start = NULL; 396 397 ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state); 398 399 if (walk_state->descending_callback == NULL) { 400 return_ACPI_STATUS(AE_BAD_PARAMETER); 401 } 402 403 parser_state = &walk_state->parser_state; 404 walk_state->arg_types = 0; 405 406 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) 407 408 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { 409 410 /* We are restarting a preempted control method */ 411 412 if (acpi_ps_has_completed_scope(parser_state)) { 413 /* 414 * We must check if a predicate to an IF or WHILE statement 415 * was just completed 416 */ 417 if ((parser_state->scope->parse_scope.op) && 418 ((parser_state->scope->parse_scope.op->common. 419 aml_opcode == AML_IF_OP) 420 || (parser_state->scope->parse_scope.op->common. 421 aml_opcode == AML_WHILE_OP)) 422 && (walk_state->control_state) 423 && (walk_state->control_state->common.state == 424 ACPI_CONTROL_PREDICATE_EXECUTING)) { 425 /* 426 * A predicate was just completed, get the value of the 427 * predicate and branch based on that value 428 */ 429 walk_state->op = NULL; 430 status = 431 acpi_ds_get_predicate_value(walk_state, 432 ACPI_TO_POINTER 433 (TRUE)); 434 if (ACPI_FAILURE(status) 435 && ((status & AE_CODE_MASK) != 436 AE_CODE_CONTROL)) { 437 if (status == AE_AML_NO_RETURN_VALUE) { 438 ACPI_EXCEPTION((AE_INFO, status, 439 "Invoked method did not return a value")); 440 } 441 442 ACPI_EXCEPTION((AE_INFO, status, 443 "GetPredicate Failed")); 444 return_ACPI_STATUS(status); 445 } 446 447 status = 448 acpi_ps_next_parse_state(walk_state, op, 449 status); 450 } 451 452 acpi_ps_pop_scope(parser_state, &op, 453 &walk_state->arg_types, 454 &walk_state->arg_count); 455 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 456 "Popped scope, Op=%p\n", op)); 457 } else if (walk_state->prev_op) { 458 459 /* We were in the middle of an op */ 460 461 op = walk_state->prev_op; 462 walk_state->arg_types = walk_state->prev_arg_types; 463 } 464 } 465 #endif 466 467 /* Iterative parsing loop, while there is more AML to process: */ 468 469 while ((parser_state->aml < parser_state->aml_end) || (op)) { 470 aml_op_start = parser_state->aml; 471 if (!op) { 472 status = 473 acpi_ps_create_op(walk_state, aml_op_start, &op); 474 if (ACPI_FAILURE(status)) { 475 if (status == AE_CTRL_PARSE_CONTINUE) { 476 continue; 477 } 478 479 if (status == AE_CTRL_PARSE_PENDING) { 480 status = AE_OK; 481 } 482 483 if (status == AE_CTRL_TERMINATE) { 484 return_ACPI_STATUS(status); 485 } 486 487 status = 488 acpi_ps_complete_op(walk_state, &op, 489 status); 490 if (ACPI_FAILURE(status)) { 491 return_ACPI_STATUS(status); 492 } 493 494 continue; 495 } 496 497 op->common.aml_offset = walk_state->aml_offset; 498 499 if (walk_state->op_info) { 500 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 501 "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n", 502 (u32) op->common.aml_opcode, 503 walk_state->op_info->name, op, 504 parser_state->aml, 505 op->common.aml_offset)); 506 } 507 } 508 509 /* 510 * Start arg_count at zero because we don't know if there are 511 * any args yet 512 */ 513 walk_state->arg_count = 0; 514 515 /* Are there any arguments that must be processed? */ 516 517 if (walk_state->arg_types) { 518 519 /* Get arguments */ 520 521 status = 522 acpi_ps_get_arguments(walk_state, aml_op_start, op); 523 if (ACPI_FAILURE(status)) { 524 status = 525 acpi_ps_complete_op(walk_state, &op, 526 status); 527 if (ACPI_FAILURE(status)) { 528 return_ACPI_STATUS(status); 529 } 530 531 continue; 532 } 533 } 534 535 /* Check for arguments that need to be processed */ 536 537 if (walk_state->arg_count) { 538 /* 539 * There are arguments (complex ones), push Op and 540 * prepare for argument 541 */ 542 status = acpi_ps_push_scope(parser_state, op, 543 walk_state->arg_types, 544 walk_state->arg_count); 545 if (ACPI_FAILURE(status)) { 546 status = 547 acpi_ps_complete_op(walk_state, &op, 548 status); 549 if (ACPI_FAILURE(status)) { 550 return_ACPI_STATUS(status); 551 } 552 553 continue; 554 } 555 556 op = NULL; 557 continue; 558 } 559 560 /* 561 * All arguments have been processed -- Op is complete, 562 * prepare for next 563 */ 564 walk_state->op_info = 565 acpi_ps_get_opcode_info(op->common.aml_opcode); 566 if (walk_state->op_info->flags & AML_NAMED) { 567 if (op->common.aml_opcode == AML_REGION_OP || 568 op->common.aml_opcode == AML_DATA_REGION_OP) { 569 /* 570 * Skip parsing of control method or opregion body, 571 * because we don't have enough info in the first pass 572 * to parse them correctly. 573 * 574 * Completed parsing an op_region declaration, we now 575 * know the length. 576 */ 577 op->named.length = 578 (u32) (parser_state->aml - op->named.data); 579 } 580 } 581 582 if (walk_state->op_info->flags & AML_CREATE) { 583 /* 584 * Backup to beginning of create_XXXfield declaration (1 for 585 * Opcode) 586 * 587 * body_length is unknown until we parse the body 588 */ 589 op->named.length = 590 (u32) (parser_state->aml - op->named.data); 591 } 592 593 if (op->common.aml_opcode == AML_BANK_FIELD_OP) { 594 /* 595 * Backup to beginning of bank_field declaration 596 * 597 * body_length is unknown until we parse the body 598 */ 599 op->named.length = 600 (u32) (parser_state->aml - op->named.data); 601 } 602 603 /* This op complete, notify the dispatcher */ 604 605 if (walk_state->ascending_callback != NULL) { 606 walk_state->op = op; 607 walk_state->opcode = op->common.aml_opcode; 608 609 status = walk_state->ascending_callback(walk_state); 610 status = 611 acpi_ps_next_parse_state(walk_state, op, status); 612 if (status == AE_CTRL_PENDING) { 613 status = AE_OK; 614 } 615 } 616 617 status = acpi_ps_complete_op(walk_state, &op, status); 618 if (ACPI_FAILURE(status)) { 619 return_ACPI_STATUS(status); 620 } 621 622 } /* while parser_state->Aml */ 623 624 status = acpi_ps_complete_final_op(walk_state, op, status); 625 return_ACPI_STATUS(status); 626 } 627