1 /****************************************************************************** 2 * 3 * Module Name: psobject - Support for parse objects 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2013, 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 #include <acpi/acpi.h> 45 #include "accommon.h" 46 #include "acparser.h" 47 #include "amlcode.h" 48 49 #define _COMPONENT ACPI_PARSER 50 ACPI_MODULE_NAME("psobject") 51 52 /* Local prototypes */ 53 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state); 54 55 /******************************************************************************* 56 * 57 * FUNCTION: acpi_ps_get_aml_opcode 58 * 59 * PARAMETERS: walk_state - Current state 60 * 61 * RETURN: Status 62 * 63 * DESCRIPTION: Extract the next AML opcode from the input stream. 64 * 65 ******************************************************************************/ 66 67 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state) 68 { 69 70 ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state); 71 72 walk_state->aml_offset = 73 (u32)ACPI_PTR_DIFF(walk_state->parser_state.aml, 74 walk_state->parser_state.aml_start); 75 walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state)); 76 77 /* 78 * First cut to determine what we have found: 79 * 1) A valid AML opcode 80 * 2) A name string 81 * 3) An unknown/invalid opcode 82 */ 83 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode); 84 85 switch (walk_state->op_info->class) { 86 case AML_CLASS_ASCII: 87 case AML_CLASS_PREFIX: 88 /* 89 * Starts with a valid prefix or ASCII char, this is a name 90 * string. Convert the bare name string to a namepath. 91 */ 92 walk_state->opcode = AML_INT_NAMEPATH_OP; 93 walk_state->arg_types = ARGP_NAMESTRING; 94 break; 95 96 case AML_CLASS_UNKNOWN: 97 98 /* The opcode is unrecognized. Complain and skip unknown opcodes */ 99 100 if (walk_state->pass_number == 2) { 101 ACPI_ERROR((AE_INFO, 102 "Unknown opcode 0x%.2X at table offset 0x%.4X, ignoring", 103 walk_state->opcode, 104 (u32)(walk_state->aml_offset + 105 sizeof(struct acpi_table_header)))); 106 107 ACPI_DUMP_BUFFER((walk_state->parser_state.aml - 16), 108 48); 109 110 #ifdef ACPI_ASL_COMPILER 111 /* 112 * This is executed for the disassembler only. Output goes 113 * to the disassembled ASL output file. 114 */ 115 acpi_os_printf 116 ("/*\nError: Unknown opcode 0x%.2X at table offset 0x%.4X, context:\n", 117 walk_state->opcode, 118 (u32)(walk_state->aml_offset + 119 sizeof(struct acpi_table_header))); 120 121 /* Dump the context surrounding the invalid opcode */ 122 123 acpi_ut_dump_buffer(((u8 *)walk_state->parser_state. 124 aml - 16), 48, DB_BYTE_DISPLAY, 125 (walk_state->aml_offset + 126 sizeof(struct acpi_table_header) - 127 16)); 128 acpi_os_printf(" */\n"); 129 #endif 130 } 131 132 /* Increment past one-byte or two-byte opcode */ 133 134 walk_state->parser_state.aml++; 135 if (walk_state->opcode > 0xFF) { /* Can only happen if first byte is 0x5B */ 136 walk_state->parser_state.aml++; 137 } 138 139 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); 140 141 default: 142 143 /* Found opcode info, this is a normal opcode */ 144 145 walk_state->parser_state.aml += 146 acpi_ps_get_opcode_size(walk_state->opcode); 147 walk_state->arg_types = walk_state->op_info->parse_args; 148 break; 149 } 150 151 return_ACPI_STATUS(AE_OK); 152 } 153 154 /******************************************************************************* 155 * 156 * FUNCTION: acpi_ps_build_named_op 157 * 158 * PARAMETERS: walk_state - Current state 159 * aml_op_start - Begin of named Op in AML 160 * unnamed_op - Early Op (not a named Op) 161 * op - Returned Op 162 * 163 * RETURN: Status 164 * 165 * DESCRIPTION: Parse a named Op 166 * 167 ******************************************************************************/ 168 169 acpi_status 170 acpi_ps_build_named_op(struct acpi_walk_state *walk_state, 171 u8 *aml_op_start, 172 union acpi_parse_object *unnamed_op, 173 union acpi_parse_object **op) 174 { 175 acpi_status status = AE_OK; 176 union acpi_parse_object *arg = NULL; 177 178 ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state); 179 180 unnamed_op->common.value.arg = NULL; 181 unnamed_op->common.arg_list_length = 0; 182 unnamed_op->common.aml_opcode = walk_state->opcode; 183 184 /* 185 * Get and append arguments until we find the node that contains 186 * the name (the type ARGP_NAME). 187 */ 188 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) && 189 (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) { 190 status = 191 acpi_ps_get_next_arg(walk_state, 192 &(walk_state->parser_state), 193 GET_CURRENT_ARG_TYPE(walk_state-> 194 arg_types), &arg); 195 if (ACPI_FAILURE(status)) { 196 return_ACPI_STATUS(status); 197 } 198 199 acpi_ps_append_arg(unnamed_op, arg); 200 INCREMENT_ARG_LIST(walk_state->arg_types); 201 } 202 203 /* 204 * Make sure that we found a NAME and didn't run out of arguments 205 */ 206 if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) { 207 return_ACPI_STATUS(AE_AML_NO_OPERAND); 208 } 209 210 /* We know that this arg is a name, move to next arg */ 211 212 INCREMENT_ARG_LIST(walk_state->arg_types); 213 214 /* 215 * Find the object. This will either insert the object into 216 * the namespace or simply look it up 217 */ 218 walk_state->op = NULL; 219 220 status = walk_state->descending_callback(walk_state, op); 221 if (ACPI_FAILURE(status)) { 222 ACPI_EXCEPTION((AE_INFO, status, "During name lookup/catalog")); 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 return_ACPI_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 if ((*op)->common.aml_opcode == AML_REGION_OP || 241 (*op)->common.aml_opcode == AML_DATA_REGION_OP) { 242 /* 243 * Defer final parsing of an operation_region body, because we don't 244 * have enough info in the first pass to parse it correctly (i.e., 245 * there may be method calls within the term_arg elements of the body.) 246 * 247 * However, we must continue parsing because the opregion is not a 248 * standalone package -- we don't know where the end is at this point. 249 * 250 * (Length is unknown until parse of the body complete) 251 */ 252 (*op)->named.data = aml_op_start; 253 (*op)->named.length = 0; 254 } 255 256 return_ACPI_STATUS(AE_OK); 257 } 258 259 /******************************************************************************* 260 * 261 * FUNCTION: acpi_ps_create_op 262 * 263 * PARAMETERS: walk_state - Current state 264 * aml_op_start - Op start in AML 265 * new_op - Returned Op 266 * 267 * RETURN: Status 268 * 269 * DESCRIPTION: Get Op from AML 270 * 271 ******************************************************************************/ 272 273 acpi_status 274 acpi_ps_create_op(struct acpi_walk_state *walk_state, 275 u8 *aml_op_start, union acpi_parse_object **new_op) 276 { 277 acpi_status status = AE_OK; 278 union acpi_parse_object *op; 279 union acpi_parse_object *named_op = NULL; 280 union acpi_parse_object *parent_scope; 281 u8 argument_count; 282 const struct acpi_opcode_info *op_info; 283 284 ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state); 285 286 status = acpi_ps_get_aml_opcode(walk_state); 287 if (status == AE_CTRL_PARSE_CONTINUE) { 288 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE); 289 } 290 291 /* Create Op structure and append to parent's argument list */ 292 293 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode); 294 op = acpi_ps_alloc_op(walk_state->opcode); 295 if (!op) { 296 return_ACPI_STATUS(AE_NO_MEMORY); 297 } 298 299 if (walk_state->op_info->flags & AML_NAMED) { 300 status = 301 acpi_ps_build_named_op(walk_state, aml_op_start, op, 302 &named_op); 303 acpi_ps_free_op(op); 304 if (ACPI_FAILURE(status)) { 305 return_ACPI_STATUS(status); 306 } 307 308 *new_op = named_op; 309 return_ACPI_STATUS(AE_OK); 310 } 311 312 /* Not a named opcode, just allocate Op and append to parent */ 313 314 if (walk_state->op_info->flags & AML_CREATE) { 315 /* 316 * Backup to beginning of create_XXXfield declaration 317 * body_length is unknown until we parse the body 318 */ 319 op->named.data = aml_op_start; 320 op->named.length = 0; 321 } 322 323 if (walk_state->opcode == AML_BANK_FIELD_OP) { 324 /* 325 * Backup to beginning of bank_field declaration 326 * body_length is unknown until we parse the body 327 */ 328 op->named.data = aml_op_start; 329 op->named.length = 0; 330 } 331 332 parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state)); 333 acpi_ps_append_arg(parent_scope, op); 334 335 if (parent_scope) { 336 op_info = 337 acpi_ps_get_opcode_info(parent_scope->common.aml_opcode); 338 if (op_info->flags & AML_HAS_TARGET) { 339 argument_count = 340 acpi_ps_get_argument_count(op_info->type); 341 if (parent_scope->common.arg_list_length > 342 argument_count) { 343 op->common.flags |= ACPI_PARSEOP_TARGET; 344 } 345 } else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) { 346 op->common.flags |= ACPI_PARSEOP_TARGET; 347 } 348 } 349 350 if (walk_state->descending_callback != NULL) { 351 /* 352 * Find the object. This will either insert the object into 353 * the namespace or simply look it up 354 */ 355 walk_state->op = *new_op = op; 356 357 status = walk_state->descending_callback(walk_state, &op); 358 status = acpi_ps_next_parse_state(walk_state, op, status); 359 if (status == AE_CTRL_PENDING) { 360 status = AE_CTRL_PARSE_PENDING; 361 } 362 } 363 364 return_ACPI_STATUS(status); 365 } 366 367 /******************************************************************************* 368 * 369 * FUNCTION: acpi_ps_complete_op 370 * 371 * PARAMETERS: walk_state - Current state 372 * op - Returned Op 373 * status - Parse status before complete Op 374 * 375 * RETURN: Status 376 * 377 * DESCRIPTION: Complete Op 378 * 379 ******************************************************************************/ 380 381 acpi_status 382 acpi_ps_complete_op(struct acpi_walk_state *walk_state, 383 union acpi_parse_object **op, acpi_status status) 384 { 385 acpi_status status2; 386 387 ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state); 388 389 /* 390 * Finished one argument of the containing scope 391 */ 392 walk_state->parser_state.scope->parse_scope.arg_count--; 393 394 /* Close this Op (will result in parse subtree deletion) */ 395 396 status2 = acpi_ps_complete_this_op(walk_state, *op); 397 if (ACPI_FAILURE(status2)) { 398 return_ACPI_STATUS(status2); 399 } 400 401 *op = NULL; 402 403 switch (status) { 404 case AE_OK: 405 406 break; 407 408 case AE_CTRL_TRANSFER: 409 410 /* We are about to transfer to a called method */ 411 412 walk_state->prev_op = NULL; 413 walk_state->prev_arg_types = walk_state->arg_types; 414 return_ACPI_STATUS(status); 415 416 case AE_CTRL_END: 417 418 acpi_ps_pop_scope(&(walk_state->parser_state), op, 419 &walk_state->arg_types, 420 &walk_state->arg_count); 421 422 if (*op) { 423 walk_state->op = *op; 424 walk_state->op_info = 425 acpi_ps_get_opcode_info((*op)->common.aml_opcode); 426 walk_state->opcode = (*op)->common.aml_opcode; 427 428 status = walk_state->ascending_callback(walk_state); 429 status = 430 acpi_ps_next_parse_state(walk_state, *op, status); 431 432 status2 = acpi_ps_complete_this_op(walk_state, *op); 433 if (ACPI_FAILURE(status2)) { 434 return_ACPI_STATUS(status2); 435 } 436 } 437 438 status = AE_OK; 439 break; 440 441 case AE_CTRL_BREAK: 442 case AE_CTRL_CONTINUE: 443 444 /* Pop off scopes until we find the While */ 445 446 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) { 447 acpi_ps_pop_scope(&(walk_state->parser_state), op, 448 &walk_state->arg_types, 449 &walk_state->arg_count); 450 } 451 452 /* Close this iteration of the While loop */ 453 454 walk_state->op = *op; 455 walk_state->op_info = 456 acpi_ps_get_opcode_info((*op)->common.aml_opcode); 457 walk_state->opcode = (*op)->common.aml_opcode; 458 459 status = walk_state->ascending_callback(walk_state); 460 status = acpi_ps_next_parse_state(walk_state, *op, status); 461 462 status2 = acpi_ps_complete_this_op(walk_state, *op); 463 if (ACPI_FAILURE(status2)) { 464 return_ACPI_STATUS(status2); 465 } 466 467 status = AE_OK; 468 break; 469 470 case AE_CTRL_TERMINATE: 471 472 /* Clean up */ 473 do { 474 if (*op) { 475 status2 = 476 acpi_ps_complete_this_op(walk_state, *op); 477 if (ACPI_FAILURE(status2)) { 478 return_ACPI_STATUS(status2); 479 } 480 481 acpi_ut_delete_generic_state 482 (acpi_ut_pop_generic_state 483 (&walk_state->control_state)); 484 } 485 486 acpi_ps_pop_scope(&(walk_state->parser_state), op, 487 &walk_state->arg_types, 488 &walk_state->arg_count); 489 490 } while (*op); 491 492 return_ACPI_STATUS(AE_OK); 493 494 default: /* All other non-AE_OK status */ 495 496 do { 497 if (*op) { 498 status2 = 499 acpi_ps_complete_this_op(walk_state, *op); 500 if (ACPI_FAILURE(status2)) { 501 return_ACPI_STATUS(status2); 502 } 503 } 504 505 acpi_ps_pop_scope(&(walk_state->parser_state), op, 506 &walk_state->arg_types, 507 &walk_state->arg_count); 508 509 } while (*op); 510 511 #if 0 512 /* 513 * TBD: Cleanup parse ops on error 514 */ 515 if (*op == NULL) { 516 acpi_ps_pop_scope(parser_state, op, 517 &walk_state->arg_types, 518 &walk_state->arg_count); 519 } 520 #endif 521 walk_state->prev_op = NULL; 522 walk_state->prev_arg_types = walk_state->arg_types; 523 return_ACPI_STATUS(status); 524 } 525 526 /* This scope complete? */ 527 528 if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) { 529 acpi_ps_pop_scope(&(walk_state->parser_state), op, 530 &walk_state->arg_types, 531 &walk_state->arg_count); 532 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op)); 533 } else { 534 *op = NULL; 535 } 536 537 return_ACPI_STATUS(AE_OK); 538 } 539 540 /******************************************************************************* 541 * 542 * FUNCTION: acpi_ps_complete_final_op 543 * 544 * PARAMETERS: walk_state - Current state 545 * op - Current Op 546 * status - Current parse status before complete last 547 * Op 548 * 549 * RETURN: Status 550 * 551 * DESCRIPTION: Complete last Op. 552 * 553 ******************************************************************************/ 554 555 acpi_status 556 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state, 557 union acpi_parse_object *op, acpi_status status) 558 { 559 acpi_status status2; 560 561 ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state); 562 563 /* 564 * Complete the last Op (if not completed), and clear the scope stack. 565 * It is easily possible to end an AML "package" with an unbounded number 566 * of open scopes (such as when several ASL blocks are closed with 567 * sequential closing braces). We want to terminate each one cleanly. 568 */ 569 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n", 570 op)); 571 do { 572 if (op) { 573 if (walk_state->ascending_callback != NULL) { 574 walk_state->op = op; 575 walk_state->op_info = 576 acpi_ps_get_opcode_info(op->common. 577 aml_opcode); 578 walk_state->opcode = op->common.aml_opcode; 579 580 status = 581 walk_state->ascending_callback(walk_state); 582 status = 583 acpi_ps_next_parse_state(walk_state, op, 584 status); 585 if (status == AE_CTRL_PENDING) { 586 status = 587 acpi_ps_complete_op(walk_state, &op, 588 AE_OK); 589 if (ACPI_FAILURE(status)) { 590 return_ACPI_STATUS(status); 591 } 592 } 593 594 if (status == AE_CTRL_TERMINATE) { 595 status = AE_OK; 596 597 /* Clean up */ 598 do { 599 if (op) { 600 status2 = 601 acpi_ps_complete_this_op 602 (walk_state, op); 603 if (ACPI_FAILURE 604 (status2)) { 605 return_ACPI_STATUS 606 (status2); 607 } 608 } 609 610 acpi_ps_pop_scope(& 611 (walk_state-> 612 parser_state), 613 &op, 614 &walk_state-> 615 arg_types, 616 &walk_state-> 617 arg_count); 618 619 } while (op); 620 621 return_ACPI_STATUS(status); 622 } 623 624 else if (ACPI_FAILURE(status)) { 625 626 /* First error is most important */ 627 628 (void) 629 acpi_ps_complete_this_op(walk_state, 630 op); 631 return_ACPI_STATUS(status); 632 } 633 } 634 635 status2 = acpi_ps_complete_this_op(walk_state, op); 636 if (ACPI_FAILURE(status2)) { 637 return_ACPI_STATUS(status2); 638 } 639 } 640 641 acpi_ps_pop_scope(&(walk_state->parser_state), &op, 642 &walk_state->arg_types, 643 &walk_state->arg_count); 644 645 } while (op); 646 647 return_ACPI_STATUS(status); 648 } 649