drivers/acpi/acpica/psloop.c

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