drivers/acpi/acpica/dswexec.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: dswexec - Dispatcher method execution callbacks;
   5  *                        dispatch to interpreter.
   6  *
   7  * Copyright (C) 2000 - 2019, Intel Corp.
   8  *
   9  *****************************************************************************/
  10
  11 #include <acpi/acpi.h>
  12 #include "accommon.h"
  13 #include "acparser.h"
  14 #include "amlcode.h"
  15 #include "acdispat.h"
  16 #include "acinterp.h"
  17 #include "acnamesp.h"
  18 #include "acdebug.h"
  19
  20 #define _COMPONENT          ACPI_DISPATCHER
  21 ACPI_MODULE_NAME("dswexec")
  22
  23 /*
  24  * Dispatch table for opcode classes
  25  */
  26 static acpi_execute_op acpi_gbl_op_type_dispatch[] = {
  27         acpi_ex_opcode_0A_0T_1R,
  28         acpi_ex_opcode_1A_0T_0R,
  29         acpi_ex_opcode_1A_0T_1R,
  30         acpi_ex_opcode_1A_1T_0R,
  31         acpi_ex_opcode_1A_1T_1R,
  32         acpi_ex_opcode_2A_0T_0R,
  33         acpi_ex_opcode_2A_0T_1R,
  34         acpi_ex_opcode_2A_1T_1R,
  35         acpi_ex_opcode_2A_2T_1R,
  36         acpi_ex_opcode_3A_0T_0R,
  37         acpi_ex_opcode_3A_1T_1R,
  38         acpi_ex_opcode_6A_0T_1R
  39 };
  40
  41 /*****************************************************************************
  42  *
  43  * FUNCTION:    acpi_ds_get_predicate_value
  44  *
  45  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  46  *              result_obj      - if non-zero, pop result from result stack
  47  *
  48  * RETURN:      Status
  49  *
  50  * DESCRIPTION: Get the result of a predicate evaluation
  51  *
  52  ****************************************************************************/
  53
  54 acpi_status
  55 acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
  56                             union acpi_operand_object *result_obj)
  57 {
  58         acpi_status status = AE_OK;
  59         union acpi_operand_object *obj_desc;
  60         union acpi_operand_object *local_obj_desc = NULL;
  61
  62         ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
  63
  64         walk_state->control_state->common.state = 0;
  65
  66         if (result_obj) {
  67                 status = acpi_ds_result_pop(&obj_desc, walk_state);
  68                 if (ACPI_FAILURE(status)) {
  69                         ACPI_EXCEPTION((AE_INFO, status,
  70                                         "Could not get result from predicate evaluation"));
  71
  72                         return_ACPI_STATUS(status);
  73                 }
  74         } else {
  75                 status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
  76                 if (ACPI_FAILURE(status)) {
  77                         return_ACPI_STATUS(status);
  78                 }
  79
  80                 status =
  81                     acpi_ex_resolve_to_value(&walk_state->operands[0],
  82                                              walk_state);
  83                 if (ACPI_FAILURE(status)) {
  84                         return_ACPI_STATUS(status);
  85                 }
  86
  87                 obj_desc = walk_state->operands[0];
  88         }
  89
  90         if (!obj_desc) {
  91                 ACPI_ERROR((AE_INFO,
  92                             "No predicate ObjDesc=%p State=%p",
  93                             obj_desc, walk_state));
  94
  95                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
  96         }
  97
  98         /*
  99          * Result of predicate evaluation must be an Integer
 100          * object. Implicitly convert the argument if necessary.
 101          */
 102         status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc,
 103                                             ACPI_IMPLICIT_CONVERSION);
 104         if (ACPI_FAILURE(status)) {
 105                 goto cleanup;
 106         }
 107
 108         if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
 109                 ACPI_ERROR((AE_INFO,
 110                             "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
 111                             obj_desc, walk_state, obj_desc->common.type));
 112
 113                 status = AE_AML_OPERAND_TYPE;
 114                 goto cleanup;
 115         }
 116
 117         /* Truncate the predicate to 32-bits if necessary */
 118
 119         (void)acpi_ex_truncate_for32bit_table(local_obj_desc);
 120
 121         /*
 122          * Save the result of the predicate evaluation on
 123          * the control stack
 124          */
 125         if (local_obj_desc->integer.value) {
 126                 walk_state->control_state->common.value = TRUE;
 127         } else {
 128                 /*
 129                  * Predicate is FALSE, we will just toss the
 130                  * rest of the package
 131                  */
 132                 walk_state->control_state->common.value = FALSE;
 133                 status = AE_CTRL_FALSE;
 134         }
 135
 136         /* Predicate can be used for an implicit return value */
 137
 138         (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
 139
 140 cleanup:
 141
 142         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 143                           "Completed a predicate eval=%X Op=%p\n",
 144                           walk_state->control_state->common.value,
 145                           walk_state->op));
 146
 147         /* Break to debugger to display result */
 148
 149         acpi_db_display_result_object(local_obj_desc, walk_state);
 150
 151         /*
 152          * Delete the predicate result object (we know that
 153          * we don't need it anymore)
 154          */
 155         if (local_obj_desc != obj_desc) {
 156                 acpi_ut_remove_reference(local_obj_desc);
 157         }
 158         acpi_ut_remove_reference(obj_desc);
 159
 160         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
 161         return_ACPI_STATUS(status);
 162 }
 163
 164 /*****************************************************************************
 165  *
 166  * FUNCTION:    acpi_ds_exec_begin_op
 167  *
 168  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 169  *              out_op          - Where to return op if a new one is created
 170  *
 171  * RETURN:      Status
 172  *
 173  * DESCRIPTION: Descending callback used during the execution of control
 174  *              methods. This is where most operators and operands are
 175  *              dispatched to the interpreter.
 176  *
 177  ****************************************************************************/
 178
 179 acpi_status
 180 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
 181                       union acpi_parse_object **out_op)
 182 {
 183         union acpi_parse_object *op;
 184         acpi_status status = AE_OK;
 185         u32 opcode_class;
 186
 187         ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
 188
 189         op = walk_state->op;
 190         if (!op) {
 191                 status = acpi_ds_load2_begin_op(walk_state, out_op);
 192                 if (ACPI_FAILURE(status)) {
 193                         goto error_exit;
 194                 }
 195
 196                 op = *out_op;
 197                 walk_state->op = op;
 198                 walk_state->opcode = op->common.aml_opcode;
 199                 walk_state->op_info =
 200                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 201
 202                 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
 203                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 204                                           "(%s) Popping scope for Op %p\n",
 205                                           acpi_ut_get_type_name(walk_state->
 206                                                                 op_info->
 207                                                                 object_type),
 208                                           op));
 209
 210                         status = acpi_ds_scope_stack_pop(walk_state);
 211                         if (ACPI_FAILURE(status)) {
 212                                 goto error_exit;
 213                         }
 214                 }
 215         }
 216
 217         if (op == walk_state->origin) {
 218                 if (out_op) {
 219                         *out_op = op;
 220                 }
 221
 222                 return_ACPI_STATUS(AE_OK);
 223         }
 224
 225         /*
 226          * If the previous opcode was a conditional, this opcode
 227          * must be the beginning of the associated predicate.
 228          * Save this knowledge in the current scope descriptor
 229          */
 230         if ((walk_state->control_state) &&
 231             (walk_state->control_state->common.state ==
 232              ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 233                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 234                                   "Exec predicate Op=%p State=%p\n",
 235                                   op, walk_state));
 236
 237                 walk_state->control_state->common.state =
 238                     ACPI_CONTROL_PREDICATE_EXECUTING;
 239
 240                 /* Save start of predicate */
 241
 242                 walk_state->control_state->control.predicate_op = op;
 243         }
 244
 245         opcode_class = walk_state->op_info->class;
 246
 247         /* We want to send namepaths to the load code */
 248
 249         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 250                 opcode_class = AML_CLASS_NAMED_OBJECT;
 251         }
 252
 253         /*
 254          * Handle the opcode based upon the opcode type
 255          */
 256         switch (opcode_class) {
 257         case AML_CLASS_CONTROL:
 258
 259                 status = acpi_ds_exec_begin_control_op(walk_state, op);
 260                 break;
 261
 262         case AML_CLASS_NAMED_OBJECT:
 263
 264                 if (walk_state->walk_type & ACPI_WALK_METHOD) {
 265                         /*
 266                          * Found a named object declaration during method execution;
 267                          * we must enter this object into the namespace. The created
 268                          * object is temporary and will be deleted upon completion of
 269                          * the execution of this method.
 270                          *
 271                          * Note 10/2010: Except for the Scope() op. This opcode does
 272                          * not actually create a new object, it refers to an existing
 273                          * object. However, for Scope(), we want to indeed open a
 274                          * new scope.
 275                          */
 276                         if (op->common.aml_opcode != AML_SCOPE_OP) {
 277                                 status =
 278                                     acpi_ds_load2_begin_op(walk_state, NULL);
 279                         } else {
 280                                 status =
 281                                     acpi_ds_scope_stack_push(op->named.node,
 282                                                              op->named.node->
 283                                                              type, walk_state);
 284                                 if (ACPI_FAILURE(status)) {
 285                                         return_ACPI_STATUS(status);
 286                                 }
 287                         }
 288                 }
 289                 break;
 290
 291         case AML_CLASS_EXECUTE:
 292         case AML_CLASS_CREATE:
 293
 294                 break;
 295
 296         default:
 297
 298                 break;
 299         }
 300
 301         /* Nothing to do here during method execution */
 302
 303         return_ACPI_STATUS(status);
 304
 305 error_exit:
 306         status = acpi_ds_method_error(status, walk_state);
 307         return_ACPI_STATUS(status);
 308 }
 309
 310 /*****************************************************************************
 311  *
 312  * FUNCTION:    acpi_ds_exec_end_op
 313  *
 314  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 315  *
 316  * RETURN:      Status
 317  *
 318  * DESCRIPTION: Ascending callback used during the execution of control
 319  *              methods. The only thing we really need to do here is to
 320  *              notice the beginning of IF, ELSE, and WHILE blocks.
 321  *
 322  ****************************************************************************/
 323
 324 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 325 {
 326         union acpi_parse_object *op;
 327         acpi_status status = AE_OK;
 328         u32 op_type;
 329         u32 op_class;
 330         union acpi_parse_object *next_op;
 331         union acpi_parse_object *first_arg;
 332
 333         ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
 334
 335         op = walk_state->op;
 336         op_type = walk_state->op_info->type;
 337         op_class = walk_state->op_info->class;
 338
 339         if (op_class == AML_CLASS_UNKNOWN) {
 340                 ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
 341                             op->common.aml_opcode));
 342                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 343         }
 344
 345         first_arg = op->common.value.arg;
 346
 347         /* Init the walk state */
 348
 349         walk_state->num_operands = 0;
 350         walk_state->operand_index = 0;
 351         walk_state->return_desc = NULL;
 352         walk_state->result_obj = NULL;
 353
 354         /* Call debugger for single step support (DEBUG build only) */
 355
 356         status = acpi_db_single_step(walk_state, op, op_class);
 357         if (ACPI_FAILURE(status)) {
 358                 return_ACPI_STATUS(status);
 359         }
 360
 361         /* Decode the Opcode Class */
 362
 363         switch (op_class) {
 364         case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */
 365
 366                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 367                         status = acpi_ds_evaluate_name_path(walk_state);
 368                         if (ACPI_FAILURE(status)) {
 369                                 goto cleanup;
 370                         }
 371                 }
 372                 break;
 373
 374         case AML_CLASS_EXECUTE: /* Most operators with arguments */
 375
 376                 /* Build resolved operand stack */
 377
 378                 status = acpi_ds_create_operands(walk_state, first_arg);
 379                 if (ACPI_FAILURE(status)) {
 380                         goto cleanup;
 381                 }
 382
 383                 /*
 384                  * All opcodes require operand resolution, with the only exceptions
 385                  * being the object_type and size_of operators.
 386                  */
 387                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
 388
 389                         /* Resolve all operands */
 390
 391                         status = acpi_ex_resolve_operands(walk_state->opcode,
 392                                                           &(walk_state->
 393                                                             operands
 394                                                             [walk_state->
 395                                                              num_operands - 1]),
 396                                                           walk_state);
 397                 }
 398
 399                 if (ACPI_SUCCESS(status)) {
 400                         /*
 401                          * Dispatch the request to the appropriate interpreter handler
 402                          * routine. There is one routine per opcode "type" based upon the
 403                          * number of opcode arguments and return type.
 404                          */
 405                         status =
 406                             acpi_gbl_op_type_dispatch[op_type] (walk_state);
 407                 } else {
 408                         /*
 409                          * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
 410                          * Local is uninitialized.
 411                          */
 412                         if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 413                             (walk_state->opcode == AML_STORE_OP) &&
 414                             (walk_state->operands[0]->common.type ==
 415                              ACPI_TYPE_LOCAL_REFERENCE)
 416                             && (walk_state->operands[1]->common.type ==
 417                                 ACPI_TYPE_LOCAL_REFERENCE)
 418                             && (walk_state->operands[0]->reference.class ==
 419                                 walk_state->operands[1]->reference.class)
 420                             && (walk_state->operands[0]->reference.value ==
 421                                 walk_state->operands[1]->reference.value)) {
 422                                 status = AE_OK;
 423                         } else {
 424                                 ACPI_EXCEPTION((AE_INFO, status,
 425                                                 "While resolving operands for [%s]",
 426                                                 acpi_ps_get_opcode_name
 427                                                 (walk_state->opcode)));
 428                         }
 429                 }
 430
 431                 /* Always delete the argument objects and clear the operand stack */
 432
 433                 acpi_ds_clear_operands(walk_state);
 434
 435                 /*
 436                  * If a result object was returned from above, push it on the
 437                  * current result stack
 438                  */
 439                 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
 440                         status =
 441                             acpi_ds_result_push(walk_state->result_obj,
 442                                                 walk_state);
 443                 }
 444                 break;
 445
 446         default:
 447
 448                 switch (op_type) {
 449                 case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 450
 451                         /* 1 Operand, 0 external_result, 0 internal_result */
 452
 453                         status = acpi_ds_exec_end_control_op(walk_state, op);
 454
 455                         break;
 456
 457                 case AML_TYPE_METHOD_CALL:
 458                         /*
 459                          * If the method is referenced from within a package
 460                          * declaration, it is not a invocation of the method, just
 461                          * a reference to it.
 462                          */
 463                         if ((op->asl.parent) &&
 464                             ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
 465                              || (op->asl.parent->asl.aml_opcode ==
 466                                  AML_VARIABLE_PACKAGE_OP))) {
 467                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 468                                                   "Method Reference in a Package, Op=%p\n",
 469                                                   op));
 470
 471                                 op->common.node = (struct acpi_namespace_node *)
 472                                     op->asl.value.arg->asl.node;
 473                                 acpi_ut_add_reference(op->asl.value.arg->asl.
 474                                                       node->object);
 475                                 return_ACPI_STATUS(AE_OK);
 476                         }
 477
 478                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 479                                           "Method invocation, Op=%p\n", op));
 480
 481                         /*
 482                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
 483                          * the method Node pointer
 484                          */
 485                         /* next_op points to the op that holds the method name */
 486
 487                         next_op = first_arg;
 488
 489                         /* next_op points to first argument op */
 490
 491                         next_op = next_op->common.next;
 492
 493                         /*
 494                          * Get the method's arguments and put them on the operand stack
 495                          */
 496                         status = acpi_ds_create_operands(walk_state, next_op);
 497                         if (ACPI_FAILURE(status)) {
 498                                 break;
 499                         }
 500
 501                         /*
 502                          * Since the operands will be passed to another control method,
 503                          * we must resolve all local references here (Local variables,
 504                          * arguments to *this* method, etc.)
 505                          */
 506                         status = acpi_ds_resolve_operands(walk_state);
 507                         if (ACPI_FAILURE(status)) {
 508
 509                                 /* On error, clear all resolved operands */
 510
 511                                 acpi_ds_clear_operands(walk_state);
 512                                 break;
 513                         }
 514
 515                         /*
 516                          * Tell the walk loop to preempt this running method and
 517                          * execute the new method
 518                          */
 519                         status = AE_CTRL_TRANSFER;
 520
 521                         /*
 522                          * Return now; we don't want to disturb anything,
 523                          * especially the operand count!
 524                          */
 525                         return_ACPI_STATUS(status);
 526
 527                 case AML_TYPE_CREATE_FIELD:
 528
 529                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 530                                           "Executing CreateField Buffer/Index Op=%p\n",
 531                                           op));
 532
 533                         status = acpi_ds_load2_end_op(walk_state);
 534                         if (ACPI_FAILURE(status)) {
 535                                 break;
 536                         }
 537
 538                         status =
 539                             acpi_ds_eval_buffer_field_operands(walk_state, op);
 540                         break;
 541
 542                 case AML_TYPE_CREATE_OBJECT:
 543
 544                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 545                                           "Executing CreateObject (Buffer/Package) Op=%p Child=%p ParentOpcode=%4.4X\n",
 546                                           op, op->named.value.arg,
 547                                           op->common.parent->common.
 548                                           aml_opcode));
 549
 550                         switch (op->common.parent->common.aml_opcode) {
 551                         case AML_NAME_OP:
 552                                 /*
 553                                  * Put the Node on the object stack (Contains the ACPI Name
 554                                  * of this object)
 555                                  */
 556                                 walk_state->operands[0] = (void *)
 557                                     op->common.parent->common.node;
 558                                 walk_state->num_operands = 1;
 559
 560                                 status = acpi_ds_create_node(walk_state,
 561                                                              op->common.parent->
 562                                                              common.node,
 563                                                              op->common.parent);
 564                                 if (ACPI_FAILURE(status)) {
 565                                         break;
 566                                 }
 567
 568                                 /* Fall through */
 569                                 /*lint -fallthrough */
 570
 571                         case AML_INT_EVAL_SUBTREE_OP:
 572
 573                                 status =
 574                                     acpi_ds_eval_data_object_operands
 575                                     (walk_state, op,
 576                                      acpi_ns_get_attached_object(op->common.
 577                                                                  parent->common.
 578                                                                  node));
 579                                 break;
 580
 581                         default:
 582
 583                                 status =
 584                                     acpi_ds_eval_data_object_operands
 585                                     (walk_state, op, NULL);
 586                                 break;
 587                         }
 588
 589                         /*
 590                          * If a result object was returned from above, push it on the
 591                          * current result stack
 592                          */
 593                         if (walk_state->result_obj) {
 594                                 status =
 595                                     acpi_ds_result_push(walk_state->result_obj,
 596                                                         walk_state);
 597                         }
 598                         break;
 599
 600                 case AML_TYPE_NAMED_FIELD:
 601                 case AML_TYPE_NAMED_COMPLEX:
 602                 case AML_TYPE_NAMED_SIMPLE:
 603                 case AML_TYPE_NAMED_NO_OBJ:
 604
 605                         status = acpi_ds_load2_end_op(walk_state);
 606                         if (ACPI_FAILURE(status)) {
 607                                 break;
 608                         }
 609
 610                         if (op->common.aml_opcode == AML_REGION_OP) {
 611                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 612                                                   "Executing OpRegion Address/Length Op=%p\n",
 613                                                   op));
 614
 615                                 status =
 616                                     acpi_ds_eval_region_operands(walk_state,
 617                                                                  op);
 618                                 if (ACPI_FAILURE(status)) {
 619                                         break;
 620                                 }
 621                         } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 622                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 623                                                   "Executing DataTableRegion Strings Op=%p\n",
 624                                                   op));
 625
 626                                 status =
 627                                     acpi_ds_eval_table_region_operands
 628                                     (walk_state, op);
 629                                 if (ACPI_FAILURE(status)) {
 630                                         break;
 631                                 }
 632                         } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
 633                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 634                                                   "Executing BankField Op=%p\n",
 635                                                   op));
 636
 637                                 status =
 638                                     acpi_ds_eval_bank_field_operands(walk_state,
 639                                                                      op);
 640                                 if (ACPI_FAILURE(status)) {
 641                                         break;
 642                                 }
 643                         }
 644                         break;
 645
 646                 case AML_TYPE_UNDEFINED:
 647
 648                         ACPI_ERROR((AE_INFO,
 649                                     "Undefined opcode type Op=%p", op));
 650                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 651
 652                 case AML_TYPE_BOGUS:
 653
 654                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 655                                           "Internal opcode=%X type Op=%p\n",
 656                                           walk_state->opcode, op));
 657                         break;
 658
 659                 default:
 660
 661                         ACPI_ERROR((AE_INFO,
 662                                     "Unimplemented opcode, class=0x%X "
 663                                     "type=0x%X Opcode=0x%X Op=%p",
 664                                     op_class, op_type, op->common.aml_opcode,
 665                                     op));
 666
 667                         status = AE_NOT_IMPLEMENTED;
 668                         break;
 669                 }
 670         }
 671
 672         /*
 673          * ACPI 2.0 support for 64-bit integers: Truncate numeric
 674          * result value if we are executing from a 32-bit ACPI table
 675          */
 676         (void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);
 677
 678         /*
 679          * Check if we just completed the evaluation of a
 680          * conditional predicate
 681          */
 682         if ((ACPI_SUCCESS(status)) &&
 683             (walk_state->control_state) &&
 684             (walk_state->control_state->common.state ==
 685              ACPI_CONTROL_PREDICATE_EXECUTING) &&
 686             (walk_state->control_state->control.predicate_op == op)) {
 687                 status =
 688                     acpi_ds_get_predicate_value(walk_state,
 689                                                 walk_state->result_obj);
 690                 walk_state->result_obj = NULL;
 691         }
 692
 693 cleanup:
 694
 695         if (walk_state->result_obj) {
 696
 697                 /* Break to debugger to display result */
 698
 699                 acpi_db_display_result_object(walk_state->result_obj,
 700                                               walk_state);
 701
 702                 /*
 703                  * Delete the result op if and only if:
 704                  * Parent will not use the result -- such as any
 705                  * non-nested type2 op in a method (parent will be method)
 706                  */
 707                 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
 708                                                   walk_state);
 709         }
 710 #ifdef _UNDER_DEVELOPMENT
 711
 712         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
 713                 acpi_db_method_end(walk_state);
 714         }
 715 #endif
 716
 717         /* Invoke exception handler on error */
 718
 719         if (ACPI_FAILURE(status)) {
 720                 status = acpi_ds_method_error(status, walk_state);
 721         }
 722
 723         /* Always clear the object stack */
 724
 725         walk_state->num_operands = 0;
 726         return_ACPI_STATUS(status);
 727 }