LXR linux/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 - 2021, 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#ifdef ACPI_EXEC_APP
  20#include "aecommon.h"
  21#endif
  22
  23#define _COMPONENT          ACPI_DISPATCHER
  24ACPI_MODULE_NAME("dswexec")
  25
  26/*
  27 * Dispatch table for opcode classes
  28 */
  29static acpi_execute_op acpi_gbl_op_type_dispatch[] = {
  30        acpi_ex_opcode_0A_0T_1R,
  31        acpi_ex_opcode_1A_0T_0R,
  32        acpi_ex_opcode_1A_0T_1R,
  33        acpi_ex_opcode_1A_1T_0R,
  34        acpi_ex_opcode_1A_1T_1R,
  35        acpi_ex_opcode_2A_0T_0R,
  36        acpi_ex_opcode_2A_0T_1R,
  37        acpi_ex_opcode_2A_1T_1R,
  38        acpi_ex_opcode_2A_2T_1R,
  39        acpi_ex_opcode_3A_0T_0R,
  40        acpi_ex_opcode_3A_1T_1R,
  41        acpi_ex_opcode_6A_0T_1R
  42};
  43
  44/*****************************************************************************
  45 *
  46 * FUNCTION:    acpi_ds_get_predicate_value
  47 *
  48 * PARAMETERS:  walk_state      - Current state of the parse tree walk
  49 *              result_obj      - if non-zero, pop result from result stack
  50 *
  51 * RETURN:      Status
  52 *
  53 * DESCRIPTION: Get the result of a predicate evaluation
  54 *
  55 ****************************************************************************/
  56
  57acpi_status
  58acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
  59                            union acpi_operand_object *result_obj)
  60{
  61        acpi_status status = AE_OK;
  62        union acpi_operand_object *obj_desc;
  63        union acpi_operand_object *local_obj_desc = NULL;
  64
  65        ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
  66
  67        walk_state->control_state->common.state = 0;
  68
  69        if (result_obj) {
  70                status = acpi_ds_result_pop(&obj_desc, walk_state);
  71                if (ACPI_FAILURE(status)) {
  72                        ACPI_EXCEPTION((AE_INFO, status,
  73                                        "Could not get result from predicate evaluation"));
  74
  75                        return_ACPI_STATUS(status);
  76                }
  77        } else {
  78                status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
  79                if (ACPI_FAILURE(status)) {
  80                        return_ACPI_STATUS(status);
  81                }
  82
  83                status =
  84                    acpi_ex_resolve_to_value(&walk_state->operands[0],
  85                                             walk_state);
  86                if (ACPI_FAILURE(status)) {
  87                        return_ACPI_STATUS(status);
  88                }
  89
  90                obj_desc = walk_state->operands[0];
  91        }
  92
  93        if (!obj_desc) {
  94                ACPI_ERROR((AE_INFO,
  95                            "No predicate ObjDesc=%p State=%p",
  96                            obj_desc, walk_state));
  97
  98                return_ACPI_STATUS(AE_AML_NO_OPERAND);
  99        }
 100
 101        /*
 102         * Result of predicate evaluation must be an Integer
 103         * object. Implicitly convert the argument if necessary.
 104         */
 105        status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc,
 106                                            ACPI_IMPLICIT_CONVERSION);
 107        if (ACPI_FAILURE(status)) {
 108                goto cleanup;
 109        }
 110
 111        if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
 112                ACPI_ERROR((AE_INFO,
 113                            "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
 114                            obj_desc, walk_state, obj_desc->common.type));
 115
 116                status = AE_AML_OPERAND_TYPE;
 117                goto cleanup;
 118        }
 119
 120        /* Truncate the predicate to 32-bits if necessary */
 121
 122        (void)acpi_ex_truncate_for32bit_table(local_obj_desc);
 123
 124        /*
 125         * Save the result of the predicate evaluation on
 126         * the control stack
 127         */
 128        if (local_obj_desc->integer.value) {
 129                walk_state->control_state->common.value = TRUE;
 130        } else {
 131                /*
 132                 * Predicate is FALSE, we will just toss the
 133                 * rest of the package
 134                 */
 135                walk_state->control_state->common.value = FALSE;
 136                status = AE_CTRL_FALSE;
 137        }
 138
 139        /* Predicate can be used for an implicit return value */
 140
 141        (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
 142
 143cleanup:
 144
 145        ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 146                          "Completed a predicate eval=%X Op=%p\n",
 147                          walk_state->control_state->common.value,
 148                          walk_state->op));
 149
 150        /* Break to debugger to display result */
 151
 152        acpi_db_display_result_object(local_obj_desc, walk_state);
 153
 154        /*
 155         * Delete the predicate result object (we know that
 156         * we don't need it anymore)
 157         */
 158        if (local_obj_desc != obj_desc) {
 159                acpi_ut_remove_reference(local_obj_desc);
 160        }
 161        acpi_ut_remove_reference(obj_desc);
 162
 163        walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
 164        return_ACPI_STATUS(status);
 165}
 166
 167/*****************************************************************************
 168 *
 169 * FUNCTION:    acpi_ds_exec_begin_op
 170 *
 171 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 172 *              out_op          - Where to return op if a new one is created
 173 *
 174 * RETURN:      Status
 175 *
 176 * DESCRIPTION: Descending callback used during the execution of control
 177 *              methods. This is where most operators and operands are
 178 *              dispatched to the interpreter.
 179 *
 180 ****************************************************************************/
 181
 182acpi_status
 183acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
 184                      union acpi_parse_object **out_op)
 185{
 186        union acpi_parse_object *op;
 187        acpi_status status = AE_OK;
 188        u32 opcode_class;
 189
 190        ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
 191
 192        op = walk_state->op;
 193        if (!op) {
 194                status = acpi_ds_load2_begin_op(walk_state, out_op);
 195                if (ACPI_FAILURE(status)) {
 196                        goto error_exit;
 197                }
 198
 199                op = *out_op;
 200                walk_state->op = op;
 201                walk_state->opcode = op->common.aml_opcode;
 202                walk_state->op_info =
 203                    acpi_ps_get_opcode_info(op->common.aml_opcode);
 204
 205                if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
 206                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 207                                          "(%s) Popping scope for Op %p\n",
 208                                          acpi_ut_get_type_name(walk_state->
 209                                                                op_info->
 210                                                                object_type),
 211                                          op));
 212
 213                        status = acpi_ds_scope_stack_pop(walk_state);
 214                        if (ACPI_FAILURE(status)) {
 215                                goto error_exit;
 216                        }
 217                }
 218        }
 219
 220        if (op == walk_state->origin) {
 221                if (out_op) {
 222                        *out_op = op;
 223                }
 224
 225                return_ACPI_STATUS(AE_OK);
 226        }
 227
 228        /*
 229         * If the previous opcode was a conditional, this opcode
 230         * must be the beginning of the associated predicate.
 231         * Save this knowledge in the current scope descriptor
 232         */
 233        if ((walk_state->control_state) &&
 234            (walk_state->control_state->common.state ==
 235             ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 236                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 237                                  "Exec predicate Op=%p State=%p\n",
 238                                  op, walk_state));
 239
 240                walk_state->control_state->common.state =
 241                    ACPI_CONTROL_PREDICATE_EXECUTING;
 242
 243                /* Save start of predicate */
 244
 245                walk_state->control_state->control.predicate_op = op;
 246        }
 247
 248        opcode_class = walk_state->op_info->class;
 249
 250        /* We want to send namepaths to the load code */
 251
 252        if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 253                opcode_class = AML_CLASS_NAMED_OBJECT;
 254        }
 255
 256        /*
 257         * Handle the opcode based upon the opcode type
 258         */
 259        switch (opcode_class) {
 260        case AML_CLASS_CONTROL:
 261
 262                status = acpi_ds_exec_begin_control_op(walk_state, op);
 263                break;
 264
 265        case AML_CLASS_NAMED_OBJECT:
 266
 267                if (walk_state->walk_type & ACPI_WALK_METHOD) {
 268                        /*
 269                         * Found a named object declaration during method execution;
 270                         * we must enter this object into the namespace. The created
 271                         * object is temporary and will be deleted upon completion of
 272                         * the execution of this method.
 273                         *
 274                         * Note 10/2010: Except for the Scope() op. This opcode does
 275                         * not actually create a new object, it refers to an existing
 276                         * object. However, for Scope(), we want to indeed open a
 277                         * new scope.
 278                         */
 279                        if (op->common.aml_opcode != AML_SCOPE_OP) {
 280                                status =
 281                                    acpi_ds_load2_begin_op(walk_state, NULL);
 282                        } else {
 283                                status =
 284                                    acpi_ds_scope_stack_push(op->named.node,
 285                                                             op->named.node->
 286                                                             type, walk_state);
 287                                if (ACPI_FAILURE(status)) {
 288                                        return_ACPI_STATUS(status);
 289                                }
 290                        }
 291                }
 292                break;
 293
 294        case AML_CLASS_EXECUTE:
 295        case AML_CLASS_CREATE:
 296
 297                break;
 298
 299        default:
 300
 301                break;
 302        }
 303
 304        /* Nothing to do here during method execution */
 305
 306        return_ACPI_STATUS(status);
 307
 308error_exit:
 309        status = acpi_ds_method_error(status, walk_state);
 310        return_ACPI_STATUS(status);
 311}
 312
 313/*****************************************************************************
 314 *
 315 * FUNCTION:    acpi_ds_exec_end_op
 316 *
 317 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 318 *
 319 * RETURN:      Status
 320 *
 321 * DESCRIPTION: Ascending callback used during the execution of control
 322 *              methods. The only thing we really need to do here is to
 323 *              notice the beginning of IF, ELSE, and WHILE blocks.
 324 *
 325 ****************************************************************************/
 326
 327acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 328{
 329        union acpi_parse_object *op;
 330        acpi_status status = AE_OK;
 331        u32 op_type;
 332        u32 op_class;
 333        union acpi_parse_object *next_op;
 334        union acpi_parse_object *first_arg;
 335#ifdef ACPI_EXEC_APP
 336        char *namepath;
 337        union acpi_operand_object *obj_desc;
 338#endif
 339
 340        ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
 341
 342        op = walk_state->op;
 343        op_type = walk_state->op_info->type;
 344        op_class = walk_state->op_info->class;
 345
 346        if (op_class == AML_CLASS_UNKNOWN) {
 347                ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
 348                            op->common.aml_opcode));
 349                return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 350        }
 351
 352        first_arg = op->common.value.arg;
 353
 354        /* Init the walk state */
 355
 356        walk_state->num_operands = 0;
 357        walk_state->operand_index = 0;
 358        walk_state->return_desc = NULL;
 359        walk_state->result_obj = NULL;
 360
 361        /* Call debugger for single step support (DEBUG build only) */
 362
 363        status = acpi_db_single_step(walk_state, op, op_class);
 364        if (ACPI_FAILURE(status)) {
 365                return_ACPI_STATUS(status);
 366        }
 367
 368        /* Decode the Opcode Class */
 369
 370        switch (op_class) {
 371        case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */
 372
 373                if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 374                        status = acpi_ds_evaluate_name_path(walk_state);
 375                        if (ACPI_FAILURE(status)) {
 376                                goto cleanup;
 377                        }
 378                }
 379                break;
 380
 381        case AML_CLASS_EXECUTE: /* Most operators with arguments */
 382
 383                /* Build resolved operand stack */
 384
 385                status = acpi_ds_create_operands(walk_state, first_arg);
 386                if (ACPI_FAILURE(status)) {
 387                        goto cleanup;
 388                }
 389
 390                /*
 391                 * All opcodes require operand resolution, with the only exceptions
 392                 * being the object_type and size_of operators.
 393                 */
 394                if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
 395
 396                        /* Resolve all operands */
 397
 398                        status = acpi_ex_resolve_operands(walk_state->opcode,
 399                                                          &(walk_state->
 400                                                            operands
 401                                                            [walk_state->
 402                                                             num_operands - 1]),
 403                                                          walk_state);
 404                }
 405
 406                if (ACPI_SUCCESS(status)) {
 407                        /*
 408                         * Dispatch the request to the appropriate interpreter handler
 409                         * routine. There is one routine per opcode "type" based upon the
 410                         * number of opcode arguments and return type.
 411                         */
 412                        status =
 413                            acpi_gbl_op_type_dispatch[op_type] (walk_state);
 414                } else {
 415                        /*
 416                         * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
 417                         * Local is uninitialized.
 418                         */
 419                        if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 420                            (walk_state->opcode == AML_STORE_OP) &&
 421                            (walk_state->operands[0]->common.type ==
 422                             ACPI_TYPE_LOCAL_REFERENCE)
 423                            && (walk_state->operands[1]->common.type ==
 424                                ACPI_TYPE_LOCAL_REFERENCE)
 425                            && (walk_state->operands[0]->reference.class ==
 426                                walk_state->operands[1]->reference.class)
 427                            && (walk_state->operands[0]->reference.value ==
 428                                walk_state->operands[1]->reference.value)) {
 429                                status = AE_OK;
 430                        } else {
 431                                ACPI_EXCEPTION((AE_INFO, status,
 432                                                "While resolving operands for [%s]",
 433                                                acpi_ps_get_opcode_name
 434                                                (walk_state->opcode)));
 435                        }
 436                }
 437
 438                /* Always delete the argument objects and clear the operand stack */
 439
 440                acpi_ds_clear_operands(walk_state);
 441
 442                /*
 443                 * If a result object was returned from above, push it on the
 444                 * current result stack
 445                 */
 446                if (ACPI_SUCCESS(status) && walk_state->result_obj) {
 447                        status =
 448                            acpi_ds_result_push(walk_state->result_obj,
 449                                                walk_state);
 450                }
 451                break;
 452
 453        default:
 454
 455                switch (op_type) {
 456                case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 457
 458                        /* 1 Operand, 0 external_result, 0 internal_result */
 459
 460                        status = acpi_ds_exec_end_control_op(walk_state, op);
 461
 462                        break;
 463
 464                case AML_TYPE_METHOD_CALL:
 465                        /*
 466                         * If the method is referenced from within a package
 467                         * declaration, it is not a invocation of the method, just
 468                         * a reference to it.
 469                         */
 470                        if ((op->asl.parent) &&
 471                            ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
 472                             || (op->asl.parent->asl.aml_opcode ==
 473                                 AML_VARIABLE_PACKAGE_OP))) {
 474                                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 475                                                  "Method Reference in a Package, Op=%p\n",
 476                                                  op));
 477
 478                                op->common.node = (struct acpi_namespace_node *)
 479                                    op->asl.value.arg->asl.node;
 480                                acpi_ut_add_reference(op->asl.value.arg->asl.
 481                                                      node->object);
 482                                return_ACPI_STATUS(AE_OK);
 483                        }
 484
 485                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 486                                          "Method invocation, Op=%p\n", op));
 487
 488                        /*
 489                         * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
 490                         * the method Node pointer
 491                         */
 492                        /* next_op points to the op that holds the method name */
 493
 494                        next_op = first_arg;
 495
 496                        /* next_op points to first argument op */
 497
 498                        next_op = next_op->common.next;
 499
 500                        /*
 501                         * Get the method's arguments and put them on the operand stack
 502                         */
 503                        status = acpi_ds_create_operands(walk_state, next_op);
 504                        if (ACPI_FAILURE(status)) {
 505                                break;
 506                        }
 507
 508                        /*
 509                         * Since the operands will be passed to another control method,
 510                         * we must resolve all local references here (Local variables,
 511                         * arguments to *this* method, etc.)
 512                         */
 513                        status = acpi_ds_resolve_operands(walk_state);
 514                        if (ACPI_FAILURE(status)) {
 515
 516                                /* On error, clear all resolved operands */
 517
 518                                acpi_ds_clear_operands(walk_state);
 519                                break;
 520                        }
 521
 522                        /*
 523                         * Tell the walk loop to preempt this running method and
 524                         * execute the new method
 525                         */
 526                        status = AE_CTRL_TRANSFER;
 527
 528                        /*
 529                         * Return now; we don't want to disturb anything,
 530                         * especially the operand count!
 531                         */
 532                        return_ACPI_STATUS(status);
 533
 534                case AML_TYPE_CREATE_FIELD:
 535
 536                        ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 537                                          "Executing CreateField Buffer/Index Op=%p\n",
 538                                          op));
 539
 540                        status = acpi_ds_load2_end_op(walk_state);
 541                        if (ACPI_FAILURE(status)) {
 542                                break;
 543                        }
 544
 545                        status =
 546                            acpi_ds_eval_buffer_field_operands(walk_state, op);
 547                        if (ACPI_FAILURE(status)) {
 548                                break;
 549                        }
 550#ifdef ACPI_EXEC_APP
 551                        /*
 552                         * acpi_exec support for namespace initialization file (initialize
 553                         * buffer_fields in this code.)
 554                         */
 555                        namepath =
 556                            acpi_ns_get_external_pathname(op->common.node);
 557                        status = ae_lookup_init_file_entry(namepath, &obj_desc);
 558                        if (ACPI_SUCCESS(status)) {
 559                                status =
 560                                    acpi_ex_write_data_to_field(obj_desc,
 561                                                                op->common.
 562                                                                node->object,
 563                                                                NULL);
 564                                if ACPI_FAILURE
 565                                        (status) {
 566                                        ACPI_EXCEPTION((AE_INFO, status,
 567                                                        "While writing to buffer field"));
 568                                        }
 569                        }
 570                        ACPI_FREE(namepath);
 571                        status = AE_OK;
 572#endif
 573                        break;
 574
 575                case AML_TYPE_CREATE_OBJECT:
 576
 577                        ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 578                                          "Executing CreateObject (Buffer/Package) Op=%p Child=%p ParentOpcode=%4.4X\n",
 579                                          op, op->named.value.arg,
 580                                          op->common.parent->common.
 581                                          aml_opcode));
 582
 583                        switch (op->common.parent->common.aml_opcode) {
 584                        case AML_NAME_OP:
 585                                /*
 586                                 * Put the Node on the object stack (Contains the ACPI Name
 587                                 * of this object)
 588                                 */
 589                                walk_state->operands[0] = (void *)
 590                                    op->common.parent->common.node;
 591                                walk_state->num_operands = 1;
 592
 593                                status = acpi_ds_create_node(walk_state,
 594                                                             op->common.parent->
 595                                                             common.node,
 596                                                             op->common.parent);
 597                                if (ACPI_FAILURE(status)) {
 598                                        break;
 599                                }
 600
 601                                ACPI_FALLTHROUGH;
 602
 603                        case AML_INT_EVAL_SUBTREE_OP:
 604
 605                                status =
 606                                    acpi_ds_eval_data_object_operands
 607                                    (walk_state, op,
 608                                     acpi_ns_get_attached_object(op->common.
 609                                                                 parent->common.
 610                                                                 node));
 611                                break;
 612
 613                        default:
 614
 615                                status =
 616                                    acpi_ds_eval_data_object_operands
 617                                    (walk_state, op, NULL);
 618                                break;
 619                        }
 620
 621                        /*
 622                         * If a result object was returned from above, push it on the
 623                         * current result stack
 624                         */
 625                        if (walk_state->result_obj) {
 626                                status =
 627                                    acpi_ds_result_push(walk_state->result_obj,
 628                                                        walk_state);
 629                        }
 630                        break;
 631
 632                case AML_TYPE_NAMED_FIELD:
 633                case AML_TYPE_NAMED_COMPLEX:
 634                case AML_TYPE_NAMED_SIMPLE:
 635                case AML_TYPE_NAMED_NO_OBJ:
 636
 637                        status = acpi_ds_load2_end_op(walk_state);
 638                        if (ACPI_FAILURE(status)) {
 639                                break;
 640                        }
 641
 642                        if (op->common.aml_opcode == AML_REGION_OP) {
 643                                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 644                                                  "Executing OpRegion Address/Length Op=%p\n",
 645                                                  op));
 646
 647                                status =
 648                                    acpi_ds_eval_region_operands(walk_state,
 649                                                                 op);
 650                                if (ACPI_FAILURE(status)) {
 651                                        break;
 652                                }
 653                        } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 654                                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 655                                                  "Executing DataTableRegion Strings Op=%p\n",
 656                                                  op));
 657
 658                                status =
 659                                    acpi_ds_eval_table_region_operands
 660                                    (walk_state, op);
 661                                if (ACPI_FAILURE(status)) {
 662                                        break;
 663                                }
 664                        } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
 665                                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 666                                                  "Executing BankField Op=%p\n",
 667                                                  op));
 668
 669                                status =
 670                                    acpi_ds_eval_bank_field_operands(walk_state,
 671                                                                     op);
 672                                if (ACPI_FAILURE(status)) {
 673                                        break;
 674                                }
 675                        }
 676                        break;
 677
 678                case AML_TYPE_UNDEFINED:
 679
 680                        ACPI_ERROR((AE_INFO,
 681                                    "Undefined opcode type Op=%p", op));
 682                        return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 683
 684                case AML_TYPE_BOGUS:
 685
 686                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 687                                          "Internal opcode=%X type Op=%p\n",
 688                                          walk_state->opcode, op));
 689                        break;
 690
 691                default:
 692
 693                        ACPI_ERROR((AE_INFO,
 694                                    "Unimplemented opcode, class=0x%X "
 695                                    "type=0x%X Opcode=0x%X Op=%p",
 696                                    op_class, op_type, op->common.aml_opcode,
 697                                    op));
 698
 699                        status = AE_NOT_IMPLEMENTED;
 700                        break;
 701                }
 702        }
 703
 704        /*
 705         * ACPI 2.0 support for 64-bit integers: Truncate numeric
 706         * result value if we are executing from a 32-bit ACPI table
 707         */
 708        (void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);
 709
 710        /*
 711         * Check if we just completed the evaluation of a
 712         * conditional predicate
 713         */
 714        if ((ACPI_SUCCESS(status)) &&
 715            (walk_state->control_state) &&
 716            (walk_state->control_state->common.state ==
 717             ACPI_CONTROL_PREDICATE_EXECUTING) &&
 718            (walk_state->control_state->control.predicate_op == op)) {
 719                status =
 720                    acpi_ds_get_predicate_value(walk_state,
 721                                                walk_state->result_obj);
 722                walk_state->result_obj = NULL;
 723        }
 724
 725cleanup:
 726
 727        if (walk_state->result_obj) {
 728
 729                /* Break to debugger to display result */
 730
 731                acpi_db_display_result_object(walk_state->result_obj,
 732                                              walk_state);
 733
 734                /*
 735                 * Delete the result op if and only if:
 736                 * Parent will not use the result -- such as any
 737                 * non-nested type2 op in a method (parent will be method)
 738                 */
 739                acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
 740                                                  walk_state);
 741        }
 742#ifdef _UNDER_DEVELOPMENT
 743
 744        if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
 745                acpi_db_method_end(walk_state);
 746        }
 747#endif
 748
 749        /* Invoke exception handler on error */
 750
 751        if (ACPI_FAILURE(status)) {
 752                status = acpi_ds_method_error(status, walk_state);
 753        }
 754
 755        /* Always clear the object stack */
 756
 757        walk_state->num_operands = 0;
 758        return_ACPI_STATUS(status);
 759}
 760