drivers/acpi/acpica/dswexec.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswexec - Dispatcher method execution callbacks;
   4  *                        dispatch to interpreter.
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2016, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acparser.h"
  48 #include "amlcode.h"
  49 #include "acdispat.h"
  50 #include "acinterp.h"
  51 #include "acnamesp.h"
  52 #include "acdebug.h"
  53
  54 #define _COMPONENT          ACPI_DISPATCHER
  55 ACPI_MODULE_NAME("dswexec")
  56
  57 /*
  58  * Dispatch table for opcode classes
  59  */
  60 static acpi_execute_op acpi_gbl_op_type_dispatch[] = {
  61         acpi_ex_opcode_0A_0T_1R,
  62         acpi_ex_opcode_1A_0T_0R,
  63         acpi_ex_opcode_1A_0T_1R,
  64         acpi_ex_opcode_1A_1T_0R,
  65         acpi_ex_opcode_1A_1T_1R,
  66         acpi_ex_opcode_2A_0T_0R,
  67         acpi_ex_opcode_2A_0T_1R,
  68         acpi_ex_opcode_2A_1T_1R,
  69         acpi_ex_opcode_2A_2T_1R,
  70         acpi_ex_opcode_3A_0T_0R,
  71         acpi_ex_opcode_3A_1T_1R,
  72         acpi_ex_opcode_6A_0T_1R
  73 };
  74
  75 /*****************************************************************************
  76  *
  77  * FUNCTION:    acpi_ds_get_predicate_value
  78  *
  79  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  80  *              result_obj      - if non-zero, pop result from result stack
  81  *
  82  * RETURN:      Status
  83  *
  84  * DESCRIPTION: Get the result of a predicate evaluation
  85  *
  86  ****************************************************************************/
  87
  88 acpi_status
  89 acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
  90                             union acpi_operand_object *result_obj)
  91 {
  92         acpi_status status = AE_OK;
  93         union acpi_operand_object *obj_desc;
  94         union acpi_operand_object *local_obj_desc = NULL;
  95
  96         ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
  97
  98         walk_state->control_state->common.state = 0;
  99
 100         if (result_obj) {
 101                 status = acpi_ds_result_pop(&obj_desc, walk_state);
 102                 if (ACPI_FAILURE(status)) {
 103                         ACPI_EXCEPTION((AE_INFO, status,
 104                                         "Could not get result from predicate evaluation"));
 105
 106                         return_ACPI_STATUS(status);
 107                 }
 108         } else {
 109                 status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
 110                 if (ACPI_FAILURE(status)) {
 111                         return_ACPI_STATUS(status);
 112                 }
 113
 114                 status =
 115                     acpi_ex_resolve_to_value(&walk_state->operands[0],
 116                                              walk_state);
 117                 if (ACPI_FAILURE(status)) {
 118                         return_ACPI_STATUS(status);
 119                 }
 120
 121                 obj_desc = walk_state->operands[0];
 122         }
 123
 124         if (!obj_desc) {
 125                 ACPI_ERROR((AE_INFO,
 126                             "No predicate ObjDesc=%p State=%p",
 127                             obj_desc, walk_state));
 128
 129                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 130         }
 131
 132         /*
 133          * Result of predicate evaluation must be an Integer
 134          * object. Implicitly convert the argument if necessary.
 135          */
 136         status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc, 16);
 137         if (ACPI_FAILURE(status)) {
 138                 goto cleanup;
 139         }
 140
 141         if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
 142                 ACPI_ERROR((AE_INFO,
 143                             "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
 144                             obj_desc, walk_state, obj_desc->common.type));
 145
 146                 status = AE_AML_OPERAND_TYPE;
 147                 goto cleanup;
 148         }
 149
 150         /* Truncate the predicate to 32-bits if necessary */
 151
 152         (void)acpi_ex_truncate_for32bit_table(local_obj_desc);
 153
 154         /*
 155          * Save the result of the predicate evaluation on
 156          * the control stack
 157          */
 158         if (local_obj_desc->integer.value) {
 159                 walk_state->control_state->common.value = TRUE;
 160         } else {
 161                 /*
 162                  * Predicate is FALSE, we will just toss the
 163                  * rest of the package
 164                  */
 165                 walk_state->control_state->common.value = FALSE;
 166                 status = AE_CTRL_FALSE;
 167         }
 168
 169         /* Predicate can be used for an implicit return value */
 170
 171         (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
 172
 173 cleanup:
 174
 175         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 176                           "Completed a predicate eval=%X Op=%p\n",
 177                           walk_state->control_state->common.value,
 178                           walk_state->op));
 179
 180         /* Break to debugger to display result */
 181
 182         acpi_db_display_result_object(local_obj_desc, walk_state);
 183
 184         /*
 185          * Delete the predicate result object (we know that
 186          * we don't need it anymore)
 187          */
 188         if (local_obj_desc != obj_desc) {
 189                 acpi_ut_remove_reference(local_obj_desc);
 190         }
 191         acpi_ut_remove_reference(obj_desc);
 192
 193         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
 194         return_ACPI_STATUS(status);
 195 }
 196
 197 /*****************************************************************************
 198  *
 199  * FUNCTION:    acpi_ds_exec_begin_op
 200  *
 201  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 202  *              out_op          - Where to return op if a new one is created
 203  *
 204  * RETURN:      Status
 205  *
 206  * DESCRIPTION: Descending callback used during the execution of control
 207  *              methods. This is where most operators and operands are
 208  *              dispatched to the interpreter.
 209  *
 210  ****************************************************************************/
 211
 212 acpi_status
 213 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
 214                       union acpi_parse_object **out_op)
 215 {
 216         union acpi_parse_object *op;
 217         acpi_status status = AE_OK;
 218         u32 opcode_class;
 219
 220         ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
 221
 222         op = walk_state->op;
 223         if (!op) {
 224                 status = acpi_ds_load2_begin_op(walk_state, out_op);
 225                 if (ACPI_FAILURE(status)) {
 226                         goto error_exit;
 227                 }
 228
 229                 op = *out_op;
 230                 walk_state->op = op;
 231                 walk_state->opcode = op->common.aml_opcode;
 232                 walk_state->op_info =
 233                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 234
 235                 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
 236                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 237                                           "(%s) Popping scope for Op %p\n",
 238                                           acpi_ut_get_type_name(walk_state->
 239                                                                 op_info->
 240                                                                 object_type),
 241                                           op));
 242
 243                         status = acpi_ds_scope_stack_pop(walk_state);
 244                         if (ACPI_FAILURE(status)) {
 245                                 goto error_exit;
 246                         }
 247                 }
 248         }
 249
 250         if (op == walk_state->origin) {
 251                 if (out_op) {
 252                         *out_op = op;
 253                 }
 254
 255                 return_ACPI_STATUS(AE_OK);
 256         }
 257
 258         /*
 259          * If the previous opcode was a conditional, this opcode
 260          * must be the beginning of the associated predicate.
 261          * Save this knowledge in the current scope descriptor
 262          */
 263         if ((walk_state->control_state) &&
 264             (walk_state->control_state->common.state ==
 265              ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 266                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 267                                   "Exec predicate Op=%p State=%p\n",
 268                                   op, walk_state));
 269
 270                 walk_state->control_state->common.state =
 271                     ACPI_CONTROL_PREDICATE_EXECUTING;
 272
 273                 /* Save start of predicate */
 274
 275                 walk_state->control_state->control.predicate_op = op;
 276         }
 277
 278         opcode_class = walk_state->op_info->class;
 279
 280         /* We want to send namepaths to the load code */
 281
 282         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 283                 opcode_class = AML_CLASS_NAMED_OBJECT;
 284         }
 285
 286         /*
 287          * Handle the opcode based upon the opcode type
 288          */
 289         switch (opcode_class) {
 290         case AML_CLASS_CONTROL:
 291
 292                 status = acpi_ds_exec_begin_control_op(walk_state, op);
 293                 break;
 294
 295         case AML_CLASS_NAMED_OBJECT:
 296
 297                 if (walk_state->walk_type & ACPI_WALK_METHOD) {
 298                         /*
 299                          * Found a named object declaration during method execution;
 300                          * we must enter this object into the namespace. The created
 301                          * object is temporary and will be deleted upon completion of
 302                          * the execution of this method.
 303                          *
 304                          * Note 10/2010: Except for the Scope() op. This opcode does
 305                          * not actually create a new object, it refers to an existing
 306                          * object. However, for Scope(), we want to indeed open a
 307                          * new scope.
 308                          */
 309                         if (op->common.aml_opcode != AML_SCOPE_OP) {
 310                                 status =
 311                                     acpi_ds_load2_begin_op(walk_state, NULL);
 312                         } else {
 313                                 status =
 314                                     acpi_ds_scope_stack_push(op->named.node,
 315                                                              op->named.node->
 316                                                              type, walk_state);
 317                                 if (ACPI_FAILURE(status)) {
 318                                         return_ACPI_STATUS(status);
 319                                 }
 320                         }
 321                 }
 322                 break;
 323
 324         case AML_CLASS_EXECUTE:
 325         case AML_CLASS_CREATE:
 326
 327                 break;
 328
 329         default:
 330
 331                 break;
 332         }
 333
 334         /* Nothing to do here during method execution */
 335
 336         return_ACPI_STATUS(status);
 337
 338 error_exit:
 339         status = acpi_ds_method_error(status, walk_state);
 340         return_ACPI_STATUS(status);
 341 }
 342
 343 /*****************************************************************************
 344  *
 345  * FUNCTION:    acpi_ds_exec_end_op
 346  *
 347  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 348  *
 349  * RETURN:      Status
 350  *
 351  * DESCRIPTION: Ascending callback used during the execution of control
 352  *              methods. The only thing we really need to do here is to
 353  *              notice the beginning of IF, ELSE, and WHILE blocks.
 354  *
 355  ****************************************************************************/
 356
 357 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 358 {
 359         union acpi_parse_object *op;
 360         acpi_status status = AE_OK;
 361         u32 op_type;
 362         u32 op_class;
 363         union acpi_parse_object *next_op;
 364         union acpi_parse_object *first_arg;
 365
 366         ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
 367
 368         op = walk_state->op;
 369         op_type = walk_state->op_info->type;
 370         op_class = walk_state->op_info->class;
 371
 372         if (op_class == AML_CLASS_UNKNOWN) {
 373                 ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
 374                             op->common.aml_opcode));
 375                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 376         }
 377
 378         first_arg = op->common.value.arg;
 379
 380         /* Init the walk state */
 381
 382         walk_state->num_operands = 0;
 383         walk_state->operand_index = 0;
 384         walk_state->return_desc = NULL;
 385         walk_state->result_obj = NULL;
 386
 387         /* Call debugger for single step support (DEBUG build only) */
 388
 389         status = acpi_db_single_step(walk_state, op, op_class);
 390         if (ACPI_FAILURE(status)) {
 391                 return_ACPI_STATUS(status);
 392         }
 393
 394         /* Decode the Opcode Class */
 395
 396         switch (op_class) {
 397         case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */
 398
 399                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 400                         status = acpi_ds_evaluate_name_path(walk_state);
 401                         if (ACPI_FAILURE(status)) {
 402                                 goto cleanup;
 403                         }
 404                 }
 405                 break;
 406
 407         case AML_CLASS_EXECUTE: /* Most operators with arguments */
 408
 409                 /* Build resolved operand stack */
 410
 411                 status = acpi_ds_create_operands(walk_state, first_arg);
 412                 if (ACPI_FAILURE(status)) {
 413                         goto cleanup;
 414                 }
 415
 416                 /*
 417                  * All opcodes require operand resolution, with the only exceptions
 418                  * being the object_type and size_of operators.
 419                  */
 420                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
 421
 422                         /* Resolve all operands */
 423
 424                         status = acpi_ex_resolve_operands(walk_state->opcode,
 425                                                           &(walk_state->
 426                                                             operands
 427                                                             [walk_state->
 428                                                              num_operands - 1]),
 429                                                           walk_state);
 430                 }
 431
 432                 if (ACPI_SUCCESS(status)) {
 433                         /*
 434                          * Dispatch the request to the appropriate interpreter handler
 435                          * routine. There is one routine per opcode "type" based upon the
 436                          * number of opcode arguments and return type.
 437                          */
 438                         status =
 439                             acpi_gbl_op_type_dispatch[op_type] (walk_state);
 440                 } else {
 441                         /*
 442                          * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
 443                          * Local is uninitialized.
 444                          */
 445                         if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 446                             (walk_state->opcode == AML_STORE_OP) &&
 447                             (walk_state->operands[0]->common.type ==
 448                              ACPI_TYPE_LOCAL_REFERENCE)
 449                             && (walk_state->operands[1]->common.type ==
 450                                 ACPI_TYPE_LOCAL_REFERENCE)
 451                             && (walk_state->operands[0]->reference.class ==
 452                                 walk_state->operands[1]->reference.class)
 453                             && (walk_state->operands[0]->reference.value ==
 454                                 walk_state->operands[1]->reference.value)) {
 455                                 status = AE_OK;
 456                         } else {
 457                                 ACPI_EXCEPTION((AE_INFO, status,
 458                                                 "While resolving operands for [%s]",
 459                                                 acpi_ps_get_opcode_name
 460                                                 (walk_state->opcode)));
 461                         }
 462                 }
 463
 464                 /* Always delete the argument objects and clear the operand stack */
 465
 466                 acpi_ds_clear_operands(walk_state);
 467
 468                 /*
 469                  * If a result object was returned from above, push it on the
 470                  * current result stack
 471                  */
 472                 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
 473                         status =
 474                             acpi_ds_result_push(walk_state->result_obj,
 475                                                 walk_state);
 476                 }
 477                 break;
 478
 479         default:
 480
 481                 switch (op_type) {
 482                 case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 483
 484                         /* 1 Operand, 0 external_result, 0 internal_result */
 485
 486                         status = acpi_ds_exec_end_control_op(walk_state, op);
 487
 488                         break;
 489
 490                 case AML_TYPE_METHOD_CALL:
 491                         /*
 492                          * If the method is referenced from within a package
 493                          * declaration, it is not a invocation of the method, just
 494                          * a reference to it.
 495                          */
 496                         if ((op->asl.parent) &&
 497                             ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
 498                              || (op->asl.parent->asl.aml_opcode ==
 499                                  AML_VAR_PACKAGE_OP))) {
 500                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 501                                                   "Method Reference in a Package, Op=%p\n",
 502                                                   op));
 503
 504                                 op->common.node = (struct acpi_namespace_node *)
 505                                     op->asl.value.arg->asl.node;
 506                                 acpi_ut_add_reference(op->asl.value.arg->asl.
 507                                                       node->object);
 508                                 return_ACPI_STATUS(AE_OK);
 509                         }
 510
 511                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 512                                           "Method invocation, Op=%p\n", op));
 513
 514                         /*
 515                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
 516                          * the method Node pointer
 517                          */
 518                         /* next_op points to the op that holds the method name */
 519
 520                         next_op = first_arg;
 521
 522                         /* next_op points to first argument op */
 523
 524                         next_op = next_op->common.next;
 525
 526                         /*
 527                          * Get the method's arguments and put them on the operand stack
 528                          */
 529                         status = acpi_ds_create_operands(walk_state, next_op);
 530                         if (ACPI_FAILURE(status)) {
 531                                 break;
 532                         }
 533
 534                         /*
 535                          * Since the operands will be passed to another control method,
 536                          * we must resolve all local references here (Local variables,
 537                          * arguments to *this* method, etc.)
 538                          */
 539                         status = acpi_ds_resolve_operands(walk_state);
 540                         if (ACPI_FAILURE(status)) {
 541
 542                                 /* On error, clear all resolved operands */
 543
 544                                 acpi_ds_clear_operands(walk_state);
 545                                 break;
 546                         }
 547
 548                         /*
 549                          * Tell the walk loop to preempt this running method and
 550                          * execute the new method
 551                          */
 552                         status = AE_CTRL_TRANSFER;
 553
 554                         /*
 555                          * Return now; we don't want to disturb anything,
 556                          * especially the operand count!
 557                          */
 558                         return_ACPI_STATUS(status);
 559
 560                 case AML_TYPE_CREATE_FIELD:
 561
 562                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 563                                           "Executing CreateField Buffer/Index Op=%p\n",
 564                                           op));
 565
 566                         status = acpi_ds_load2_end_op(walk_state);
 567                         if (ACPI_FAILURE(status)) {
 568                                 break;
 569                         }
 570
 571                         status =
 572                             acpi_ds_eval_buffer_field_operands(walk_state, op);
 573                         break;
 574
 575                 case AML_TYPE_CREATE_OBJECT:
 576
 577                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 578                                           "Executing CreateObject (Buffer/Package) Op=%p\n",
 579                                           op));
 580
 581                         switch (op->common.parent->common.aml_opcode) {
 582                         case AML_NAME_OP:
 583                                 /*
 584                                  * Put the Node on the object stack (Contains the ACPI Name
 585                                  * of this object)
 586                                  */
 587                                 walk_state->operands[0] = (void *)
 588                                     op->common.parent->common.node;
 589                                 walk_state->num_operands = 1;
 590
 591                                 status = acpi_ds_create_node(walk_state,
 592                                                              op->common.parent->
 593                                                              common.node,
 594                                                              op->common.parent);
 595                                 if (ACPI_FAILURE(status)) {
 596                                         break;
 597                                 }
 598
 599                                 /* Fall through */
 600                                 /*lint -fallthrough */
 601
 602                         case AML_INT_EVAL_SUBTREE_OP:
 603
 604                                 status =
 605                                     acpi_ds_eval_data_object_operands
 606                                     (walk_state, op,
 607                                      acpi_ns_get_attached_object(op->common.
 608                                                                  parent->common.
 609                                                                  node));
 610                                 break;
 611
 612                         default:
 613
 614                                 status =
 615                                     acpi_ds_eval_data_object_operands
 616                                     (walk_state, op, NULL);
 617                                 break;
 618                         }
 619
 620                         /*
 621                          * If a result object was returned from above, push it on the
 622                          * current result stack
 623                          */
 624                         if (walk_state->result_obj) {
 625                                 status =
 626                                     acpi_ds_result_push(walk_state->result_obj,
 627                                                         walk_state);
 628                         }
 629                         break;
 630
 631                 case AML_TYPE_NAMED_FIELD:
 632                 case AML_TYPE_NAMED_COMPLEX:
 633                 case AML_TYPE_NAMED_SIMPLE:
 634                 case AML_TYPE_NAMED_NO_OBJ:
 635
 636                         status = acpi_ds_load2_end_op(walk_state);
 637                         if (ACPI_FAILURE(status)) {
 638                                 break;
 639                         }
 640
 641                         if (op->common.aml_opcode == AML_REGION_OP) {
 642                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 643                                                   "Executing OpRegion Address/Length Op=%p\n",
 644                                                   op));
 645
 646                                 status =
 647                                     acpi_ds_eval_region_operands(walk_state,
 648                                                                  op);
 649                                 if (ACPI_FAILURE(status)) {
 650                                         break;
 651                                 }
 652                         } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 653                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 654                                                   "Executing DataTableRegion Strings Op=%p\n",
 655                                                   op));
 656
 657                                 status =
 658                                     acpi_ds_eval_table_region_operands
 659                                     (walk_state, op);
 660                                 if (ACPI_FAILURE(status)) {
 661                                         break;
 662                                 }
 663                         } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
 664                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 665                                                   "Executing BankField Op=%p\n",
 666                                                   op));
 667
 668                                 status =
 669                                     acpi_ds_eval_bank_field_operands(walk_state,
 670                                                                      op);
 671                                 if (ACPI_FAILURE(status)) {
 672                                         break;
 673                                 }
 674                         }
 675                         break;
 676
 677                 case AML_TYPE_UNDEFINED:
 678
 679                         ACPI_ERROR((AE_INFO,
 680                                     "Undefined opcode type Op=%p", op));
 681                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 682
 683                 case AML_TYPE_BOGUS:
 684
 685                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 686                                           "Internal opcode=%X type Op=%p\n",
 687                                           walk_state->opcode, op));
 688                         break;
 689
 690                 default:
 691
 692                         ACPI_ERROR((AE_INFO,
 693                                     "Unimplemented opcode, class=0x%X "
 694                                     "type=0x%X Opcode=0x%X Op=%p",
 695                                     op_class, op_type, op->common.aml_opcode,
 696                                     op));
 697
 698                         status = AE_NOT_IMPLEMENTED;
 699                         break;
 700                 }
 701         }
 702
 703         /*
 704          * ACPI 2.0 support for 64-bit integers: Truncate numeric
 705          * result value if we are executing from a 32-bit ACPI table
 706          */
 707         (void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);
 708
 709         /*
 710          * Check if we just completed the evaluation of a
 711          * conditional predicate
 712          */
 713         if ((ACPI_SUCCESS(status)) &&
 714             (walk_state->control_state) &&
 715             (walk_state->control_state->common.state ==
 716              ACPI_CONTROL_PREDICATE_EXECUTING) &&
 717             (walk_state->control_state->control.predicate_op == op)) {
 718                 status =
 719                     acpi_ds_get_predicate_value(walk_state,
 720                                                 walk_state->result_obj);
 721                 walk_state->result_obj = NULL;
 722         }
 723
 724 cleanup:
 725
 726         if (walk_state->result_obj) {
 727
 728                 /* Break to debugger to display result */
 729
 730                 acpi_db_display_result_object(walk_state->result_obj,
 731                                               walk_state);
 732
 733                 /*
 734                  * Delete the result op if and only if:
 735                  * Parent will not use the result -- such as any
 736                  * non-nested type2 op in a method (parent will be method)
 737                  */
 738                 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
 739                                                   walk_state);
 740         }
 741 #ifdef _UNDER_DEVELOPMENT
 742
 743         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
 744                 acpi_db_method_end(walk_state);
 745         }
 746 #endif
 747
 748         /* Invoke exception handler on error */
 749
 750         if (ACPI_FAILURE(status)) {
 751                 status = acpi_ds_method_error(status, walk_state);
 752         }
 753
 754         /* Always clear the object stack */
 755
 756         walk_state->num_operands = 0;
 757         return_ACPI_STATUS(status);
 758 }