drivers/acpi/dispatcher/dswexec.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswexec - Dispatcher method execution callbacks;
   4  *                        dispatch to interpreter.
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2007, R. Byron Moore
  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 <acpi/acparser.h>
  47 #include <acpi/amlcode.h>
  48 #include <acpi/acdispat.h>
  49 #include <acpi/acinterp.h>
  50 #include <acpi/acnamesp.h>
  51 #include <acpi/acdebug.h>
  52
  53 #define _COMPONENT          ACPI_DISPATCHER
  54 ACPI_MODULE_NAME("dswexec")
  55
  56 /*
  57  * Dispatch table for opcode classes
  58  */
  59 static ACPI_EXECUTE_OP acpi_gbl_op_type_dispatch[] = {
  60         acpi_ex_opcode_0A_0T_1R,
  61         acpi_ex_opcode_1A_0T_0R,
  62         acpi_ex_opcode_1A_0T_1R,
  63         acpi_ex_opcode_1A_1T_0R,
  64         acpi_ex_opcode_1A_1T_1R,
  65         acpi_ex_opcode_2A_0T_0R,
  66         acpi_ex_opcode_2A_0T_1R,
  67         acpi_ex_opcode_2A_1T_1R,
  68         acpi_ex_opcode_2A_2T_1R,
  69         acpi_ex_opcode_3A_0T_0R,
  70         acpi_ex_opcode_3A_1T_1R,
  71         acpi_ex_opcode_6A_0T_1R
  72 };
  73
  74 /*****************************************************************************
  75  *
  76  * FUNCTION:    acpi_ds_get_predicate_value
  77  *
  78  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  79  *              result_obj      - if non-zero, pop result from result stack
  80  *
  81  * RETURN:      Status
  82  *
  83  * DESCRIPTION: Get the result of a predicate evaluation
  84  *
  85  ****************************************************************************/
  86
  87 acpi_status
  88 acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
  89                             union acpi_operand_object *result_obj)
  90 {
  91         acpi_status status = AE_OK;
  92         union acpi_operand_object *obj_desc;
  93         union acpi_operand_object *local_obj_desc = NULL;
  94
  95         ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
  96
  97         walk_state->control_state->common.state = 0;
  98
  99         if (result_obj) {
 100                 status = acpi_ds_result_pop(&obj_desc, walk_state);
 101                 if (ACPI_FAILURE(status)) {
 102                         ACPI_EXCEPTION((AE_INFO, status,
 103                                         "Could not get result from predicate evaluation"));
 104
 105                         return_ACPI_STATUS(status);
 106                 }
 107         } else {
 108                 status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
 109                 if (ACPI_FAILURE(status)) {
 110                         return_ACPI_STATUS(status);
 111                 }
 112
 113                 status =
 114                     acpi_ex_resolve_to_value(&walk_state->operands[0],
 115                                              walk_state);
 116                 if (ACPI_FAILURE(status)) {
 117                         return_ACPI_STATUS(status);
 118                 }
 119
 120                 obj_desc = walk_state->operands[0];
 121         }
 122
 123         if (!obj_desc) {
 124                 ACPI_ERROR((AE_INFO,
 125                             "No predicate ObjDesc=%p State=%p",
 126                             obj_desc, walk_state));
 127
 128                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 129         }
 130
 131         /*
 132          * Result of predicate evaluation must be an Integer
 133          * object. Implicitly convert the argument if necessary.
 134          */
 135         status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc, 16);
 136         if (ACPI_FAILURE(status)) {
 137                 goto cleanup;
 138         }
 139
 140         if (ACPI_GET_OBJECT_TYPE(local_obj_desc) != ACPI_TYPE_INTEGER) {
 141                 ACPI_ERROR((AE_INFO,
 142                             "Bad predicate (not an integer) ObjDesc=%p State=%p Type=%X",
 143                             obj_desc, walk_state,
 144                             ACPI_GET_OBJECT_TYPE(obj_desc)));
 145
 146                 status = AE_AML_OPERAND_TYPE;
 147                 goto cleanup;
 148         }
 149
 150         /* Truncate the predicate to 32-bits if necessary */
 151
 152         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       cleanup:
 170
 171         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
 172                           walk_state->control_state->common.value,
 173                           walk_state->op));
 174
 175         /* Break to debugger to display result */
 176
 177         ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
 178                            (local_obj_desc, walk_state));
 179
 180         /*
 181          * Delete the predicate result object (we know that
 182          * we don't need it anymore)
 183          */
 184         if (local_obj_desc != obj_desc) {
 185                 acpi_ut_remove_reference(local_obj_desc);
 186         }
 187         acpi_ut_remove_reference(obj_desc);
 188
 189         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
 190         return_ACPI_STATUS(status);
 191 }
 192
 193 /*****************************************************************************
 194  *
 195  * FUNCTION:    acpi_ds_exec_begin_op
 196  *
 197  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 198  *              out_op          - Where to return op if a new one is created
 199  *
 200  * RETURN:      Status
 201  *
 202  * DESCRIPTION: Descending callback used during the execution of control
 203  *              methods.  This is where most operators and operands are
 204  *              dispatched to the interpreter.
 205  *
 206  ****************************************************************************/
 207
 208 acpi_status
 209 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
 210                       union acpi_parse_object **out_op)
 211 {
 212         union acpi_parse_object *op;
 213         acpi_status status = AE_OK;
 214         u32 opcode_class;
 215
 216         ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
 217
 218         op = walk_state->op;
 219         if (!op) {
 220                 status = acpi_ds_load2_begin_op(walk_state, out_op);
 221                 if (ACPI_FAILURE(status)) {
 222                         goto error_exit;
 223                 }
 224
 225                 op = *out_op;
 226                 walk_state->op = op;
 227                 walk_state->opcode = op->common.aml_opcode;
 228                 walk_state->op_info =
 229                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 230
 231                 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
 232                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 233                                           "(%s) Popping scope for Op %p\n",
 234                                           acpi_ut_get_type_name(walk_state->
 235                                                                 op_info->
 236                                                                 object_type),
 237                                           op));
 238
 239                         status = acpi_ds_scope_stack_pop(walk_state);
 240                         if (ACPI_FAILURE(status)) {
 241                                 goto error_exit;
 242                         }
 243                 }
 244         }
 245
 246         if (op == walk_state->origin) {
 247                 if (out_op) {
 248                         *out_op = op;
 249                 }
 250
 251                 return_ACPI_STATUS(AE_OK);
 252         }
 253
 254         /*
 255          * If the previous opcode was a conditional, this opcode
 256          * must be the beginning of the associated predicate.
 257          * Save this knowledge in the current scope descriptor
 258          */
 259         if ((walk_state->control_state) &&
 260             (walk_state->control_state->common.state ==
 261              ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 262                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 263                                   "Exec predicate Op=%p State=%p\n", op,
 264                                   walk_state));
 265
 266                 walk_state->control_state->common.state =
 267                     ACPI_CONTROL_PREDICATE_EXECUTING;
 268
 269                 /* Save start of predicate */
 270
 271                 walk_state->control_state->control.predicate_op = op;
 272         }
 273
 274         opcode_class = walk_state->op_info->class;
 275
 276         /* We want to send namepaths to the load code */
 277
 278         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 279                 opcode_class = AML_CLASS_NAMED_OBJECT;
 280         }
 281
 282         /*
 283          * Handle the opcode based upon the opcode type
 284          */
 285         switch (opcode_class) {
 286         case AML_CLASS_CONTROL:
 287
 288                 status = acpi_ds_exec_begin_control_op(walk_state, op);
 289                 break;
 290
 291         case AML_CLASS_NAMED_OBJECT:
 292
 293                 if (walk_state->walk_type & ACPI_WALK_METHOD) {
 294                         /*
 295                          * Found a named object declaration during method execution;
 296                          * we must enter this object into the namespace.  The created
 297                          * object is temporary and will be deleted upon completion of
 298                          * the execution of this method.
 299                          */
 300                         status = acpi_ds_load2_begin_op(walk_state, NULL);
 301                 }
 302
 303                 break;
 304
 305         case AML_CLASS_EXECUTE:
 306         case AML_CLASS_CREATE:
 307
 308                 break;
 309
 310         default:
 311                 break;
 312         }
 313
 314         /* Nothing to do here during method execution */
 315
 316         return_ACPI_STATUS(status);
 317
 318       error_exit:
 319         status = acpi_ds_method_error(status, walk_state);
 320         return_ACPI_STATUS(status);
 321 }
 322
 323 /*****************************************************************************
 324  *
 325  * FUNCTION:    acpi_ds_exec_end_op
 326  *
 327  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 328  *
 329  * RETURN:      Status
 330  *
 331  * DESCRIPTION: Ascending callback used during the execution of control
 332  *              methods.  The only thing we really need to do here is to
 333  *              notice the beginning of IF, ELSE, and WHILE blocks.
 334  *
 335  ****************************************************************************/
 336
 337 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 338 {
 339         union acpi_parse_object *op;
 340         acpi_status status = AE_OK;
 341         u32 op_type;
 342         u32 op_class;
 343         union acpi_parse_object *next_op;
 344         union acpi_parse_object *first_arg;
 345
 346         ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
 347
 348         op = walk_state->op;
 349         op_type = walk_state->op_info->type;
 350         op_class = walk_state->op_info->class;
 351
 352         if (op_class == AML_CLASS_UNKNOWN) {
 353                 ACPI_ERROR((AE_INFO, "Unknown opcode %X",
 354                             op->common.aml_opcode));
 355                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 356         }
 357
 358         first_arg = op->common.value.arg;
 359
 360         /* Init the walk state */
 361
 362         walk_state->num_operands = 0;
 363         walk_state->operand_index = 0;
 364         walk_state->return_desc = NULL;
 365         walk_state->result_obj = NULL;
 366
 367         /* Call debugger for single step support (DEBUG build only) */
 368
 369         ACPI_DEBUGGER_EXEC(status =
 370                            acpi_db_single_step(walk_state, op, op_class));
 371         ACPI_DEBUGGER_EXEC(if (ACPI_FAILURE(status)) {
 372                            return_ACPI_STATUS(status);}
 373         ) ;
 374
 375         /* Decode the Opcode Class */
 376
 377         switch (op_class) {
 378         case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */
 379
 380                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 381                         status = acpi_ds_evaluate_name_path(walk_state);
 382                         if (ACPI_FAILURE(status)) {
 383                                 goto cleanup;
 384                         }
 385                 }
 386                 break;
 387
 388         case AML_CLASS_EXECUTE: /* Most operators with arguments */
 389
 390                 /* Build resolved operand stack */
 391
 392                 status = acpi_ds_create_operands(walk_state, first_arg);
 393                 if (ACPI_FAILURE(status)) {
 394                         goto cleanup;
 395                 }
 396
 397                 /*
 398                  * All opcodes require operand resolution, with the only exceptions
 399                  * being the object_type and size_of operators.
 400                  */
 401                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
 402
 403                         /* Resolve all operands */
 404
 405                         status = acpi_ex_resolve_operands(walk_state->opcode,
 406                                                           &(walk_state->
 407                                                             operands
 408                                                             [walk_state->
 409                                                              num_operands - 1]),
 410                                                           walk_state);
 411                         if (ACPI_SUCCESS(status)) {
 412                                 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 413                                                    ACPI_IMODE_EXECUTE,
 414                                                    acpi_ps_get_opcode_name
 415                                                    (walk_state->opcode),
 416                                                    walk_state->num_operands,
 417                                                    "after ExResolveOperands");
 418                         }
 419                 }
 420
 421                 if (ACPI_SUCCESS(status)) {
 422                         /*
 423                          * Dispatch the request to the appropriate interpreter handler
 424                          * routine.  There is one routine per opcode "type" based upon the
 425                          * number of opcode arguments and return type.
 426                          */
 427                         status =
 428                             acpi_gbl_op_type_dispatch[op_type] (walk_state);
 429                 } else {
 430                         /*
 431                          * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
 432                          * Local is uninitialized.
 433                          */
 434                         if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 435                             (walk_state->opcode == AML_STORE_OP) &&
 436                             (walk_state->operands[0]->common.type ==
 437                              ACPI_TYPE_LOCAL_REFERENCE)
 438                             && (walk_state->operands[1]->common.type ==
 439                                 ACPI_TYPE_LOCAL_REFERENCE)
 440                             && (walk_state->operands[0]->reference.opcode ==
 441                                 walk_state->operands[1]->reference.opcode)
 442                             && (walk_state->operands[0]->reference.offset ==
 443                                 walk_state->operands[1]->reference.offset)) {
 444                                 status = AE_OK;
 445                         } else {
 446                                 ACPI_EXCEPTION((AE_INFO, status,
 447                                                 "While resolving operands for [%s]",
 448                                                 acpi_ps_get_opcode_name
 449                                                 (walk_state->opcode)));
 450                         }
 451                 }
 452
 453                 /* Always delete the argument objects and clear the operand stack */
 454
 455                 acpi_ds_clear_operands(walk_state);
 456
 457                 /*
 458                  * If a result object was returned from above, push it on the
 459                  * current result stack
 460                  */
 461                 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
 462                         status =
 463                             acpi_ds_result_push(walk_state->result_obj,
 464                                                 walk_state);
 465                 }
 466                 break;
 467
 468         default:
 469
 470                 switch (op_type) {
 471                 case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 472
 473                         /* 1 Operand, 0 external_result, 0 internal_result */
 474
 475                         status = acpi_ds_exec_end_control_op(walk_state, op);
 476
 477                         break;
 478
 479                 case AML_TYPE_METHOD_CALL:
 480
 481                         /*
 482                          * If the method is referenced from within a package
 483                          * declaration, it is not a invocation of the method, just
 484                          * a reference to it.
 485                          */
 486                         if ((op->asl.parent) &&
 487                             ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
 488                              || (op->asl.parent->asl.aml_opcode ==
 489                                  AML_VAR_PACKAGE_OP))) {
 490                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 491                                                   "Method Reference in a Package, Op=%p\n",
 492                                                   op));
 493
 494                                 op->common.node =
 495                                     (struct acpi_namespace_node *)op->asl.value.
 496                                     arg->asl.node->object;
 497                                 acpi_ut_add_reference(op->asl.value.arg->asl.
 498                                                       node->object);
 499                                 return_ACPI_STATUS(AE_OK);
 500                         }
 501
 502                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 503                                           "Method invocation, Op=%p\n", op));
 504
 505                         /*
 506                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
 507                          * the method Node pointer
 508                          */
 509                         /* next_op points to the op that holds the method name */
 510
 511                         next_op = first_arg;
 512
 513                         /* next_op points to first argument op */
 514
 515                         next_op = next_op->common.next;
 516
 517                         /*
 518                          * Get the method's arguments and put them on the operand stack
 519                          */
 520                         status = acpi_ds_create_operands(walk_state, next_op);
 521                         if (ACPI_FAILURE(status)) {
 522                                 break;
 523                         }
 524
 525                         /*
 526                          * Since the operands will be passed to another control method,
 527                          * we must resolve all local references here (Local variables,
 528                          * arguments to *this* method, etc.)
 529                          */
 530                         status = acpi_ds_resolve_operands(walk_state);
 531                         if (ACPI_FAILURE(status)) {
 532
 533                                 /* On error, clear all resolved operands */
 534
 535                                 acpi_ds_clear_operands(walk_state);
 536                                 break;
 537                         }
 538
 539                         /*
 540                          * Tell the walk loop to preempt this running method and
 541                          * execute the new method
 542                          */
 543                         status = AE_CTRL_TRANSFER;
 544
 545                         /*
 546                          * Return now; we don't want to disturb anything,
 547                          * especially the operand count!
 548                          */
 549                         return_ACPI_STATUS(status);
 550
 551                 case AML_TYPE_CREATE_FIELD:
 552
 553                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 554                                           "Executing CreateField Buffer/Index Op=%p\n",
 555                                           op));
 556
 557                         status = acpi_ds_load2_end_op(walk_state);
 558                         if (ACPI_FAILURE(status)) {
 559                                 break;
 560                         }
 561
 562                         status =
 563                             acpi_ds_eval_buffer_field_operands(walk_state, op);
 564                         break;
 565
 566                 case AML_TYPE_CREATE_OBJECT:
 567
 568                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 569                                           "Executing CreateObject (Buffer/Package) Op=%p\n",
 570                                           op));
 571
 572                         switch (op->common.parent->common.aml_opcode) {
 573                         case AML_NAME_OP:
 574
 575                                 /*
 576                                  * Put the Node on the object stack (Contains the ACPI Name
 577                                  * of this object)
 578                                  */
 579                                 walk_state->operands[0] =
 580                                     (void *)op->common.parent->common.node;
 581                                 walk_state->num_operands = 1;
 582
 583                                 status = acpi_ds_create_node(walk_state,
 584                                                              op->common.parent->
 585                                                              common.node,
 586                                                              op->common.parent);
 587                                 if (ACPI_FAILURE(status)) {
 588                                         break;
 589                                 }
 590
 591                                 /* Fall through */
 592                                 /*lint -fallthrough */
 593
 594                         case AML_INT_EVAL_SUBTREE_OP:
 595
 596                                 status =
 597                                     acpi_ds_eval_data_object_operands
 598                                     (walk_state, op,
 599                                      acpi_ns_get_attached_object(op->common.
 600                                                                  parent->common.
 601                                                                  node));
 602                                 break;
 603
 604                         default:
 605
 606                                 status =
 607                                     acpi_ds_eval_data_object_operands
 608                                     (walk_state, op, NULL);
 609                                 break;
 610                         }
 611
 612                         /*
 613                          * If a result object was returned from above, push it on the
 614                          * current result stack
 615                          */
 616                         if (walk_state->result_obj) {
 617                                 status =
 618                                     acpi_ds_result_push(walk_state->result_obj,
 619                                                         walk_state);
 620                         }
 621                         break;
 622
 623                 case AML_TYPE_NAMED_FIELD:
 624                 case AML_TYPE_NAMED_COMPLEX:
 625                 case AML_TYPE_NAMED_SIMPLE:
 626                 case AML_TYPE_NAMED_NO_OBJ:
 627
 628                         status = acpi_ds_load2_end_op(walk_state);
 629                         if (ACPI_FAILURE(status)) {
 630                                 break;
 631                         }
 632
 633                         if (op->common.aml_opcode == AML_REGION_OP) {
 634                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 635                                                   "Executing OpRegion Address/Length Op=%p\n",
 636                                                   op));
 637
 638                                 status =
 639                                     acpi_ds_eval_region_operands(walk_state,
 640                                                                  op);
 641                                 if (ACPI_FAILURE(status)) {
 642                                         break;
 643                                 }
 644                         }
 645                         break;
 646
 647                 case AML_TYPE_UNDEFINED:
 648
 649                         ACPI_ERROR((AE_INFO,
 650                                     "Undefined opcode type Op=%p", op));
 651                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 652
 653                 case AML_TYPE_BOGUS:
 654
 655                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 656                                           "Internal opcode=%X type Op=%p\n",
 657                                           walk_state->opcode, op));
 658                         break;
 659
 660                 default:
 661
 662                         ACPI_ERROR((AE_INFO,
 663                                     "Unimplemented opcode, class=%X type=%X Opcode=%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         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_DEBUGGER_EXEC(acpi_db_display_result_object
 700                                    (walk_state->result_obj, 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 }