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 - 2005, 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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acparser.h>
  48 #include <acpi/amlcode.h>
  49 #include <acpi/acdispat.h>
  50 #include <acpi/acinterp.h>
  51 #include <acpi/acnamesp.h>
  52 #include <acpi/acdebug.h>
  53 #include <acpi/acdisasm.h>
  54
  55
  56 #define _COMPONENT          ACPI_DISPATCHER
  57          ACPI_MODULE_NAME    ("dswexec")
  58
  59 /*
  60  * Dispatch table for opcode classes
  61  */
  62 static ACPI_EXECUTE_OP      acpi_gbl_op_type_dispatch [] = {
  63                           acpi_ex_opcode_0A_0T_1R,
  64                           acpi_ex_opcode_1A_0T_0R,
  65                           acpi_ex_opcode_1A_0T_1R,
  66                           acpi_ex_opcode_1A_1T_0R,
  67                           acpi_ex_opcode_1A_1T_1R,
  68                           acpi_ex_opcode_2A_0T_0R,
  69                           acpi_ex_opcode_2A_0T_1R,
  70                           acpi_ex_opcode_2A_1T_1R,
  71                           acpi_ex_opcode_2A_2T_1R,
  72                           acpi_ex_opcode_3A_0T_0R,
  73                           acpi_ex_opcode_3A_1T_1R,
  74                           acpi_ex_opcode_6A_0T_1R};
  75
  76 /*****************************************************************************
  77  *
  78  * FUNCTION:    acpi_ds_get_predicate_value
  79  *
  80  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  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 (
  90         struct acpi_walk_state          *walk_state,
  91         union acpi_operand_object       *result_obj) {
  92         acpi_status                     status = AE_OK;
  93         union acpi_operand_object       *obj_desc;
  94         union acpi_operand_object       *local_obj_desc = NULL;
  95
  96
  97         ACPI_FUNCTION_TRACE_PTR ("ds_get_predicate_value", walk_state);
  98
  99
 100         walk_state->control_state->common.state = 0;
 101
 102         if (result_obj) {
 103                 status = acpi_ds_result_pop (&obj_desc, walk_state);
 104                 if (ACPI_FAILURE (status)) {
 105                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 106                                 "Could not get result from predicate evaluation, %s\n",
 107                                 acpi_format_exception (status)));
 108
 109                         return_ACPI_STATUS (status);
 110                 }
 111         }
 112         else {
 113                 status = acpi_ds_create_operand (walk_state, walk_state->op, 0);
 114                 if (ACPI_FAILURE (status)) {
 115                         return_ACPI_STATUS (status);
 116                 }
 117
 118                 status = acpi_ex_resolve_to_value (&walk_state->operands [0], walk_state);
 119                 if (ACPI_FAILURE (status)) {
 120                         return_ACPI_STATUS (status);
 121                 }
 122
 123                 obj_desc = walk_state->operands [0];
 124         }
 125
 126         if (!obj_desc) {
 127                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No predicate obj_desc=%p State=%p\n",
 128                         obj_desc, walk_state));
 129
 130                 return_ACPI_STATUS (AE_AML_NO_OPERAND);
 131         }
 132
 133         /*
 134          * Result of predicate evaluation must be an Integer
 135          * object. Implicitly convert the argument if necessary.
 136          */
 137         status = acpi_ex_convert_to_integer (obj_desc, &local_obj_desc, 16);
 138         if (ACPI_FAILURE (status)) {
 139                 goto cleanup;
 140         }
 141
 142         if (ACPI_GET_OBJECT_TYPE (local_obj_desc) != ACPI_TYPE_INTEGER) {
 143                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 144                         "Bad predicate (not an integer) obj_desc=%p State=%p Type=%X\n",
 145                         obj_desc, walk_state, ACPI_GET_OBJECT_TYPE (obj_desc)));
 146
 147                 status = AE_AML_OPERAND_TYPE;
 148                 goto cleanup;
 149         }
 150
 151         /* Truncate the predicate to 32-bits if necessary */
 152
 153         acpi_ex_truncate_for32bit_table (local_obj_desc);
 154
 155         /*
 156          * Save the result of the predicate evaluation on
 157          * the control stack
 158          */
 159         if (local_obj_desc->integer.value) {
 160                 walk_state->control_state->common.value = TRUE;
 161         }
 162         else {
 163                 /*
 164                  * Predicate is FALSE, we will just toss the
 165                  * rest of the package
 166                  */
 167                 walk_state->control_state->common.value = FALSE;
 168                 status = AE_CTRL_FALSE;
 169         }
 170
 171
 172 cleanup:
 173
 174         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
 175                 walk_state->control_state->common.value, walk_state->op));
 176
 177          /* Break to debugger to display result */
 178
 179         ACPI_DEBUGGER_EXEC (acpi_db_display_result_object (local_obj_desc, walk_state));
 180
 181         /*
 182          * Delete the predicate result object (we know that
 183          * we don't need it anymore)
 184          */
 185         if (local_obj_desc != obj_desc) {
 186                 acpi_ut_remove_reference (local_obj_desc);
 187         }
 188         acpi_ut_remove_reference (obj_desc);
 189
 190         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
 191         return_ACPI_STATUS (status);
 192 }
 193
 194
 195 /*****************************************************************************
 196  *
 197  * FUNCTION:    acpi_ds_exec_begin_op
 198  *
 199  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 200  *              out_op          - Return op if a new one is created
 201  *
 202  * RETURN:      Status
 203  *
 204  * DESCRIPTION: Descending callback used during the execution of control
 205  *              methods.  This is where most operators and operands are
 206  *              dispatched to the interpreter.
 207  *
 208  ****************************************************************************/
 209
 210 acpi_status
 211 acpi_ds_exec_begin_op (
 212         struct acpi_walk_state          *walk_state,
 213         union acpi_parse_object         **out_op)
 214 {
 215         union acpi_parse_object         *op;
 216         acpi_status                     status = AE_OK;
 217         u32                             opcode_class;
 218
 219
 220         ACPI_FUNCTION_TRACE_PTR ("ds_exec_begin_op", walk_state);
 221
 222
 223         op = walk_state->op;
 224         if (!op) {
 225                 status = acpi_ds_load2_begin_op (walk_state, out_op);
 226                 if (ACPI_FAILURE (status)) {
 227                         return_ACPI_STATUS (status);
 228                 }
 229
 230                 op = *out_op;
 231                 walk_state->op = op;
 232                 walk_state->opcode = op->common.aml_opcode;
 233                 walk_state->op_info = 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, "(%s) Popping scope for Op %p\n",
 237                                 acpi_ut_get_type_name (walk_state->op_info->object_type), op));
 238
 239                         status = acpi_ds_scope_stack_pop (walk_state);
 240                         if (ACPI_FAILURE (status)) {
 241                                 return_ACPI_STATUS (status);
 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, "Exec predicate Op=%p State=%p\n",
 263                                   op, walk_state));
 264
 265                 walk_state->control_state->common.state = ACPI_CONTROL_PREDICATE_EXECUTING;
 266
 267                 /* Save start of predicate */
 268
 269                 walk_state->control_state->control.predicate_op = op;
 270         }
 271
 272
 273         opcode_class = walk_state->op_info->class;
 274
 275         /* We want to send namepaths to the load code */
 276
 277         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 278                 opcode_class = AML_CLASS_NAMED_OBJECT;
 279         }
 280
 281         /*
 282          * Handle the opcode based upon the opcode type
 283          */
 284         switch (opcode_class) {
 285         case AML_CLASS_CONTROL:
 286
 287                 status = acpi_ds_result_stack_push (walk_state);
 288                 if (ACPI_FAILURE (status)) {
 289                         return_ACPI_STATUS (status);
 290                 }
 291
 292                 status = acpi_ds_exec_begin_control_op (walk_state, op);
 293                 break;
 294
 295
 296         case AML_CLASS_NAMED_OBJECT:
 297
 298                 if (walk_state->walk_type == ACPI_WALK_METHOD) {
 299                         /*
 300                          * Found a named object declaration during method
 301                          * execution;  we must enter this object into the
 302                          * namespace.  The created object is temporary and
 303                          * will be deleted upon completion of the execution
 304                          * of this method.
 305                          */
 306                         status = acpi_ds_load2_begin_op (walk_state, NULL);
 307                 }
 308
 309                 if (op->common.aml_opcode == AML_REGION_OP) {
 310                         status = acpi_ds_result_stack_push (walk_state);
 311                 }
 312                 break;
 313
 314
 315         case AML_CLASS_EXECUTE:
 316         case AML_CLASS_CREATE:
 317
 318                 /*
 319                  * Most operators with arguments.
 320                  * Start a new result/operand state
 321                  */
 322                 status = acpi_ds_result_stack_push (walk_state);
 323                 break;
 324
 325
 326         default:
 327                 break;
 328         }
 329
 330         /* Nothing to do here during method execution */
 331
 332         return_ACPI_STATUS (status);
 333 }
 334
 335
 336 /*****************************************************************************
 337  *
 338  * FUNCTION:    acpi_ds_exec_end_op
 339  *
 340  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 341  *              Op              - Op that has been just been completed in the
 342  *                                walk;  Arguments have now been evaluated.
 343  *
 344  * RETURN:      Status
 345  *
 346  * DESCRIPTION: Ascending callback used during the execution of control
 347  *              methods.  The only thing we really need to do here is to
 348  *              notice the beginning of IF, ELSE, and WHILE blocks.
 349  *
 350  ****************************************************************************/
 351
 352 acpi_status
 353 acpi_ds_exec_end_op (
 354         struct acpi_walk_state          *walk_state)
 355 {
 356         union acpi_parse_object         *op;
 357         acpi_status                     status = AE_OK;
 358         u32                             op_type;
 359         u32                             op_class;
 360         union acpi_parse_object         *next_op;
 361         union acpi_parse_object         *first_arg;
 362
 363
 364         ACPI_FUNCTION_TRACE_PTR ("ds_exec_end_op", walk_state);
 365
 366
 367         op      = walk_state->op;
 368         op_type = walk_state->op_info->type;
 369         op_class = walk_state->op_info->class;
 370
 371         if (op_class == AML_CLASS_UNKNOWN) {
 372                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown opcode %X\n", op->common.aml_opcode));
 373                 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
 374         }
 375
 376         first_arg = op->common.value.arg;
 377
 378         /* Init the walk state */
 379
 380         walk_state->num_operands = 0;
 381         walk_state->return_desc = NULL;
 382         walk_state->result_obj = NULL;
 383
 384         /* Call debugger for single step support (DEBUG build only) */
 385
 386         ACPI_DEBUGGER_EXEC (status = acpi_db_single_step (walk_state, op, op_class));
 387         ACPI_DEBUGGER_EXEC (if (ACPI_FAILURE (status)) {return_ACPI_STATUS (status);});
 388
 389         /* Decode the Opcode Class */
 390
 391         switch (op_class) {
 392         case AML_CLASS_ARGUMENT:    /* constants, literals, etc. -- do nothing */
 393                 break;
 394
 395
 396         case AML_CLASS_EXECUTE:     /* most operators with arguments */
 397
 398                 /* Build resolved operand stack */
 399
 400                 status = acpi_ds_create_operands (walk_state, first_arg);
 401                 if (ACPI_FAILURE (status)) {
 402                         goto cleanup;
 403                 }
 404
 405                 /* Done with this result state (Now that operand stack is built) */
 406
 407                 status = acpi_ds_result_stack_pop (walk_state);
 408                 if (ACPI_FAILURE (status)) {
 409                         goto cleanup;
 410                 }
 411
 412                 /*
 413                  * All opcodes require operand resolution, with the only exceptions
 414                  * being the object_type and size_of operators.
 415                  */
 416                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
 417                         /* Resolve all operands */
 418
 419                         status = acpi_ex_resolve_operands (walk_state->opcode,
 420                                           &(walk_state->operands [walk_state->num_operands -1]),
 421                                           walk_state);
 422                         if (ACPI_SUCCESS (status)) {
 423                                 ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
 424                                                   acpi_ps_get_opcode_name (walk_state->opcode),
 425                                                   walk_state->num_operands, "after ex_resolve_operands");
 426                         }
 427                 }
 428
 429                 if (ACPI_SUCCESS (status)) {
 430                         /*
 431                          * Dispatch the request to the appropriate interpreter handler
 432                          * routine.  There is one routine per opcode "type" based upon the
 433                          * number of opcode arguments and return type.
 434                          */
 435                         status = acpi_gbl_op_type_dispatch[op_type] (walk_state);
 436                 }
 437                 else {
 438                         /*
 439                          * Treat constructs of the form "Store(local_x,local_x)" as noops when the
 440                          * Local is uninitialized.
 441                          */
 442                         if  ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 443                                 (walk_state->opcode == AML_STORE_OP) &&
 444                                 (walk_state->operands[0]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
 445                                 (walk_state->operands[1]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
 446                                 (walk_state->operands[0]->reference.opcode ==
 447                                  walk_state->operands[1]->reference.opcode) &&
 448                                 (walk_state->operands[0]->reference.offset ==
 449                                  walk_state->operands[1]->reference.offset)) {
 450                                 status = AE_OK;
 451                         }
 452                         else {
 453                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 454                                         "[%s]: Could not resolve operands, %s\n",
 455                                         acpi_ps_get_opcode_name (walk_state->opcode),
 456                                         acpi_format_exception (status)));
 457                         }
 458                 }
 459
 460                 /* Always delete the argument objects and clear the operand stack */
 461
 462                 acpi_ds_clear_operands (walk_state);
 463
 464                 /*
 465                  * If a result object was returned from above, push it on the
 466                  * current result stack
 467                  */
 468                 if (ACPI_SUCCESS (status) &&
 469                         walk_state->result_obj) {
 470                         status = acpi_ds_result_push (walk_state->result_obj, walk_state);
 471                 }
 472
 473                 break;
 474
 475
 476         default:
 477
 478                 switch (op_type) {
 479                 case AML_TYPE_CONTROL:    /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 480
 481                         /* 1 Operand, 0 external_result, 0 internal_result */
 482
 483                         status = acpi_ds_exec_end_control_op (walk_state, op);
 484
 485                         /* Make sure to properly pop the result stack */
 486
 487                         if (ACPI_SUCCESS (status)) {
 488                                 status = acpi_ds_result_stack_pop (walk_state);
 489                         }
 490                         else if (status == AE_CTRL_PENDING) {
 491                                 status = acpi_ds_result_stack_pop (walk_state);
 492                                 if (ACPI_SUCCESS (status)) {
 493                                         status = AE_CTRL_PENDING;
 494                                 }
 495                         }
 496                         break;
 497
 498
 499                 case AML_TYPE_METHOD_CALL:
 500
 501                         /*
 502                          * If the method is referenced from within a package
 503                          * declaration, it is not a invocation of the method, just
 504                          * a reference to it.
 505                          */
 506                         if ((op->asl.parent) &&
 507                            ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP) ||
 508                                 (op->asl.parent->asl.aml_opcode == AML_VAR_PACKAGE_OP))) {
 509                                 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method Reference in a Package, Op=%p\n", op));
 510                                 op->common.node = (struct acpi_namespace_node *) op->asl.value.arg->asl.node->object;
 511                                 acpi_ut_add_reference (op->asl.value.arg->asl.node->object);
 512                                 return_ACPI_STATUS (AE_OK);
 513                         }
 514
 515                         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method invocation, Op=%p\n", op));
 516
 517                         /*
 518                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
 519                          * the method Node pointer
 520                          */
 521                         /* next_op points to the op that holds the method name */
 522
 523                         next_op = first_arg;
 524
 525                         /* next_op points to first argument op */
 526
 527                         next_op = next_op->common.next;
 528
 529                         /*
 530                          * Get the method's arguments and put them on the operand stack
 531                          */
 532                         status = acpi_ds_create_operands (walk_state, next_op);
 533                         if (ACPI_FAILURE (status)) {
 534                                 break;
 535                         }
 536
 537                         /*
 538                          * Since the operands will be passed to another control method,
 539                          * we must resolve all local references here (Local variables,
 540                          * arguments to *this* method, etc.)
 541                          */
 542                         status = acpi_ds_resolve_operands (walk_state);
 543                         if (ACPI_FAILURE (status)) {
 544                                 /* On error, clear all resolved operands */
 545
 546                                 acpi_ds_clear_operands (walk_state);
 547                                 break;
 548                         }
 549
 550                         /*
 551                          * Tell the walk loop to preempt this running method and
 552                          * execute the new method
 553                          */
 554                         status = AE_CTRL_TRANSFER;
 555
 556                         /*
 557                          * Return now; we don't want to disturb anything,
 558                          * especially the operand count!
 559                          */
 560                         return_ACPI_STATUS (status);
 561
 562
 563                 case AML_TYPE_CREATE_FIELD:
 564
 565                         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 566                                 "Executing create_field Buffer/Index Op=%p\n", op));
 567
 568                         status = acpi_ds_load2_end_op (walk_state);
 569                         if (ACPI_FAILURE (status)) {
 570                                 break;
 571                         }
 572
 573                         status = acpi_ds_eval_buffer_field_operands (walk_state, op);
 574                         break;
 575
 576
 577                 case AML_TYPE_CREATE_OBJECT:
 578
 579                         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 580                                 "Executing create_object (Buffer/Package) Op=%p\n", op));
 581
 582                         switch (op->common.parent->common.aml_opcode) {
 583                         case AML_NAME_OP:
 584
 585                                 /*
 586                                  * Put the Node on the object stack (Contains the ACPI Name of
 587                                  * this object)
 588                                  */
 589                                 walk_state->operands[0] = (void *) op->common.parent->common.node;
 590                                 walk_state->num_operands = 1;
 591
 592                                 status = acpi_ds_create_node (walk_state, op->common.parent->common.node, op->common.parent);
 593                                 if (ACPI_FAILURE (status)) {
 594                                         break;
 595                                 }
 596
 597                                 /* Fall through */
 598                                 /*lint -fallthrough */
 599
 600                         case AML_INT_EVAL_SUBTREE_OP:
 601
 602                                 status = acpi_ds_eval_data_object_operands (walk_state, op,
 603                                                   acpi_ns_get_attached_object (op->common.parent->common.node));
 604                                 break;
 605
 606                         default:
 607
 608                                 status = acpi_ds_eval_data_object_operands (walk_state, op, NULL);
 609                                 break;
 610                         }
 611
 612                         /* Done with this result state (Now that operand stack is built) */
 613
 614                         status = acpi_ds_result_stack_pop (walk_state);
 615                         if (ACPI_FAILURE (status)) {
 616                                 goto cleanup;
 617                         }
 618
 619                         /*
 620                          * If a result object was returned from above, push it on the
 621                          * current result stack
 622                          */
 623                         if (ACPI_SUCCESS (status) &&
 624                                 walk_state->result_obj) {
 625                                 status = acpi_ds_result_push (walk_state->result_obj, walk_state);
 626                         }
 627                         break;
 628
 629
 630                 case AML_TYPE_NAMED_FIELD:
 631                 case AML_TYPE_NAMED_COMPLEX:
 632                 case AML_TYPE_NAMED_SIMPLE:
 633                 case AML_TYPE_NAMED_NO_OBJ:
 634
 635                         status = acpi_ds_load2_end_op (walk_state);
 636                         if (ACPI_FAILURE (status)) {
 637                                 break;
 638                         }
 639
 640                         if (op->common.aml_opcode == AML_REGION_OP) {
 641                                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 642                                         "Executing op_region Address/Length Op=%p\n", op));
 643
 644                                 status = acpi_ds_eval_region_operands (walk_state, op);
 645                                 if (ACPI_FAILURE (status)) {
 646                                         break;
 647                                 }
 648
 649                                 status = acpi_ds_result_stack_pop (walk_state);
 650                         }
 651
 652                         break;
 653
 654
 655                 case AML_TYPE_UNDEFINED:
 656
 657                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Undefined opcode type Op=%p\n", op));
 658                         return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
 659
 660
 661                 case AML_TYPE_BOGUS:
 662
 663                         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 664                                 "Internal opcode=%X type Op=%p\n",
 665                                 walk_state->opcode, op));
 666                         break;
 667
 668
 669                 default:
 670
 671                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 672                                 "Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p\n",
 673                                 op_class, op_type, op->common.aml_opcode, op));
 674
 675                         status = AE_NOT_IMPLEMENTED;
 676                         break;
 677                 }
 678         }
 679
 680         /*
 681          * ACPI 2.0 support for 64-bit integers: Truncate numeric
 682          * result value if we are executing from a 32-bit ACPI table
 683          */
 684         acpi_ex_truncate_for32bit_table (walk_state->result_obj);
 685
 686         /*
 687          * Check if we just completed the evaluation of a
 688          * conditional predicate
 689          */
 690
 691         if ((ACPI_SUCCESS (status)) &&
 692                 (walk_state->control_state) &&
 693                 (walk_state->control_state->common.state ==
 694                         ACPI_CONTROL_PREDICATE_EXECUTING) &&
 695                 (walk_state->control_state->control.predicate_op == op)) {
 696                 status = acpi_ds_get_predicate_value (walk_state, walk_state->result_obj);
 697                 walk_state->result_obj = NULL;
 698         }
 699
 700
 701 cleanup:
 702
 703         /* Invoke exception handler on error */
 704
 705         if (ACPI_FAILURE (status) &&
 706                 acpi_gbl_exception_handler &&
 707                 !(status & AE_CODE_CONTROL)) {
 708                 acpi_ex_exit_interpreter ();
 709                 status = acpi_gbl_exception_handler (status,
 710                                  walk_state->method_node->name.integer, walk_state->opcode,
 711                                  walk_state->aml_offset, NULL);
 712                 acpi_ex_enter_interpreter ();
 713         }
 714
 715         if (walk_state->result_obj) {
 716                 /* Break to debugger to display result */
 717
 718                 ACPI_DEBUGGER_EXEC (acpi_db_display_result_object (walk_state->result_obj, walk_state));
 719
 720                 /*
 721                  * Delete the result op if and only if:
 722                  * Parent will not use the result -- such as any
 723                  * non-nested type2 op in a method (parent will be method)
 724                  */
 725                 acpi_ds_delete_result_if_not_used (op, walk_state->result_obj, walk_state);
 726         }
 727
 728 #ifdef _UNDER_DEVELOPMENT
 729
 730         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
 731                 acpi_db_method_end (walk_state);
 732         }
 733 #endif
 734
 735         /* Always clear the object stack */
 736
 737         walk_state->num_operands = 0;
 738
 739 #ifdef ACPI_DISASSEMBLER
 740
 741         /* On error, display method locals/args */
 742
 743         if (ACPI_FAILURE (status)) {
 744                 acpi_dm_dump_method_info (status, walk_state, op);
 745         }
 746 #endif
 747
 748         return_ACPI_STATUS (status);
 749 }
 750
 751