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  *
  79  * FUNCTION:    acpi_ds_get_predicate_value
  80  *
  81  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  82  *              result_obj      - if non-zero, pop result from result stack
  83  *
  84  * RETURN:      Status
  85  *
  86  * DESCRIPTION: Get the result of a predicate evaluation
  87  *
  88  ****************************************************************************/
  89
  90 acpi_status
  91 acpi_ds_get_predicate_value (
  92         struct acpi_walk_state          *walk_state,
  93         union acpi_operand_object       *result_obj) {
  94         acpi_status                     status = AE_OK;
  95         union acpi_operand_object       *obj_desc;
  96         union acpi_operand_object       *local_obj_desc = NULL;
  97
  98
  99         ACPI_FUNCTION_TRACE_PTR ("ds_get_predicate_value", walk_state);
 100
 101
 102         walk_state->control_state->common.state = 0;
 103
 104         if (result_obj) {
 105                 status = acpi_ds_result_pop (&obj_desc, walk_state);
 106                 if (ACPI_FAILURE (status)) {
 107                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 108                                 "Could not get result from predicate evaluation, %s\n",
 109                                 acpi_format_exception (status)));
 110
 111                         return_ACPI_STATUS (status);
 112                 }
 113         }
 114         else {
 115                 status = acpi_ds_create_operand (walk_state, walk_state->op, 0);
 116                 if (ACPI_FAILURE (status)) {
 117                         return_ACPI_STATUS (status);
 118                 }
 119
 120                 status = acpi_ex_resolve_to_value (&walk_state->operands [0], walk_state);
 121                 if (ACPI_FAILURE (status)) {
 122                         return_ACPI_STATUS (status);
 123                 }
 124
 125                 obj_desc = walk_state->operands [0];
 126         }
 127
 128         if (!obj_desc) {
 129                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 130                         "No predicate obj_desc=%p State=%p\n",
 131                         obj_desc, walk_state));
 132
 133                 return_ACPI_STATUS (AE_AML_NO_OPERAND);
 134         }
 135
 136         /*
 137          * Result of predicate evaluation must be an Integer
 138          * object. Implicitly convert the argument if necessary.
 139          */
 140         status = acpi_ex_convert_to_integer (obj_desc, &local_obj_desc, 16);
 141         if (ACPI_FAILURE (status)) {
 142                 goto cleanup;
 143         }
 144
 145         if (ACPI_GET_OBJECT_TYPE (local_obj_desc) != ACPI_TYPE_INTEGER) {
 146                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 147                         "Bad predicate (not an integer) obj_desc=%p State=%p Type=%X\n",
 148                         obj_desc, walk_state, ACPI_GET_OBJECT_TYPE (obj_desc)));
 149
 150                 status = AE_AML_OPERAND_TYPE;
 151                 goto cleanup;
 152         }
 153
 154         /* Truncate the predicate to 32-bits if necessary */
 155
 156         acpi_ex_truncate_for32bit_table (local_obj_desc);
 157
 158         /*
 159          * Save the result of the predicate evaluation on
 160          * the control stack
 161          */
 162         if (local_obj_desc->integer.value) {
 163                 walk_state->control_state->common.value = TRUE;
 164         }
 165         else {
 166                 /*
 167                  * Predicate is FALSE, we will just toss the
 168                  * rest of the package
 169                  */
 170                 walk_state->control_state->common.value = FALSE;
 171                 status = AE_CTRL_FALSE;
 172         }
 173
 174
 175 cleanup:
 176
 177         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
 178                 walk_state->control_state->common.value, walk_state->op));
 179
 180          /* Break to debugger to display result */
 181
 182         ACPI_DEBUGGER_EXEC (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  *
 200  * FUNCTION:    acpi_ds_exec_begin_op
 201  *
 202  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 203  *              out_op          - Where to return op if a new one is created
 204  *
 205  * RETURN:      Status
 206  *
 207  * DESCRIPTION: Descending callback used during the execution of control
 208  *              methods.  This is where most operators and operands are
 209  *              dispatched to the interpreter.
 210  *
 211  ****************************************************************************/
 212
 213 acpi_status
 214 acpi_ds_exec_begin_op (
 215         struct acpi_walk_state          *walk_state,
 216         union acpi_parse_object         **out_op)
 217 {
 218         union acpi_parse_object         *op;
 219         acpi_status                     status = AE_OK;
 220         u32                             opcode_class;
 221
 222
 223         ACPI_FUNCTION_TRACE_PTR ("ds_exec_begin_op", walk_state);
 224
 225
 226         op = walk_state->op;
 227         if (!op) {
 228                 status = acpi_ds_load2_begin_op (walk_state, out_op);
 229                 if (ACPI_FAILURE (status)) {
 230                         return_ACPI_STATUS (status);
 231                 }
 232
 233                 op = *out_op;
 234                 walk_state->op = op;
 235                 walk_state->opcode = op->common.aml_opcode;
 236                 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
 237
 238                 if (acpi_ns_opens_scope (walk_state->op_info->object_type)) {
 239                         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 240                                 "(%s) Popping scope for Op %p\n",
 241                                 acpi_ut_get_type_name (walk_state->op_info->object_type), op));
 242
 243                         status = acpi_ds_scope_stack_pop (walk_state);
 244                         if (ACPI_FAILURE (status)) {
 245                                 return_ACPI_STATUS (status);
 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, "Exec predicate Op=%p State=%p\n",
 267                                   op, walk_state));
 268
 269                 walk_state->control_state->common.state = ACPI_CONTROL_PREDICATE_EXECUTING;
 270
 271                 /* Save start of predicate */
 272
 273                 walk_state->control_state->control.predicate_op = op;
 274         }
 275
 276
 277         opcode_class = walk_state->op_info->class;
 278
 279         /* We want to send namepaths to the load code */
 280
 281         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 282                 opcode_class = AML_CLASS_NAMED_OBJECT;
 283         }
 284
 285         /*
 286          * Handle the opcode based upon the opcode type
 287          */
 288         switch (opcode_class) {
 289         case AML_CLASS_CONTROL:
 290
 291                 status = acpi_ds_result_stack_push (walk_state);
 292                 if (ACPI_FAILURE (status)) {
 293                         return_ACPI_STATUS (status);
 294                 }
 295
 296                 status = acpi_ds_exec_begin_control_op (walk_state, op);
 297                 break;
 298
 299
 300         case AML_CLASS_NAMED_OBJECT:
 301
 302                 if (walk_state->walk_type == ACPI_WALK_METHOD) {
 303                         /*
 304                          * Found a named object declaration during method execution;
 305                          * we must enter this object into the namespace.  The created
 306                          * object is temporary and will be deleted upon completion of
 307                          * the execution of this method.
 308                          */
 309                         status = acpi_ds_load2_begin_op (walk_state, NULL);
 310                 }
 311
 312                 if (op->common.aml_opcode == AML_REGION_OP) {
 313                         status = acpi_ds_result_stack_push (walk_state);
 314                 }
 315                 break;
 316
 317
 318         case AML_CLASS_EXECUTE:
 319         case AML_CLASS_CREATE:
 320
 321                 /*
 322                  * Most operators with arguments.
 323                  * Start a new result/operand state
 324                  */
 325                 status = acpi_ds_result_stack_push (walk_state);
 326                 break;
 327
 328
 329         default:
 330                 break;
 331         }
 332
 333         /* Nothing to do here during method execution */
 334
 335         return_ACPI_STATUS (status);
 336 }
 337
 338
 339 /*****************************************************************************
 340  *
 341  * FUNCTION:    acpi_ds_exec_end_op
 342  *
 343  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 344  *
 345  * RETURN:      Status
 346  *
 347  * DESCRIPTION: Ascending callback used during the execution of control
 348  *              methods.  The only thing we really need to do here is to
 349  *              notice the beginning of IF, ELSE, and WHILE blocks.
 350  *
 351  ****************************************************************************/
 352
 353 acpi_status
 354 acpi_ds_exec_end_op (
 355         struct acpi_walk_state          *walk_state)
 356 {
 357         union acpi_parse_object         *op;
 358         acpi_status                     status = AE_OK;
 359         u32                             op_type;
 360         u32                             op_class;
 361         union acpi_parse_object         *next_op;
 362         union acpi_parse_object         *first_arg;
 363
 364
 365         ACPI_FUNCTION_TRACE_PTR ("ds_exec_end_op", walk_state);
 366
 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_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown opcode %X\n", op->common.aml_opcode));
 374                 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
 375         }
 376
 377         first_arg = op->common.value.arg;
 378
 379         /* Init the walk state */
 380
 381         walk_state->num_operands = 0;
 382         walk_state->return_desc = NULL;
 383         walk_state->result_obj = NULL;
 384
 385         /* Call debugger for single step support (DEBUG build only) */
 386
 387         ACPI_DEBUGGER_EXEC (status = acpi_db_single_step (walk_state, op, op_class));
 388         ACPI_DEBUGGER_EXEC (if (ACPI_FAILURE (status)) {return_ACPI_STATUS (status);});
 389
 390         /* Decode the Opcode Class */
 391
 392         switch (op_class) {
 393         case AML_CLASS_ARGUMENT:    /* constants, literals, etc. - do nothing */
 394                 break;
 395
 396
 397         case AML_CLASS_EXECUTE:     /* most operators with arguments */
 398
 399                 /* Build resolved operand stack */
 400
 401                 status = acpi_ds_create_operands (walk_state, first_arg);
 402                 if (ACPI_FAILURE (status)) {
 403                         goto cleanup;
 404                 }
 405
 406                 /* Done with this result state (Now that operand stack is built) */
 407
 408                 status = acpi_ds_result_stack_pop (walk_state);
 409                 if (ACPI_FAILURE (status)) {
 410                         goto cleanup;
 411                 }
 412
 413                 /*
 414                  * All opcodes require operand resolution, with the only exceptions
 415                  * being the object_type and size_of operators.
 416                  */
 417                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
 418                         /* Resolve all operands */
 419
 420                         status = acpi_ex_resolve_operands (walk_state->opcode,
 421                                          &(walk_state->operands [walk_state->num_operands -1]),
 422                                          walk_state);
 423                         if (ACPI_SUCCESS (status)) {
 424                                 ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
 425                                         acpi_ps_get_opcode_name (walk_state->opcode),
 426                                         walk_state->num_operands, "after ex_resolve_operands");
 427                         }
 428                 }
 429
 430                 if (ACPI_SUCCESS (status)) {
 431                         /*
 432                          * Dispatch the request to the appropriate interpreter handler
 433                          * routine.  There is one routine per opcode "type" based upon the
 434                          * number of opcode arguments and return type.
 435                          */
 436                         status = acpi_gbl_op_type_dispatch[op_type] (walk_state);
 437                 }
 438                 else {
 439                         /*
 440                          * Treat constructs of the form "Store(local_x,local_x)" as noops when the
 441                          * Local is uninitialized.
 442                          */
 443                         if  ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 444                                 (walk_state->opcode == AML_STORE_OP) &&
 445                                 (walk_state->operands[0]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
 446                                 (walk_state->operands[1]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
 447                                 (walk_state->operands[0]->reference.opcode ==
 448                                  walk_state->operands[1]->reference.opcode) &&
 449                                 (walk_state->operands[0]->reference.offset ==
 450                                  walk_state->operands[1]->reference.offset)) {
 451                                 status = AE_OK;
 452                         }
 453                         else {
 454                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 455                                         "[%s]: Could not resolve operands, %s\n",
 456                                         acpi_ps_get_opcode_name (walk_state->opcode),
 457                                         acpi_format_exception (status)));
 458                         }
 459                 }
 460
 461                 /* Always delete the argument objects and clear the operand stack */
 462
 463                 acpi_ds_clear_operands (walk_state);
 464
 465                 /*
 466                  * If a result object was returned from above, push it on the
 467                  * current result stack
 468                  */
 469                 if (ACPI_SUCCESS (status) &&
 470                         walk_state->result_obj) {
 471                         status = acpi_ds_result_push (walk_state->result_obj, walk_state);
 472                 }
 473
 474                 break;
 475
 476
 477         default:
 478
 479                 switch (op_type) {
 480                 case AML_TYPE_CONTROL:    /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 481
 482                         /* 1 Operand, 0 external_result, 0 internal_result */
 483
 484                         status = acpi_ds_exec_end_control_op (walk_state, op);
 485
 486                         /* Make sure to properly pop the result stack */
 487
 488                         if (ACPI_SUCCESS (status)) {
 489                                 status = acpi_ds_result_stack_pop (walk_state);
 490                         }
 491                         else if (status == AE_CTRL_PENDING) {
 492                                 status = acpi_ds_result_stack_pop (walk_state);
 493                                 if (ACPI_SUCCESS (status)) {
 494                                         status = AE_CTRL_PENDING;
 495                                 }
 496                         }
 497                         break;
 498
 499
 500                 case AML_TYPE_METHOD_CALL:
 501
 502                         /*
 503                          * If the method is referenced from within a package
 504                          * declaration, it is not a invocation of the method, just
 505                          * a reference to it.
 506                          */
 507                         if ((op->asl.parent) &&
 508                            ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP) ||
 509                                 (op->asl.parent->asl.aml_opcode == AML_VAR_PACKAGE_OP))) {
 510                                 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 511                                         "Method Reference in a Package, Op=%p\n", op));
 512                                 op->common.node = (struct acpi_namespace_node *) op->asl.value.arg->asl.node->object;
 513                                 acpi_ut_add_reference (op->asl.value.arg->asl.node->object);
 514                                 return_ACPI_STATUS (AE_OK);
 515                         }
 516
 517                         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method invocation, Op=%p\n", op));
 518
 519                         /*
 520                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
 521                          * the method Node pointer
 522                          */
 523                         /* next_op points to the op that holds the method name */
 524
 525                         next_op = first_arg;
 526
 527                         /* next_op points to first argument op */
 528
 529                         next_op = next_op->common.next;
 530
 531                         /*
 532                          * Get the method's arguments and put them on the operand stack
 533                          */
 534                         status = acpi_ds_create_operands (walk_state, next_op);
 535                         if (ACPI_FAILURE (status)) {
 536                                 break;
 537                         }
 538
 539                         /*
 540                          * Since the operands will be passed to another control method,
 541                          * we must resolve all local references here (Local variables,
 542                          * arguments to *this* method, etc.)
 543                          */
 544                         status = acpi_ds_resolve_operands (walk_state);
 545                         if (ACPI_FAILURE (status)) {
 546                                 /* On error, clear all resolved operands */
 547
 548                                 acpi_ds_clear_operands (walk_state);
 549                                 break;
 550                         }
 551
 552                         /*
 553                          * Tell the walk loop to preempt this running method and
 554                          * execute the new method
 555                          */
 556                         status = AE_CTRL_TRANSFER;
 557
 558                         /*
 559                          * Return now; we don't want to disturb anything,
 560                          * especially the operand count!
 561                          */
 562                         return_ACPI_STATUS (status);
 563
 564
 565                 case AML_TYPE_CREATE_FIELD:
 566
 567                         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 568                                 "Executing create_field Buffer/Index Op=%p\n", op));
 569
 570                         status = acpi_ds_load2_end_op (walk_state);
 571                         if (ACPI_FAILURE (status)) {
 572                                 break;
 573                         }
 574
 575                         status = acpi_ds_eval_buffer_field_operands (walk_state, op);
 576                         break;
 577
 578
 579                 case AML_TYPE_CREATE_OBJECT:
 580
 581                         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 582                                 "Executing create_object (Buffer/Package) Op=%p\n", op));
 583
 584                         switch (op->common.parent->common.aml_opcode) {
 585                         case AML_NAME_OP:
 586
 587                                 /*
 588                                  * Put the Node on the object stack (Contains the ACPI Name
 589                                  * of this object)
 590                                  */
 591                                 walk_state->operands[0] = (void *) op->common.parent->common.node;
 592                                 walk_state->num_operands = 1;
 593
 594                                 status = acpi_ds_create_node (walk_state,
 595                                                  op->common.parent->common.node,
 596                                                  op->common.parent);
 597                                 if (ACPI_FAILURE (status)) {
 598                                         break;
 599                                 }
 600
 601                                 /* Fall through */
 602                                 /*lint -fallthrough */
 603
 604                         case AML_INT_EVAL_SUBTREE_OP:
 605
 606                                 status = acpi_ds_eval_data_object_operands (walk_state, op,
 607                                                  acpi_ns_get_attached_object (op->common.parent->common.node));
 608                                 break;
 609
 610                         default:
 611
 612                                 status = acpi_ds_eval_data_object_operands (walk_state, op, NULL);
 613                                 break;
 614                         }
 615
 616                         /* Done with result state (Now that operand stack is built) */
 617
 618                         status = acpi_ds_result_stack_pop (walk_state);
 619                         if (ACPI_FAILURE (status)) {
 620                                 goto cleanup;
 621                         }
 622
 623                         /*
 624                          * If a result object was returned from above, push it on the
 625                          * current result stack
 626                          */
 627                         if (walk_state->result_obj) {
 628                                 status = acpi_ds_result_push (walk_state->result_obj, walk_state);
 629                         }
 630                         break;
 631
 632
 633                 case AML_TYPE_NAMED_FIELD:
 634                 case AML_TYPE_NAMED_COMPLEX:
 635                 case AML_TYPE_NAMED_SIMPLE:
 636                 case AML_TYPE_NAMED_NO_OBJ:
 637
 638                         status = acpi_ds_load2_end_op (walk_state);
 639                         if (ACPI_FAILURE (status)) {
 640                                 break;
 641                         }
 642
 643                         if (op->common.aml_opcode == AML_REGION_OP) {
 644                                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 645                                         "Executing op_region Address/Length Op=%p\n", op));
 646
 647                                 status = acpi_ds_eval_region_operands (walk_state, op);
 648                                 if (ACPI_FAILURE (status)) {
 649                                         break;
 650                                 }
 651
 652                                 status = acpi_ds_result_stack_pop (walk_state);
 653                         }
 654
 655                         break;
 656
 657
 658                 case AML_TYPE_UNDEFINED:
 659
 660                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 661                                 "Undefined opcode type Op=%p\n", op));
 662                         return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
 663
 664
 665                 case AML_TYPE_BOGUS:
 666
 667                         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 668                                 "Internal opcode=%X type Op=%p\n",
 669                                 walk_state->opcode, op));
 670                         break;
 671
 672
 673                 default:
 674
 675                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 676                                 "Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p\n",
 677                                 op_class, op_type, op->common.aml_opcode, op));
 678
 679                         status = AE_NOT_IMPLEMENTED;
 680                         break;
 681                 }
 682         }
 683
 684         /*
 685          * ACPI 2.0 support for 64-bit integers: Truncate numeric
 686          * result value if we are executing from a 32-bit ACPI table
 687          */
 688         acpi_ex_truncate_for32bit_table (walk_state->result_obj);
 689
 690         /*
 691          * Check if we just completed the evaluation of a
 692          * conditional predicate
 693          */
 694
 695         if ((ACPI_SUCCESS (status)) &&
 696                 (walk_state->control_state) &&
 697                 (walk_state->control_state->common.state ==
 698                         ACPI_CONTROL_PREDICATE_EXECUTING) &&
 699                 (walk_state->control_state->control.predicate_op == op)) {
 700                 status = acpi_ds_get_predicate_value (walk_state, walk_state->result_obj);
 701                 walk_state->result_obj = NULL;
 702         }
 703
 704
 705 cleanup:
 706
 707         /* Invoke exception handler on error */
 708
 709         if (ACPI_FAILURE (status) &&
 710                 acpi_gbl_exception_handler &&
 711                 !(status & AE_CODE_CONTROL)) {
 712                 acpi_ex_exit_interpreter ();
 713                 status = acpi_gbl_exception_handler (status,
 714                                  walk_state->method_node->name.integer, walk_state->opcode,
 715                                  walk_state->aml_offset, NULL);
 716                 (void) acpi_ex_enter_interpreter ();
 717         }
 718
 719         if (walk_state->result_obj) {
 720                 /* Break to debugger to display result */
 721
 722                 ACPI_DEBUGGER_EXEC (acpi_db_display_result_object (walk_state->result_obj,
 723                                  walk_state));
 724
 725                 /*
 726                  * Delete the result op if and only if:
 727                  * Parent will not use the result -- such as any
 728                  * non-nested type2 op in a method (parent will be method)
 729                  */
 730                 acpi_ds_delete_result_if_not_used (op, walk_state->result_obj, walk_state);
 731         }
 732
 733 #ifdef _UNDER_DEVELOPMENT
 734
 735         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
 736                 acpi_db_method_end (walk_state);
 737         }
 738 #endif
 739
 740         /* Always clear the object stack */
 741
 742         walk_state->num_operands = 0;
 743
 744 #ifdef ACPI_DISASSEMBLER
 745
 746         /* On error, display method locals/args */
 747
 748         if (ACPI_FAILURE (status)) {
 749                 acpi_dm_dump_method_info (status, walk_state, op);
 750         }
 751 #endif
 752
 753         return_ACPI_STATUS (status);
 754 }
 755
 756