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 - 2006, 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 #include <acpi/acdisasm.h>
  53
  54 #define _COMPONENT          ACPI_DISPATCHER
  55 ACPI_MODULE_NAME("dswexec")
  56
  57 /*
  58  * Dispatch table for opcode classes
  59  */
  60 static ACPI_EXECUTE_OP acpi_gbl_op_type_dispatch[] = {
  61         acpi_ex_opcode_0A_0T_1R,
  62         acpi_ex_opcode_1A_0T_0R,
  63         acpi_ex_opcode_1A_0T_1R,
  64         acpi_ex_opcode_1A_1T_0R,
  65         acpi_ex_opcode_1A_1T_1R,
  66         acpi_ex_opcode_2A_0T_0R,
  67         acpi_ex_opcode_2A_0T_1R,
  68         acpi_ex_opcode_2A_1T_1R,
  69         acpi_ex_opcode_2A_2T_1R,
  70         acpi_ex_opcode_3A_0T_0R,
  71         acpi_ex_opcode_3A_1T_1R,
  72         acpi_ex_opcode_6A_0T_1R
  73 };
  74
  75 /*****************************************************************************
  76  *
  77  * FUNCTION:    acpi_ds_get_predicate_value
  78  *
  79  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  80  *              result_obj      - if non-zero, pop result from result stack
  81  *
  82  * RETURN:      Status
  83  *
  84  * DESCRIPTION: Get the result of a predicate evaluation
  85  *
  86  ****************************************************************************/
  87
  88 acpi_status
  89 acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
  90                             union acpi_operand_object *result_obj)
  91 {
  92         acpi_status status = AE_OK;
  93         union acpi_operand_object *obj_desc;
  94         union acpi_operand_object *local_obj_desc = NULL;
  95
  96         ACPI_FUNCTION_TRACE_PTR("ds_get_predicate_value", walk_state);
  97
  98         walk_state->control_state->common.state = 0;
  99
 100         if (result_obj) {
 101                 status = acpi_ds_result_pop(&obj_desc, walk_state);
 102                 if (ACPI_FAILURE(status)) {
 103                         ACPI_REPORT_ERROR(("Could not get result from predicate evaluation, %s\n", acpi_format_exception(status)));
 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_REPORT_ERROR(("No predicate obj_desc=%p State=%p\n",
 125                                    obj_desc, walk_state));
 126
 127                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 128         }
 129
 130         /*
 131          * Result of predicate evaluation must be an Integer
 132          * object. Implicitly convert the argument if necessary.
 133          */
 134         status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc, 16);
 135         if (ACPI_FAILURE(status)) {
 136                 goto cleanup;
 137         }
 138
 139         if (ACPI_GET_OBJECT_TYPE(local_obj_desc) != ACPI_TYPE_INTEGER) {
 140                 ACPI_REPORT_ERROR(("Bad predicate (not an integer) obj_desc=%p State=%p Type=%X\n", obj_desc, walk_state, ACPI_GET_OBJECT_TYPE(obj_desc)));
 141
 142                 status = AE_AML_OPERAND_TYPE;
 143                 goto cleanup;
 144         }
 145
 146         /* Truncate the predicate to 32-bits if necessary */
 147
 148         acpi_ex_truncate_for32bit_table(local_obj_desc);
 149
 150         /*
 151          * Save the result of the predicate evaluation on
 152          * the control stack
 153          */
 154         if (local_obj_desc->integer.value) {
 155                 walk_state->control_state->common.value = TRUE;
 156         } else {
 157                 /*
 158                  * Predicate is FALSE, we will just toss the
 159                  * rest of the package
 160                  */
 161                 walk_state->control_state->common.value = FALSE;
 162                 status = AE_CTRL_FALSE;
 163         }
 164
 165       cleanup:
 166
 167         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
 168                           walk_state->control_state->common.value,
 169                           walk_state->op));
 170
 171         /* Break to debugger to display result */
 172
 173         ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
 174                            (local_obj_desc, walk_state));
 175
 176         /*
 177          * Delete the predicate result object (we know that
 178          * we don't need it anymore)
 179          */
 180         if (local_obj_desc != obj_desc) {
 181                 acpi_ut_remove_reference(local_obj_desc);
 182         }
 183         acpi_ut_remove_reference(obj_desc);
 184
 185         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
 186         return_ACPI_STATUS(status);
 187 }
 188
 189 /*****************************************************************************
 190  *
 191  * FUNCTION:    acpi_ds_exec_begin_op
 192  *
 193  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 194  *              out_op          - Where to return op if a new one is created
 195  *
 196  * RETURN:      Status
 197  *
 198  * DESCRIPTION: Descending callback used during the execution of control
 199  *              methods.  This is where most operators and operands are
 200  *              dispatched to the interpreter.
 201  *
 202  ****************************************************************************/
 203
 204 acpi_status
 205 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
 206                       union acpi_parse_object **out_op)
 207 {
 208         union acpi_parse_object *op;
 209         acpi_status status = AE_OK;
 210         u32 opcode_class;
 211
 212         ACPI_FUNCTION_TRACE_PTR("ds_exec_begin_op", walk_state);
 213
 214         op = walk_state->op;
 215         if (!op) {
 216                 status = acpi_ds_load2_begin_op(walk_state, out_op);
 217                 if (ACPI_FAILURE(status)) {
 218                         return_ACPI_STATUS(status);
 219                 }
 220
 221                 op = *out_op;
 222                 walk_state->op = op;
 223                 walk_state->opcode = op->common.aml_opcode;
 224                 walk_state->op_info =
 225                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 226
 227                 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
 228                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 229                                           "(%s) Popping scope for Op %p\n",
 230                                           acpi_ut_get_type_name(walk_state->
 231                                                                 op_info->
 232                                                                 object_type),
 233                                           op));
 234
 235                         status = acpi_ds_scope_stack_pop(walk_state);
 236                         if (ACPI_FAILURE(status)) {
 237                                 return_ACPI_STATUS(status);
 238                         }
 239                 }
 240         }
 241
 242         if (op == walk_state->origin) {
 243                 if (out_op) {
 244                         *out_op = op;
 245                 }
 246
 247                 return_ACPI_STATUS(AE_OK);
 248         }
 249
 250         /*
 251          * If the previous opcode was a conditional, this opcode
 252          * must be the beginning of the associated predicate.
 253          * Save this knowledge in the current scope descriptor
 254          */
 255         if ((walk_state->control_state) &&
 256             (walk_state->control_state->common.state ==
 257              ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 258                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 259                                   "Exec predicate Op=%p State=%p\n", op,
 260                                   walk_state));
 261
 262                 walk_state->control_state->common.state =
 263                     ACPI_CONTROL_PREDICATE_EXECUTING;
 264
 265                 /* Save start of predicate */
 266
 267                 walk_state->control_state->control.predicate_op = op;
 268         }
 269
 270         opcode_class = walk_state->op_info->class;
 271
 272         /* We want to send namepaths to the load code */
 273
 274         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 275                 opcode_class = AML_CLASS_NAMED_OBJECT;
 276         }
 277
 278         /*
 279          * Handle the opcode based upon the opcode type
 280          */
 281         switch (opcode_class) {
 282         case AML_CLASS_CONTROL:
 283
 284                 status = acpi_ds_result_stack_push(walk_state);
 285                 if (ACPI_FAILURE(status)) {
 286                         return_ACPI_STATUS(status);
 287                 }
 288
 289                 status = acpi_ds_exec_begin_control_op(walk_state, op);
 290                 break;
 291
 292         case AML_CLASS_NAMED_OBJECT:
 293
 294                 if (walk_state->walk_type == ACPI_WALK_METHOD) {
 295                         /*
 296                          * Found a named object declaration during method execution;
 297                          * we must enter this object into the namespace.  The created
 298                          * object is temporary and will be deleted upon completion of
 299                          * the execution of this method.
 300                          */
 301                         status = acpi_ds_load2_begin_op(walk_state, NULL);
 302                 }
 303
 304                 if (op->common.aml_opcode == AML_REGION_OP) {
 305                         status = acpi_ds_result_stack_push(walk_state);
 306                 }
 307                 break;
 308
 309         case AML_CLASS_EXECUTE:
 310         case AML_CLASS_CREATE:
 311                 /*
 312                  * Most operators with arguments.
 313                  * Start a new result/operand state
 314                  */
 315                 if (walk_state->opcode != AML_CREATE_FIELD_OP) {
 316                         status = acpi_ds_result_stack_push(walk_state);
 317                 }
 318                 break;
 319
 320         default:
 321                 break;
 322         }
 323
 324         /* Nothing to do here during method execution */
 325
 326         return_ACPI_STATUS(status);
 327 }
 328
 329 /*****************************************************************************
 330  *
 331  * FUNCTION:    acpi_ds_exec_end_op
 332  *
 333  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 334  *
 335  * RETURN:      Status
 336  *
 337  * DESCRIPTION: Ascending callback used during the execution of control
 338  *              methods.  The only thing we really need to do here is to
 339  *              notice the beginning of IF, ELSE, and WHILE blocks.
 340  *
 341  ****************************************************************************/
 342
 343 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 344 {
 345         union acpi_parse_object *op;
 346         acpi_status status = AE_OK;
 347         u32 op_type;
 348         u32 op_class;
 349         union acpi_parse_object *next_op;
 350         union acpi_parse_object *first_arg;
 351
 352         ACPI_FUNCTION_TRACE_PTR("ds_exec_end_op", walk_state);
 353
 354         op = walk_state->op;
 355         op_type = walk_state->op_info->type;
 356         op_class = walk_state->op_info->class;
 357
 358         if (op_class == AML_CLASS_UNKNOWN) {
 359                 ACPI_REPORT_ERROR(("Unknown opcode %X\n",
 360                                    op->common.aml_opcode));
 361                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 362         }
 363
 364         first_arg = op->common.value.arg;
 365
 366         /* Init the walk state */
 367
 368         walk_state->num_operands = 0;
 369         walk_state->return_desc = NULL;
 370         walk_state->result_obj = NULL;
 371
 372         /* Call debugger for single step support (DEBUG build only) */
 373
 374         ACPI_DEBUGGER_EXEC(status =
 375                            acpi_db_single_step(walk_state, op, op_class));
 376         ACPI_DEBUGGER_EXEC(if (ACPI_FAILURE(status)) {
 377                            return_ACPI_STATUS(status);}
 378         ) ;
 379
 380         /* Decode the Opcode Class */
 381
 382         switch (op_class) {
 383         case AML_CLASS_ARGUMENT:        /* constants, literals, etc. - do nothing */
 384                 break;
 385
 386         case AML_CLASS_EXECUTE: /* most operators with arguments */
 387
 388                 /* Build resolved operand stack */
 389
 390                 status = acpi_ds_create_operands(walk_state, first_arg);
 391                 if (ACPI_FAILURE(status)) {
 392                         goto cleanup;
 393                 }
 394
 395                 /* Done with this result state (Now that operand stack is built) */
 396
 397                 status = acpi_ds_result_stack_pop(walk_state);
 398                 if (ACPI_FAILURE(status)) {
 399                         goto cleanup;
 400                 }
 401
 402                 /*
 403                  * All opcodes require operand resolution, with the only exceptions
 404                  * being the object_type and size_of operators.
 405                  */
 406                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
 407                         /* Resolve all operands */
 408
 409                         status = acpi_ex_resolve_operands(walk_state->opcode,
 410                                                           &(walk_state->
 411                                                             operands
 412                                                             [walk_state->
 413                                                              num_operands - 1]),
 414                                                           walk_state);
 415                         if (ACPI_SUCCESS(status)) {
 416                                 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 417                                                    ACPI_IMODE_EXECUTE,
 418                                                    acpi_ps_get_opcode_name
 419                                                    (walk_state->opcode),
 420                                                    walk_state->num_operands,
 421                                                    "after ex_resolve_operands");
 422                         }
 423                 }
 424
 425                 if (ACPI_SUCCESS(status)) {
 426                         /*
 427                          * Dispatch the request to the appropriate interpreter handler
 428                          * routine.  There is one routine per opcode "type" based upon the
 429                          * number of opcode arguments and return type.
 430                          */
 431                         status =
 432                             acpi_gbl_op_type_dispatch[op_type] (walk_state);
 433                 } else {
 434                         /*
 435                          * Treat constructs of the form "Store(local_x,local_x)" as noops when the
 436                          * Local is uninitialized.
 437                          */
 438                         if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 439                             (walk_state->opcode == AML_STORE_OP) &&
 440                             (walk_state->operands[0]->common.type ==
 441                              ACPI_TYPE_LOCAL_REFERENCE)
 442                             && (walk_state->operands[1]->common.type ==
 443                                 ACPI_TYPE_LOCAL_REFERENCE)
 444                             && (walk_state->operands[0]->reference.opcode ==
 445                                 walk_state->operands[1]->reference.opcode)
 446                             && (walk_state->operands[0]->reference.offset ==
 447                                 walk_state->operands[1]->reference.offset)) {
 448                                 status = AE_OK;
 449                         } else {
 450                                 ACPI_REPORT_ERROR(("[%s]: Could not resolve operands, %s\n", acpi_ps_get_opcode_name(walk_state->opcode), acpi_format_exception(status)));
 451                         }
 452                 }
 453
 454                 /* Always delete the argument objects and clear the operand stack */
 455
 456                 acpi_ds_clear_operands(walk_state);
 457
 458                 /*
 459                  * If a result object was returned from above, push it on the
 460                  * current result stack
 461                  */
 462                 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
 463                         status =
 464                             acpi_ds_result_push(walk_state->result_obj,
 465                                                 walk_state);
 466                 }
 467
 468                 break;
 469
 470         default:
 471
 472                 switch (op_type) {
 473                 case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 474
 475                         /* 1 Operand, 0 external_result, 0 internal_result */
 476
 477                         status = acpi_ds_exec_end_control_op(walk_state, op);
 478
 479                         /* Make sure to properly pop the result stack */
 480
 481                         if (ACPI_SUCCESS(status)) {
 482                                 status = acpi_ds_result_stack_pop(walk_state);
 483                         } else if (status == AE_CTRL_PENDING) {
 484                                 status = acpi_ds_result_stack_pop(walk_state);
 485                                 if (ACPI_SUCCESS(status)) {
 486                                         status = AE_CTRL_PENDING;
 487                                 }
 488                         }
 489                         break;
 490
 491                 case AML_TYPE_METHOD_CALL:
 492
 493                         /*
 494                          * If the method is referenced from within a package
 495                          * declaration, it is not a invocation of the method, just
 496                          * a reference to it.
 497                          */
 498                         if ((op->asl.parent) &&
 499                             ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
 500                              || (op->asl.parent->asl.aml_opcode ==
 501                                  AML_VAR_PACKAGE_OP))) {
 502                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 503                                                   "Method Reference in a Package, Op=%p\n",
 504                                                   op));
 505                                 op->common.node =
 506                                     (struct acpi_namespace_node *)op->asl.value.
 507                                     arg->asl.node->object;
 508                                 acpi_ut_add_reference(op->asl.value.arg->asl.
 509                                                       node->object);
 510                                 return_ACPI_STATUS(AE_OK);
 511                         }
 512
 513                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 514                                           "Method invocation, Op=%p\n", op));
 515
 516                         /*
 517                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
 518                          * the method Node pointer
 519                          */
 520                         /* next_op points to the op that holds the method name */
 521
 522                         next_op = first_arg;
 523
 524                         /* next_op points to first argument op */
 525
 526                         next_op = next_op->common.next;
 527
 528                         /*
 529                          * Get the method's arguments and put them on the operand stack
 530                          */
 531                         status = acpi_ds_create_operands(walk_state, next_op);
 532                         if (ACPI_FAILURE(status)) {
 533                                 break;
 534                         }
 535
 536                         /*
 537                          * Since the operands will be passed to another control method,
 538                          * we must resolve all local references here (Local variables,
 539                          * arguments to *this* method, etc.)
 540                          */
 541                         status = acpi_ds_resolve_operands(walk_state);
 542                         if (ACPI_FAILURE(status)) {
 543                                 /* On error, clear all resolved operands */
 544
 545                                 acpi_ds_clear_operands(walk_state);
 546                                 break;
 547                         }
 548
 549                         /*
 550                          * Tell the walk loop to preempt this running method and
 551                          * execute the new method
 552                          */
 553                         status = AE_CTRL_TRANSFER;
 554
 555                         /*
 556                          * Return now; we don't want to disturb anything,
 557                          * especially the operand count!
 558                          */
 559                         return_ACPI_STATUS(status);
 560
 561                 case AML_TYPE_CREATE_FIELD:
 562
 563                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 564                                           "Executing create_field Buffer/Index Op=%p\n",
 565                                           op));
 566
 567                         status = acpi_ds_load2_end_op(walk_state);
 568                         if (ACPI_FAILURE(status)) {
 569                                 break;
 570                         }
 571
 572                         status =
 573                             acpi_ds_eval_buffer_field_operands(walk_state, op);
 574                         break;
 575
 576                 case AML_TYPE_CREATE_OBJECT:
 577
 578                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 579                                           "Executing create_object (Buffer/Package) Op=%p\n",
 580                                           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
 587                                  * of this object)
 588                                  */
 589                                 walk_state->operands[0] =
 590                                     (void *)op->common.parent->common.node;
 591                                 walk_state->num_operands = 1;
 592
 593                                 status = acpi_ds_create_node(walk_state,
 594                                                              op->common.parent->
 595                                                              common.node,
 596                                                              op->common.parent);
 597                                 if (ACPI_FAILURE(status)) {
 598                                         break;
 599                                 }
 600
 601                                 /* Fall through */
 602                                 /*lint -fallthrough */
 603
 604                         case AML_INT_EVAL_SUBTREE_OP:
 605
 606                                 status =
 607                                     acpi_ds_eval_data_object_operands
 608                                     (walk_state, op,
 609                                      acpi_ns_get_attached_object(op->common.
 610                                                                  parent->common.
 611                                                                  node));
 612                                 break;
 613
 614                         default:
 615
 616                                 status =
 617                                     acpi_ds_eval_data_object_operands
 618                                     (walk_state, op, NULL);
 619                                 break;
 620                         }
 621
 622                         /* Done with result state (Now that operand stack is built) */
 623
 624                         status = acpi_ds_result_stack_pop(walk_state);
 625                         if (ACPI_FAILURE(status)) {
 626                                 goto cleanup;
 627                         }
 628
 629                         /*
 630                          * If a result object was returned from above, push it on the
 631                          * current result stack
 632                          */
 633                         if (walk_state->result_obj) {
 634                                 status =
 635                                     acpi_ds_result_push(walk_state->result_obj,
 636                                                         walk_state);
 637                         }
 638                         break;
 639
 640                 case AML_TYPE_NAMED_FIELD:
 641                 case AML_TYPE_NAMED_COMPLEX:
 642                 case AML_TYPE_NAMED_SIMPLE:
 643                 case AML_TYPE_NAMED_NO_OBJ:
 644
 645                         status = acpi_ds_load2_end_op(walk_state);
 646                         if (ACPI_FAILURE(status)) {
 647                                 break;
 648                         }
 649
 650                         if (op->common.aml_opcode == AML_REGION_OP) {
 651                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 652                                                   "Executing op_region Address/Length Op=%p\n",
 653                                                   op));
 654
 655                                 status =
 656                                     acpi_ds_eval_region_operands(walk_state,
 657                                                                  op);
 658                                 if (ACPI_FAILURE(status)) {
 659                                         break;
 660                                 }
 661
 662                                 status = acpi_ds_result_stack_pop(walk_state);
 663                         }
 664
 665                         break;
 666
 667                 case AML_TYPE_UNDEFINED:
 668
 669                         ACPI_REPORT_ERROR(("Undefined opcode type Op=%p\n",
 670                                            op));
 671                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 672
 673                 case AML_TYPE_BOGUS:
 674
 675                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 676                                           "Internal opcode=%X type Op=%p\n",
 677                                           walk_state->opcode, op));
 678                         break;
 679
 680                 default:
 681
 682                         ACPI_REPORT_ERROR(("Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p\n", op_class, op_type, op->common.aml_opcode, op));
 683
 684                         status = AE_NOT_IMPLEMENTED;
 685                         break;
 686                 }
 687         }
 688
 689         /*
 690          * ACPI 2.0 support for 64-bit integers: Truncate numeric
 691          * result value if we are executing from a 32-bit ACPI table
 692          */
 693         acpi_ex_truncate_for32bit_table(walk_state->result_obj);
 694
 695         /*
 696          * Check if we just completed the evaluation of a
 697          * conditional predicate
 698          */
 699
 700         if ((ACPI_SUCCESS(status)) &&
 701             (walk_state->control_state) &&
 702             (walk_state->control_state->common.state ==
 703              ACPI_CONTROL_PREDICATE_EXECUTING) &&
 704             (walk_state->control_state->control.predicate_op == op)) {
 705                 status =
 706                     acpi_ds_get_predicate_value(walk_state,
 707                                                 walk_state->result_obj);
 708                 walk_state->result_obj = NULL;
 709         }
 710
 711       cleanup:
 712
 713         if (walk_state->result_obj) {
 714                 /* Break to debugger to display result */
 715
 716                 ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
 717                                    (walk_state->result_obj, walk_state));
 718
 719                 /*
 720                  * Delete the result op if and only if:
 721                  * Parent will not use the result -- such as any
 722                  * non-nested type2 op in a method (parent will be method)
 723                  */
 724                 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
 725                                                   walk_state);
 726         }
 727 #ifdef _UNDER_DEVELOPMENT
 728
 729         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
 730                 acpi_db_method_end(walk_state);
 731         }
 732 #endif
 733
 734         /* Invoke exception handler on error */
 735
 736         if (ACPI_FAILURE(status)) {
 737                 status = acpi_ds_method_error(status, walk_state);
 738         }
 739
 740         /* Always clear the object stack */
 741
 742         walk_state->num_operands = 0;
 743         return_ACPI_STATUS(status);
 744 }