drivers/acpi/acpica/dswexec.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: dswexec - Dispatcher method execution callbacks;
   5  *                        dispatch to interpreter.
   6  *
   7  * Copyright (C) 2000 - 2021, Intel Corp.
   8  *
   9  *****************************************************************************/
  10
  11 #include <acpi/acpi.h>
  12 #include "accommon.h"
  13 #include "acparser.h"
  14 #include "amlcode.h"
  15 #include "acdispat.h"
  16 #include "acinterp.h"
  17 #include "acnamesp.h"
  18 #include "acdebug.h"
  19 #ifdef ACPI_EXEC_APP
  20 #include "aecommon.h"
  21 #endif
  22
  23 #define _COMPONENT          ACPI_DISPATCHER
  24 ACPI_MODULE_NAME("dswexec")
  25
  26 /*
  27  * Dispatch table for opcode classes
  28  */
  29 static acpi_execute_op acpi_gbl_op_type_dispatch[] = {
  30         acpi_ex_opcode_0A_0T_1R,
  31         acpi_ex_opcode_1A_0T_0R,
  32         acpi_ex_opcode_1A_0T_1R,
  33         acpi_ex_opcode_1A_1T_0R,
  34         acpi_ex_opcode_1A_1T_1R,
  35         acpi_ex_opcode_2A_0T_0R,
  36         acpi_ex_opcode_2A_0T_1R,
  37         acpi_ex_opcode_2A_1T_1R,
  38         acpi_ex_opcode_2A_2T_1R,
  39         acpi_ex_opcode_3A_0T_0R,
  40         acpi_ex_opcode_3A_1T_1R,
  41         acpi_ex_opcode_6A_0T_1R
  42 };
  43
  44 /*****************************************************************************
  45  *
  46  * FUNCTION:    acpi_ds_get_predicate_value
  47  *
  48  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  49  *              result_obj      - if non-zero, pop result from result stack
  50  *
  51  * RETURN:      Status
  52  *
  53  * DESCRIPTION: Get the result of a predicate evaluation
  54  *
  55  ****************************************************************************/
  56
  57 acpi_status
  58 acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
  59                             union acpi_operand_object *result_obj)
  60 {
  61         acpi_status status = AE_OK;
  62         union acpi_operand_object *obj_desc;
  63         union acpi_operand_object *local_obj_desc = NULL;
  64
  65         ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
  66
  67         walk_state->control_state->common.state = 0;
  68
  69         if (result_obj) {
  70                 status = acpi_ds_result_pop(&obj_desc, walk_state);
  71                 if (ACPI_FAILURE(status)) {
  72                         ACPI_EXCEPTION((AE_INFO, status,
  73                                         "Could not get result from predicate evaluation"));
  74
  75                         return_ACPI_STATUS(status);
  76                 }
  77         } else {
  78                 status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
  79                 if (ACPI_FAILURE(status)) {
  80                         return_ACPI_STATUS(status);
  81                 }
  82
  83                 status =
  84                     acpi_ex_resolve_to_value(&walk_state->operands[0],
  85                                              walk_state);
  86                 if (ACPI_FAILURE(status)) {
  87                         return_ACPI_STATUS(status);
  88                 }
  89
  90                 obj_desc = walk_state->operands[0];
  91         }
  92
  93         if (!obj_desc) {
  94                 ACPI_ERROR((AE_INFO,
  95                             "No predicate ObjDesc=%p State=%p",
  96                             obj_desc, walk_state));
  97
  98                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
  99         }
 100
 101         /*
 102          * Result of predicate evaluation must be an Integer
 103          * object. Implicitly convert the argument if necessary.
 104          */
 105         status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc,
 106                                             ACPI_IMPLICIT_CONVERSION);
 107         if (ACPI_FAILURE(status)) {
 108                 goto cleanup;
 109         }
 110
 111         if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
 112                 ACPI_ERROR((AE_INFO,
 113                             "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
 114                             obj_desc, walk_state, obj_desc->common.type));
 115
 116                 status = AE_AML_OPERAND_TYPE;
 117                 goto cleanup;
 118         }
 119
 120         /* Truncate the predicate to 32-bits if necessary */
 121
 122         (void)acpi_ex_truncate_for32bit_table(local_obj_desc);
 123
 124         /*
 125          * Save the result of the predicate evaluation on
 126          * the control stack
 127          */
 128         if (local_obj_desc->integer.value) {
 129                 walk_state->control_state->common.value = TRUE;
 130         } else {
 131                 /*
 132                  * Predicate is FALSE, we will just toss the
 133                  * rest of the package
 134                  */
 135                 walk_state->control_state->common.value = FALSE;
 136                 status = AE_CTRL_FALSE;
 137         }
 138
 139         /* Predicate can be used for an implicit return value */
 140
 141         (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
 142
 143 cleanup:
 144
 145         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 146                           "Completed a predicate eval=%X Op=%p\n",
 147                           walk_state->control_state->common.value,
 148                           walk_state->op));
 149
 150         /* Break to debugger to display result */
 151
 152         acpi_db_display_result_object(local_obj_desc, walk_state);
 153
 154         /*
 155          * Delete the predicate result object (we know that
 156          * we don't need it anymore)
 157          */
 158         if (local_obj_desc != obj_desc) {
 159                 acpi_ut_remove_reference(local_obj_desc);
 160         }
 161         acpi_ut_remove_reference(obj_desc);
 162
 163         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
 164         return_ACPI_STATUS(status);
 165 }
 166
 167 /*****************************************************************************
 168  *
 169  * FUNCTION:    acpi_ds_exec_begin_op
 170  *
 171  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 172  *              out_op          - Where to return op if a new one is created
 173  *
 174  * RETURN:      Status
 175  *
 176  * DESCRIPTION: Descending callback used during the execution of control
 177  *              methods. This is where most operators and operands are
 178  *              dispatched to the interpreter.
 179  *
 180  ****************************************************************************/
 181
 182 acpi_status
 183 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
 184                       union acpi_parse_object **out_op)
 185 {
 186         union acpi_parse_object *op;
 187         acpi_status status = AE_OK;
 188         u32 opcode_class;
 189
 190         ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
 191
 192         op = walk_state->op;
 193         if (!op) {
 194                 status = acpi_ds_load2_begin_op(walk_state, out_op);
 195                 if (ACPI_FAILURE(status)) {
 196                         goto error_exit;
 197                 }
 198
 199                 op = *out_op;
 200                 walk_state->op = op;
 201                 walk_state->opcode = op->common.aml_opcode;
 202                 walk_state->op_info =
 203                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 204
 205                 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
 206                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 207                                           "(%s) Popping scope for Op %p\n",
 208                                           acpi_ut_get_type_name(walk_state->
 209                                                                 op_info->
 210                                                                 object_type),
 211                                           op));
 212
 213                         status = acpi_ds_scope_stack_pop(walk_state);
 214                         if (ACPI_FAILURE(status)) {
 215                                 goto error_exit;
 216                         }
 217                 }
 218         }
 219
 220         if (op == walk_state->origin) {
 221                 if (out_op) {
 222                         *out_op = op;
 223                 }
 224
 225                 return_ACPI_STATUS(AE_OK);
 226         }
 227
 228         /*
 229          * If the previous opcode was a conditional, this opcode
 230          * must be the beginning of the associated predicate.
 231          * Save this knowledge in the current scope descriptor
 232          */
 233         if ((walk_state->control_state) &&
 234             (walk_state->control_state->common.state ==
 235              ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 236                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 237                                   "Exec predicate Op=%p State=%p\n",
 238                                   op, walk_state));
 239
 240                 walk_state->control_state->common.state =
 241                     ACPI_CONTROL_PREDICATE_EXECUTING;
 242
 243                 /* Save start of predicate */
 244
 245                 walk_state->control_state->control.predicate_op = op;
 246         }
 247
 248         opcode_class = walk_state->op_info->class;
 249
 250         /* We want to send namepaths to the load code */
 251
 252         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 253                 opcode_class = AML_CLASS_NAMED_OBJECT;
 254         }
 255
 256         /*
 257          * Handle the opcode based upon the opcode type
 258          */
 259         switch (opcode_class) {
 260         case AML_CLASS_CONTROL:
 261
 262                 status = acpi_ds_exec_begin_control_op(walk_state, op);
 263                 break;
 264
 265         case AML_CLASS_NAMED_OBJECT:
 266
 267                 if (walk_state->walk_type & ACPI_WALK_METHOD) {
 268                         /*
 269                          * Found a named object declaration during method execution;
 270                          * we must enter this object into the namespace. The created
 271                          * object is temporary and will be deleted upon completion of
 272                          * the execution of this method.
 273                          *
 274                          * Note 10/2010: Except for the Scope() op. This opcode does
 275                          * not actually create a new object, it refers to an existing
 276                          * object. However, for Scope(), we want to indeed open a
 277                          * new scope.
 278                          */
 279                         if (op->common.aml_opcode != AML_SCOPE_OP) {
 280                                 status =
 281                                     acpi_ds_load2_begin_op(walk_state, NULL);
 282                         } else {
 283                                 status =
 284                                     acpi_ds_scope_stack_push(op->named.node,
 285                                                              op->named.node->
 286                                                              type, walk_state);
 287                                 if (ACPI_FAILURE(status)) {
 288                                         return_ACPI_STATUS(status);
 289                                 }
 290                         }
 291                 }
 292                 break;
 293
 294         case AML_CLASS_EXECUTE:
 295         case AML_CLASS_CREATE:
 296
 297                 break;
 298
 299         default:
 300
 301                 break;
 302         }
 303
 304         /* Nothing to do here during method execution */
 305
 306         return_ACPI_STATUS(status);
 307
 308 error_exit:
 309         status = acpi_ds_method_error(status, walk_state);
 310         return_ACPI_STATUS(status);
 311 }
 312
 313 /*****************************************************************************
 314  *
 315  * FUNCTION:    acpi_ds_exec_end_op
 316  *
 317  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 318  *
 319  * RETURN:      Status
 320  *
 321  * DESCRIPTION: Ascending callback used during the execution of control
 322  *              methods. The only thing we really need to do here is to
 323  *              notice the beginning of IF, ELSE, and WHILE blocks.
 324  *
 325  ****************************************************************************/
 326
 327 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 328 {
 329         union acpi_parse_object *op;
 330         acpi_status status = AE_OK;
 331         u32 op_type;
 332         u32 op_class;
 333         union acpi_parse_object *next_op;
 334         union acpi_parse_object *first_arg;
 335 #ifdef ACPI_EXEC_APP
 336         char *namepath;
 337         union acpi_operand_object *obj_desc;
 338 #endif
 339
 340         ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
 341
 342         op = walk_state->op;
 343         op_type = walk_state->op_info->type;
 344         op_class = walk_state->op_info->class;
 345
 346         if (op_class == AML_CLASS_UNKNOWN) {
 347                 ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
 348                             op->common.aml_opcode));
 349                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 350         }
 351
 352         first_arg = op->common.value.arg;
 353
 354         /* Init the walk state */
 355
 356         walk_state->num_operands = 0;
 357         walk_state->operand_index = 0;
 358         walk_state->return_desc = NULL;
 359         walk_state->result_obj = NULL;
 360
 361         /* Call debugger for single step support (DEBUG build only) */
 362
 363         status = acpi_db_single_step(walk_state, op, op_class);
 364         if (ACPI_FAILURE(status)) {
 365                 return_ACPI_STATUS(status);
 366         }
 367
 368         /* Decode the Opcode Class */
 369
 370         switch (op_class) {
 371         case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */
 372
 373                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
 374                         status = acpi_ds_evaluate_name_path(walk_state);
 375                         if (ACPI_FAILURE(status)) {
 376                                 goto cleanup;
 377                         }
 378                 }
 379                 break;
 380
 381         case AML_CLASS_EXECUTE: /* Most operators with arguments */
 382
 383                 /* Build resolved operand stack */
 384
 385                 status = acpi_ds_create_operands(walk_state, first_arg);
 386                 if (ACPI_FAILURE(status)) {
 387                         goto cleanup;
 388                 }
 389
 390                 /*
 391                  * All opcodes require operand resolution, with the only exceptions
 392                  * being the object_type and size_of operators.
 393                  */
 394                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
 395
 396                         /* Resolve all operands */
 397
 398                         status = acpi_ex_resolve_operands(walk_state->opcode,
 399                                                           &(walk_state->
 400                                                             operands
 401                                                             [walk_state->
 402                                                              num_operands - 1]),
 403                                                           walk_state);
 404                 }
 405
 406                 if (ACPI_SUCCESS(status)) {
 407                         /*
 408                          * Dispatch the request to the appropriate interpreter handler
 409                          * routine. There is one routine per opcode "type" based upon the
 410                          * number of opcode arguments and return type.
 411                          */
 412                         status =
 413                             acpi_gbl_op_type_dispatch[op_type] (walk_state);
 414                 } else {
 415                         /*
 416                          * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
 417                          * Local is uninitialized.
 418                          */
 419                         if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 420                             (walk_state->opcode == AML_STORE_OP) &&
 421                             (walk_state->operands[0]->common.type ==
 422                              ACPI_TYPE_LOCAL_REFERENCE)
 423                             && (walk_state->operands[1]->common.type ==
 424                                 ACPI_TYPE_LOCAL_REFERENCE)
 425                             && (walk_state->operands[0]->reference.class ==
 426                                 walk_state->operands[1]->reference.class)
 427                             && (walk_state->operands[0]->reference.value ==
 428                                 walk_state->operands[1]->reference.value)) {
 429                                 status = AE_OK;
 430                         } else {
 431                                 ACPI_EXCEPTION((AE_INFO, status,
 432                                                 "While resolving operands for [%s]",
 433                                                 acpi_ps_get_opcode_name
 434                                                 (walk_state->opcode)));
 435                         }
 436                 }
 437
 438                 /* Always delete the argument objects and clear the operand stack */
 439
 440                 acpi_ds_clear_operands(walk_state);
 441
 442                 /*
 443                  * If a result object was returned from above, push it on the
 444                  * current result stack
 445                  */
 446                 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
 447                         status =
 448                             acpi_ds_result_push(walk_state->result_obj,
 449                                                 walk_state);
 450                 }
 451                 break;
 452
 453         default:
 454
 455                 switch (op_type) {
 456                 case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 457
 458                         /* 1 Operand, 0 external_result, 0 internal_result */
 459
 460                         status = acpi_ds_exec_end_control_op(walk_state, op);
 461
 462                         break;
 463
 464                 case AML_TYPE_METHOD_CALL:
 465                         /*
 466                          * If the method is referenced from within a package
 467                          * declaration, it is not a invocation of the method, just
 468                          * a reference to it.
 469                          */
 470                         if ((op->asl.parent) &&
 471                             ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
 472                              || (op->asl.parent->asl.aml_opcode ==
 473                                  AML_VARIABLE_PACKAGE_OP))) {
 474                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 475                                                   "Method Reference in a Package, Op=%p\n",
 476                                                   op));
 477
 478                                 op->common.node = (struct acpi_namespace_node *)
 479                                     op->asl.value.arg->asl.node;
 480                                 acpi_ut_add_reference(op->asl.value.arg->asl.
 481                                                       node->object);
 482                                 return_ACPI_STATUS(AE_OK);
 483                         }
 484
 485                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 486                                           "Method invocation, Op=%p\n", op));
 487
 488                         /*
 489                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
 490                          * the method Node pointer
 491                          */
 492                         /* next_op points to the op that holds the method name */
 493
 494                         next_op = first_arg;
 495
 496                         /* next_op points to first argument op */
 497
 498                         next_op = next_op->common.next;
 499
 500                         /*
 501                          * Get the method's arguments and put them on the operand stack
 502                          */
 503                         status = acpi_ds_create_operands(walk_state, next_op);
 504                         if (ACPI_FAILURE(status)) {
 505                                 break;
 506                         }
 507
 508                         /*
 509                          * Since the operands will be passed to another control method,
 510                          * we must resolve all local references here (Local variables,
 511                          * arguments to *this* method, etc.)
 512                          */
 513                         status = acpi_ds_resolve_operands(walk_state);
 514                         if (ACPI_FAILURE(status)) {
 515
 516                                 /* On error, clear all resolved operands */
 517
 518                                 acpi_ds_clear_operands(walk_state);
 519                                 break;
 520                         }
 521
 522                         /*
 523                          * Tell the walk loop to preempt this running method and
 524                          * execute the new method
 525                          */
 526                         status = AE_CTRL_TRANSFER;
 527
 528                         /*
 529                          * Return now; we don't want to disturb anything,
 530                          * especially the operand count!
 531                          */
 532                         return_ACPI_STATUS(status);
 533
 534                 case AML_TYPE_CREATE_FIELD:
 535
 536                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 537                                           "Executing CreateField Buffer/Index Op=%p\n",
 538                                           op));
 539
 540                         status = acpi_ds_load2_end_op(walk_state);
 541                         if (ACPI_FAILURE(status)) {
 542                                 break;
 543                         }
 544
 545                         status =
 546                             acpi_ds_eval_buffer_field_operands(walk_state, op);
 547                         if (ACPI_FAILURE(status)) {
 548                                 break;
 549                         }
 550 #ifdef ACPI_EXEC_APP
 551                         /*
 552                          * acpi_exec support for namespace initialization file (initialize
 553                          * buffer_fields in this code.)
 554                          */
 555                         namepath =
 556                             acpi_ns_get_external_pathname(op->common.node);
 557                         status = ae_lookup_init_file_entry(namepath, &obj_desc);
 558                         if (ACPI_SUCCESS(status)) {
 559                                 status =
 560                                     acpi_ex_write_data_to_field(obj_desc,
 561                                                                 op->common.
 562                                                                 node->object,
 563                                                                 NULL);
 564                                 if ACPI_FAILURE
 565                                         (status) {
 566                                         ACPI_EXCEPTION((AE_INFO, status,
 567                                                         "While writing to buffer field"));
 568                                         }
 569                         }
 570                         ACPI_FREE(namepath);
 571                         status = AE_OK;
 572 #endif
 573                         break;
 574
 575                 case AML_TYPE_CREATE_OBJECT:
 576
 577                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 578                                           "Executing CreateObject (Buffer/Package) Op=%p Child=%p ParentOpcode=%4.4X\n",
 579                                           op, op->named.value.arg,
 580                                           op->common.parent->common.
 581                                           aml_opcode));
 582
 583                         switch (op->common.parent->common.aml_opcode) {
 584                         case AML_NAME_OP:
 585                                 /*
 586                                  * Put the Node on the object stack (Contains the ACPI Name
 587                                  * of this object)
 588                                  */
 589                                 walk_state->operands[0] = (void *)
 590                                     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                                 ACPI_FALLTHROUGH;
 602
 603                         case AML_INT_EVAL_SUBTREE_OP:
 604
 605                                 status =
 606                                     acpi_ds_eval_data_object_operands
 607                                     (walk_state, op,
 608                                      acpi_ns_get_attached_object(op->common.
 609                                                                  parent->common.
 610                                                                  node));
 611                                 break;
 612
 613                         default:
 614
 615                                 status =
 616                                     acpi_ds_eval_data_object_operands
 617                                     (walk_state, op, NULL);
 618                                 break;
 619                         }
 620
 621                         /*
 622                          * If a result object was returned from above, push it on the
 623                          * current result stack
 624                          */
 625                         if (walk_state->result_obj) {
 626                                 status =
 627                                     acpi_ds_result_push(walk_state->result_obj,
 628                                                         walk_state);
 629                         }
 630                         break;
 631
 632                 case AML_TYPE_NAMED_FIELD:
 633                 case AML_TYPE_NAMED_COMPLEX:
 634                 case AML_TYPE_NAMED_SIMPLE:
 635                 case AML_TYPE_NAMED_NO_OBJ:
 636
 637                         status = acpi_ds_load2_end_op(walk_state);
 638                         if (ACPI_FAILURE(status)) {
 639                                 break;
 640                         }
 641
 642                         if (op->common.aml_opcode == AML_REGION_OP) {
 643                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 644                                                   "Executing OpRegion Address/Length Op=%p\n",
 645                                                   op));
 646
 647                                 status =
 648                                     acpi_ds_eval_region_operands(walk_state,
 649                                                                  op);
 650                                 if (ACPI_FAILURE(status)) {
 651                                         break;
 652                                 }
 653                         } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 654                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 655                                                   "Executing DataTableRegion Strings Op=%p\n",
 656                                                   op));
 657
 658                                 status =
 659                                     acpi_ds_eval_table_region_operands
 660                                     (walk_state, op);
 661                                 if (ACPI_FAILURE(status)) {
 662                                         break;
 663                                 }
 664                         } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
 665                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 666                                                   "Executing BankField Op=%p\n",
 667                                                   op));
 668
 669                                 status =
 670                                     acpi_ds_eval_bank_field_operands(walk_state,
 671                                                                      op);
 672                                 if (ACPI_FAILURE(status)) {
 673                                         break;
 674                                 }
 675                         }
 676                         break;
 677
 678                 case AML_TYPE_UNDEFINED:
 679
 680                         ACPI_ERROR((AE_INFO,
 681                                     "Undefined opcode type Op=%p", op));
 682                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 683
 684                 case AML_TYPE_BOGUS:
 685
 686                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 687                                           "Internal opcode=%X type Op=%p\n",
 688                                           walk_state->opcode, op));
 689                         break;
 690
 691                 default:
 692
 693                         ACPI_ERROR((AE_INFO,
 694                                     "Unimplemented opcode, class=0x%X "
 695                                     "type=0x%X Opcode=0x%X Op=%p",
 696                                     op_class, op_type, op->common.aml_opcode,
 697                                     op));
 698
 699                         status = AE_NOT_IMPLEMENTED;
 700                         break;
 701                 }
 702         }
 703
 704         /*
 705          * ACPI 2.0 support for 64-bit integers: Truncate numeric
 706          * result value if we are executing from a 32-bit ACPI table
 707          */
 708         (void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);
 709
 710         /*
 711          * Check if we just completed the evaluation of a
 712          * conditional predicate
 713          */
 714         if ((ACPI_SUCCESS(status)) &&
 715             (walk_state->control_state) &&
 716             (walk_state->control_state->common.state ==
 717              ACPI_CONTROL_PREDICATE_EXECUTING) &&
 718             (walk_state->control_state->control.predicate_op == op)) {
 719                 status =
 720                     acpi_ds_get_predicate_value(walk_state,
 721                                                 walk_state->result_obj);
 722                 walk_state->result_obj = NULL;
 723         }
 724
 725 cleanup:
 726
 727         if (walk_state->result_obj) {
 728
 729                 /* Break to debugger to display result */
 730
 731                 acpi_db_display_result_object(walk_state->result_obj,
 732                                               walk_state);
 733
 734                 /*
 735                  * Delete the result op if and only if:
 736                  * Parent will not use the result -- such as any
 737                  * non-nested type2 op in a method (parent will be method)
 738                  */
 739                 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
 740                                                   walk_state);
 741         }
 742 #ifdef _UNDER_DEVELOPMENT
 743
 744         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
 745                 acpi_db_method_end(walk_state);
 746         }
 747 #endif
 748
 749         /* Invoke exception handler on error */
 750
 751         if (ACPI_FAILURE(status)) {
 752                 status = acpi_ds_method_error(status, walk_state);
 753         }
 754
 755         /* Always clear the object stack */
 756
 757         walk_state->num_operands = 0;
 758         return_ACPI_STATUS(status);
 759 }