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 - 2004, 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_1A_0T_0R,
  64                          acpi_ex_opcode_1A_0T_1R,
  65                          acpi_ex_opcode_1A_1T_0R,
  66                          acpi_ex_opcode_1A_1T_1R,
  67                          acpi_ex_opcode_2A_0T_0R,
  68                          acpi_ex_opcode_2A_0T_1R,
  69                          acpi_ex_opcode_2A_1T_1R,
  70                          acpi_ex_opcode_2A_2T_1R,
  71                          acpi_ex_opcode_3A_0T_0R,
  72                          acpi_ex_opcode_3A_1T_1R,
  73                          acpi_ex_opcode_6A_0T_1R};
  74
  75 /*****************************************************************************
  76  *
  77  * FUNCTION:    acpi_ds_get_predicate_value
  78  *
  79  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  80  *
  81  * RETURN:      Status
  82  *
  83  * DESCRIPTION: Get the result of a predicate evaluation
  84  *
  85  ****************************************************************************/
  86
  87 acpi_status
  88 acpi_ds_get_predicate_value (
  89         struct acpi_walk_state          *walk_state,
  90         union acpi_operand_object       *result_obj) {
  91         acpi_status                     status = AE_OK;
  92         union acpi_operand_object       *obj_desc;
  93
  94
  95         ACPI_FUNCTION_TRACE_PTR ("ds_get_predicate_value", walk_state);
  96
  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_DEBUG_PRINT ((ACPI_DB_ERROR,
 104                                 "Could not get result from predicate evaluation, %s\n",
 105                                 acpi_format_exception (status)));
 106
 107                         return_ACPI_STATUS (status);
 108                 }
 109         }
 110         else {
 111                 status = acpi_ds_create_operand (walk_state, walk_state->op, 0);
 112                 if (ACPI_FAILURE (status)) {
 113                         return_ACPI_STATUS (status);
 114                 }
 115
 116                 status = acpi_ex_resolve_to_value (&walk_state->operands [0], walk_state);
 117                 if (ACPI_FAILURE (status)) {
 118                         return_ACPI_STATUS (status);
 119                 }
 120
 121                 obj_desc = walk_state->operands [0];
 122         }
 123
 124         if (!obj_desc) {
 125                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No predicate obj_desc=%p State=%p\n",
 126                         obj_desc, walk_state));
 127
 128                 return_ACPI_STATUS (AE_AML_NO_OPERAND);
 129         }
 130
 131         /*
 132          * Result of predicate evaluation currently must
 133          * be a number
 134          */
 135         if (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_INTEGER) {
 136                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 137                         "Bad predicate (not a number) obj_desc=%p State=%p Type=%X\n",
 138                         obj_desc, walk_state, ACPI_GET_OBJECT_TYPE (obj_desc)));
 139
 140                 status = AE_AML_OPERAND_TYPE;
 141                 goto cleanup;
 142         }
 143
 144         /* Truncate the predicate to 32-bits if necessary */
 145
 146         acpi_ex_truncate_for32bit_table (obj_desc);
 147
 148         /*
 149          * Save the result of the predicate evaluation on
 150          * the control stack
 151          */
 152         if (obj_desc->integer.value) {
 153                 walk_state->control_state->common.value = TRUE;
 154         }
 155         else {
 156                 /*
 157                  * Predicate is FALSE, we will just toss the
 158                  * rest of the package
 159                  */
 160                 walk_state->control_state->common.value = FALSE;
 161                 status = AE_CTRL_FALSE;
 162         }
 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, walk_state->op));
 169
 170          /* Break to debugger to display result */
 171
 172         ACPI_DEBUGGER_EXEC (acpi_db_display_result_object (obj_desc, walk_state));
 173
 174         /*
 175          * Delete the predicate result object (we know that
 176          * we don't need it anymore)
 177          */
 178         acpi_ut_remove_reference (obj_desc);
 179
 180         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
 181         return_ACPI_STATUS (status);
 182 }
 183
 184
 185 /*****************************************************************************
 186  *
 187  * FUNCTION:    acpi_ds_exec_begin_op
 188  *
 189  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 190  *              out_op          - Return op if a new one is created
 191  *
 192  * RETURN:      Status
 193  *
 194  * DESCRIPTION: Descending callback used during the execution of control
 195  *              methods.  This is where most operators and operands are
 196  *              dispatched to the interpreter.
 197  *
 198  ****************************************************************************/
 199
 200 acpi_status
 201 acpi_ds_exec_begin_op (
 202         struct acpi_walk_state          *walk_state,
 203         union acpi_parse_object         **out_op)
 204 {
 205         union acpi_parse_object         *op;
 206         acpi_status                     status = AE_OK;
 207         u32                             opcode_class;
 208
 209
 210         ACPI_FUNCTION_TRACE_PTR ("ds_exec_begin_op", walk_state);
 211
 212
 213         op = walk_state->op;
 214         if (!op) {
 215                 status = acpi_ds_load2_begin_op (walk_state, out_op);
 216                 if (ACPI_FAILURE (status)) {
 217                         return_ACPI_STATUS (status);
 218                 }
 219
 220                 op = *out_op;
 221                 walk_state->op = op;
 222                 walk_state->opcode = op->common.aml_opcode;
 223                 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
 224
 225                 if (acpi_ns_opens_scope (walk_state->op_info->object_type)) {
 226                         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "(%s) Popping scope for Op %p\n",
 227                                 acpi_ut_get_type_name (walk_state->op_info->object_type), op));
 228
 229                         status = acpi_ds_scope_stack_pop (walk_state);
 230                         if (ACPI_FAILURE (status)) {
 231                                 return_ACPI_STATUS (status);
 232                         }
 233                 }
 234         }
 235
 236         if (op == walk_state->origin) {
 237                 if (out_op) {
 238                         *out_op = op;
 239                 }
 240
 241                 return_ACPI_STATUS (AE_OK);
 242         }
 243
 244         /*
 245          * If the previous opcode was a conditional, this opcode
 246          * must be the beginning of the associated predicate.
 247          * Save this knowledge in the current scope descriptor
 248          */
 249         if ((walk_state->control_state) &&
 250                 (walk_state->control_state->common.state ==
 251                         ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
 252                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Exec predicate Op=%p State=%p\n",
 253                                   op, walk_state));
 254
 255                 walk_state->control_state->common.state = ACPI_CONTROL_PREDICATE_EXECUTING;
 256
 257                 /* Save start of predicate */
 258
 259                 walk_state->control_state->control.predicate_op = op;
 260         }
 261
 262
 263         opcode_class = walk_state->op_info->class;
 264
 265         /* We want to send namepaths to the load code */
 266
 267         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
 268                 opcode_class = AML_CLASS_NAMED_OBJECT;
 269         }
 270
 271         /*
 272          * Handle the opcode based upon the opcode type
 273          */
 274         switch (opcode_class) {
 275         case AML_CLASS_CONTROL:
 276
 277                 status = acpi_ds_result_stack_push (walk_state);
 278                 if (ACPI_FAILURE (status)) {
 279                         return_ACPI_STATUS (status);
 280                 }
 281
 282                 status = acpi_ds_exec_begin_control_op (walk_state, op);
 283                 break;
 284
 285
 286         case AML_CLASS_NAMED_OBJECT:
 287
 288                 if (walk_state->walk_type == ACPI_WALK_METHOD) {
 289                         /*
 290                          * Found a named object declaration during method
 291                          * execution;  we must enter this object into the
 292                          * namespace.  The created object is temporary and
 293                          * will be deleted upon completion of the execution
 294                          * of this method.
 295                          */
 296                         status = acpi_ds_load2_begin_op (walk_state, NULL);
 297                 }
 298
 299                 if (op->common.aml_opcode == AML_REGION_OP) {
 300                         status = acpi_ds_result_stack_push (walk_state);
 301                 }
 302                 break;
 303
 304
 305         case AML_CLASS_EXECUTE:
 306         case AML_CLASS_CREATE:
 307
 308                 /* most operators with arguments */
 309                 /* Start a new result/operand state */
 310
 311                 status = acpi_ds_result_stack_push (walk_state);
 312                 break;
 313
 314
 315         default:
 316                 break;
 317         }
 318
 319         /* Nothing to do here during method execution */
 320
 321         return_ACPI_STATUS (status);
 322 }
 323
 324
 325 /*****************************************************************************
 326  *
 327  * FUNCTION:    acpi_ds_exec_end_op
 328  *
 329  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 330  *              Op              - Op that has been just been completed in the
 331  *                                walk;  Arguments have now been evaluated.
 332  *
 333  * RETURN:      Status
 334  *
 335  * DESCRIPTION: Ascending callback used during the execution of control
 336  *              methods.  The only thing we really need to do here is to
 337  *              notice the beginning of IF, ELSE, and WHILE blocks.
 338  *
 339  ****************************************************************************/
 340
 341 acpi_status
 342 acpi_ds_exec_end_op (
 343         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
 353         ACPI_FUNCTION_TRACE_PTR ("ds_exec_end_op", walk_state);
 354
 355
 356         op      = walk_state->op;
 357         op_type = walk_state->op_info->type;
 358         op_class = walk_state->op_info->class;
 359
 360         if (op_class == AML_CLASS_UNKNOWN) {
 361                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown opcode %X\n", op->common.aml_opcode));
 362                 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
 363         }
 364
 365         first_arg = op->common.value.arg;
 366
 367         /* Init the walk state */
 368
 369         walk_state->num_operands = 0;
 370         walk_state->return_desc = NULL;
 371         walk_state->result_obj = NULL;
 372
 373         /* Call debugger for single step support (DEBUG build only) */
 374
 375         ACPI_DEBUGGER_EXEC (status = acpi_db_single_step (walk_state, op, op_class));
 376         ACPI_DEBUGGER_EXEC (if (ACPI_FAILURE (status)) {return_ACPI_STATUS (status);});
 377
 378         /* Decode the Opcode Class */
 379
 380         switch (op_class) {
 381         case AML_CLASS_ARGUMENT:    /* constants, literals, etc. -- do nothing */
 382                 break;
 383
 384
 385         case AML_CLASS_EXECUTE:     /* most operators with arguments */
 386
 387                 /* Build resolved operand stack */
 388
 389                 status = acpi_ds_create_operands (walk_state, first_arg);
 390                 if (ACPI_FAILURE (status)) {
 391                         goto cleanup;
 392                 }
 393
 394                 /* Done with this result state (Now that operand stack is built) */
 395
 396                 status = acpi_ds_result_stack_pop (walk_state);
 397                 if (ACPI_FAILURE (status)) {
 398                         goto cleanup;
 399                 }
 400
 401                 /* Resolve all operands */
 402
 403                 status = acpi_ex_resolve_operands (walk_state->opcode,
 404                                   &(walk_state->operands [walk_state->num_operands -1]),
 405                                   walk_state);
 406                 if (ACPI_SUCCESS (status)) {
 407                         ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
 408                                           acpi_ps_get_opcode_name (walk_state->opcode),
 409                                           walk_state->num_operands, "after ex_resolve_operands");
 410
 411                         /*
 412                          * Dispatch the request to the appropriate interpreter handler
 413                          * routine.  There is one routine per opcode "type" based upon the
 414                          * number of opcode arguments and return type.
 415                          */
 416                         status = acpi_gbl_op_type_dispatch [op_type] (walk_state);
 417                 }
 418                 else {
 419                         /*
 420                          * Treat constructs of the form "Store(local_x,local_x)" as noops when the
 421                          * Local is uninitialized.
 422                          */
 423                         if  ((status == AE_AML_UNINITIALIZED_LOCAL) &&
 424                                 (walk_state->opcode == AML_STORE_OP) &&
 425                                 (walk_state->operands[0]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
 426                                 (walk_state->operands[1]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
 427                                 (walk_state->operands[0]->reference.opcode ==
 428                                  walk_state->operands[1]->reference.opcode)) {
 429                                 status = AE_OK;
 430                         }
 431                         else {
 432                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 433                                         "[%s]: Could not resolve operands, %s\n",
 434                                         acpi_ps_get_opcode_name (walk_state->opcode),
 435                                         acpi_format_exception (status)));
 436                         }
 437                 }
 438
 439                 /* Always delete the argument objects and clear the operand stack */
 440
 441                 acpi_ds_clear_operands (walk_state);
 442
 443                 /*
 444                  * If a result object was returned from above, push it on the
 445                  * current result stack
 446                  */
 447                 if (ACPI_SUCCESS (status) &&
 448                         walk_state->result_obj) {
 449                         status = acpi_ds_result_push (walk_state->result_obj, walk_state);
 450                 }
 451
 452                 break;
 453
 454
 455         default:
 456
 457                 switch (op_type) {
 458                 case AML_TYPE_CONTROL:    /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 459
 460                         /* 1 Operand, 0 external_result, 0 internal_result */
 461
 462                         status = acpi_ds_exec_end_control_op (walk_state, op);
 463                         if (ACPI_FAILURE (status)) {
 464                                 break;
 465                         }
 466
 467                         status = acpi_ds_result_stack_pop (walk_state);
 468                         break;
 469
 470
 471                 case AML_TYPE_METHOD_CALL:
 472
 473                         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method invocation, Op=%p\n", op));
 474
 475                         /*
 476                          * (AML_METHODCALL) Op->Value->Arg->Node contains
 477                          * the method Node pointer
 478                          */
 479                         /* next_op points to the op that holds the method name */
 480
 481                         next_op = first_arg;
 482
 483                         /* next_op points to first argument op */
 484
 485                         next_op = next_op->common.next;
 486
 487                         /*
 488                          * Get the method's arguments and put them on the operand stack
 489                          */
 490                         status = acpi_ds_create_operands (walk_state, next_op);
 491                         if (ACPI_FAILURE (status)) {
 492                                 break;
 493                         }
 494
 495                         /*
 496                          * Since the operands will be passed to another control method,
 497                          * we must resolve all local references here (Local variables,
 498                          * arguments to *this* method, etc.)
 499                          */
 500                         status = acpi_ds_resolve_operands (walk_state);
 501                         if (ACPI_FAILURE (status)) {
 502                                 /* On error, clear all resolved operands */
 503
 504                                 acpi_ds_clear_operands (walk_state);
 505                                 break;
 506                         }
 507
 508                         /*
 509                          * Tell the walk loop to preempt this running method and
 510                          * execute the new method
 511                          */
 512                         status = AE_CTRL_TRANSFER;
 513
 514                         /*
 515                          * Return now; we don't want to disturb anything,
 516                          * especially the operand count!
 517                          */
 518                         return_ACPI_STATUS (status);
 519
 520
 521                 case AML_TYPE_CREATE_FIELD:
 522
 523                         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 524                                 "Executing create_field Buffer/Index Op=%p\n", op));
 525
 526                         status = acpi_ds_load2_end_op (walk_state);
 527                         if (ACPI_FAILURE (status)) {
 528                                 break;
 529                         }
 530
 531                         status = acpi_ds_eval_buffer_field_operands (walk_state, op);
 532                         break;
 533
 534
 535                 case AML_TYPE_CREATE_OBJECT:
 536
 537                         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 538                                 "Executing create_object (Buffer/Package) Op=%p\n", op));
 539
 540                         switch (op->common.parent->common.aml_opcode) {
 541                         case AML_NAME_OP:
 542
 543                                 /*
 544                                  * Put the Node on the object stack (Contains the ACPI Name of
 545                                  * this object)
 546                                  */
 547                                 walk_state->operands[0] = (void *) op->common.parent->common.node;
 548                                 walk_state->num_operands = 1;
 549
 550                                 status = acpi_ds_create_node (walk_state, op->common.parent->common.node, op->common.parent);
 551                                 if (ACPI_FAILURE (status)) {
 552                                         break;
 553                                 }
 554
 555                                 /* Fall through */
 556                                 /*lint -fallthrough */
 557
 558                         case AML_INT_EVAL_SUBTREE_OP:
 559
 560                                 status = acpi_ds_eval_data_object_operands (walk_state, op,
 561                                                   acpi_ns_get_attached_object (op->common.parent->common.node));
 562                                 break;
 563
 564                         default:
 565
 566                                 status = acpi_ds_eval_data_object_operands (walk_state, op, NULL);
 567                                 break;
 568                         }
 569
 570                         /*
 571                          * If a result object was returned from above, push it on the
 572                          * current result stack
 573                          */
 574                         if (ACPI_SUCCESS (status) &&
 575                                 walk_state->result_obj) {
 576                                 status = acpi_ds_result_push (walk_state->result_obj, walk_state);
 577                         }
 578                         break;
 579
 580
 581                 case AML_TYPE_NAMED_FIELD:
 582                 case AML_TYPE_NAMED_COMPLEX:
 583                 case AML_TYPE_NAMED_SIMPLE:
 584                 case AML_TYPE_NAMED_NO_OBJ:
 585
 586                         status = acpi_ds_load2_end_op (walk_state);
 587                         if (ACPI_FAILURE (status)) {
 588                                 break;
 589                         }
 590
 591                         if (op->common.aml_opcode == AML_REGION_OP) {
 592                                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 593                                         "Executing op_region Address/Length Op=%p\n", op));
 594
 595                                 status = acpi_ds_eval_region_operands (walk_state, op);
 596                                 if (ACPI_FAILURE (status)) {
 597                                         break;
 598                                 }
 599
 600                                 status = acpi_ds_result_stack_pop (walk_state);
 601                         }
 602
 603                         break;
 604
 605
 606                 case AML_TYPE_UNDEFINED:
 607
 608                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Undefined opcode type Op=%p\n", op));
 609                         return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
 610
 611
 612                 case AML_TYPE_BOGUS:
 613
 614                         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 615                                 "Internal opcode=%X type Op=%p\n",
 616                                 walk_state->opcode, op));
 617                         break;
 618
 619
 620                 default:
 621
 622                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 623                                 "Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p\n",
 624                                 op_class, op_type, op->common.aml_opcode, op));
 625
 626                         status = AE_NOT_IMPLEMENTED;
 627                         break;
 628                 }
 629         }
 630
 631         /*
 632          * ACPI 2.0 support for 64-bit integers: Truncate numeric
 633          * result value if we are executing from a 32-bit ACPI table
 634          */
 635         acpi_ex_truncate_for32bit_table (walk_state->result_obj);
 636
 637         /*
 638          * Check if we just completed the evaluation of a
 639          * conditional predicate
 640          */
 641
 642         if ((walk_state->control_state) &&
 643                 (walk_state->control_state->common.state ==
 644                         ACPI_CONTROL_PREDICATE_EXECUTING) &&
 645                 (walk_state->control_state->control.predicate_op == op)) {
 646                 status = acpi_ds_get_predicate_value (walk_state, walk_state->result_obj);
 647                 walk_state->result_obj = NULL;
 648         }
 649
 650
 651 cleanup:
 652         if (walk_state->result_obj) {
 653                 /* Break to debugger to display result */
 654
 655                 ACPI_DEBUGGER_EXEC (acpi_db_display_result_object (walk_state->result_obj, walk_state));
 656
 657                 /*
 658                  * Delete the result op if and only if:
 659                  * Parent will not use the result -- such as any
 660                  * non-nested type2 op in a method (parent will be method)
 661                  */
 662                 acpi_ds_delete_result_if_not_used (op, walk_state->result_obj, walk_state);
 663         }
 664
 665 #ifdef _UNDER_DEVELOPMENT
 666
 667         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
 668                 acpi_db_method_end (walk_state);
 669         }
 670 #endif
 671
 672         /* Always clear the object stack */
 673
 674         walk_state->num_operands = 0;
 675
 676 #ifdef ACPI_DISASSEMBLER
 677
 678         /* On error, display method locals/args */
 679
 680         if (ACPI_FAILURE (status)) {
 681                 acpi_dm_dump_method_info (status, walk_state, op);
 682         }
 683 #endif
 684
 685         return_ACPI_STATUS (status);
 686 }
 687
 688