Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / dswexec.c
1 /******************************************************************************
2  *
3  * Module Name: dswexec - Dispatcher method execution callbacks;
4  *                        dispatch to interpreter.
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2012, Intel Corp.
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 "accommon.h"
47 #include "acparser.h"
48 #include "amlcode.h"
49 #include "acdispat.h"
50 #include "acinterp.h"
51 #include "acnamesp.h"
52 #include "acdebug.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_EXCEPTION((AE_INFO, status,
104                                         "Could not get result from predicate evaluation"));
105
106                         return_ACPI_STATUS(status);
107                 }
108         } else {
109                 status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
110                 if (ACPI_FAILURE(status)) {
111                         return_ACPI_STATUS(status);
112                 }
113
114                 status =
115                     acpi_ex_resolve_to_value(&walk_state->operands[0],
116                                              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_ERROR((AE_INFO,
126                             "No predicate ObjDesc=%p State=%p",
127                             obj_desc, walk_state));
128
129                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
130         }
131
132         /*
133          * Result of predicate evaluation must be an Integer
134          * object. Implicitly convert the argument if necessary.
135          */
136         status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc, 16);
137         if (ACPI_FAILURE(status)) {
138                 goto cleanup;
139         }
140
141         if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
142                 ACPI_ERROR((AE_INFO,
143                             "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
144                             obj_desc, walk_state, obj_desc->common.type));
145
146                 status = AE_AML_OPERAND_TYPE;
147                 goto cleanup;
148         }
149
150         /* Truncate the predicate to 32-bits if necessary */
151
152         acpi_ex_truncate_for32bit_table(local_obj_desc);
153
154         /*
155          * Save the result of the predicate evaluation on
156          * the control stack
157          */
158         if (local_obj_desc->integer.value) {
159                 walk_state->control_state->common.value = TRUE;
160         } else {
161                 /*
162                  * Predicate is FALSE, we will just toss the
163                  * rest of the package
164                  */
165                 walk_state->control_state->common.value = FALSE;
166                 status = AE_CTRL_FALSE;
167         }
168
169         /* Predicate can be used for an implicit return value */
170
171         (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
172
173       cleanup:
174
175         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
176                           walk_state->control_state->common.value,
177                           walk_state->op));
178
179         /* Break to debugger to display result */
180
181         ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
182                            (local_obj_desc, walk_state));
183
184         /*
185          * Delete the predicate result object (we know that
186          * we don't need it anymore)
187          */
188         if (local_obj_desc != obj_desc) {
189                 acpi_ut_remove_reference(local_obj_desc);
190         }
191         acpi_ut_remove_reference(obj_desc);
192
193         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
194         return_ACPI_STATUS(status);
195 }
196
197 /*****************************************************************************
198  *
199  * FUNCTION:    acpi_ds_exec_begin_op
200  *
201  * PARAMETERS:  walk_state      - Current state of the parse tree walk
202  *              out_op          - Where to return op if a new one is created
203  *
204  * RETURN:      Status
205  *
206  * DESCRIPTION: Descending callback used during the execution of control
207  *              methods.  This is where most operators and operands are
208  *              dispatched to the interpreter.
209  *
210  ****************************************************************************/
211
212 acpi_status
213 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
214                       union acpi_parse_object **out_op)
215 {
216         union acpi_parse_object *op;
217         acpi_status status = AE_OK;
218         u32 opcode_class;
219
220         ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
221
222         op = walk_state->op;
223         if (!op) {
224                 status = acpi_ds_load2_begin_op(walk_state, out_op);
225                 if (ACPI_FAILURE(status)) {
226                         goto error_exit;
227                 }
228
229                 op = *out_op;
230                 walk_state->op = op;
231                 walk_state->opcode = op->common.aml_opcode;
232                 walk_state->op_info =
233                     acpi_ps_get_opcode_info(op->common.aml_opcode);
234
235                 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
236                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
237                                           "(%s) Popping scope for Op %p\n",
238                                           acpi_ut_get_type_name(walk_state->
239                                                                 op_info->
240                                                                 object_type),
241                                           op));
242
243                         status = acpi_ds_scope_stack_pop(walk_state);
244                         if (ACPI_FAILURE(status)) {
245                                 goto error_exit;
246                         }
247                 }
248         }
249
250         if (op == walk_state->origin) {
251                 if (out_op) {
252                         *out_op = op;
253                 }
254
255                 return_ACPI_STATUS(AE_OK);
256         }
257
258         /*
259          * If the previous opcode was a conditional, this opcode
260          * must be the beginning of the associated predicate.
261          * Save this knowledge in the current scope descriptor
262          */
263         if ((walk_state->control_state) &&
264             (walk_state->control_state->common.state ==
265              ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
266                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
267                                   "Exec predicate Op=%p State=%p\n", op,
268                                   walk_state));
269
270                 walk_state->control_state->common.state =
271                     ACPI_CONTROL_PREDICATE_EXECUTING;
272
273                 /* Save start of predicate */
274
275                 walk_state->control_state->control.predicate_op = op;
276         }
277
278         opcode_class = walk_state->op_info->class;
279
280         /* We want to send namepaths to the load code */
281
282         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
283                 opcode_class = AML_CLASS_NAMED_OBJECT;
284         }
285
286         /*
287          * Handle the opcode based upon the opcode type
288          */
289         switch (opcode_class) {
290         case AML_CLASS_CONTROL:
291
292                 status = acpi_ds_exec_begin_control_op(walk_state, op);
293                 break;
294
295         case AML_CLASS_NAMED_OBJECT:
296
297                 if (walk_state->walk_type & ACPI_WALK_METHOD) {
298                         /*
299                          * Found a named object declaration during method execution;
300                          * we must enter this object into the namespace.  The created
301                          * object is temporary and will be deleted upon completion of
302                          * the execution of this method.
303                          *
304                          * Note 10/2010: Except for the Scope() op. This opcode does
305                          * not actually create a new object, it refers to an existing
306                          * object. However, for Scope(), we want to indeed open a
307                          * new scope.
308                          */
309                         if (op->common.aml_opcode != AML_SCOPE_OP) {
310                                 status =
311                                     acpi_ds_load2_begin_op(walk_state, NULL);
312                         } else {
313                                 status =
314                                     acpi_ds_scope_stack_push(op->named.node,
315                                                              op->named.node->
316                                                              type, walk_state);
317                                 if (ACPI_FAILURE(status)) {
318                                         return_ACPI_STATUS(status);
319                                 }
320                         }
321                 }
322                 break;
323
324         case AML_CLASS_EXECUTE:
325         case AML_CLASS_CREATE:
326
327                 break;
328
329         default:
330                 break;
331         }
332
333         /* Nothing to do here during method execution */
334
335         return_ACPI_STATUS(status);
336
337       error_exit:
338         status = acpi_ds_method_error(status, walk_state);
339         return_ACPI_STATUS(status);
340 }
341
342 /*****************************************************************************
343  *
344  * FUNCTION:    acpi_ds_exec_end_op
345  *
346  * PARAMETERS:  walk_state      - Current state of the parse tree walk
347  *
348  * RETURN:      Status
349  *
350  * DESCRIPTION: Ascending callback used during the execution of control
351  *              methods.  The only thing we really need to do here is to
352  *              notice the beginning of IF, ELSE, and WHILE blocks.
353  *
354  ****************************************************************************/
355
356 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
357 {
358         union acpi_parse_object *op;
359         acpi_status status = AE_OK;
360         u32 op_type;
361         u32 op_class;
362         union acpi_parse_object *next_op;
363         union acpi_parse_object *first_arg;
364
365         ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
366
367         op = walk_state->op;
368         op_type = walk_state->op_info->type;
369         op_class = walk_state->op_info->class;
370
371         if (op_class == AML_CLASS_UNKNOWN) {
372                 ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
373                             op->common.aml_opcode));
374                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
375         }
376
377         first_arg = op->common.value.arg;
378
379         /* Init the walk state */
380
381         walk_state->num_operands = 0;
382         walk_state->operand_index = 0;
383         walk_state->return_desc = NULL;
384         walk_state->result_obj = NULL;
385
386         /* Call debugger for single step support (DEBUG build only) */
387
388         ACPI_DEBUGGER_EXEC(status =
389                            acpi_db_single_step(walk_state, op, op_class));
390         ACPI_DEBUGGER_EXEC(if (ACPI_FAILURE(status)) {
391                            return_ACPI_STATUS(status);}
392         ) ;
393
394         /* Decode the Opcode Class */
395
396         switch (op_class) {
397         case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */
398
399                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
400                         status = acpi_ds_evaluate_name_path(walk_state);
401                         if (ACPI_FAILURE(status)) {
402                                 goto cleanup;
403                         }
404                 }
405                 break;
406
407         case AML_CLASS_EXECUTE: /* Most operators with arguments */
408
409                 /* Build resolved operand stack */
410
411                 status = acpi_ds_create_operands(walk_state, first_arg);
412                 if (ACPI_FAILURE(status)) {
413                         goto cleanup;
414                 }
415
416                 /*
417                  * All opcodes require operand resolution, with the only exceptions
418                  * being the object_type and size_of operators.
419                  */
420                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
421
422                         /* Resolve all operands */
423
424                         status = acpi_ex_resolve_operands(walk_state->opcode,
425                                                           &(walk_state->
426                                                             operands
427                                                             [walk_state->
428                                                              num_operands - 1]),
429                                                           walk_state);
430                 }
431
432                 if (ACPI_SUCCESS(status)) {
433                         /*
434                          * Dispatch the request to the appropriate interpreter handler
435                          * routine.  There is one routine per opcode "type" based upon the
436                          * number of opcode arguments and return type.
437                          */
438                         status =
439                             acpi_gbl_op_type_dispatch[op_type] (walk_state);
440                 } else {
441                         /*
442                          * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
443                          * Local is uninitialized.
444                          */
445                         if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
446                             (walk_state->opcode == AML_STORE_OP) &&
447                             (walk_state->operands[0]->common.type ==
448                              ACPI_TYPE_LOCAL_REFERENCE)
449                             && (walk_state->operands[1]->common.type ==
450                                 ACPI_TYPE_LOCAL_REFERENCE)
451                             && (walk_state->operands[0]->reference.class ==
452                                 walk_state->operands[1]->reference.class)
453                             && (walk_state->operands[0]->reference.value ==
454                                 walk_state->operands[1]->reference.value)) {
455                                 status = AE_OK;
456                         } else {
457                                 ACPI_EXCEPTION((AE_INFO, status,
458                                                 "While resolving operands for [%s]",
459                                                 acpi_ps_get_opcode_name
460                                                 (walk_state->opcode)));
461                         }
462                 }
463
464                 /* Always delete the argument objects and clear the operand stack */
465
466                 acpi_ds_clear_operands(walk_state);
467
468                 /*
469                  * If a result object was returned from above, push it on the
470                  * current result stack
471                  */
472                 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
473                         status =
474                             acpi_ds_result_push(walk_state->result_obj,
475                                                 walk_state);
476                 }
477                 break;
478
479         default:
480
481                 switch (op_type) {
482                 case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
483
484                         /* 1 Operand, 0 external_result, 0 internal_result */
485
486                         status = acpi_ds_exec_end_control_op(walk_state, op);
487
488                         break;
489
490                 case AML_TYPE_METHOD_CALL:
491
492                         /*
493                          * If the method is referenced from within a package
494                          * declaration, it is not a invocation of the method, just
495                          * a reference to it.
496                          */
497                         if ((op->asl.parent) &&
498                             ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
499                              || (op->asl.parent->asl.aml_opcode ==
500                                  AML_VAR_PACKAGE_OP))) {
501                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
502                                                   "Method Reference in a Package, Op=%p\n",
503                                                   op));
504
505                                 op->common.node =
506                                     (struct acpi_namespace_node *)op->asl.value.
507                                     arg->asl.node;
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
544                                 /* On error, clear all resolved operands */
545
546                                 acpi_ds_clear_operands(walk_state);
547                                 break;
548                         }
549
550                         /*
551                          * Tell the walk loop to preempt this running method and
552                          * execute the new method
553                          */
554                         status = AE_CTRL_TRANSFER;
555
556                         /*
557                          * Return now; we don't want to disturb anything,
558                          * especially the operand count!
559                          */
560                         return_ACPI_STATUS(status);
561
562                 case AML_TYPE_CREATE_FIELD:
563
564                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
565                                           "Executing CreateField Buffer/Index Op=%p\n",
566                                           op));
567
568                         status = acpi_ds_load2_end_op(walk_state);
569                         if (ACPI_FAILURE(status)) {
570                                 break;
571                         }
572
573                         status =
574                             acpi_ds_eval_buffer_field_operands(walk_state, op);
575                         break;
576
577                 case AML_TYPE_CREATE_OBJECT:
578
579                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
580                                           "Executing CreateObject (Buffer/Package) Op=%p\n",
581                                           op));
582
583                         switch (op->common.parent->common.aml_opcode) {
584                         case AML_NAME_OP:
585
586                                 /*
587                                  * Put the Node on the object stack (Contains the ACPI Name
588                                  * of this object)
589                                  */
590                                 walk_state->operands[0] =
591                                     (void *)op->common.parent->common.node;
592                                 walk_state->num_operands = 1;
593
594                                 status = acpi_ds_create_node(walk_state,
595                                                              op->common.parent->
596                                                              common.node,
597                                                              op->common.parent);
598                                 if (ACPI_FAILURE(status)) {
599                                         break;
600                                 }
601
602                                 /* Fall through */
603                                 /*lint -fallthrough */
604
605                         case AML_INT_EVAL_SUBTREE_OP:
606
607                                 status =
608                                     acpi_ds_eval_data_object_operands
609                                     (walk_state, op,
610                                      acpi_ns_get_attached_object(op->common.
611                                                                  parent->common.
612                                                                  node));
613                                 break;
614
615                         default:
616
617                                 status =
618                                     acpi_ds_eval_data_object_operands
619                                     (walk_state, op, NULL);
620                                 break;
621                         }
622
623                         /*
624                          * If a result object was returned from above, push it on the
625                          * current result stack
626                          */
627                         if (walk_state->result_obj) {
628                                 status =
629                                     acpi_ds_result_push(walk_state->result_obj,
630                                                         walk_state);
631                         }
632                         break;
633
634                 case AML_TYPE_NAMED_FIELD:
635                 case AML_TYPE_NAMED_COMPLEX:
636                 case AML_TYPE_NAMED_SIMPLE:
637                 case AML_TYPE_NAMED_NO_OBJ:
638
639                         status = acpi_ds_load2_end_op(walk_state);
640                         if (ACPI_FAILURE(status)) {
641                                 break;
642                         }
643
644                         if (op->common.aml_opcode == AML_REGION_OP) {
645                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
646                                                   "Executing OpRegion Address/Length Op=%p\n",
647                                                   op));
648
649                                 status =
650                                     acpi_ds_eval_region_operands(walk_state,
651                                                                  op);
652                                 if (ACPI_FAILURE(status)) {
653                                         break;
654                                 }
655                         } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
656                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
657                                                   "Executing DataTableRegion Strings Op=%p\n",
658                                                   op));
659
660                                 status =
661                                     acpi_ds_eval_table_region_operands
662                                     (walk_state, op);
663                                 if (ACPI_FAILURE(status)) {
664                                         break;
665                                 }
666                         } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
667                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
668                                                   "Executing BankField Op=%p\n",
669                                                   op));
670
671                                 status =
672                                     acpi_ds_eval_bank_field_operands(walk_state,
673                                                                      op);
674                                 if (ACPI_FAILURE(status)) {
675                                         break;
676                                 }
677                         }
678                         break;
679
680                 case AML_TYPE_UNDEFINED:
681
682                         ACPI_ERROR((AE_INFO,
683                                     "Undefined opcode type Op=%p", op));
684                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
685
686                 case AML_TYPE_BOGUS:
687
688                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
689                                           "Internal opcode=%X type Op=%p\n",
690                                           walk_state->opcode, op));
691                         break;
692
693                 default:
694
695                         ACPI_ERROR((AE_INFO,
696                                     "Unimplemented opcode, class=0x%X type=0x%X Opcode=-0x%X Op=%p",
697                                     op_class, op_type, op->common.aml_opcode,
698                                     op));
699
700                         status = AE_NOT_IMPLEMENTED;
701                         break;
702                 }
703         }
704
705         /*
706          * ACPI 2.0 support for 64-bit integers: Truncate numeric
707          * result value if we are executing from a 32-bit ACPI table
708          */
709         acpi_ex_truncate_for32bit_table(walk_state->result_obj);
710
711         /*
712          * Check if we just completed the evaluation of a
713          * conditional predicate
714          */
715         if ((ACPI_SUCCESS(status)) &&
716             (walk_state->control_state) &&
717             (walk_state->control_state->common.state ==
718              ACPI_CONTROL_PREDICATE_EXECUTING) &&
719             (walk_state->control_state->control.predicate_op == op)) {
720                 status =
721                     acpi_ds_get_predicate_value(walk_state,
722                                                 walk_state->result_obj);
723                 walk_state->result_obj = NULL;
724         }
725
726       cleanup:
727
728         if (walk_state->result_obj) {
729
730                 /* Break to debugger to display result */
731
732                 ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
733                                    (walk_state->result_obj, walk_state));
734
735                 /*
736                  * Delete the result op if and only if:
737                  * Parent will not use the result -- such as any
738                  * non-nested type2 op in a method (parent will be method)
739                  */
740                 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
741                                                   walk_state);
742         }
743 #ifdef _UNDER_DEVELOPMENT
744
745         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
746                 acpi_db_method_end(walk_state);
747         }
748 #endif
749
750         /* Invoke exception handler on error */
751
752         if (ACPI_FAILURE(status)) {
753                 status = acpi_ds_method_error(status, walk_state);
754         }
755
756         /* Always clear the object stack */
757
758         walk_state->num_operands = 0;
759         return_ACPI_STATUS(status);
760 }