1 /*******************************************************************************
2 *
3 * Module Name: dsutils - Dispatcher utilities
4 *
5 ******************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2023, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152 #include "acpi.h"
153 #include "accommon.h"
154 #include "acparser.h"
155 #include "amlcode.h"
156 #include "acdispat.h"
157 #include "acinterp.h"
158 #include "acnamesp.h"
159 #include "acdebug.h"
160
161 #define _COMPONENT ACPI_DISPATCHER
162 ACPI_MODULE_NAME ("dsutils")
163
164
165 /*******************************************************************************
166 *
167 * FUNCTION: AcpiDsClearImplicitReturn
168 *
169 * PARAMETERS: WalkState - Current State
170 *
171 * RETURN: None.
172 *
173 * DESCRIPTION: Clear and remove a reference on an implicit return value. Used
174 * to delete "stale" return values (if enabled, the return value
175 * from every operator is saved at least momentarily, in case the
176 * parent method exits.)
177 *
178 ******************************************************************************/
179
180 void
AcpiDsClearImplicitReturn(ACPI_WALK_STATE * WalkState)181 AcpiDsClearImplicitReturn (
182 ACPI_WALK_STATE *WalkState)
183 {
184 ACPI_FUNCTION_NAME (DsClearImplicitReturn);
185
186
187 /*
188 * Slack must be enabled for this feature
189 */
190 if (!AcpiGbl_EnableInterpreterSlack)
191 {
192 return;
193 }
194
195 if (WalkState->ImplicitReturnObj)
196 {
197 /*
198 * Delete any "stale" implicit return. However, in
199 * complex statements, the implicit return value can be
200 * bubbled up several levels.
201 */
202 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
203 "Removing reference on stale implicit return obj %p\n",
204 WalkState->ImplicitReturnObj));
205
206 AcpiUtRemoveReference (WalkState->ImplicitReturnObj);
207 WalkState->ImplicitReturnObj = NULL;
208 }
209 }
210
211
212 /*******************************************************************************
213 *
214 * FUNCTION: AcpiDsDoImplicitReturn
215 *
216 * PARAMETERS: ReturnDesc - The return value
217 * WalkState - Current State
218 * AddReference - True if a reference should be added to the
219 * return object
220 *
221 * RETURN: TRUE if implicit return enabled, FALSE otherwise
222 *
223 * DESCRIPTION: Implements the optional "implicit return". We save the result
224 * of every ASL operator and control method invocation in case the
225 * parent method exit. Before storing a new return value, we
226 * delete the previous return value.
227 *
228 ******************************************************************************/
229
230 BOOLEAN
AcpiDsDoImplicitReturn(ACPI_OPERAND_OBJECT * ReturnDesc,ACPI_WALK_STATE * WalkState,BOOLEAN AddReference)231 AcpiDsDoImplicitReturn (
232 ACPI_OPERAND_OBJECT *ReturnDesc,
233 ACPI_WALK_STATE *WalkState,
234 BOOLEAN AddReference)
235 {
236 ACPI_FUNCTION_NAME (DsDoImplicitReturn);
237
238
239 /*
240 * Slack must be enabled for this feature, and we must
241 * have a valid return object
242 */
243 if ((!AcpiGbl_EnableInterpreterSlack) ||
244 (!ReturnDesc))
245 {
246 return (FALSE);
247 }
248
249 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
250 "Result %p will be implicitly returned; Prev=%p\n",
251 ReturnDesc,
252 WalkState->ImplicitReturnObj));
253
254 /*
255 * Delete any "stale" implicit return value first. However, in
256 * complex statements, the implicit return value can be
257 * bubbled up several levels, so we don't clear the value if it
258 * is the same as the ReturnDesc.
259 */
260 if (WalkState->ImplicitReturnObj)
261 {
262 if (WalkState->ImplicitReturnObj == ReturnDesc)
263 {
264 return (TRUE);
265 }
266 AcpiDsClearImplicitReturn (WalkState);
267 }
268
269 /* Save the implicit return value, add a reference if requested */
270
271 WalkState->ImplicitReturnObj = ReturnDesc;
272 if (AddReference)
273 {
274 AcpiUtAddReference (ReturnDesc);
275 }
276
277 return (TRUE);
278 }
279
280
281 /*******************************************************************************
282 *
283 * FUNCTION: AcpiDsIsResultUsed
284 *
285 * PARAMETERS: Op - Current Op
286 * WalkState - Current State
287 *
288 * RETURN: TRUE if result is used, FALSE otherwise
289 *
290 * DESCRIPTION: Check if a result object will be used by the parent
291 *
292 ******************************************************************************/
293
294 BOOLEAN
AcpiDsIsResultUsed(ACPI_PARSE_OBJECT * Op,ACPI_WALK_STATE * WalkState)295 AcpiDsIsResultUsed (
296 ACPI_PARSE_OBJECT *Op,
297 ACPI_WALK_STATE *WalkState)
298 {
299 const ACPI_OPCODE_INFO *ParentInfo;
300
301 ACPI_FUNCTION_TRACE_PTR (DsIsResultUsed, Op);
302
303
304 /* Must have both an Op and a Result Object */
305
306 if (!Op)
307 {
308 ACPI_ERROR ((AE_INFO, "Null Op"));
309 return_UINT8 (TRUE);
310 }
311
312 /*
313 * We know that this operator is not a
314 * Return() operator (would not come here.) The following code is the
315 * optional support for a so-called "implicit return". Some AML code
316 * assumes that the last value of the method is "implicitly" returned
317 * to the caller. Just save the last result as the return value.
318 * NOTE: this is optional because the ASL language does not actually
319 * support this behavior.
320 */
321 (void) AcpiDsDoImplicitReturn (WalkState->ResultObj, WalkState, TRUE);
322
323 /*
324 * Now determine if the parent will use the result
325 *
326 * If there is no parent, or the parent is a ScopeOp, we are executing
327 * at the method level. An executing method typically has no parent,
328 * since each method is parsed separately. A method invoked externally
329 * via ExecuteControlMethod has a ScopeOp as the parent.
330 */
331 if ((!Op->Common.Parent) ||
332 (Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP))
333 {
334 /* No parent, the return value cannot possibly be used */
335
336 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
337 "At Method level, result of [%s] not used\n",
338 AcpiPsGetOpcodeName (Op->Common.AmlOpcode)));
339 return_UINT8 (FALSE);
340 }
341
342 /* Get info on the parent. The RootOp is AML_SCOPE */
343
344 ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode);
345 if (ParentInfo->Class == AML_CLASS_UNKNOWN)
346 {
347 ACPI_ERROR ((AE_INFO,
348 "Unknown parent opcode Op=%p", Op));
349 return_UINT8 (FALSE);
350 }
351
352 /*
353 * Decide what to do with the result based on the parent. If
354 * the parent opcode will not use the result, delete the object.
355 * Otherwise leave it as is, it will be deleted when it is used
356 * as an operand later.
357 */
358 switch (ParentInfo->Class)
359 {
360 case AML_CLASS_CONTROL:
361
362 switch (Op->Common.Parent->Common.AmlOpcode)
363 {
364 case AML_RETURN_OP:
365
366 /* Never delete the return value associated with a return opcode */
367
368 goto ResultUsed;
369
370 case AML_IF_OP:
371 case AML_WHILE_OP:
372 /*
373 * If we are executing the predicate AND this is the predicate op,
374 * we will use the return value
375 */
376 if ((WalkState->ControlState->Common.State ==
377 ACPI_CONTROL_PREDICATE_EXECUTING) &&
378 (WalkState->ControlState->Control.PredicateOp == Op))
379 {
380 goto ResultUsed;
381 }
382 break;
383
384 default:
385
386 /* Ignore other control opcodes */
387
388 break;
389 }
390
391 /* The general control opcode returns no result */
392
393 goto ResultNotUsed;
394
395 case AML_CLASS_CREATE:
396 /*
397 * These opcodes allow TermArg(s) as operands and therefore
398 * the operands can be method calls. The result is used.
399 */
400 goto ResultUsed;
401
402 case AML_CLASS_NAMED_OBJECT:
403
404 if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP) ||
405 (Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP) ||
406 (Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
407 (Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP) ||
408 (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP) ||
409 (Op->Common.Parent->Common.AmlOpcode == AML_INT_EVAL_SUBTREE_OP) ||
410 (Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP))
411 {
412 /*
413 * These opcodes allow TermArg(s) as operands and therefore
414 * the operands can be method calls. The result is used.
415 */
416 goto ResultUsed;
417 }
418
419 goto ResultNotUsed;
420
421 default:
422 /*
423 * In all other cases. the parent will actually use the return
424 * object, so keep it.
425 */
426 goto ResultUsed;
427 }
428
429
430 ResultUsed:
431 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
432 "Result of [%s] used by Parent [%s] Op=%p\n",
433 AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
434 AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op));
435
436 return_UINT8 (TRUE);
437
438
439 ResultNotUsed:
440 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
441 "Result of [%s] not used by Parent [%s] Op=%p\n",
442 AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
443 AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op));
444
445 return_UINT8 (FALSE);
446 }
447
448
449 /*******************************************************************************
450 *
451 * FUNCTION: AcpiDsDeleteResultIfNotUsed
452 *
453 * PARAMETERS: Op - Current parse Op
454 * ResultObj - Result of the operation
455 * WalkState - Current state
456 *
457 * RETURN: Status
458 *
459 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
460 * result descriptor, check if the parent opcode will actually use
461 * this result. If not, delete the result now so that it will
462 * not become orphaned.
463 *
464 ******************************************************************************/
465
466 void
AcpiDsDeleteResultIfNotUsed(ACPI_PARSE_OBJECT * Op,ACPI_OPERAND_OBJECT * ResultObj,ACPI_WALK_STATE * WalkState)467 AcpiDsDeleteResultIfNotUsed (
468 ACPI_PARSE_OBJECT *Op,
469 ACPI_OPERAND_OBJECT *ResultObj,
470 ACPI_WALK_STATE *WalkState)
471 {
472 ACPI_OPERAND_OBJECT *ObjDesc;
473 ACPI_STATUS Status;
474
475
476 ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed, ResultObj);
477
478
479 if (!Op)
480 {
481 ACPI_ERROR ((AE_INFO, "Null Op"));
482 return_VOID;
483 }
484
485 if (!ResultObj)
486 {
487 return_VOID;
488 }
489
490 if (!AcpiDsIsResultUsed (Op, WalkState))
491 {
492 /* Must pop the result stack (ObjDesc should be equal to ResultObj) */
493
494 Status = AcpiDsResultPop (&ObjDesc, WalkState);
495 if (ACPI_SUCCESS (Status))
496 {
497 AcpiUtRemoveReference (ResultObj);
498 }
499 }
500
501 return_VOID;
502 }
503
504
505 /*******************************************************************************
506 *
507 * FUNCTION: AcpiDsResolveOperands
508 *
509 * PARAMETERS: WalkState - Current walk state with operands on stack
510 *
511 * RETURN: Status
512 *
513 * DESCRIPTION: Resolve all operands to their values. Used to prepare
514 * arguments to a control method invocation (a call from one
515 * method to another.)
516 *
517 ******************************************************************************/
518
519 ACPI_STATUS
AcpiDsResolveOperands(ACPI_WALK_STATE * WalkState)520 AcpiDsResolveOperands (
521 ACPI_WALK_STATE *WalkState)
522 {
523 UINT32 i;
524 ACPI_STATUS Status = AE_OK;
525
526
527 ACPI_FUNCTION_TRACE_PTR (DsResolveOperands, WalkState);
528
529
530 /*
531 * Attempt to resolve each of the valid operands
532 * Method arguments are passed by reference, not by value. This means
533 * that the actual objects are passed, not copies of the objects.
534 */
535 for (i = 0; i < WalkState->NumOperands; i++)
536 {
537 Status = AcpiExResolveToValue (&WalkState->Operands[i], WalkState);
538 if (ACPI_FAILURE (Status))
539 {
540 break;
541 }
542 }
543
544 return_ACPI_STATUS (Status);
545 }
546
547
548 /*******************************************************************************
549 *
550 * FUNCTION: AcpiDsClearOperands
551 *
552 * PARAMETERS: WalkState - Current walk state with operands on stack
553 *
554 * RETURN: None
555 *
556 * DESCRIPTION: Clear all operands on the current walk state operand stack.
557 *
558 ******************************************************************************/
559
560 void
AcpiDsClearOperands(ACPI_WALK_STATE * WalkState)561 AcpiDsClearOperands (
562 ACPI_WALK_STATE *WalkState)
563 {
564 UINT32 i;
565
566
567 ACPI_FUNCTION_TRACE_PTR (DsClearOperands, WalkState);
568
569
570 /* Remove a reference on each operand on the stack */
571
572 for (i = 0; i < WalkState->NumOperands; i++)
573 {
574 /*
575 * Remove a reference to all operands, including both
576 * "Arguments" and "Targets".
577 */
578 AcpiUtRemoveReference (WalkState->Operands[i]);
579 WalkState->Operands[i] = NULL;
580 }
581
582 WalkState->NumOperands = 0;
583 return_VOID;
584 }
585
586
587 /*******************************************************************************
588 *
589 * FUNCTION: AcpiDsCreateOperand
590 *
591 * PARAMETERS: WalkState - Current walk state
592 * Arg - Parse object for the argument
593 * ArgIndex - Which argument (zero based)
594 *
595 * RETURN: Status
596 *
597 * DESCRIPTION: Translate a parse tree object that is an argument to an AML
598 * opcode to the equivalent interpreter object. This may include
599 * looking up a name or entering a new name into the internal
600 * namespace.
601 *
602 ******************************************************************************/
603
604 ACPI_STATUS
AcpiDsCreateOperand(ACPI_WALK_STATE * WalkState,ACPI_PARSE_OBJECT * Arg,UINT32 ArgIndex)605 AcpiDsCreateOperand (
606 ACPI_WALK_STATE *WalkState,
607 ACPI_PARSE_OBJECT *Arg,
608 UINT32 ArgIndex)
609 {
610 ACPI_STATUS Status = AE_OK;
611 char *NameString;
612 UINT32 NameLength;
613 ACPI_OPERAND_OBJECT *ObjDesc;
614 ACPI_PARSE_OBJECT *ParentOp;
615 UINT16 Opcode;
616 ACPI_INTERPRETER_MODE InterpreterMode;
617 const ACPI_OPCODE_INFO *OpInfo;
618
619
620 ACPI_FUNCTION_TRACE_PTR (DsCreateOperand, Arg);
621
622
623 /* A valid name must be looked up in the namespace */
624
625 if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
626 (Arg->Common.Value.String) &&
627 !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
628 {
629 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", Arg));
630
631 /* Get the entire name string from the AML stream */
632
633 Status = AcpiExGetNameString (ACPI_TYPE_ANY,
634 Arg->Common.Value.Buffer, &NameString, &NameLength);
635
636 if (ACPI_FAILURE (Status))
637 {
638 return_ACPI_STATUS (Status);
639 }
640
641 /* All prefixes have been handled, and the name is in NameString */
642
643 /*
644 * Special handling for BufferField declarations. This is a deferred
645 * opcode that unfortunately defines the field name as the last
646 * parameter instead of the first. We get here when we are performing
647 * the deferred execution, so the actual name of the field is already
648 * in the namespace. We don't want to attempt to look it up again
649 * because we may be executing in a different scope than where the
650 * actual opcode exists.
651 */
652 if ((WalkState->DeferredNode) &&
653 (WalkState->DeferredNode->Type == ACPI_TYPE_BUFFER_FIELD) &&
654 (ArgIndex == (UINT32)
655 ((WalkState->Opcode == AML_CREATE_FIELD_OP) ? 3 : 2)))
656 {
657 ObjDesc = ACPI_CAST_PTR (
658 ACPI_OPERAND_OBJECT, WalkState->DeferredNode);
659 Status = AE_OK;
660 }
661 else /* All other opcodes */
662 {
663 /*
664 * Differentiate between a namespace "create" operation
665 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
666 * IMODE_EXECUTE) in order to support the creation of
667 * namespace objects during the execution of control methods.
668 */
669 ParentOp = Arg->Common.Parent;
670 OpInfo = AcpiPsGetOpcodeInfo (ParentOp->Common.AmlOpcode);
671
672 if ((OpInfo->Flags & AML_NSNODE) &&
673 (ParentOp->Common.AmlOpcode != AML_INT_METHODCALL_OP) &&
674 (ParentOp->Common.AmlOpcode != AML_REGION_OP) &&
675 (ParentOp->Common.AmlOpcode != AML_INT_NAMEPATH_OP))
676 {
677 /* Enter name into namespace if not found */
678
679 InterpreterMode = ACPI_IMODE_LOAD_PASS2;
680 }
681 else
682 {
683 /* Return a failure if name not found */
684
685 InterpreterMode = ACPI_IMODE_EXECUTE;
686 }
687
688 Status = AcpiNsLookup (WalkState->ScopeInfo, NameString,
689 ACPI_TYPE_ANY, InterpreterMode,
690 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, WalkState,
691 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ObjDesc));
692 /*
693 * The only case where we pass through (ignore) a NOT_FOUND
694 * error is for the CondRefOf opcode.
695 */
696 if (Status == AE_NOT_FOUND)
697 {
698 if (ParentOp->Common.AmlOpcode == AML_CONDITIONAL_REF_OF_OP)
699 {
700 /*
701 * For the Conditional Reference op, it's OK if
702 * the name is not found; We just need a way to
703 * indicate this to the interpreter, set the
704 * object to the root
705 */
706 ObjDesc = ACPI_CAST_PTR (
707 ACPI_OPERAND_OBJECT, AcpiGbl_RootNode);
708 Status = AE_OK;
709 }
710 else if (ParentOp->Common.AmlOpcode == AML_EXTERNAL_OP)
711 {
712 /*
713 * This opcode should never appear here. It is used only
714 * by AML disassemblers and is surrounded by an If(0)
715 * by the ASL compiler.
716 *
717 * Therefore, if we see it here, it is a serious error.
718 */
719 Status = AE_AML_BAD_OPCODE;
720 }
721 else
722 {
723 /*
724 * We just plain didn't find it -- which is a
725 * very serious error at this point
726 */
727 Status = AE_AML_NAME_NOT_FOUND;
728 }
729 }
730
731 if (ACPI_FAILURE (Status))
732 {
733 ACPI_ERROR_NAMESPACE (WalkState->ScopeInfo,
734 NameString, Status);
735 }
736 }
737
738 /* Free the namestring created above */
739
740 ACPI_FREE (NameString);
741
742 /* Check status from the lookup */
743
744 if (ACPI_FAILURE (Status))
745 {
746 return_ACPI_STATUS (Status);
747 }
748
749 /* Put the resulting object onto the current object stack */
750
751 Status = AcpiDsObjStackPush (ObjDesc, WalkState);
752 if (ACPI_FAILURE (Status))
753 {
754 return_ACPI_STATUS (Status);
755 }
756
757 AcpiDbDisplayArgumentObject (ObjDesc, WalkState);
758 }
759 else
760 {
761 /* Check for null name case */
762
763 if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
764 !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
765 {
766 /*
767 * If the name is null, this means that this is an
768 * optional result parameter that was not specified
769 * in the original ASL. Create a Zero Constant for a
770 * placeholder. (Store to a constant is a Noop.)
771 */
772 Opcode = AML_ZERO_OP; /* Has no arguments! */
773
774 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
775 "Null namepath: Arg=%p\n", Arg));
776 }
777 else
778 {
779 Opcode = Arg->Common.AmlOpcode;
780 }
781
782 /* Get the object type of the argument */
783
784 OpInfo = AcpiPsGetOpcodeInfo (Opcode);
785 if (OpInfo->ObjectType == ACPI_TYPE_INVALID)
786 {
787 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
788 }
789
790 if ((OpInfo->Flags & AML_HAS_RETVAL) ||
791 (Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
792 {
793 /*
794 * Use value that was already previously returned
795 * by the evaluation of this argument
796 */
797 Status = AcpiDsResultPop (&ObjDesc, WalkState);
798 if (ACPI_FAILURE (Status))
799 {
800 /*
801 * Only error is underflow, and this indicates
802 * a missing or null operand!
803 */
804 ACPI_EXCEPTION ((AE_INFO, Status,
805 "Missing or null operand"));
806 return_ACPI_STATUS (Status);
807 }
808 }
809 else
810 {
811 /* Create an ACPI_INTERNAL_OBJECT for the argument */
812
813 ObjDesc = AcpiUtCreateInternalObject (OpInfo->ObjectType);
814 if (!ObjDesc)
815 {
816 return_ACPI_STATUS (AE_NO_MEMORY);
817 }
818
819 /* Initialize the new object */
820
821 Status = AcpiDsInitObjectFromOp (
822 WalkState, Arg, Opcode, &ObjDesc);
823 if (ACPI_FAILURE (Status))
824 {
825 AcpiUtDeleteObjectDesc (ObjDesc);
826 return_ACPI_STATUS (Status);
827 }
828 }
829
830 /* Put the operand object on the object stack */
831
832 Status = AcpiDsObjStackPush (ObjDesc, WalkState);
833 if (ACPI_FAILURE (Status))
834 {
835 return_ACPI_STATUS (Status);
836 }
837
838 AcpiDbDisplayArgumentObject (ObjDesc, WalkState);
839 }
840
841 return_ACPI_STATUS (AE_OK);
842 }
843
844
845 /*******************************************************************************
846 *
847 * FUNCTION: AcpiDsCreateOperands
848 *
849 * PARAMETERS: WalkState - Current state
850 * FirstArg - First argument of a parser argument tree
851 *
852 * RETURN: Status
853 *
854 * DESCRIPTION: Convert an operator's arguments from a parse tree format to
855 * namespace objects and place those argument object on the object
856 * stack in preparation for evaluation by the interpreter.
857 *
858 ******************************************************************************/
859
860 ACPI_STATUS
AcpiDsCreateOperands(ACPI_WALK_STATE * WalkState,ACPI_PARSE_OBJECT * FirstArg)861 AcpiDsCreateOperands (
862 ACPI_WALK_STATE *WalkState,
863 ACPI_PARSE_OBJECT *FirstArg)
864 {
865 ACPI_STATUS Status = AE_OK;
866 ACPI_PARSE_OBJECT *Arg;
867 ACPI_PARSE_OBJECT *Arguments[ACPI_OBJ_NUM_OPERANDS];
868 UINT32 ArgCount = 0;
869 UINT32 Index = WalkState->NumOperands;
870 UINT32 i;
871
872
873 ACPI_FUNCTION_TRACE_PTR (DsCreateOperands, FirstArg);
874
875
876 /* Get all arguments in the list */
877
878 Arg = FirstArg;
879 while (Arg)
880 {
881 if (Index >= ACPI_OBJ_NUM_OPERANDS)
882 {
883 return_ACPI_STATUS (AE_BAD_DATA);
884 }
885
886 Arguments[Index] = Arg;
887 WalkState->Operands [Index] = NULL;
888
889 /* Move on to next argument, if any */
890
891 Arg = Arg->Common.Next;
892 ArgCount++;
893 Index++;
894 }
895
896 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
897 "NumOperands %d, ArgCount %d, Index %d\n",
898 WalkState->NumOperands, ArgCount, Index));
899
900 /* Create the interpreter arguments, in reverse order */
901
902 Index--;
903 for (i = 0; i < ArgCount; i++)
904 {
905 Arg = Arguments[Index];
906 WalkState->OperandIndex = (UINT8) Index;
907
908 Status = AcpiDsCreateOperand (WalkState, Arg, Index);
909 if (ACPI_FAILURE (Status))
910 {
911 goto Cleanup;
912 }
913
914 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
915 "Created Arg #%u (%p) %u args total\n",
916 Index, Arg, ArgCount));
917 Index--;
918 }
919
920 return_ACPI_STATUS (Status);
921
922
923 Cleanup:
924 /*
925 * We must undo everything done above; meaning that we must
926 * pop everything off of the operand stack and delete those
927 * objects
928 */
929 AcpiDsObjStackPopAndDelete (ArgCount, WalkState);
930
931 ACPI_EXCEPTION ((AE_INFO, Status, "While creating Arg %u", Index));
932 return_ACPI_STATUS (Status);
933 }
934
935
936 /*****************************************************************************
937 *
938 * FUNCTION: AcpiDsEvaluateNamePath
939 *
940 * PARAMETERS: WalkState - Current state of the parse tree walk,
941 * the opcode of current operation should be
942 * AML_INT_NAMEPATH_OP
943 *
944 * RETURN: Status
945 *
946 * DESCRIPTION: Translate the -NamePath- parse tree object to the equivalent
947 * interpreter object, convert it to value, if needed, duplicate
948 * it, if needed, and push it onto the current result stack.
949 *
950 ****************************************************************************/
951
952 ACPI_STATUS
AcpiDsEvaluateNamePath(ACPI_WALK_STATE * WalkState)953 AcpiDsEvaluateNamePath (
954 ACPI_WALK_STATE *WalkState)
955 {
956 ACPI_STATUS Status = AE_OK;
957 ACPI_PARSE_OBJECT *Op = WalkState->Op;
958 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
959 ACPI_OPERAND_OBJECT *NewObjDesc;
960 UINT8 Type;
961
962
963 ACPI_FUNCTION_TRACE_PTR (DsEvaluateNamePath, WalkState);
964
965
966 if (!Op->Common.Parent)
967 {
968 /* This happens after certain exception processing */
969
970 goto Exit;
971 }
972
973 if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
974 (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP) ||
975 (Op->Common.Parent->Common.AmlOpcode == AML_REF_OF_OP))
976 {
977 /* TBD: Should we specify this feature as a bit of OpInfo->Flags of these opcodes? */
978
979 goto Exit;
980 }
981
982 Status = AcpiDsCreateOperand (WalkState, Op, 0);
983 if (ACPI_FAILURE (Status))
984 {
985 goto Exit;
986 }
987
988 if (Op->Common.Flags & ACPI_PARSEOP_TARGET)
989 {
990 NewObjDesc = *Operand;
991 goto PushResult;
992 }
993
994 Type = (*Operand)->Common.Type;
995
996 Status = AcpiExResolveToValue (Operand, WalkState);
997 if (ACPI_FAILURE (Status))
998 {
999 goto Exit;
1000 }
1001
1002 if (Type == ACPI_TYPE_INTEGER)
1003 {
1004 /* It was incremented by AcpiExResolveToValue */
1005
1006 AcpiUtRemoveReference (*Operand);
1007
1008 Status = AcpiUtCopyIobjectToIobject (
1009 *Operand, &NewObjDesc, WalkState);
1010 if (ACPI_FAILURE (Status))
1011 {
1012 goto Exit;
1013 }
1014 }
1015 else
1016 {
1017 /*
1018 * The object either was anew created or is
1019 * a Namespace node - don't decrement it.
1020 */
1021 NewObjDesc = *Operand;
1022 }
1023
1024 /* Cleanup for name-path operand */
1025
1026 Status = AcpiDsObjStackPop (1, WalkState);
1027 if (ACPI_FAILURE (Status))
1028 {
1029 WalkState->ResultObj = NewObjDesc;
1030 goto Exit;
1031 }
1032
1033 PushResult:
1034
1035 WalkState->ResultObj = NewObjDesc;
1036
1037 Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
1038 if (ACPI_SUCCESS (Status))
1039 {
1040 /* Force to take it from stack */
1041
1042 Op->Common.Flags |= ACPI_PARSEOP_IN_STACK;
1043 }
1044
1045 Exit:
1046
1047 return_ACPI_STATUS (Status);
1048 }
1049
