1 /******************************************************************************
3 * Module Name: psloop - Main AML parse loop
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2016, Intel Corp.
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12 * modification, are permitted provided that the following conditions
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
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31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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45 * Parse the AML and build an operation tree as most interpreters, (such as
46 * Perl) do. Parsing is done by hand rather than with a YACC generated parser
47 * to tightly constrain stack and dynamic memory usage. Parsing is kept
48 * flexible and the code fairly compact by parsing based on a list of AML
49 * opcode templates in AmlOpInfo[].
59 #define _COMPONENT ACPI_PARSER
60 ACPI_MODULE_NAME ("psloop")
63 /* Local prototypes */
67 ACPI_WALK_STATE *WalkState,
69 ACPI_PARSE_OBJECT *Op);
72 AcpiPsLinkModuleCode (
73 ACPI_PARSE_OBJECT *ParentOp,
76 ACPI_OWNER_ID OwnerId);
79 /*******************************************************************************
81 * FUNCTION: AcpiPsGetArguments
83 * PARAMETERS: WalkState - Current state
84 * AmlOpStart - Op start in AML
89 * DESCRIPTION: Get arguments for passed Op.
91 ******************************************************************************/
95 ACPI_WALK_STATE *WalkState,
97 ACPI_PARSE_OBJECT *Op)
99 ACPI_STATUS Status = AE_OK;
100 ACPI_PARSE_OBJECT *Arg = NULL;
101 const ACPI_OPCODE_INFO *OpInfo;
104 ACPI_FUNCTION_TRACE_PTR (PsGetArguments, WalkState);
107 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
108 "Get arguments for opcode [%s]\n", Op->Common.AmlOpName));
110 switch (Op->Common.AmlOpcode)
112 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
113 case AML_WORD_OP: /* AML_WORDDATA_ARG */
114 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
115 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
116 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
118 /* Fill in constant or string argument directly */
120 AcpiPsGetNextSimpleArg (&(WalkState->ParserState),
121 GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), Op);
124 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
126 Status = AcpiPsGetNextNamepath (WalkState,
127 &(WalkState->ParserState), Op, ACPI_POSSIBLE_METHOD_CALL);
128 if (ACPI_FAILURE (Status))
130 return_ACPI_STATUS (Status);
133 WalkState->ArgTypes = 0;
138 * Op is not a constant or string, append each argument to the Op
140 while (GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) &&
141 !WalkState->ArgCount)
143 WalkState->Aml = WalkState->ParserState.Aml;
145 Status = AcpiPsGetNextArg (WalkState, &(WalkState->ParserState),
146 GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), &Arg);
147 if (ACPI_FAILURE (Status))
149 return_ACPI_STATUS (Status);
154 AcpiPsAppendArg (Op, Arg);
157 INCREMENT_ARG_LIST (WalkState->ArgTypes);
162 * Handle executable code at "module-level". This refers to
163 * executable opcodes that appear outside of any control method.
165 if ((WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2) &&
166 ((WalkState->ParseFlags & ACPI_PARSE_DISASSEMBLE) == 0))
169 * We want to skip If/Else/While constructs during Pass1 because we
170 * want to actually conditionally execute the code during Pass2.
172 * Except for disassembly, where we always want to walk the
173 * If/Else/While packages
175 switch (Op->Common.AmlOpcode)
181 * Currently supported module-level opcodes are:
182 * IF/ELSE/WHILE. These appear to be the most common,
183 * and easiest to support since they open an AML
186 if (WalkState->PassNumber == ACPI_IMODE_LOAD_PASS1)
188 AcpiPsLinkModuleCode (Op->Common.Parent, AmlOpStart,
189 (UINT32) (WalkState->ParserState.PkgEnd - AmlOpStart),
193 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
194 "Pass1: Skipping an If/Else/While body\n"));
196 /* Skip body of if/else/while in pass 1 */
198 WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
199 WalkState->ArgCount = 0;
204 * Check for an unsupported executable opcode at module
205 * level. We must be in PASS1, the parent must be a SCOPE,
206 * The opcode class must be EXECUTE, and the opcode must
207 * not be an argument to another opcode.
209 if ((WalkState->PassNumber == ACPI_IMODE_LOAD_PASS1) &&
210 (Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP))
212 OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
213 if ((OpInfo->Class == AML_CLASS_EXECUTE) &&
216 ACPI_WARNING ((AE_INFO,
217 "Unsupported module-level executable opcode "
218 "0x%.2X at table offset 0x%.4X",
219 Op->Common.AmlOpcode,
220 (UINT32) (ACPI_PTR_DIFF (AmlOpStart,
221 WalkState->ParserState.AmlStart) +
222 sizeof (ACPI_TABLE_HEADER))));
229 /* Special processing for certain opcodes */
231 switch (Op->Common.AmlOpcode)
235 * Skip parsing of control method because we don't have enough
236 * info in the first pass to parse it correctly.
238 * Save the length and address of the body
240 Op->Named.Data = WalkState->ParserState.Aml;
241 Op->Named.Length = (UINT32)
242 (WalkState->ParserState.PkgEnd - WalkState->ParserState.Aml);
244 /* Skip body of method */
246 WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
247 WalkState->ArgCount = 0;
252 case AML_VAR_PACKAGE_OP:
254 if ((Op->Common.Parent) &&
255 (Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) &&
256 (WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2))
259 * Skip parsing of Buffers and Packages because we don't have
260 * enough info in the first pass to parse them correctly.
262 Op->Named.Data = AmlOpStart;
263 Op->Named.Length = (UINT32)
264 (WalkState->ParserState.PkgEnd - AmlOpStart);
268 WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
269 WalkState->ArgCount = 0;
275 if (WalkState->ControlState)
277 WalkState->ControlState->Control.PackageEnd =
278 WalkState->ParserState.PkgEnd;
284 /* No action for all other opcodes */
292 return_ACPI_STATUS (AE_OK);
296 /*******************************************************************************
298 * FUNCTION: AcpiPsLinkModuleCode
300 * PARAMETERS: ParentOp - Parent parser op
301 * AmlStart - Pointer to the AML
302 * AmlLength - Length of executable AML
303 * OwnerId - OwnerId of module level code
307 * DESCRIPTION: Wrap the module-level code with a method object and link the
308 * object to the global list. Note, the mutex field of the method
309 * object is used to link multiple module-level code objects.
311 ******************************************************************************/
314 AcpiPsLinkModuleCode (
315 ACPI_PARSE_OBJECT *ParentOp,
318 ACPI_OWNER_ID OwnerId)
320 ACPI_OPERAND_OBJECT *Prev;
321 ACPI_OPERAND_OBJECT *Next;
322 ACPI_OPERAND_OBJECT *MethodObj;
323 ACPI_NAMESPACE_NODE *ParentNode;
326 ACPI_FUNCTION_TRACE (PsLinkModuleCode);
329 /* Get the tail of the list */
331 Prev = Next = AcpiGbl_ModuleCodeList;
335 Next = Next->Method.Mutex;
339 * Insert the module level code into the list. Merge it if it is
340 * adjacent to the previous element.
343 ((Prev->Method.AmlStart + Prev->Method.AmlLength) != AmlStart))
345 /* Create, initialize, and link a new temporary method object */
347 MethodObj = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
353 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
354 "Create/Link new code block: %p\n", MethodObj));
356 if (ParentOp->Common.Node)
358 ParentNode = ParentOp->Common.Node;
362 ParentNode = AcpiGbl_RootNode;
365 MethodObj->Method.AmlStart = AmlStart;
366 MethodObj->Method.AmlLength = AmlLength;
367 MethodObj->Method.OwnerId = OwnerId;
368 MethodObj->Method.InfoFlags |= ACPI_METHOD_MODULE_LEVEL;
371 * Save the parent node in NextObject. This is cheating, but we
372 * don't want to expand the method object.
374 MethodObj->Method.NextObject =
375 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParentNode);
379 AcpiGbl_ModuleCodeList = MethodObj;
383 Prev->Method.Mutex = MethodObj;
388 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
389 "Appending to existing code block: %p\n", Prev));
391 Prev->Method.AmlLength += AmlLength;
397 /*******************************************************************************
399 * FUNCTION: AcpiPsParseLoop
401 * PARAMETERS: WalkState - Current state
405 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
408 ******************************************************************************/
412 ACPI_WALK_STATE *WalkState)
414 ACPI_STATUS Status = AE_OK;
415 ACPI_PARSE_OBJECT *Op = NULL; /* current op */
416 ACPI_PARSE_STATE *ParserState;
417 UINT8 *AmlOpStart = NULL;
420 ACPI_FUNCTION_TRACE_PTR (PsParseLoop, WalkState);
423 if (WalkState->DescendingCallback == NULL)
425 return_ACPI_STATUS (AE_BAD_PARAMETER);
428 ParserState = &WalkState->ParserState;
429 WalkState->ArgTypes = 0;
431 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
433 if (WalkState->WalkType & ACPI_WALK_METHOD_RESTART)
435 /* We are restarting a preempted control method */
437 if (AcpiPsHasCompletedScope (ParserState))
440 * We must check if a predicate to an IF or WHILE statement
443 if ((ParserState->Scope->ParseScope.Op) &&
444 ((ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_IF_OP) ||
445 (ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_WHILE_OP)) &&
446 (WalkState->ControlState) &&
447 (WalkState->ControlState->Common.State ==
448 ACPI_CONTROL_PREDICATE_EXECUTING))
451 * A predicate was just completed, get the value of the
452 * predicate and branch based on that value
454 WalkState->Op = NULL;
455 Status = AcpiDsGetPredicateValue (WalkState, ACPI_TO_POINTER (TRUE));
456 if (ACPI_FAILURE (Status) &&
457 ((Status & AE_CODE_MASK) != AE_CODE_CONTROL))
459 if (Status == AE_AML_NO_RETURN_VALUE)
461 ACPI_EXCEPTION ((AE_INFO, Status,
462 "Invoked method did not return a value"));
465 ACPI_EXCEPTION ((AE_INFO, Status, "GetPredicate Failed"));
466 return_ACPI_STATUS (Status);
469 Status = AcpiPsNextParseState (WalkState, Op, Status);
472 AcpiPsPopScope (ParserState, &Op,
473 &WalkState->ArgTypes, &WalkState->ArgCount);
474 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", Op));
476 else if (WalkState->PrevOp)
478 /* We were in the middle of an op */
480 Op = WalkState->PrevOp;
481 WalkState->ArgTypes = WalkState->PrevArgTypes;
486 /* Iterative parsing loop, while there is more AML to process: */
488 while ((ParserState->Aml < ParserState->AmlEnd) || (Op))
490 AmlOpStart = ParserState->Aml;
493 Status = AcpiPsCreateOp (WalkState, AmlOpStart, &Op);
494 if (ACPI_FAILURE (Status))
496 if (Status == AE_CTRL_PARSE_CONTINUE)
501 if (Status == AE_CTRL_PARSE_PENDING)
506 if (Status == AE_CTRL_TERMINATE)
508 return_ACPI_STATUS (Status);
511 Status = AcpiPsCompleteOp (WalkState, &Op, Status);
512 if (ACPI_FAILURE (Status))
514 return_ACPI_STATUS (Status);
520 AcpiExStartTraceOpcode (Op, WalkState);
525 * Start ArgCount at zero because we don't know if there are
528 WalkState->ArgCount = 0;
530 /* Are there any arguments that must be processed? */
532 if (WalkState->ArgTypes)
536 Status = AcpiPsGetArguments (WalkState, AmlOpStart, Op);
537 if (ACPI_FAILURE (Status))
539 Status = AcpiPsCompleteOp (WalkState, &Op, Status);
540 if (ACPI_FAILURE (Status))
542 return_ACPI_STATUS (Status);
549 /* Check for arguments that need to be processed */
551 if (WalkState->ArgCount)
554 * There are arguments (complex ones), push Op and
555 * prepare for argument
557 Status = AcpiPsPushScope (ParserState, Op,
558 WalkState->ArgTypes, WalkState->ArgCount);
559 if (ACPI_FAILURE (Status))
561 Status = AcpiPsCompleteOp (WalkState, &Op, Status);
562 if (ACPI_FAILURE (Status))
564 return_ACPI_STATUS (Status);
575 * All arguments have been processed -- Op is complete,
578 WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
579 if (WalkState->OpInfo->Flags & AML_NAMED)
581 if (Op->Common.AmlOpcode == AML_REGION_OP ||
582 Op->Common.AmlOpcode == AML_DATA_REGION_OP)
585 * Skip parsing of control method or opregion body,
586 * because we don't have enough info in the first pass
587 * to parse them correctly.
589 * Completed parsing an OpRegion declaration, we now
592 Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
596 if (WalkState->OpInfo->Flags & AML_CREATE)
599 * Backup to beginning of CreateXXXfield declaration (1 for
602 * BodyLength is unknown until we parse the body
604 Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
607 if (Op->Common.AmlOpcode == AML_BANK_FIELD_OP)
610 * Backup to beginning of BankField declaration
612 * BodyLength is unknown until we parse the body
614 Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
617 /* This op complete, notify the dispatcher */
619 if (WalkState->AscendingCallback != NULL)
622 WalkState->Opcode = Op->Common.AmlOpcode;
624 Status = WalkState->AscendingCallback (WalkState);
625 Status = AcpiPsNextParseState (WalkState, Op, Status);
626 if (Status == AE_CTRL_PENDING)
632 Status = AcpiPsCompleteOp (WalkState, &Op, Status);
633 if (ACPI_FAILURE (Status))
635 return_ACPI_STATUS (Status);
638 } /* while ParserState->Aml */
640 Status = AcpiPsCompleteFinalOp (WalkState, Op, Status);
641 return_ACPI_STATUS (Status);