1 /******************************************************************************
3 * Module Name: psloop - Main AML parse loop
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2016, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
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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 switch (Op->Common.AmlOpcode)
109 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
110 case AML_WORD_OP: /* AML_WORDDATA_ARG */
111 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
112 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
113 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
115 /* Fill in constant or string argument directly */
117 AcpiPsGetNextSimpleArg (&(WalkState->ParserState),
118 GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), Op);
121 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
123 Status = AcpiPsGetNextNamepath (WalkState,
124 &(WalkState->ParserState), Op, ACPI_POSSIBLE_METHOD_CALL);
125 if (ACPI_FAILURE (Status))
127 return_ACPI_STATUS (Status);
130 WalkState->ArgTypes = 0;
135 * Op is not a constant or string, append each argument to the Op
137 while (GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) &&
138 !WalkState->ArgCount)
140 WalkState->Aml = WalkState->ParserState.Aml;
142 Status = AcpiPsGetNextArg (WalkState, &(WalkState->ParserState),
143 GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), &Arg);
144 if (ACPI_FAILURE (Status))
146 return_ACPI_STATUS (Status);
151 AcpiPsAppendArg (Op, Arg);
154 INCREMENT_ARG_LIST (WalkState->ArgTypes);
159 * Handle executable code at "module-level". This refers to
160 * executable opcodes that appear outside of any control method.
162 if ((WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2) &&
163 ((WalkState->ParseFlags & ACPI_PARSE_DISASSEMBLE) == 0))
166 * We want to skip If/Else/While constructs during Pass1 because we
167 * want to actually conditionally execute the code during Pass2.
169 * Except for disassembly, where we always want to walk the
170 * If/Else/While packages
172 switch (Op->Common.AmlOpcode)
178 * Currently supported module-level opcodes are:
179 * IF/ELSE/WHILE. These appear to be the most common,
180 * and easiest to support since they open an AML
183 if (WalkState->PassNumber == ACPI_IMODE_LOAD_PASS1)
185 AcpiPsLinkModuleCode (Op->Common.Parent, AmlOpStart,
186 (UINT32) (WalkState->ParserState.PkgEnd - AmlOpStart),
190 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
191 "Pass1: Skipping an If/Else/While body\n"));
193 /* Skip body of if/else/while in pass 1 */
195 WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
196 WalkState->ArgCount = 0;
201 * Check for an unsupported executable opcode at module
202 * level. We must be in PASS1, the parent must be a SCOPE,
203 * The opcode class must be EXECUTE, and the opcode must
204 * not be an argument to another opcode.
206 if ((WalkState->PassNumber == ACPI_IMODE_LOAD_PASS1) &&
207 (Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP))
209 OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
210 if ((OpInfo->Class == AML_CLASS_EXECUTE) &&
213 ACPI_WARNING ((AE_INFO,
214 "Unsupported module-level executable opcode "
215 "0x%.2X at table offset 0x%.4X",
216 Op->Common.AmlOpcode,
217 (UINT32) (ACPI_PTR_DIFF (AmlOpStart,
218 WalkState->ParserState.AmlStart) +
219 sizeof (ACPI_TABLE_HEADER))));
226 /* Special processing for certain opcodes */
228 switch (Op->Common.AmlOpcode)
232 * Skip parsing of control method because we don't have enough
233 * info in the first pass to parse it correctly.
235 * Save the length and address of the body
237 Op->Named.Data = WalkState->ParserState.Aml;
238 Op->Named.Length = (UINT32)
239 (WalkState->ParserState.PkgEnd - WalkState->ParserState.Aml);
241 /* Skip body of method */
243 WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
244 WalkState->ArgCount = 0;
249 case AML_VAR_PACKAGE_OP:
251 if ((Op->Common.Parent) &&
252 (Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) &&
253 (WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2))
256 * Skip parsing of Buffers and Packages because we don't have
257 * enough info in the first pass to parse them correctly.
259 Op->Named.Data = AmlOpStart;
260 Op->Named.Length = (UINT32)
261 (WalkState->ParserState.PkgEnd - AmlOpStart);
265 WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
266 WalkState->ArgCount = 0;
272 if (WalkState->ControlState)
274 WalkState->ControlState->Control.PackageEnd =
275 WalkState->ParserState.PkgEnd;
281 /* No action for all other opcodes */
289 return_ACPI_STATUS (AE_OK);
293 /*******************************************************************************
295 * FUNCTION: AcpiPsLinkModuleCode
297 * PARAMETERS: ParentOp - Parent parser op
298 * AmlStart - Pointer to the AML
299 * AmlLength - Length of executable AML
300 * OwnerId - OwnerId of module level code
304 * DESCRIPTION: Wrap the module-level code with a method object and link the
305 * object to the global list. Note, the mutex field of the method
306 * object is used to link multiple module-level code objects.
308 ******************************************************************************/
311 AcpiPsLinkModuleCode (
312 ACPI_PARSE_OBJECT *ParentOp,
315 ACPI_OWNER_ID OwnerId)
317 ACPI_OPERAND_OBJECT *Prev;
318 ACPI_OPERAND_OBJECT *Next;
319 ACPI_OPERAND_OBJECT *MethodObj;
320 ACPI_NAMESPACE_NODE *ParentNode;
323 ACPI_FUNCTION_TRACE (PsLinkModuleCode);
326 /* Get the tail of the list */
328 Prev = Next = AcpiGbl_ModuleCodeList;
332 Next = Next->Method.Mutex;
336 * Insert the module level code into the list. Merge it if it is
337 * adjacent to the previous element.
340 ((Prev->Method.AmlStart + Prev->Method.AmlLength) != AmlStart))
342 /* Create, initialize, and link a new temporary method object */
344 MethodObj = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
350 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
351 "Create/Link new code block: %p\n", MethodObj));
353 if (ParentOp->Common.Node)
355 ParentNode = ParentOp->Common.Node;
359 ParentNode = AcpiGbl_RootNode;
362 MethodObj->Method.AmlStart = AmlStart;
363 MethodObj->Method.AmlLength = AmlLength;
364 MethodObj->Method.OwnerId = OwnerId;
365 MethodObj->Method.InfoFlags |= ACPI_METHOD_MODULE_LEVEL;
368 * Save the parent node in NextObject. This is cheating, but we
369 * don't want to expand the method object.
371 MethodObj->Method.NextObject =
372 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParentNode);
376 AcpiGbl_ModuleCodeList = MethodObj;
380 Prev->Method.Mutex = MethodObj;
385 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
386 "Appending to existing code block: %p\n", Prev));
388 Prev->Method.AmlLength += AmlLength;
394 /*******************************************************************************
396 * FUNCTION: AcpiPsParseLoop
398 * PARAMETERS: WalkState - Current state
402 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
405 ******************************************************************************/
409 ACPI_WALK_STATE *WalkState)
411 ACPI_STATUS Status = AE_OK;
412 ACPI_PARSE_OBJECT *Op = NULL; /* current op */
413 ACPI_PARSE_STATE *ParserState;
414 UINT8 *AmlOpStart = NULL;
417 ACPI_FUNCTION_TRACE_PTR (PsParseLoop, WalkState);
420 if (WalkState->DescendingCallback == NULL)
422 return_ACPI_STATUS (AE_BAD_PARAMETER);
425 ParserState = &WalkState->ParserState;
426 WalkState->ArgTypes = 0;
428 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
430 if (WalkState->WalkType & ACPI_WALK_METHOD_RESTART)
432 /* We are restarting a preempted control method */
434 if (AcpiPsHasCompletedScope (ParserState))
437 * We must check if a predicate to an IF or WHILE statement
440 if ((ParserState->Scope->ParseScope.Op) &&
441 ((ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_IF_OP) ||
442 (ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_WHILE_OP)) &&
443 (WalkState->ControlState) &&
444 (WalkState->ControlState->Common.State ==
445 ACPI_CONTROL_PREDICATE_EXECUTING))
448 * A predicate was just completed, get the value of the
449 * predicate and branch based on that value
451 WalkState->Op = NULL;
452 Status = AcpiDsGetPredicateValue (WalkState, ACPI_TO_POINTER (TRUE));
453 if (ACPI_FAILURE (Status) &&
454 ((Status & AE_CODE_MASK) != AE_CODE_CONTROL))
456 if (Status == AE_AML_NO_RETURN_VALUE)
458 ACPI_EXCEPTION ((AE_INFO, Status,
459 "Invoked method did not return a value"));
462 ACPI_EXCEPTION ((AE_INFO, Status, "GetPredicate Failed"));
463 return_ACPI_STATUS (Status);
466 Status = AcpiPsNextParseState (WalkState, Op, Status);
469 AcpiPsPopScope (ParserState, &Op,
470 &WalkState->ArgTypes, &WalkState->ArgCount);
471 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", Op));
473 else if (WalkState->PrevOp)
475 /* We were in the middle of an op */
477 Op = WalkState->PrevOp;
478 WalkState->ArgTypes = WalkState->PrevArgTypes;
483 /* Iterative parsing loop, while there is more AML to process: */
485 while ((ParserState->Aml < ParserState->AmlEnd) || (Op))
487 AmlOpStart = ParserState->Aml;
490 Status = AcpiPsCreateOp (WalkState, AmlOpStart, &Op);
491 if (ACPI_FAILURE (Status))
493 if (Status == AE_CTRL_PARSE_CONTINUE)
498 if (Status == AE_CTRL_PARSE_PENDING)
503 if (Status == AE_CTRL_TERMINATE)
505 return_ACPI_STATUS (Status);
508 Status = AcpiPsCompleteOp (WalkState, &Op, Status);
509 if (ACPI_FAILURE (Status))
511 return_ACPI_STATUS (Status);
517 AcpiExStartTraceOpcode (Op, WalkState);
522 * Start ArgCount at zero because we don't know if there are
525 WalkState->ArgCount = 0;
527 /* Are there any arguments that must be processed? */
529 if (WalkState->ArgTypes)
533 Status = AcpiPsGetArguments (WalkState, AmlOpStart, Op);
534 if (ACPI_FAILURE (Status))
536 Status = AcpiPsCompleteOp (WalkState, &Op, Status);
537 if (ACPI_FAILURE (Status))
539 return_ACPI_STATUS (Status);
546 /* Check for arguments that need to be processed */
548 if (WalkState->ArgCount)
551 * There are arguments (complex ones), push Op and
552 * prepare for argument
554 Status = AcpiPsPushScope (ParserState, Op,
555 WalkState->ArgTypes, WalkState->ArgCount);
556 if (ACPI_FAILURE (Status))
558 Status = AcpiPsCompleteOp (WalkState, &Op, Status);
559 if (ACPI_FAILURE (Status))
561 return_ACPI_STATUS (Status);
572 * All arguments have been processed -- Op is complete,
575 WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
576 if (WalkState->OpInfo->Flags & AML_NAMED)
578 if (Op->Common.AmlOpcode == AML_REGION_OP ||
579 Op->Common.AmlOpcode == AML_DATA_REGION_OP)
582 * Skip parsing of control method or opregion body,
583 * because we don't have enough info in the first pass
584 * to parse them correctly.
586 * Completed parsing an OpRegion declaration, we now
589 Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
593 if (WalkState->OpInfo->Flags & AML_CREATE)
596 * Backup to beginning of CreateXXXfield declaration (1 for
599 * BodyLength is unknown until we parse the body
601 Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
604 if (Op->Common.AmlOpcode == AML_BANK_FIELD_OP)
607 * Backup to beginning of BankField declaration
609 * BodyLength is unknown until we parse the body
611 Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
614 /* This op complete, notify the dispatcher */
616 if (WalkState->AscendingCallback != NULL)
619 WalkState->Opcode = Op->Common.AmlOpcode;
621 Status = WalkState->AscendingCallback (WalkState);
622 Status = AcpiPsNextParseState (WalkState, Op, Status);
623 if (Status == AE_CTRL_PENDING)
629 Status = AcpiPsCompleteOp (WalkState, &Op, Status);
630 if (ACPI_FAILURE (Status))
632 return_ACPI_STATUS (Status);
635 } /* while ParserState->Aml */
637 Status = AcpiPsCompleteFinalOp (WalkState, Op, Status);
638 return_ACPI_STATUS (Status);