| /****************************************************************************** |
| * |
| * Module Name: psloop - Main AML parse loop |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2020, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| /* |
| * Parse the AML and build an operation tree as most interpreters, (such as |
| * Perl) do. Parsing is done by hand rather than with a YACC generated parser |
| * to tightly constrain stack and dynamic memory usage. Parsing is kept |
| * flexible and the code fairly compact by parsing based on a list of AML |
| * opcode templates in AmlOpInfo[]. |
| */ |
| |
| #include "acpi.h" |
| #include "accommon.h" |
| #include "acinterp.h" |
| #include "acparser.h" |
| #include "acdispat.h" |
| #include "amlcode.h" |
| #include "acconvert.h" |
| #include "acnamesp.h" |
| |
| #define _COMPONENT ACPI_PARSER |
| ACPI_MODULE_NAME ("psloop") |
| |
| |
| /* Local prototypes */ |
| |
| static ACPI_STATUS |
| AcpiPsGetArguments ( |
| ACPI_WALK_STATE *WalkState, |
| UINT8 *AmlOpStart, |
| ACPI_PARSE_OBJECT *Op); |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiPsGetArguments |
| * |
| * PARAMETERS: WalkState - Current state |
| * AmlOpStart - Op start in AML |
| * Op - Current Op |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Get arguments for passed Op. |
| * |
| ******************************************************************************/ |
| |
| static ACPI_STATUS |
| AcpiPsGetArguments ( |
| ACPI_WALK_STATE *WalkState, |
| UINT8 *AmlOpStart, |
| ACPI_PARSE_OBJECT *Op) |
| { |
| ACPI_STATUS Status = AE_OK; |
| ACPI_PARSE_OBJECT *Arg = NULL; |
| |
| |
| ACPI_FUNCTION_TRACE_PTR (PsGetArguments, WalkState); |
| |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, |
| "Get arguments for opcode [%s]\n", Op->Common.AmlOpName)); |
| |
| switch (Op->Common.AmlOpcode) |
| { |
| case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ |
| case AML_WORD_OP: /* AML_WORDDATA_ARG */ |
| case AML_DWORD_OP: /* AML_DWORDATA_ARG */ |
| case AML_QWORD_OP: /* AML_QWORDATA_ARG */ |
| case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ |
| |
| /* Fill in constant or string argument directly */ |
| |
| AcpiPsGetNextSimpleArg (&(WalkState->ParserState), |
| GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), Op); |
| break; |
| |
| case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ |
| |
| Status = AcpiPsGetNextNamepath (WalkState, |
| &(WalkState->ParserState), Op, ACPI_POSSIBLE_METHOD_CALL); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| WalkState->ArgTypes = 0; |
| break; |
| |
| default: |
| /* |
| * Op is not a constant or string, append each argument to the Op |
| */ |
| while (GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) && |
| !WalkState->ArgCount) |
| { |
| WalkState->Aml = WalkState->ParserState.Aml; |
| |
| switch (Op->Common.AmlOpcode) |
| { |
| case AML_METHOD_OP: |
| case AML_BUFFER_OP: |
| case AML_PACKAGE_OP: |
| case AML_VARIABLE_PACKAGE_OP: |
| case AML_WHILE_OP: |
| |
| break; |
| |
| default: |
| |
| ASL_CV_CAPTURE_COMMENTS (WalkState); |
| break; |
| } |
| |
| Status = AcpiPsGetNextArg (WalkState, &(WalkState->ParserState), |
| GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), &Arg); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| if (Arg) |
| { |
| AcpiPsAppendArg (Op, Arg); |
| } |
| |
| INCREMENT_ARG_LIST (WalkState->ArgTypes); |
| } |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, |
| "Final argument count: %8.8X pass %u\n", |
| WalkState->ArgCount, WalkState->PassNumber)); |
| |
| /* Special processing for certain opcodes */ |
| |
| switch (Op->Common.AmlOpcode) |
| { |
| case AML_METHOD_OP: |
| /* |
| * Skip parsing of control method because we don't have enough |
| * info in the first pass to parse it correctly. |
| * |
| * Save the length and address of the body |
| */ |
| Op->Named.Data = WalkState->ParserState.Aml; |
| Op->Named.Length = (UINT32) |
| (WalkState->ParserState.PkgEnd - WalkState->ParserState.Aml); |
| |
| /* Skip body of method */ |
| |
| WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd; |
| WalkState->ArgCount = 0; |
| break; |
| |
| case AML_BUFFER_OP: |
| case AML_PACKAGE_OP: |
| case AML_VARIABLE_PACKAGE_OP: |
| |
| if ((Op->Common.Parent) && |
| (Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) && |
| (WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2)) |
| { |
| ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, |
| "Setup Package/Buffer: Pass %u, AML Ptr: %p\n", |
| WalkState->PassNumber, AmlOpStart)); |
| |
| /* |
| * Skip parsing of Buffers and Packages because we don't have |
| * enough info in the first pass to parse them correctly. |
| */ |
| Op->Named.Data = AmlOpStart; |
| Op->Named.Length = (UINT32) |
| (WalkState->ParserState.PkgEnd - AmlOpStart); |
| |
| /* Skip body */ |
| |
| WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd; |
| WalkState->ArgCount = 0; |
| } |
| break; |
| |
| case AML_WHILE_OP: |
| |
| if (WalkState->ControlState) |
| { |
| WalkState->ControlState->Control.PackageEnd = |
| WalkState->ParserState.PkgEnd; |
| } |
| break; |
| |
| default: |
| |
| /* No action for all other opcodes */ |
| |
| break; |
| } |
| |
| break; |
| } |
| |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiPsParseLoop |
| * |
| * PARAMETERS: WalkState - Current state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Parse AML (pointed to by the current parser state) and return |
| * a tree of ops. |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiPsParseLoop ( |
| ACPI_WALK_STATE *WalkState) |
| { |
| ACPI_STATUS Status = AE_OK; |
| ACPI_PARSE_OBJECT *Op = NULL; /* current op */ |
| ACPI_PARSE_STATE *ParserState; |
| UINT8 *AmlOpStart = NULL; |
| UINT8 OpcodeLength; |
| |
| |
| ACPI_FUNCTION_TRACE_PTR (PsParseLoop, WalkState); |
| |
| |
| if (WalkState->DescendingCallback == NULL) |
| { |
| return_ACPI_STATUS (AE_BAD_PARAMETER); |
| } |
| |
| ParserState = &WalkState->ParserState; |
| WalkState->ArgTypes = 0; |
| |
| #ifndef ACPI_CONSTANT_EVAL_ONLY |
| |
| if (WalkState->WalkType & ACPI_WALK_METHOD_RESTART) |
| { |
| /* We are restarting a preempted control method */ |
| |
| if (AcpiPsHasCompletedScope (ParserState)) |
| { |
| /* |
| * We must check if a predicate to an IF or WHILE statement |
| * was just completed |
| */ |
| if ((ParserState->Scope->ParseScope.Op) && |
| ((ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_IF_OP) || |
| (ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_WHILE_OP)) && |
| (WalkState->ControlState) && |
| (WalkState->ControlState->Common.State == |
| ACPI_CONTROL_PREDICATE_EXECUTING)) |
| { |
| /* |
| * A predicate was just completed, get the value of the |
| * predicate and branch based on that value |
| */ |
| WalkState->Op = NULL; |
| Status = AcpiDsGetPredicateValue (WalkState, ACPI_TO_POINTER (TRUE)); |
| if (ACPI_FAILURE (Status) && |
| ((Status & AE_CODE_MASK) != AE_CODE_CONTROL)) |
| { |
| if (Status == AE_AML_NO_RETURN_VALUE) |
| { |
| ACPI_EXCEPTION ((AE_INFO, Status, |
| "Invoked method did not return a value")); |
| } |
| |
| ACPI_EXCEPTION ((AE_INFO, Status, "GetPredicate Failed")); |
| return_ACPI_STATUS (Status); |
| } |
| |
| Status = AcpiPsNextParseState (WalkState, Op, Status); |
| } |
| |
| AcpiPsPopScope (ParserState, &Op, |
| &WalkState->ArgTypes, &WalkState->ArgCount); |
| ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", Op)); |
| } |
| else if (WalkState->PrevOp) |
| { |
| /* We were in the middle of an op */ |
| |
| Op = WalkState->PrevOp; |
| WalkState->ArgTypes = WalkState->PrevArgTypes; |
| } |
| } |
| #endif |
| |
| /* Iterative parsing loop, while there is more AML to process: */ |
| |
| while ((ParserState->Aml < ParserState->AmlEnd) || (Op)) |
| { |
| ASL_CV_CAPTURE_COMMENTS (WalkState); |
| |
| AmlOpStart = ParserState->Aml; |
| if (!Op) |
| { |
| Status = AcpiPsCreateOp (WalkState, AmlOpStart, &Op); |
| if (ACPI_FAILURE (Status)) |
| { |
| /* |
| * ACPI_PARSE_MODULE_LEVEL means that we are loading a table by |
| * executing it as a control method. However, if we encounter |
| * an error while loading the table, we need to keep trying to |
| * load the table rather than aborting the table load. Set the |
| * status to AE_OK to proceed with the table load. |
| */ |
| if ((WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL) && |
| ((Status == AE_ALREADY_EXISTS) || (Status == AE_NOT_FOUND))) |
| { |
| Status = AE_OK; |
| } |
| if (Status == AE_CTRL_PARSE_CONTINUE) |
| { |
| continue; |
| } |
| |
| if (Status == AE_CTRL_PARSE_PENDING) |
| { |
| Status = AE_OK; |
| } |
| |
| if (Status == AE_CTRL_TERMINATE) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| Status = AcpiPsCompleteOp (WalkState, &Op, Status); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| if (AcpiNsOpensScope ( |
| AcpiPsGetOpcodeInfo (WalkState->Opcode)->ObjectType)) |
| { |
| /* |
| * If the scope/device op fails to parse, skip the body of |
| * the scope op because the parse failure indicates that |
| * the device may not exist. |
| */ |
| ACPI_INFO (("Skipping parse of AML opcode: %s (0x%4.4X)", |
| AcpiPsGetOpcodeName (WalkState->Opcode), WalkState->Opcode)); |
| |
| /* |
| * Determine the opcode length before skipping the opcode. |
| * An opcode can be 1 byte or 2 bytes in length. |
| */ |
| OpcodeLength = 1; |
| if ((WalkState->Opcode & 0xFF00) == AML_EXTENDED_OPCODE) |
| { |
| OpcodeLength = 2; |
| } |
| WalkState->ParserState.Aml = WalkState->Aml + OpcodeLength; |
| |
| WalkState->ParserState.Aml = |
| AcpiPsGetNextPackageEnd(&WalkState->ParserState); |
| WalkState->Aml = WalkState->ParserState.Aml; |
| } |
| |
| continue; |
| } |
| |
| AcpiExStartTraceOpcode (Op, WalkState); |
| } |
| |
| /* |
| * Start ArgCount at zero because we don't know if there are |
| * any args yet |
| */ |
| WalkState->ArgCount = 0; |
| |
| switch (Op->Common.AmlOpcode) |
| { |
| case AML_BYTE_OP: |
| case AML_WORD_OP: |
| case AML_DWORD_OP: |
| case AML_QWORD_OP: |
| |
| break; |
| |
| default: |
| |
| ASL_CV_CAPTURE_COMMENTS (WalkState); |
| break; |
| } |
| |
| /* Are there any arguments that must be processed? */ |
| |
| if (WalkState->ArgTypes) |
| { |
| /* Get arguments */ |
| |
| Status = AcpiPsGetArguments (WalkState, AmlOpStart, Op); |
| if (ACPI_FAILURE (Status)) |
| { |
| Status = AcpiPsCompleteOp (WalkState, &Op, Status); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| if ((WalkState->ControlState) && |
| ((WalkState->ControlState->Control.Opcode == AML_IF_OP) || |
| (WalkState->ControlState->Control.Opcode == AML_WHILE_OP))) |
| { |
| /* |
| * If the if/while op fails to parse, we will skip parsing |
| * the body of the op. |
| */ |
| ParserState->Aml = |
| WalkState->ControlState->Control.AmlPredicateStart + 1; |
| ParserState->Aml = |
| AcpiPsGetNextPackageEnd (ParserState); |
| WalkState->Aml = ParserState->Aml; |
| |
| ACPI_ERROR ((AE_INFO, "Skipping While/If block")); |
| if (*WalkState->Aml == AML_ELSE_OP) |
| { |
| ACPI_ERROR ((AE_INFO, "Skipping Else block")); |
| WalkState->ParserState.Aml = WalkState->Aml + 1; |
| WalkState->ParserState.Aml = |
| AcpiPsGetNextPackageEnd (ParserState); |
| WalkState->Aml = ParserState->Aml; |
| } |
| ACPI_FREE(AcpiUtPopGenericState (&WalkState->ControlState)); |
| } |
| Op = NULL; |
| continue; |
| } |
| } |
| |
| /* Check for arguments that need to be processed */ |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, |
| "Parseloop: argument count: %8.8X\n", WalkState->ArgCount)); |
| |
| if (WalkState->ArgCount) |
| { |
| /* |
| * There are arguments (complex ones), push Op and |
| * prepare for argument |
| */ |
| Status = AcpiPsPushScope (ParserState, Op, |
| WalkState->ArgTypes, WalkState->ArgCount); |
| if (ACPI_FAILURE (Status)) |
| { |
| Status = AcpiPsCompleteOp (WalkState, &Op, Status); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| continue; |
| } |
| |
| Op = NULL; |
| continue; |
| } |
| |
| /* |
| * All arguments have been processed -- Op is complete, |
| * prepare for next |
| */ |
| WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode); |
| if (WalkState->OpInfo->Flags & AML_NAMED) |
| { |
| if (Op->Common.AmlOpcode == AML_REGION_OP || |
| Op->Common.AmlOpcode == AML_DATA_REGION_OP) |
| { |
| /* |
| * Skip parsing of control method or opregion body, |
| * because we don't have enough info in the first pass |
| * to parse them correctly. |
| * |
| * Completed parsing an OpRegion declaration, we now |
| * know the length. |
| */ |
| Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data); |
| } |
| } |
| |
| if (WalkState->OpInfo->Flags & AML_CREATE) |
| { |
| /* |
| * Backup to beginning of CreateXXXfield declaration (1 for |
| * Opcode) |
| * |
| * BodyLength is unknown until we parse the body |
| */ |
| Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data); |
| } |
| |
| if (Op->Common.AmlOpcode == AML_BANK_FIELD_OP) |
| { |
| /* |
| * Backup to beginning of BankField declaration |
| * |
| * BodyLength is unknown until we parse the body |
| */ |
| Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data); |
| } |
| |
| /* This op complete, notify the dispatcher */ |
| |
| if (WalkState->AscendingCallback != NULL) |
| { |
| WalkState->Op = Op; |
| WalkState->Opcode = Op->Common.AmlOpcode; |
| |
| Status = WalkState->AscendingCallback (WalkState); |
| Status = AcpiPsNextParseState (WalkState, Op, Status); |
| if (Status == AE_CTRL_PENDING) |
| { |
| Status = AE_OK; |
| } |
| else if ((WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL) && |
| (ACPI_AML_EXCEPTION(Status) || Status == AE_ALREADY_EXISTS || |
| Status == AE_NOT_FOUND)) |
| { |
| /* |
| * ACPI_PARSE_MODULE_LEVEL flag means that we are currently |
| * loading a table by executing it as a control method. |
| * However, if we encounter an error while loading the table, |
| * we need to keep trying to load the table rather than |
| * aborting the table load (setting the status to AE_OK |
| * continues the table load). If we get a failure at this |
| * point, it means that the dispatcher got an error while |
| * trying to execute the Op. |
| */ |
| Status = AE_OK; |
| } |
| } |
| |
| Status = AcpiPsCompleteOp (WalkState, &Op, Status); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| } /* while ParserState->Aml */ |
| |
| Status = AcpiPsCompleteFinalOp (WalkState, Op, Status); |
| return_ACPI_STATUS (Status); |
| } |
