702 lines
21 KiB
C
702 lines
21 KiB
C
/******************************************************************************
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*
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* Module Name: psparse - Parser top level AML parse routines
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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/*
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* Parse the AML and build an operation tree as most interpreters,
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* like Perl, do. Parsing is done by hand rather than with a YACC
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* generated parser to tightly constrain stack and dynamic memory
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* usage. At the same time, parsing is kept flexible and the code
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* fairly compact by parsing based on a list of AML opcode
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* templates in AmlOpInfo[]
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "acparser.h"
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#include "acdispat.h"
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#include "amlcode.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME ("psparse")
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsGetOpcodeSize
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*
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* PARAMETERS: Opcode - An AML opcode
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*
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* RETURN: Size of the opcode, in bytes (1 or 2)
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*
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* DESCRIPTION: Get the size of the current opcode.
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*
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******************************************************************************/
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UINT32
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AcpiPsGetOpcodeSize (
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UINT32 Opcode)
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{
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/* Extended (2-byte) opcode if > 255 */
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if (Opcode > 0x00FF)
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{
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return (2);
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}
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/* Otherwise, just a single byte opcode */
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return (1);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsPeekOpcode
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*
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* PARAMETERS: ParserState - A parser state object
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*
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* RETURN: Next AML opcode
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*
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* DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
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*
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******************************************************************************/
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UINT16
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AcpiPsPeekOpcode (
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ACPI_PARSE_STATE *ParserState)
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{
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UINT8 *Aml;
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UINT16 Opcode;
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Aml = ParserState->Aml;
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Opcode = (UINT16) ACPI_GET8 (Aml);
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if (Opcode == AML_EXTENDED_OP_PREFIX)
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{
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/* Extended opcode, get the second opcode byte */
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Aml++;
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Opcode = (UINT16) ((Opcode << 8) | ACPI_GET8 (Aml));
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}
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return (Opcode);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsCompleteThisOp
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*
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* PARAMETERS: WalkState - Current State
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* Op - Op to complete
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*
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* RETURN: Status
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*
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* DESCRIPTION: Perform any cleanup at the completion of an Op.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsCompleteThisOp (
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ACPI_WALK_STATE *WalkState,
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ACPI_PARSE_OBJECT *Op)
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{
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ACPI_PARSE_OBJECT *Prev;
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ACPI_PARSE_OBJECT *Next;
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const ACPI_OPCODE_INFO *ParentInfo;
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ACPI_PARSE_OBJECT *ReplacementOp = NULL;
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ACPI_STATUS Status = AE_OK;
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ACPI_FUNCTION_TRACE_PTR (PsCompleteThisOp, Op);
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/* Check for null Op, can happen if AML code is corrupt */
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if (!Op)
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{
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return_ACPI_STATUS (AE_OK); /* OK for now */
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}
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/* Delete this op and the subtree below it if asked to */
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if (((WalkState->ParseFlags & ACPI_PARSE_TREE_MASK) != ACPI_PARSE_DELETE_TREE) ||
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(WalkState->OpInfo->Class == AML_CLASS_ARGUMENT))
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{
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return_ACPI_STATUS (AE_OK);
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}
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/* Make sure that we only delete this subtree */
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if (Op->Common.Parent)
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{
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Prev = Op->Common.Parent->Common.Value.Arg;
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if (!Prev)
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{
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/* Nothing more to do */
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goto Cleanup;
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}
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/*
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* Check if we need to replace the operator and its subtree
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* with a return value op (placeholder op)
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*/
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ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode);
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switch (ParentInfo->Class)
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{
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case AML_CLASS_CONTROL:
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break;
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case AML_CLASS_CREATE:
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/*
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* These opcodes contain TermArg operands. The current
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* op must be replaced by a placeholder return op
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*/
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ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
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if (!ReplacementOp)
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{
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Status = AE_NO_MEMORY;
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}
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break;
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case AML_CLASS_NAMED_OBJECT:
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/*
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* These opcodes contain TermArg operands. The current
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* op must be replaced by a placeholder return op
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*/
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if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP))
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{
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ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
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if (!ReplacementOp)
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{
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Status = AE_NO_MEMORY;
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}
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}
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else if ((Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) &&
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(WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2))
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{
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if ((Op->Common.AmlOpcode == AML_BUFFER_OP) ||
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(Op->Common.AmlOpcode == AML_PACKAGE_OP) ||
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(Op->Common.AmlOpcode == AML_VAR_PACKAGE_OP))
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{
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ReplacementOp = AcpiPsAllocOp (Op->Common.AmlOpcode);
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if (!ReplacementOp)
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{
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Status = AE_NO_MEMORY;
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}
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else
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{
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ReplacementOp->Named.Data = Op->Named.Data;
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ReplacementOp->Named.Length = Op->Named.Length;
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}
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}
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}
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break;
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default:
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ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
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if (!ReplacementOp)
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{
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Status = AE_NO_MEMORY;
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}
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}
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/* We must unlink this op from the parent tree */
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if (Prev == Op)
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{
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/* This op is the first in the list */
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if (ReplacementOp)
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{
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ReplacementOp->Common.Parent = Op->Common.Parent;
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ReplacementOp->Common.Value.Arg = NULL;
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ReplacementOp->Common.Node = Op->Common.Node;
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Op->Common.Parent->Common.Value.Arg = ReplacementOp;
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ReplacementOp->Common.Next = Op->Common.Next;
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}
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else
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{
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Op->Common.Parent->Common.Value.Arg = Op->Common.Next;
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}
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}
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/* Search the parent list */
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else while (Prev)
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{
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/* Traverse all siblings in the parent's argument list */
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Next = Prev->Common.Next;
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if (Next == Op)
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{
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if (ReplacementOp)
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{
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ReplacementOp->Common.Parent = Op->Common.Parent;
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ReplacementOp->Common.Value.Arg = NULL;
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ReplacementOp->Common.Node = Op->Common.Node;
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Prev->Common.Next = ReplacementOp;
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ReplacementOp->Common.Next = Op->Common.Next;
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Next = NULL;
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}
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else
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{
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Prev->Common.Next = Op->Common.Next;
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Next = NULL;
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}
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}
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Prev = Next;
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}
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}
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Cleanup:
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/* Now we can actually delete the subtree rooted at Op */
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AcpiPsDeleteParseTree (Op);
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsNextParseState
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*
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* PARAMETERS: WalkState - Current state
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* Op - Current parse op
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* CallbackStatus - Status from previous operation
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*
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* RETURN: Status
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*
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* DESCRIPTION: Update the parser state based upon the return exception from
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* the parser callback.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsNextParseState (
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ACPI_WALK_STATE *WalkState,
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ACPI_PARSE_OBJECT *Op,
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ACPI_STATUS CallbackStatus)
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{
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ACPI_PARSE_STATE *ParserState = &WalkState->ParserState;
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ACPI_STATUS Status = AE_CTRL_PENDING;
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ACPI_FUNCTION_TRACE_PTR (PsNextParseState, Op);
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switch (CallbackStatus)
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{
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case AE_CTRL_TERMINATE:
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/*
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* A control method was terminated via a RETURN statement.
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* The walk of this method is complete.
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*/
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ParserState->Aml = ParserState->AmlEnd;
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Status = AE_CTRL_TERMINATE;
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break;
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case AE_CTRL_BREAK:
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ParserState->Aml = WalkState->AmlLastWhile;
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WalkState->ControlState->Common.Value = FALSE;
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Status = AE_CTRL_BREAK;
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break;
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case AE_CTRL_CONTINUE:
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ParserState->Aml = WalkState->AmlLastWhile;
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Status = AE_CTRL_CONTINUE;
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break;
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case AE_CTRL_PENDING:
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ParserState->Aml = WalkState->AmlLastWhile;
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break;
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#if 0
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case AE_CTRL_SKIP:
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ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
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Status = AE_OK;
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break;
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#endif
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case AE_CTRL_TRUE:
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/*
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* Predicate of an IF was true, and we are at the matching ELSE.
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* Just close out this package
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*/
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ParserState->Aml = AcpiPsGetNextPackageEnd (ParserState);
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Status = AE_CTRL_PENDING;
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break;
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case AE_CTRL_FALSE:
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/*
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* Either an IF/WHILE Predicate was false or we encountered a BREAK
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* opcode. In both cases, we do not execute the rest of the
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* package; We simply close out the parent (finishing the walk of
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* this branch of the tree) and continue execution at the parent
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* level.
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*/
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ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
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/* In the case of a BREAK, just force a predicate (if any) to FALSE */
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WalkState->ControlState->Common.Value = FALSE;
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Status = AE_CTRL_END;
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break;
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case AE_CTRL_TRANSFER:
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/* A method call (invocation) -- transfer control */
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Status = AE_CTRL_TRANSFER;
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WalkState->PrevOp = Op;
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WalkState->MethodCallOp = Op;
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WalkState->MethodCallNode = (Op->Common.Value.Arg)->Common.Node;
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/* Will return value (if any) be used by the caller? */
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WalkState->ReturnUsed = AcpiDsIsResultUsed (Op, WalkState);
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break;
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default:
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Status = CallbackStatus;
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if ((CallbackStatus & AE_CODE_MASK) == AE_CODE_CONTROL)
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{
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Status = AE_OK;
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}
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break;
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}
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsParseAml
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*
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* PARAMETERS: WalkState - Current state
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*
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*
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* RETURN: Status
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*
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* DESCRIPTION: Parse raw AML and return a tree of ops
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsParseAml (
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ACPI_WALK_STATE *WalkState)
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{
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ACPI_STATUS Status;
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ACPI_THREAD_STATE *Thread;
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ACPI_THREAD_STATE *PrevWalkList = AcpiGbl_CurrentWalkList;
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ACPI_WALK_STATE *PreviousWalkState;
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ACPI_FUNCTION_TRACE (PsParseAml);
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
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"Entered with WalkState=%p Aml=%p size=%X\n",
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WalkState, WalkState->ParserState.Aml,
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WalkState->ParserState.AmlSize));
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if (!WalkState->ParserState.Aml)
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{
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return_ACPI_STATUS (AE_NULL_OBJECT);
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}
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/* Create and initialize a new thread state */
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Thread = AcpiUtCreateThreadState ();
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if (!Thread)
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{
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if (WalkState->MethodDesc)
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{
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/* Executing a control method - additional cleanup */
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AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
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}
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AcpiDsDeleteWalkState (WalkState);
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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WalkState->Thread = Thread;
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/*
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* If executing a method, the starting SyncLevel is this method's
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* SyncLevel
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*/
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if (WalkState->MethodDesc)
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{
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WalkState->Thread->CurrentSyncLevel = WalkState->MethodDesc->Method.SyncLevel;
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}
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AcpiDsPushWalkState (WalkState, Thread);
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/*
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* This global allows the AML debugger to get a handle to the currently
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* executing control method.
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*/
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AcpiGbl_CurrentWalkList = Thread;
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/*
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* Execute the walk loop as long as there is a valid Walk State. This
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* handles nested control method invocations without recursion.
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*/
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", WalkState));
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Status = AE_OK;
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while (WalkState)
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{
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if (ACPI_SUCCESS (Status))
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{
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/*
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* The ParseLoop executes AML until the method terminates
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* or calls another method.
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*/
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Status = AcpiPsParseLoop (WalkState);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
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"Completed one call to walk loop, %s State=%p\n",
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AcpiFormatException (Status), WalkState));
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if (Status == AE_CTRL_TRANSFER)
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{
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/*
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* A method call was detected.
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* Transfer control to the called control method
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*/
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Status = AcpiDsCallControlMethod (Thread, WalkState, NULL);
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if (ACPI_FAILURE (Status))
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{
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Status = AcpiDsMethodError (Status, WalkState);
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}
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/*
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* If the transfer to the new method method call worked, a new walk
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* state was created -- get it
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*/
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WalkState = AcpiDsGetCurrentWalkState (Thread);
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continue;
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}
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else if (Status == AE_CTRL_TERMINATE)
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{
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Status = AE_OK;
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}
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else if ((Status != AE_OK) && (WalkState->MethodDesc))
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{
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/* Either the method parse or actual execution failed */
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ACPI_ERROR_METHOD ("Method parse/execution failed",
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WalkState->MethodNode, NULL, Status);
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/* Check for possible multi-thread reentrancy problem */
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if ((Status == AE_ALREADY_EXISTS) &&
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(!(WalkState->MethodDesc->Method.InfoFlags & ACPI_METHOD_SERIALIZED)))
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{
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/*
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* Method is not serialized and tried to create an object
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* twice. The probable cause is that the method cannot
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* handle reentrancy. Mark as "pending serialized" now, and
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* then mark "serialized" when the last thread exits.
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*/
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WalkState->MethodDesc->Method.InfoFlags |=
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ACPI_METHOD_SERIALIZED_PENDING;
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}
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}
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/* We are done with this walk, move on to the parent if any */
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WalkState = AcpiDsPopWalkState (Thread);
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/* Reset the current scope to the beginning of scope stack */
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AcpiDsScopeStackClear (WalkState);
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/*
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* If we just returned from the execution of a control method or if we
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* encountered an error during the method parse phase, there's lots of
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* cleanup to do
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*/
|
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if (((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) == ACPI_PARSE_EXECUTE) ||
|
|
(ACPI_FAILURE (Status)))
|
|
{
|
|
AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
|
|
}
|
|
|
|
/* Delete this walk state and all linked control states */
|
|
|
|
AcpiPsCleanupScope (&WalkState->ParserState);
|
|
PreviousWalkState = WalkState;
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
|
|
"ReturnValue=%p, ImplicitValue=%p State=%p\n",
|
|
WalkState->ReturnDesc, WalkState->ImplicitReturnObj, WalkState));
|
|
|
|
/* Check if we have restarted a preempted walk */
|
|
|
|
WalkState = AcpiDsGetCurrentWalkState (Thread);
|
|
if (WalkState)
|
|
{
|
|
if (ACPI_SUCCESS (Status))
|
|
{
|
|
/*
|
|
* There is another walk state, restart it.
|
|
* If the method return value is not used by the parent,
|
|
* The object is deleted
|
|
*/
|
|
if (!PreviousWalkState->ReturnDesc)
|
|
{
|
|
/*
|
|
* In slack mode execution, if there is no return value
|
|
* we should implicitly return zero (0) as a default value.
|
|
*/
|
|
if (AcpiGbl_EnableInterpreterSlack &&
|
|
!PreviousWalkState->ImplicitReturnObj)
|
|
{
|
|
PreviousWalkState->ImplicitReturnObj =
|
|
AcpiUtCreateIntegerObject ((UINT64) 0);
|
|
if (!PreviousWalkState->ImplicitReturnObj)
|
|
{
|
|
return_ACPI_STATUS (AE_NO_MEMORY);
|
|
}
|
|
}
|
|
|
|
/* Restart the calling control method */
|
|
|
|
Status = AcpiDsRestartControlMethod (WalkState,
|
|
PreviousWalkState->ImplicitReturnObj);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* We have a valid return value, delete any implicit
|
|
* return value.
|
|
*/
|
|
AcpiDsClearImplicitReturn (PreviousWalkState);
|
|
|
|
Status = AcpiDsRestartControlMethod (WalkState,
|
|
PreviousWalkState->ReturnDesc);
|
|
}
|
|
if (ACPI_SUCCESS (Status))
|
|
{
|
|
WalkState->WalkType |= ACPI_WALK_METHOD_RESTART;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* On error, delete any return object or implicit return */
|
|
|
|
AcpiUtRemoveReference (PreviousWalkState->ReturnDesc);
|
|
AcpiDsClearImplicitReturn (PreviousWalkState);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Just completed a 1st-level method, save the final internal return
|
|
* value (if any)
|
|
*/
|
|
else if (PreviousWalkState->CallerReturnDesc)
|
|
{
|
|
if (PreviousWalkState->ImplicitReturnObj)
|
|
{
|
|
*(PreviousWalkState->CallerReturnDesc) =
|
|
PreviousWalkState->ImplicitReturnObj;
|
|
}
|
|
else
|
|
{
|
|
/* NULL if no return value */
|
|
|
|
*(PreviousWalkState->CallerReturnDesc) =
|
|
PreviousWalkState->ReturnDesc;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (PreviousWalkState->ReturnDesc)
|
|
{
|
|
/* Caller doesn't want it, must delete it */
|
|
|
|
AcpiUtRemoveReference (PreviousWalkState->ReturnDesc);
|
|
}
|
|
if (PreviousWalkState->ImplicitReturnObj)
|
|
{
|
|
/* Caller doesn't want it, must delete it */
|
|
|
|
AcpiUtRemoveReference (PreviousWalkState->ImplicitReturnObj);
|
|
}
|
|
}
|
|
|
|
AcpiDsDeleteWalkState (PreviousWalkState);
|
|
}
|
|
|
|
/* Normal exit */
|
|
|
|
AcpiExReleaseAllMutexes (Thread);
|
|
AcpiUtDeleteGenericState (ACPI_CAST_PTR (ACPI_GENERIC_STATE, Thread));
|
|
AcpiGbl_CurrentWalkList = PrevWalkList;
|
|
return_ACPI_STATUS (Status);
|
|
}
|