dmwalk.c

acpi tools for linux include acpiexec and acpixtract

/*******************************************************************************
 *
 * Module Name: dmwalk - AML disassembly tree walk
 *              $Revision: 1.34 $
 *
 ******************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp.
 * All rights reserved.
 *
 * 2. License
 *
 * 2.1. This is your license from Intel Corp. under its intellectual property
 * rights.  You may have additional license terms from the party that provided
 * you this software, covering your right to use that party's intellectual
 * property rights.
 *
 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
 * copy of the source code appearing in this file ("Covered Code") an
 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
 * base code distributed originally by Intel ("Original Intel Code") to copy,
 * make derivatives, distribute, use and display any portion of the Covered
 * Code in any form, with the right to sublicense such rights; and
 *
 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
 * license (with the right to sublicense), under only those claims of Intel
 * patents that are infringed by the Original Intel Code, to make, use, sell,
 * offer to sell, and import the Covered Code and derivative works thereof
 * solely to the minimum extent necessary to exercise the above copyright
 * license, and in no event shall the patent license extend to any additions
 * to or modifications of the Original Intel Code.  No other license or right
 * is granted directly or by implication, estoppel or otherwise;
 *
 * The above copyright and patent license is granted only if the following
 * conditions are met:
 *
 * 3. Conditions
 *
 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification with rights to further distribute source must include
 * the above Copyright Notice, the above License, this list of Conditions,
 * and the following Disclaimer and Export Compliance provision.  In addition,
 * Licensee must cause all Covered Code to which Licensee contributes to
 * contain a file documenting the changes Licensee made to create that Covered
 * Code and the date of any change.  Licensee must include in that file the
 * documentation of any changes made by any predecessor Licensee.  Licensee
 * must include a prominent statement that the modification is derived,
 * directly or indirectly, from Original Intel Code.
 *
 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification without rights to further distribute source must
 * include the following Disclaimer and Export Compliance provision in the
 * documentation and/or other materials provided with distribution.  In
 * addition, Licensee may not authorize further sublicense of source of any
 * portion of the Covered Code, and must include terms to the effect that the
 * license from Licensee to its licensee is limited to the intellectual
 * property embodied in the software Licensee provides to its licensee, and
 * not to intellectual property embodied in modifications its licensee may
 * make.
 *
 * 3.3. Redistribution of Executable. Redistribution in executable form of any
 * substantial portion of the Covered Code or modification must reproduce the
 * above Copyright Notice, and the following Disclaimer and Export Compliance
 * provision in the documentation and/or other materials provided with the
 * distribution.
 *
 * 3.4. Intel retains all right, title, and interest in and to the Original
 * Intel Code.
 *
 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
 * Intel shall be used in advertising or otherwise to promote the sale, use or
 * other dealings in products derived from or relating to the Covered Code
 * without prior written authorization from Intel.
 *
 * 4. Disclaimer and Export Compliance
 *
 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
 * PARTICULAR PURPOSE.
 *
 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
 * LIMITED REMEDY.
 *
 * 4.3. Licensee shall not export, either directly or indirectly, any of this
 * software or system incorporating such software without first obtaining any
 * required license or other approval from the U. S. Department of Commerce or
 * any other agency or department of the United States Government.  In the
 * event Licensee exports any such software from the United States or
 * re-exports any such software from a foreign destination, Licensee shall
 * ensure that the distribution and export/re-export of the software is in
 * compliance with all laws, regulations, orders, or other restrictions of the
 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 * any of its subsidiaries will export/re-export any technical data, process,
 * software, or service, directly or indirectly, to any country for which the
 * United States government or any agency thereof requires an export license,
 * other governmental approval, or letter of assurance, without first obtaining
 * such license, approval or letter.
 *
 *****************************************************************************/


#include "acpi.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdisasm.h"
#include "acdebug.h"


#ifdef ACPI_DISASSEMBLER

#define _COMPONENT          ACPI_CA_DEBUGGER
        ACPI_MODULE_NAME    ("dmwalk")


#define DB_FULL_OP_INFO     "[%4.4s] @%5.5X #%4.4X:  "

/* Local prototypes */

static ACPI_STATUS
AcpiDmDescendingOp (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context);

static ACPI_STATUS
AcpiDmAscendingOp (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context);

static UINT32
AcpiDmBlockType (
    ACPI_PARSE_OBJECT       *Op);


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmDisassemble
 *
 * PARAMETERS:  WalkState       - Current state
 *              Origin          - Starting object
 *              NumOpcodes      - Max number of opcodes to be displayed
 *
 * RETURN:      None
 *
 * DESCRIPTION: Disassemble parser object and its children.  This is the
 *              main entry point of the disassembler.
 *
 ******************************************************************************/

void
AcpiDmDisassemble (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Origin,
    UINT32                  NumOpcodes)
{
    ACPI_PARSE_OBJECT       *Op = Origin;
    ACPI_OP_WALK_INFO       Info;


    if (!Op)
    {
        return;
    }

    Info.Flags = 0;
    Info.Level = 0;
    Info.Count = 0;
    Info.WalkState = WalkState;
    AcpiDmWalkParseTree (Op, AcpiDmDescendingOp, AcpiDmAscendingOp, &Info);
    return;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmWalkParseTree
 *
 * PARAMETERS:  Op                      - Root Op object
 *              DescendingCallback      - Called during tree descent
 *              AscendingCallback       - Called during tree ascent
 *              Context                 - To be passed to the callbacks
 *
 * RETURN:      Status from callback(s)
 *
 * DESCRIPTION: Walk the entire parse tree.
 *
 ******************************************************************************/

void
AcpiDmWalkParseTree (
    ACPI_PARSE_OBJECT       *Op,
    ASL_WALK_CALLBACK       DescendingCallback,
    ASL_WALK_CALLBACK       AscendingCallback,
    void                    *Context)
{
    BOOLEAN                 NodePreviouslyVisited;
    ACPI_PARSE_OBJECT       *StartOp = Op;
    ACPI_STATUS             Status;
    ACPI_PARSE_OBJECT       *Next;
    ACPI_OP_WALK_INFO       *Info = Context;


    Info->Level = 0;
    NodePreviouslyVisited = FALSE;

    while (Op)
    {
        if (NodePreviouslyVisited)
        {
            if (AscendingCallback)
            {
                Status = AscendingCallback (Op, Info->Level, Context);
                if (ACPI_FAILURE (Status))
                {
                    return;
                }
            }
        }
        else
        {
            /* Let the callback process the node */

            Status = DescendingCallback (Op, Info->Level, Context);
            if (ACPI_SUCCESS (Status))
            {
                /* Visit children first, once */

                Next = AcpiPsGetArg (Op, 0);
                if (Next)
                {
                    Info->Level++;
                    Op = Next;
                    continue;
                }
            }
            else if (Status != AE_CTRL_DEPTH)
            {
                /* Exit immediately on any error */

                return;
            }
        }

        /* Terminate walk at start op */

        if (Op == StartOp)
        {
            break;
        }

        /* No more children, re-visit this node */

        if (!NodePreviouslyVisited)
        {
            NodePreviouslyVisited = TRUE;
            continue;
        }

        /* No more children, visit peers */

        if (Op->Common.Next)
        {
            Op = Op->Common.Next;
            NodePreviouslyVisited = FALSE;
        }
        else
        {
            /* No peers, re-visit parent */

            if (Info->Level != 0 )
            {
                Info->Level--;
            }

            Op = Op->Common.Parent;
            NodePreviouslyVisited = TRUE;
        }
    }

    /* If we get here, the walk completed with no errors */

    return;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmBlockType
 *
 * PARAMETERS:  Op              - Object to be examined
 *
 * RETURN:      BlockType - not a block, parens, braces, or even both.
 *
 * DESCRIPTION: Type of block for this op (parens or braces)
 *
 ******************************************************************************/

static UINT32
AcpiDmBlockType (
    ACPI_PARSE_OBJECT       *Op)
{
    const ACPI_OPCODE_INFO  *OpInfo;


    if (!Op)
    {
        return (BLOCK_NONE);
    }

    switch (Op->Common.AmlOpcode)
    {
    case AML_ELSE_OP:

        return (BLOCK_BRACE);

    case AML_METHOD_OP:
    case AML_DEVICE_OP:
    case AML_SCOPE_OP:
    case AML_PROCESSOR_OP:
    case AML_POWER_RES_OP:
    case AML_THERMAL_ZONE_OP:
    case AML_IF_OP:
    case AML_WHILE_OP:
    case AML_FIELD_OP:
    case AML_INDEX_FIELD_OP:
    case AML_BANK_FIELD_OP:

        return (BLOCK_PAREN | BLOCK_BRACE);

    case AML_BUFFER_OP:

        if (Op->Common.DisasmOpcode == ACPI_DASM_UNICODE)
        {
            return (BLOCK_NONE);
        }

        /*lint -fallthrough */

    case AML_PACKAGE_OP:
    case AML_VAR_PACKAGE_OP:

        return (BLOCK_PAREN | BLOCK_BRACE);

    case AML_EVENT_OP:

        return (BLOCK_PAREN);

    default:

        OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
        if (OpInfo->Flags & AML_HAS_ARGS)
        {
            return (BLOCK_PAREN);
        }

        return (BLOCK_NONE);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmListType
 *
 * PARAMETERS:  Op              - Object to be examined
 *
 * RETURN:      ListType - has commas or not.
 *
 * DESCRIPTION: Type of block for this op (parens or braces)
 *
 ******************************************************************************/

UINT32
AcpiDmListType (
    ACPI_PARSE_OBJECT       *Op)
{
    const ACPI_OPCODE_INFO  *OpInfo;


    if (!Op)
    {
        return (BLOCK_NONE);
    }

    switch (Op->Common.AmlOpcode)
    {

    case AML_ELSE_OP:
    case AML_METHOD_OP:
    case AML_DEVICE_OP:
    case AML_SCOPE_OP:
    case AML_POWER_RES_OP:
    case AML_PROCESSOR_OP:
    case AML_THERMAL_ZONE_OP:
    case AML_IF_OP:
    case AML_WHILE_OP:
    case AML_FIELD_OP:
    case AML_INDEX_FIELD_OP:
    case AML_BANK_FIELD_OP:

        return (BLOCK_NONE);

    case AML_BUFFER_OP:
    case AML_PACKAGE_OP:
    case AML_VAR_PACKAGE_OP:

        return (BLOCK_COMMA_LIST);

    default:

        OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
        if (OpInfo->Flags & AML_HAS_ARGS)
        {
            return (BLOCK_COMMA_LIST);
        }

        return (BLOCK_NONE);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmDescendingOp
 *
 * PARAMETERS:  ASL_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: First visitation of a parse object during tree descent.
 *              Decode opcode name and begin parameter list(s), if any.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDmDescendingOp (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{
    ACPI_OP_WALK_INFO       *Info = Context;
    const ACPI_OPCODE_INFO  *OpInfo;
    UINT32                  Name;
    ACPI_PARSE_OBJECT       *NextOp;
    ACPI_EXTERNAL_LIST      *NextExternal;


    if (Op->Common.DisasmFlags & ACPI_PARSEOP_IGNORE)
    {
        /* Ignore this op -- it was handled elsewhere */

        return (AE_CTRL_DEPTH);
    }

    /* Level 0 is at the Definition Block level */

    if (Level == 0)
    {
        /* In verbose mode, print the AML offset, opcode and depth count */

        if (Info->WalkState)
        {
            VERBOSE_PRINT ((DB_FULL_OP_INFO,
                (Info->WalkState->MethodNode ?
                    Info->WalkState->MethodNode->Name.Ascii : "   "),
                Op->Common.AmlOffset, (UINT32) Op->Common.AmlOpcode));
        }

        if (Op->Common.AmlOpcode == AML_SCOPE_OP)
        {
            /* This is the beginning of the Definition Block */

            AcpiOsPrintf ("{\n");

            /* Emit all External() declarations here */

            if (AcpiGbl_ExternalList)
            {
                /*
                 * Walk the list of externals (unresolved references)
                 * found during parsing
                 */
                while (AcpiGbl_ExternalList)
                {
                    AcpiOsPrintf ("    External (%s",
                        AcpiGbl_ExternalList->Path);

                    /* TBD: should be a lookup table */

                    switch (AcpiGbl_ExternalList->Type)
                    {
                    case ACPI_TYPE_DEVICE:
                        AcpiOsPrintf (", DeviceObj");
                        break;

                    case ACPI_TYPE_METHOD:
                        AcpiOsPrintf (", MethodObj");
                        break;

                    case ACPI_TYPE_INTEGER:
                        AcpiOsPrintf (", IntObj");
                        break;

                    default:
                        break;