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  1. /*******************************************************************************
  2.  *
  3.  * Module Name: dbxface - AML Debugger external interfaces
  4.  *
  5.  ******************************************************************************/
  6.  
  7. /******************************************************************************
  8.  *
  9.  * 1. Copyright Notice
  10.  *
  11.  * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
  12.  * All rights reserved.
  13.  *
  14.  * 2. License
  15.  *
  16.  * 2.1. This is your license from Intel Corp. under its intellectual property
  17.  * rights.  You may have additional license terms from the party that provided
  18.  * you this software, covering your right to use that party's intellectual
  19.  * property rights.
  20.  *
  21.  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  22.  * copy of the source code appearing in this file ("Covered Code") an
  23.  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  24.  * base code distributed originally by Intel ("Original Intel Code") to copy,
  25.  * make derivatives, distribute, use and display any portion of the Covered
  26.  * Code in any form, with the right to sublicense such rights; and
  27.  *
  28.  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  29.  * license (with the right to sublicense), under only those claims of Intel
  30.  * patents that are infringed by the Original Intel Code, to make, use, sell,
  31.  * offer to sell, and import the Covered Code and derivative works thereof
  32.  * solely to the minimum extent necessary to exercise the above copyright
  33.  * license, and in no event shall the patent license extend to any additions
  34.  * to or modifications of the Original Intel Code.  No other license or right
  35.  * is granted directly or by implication, estoppel or otherwise;
  36.  *
  37.  * The above copyright and patent license is granted only if the following
  38.  * conditions are met:
  39.  *
  40.  * 3. Conditions
  41.  *
  42.  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  43.  * Redistribution of source code of any substantial portion of the Covered
  44.  * Code or modification with rights to further distribute source must include
  45.  * the above Copyright Notice, the above License, this list of Conditions,
  46.  * and the following Disclaimer and Export Compliance provision.  In addition,
  47.  * Licensee must cause all Covered Code to which Licensee contributes to
  48.  * contain a file documenting the changes Licensee made to create that Covered
  49.  * Code and the date of any change.  Licensee must include in that file the
  50.  * documentation of any changes made by any predecessor Licensee.  Licensee
  51.  * must include a prominent statement that the modification is derived,
  52.  * directly or indirectly, from Original Intel Code.
  53.  *
  54.  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  55.  * Redistribution of source code of any substantial portion of the Covered
  56.  * Code or modification without rights to further distribute source must
  57.  * include the following Disclaimer and Export Compliance provision in the
  58.  * documentation and/or other materials provided with distribution.  In
  59.  * addition, Licensee may not authorize further sublicense of source of any
  60.  * portion of the Covered Code, and must include terms to the effect that the
  61.  * license from Licensee to its licensee is limited to the intellectual
  62.  * property embodied in the software Licensee provides to its licensee, and
  63.  * not to intellectual property embodied in modifications its licensee may
  64.  * make.
  65.  *
  66.  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  67.  * substantial portion of the Covered Code or modification must reproduce the
  68.  * above Copyright Notice, and the following Disclaimer and Export Compliance
  69.  * provision in the documentation and/or other materials provided with the
  70.  * distribution.
  71.  *
  72.  * 3.4. Intel retains all right, title, and interest in and to the Original
  73.  * Intel Code.
  74.  *
  75.  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  76.  * Intel shall be used in advertising or otherwise to promote the sale, use or
  77.  * other dealings in products derived from or relating to the Covered Code
  78.  * without prior written authorization from Intel.
  79.  *
  80.  * 4. Disclaimer and Export Compliance
  81.  *
  82.  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  83.  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  84.  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  85.  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  86.  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  87.  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  88.  * PARTICULAR PURPOSE.
  89.  *
  90.  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  91.  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  92.  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  93.  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  94.  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  95.  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  96.  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  97.  * LIMITED REMEDY.
  98.  *
  99.  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  100.  * software or system incorporating such software without first obtaining any
  101.  * required license or other approval from the U. S. Department of Commerce or
  102.  * any other agency or department of the United States Government.  In the
  103.  * event Licensee exports any such software from the United States or
  104.  * re-exports any such software from a foreign destination, Licensee shall
  105.  * ensure that the distribution and export/re-export of the software is in
  106.  * compliance with all laws, regulations, orders, or other restrictions of the
  107.  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  108.  * any of its subsidiaries will export/re-export any technical data, process,
  109.  * software, or service, directly or indirectly, to any country for which the
  110.  * United States government or any agency thereof requires an export license,
  111.  * other governmental approval, or letter of assurance, without first obtaining
  112.  * such license, approval or letter.
  113.  *
  114.  *****************************************************************************/
  115.  
  116.  
  117. #include "acpi.h"
  118. #include "accommon.h"
  119. #include "amlcode.h"
  120. #include "acdebug.h"
  121. #include "acdisasm.h"
  122.  
  123.  
  124. #ifdef ACPI_DEBUGGER
  125.  
  126. #define _COMPONENT          ACPI_CA_DEBUGGER
  127.         ACPI_MODULE_NAME    ("dbxface")
  128.  
  129.  
  130. /* Local prototypes */
  131.  
  132. static ACPI_STATUS
  133. AcpiDbStartCommand (
  134.     ACPI_WALK_STATE         *WalkState,
  135.     ACPI_PARSE_OBJECT       *Op);
  136.  
  137. #ifdef ACPI_OBSOLETE_FUNCTIONS
  138. void
  139. AcpiDbMethodEnd (
  140.     ACPI_WALK_STATE         *WalkState);
  141. #endif
  142.  
  143.  
  144. /*******************************************************************************
  145.  *
  146.  * FUNCTION:    AcpiDbStartCommand
  147.  *
  148.  * PARAMETERS:  WalkState       - Current walk
  149.  *              Op              - Current executing Op, from AML interpreter
  150.  *
  151.  * RETURN:      Status
  152.  *
  153.  * DESCRIPTION: Enter debugger command loop
  154.  *
  155.  ******************************************************************************/
  156.  
  157. static ACPI_STATUS
  158. AcpiDbStartCommand (
  159.     ACPI_WALK_STATE         *WalkState,
  160.     ACPI_PARSE_OBJECT       *Op)
  161. {
  162.     ACPI_STATUS             Status;
  163.  
  164.  
  165.     /* TBD: [Investigate] are there namespace locking issues here? */
  166.  
  167.     /* AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); */
  168.  
  169.     /* Go into the command loop and await next user command */
  170.  
  171.  
  172.     AcpiGbl_MethodExecuting = TRUE;
  173.     Status = AE_CTRL_TRUE;
  174.     while (Status == AE_CTRL_TRUE)
  175.     {
  176.         if (AcpiGbl_DebuggerConfiguration == DEBUGGER_MULTI_THREADED)
  177.         {
  178.             /* Handshake with the front-end that gets user command lines */
  179.  
  180.             Status = AcpiUtReleaseMutex (ACPI_MTX_DEBUG_CMD_COMPLETE);
  181.             if (ACPI_FAILURE (Status))
  182.             {
  183.                 return (Status);
  184.             }
  185.             Status = AcpiUtAcquireMutex (ACPI_MTX_DEBUG_CMD_READY);
  186.             if (ACPI_FAILURE (Status))
  187.             {
  188.                 return (Status);
  189.             }
  190.         }
  191.         else
  192.         {
  193.             /* Single threaded, we must get a command line ourselves */
  194.  
  195.             /* Force output to console until a command is entered */
  196.  
  197.             AcpiDbSetOutputDestination (ACPI_DB_CONSOLE_OUTPUT);
  198.  
  199.             /* Different prompt if method is executing */
  200.  
  201.             if (!AcpiGbl_MethodExecuting)
  202.             {
  203.                 AcpiOsPrintf ("%1c ", ACPI_DEBUGGER_COMMAND_PROMPT);
  204.             }
  205.             else
  206.             {
  207.                 AcpiOsPrintf ("%1c ", ACPI_DEBUGGER_EXECUTE_PROMPT);
  208.             }
  209.  
  210.             /* Get the user input line */
  211.  
  212.             Status = AcpiOsGetLine (AcpiGbl_DbLineBuf,
  213.                 ACPI_DB_LINE_BUFFER_SIZE, NULL);
  214.             if (ACPI_FAILURE (Status))
  215.             {
  216.                 ACPI_EXCEPTION ((AE_INFO, Status, "While parsing command line"));
  217.                 return (Status);
  218.             }
  219.         }
  220.  
  221.         Status = AcpiDbCommandDispatch (AcpiGbl_DbLineBuf, WalkState, Op);
  222.     }
  223.  
  224.     /* AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); */
  225.  
  226.     return (Status);
  227. }
  228.  
  229.  
  230. /*******************************************************************************
  231.  *
  232.  * FUNCTION:    AcpiDbSingleStep
  233.  *
  234.  * PARAMETERS:  WalkState       - Current walk
  235.  *              Op              - Current executing op (from aml interpreter)
  236.  *              OpcodeClass     - Class of the current AML Opcode
  237.  *
  238.  * RETURN:      Status
  239.  *
  240.  * DESCRIPTION: Called just before execution of an AML opcode.
  241.  *
  242.  ******************************************************************************/
  243.  
  244. ACPI_STATUS
  245. AcpiDbSingleStep (
  246.     ACPI_WALK_STATE         *WalkState,
  247.     ACPI_PARSE_OBJECT       *Op,
  248.     UINT32                  OpcodeClass)
  249. {
  250.     ACPI_PARSE_OBJECT       *Next;
  251.     ACPI_STATUS             Status = AE_OK;
  252.     UINT32                  OriginalDebugLevel;
  253.     ACPI_PARSE_OBJECT       *DisplayOp;
  254.     ACPI_PARSE_OBJECT       *ParentOp;
  255.  
  256.  
  257.     ACPI_FUNCTION_ENTRY ();
  258.  
  259.  
  260.     /* Check the abort flag */
  261.  
  262.     if (AcpiGbl_AbortMethod)
  263.     {
  264.         AcpiGbl_AbortMethod = FALSE;
  265.         return (AE_ABORT_METHOD);
  266.     }
  267.  
  268.     /* Check for single-step breakpoint */
  269.  
  270.     if (WalkState->MethodBreakpoint &&
  271.        (WalkState->MethodBreakpoint <= Op->Common.AmlOffset))
  272.     {
  273.         /* Check if the breakpoint has been reached or passed */
  274.         /* Hit the breakpoint, resume single step, reset breakpoint */
  275.  
  276.         AcpiOsPrintf ("***Break*** at AML offset %X\n", Op->Common.AmlOffset);
  277.         AcpiGbl_CmSingleStep = TRUE;
  278.         AcpiGbl_StepToNextCall = FALSE;
  279.         WalkState->MethodBreakpoint = 0;
  280.     }
  281.  
  282.     /* Check for user breakpoint (Must be on exact Aml offset) */
  283.  
  284.     else if (WalkState->UserBreakpoint &&
  285.             (WalkState->UserBreakpoint == Op->Common.AmlOffset))
  286.     {
  287.         AcpiOsPrintf ("***UserBreakpoint*** at AML offset %X\n",
  288.             Op->Common.AmlOffset);
  289.         AcpiGbl_CmSingleStep = TRUE;
  290.         AcpiGbl_StepToNextCall = FALSE;
  291.         WalkState->MethodBreakpoint = 0;
  292.     }
  293.  
  294.     /*
  295.      * Check if this is an opcode that we are interested in --
  296.      * namely, opcodes that have arguments
  297.      */
  298.     if (Op->Common.AmlOpcode == AML_INT_NAMEDFIELD_OP)
  299.     {
  300.         return (AE_OK);
  301.     }
  302.  
  303.     switch (OpcodeClass)
  304.     {
  305.     case AML_CLASS_UNKNOWN:
  306.     case AML_CLASS_ARGUMENT:    /* constants, literals, etc.  do nothing */
  307.         return (AE_OK);
  308.  
  309.     default:
  310.         /* All other opcodes -- continue */
  311.         break;
  312.     }
  313.  
  314.     /*
  315.      * Under certain debug conditions, display this opcode and its operands
  316.      */
  317.     if ((AcpiGbl_DbOutputToFile)            ||
  318.         (AcpiGbl_CmSingleStep)              ||
  319.         (AcpiDbgLevel & ACPI_LV_PARSE))
  320.     {
  321.         if ((AcpiGbl_DbOutputToFile)        ||
  322.             (AcpiDbgLevel & ACPI_LV_PARSE))
  323.         {
  324.             AcpiOsPrintf ("\n[AmlDebug] Next AML Opcode to execute:\n");
  325.         }
  326.  
  327.         /*
  328.          * Display this op (and only this op - zero out the NEXT field
  329.          * temporarily, and disable parser trace output for the duration of
  330.          * the display because we don't want the extraneous debug output)
  331.          */
  332.         OriginalDebugLevel = AcpiDbgLevel;
  333.         AcpiDbgLevel &= ~(ACPI_LV_PARSE | ACPI_LV_FUNCTIONS);
  334.         Next = Op->Common.Next;
  335.         Op->Common.Next = NULL;
  336.  
  337.  
  338.         DisplayOp = Op;
  339.         ParentOp = Op->Common.Parent;
  340.         if (ParentOp)
  341.         {
  342.             if ((WalkState->ControlState) &&
  343.                 (WalkState->ControlState->Common.State ==
  344.                     ACPI_CONTROL_PREDICATE_EXECUTING))
  345.             {
  346.                 /*
  347.                  * We are executing the predicate of an IF or WHILE statement
  348.                  * Search upwards for the containing IF or WHILE so that the
  349.                  * entire predicate can be displayed.
  350.                  */
  351.                 while (ParentOp)
  352.                 {
  353.                     if ((ParentOp->Common.AmlOpcode == AML_IF_OP) ||
  354.                         (ParentOp->Common.AmlOpcode == AML_WHILE_OP))
  355.                     {
  356.                         DisplayOp = ParentOp;
  357.                         break;
  358.                     }
  359.                     ParentOp = ParentOp->Common.Parent;
  360.                 }
  361.             }
  362.             else
  363.             {
  364.                 while (ParentOp)
  365.                 {
  366.                     if ((ParentOp->Common.AmlOpcode == AML_IF_OP)     ||
  367.                         (ParentOp->Common.AmlOpcode == AML_ELSE_OP)   ||
  368.                         (ParentOp->Common.AmlOpcode == AML_SCOPE_OP)  ||
  369.                         (ParentOp->Common.AmlOpcode == AML_METHOD_OP) ||
  370.                         (ParentOp->Common.AmlOpcode == AML_WHILE_OP))
  371.                     {
  372.                         break;
  373.                     }
  374.                     DisplayOp = ParentOp;
  375.                     ParentOp = ParentOp->Common.Parent;
  376.                 }
  377.             }
  378.         }
  379.  
  380.         /* Now we can display it */
  381.  
  382.         AcpiDmDisassemble (WalkState, DisplayOp, ACPI_UINT32_MAX);
  383.  
  384.         if ((Op->Common.AmlOpcode == AML_IF_OP) ||
  385.             (Op->Common.AmlOpcode == AML_WHILE_OP))
  386.         {
  387.             if (WalkState->ControlState->Common.Value)
  388.             {
  389.                 AcpiOsPrintf ("Predicate = [True], IF block was executed\n");
  390.             }
  391.             else
  392.             {
  393.                 AcpiOsPrintf ("Predicate = [False], Skipping IF block\n");
  394.             }
  395.         }
  396.         else if (Op->Common.AmlOpcode == AML_ELSE_OP)
  397.         {
  398.             AcpiOsPrintf ("Predicate = [False], ELSE block was executed\n");
  399.         }
  400.  
  401.         /* Restore everything */
  402.  
  403.         Op->Common.Next = Next;
  404.         AcpiOsPrintf ("\n");
  405.         if ((AcpiGbl_DbOutputToFile)        ||
  406.             (AcpiDbgLevel & ACPI_LV_PARSE))
  407.         {
  408.             AcpiOsPrintf ("\n");
  409.         }
  410.         AcpiDbgLevel = OriginalDebugLevel;
  411.     }
  412.  
  413.     /* If we are not single stepping, just continue executing the method */
  414.  
  415.     if (!AcpiGbl_CmSingleStep)
  416.     {
  417.         return (AE_OK);
  418.     }
  419.  
  420.     /*
  421.      * If we are executing a step-to-call command,
  422.      * Check if this is a method call.
  423.      */
  424.     if (AcpiGbl_StepToNextCall)
  425.     {
  426.         if (Op->Common.AmlOpcode != AML_INT_METHODCALL_OP)
  427.         {
  428.             /* Not a method call, just keep executing */
  429.  
  430.             return (AE_OK);
  431.         }
  432.  
  433.         /* Found a method call, stop executing */
  434.  
  435.         AcpiGbl_StepToNextCall = FALSE;
  436.     }
  437.  
  438.     /*
  439.      * If the next opcode is a method call, we will "step over" it
  440.      * by default.
  441.      */
  442.     if (Op->Common.AmlOpcode == AML_INT_METHODCALL_OP)
  443.     {
  444.         /* Force no more single stepping while executing called method */
  445.  
  446.         AcpiGbl_CmSingleStep = FALSE;
  447.  
  448.         /*
  449.          * Set the breakpoint on/before the call, it will stop execution
  450.          * as soon as we return
  451.          */
  452.         WalkState->MethodBreakpoint = 1;  /* Must be non-zero! */
  453.     }
  454.  
  455.  
  456.     Status = AcpiDbStartCommand (WalkState, Op);
  457.  
  458.     /* User commands complete, continue execution of the interrupted method */
  459.  
  460.     return (Status);
  461. }
  462.  
  463.  
  464. /*******************************************************************************
  465.  *
  466.  * FUNCTION:    AcpiDbInitialize
  467.  *
  468.  * PARAMETERS:  None
  469.  *
  470.  * RETURN:      Status
  471.  *
  472.  * DESCRIPTION: Init and start debugger
  473.  *
  474.  ******************************************************************************/
  475.  
  476. ACPI_STATUS
  477. AcpiDbInitialize (
  478.     void)
  479. {
  480.     ACPI_STATUS             Status;
  481.  
  482.  
  483.     /* Init globals */
  484.  
  485.     AcpiGbl_DbBuffer            = NULL;
  486.     AcpiGbl_DbFilename          = NULL;
  487.     AcpiGbl_DbOutputToFile      = FALSE;
  488.  
  489.     AcpiGbl_DbDebugLevel        = ACPI_LV_VERBOSITY2;
  490.     AcpiGbl_DbConsoleDebugLevel = ACPI_NORMAL_DEFAULT | ACPI_LV_TABLES;
  491.     AcpiGbl_DbOutputFlags       = ACPI_DB_CONSOLE_OUTPUT;
  492.  
  493.     AcpiGbl_DbOpt_tables        = FALSE;
  494.     AcpiGbl_DbOpt_disasm        = FALSE;
  495.     AcpiGbl_DbOpt_stats         = FALSE;
  496.     AcpiGbl_DbOpt_verbose       = TRUE;
  497.     AcpiGbl_DbOpt_ini_methods   = TRUE;
  498.  
  499.     AcpiGbl_DbBuffer = AcpiOsAllocate (ACPI_DEBUG_BUFFER_SIZE);
  500.     if (!AcpiGbl_DbBuffer)
  501.     {
  502.         return (AE_NO_MEMORY);
  503.     }
  504.     ACPI_MEMSET (AcpiGbl_DbBuffer, 0, ACPI_DEBUG_BUFFER_SIZE);
  505.  
  506.     /* Initial scope is the root */
  507.  
  508.     AcpiGbl_DbScopeBuf [0] = '\\';
  509.     AcpiGbl_DbScopeBuf [1] =  0;
  510.     AcpiGbl_DbScopeNode = AcpiGbl_RootNode;
  511.  
  512.     /*
  513.      * If configured for multi-thread support, the debug executor runs in
  514.      * a separate thread so that the front end can be in another address
  515.      * space, environment, or even another machine.
  516.      */
  517.     if (AcpiGbl_DebuggerConfiguration & DEBUGGER_MULTI_THREADED)
  518.     {
  519.         /* These were created with one unit, grab it */
  520.  
  521.         Status = AcpiUtAcquireMutex (ACPI_MTX_DEBUG_CMD_COMPLETE);
  522.         if (ACPI_FAILURE (Status))
  523.         {
  524.             AcpiOsPrintf ("Could not get debugger mutex\n");
  525.             return (Status);
  526.         }
  527.  
  528.         Status = AcpiUtAcquireMutex (ACPI_MTX_DEBUG_CMD_READY);
  529.         if (ACPI_FAILURE (Status))
  530.         {
  531.             AcpiOsPrintf ("Could not get debugger mutex\n");
  532.             return (Status);
  533.         }
  534.  
  535.         /* Create the debug execution thread to execute commands */
  536.  
  537.         Status = AcpiOsExecute (OSL_DEBUGGER_THREAD, AcpiDbExecuteThread, NULL);
  538.         if (ACPI_FAILURE (Status))
  539.         {
  540.             AcpiOsPrintf ("Could not start debugger thread\n");
  541.             return (Status);
  542.         }
  543.     }
  544.  
  545.     if (!AcpiGbl_DbOpt_verbose)
  546.     {
  547.         AcpiGbl_DbOpt_disasm = TRUE;
  548.         AcpiGbl_DbOpt_stats = FALSE;
  549.     }
  550.  
  551.     return (AE_OK);
  552. }
  553.  
  554.  
  555. /*******************************************************************************
  556.  *
  557.  * FUNCTION:    AcpiDbTerminate
  558.  *
  559.  * PARAMETERS:  None
  560.  *
  561.  * RETURN:      None
  562.  *
  563.  * DESCRIPTION: Stop debugger
  564.  *
  565.  ******************************************************************************/
  566.  
  567. void
  568. AcpiDbTerminate (
  569.     void)
  570. {
  571.  
  572.     if (AcpiGbl_DbBuffer)
  573.     {
  574.         AcpiOsFree (AcpiGbl_DbBuffer);
  575.     }
  576. }
  577.  
  578.  
  579. #ifdef ACPI_OBSOLETE_FUNCTIONS
  580. /*******************************************************************************
  581.  *
  582.  * FUNCTION:    AcpiDbMethodEnd
  583.  *
  584.  * PARAMETERS:  WalkState       - Current walk
  585.  *
  586.  * RETURN:      Status
  587.  *
  588.  * DESCRIPTION: Called at method termination
  589.  *
  590.  ******************************************************************************/
  591.  
  592. void
  593. AcpiDbMethodEnd (
  594.     ACPI_WALK_STATE         *WalkState)
  595. {
  596.  
  597.     if (!AcpiGbl_CmSingleStep)
  598.     {
  599.         return;
  600.     }
  601.  
  602.     AcpiOsPrintf ("<Method Terminating>\n");
  603.  
  604.     AcpiDbStartCommand (WalkState, NULL);
  605. }
  606. #endif
  607.  
  608. #endif /* ACPI_DEBUGGER */
  609.