415 lines
13 KiB
C
415 lines
13 KiB
C
/******************************************************************************
|
|
*
|
|
* Module Name: dscontrol - Support for execution control opcodes -
|
|
* if/else/while/return
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2015, 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.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <contrib/dev/acpica/include/acpi.h>
|
|
#include <contrib/dev/acpica/include/accommon.h>
|
|
#include <contrib/dev/acpica/include/amlcode.h>
|
|
#include <contrib/dev/acpica/include/acdispat.h>
|
|
#include <contrib/dev/acpica/include/acinterp.h>
|
|
|
|
#define _COMPONENT ACPI_DISPATCHER
|
|
ACPI_MODULE_NAME ("dscontrol")
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiDsExecBeginControlOp
|
|
*
|
|
* PARAMETERS: WalkList - The list that owns the walk stack
|
|
* Op - The control Op
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Handles all control ops encountered during control method
|
|
* execution.
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiDsExecBeginControlOp (
|
|
ACPI_WALK_STATE *WalkState,
|
|
ACPI_PARSE_OBJECT *Op)
|
|
{
|
|
ACPI_STATUS Status = AE_OK;
|
|
ACPI_GENERIC_STATE *ControlState;
|
|
|
|
|
|
ACPI_FUNCTION_NAME (DsExecBeginControlOp);
|
|
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
|
|
Op, Op->Common.AmlOpcode, WalkState));
|
|
|
|
switch (Op->Common.AmlOpcode)
|
|
{
|
|
case AML_WHILE_OP:
|
|
/*
|
|
* If this is an additional iteration of a while loop, continue.
|
|
* There is no need to allocate a new control state.
|
|
*/
|
|
if (WalkState->ControlState)
|
|
{
|
|
if (WalkState->ControlState->Control.AmlPredicateStart ==
|
|
(WalkState->ParserState.Aml - 1))
|
|
{
|
|
/* Reset the state to start-of-loop */
|
|
|
|
WalkState->ControlState->Common.State =
|
|
ACPI_CONTROL_CONDITIONAL_EXECUTING;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*lint -fallthrough */
|
|
|
|
case AML_IF_OP:
|
|
/*
|
|
* IF/WHILE: Create a new control state to manage these
|
|
* constructs. We need to manage these as a stack, in order
|
|
* to handle nesting.
|
|
*/
|
|
ControlState = AcpiUtCreateControlState ();
|
|
if (!ControlState)
|
|
{
|
|
Status = AE_NO_MEMORY;
|
|
break;
|
|
}
|
|
/*
|
|
* Save a pointer to the predicate for multiple executions
|
|
* of a loop
|
|
*/
|
|
ControlState->Control.AmlPredicateStart = WalkState->ParserState.Aml - 1;
|
|
ControlState->Control.PackageEnd = WalkState->ParserState.PkgEnd;
|
|
ControlState->Control.Opcode = Op->Common.AmlOpcode;
|
|
|
|
|
|
/* Push the control state on this walk's control stack */
|
|
|
|
AcpiUtPushGenericState (&WalkState->ControlState, ControlState);
|
|
break;
|
|
|
|
case AML_ELSE_OP:
|
|
|
|
/* Predicate is in the state object */
|
|
/* If predicate is true, the IF was executed, ignore ELSE part */
|
|
|
|
if (WalkState->LastPredicate)
|
|
{
|
|
Status = AE_CTRL_TRUE;
|
|
}
|
|
|
|
break;
|
|
|
|
case AML_RETURN_OP:
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
}
|
|
|
|
return (Status);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiDsExecEndControlOp
|
|
*
|
|
* PARAMETERS: WalkList - The list that owns the walk stack
|
|
* Op - The control Op
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Handles all control ops encountered during control method
|
|
* execution.
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiDsExecEndControlOp (
|
|
ACPI_WALK_STATE *WalkState,
|
|
ACPI_PARSE_OBJECT *Op)
|
|
{
|
|
ACPI_STATUS Status = AE_OK;
|
|
ACPI_GENERIC_STATE *ControlState;
|
|
|
|
|
|
ACPI_FUNCTION_NAME (DsExecEndControlOp);
|
|
|
|
|
|
switch (Op->Common.AmlOpcode)
|
|
{
|
|
case AML_IF_OP:
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", Op));
|
|
|
|
/*
|
|
* Save the result of the predicate in case there is an
|
|
* ELSE to come
|
|
*/
|
|
WalkState->LastPredicate =
|
|
(BOOLEAN) WalkState->ControlState->Common.Value;
|
|
|
|
/*
|
|
* Pop the control state that was created at the start
|
|
* of the IF and free it
|
|
*/
|
|
ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
|
|
AcpiUtDeleteGenericState (ControlState);
|
|
break;
|
|
|
|
case AML_ELSE_OP:
|
|
|
|
break;
|
|
|
|
case AML_WHILE_OP:
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", Op));
|
|
|
|
ControlState = WalkState->ControlState;
|
|
if (ControlState->Common.Value)
|
|
{
|
|
/* Predicate was true, the body of the loop was just executed */
|
|
|
|
/*
|
|
* This loop counter mechanism allows the interpreter to escape
|
|
* possibly infinite loops. This can occur in poorly written AML
|
|
* when the hardware does not respond within a while loop and the
|
|
* loop does not implement a timeout.
|
|
*/
|
|
ControlState->Control.LoopCount++;
|
|
if (ControlState->Control.LoopCount > AcpiGbl_MaxLoopIterations)
|
|
{
|
|
Status = AE_AML_INFINITE_LOOP;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Go back and evaluate the predicate and maybe execute the loop
|
|
* another time
|
|
*/
|
|
Status = AE_CTRL_PENDING;
|
|
WalkState->AmlLastWhile = ControlState->Control.AmlPredicateStart;
|
|
break;
|
|
}
|
|
|
|
/* Predicate was false, terminate this while loop */
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
|
|
"[WHILE_OP] termination! Op=%p\n",Op));
|
|
|
|
/* Pop this control state and free it */
|
|
|
|
ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
|
|
AcpiUtDeleteGenericState (ControlState);
|
|
break;
|
|
|
|
case AML_RETURN_OP:
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
|
|
"[RETURN_OP] Op=%p Arg=%p\n",Op, Op->Common.Value.Arg));
|
|
|
|
/*
|
|
* One optional operand -- the return value
|
|
* It can be either an immediate operand or a result that
|
|
* has been bubbled up the tree
|
|
*/
|
|
if (Op->Common.Value.Arg)
|
|
{
|
|
/* Since we have a real Return(), delete any implicit return */
|
|
|
|
AcpiDsClearImplicitReturn (WalkState);
|
|
|
|
/* Return statement has an immediate operand */
|
|
|
|
Status = AcpiDsCreateOperands (WalkState, Op->Common.Value.Arg);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return (Status);
|
|
}
|
|
|
|
/*
|
|
* If value being returned is a Reference (such as
|
|
* an arg or local), resolve it now because it may
|
|
* cease to exist at the end of the method.
|
|
*/
|
|
Status = AcpiExResolveToValue (&WalkState->Operands [0], WalkState);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return (Status);
|
|
}
|
|
|
|
/*
|
|
* Get the return value and save as the last result
|
|
* value. This is the only place where WalkState->ReturnDesc
|
|
* is set to anything other than zero!
|
|
*/
|
|
WalkState->ReturnDesc = WalkState->Operands[0];
|
|
}
|
|
else if (WalkState->ResultCount)
|
|
{
|
|
/* Since we have a real Return(), delete any implicit return */
|
|
|
|
AcpiDsClearImplicitReturn (WalkState);
|
|
|
|
/*
|
|
* The return value has come from a previous calculation.
|
|
*
|
|
* If value being returned is a Reference (such as
|
|
* an arg or local), resolve it now because it may
|
|
* cease to exist at the end of the method.
|
|
*
|
|
* Allow references created by the Index operator to return
|
|
* unchanged.
|
|
*/
|
|
if ((ACPI_GET_DESCRIPTOR_TYPE (WalkState->Results->Results.ObjDesc[0]) == ACPI_DESC_TYPE_OPERAND) &&
|
|
((WalkState->Results->Results.ObjDesc [0])->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
|
|
((WalkState->Results->Results.ObjDesc [0])->Reference.Class != ACPI_REFCLASS_INDEX))
|
|
{
|
|
Status = AcpiExResolveToValue (&WalkState->Results->Results.ObjDesc [0], WalkState);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return (Status);
|
|
}
|
|
}
|
|
|
|
WalkState->ReturnDesc = WalkState->Results->Results.ObjDesc [0];
|
|
}
|
|
else
|
|
{
|
|
/* No return operand */
|
|
|
|
if (WalkState->NumOperands)
|
|
{
|
|
AcpiUtRemoveReference (WalkState->Operands [0]);
|
|
}
|
|
|
|
WalkState->Operands [0] = NULL;
|
|
WalkState->NumOperands = 0;
|
|
WalkState->ReturnDesc = NULL;
|
|
}
|
|
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
|
|
"Completed RETURN_OP State=%p, RetVal=%p\n",
|
|
WalkState, WalkState->ReturnDesc));
|
|
|
|
/* End the control method execution right now */
|
|
|
|
Status = AE_CTRL_TERMINATE;
|
|
break;
|
|
|
|
case AML_NOOP_OP:
|
|
|
|
/* Just do nothing! */
|
|
|
|
break;
|
|
|
|
case AML_BREAK_POINT_OP:
|
|
|
|
/*
|
|
* Set the single-step flag. This will cause the debugger (if present)
|
|
* to break to the console within the AML debugger at the start of the
|
|
* next AML instruction.
|
|
*/
|
|
ACPI_DEBUGGER_EXEC (
|
|
AcpiGbl_CmSingleStep = TRUE);
|
|
ACPI_DEBUGGER_EXEC (
|
|
AcpiOsPrintf ("**break** Executed AML BreakPoint opcode\n"));
|
|
|
|
/* Call to the OSL in case OS wants a piece of the action */
|
|
|
|
Status = AcpiOsSignal (ACPI_SIGNAL_BREAKPOINT,
|
|
"Executed AML Breakpoint opcode");
|
|
break;
|
|
|
|
case AML_BREAK_OP:
|
|
case AML_CONTINUE_OP: /* ACPI 2.0 */
|
|
|
|
/* Pop and delete control states until we find a while */
|
|
|
|
while (WalkState->ControlState &&
|
|
(WalkState->ControlState->Control.Opcode != AML_WHILE_OP))
|
|
{
|
|
ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
|
|
AcpiUtDeleteGenericState (ControlState);
|
|
}
|
|
|
|
/* No while found? */
|
|
|
|
if (!WalkState->ControlState)
|
|
{
|
|
return (AE_AML_NO_WHILE);
|
|
}
|
|
|
|
/* Was: WalkState->AmlLastWhile = WalkState->ControlState->Control.AmlPredicateStart; */
|
|
|
|
WalkState->AmlLastWhile = WalkState->ControlState->Control.PackageEnd;
|
|
|
|
/* Return status depending on opcode */
|
|
|
|
if (Op->Common.AmlOpcode == AML_BREAK_OP)
|
|
{
|
|
Status = AE_CTRL_BREAK;
|
|
}
|
|
else
|
|
{
|
|
Status = AE_CTRL_CONTINUE;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
|
|
ACPI_ERROR ((AE_INFO, "Unknown control opcode=0x%X Op=%p",
|
|
Op->Common.AmlOpcode, Op));
|
|
|
|
Status = AE_AML_BAD_OPCODE;
|
|
break;
|
|
}
|
|
|
|
return (Status);
|
|
}
|