ACPI_STATUS
AcpiDsExecEndOp (
ACPI_WALK_STATE *WalkState)
{
ACPI_PARSE_OBJECT *Op;
ACPI_STATUS Status = AE_OK;
UINT32 OpType;
UINT32 OpClass;
ACPI_PARSE_OBJECT *NextOp;
ACPI_PARSE_OBJECT *FirstArg;
ACPI_FUNCTION_TRACE_PTR (DsExecEndOp, WalkState);
Op = WalkState->Op;
OpType = WalkState->OpInfo->Type;
OpClass = WalkState->OpInfo->Class;
if (OpClass == AML_CLASS_UNKNOWN)
{
ACPI_ERROR ((AE_INFO, "Unknown opcode 0x%X", Op->Common.AmlOpcode));
return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
}
FirstArg = Op->Common.Value.Arg;
/* Init the walk state */
WalkState->NumOperands = 0;
WalkState->OperandIndex = 0;
WalkState->ReturnDesc = NULL;
WalkState->ResultObj = NULL;
/* Call debugger for single step support (DEBUG build only) */
Status = AcpiDbSingleStep (WalkState, Op, OpClass);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Decode the Opcode Class */
switch (OpClass)
{
case AML_CLASS_ARGUMENT: /* Constants, literals, etc. */
if (WalkState->Opcode == AML_INT_NAMEPATH_OP)
{
Status = AcpiDsEvaluateNamePath (WalkState);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
}
break;
case AML_CLASS_EXECUTE: /* Most operators with arguments */
/* Build resolved operand stack */
Status = AcpiDsCreateOperands (WalkState, FirstArg);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/*
* All opcodes require operand resolution, with the only exceptions
* being the ObjectType and SizeOf operators.
*/
if (!(WalkState->OpInfo->Flags & AML_NO_OPERAND_RESOLVE))
{
/* Resolve all operands */
Status = AcpiExResolveOperands (WalkState->Opcode,
&(WalkState->Operands [WalkState->NumOperands -1]),
WalkState);
}
if (ACPI_SUCCESS (Status))
{
/*
* Dispatch the request to the appropriate interpreter handler
* routine. There is one routine per opcode "type" based upon the
* number of opcode arguments and return type.
*/
Status = AcpiGbl_OpTypeDispatch[OpType] (WalkState);
}
else
{
/*
* Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
* Local is uninitialized.
*/
if ((Status == AE_AML_UNINITIALIZED_LOCAL) &&
(WalkState->Opcode == AML_STORE_OP) &&
(WalkState->Operands[0]->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
(WalkState->Operands[1]->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
(WalkState->Operands[0]->Reference.Class ==
WalkState->Operands[1]->Reference.Class) &&
(WalkState->Operands[0]->Reference.Value ==
WalkState->Operands[1]->Reference.Value))
{
Status = AE_OK;
}
else
{
ACPI_EXCEPTION ((AE_INFO, Status,
"While resolving operands for [%s]",
AcpiPsGetOpcodeName (WalkState->Opcode)));
}
}
/* Always delete the argument objects and clear the operand stack */
AcpiDsClearOperands (WalkState);
/*
* If a result object was returned from above, push it on the
* current result stack
*/
if (ACPI_SUCCESS (Status) &&
WalkState->ResultObj)
{
Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
}
break;
default:
switch (OpType)
{
case AML_TYPE_CONTROL: /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
/* 1 Operand, 0 ExternalResult, 0 InternalResult */
Status = AcpiDsExecEndControlOp (WalkState, Op);
break;
case AML_TYPE_METHOD_CALL:
/*
* If the method is referenced from within a package
* declaration, it is not a invocation of the method, just
* a reference to it.
*/
if ((Op->Asl.Parent) &&
((Op->Asl.Parent->Asl.AmlOpcode == AML_PACKAGE_OP) ||
(Op->Asl.Parent->Asl.AmlOpcode == AML_VAR_PACKAGE_OP)))
{
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
"Method Reference in a Package, Op=%p\n", Op));
Op->Common.Node = (ACPI_NAMESPACE_NODE *)
Op->Asl.Value.Arg->Asl.Node;
AcpiUtAddReference (Op->Asl.Value.Arg->Asl.Node->Object);
return_ACPI_STATUS (AE_OK);
}
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
"Method invocation, Op=%p\n", Op));
/*
* (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
* the method Node pointer
*/
/* NextOp points to the op that holds the method name */
NextOp = FirstArg;
/* NextOp points to first argument op */
NextOp = NextOp->Common.Next;
/*
* Get the method's arguments and put them on the operand stack
*/
Status = AcpiDsCreateOperands (WalkState, NextOp);
if (ACPI_FAILURE (Status))
{
break;
}
/*
* Since the operands will be passed to another control method,
* we must resolve all local references here (Local variables,
* arguments to *this* method, etc.)
*/
Status = AcpiDsResolveOperands (WalkState);
if (ACPI_FAILURE (Status))
{
/* On error, clear all resolved operands */
AcpiDsClearOperands (WalkState);
break;
}
/*
* Tell the walk loop to preempt this running method and
* execute the new method
*/
Status = AE_CTRL_TRANSFER;
/*
* Return now; we don't want to disturb anything,
* especially the operand count!
*/
return_ACPI_STATUS (Status);
case AML_TYPE_CREATE_FIELD:
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Executing CreateField Buffer/Index Op=%p\n", Op));
Status = AcpiDsLoad2EndOp (WalkState);
if (ACPI_FAILURE (Status))
{
break;
}
Status = AcpiDsEvalBufferFieldOperands (WalkState, Op);
break;
case AML_TYPE_CREATE_OBJECT:
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Executing CreateObject (Buffer/Package) Op=%p\n", Op));
switch (Op->Common.Parent->Common.AmlOpcode)
{
case AML_NAME_OP:
/*
* Put the Node on the object stack (Contains the ACPI Name
* of this object)
*/
WalkState->Operands[0] = (void *)
Op->Common.Parent->Common.Node;
WalkState->NumOperands = 1;
Status = AcpiDsCreateNode (WalkState,
Op->Common.Parent->Common.Node, Op->Common.Parent);
if (ACPI_FAILURE (Status))
{
break;
}
/* Fall through */
/*lint -fallthrough */
case AML_INT_EVAL_SUBTREE_OP:
Status = AcpiDsEvalDataObjectOperands (WalkState, Op,
AcpiNsGetAttachedObject (Op->Common.Parent->Common.Node));
break;
default:
Status = AcpiDsEvalDataObjectOperands (WalkState, Op, NULL);
break;
}
/*
* If a result object was returned from above, push it on the
* current result stack
*/
if (WalkState->ResultObj)
{
Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
}
break;
case AML_TYPE_NAMED_FIELD:
case AML_TYPE_NAMED_COMPLEX:
case AML_TYPE_NAMED_SIMPLE:
case AML_TYPE_NAMED_NO_OBJ:
Status = AcpiDsLoad2EndOp (WalkState);
if (ACPI_FAILURE (Status))
{
break;
}
if (Op->Common.AmlOpcode == AML_REGION_OP)
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Executing OpRegion Address/Length Op=%p\n", Op));
Status = AcpiDsEvalRegionOperands (WalkState, Op);
if (ACPI_FAILURE (Status))
{
break;
}
}
else if (Op->Common.AmlOpcode == AML_DATA_REGION_OP)
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Executing DataTableRegion Strings Op=%p\n", Op));
Status = AcpiDsEvalTableRegionOperands (WalkState, Op);
if (ACPI_FAILURE (Status))
{
break;
}
}
else if (Op->Common.AmlOpcode == AML_BANK_FIELD_OP)
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Executing BankField Op=%p\n", Op));
Status = AcpiDsEvalBankFieldOperands (WalkState, Op);
if (ACPI_FAILURE (Status))
{
break;
}
}
break;
case AML_TYPE_UNDEFINED:
ACPI_ERROR ((AE_INFO,
"Undefined opcode type Op=%p", Op));
return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
case AML_TYPE_BOGUS:
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
"Internal opcode=%X type Op=%p\n",
WalkState->Opcode, Op));
break;
default:
ACPI_ERROR ((AE_INFO,
"Unimplemented opcode, class=0x%X "
"type=0x%X Opcode=0x%X Op=%p",
OpClass, OpType, Op->Common.AmlOpcode, Op));
Status = AE_NOT_IMPLEMENTED;
break;
}
}
/*
* ACPI 2.0 support for 64-bit integers: Truncate numeric
* result value if we are executing from a 32-bit ACPI table
*/
(void) AcpiExTruncateFor32bitTable (WalkState->ResultObj);
/*
* Check if we just completed the evaluation of a
* conditional predicate
*/
if ((ACPI_SUCCESS (Status)) &&
(WalkState->ControlState) &&
(WalkState->ControlState->Common.State ==
ACPI_CONTROL_PREDICATE_EXECUTING) &&
(WalkState->ControlState->Control.PredicateOp == Op))
{
Status = AcpiDsGetPredicateValue (WalkState, WalkState->ResultObj);
WalkState->ResultObj = NULL;
}
Cleanup:
if (WalkState->ResultObj)
{
/* Break to debugger to display result */
AcpiDbDisplayResultObject (WalkState->ResultObj,WalkState);
/*
* Delete the result op if and only if:
* Parent will not use the result -- such as any
* non-nested type2 op in a method (parent will be method)
*/
AcpiDsDeleteResultIfNotUsed (Op, WalkState->ResultObj, WalkState);
}
#ifdef _UNDER_DEVELOPMENT
if (WalkState->ParserState.Aml == WalkState->ParserState.AmlEnd)
{
AcpiDbMethodEnd (WalkState);
}
#endif
/* Invoke exception handler on error */
if (ACPI_FAILURE (Status))
{
Status = AcpiDsMethodError (Status, WalkState);
}
/* Always clear the object stack */
WalkState->NumOperands = 0;
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiPsParseAml (
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status;
ACPI_THREAD_STATE *Thread;
ACPI_THREAD_STATE *PrevWalkList = AcpiGbl_CurrentWalkList;
ACPI_WALK_STATE *PreviousWalkState;
ACPI_FUNCTION_TRACE (PsParseAml);
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Entered with WalkState=%p Aml=%p size=%X\n",
WalkState, WalkState->ParserState.Aml,
WalkState->ParserState.AmlSize));
if (!WalkState->ParserState.Aml)
{
return_ACPI_STATUS (AE_NULL_OBJECT);
}
/* Create and initialize a new thread state */
Thread = AcpiUtCreateThreadState ();
if (!Thread)
{
if (WalkState->MethodDesc)
{
/* Executing a control method - additional cleanup */
AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
}
AcpiDsDeleteWalkState (WalkState);
return_ACPI_STATUS (AE_NO_MEMORY);
}
WalkState->Thread = Thread;
/*
* If executing a method, the starting SyncLevel is this method's
* SyncLevel
*/
if (WalkState->MethodDesc)
{
WalkState->Thread->CurrentSyncLevel = WalkState->MethodDesc->Method.SyncLevel;
}
AcpiDsPushWalkState (WalkState, Thread);
/*
* This global allows the AML debugger to get a handle to the currently
* executing control method.
*/
AcpiGbl_CurrentWalkList = Thread;
/*
* Execute the walk loop as long as there is a valid Walk State. This
* handles nested control method invocations without recursion.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", WalkState));
Status = AE_OK;
while (WalkState)
{
if (ACPI_SUCCESS (Status))
{
/*
* The ParseLoop executes AML until the method terminates
* or calls another method.
*/
Status = AcpiPsParseLoop (WalkState);
}
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Completed one call to walk loop, %s State=%p\n",
AcpiFormatException (Status), WalkState));
if (Status == AE_CTRL_TRANSFER)
{
/*
* A method call was detected.
* Transfer control to the called control method
*/
Status = AcpiDsCallControlMethod (Thread, WalkState, NULL);
if (ACPI_FAILURE (Status))
{
Status = AcpiDsMethodError (Status, WalkState);
}
/*
* If the transfer to the new method method call worked, a new walk
* state was created -- get it
*/
WalkState = AcpiDsGetCurrentWalkState (Thread);
continue;
}
else if (Status == AE_CTRL_TERMINATE)
{
Status = AE_OK;
}
else if ((Status != AE_OK) && (WalkState->MethodDesc))
{
/* Either the method parse or actual execution failed */
ACPI_ERROR_METHOD ("Method parse/execution failed",
WalkState->MethodNode, NULL, Status);
/* Check for possible multi-thread reentrancy problem */
if ((Status == AE_ALREADY_EXISTS) &&
(!(WalkState->MethodDesc->Method.InfoFlags & ACPI_METHOD_SERIALIZED)))
{
/*
* Method is not serialized and tried to create an object
* twice. The probable cause is that the method cannot
* handle reentrancy. Mark as "pending serialized" now, and
* then mark "serialized" when the last thread exits.
*/
WalkState->MethodDesc->Method.InfoFlags |=
ACPI_METHOD_SERIALIZED_PENDING;
}
}
/* We are done with this walk, move on to the parent if any */
WalkState = AcpiDsPopWalkState (Thread);
/* Reset the current scope to the beginning of scope stack */
AcpiDsScopeStackClear (WalkState);
/*
* If we just returned from the execution of a control method or if we
* encountered an error during the method parse phase, there's lots of
* cleanup to do
*/
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);
}
ACPI_STATUS
AcpiDsExecBeginOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT **OutOp)
{
ACPI_PARSE_OBJECT *Op;
ACPI_STATUS Status = AE_OK;
UINT32 OpcodeClass;
ACPI_FUNCTION_TRACE_PTR (DsExecBeginOp, WalkState);
Op = WalkState->Op;
if (!Op)
{
Status = AcpiDsLoad2BeginOp (WalkState, OutOp);
if (ACPI_FAILURE (Status))
{
goto ErrorExit;
}
Op = *OutOp;
WalkState->Op = Op;
WalkState->Opcode = Op->Common.AmlOpcode;
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
if (AcpiNsOpensScope (WalkState->OpInfo->ObjectType))
{
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
"(%s) Popping scope for Op %p\n",
AcpiUtGetTypeName (WalkState->OpInfo->ObjectType), Op));
Status = AcpiDsScopeStackPop (WalkState);
if (ACPI_FAILURE (Status))
{
goto ErrorExit;
}
}
}
if (Op == WalkState->Origin)
{
if (OutOp)
{
*OutOp = Op;
}
return_ACPI_STATUS (AE_OK);
}
/*
* If the previous opcode was a conditional, this opcode
* must be the beginning of the associated predicate.
* Save this knowledge in the current scope descriptor
*/
if ((WalkState->ControlState) &&
(WalkState->ControlState->Common.State ==
ACPI_CONTROL_CONDITIONAL_EXECUTING))
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Exec predicate Op=%p State=%p\n",
Op, WalkState));
WalkState->ControlState->Common.State =
ACPI_CONTROL_PREDICATE_EXECUTING;
/* Save start of predicate */
WalkState->ControlState->Control.PredicateOp = Op;
}
OpcodeClass = WalkState->OpInfo->Class;
/* We want to send namepaths to the load code */
if (Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP)
{
OpcodeClass = AML_CLASS_NAMED_OBJECT;
}
/*
* Handle the opcode based upon the opcode type
*/
switch (OpcodeClass)
{
case AML_CLASS_CONTROL:
Status = AcpiDsExecBeginControlOp (WalkState, Op);
break;
case AML_CLASS_NAMED_OBJECT:
if (WalkState->WalkType & ACPI_WALK_METHOD)
{
/*
* Found a named object declaration during method execution;
* we must enter this object into the namespace. The created
* object is temporary and will be deleted upon completion of
* the execution of this method.
*
* Note 10/2010: Except for the Scope() op. This opcode does
* not actually create a new object, it refers to an existing
* object. However, for Scope(), we want to indeed open a
* new scope.
*/
if (Op->Common.AmlOpcode != AML_SCOPE_OP)
{
Status = AcpiDsLoad2BeginOp (WalkState, NULL);
}
else
{
Status = AcpiDsScopeStackPush (
Op->Named.Node, Op->Named.Node->Type, WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
}
break;
case AML_CLASS_EXECUTE:
case AML_CLASS_CREATE:
break;
default:
break;
}
/* Nothing to do here during method execution */
return_ACPI_STATUS (Status);
ErrorExit:
Status = AcpiDsMethodError (Status, WalkState);
return_ACPI_STATUS (Status);
}
