497 lines
17 KiB
C
497 lines
17 KiB
C
/******************************************************************************
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*
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* Module Name: dscontrol - Support for execution control opcodes -
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* if/else/while/return
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*
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*****************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#define __DSCONTROL_C__
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#include "acpi.h"
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#include "accommon.h"
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#include "amlcode.h"
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#include "acdispat.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_DISPATCHER
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ACPI_MODULE_NAME ("dscontrol")
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/*******************************************************************************
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*
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* FUNCTION: AcpiDsExecBeginControlOp
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*
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* PARAMETERS: WalkList - The list that owns the walk stack
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* Op - The control Op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Handles all control ops encountered during control method
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* execution.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiDsExecBeginControlOp (
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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_STATUS Status = AE_OK;
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ACPI_GENERIC_STATE *ControlState;
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ACPI_FUNCTION_NAME (DsExecBeginControlOp);
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
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Op, Op->Common.AmlOpcode, WalkState));
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switch (Op->Common.AmlOpcode)
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{
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case AML_WHILE_OP:
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/*
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* If this is an additional iteration of a while loop, continue.
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* There is no need to allocate a new control state.
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*/
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if (WalkState->ControlState)
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{
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if (WalkState->ControlState->Control.AmlPredicateStart ==
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(WalkState->ParserState.Aml - 1))
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{
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/* Reset the state to start-of-loop */
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WalkState->ControlState->Common.State =
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ACPI_CONTROL_CONDITIONAL_EXECUTING;
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break;
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}
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}
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/*lint -fallthrough */
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case AML_IF_OP:
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/*
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* IF/WHILE: Create a new control state to manage these
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* constructs. We need to manage these as a stack, in order
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* to handle nesting.
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*/
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ControlState = AcpiUtCreateControlState ();
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if (!ControlState)
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{
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Status = AE_NO_MEMORY;
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break;
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}
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/*
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* Save a pointer to the predicate for multiple executions
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* of a loop
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*/
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ControlState->Control.AmlPredicateStart = WalkState->ParserState.Aml - 1;
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ControlState->Control.PackageEnd = WalkState->ParserState.PkgEnd;
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ControlState->Control.Opcode = Op->Common.AmlOpcode;
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/* Push the control state on this walk's control stack */
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AcpiUtPushGenericState (&WalkState->ControlState, ControlState);
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break;
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case AML_ELSE_OP:
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/* Predicate is in the state object */
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/* If predicate is true, the IF was executed, ignore ELSE part */
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if (WalkState->LastPredicate)
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{
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Status = AE_CTRL_TRUE;
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}
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break;
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case AML_RETURN_OP:
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break;
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default:
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break;
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}
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return (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiDsExecEndControlOp
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*
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* PARAMETERS: WalkList - The list that owns the walk stack
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* Op - The control Op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Handles all control ops encountered during control method
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* execution.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiDsExecEndControlOp (
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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_STATUS Status = AE_OK;
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ACPI_GENERIC_STATE *ControlState;
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ACPI_FUNCTION_NAME (DsExecEndControlOp);
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switch (Op->Common.AmlOpcode)
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{
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case AML_IF_OP:
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", Op));
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/*
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* Save the result of the predicate in case there is an
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* ELSE to come
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*/
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WalkState->LastPredicate =
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(BOOLEAN) WalkState->ControlState->Common.Value;
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/*
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* Pop the control state that was created at the start
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* of the IF and free it
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*/
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ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
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AcpiUtDeleteGenericState (ControlState);
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break;
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case AML_ELSE_OP:
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break;
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case AML_WHILE_OP:
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", Op));
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ControlState = WalkState->ControlState;
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if (ControlState->Common.Value)
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{
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/* Predicate was true, the body of the loop was just executed */
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/*
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* This loop counter mechanism allows the interpreter to escape
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* possibly infinite loops. This can occur in poorly written AML
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* when the hardware does not respond within a while loop and the
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* loop does not implement a timeout.
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*/
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ControlState->Control.LoopCount++;
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if (ControlState->Control.LoopCount > ACPI_MAX_LOOP_ITERATIONS)
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{
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Status = AE_AML_INFINITE_LOOP;
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break;
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}
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/*
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* Go back and evaluate the predicate and maybe execute the loop
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* another time
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*/
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Status = AE_CTRL_PENDING;
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WalkState->AmlLastWhile = ControlState->Control.AmlPredicateStart;
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break;
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}
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/* Predicate was false, terminate this while loop */
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
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"[WHILE_OP] termination! Op=%p\n",Op));
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/* Pop this control state and free it */
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ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
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AcpiUtDeleteGenericState (ControlState);
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break;
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case AML_RETURN_OP:
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
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"[RETURN_OP] Op=%p Arg=%p\n",Op, Op->Common.Value.Arg));
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/*
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* One optional operand -- the return value
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* It can be either an immediate operand or a result that
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* has been bubbled up the tree
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*/
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if (Op->Common.Value.Arg)
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{
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/* Since we have a real Return(), delete any implicit return */
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AcpiDsClearImplicitReturn (WalkState);
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/* Return statement has an immediate operand */
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Status = AcpiDsCreateOperands (WalkState, Op->Common.Value.Arg);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/*
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* If value being returned is a Reference (such as
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* an arg or local), resolve it now because it may
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* cease to exist at the end of the method.
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*/
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Status = AcpiExResolveToValue (&WalkState->Operands [0], WalkState);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/*
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* Get the return value and save as the last result
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* value. This is the only place where WalkState->ReturnDesc
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* is set to anything other than zero!
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*/
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WalkState->ReturnDesc = WalkState->Operands[0];
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}
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else if (WalkState->ResultCount)
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{
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/* Since we have a real Return(), delete any implicit return */
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AcpiDsClearImplicitReturn (WalkState);
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/*
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* The return value has come from a previous calculation.
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*
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* If value being returned is a Reference (such as
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* an arg or local), resolve it now because it may
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* cease to exist at the end of the method.
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*
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* Allow references created by the Index operator to return
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* unchanged.
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*/
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if ((ACPI_GET_DESCRIPTOR_TYPE (WalkState->Results->Results.ObjDesc[0]) == ACPI_DESC_TYPE_OPERAND) &&
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((WalkState->Results->Results.ObjDesc [0])->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
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((WalkState->Results->Results.ObjDesc [0])->Reference.Class != ACPI_REFCLASS_INDEX))
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{
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Status = AcpiExResolveToValue (&WalkState->Results->Results.ObjDesc [0], WalkState);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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}
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WalkState->ReturnDesc = WalkState->Results->Results.ObjDesc [0];
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}
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else
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{
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/* No return operand */
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if (WalkState->NumOperands)
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{
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AcpiUtRemoveReference (WalkState->Operands [0]);
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}
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WalkState->Operands [0] = NULL;
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WalkState->NumOperands = 0;
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WalkState->ReturnDesc = NULL;
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
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"Completed RETURN_OP State=%p, RetVal=%p\n",
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WalkState, WalkState->ReturnDesc));
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/* End the control method execution right now */
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Status = AE_CTRL_TERMINATE;
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break;
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case AML_NOOP_OP:
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/* Just do nothing! */
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break;
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case AML_BREAK_POINT_OP:
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/*
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* Set the single-step flag. This will cause the debugger (if present)
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* to break to the console within the AML debugger at the start of the
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* next AML instruction.
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*/
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ACPI_DEBUGGER_EXEC (
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AcpiGbl_CmSingleStep = TRUE);
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ACPI_DEBUGGER_EXEC (
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AcpiOsPrintf ("**break** Executed AML BreakPoint opcode\n"));
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/* Call to the OSL in case OS wants a piece of the action */
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Status = AcpiOsSignal (ACPI_SIGNAL_BREAKPOINT,
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"Executed AML Breakpoint opcode");
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break;
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case AML_BREAK_OP:
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case AML_CONTINUE_OP: /* ACPI 2.0 */
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/* Pop and delete control states until we find a while */
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while (WalkState->ControlState &&
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(WalkState->ControlState->Control.Opcode != AML_WHILE_OP))
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{
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ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
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AcpiUtDeleteGenericState (ControlState);
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}
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/* No while found? */
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if (!WalkState->ControlState)
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{
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return (AE_AML_NO_WHILE);
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}
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/* Was: WalkState->AmlLastWhile = WalkState->ControlState->Control.AmlPredicateStart; */
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WalkState->AmlLastWhile = WalkState->ControlState->Control.PackageEnd;
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/* Return status depending on opcode */
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if (Op->Common.AmlOpcode == AML_BREAK_OP)
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{
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Status = AE_CTRL_BREAK;
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}
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else
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{
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Status = AE_CTRL_CONTINUE;
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}
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break;
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default:
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ACPI_ERROR ((AE_INFO, "Unknown control opcode=0x%X Op=%p",
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Op->Common.AmlOpcode, Op));
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Status = AE_AML_BAD_OPCODE;
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break;
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}
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return (Status);
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}
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