/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

* 

* Description:

*

*/

using System;

using System.Collections.Generic;

using System.Text;

using SymbianUtils.BasicTypes;

using SymbianStructuresLib.Arm.Registers;

using SymbianStructuresLib.Arm.Instructions;

using SymbianInstructionLib.Arm.Instructions.Common;

namespace SymbianInstructionLib.Arm.Instructions.Thumb.DataProcessing

{

    [ArmRef( "A7.1.9 ADD (7)",  "ADD SP, #<immed_7> * 4" )]

    [ArmRef( "A7.1.68 SUB (4)", "SUB SP, #<immed_7> * 4" )]

    public class Thumb_AddOrSubtract_SP : Thumb_AddOrSubtract

    {

        #region Constructors

        public Thumb_AddOrSubtract_SP()

        {

            //                         Type   immed_7

            base.SetMask( "10110000" + "#" + "#######" );

        }

        #endregion

        #region From ArmBaseInstruction

        protected override bool DoQueryInvolvementAsSource( TArmRegisterType aRegister )

        {

            // SP acts as source & destination

            return ( aRegister == TArmRegisterType.EArmReg_SP );

        }

        #endregion

        #region From Thumb_AddOrSubtract

        public override TArmDataProcessingType OperationType

        {

            get

            {

                TArmDataProcessingType ret = TArmDataProcessingType.ADD;

                //

                if ( base.AIRawValue[ 7 ] == SymBit.ESet )

                {

                    ret = TArmDataProcessingType.SUB;

                }

                //

                return ret;

            }

        }

        #endregion

        #region Properties

        public override uint Immediate

        {

            get

            {

                uint rawValue = ( base.AIRawValue & 0x7F );

                uint ret = rawValue * 4;

                return ret;

            }

        }

        public override bool SuppliesImmediate

        {

            get { return true; }

        }

        public override TArmRegisterType Rd

        {

            get { return TArmRegisterType.EArmReg_SP; }

        }

        #endregion

        #region Internal methods

        #endregion

        #region Data members

        private static readonly SymMask KMaskRn = new SymMask( 0x38, SymMask.TShiftDirection.ERight, 3 );

        private static readonly SymMask KMaskRd = new SymMask( 0x7 );

        #endregion

    }

}