/*

* 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 SymbianStackAlgorithmAccurate.Instructions;

using SymbianStructuresLib.Arm.Registers;

using SymbianStructuresLib.Arm;

namespace SymbianStackAlgorithmAccurate.CPU

{

    public class ArmCpu

    {

        #region Constructors

        public ArmCpu()

        {

        }

        #endregion

        #region API

        #endregion

        #region Properties

        public ArmRegisterCollection Registers

        {

            get { return iRegisters; }

            set

            { 

                // Copy the registers, don't take a reference to the supplied ones..

                // Otherwise we cannot invoke stack walking twice since we blatted

                // the original (external) copy.

                ArmRegisterCollection regs = new ArmRegisterCollection( value );

                iRegisters = regs;

            }

        }

        public ArmRegister SP

        {

            get

            {

                ArmRegister ret = Registers[ TArmRegisterType.EArmReg_SP ];

                return ret;

            }

        }

        public ArmRegister LR

        {

            get

            {

                ArmRegister ret = Registers[ TArmRegisterType.EArmReg_LR ];

                return ret;

            }

        }

        public ArmRegister PC

        {

            get

            {

                ArmRegister ret = Registers[ TArmRegisterType.EArmReg_PC ];

                return ret;

            }

        }

        public ArmRegister CPSR

        {

            get

            {

                ArmRegister ret = Registers[ TArmRegisterType.EArmReg_CPSR ];

                return ret;

            }

        }

        public TArmInstructionSet CurrentProcessorMode

        {

            get

            {

                TArmInstructionSet ret = TArmInstructionSet.EARM;

                ArmRegister cpsr = CPSR;

                //

                if ( ( cpsr.Value & 0x20 ) != 0 )

                {

                    ret = TArmInstructionSet.ETHUMB;

                }

                //

                return ret;

            }

            set

            {

                if ( value == TArmInstructionSet.EARM )

                {

                    // Clear CPSR Thumb bit

                    CPSR.Value &= 0xFFFFFFDF;

                }

                else if ( value == TArmInstructionSet.ETHUMB )

                {

                    // Set CPSR Thumb bit

                    CPSR.Value |= 0x00000020;

                }

            }

        }

        public ArmRegister this[ TArmRegisterType aType ]

        {

            get { return iRegisters[ aType ]; }

        }

        #endregion

        #region Data members

        private ArmRegisterCollection iRegisters = new ArmRegisterCollection();

        #endregion

    }

}