/*

* 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 System.Text.RegularExpressions;

using System.IO;

using SymbianStructuresLib.Arm.Registers;

namespace SymbianInstructionLib.Arm.Instructions.Common

{

    internal static class ArmInstructionUtils

    {

        public static int SignExtend24BitTo32Bit( uint aImmediate )

        {

            int offset;

            //

            unchecked

            {

                if ( ( aImmediate & 0x00800000 ) == 0x00800000 )

                {

                    offset = (int) ( 0xff000000 | aImmediate );

                }

                else

                {

                    offset = (int) aImmediate;

                }

            }

            //

            offset <<= 2;

            offset += 8; // pipeline

            return offset;

        }

        public static List<TArmRegisterType> ExtractGPRegisterList( uint aEncodedList )

        {

            List<TArmRegisterType> ret = new List<TArmRegisterType>();

            //

            for ( int i = 15; i >= 0; i-- )

            {

                uint mask = (uint) ( 1 << i );

                if ( ( aEncodedList & mask ) == mask )

                {

                    ret.Add( (TArmRegisterType) i );

                }

            }

            //

            return ret;

        }

    }

    internal static class ThumbInstructionUtils

    {

        public static int SignExtend11BitTo32Bit( uint aImmediate )

        {

            int offset = SignExtend11BitTo32Bit( aImmediate, 1 );

            offset += 4; // pipeline

            return offset;

        }

        public static int SignExtend11BitTo32Bit( uint aImmediate, int aLeftShiftCount )

        {

            int offset;

            //

            unchecked

            {

                //  10  9  8  7  6  5  4  3  2  1  0

                // ----------------------------------

                //   1  0  0  0  0  0  0  0  0  0  0

                if ( ( aImmediate & 0x00000400 ) == 0x00000400 )

                {

                    // 11111111111111111111100000000000

                    //                      10000000000

                    offset = (int) ( 0xFFFFF800 | aImmediate );

                }

                else

                {

                    offset = (int) aImmediate;

                }

            }

            //

            offset <<= aLeftShiftCount;

            return offset;

        }

        public static int SignExtend8BitTo32Bit( uint aImmediate )

        {

            int offset;

            //

            unchecked

            {

                //  7  6  5  4  3  2  1  0

                // ------------------------

                //  1  0  0  0  0  0  0  0

                if ( ( aImmediate & 0x00000080 ) == 0x00000080 )

                {

                    // 11111111111111111111111100000000

                    //                         10000000

                    offset = (int) ( 0xFFFFFF00 | aImmediate );

                }

                else

                {

                    offset = (int) aImmediate;

                }

            }

            //

            offset <<= 1;

            offset += 4; // pipeline

            return offset;

        }

    }

}