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Cosmos/source/Indy.IL2CPU/Assembler/x86/_Infra/Instruction.cs
mterwoord_cp cf8b010c2d
2008-11-16 16:09:15 +00:00

697 lines
39 KiB
C#
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Reflection;
namespace Indy.IL2CPU.Assembler.X86 {
// todo: cache the EncodingOption and InstructionData instances..
public abstract class Instruction : Indy.IL2CPU.Assembler.Instruction {
[Flags]
public enum InstructionSizes {
None,
Byte=8,
Word=16,
DWord=32,
QWord = 64,
}
public enum InstructionSize {
None = 0,
Byte = 8,
Word = 16,
DWord = 32,
QWord = 64,
}
public class InstructionData {
public class InstructionEncodingOption {
public Action<byte[], Instruction> ModifyBytes;
public byte[] OpCode;
/// <summary>
/// If ModR/M byte needed, set to true. If true, all other fields on <see cref="InstructionEncodingOption"/>
/// which refer to <see cref="OpCode"/> bytes, can assume an extra ModRM byte.
/// </summary>
public bool NeedsModRMByte;
public byte InitialModRMByteValue;
public InstructionSizes AllowedSizes;
public InstructionSize DefaultSize = InstructionSize.DWord;
/// <summary>
/// the indx in OpCode where the OperandSize bit is encoded
/// </summary>
public byte? OperandSizeByte;
/// <summary>
/// the amount of bits the operandsize bit gets shifted to left, if neccessary
/// </summary>
public byte OperandSizeBitShiftLeft;
/// <summary>
/// is this EncodingOption valid for situations where the Destination is a register?
/// if so, DestinationReg == Guid.Empty. if it is specific to a given register, the 32bit id is put in DestinationReg
/// </summary>
public Guid? DestinationReg;
/// <summary>
/// the index in OpCode where the DestinationReg bit is encoded
/// </summary>
public byte? DestinationRegByte;
/// <summary>
/// the amount of bits the DestinationReg bits gets shifted to left, if neccessary
/// </summary>
public byte DestinationRegBitShiftLeft;
/// <summary>
/// is this EncodingOption valid for situations where the Destination operand is memory?
/// </summary>
public bool DestinationMemory;
/// <summary>
/// is this EncodingOption valid for situations where the Destination is an immediate value
/// </summary>
public bool DestinationImmediate;
/// <summary>
/// is this EncodingOption valid for situations where the Source is a register?
/// if so, SourceReg == Guid.Empty. if it is specific to a given register, the 32bit id is put in SourceReg
/// </summary>
public Guid? SourceReg;
/// <summary>
/// the index in OpCode where the SourceReg bit is encoded
/// </summary>
public byte? SourceRegByte;
/// <summary>
/// the amount of bits the SourceReg bits gets shifted to left, if necessary
/// </summary>
public byte SourceRegBitShiftLeft;
/// <summary>
/// is this EncodingOption valid for situations where the Source operand is memory?
/// </summary>
public bool SourceMemory;
/// <summary>
/// is this EncodingOption valid for situations where the Source is an immediate value
/// </summary>
public bool SourceImmediate;
}
public bool HasDestinationOperand;
public bool HasSourceOperand;
/// <summary>
/// True if by default large (32bit), false if small (16bit)
/// </summary>
//public InstructionSize DefaultSize = InstructionSize.DWord;
public List<InstructionEncodingOption> EncodingOptions = new List<InstructionEncodingOption>();
}
private static SortedList<Type, InstructionData> mInstructionDatas;
private static ReaderWriterLocker mInstructionDatasLocker;
static Instruction() {
mInstructionDatasLocker = new ReaderWriterLocker();
using (mInstructionDatasLocker.AcquireWriterLock()) {
mInstructionDatas = new SortedList<Type, InstructionData>(new TypeComparer());
foreach (Type xType in typeof(Instruction).Assembly.GetTypes()) {
if (!xType.IsSubclassOf(typeof(Instruction))) {
continue;
}
if (!xType.Namespace.StartsWith(typeof(Instruction).Namespace)) {
continue;
}
if (xType.IsAbstract) {
continue;
}
var xAttrib = xType.GetCustomAttributes(typeof(OpCodeAttribute), true).FirstOrDefault() as OpCodeAttribute;
if (xAttrib == null) {
continue;
}
var xNewInstructionData = new InstructionData();
mInstructionDatas.Add(xType, xNewInstructionData);
if (xType.IsSubclassOf(typeof(InstructionWithDestination))) {
xNewInstructionData.HasDestinationOperand = true;
}
if (xType.IsSubclassOf(typeof(InstructionWithDestinationAndSource))) {
xNewInstructionData.HasDestinationOperand = true;
xNewInstructionData.HasSourceOperand = true;
}
var xMethod = xType.GetMethod("InitializeEncodingData", new Type[] { typeof(InstructionData) });
if (xMethod != null) {
xMethod.Invoke(null, new object[] { xNewInstructionData });
}
}
}
}
protected Instruction() {
}
protected static string SizeToString(byte aSize) {
switch (aSize) {
case 8:
return "byte";
case 16:
return "word";
case 32:
return "dword";
case 64:
return "qword";
default:
throw new Exception("Invalid size: " + aSize);
}
}
private static bool GetEffectiveInstructionInfo(Instruction aInstruction, IInstructionWithDestination aInstructionWithDestination, IInstructionWithSize aInstructionWithSize, IInstructionWithSource aInstructionWithSource, out InstructionData aInstructionData, out InstructionData.InstructionEncodingOption aEncodingOption) {
using (mInstructionDatasLocker.AcquireReaderLock()) {
mInstructionDatas.TryGetValue(aInstruction.GetType(), out aInstructionData);
}
if (aInstructionData == null) {
aEncodingOption = null;
return false;
}
aEncodingOption = null;
for (int i = 0; i < aInstructionData.EncodingOptions.Count; i++) {
var xEncodingOption = aInstructionData.EncodingOptions[i];
if (aInstructionWithDestination != null) {
if (!(((xEncodingOption.DestinationMemory || xEncodingOption.DestinationReg.HasValue) && (aInstructionWithDestination.DestinationReg != Guid.Empty || aInstructionWithDestination.DestinationValue.HasValue)) ||
(!(xEncodingOption.DestinationMemory || xEncodingOption.DestinationReg.HasValue) && aInstructionWithDestination.DestinationReg == Guid.Empty && aInstructionWithDestination.DestinationValue.HasValue))) {
// mismatch
continue;
}
if ((!((xEncodingOption.DestinationMemory && (aInstructionWithDestination.DestinationValue != null && aInstructionWithDestination.DestinationIsIndirect)) ||
(!xEncodingOption.DestinationMemory && (aInstructionWithDestination.DestinationValue == null && !aInstructionWithDestination.DestinationIsIndirect))) &&
!((xEncodingOption.DestinationMemory && (aInstructionWithDestination.DestinationReg != Guid.Empty && aInstructionWithDestination.DestinationIsIndirect)) ||
(!xEncodingOption.DestinationMemory && (aInstructionWithDestination.DestinationReg != Guid.Empty && !aInstructionWithDestination.DestinationIsIndirect)))) && aInstructionWithDestination.DestinationIsIndirect) {
continue;
}
if (!((xEncodingOption.DestinationImmediate && aInstructionWithDestination.DestinationValue != null && !aInstructionWithDestination.DestinationIsIndirect) ||
(!xEncodingOption.DestinationImmediate && (aInstructionWithDestination.DestinationValue == null || aInstructionWithDestination.DestinationIsIndirect)))) {
continue;
}
if (xEncodingOption.DestinationReg.HasValue && xEncodingOption.DestinationReg != Guid.Empty && aInstructionWithDestination.DestinationReg != Guid.Empty && aInstructionWithDestination.DestinationIsIndirect == xEncodingOption.DestinationMemory) {
if (xEncodingOption.DestinationReg != aInstructionWithDestination.DestinationReg) {
switch (xEncodingOption.DefaultSize) {
case InstructionSize.Byte: {
if ((xEncodingOption.AllowedSizes & InstructionSizes.Byte) != 0) {
var xTheActualReg = Registers.Get8BitRegistersForRegister(aInstructionWithDestination.DestinationReg);
if (xTheActualReg != xEncodingOption.DestinationReg.Value) {
continue;
}
}
break;
}
case InstructionSize.Word: {
if ((xEncodingOption.AllowedSizes & InstructionSizes.Word) != 0) {
var xTheActualReg = Registers.Get16BitRegisterForRegister(aInstructionWithDestination.DestinationReg);
if (xTheActualReg != xEncodingOption.DestinationReg.Value) {
continue;
}
}
break;
}
case InstructionSize.DWord: {
if ((xEncodingOption.AllowedSizes & InstructionSizes.DWord) != 0) {
var xTheActualReg = Registers.Get32BitRegisterForRegister(aInstructionWithDestination.DestinationReg);
if (xTheActualReg != xEncodingOption.DestinationReg.Value) {
continue;
}
}
break;
}
default:
throw new Exception("InstructionSize not implemented yet!");
}
}
}
}
if (aInstructionWithSource != null) {
if (!(((xEncodingOption.SourceMemory || xEncodingOption.SourceReg.HasValue) && (aInstructionWithSource.SourceReg != Guid.Empty || aInstructionWithSource.SourceValue.HasValue)) ||
(!(xEncodingOption.SourceMemory || xEncodingOption.SourceReg.HasValue) && aInstructionWithSource.SourceReg == Guid.Empty && aInstructionWithSource.SourceValue.HasValue))) {
// mismatch
continue;
}
if ((!((xEncodingOption.SourceMemory && (aInstructionWithSource.SourceValue != null && aInstructionWithSource.SourceIsIndirect)) ||
(!xEncodingOption.SourceMemory && (aInstructionWithSource.SourceValue == null && !aInstructionWithSource.SourceIsIndirect))) &&
!((xEncodingOption.SourceMemory && (aInstructionWithSource.SourceReg != Guid.Empty && aInstructionWithSource.SourceIsIndirect)) ||
(!xEncodingOption.SourceMemory && (aInstructionWithSource.SourceReg != Guid.Empty && !aInstructionWithSource.SourceIsIndirect)))) && aInstructionWithSource.SourceIsIndirect) {
continue;
}
if (!((xEncodingOption.SourceImmediate && aInstructionWithSource.SourceValue != null && !aInstructionWithSource.SourceIsIndirect) ||
(!xEncodingOption.SourceImmediate && (aInstructionWithSource.SourceValue == null || aInstructionWithSource.SourceIsIndirect)))) {
continue;
}
}
aEncodingOption = xEncodingOption;
break;
}
if (aEncodingOption == null) {
throw new Exception("No valid EncodingOption found!");
}
return true;
}
private static bool DetermineSize(Indy.IL2CPU.Assembler.Assembler aAssembler, out ulong aSize, Instruction aInstruction, IInstructionWithDestination aInstructionWithDestination, IInstructionWithSize aInstructionWithSize, IInstructionWithSource aInstructionWithSource, InstructionData aInstructionData, InstructionData.InstructionEncodingOption aEncodingOption) {
aSize = (ulong)aEncodingOption.OpCode.Length;
if (aEncodingOption.NeedsModRMByte) {
aSize += 1;
bool xSIB = false;
if (aInstructionWithDestination != null &&
((aInstructionWithDestination.DestinationReg == Registers.EBP && !(aInstructionWithDestination.DestinationIsIndirect && aInstructionWithDestination.DestinationDisplacement > 0)) ||
aInstructionWithDestination.DestinationReg == Registers.ESP)) {
aSize++;
xSIB = true;
} else {
//if (aInstructionWithSource != null &&
// ((aInstructionWithSource.SourceReg == Registers.EBP && !(aInstructionWithSource.SourceReg != Guid.Empty && aInstructionWithSource.SourceIsIndirect && aInstructionWithSource.SourceDisplacement > 0)) ||
// aInstructionWithSource.SourceReg == Registers.ESP)) {
// aSize++;
// xSIB = true;
//}
}
if (aInstructionWithDestination != null && aInstructionWithDestination.DestinationIsIndirect && aInstructionWithDestination.DestinationDisplacement > 0) {
if (aInstructionWithDestination.DestinationDisplacement < 256) {
aSize += 4; // for now use 16bit displacement
} else {
if (aInstructionWithDestination.DestinationDisplacement <= Int16.MaxValue) {
aSize += 4;
} else {
aSize += 4;
}
}
if (xSIB) {
// aSize -= 1;
}
}
}
if (aInstructionWithDestination != null && aInstructionWithSize != null) {
if (aInstructionWithDestination != null && aInstructionWithDestination.DestinationValue.HasValue) {
aSize += (ulong)aInstructionWithSize.Size / 8;
}
}
if (aInstructionWithDestination != null && aInstructionWithDestination.DestinationRef != null) {
aSize += 4;
}
if (aInstructionWithSource != null && aInstructionWithSource.SourceValue.HasValue) {
aSize += (ulong)aInstructionWithSize.Size / 8;
}
if (aInstructionWithSource != null && aInstructionWithSource.SourceRef != null) {
aSize += 4;
}
if (aInstructionWithDestination != null && (aInstructionWithDestination.DestinationValue.HasValue && !(aInstructionWithDestination.DestinationIsIndirect && aInstructionWithDestination.DestinationDisplacement > 0))) {
aSize += (ulong)aEncodingOption.DefaultSize / 8;
}
if (aEncodingOption.DefaultSize == InstructionSize.DWord && aInstructionWithSize != null && aInstructionWithSize.Size == 16) {
aSize += 1;
}
if (aEncodingOption.DefaultSize == InstructionSize.Word && aInstructionWithSize != null && aInstructionWithSize.Size == 32) {
aSize += 1;
}
aInstruction.mDataSize = aSize;
return true;
}
public override bool DetermineSize(Indy.IL2CPU.Assembler.Assembler aAssembler, out ulong aSize) {
var xInstructionWithDestination = this as IInstructionWithDestination;
var xInstructionWithSource = this as IInstructionWithSource;
var xInstructionWithSize = this as IInstructionWithSize;
InstructionData xInstructionData = null;
InstructionData.InstructionEncodingOption xEncodingOption = null;
if (!GetEffectiveInstructionInfo(this, xInstructionWithDestination, xInstructionWithSize, xInstructionWithSource, out xInstructionData, out xEncodingOption)) {
return base.DetermineSize(aAssembler, out aSize);
}
return DetermineSize(aAssembler, out aSize, this, xInstructionWithDestination, xInstructionWithSize, xInstructionWithSource, xInstructionData, xEncodingOption);
}
public override bool IsComplete(Indy.IL2CPU.Assembler.Assembler aAssembler) {
var xWithDest = this as IInstructionWithDestination;
var xWithSource = this as IInstructionWithSource;
var xWithSize = this as IInstructionWithSize;
ulong xAddress;
if (xWithDest != null) {
if (xWithDest.DestinationRef != null && !xWithDest.DestinationRef.Resolve(aAssembler, out xAddress)) {
return false;
}
}
if (xWithSource != null) {
if (xWithSource.SourceRef != null && !xWithSource.SourceRef.Resolve(aAssembler, out xAddress)) {
return false;
}
}
return true;
}
private ulong? mDataSize;
public override ulong? ActualAddress {
get {
if (!StartAddress.HasValue) {
return null;
}
if (!mDataSize.HasValue) {
return null;
}
return StartAddress.Value + mDataSize.Value;
}
}
public override byte[] GetData(Indy.IL2CPU.Assembler.Assembler aAssembler) {
var xInstructionWithDestination = this as IInstructionWithDestination;
var xInstructionWithSource = this as IInstructionWithSource;
var xInstructionWithSize = this as IInstructionWithSize;
InstructionData xInstructionData = null;
InstructionData.InstructionEncodingOption xEncodingOption = null;
if (!GetEffectiveInstructionInfo(this, xInstructionWithDestination, xInstructionWithSize, xInstructionWithSource, out xInstructionData, out xEncodingOption)) {
return base.GetData(aAssembler);
}
return GetData(aAssembler, this, xInstructionWithDestination, xInstructionWithSize, xInstructionWithSource, xInstructionData, xEncodingOption);
}
private static byte[] GetData(Indy.IL2CPU.Assembler.Assembler aAssembler, Instruction aInstruction, IInstructionWithDestination aInstructionWithDestination, IInstructionWithSize aInstructionWithSize, IInstructionWithSource aInstructionWithSource, InstructionData aInstructionData, InstructionData.InstructionEncodingOption aEncodingOption) {
ulong xSize = 0;
Instruction.DetermineSize(aAssembler, out xSize, aInstruction, aInstructionWithDestination, aInstructionWithSize, aInstructionWithSource, aInstructionData, aEncodingOption);
if (xSize == 0) {
return new byte[0];
}
var xBuffer = new byte[xSize];
int xExtraOffset = 0;
int xOpCodeOffset = 0;
if (aInstructionWithSize != null) {
if (aEncodingOption.DefaultSize == InstructionSize.DWord && aInstructionWithSize.Size == 16) {
xOpCodeOffset += 1;
xExtraOffset++;
xBuffer[0] = 0x66;
}
if (aEncodingOption.DefaultSize == InstructionSize.Word && aInstructionWithSize.Size == 32) {
xOpCodeOffset += 1;
xExtraOffset++;
xBuffer[0] = 0x66;
}
}
Array.Copy(aEncodingOption.OpCode, 0, xBuffer, xExtraOffset, aEncodingOption.OpCode.Length);
if (aInstructionWithDestination != null) {
if (aInstructionWithDestination.DestinationReg != Guid.Empty && aEncodingOption.DestinationRegByte.HasValue && !aEncodingOption.NeedsModRMByte) {
xBuffer[aEncodingOption.DestinationRegByte.Value + xExtraOffset] |= (byte)(EncodeRegister(aInstructionWithDestination.DestinationReg) << aEncodingOption.DestinationRegBitShiftLeft);
}
}
if (aInstructionWithSource != null) {
if (aInstructionWithSource.SourceReg != Guid.Empty && aEncodingOption.SourceRegByte.HasValue) {
xBuffer[aEncodingOption.SourceRegByte.Value + xExtraOffset] |= (byte)(EncodeRegister(aInstructionWithSource.SourceReg) << aEncodingOption.SourceRegBitShiftLeft);
}
}
if (aEncodingOption.NeedsModRMByte) {
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] = aEncodingOption.InitialModRMByteValue;
if (aInstructionWithDestination != null) {
if (aInstructionWithDestination.DestinationReg != Guid.Empty) {
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] |= EncodeRegister(aInstructionWithDestination.DestinationReg);
}
byte? xSIB = null;
//if (!aInstructionWithDestination.DestinationIsIndirect) {
if ((aInstructionWithDestination.DestinationReg == Registers.EBP && !(aInstructionWithDestination.DestinationIsIndirect && aInstructionWithDestination.DestinationDisplacement > 0)) ||
aInstructionWithDestination.DestinationReg == Registers.ESP) {
if (aInstructionWithDestination.DestinationReg == Registers.EBP) {
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] |= 1 << 6;
xSIB = 0;
}
if (aInstructionWithDestination.DestinationReg == Registers.ESP) {
xSIB = 0x24;
}
} else {
if (!(aInstructionWithSource != null &&
((aInstructionWithSource.SourceReg == Registers.EBP && !(aInstructionWithSource.SourceReg != Guid.Empty && aInstructionWithSource.SourceIsIndirect && aInstructionWithSource.SourceDisplacement > 0)) ||
aInstructionWithSource.SourceReg == Registers.ESP)) && (aInstructionWithDestination.DestinationReg == Guid.Empty && aInstructionWithDestination.DestinationIsIndirect)) {
// todo: fix for 16bit mode, it should then be 0x36
//xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] |= 0x5;
//ulong xAddress = 0;
//if (!(aInstructionWithDestination.DestinationRef != null && aInstructionWithDestination.DestinationRef.Resolve(aAssembler, out xAddress))) {
// if (aInstructionWithDestination.DestinationValue.HasValue) {
// xAddress = aInstructionWithDestination.DestinationValue.Value;
// }
//}
//xAddress += (ulong)aInstructionWithDestination.DestinationDisplacement;
//Array.Copy(BitConverter.GetBytes((uint)xAddress), 0, xBuffer, aEncodingOption.OpCode.Length + xExtraOffset + 1, 4);
//xExtraOffset += 4;
// todo: fix for 16bit mode, it should then be 0x36
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] |= 0x5;
ulong xAddress = 0;
if (!(aInstructionWithDestination.DestinationRef != null && aInstructionWithDestination.DestinationRef.Resolve(aAssembler, out xAddress))) {
if (aInstructionWithDestination.DestinationValue.HasValue) {
xAddress = aInstructionWithDestination.DestinationValue.Value;
}
}
xAddress += (ulong)aInstructionWithDestination.DestinationDisplacement;
Array.Copy(BitConverter.GetBytes((uint)xAddress), 0, xBuffer, aEncodingOption.OpCode.Length + xExtraOffset + 1, 4);
xExtraOffset += 4;
}
}
//xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] |= 3 << 6;
//}
if (aInstructionWithSource != null && aInstructionWithSource.SourceReg != Guid.Empty) {
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] |= (byte)(EncodeRegister(aInstructionWithSource.SourceReg) << 3);
}
//SBArray.Resize(ref xBuffer, xBuffer.Length + 1);
if (aInstructionWithDestination.DestinationReg != Guid.Empty && aInstructionWithDestination.DestinationIsIndirect && aInstructionWithDestination.DestinationDisplacement > 0) {
var xSIBOffset = 0;
if (xSIB != null) {
//xExtraOffset++;
xSIBOffset = 1;
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset + xSIBOffset] = xSIB.Value;
}
// todo: optimize for different displacement sizes
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] |= 2 << 6; // for now use 8bit value
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] &= 0xBF; // clear the 1 << 6
Array.Copy(BitConverter.GetBytes(aInstructionWithDestination.DestinationDisplacement), 0, xBuffer, aEncodingOption.OpCode.Length + xExtraOffset + xSIBOffset + 1, 4);
xExtraOffset += 4;
//}
if (xSIB != null) {
xExtraOffset++;
}
} else {
if (xSIB != null) {
xExtraOffset++;
xBuffer[aEncodingOption.OpCode.Length + xExtraOffset] = xSIB.Value;
}
}
}
//EncodeModRMByte(aInstruction.DestinationReg, aInstruction.DestinationIsIndirect, aInstruction.DestinationDisplacement > 0, aInstruction.DestinationDisplacement > 255, out xSIB);
}
if (aInstructionWithDestination != null) {
if (aInstructionWithDestination.DestinationValue.HasValue && !aInstructionWithDestination.DestinationIsIndirect) {
int xOffset = aEncodingOption.OpCode.Length + xExtraOffset;
if (aEncodingOption.NeedsModRMByte) {
xOffset++;
}
var xInstrSize = 0;
var xValue = aInstructionWithDestination.DestinationValue.Value;
if (aInstructionWithSize != null) {
xInstrSize = aInstructionWithSize.Size / 8;
} else {
// throw new NotImplementedException("size not known");
xInstrSize = (int)aEncodingOption.DefaultSize / 8;
}
Array.Copy(BitConverter.GetBytes(xValue), 0, xBuffer, xOffset, xInstrSize);
}
}
// todo: add more options
if (aInstructionWithSource != null) {
if (aInstructionWithSource.SourceValue.HasValue) {
int xOffset = aEncodingOption.OpCode.Length + xExtraOffset;
if (aEncodingOption.NeedsModRMByte) {
xOffset++;
}
var xInstrSize = 0;
if (aInstructionWithSize != null) {
xInstrSize = aInstructionWithSize.Size / 8;
} else {
throw new NotImplementedException("size not known");
}
Array.Copy(BitConverter.GetBytes(aInstructionWithSource.SourceValue.Value), 0, xBuffer, xOffset, xInstrSize);
}
}
if (aInstructionWithSize != null) {
if (aEncodingOption.OperandSizeByte.HasValue)
{
if(aInstructionWithSize.Size != 8) {
xBuffer[aEncodingOption.OperandSizeByte.Value + xOpCodeOffset] |= (byte)(1 << aEncodingOption.OperandSizeBitShiftLeft);
}
}
}
if(aEncodingOption.ModifyBytes != null) {
aEncodingOption.ModifyBytes(xBuffer, aInstruction);
}
//
return xBuffer;
}
private static byte EncodeRegister(Guid aRegister) {
// todo: implement support for other registers
if (aRegister == Registers.EAX) return 0x0;
if (aRegister == Registers.ECX) return 0x1;
if (aRegister == Registers.EDX) return 0x2;
if (aRegister == Registers.EBX) return 0x3;
if (aRegister == Registers.ESP) return 0x4;
if (aRegister == Registers.EBP) return 0x5;
if (aRegister == Registers.ESI) return 0x6;
if (aRegister == Registers.EDI) return 0x7;
if (aRegister == Registers.AX) return 0x0;
if (aRegister == Registers.CX) return 0x1;
if (aRegister == Registers.DX) return 0x2;
if (aRegister == Registers.BX) return 0x3;
if (aRegister == Registers.SP) return 0x4;
if (aRegister == Registers.BP) return 0x5;
if (aRegister == Registers.SI) return 0x6;
if (aRegister == Registers.DI) return 0x7;
if (aRegister == Registers.AL) return 0x0;
if (aRegister == Registers.CL) return 0x1;
if (aRegister == Registers.DL) return 0x2;
if (aRegister == Registers.BL) return 0x3;
if (aRegister == Registers.AH) return 0x4;
if (aRegister == Registers.CH) return 0x5;
if (aRegister == Registers.DH) return 0x6;
if (aRegister == Registers.BH) return 0x7;
throw new Exception("Register not supported!");
}
/*
private static bool SizeIsSelected(InstructionSizes aSizes, byte aSize) {
switch(aSize) {
case 8: return (aSizes & InstructionSizes.Byte) != 0;
case 16: return (aSizes & InstructionSizes.Byte) != 0;
case 32: return (aSizes & InstructionSizes.Byte) != 0;
default: throw new NotImplementedException();
}
}
public override byte[] GetData(Indy.IL2CPU.Assembler.Assembler aAssembler) {
InstructionData xInstructionData = null;
using (mInstructionDatasLocker.AcquireReaderLock()) {
mInstructionDatas.TryGetValue(this.GetType(), out xInstructionData);
}
if (xInstructionData == null) {
return base.GetData(aAssembler);
}
var xWithDestAndSourceAndSize = this as InstructionWithDestinationAndSourceAndSize;
if (xWithDestAndSourceAndSize != null) {
return GetData(aAssembler, xWithDestAndSourceAndSize, xInstructionData);
}
var xWithDestAndSource = this as InstructionWithDestinationAndSource;
if (xWithDestAndSource != null) {
return base.GetData(aAssembler);
}
var xWithDestAndSize = this as InstructionWithDestinationAndSize;
if (xWithDestAndSize != null) {
return base.GetData(aAssembler);
}
var xWithDest = this as InstructionWithDestination;
if (xWithDest != null) {
return base.GetData(aAssembler);
}
if (xInstructionData.EncodingOptions.Count > 0) {
// todo: improve
return xInstructionData.EncodingOptions[0].OpCode;
}
return null;
}
private static byte[] GetData(Indy.IL2CPU.Assembler.Assembler aAssembler, InstructionWithDestinationAndSourceAndSize aInstruction, InstructionData aInstructionData) {
var xEncodingOption = GetInstructionEncodingOption(aInstruction, aInstructionData);
if(aInstruction.ToString() == "mov word [ESP], 0x47") {
Console.Write("");
}
ulong xSize = 0;
Instruction.DetermineSize(aInstruction, aInstructionData, out xSize);
if(xSize==0) {
return new byte[0];
}
var xBuffer = new byte[xSize];
int xExtraOffset = 0;
int xOpCodeOffset = 0;
if (xEncodingOption.DefaultSize == InstructionSize.DWord && aInstruction.Size == 16) {
xOpCodeOffset += 1;
xExtraOffset++;
xBuffer[0] = 0x66;
}
if (xEncodingOption.DefaultSize == InstructionSize.Word && aInstruction.Size == 32) {
xOpCodeOffset += 1;
xExtraOffset++;
xBuffer[0] = 0x66;
}
Array.Copy(xEncodingOption.OpCode, 0, xBuffer, xExtraOffset, xEncodingOption.OpCode.Length);
byte? xSIB = null;
if (xEncodingOption.NeedsModRMByte) {
xBuffer[xEncodingOption.OpCode.Length + xExtraOffset] = EncodeModRMByte(aInstruction.DestinationReg, aInstruction.DestinationIsIndirect, aInstruction.DestinationDisplacement > 0, aInstruction.DestinationDisplacement > 255, out xSIB);
//byte
// = EncodeModRMByte()
//if(aInstruction.DestinationReg != Guid.Empty && !aInstruction.DestinationIsIndirect) {
// xBuffer[xEncodingOption.OpCode.Length] |= 0xC0;
//}
//if(aInstruction.DestinationReg != Guid.Empty && aInstruction.DestinationIsIndirect) {
// //
//}
// todo: add more ModRM stuff
}
if (aInstruction.DestinationReg != Guid.Empty && xEncodingOption.DestinationRegByte.HasValue && !xEncodingOption.NeedsModRMByte) {
xBuffer[xEncodingOption.DestinationRegByte.Value + xExtraOffset] |= (byte)(EncodeRegister(aInstruction.DestinationReg) << xEncodingOption.DestinationRegBitShiftLeft);
}
if (aInstruction.SourceReg != Guid.Empty && xEncodingOption.SourceRegByte.HasValue) {
xBuffer[xEncodingOption.SourceRegByte.Value + xExtraOffset] |= (byte)(EncodeRegister(aInstruction.SourceReg) << xEncodingOption.SourceRegBitShiftLeft);
}
if(xSIB!=null) {
xBuffer[xEncodingOption.OpCode.Length + xExtraOffset + 1] = xSIB.Value;
xExtraOffset++;
}
// todo: add more options
if (aInstruction.SourceValue.HasValue) {
int xOffset = xEncodingOption.OpCode.Length + xExtraOffset;
if(xEncodingOption.NeedsModRMByte) {
xOffset++;
}
Array.Copy(BitConverter.GetBytes(aInstruction.SourceValue.Value), 0, xBuffer, xOffset, aInstruction.Size / 8);
}
if (xEncodingOption.OperandSizeByte.HasValue) {
if (aInstruction.Size > 8) {
xBuffer[xEncodingOption.OperandSizeByte.Value + xOpCodeOffset] |= (byte)(1 << xEncodingOption.OperandSizeBitShiftLeft);
}
}
//
return xBuffer;
}
private static byte EncodeModRMByte(Guid aRegister, bool aIndirect, bool aOffset, bool aOffsetIs32Bit, out byte? aSIB) {
byte xModRM = 0;
xModRM |= EncodeRegister(aRegister);
aSIB = null;
if(!aOffset) {
if (aRegister == Registers.EBP) {
xModRM |= 1 << 6;
aSIB = 0;
}
if(aRegister == Registers.ESP) {
aSIB = 0x24;
}
}
if(aOffset) {
throw new NotImplementedException("Add support for offsets");
}
return xModRM;
}
private static bool IsLargeRegister(Guid aRegister) {
return Registers.Is32Bit(aRegister);
}
*/
}
}
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