private ParsedOperand ParsePtrOperand(PrimitiveType width)
{
Expect(Token.PTR);
ParsedOperand op = ParseOperand();
op.Operand.Width = width;
return(op);
}
public ParsedOperand [] ParseOperandList(int min, int max)
{
OperandParser opp = asm.CreateOperandParser(lexer);
List <ParsedOperand> ops = new List <ParsedOperand>();
asm.SegmentOverride = RegisterStorage.None;
asm.AddressWidth = asm.SegmentAddressWidth;
if (lexer.PeekToken() != Token.EOL)
{
ops.Add(opp.ParseOperand());
if (opp.SegmentOverride != RegisterStorage.None)
{
asm.SegmentOverride = opp.SegmentOverride;
}
if (opp.AddressWidth != null)
{
asm.AddressWidth = opp.AddressWidth;
}
while (lexer.PeekToken() == Token.COMMA)
{
lexer.DiscardToken();
opp.DataWidth = ops[0].Operand.Width;
ops.Add(opp.ParseOperand());
if (opp.SegmentOverride != RegisterStorage.None)
{
if (asm.SegmentOverride != RegisterStorage.None)
{
Error("Can't have two segment overrides in one instruction");
}
asm.SegmentOverride = opp.SegmentOverride;
}
if (opp.AddressWidth != null)
{
asm.AddressWidth = opp.AddressWidth;
}
}
}
if (min <= ops.Count && ops.Count <= max)
{
ParsedOperand [] o = new ParsedOperand[ops.Count];
ops.CopyTo(o);
return(o);
}
else
{
if (min == max)
{
Error(string.Format("Instruction expects {0} operand(s).", min));
}
else
{
Error(string.Format("Instruction expects between {0} and {1} operand(s).", min, max));
}
return(null);
}
}
internal void ProcessBitScan(byte opCode, ParsedOperand dst, ParsedOperand src)
{
PrimitiveType dataWidth = EnsureValidOperandSize(src);
RegisterOperand regDst = dst.Operand as RegisterOperand;
if (regDst == null)
Error("First operand of bit scan instruction must be a register");
EmitOpcode(0x0F, dataWidth);
emitter.EmitByte(opCode);
EmitModRM(RegisterEncoding(regDst.Register), src);
}
internal void EmitModRM(int reg, ParsedOperand op)
{
RegisterOperand regOp = op.Operand as RegisterOperand;
if (regOp != null)
{
modRm.EmitModRM(reg, regOp);
return;
}
FpuOperand fpuOp = op.Operand as FpuOperand;
if (fpuOp != null)
{
modRm.EmitModRM(reg, fpuOp);
}
else
{
EmitModRM(reg, (MemoryOperand) op.Operand, op.Symbol);
}
}
private PrimitiveType EnsureValidOperandSizes(ParsedOperand[] ops, int count)
{
if (count == 0)
return null;
PrimitiveType w = ops[0].Operand.Width;
if (count == 1 && ops[0].Operand.Width == null)
Error("Width of the first operand is unknown");
if (count == 2)
{
if (w == null)
{
w = ops[1].Operand.Width;
if (w == null)
Error("Width of the first operand is unknown");
else
ops[0].Operand.Width = w;
}
else
{
if (ops[1].Operand.Width == null)
ops[1].Operand.Width = w;
else if (ops[0].Operand.Width != ops[0].Operand.Width)
Error("Operand widths don't match");
}
}
return w;
}
internal void ProcessPushPop(bool fPop, ParsedOperand op)
{
int imm;
ImmediateOperand immOp = op.Operand as ImmediateOperand;
if (immOp != null)
{
if (fPop)
throw new ApplicationException("Can't pop an immediate value");
imm = immOp.Value.ToInt32();
if (IsSignedByte(imm))
{
EmitOpcode(0x6A, PrimitiveType.Byte);
emitter.EmitByte(imm);
}
else
{
EmitOpcode(0x68, SegmentDataWidth);
emitter.EmitLe(SegmentDataWidth, imm);
}
return;
}
PrimitiveType dataWidth = EnsureValidOperandSize(op);
RegisterOperand regOp = op.Operand as RegisterOperand;
if (regOp != null)
{
var rrr = regOp.Register;
if (IsBaseRegister(rrr))
{
EmitOpcode(0x50 | (fPop ? 8 : 0) | RegisterEncoding(regOp.Register), dataWidth);
}
else
{
int mask = (fPop ? 1 : 0);
if (regOp.Register == Registers.es) emitter.EmitByte(0x06 | mask);
else
if (regOp.Register == Registers.cs) emitter.EmitByte(0x0E | mask);
else
if (regOp.Register == Registers.ss) emitter.EmitByte(0x16 | mask);
else
if (regOp.Register == Registers.ds) emitter.EmitByte(0x1E | mask);
else
if (regOp.Register == Registers.fs) { emitter.EmitByte(0x0F); emitter.EmitByte(0xA0 | mask); }
else
if (regOp.Register == Registers.gs) { emitter.EmitByte(0x0F); emitter.EmitByte(0xA8 | mask); }
}
return;
}
EmitOpcode(fPop ? 0x8F : 0xFF, dataWidth);
EmitModRM(fPop ? 0 : 6, op);
}
internal void ProcessShiftRotation(byte bits, ParsedOperand dst, ParsedOperand count)
{
PrimitiveType dataWidth = EnsureValidOperandSize(dst);
ImmediateOperand immOp = count.Operand as ImmediateOperand;
if (immOp != null)
{
int imm = immOp.Value.ToInt32();
if (imm == 1)
{
EmitOpcode(0xD0 | IsWordWidth(dataWidth), dataWidth);
EmitModRM(bits, dst);
}
else
{
EmitOpcode(0xC0 | IsWordWidth(dataWidth), dataWidth);
EmitModRM(bits, dst, (byte) immOp.Value.ToInt32());
}
return;
}
RegisterOperand regOp = count.Operand as RegisterOperand;
if (regOp != null && regOp.Register == Registers.cl)
{
EmitOpcode(0xD2 | IsWordWidth(dataWidth), dataWidth);
EmitModRM(bits, dst);
return;
}
throw new ApplicationException("Shift/rotate instructions must be followed by a constant or CL");
}
internal void ProcessIncDec(bool fDec, ParsedOperand op)
{
PrimitiveType dataWidth = EnsureValidOperandSize(op);
RegisterOperand regOp = op.Operand as RegisterOperand;
if (regOp != null)
{
if (IsWordWidth(dataWidth) != 0)
{
EmitOpcode((fDec ? 0x48 : 0x40) | RegisterEncoding(regOp.Register), dataWidth);
}
else
{
EmitOpcode(0xFE | IsWordWidth(dataWidth), dataWidth);
EmitModRM(fDec ? 1 : 0, op);
}
return;
}
MemoryOperand memOp = op.Operand as MemoryOperand;
if (memOp != null)
{
EmitOpcode(0xFE | IsWordWidth(dataWidth), dataWidth);
EmitModRM(fDec ? 1 : 0, op);
}
else
{
throw new ApplicationException("constant operator illegal");
}
}
internal void ProcessMovx(int opcode, ParsedOperand[] ops)
{
PrimitiveType dataWidth = EnsureValidOperandSize(ops[1]);
RegisterOperand regDst = ops[0].Operand as RegisterOperand;
if (regDst == null)
Error("First operand must be a register");
EmitOpcode(0x0F, regDst.Width);
emitter.EmitByte(opcode | IsWordWidth(dataWidth));
EmitModRM(RegisterEncoding(regDst.Register), ops[1]);
}
public void Cmp(ParsedOperand src, int dst)
{
ProcessBinop(0x7, src, Imm(dst));
}
public void Sub(ParsedOperand op, int constant)
{
Sub(op, Imm(op.Operand.Width, constant));
}
public void Shrd(ParsedOperand op1, ParsedOperand op2, byte count)
{
ProcessDoubleShift(8, op1, op2, new ParsedOperand(ImmediateOperand.Byte(count)));
}
public void Bsr(ParsedOperand dst, ParsedOperand src)
{
ProcessBitScan(0xBD, dst, src);
}
public void Shld(ParsedOperand op1, ParsedOperand op2, ParsedOperand op3)
{
ProcessDoubleShift(0, op1, op2, op3);
}
internal void ProcessDoubleShift(byte bits, ParsedOperand op0, ParsedOperand op1, ParsedOperand count)
{
PrimitiveType dataWidth = EnsureValidOperandSize(op0);
RegisterOperand regSrc = op1.Operand as RegisterOperand;
if (regSrc == null)
Error("Second operand of SHLD/SHRD must be a register");
ImmediateOperand immShift = count.Operand as ImmediateOperand;
RegisterOperand regShift = count.Operand as RegisterOperand;
if (regShift != null && regShift.Register == Registers.cl)
{
bits |= 0x01;
}
else if (immShift == null)
{
Error("SHLD/SHRD instruction must be followed by a constant or CL");
}
EmitOpcode(0x0F, dataWidth);
emitter.EmitByte(0xA4 | bits);
EmitModRM(RegisterEncoding(regSrc.Register), op0);
if (immShift != null)
emitter.EmitByte((byte) immShift.Value.ToUInt32());
}
internal void ProcessCallJmp(bool far, int indirect, ParsedOperand op)
{
if (far) indirect |= 1;
EmitOpcode(0xFF, SegmentDataWidth);
EmitModRM(indirect, op);
}
internal void ProcessFpuCommon(int opcodeFreg, int opcodeMem, int fpuOperation, bool isPop, bool fixedOrder, params ParsedOperand[] ops)
{
if (ops.Length == 0)
{
ops = new ParsedOperand[] { new ParsedOperand(new FpuOperand(0)), new ParsedOperand(new FpuOperand(1)) };
}
else if (ops.Length == 1 && ops[0].Operand is FpuOperand)
{
ops = new ParsedOperand[] { new ParsedOperand(new FpuOperand(0)), ops[0] };
}
FpuOperand fop1 = ops[0].Operand as FpuOperand;
FpuOperand fop2 = ops.Length > 1 ? ops[1].Operand as FpuOperand : null;
MemoryOperand mop = ops[0].Operand as MemoryOperand;
if (mop == null && ops.Length > 1)
mop = ops[1].Operand as MemoryOperand;
if (mop != null)
{
EmitOpcode(opcodeMem | (mop.Width == PrimitiveType.Word64 ? 4 : 0), null);
EmitModRM(fpuOperation, mop, null);
return;
}
if (isPop)
{
if (fop1 == null)
Error("First operand must be of type ST(n)");
EmitOpcode(opcodeFreg, null);
if (fixedOrder)
fpuOperation ^= 1;
if (fop1.StNumber == 0)
EmitModRM(fpuOperation, new ParsedOperand(fop2, null));
else
EmitModRM(fpuOperation, new ParsedOperand(fop1, null));
return;
}
if (fop1 != null)
{
fop2 = (FpuOperand) ops[1].Operand;
if (fop1.StNumber != 0)
{
if (fop2.StNumber != 0)
Error("at least one of the floating point stack arguments must be ST(0)");
if (fixedOrder)
fpuOperation ^= 1;
fop2 = fop1;
}
EmitOpcode(opcodeFreg, null);
EmitModRM(fpuOperation, new ParsedOperand(fop2, null));
return;
}
throw new NotImplementedException("NYI");
}
public void Les(ParsedOperand dst, ParsedOperand src)
{
ProcessLxs(-1, 0xC4, dst, src);
}
internal void ProcessFst(bool pop, ParsedOperand operand)
{
FpuOperand fop = operand.Operand as FpuOperand;
MemoryOperand mop = operand.Operand as MemoryOperand;
int regBits = pop ? 3 : 2;
if (mop != null)
{
switch (mop.Width.Size)
{
case 4: EmitOpcode(0xD9, null); break;
case 8: EmitOpcode(0xDD, null); break;
default: Error("Unexpected operator width"); break;
}
EmitModRM(regBits, operand);
}
else if (fop != null)
{
EmitOpcode(0xDD, null);
EmitModRM(regBits, new ParsedOperand(fop, null));
}
else
Error("Unexpected operator type");
}
public void Sub(ParsedOperand minuend, ParsedOperand subtrahend)
{
ProcessBinop(0x05, minuend, subtrahend);
}
internal void ProcessInt(ParsedOperand vector)
{
ImmediateOperand op = (ImmediateOperand) vector.Operand;
EmitOpcode(0xCD, null);
emitter.EmitByte(op.Value.ToInt32());
}
public void Test(ParsedOperand op1, ParsedOperand op2)
{
ProcessTest( op1, op2 );
}
public void Mul(ParsedOperand op)
{
PrimitiveType dataWidth = EnsureValidOperandSize(op);
// Single operand doesn't accept immediate values.
if (op.Operand is ImmediateOperand)
Error("Immediate operand not allowed for single-argument multiplication");
EmitOpcode(0xF6 | IsWordWidth(dataWidth), dataWidth);
EmitModRM(4, op);
}
internal void Xchg(ParsedOperand[] ops)
{
PrimitiveType dataWidth = EnsureValidOperandSizes(ops, 2);
RegisterOperand regOp = ops[0].Operand as RegisterOperand;
ParsedOperand otherOp = ops[1];
if (regOp == null)
{
regOp = ops[1].Operand as RegisterOperand;
if (regOp == null)
{
Error("One operand must be a register.");
}
otherOp = ops[0];
}
EmitOpcode(0x86 | IsWordWidth(regOp), dataWidth);
EmitModRM(RegisterEncoding(regOp.Register), otherOp);
}
internal void ProcessSetCc(byte bits, ParsedOperand op)
{
PrimitiveType dataWidth = EnsureValidOperandSize(op);
if (dataWidth != PrimitiveType.Byte)
Error("Instruction takes only a byte operand");
EmitOpcode(0x0F, dataWidth);
emitter.EmitByte(0x90 | (bits & 0xF));
EmitModRM(0, op);
}
public void Xor(ParsedOperand dst, ParsedOperand src)
{
ProcessBinop(0x06, dst, src);
}
internal void ProcessUnary(int operation, ParsedOperand op)
{
PrimitiveType dataWidth = EnsureValidOperandSize(op);
EmitOpcode(0xF6 | IsWordWidth(dataWidth), dataWidth);
EmitModRM(operation, op);
}
internal void ProcessBitOp(ParsedOperand[] ops)
{
PrimitiveType dataWidth = EnsureValidOperandSize(ops[0]);
ImmediateOperand imm2 = ops[1].Operand as ImmediateOperand;
if (imm2 != null)
{
EmitOpcode(0x0F, dataWidth);
emitter.EmitByte(0xBA);
EmitModRM(0x04, ops[0]);
emitter.EmitByte(imm2.Value.ToInt32());
}
else
{
EmitOpcode(0x0F, dataWidth);
emitter.EmitByte(0xA3);
EmitModRM(RegisterEncoding(((RegisterOperand) ops[1].Operand).Register), ops[0]);
}
}
internal void EmitModRM(int reg, ParsedOperand op, byte b)
{
RegisterOperand regOp = op.Operand as RegisterOperand;
if (regOp != null)
{
modRm.EmitModRM(reg, regOp);
emitter.EmitByte(b);
}
else
{
EmitModRM(reg, (MemoryOperand) op.Operand, b, op.Symbol);
}
}
internal PrimitiveType EnsureValidOperandSize(ParsedOperand op)
{
PrimitiveType w = op.Operand.Width;
if (w == null)
Error("Width of the operand is unknown");
return w;
}
public void Test(ParsedOperand op1, int imm)
{
ProcessTest(op1, Imm(imm));
}
public void Shr(ParsedOperand dst, byte c)
{
ProcessShiftRotation(0x05, dst, new ParsedOperand(new ImmediateOperand(Constant.Byte(c))));
}