public void EmitStringInstruction(IntelInstruction instr, CodeEmitterOld emitter)
{
this.emitter = emitter;
bool incSi = false;
bool incDi = false;
this.instrCur = instr;
switch (instrCur.code)
{
default:
throw new ApplicationException("NYI");
case Opcode.cmps:
case Opcode.cmpsb:
emitter.Assign(
orw.FlagGroup(IntelInstruction.DefCc(Opcode.cmp)),
new ConditionOf(
new BinaryExpression(Operator.Sub, instrCur.dataWidth, MemSi(), MemDi())));
incSi = true;
incDi = true;
break;
case Opcode.lods:
case Opcode.lodsb:
emitter.Assign(RegAl, MemSi());
incSi = true;
break;
case Opcode.movs:
case Opcode.movsb:
{
Identifier tmp = frame.CreateTemporary(instrCur.dataWidth);
emitter.Assign(tmp, MemSi());
emitter.Store(MemDi(), tmp);
incSi = true;
incDi = true;
break;
}
case Opcode.ins:
case Opcode.insb:
{
Identifier regDX = orw.AluRegister(Registers.edx, instrCur.addrWidth);
emitter.Store(MemDi(), emitter.PseudoProc("__in", instrCur.dataWidth, regDX));
incDi = true;
break;
}
case Opcode.outs:
case Opcode.outsb:
{
Identifier regDX = orw.AluRegister(Registers.edx, instrCur.addrWidth);
emitter.SideEffect("__out" + RegAl.DataType.Prefix, regDX, RegAl);
incSi = true;
break;
}
case Opcode.scas:
case Opcode.scasb:
emitter.Assign(
orw.FlagGroup(IntelInstruction.DefCc(Opcode.cmp)),
new ConditionOf(
new BinaryExpression(Operator.Sub,
instrCur.dataWidth,
RegAl,
MemDi())));
incDi = true;
break;
case Opcode.stos:
case Opcode.stosb:
emitter.Store(MemDi(), RegAl);
incDi = true;
break;
}
if (incSi)
{
emitter.Assign(RegSi,
new BinaryExpression(Operator.Add,
instrCur.addrWidth,
RegSi,
new Constant(instrCur.addrWidth, instrCur.dataWidth.Size)));
}
if (incDi)
{
emitter.Assign(RegDi,
new BinaryExpression(Operator.Add,
instrCur.addrWidth,
RegDi,
new Constant(instrCur.addrWidth, instrCur.dataWidth.Size)));
}
}
public void Rewrite(CodeEmitter emitter)
{
foreach (var de in this.zappedInstructions)
{
instrs[de.Key].code = de.Value;
}
foreach (Instruction instr in rewritten)
{
emitter.Emit(instr);
}
}