public void IsEvDwordTrue()
{
code = new Byte[] { 0x31, 0x05 };
Assert.IsTrue(ModRM.IsEvDword(code));
}
public RegisterName GetSourceRegisterFor(Byte[] code)
{
var opcodeEncoding = GetEncodingFor(code);
if (GetStackEffectFor(code) ==
StackEffect.Push)
{
switch (opcodeEncoding)
{
case OpcodeEncoding.rBP:
{
return(RegisterName.EBP);
}
case OpcodeEncoding.rSI:
{
return(RegisterName.ESI);
}
case OpcodeEncoding.rSP:
{
return(RegisterName.ESP);
}
case OpcodeEncoding.rAX:
{
return(RegisterName.EAX);
}
case OpcodeEncoding.rBX:
{
return(RegisterName.EBX);
}
case OpcodeEncoding.rCX:
{
return(RegisterName.ECX);
}
case OpcodeEncoding.rDX:
{
return(RegisterName.EDX);
}
}
}
switch (opcodeEncoding)
{
case OpcodeEncoding.EbGb:
case OpcodeEncoding.EvGv:
{
return(ModRM.GetGvFor(code));
}
case OpcodeEncoding.GvEb:
case OpcodeEncoding.GvEv:
case OpcodeEncoding.GvM:
{
if (ModRM.HasSIB(code))
{
// MOV EAX,DWORD PTR DS:[EDX+EAX*4]
// Since SIB does not have a single source register
// it currently returns RegisterName.None
return(RegisterName.None);
}
if (ModRM.IsEvDword(code))
{
return(RegisterName.None);
}
return(ModRM.GetEvFor(code));
}
default:
{
return(RegisterName.None);
}
}
}
public void IsEvDwordFalse()
{
code = new Byte[] { 0x31, 0x07 };
Assert.IsFalse(ModRM.IsEvDword(code));
}