public void WriteSegmentOverride(x86Segment selected, x86Segment defaultSeg)
{
if (selected != defaultSeg)
{
switch(selected)
{
case x86Segment.ES:
WriteByte(0x26);
break;
case x86Segment.CS:
WriteByte(0x2E);
break;
case x86Segment.SS:
WriteByte(0x36);
break;
case x86Segment.DS:
WriteByte(0x3E);
break;
case x86Segment.FS:
WriteByte(0x64);
break;
case x86Segment.GS:
WriteByte(0x65);
break;
default:
throw new Exception("Unknown x86 Segment!");
}
}
}
public static string NameSegment(x86Segment seg, bool upper = false)
{
switch (seg)
{
case x86Segment.CS:
return upper ? "CS" : "cs";
case x86Segment.DS:
return upper ? "DS" : "ds";
case x86Segment.ES:
return upper ? "ES" : "es";
case x86Segment.FS:
return upper ? "FS" : "fs";
case x86Segment.GS:
return upper ? "GS" : "gs";
case x86Segment.SS:
return upper ? "SS" : "ss";
default:
throw new Exception("Invalid segment!");
}
}
public Ret(x86Assembler parentAssembler, ushort popSize = 0, x86Segment seg = x86Segment.CS) : base(parentAssembler)
{
PopSize = popSize;
Segment = seg;
}
public static string NameMemIndex(x86Assembler a, x86Register baseRegister, int displacement, x86Register indexRegister, x86IndexShift shift, x86Segment segment)
{
string ret = "";
bool form2 = baseRegister == x86Register.None;
if (form2)
{
ret += NameSegment(segment) + ":0x" + displacement.ToString("X").PadLeft(8, '0');
}
ret += "[" + NameRegister(indexRegister, 4);
switch (shift)
{
case x86IndexShift.Mul1:
break;
case x86IndexShift.Mul2:
ret += " * 2";
break;
case x86IndexShift.Mul4:
ret += " * 4";
break;
case x86IndexShift.Mul8:
ret += " * 8";
break;
default:
throw new Exception("Invalid index shift!");
}
if (baseRegister != x86Register.None)
{
ret += " + " + NameRegister(baseRegister, 4);
}
if (displacement != 0 && !form2)
{
ret += " " + (displacement < 0 ? "-" : "+") + " " + (displacement < 0 ? -displacement : displacement).ToString();
}
return ret + "]";
}
public static string NameMem(x86Assembler a, uint address, x86Segment segment)
{
// Assembler gets passed in here because we will eventually do symbol lookup.
return "[" + NameSegment(segment) + ":0x" + address.ToString("X").PadLeft(8, '0') + "]";
}
public void WriteRegister(byte o, x86Segment r)
{
WriteModRM(x86AddressingMode.Register, o, (byte)r);
}
