public static string GetEncodingString(Opcode opcode, InstructionEncoding encoding)
{
var str = new StringBuilder(30);
var xexType = opcode & Opcode.XexType_Mask;
if (xexType == Opcode.XexType_LegacyOrRex)
{
// Legacy Xex: 66 REX.W 0F 38
switch (opcode & Opcode.SimdPrefix_Mask)
{
case Opcode.SimdPrefix_None: break;
case Opcode.SimdPrefix_66: str.Append("66 "); break;
case Opcode.SimdPrefix_F2: str.Append("F2 "); break;
case Opcode.SimdPrefix_F3: str.Append("F3 "); break;
default: throw new UnreachableException();
}
if ((encoding & InstructionEncoding.RexW_Mask) != InstructionEncoding.RexW_Ignored
&& (opcode & Opcode.RexW) == Opcode.RexW)
{
str.Append("REX.W ");
}
switch (opcode & Opcode.Map_Mask)
{
case Opcode.Map_Default: break;
case Opcode.Map_0F: str.Append("0F "); break;
case Opcode.Map_0F38: str.Append("0F 38 "); break;
case Opcode.Map_0F3A: str.Append("0F 3A "); break;
default: throw new UnreachableException();
}
}
else
{
// Vex/Xop/EVex: VEX.NDS.LIG.66.0F3A.WIG
switch (xexType)
{
case Opcode.XexType_Vex: str.Append("VEX"); break;
case Opcode.XexType_Xop: str.Append("XOP"); break;
case Opcode.XexType_EVex: str.Append("EVEX"); break;
default: throw new UnreachableException();
}
// TODO: Pretty print .NDS or similar
switch (encoding & InstructionEncoding.VexL_Mask)
{
case InstructionEncoding.VexL_Fixed:
switch (opcode & Opcode.VexL_Mask)
{
case Opcode.VexL_0: str.Append(".L0"); break;
case Opcode.VexL_1: str.Append(".L1"); break;
case Opcode.VexL_2: str.Append(".L2"); break;
default: throw new UnreachableException();
}
break;
case InstructionEncoding.VexL_Ignored:
str.Append(".LIG");
break;
default: throw new NotImplementedException();
}
switch (opcode & Opcode.SimdPrefix_Mask)
{
case Opcode.SimdPrefix_None: break;
case Opcode.SimdPrefix_66: str.Append(".66"); break;
case Opcode.SimdPrefix_F2: str.Append(".F2"); break;
case Opcode.SimdPrefix_F3: str.Append(".F3"); break;
default: throw new UnreachableException();
}
if (xexType == Opcode.XexType_Xop)
{
switch (opcode & Opcode.Map_Mask)
{
case Opcode.Map_Xop8: str.Append(".M8"); break;
case Opcode.Map_Xop9: str.Append(".M9"); break;
case Opcode.Map_Xop10: str.Append(".M10"); break;
default: throw new UnreachableException();
}
}
else
{
switch (opcode & Opcode.Map_Mask)
{
case Opcode.Map_0F: str.Append(".0F"); break;
case Opcode.Map_0F38: str.Append(".0F38"); break;
case Opcode.Map_0F3A: str.Append(".0F3A"); break;
default: throw new UnreachableException();
}
}
switch (encoding & InstructionEncoding.RexW_Mask)
{
case InstructionEncoding.RexW_Fixed:
str.Append((opcode & Opcode.RexW) == Opcode.RexW ? ".W1" : ".W0");
break;
case InstructionEncoding.RexW_Ignored:
str.Append(".WIG");
break;
default: throw new NotImplementedException();
}
str.Append(' ');
}
// String tail: opcode byte and what follows 0B /r ib
// The opcode itself
str.AppendFormat(CultureInfo.InvariantCulture, "{0:X2}", opcode.GetMainByte());
// Suffixes
switch (encoding & InstructionEncoding.OpcodeFormat_Mask)
{
case InstructionEncoding.OpcodeFormat_FixedByte: break;
case InstructionEncoding.OpcodeFormat_EmbeddedRegister: str.Append("+r"); break;
case InstructionEncoding.OpcodeFormat_EmbeddedConditionCode: str.Append("+cc"); break;
default: throw new UnreachableException();
}
switch (encoding & InstructionEncoding.ModRM_Mask)
{
case InstructionEncoding.ModRM_Fixed:
str.AppendFormat(CultureInfo.InvariantCulture, " {0:X2}", opcode.GetExtraByte());
break;
case InstructionEncoding.ModRM_FixedModReg:
str.AppendFormat(CultureInfo.InvariantCulture, " {0:X2}+r", opcode.GetExtraByte());
break;
case InstructionEncoding.ModRM_FixedReg:
str.Append(" /");
str.Append((char)('0' + (opcode.GetExtraByte() >> 3)));
break;
case InstructionEncoding.ModRM_Any: str.Append(" /r"); break;
case InstructionEncoding.ModRM_None: break;
default: throw new UnreachableException();
}
AppendImmediate(str, encoding.GetFirstImmediateSize());
AppendImmediate(str, encoding.GetSecondImmediateSize());
return str.ToString();
}