/// <summary>
/// based on <a href="https://github.com/dotnet/coreclr/blob/master/src/zap/zapcode.cpp">ZapUnwindData::Save</a>
/// </summary>
public UnwindInfo(byte[] image, int offset)
{
byte versionAndFlags = NativeReader.ReadByte(image, ref offset);
Version = (byte)(versionAndFlags & 7);
Flags = (byte)(versionAndFlags >> 3);
SizeOfProlog = NativeReader.ReadByte(image, ref offset);
CountOfUnwindCodes = NativeReader.ReadByte(image, ref offset);
byte frameRegisterAndOffset = NativeReader.ReadByte(image, ref offset);
FrameRegister = (Registers)(frameRegisterAndOffset & 15);
FrameOffset = (byte)(frameRegisterAndOffset >> 4);
UnwindCodes = new List <UnwindCode>(CountOfUnwindCodes);
CodeOffsetToUnwindCodeIndex = new Dictionary <int, int>();
int frameOffset = FrameOffset;
int sizeOfUnwindCodes = CountOfUnwindCodes * _sizeofUnwindCode;
int endOffset = offset + sizeOfUnwindCodes;
while (offset < endOffset)
{
UnwindCode unwindCode = new UnwindCode(image, ref frameOffset, ref offset);
CodeOffsetToUnwindCodeIndex.Add(unwindCode.CodeOffset, UnwindCodes.Count);
UnwindCodes.Add(unwindCode);
}
Size = _offsetofUnwindCode + sizeOfUnwindCodes;
int alignmentPad = -Size & 3;
Size += alignmentPad + sizeof(uint);
// Personality routine RVA must be at 4-aligned address
offset += alignmentPad;
PersonalityRoutineRVA = NativeReader.ReadUInt32(image, ref offset);
}
/// <summary>
/// based on <a href="https://github.com/dotnet/coreclr/blob/master/src/zap/zapcode.cpp">ZapUnwindData::Save</a>
/// </summary>
public UnwindInfo(byte[] image, int offset)
{
byte versionAndFlags = NativeReader.ReadByte(image, ref offset);
Version = (byte)(versionAndFlags & 7);
Flags = (byte)(versionAndFlags >> 3);
SizeOfProlog = NativeReader.ReadByte(image, ref offset);
CountOfUnwindCodes = NativeReader.ReadByte(image, ref offset);
byte frameRegisterAndOffset = NativeReader.ReadByte(image, ref offset);
FrameRegister = (Registers)(frameRegisterAndOffset & 15);
FrameOffset = (byte)(frameRegisterAndOffset >> 4);
UnwindCodeArray = new UnwindCode[CountOfUnwindCodes];
UnwindCodes = new Dictionary <int, UnwindCode>();
for (int i = 0; i < CountOfUnwindCodes; i++)
{
UnwindCodeArray[i] = new UnwindCode(image, i, ref offset);
}
for (int i = 0; i < CountOfUnwindCodes; i++)
{
ParseUnwindCode(ref i);
Debug.Assert(!UnwindCodes.ContainsKey(UnwindCodeArray[i].CodeOffset));
UnwindCodes.Add(UnwindCodeArray[i].CodeOffset, UnwindCodeArray[i]);
}
Size = _offsetofUnwindCode + CountOfUnwindCodes * _sizeofUnwindCode;
int alignmentPad = -Size & 3;
Size += alignmentPad + sizeof(uint);
// Personality routine RVA must be at 4-aligned address
offset += alignmentPad;
PersonalityRoutineRVA = NativeReader.ReadUInt32(image, ref offset);
}
/// <summary>
/// based on <a href="https://github.com/dotnet/coreclr/blob/master/src/jit/unwindamd64.cpp">src\jit\unwindamd64.cpp</a> DumpUnwindInfo
/// </summary>
private void ParseUnwindCode(ref int i)
{
UnwindCode code = UnwindCodeArray[i];
code.IsOpInfo = true;
switch (code.UnwindOp)
{
case UnwindOpCodes.UWOP_PUSH_NONVOL:
code.OpInfoStr = $"{(Registers)code.OpInfo}({code.OpInfo})";
break;
case UnwindOpCodes.UWOP_ALLOC_LARGE:
code.OpInfoStr = $"{code.OpInfo} - ";
if (code.OpInfo == 0)
{
i++;
UnwindCodeArray[i].OpInfoStr += "Scaled small";
code.NextFrameOffset = (int)UnwindCodeArray[i].FrameOffset * 8;
}
else if (code.OpInfo == 1)
{
i++;
UnwindCodeArray[i].OpInfoStr += "Unscaled large";
uint offset = UnwindCodeArray[i].FrameOffset;
i++;
offset = ((UnwindCodeArray[i].FrameOffset << 16) | offset);
code.NextFrameOffset = (int)offset;
}
else
{
code.OpInfoStr += "Unknown";
}
break;
case UnwindOpCodes.UWOP_ALLOC_SMALL:
int opInfo = code.OpInfo * 8 + 8;
code.OpInfoStr = $"{opInfo}";
break;
case UnwindOpCodes.UWOP_SET_FPREG:
code.OpInfoStr = $"Unused({code.OpInfo})";
break;
case UnwindOpCodes.UWOP_SET_FPREG_LARGE:
{
code.OpInfoStr = $"Unused({code.OpInfo})";
i++;
uint offset = UnwindCodeArray[i].FrameOffset;
i++;
offset = ((UnwindCodeArray[i].FrameOffset << 16) | offset);
code.NextFrameOffset = (int)offset * 16;
if ((UnwindCodeArray[i].FrameOffset & 0xF0000000) != 0)
{
// TODO (refactoring) - what should we do?
// R2RDump.WriteWarning("Illegal unwindInfo unscaled offset: too large");
}
}
break;
case UnwindOpCodes.UWOP_SAVE_NONVOL:
{
code.OpInfoStr = $"{(Registers)code.OpInfo}({code.OpInfo})";
i++;
uint offset = UnwindCodeArray[i].FrameOffset * 8;
code.NextFrameOffset = (int)offset;
}
break;
case UnwindOpCodes.UWOP_SAVE_NONVOL_FAR:
{
code.OpInfoStr = $"{(Registers)code.OpInfo}({code.OpInfo})";
i++;
uint offset = UnwindCodeArray[i].FrameOffset;
i++;
offset = ((UnwindCodeArray[i].FrameOffset << 16) | offset);
code.NextFrameOffset = (int)offset;
}
break;
case UnwindOpCodes.UWOP_SAVE_XMM128:
{
code.OpInfoStr = $"XMM{code.OpInfo}({code.OpInfo})";
i++;
uint offset = UnwindCodeArray[i].FrameOffset * 16;
code.NextFrameOffset = (int)offset;
}
break;
case UnwindOpCodes.UWOP_SAVE_XMM128_FAR:
{
code.OpInfoStr = $"XMM{code.OpInfo}({code.OpInfo})";
i++;
uint offset = UnwindCodeArray[i].FrameOffset;
i++;
offset = ((UnwindCodeArray[i].FrameOffset << 16) | offset);
code.NextFrameOffset = (int)offset;
}
break;
}
}
