Method PropogateRegisterUpCallStack_ExceptionDirectory

IDEHelper/DebugTarget.cpp:1187–1420

We write the modified callerRegisters into the saved memory locations in the callee's stack frame -- this is needed for modifying variables tied to non-volatile registers on non-topmost stack frames

// We write the modified callerRegisters into the saved memory locations in the callee's stack frame --
//  this is needed for modifying variables tied to non-volatile registers on non-topmost stack frames
bool DebugTarget::PropogateRegisterUpCallStack_ExceptionDirectory(addr_target findPC, CPURegisters* callerRegisters, CPURegisters* calleeRegisters, void* regPtr, bool& wasSaved)
{
	addr_target pcAddress = calleeRegisters->GetPC();

	auto exceptionDirectoryEntry = mExceptionDirectoryMap.Get(findPC, DBG_MAX_LOOKBACK);
	if ((exceptionDirectoryEntry != NULL) && (findPC >= exceptionDirectoryEntry->mAddress) &&
		(findPC < exceptionDirectoryEntry->mAddress + exceptionDirectoryEntry->mAddressLength))
	{
		auto dbgModule = exceptionDirectoryEntry->mDbgModule;
		//const uint8* data = dbgModule->mExceptionData + exceptionDirectoryEntry->mExceptionPos;

		uint32 exceptionPos = exceptionDirectoryEntry->mExceptionPos;
		while ((exceptionPos & 1) != 0)
		{
			// It's a reference to another entry -- directly reference the 'exceptionPos' from that other entry
			dbgModule->mOrigImageData->Read(dbgModule->mImageBase + (exceptionPos & ~1) + 8, (uint8*)&exceptionPos, 4);
		}

		struct EntryHeader
		{
			uint8 mVersion;
			uint8 mPrologSize;
			uint8 mNumUnwindCodes;
			uint8 mFrameRegister;
		};

		EntryHeader entryHeader;

		dbgModule->mOrigImageData->Read(dbgModule->mImageBase + exceptionPos, (uint8*)&entryHeader, sizeof(EntryHeader));

		uint8 version = entryHeader.mVersion;
		uint8 flags = (version >> 3);
		version &= 7;

		int dataSize = entryHeader.mNumUnwindCodes * 2;

		if (flags & 4) // UNW_FLAG_CHAININFO
		{
			if ((entryHeader.mNumUnwindCodes % 2) == 1)
				dataSize += 2; // Align
			dataSize += sizeof(uint32)*3;
		}

		uint8 dataBuf[512];
		dbgModule->mOrigImageData->Read(dbgModule->mImageBase + exceptionPos + sizeof(EntryHeader), dataBuf, dataSize);
		const uint8* data = dataBuf;

		if (flags & 1) // UNW_FLAG_EHANDLER
		{
		}
		else if (flags & 4) // UNW_FLAG_CHAININFO
		{
		}

		/*if (pcAddress < exceptionDirectoryEntry->mAddress + prologSize)
		{
		// We're in the prolog so just do a standard leaf 'ret'
		return false;