Breakpoint Hooking Problem

Join Date: Sep 2009

Posts: 4

Mhh hab den Fehler noch etwas eingrenzen können...

Es betrifft nur die letzten beiden Register:

TEXT Code:

// Register #3
	ctx.Dr2 = 0x4003000; //gBreakPoints.bp[2].dwAddr;
	ctx.Dr7 |= 0x00000010;
 
	// Register #4
	ctx.Dr3 = 0x4004000; //gBreakPoints.bp[3].dwAddr;
	ctx.Dr7 |= 0x00000040;	// todo: dynamic loop here

Wenn ich, wie oben schon getan, manuell eine Addresse einsetze, dann freezt das Spiel nicht.

Die Funktion welche die Addressen setzt sieht folgendermaßen aus:

TEXT Code:

 
bool bpInitialize(breakpoints_t *pBreakPoints)
{
	memcpy(&gBreakPoints, pBreakPoints, sizeof(gBreakPoints));
 
	if (gBreakPoints.hThread == NULL)
		gBreakPoints.hThread = GetCurrentThread();
 
	for (int i = 0; i < 4; i++)
	{
		if (*(gBreakPoints.bp[i].pSystemFunction) != NULL)
			continue;
 
		gBreakPoints.bp[i].dwAddr = gBreakPoints.bp[i].dwFunctionAddr;
 
		// length of opcode + 0x5
		size_t sStubSize = oplen((BYTE *)gBreakPoints.bp[i].dwAddr);
		*(gBreakPoints.bp[i].pSystemFunction) = malloc((sStubSize + 0x5));
 
 
		// copy the opcodes to the buffer
		memcpy(*(gBreakPoints.bp[i].pSystemFunction), (PVOID)gBreakPoints.bp[i].dwAddr, sStubSize);
 
		// add a jmp instruction to the original system function at the end of the buffer
		*(PBYTE)((DWORD)*(gBreakPoints.bp[i].pSystemFunction) + (DWORD)sStubSize) = 0xE9;
		*(PDWORD)((DWORD)*(gBreakPoints.bp[i].pSystemFunction) + (DWORD)sStubSize + 0x1) = (((DWORD)gBreakPoints.bp[i].dwAddr + (DWORD)sStubSize) - ((DWORD)*(gBreakPoints.bp[i].pSystemFunction) + (DWORD)sStubSize + 0x5));
 
	}
 
	if (pExceptionHandler == NULL)
		pExceptionHandler = AddVectoredExceptionHandler(1, ExceptionHandler);
	return true;
}