public static RedirectCallsState RevertJumpTo(IntPtr site, RedirectCallsState state)
{
RedirectCallsState detourState;
unsafe
{
byte* sitePtr = (byte*)site.ToPointer();
detourState = GetState(sitePtr);
*sitePtr = state.a; // mov r11, target
*(sitePtr + 1) = state.b;
*((ulong*)(sitePtr + 2)) = state.f;
*(sitePtr + 10) = state.c; // jmp r11
*(sitePtr + 11) = state.d;
*(sitePtr + 12) = state.e;
}
return detourState;
}
private static unsafe RedirectCallsState GetState(byte* sitePtr)
{
var state = new RedirectCallsState
{
a = *sitePtr,
b = *(sitePtr + 1),
c = *(sitePtr + 10),
d = *(sitePtr + 11),
e = *(sitePtr + 12),
f = *((ulong*) (sitePtr + 2))
};
return state;
}
public static void RevertRedirect(MethodInfo from, RedirectCallsState state)
{
var fptr1 = from.MethodHandle.GetFunctionPointer();
RevertJumpTo(fptr1, state);
}
