/// <summary> /// Primitive patching. Inserts a jump to 'target' at 'site'. Works even if both methods' /// callers have already been compiled. /// </summary> /// <param name="site"></param> /// <param name="target"></param> public static RedirectCallsState PatchJumpTo(IntPtr site, IntPtr target) { RedirectCallsState state = new RedirectCallsState(); // R11 is volatile. unsafe { byte* sitePtr = (byte*)site.ToPointer(); state.a = *sitePtr; state.b = *(sitePtr + 1); state.c = *(sitePtr + 10); state.d = *(sitePtr + 11); state.e = *(sitePtr + 12); state.f = *((ulong*)(sitePtr + 2)); *sitePtr = 0x49; // mov r11, target *(sitePtr + 1) = 0xBB; *((ulong*)(sitePtr + 2)) = (ulong)target.ToInt64(); *(sitePtr + 10) = 0x41; // jmp r11 *(sitePtr + 11) = 0xFF; *(sitePtr + 12) = 0xE3; } return state; }
public static void Deploy() { if (_deployed) { return; } var tuple = RedirectionUtil.RedirectMethod(typeof(GameAreaManager), _detourInfo); _originalPtr = tuple.First.MethodHandle.GetFunctionPointer(); _detourPtr = _detourInfo.MethodHandle.GetFunctionPointer(); _state = tuple.Second; _deployed = true; }
public static void RevertJumpTo(IntPtr site, RedirectCallsState state) { unsafe { byte* sitePtr = (byte*)site.ToPointer(); *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; } }
public static void RevertRedirect(MethodInfo from, RedirectCallsState state) { var fptr1 = from.MethodHandle.GetFunctionPointer(); RevertJumpTo(fptr1, state); }
public static void RevertRedirect(MethodInfo from, RedirectCallsState state) { var fptr1 = from.MethodHandle.GetFunctionPointer(); RevertJumpTo(fptr1, state); }