/// <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)
{
var state = new RedirectCallsState();
// R11 is volatile.
unsafe
{
var 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)
{
// Called when placing/removing roads
// one of these also affects the combined LOD mesh
// NetLane.CalculateGroupData
// NetLane.PopulateGroupData
// NetLane.RereshInstance - init/render
// Called when rendering detailed net
// NetLane.RenderInstance - render
_NetLane_RefreshInstance_original = typeof(NetLane).GetMethod("RefreshInstance", BindingFlags.Instance | BindingFlags.Public);
_NetLane_RefreshInstance_detour = typeof(NetLaneDetour).GetMethod("RefreshInstance", BindingFlags.Instance | BindingFlags.Public);
_NetLane_RefreshInstance_state = RedirectionHelper.RedirectCalls(_NetLane_RefreshInstance_original, _NetLane_RefreshInstance_detour);
_NetLane_RenderInstance_original = typeof(NetLane).GetMethod("RenderInstance", BindingFlags.Instance | BindingFlags.Public);
_NetLane_RenderInstance_detour = typeof(NetLaneDetour).GetMethod("RenderInstance", BindingFlags.Instance | BindingFlags.Public);
_NetLane_RenderInstance_state = RedirectionHelper.RedirectCalls(_NetLane_RenderInstance_original, _NetLane_RenderInstance_detour);
_NetLane_CalculateGroupData_original = typeof(NetLane).GetMethod("CalculateGroupData", BindingFlags.Instance | BindingFlags.Public);
_NetLane_CalculateGroupData_detour = typeof(NetLaneDetour).GetMethod("CalculateGroupData", BindingFlags.Instance | BindingFlags.Public);
_NetLane_CalculateGroupData_state = RedirectionHelper.RedirectCalls(_NetLane_CalculateGroupData_original, _NetLane_CalculateGroupData_detour);
_NetLane_PopulateGroupData_original = typeof(NetLane).GetMethod("PopulateGroupData", BindingFlags.Instance | BindingFlags.Public);
_NetLane_PopulateGroupData_detour = typeof(NetLaneDetour).GetMethod("PopulateGroupData", BindingFlags.Instance | BindingFlags.Public);
_NetLane_PopulateGroupData_state = RedirectionHelper.RedirectCalls(_NetLane_PopulateGroupData_original, _NetLane_PopulateGroupData_detour);
deployed = true;
}
}
public static void Deploy()
{
if (deployed) return;
_RenderManager_UpdateData_original = typeof(RenderManager).GetMethod("UpdateData", BindingFlags.Instance | BindingFlags.Public);
_RenderManager_UpdateData_detour = typeof(RenderManagerDetour).GetMethod("UpdateData", BindingFlags.Instance | BindingFlags.Public);
_RenderManager_UpdateData_state = RedirectionHelper.RedirectCalls(_RenderManager_UpdateData_original, _RenderManager_UpdateData_detour);
deployed = true;
}
public static void Deploy()
{
if (!deployed)
{
_NetLane_RenderInstance_original = typeof(NetSegment).GetMethod("RenderInstance", BindingFlags.Instance | BindingFlags.NonPublic);
_NetLane_RenderInstance_detour = typeof(NetSegmentDetour).GetMethod("RenderInstance", BindingFlags.Instance | BindingFlags.NonPublic);
_NetLane_RenderInstance_state = RedirectionHelper.RedirectCalls(_NetLane_RenderInstance_original, _NetLane_RenderInstance_detour);
deployed = true;
}
}
public static void Deploy()
{
if (deployed) return;
_NetManager_CreateSegment_original = typeof(NetManager).GetMethod("CreateSegment", BindingFlags.Instance | BindingFlags.Public);
_NetManager_CreateSegment_detour = typeof(NetManagerDetour).GetMethod("CreateSegment", BindingFlags.Instance | BindingFlags.Public);
_NetManager_CreateSegment_state = RedirectionHelper.RedirectCalls(_NetManager_CreateSegment_original, _NetManager_CreateSegment_detour);
_NetManager_ReleaseSegment_original = typeof(NetManager).GetMethod("ReleaseSegment", BindingFlags.Instance | BindingFlags.Public);
_NetManager_ReleaseSegment_detour = typeof(NetManagerDetour).GetMethod("ReleaseSegment", BindingFlags.Instance | BindingFlags.Public);
_NetManager_ReleaseSegment_state = RedirectionHelper.RedirectCalls(_NetManager_ReleaseSegment_original, _NetManager_ReleaseSegment_detour);
deployed = true;
}
public static void RevertRedirect(MethodInfo from, RedirectCallsState state)
{
var fptr1 = from.MethodHandle.GetFunctionPointer();
RevertJumpTo(fptr1, state);
}
public static void RevertJumpTo(IntPtr site, RedirectCallsState state)
{
unsafe
{
var 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);
}
