From 2854e1fe03f847e39857b14c3efa8b4162c7a525 Mon Sep 17 00:00:00 2001
From: Magnus Norddahl <dpjudas@users.noreply.github.com>
Date: Thu, 8 Dec 2016 13:07:52 +0100
Subject: [PATCH] Fix crash reporter for 64 bit

(cherry picked from commit 3a0de8b0c714507823edaa24875bc97b39c76ab6)
---
 src/win32/i_main.cpp | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/src/win32/i_main.cpp b/src/win32/i_main.cpp
index db92467bc3..0931aff99a 100644
--- a/src/win32/i_main.cpp
+++ b/src/win32/i_main.cpp
@@ -1184,6 +1184,11 @@ void CALLBACK ExitFatally (ULONG_PTR dummy)
 //
 //==========================================================================
 
+namespace
+{
+	CONTEXT MainThreadContext;
+}
+
 LONG WINAPI CatchAllExceptions (LPEXCEPTION_POINTERS info)
 {
 #ifdef _DEBUG
@@ -1208,11 +1213,7 @@ LONG WINAPI CatchAllExceptions (LPEXCEPTION_POINTERS info)
 	// Otherwise, put the crashing thread to sleep and signal the main thread to clean up.
 	if (GetCurrentThreadId() == MainThreadID)
 	{
-#ifndef _M_X64
-		info->ContextRecord->Eip = (DWORD_PTR)ExitFatally;
-#else
-		info->ContextRecord->Rip = (DWORD_PTR)ExitFatally;
-#endif
+		*info->ContextRecord = MainThreadContext;
 	}
 	else
 	{
@@ -1304,6 +1305,15 @@ int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE nothing, LPSTR cmdline, int n
 	if (MainThread != INVALID_HANDLE_VALUE)
 	{
 		SetUnhandledExceptionFilter (CatchAllExceptions);
+
+		static bool setJumpResult = false;
+		RtlCaptureContext(&MainThreadContext);
+		if (setJumpResult)
+		{
+			ExitFatally(0);
+			return 0;
+		}
+		setJumpResult = true;
 	}
 #endif