Create a thread for exception handler for separate stack

src/CMakeData-os.cmake

@@ -57,11 +57,6 @@ else()
                 "archutils/Win32/WindowsDialogBox.cpp"
                 "archutils/Win32/WindowsResources.rc")
 
-    if(MSVC AND SM_WIN32_ARCH MATCHES "x64")
-      enable_language(ASM_MASM)
-      list(APPEND SMDATA_OS_SRC "archutils/Win32/ExceptionHandler_x64.asm")
-    endif()
-
     list(APPEND SMDATA_OS_HPP
                 "archutils/Win32/AppInstance.h"
                 "archutils/Win32/arch_setup.h"

src/archutils/Win32/Crash.cpp

@@ -266,7 +266,7 @@ void RunChild()
 	}
 }
 
-/* static */ long MainExceptionHandler( EXCEPTION_POINTERS *pExc )
+static DWORD WINAPI MainExceptionHandler( LPVOID lpParameter )
 {
 	// Flush the log so it isn't cut off at the end.
 	/* 1. We can't do regular file access in the crash handler.
@@ -283,6 +283,7 @@ void RunChild()
 	 * does this exception occur, and we never unmask it.
 	 * However, once in a while some driver or library turns evil and unmasks an
 	 * exception flag on us. If this happens, re-mask it and continue execution. */
+	PEXCEPTION_POINTERS pExc = reinterpret_cast<PEXCEPTION_POINTERS>(lpParameter);
 	switch( pExc->ExceptionRecord->ExceptionCode )
 	{
 	case EXCEPTION_FLT_INVALID_OPERATION:
@@ -360,26 +361,25 @@ void RunChild()
 	return EXCEPTION_EXECUTE_HANDLER;
 }
 
-#if !_WIN64
 long __stdcall CrashHandler::ExceptionHandler( EXCEPTION_POINTERS *pExc )
 {
 	/* If the stack overflowed, we have a very limited amount of stack space.
 	 * Allocate a new stack, and run the exception handler in it, to increase
 	 * the chances of success. */
-	static BYTE new_stack[0x8000];
-	LPBYTE pStack = new_stack + 0x8000;
-#if defined(_MSC_VER)
-	_asm mov esp, pStack;
-#elif defined(__GNUC__)
-	asm volatile ("movl %%esp, %0\n\t"
-	:
-	: "r" (pStack)
-	);
-#endif
+	HANDLE hExceptionHandler = CreateThread(nullptr, 1024 * 32, MainExceptionHandler, reinterpret_cast<LPVOID>(pExc), 0, nullptr);
+	if (hExceptionHandler == NULL)
+	{
+		TerminateProcess(GetCurrentProcess(), 0);
+		return EXCEPTION_EXECUTE_HANDLER;
+	}
+	WaitForSingleObject(hExceptionHandler, INFINITE);
 
-	return MainExceptionHandler( pExc );
+	DWORD ret;
+	GetExitCodeThread(hExceptionHandler, &ret);
+	CloseHandle(hExceptionHandler);
+
+	return static_cast<long>(ret);
 }
-#endif
 
 //////////////////////////////////////////////////////////////////////////////
 

src/archutils/Win32/ExceptionHandler_x64.asm

@@ -1,20 +0,0 @@
-extrn ?MainExceptionHandler@@YAJPEAU_EXCEPTION_POINTERS@@@Z : PROC
-
-.data
-
-pStack db 8000h dup(?) ; Allocate a new stack
-
-.code
-
-; long __stdcall CrashHandler::ExceptionHandler( EXCEPTION_POINTERS *pExc );
-?ExceptionHandler@CrashHandler@@YAJPEAU_EXCEPTION_POINTERS@@@Z PROC
-
-push rsp
-lea rsp, offset pStack + 7FE0h ; Reserve register parameter stack area for RCX, RDX, R8 and R9
-call ?MainExceptionHandler@@YAJPEAU_EXCEPTION_POINTERS@@@Z
-pop rsp
-ret
-
-?ExceptionHandler@CrashHandler@@YAJPEAU_EXCEPTION_POINTERS@@@Z ENDP
-
-END