msvcrt: Implemented __CxxLongjmpUnwind.

dlls/msvcrt/cppexcept.c

@@ -469,3 +469,17 @@ unsigned int CDECL __CxxQueryExceptionSize(void)
 {
   return sizeof(cxx_exception_type);
 }
+
+/*********************************************************************
+ *		__CxxLongjmpUnwind (MSVCRT.@)
+ *
+ * Callback meant to be used as UnwindFunc for setjmp/longjmp.
+ */
+void __stdcall __CxxLongjmpUnwind( const struct MSVCRT___JUMP_BUFFER *buf )
+{
+    cxx_exception_frame *frame = (cxx_exception_frame *)buf->Registration;
+    const cxx_function_descr *descr = (const cxx_function_descr *)buf->UnwindData[0];
+
+    TRACE( "unwinding frame %p descr %p trylevel %ld\n", frame, descr, buf->TryLevel );
+    cxx_local_unwind( frame, descr, buf->TryLevel );
+}

dlls/msvcrt/except.c

@@ -259,7 +259,7 @@ int CDECL _abnormal_termination(void)
 
 #ifdef __i386__
 #define MSVCRT_JMP_MAGIC 0x56433230 /* ID value for new jump structure */
-typedef void (*MSVCRT_unwind_function)(const void*);
+typedef void (__stdcall *MSVCRT_unwind_function)(const struct MSVCRT___JUMP_BUFFER *);
 
 /* define an entrypoint for setjmp/setjmp3 that stores the registers in the jmp buf */
 /* and then jumps to the C backend function */

dlls/msvcrt/msvcrt.spec

@@ -76,7 +76,7 @@
 @ cdecl _Strftime(str long str ptr ptr)
 @ cdecl _XcptFilter(long ptr)
 @ cdecl -i386 -norelay __CxxFrameHandler(ptr ptr ptr ptr)
-@ stub __CxxLongjmpUnwind #(ptr) stdcall
+@ stdcall __CxxLongjmpUnwind(ptr)
 @ cdecl __RTCastToVoid(ptr) MSVCRT___RTCastToVoid
 @ cdecl __RTDynamicCast(ptr long ptr ptr long) MSVCRT___RTDynamicCast
 @ cdecl __RTtypeid(ptr) MSVCRT___RTtypeid