Recrinkling...

a_1authrowhook.asm

@@ -3,8 +3,8 @@
 ; A/B/C:\... <  ntstc_msvcrt's d:\os\obj\...
 
 PUBLIC _CxxThrowException
-EXTERN _CxxThrowExceptionHook : proc
-EXTERN CXX_THROW_REFERENCE : qword
+EXTERN _SEHReport : proc
+EXTERN gGxxThrowRefDll : qword
 
 .code
 
@@ -15,16 +15,15 @@ _CxxThrowException PROC
     push RDX
     
     SUB RSP, 24 ; yo wtf, we have [0, -8], [-8, -8], [-16, -8] writes in our stack?! stdcall compiler optimizer conflicting with the reality that stdcall does not exist under x64?
-    MOV RAX, [_CxxThrowExceptionHook]
+    MOV RAX, [_SEHReport]
     CALL RAX
-    add rsp, 24
-    pop RDX
-    pop RCX
+    ADD RSP, 24
+    POP RDX
+    POP RCX
 
-    xor rax, rax
+    XOR RAX, RAX
 
-    jmp CXX_THROW_REFERENCE
-    ret 
+    JMP gGxxThrowRefDll
 _CxxThrowException ENDP
 
 END

demo.cpp

@@ -2,7 +2,7 @@
 #include <iostream>
 #include <ehdata.h>
 
-extern "C" size_t CXX_THROW_REFERENCE = 0xDEADBEEF;
+extern "C" size_t gGxxThrowRefDll = 0xDEADBEEF;
 
 static std::string kStringRawName = typeid(std::string).raw_name();
 
@@ -24,9 +24,10 @@ static bool IsReadable(const void *address)
 }
 
 #pragma warning(suppress : 4996)
-static bool DoMagic(void *exception, const ThrowInfo *throwInfo, void *caller)
+extern "C" void __stdcall _SEHReport(void *exception, const ThrowInfo *throwInfo, void *caller)
 {
-    if (!throwInfo) return false;
+    if (!throwInfo) return;
+    if (!exception) return;
 
     auto attribs = throwInfo->attributes;
 
@@ -91,27 +92,15 @@ static bool DoMagic(void *exception, const ThrowInfo *throwInfo, void *caller)
     {
         std::cout << message << std::endl;
     }
-
-    return true;
-}
-
-extern "C" void __stdcall _CxxThrowExceptionHook(
-    void *pExceptionObject,
-    void * pThrowInfo,
-    void *caller
-)
-{
-    DoMagic(pExceptionObject, (ThrowInfo *)pThrowInfo, caller);
 }
 
 int main()
 {
-    CXX_THROW_REFERENCE = (size_t)GetProcAddress(LoadLibraryW(L"ucrtbase.dll"), "_CxxThrowException");
+    gGxxThrowRefDll = (size_t)GetProcAddress(LoadLibraryW(L"ucrtbase.dll"), "_CxxThrowException");
     try
     {
         throw std::exception("hello");
         std::cout << "cont?!!\n";
-
     }
     catch (...)
     {