A terrible abomination that disguises as syscalls for Win32

syscalls.c

LONG __stdcall handler(EXCEPTION_POINTERS * ExceptionInfo) {
	HMODULE library;
	FARPROC procedure;
	DWORD old_esp, return_adress;

	if (ExceptionInfo->ExceptionRecord->ExceptionCode != EXCEPTION_ILLEGAL_INSTRUCTION) {
		return 0;
	}

	library = (HMODULE)ExceptionInfo->ContextRecord->Eax;

	if (!library) {
		library = LoadLibraryA((LPCSTR)ExceptionInfo->ContextRecord->Ebx);
	}

	procedure = GetProcAddress(library, (LPCSTR)ExceptionInfo->ContextRecord->Esi);

	old_esp = ExceptionInfo->ContextRecord->Esp;
	return_adress = ExceptionInfo->ContextRecord->Ecx;

	__asm mov esi, procedure
	__asm mov eax, library
	__asm mov esp, old_esp
	__asm jmp return_adress

	return 1;
}

int main() {
	const char * libname = "kernel32.dll";
	const char * procname = "ExitProcess";

	SetUnhandledExceptionFilter(handler);

	__asm xor eax, eax;
	__asm mov ebx, libname;
	__asm mov esi, procname;
	__asm mov ecx, over;

	__asm ud2; // Tick! A syscall

	__asm over:
	__asm push 2137
	__asm call esi
}