#define __SYSCALL_LL_E(x) \
((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
((union { long long ll; long l[2]; }){ .ll = x }).l[1]
-#define __SYSCALL_LL_O(x) __SYSCALL_LL_E((x))
+#define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
+
+#define __SYSCALL_SSLEN 16
long (__syscall)(long, ...);