fc_debug
void fc_debug(char *, uintptr_t, uintptr_t,
fc_debug(s, 0, 0, 0, 0, 0)
fc_debug(fmt, (uintptr_t)(a1), 0, 0, 0, 0);
fc_debug(fmt, (uintptr_t)(a1), (uintptr_t)(a2), 0, 0, 0);
fc_debug(fmt, (uintptr_t)(a1), (uintptr_t)(a2), (uintptr_t)(a3), 0, 0);