relay_signal
extern void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs,
[SIGTRAP] = relay_signal,
[SIGFPE] = relay_signal,
[SIGILL] = relay_signal,
[SIGBUS] = relay_signal,
relay_signal(SIGTRAP, (struct siginfo *)si, regs, NULL);