#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/time.h>
#include <errno.h>

void f(int n)
{
        __asm__ __volatile__(
                "ldr r0, [%0]\n"
                "b 1f\n"
                "b 2f\n"
                "1:b .\n"
                "2:\n" : : "r"(&n));
}

void handler1(int sig) { }
void handler2(int sig) { raise(1); }
void handler3(int sig) { exit(0); }

main()
{
        struct sigaction s = {.sa_handler = handler2};
        struct itimerval t1 = { .it_value = {1} };
        struct itimerval t2 = { .it_value = {2} };

        signal(1, handler1);

        sigemptyset(&s.sa_mask);
        sigaddset(&s.sa_mask, 1);
        sigaction(SIGALRM, &s, NULL);

        signal(SIGVTALRM, handler3);

        setitimer(ITIMER_REAL, &t1, NULL);
        setitimer(ITIMER_VIRTUAL, &t2, NULL);

        f(-513); /* -ERESTARTNOINTR */

        write(1, "buggered\n", 9);
        return 1;
}