crypto/s390xcap.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <setjmp.h>
   5 #include <signal.h>
   6
   7 extern unsigned long OPENSSL_s390xcap_P[];
   8
   9 static sigjmp_buf ill_jmp;
  10 static void ill_handler(int sig)
  11 {
  12     siglongjmp(ill_jmp, sig);
  13 }
  14
  15 unsigned long OPENSSL_s390x_facilities(void);
  16
  17 void OPENSSL_cpuid_setup(void)
  18 {
  19     sigset_t oset;
  20     struct sigaction ill_act, oact;
  21
  22     if (OPENSSL_s390xcap_P[0])
  23         return;
  24
  25     OPENSSL_s390xcap_P[0] = 1UL << (8 * sizeof(unsigned long) - 1);
  26
  27     memset(&ill_act, 0, sizeof(ill_act));
  28     ill_act.sa_handler = ill_handler;
  29     sigfillset(&ill_act.sa_mask);
  30     sigdelset(&ill_act.sa_mask, SIGILL);
  31     sigdelset(&ill_act.sa_mask, SIGTRAP);
  32     sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
  33     sigaction(SIGILL, &ill_act, &oact);
  34
  35     /* protection against missing store-facility-list-extended */
  36     if (sigsetjmp(ill_jmp, 1) == 0)
  37         OPENSSL_s390x_facilities();
  38
  39     sigaction(SIGILL, &oact, NULL);
  40     sigprocmask(SIG_SETMASK, &oset, NULL);
  41 }