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s390xcap.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <signal.h>

extern unsigned long OPENSSL_s390xcap_P;

static sigjmp_buf ill_jmp;
static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }

unsigned long OPENSSL_s390x_facilities(void);

void OPENSSL_cpuid_setup(void)
      {
      sigset_t oset;
      struct sigaction ill_act,oact;

      if (OPENSSL_s390xcap_P) return;

      memset(&ill_act,0,sizeof(ill_act));
      ill_act.sa_handler = ill_handler;
      sigfillset(&ill_act.sa_mask);
      sigdelset(&ill_act.sa_mask,SIGILL);
      sigdelset(&ill_act.sa_mask,SIGTRAP);
      sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
      sigaction (SIGILL,&ill_act,&oact);

      /* protection against missing store-facility-list-extended */
      if (sigsetjmp(ill_jmp,0) == 0)
            OPENSSL_s390xcap_P = OPENSSL_s390x_facilities();
      else
            OPENSSL_s390xcap_P = 1UL<<63;

      sigaction (SIGILL,&oact,NULL);
      sigprocmask(SIG_SETMASK,&oset,NULL);
      }

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