crypto/s390xcap.c

   1 /*
   2  * Copyright 2010-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <setjmp.h>
  14 #include <signal.h>
  15 #include "internal/cryptlib.h"
  16
  17 extern unsigned long OPENSSL_s390xcap_P[];
  18
  19 static sigjmp_buf ill_jmp;
  20 static void ill_handler(int sig)
  21 {
  22     siglongjmp(ill_jmp, sig);
  23 }
  24
  25 unsigned long OPENSSL_s390x_facilities(void);
  26
  27 void OPENSSL_cpuid_setup(void)
  28 {
  29     sigset_t oset;
  30     struct sigaction ill_act, oact;
  31
  32     if (OPENSSL_s390xcap_P[0])
  33         return;
  34
  35     OPENSSL_s390xcap_P[0] = 1UL << (8 * sizeof(unsigned long) - 1);
  36
  37     memset(&ill_act, 0, sizeof(ill_act));
  38     ill_act.sa_handler = ill_handler;
  39     sigfillset(&ill_act.sa_mask);
  40     sigdelset(&ill_act.sa_mask, SIGILL);
  41     sigdelset(&ill_act.sa_mask, SIGTRAP);
  42     sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
  43     sigaction(SIGILL, &ill_act, &oact);
  44
  45     /* protection against missing store-facility-list-extended */
  46     if (sigsetjmp(ill_jmp, 1) == 0)
  47         OPENSSL_s390x_facilities();
  48
  49     sigaction(SIGILL, &oact, NULL);
  50     sigprocmask(SIG_SETMASK, &oset, NULL);
  51 }