crypto/armcap.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <setjmp.h>
   5 #include <signal.h>
   6 #include <crypto.h>
   7
   8 #include "arm_arch.h"
   9
  10 unsigned int OPENSSL_armcap_P;
  11
  12 static sigset_t all_masked;
  13
  14 static sigjmp_buf ill_jmp;
  15 static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
  16
  17 /*
  18  * Following subroutines could have been inlined, but it's not all
  19  * ARM compilers support inline assembler...
  20  */
  21 void _armv7_neon_probe(void);
  22 unsigned int _armv7_tick(void);
  23
  24 unsigned int OPENSSL_rdtsc(void)
  25         {
  26         if (OPENSSL_armcap_P|ARMV7_TICK)
  27                 return _armv7_tick();
  28         else
  29                 return 0;
  30         }
  31
  32 void OPENSSL_cpuid_setup(void)
  33         {
  34         char *e;
  35         struct sigaction        ill_oact,ill_act;
  36         sigset_t                oset;
  37         static int trigger=0;
  38
  39         if (trigger) return;
  40         trigger=1;
  41
  42         if ((e=getenv("OPENSSL_armcap")))
  43                 {
  44                 OPENSSL_armcap_P=strtoul(e,NULL,0);
  45                 return;
  46                 }
  47
  48         sigfillset(&all_masked);
  49         sigdelset(&all_masked,SIGILL);
  50         sigdelset(&all_masked,SIGTRAP);
  51         sigdelset(&all_masked,SIGFPE);
  52         sigdelset(&all_masked,SIGBUS);
  53         sigdelset(&all_masked,SIGSEGV);
  54
  55         OPENSSL_armcap_P = 0;
  56
  57         memset(&ill_act,0,sizeof(ill_act));
  58         ill_act.sa_handler = ill_handler;
  59         ill_act.sa_mask    = all_masked;
  60
  61         sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
  62         sigaction(SIGILL,&ill_act,&ill_oact);
  63
  64         if (sigsetjmp(ill_jmp,1) == 0)
  65                 {
  66                 _armv7_neon_probe();
  67                 OPENSSL_armcap_P |= ARMV7_NEON;
  68                 }
  69         if (sigsetjmp(ill_jmp,1) == 0)
  70                 {
  71                 _armv7_tick();
  72                 OPENSSL_armcap_P |= ARMV7_TICK;
  73                 }
  74
  75         sigaction (SIGILL,&ill_oact,NULL);
  76         sigprocmask(SIG_SETMASK,&oset,NULL);
  77         }