crypto/ppccap.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <setjmp.h>
   5 #include <signal.h>
   6 #include <openssl/bn.h>
   7
   8 #define PPC_FPU64       (1<<0)
   9
  10 static int OPENSSL_ppccap_P = 0;
  11
  12 static sigset_t all_masked;
  13
  14 #ifdef OPENSSL_BN_ASM_MONT
  15 int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, const BN_ULONG *np, const BN_ULONG *n0, int num)
  16         {
  17         int bn_mul_mont_fpu64(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, const BN_ULONG *np, const BN_ULONG *n0, int num);
  18         int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, const BN_ULONG *np, const BN_ULONG *n0, int num);
  19
  20         if (sizeof(size_t)==4)
  21                 {
  22 #if (defined(__APPLE__) && defined(__MACH__))
  23                 if ((OPENSSL_ppccap_P&PPC_FPU64))
  24                         return bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
  25 #else
  26                 /* boundary of 32 was experimentally determined on
  27                    Linux 2.6.22, might have to be adjusted on AIX... */
  28                 if ((num>=32) && (OPENSSL_ppccap_P&PPC_FPU64))
  29                         {
  30                         sigset_t oset;
  31                         int ret;
  32
  33                         sigprocmask(SIG_SETMASK,&all_masked,&oset);
  34                         ret=bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
  35                         sigprocmask(SIG_SETMASK,&oset,NULL);
  36
  37                         return ret;
  38                         }
  39 #endif
  40                 }
  41         else if ((OPENSSL_ppccap_P&PPC_FPU64))
  42                 /* this is a "must" on Power 6, but run-time detection
  43                  * is not implemented yet... */
  44                 return bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
  45
  46         return bn_mul_mont_int(rp,ap,bp,np,n0,num);
  47         }
  48 #endif
  49
  50 static sigjmp_buf ill_jmp;
  51 static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
  52
  53 void OPENSSL_cpuid_setup(void)
  54         {
  55         char *e;
  56
  57         sigfillset(&all_masked);
  58         sigdelset(&all_masked,SIGSEGV);
  59         sigdelset(&all_masked,SIGILL);
  60         sigdelset(&all_masked,SIGBUS);
  61         sigdelset(&all_masked,SIGFPE);
  62
  63         if ((e=getenv("OPENSSL_ppccap")))
  64                 {
  65                 OPENSSL_ppccap_P=strtoul(e,NULL,0);
  66                 return;
  67                 }
  68
  69         if (sizeof(size_t)==4)
  70                 {
  71                 struct sigaction        ill_oact,ill_act;
  72                 sigset_t                oset;
  73
  74                 memset(&ill_act,0,sizeof(ill_act));
  75                 ill_act.sa_handler = ill_handler;
  76                 ill_act.sa_mask    = all_masked;
  77                 sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
  78                 sigaction (SIGILL,&ill_act,&ill_oact);
  79                 if (sigsetjmp(ill_jmp,0) == 0)
  80                         {
  81                         OPENSSL_ppc64_probe();
  82                         OPENSSL_ppccap_P |= PPC_FPU64;
  83                         }
  84                 else
  85                         {
  86                         OPENSSL_ppccap_P &= ~PPC_FPU64;
  87                         }
  88                 sigaction (SIGILL,&ill_oact,NULL);
  89                 sigprocmask(SIG_SETMASK,&oset,NULL);
  90                 }
  91         }