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