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 <unistd.h>
   7 #if defined(__linux) || defined(_AIX)
   8 #include <sys/utsname.h>
   9 #endif
  10 #include <crypto.h>
  11 #include <openssl/bn.h>
  12
  13 #define PPC_FPU64       (1<<0)
  14 #define PPC_ALTIVEC     (1<<1)
  15
  16 static int OPENSSL_ppccap_P = 0;
  17
  18 static sigset_t all_masked;
  19
  20 #ifdef OPENSSL_BN_ASM_MONT
  21 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)
  22         {
  23         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);
  24         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);
  25
  26         if (sizeof(size_t)==4)
  27                 {
  28 #if (defined(__APPLE__) && defined(__MACH__))
  29                 if (num>=8 && (num&3)==0 && (OPENSSL_ppccap_P&PPC_FPU64))
  30                         return bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
  31 #else
  32                 /* boundary of 32 was experimentally determined on
  33                    Linux 2.6.22, might have to be adjusted on AIX... */
  34                 if (num>=32 && (num&3)==0 && (OPENSSL_ppccap_P&PPC_FPU64))
  35                         {
  36                         sigset_t oset;
  37                         int ret;
  38
  39                         sigprocmask(SIG_SETMASK,&all_masked,&oset);
  40                         ret=bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
  41                         sigprocmask(SIG_SETMASK,&oset,NULL);
  42
  43                         return ret;
  44                         }
  45 #endif
  46                 }
  47         else if ((OPENSSL_ppccap_P&PPC_FPU64))
  48                 /* this is a "must" on POWER6, but run-time detection
  49                  * is not implemented yet... */
  50                 return bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
  51
  52         return bn_mul_mont_int(rp,ap,bp,np,n0,num);
  53         }
  54 #endif
  55
  56 static sigjmp_buf ill_jmp;
  57 static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
  58
  59 void OPENSSL_ppc64_probe(void);
  60 void OPENSSL_altivec_probe(void);
  61
  62 void OPENSSL_cpuid_setup(void)
  63         {
  64         char *e;
  65         struct sigaction        ill_oact,ill_act;
  66         sigset_t                oset;
  67         static int trigger=0;
  68
  69         if (trigger) return;
  70         trigger=1;
  71
  72         sigfillset(&all_masked);
  73         sigdelset(&all_masked,SIGILL);
  74         sigdelset(&all_masked,SIGTRAP);
  75 #ifdef SIGEMT
  76         sigdelset(&all_masked,SIGEMT);
  77 #endif
  78         sigdelset(&all_masked,SIGFPE);
  79         sigdelset(&all_masked,SIGBUS);
  80         sigdelset(&all_masked,SIGSEGV);
  81
  82         if ((e=getenv("OPENSSL_ppccap")))
  83                 {
  84                 OPENSSL_ppccap_P=strtoul(e,NULL,0);
  85                 return;
  86                 }
  87
  88         OPENSSL_ppccap_P = 0;
  89
  90 #if defined(_AIX)
  91         if (sizeof(size_t)==4)
  92                 {
  93                 struct utsname uts;
  94 # if defined(_SC_AIX_KERNEL_BITMODE)
  95                 if (sysconf(_SC_AIX_KERNEL_BITMODE)!=64)        return;
  96 # endif
  97                 if (uname(&uts)!=0 || atoi(uts.version)<6))     return;
  98                 }
  99 #endif
 100
 101         memset(&ill_act,0,sizeof(ill_act));
 102         ill_act.sa_handler = ill_handler;
 103         ill_act.sa_mask    = all_masked;
 104
 105         sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
 106         sigaction(SIGILL,&ill_act,&ill_oact);
 107
 108         if (sizeof(size_t)==4)
 109                 {
 110 #ifdef __linux
 111                 struct utsname uts;
 112                 if (uname(&uts)==0 && strcmp(uts.machine,"ppc64")==0)
 113 #endif
 114                 if (sigsetjmp(ill_jmp,1) == 0)
 115                         {
 116                         OPENSSL_ppc64_probe();
 117                         OPENSSL_ppccap_P |= PPC_FPU64;
 118                         }
 119                 }
 120         else
 121                 {
 122                 /*
 123                  * Wanted code detecting POWER6 CPU and setting PPC_FPU64
 124                  */
 125                 }
 126
 127         if (sigsetjmp(ill_jmp,1) == 0)
 128                 {
 129                 OPENSSL_altivec_probe();
 130                 OPENSSL_ppccap_P |= PPC_ALTIVEC;
 131                 }
 132
 133         sigaction (SIGILL,&ill_oact,NULL);
 134         sigprocmask(SIG_SETMASK,&oset,NULL);
 135         }