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