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=0;
  11
  12 #if __ARM_MAX_ARCH__<7
  13 void OPENSSL_cpuid_setup(void) {}
  14 unsigned long OPENSSL_rdtsc(void) { return 0; }
  15 #else
  16 static sigset_t all_masked;
  17
  18 static sigjmp_buf ill_jmp;
  19 static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
  20
  21 /*
  22  * Following subroutines could have been inlined, but it's not all
  23  * ARM compilers support inline assembler...
  24  */
  25 void _armv7_neon_probe(void);
  26 void _armv8_aes_probe(void);
  27 void _armv8_sha1_probe(void);
  28 void _armv8_sha256_probe(void);
  29 void _armv8_pmull_probe(void);
  30 unsigned long _armv7_tick(void);
  31
  32 unsigned long OPENSSL_rdtsc(void)
  33         {
  34         if (OPENSSL_armcap_P & ARMV7_TICK)
  35                 return _armv7_tick();
  36         else
  37                 return 0;
  38         }
  39
  40 /*
  41  * Use a weak reference to getauxval() so we can use it if it is available but
  42  * don't break the build if it is not.
  43  */
  44 #if defined(__GNUC__) && __GNUC__>=2
  45 void OPENSSL_cpuid_setup(void) __attribute__((constructor));
  46 extern unsigned long getauxval(unsigned long type) __attribute__((weak));
  47 #else
  48 static unsigned long (*getauxval)(unsigned long) = NULL;
  49 #endif
  50
  51 /*
  52  * ARM puts the the feature bits for Crypto Extensions in AT_HWCAP2, whereas
  53  * AArch64 used AT_HWCAP.
  54  */
  55 #if defined(__arm__) || defined (__arm)
  56 # define HWCAP                  16      /* AT_HWCAP */
  57 # define HWCAP_NEON             (1 << 12)
  58
  59 # define HWCAP_CE               26      /* AT_HWCAP2 */
  60 # define HWCAP_CE_AES           (1 << 0)
  61 # define HWCAP_CE_PMULL         (1 << 1)
  62 # define HWCAP_CE_SHA1          (1 << 2)
  63 # define HWCAP_CE_SHA256        (1 << 3)
  64 #elif defined(__aarch64__)
  65 # define HWCAP                  16      /* AT_HWCAP */
  66 # define HWCAP_NEON             (1 << 1)
  67
  68 # define HWCAP_CE               HWCAP
  69 # define HWCAP_CE_AES           (1 << 3)
  70 # define HWCAP_CE_PMULL         (1 << 4)
  71 # define HWCAP_CE_SHA1          (1 << 5)
  72 # define HWCAP_CE_SHA256        (1 << 6)
  73 #endif
  74
  75 void OPENSSL_cpuid_setup(void)
  76         {
  77         char *e;
  78         struct sigaction        ill_oact,ill_act;
  79         sigset_t                oset;
  80         static int trigger=0;
  81
  82         if (trigger) return;
  83         trigger=1;
  84
  85         if ((e=getenv("OPENSSL_armcap")))
  86                 {
  87                 OPENSSL_armcap_P=(unsigned int)strtoul(e,NULL,0);
  88                 return;
  89                 }
  90
  91         sigfillset(&all_masked);
  92         sigdelset(&all_masked,SIGILL);
  93         sigdelset(&all_masked,SIGTRAP);
  94         sigdelset(&all_masked,SIGFPE);
  95         sigdelset(&all_masked,SIGBUS);
  96         sigdelset(&all_masked,SIGSEGV);
  97
  98         OPENSSL_armcap_P = 0;
  99
 100         memset(&ill_act,0,sizeof(ill_act));
 101         ill_act.sa_handler = ill_handler;
 102         ill_act.sa_mask    = all_masked;
 103
 104         sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
 105         sigaction(SIGILL,&ill_act,&ill_oact);
 106
 107         if (getauxval != NULL)
 108                 {
 109                 if (getauxval(HWCAP) & HWCAP_NEON)
 110                         {
 111                         unsigned long hwcap = getauxval(HWCAP_CE);
 112
 113                         OPENSSL_armcap_P |= ARMV7_NEON;
 114
 115                         if (hwcap & HWCAP_CE_AES)
 116                                 OPENSSL_armcap_P |= ARMV8_AES;
 117
 118                         if (hwcap & HWCAP_CE_PMULL)
 119                                 OPENSSL_armcap_P |= ARMV8_PMULL;
 120
 121                         if (hwcap & HWCAP_CE_SHA1)
 122                                 OPENSSL_armcap_P |= ARMV8_SHA1;
 123
 124                         if (hwcap & HWCAP_CE_SHA256)
 125                                 OPENSSL_armcap_P |= ARMV8_SHA256;
 126                         }
 127                 }
 128         else if (sigsetjmp(ill_jmp,1) == 0)
 129                 {
 130                 _armv7_neon_probe();
 131                 OPENSSL_armcap_P |= ARMV7_NEON;
 132                 if (sigsetjmp(ill_jmp,1) == 0)
 133                         {
 134                         _armv8_pmull_probe();
 135                         OPENSSL_armcap_P |= ARMV8_PMULL|ARMV8_AES;
 136                         }
 137                 else if (sigsetjmp(ill_jmp,1) == 0)
 138                         {
 139                         _armv8_aes_probe();
 140                         OPENSSL_armcap_P |= ARMV8_AES;
 141                         }
 142                 if (sigsetjmp(ill_jmp,1) == 0)
 143                         {
 144                         _armv8_sha1_probe();
 145                         OPENSSL_armcap_P |= ARMV8_SHA1;
 146                         }
 147                 if (sigsetjmp(ill_jmp,1) == 0)
 148                         {
 149                         _armv8_sha256_probe();
 150                         OPENSSL_armcap_P |= ARMV8_SHA256;
 151                         }
 152                 }
 153         if (sigsetjmp(ill_jmp,1) == 0)
 154                 {
 155                 _armv7_tick();
 156                 OPENSSL_armcap_P |= ARMV7_TICK;
 157                 }
 158
 159         sigaction (SIGILL,&ill_oact,NULL);
 160         sigprocmask(SIG_SETMASK,&oset,NULL);
 161         }
 162 #endif