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 {
  15 }
  16
  17 unsigned long OPENSSL_rdtsc(void)
  18 {
  19     return 0;
  20 }
  21 #else
  22 static sigset_t all_masked;
  23
  24 static sigjmp_buf ill_jmp;
  25 static void ill_handler(int sig)
  26 {
  27     siglongjmp(ill_jmp, sig);
  28 }
  29
  30 /*
  31  * Following subroutines could have been inlined, but it's not all
  32  * ARM compilers support inline assembler...
  33  */
  34 void _armv7_neon_probe(void);
  35 void _armv8_aes_probe(void);
  36 void _armv8_sha1_probe(void);
  37 void _armv8_sha256_probe(void);
  38 void _armv8_pmull_probe(void);
  39 unsigned long _armv7_tick(void);
  40
  41 unsigned long OPENSSL_rdtsc(void)
  42 {
  43     if (OPENSSL_armcap_P & ARMV7_TICK)
  44         return _armv7_tick();
  45     else
  46         return 0;
  47 }
  48
  49 /*
  50  * Use a weak reference to getauxval() so we can use it if it is available but
  51  * don't break the build if it is not.
  52  */
  53 # if defined(__GNUC__) && __GNUC__>=2
  54 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
  55 extern unsigned long getauxval(unsigned long type) __attribute__ ((weak));
  56 # else
  57 static unsigned long (*getauxval) (unsigned long) = NULL;
  58 # endif
  59
  60 /*
  61  * ARM puts the the feature bits for Crypto Extensions in AT_HWCAP2, whereas
  62  * AArch64 used AT_HWCAP.
  63  */
  64 # if defined(__arm__) || defined (__arm)
  65 #  define HWCAP                  16
  66                                   /* AT_HWCAP */
  67 #  define HWCAP_NEON             (1 << 12)
  68
  69 #  define HWCAP_CE               26
  70                                   /* AT_HWCAP2 */
  71 #  define HWCAP_CE_AES           (1 << 0)
  72 #  define HWCAP_CE_PMULL         (1 << 1)
  73 #  define HWCAP_CE_SHA1          (1 << 2)
  74 #  define HWCAP_CE_SHA256        (1 << 3)
  75 # elif defined(__aarch64__)
  76 #  define HWCAP                  16
  77                                   /* AT_HWCAP */
  78 #  define HWCAP_NEON             (1 << 1)
  79
  80 #  define HWCAP_CE               HWCAP
  81 #  define HWCAP_CE_AES           (1 << 3)
  82 #  define HWCAP_CE_PMULL         (1 << 4)
  83 #  define HWCAP_CE_SHA1          (1 << 5)
  84 #  define HWCAP_CE_SHA256        (1 << 6)
  85 # endif
  86
  87 void OPENSSL_cpuid_setup(void)
  88 {
  89     char *e;
  90     struct sigaction ill_oact, ill_act;
  91     sigset_t oset;
  92     static int trigger = 0;
  93
  94     if (trigger)
  95         return;
  96     trigger = 1;
  97
  98     if ((e = getenv("OPENSSL_armcap"))) {
  99         OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
 100         return;
 101     }
 102
 103     sigfillset(&all_masked);
 104     sigdelset(&all_masked, SIGILL);
 105     sigdelset(&all_masked, SIGTRAP);
 106     sigdelset(&all_masked, SIGFPE);
 107     sigdelset(&all_masked, SIGBUS);
 108     sigdelset(&all_masked, SIGSEGV);
 109
 110     OPENSSL_armcap_P = 0;
 111
 112     memset(&ill_act, 0, sizeof(ill_act));
 113     ill_act.sa_handler = ill_handler;
 114     ill_act.sa_mask = all_masked;
 115
 116     sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
 117     sigaction(SIGILL, &ill_act, &ill_oact);
 118
 119     if (getauxval != NULL) {
 120         if (getauxval(HWCAP) & HWCAP_NEON) {
 121             unsigned long hwcap = getauxval(HWCAP_CE);
 122
 123             OPENSSL_armcap_P |= ARMV7_NEON;
 124
 125             if (hwcap & HWCAP_CE_AES)
 126                 OPENSSL_armcap_P |= ARMV8_AES;
 127
 128             if (hwcap & HWCAP_CE_PMULL)
 129                 OPENSSL_armcap_P |= ARMV8_PMULL;
 130
 131             if (hwcap & HWCAP_CE_SHA1)
 132                 OPENSSL_armcap_P |= ARMV8_SHA1;
 133
 134             if (hwcap & HWCAP_CE_SHA256)
 135                 OPENSSL_armcap_P |= ARMV8_SHA256;
 136         }
 137     } else if (sigsetjmp(ill_jmp, 1) == 0) {
 138         _armv7_neon_probe();
 139         OPENSSL_armcap_P |= ARMV7_NEON;
 140         if (sigsetjmp(ill_jmp, 1) == 0) {
 141             _armv8_pmull_probe();
 142             OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
 143         } else if (sigsetjmp(ill_jmp, 1) == 0) {
 144             _armv8_aes_probe();
 145             OPENSSL_armcap_P |= ARMV8_AES;
 146         }
 147         if (sigsetjmp(ill_jmp, 1) == 0) {
 148             _armv8_sha1_probe();
 149             OPENSSL_armcap_P |= ARMV8_SHA1;
 150         }
 151         if (sigsetjmp(ill_jmp, 1) == 0) {
 152             _armv8_sha256_probe();
 153             OPENSSL_armcap_P |= ARMV8_SHA256;
 154         }
 155     }
 156     if (sigsetjmp(ill_jmp, 1) == 0) {
 157         _armv7_tick();
 158         OPENSSL_armcap_P |= ARMV7_TICK;
 159     }
 160
 161     sigaction(SIGILL, &ill_oact, NULL);
 162     sigprocmask(SIG_SETMASK, &oset, NULL);
 163 }
 164 #endif