crypto/armcap.c

   1 /*
   2  * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <setjmp.h>
  14 #include <signal.h>
  15 #include <openssl/crypto.h>
  16 #ifdef __APPLE__
  17 #include <sys/sysctl.h>
  18 #endif
  19 #include "internal/cryptlib.h"
  20 #include <unistd.h>
  21
  22 #include "arm_arch.h"
  23
  24 unsigned int OPENSSL_armcap_P = 0;
  25 unsigned int OPENSSL_arm_midr = 0;
  26 unsigned int OPENSSL_armv8_rsa_neonized = 0;
  27
  28 #if __ARM_MAX_ARCH__<7
  29 void OPENSSL_cpuid_setup(void)
  30 {
  31 }
  32
  33 uint32_t OPENSSL_rdtsc(void)
  34 {
  35     return 0;
  36 }
  37 #else
  38 static sigset_t all_masked;
  39
  40 static sigjmp_buf ill_jmp;
  41 static void ill_handler(int sig)
  42 {
  43     siglongjmp(ill_jmp, sig);
  44 }
  45
  46 /*
  47  * Following subroutines could have been inlined, but it's not all
  48  * ARM compilers support inline assembler...
  49  */
  50 void _armv7_neon_probe(void);
  51 void _armv8_aes_probe(void);
  52 void _armv8_sha1_probe(void);
  53 void _armv8_sha256_probe(void);
  54 void _armv8_pmull_probe(void);
  55 # ifdef __aarch64__
  56 void _armv8_sm3_probe(void);
  57 void _armv8_sm4_probe(void);
  58 void _armv8_sha512_probe(void);
  59 unsigned int _armv8_cpuid_probe(void);
  60 void _armv8_rng_probe(void);
  61
  62 size_t OPENSSL_rndr_asm(unsigned char *buf, size_t len);
  63 size_t OPENSSL_rndrrs_asm(unsigned char *buf, size_t len);
  64
  65 size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len);
  66 size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len);
  67
  68 static size_t OPENSSL_rndr_wrapper(size_t (*func)(unsigned char *, size_t), unsigned char *buf, size_t len)
  69 {
  70     size_t buffer_size = 0;
  71     int i;
  72
  73     for (i = 0; i < 8; i++) {
  74         buffer_size = func(buf, len);
  75         if (buffer_size == len)
  76             break;
  77         usleep(5000);  /* 5000 microseconds (5 milliseconds) */
  78     }
  79     return buffer_size;
  80 }
  81
  82 size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len)
  83 {
  84     return OPENSSL_rndr_wrapper(OPENSSL_rndr_asm, buf, len);
  85 }
  86
  87 size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len)
  88 {
  89     return OPENSSL_rndr_wrapper(OPENSSL_rndrrs_asm, buf, len);
  90 }
  91 # endif
  92 uint32_t _armv7_tick(void);
  93
  94 uint32_t OPENSSL_rdtsc(void)
  95 {
  96     if (OPENSSL_armcap_P & ARMV7_TICK)
  97         return _armv7_tick();
  98     else
  99         return 0;
 100 }
 101
 102 # if defined(__GNUC__) && __GNUC__>=2
 103 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
 104 # endif
 105
 106 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
 107 #  if __GLIBC_PREREQ(2, 16)
 108 #   include <sys/auxv.h>
 109 #   define OSSL_IMPLEMENT_GETAUXVAL
 110 #  endif
 111 # elif defined(__ANDROID_API__)
 112 /* see https://developer.android.google.cn/ndk/guides/cpu-features */
 113 #  if __ANDROID_API__ >= 18
 114 #   include <sys/auxv.h>
 115 #   define OSSL_IMPLEMENT_GETAUXVAL
 116 #  endif
 117 # endif
 118 # if defined(__FreeBSD__)
 119 #  include <sys/param.h>
 120 #  if __FreeBSD_version >= 1200000
 121 #   include <sys/auxv.h>
 122 #   define OSSL_IMPLEMENT_GETAUXVAL
 123
 124 static unsigned long getauxval(unsigned long key)
 125 {
 126   unsigned long val = 0ul;
 127
 128   if (elf_aux_info((int)key, &val, sizeof(val)) != 0)
 129     return 0ul;
 130
 131   return val;
 132 }
 133 #  endif
 134 # endif
 135
 136 /*
 137  * Android: according to https://developer.android.com/ndk/guides/cpu-features,
 138  * getauxval is supported starting with API level 18
 139  */
 140 #  if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18
 141 #   include <sys/auxv.h>
 142 #   define OSSL_IMPLEMENT_GETAUXVAL
 143 #  endif
 144
 145 /*
 146  * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
 147  * AArch64 used AT_HWCAP.
 148  */
 149 # ifndef AT_HWCAP
 150 #  define AT_HWCAP               16
 151 # endif
 152 # ifndef AT_HWCAP2
 153 #  define AT_HWCAP2              26
 154 # endif
 155 # if defined(__arm__) || defined (__arm)
 156 #  define HWCAP                  AT_HWCAP
 157 #  define HWCAP_NEON             (1 << 12)
 158
 159 #  define HWCAP_CE               AT_HWCAP2
 160 #  define HWCAP_CE_AES           (1 << 0)
 161 #  define HWCAP_CE_PMULL         (1 << 1)
 162 #  define HWCAP_CE_SHA1          (1 << 2)
 163 #  define HWCAP_CE_SHA256        (1 << 3)
 164 # elif defined(__aarch64__)
 165 #  define HWCAP                  AT_HWCAP
 166 #  define HWCAP_NEON             (1 << 1)
 167
 168 #  define HWCAP_CE               HWCAP
 169 #  define HWCAP_CE_AES           (1 << 3)
 170 #  define HWCAP_CE_PMULL         (1 << 4)
 171 #  define HWCAP_CE_SHA1          (1 << 5)
 172 #  define HWCAP_CE_SHA256        (1 << 6)
 173 #  define HWCAP_CPUID            (1 << 11)
 174 #  define HWCAP_SHA3             (1 << 17)
 175 #  define HWCAP_CE_SM3           (1 << 18)
 176 #  define HWCAP_CE_SM4           (1 << 19)
 177 #  define HWCAP_CE_SHA512        (1 << 21)
 178                                   /* AT_HWCAP2 */
 179 #  define HWCAP2                 26
 180 #  define HWCAP2_RNG             (1 << 16)
 181 # endif
 182
 183 void OPENSSL_cpuid_setup(void)
 184 {
 185     const char *e;
 186     struct sigaction ill_oact, ill_act;
 187     sigset_t oset;
 188     static int trigger = 0;
 189
 190     if (trigger)
 191         return;
 192     trigger = 1;
 193
 194     OPENSSL_armcap_P = 0;
 195
 196     if ((e = getenv("OPENSSL_armcap"))) {
 197         OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
 198         return;
 199     }
 200
 201 # if defined(__APPLE__)
 202 #   if !defined(__aarch64__)
 203     /*
 204      * Capability probing by catching SIGILL appears to be problematic
 205      * on iOS. But since Apple universe is "monocultural", it's actually
 206      * possible to simply set pre-defined processor capability mask.
 207      */
 208     if (1) {
 209         OPENSSL_armcap_P = ARMV7_NEON;
 210         return;
 211     }
 212     /*
 213      * One could do same even for __aarch64__ iOS builds. It's not done
 214      * exclusively for reasons of keeping code unified across platforms.
 215      * Unified code works because it never triggers SIGILL on Apple
 216      * devices...
 217      */
 218 #   else
 219     {
 220         unsigned int feature;
 221         size_t len = sizeof(feature);
 222         char uarch[64];
 223
 224         if (sysctlbyname("hw.optional.armv8_2_sha512", &feature, &len, NULL, 0) == 0 && feature == 1)
 225             OPENSSL_armcap_P |= ARMV8_SHA512;
 226         feature = 0;
 227         if (sysctlbyname("hw.optional.armv8_2_sha3", &feature, &len, NULL, 0) == 0 && feature == 1) {
 228             OPENSSL_armcap_P |= ARMV8_SHA3;
 229             len = sizeof(uarch);
 230             if ((sysctlbyname("machdep.cpu.brand_string", uarch, &len, NULL, 0) == 0) &&
 231                 (strncmp(uarch, "Apple M1", 8) == 0))
 232                 OPENSSL_armcap_P |= ARMV8_UNROLL8_EOR3;
 233         }
 234     }
 235 #   endif
 236 # endif
 237
 238 # ifdef OSSL_IMPLEMENT_GETAUXVAL
 239     if (getauxval(HWCAP) & HWCAP_NEON) {
 240         unsigned long hwcap = getauxval(HWCAP_CE);
 241
 242         OPENSSL_armcap_P |= ARMV7_NEON;
 243
 244         if (hwcap & HWCAP_CE_AES)
 245             OPENSSL_armcap_P |= ARMV8_AES;
 246
 247         if (hwcap & HWCAP_CE_PMULL)
 248             OPENSSL_armcap_P |= ARMV8_PMULL;
 249
 250         if (hwcap & HWCAP_CE_SHA1)
 251             OPENSSL_armcap_P |= ARMV8_SHA1;
 252
 253         if (hwcap & HWCAP_CE_SHA256)
 254             OPENSSL_armcap_P |= ARMV8_SHA256;
 255
 256 #  ifdef __aarch64__
 257         if (hwcap & HWCAP_CE_SM4)
 258             OPENSSL_armcap_P |= ARMV8_SM4;
 259
 260         if (hwcap & HWCAP_CE_SHA512)
 261             OPENSSL_armcap_P |= ARMV8_SHA512;
 262
 263         if (hwcap & HWCAP_CPUID)
 264             OPENSSL_armcap_P |= ARMV8_CPUID;
 265
 266         if (hwcap & HWCAP_CE_SM3)
 267             OPENSSL_armcap_P |= ARMV8_SM3;
 268         if (hwcap & HWCAP_SHA3)
 269             OPENSSL_armcap_P |= ARMV8_SHA3;
 270 #  endif
 271     }
 272 #  ifdef __aarch64__
 273         if (getauxval(HWCAP2) & HWCAP2_RNG)
 274             OPENSSL_armcap_P |= ARMV8_RNG;
 275 #  endif
 276 # endif
 277
 278     sigfillset(&all_masked);
 279     sigdelset(&all_masked, SIGILL);
 280     sigdelset(&all_masked, SIGTRAP);
 281     sigdelset(&all_masked, SIGFPE);
 282     sigdelset(&all_masked, SIGBUS);
 283     sigdelset(&all_masked, SIGSEGV);
 284
 285     memset(&ill_act, 0, sizeof(ill_act));
 286     ill_act.sa_handler = ill_handler;
 287     ill_act.sa_mask = all_masked;
 288
 289     sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
 290     sigaction(SIGILL, &ill_act, &ill_oact);
 291
 292     /* If we used getauxval, we already have all the values */
 293 # ifndef OSSL_IMPLEMENT_GETAUXVAL
 294     if (sigsetjmp(ill_jmp, 1) == 0) {
 295         _armv7_neon_probe();
 296         OPENSSL_armcap_P |= ARMV7_NEON;
 297         if (sigsetjmp(ill_jmp, 1) == 0) {
 298             _armv8_pmull_probe();
 299             OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
 300         } else if (sigsetjmp(ill_jmp, 1) == 0) {
 301             _armv8_aes_probe();
 302             OPENSSL_armcap_P |= ARMV8_AES;
 303         }
 304         if (sigsetjmp(ill_jmp, 1) == 0) {
 305             _armv8_sha1_probe();
 306             OPENSSL_armcap_P |= ARMV8_SHA1;
 307         }
 308         if (sigsetjmp(ill_jmp, 1) == 0) {
 309             _armv8_sha256_probe();
 310             OPENSSL_armcap_P |= ARMV8_SHA256;
 311         }
 312 #  if defined(__aarch64__) && !defined(__APPLE__)
 313         if (sigsetjmp(ill_jmp, 1) == 0) {
 314             _armv8_sm4_probe();
 315             OPENSSL_armcap_P |= ARMV8_SM4;
 316         }
 317
 318         if (sigsetjmp(ill_jmp, 1) == 0) {
 319             _armv8_sha512_probe();
 320             OPENSSL_armcap_P |= ARMV8_SHA512;
 321         }
 322
 323         if (sigsetjmp(ill_jmp, 1) == 0) {
 324             _armv8_sm3_probe();
 325             OPENSSL_armcap_P |= ARMV8_SM3;
 326         if (sigsetjmp(ill_jmp, 1) == 0) {
 327             _armv8_eor3_probe();
 328             OPENSSL_armcap_P |= ARMV8_SHA3;
 329         }
 330 #  endif
 331     }
 332 #  ifdef __aarch64__
 333     if (sigsetjmp(ill_jmp, 1) == 0) {
 334         _armv8_rng_probe();
 335         OPENSSL_armcap_P |= ARMV8_RNG;
 336     }
 337 #  endif
 338 # endif
 339
 340     /* Things that getauxval didn't tell us */
 341     if (sigsetjmp(ill_jmp, 1) == 0) {
 342         _armv7_tick();
 343         OPENSSL_armcap_P |= ARMV7_TICK;
 344     }
 345
 346     sigaction(SIGILL, &ill_oact, NULL);
 347     sigprocmask(SIG_SETMASK, &oset, NULL);
 348
 349 # ifdef __aarch64__
 350     if (OPENSSL_armcap_P & ARMV8_CPUID)
 351         OPENSSL_arm_midr = _armv8_cpuid_probe();
 352
 353     if ((MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A72) ||
 354          MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_N1)) &&
 355         (OPENSSL_armcap_P & ARMV7_NEON)) {
 356             OPENSSL_armv8_rsa_neonized = 1;
 357     }
 358     if ((MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_V1)) &&
 359         (OPENSSL_armcap_P & ARMV8_SHA3))
 360         OPENSSL_armcap_P |= ARMV8_UNROLL8_EOR3;
 361 # endif
 362 }
 363 #endif