1 /* 2 * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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 #include "internal/cryptlib.h" 17 18 #include "arm_arch.h" 19 20 unsigned int OPENSSL_armcap_P = 0; 21 22 #if __ARM_MAX_ARCH__<7 23 void OPENSSL_cpuid_setup(void) 24 { 25 } 26 27 uint32_t OPENSSL_rdtsc(void) 28 { 29 return 0; 30 } 31 #else 32 static sigset_t all_masked; 33 34 static sigjmp_buf ill_jmp; 35 static void ill_handler(int sig) 36 { 37 siglongjmp(ill_jmp, sig); 38 } 39 40 /* 41 * Following subroutines could have been inlined, but it's not all 42 * ARM compilers support inline assembler... 43 */ 44 void _armv7_neon_probe(void); 45 void _armv8_aes_probe(void); 46 void _armv8_sha1_probe(void); 47 void _armv8_sha256_probe(void); 48 void _armv8_pmull_probe(void); 49 # ifdef __aarch64__ 50 void _armv8_sha512_probe(void); 51 # endif 52 uint32_t _armv7_tick(void); 53 54 uint32_t OPENSSL_rdtsc(void) 55 { 56 if (OPENSSL_armcap_P & ARMV7_TICK) 57 return _armv7_tick(); 58 else 59 return 0; 60 } 61 62 # if defined(__GNUC__) && __GNUC__>=2 63 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor)); 64 # endif 65 66 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ) 67 # if __GLIBC_PREREQ(2, 16) 68 # include <sys/auxv.h> 69 # define OSSL_IMPLEMENT_GETAUXVAL 70 # endif 71 # elif defined(__ANDROID_API__) 72 /* see https://developer.android.google.cn/ndk/guides/cpu-features */ 73 # if __ANDROID_API__ >= 18 74 # include <sys/auxv.h> 75 # define OSSL_IMPLEMENT_GETAUXVAL 76 # endif 77 # endif 78 # if defined(__FreeBSD__) 79 # include <sys/param.h> 80 # if __FreeBSD_version >= 1200000 81 # include <sys/auxv.h> 82 # define OSSL_IMPLEMENT_GETAUXVAL 83 84 static unsigned long getauxval(unsigned long key) 85 { 86 unsigned long val = 0ul; 87 88 if (elf_aux_info((int)key, &val, sizeof(val)) != 0) 89 return 0ul; 90 91 return val; 92 } 93 # endif 94 # endif 95 96 /* 97 * Android: according to https://developer.android.com/ndk/guides/cpu-features, 98 * getauxval is supported starting with API level 18 99 */ 100 # if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18 101 # include <sys/auxv.h> 102 # define OSSL_IMPLEMENT_GETAUXVAL 103 # endif 104 105 /* 106 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas 107 * AArch64 used AT_HWCAP. 108 */ 109 # ifndef AT_HWCAP 110 # define AT_HWCAP 16 111 # endif 112 # ifndef AT_HWCAP2 113 # define AT_HWCAP2 26 114 # endif 115 # if defined(__arm__) || defined (__arm) 116 # define HWCAP AT_HWCAP 117 # define HWCAP_NEON (1 << 12) 118 119 # define HWCAP_CE AT_HWCAP2 120 # define HWCAP_CE_AES (1 << 0) 121 # define HWCAP_CE_PMULL (1 << 1) 122 # define HWCAP_CE_SHA1 (1 << 2) 123 # define HWCAP_CE_SHA256 (1 << 3) 124 # elif defined(__aarch64__) 125 # define HWCAP AT_HWCAP 126 # define HWCAP_NEON (1 << 1) 127 128 # define HWCAP_CE HWCAP 129 # define HWCAP_CE_AES (1 << 3) 130 # define HWCAP_CE_PMULL (1 << 4) 131 # define HWCAP_CE_SHA1 (1 << 5) 132 # define HWCAP_CE_SHA256 (1 << 6) 133 # define HWCAP_CE_SHA512 (1 << 21) 134 # endif 135 136 void OPENSSL_cpuid_setup(void) 137 { 138 const char *e; 139 struct sigaction ill_oact, ill_act; 140 sigset_t oset; 141 static int trigger = 0; 142 143 if (trigger) 144 return; 145 trigger = 1; 146 147 if ((e = getenv("OPENSSL_armcap"))) { 148 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0); 149 return; 150 } 151 152 # if defined(__APPLE__) && !defined(__aarch64__) 153 /* 154 * Capability probing by catching SIGILL appears to be problematic 155 * on iOS. But since Apple universe is "monocultural", it's actually 156 * possible to simply set pre-defined processor capability mask. 157 */ 158 if (1) { 159 OPENSSL_armcap_P = ARMV7_NEON; 160 return; 161 } 162 /* 163 * One could do same even for __aarch64__ iOS builds. It's not done 164 * exclusively for reasons of keeping code unified across platforms. 165 * Unified code works because it never triggers SIGILL on Apple 166 * devices... 167 */ 168 # endif 169 170 OPENSSL_armcap_P = 0; 171 172 # ifdef OSSL_IMPLEMENT_GETAUXVAL 173 if (getauxval(HWCAP) & HWCAP_NEON) { 174 unsigned long hwcap = getauxval(HWCAP_CE); 175 176 OPENSSL_armcap_P |= ARMV7_NEON; 177 178 if (hwcap & HWCAP_CE_AES) 179 OPENSSL_armcap_P |= ARMV8_AES; 180 181 if (hwcap & HWCAP_CE_PMULL) 182 OPENSSL_armcap_P |= ARMV8_PMULL; 183 184 if (hwcap & HWCAP_CE_SHA1) 185 OPENSSL_armcap_P |= ARMV8_SHA1; 186 187 if (hwcap & HWCAP_CE_SHA256) 188 OPENSSL_armcap_P |= ARMV8_SHA256; 189 190 # ifdef __aarch64__ 191 if (hwcap & HWCAP_CE_SHA512) 192 OPENSSL_armcap_P |= ARMV8_SHA512; 193 # endif 194 } 195 # endif 196 197 sigfillset(&all_masked); 198 sigdelset(&all_masked, SIGILL); 199 sigdelset(&all_masked, SIGTRAP); 200 sigdelset(&all_masked, SIGFPE); 201 sigdelset(&all_masked, SIGBUS); 202 sigdelset(&all_masked, SIGSEGV); 203 204 memset(&ill_act, 0, sizeof(ill_act)); 205 ill_act.sa_handler = ill_handler; 206 ill_act.sa_mask = all_masked; 207 208 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset); 209 sigaction(SIGILL, &ill_act, &ill_oact); 210 211 /* If we used getauxval, we already have all the values */ 212 # ifndef OSSL_IMPLEMENT_GETAUXVAL 213 if (sigsetjmp(ill_jmp, 1) == 0) { 214 _armv7_neon_probe(); 215 OPENSSL_armcap_P |= ARMV7_NEON; 216 if (sigsetjmp(ill_jmp, 1) == 0) { 217 _armv8_pmull_probe(); 218 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES; 219 } else if (sigsetjmp(ill_jmp, 1) == 0) { 220 _armv8_aes_probe(); 221 OPENSSL_armcap_P |= ARMV8_AES; 222 } 223 if (sigsetjmp(ill_jmp, 1) == 0) { 224 _armv8_sha1_probe(); 225 OPENSSL_armcap_P |= ARMV8_SHA1; 226 } 227 if (sigsetjmp(ill_jmp, 1) == 0) { 228 _armv8_sha256_probe(); 229 OPENSSL_armcap_P |= ARMV8_SHA256; 230 } 231 # if defined(__aarch64__) && !defined(__APPLE__) 232 if (sigsetjmp(ill_jmp, 1) == 0) { 233 _armv8_sha512_probe(); 234 OPENSSL_armcap_P |= ARMV8_SHA512; 235 } 236 # endif 237 } 238 # endif 239 240 /* Things that getauxval didn't tell us */ 241 if (sigsetjmp(ill_jmp, 1) == 0) { 242 _armv7_tick(); 243 OPENSSL_armcap_P |= ARMV7_TICK; 244 } 245 246 sigaction(SIGILL, &ill_oact, NULL); 247 sigprocmask(SIG_SETMASK, &oset, NULL); 248 } 249 #endif 250