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 # endif 72 # if defined(__FreeBSD__) 73 # include <sys/param.h> 74 # if __FreeBSD_version >= 1200000 75 # include <sys/auxv.h> 76 # define OSSL_IMPLEMENT_GETAUXVAL 77 78 static unsigned long getauxval(unsigned long key) 79 { 80 unsigned long val = 0ul; 81 82 if (elf_aux_info((int)key, &val, sizeof(val)) != 0) 83 return 0ul; 84 85 return val; 86 } 87 # endif 88 # endif 89 90 /* 91 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas 92 * AArch64 used AT_HWCAP. 93 */ 94 # if defined(__arm__) || defined (__arm) 95 # define HWCAP 16 96 /* AT_HWCAP */ 97 # define HWCAP_NEON (1 << 12) 98 99 # define HWCAP_CE 26 100 /* AT_HWCAP2 */ 101 # define HWCAP_CE_AES (1 << 0) 102 # define HWCAP_CE_PMULL (1 << 1) 103 # define HWCAP_CE_SHA1 (1 << 2) 104 # define HWCAP_CE_SHA256 (1 << 3) 105 # elif defined(__aarch64__) 106 # define HWCAP 16 107 /* AT_HWCAP */ 108 # define HWCAP_NEON (1 << 1) 109 110 # define HWCAP_CE HWCAP 111 # define HWCAP_CE_AES (1 << 3) 112 # define HWCAP_CE_PMULL (1 << 4) 113 # define HWCAP_CE_SHA1 (1 << 5) 114 # define HWCAP_CE_SHA256 (1 << 6) 115 # define HWCAP_CE_SHA512 (1 << 21) 116 # endif 117 118 void OPENSSL_cpuid_setup(void) 119 { 120 const char *e; 121 struct sigaction ill_oact, ill_act; 122 sigset_t oset; 123 static int trigger = 0; 124 125 if (trigger) 126 return; 127 trigger = 1; 128 129 if ((e = getenv("OPENSSL_armcap"))) { 130 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0); 131 return; 132 } 133 134 # if defined(__APPLE__) && !defined(__aarch64__) 135 /* 136 * Capability probing by catching SIGILL appears to be problematic 137 * on iOS. But since Apple universe is "monocultural", it's actually 138 * possible to simply set pre-defined processor capability mask. 139 */ 140 if (1) { 141 OPENSSL_armcap_P = ARMV7_NEON; 142 return; 143 } 144 /* 145 * One could do same even for __aarch64__ iOS builds. It's not done 146 * exclusively for reasons of keeping code unified across platforms. 147 * Unified code works because it never triggers SIGILL on Apple 148 * devices... 149 */ 150 # endif 151 152 OPENSSL_armcap_P = 0; 153 154 # ifdef OSSL_IMPLEMENT_GETAUXVAL 155 if (getauxval(HWCAP) & HWCAP_NEON) { 156 unsigned long hwcap = getauxval(HWCAP_CE); 157 158 OPENSSL_armcap_P |= ARMV7_NEON; 159 160 if (hwcap & HWCAP_CE_AES) 161 OPENSSL_armcap_P |= ARMV8_AES; 162 163 if (hwcap & HWCAP_CE_PMULL) 164 OPENSSL_armcap_P |= ARMV8_PMULL; 165 166 if (hwcap & HWCAP_CE_SHA1) 167 OPENSSL_armcap_P |= ARMV8_SHA1; 168 169 if (hwcap & HWCAP_CE_SHA256) 170 OPENSSL_armcap_P |= ARMV8_SHA256; 171 172 # ifdef __aarch64__ 173 if (hwcap & HWCAP_CE_SHA512) 174 OPENSSL_armcap_P |= ARMV8_SHA512; 175 # endif 176 } 177 # endif 178 179 sigfillset(&all_masked); 180 sigdelset(&all_masked, SIGILL); 181 sigdelset(&all_masked, SIGTRAP); 182 sigdelset(&all_masked, SIGFPE); 183 sigdelset(&all_masked, SIGBUS); 184 sigdelset(&all_masked, SIGSEGV); 185 186 memset(&ill_act, 0, sizeof(ill_act)); 187 ill_act.sa_handler = ill_handler; 188 ill_act.sa_mask = all_masked; 189 190 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset); 191 sigaction(SIGILL, &ill_act, &ill_oact); 192 193 /* If we used getauxval, we already have all the values */ 194 # ifndef OSSL_IMPLEMENT_GETAUXVAL 195 if (sigsetjmp(ill_jmp, 1) == 0) { 196 _armv7_neon_probe(); 197 OPENSSL_armcap_P |= ARMV7_NEON; 198 if (sigsetjmp(ill_jmp, 1) == 0) { 199 _armv8_pmull_probe(); 200 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES; 201 } else if (sigsetjmp(ill_jmp, 1) == 0) { 202 _armv8_aes_probe(); 203 OPENSSL_armcap_P |= ARMV8_AES; 204 } 205 if (sigsetjmp(ill_jmp, 1) == 0) { 206 _armv8_sha1_probe(); 207 OPENSSL_armcap_P |= ARMV8_SHA1; 208 } 209 if (sigsetjmp(ill_jmp, 1) == 0) { 210 _armv8_sha256_probe(); 211 OPENSSL_armcap_P |= ARMV8_SHA256; 212 } 213 # if defined(__aarch64__) && !defined(__APPLE__) 214 if (sigsetjmp(ill_jmp, 1) == 0) { 215 _armv8_sha512_probe(); 216 OPENSSL_armcap_P |= ARMV8_SHA512; 217 } 218 # endif 219 } 220 # endif 221 222 /* Things that getauxval didn't tell us */ 223 if (sigsetjmp(ill_jmp, 1) == 0) { 224 _armv7_tick(); 225 OPENSSL_armcap_P |= ARMV7_TICK; 226 } 227 228 sigaction(SIGILL, &ill_oact, NULL); 229 sigprocmask(SIG_SETMASK, &oset, NULL); 230 } 231 #endif 232