1 /* 2 * Copyright 2011-2019 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 __attribute__ ((visibility("hidden"))) 21 unsigned int OPENSSL_armcap_P = 0; 22 23 #if __ARM_MAX_ARCH__<7 24 void OPENSSL_cpuid_setup(void) 25 { 26 } 27 28 uint32_t OPENSSL_rdtsc(void) 29 { 30 return 0; 31 } 32 #else 33 static sigset_t all_masked; 34 35 static sigjmp_buf ill_jmp; 36 static void ill_handler(int sig) 37 { 38 siglongjmp(ill_jmp, sig); 39 } 40 41 /* 42 * Following subroutines could have been inlined, but it's not all 43 * ARM compilers support inline assembler... 44 */ 45 void _armv7_neon_probe(void); 46 void _armv8_aes_probe(void); 47 void _armv8_sha1_probe(void); 48 void _armv8_sha256_probe(void); 49 void _armv8_pmull_probe(void); 50 # ifdef __aarch64__ 51 void _armv8_sha512_probe(void); 52 # endif 53 uint32_t _armv7_tick(void); 54 55 uint32_t OPENSSL_rdtsc(void) 56 { 57 if (OPENSSL_armcap_P & ARMV7_TICK) 58 return _armv7_tick(); 59 else 60 return 0; 61 } 62 63 # if defined(__GNUC__) && __GNUC__>=2 64 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor)); 65 # endif 66 67 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ) 68 # if __GLIBC_PREREQ(2, 16) 69 # include <sys/auxv.h> 70 # define OSSL_IMPLEMENT_GETAUXVAL 71 # endif 72 # endif 73 74 /* 75 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas 76 * AArch64 used AT_HWCAP. 77 */ 78 # if defined(__arm__) || defined (__arm) 79 # define HWCAP 16 80 /* AT_HWCAP */ 81 # define HWCAP_NEON (1 << 12) 82 83 # define HWCAP_CE 26 84 /* AT_HWCAP2 */ 85 # define HWCAP_CE_AES (1 << 0) 86 # define HWCAP_CE_PMULL (1 << 1) 87 # define HWCAP_CE_SHA1 (1 << 2) 88 # define HWCAP_CE_SHA256 (1 << 3) 89 # elif defined(__aarch64__) 90 # define HWCAP 16 91 /* AT_HWCAP */ 92 # define HWCAP_NEON (1 << 1) 93 94 # define HWCAP_CE HWCAP 95 # define HWCAP_CE_AES (1 << 3) 96 # define HWCAP_CE_PMULL (1 << 4) 97 # define HWCAP_CE_SHA1 (1 << 5) 98 # define HWCAP_CE_SHA256 (1 << 6) 99 # define HWCAP_CE_SHA512 (1 << 21) 100 # endif 101 102 void OPENSSL_cpuid_setup(void) 103 { 104 const char *e; 105 struct sigaction ill_oact, ill_act; 106 sigset_t oset; 107 static int trigger = 0; 108 109 if (trigger) 110 return; 111 trigger = 1; 112 113 if ((e = getenv("OPENSSL_armcap"))) { 114 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0); 115 return; 116 } 117 118 # if defined(__APPLE__) && !defined(__aarch64__) 119 /* 120 * Capability probing by catching SIGILL appears to be problematic 121 * on iOS. But since Apple universe is "monocultural", it's actually 122 * possible to simply set pre-defined processor capability mask. 123 */ 124 if (1) { 125 OPENSSL_armcap_P = ARMV7_NEON; 126 return; 127 } 128 /* 129 * One could do same even for __aarch64__ iOS builds. It's not done 130 * exclusively for reasons of keeping code unified across platforms. 131 * Unified code works because it never triggers SIGILL on Apple 132 * devices... 133 */ 134 # endif 135 136 OPENSSL_armcap_P = 0; 137 138 # ifdef OSSL_IMPLEMENT_GETAUXVAL 139 if (getauxval(HWCAP) & HWCAP_NEON) { 140 unsigned long hwcap = getauxval(HWCAP_CE); 141 142 OPENSSL_armcap_P |= ARMV7_NEON; 143 144 if (hwcap & HWCAP_CE_AES) 145 OPENSSL_armcap_P |= ARMV8_AES; 146 147 if (hwcap & HWCAP_CE_PMULL) 148 OPENSSL_armcap_P |= ARMV8_PMULL; 149 150 if (hwcap & HWCAP_CE_SHA1) 151 OPENSSL_armcap_P |= ARMV8_SHA1; 152 153 if (hwcap & HWCAP_CE_SHA256) 154 OPENSSL_armcap_P |= ARMV8_SHA256; 155 156 # ifdef __aarch64__ 157 if (hwcap & HWCAP_CE_SHA512) 158 OPENSSL_armcap_P |= ARMV8_SHA512; 159 # endif 160 } 161 # endif 162 163 sigfillset(&all_masked); 164 sigdelset(&all_masked, SIGILL); 165 sigdelset(&all_masked, SIGTRAP); 166 sigdelset(&all_masked, SIGFPE); 167 sigdelset(&all_masked, SIGBUS); 168 sigdelset(&all_masked, SIGSEGV); 169 170 memset(&ill_act, 0, sizeof(ill_act)); 171 ill_act.sa_handler = ill_handler; 172 ill_act.sa_mask = all_masked; 173 174 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset); 175 sigaction(SIGILL, &ill_act, &ill_oact); 176 177 /* If we used getauxval, we already have all the values */ 178 # ifndef OSSL_IMPLEMENT_GETAUXVAL 179 if (sigsetjmp(ill_jmp, 1) == 0) { 180 _armv7_neon_probe(); 181 OPENSSL_armcap_P |= ARMV7_NEON; 182 if (sigsetjmp(ill_jmp, 1) == 0) { 183 _armv8_pmull_probe(); 184 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES; 185 } else if (sigsetjmp(ill_jmp, 1) == 0) { 186 _armv8_aes_probe(); 187 OPENSSL_armcap_P |= ARMV8_AES; 188 } 189 if (sigsetjmp(ill_jmp, 1) == 0) { 190 _armv8_sha1_probe(); 191 OPENSSL_armcap_P |= ARMV8_SHA1; 192 } 193 if (sigsetjmp(ill_jmp, 1) == 0) { 194 _armv8_sha256_probe(); 195 OPENSSL_armcap_P |= ARMV8_SHA256; 196 } 197 # if defined(__aarch64__) && !defined(__APPLE__) 198 if (sigsetjmp(ill_jmp, 1) == 0) { 199 _armv8_sha512_probe(); 200 OPENSSL_armcap_P |= ARMV8_SHA512; 201 } 202 # endif 203 } 204 # endif 205 206 /* Things that getauxval didn't tell us */ 207 if (sigsetjmp(ill_jmp, 1) == 0) { 208 _armv7_tick(); 209 OPENSSL_armcap_P |= ARMV7_TICK; 210 } 211 212 sigaction(SIGILL, &ill_oact, NULL); 213 sigprocmask(SIG_SETMASK, &oset, NULL); 214 } 215 #endif 216