2 * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
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
15 #include <openssl/crypto.h>
17 #include <sys/sysctl.h>
19 #include "internal/cryptlib.h"
23 unsigned int OPENSSL_armcap_P = 0;
24 unsigned int OPENSSL_arm_midr = 0;
25 unsigned int OPENSSL_armv8_rsa_neonized = 0;
27 #if __ARM_MAX_ARCH__<7
28 void OPENSSL_cpuid_setup(void)
32 uint32_t OPENSSL_rdtsc(void)
37 static sigset_t all_masked;
39 static sigjmp_buf ill_jmp;
40 static void ill_handler(int sig)
42 siglongjmp(ill_jmp, sig);
46 * Following subroutines could have been inlined, but it's not all
47 * ARM compilers support inline assembler...
49 void _armv7_neon_probe(void);
50 void _armv8_aes_probe(void);
51 void _armv8_sha1_probe(void);
52 void _armv8_sha256_probe(void);
53 void _armv8_pmull_probe(void);
55 void _armv8_sha512_probe(void);
56 unsigned int _armv8_cpuid_probe(void);
58 uint32_t _armv7_tick(void);
60 uint32_t OPENSSL_rdtsc(void)
62 if (OPENSSL_armcap_P & ARMV7_TICK)
68 # if defined(__GNUC__) && __GNUC__>=2
69 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
72 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
73 # if __GLIBC_PREREQ(2, 16)
74 # include <sys/auxv.h>
75 # define OSSL_IMPLEMENT_GETAUXVAL
78 # if defined(__FreeBSD__)
79 # include <sys/param.h>
80 # if __FreeBSD_version >= 1200000
81 # include <sys/auxv.h>
82 # define OSSL_IMPLEMENT_GETAUXVAL
84 static unsigned long getauxval(unsigned long key)
86 unsigned long val = 0ul;
88 if (elf_aux_info((int)key, &val, sizeof(val)) != 0)
97 * Android: according to https://developer.android.com/ndk/guides/cpu-features,
98 * getauxval is supported starting with API level 18
100 # if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18
101 # include <sys/auxv.h>
102 # define OSSL_IMPLEMENT_GETAUXVAL
106 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
107 * AArch64 used AT_HWCAP.
109 # if defined(__arm__) || defined (__arm)
112 # define HWCAP_NEON (1 << 12)
116 # define HWCAP_CE_AES (1 << 0)
117 # define HWCAP_CE_PMULL (1 << 1)
118 # define HWCAP_CE_SHA1 (1 << 2)
119 # define HWCAP_CE_SHA256 (1 << 3)
120 # elif defined(__aarch64__)
123 # define HWCAP_NEON (1 << 1)
125 # define HWCAP_CE HWCAP
126 # define HWCAP_CE_AES (1 << 3)
127 # define HWCAP_CE_PMULL (1 << 4)
128 # define HWCAP_CE_SHA1 (1 << 5)
129 # define HWCAP_CE_SHA256 (1 << 6)
130 # define HWCAP_CPUID (1 << 11)
131 # define HWCAP_CE_SHA512 (1 << 21)
134 void OPENSSL_cpuid_setup(void)
137 struct sigaction ill_oact, ill_act;
139 static int trigger = 0;
145 OPENSSL_armcap_P = 0;
147 if ((e = getenv("OPENSSL_armcap"))) {
148 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
152 # if defined(__APPLE__)
153 # if !defined(__aarch64__)
155 * Capability probing by catching SIGILL appears to be problematic
156 * on iOS. But since Apple universe is "monocultural", it's actually
157 * possible to simply set pre-defined processor capability mask.
160 OPENSSL_armcap_P = ARMV7_NEON;
164 * One could do same even for __aarch64__ iOS builds. It's not done
165 * exclusively for reasons of keeping code unified across platforms.
166 * Unified code works because it never triggers SIGILL on Apple
172 size_t len = sizeof(sha512);
174 if (sysctlbyname("hw.optional.armv8_2_sha512", &sha512, &len, NULL, 0) == 0 && sha512 == 1)
175 OPENSSL_armcap_P |= ARMV8_SHA512;
180 # ifdef OSSL_IMPLEMENT_GETAUXVAL
181 if (getauxval(HWCAP) & HWCAP_NEON) {
182 unsigned long hwcap = getauxval(HWCAP_CE);
184 OPENSSL_armcap_P |= ARMV7_NEON;
186 if (hwcap & HWCAP_CE_AES)
187 OPENSSL_armcap_P |= ARMV8_AES;
189 if (hwcap & HWCAP_CE_PMULL)
190 OPENSSL_armcap_P |= ARMV8_PMULL;
192 if (hwcap & HWCAP_CE_SHA1)
193 OPENSSL_armcap_P |= ARMV8_SHA1;
195 if (hwcap & HWCAP_CE_SHA256)
196 OPENSSL_armcap_P |= ARMV8_SHA256;
199 if (hwcap & HWCAP_CE_SHA512)
200 OPENSSL_armcap_P |= ARMV8_SHA512;
202 if (hwcap & HWCAP_CPUID)
203 OPENSSL_armcap_P |= ARMV8_CPUID;
208 sigfillset(&all_masked);
209 sigdelset(&all_masked, SIGILL);
210 sigdelset(&all_masked, SIGTRAP);
211 sigdelset(&all_masked, SIGFPE);
212 sigdelset(&all_masked, SIGBUS);
213 sigdelset(&all_masked, SIGSEGV);
215 memset(&ill_act, 0, sizeof(ill_act));
216 ill_act.sa_handler = ill_handler;
217 ill_act.sa_mask = all_masked;
219 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
220 sigaction(SIGILL, &ill_act, &ill_oact);
222 /* If we used getauxval, we already have all the values */
223 # ifndef OSSL_IMPLEMENT_GETAUXVAL
224 if (sigsetjmp(ill_jmp, 1) == 0) {
226 OPENSSL_armcap_P |= ARMV7_NEON;
227 if (sigsetjmp(ill_jmp, 1) == 0) {
228 _armv8_pmull_probe();
229 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
230 } else if (sigsetjmp(ill_jmp, 1) == 0) {
232 OPENSSL_armcap_P |= ARMV8_AES;
234 if (sigsetjmp(ill_jmp, 1) == 0) {
236 OPENSSL_armcap_P |= ARMV8_SHA1;
238 if (sigsetjmp(ill_jmp, 1) == 0) {
239 _armv8_sha256_probe();
240 OPENSSL_armcap_P |= ARMV8_SHA256;
242 # if defined(__aarch64__) && !defined(__APPLE__)
243 if (sigsetjmp(ill_jmp, 1) == 0) {
244 _armv8_sha512_probe();
245 OPENSSL_armcap_P |= ARMV8_SHA512;
251 /* Things that getauxval didn't tell us */
252 if (sigsetjmp(ill_jmp, 1) == 0) {
254 OPENSSL_armcap_P |= ARMV7_TICK;
257 sigaction(SIGILL, &ill_oact, NULL);
258 sigprocmask(SIG_SETMASK, &oset, NULL);
261 if (OPENSSL_armcap_P & ARMV8_CPUID)
262 OPENSSL_arm_midr = _armv8_cpuid_probe();
264 if ((MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A72) ||
265 MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_N1)) &&
266 (OPENSSL_armcap_P & ARMV7_NEON)) {
267 OPENSSL_armv8_rsa_neonized = 1;