2 * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
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
15 #include <openssl/crypto.h>
16 #include "internal/cryptlib.h"
20 unsigned int OPENSSL_armcap_P = 0;
22 #if __ARM_MAX_ARCH__<7
23 void OPENSSL_cpuid_setup(void)
27 uint32_t OPENSSL_rdtsc(void)
32 static sigset_t all_masked;
34 static sigjmp_buf ill_jmp;
35 static void ill_handler(int sig)
37 siglongjmp(ill_jmp, sig);
41 * Following subroutines could have been inlined, but it's not all
42 * ARM compilers support inline assembler...
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);
50 void _armv8_sha512_probe(void);
52 uint32_t _armv7_tick(void);
54 uint32_t OPENSSL_rdtsc(void)
56 if (OPENSSL_armcap_P & ARMV7_TICK)
62 # if defined(__GNUC__) && __GNUC__>=2
63 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
66 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
67 # if __GLIBC_PREREQ(2, 16)
68 # include <sys/auxv.h>
69 # define OSSL_IMPLEMENT_GETAUXVAL
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
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_CE_SHA512 (1 << 21)
133 void OPENSSL_cpuid_setup(void)
136 struct sigaction ill_oact, ill_act;
138 static int trigger = 0;
144 if ((e = getenv("OPENSSL_armcap"))) {
145 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
149 # if defined(__APPLE__) && !defined(__aarch64__)
151 * Capability probing by catching SIGILL appears to be problematic
152 * on iOS. But since Apple universe is "monocultural", it's actually
153 * possible to simply set pre-defined processor capability mask.
156 OPENSSL_armcap_P = ARMV7_NEON;
160 * One could do same even for __aarch64__ iOS builds. It's not done
161 * exclusively for reasons of keeping code unified across platforms.
162 * Unified code works because it never triggers SIGILL on Apple
167 OPENSSL_armcap_P = 0;
169 # ifdef OSSL_IMPLEMENT_GETAUXVAL
170 if (getauxval(HWCAP) & HWCAP_NEON) {
171 unsigned long hwcap = getauxval(HWCAP_CE);
173 OPENSSL_armcap_P |= ARMV7_NEON;
175 if (hwcap & HWCAP_CE_AES)
176 OPENSSL_armcap_P |= ARMV8_AES;
178 if (hwcap & HWCAP_CE_PMULL)
179 OPENSSL_armcap_P |= ARMV8_PMULL;
181 if (hwcap & HWCAP_CE_SHA1)
182 OPENSSL_armcap_P |= ARMV8_SHA1;
184 if (hwcap & HWCAP_CE_SHA256)
185 OPENSSL_armcap_P |= ARMV8_SHA256;
188 if (hwcap & HWCAP_CE_SHA512)
189 OPENSSL_armcap_P |= ARMV8_SHA512;
194 sigfillset(&all_masked);
195 sigdelset(&all_masked, SIGILL);
196 sigdelset(&all_masked, SIGTRAP);
197 sigdelset(&all_masked, SIGFPE);
198 sigdelset(&all_masked, SIGBUS);
199 sigdelset(&all_masked, SIGSEGV);
201 memset(&ill_act, 0, sizeof(ill_act));
202 ill_act.sa_handler = ill_handler;
203 ill_act.sa_mask = all_masked;
205 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
206 sigaction(SIGILL, &ill_act, &ill_oact);
208 /* If we used getauxval, we already have all the values */
209 # ifndef OSSL_IMPLEMENT_GETAUXVAL
210 if (sigsetjmp(ill_jmp, 1) == 0) {
212 OPENSSL_armcap_P |= ARMV7_NEON;
213 if (sigsetjmp(ill_jmp, 1) == 0) {
214 _armv8_pmull_probe();
215 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
216 } else if (sigsetjmp(ill_jmp, 1) == 0) {
218 OPENSSL_armcap_P |= ARMV8_AES;
220 if (sigsetjmp(ill_jmp, 1) == 0) {
222 OPENSSL_armcap_P |= ARMV8_SHA1;
224 if (sigsetjmp(ill_jmp, 1) == 0) {
225 _armv8_sha256_probe();
226 OPENSSL_armcap_P |= ARMV8_SHA256;
228 # if defined(__aarch64__) && !defined(__APPLE__)
229 if (sigsetjmp(ill_jmp, 1) == 0) {
230 _armv8_sha512_probe();
231 OPENSSL_armcap_P |= ARMV8_SHA512;
237 /* Things that getauxval didn't tell us */
238 if (sigsetjmp(ill_jmp, 1) == 0) {
240 OPENSSL_armcap_P |= ARMV7_TICK;
243 sigaction(SIGILL, &ill_oact, NULL);
244 sigprocmask(SIG_SETMASK, &oset, NULL);