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
72 # if defined(__FreeBSD__)
73 # include <sys/param.h>
74 # if __FreeBSD_version >= 1200000
75 # include <sys/auxv.h>
76 # define OSSL_IMPLEMENT_GETAUXVAL
78 static unsigned long getauxval(unsigned long key)
80 unsigned long val = 0ul;
82 if (elf_aux_info((int)key, &val, sizeof(val)) != 0)
91 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
92 * AArch64 used AT_HWCAP.
94 # if defined(__arm__) || defined (__arm)
97 # define HWCAP_NEON (1 << 12)
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__)
108 # define HWCAP_NEON (1 << 1)
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)
118 void OPENSSL_cpuid_setup(void)
121 struct sigaction ill_oact, ill_act;
123 static int trigger = 0;
129 if ((e = getenv("OPENSSL_armcap"))) {
130 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
134 # if defined(__APPLE__) && !defined(__aarch64__)
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.
141 OPENSSL_armcap_P = ARMV7_NEON;
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
152 OPENSSL_armcap_P = 0;
154 # ifdef OSSL_IMPLEMENT_GETAUXVAL
155 if (getauxval(HWCAP) & HWCAP_NEON) {
156 unsigned long hwcap = getauxval(HWCAP_CE);
158 OPENSSL_armcap_P |= ARMV7_NEON;
160 if (hwcap & HWCAP_CE_AES)
161 OPENSSL_armcap_P |= ARMV8_AES;
163 if (hwcap & HWCAP_CE_PMULL)
164 OPENSSL_armcap_P |= ARMV8_PMULL;
166 if (hwcap & HWCAP_CE_SHA1)
167 OPENSSL_armcap_P |= ARMV8_SHA1;
169 if (hwcap & HWCAP_CE_SHA256)
170 OPENSSL_armcap_P |= ARMV8_SHA256;
173 if (hwcap & HWCAP_CE_SHA512)
174 OPENSSL_armcap_P |= ARMV8_SHA512;
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);
186 memset(&ill_act, 0, sizeof(ill_act));
187 ill_act.sa_handler = ill_handler;
188 ill_act.sa_mask = all_masked;
190 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
191 sigaction(SIGILL, &ill_act, &ill_oact);
193 /* If we used getauxval, we already have all the values */
194 # ifndef OSSL_IMPLEMENT_GETAUXVAL
195 if (sigsetjmp(ill_jmp, 1) == 0) {
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) {
203 OPENSSL_armcap_P |= ARMV8_AES;
205 if (sigsetjmp(ill_jmp, 1) == 0) {
207 OPENSSL_armcap_P |= ARMV8_SHA1;
209 if (sigsetjmp(ill_jmp, 1) == 0) {
210 _armv8_sha256_probe();
211 OPENSSL_armcap_P |= ARMV8_SHA256;
213 # if defined(__aarch64__) && !defined(__APPLE__)
214 if (sigsetjmp(ill_jmp, 1) == 0) {
215 _armv8_sha512_probe();
216 OPENSSL_armcap_P |= ARMV8_SHA512;
222 /* Things that getauxval didn't tell us */
223 if (sigsetjmp(ill_jmp, 1) == 0) {
225 OPENSSL_armcap_P |= ARMV7_TICK;
228 sigaction(SIGILL, &ill_oact, NULL);
229 sigprocmask(SIG_SETMASK, &oset, NULL);