2 * Copyright 2011-2018 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 __attribute__ ((visibility("hidden")))
21 unsigned int OPENSSL_armcap_P = 0;
23 #if __ARM_MAX_ARCH__<7
24 void OPENSSL_cpuid_setup(void)
28 uint32_t OPENSSL_rdtsc(void)
33 static sigset_t all_masked;
35 static sigjmp_buf ill_jmp;
36 static void ill_handler(int sig)
38 siglongjmp(ill_jmp, sig);
42 * Following subroutines could have been inlined, but it's not all
43 * ARM compilers support inline assembler...
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);
51 void _armv8_sha512_probe(void);
53 uint32_t _armv7_tick(void);
55 uint32_t OPENSSL_rdtsc(void)
57 if (OPENSSL_armcap_P & ARMV7_TICK)
63 # if defined(__GNUC__) && __GNUC__>=2
64 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
67 * Use a weak reference to getauxval() so we can use it if it is available but
68 * don't break the build if it is not.
70 # if defined(__GNUC__) && __GNUC__>=2 && defined(__ELF__)
71 extern unsigned long getauxval(unsigned long type) __attribute__ ((weak));
73 static unsigned long (*getauxval) (unsigned long) = NULL;
77 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
78 * AArch64 used AT_HWCAP.
80 # if defined(__arm__) || defined (__arm)
83 # define HWCAP_NEON (1 << 12)
87 # define HWCAP_CE_AES (1 << 0)
88 # define HWCAP_CE_PMULL (1 << 1)
89 # define HWCAP_CE_SHA1 (1 << 2)
90 # define HWCAP_CE_SHA256 (1 << 3)
91 # elif defined(__aarch64__)
94 # define HWCAP_NEON (1 << 1)
96 # define HWCAP_CE HWCAP
97 # define HWCAP_CE_AES (1 << 3)
98 # define HWCAP_CE_PMULL (1 << 4)
99 # define HWCAP_CE_SHA1 (1 << 5)
100 # define HWCAP_CE_SHA256 (1 << 6)
101 # define HWCAP_CE_SHA512 (1 << 21)
104 void OPENSSL_cpuid_setup(void)
107 struct sigaction ill_oact, ill_act;
109 static int trigger = 0;
115 if ((e = getenv("OPENSSL_armcap"))) {
116 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
120 # if defined(__APPLE__) && !defined(__aarch64__)
122 * Capability probing by catching SIGILL appears to be problematic
123 * on iOS. But since Apple universe is "monocultural", it's actually
124 * possible to simply set pre-defined processor capability mask.
127 OPENSSL_armcap_P = ARMV7_NEON;
131 * One could do same even for __aarch64__ iOS builds. It's not done
132 * exclusively for reasons of keeping code unified across platforms.
133 * Unified code works because it never triggers SIGILL on Apple
138 sigfillset(&all_masked);
139 sigdelset(&all_masked, SIGILL);
140 sigdelset(&all_masked, SIGTRAP);
141 sigdelset(&all_masked, SIGFPE);
142 sigdelset(&all_masked, SIGBUS);
143 sigdelset(&all_masked, SIGSEGV);
145 OPENSSL_armcap_P = 0;
147 memset(&ill_act, 0, sizeof(ill_act));
148 ill_act.sa_handler = ill_handler;
149 ill_act.sa_mask = all_masked;
151 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
152 sigaction(SIGILL, &ill_act, &ill_oact);
154 if (getauxval != NULL) {
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;
177 } else if (sigsetjmp(ill_jmp, 1) == 0) {
179 OPENSSL_armcap_P |= ARMV7_NEON;
180 if (sigsetjmp(ill_jmp, 1) == 0) {
181 _armv8_pmull_probe();
182 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
183 } else if (sigsetjmp(ill_jmp, 1) == 0) {
185 OPENSSL_armcap_P |= ARMV8_AES;
187 if (sigsetjmp(ill_jmp, 1) == 0) {
189 OPENSSL_armcap_P |= ARMV8_SHA1;
191 if (sigsetjmp(ill_jmp, 1) == 0) {
192 _armv8_sha256_probe();
193 OPENSSL_armcap_P |= ARMV8_SHA256;
195 # if defined(__aarch64__) && !defined(__APPLE__)
196 if (sigsetjmp(ill_jmp, 1) == 0) {
197 _armv8_sha512_probe();
198 OPENSSL_armcap_P |= ARMV8_SHA512;
202 if (sigsetjmp(ill_jmp, 1) == 0) {
204 OPENSSL_armcap_P |= ARMV7_TICK;
207 sigaction(SIGILL, &ill_oact, NULL);
208 sigprocmask(SIG_SETMASK, &oset, NULL);