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"
24 unsigned int OPENSSL_armcap_P = 0;
25 unsigned int OPENSSL_arm_midr = 0;
26 unsigned int OPENSSL_armv8_rsa_neonized = 0;
28 #if __ARM_MAX_ARCH__<7
29 void OPENSSL_cpuid_setup(void)
33 uint32_t OPENSSL_rdtsc(void)
38 static sigset_t all_masked;
40 static sigjmp_buf ill_jmp;
41 static void ill_handler(int sig)
43 siglongjmp(ill_jmp, sig);
47 * Following subroutines could have been inlined, but it's not all
48 * ARM compilers support inline assembler...
50 void _armv7_neon_probe(void);
51 void _armv8_aes_probe(void);
52 void _armv8_sha1_probe(void);
53 void _armv8_sha256_probe(void);
54 void _armv8_pmull_probe(void);
56 void _armv8_sm3_probe(void);
57 void _armv8_sm4_probe(void);
58 void _armv8_sha512_probe(void);
59 unsigned int _armv8_cpuid_probe(void);
60 void _armv8_rng_probe(void);
62 size_t OPENSSL_rndr_asm(unsigned char *buf, size_t len);
63 size_t OPENSSL_rndrrs_asm(unsigned char *buf, size_t len);
65 size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len);
66 size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len);
68 static size_t OPENSSL_rndr_wrapper(size_t (*func)(unsigned char *, size_t), unsigned char *buf, size_t len)
70 size_t buffer_size = 0;
73 for (i = 0; i < 8; i++) {
74 buffer_size = func(buf, len);
75 if (buffer_size == len)
77 usleep(5000); /* 5000 microseconds (5 milliseconds) */
82 size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len)
84 return OPENSSL_rndr_wrapper(OPENSSL_rndr_asm, buf, len);
87 size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len)
89 return OPENSSL_rndr_wrapper(OPENSSL_rndrrs_asm, buf, len);
92 uint32_t _armv7_tick(void);
94 uint32_t OPENSSL_rdtsc(void)
96 if (OPENSSL_armcap_P & ARMV7_TICK)
102 # if defined(__GNUC__) && __GNUC__>=2
103 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
106 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
107 # if __GLIBC_PREREQ(2, 16)
108 # include <sys/auxv.h>
109 # define OSSL_IMPLEMENT_GETAUXVAL
111 # elif defined(__ANDROID_API__)
112 /* see https://developer.android.google.cn/ndk/guides/cpu-features */
113 # if __ANDROID_API__ >= 18
114 # include <sys/auxv.h>
115 # define OSSL_IMPLEMENT_GETAUXVAL
118 # if defined(__FreeBSD__)
119 # include <sys/param.h>
120 # if __FreeBSD_version >= 1200000
121 # include <sys/auxv.h>
122 # define OSSL_IMPLEMENT_GETAUXVAL
124 static unsigned long getauxval(unsigned long key)
126 unsigned long val = 0ul;
128 if (elf_aux_info((int)key, &val, sizeof(val)) != 0)
137 * Android: according to https://developer.android.com/ndk/guides/cpu-features,
138 * getauxval is supported starting with API level 18
140 # if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18
141 # include <sys/auxv.h>
142 # define OSSL_IMPLEMENT_GETAUXVAL
146 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
147 * AArch64 used AT_HWCAP.
153 # define AT_HWCAP2 26
155 # if defined(__arm__) || defined (__arm)
156 # define HWCAP AT_HWCAP
157 # define HWCAP_NEON (1 << 12)
159 # define HWCAP_CE AT_HWCAP2
160 # define HWCAP_CE_AES (1 << 0)
161 # define HWCAP_CE_PMULL (1 << 1)
162 # define HWCAP_CE_SHA1 (1 << 2)
163 # define HWCAP_CE_SHA256 (1 << 3)
164 # elif defined(__aarch64__)
165 # define HWCAP AT_HWCAP
166 # define HWCAP_NEON (1 << 1)
168 # define HWCAP_CE HWCAP
169 # define HWCAP_CE_AES (1 << 3)
170 # define HWCAP_CE_PMULL (1 << 4)
171 # define HWCAP_CE_SHA1 (1 << 5)
172 # define HWCAP_CE_SHA256 (1 << 6)
173 # define HWCAP_CPUID (1 << 11)
174 # define HWCAP_CE_SM3 (1 << 18)
175 # define HWCAP_CE_SM4 (1 << 19)
176 # define HWCAP_CE_SHA512 (1 << 21)
179 # define HWCAP2_RNG (1 << 16)
182 void OPENSSL_cpuid_setup(void)
185 struct sigaction ill_oact, ill_act;
187 static int trigger = 0;
193 OPENSSL_armcap_P = 0;
195 if ((e = getenv("OPENSSL_armcap"))) {
196 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
200 # if defined(__APPLE__)
201 # if !defined(__aarch64__)
203 * Capability probing by catching SIGILL appears to be problematic
204 * on iOS. But since Apple universe is "monocultural", it's actually
205 * possible to simply set pre-defined processor capability mask.
208 OPENSSL_armcap_P = ARMV7_NEON;
212 * One could do same even for __aarch64__ iOS builds. It's not done
213 * exclusively for reasons of keeping code unified across platforms.
214 * Unified code works because it never triggers SIGILL on Apple
220 size_t len = sizeof(sha512);
222 if (sysctlbyname("hw.optional.armv8_2_sha512", &sha512, &len, NULL, 0) == 0 && sha512 == 1)
223 OPENSSL_armcap_P |= ARMV8_SHA512;
228 # ifdef OSSL_IMPLEMENT_GETAUXVAL
229 if (getauxval(HWCAP) & HWCAP_NEON) {
230 unsigned long hwcap = getauxval(HWCAP_CE);
232 OPENSSL_armcap_P |= ARMV7_NEON;
234 if (hwcap & HWCAP_CE_AES)
235 OPENSSL_armcap_P |= ARMV8_AES;
237 if (hwcap & HWCAP_CE_PMULL)
238 OPENSSL_armcap_P |= ARMV8_PMULL;
240 if (hwcap & HWCAP_CE_SHA1)
241 OPENSSL_armcap_P |= ARMV8_SHA1;
243 if (hwcap & HWCAP_CE_SHA256)
244 OPENSSL_armcap_P |= ARMV8_SHA256;
247 if (hwcap & HWCAP_CE_SM4)
248 OPENSSL_armcap_P |= ARMV8_SM4;
250 if (hwcap & HWCAP_CE_SHA512)
251 OPENSSL_armcap_P |= ARMV8_SHA512;
253 if (hwcap & HWCAP_CPUID)
254 OPENSSL_armcap_P |= ARMV8_CPUID;
256 if (hwcap & HWCAP_CE_SM3)
257 OPENSSL_armcap_P |= ARMV8_SM3;
261 if (getauxval(HWCAP2) & HWCAP2_RNG)
262 OPENSSL_armcap_P |= ARMV8_RNG;
266 sigfillset(&all_masked);
267 sigdelset(&all_masked, SIGILL);
268 sigdelset(&all_masked, SIGTRAP);
269 sigdelset(&all_masked, SIGFPE);
270 sigdelset(&all_masked, SIGBUS);
271 sigdelset(&all_masked, SIGSEGV);
273 memset(&ill_act, 0, sizeof(ill_act));
274 ill_act.sa_handler = ill_handler;
275 ill_act.sa_mask = all_masked;
277 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
278 sigaction(SIGILL, &ill_act, &ill_oact);
280 /* If we used getauxval, we already have all the values */
281 # ifndef OSSL_IMPLEMENT_GETAUXVAL
282 if (sigsetjmp(ill_jmp, 1) == 0) {
284 OPENSSL_armcap_P |= ARMV7_NEON;
285 if (sigsetjmp(ill_jmp, 1) == 0) {
286 _armv8_pmull_probe();
287 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
288 } else if (sigsetjmp(ill_jmp, 1) == 0) {
290 OPENSSL_armcap_P |= ARMV8_AES;
292 if (sigsetjmp(ill_jmp, 1) == 0) {
294 OPENSSL_armcap_P |= ARMV8_SHA1;
296 if (sigsetjmp(ill_jmp, 1) == 0) {
297 _armv8_sha256_probe();
298 OPENSSL_armcap_P |= ARMV8_SHA256;
300 # if defined(__aarch64__) && !defined(__APPLE__)
301 if (sigsetjmp(ill_jmp, 1) == 0) {
303 OPENSSL_armcap_P |= ARMV8_SM4;
306 if (sigsetjmp(ill_jmp, 1) == 0) {
307 _armv8_sha512_probe();
308 OPENSSL_armcap_P |= ARMV8_SHA512;
311 if (sigsetjmp(ill_jmp, 1) == 0) {
313 OPENSSL_armcap_P |= ARMV8_SM3;
318 if (sigsetjmp(ill_jmp, 1) == 0) {
320 OPENSSL_armcap_P |= ARMV8_RNG;
325 /* Things that getauxval didn't tell us */
326 if (sigsetjmp(ill_jmp, 1) == 0) {
328 OPENSSL_armcap_P |= ARMV7_TICK;
331 sigaction(SIGILL, &ill_oact, NULL);
332 sigprocmask(SIG_SETMASK, &oset, NULL);
335 if (OPENSSL_armcap_P & ARMV8_CPUID)
336 OPENSSL_arm_midr = _armv8_cpuid_probe();
338 if ((MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A72) ||
339 MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_N1)) &&
340 (OPENSSL_armcap_P & ARMV7_NEON)) {
341 OPENSSL_armv8_rsa_neonized = 1;