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_sha512_probe(void);
57 unsigned int _armv8_cpuid_probe(void);
58 void _armv8_rng_probe(void);
60 size_t OPENSSL_rndr_asm(unsigned char *buf, size_t len);
61 size_t OPENSSL_rndrrs_asm(unsigned char *buf, size_t len);
63 size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len);
64 size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len);
66 static size_t OPENSSL_rndr_wrapper(size_t (*func)(unsigned char *, size_t), unsigned char *buf, size_t len)
68 size_t buffer_size = 0;
71 for (i = 0; i < 8; i++) {
72 buffer_size = func(buf, len);
73 if (buffer_size == len)
75 usleep(5000); /* 5000 microseconds (5 milliseconds) */
80 size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len)
82 return OPENSSL_rndr_wrapper(OPENSSL_rndr_asm, buf, len);
85 size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len)
87 return OPENSSL_rndr_wrapper(OPENSSL_rndrrs_asm, buf, len);
90 uint32_t _armv7_tick(void);
92 uint32_t OPENSSL_rdtsc(void)
94 if (OPENSSL_armcap_P & ARMV7_TICK)
100 # if defined(__GNUC__) && __GNUC__>=2
101 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
104 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
105 # if __GLIBC_PREREQ(2, 16)
106 # include <sys/auxv.h>
107 # define OSSL_IMPLEMENT_GETAUXVAL
109 # elif defined(__ANDROID_API__)
110 /* see https://developer.android.google.cn/ndk/guides/cpu-features */
111 # if __ANDROID_API__ >= 18
112 # include <sys/auxv.h>
113 # define OSSL_IMPLEMENT_GETAUXVAL
116 # if defined(__FreeBSD__)
117 # include <sys/param.h>
118 # if __FreeBSD_version >= 1200000
119 # include <sys/auxv.h>
120 # define OSSL_IMPLEMENT_GETAUXVAL
122 static unsigned long getauxval(unsigned long key)
124 unsigned long val = 0ul;
126 if (elf_aux_info((int)key, &val, sizeof(val)) != 0)
135 * Android: according to https://developer.android.com/ndk/guides/cpu-features,
136 * getauxval is supported starting with API level 18
138 # if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18
139 # include <sys/auxv.h>
140 # define OSSL_IMPLEMENT_GETAUXVAL
144 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
145 * AArch64 used AT_HWCAP.
151 # define AT_HWCAP2 26
153 # if defined(__arm__) || defined (__arm)
154 # define HWCAP AT_HWCAP
155 # define HWCAP_NEON (1 << 12)
157 # define HWCAP_CE AT_HWCAP2
158 # define HWCAP_CE_AES (1 << 0)
159 # define HWCAP_CE_PMULL (1 << 1)
160 # define HWCAP_CE_SHA1 (1 << 2)
161 # define HWCAP_CE_SHA256 (1 << 3)
162 # elif defined(__aarch64__)
163 # define HWCAP AT_HWCAP
164 # define HWCAP_NEON (1 << 1)
166 # define HWCAP_CE HWCAP
167 # define HWCAP_CE_AES (1 << 3)
168 # define HWCAP_CE_PMULL (1 << 4)
169 # define HWCAP_CE_SHA1 (1 << 5)
170 # define HWCAP_CE_SHA256 (1 << 6)
171 # define HWCAP_CPUID (1 << 11)
172 # define HWCAP_CE_SHA512 (1 << 21)
175 # define HWCAP2_RNG (1 << 16)
178 void OPENSSL_cpuid_setup(void)
181 struct sigaction ill_oact, ill_act;
183 static int trigger = 0;
189 OPENSSL_armcap_P = 0;
191 if ((e = getenv("OPENSSL_armcap"))) {
192 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
196 # if defined(__APPLE__)
197 # if !defined(__aarch64__)
199 * Capability probing by catching SIGILL appears to be problematic
200 * on iOS. But since Apple universe is "monocultural", it's actually
201 * possible to simply set pre-defined processor capability mask.
204 OPENSSL_armcap_P = ARMV7_NEON;
208 * One could do same even for __aarch64__ iOS builds. It's not done
209 * exclusively for reasons of keeping code unified across platforms.
210 * Unified code works because it never triggers SIGILL on Apple
216 size_t len = sizeof(sha512);
218 if (sysctlbyname("hw.optional.armv8_2_sha512", &sha512, &len, NULL, 0) == 0 && sha512 == 1)
219 OPENSSL_armcap_P |= ARMV8_SHA512;
224 # ifdef OSSL_IMPLEMENT_GETAUXVAL
225 if (getauxval(HWCAP) & HWCAP_NEON) {
226 unsigned long hwcap = getauxval(HWCAP_CE);
228 OPENSSL_armcap_P |= ARMV7_NEON;
230 if (hwcap & HWCAP_CE_AES)
231 OPENSSL_armcap_P |= ARMV8_AES;
233 if (hwcap & HWCAP_CE_PMULL)
234 OPENSSL_armcap_P |= ARMV8_PMULL;
236 if (hwcap & HWCAP_CE_SHA1)
237 OPENSSL_armcap_P |= ARMV8_SHA1;
239 if (hwcap & HWCAP_CE_SHA256)
240 OPENSSL_armcap_P |= ARMV8_SHA256;
243 if (hwcap & HWCAP_CE_SHA512)
244 OPENSSL_armcap_P |= ARMV8_SHA512;
246 if (hwcap & HWCAP_CPUID)
247 OPENSSL_armcap_P |= ARMV8_CPUID;
251 if (getauxval(HWCAP2) & HWCAP2_RNG)
252 OPENSSL_armcap_P |= ARMV8_RNG;
256 sigfillset(&all_masked);
257 sigdelset(&all_masked, SIGILL);
258 sigdelset(&all_masked, SIGTRAP);
259 sigdelset(&all_masked, SIGFPE);
260 sigdelset(&all_masked, SIGBUS);
261 sigdelset(&all_masked, SIGSEGV);
263 memset(&ill_act, 0, sizeof(ill_act));
264 ill_act.sa_handler = ill_handler;
265 ill_act.sa_mask = all_masked;
267 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
268 sigaction(SIGILL, &ill_act, &ill_oact);
270 /* If we used getauxval, we already have all the values */
271 # ifndef OSSL_IMPLEMENT_GETAUXVAL
272 if (sigsetjmp(ill_jmp, 1) == 0) {
274 OPENSSL_armcap_P |= ARMV7_NEON;
275 if (sigsetjmp(ill_jmp, 1) == 0) {
276 _armv8_pmull_probe();
277 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
278 } else if (sigsetjmp(ill_jmp, 1) == 0) {
280 OPENSSL_armcap_P |= ARMV8_AES;
282 if (sigsetjmp(ill_jmp, 1) == 0) {
284 OPENSSL_armcap_P |= ARMV8_SHA1;
286 if (sigsetjmp(ill_jmp, 1) == 0) {
287 _armv8_sha256_probe();
288 OPENSSL_armcap_P |= ARMV8_SHA256;
290 # if defined(__aarch64__) && !defined(__APPLE__)
291 if (sigsetjmp(ill_jmp, 1) == 0) {
292 _armv8_sha512_probe();
293 OPENSSL_armcap_P |= ARMV8_SHA512;
298 if (sigsetjmp(ill_jmp, 1) == 0) {
300 OPENSSL_armcap_P |= ARMV8_RNG;
305 /* Things that getauxval didn't tell us */
306 if (sigsetjmp(ill_jmp, 1) == 0) {
308 OPENSSL_armcap_P |= ARMV7_TICK;
311 sigaction(SIGILL, &ill_oact, NULL);
312 sigprocmask(SIG_SETMASK, &oset, NULL);
315 if (OPENSSL_armcap_P & ARMV8_CPUID)
316 OPENSSL_arm_midr = _armv8_cpuid_probe();
318 if ((MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A72) ||
319 MIDR_IS_CPU_MODEL(OPENSSL_arm_midr, ARM_CPU_IMP_ARM, ARM_CPU_PART_N1)) &&
320 (OPENSSL_armcap_P & ARMV7_NEON)) {
321 OPENSSL_armv8_rsa_neonized = 1;