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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/armcap.c
2 * Copyright 2011-2017 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);
49 uint32_t _armv7_tick(void);
51 uint32_t OPENSSL_rdtsc(void)
53 if (OPENSSL_armcap_P
& ARMV7_TICK
)
59 # if defined(__GNUC__) && __GNUC__>=2
60 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor
));
63 * Use a weak reference to getauxval() so we can use it if it is available but
64 * don't break the build if it is not.
66 # if defined(__GNUC__) && __GNUC__>=2 && defined(__ELF__)
67 extern unsigned long getauxval(unsigned long type
) __attribute__ ((weak
));
69 static unsigned long (*getauxval
) (unsigned long) = NULL
;
73 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
74 * AArch64 used AT_HWCAP.
76 # if defined(__arm__) || defined (__arm)
79 # define HWCAP_NEON (1 << 12)
83 # define HWCAP_CE_AES (1 << 0)
84 # define HWCAP_CE_PMULL (1 << 1)
85 # define HWCAP_CE_SHA1 (1 << 2)
86 # define HWCAP_CE_SHA256 (1 << 3)
87 # elif defined(__aarch64__)
90 # define HWCAP_NEON (1 << 1)
92 # define HWCAP_CE HWCAP
93 # define HWCAP_CE_AES (1 << 3)
94 # define HWCAP_CE_PMULL (1 << 4)
95 # define HWCAP_CE_SHA1 (1 << 5)
96 # define HWCAP_CE_SHA256 (1 << 6)
99 void OPENSSL_cpuid_setup(void)
102 struct sigaction ill_oact
, ill_act
;
104 static int trigger
= 0;
110 if ((e
= getenv("OPENSSL_armcap"))) {
111 OPENSSL_armcap_P
= (unsigned int)strtoul(e
, NULL
, 0);
115 # if defined(__APPLE__) && !defined(__aarch64__)
117 * Capability probing by catching SIGILL appears to be problematic
118 * on iOS. But since Apple universe is "monocultural", it's actually
119 * possible to simply set pre-defined processor capability mask.
122 OPENSSL_armcap_P
= ARMV7_NEON
;
126 * One could do same even for __aarch64__ iOS builds. It's not done
127 * exclusively for reasons of keeping code unified across platforms.
128 * Unified code works because it never triggers SIGILL on Apple
133 sigfillset(&all_masked
);
134 sigdelset(&all_masked
, SIGILL
);
135 sigdelset(&all_masked
, SIGTRAP
);
136 sigdelset(&all_masked
, SIGFPE
);
137 sigdelset(&all_masked
, SIGBUS
);
138 sigdelset(&all_masked
, SIGSEGV
);
140 OPENSSL_armcap_P
= 0;
142 memset(&ill_act
, 0, sizeof(ill_act
));
143 ill_act
.sa_handler
= ill_handler
;
144 ill_act
.sa_mask
= all_masked
;
146 sigprocmask(SIG_SETMASK
, &ill_act
.sa_mask
, &oset
);
147 sigaction(SIGILL
, &ill_act
, &ill_oact
);
149 if (getauxval
!= NULL
) {
150 if (getauxval(HWCAP
) & HWCAP_NEON
) {
151 unsigned long hwcap
= getauxval(HWCAP_CE
);
153 OPENSSL_armcap_P
|= ARMV7_NEON
;
155 if (hwcap
& HWCAP_CE_AES
)
156 OPENSSL_armcap_P
|= ARMV8_AES
;
158 if (hwcap
& HWCAP_CE_PMULL
)
159 OPENSSL_armcap_P
|= ARMV8_PMULL
;
161 if (hwcap
& HWCAP_CE_SHA1
)
162 OPENSSL_armcap_P
|= ARMV8_SHA1
;
164 if (hwcap
& HWCAP_CE_SHA256
)
165 OPENSSL_armcap_P
|= ARMV8_SHA256
;
167 } else if (sigsetjmp(ill_jmp
, 1) == 0) {
169 OPENSSL_armcap_P
|= ARMV7_NEON
;
170 if (sigsetjmp(ill_jmp
, 1) == 0) {
171 _armv8_pmull_probe();
172 OPENSSL_armcap_P
|= ARMV8_PMULL
| ARMV8_AES
;
173 } else if (sigsetjmp(ill_jmp
, 1) == 0) {
175 OPENSSL_armcap_P
|= ARMV8_AES
;
177 if (sigsetjmp(ill_jmp
, 1) == 0) {
179 OPENSSL_armcap_P
|= ARMV8_SHA1
;
181 if (sigsetjmp(ill_jmp
, 1) == 0) {
182 _armv8_sha256_probe();
183 OPENSSL_armcap_P
|= ARMV8_SHA256
;
186 if (sigsetjmp(ill_jmp
, 1) == 0) {
188 OPENSSL_armcap_P
|= ARMV7_TICK
;
191 sigaction(SIGILL
, &ill_oact
, NULL
);
192 sigprocmask(SIG_SETMASK
, &oset
, NULL
);