1 /*
2 * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
8 */
9
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <setjmp.h>
14 #include <signal.h>
15 #include <openssl/crypto.h>
16 #include "internal/cryptlib.h"
17
18 #include "arm_arch.h"
19
20 unsigned int OPENSSL_armcap_P = 0;
21
22 #if __ARM_MAX_ARCH__<7
OPENSSL_cpuid_setup(void)23 void OPENSSL_cpuid_setup(void)
24 {
25 }
26
OPENSSL_rdtsc(void)27 uint32_t OPENSSL_rdtsc(void)
28 {
29 return 0;
30 }
31 #else
32 static sigset_t all_masked;
33
34 static sigjmp_buf ill_jmp;
ill_handler(int sig)35 static void ill_handler(int sig)
36 {
37 siglongjmp(ill_jmp, sig);
38 }
39
40 /*
41 * Following subroutines could have been inlined, but it's not all
42 * ARM compilers support inline assembler...
43 */
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 # ifdef __aarch64__
50 void _armv8_sha512_probe(void);
51 # endif
52 uint32_t _armv7_tick(void);
53
OPENSSL_rdtsc(void)54 uint32_t OPENSSL_rdtsc(void)
55 {
56 if (OPENSSL_armcap_P & ARMV7_TICK)
57 return _armv7_tick();
58 else
59 return 0;
60 }
61
62 # if defined(__GNUC__) && __GNUC__>=2
63 void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
64 # endif
65
66 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
67 # if __GLIBC_PREREQ(2, 16)
68 # include <sys/auxv.h>
69 # define OSSL_IMPLEMENT_GETAUXVAL
70 # endif
71 # elif defined(__ANDROID_API__)
72 /* see https://developer.android.google.cn/ndk/guides/cpu-features */
73 # if __ANDROID_API__ >= 18
74 # include <sys/auxv.h>
75 # define OSSL_IMPLEMENT_GETAUXVAL
76 # endif
77 # endif
78 # if defined(__FreeBSD__)
79 # include <sys/param.h>
80 # if __FreeBSD_version >= 1200000
81 # include <sys/auxv.h>
82 # define OSSL_IMPLEMENT_GETAUXVAL
83
getauxval(unsigned long key)84 static unsigned long getauxval(unsigned long key)
85 {
86 unsigned long val = 0ul;
87
88 if (elf_aux_info((int)key, &val, sizeof(val)) != 0)
89 return 0ul;
90
91 return val;
92 }
93 # endif
94 # endif
95
96 /*
97 * Android: according to https://developer.android.com/ndk/guides/cpu-features,
98 * getauxval is supported starting with API level 18
99 */
100 # if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18
101 # include <sys/auxv.h>
102 # define OSSL_IMPLEMENT_GETAUXVAL
103 # endif
104
105 /*
106 * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
107 * AArch64 used AT_HWCAP.
108 */
109 # ifndef AT_HWCAP
110 # define AT_HWCAP 16
111 # endif
112 # ifndef AT_HWCAP2
113 # define AT_HWCAP2 26
114 # endif
115 # if defined(__arm__) || defined (__arm)
116 # define HWCAP AT_HWCAP
117 # define HWCAP_NEON (1 << 12)
118
119 # define HWCAP_CE AT_HWCAP2
120 # define HWCAP_CE_AES (1 << 0)
121 # define HWCAP_CE_PMULL (1 << 1)
122 # define HWCAP_CE_SHA1 (1 << 2)
123 # define HWCAP_CE_SHA256 (1 << 3)
124 # elif defined(__aarch64__)
125 # define HWCAP AT_HWCAP
126 # define HWCAP_NEON (1 << 1)
127
128 # define HWCAP_CE HWCAP
129 # define HWCAP_CE_AES (1 << 3)
130 # define HWCAP_CE_PMULL (1 << 4)
131 # define HWCAP_CE_SHA1 (1 << 5)
132 # define HWCAP_CE_SHA256 (1 << 6)
133 # define HWCAP_CE_SHA512 (1 << 21)
134 # endif
135
OPENSSL_cpuid_setup(void)136 void OPENSSL_cpuid_setup(void)
137 {
138 const char *e;
139 struct sigaction ill_oact, ill_act;
140 sigset_t oset;
141 static int trigger = 0;
142
143 if (trigger)
144 return;
145 trigger = 1;
146
147 if ((e = getenv("OPENSSL_armcap"))) {
148 OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
149 return;
150 }
151
152 # if defined(__APPLE__) && !defined(__aarch64__)
153 /*
154 * Capability probing by catching SIGILL appears to be problematic
155 * on iOS. But since Apple universe is "monocultural", it's actually
156 * possible to simply set pre-defined processor capability mask.
157 */
158 if (1) {
159 OPENSSL_armcap_P = ARMV7_NEON;
160 return;
161 }
162 /*
163 * One could do same even for __aarch64__ iOS builds. It's not done
164 * exclusively for reasons of keeping code unified across platforms.
165 * Unified code works because it never triggers SIGILL on Apple
166 * devices...
167 */
168 # endif
169
170 OPENSSL_armcap_P = 0;
171
172 # ifdef OSSL_IMPLEMENT_GETAUXVAL
173 if (getauxval(HWCAP) & HWCAP_NEON) {
174 unsigned long hwcap = getauxval(HWCAP_CE);
175
176 OPENSSL_armcap_P |= ARMV7_NEON;
177
178 if (hwcap & HWCAP_CE_AES)
179 OPENSSL_armcap_P |= ARMV8_AES;
180
181 if (hwcap & HWCAP_CE_PMULL)
182 OPENSSL_armcap_P |= ARMV8_PMULL;
183
184 if (hwcap & HWCAP_CE_SHA1)
185 OPENSSL_armcap_P |= ARMV8_SHA1;
186
187 if (hwcap & HWCAP_CE_SHA256)
188 OPENSSL_armcap_P |= ARMV8_SHA256;
189
190 # ifdef __aarch64__
191 if (hwcap & HWCAP_CE_SHA512)
192 OPENSSL_armcap_P |= ARMV8_SHA512;
193 # endif
194 }
195 # endif
196
197 sigfillset(&all_masked);
198 sigdelset(&all_masked, SIGILL);
199 sigdelset(&all_masked, SIGTRAP);
200 sigdelset(&all_masked, SIGFPE);
201 sigdelset(&all_masked, SIGBUS);
202 sigdelset(&all_masked, SIGSEGV);
203
204 memset(&ill_act, 0, sizeof(ill_act));
205 ill_act.sa_handler = ill_handler;
206 ill_act.sa_mask = all_masked;
207
208 sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
209 sigaction(SIGILL, &ill_act, &ill_oact);
210
211 /* If we used getauxval, we already have all the values */
212 # ifndef OSSL_IMPLEMENT_GETAUXVAL
213 if (sigsetjmp(ill_jmp, 1) == 0) {
214 _armv7_neon_probe();
215 OPENSSL_armcap_P |= ARMV7_NEON;
216 if (sigsetjmp(ill_jmp, 1) == 0) {
217 _armv8_pmull_probe();
218 OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
219 } else if (sigsetjmp(ill_jmp, 1) == 0) {
220 _armv8_aes_probe();
221 OPENSSL_armcap_P |= ARMV8_AES;
222 }
223 if (sigsetjmp(ill_jmp, 1) == 0) {
224 _armv8_sha1_probe();
225 OPENSSL_armcap_P |= ARMV8_SHA1;
226 }
227 if (sigsetjmp(ill_jmp, 1) == 0) {
228 _armv8_sha256_probe();
229 OPENSSL_armcap_P |= ARMV8_SHA256;
230 }
231 # if defined(__aarch64__) && !defined(__APPLE__)
232 if (sigsetjmp(ill_jmp, 1) == 0) {
233 _armv8_sha512_probe();
234 OPENSSL_armcap_P |= ARMV8_SHA512;
235 }
236 # endif
237 }
238 # endif
239
240 /* Things that getauxval didn't tell us */
241 if (sigsetjmp(ill_jmp, 1) == 0) {
242 _armv7_tick();
243 OPENSSL_armcap_P |= ARMV7_TICK;
244 }
245
246 sigaction(SIGILL, &ill_oact, NULL);
247 sigprocmask(SIG_SETMASK, &oset, NULL);
248 }
249 #endif
250