10 unsigned int OPENSSL_armcap_P;
12 static sigset_t all_masked;
14 static sigjmp_buf ill_jmp;
15 static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
18 * Following subroutines could have been inlined, but it's not all
19 * ARM compilers support inline assembler...
21 void _armv7_neon_probe(void);
22 void _armv8_aes_probe(void);
23 void _armv8_sha1_probe(void);
24 void _armv8_sha256_probe(void);
25 void _armv8_pmull_probe(void);
26 unsigned long _armv7_tick(void);
28 unsigned long OPENSSL_rdtsc(void)
30 if (OPENSSL_armcap_P & ARMV7_TICK)
37 * Use a weak reference to getauxval() so we can use it if it is available but
38 * don't break the build if it is not.
40 #if defined(__GNUC__) && __GNUC__>=2
41 void OPENSSL_cpuid_setup(void) __attribute__((constructor));
42 extern unsigned long getauxval(unsigned long type) __attribute__((weak));
44 static unsigned long (*getauxval)(unsigned long) = NULL;
48 * ARM puts the the feature bits for Crypto Extensions in AT_HWCAP2, whereas
49 * AArch64 used AT_HWCAP.
51 #if defined(__arm__) || defined (__arm)
52 # define HWCAP 16 /* AT_HWCAP */
53 # define HWCAP_NEON (1 << 12)
55 # define HWCAP_CE 26 /* AT_HWCAP2 */
56 # define HWCAP_CE_AES (1 << 0)
57 # define HWCAP_CE_PMULL (1 << 1)
58 # define HWCAP_CE_SHA1 (1 << 2)
59 # define HWCAP_CE_SHA256 (1 << 3)
60 #elif defined(__aarch64__)
61 # define HWCAP 16 /* AT_HWCAP */
62 # define HWCAP_NEON (1 << 1)
64 # define HWCAP_CE HWCAP
65 # define HWCAP_CE_AES (1 << 3)
66 # define HWCAP_CE_PMULL (1 << 4)
67 # define HWCAP_CE_SHA1 (1 << 5)
68 # define HWCAP_CE_SHA256 (1 << 6)
71 void OPENSSL_cpuid_setup(void)
74 struct sigaction ill_oact,ill_act;
81 if ((e=getenv("OPENSSL_armcap")))
83 OPENSSL_armcap_P=(unsigned int)strtoul(e,NULL,0);
87 sigfillset(&all_masked);
88 sigdelset(&all_masked,SIGILL);
89 sigdelset(&all_masked,SIGTRAP);
90 sigdelset(&all_masked,SIGFPE);
91 sigdelset(&all_masked,SIGBUS);
92 sigdelset(&all_masked,SIGSEGV);
96 memset(&ill_act,0,sizeof(ill_act));
97 ill_act.sa_handler = ill_handler;
98 ill_act.sa_mask = all_masked;
100 sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
101 sigaction(SIGILL,&ill_act,&ill_oact);
103 if (getauxval != NULL)
105 if (getauxval(HWCAP) & HWCAP_NEON)
107 unsigned long hwcap = getauxval(HWCAP_CE);
109 OPENSSL_armcap_P |= ARMV7_NEON;
111 if (hwcap & HWCAP_CE_AES)
112 OPENSSL_armcap_P |= ARMV8_AES;
114 if (hwcap & HWCAP_CE_PMULL)
115 OPENSSL_armcap_P |= ARMV8_PMULL;
117 if (hwcap & HWCAP_CE_SHA1)
118 OPENSSL_armcap_P |= ARMV8_SHA1;
120 if (hwcap & HWCAP_CE_SHA256)
121 OPENSSL_armcap_P |= ARMV8_SHA256;
124 else if (sigsetjmp(ill_jmp,1) == 0)
127 OPENSSL_armcap_P |= ARMV7_NEON;
128 if (sigsetjmp(ill_jmp,1) == 0)
130 _armv8_pmull_probe();
131 OPENSSL_armcap_P |= ARMV8_PMULL|ARMV8_AES;
133 else if (sigsetjmp(ill_jmp,1) == 0)
136 OPENSSL_armcap_P |= ARMV8_AES;
138 if (sigsetjmp(ill_jmp,1) == 0)
141 OPENSSL_armcap_P |= ARMV8_SHA1;
143 if (sigsetjmp(ill_jmp,1) == 0)
145 _armv8_sha256_probe();
146 OPENSSL_armcap_P |= ARMV8_SHA256;
149 if (sigsetjmp(ill_jmp,1) == 0)
152 OPENSSL_armcap_P |= ARMV7_TICK;
155 sigaction (SIGILL,&ill_oact,NULL);
156 sigprocmask(SIG_SETMASK,&oset,NULL);