Add additional DigestInfo checks.
[openssl.git] / crypto / armcap.c
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <setjmp.h>
5 #include <signal.h>
6 #include <crypto.h>
7
8 #include "arm_arch.h"
9
10 unsigned int OPENSSL_armcap_P;
11
12 static sigset_t all_masked;
13
14 static sigjmp_buf ill_jmp;
15 static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
16
17 /*
18  * Following subroutines could have been inlined, but it's not all
19  * ARM compilers support inline assembler...
20  */
21 void _armv7_neon_probe(void);
22 unsigned int _armv7_tick(void);
23
24 unsigned int OPENSSL_rdtsc(void)
25         {
26         if (OPENSSL_armcap_P & ARMV7_TICK)
27                 return _armv7_tick();
28         else
29                 return 0;
30         }
31
32 #if defined(__GNUC__) && __GNUC__>=2
33 void OPENSSL_cpuid_setup(void) __attribute__((constructor));
34 #endif
35 void OPENSSL_cpuid_setup(void)
36         {
37         char *e;
38         struct sigaction        ill_oact,ill_act;
39         sigset_t                oset;
40         static int trigger=0;
41
42         if (trigger) return;
43         trigger=1;
44  
45         if ((e=getenv("OPENSSL_armcap")))
46                 {
47                 OPENSSL_armcap_P=strtoul(e,NULL,0);
48                 return;
49                 }
50
51         sigfillset(&all_masked);
52         sigdelset(&all_masked,SIGILL);
53         sigdelset(&all_masked,SIGTRAP);
54         sigdelset(&all_masked,SIGFPE);
55         sigdelset(&all_masked,SIGBUS);
56         sigdelset(&all_masked,SIGSEGV);
57
58         OPENSSL_armcap_P = 0;
59
60         memset(&ill_act,0,sizeof(ill_act));
61         ill_act.sa_handler = ill_handler;
62         ill_act.sa_mask    = all_masked;
63
64         sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
65         sigaction(SIGILL,&ill_act,&ill_oact);
66
67         if (sigsetjmp(ill_jmp,1) == 0)
68                 {
69                 _armv7_neon_probe();
70                 OPENSSL_armcap_P |= ARMV7_NEON;
71                 }
72         if (sigsetjmp(ill_jmp,1) == 0)
73                 {
74                 _armv7_tick();
75                 OPENSSL_armcap_P |= ARMV7_TICK;
76                 }
77
78         sigaction (SIGILL,&ill_oact,NULL);
79         sigprocmask(SIG_SETMASK,&oset,NULL);
80         }