armcap.c revision 31cf9ecd5035e6b5e8640ec5cc0c3f022e7f6895 
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
10unsigned int OPENSSL_armcap_P;
11
12static sigset_t all_masked;
13
14static sigjmp_buf ill_jmp;
15static 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 */
21void _armv7_neon_probe(void);
22unsigned int _armv7_tick(void);
23
24unsigned 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
33void OPENSSL_cpuid_setup(void) __attribute__((constructor));
34#endif
35void 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	}
81