summaryrefslogtreecommitdiff
path: root/main/openssl/crypto/armcap.c
blob: 9abaf396e53e4f5f02a05639d66ccdd9cc023495 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <signal.h>
#include <crypto.h>

#include "arm_arch.h"

unsigned int OPENSSL_armcap_P;

static sigset_t all_masked;

static sigjmp_buf ill_jmp;
static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }

/*
 * Following subroutines could have been inlined, but it's not all
 * ARM compilers support inline assembler...
 */
void _armv7_neon_probe(void);
unsigned int _armv7_tick(void);

unsigned int OPENSSL_rdtsc(void)
	{
	if (OPENSSL_armcap_P & ARMV7_TICK)
		return _armv7_tick();
	else
		return 0;
	}

#if defined(__GNUC__) && __GNUC__>=2
void OPENSSL_cpuid_setup(void) __attribute__((constructor));
#endif
void OPENSSL_cpuid_setup(void)
	{
	char *e;
	struct sigaction	ill_oact,ill_act;
	sigset_t		oset;
	static int trigger=0;

	if (trigger) return;
	trigger=1;
 
	if ((e=getenv("OPENSSL_armcap")))
		{
		OPENSSL_armcap_P=strtoul(e,NULL,0);
		return;
		}

	sigfillset(&all_masked);
	sigdelset(&all_masked,SIGILL);
	sigdelset(&all_masked,SIGTRAP);
	sigdelset(&all_masked,SIGFPE);
	sigdelset(&all_masked,SIGBUS);
	sigdelset(&all_masked,SIGSEGV);

	OPENSSL_armcap_P = 0;

	memset(&ill_act,0,sizeof(ill_act));
	ill_act.sa_handler = ill_handler;
	ill_act.sa_mask    = all_masked;

	sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
	sigaction(SIGILL,&ill_act,&ill_oact);

	if (sigsetjmp(ill_jmp,1) == 0)
		{
		_armv7_neon_probe();
		OPENSSL_armcap_P |= ARMV7_NEON;
		}
	if (sigsetjmp(ill_jmp,1) == 0)
		{
		_armv7_tick();
		OPENSSL_armcap_P |= ARMV7_TICK;
		}

	sigaction (SIGILL,&ill_oact,NULL);
	sigprocmask(SIG_SETMASK,&oset,NULL);
	}