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/* $OpenBSD: armcap.c,v 1.7 2018/11/11 03:27:56 bcook Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <signal.h>
#include <openssl/crypto.h>
#include "arm_arch.h"
unsigned int OPENSSL_armcap_P;
#if __ARM_ARCH__ >= 7
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);
#endif
#if defined(__GNUC__) && __GNUC__>=2
void OPENSSL_cpuid_setup(void) __attribute__((constructor));
#endif
void
OPENSSL_cpuid_setup(void)
{
#if __ARM_ARCH__ >= 7
struct sigaction ill_oact, ill_act;
sigset_t oset;
#endif
static int trigger = 0;
if (trigger)
return;
trigger = 1;
OPENSSL_armcap_P = 0;
#if __ARM_ARCH__ >= 7
sigfillset(&all_masked);
sigdelset(&all_masked, SIGILL);
sigdelset(&all_masked, SIGTRAP);
sigdelset(&all_masked, SIGFPE);
sigdelset(&all_masked, SIGBUS);
sigdelset(&all_masked, SIGSEGV);
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;
}
sigaction (SIGILL, &ill_oact, NULL);
sigprocmask(SIG_SETMASK, &oset, NULL);
#endif
}
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