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#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);
void _armv8_aes_probe(void);
void _armv8_sha1_probe(void);
void _armv8_sha256_probe(void);
void _armv8_pmull_probe(void);
unsigned long _armv7_tick(void);
unsigned long OPENSSL_rdtsc(void)
{
if (OPENSSL_armcap_P & ARMV7_TICK)
return _armv7_tick();
else
return 0;
}
/*
* Use a weak reference to getauxval() so we can use it if it is available but
* don't break the build if it is not.
*/
#if defined(__GNUC__) && __GNUC__>=2
void OPENSSL_cpuid_setup(void) __attribute__((constructor));
extern unsigned long getauxval(unsigned long type) __attribute__((weak));
#else
static unsigned long (*getauxval)(unsigned long) = NULL;
#endif
/*
* ARM puts the the feature bits for Crypto Extensions in AT_HWCAP2, whereas
* AArch64 used AT_HWCAP.
*/
#if defined(__arm__) || defined (__arm)
# define HWCAP 16 /* AT_HWCAP */
# define HWCAP_NEON (1 << 12)
# define HWCAP_CE 26 /* AT_HWCAP2 */
# define HWCAP_CE_AES (1 << 0)
# define HWCAP_CE_PMULL (1 << 1)
# define HWCAP_CE_SHA1 (1 << 2)
# define HWCAP_CE_SHA256 (1 << 3)
#elif defined(__aarch64__)
# define HWCAP 16 /* AT_HWCAP */
# define HWCAP_NEON (1 << 1)
# define HWCAP_CE HWCAP
# define HWCAP_CE_AES (1 << 3)
# define HWCAP_CE_PMULL (1 << 4)
# define HWCAP_CE_SHA1 (1 << 5)
# define HWCAP_CE_SHA256 (1 << 6)
#endif
#ifdef ANDROID
// Works around a bug where Android versions up to and including L don't
// properly restore the signal mask when asked.
#define sigsetjmp(env,savesigs) \
(sigprocmask(SIG_SETMASK,&ill_act.sa_mask,NULL), \
sigsetjmp(env,savesigs))
#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=(unsigned int)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 (getauxval != NULL)
{
if (getauxval(HWCAP) & HWCAP_NEON)
{
unsigned long hwcap = getauxval(HWCAP_CE);
OPENSSL_armcap_P |= ARMV7_NEON;
if (hwcap & HWCAP_CE_AES)
OPENSSL_armcap_P |= ARMV8_AES;
if (hwcap & HWCAP_CE_PMULL)
OPENSSL_armcap_P |= ARMV8_PMULL;
if (hwcap & HWCAP_CE_SHA1)
OPENSSL_armcap_P |= ARMV8_SHA1;
if (hwcap & HWCAP_CE_SHA256)
OPENSSL_armcap_P |= ARMV8_SHA256;
}
}
else if (sigsetjmp(ill_jmp,1) == 0)
{
_armv7_neon_probe();
OPENSSL_armcap_P |= ARMV7_NEON;
if (sigsetjmp(ill_jmp,1) == 0)
{
_armv8_pmull_probe();
OPENSSL_armcap_P |= ARMV8_PMULL|ARMV8_AES;
}
else if (sigsetjmp(ill_jmp,1) == 0)
{
_armv8_aes_probe();
OPENSSL_armcap_P |= ARMV8_AES;
}
if (sigsetjmp(ill_jmp,1) == 0)
{
_armv8_sha1_probe();
OPENSSL_armcap_P |= ARMV8_SHA1;
}
if (sigsetjmp(ill_jmp,1) == 0)
{
_armv8_sha256_probe();
OPENSSL_armcap_P |= ARMV8_SHA256;
}
}
if (sigsetjmp(ill_jmp,1) == 0)
{
_armv7_tick();
OPENSSL_armcap_P |= ARMV7_TICK;
}
sigaction (SIGILL,&ill_oact,NULL);
sigprocmask(SIG_SETMASK,&oset,NULL);
}
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