diff options
Diffstat (limited to 'crypto/armcap.c')
-rw-r--r-- | crypto/armcap.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/crypto/armcap.c b/crypto/armcap.c new file mode 100644 index 0000000000..74c2c57295 --- /dev/null +++ b/crypto/armcap.c @@ -0,0 +1,77 @@ +#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; + } + +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); + } |