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