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82 lines
1.7 KiB
82 lines
1.7 KiB
4 years ago
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <crypto.h>
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#include "arm_arch.h"
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unsigned int OPENSSL_armcap_P;
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static sigset_t all_masked;
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static sigjmp_buf ill_jmp;
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static void ill_handler(int sig)
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{
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siglongjmp(ill_jmp, sig);
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}
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/*
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* Following subroutines could have been inlined, but it's not all
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* ARM compilers support inline assembler...
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*/
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void _armv7_neon_probe(void);
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unsigned int _armv7_tick(void);
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unsigned int OPENSSL_rdtsc(void)
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{
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if (OPENSSL_armcap_P & ARMV7_TICK)
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return _armv7_tick();
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else
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return 0;
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}
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#if defined(__GNUC__) && __GNUC__>=2
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void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
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#endif
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void OPENSSL_cpuid_setup(void)
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{
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char *e;
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struct sigaction ill_oact, ill_act;
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sigset_t oset;
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static int trigger = 0;
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if (trigger)
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return;
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trigger = 1;
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if ((e = getenv("OPENSSL_armcap"))) {
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OPENSSL_armcap_P = strtoul(e, NULL, 0);
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return;
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}
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sigfillset(&all_masked);
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sigdelset(&all_masked, SIGILL);
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sigdelset(&all_masked, SIGTRAP);
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sigdelset(&all_masked, SIGFPE);
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sigdelset(&all_masked, SIGBUS);
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sigdelset(&all_masked, SIGSEGV);
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OPENSSL_armcap_P = 0;
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memset(&ill_act, 0, sizeof(ill_act));
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ill_act.sa_handler = ill_handler;
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ill_act.sa_mask = all_masked;
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sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
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sigaction(SIGILL, &ill_act, &ill_oact);
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if (sigsetjmp(ill_jmp, 1) == 0) {
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_armv7_neon_probe();
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OPENSSL_armcap_P |= ARMV7_NEON;
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}
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if (sigsetjmp(ill_jmp, 1) == 0) {
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_armv7_tick();
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OPENSSL_armcap_P |= ARMV7_TICK;
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}
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sigaction(SIGILL, &ill_oact, NULL);
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sigprocmask(SIG_SETMASK, &oset, NULL);
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}
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