e8d93e342b
armcap.c is shared between 32- and 64-bit builds and features link-time detection of getauxval. Submitted by: Ard Biesheuvel.
157 lines
3.5 KiB
C
157 lines
3.5 KiB
C
#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) { siglongjmp(ill_jmp,sig); }
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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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void _armv8_aes_probe(void);
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void _armv8_sha1_probe(void);
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void _armv8_sha256_probe(void);
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void _armv8_pmull_probe(void);
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unsigned long _armv7_tick(void);
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unsigned long 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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/*
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* Use a weak reference to getauxval() so we can use it if it is available but
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* don't break the build if it is not.
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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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extern unsigned long getauxval(unsigned long type) __attribute__((weak));
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#else
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static unsigned long (*getauxval)(unsigned long) = NULL;
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#endif
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/*
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* ARM puts the the feature bits for Crypto Extensions in AT_HWCAP2, whereas
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* AArch64 used AT_HWCAP.
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*/
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#if defined(__arm__) || defined (__arm)
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# define HWCAP 16 /* AT_HWCAP */
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# define HWCAP_NEON (1 << 12)
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# define HWCAP_CE 26 /* AT_HWCAP2 */
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# define HWCAP_CE_AES (1 << 0)
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# define HWCAP_CE_PMULL (1 << 1)
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# define HWCAP_CE_SHA1 (1 << 2)
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# define HWCAP_CE_SHA256 (1 << 3)
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#elif defined(__aarch64__)
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# define HWCAP 16 /* AT_HWCAP */
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# define HWCAP_NEON (1 << 1)
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# define HWCAP_CE HWCAP
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# define HWCAP_CE_AES (1 << 3)
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# define HWCAP_CE_PMULL (1 << 4)
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# define HWCAP_CE_SHA1 (1 << 5)
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# define HWCAP_CE_SHA256 (1 << 6)
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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) return;
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trigger=1;
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if ((e=getenv("OPENSSL_armcap")))
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{
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OPENSSL_armcap_P=(unsigned int)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 (getauxval != NULL)
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{
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if (getauxval(HWCAP) & HWCAP_NEON)
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{
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unsigned long hwcap = getauxval(HWCAP_CE);
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OPENSSL_armcap_P |= ARMV7_NEON;
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if (hwcap & HWCAP_CE_AES)
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OPENSSL_armcap_P |= ARMV8_AES;
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if (hwcap & HWCAP_CE_PMULL)
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OPENSSL_armcap_P |= ARMV8_PMULL;
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if (hwcap & HWCAP_CE_SHA1)
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OPENSSL_armcap_P |= ARMV8_SHA1;
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if (hwcap & HWCAP_CE_SHA256)
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OPENSSL_armcap_P |= ARMV8_SHA256;
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}
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}
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else if (sigsetjmp(ill_jmp,1) == 0)
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{
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_armv7_neon_probe();
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OPENSSL_armcap_P |= ARMV7_NEON;
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if (sigsetjmp(ill_jmp,1) == 0)
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{
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_armv8_pmull_probe();
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OPENSSL_armcap_P |= ARMV8_PMULL|ARMV8_AES;
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}
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else if (sigsetjmp(ill_jmp,1) == 0)
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{
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_armv8_aes_probe();
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OPENSSL_armcap_P |= ARMV8_AES;
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}
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if (sigsetjmp(ill_jmp,1) == 0)
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{
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_armv8_sha1_probe();
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OPENSSL_armcap_P |= ARMV8_SHA1;
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}
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if (sigsetjmp(ill_jmp,1) == 0)
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{
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_armv8_sha256_probe();
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OPENSSL_armcap_P |= ARMV8_SHA256;
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}
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}
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if (sigsetjmp(ill_jmp,1) == 0)
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{
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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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