| /* |
| * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the OpenSSL license (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <setjmp.h> |
| #include <signal.h> |
| #include <openssl/crypto.h> |
| #include "internal/cryptlib.h" |
| |
| #include "arm_arch.h" |
| |
| unsigned int OPENSSL_armcap_P = 0; |
| |
| #if __ARM_MAX_ARCH__<7 |
| void OPENSSL_cpuid_setup(void) |
| { |
| } |
| |
| uint32_t OPENSSL_rdtsc(void) |
| { |
| return 0; |
| } |
| #else |
| 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); |
| # ifdef __aarch64__ |
| void _armv8_sha512_probe(void); |
| # endif |
| uint32_t _armv7_tick(void); |
| |
| uint32_t OPENSSL_rdtsc(void) |
| { |
| if (OPENSSL_armcap_P & ARMV7_TICK) |
| return _armv7_tick(); |
| else |
| return 0; |
| } |
| |
| # if defined(__GNUC__) && __GNUC__>=2 |
| void OPENSSL_cpuid_setup(void) __attribute__ ((constructor)); |
| # endif |
| |
| # if defined(__GLIBC__) && defined(__GLIBC_PREREQ) |
| # if __GLIBC_PREREQ(2, 16) |
| # include <sys/auxv.h> |
| # define OSSL_IMPLEMENT_GETAUXVAL |
| # endif |
| # elif defined(__ANDROID_API__) |
| /* see https://developer.android.google.cn/ndk/guides/cpu-features */ |
| # if __ANDROID_API__ >= 18 |
| # include <sys/auxv.h> |
| # define OSSL_IMPLEMENT_GETAUXVAL |
| # endif |
| # endif |
| # if defined(__FreeBSD__) |
| # include <sys/param.h> |
| # if __FreeBSD_version >= 1200000 |
| # include <sys/auxv.h> |
| # define OSSL_IMPLEMENT_GETAUXVAL |
| |
| static unsigned long getauxval(unsigned long key) |
| { |
| unsigned long val = 0ul; |
| |
| if (elf_aux_info((int)key, &val, sizeof(val)) != 0) |
| return 0ul; |
| |
| return val; |
| } |
| # endif |
| # endif |
| |
| /* |
| * Android: according to https://developer.android.com/ndk/guides/cpu-features, |
| * getauxval is supported starting with API level 18 |
| */ |
| # if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18 |
| # include <sys/auxv.h> |
| # define OSSL_IMPLEMENT_GETAUXVAL |
| # endif |
| |
| /* |
| * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas |
| * AArch64 used AT_HWCAP. |
| */ |
| # ifndef AT_HWCAP |
| # define AT_HWCAP 16 |
| # endif |
| # ifndef AT_HWCAP2 |
| # define AT_HWCAP2 26 |
| # endif |
| # if defined(__arm__) || defined (__arm) |
| # define HWCAP AT_HWCAP |
| # define HWCAP_NEON (1 << 12) |
| |
| # define HWCAP_CE 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 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) |
| # define HWCAP_CE_SHA512 (1 << 21) |
| # endif |
| |
| void OPENSSL_cpuid_setup(void) |
| { |
| const 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; |
| } |
| |
| # if defined(__APPLE__) && !defined(__aarch64__) |
| /* |
| * Capability probing by catching SIGILL appears to be problematic |
| * on iOS. But since Apple universe is "monocultural", it's actually |
| * possible to simply set pre-defined processor capability mask. |
| */ |
| if (1) { |
| OPENSSL_armcap_P = ARMV7_NEON; |
| return; |
| } |
| /* |
| * One could do same even for __aarch64__ iOS builds. It's not done |
| * exclusively for reasons of keeping code unified across platforms. |
| * Unified code works because it never triggers SIGILL on Apple |
| * devices... |
| */ |
| # endif |
| |
| OPENSSL_armcap_P = 0; |
| |
| # ifdef OSSL_IMPLEMENT_GETAUXVAL |
| 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; |
| |
| # ifdef __aarch64__ |
| if (hwcap & HWCAP_CE_SHA512) |
| OPENSSL_armcap_P |= ARMV8_SHA512; |
| # endif |
| } |
| # endif |
| |
| sigfillset(&all_masked); |
| sigdelset(&all_masked, SIGILL); |
| sigdelset(&all_masked, SIGTRAP); |
| sigdelset(&all_masked, SIGFPE); |
| sigdelset(&all_masked, SIGBUS); |
| sigdelset(&all_masked, SIGSEGV); |
| |
| 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 we used getauxval, we already have all the values */ |
| # ifndef OSSL_IMPLEMENT_GETAUXVAL |
| 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 defined(__aarch64__) && !defined(__APPLE__) |
| if (sigsetjmp(ill_jmp, 1) == 0) { |
| _armv8_sha512_probe(); |
| OPENSSL_armcap_P |= ARMV8_SHA512; |
| } |
| # endif |
| } |
| # endif |
| |
| /* Things that getauxval didn't tell us */ |
| if (sigsetjmp(ill_jmp, 1) == 0) { |
| _armv7_tick(); |
| OPENSSL_armcap_P |= ARMV7_TICK; |
| } |
| |
| sigaction(SIGILL, &ill_oact, NULL); |
| sigprocmask(SIG_SETMASK, &oset, NULL); |
| } |
| #endif |