d749af7ab1
The Android SDK version against which Chromium builds is too old to include sys/auxv.h. This change switches the ARM code to use a weak pointer for getauxval and to hard code the aux value numbers. It also switches the license on cpu-arm.c because there's no OpenSSL left in there now. Change-Id: I440cb9d533a06d8b245b189d8e5148fa33e29412 Reviewed-on: https://boringssl-review.googlesource.com/2880 Reviewed-by: David Benjamin <davidben@chromium.org> Reviewed-by: Adam Langley <agl@google.com>
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/* Copyright (c) 2014, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/cpu.h>
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#if defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
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#include <inttypes.h>
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#include <stdio.h>
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#include "arm_arch.h"
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/* We can't include <sys/auxv.h> because the Android SDK version against which
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* Chromium builds is too old to have it. Instead we define all the constants
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* that we need and have a weak pointer to getauxval. */
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unsigned long getauxval(unsigned long type) __attribute__((weak));
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static const unsigned long AT_HWCAP = 16;
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static const unsigned long AT_HWCAP2 = 26;
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char CRYPTO_is_NEON_capable(void) {
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return (OPENSSL_armcap_P & ARMV7_NEON) != 0;
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}
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void CRYPTO_set_NEON_capable(char neon_capable) {
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if (neon_capable) {
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OPENSSL_armcap_P |= ARMV7_NEON;
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} else {
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OPENSSL_armcap_P &= ~ARMV7_NEON;
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}
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}
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char CRYPTO_is_NEON_functional(void) {
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static const uint32_t kWantFlags = ARMV7_NEON | ARMV7_NEON_FUNCTIONAL;
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return (OPENSSL_armcap_P & kWantFlags) == kWantFlags;
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}
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void CRYPTO_set_NEON_functional(char neon_functional) {
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if (neon_functional) {
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OPENSSL_armcap_P |= ARMV7_NEON_FUNCTIONAL;
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} else {
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OPENSSL_armcap_P &= ~ARMV7_NEON_FUNCTIONAL;
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}
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}
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void OPENSSL_cpuid_setup(void) {
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if (getauxval == NULL) {
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return;
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}
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unsigned long hwcap = getauxval(AT_HWCAP);
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#if defined(OPENSSL_ARM)
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static const unsigned long kNEON = 1 << 12;
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if ((hwcap & kNEON) == 0) {
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return;
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}
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/* In 32-bit mode, the ARMv8 feature bits are in a different aux vector
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* value. */
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hwcap = getauxval(AT_HWCAP2);
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/* See /usr/include/asm/hwcap.h on an ARM installation for the source of
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* these values. */
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static const unsigned long kAES = 1 << 0;
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static const unsigned long kPMULL = 1 << 1;
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static const unsigned long kSHA1 = 1 << 2;
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static const unsigned long kSHA256 = 1 << 3;
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#elif defined(OPENSSL_AARCH64)
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/* See /usr/include/asm/hwcap.h on an aarch64 installation for the source of
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* these values. */
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static const unsigned long kNEON = 1 << 1;
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static const unsigned long kAES = 1 << 3;
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static const unsigned long kPMULL = 1 << 4;
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static const unsigned long kSHA1 = 1 << 5;
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static const unsigned long kSHA256 = 1 << 6;
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if ((hwcap & kNEON) == 0) {
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return;
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}
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#endif
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OPENSSL_armcap_P |= ARMV7_NEON | ARMV7_NEON_FUNCTIONAL;
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if (hwcap & kAES) {
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OPENSSL_armcap_P |= ARMV8_AES;
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}
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if (hwcap & kPMULL) {
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OPENSSL_armcap_P |= ARMV8_PMULL;
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}
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if (hwcap & kSHA1) {
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OPENSSL_armcap_P |= ARMV8_SHA1;
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}
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if (hwcap & kSHA256) {
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OPENSSL_armcap_P |= ARMV8_SHA256;
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}
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}
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#endif /* defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64) */
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