mirror of
https://github.com/AntelopeIO/boringssl.git
synced 2026-07-21 14:43:53 +00:00
David Benjamin
74a75b3959
https://crrev.com/c/4415225 had to react to us querying these. Add a comment so we can fix this proactively in the future. Bug: chromium:1432323 Change-Id: I2ffe4d90e32215b521815a25f3448502da2156bf Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/59925 Reviewed-by: Adam Langley <agl@google.com>
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/* Copyright (c) 2021, 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 "internal.h"
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#if defined(OPENSSL_AARCH64) && defined(OPENSSL_APPLE) && \
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!defined(OPENSSL_STATIC_ARMCAP)
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include <openssl/arm_arch.h>
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extern uint32_t OPENSSL_armcap_P;
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static int has_hw_feature(const char *name) {
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int value;
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size_t len = sizeof(value);
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if (sysctlbyname(name, &value, &len, NULL, 0) != 0) {
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return 0;
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}
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if (len != sizeof(int)) {
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// This should not happen. All the values queried should be integer-valued.
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assert(0);
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return 0;
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}
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// Per sys/sysctl.h:
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//
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// Selectors that return errors are not support on the system. Supported
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// features will return 1 if they are recommended or 0 if they are supported
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// but are not expected to help performance. Future versions of these
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// selectors may return larger values as necessary so it is best to test for
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// non zero.
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return value != 0;
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}
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void OPENSSL_cpuid_setup(void) {
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// Apple ARM64 platforms have NEON and cryptography extensions available
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// statically, so we do not need to query them. In particular, there sometimes
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// are no sysctls corresponding to such features. See below.
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#if !defined(__ARM_NEON) || !defined(__ARM_FEATURE_AES) || \
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!defined(__ARM_FEATURE_SHA2)
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#error "NEON and crypto extensions should be statically available."
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#endif
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OPENSSL_armcap_P =
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ARMV7_NEON | ARMV8_AES | ARMV8_PMULL | ARMV8_SHA1 | ARMV8_SHA256;
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// See Apple's documentation for sysctl names:
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// https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics
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//
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// The new feature names, e.g. "hw.optional.arm.FEAT_SHA512", are only
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// available in macOS 12. For compatibility with macOS 11, we also support
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// the old names. The old names don't have values for features like FEAT_AES,
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// so instead we detect them statically above.
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//
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// If querying new sysctls, update the Chromium sandbox definition. See
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// https://crrev.com/c/4415225.
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if (has_hw_feature("hw.optional.arm.FEAT_SHA512") ||
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has_hw_feature("hw.optional.armv8_2_sha512")) {
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OPENSSL_armcap_P |= ARMV8_SHA512;
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}
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}
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#endif // OPENSSL_AARCH64 && OPENSSL_APPLE && !OPENSSL_STATIC_ARMCAP
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