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// Copyright 2016 The BoringSSL Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "internal.h"
#if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_ARM) && \
defined(OPENSSL_LINUX) && !defined(OPENSSL_STATIC_ARMCAP)
#include <errno.h>
#include <fcntl.h>
#include <sys/auxv.h>
#include <sys/types.h>
#include <unistd.h>
#include <string_view>
#include <contrib/restricted/google/boringssl/include/openssl/mem.h>
#include "cpu_arm_linux.h"
using namespace bssl;
static int open_eintr(const char *path, int flags) {
int ret;
do {
ret = open(path, flags);
} while (ret < 0 && errno == EINTR);
return ret;
}
static ssize_t read_eintr(int fd, void *out, size_t len) {
ssize_t ret;
do {
ret = read(fd, out, len);
} while (ret < 0 && errno == EINTR);
return ret;
}
// read_file opens |path| and reads until end-of-file. On success, it returns
// one and sets |*out_ptr| and |*out_len| to a newly-allocated buffer with the
// contents. Otherwise, it returns zero.
static int read_file(char **out_ptr, size_t *out_len, const char *path) {
int fd = open_eintr(path, O_RDONLY);
if (fd < 0) {
return 0;
}
static const size_t kReadSize = 1024;
int ret = 0;
size_t cap = kReadSize, len = 0;
char *buf = reinterpret_cast<char *>(OPENSSL_malloc(cap));
if (buf == nullptr) {
goto err;
}
for (;;) {
if (cap - len < kReadSize) {
size_t new_cap = cap * 2;
if (new_cap < cap) {
goto err;
}
char *new_buf = reinterpret_cast<char *>(OPENSSL_realloc(buf, new_cap));
if (new_buf == nullptr) {
goto err;
}
buf = new_buf;
cap = new_cap;
}
ssize_t bytes_read = read_eintr(fd, buf + len, kReadSize);
if (bytes_read < 0) {
goto err;
}
if (bytes_read == 0) {
break;
}
len += bytes_read;
}
*out_ptr = buf;
*out_len = len;
ret = 1;
buf = nullptr;
err:
OPENSSL_free(buf);
close(fd);
return ret;
}
static int g_needs_hwcap2_workaround;
void bssl::OPENSSL_cpuid_setup() {
// Matching OpenSSL, only report other features if NEON is present.
unsigned long hwcap = getauxval(AT_HWCAP);
if (hwcap & CRYPTO_HWCAP_NEON) {
#if defined(HWCAP_ARM_NEON)
static_assert(HWCAP_ARM_NEON == CRYPTO_HWCAP_NEON,
"CRYPTO_HWCAP values must match Linux");
#endif
BSSL_armcap_P |= ARMV7_NEON;
// Some ARMv8 Android devices don't expose AT_HWCAP2. Fall back to
// /proc/cpuinfo. See https://crbug.com/40644934. The fix was added to
// Android CTS in N, so, after Net.NeedsHWCAP2Workaround confirms this, we
// should be able to disable this when __ANDROID_MIN_SDK_VERSION__ is high
// enough. (It may not be worth carrying the workaround at all at that
// point. Then again, AES and PMULL extensions are crucial for performance
// when available.)
unsigned long hwcap2 = getauxval(AT_HWCAP2);
if (hwcap2 == 0) {
char *cpuinfo_data = nullptr;
size_t cpuinfo_len = 0;
if (read_file(&cpuinfo_data, &cpuinfo_len, "/proc/cpuinfo")) {
hwcap2 = armcap::GetHWCAP2FromCpuinfo(
std::string_view(cpuinfo_data, cpuinfo_len));
g_needs_hwcap2_workaround = hwcap2 != 0;
OPENSSL_free(cpuinfo_data);
}
}
// HWCAP2_* values, without the "CRYPTO_" prefix, are exposed through
// <sys/auxv.h> in some versions of glibc(>= 2.41). Assert that we don't
// diverge from those values.
if (hwcap2 & CRYPTO_HWCAP2_AES) {
#if defined(HWCAP2_AES)
static_assert(HWCAP2_AES == CRYPTO_HWCAP2_AES,
"CRYPTO_HWCAP2 values must match Linux");
#endif
BSSL_armcap_P |= ARMV8_AES;
}
if (hwcap2 & CRYPTO_HWCAP2_PMULL) {
#if defined(HWCAP2_PMULL)
static_assert(HWCAP2_PMULL == CRYPTO_HWCAP2_PMULL,
"CRYPTO_HWCAP2 values must match Linux");
#endif
BSSL_armcap_P |= ARMV8_PMULL;
}
if (hwcap2 & CRYPTO_HWCAP2_SHA1) {
#if defined(HWCAP2_SHA1)
static_assert(HWCAP2_SHA1 == CRYPTO_HWCAP2_SHA1,
"CRYPTO_HWCAP2 values must match Linux");
#endif
BSSL_armcap_P |= ARMV8_SHA1;
}
if (hwcap2 & CRYPTO_HWCAP2_SHA2) {
#if defined(HWCAP2_SHA2)
static_assert(HWCAP2_SHA2 == CRYPTO_HWCAP2_SHA2,
"CRYPTO_HWCAP2 values must match Linux");
#endif
BSSL_armcap_P |= ARMV8_SHA256;
}
}
}
int CRYPTO_has_broken_NEON() { return 0; }
int CRYPTO_needs_hwcap2_workaround() {
OPENSSL_init_cpuid();
return g_needs_hwcap2_workaround;
}
#endif // OPENSSL_ARM && OPENSSL_LINUX && !OPENSSL_STATIC_ARMCAP
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