forked from OSchip/llvm-project
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
//===-- checksum.cpp --------------------------------------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "checksum.h"
|
|
#include "atomic_helpers.h"
|
|
|
|
#if defined(__x86_64__) || defined(__i386__)
|
|
#include <cpuid.h>
|
|
#elif defined(__arm__) || defined(__aarch64__)
|
|
#if SCUDO_FUCHSIA
|
|
#include <zircon/features.h>
|
|
#include <zircon/syscalls.h>
|
|
#else
|
|
#include <sys/auxv.h>
|
|
#endif
|
|
#endif
|
|
|
|
namespace scudo {
|
|
|
|
Checksum HashAlgorithm = {Checksum::BSD};
|
|
|
|
#if defined(__x86_64__) || defined(__i386__)
|
|
// i386 and x86_64 specific code to detect CRC32 hardware support via CPUID.
|
|
// CRC32 requires the SSE 4.2 instruction set.
|
|
#ifndef bit_SSE4_2
|
|
#define bit_SSE4_2 bit_SSE42 // clang and gcc have different defines.
|
|
#endif
|
|
|
|
bool hasHardwareCRC32() {
|
|
u32 Eax, Ebx = 0, Ecx = 0, Edx = 0;
|
|
__get_cpuid(0, &Eax, &Ebx, &Ecx, &Edx);
|
|
const bool IsIntel = (Ebx == signature_INTEL_ebx) &&
|
|
(Edx == signature_INTEL_edx) &&
|
|
(Ecx == signature_INTEL_ecx);
|
|
const bool IsAMD = (Ebx == signature_AMD_ebx) && (Edx == signature_AMD_edx) &&
|
|
(Ecx == signature_AMD_ecx);
|
|
if (!IsIntel && !IsAMD)
|
|
return false;
|
|
__get_cpuid(1, &Eax, &Ebx, &Ecx, &Edx);
|
|
return !!(Ecx & bit_SSE4_2);
|
|
}
|
|
#elif defined(__arm__) || defined(__aarch64__)
|
|
#ifndef AT_HWCAP
|
|
#define AT_HWCAP 16
|
|
#endif
|
|
#ifndef HWCAP_CRC32
|
|
#define HWCAP_CRC32 (1U << 7) // HWCAP_CRC32 is missing on older platforms.
|
|
#endif
|
|
|
|
bool hasHardwareCRC32() {
|
|
#if SCUDO_FUCHSIA
|
|
u32 HWCap;
|
|
const zx_status_t Status =
|
|
zx_system_get_features(ZX_FEATURE_KIND_CPU, &HWCap);
|
|
if (Status != ZX_OK)
|
|
return false;
|
|
return !!(HWCap & ZX_ARM64_FEATURE_ISA_CRC32);
|
|
#else
|
|
return !!(getauxval(AT_HWCAP) & HWCAP_CRC32);
|
|
#endif // SCUDO_FUCHSIA
|
|
}
|
|
#else
|
|
// No hardware CRC32 implemented in Scudo for other architectures.
|
|
bool hasHardwareCRC32() { return false; }
|
|
#endif // defined(__x86_64__) || defined(__i386__)
|
|
|
|
} // namespace scudo
|