diff options
Diffstat (limited to 'compiler-rt/lib/scudo/standalone/checksum.cpp')
-rw-r--r-- | compiler-rt/lib/scudo/standalone/checksum.cpp | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/compiler-rt/lib/scudo/standalone/checksum.cpp b/compiler-rt/lib/scudo/standalone/checksum.cpp new file mode 100644 index 000000000000..f713f5a81609 --- /dev/null +++ b/compiler-rt/lib/scudo/standalone/checksum.cpp @@ -0,0 +1,70 @@ +//===-- 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 +} +#endif // defined(__x86_64__) || defined(__i386__) + +} // namespace scudo |