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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
135 lines
4.5 KiB
C++
135 lines
4.5 KiB
C++
//===-- scudo_utils.cpp -----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// Platform specific utility functions.
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///
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//===----------------------------------------------------------------------===//
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#include "scudo_utils.h"
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#if defined(__x86_64__) || defined(__i386__)
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# include <cpuid.h>
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#elif defined(__arm__) || defined(__aarch64__)
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# include "sanitizer_common/sanitizer_getauxval.h"
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# if SANITIZER_FUCHSIA
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# include <zircon/syscalls.h>
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# include <zircon/features.h>
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# elif SANITIZER_POSIX
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# include "sanitizer_common/sanitizer_posix.h"
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# include <fcntl.h>
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# endif
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#endif
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#include <stdarg.h>
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// TODO(kostyak): remove __sanitizer *Printf uses in favor for our own less
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// complicated string formatting code. The following is a
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// temporary workaround to be able to use __sanitizer::VSNPrintf.
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namespace __sanitizer {
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extern int VSNPrintf(char *buff, int buff_length, const char *format,
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va_list args);
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} // namespace __sanitizer
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namespace __scudo {
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FORMAT(1, 2) void NORETURN dieWithMessage(const char *Format, ...) {
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static const char ScudoError[] = "Scudo ERROR: ";
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static constexpr uptr PrefixSize = sizeof(ScudoError) - 1;
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// Our messages are tiny, 256 characters is more than enough.
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char Message[256];
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va_list Args;
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va_start(Args, Format);
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internal_memcpy(Message, ScudoError, PrefixSize);
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VSNPrintf(Message + PrefixSize, sizeof(Message) - PrefixSize, Format, Args);
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va_end(Args);
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LogMessageOnPrintf(Message);
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if (common_flags()->abort_on_error)
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SetAbortMessage(Message);
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RawWrite(Message);
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Die();
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}
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#if defined(__x86_64__) || defined(__i386__)
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// i386 and x86_64 specific code to detect CRC32 hardware support via CPUID.
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// CRC32 requires the SSE 4.2 instruction set.
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# ifndef bit_SSE4_2
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# define bit_SSE4_2 bit_SSE42 // clang and gcc have different defines.
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# endif
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bool hasHardwareCRC32() {
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u32 Eax, Ebx, Ecx, Edx;
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__get_cpuid(0, &Eax, &Ebx, &Ecx, &Edx);
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const bool IsIntel = (Ebx == signature_INTEL_ebx) &&
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(Edx == signature_INTEL_edx) &&
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(Ecx == signature_INTEL_ecx);
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const bool IsAMD = (Ebx == signature_AMD_ebx) &&
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(Edx == signature_AMD_edx) &&
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(Ecx == signature_AMD_ecx);
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if (!IsIntel && !IsAMD)
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return false;
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__get_cpuid(1, &Eax, &Ebx, &Ecx, &Edx);
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return !!(Ecx & bit_SSE4_2);
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}
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#elif defined(__arm__) || defined(__aarch64__)
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// For ARM and AArch64, hardware CRC32 support is indicated in the AT_HWCAP
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// auxiliary vector.
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# ifndef AT_HWCAP
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# define AT_HWCAP 16
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# endif
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# ifndef HWCAP_CRC32
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# define HWCAP_CRC32 (1 << 7) // HWCAP_CRC32 is missing on older platforms.
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# endif
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# if SANITIZER_POSIX
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bool hasHardwareCRC32ARMPosix() {
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uptr F = internal_open("/proc/self/auxv", O_RDONLY);
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if (internal_iserror(F))
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return false;
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struct { uptr Tag; uptr Value; } Entry = { 0, 0 };
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for (;;) {
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uptr N = internal_read(F, &Entry, sizeof(Entry));
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if (internal_iserror(N) || N != sizeof(Entry) ||
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(Entry.Tag == 0 && Entry.Value == 0) || Entry.Tag == AT_HWCAP)
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break;
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}
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internal_close(F);
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return (Entry.Tag == AT_HWCAP && (Entry.Value & HWCAP_CRC32) != 0);
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}
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# else
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bool hasHardwareCRC32ARMPosix() { return false; }
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# endif // SANITIZER_POSIX
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// Bionic doesn't initialize its globals early enough. This causes issues when
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// trying to access them from a preinit_array (b/25751302) or from another
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// constructor called before the libc one (b/68046352). __progname is
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// initialized after the other globals, so we can check its value to know if
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// calling getauxval is safe.
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extern "C" SANITIZER_WEAK_ATTRIBUTE char *__progname;
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INLINE bool areBionicGlobalsInitialized() {
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return !SANITIZER_ANDROID || (&__progname && __progname);
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}
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bool hasHardwareCRC32() {
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#if SANITIZER_FUCHSIA
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u32 HWCap;
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zx_status_t Status = zx_system_get_features(ZX_FEATURE_KIND_CPU, &HWCap);
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if (Status != ZX_OK || (HWCap & ZX_ARM64_FEATURE_ISA_CRC32) == 0)
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return false;
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return true;
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#else
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if (&getauxval && areBionicGlobalsInitialized())
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return !!(getauxval(AT_HWCAP) & HWCAP_CRC32);
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return hasHardwareCRC32ARMPosix();
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#endif // SANITIZER_FUCHSIA
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}
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#else
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bool hasHardwareCRC32() { return false; }
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#endif // defined(__x86_64__) || defined(__i386__)
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} // namespace __scudo
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