3ca75cd550
2019-11-05 Martin Liska <mliska@suse.cz> * all source files: Merge from upstream r375507. From-SVN: r277834
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
//===-- sanitizer_getauxval.h -----------------------------------*- 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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// Common getauxval() guards and definitions.
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// getauxval() is not defined until glibc version 2.16, or until API level 21
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// for Android.
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// Implement the getauxval() compat function for NetBSD.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_GETAUXVAL_H
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#define SANITIZER_GETAUXVAL_H
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#include "sanitizer_platform.h"
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#include "sanitizer_glibc_version.h"
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#if SANITIZER_LINUX || SANITIZER_FUCHSIA
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# if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \
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SANITIZER_FUCHSIA
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# define SANITIZER_USE_GETAUXVAL 1
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# else
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# define SANITIZER_USE_GETAUXVAL 0
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# endif
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# if SANITIZER_USE_GETAUXVAL
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# include <sys/auxv.h>
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# else
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// The weak getauxval definition allows to check for the function at runtime.
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// This is useful for Android, when compiled at a lower API level yet running
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// on a more recent platform that offers the function.
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extern "C" SANITIZER_WEAK_ATTRIBUTE unsigned long getauxval(unsigned long type);
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# endif
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#elif SANITIZER_NETBSD
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#define SANITIZER_USE_GETAUXVAL 1
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#include <dlfcn.h>
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#include <elf.h>
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static inline decltype(AuxInfo::a_v) getauxval(decltype(AuxInfo::a_type) type) {
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for (const AuxInfo *aux = (const AuxInfo *)_dlauxinfo();
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aux->a_type != AT_NULL; ++aux) {
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if (type == aux->a_type)
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return aux->a_v;
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}
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return 0;
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}
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#endif
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#endif // SANITIZER_GETAUXVAL_H
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