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