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1 //===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // Common getauxval() guards and definitions.
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10 // getauxval() is not defined until glibc version 2.16, or until API level 21
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11 // for Android.
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12 // Implement the getauxval() compat function for NetBSD.
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #ifndef SANITIZER_GETAUXVAL_H
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17 #define SANITIZER_GETAUXVAL_H
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18
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19 #include "sanitizer_platform.h"
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20 #include "sanitizer_glibc_version.h"
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21
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22 #if SANITIZER_LINUX || SANITIZER_FUCHSIA
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23
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24 # if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \
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25 SANITIZER_FUCHSIA
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26 # define SANITIZER_USE_GETAUXVAL 1
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27 # else
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28 # define SANITIZER_USE_GETAUXVAL 0
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29 # endif
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30
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31 # if SANITIZER_USE_GETAUXVAL
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32 # include <sys/auxv.h>
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33 # else
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34 // The weak getauxval definition allows to check for the function at runtime.
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35 // This is useful for Android, when compiled at a lower API level yet running
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36 // on a more recent platform that offers the function.
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37 extern "C" SANITIZER_WEAK_ATTRIBUTE unsigned long getauxval(unsigned long type);
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38 # endif
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39
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40 #elif SANITIZER_NETBSD
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41
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42 #define SANITIZER_USE_GETAUXVAL 1
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43
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44 #include <dlfcn.h>
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45 #include <elf.h>
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46
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47 static inline decltype(AuxInfo::a_v) getauxval(decltype(AuxInfo::a_type) type) {
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48 for (const AuxInfo *aux = (const AuxInfo *)_dlauxinfo();
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49 aux->a_type != AT_NULL; ++aux) {
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50 if (type == aux->a_type)
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51 return aux->a_v;
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52 }
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53
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54 return 0;
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55 }
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56
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57 #endif
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58
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59 #endif // SANITIZER_GETAUXVAL_H
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