| 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 | !SANITIZER_GO |
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| 27 | # define SANITIZER_USE_GETAUXVAL 1 |
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| 28 | # else |
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| 29 | # define SANITIZER_USE_GETAUXVAL 0 |
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| 30 | # endif |
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| 31 | |
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| 32 | # if SANITIZER_USE_GETAUXVAL |
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| 33 | # include <sys/auxv.h> |
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| 34 | # else |
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| 35 | // The weak getauxval definition allows to check for the function at runtime. |
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| 36 | // This is useful for Android, when compiled at a lower API level yet running |
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| 37 | // on a more recent platform that offers the function. |
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| 38 | extern "C" SANITIZER_WEAK_ATTRIBUTE unsigned long getauxval(unsigned long type); |
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| 39 | # endif |
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| 40 | |
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| 41 | #elif SANITIZER_NETBSD |
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| 42 | |
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| 43 | #define SANITIZER_USE_GETAUXVAL 1 |
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| 44 | |
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| 45 | #include <dlfcn.h> |
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| 46 | #include <elf.h> |
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| 47 | |
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| 48 | static inline decltype(AuxInfo::a_v) getauxval(decltype(AuxInfo::a_type) type) { |
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| 49 | for (const AuxInfo *aux = (const AuxInfo *)_dlauxinfo(); |
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| 50 | aux->a_type != AT_NULL; ++aux) { |
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| 51 | if (type == aux->a_type) |
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| 52 | return aux->a_v; |
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| 53 | } |
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| 54 | |
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| 55 | return 0; |
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| 56 | } |
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| 57 | |
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| 58 | #endif |
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| 59 | |
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| 60 | #endif // SANITIZER_GETAUXVAL_H |
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| 61 | |
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