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comparison: toolkit/crashreporter/google-breakpad/src/common/linux/elfutils.h
toolkit/crashreporter/google-breakpad/src/common/linux/elfutils.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:3677764e20a4 |
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| 1 // Copyright (c) 2012, Google Inc. | |
| 2 // All rights reserved. | |
| 3 // | |
| 4 // Redistribution and use in source and binary forms, with or without | |
| 5 // modification, are permitted provided that the following conditions are | |
| 6 // met: | |
| 7 // | |
| 8 // * Redistributions of source code must retain the above copyright | |
| 9 // notice, this list of conditions and the following disclaimer. | |
| 10 // * Redistributions in binary form must reproduce the above | |
| 11 // copyright notice, this list of conditions and the following disclaimer | |
| 12 // in the documentation and/or other materials provided with the | |
| 13 // distribution. | |
| 14 // * Neither the name of Google Inc. nor the names of its | |
| 15 // contributors may be used to endorse or promote products derived from | |
| 16 // this software without specific prior written permission. | |
| 17 // | |
| 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 // | |
| 30 // elfutils.h: Utilities for dealing with ELF files. | |
| 31 // | |
| 32 | |
| 33 #ifndef COMMON_LINUX_ELFUTILS_H__ | |
| 34 #define COMMON_LINUX_ELFUTILS_H__ | |
| 35 | |
| 36 #include <elf.h> | |
| 37 #include <link.h> | |
| 38 #include <stdint.h> | |
| 39 | |
| 40 namespace google_breakpad { | |
| 41 | |
| 42 // Traits classes so consumers can write templatized code to deal | |
| 43 // with specific ELF bits. | |
| 44 struct ElfClass32 { | |
| 45 typedef Elf32_Addr Addr; | |
| 46 typedef Elf32_Ehdr Ehdr; | |
| 47 typedef Elf32_Nhdr Nhdr; | |
| 48 typedef Elf32_Phdr Phdr; | |
| 49 typedef Elf32_Shdr Shdr; | |
| 50 typedef Elf32_Half Half; | |
| 51 typedef Elf32_Off Off; | |
| 52 typedef Elf32_Word Word; | |
| 53 static const int kClass = ELFCLASS32; | |
| 54 static const size_t kAddrSize = sizeof(Elf32_Addr); | |
| 55 }; | |
| 56 | |
| 57 struct ElfClass64 { | |
| 58 typedef Elf64_Addr Addr; | |
| 59 typedef Elf64_Ehdr Ehdr; | |
| 60 typedef Elf64_Nhdr Nhdr; | |
| 61 typedef Elf64_Phdr Phdr; | |
| 62 typedef Elf64_Shdr Shdr; | |
| 63 typedef Elf64_Half Half; | |
| 64 typedef Elf64_Off Off; | |
| 65 typedef Elf64_Word Word; | |
| 66 static const int kClass = ELFCLASS64; | |
| 67 static const size_t kAddrSize = sizeof(Elf64_Addr); | |
| 68 }; | |
| 69 | |
| 70 bool IsValidElf(const void* elf_header); | |
| 71 int ElfClass(const void* elf_base); | |
| 72 | |
| 73 // Attempt to find a section named |section_name| of type |section_type| | |
| 74 // in the ELF binary data at |elf_mapped_base|. On success, returns true | |
| 75 // and sets |*section_start| to point to the start of the section data, | |
| 76 // and |*section_size| to the size of the section's data. If |elfclass| | |
| 77 // is not NULL, set |*elfclass| to the ELF file class. | |
| 78 bool FindElfSection(const void *elf_mapped_base, | |
| 79 const char *section_name, | |
| 80 uint32_t section_type, | |
| 81 const void **section_start, | |
| 82 int *section_size, | |
| 83 int *elfclass); | |
| 84 | |
| 85 // Internal helper method, exposed for convenience for callers | |
| 86 // that already have more info. | |
| 87 template<typename ElfClass> | |
| 88 const typename ElfClass::Shdr* | |
| 89 FindElfSectionByName(const char* name, | |
| 90 typename ElfClass::Word section_type, | |
| 91 const typename ElfClass::Shdr* sections, | |
| 92 const char* section_names, | |
| 93 const char* names_end, | |
| 94 int nsection); | |
| 95 | |
| 96 // Attempt to find the first segment of type |segment_type| in the ELF | |
| 97 // binary data at |elf_mapped_base|. On success, returns true and sets | |
| 98 // |*segment_start| to point to the start of the segment data, and | |
| 99 // and |*segment_size| to the size of the segment's data. If |elfclass| | |
| 100 // is not NULL, set |*elfclass| to the ELF file class. | |
| 101 bool FindElfSegment(const void *elf_mapped_base, | |
| 102 uint32_t segment_type, | |
| 103 const void **segment_start, | |
| 104 int *segment_size, | |
| 105 int *elfclass); | |
| 106 | |
| 107 // Convert an offset from an Elf header into a pointer to the mapped | |
| 108 // address in the current process. Takes an extra template parameter | |
| 109 // to specify the return type to avoid having to dynamic_cast the | |
| 110 // result. | |
| 111 template<typename ElfClass, typename T> | |
| 112 const T* | |
| 113 GetOffset(const typename ElfClass::Ehdr* elf_header, | |
| 114 typename ElfClass::Off offset); | |
| 115 | |
| 116 } // namespace google_breakpad | |
| 117 | |
| 118 #endif // COMMON_LINUX_ELFUTILS_H__ |
