| // Copyright (c) 2012, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| // |
| // elfutils.h: Utilities for dealing with ELF files. |
| // |
| |
| #ifndef COMMON_LINUX_ELFUTILS_H_ |
| #define COMMON_LINUX_ELFUTILS_H_ |
| |
| #include <elf.h> |
| #include <link.h> |
| #include <stdint.h> |
| |
| namespace google_breakpad { |
| |
| // Traits classes so consumers can write templatized code to deal |
| // with specific ELF bits. |
| struct ElfClass32 { |
| typedef Elf32_Addr Addr; |
| typedef Elf32_Ehdr Ehdr; |
| typedef Elf32_Nhdr Nhdr; |
| typedef Elf32_Phdr Phdr; |
| typedef Elf32_Shdr Shdr; |
| typedef Elf32_Half Half; |
| typedef Elf32_Off Off; |
| typedef Elf32_Word Word; |
| static const int kClass = ELFCLASS32; |
| static const size_t kAddrSize = sizeof(Elf32_Addr); |
| }; |
| |
| struct ElfClass64 { |
| typedef Elf64_Addr Addr; |
| typedef Elf64_Ehdr Ehdr; |
| typedef Elf64_Nhdr Nhdr; |
| typedef Elf64_Phdr Phdr; |
| typedef Elf64_Shdr Shdr; |
| typedef Elf64_Half Half; |
| typedef Elf64_Off Off; |
| typedef Elf64_Word Word; |
| static const int kClass = ELFCLASS64; |
| static const size_t kAddrSize = sizeof(Elf64_Addr); |
| }; |
| |
| bool IsValidElf(const void* elf_header); |
| int ElfClass(const void* elf_base); |
| |
| // Attempt to find a section named |section_name| of type |section_type| |
| // in the ELF binary data at |elf_mapped_base|. On success, returns true |
| // and sets |*section_start| to point to the start of the section data, |
| // and |*section_size| to the size of the section's data. If |elfclass| |
| // is not NULL, set |*elfclass| to the ELF file class. |
| bool FindElfSection(const void *elf_mapped_base, |
| const char *section_name, |
| uint32_t section_type, |
| const void **section_start, |
| size_t *section_size, |
| int *elfclass); |
| |
| // Internal helper method, exposed for convenience for callers |
| // that already have more info. |
| template<typename ElfClass> |
| const typename ElfClass::Shdr* |
| FindElfSectionByName(const char* name, |
| typename ElfClass::Word section_type, |
| const typename ElfClass::Shdr* sections, |
| const char* section_names, |
| const char* names_end, |
| int nsection); |
| |
| // Attempt to find the first segment of type |segment_type| in the ELF |
| // binary data at |elf_mapped_base|. On success, returns true and sets |
| // |*segment_start| to point to the start of the segment data, and |
| // and |*segment_size| to the size of the segment's data. If |elfclass| |
| // is not NULL, set |*elfclass| to the ELF file class. |
| bool FindElfSegment(const void *elf_mapped_base, |
| uint32_t segment_type, |
| const void **segment_start, |
| size_t *segment_size, |
| int *elfclass); |
| |
| // Convert an offset from an Elf header into a pointer to the mapped |
| // address in the current process. Takes an extra template parameter |
| // to specify the return type to avoid having to dynamic_cast the |
| // result. |
| template<typename ElfClass, typename T> |
| const T* |
| GetOffset(const typename ElfClass::Ehdr* elf_header, |
| typename ElfClass::Off offset); |
| |
| } // namespace google_breakpad |
| |
| #endif // COMMON_LINUX_ELFUTILS_H_ |