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 // 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,

                     int *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,

                     int *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__