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