234 lines
7.5 KiB
C++
234 lines
7.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// Copyright (c) 2006, 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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// This file is derived from the following files in
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// toolkit/crashreporter/google-breakpad:
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// src/common/android/include/elf.h
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// src/common/linux/elfutils.h
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// src/common/linux/file_id.h
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// src/common/linux/elfutils-inl.h
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#ifndef LulElfInt_h
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#define LulElfInt_h
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// This header defines functions etc internal to the ELF reader. It
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// should not be included outside of LulElf.cpp.
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#include <elf.h>
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#include <stdlib.h>
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#include "mozilla/Assertions.h"
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#include "LulPlatformMacros.h"
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// (derived from)
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// elfutils.h: Utilities for dealing with ELF files.
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//
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#if defined(LUL_OS_android)
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// From toolkit/crashreporter/google-breakpad/src/common/android/include/elf.h
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// The Android headers don't always define this constant.
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#ifndef EM_X86_64
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#define EM_X86_64 62
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#endif
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#ifndef EM_PPC64
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#define EM_PPC64 21
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#endif
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#ifndef EM_S390
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#define EM_S390 22
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#endif
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#ifndef NT_GNU_BUILD_ID
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#define NT_GNU_BUILD_ID 3
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#endif
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#define ElfW(type) _ElfW (Elf, ELFSIZE, type)
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#define _ElfW(e,w,t) _ElfW_1 (e, w, _##t)
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#define _ElfW_1(e,w,t) e##w##t
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//FIXME
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extern "C" {
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extern char* basename(const char* path);
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};
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#else
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# include <link.h>
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#endif
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namespace lul {
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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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// (derived from)
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// file_id.h: Return a unique identifier for a file
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//
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static const size_t kMDGUIDSize = sizeof(MDGUID);
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class FileID {
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public:
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// Load the identifier for the elf file mapped into memory at |base| into
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// |identifier|. Return false if the identifier could not be created for the
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// file.
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static bool ElfFileIdentifierFromMappedFile(const void* base,
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uint8_t identifier[kMDGUIDSize]);
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// Convert the |identifier| data to a NULL terminated string. The string will
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// be formatted as a UUID (e.g., 22F065BB-FC9C-49F7-80FE-26A7CEBD7BCE).
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// The |buffer| should be at least 37 bytes long to receive all of the data
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// and termination. Shorter buffers will contain truncated data.
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static void ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize],
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char* buffer, int buffer_length);
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};
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template<typename ElfClass, typename T>
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const T* GetOffset(const typename ElfClass::Ehdr* elf_header,
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typename ElfClass::Off offset) {
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return reinterpret_cast<const T*>(reinterpret_cast<uintptr_t>(elf_header) +
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offset);
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}
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template<typename ElfClass>
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const typename ElfClass::Shdr* FindElfSectionByName(
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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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MOZ_ASSERT(name != NULL);
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MOZ_ASSERT(sections != NULL);
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MOZ_ASSERT(nsection > 0);
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int name_len = strlen(name);
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if (name_len == 0)
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return NULL;
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for (int i = 0; i < nsection; ++i) {
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const char* section_name = section_names + sections[i].sh_name;
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if (sections[i].sh_type == section_type &&
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names_end - section_name >= name_len + 1 &&
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strcmp(name, section_name) == 0) {
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return sections + i;
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}
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}
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return NULL;
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}
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} // namespace lul
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// And finally, the external interface, offered to LulMain.cpp
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#include "LulElfExt.h"
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#endif // LulElfInt_h
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