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