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Diffstat (limited to 'tools/profiler/lul/LulElfInt.h')
| -rw-r--r-- | tools/profiler/lul/LulElfInt.h | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/tools/profiler/lul/LulElfInt.h b/tools/profiler/lul/LulElfInt.h new file mode 100644 index 000000000..899d7d3ee --- /dev/null +++ b/tools/profiler/lul/LulElfInt.h @@ -0,0 +1,234 @@ +/* -*- 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 |