| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef SIMPLE_PERF_READ_ELF_H_ |
| #define SIMPLE_PERF_READ_ELF_H_ |
| |
| #include <functional> |
| #include <ostream> |
| #include <string> |
| #include "build_id.h" |
| |
| // Read ELF functions are called in different situations, so it is hard to |
| // decide whether to report error or not. So read ELF functions don't report |
| // error when something wrong happens, instead they return ElfStatus, which |
| // identifies different errors met while reading elf file. |
| enum ElfStatus { |
| NO_ERROR, |
| FILE_NOT_FOUND, |
| READ_FAILED, |
| FILE_MALFORMED, |
| NO_SYMBOL_TABLE, |
| NO_BUILD_ID, |
| BUILD_ID_MISMATCH, |
| SECTION_NOT_FOUND, |
| }; |
| |
| std::ostream& operator<<(std::ostream& os, const ElfStatus& status); |
| |
| ElfStatus GetBuildIdFromNoteFile(const std::string& filename, BuildId* build_id); |
| ElfStatus GetBuildIdFromElfFile(const std::string& filename, BuildId* build_id); |
| ElfStatus GetBuildIdFromEmbeddedElfFile(const std::string& filename, uint64_t file_offset, |
| uint32_t file_size, BuildId* build_id); |
| |
| // The symbol prefix used to indicate that the symbol belongs to android linker. |
| static const std::string linker_prefix = "__dl_"; |
| |
| struct ElfFileSymbol { |
| uint64_t vaddr; |
| uint64_t len; |
| bool is_func; |
| bool is_label; |
| bool is_in_text_section; |
| std::string name; |
| |
| ElfFileSymbol() : vaddr(0), len(0), is_func(false), is_label(false), is_in_text_section(false) { |
| } |
| }; |
| |
| ElfStatus ParseSymbolsFromElfFile(const std::string& filename, |
| const BuildId& expected_build_id, |
| const std::function<void(const ElfFileSymbol&)>& callback); |
| ElfStatus ParseSymbolsFromEmbeddedElfFile(const std::string& filename, uint64_t file_offset, |
| uint32_t file_size, const BuildId& expected_build_id, |
| const std::function<void(const ElfFileSymbol&)>& callback); |
| |
| ElfStatus ReadMinExecutableVirtualAddressFromElfFile(const std::string& filename, |
| const BuildId& expected_build_id, |
| uint64_t* min_addr); |
| |
| ElfStatus ReadSectionFromElfFile(const std::string& filename, const std::string& section_name, |
| std::string* content); |
| |
| // Expose the following functions for unit tests. |
| bool IsArmMappingSymbol(const char* name); |
| ElfStatus IsValidElfFile(int fd); |
| ElfStatus IsValidElfPath(const std::string& filename); |
| bool GetBuildIdFromNoteSection(const char* section, size_t section_size, BuildId* build_id); |
| |
| #endif // SIMPLE_PERF_READ_ELF_H_ |