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/*
* 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 ParseSymbolsFromElfFileInMemory(const char* data, size_t size,
const std::function<void(const ElfFileSymbol&)>& callback);
ElfStatus ParseDynamicSymbolsFromElfFile(const std::string& filename,
const std::function<void(const ElfFileSymbol&)>& callback);
ElfStatus ReadMinExecutableVirtualAddressFromElfFile(const std::string& filename,
const BuildId& expected_build_id,
uint64_t* min_addr,
uint64_t* file_offset_of_min_vaddr);
ElfStatus ReadMinExecutableVirtualAddressFromEmbeddedElfFile(const std::string& filename,
uint64_t file_offset,
uint32_t file_size,
const BuildId& expected_build_id,
uint64_t* min_vaddr,
uint64_t* file_offset_of_min_vaddr);
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);
bool IsValidElfFileMagic(const char* buf, size_t buf_size);
ElfStatus IsValidElfPath(const std::string& filename);
bool GetBuildIdFromNoteSection(const char* section, size_t section_size, BuildId* build_id);
#endif // SIMPLE_PERF_READ_ELF_H_
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