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118 lines
3.6 KiB
118 lines
3.6 KiB
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SIMPLE_PERF_READ_ELF_H_
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#define SIMPLE_PERF_READ_ELF_H_
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#include <functional>
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#include <ostream>
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#include <string>
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#include "build_id.h"
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namespace llvm {
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class MemoryBuffer;
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}
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namespace simpleperf {
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// Read ELF functions are called in different situations, so it is hard to
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// decide whether to report error or not. So read ELF functions don't report
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// error when something wrong happens, instead they return ElfStatus, which
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// identifies different errors met while reading elf file.
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enum class ElfStatus {
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NO_ERROR,
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FILE_NOT_FOUND,
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READ_FAILED,
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FILE_MALFORMED,
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NO_SYMBOL_TABLE,
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NO_BUILD_ID,
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BUILD_ID_MISMATCH,
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SECTION_NOT_FOUND,
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};
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std::ostream& operator<<(std::ostream& os, const ElfStatus& status);
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ElfStatus GetBuildIdFromNoteFile(const std::string& filename, BuildId* build_id);
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// The symbol prefix used to indicate that the symbol belongs to android linker.
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static const std::string linker_prefix = "__dl_";
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struct ElfFileSymbol {
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uint64_t vaddr;
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uint64_t len;
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bool is_func;
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bool is_label;
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bool is_in_text_section;
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std::string name;
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ElfFileSymbol() : vaddr(0), len(0), is_func(false), is_label(false), is_in_text_section(false) {}
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};
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struct ElfSegment {
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uint64_t vaddr = 0;
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uint64_t file_offset = 0;
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uint64_t file_size = 0;
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bool is_executable = false;
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bool is_load = false;
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};
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struct ElfSection {
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std::string name;
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uint64_t vaddr = 0;
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uint64_t file_offset = 0;
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uint64_t size = 0;
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};
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class ElfFile {
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public:
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// Report error instead of returning status.
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static std::unique_ptr<ElfFile> Open(const std::string& filename);
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static std::unique_ptr<ElfFile> Open(const std::string& filename, ElfStatus* status) {
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return Open(filename, nullptr, status);
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}
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static std::unique_ptr<ElfFile> Open(const std::string& filename,
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const BuildId* expected_build_id, ElfStatus* status);
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static std::unique_ptr<ElfFile> Open(const char* data, size_t size, ElfStatus* status);
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virtual ~ElfFile() {}
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virtual bool Is64Bit() = 0;
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virtual llvm::MemoryBuffer* GetMemoryBuffer() = 0;
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virtual std::vector<ElfSegment> GetProgramHeader() = 0;
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virtual std::vector<ElfSection> GetSectionHeader() = 0;
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virtual ElfStatus GetBuildId(BuildId* build_id) = 0;
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using ParseSymbolCallback = std::function<void(const ElfFileSymbol&)>;
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virtual ElfStatus ParseSymbols(const ParseSymbolCallback& callback) = 0;
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virtual void ParseDynamicSymbols(const ParseSymbolCallback& callback) = 0;
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virtual ElfStatus ReadSection(const std::string& section_name, std::string* content) = 0;
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virtual uint64_t ReadMinExecutableVaddr(uint64_t* file_offset_of_min_vaddr) = 0;
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virtual bool VaddrToOff(uint64_t vaddr, uint64_t* file_offset) = 0;
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protected:
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ElfFile() {}
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};
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bool IsArmMappingSymbol(const char* name);
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ElfStatus IsValidElfFile(int fd, uint64_t file_offset = 0);
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bool IsValidElfFileMagic(const char* buf, size_t buf_size);
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bool GetBuildIdFromNoteSection(const char* section, size_t section_size, BuildId* build_id);
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} // namespace simpleperf
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#endif // SIMPLE_PERF_READ_ELF_H_
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