1 //===-- ObjectFileELF.h --------------------------------------- -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef liblldb_ObjectFileELF_h_
11 #define liblldb_ObjectFileELF_h_
20 // Other libraries and framework includes
22 #include "lldb/Core/ArchSpec.h"
23 #include "lldb/Core/UUID.h"
24 #include "lldb/Host/FileSpec.h"
25 #include "lldb/Symbol/ObjectFile.h"
26 #include "lldb/lldb-private.h"
28 #include "ELFHeader.h"
31 elf::elf_word n_namesz;
32 elf::elf_word n_descsz;
37 ELFNote() : n_namesz(0), n_descsz(0), n_type(0) {}
39 /// Parse an ELFNote entry from the given DataExtractor starting at position
43 /// The DataExtractor to read from.
45 /// @param[in,out] offset
46 /// Pointer to an offset in the data. On return the offset will be
47 /// advanced by the number of bytes read.
50 /// True if the ELFRel entry was successfully read and false otherwise.
51 bool Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset);
53 size_t GetByteSize() const {
54 return 12 + llvm::alignTo(n_namesz, 4) + llvm::alignTo(n_descsz, 4);
58 //------------------------------------------------------------------------------
59 /// @class ObjectFileELF
60 /// @brief Generic ELF object file reader.
62 /// This class provides a generic ELF (32/64 bit) reader plugin implementing the
63 /// ObjectFile protocol.
64 class ObjectFileELF : public lldb_private::ObjectFile {
66 ~ObjectFileELF() override;
68 //------------------------------------------------------------------
70 //------------------------------------------------------------------
71 static void Initialize();
73 static void Terminate();
75 static lldb_private::ConstString GetPluginNameStatic();
77 static const char *GetPluginDescriptionStatic();
79 static lldb_private::ObjectFile *
80 CreateInstance(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
81 lldb::offset_t data_offset, const lldb_private::FileSpec *file,
82 lldb::offset_t file_offset, lldb::offset_t length);
84 static lldb_private::ObjectFile *CreateMemoryInstance(
85 const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
86 const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
88 static size_t GetModuleSpecifications(const lldb_private::FileSpec &file,
89 lldb::DataBufferSP &data_sp,
90 lldb::offset_t data_offset,
91 lldb::offset_t file_offset,
92 lldb::offset_t length,
93 lldb_private::ModuleSpecList &specs);
95 static bool MagicBytesMatch(lldb::DataBufferSP &data_sp, lldb::addr_t offset,
98 //------------------------------------------------------------------
99 // PluginInterface protocol
100 //------------------------------------------------------------------
101 lldb_private::ConstString GetPluginName() override;
103 uint32_t GetPluginVersion() override;
105 //------------------------------------------------------------------
106 // ObjectFile Protocol.
107 //------------------------------------------------------------------
108 bool ParseHeader() override;
110 bool SetLoadAddress(lldb_private::Target &target, lldb::addr_t value,
111 bool value_is_offset) override;
113 lldb::ByteOrder GetByteOrder() const override;
115 bool IsExecutable() const override;
117 uint32_t GetAddressByteSize() const override;
119 lldb::AddressClass GetAddressClass(lldb::addr_t file_addr) override;
121 lldb_private::Symtab *GetSymtab() override;
123 bool IsStripped() override;
125 void CreateSections(lldb_private::SectionList &unified_section_list) override;
127 void Dump(lldb_private::Stream *s) override;
129 bool GetArchitecture(lldb_private::ArchSpec &arch) override;
131 bool GetUUID(lldb_private::UUID *uuid) override;
133 lldb_private::FileSpecList GetDebugSymbolFilePaths() override;
135 uint32_t GetDependentModules(lldb_private::FileSpecList &files) override;
137 lldb_private::Address
138 GetImageInfoAddress(lldb_private::Target *target) override;
140 lldb_private::Address GetEntryPointAddress() override;
142 ObjectFile::Type CalculateType() override;
144 ObjectFile::Strata CalculateStrata() override;
146 // Returns number of program headers found in the ELF file.
147 size_t GetProgramHeaderCount();
149 // Returns the program header with the given index.
150 const elf::ELFProgramHeader *GetProgramHeaderByIndex(lldb::user_id_t id);
152 // Returns segment data for the given index.
153 lldb_private::DataExtractor GetSegmentDataByIndex(lldb::user_id_t id);
156 StripLinkerSymbolAnnotations(llvm::StringRef symbol_name) const override;
159 ObjectFileELF(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
160 lldb::offset_t data_offset, const lldb_private::FileSpec *file,
161 lldb::offset_t offset, lldb::offset_t length);
163 ObjectFileELF(const lldb::ModuleSP &module_sp,
164 lldb::DataBufferSP &header_data_sp,
165 const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
167 typedef std::vector<elf::ELFProgramHeader> ProgramHeaderColl;
168 typedef ProgramHeaderColl::iterator ProgramHeaderCollIter;
169 typedef ProgramHeaderColl::const_iterator ProgramHeaderCollConstIter;
171 struct ELFSectionHeaderInfo : public elf::ELFSectionHeader {
172 lldb_private::ConstString section_name;
175 typedef std::vector<ELFSectionHeaderInfo> SectionHeaderColl;
176 typedef SectionHeaderColl::iterator SectionHeaderCollIter;
177 typedef SectionHeaderColl::const_iterator SectionHeaderCollConstIter;
179 typedef std::vector<elf::ELFDynamic> DynamicSymbolColl;
180 typedef DynamicSymbolColl::iterator DynamicSymbolCollIter;
181 typedef DynamicSymbolColl::const_iterator DynamicSymbolCollConstIter;
183 typedef std::map<lldb::addr_t, lldb::AddressClass>
184 FileAddressToAddressClassMap;
185 typedef std::function<lldb::offset_t(lldb_private::DataExtractor &,
186 lldb::offset_t, lldb::offset_t)>
189 /// Version of this reader common to all plugins based on this class.
190 static const uint32_t m_plugin_version = 1;
191 static const uint32_t g_core_uuid_magic;
194 elf::ELFHeader m_header;
197 lldb_private::UUID m_uuid;
199 /// ELF .gnu_debuglink file and crc data if available.
200 std::string m_gnu_debuglink_file;
201 uint32_t m_gnu_debuglink_crc;
203 /// Collection of program headers.
204 ProgramHeaderColl m_program_headers;
206 /// Collection of section headers.
207 SectionHeaderColl m_section_headers;
209 /// Collection of symbols from the dynamic table.
210 DynamicSymbolColl m_dynamic_symbols;
212 /// List of file specifications corresponding to the modules (shared
213 /// libraries) on which this object file depends.
214 mutable std::unique_ptr<lldb_private::FileSpecList> m_filespec_ap;
216 /// Cached value of the entry point for this module.
217 lldb_private::Address m_entry_point_address;
219 /// The architecture detected from parsing elf file contents.
220 lldb_private::ArchSpec m_arch_spec;
222 /// The address class for each symbol in the elf file
223 FileAddressToAddressClassMap m_address_class_map;
225 /// Returns a 1 based index of the given section header.
226 size_t SectionIndex(const SectionHeaderCollIter &I);
228 /// Returns a 1 based index of the given section header.
229 size_t SectionIndex(const SectionHeaderCollConstIter &I) const;
231 // Parses the ELF program headers.
232 static size_t GetProgramHeaderInfo(ProgramHeaderColl &program_headers,
233 const SetDataFunction &set_data,
234 const elf::ELFHeader &header);
236 // Finds PT_NOTE segments and calculates their crc sum.
238 CalculateELFNotesSegmentsCRC32(const ProgramHeaderColl &program_headers,
239 lldb_private::DataExtractor &data);
241 /// Parses all section headers present in this object file and populates
242 /// m_program_headers. This method will compute the header list only once.
243 /// Returns the number of headers parsed.
244 size_t ParseProgramHeaders();
246 /// Parses all section headers present in this object file and populates
247 /// m_section_headers. This method will compute the header list only once.
248 /// Returns the number of headers parsed.
249 size_t ParseSectionHeaders();
251 static void ParseARMAttributes(lldb_private::DataExtractor &data,
253 lldb_private::ArchSpec &arch_spec);
255 /// Parses the elf section headers and returns the uuid, debug link name, crc,
257 static size_t GetSectionHeaderInfo(SectionHeaderColl §ion_headers,
258 const SetDataFunction &set_data,
259 const elf::ELFHeader &header,
260 lldb_private::UUID &uuid,
261 std::string &gnu_debuglink_file,
262 uint32_t &gnu_debuglink_crc,
263 lldb_private::ArchSpec &arch_spec);
265 /// Scans the dynamic section and locates all dependent modules (shared
266 /// libraries) populating m_filespec_ap. This method will compute the
267 /// dependent module list only once. Returns the number of dependent
269 size_t ParseDependentModules();
271 /// Parses the dynamic symbol table and populates m_dynamic_symbols. The
272 /// vector retains the order as found in the object file. Returns the
273 /// number of dynamic symbols parsed.
274 size_t ParseDynamicSymbols();
276 /// Populates m_symtab_ap will all non-dynamic linker symbols. This method
277 /// will parse the symbols only once. Returns the number of symbols parsed.
278 unsigned ParseSymbolTable(lldb_private::Symtab *symbol_table,
279 lldb::user_id_t start_id,
280 lldb_private::Section *symtab);
282 /// Helper routine for ParseSymbolTable().
283 unsigned ParseSymbols(lldb_private::Symtab *symbol_table,
284 lldb::user_id_t start_id,
285 lldb_private::SectionList *section_list,
286 const size_t num_symbols,
287 const lldb_private::DataExtractor &symtab_data,
288 const lldb_private::DataExtractor &strtab_data);
290 /// Scans the relocation entries and adds a set of artificial symbols to the
291 /// given symbol table for each PLT slot. Returns the number of symbols
293 unsigned ParseTrampolineSymbols(lldb_private::Symtab *symbol_table,
294 lldb::user_id_t start_id,
295 const ELFSectionHeaderInfo *rela_hdr,
296 lldb::user_id_t section_id);
298 void ParseUnwindSymbols(lldb_private::Symtab *symbol_table,
299 lldb_private::DWARFCallFrameInfo *eh_frame);
301 /// Relocates debug sections
302 unsigned RelocateDebugSections(const elf::ELFSectionHeader *rel_hdr,
303 lldb::user_id_t rel_id);
305 unsigned RelocateSection(lldb_private::Symtab *symtab,
306 const elf::ELFHeader *hdr,
307 const elf::ELFSectionHeader *rel_hdr,
308 const elf::ELFSectionHeader *symtab_hdr,
309 const elf::ELFSectionHeader *debug_hdr,
310 lldb_private::DataExtractor &rel_data,
311 lldb_private::DataExtractor &symtab_data,
312 lldb_private::DataExtractor &debug_data,
313 lldb_private::Section *rel_section);
315 /// Loads the section name string table into m_shstr_data. Returns the
316 /// number of bytes constituting the table.
317 size_t GetSectionHeaderStringTable();
319 /// Utility method for looking up a section given its name. Returns the
320 /// index of the corresponding section or zero if no section with the given
321 /// name can be found (note that section indices are always 1 based, and so
322 /// section index 0 is never valid).
323 lldb::user_id_t GetSectionIndexByName(const char *name);
325 // Returns the ID of the first section that has the given type.
326 lldb::user_id_t GetSectionIndexByType(unsigned type);
328 /// Returns the section header with the given id or NULL.
329 const ELFSectionHeaderInfo *GetSectionHeaderByIndex(lldb::user_id_t id);
331 /// @name ELF header dump routines
333 static void DumpELFHeader(lldb_private::Stream *s,
334 const elf::ELFHeader &header);
336 static void DumpELFHeader_e_ident_EI_DATA(lldb_private::Stream *s,
337 unsigned char ei_data);
339 static void DumpELFHeader_e_type(lldb_private::Stream *s,
340 elf::elf_half e_type);
343 /// @name ELF program header dump routines
345 void DumpELFProgramHeaders(lldb_private::Stream *s);
347 static void DumpELFProgramHeader(lldb_private::Stream *s,
348 const elf::ELFProgramHeader &ph);
350 static void DumpELFProgramHeader_p_type(lldb_private::Stream *s,
351 elf::elf_word p_type);
353 static void DumpELFProgramHeader_p_flags(lldb_private::Stream *s,
354 elf::elf_word p_flags);
357 /// @name ELF section header dump routines
359 void DumpELFSectionHeaders(lldb_private::Stream *s);
361 static void DumpELFSectionHeader(lldb_private::Stream *s,
362 const ELFSectionHeaderInfo &sh);
364 static void DumpELFSectionHeader_sh_type(lldb_private::Stream *s,
365 elf::elf_word sh_type);
367 static void DumpELFSectionHeader_sh_flags(lldb_private::Stream *s,
368 elf::elf_xword sh_flags);
371 /// ELF dependent module dump routine.
372 void DumpDependentModules(lldb_private::Stream *s);
374 const elf::ELFDynamic *FindDynamicSymbol(unsigned tag);
376 unsigned PLTRelocationType();
378 static lldb_private::Error
379 RefineModuleDetailsFromNote(lldb_private::DataExtractor &data,
380 lldb_private::ArchSpec &arch_spec,
381 lldb_private::UUID &uuid);
383 static lldb::offset_t SetData(const lldb_private::DataExtractor &src,
384 lldb_private::DataExtractor &dst,
385 lldb::offset_t offset, lldb::offset_t length);
387 lldb::offset_t SetDataWithReadMemoryFallback(lldb_private::DataExtractor &dst,
388 lldb::offset_t offset,
389 lldb::offset_t length);
392 #endif // liblldb_ObjectFileELF_h_