fbd703add5
This allows us to fixup the address of the symbol as soon as we parse it so that lldb is not confused thinking there are two different symbols in the binary (one with the thumb bit, one without). Also, differentiating between THUMB and ARM symbols allows the debugger to place the right type of breakpoint. Change by Stephane Sezer. llvm-svn: 217841
424 lines
14 KiB
C++
424 lines
14 KiB
C++
//===-- ObjectFileELF.h --------------------------------------- -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef liblldb_ObjectFileELF_h_
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#define liblldb_ObjectFileELF_h_
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#include <stdint.h>
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#include <vector>
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#include "lldb/lldb-private.h"
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#include "lldb/Host/FileSpec.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Core/UUID.h"
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#include "lldb/Core/ArchSpec.h"
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#include "ELFHeader.h"
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struct ELFNote
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{
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elf::elf_word n_namesz;
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elf::elf_word n_descsz;
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elf::elf_word n_type;
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std::string n_name;
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ELFNote() : n_namesz(0), n_descsz(0), n_type(0)
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{
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}
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/// Parse an ELFNote entry from the given DataExtractor starting at position
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/// \p offset.
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///
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/// @param[in] data
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/// The DataExtractor to read from.
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///
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/// @param[in,out] offset
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/// Pointer to an offset in the data. On return the offset will be
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/// advanced by the number of bytes read.
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///
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/// @return
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/// True if the ELFRel entry was successfully read and false otherwise.
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bool
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Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset);
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};
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//------------------------------------------------------------------------------
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/// @class ObjectFileELF
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/// @brief Generic ELF object file reader.
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///
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/// This class provides a generic ELF (32/64 bit) reader plugin implementing the
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/// ObjectFile protocol.
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class ObjectFileELF :
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public lldb_private::ObjectFile
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{
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public:
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//------------------------------------------------------------------
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// Static Functions
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//------------------------------------------------------------------
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static void
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Initialize();
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static void
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Terminate();
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static lldb_private::ConstString
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GetPluginNameStatic();
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static const char *
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GetPluginDescriptionStatic();
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static lldb_private::ObjectFile *
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CreateInstance(const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& data_sp,
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lldb::offset_t data_offset,
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const lldb_private::FileSpec* file,
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lldb::offset_t file_offset,
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lldb::offset_t length);
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static lldb_private::ObjectFile *
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CreateMemoryInstance (const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& data_sp,
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const lldb::ProcessSP &process_sp,
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lldb::addr_t header_addr);
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static size_t
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GetModuleSpecifications (const lldb_private::FileSpec& file,
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lldb::DataBufferSP& data_sp,
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lldb::offset_t data_offset,
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lldb::offset_t file_offset,
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lldb::offset_t length,
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lldb_private::ModuleSpecList &specs);
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static bool
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MagicBytesMatch (lldb::DataBufferSP& data_sp,
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lldb::addr_t offset,
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lldb::addr_t length);
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//------------------------------------------------------------------
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// PluginInterface protocol
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//------------------------------------------------------------------
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virtual lldb_private::ConstString
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GetPluginName();
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virtual uint32_t
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GetPluginVersion();
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//------------------------------------------------------------------
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// ObjectFile Protocol.
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//------------------------------------------------------------------
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virtual
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~ObjectFileELF();
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virtual bool
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ParseHeader();
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virtual bool
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SetLoadAddress (lldb_private::Target &target,
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lldb::addr_t value,
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bool value_is_offset);
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virtual lldb::ByteOrder
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GetByteOrder() const;
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virtual bool
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IsExecutable () const;
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virtual uint32_t
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GetAddressByteSize() const;
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virtual lldb::AddressClass
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GetAddressClass (lldb::addr_t file_addr);
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virtual lldb_private::Symtab *
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GetSymtab();
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virtual lldb_private::Symbol *
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ResolveSymbolForAddress(const lldb_private::Address& so_addr, bool verify_unique);
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virtual bool
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IsStripped ();
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virtual void
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CreateSections (lldb_private::SectionList &unified_section_list);
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virtual void
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Dump(lldb_private::Stream *s);
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virtual bool
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GetArchitecture (lldb_private::ArchSpec &arch);
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virtual bool
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GetUUID(lldb_private::UUID* uuid);
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virtual lldb_private::FileSpecList
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GetDebugSymbolFilePaths();
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virtual uint32_t
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GetDependentModules(lldb_private::FileSpecList& files);
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virtual lldb_private::Address
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GetImageInfoAddress(lldb_private::Target *target);
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virtual lldb_private::Address
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GetEntryPointAddress ();
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virtual ObjectFile::Type
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CalculateType();
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virtual ObjectFile::Strata
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CalculateStrata();
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// Returns number of program headers found in the ELF file.
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size_t
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GetProgramHeaderCount();
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// Returns the program header with the given index.
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const elf::ELFProgramHeader *
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GetProgramHeaderByIndex(lldb::user_id_t id);
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// Returns segment data for the given index.
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lldb_private::DataExtractor
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GetSegmentDataByIndex(lldb::user_id_t id);
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private:
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ObjectFileELF(const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& data_sp,
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lldb::offset_t data_offset,
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const lldb_private::FileSpec* file,
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lldb::offset_t offset,
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lldb::offset_t length);
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ObjectFileELF (const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& data_sp,
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const lldb::ProcessSP &process_sp,
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lldb::addr_t header_addr);
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typedef std::vector<elf::ELFProgramHeader> ProgramHeaderColl;
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typedef ProgramHeaderColl::iterator ProgramHeaderCollIter;
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typedef ProgramHeaderColl::const_iterator ProgramHeaderCollConstIter;
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struct ELFSectionHeaderInfo : public elf::ELFSectionHeader
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{
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lldb_private::ConstString section_name;
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};
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typedef std::vector<ELFSectionHeaderInfo> SectionHeaderColl;
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typedef SectionHeaderColl::iterator SectionHeaderCollIter;
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typedef SectionHeaderColl::const_iterator SectionHeaderCollConstIter;
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typedef std::vector<elf::ELFDynamic> DynamicSymbolColl;
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typedef DynamicSymbolColl::iterator DynamicSymbolCollIter;
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typedef DynamicSymbolColl::const_iterator DynamicSymbolCollConstIter;
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/// Version of this reader common to all plugins based on this class.
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static const uint32_t m_plugin_version = 1;
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static const uint32_t g_core_uuid_magic;
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/// ELF file header.
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elf::ELFHeader m_header;
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/// ELF build ID.
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lldb_private::UUID m_uuid;
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/// ELF .gnu_debuglink file and crc data if available.
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std::string m_gnu_debuglink_file;
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uint32_t m_gnu_debuglink_crc;
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/// Collection of program headers.
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ProgramHeaderColl m_program_headers;
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/// Collection of section headers.
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SectionHeaderColl m_section_headers;
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/// Collection of symbols from the dynamic table.
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DynamicSymbolColl m_dynamic_symbols;
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/// List of file specifications corresponding to the modules (shared
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/// libraries) on which this object file depends.
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mutable std::unique_ptr<lldb_private::FileSpecList> m_filespec_ap;
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/// Cached value of the entry point for this module.
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lldb_private::Address m_entry_point_address;
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/// The architecture detected from parsing elf file contents.
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lldb_private::ArchSpec m_arch_spec;
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/// Returns a 1 based index of the given section header.
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size_t
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SectionIndex(const SectionHeaderCollIter &I);
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/// Returns a 1 based index of the given section header.
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size_t
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SectionIndex(const SectionHeaderCollConstIter &I) const;
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// Parses the ELF program headers.
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static size_t
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GetProgramHeaderInfo(ProgramHeaderColl &program_headers,
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lldb_private::DataExtractor &data,
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const elf::ELFHeader &header);
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// Finds PT_NOTE segments and calculates their crc sum.
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static uint32_t
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CalculateELFNotesSegmentsCRC32(const ProgramHeaderColl& program_headers,
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lldb_private::DataExtractor &data);
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/// Parses all section headers present in this object file and populates
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/// m_program_headers. This method will compute the header list only once.
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/// Returns the number of headers parsed.
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size_t
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ParseProgramHeaders();
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/// Parses all section headers present in this object file and populates
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/// m_section_headers. This method will compute the header list only once.
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/// Returns the number of headers parsed.
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size_t
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ParseSectionHeaders();
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/// Parses the elf section headers and returns the uuid, debug link name, crc, archspec.
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static size_t
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GetSectionHeaderInfo(SectionHeaderColl §ion_headers,
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lldb_private::DataExtractor &data,
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const elf::ELFHeader &header,
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lldb_private::UUID &uuid,
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std::string &gnu_debuglink_file,
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uint32_t &gnu_debuglink_crc,
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lldb_private::ArchSpec &arch_spec);
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/// Scans the dynamic section and locates all dependent modules (shared
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/// libraries) populating m_filespec_ap. This method will compute the
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/// dependent module list only once. Returns the number of dependent
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/// modules parsed.
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size_t
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ParseDependentModules();
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/// Parses the dynamic symbol table and populates m_dynamic_symbols. The
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/// vector retains the order as found in the object file. Returns the
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/// number of dynamic symbols parsed.
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size_t
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ParseDynamicSymbols();
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/// Populates m_symtab_ap will all non-dynamic linker symbols. This method
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/// will parse the symbols only once. Returns the number of symbols parsed.
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unsigned
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ParseSymbolTable(lldb_private::Symtab *symbol_table,
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lldb::user_id_t start_id,
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lldb_private::Section *symtab);
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/// Helper routine for ParseSymbolTable().
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unsigned
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ParseSymbols(lldb_private::Symtab *symbol_table,
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lldb::user_id_t start_id,
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lldb_private::SectionList *section_list,
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const size_t num_symbols,
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const lldb_private::DataExtractor &symtab_data,
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const lldb_private::DataExtractor &strtab_data);
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/// Scans the relocation entries and adds a set of artificial symbols to the
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/// given symbol table for each PLT slot. Returns the number of symbols
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/// added.
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unsigned
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ParseTrampolineSymbols(lldb_private::Symtab *symbol_table,
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lldb::user_id_t start_id,
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const ELFSectionHeaderInfo *rela_hdr,
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lldb::user_id_t section_id);
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/// Relocates debug sections
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unsigned
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RelocateDebugSections(const elf::ELFSectionHeader *rel_hdr, lldb::user_id_t rel_id);
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unsigned
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RelocateSection(lldb_private::Symtab* symtab, const elf::ELFHeader *hdr, const elf::ELFSectionHeader *rel_hdr,
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const elf::ELFSectionHeader *symtab_hdr, const elf::ELFSectionHeader *debug_hdr,
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lldb_private::DataExtractor &rel_data, lldb_private::DataExtractor &symtab_data,
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lldb_private::DataExtractor &debug_data, lldb_private::Section* rel_section);
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/// Loads the section name string table into m_shstr_data. Returns the
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/// number of bytes constituting the table.
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size_t
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GetSectionHeaderStringTable();
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/// Utility method for looking up a section given its name. Returns the
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/// index of the corresponding section or zero if no section with the given
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/// name can be found (note that section indices are always 1 based, and so
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/// section index 0 is never valid).
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lldb::user_id_t
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GetSectionIndexByName(const char *name);
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// Returns the ID of the first section that has the given type.
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lldb::user_id_t
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GetSectionIndexByType(unsigned type);
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/// Returns the section header with the given id or NULL.
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const ELFSectionHeaderInfo *
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GetSectionHeaderByIndex(lldb::user_id_t id);
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/// @name ELF header dump routines
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//@{
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static void
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DumpELFHeader(lldb_private::Stream *s, const elf::ELFHeader& header);
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static void
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DumpELFHeader_e_ident_EI_DATA(lldb_private::Stream *s,
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unsigned char ei_data);
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static void
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DumpELFHeader_e_type(lldb_private::Stream *s, elf::elf_half e_type);
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//@}
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/// @name ELF program header dump routines
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//@{
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void
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DumpELFProgramHeaders(lldb_private::Stream *s);
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static void
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DumpELFProgramHeader(lldb_private::Stream *s,
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const elf::ELFProgramHeader &ph);
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static void
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DumpELFProgramHeader_p_type(lldb_private::Stream *s, elf::elf_word p_type);
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static void
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DumpELFProgramHeader_p_flags(lldb_private::Stream *s,
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elf::elf_word p_flags);
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//@}
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/// @name ELF section header dump routines
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//@{
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void
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DumpELFSectionHeaders(lldb_private::Stream *s);
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static void
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DumpELFSectionHeader(lldb_private::Stream *s,
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const ELFSectionHeaderInfo& sh);
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static void
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DumpELFSectionHeader_sh_type(lldb_private::Stream *s,
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elf::elf_word sh_type);
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static void
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DumpELFSectionHeader_sh_flags(lldb_private::Stream *s,
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elf::elf_xword sh_flags);
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//@}
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/// ELF dependent module dump routine.
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void
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DumpDependentModules(lldb_private::Stream *s);
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const elf::ELFDynamic *
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FindDynamicSymbol(unsigned tag);
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unsigned
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PLTRelocationType();
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static lldb_private::Error
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RefineModuleDetailsFromNote (lldb_private::DataExtractor &data, lldb_private::ArchSpec &arch_spec, lldb_private::UUID &uuid);
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};
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#endif // #ifndef liblldb_ObjectFileELF_h_
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