xref: /openbsd-src/gnu/llvm/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h (revision f6aab3d83b51b91c24247ad2c2573574de475a82)

//===-- ObjectFilePECOFF.h --------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef LLDB_SOURCE_PLUGINS_OBJECTFILE_PECOFF_OBJECTFILEPECOFF_H
#define LLDB_SOURCE_PLUGINS_OBJECTFILE_PECOFF_OBJECTFILEPECOFF_H

#include <optional>
#include <vector>

#include "lldb/Symbol/ObjectFile.h"
#include "llvm/Object/COFF.h"

class ObjectFilePECOFF : public lldb_private::ObjectFile {
public:
  enum MachineType {
    MachineUnknown = 0x0,
    MachineAm33 = 0x1d3,
    MachineAmd64 = 0x8664,
    MachineArm = 0x1c0,
    MachineArmNt = 0x1c4,
    MachineArm64 = 0xaa64,
    MachineEbc = 0xebc,
    MachineX86 = 0x14c,
    MachineIA64 = 0x200,
    MachineM32R = 0x9041,
    MachineMips16 = 0x266,
    MachineMipsFpu = 0x366,
    MachineMipsFpu16 = 0x466,
    MachinePowerPc = 0x1f0,
    MachinePowerPcfp = 0x1f1,
    MachineR4000 = 0x166,
    MachineSh3 = 0x1a2,
    MachineSh3dsp = 0x1a3,
    MachineSh4 = 0x1a6,
    MachineSh5 = 0x1a8,
    MachineThumb = 0x1c2,
    MachineWcemIpsv2 = 0x169
  };

  ObjectFilePECOFF(const lldb::ModuleSP &module_sp, lldb::DataBufferSP data_sp,
                   lldb::offset_t data_offset,
                   const lldb_private::FileSpec *file,
                   lldb::offset_t file_offset, lldb::offset_t length);

  ObjectFilePECOFF(const lldb::ModuleSP &module_sp,
                   lldb::WritableDataBufferSP header_data_sp,
                   const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);

  ~ObjectFilePECOFF() override;

  // Static Functions
  static void Initialize();

  static void DebuggerInitialize(lldb_private::Debugger &debugger);

  static void Terminate();

  static llvm::StringRef GetPluginNameStatic() { return "pe-coff"; }

  static llvm::StringRef GetPluginDescriptionStatic();

  static ObjectFile *
  CreateInstance(const lldb::ModuleSP &module_sp, lldb::DataBufferSP data_sp,
                 lldb::offset_t data_offset, const lldb_private::FileSpec *file,
                 lldb::offset_t offset, lldb::offset_t length);

  static lldb_private::ObjectFile *CreateMemoryInstance(
      const lldb::ModuleSP &module_sp, lldb::WritableDataBufferSP data_sp,
      const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);

  static size_t GetModuleSpecifications(const lldb_private::FileSpec &file,
                                        lldb::DataBufferSP &data_sp,
                                        lldb::offset_t data_offset,
                                        lldb::offset_t file_offset,
                                        lldb::offset_t length,
                                        lldb_private::ModuleSpecList &specs);

  static bool SaveCore(const lldb::ProcessSP &process_sp,
                       const lldb_private::FileSpec &outfile,
                       lldb::SaveCoreStyle &core_style,
                       lldb_private::Status &error);

  static bool MagicBytesMatch(lldb::DataBufferSP data_sp);

  static lldb::SymbolType MapSymbolType(uint16_t coff_symbol_type);

  // LLVM RTTI support
  static char ID;
  bool isA(const void *ClassID) const override {
    return ClassID == &ID || ObjectFile::isA(ClassID);
  }
  static bool classof(const ObjectFile *obj) { return obj->isA(&ID); }

  bool ParseHeader() override;

  bool SetLoadAddress(lldb_private::Target &target, lldb::addr_t value,
                      bool value_is_offset) override;

  lldb::ByteOrder GetByteOrder() const override;

  bool IsExecutable() const override;

  uint32_t GetAddressByteSize() const override;

  //    virtual lldb_private::AddressClass
  //    GetAddressClass (lldb::addr_t file_addr);

  void ParseSymtab(lldb_private::Symtab &symtab) override;

  bool IsStripped() override;

  void CreateSections(lldb_private::SectionList &unified_section_list) override;

  void Dump(lldb_private::Stream *s) override;

  lldb_private::ArchSpec GetArchitecture() override;

  lldb_private::UUID GetUUID() override;

  /// Return the contents of the .gnu_debuglink section, if the object file
  /// contains it.
  std::optional<lldb_private::FileSpec> GetDebugLink();

  uint32_t GetDependentModules(lldb_private::FileSpecList &files) override;

  lldb_private::Address GetEntryPointAddress() override;

  lldb_private::Address GetBaseAddress() override;

  ObjectFile::Type CalculateType() override;

  ObjectFile::Strata CalculateStrata() override;

  // PluginInterface protocol
  llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }

  bool IsWindowsSubsystem();

  uint32_t GetRVA(const lldb_private::Address &addr) const;
  lldb_private::Address GetAddress(uint32_t rva);
  lldb::addr_t GetFileAddress(uint32_t rva) const;

  lldb_private::DataExtractor ReadImageData(uint32_t offset, size_t size);
  lldb_private::DataExtractor ReadImageDataByRVA(uint32_t rva, size_t size);

  std::unique_ptr<lldb_private::CallFrameInfo> CreateCallFrameInfo() override;

protected:
  bool NeedsEndianSwap() const;

  typedef struct dos_header { // DOS .EXE header
    uint16_t e_magic = 0;     // Magic number
    uint16_t e_cblp = 0;      // Bytes on last page of file
    uint16_t e_cp = 0;        // Pages in file
    uint16_t e_crlc = 0;      // Relocations
    uint16_t e_cparhdr = 0;   // Size of header in paragraphs
    uint16_t e_minalloc = 0;  // Minimum extra paragraphs needed
    uint16_t e_maxalloc = 0;  // Maximum extra paragraphs needed
    uint16_t e_ss = 0;        // Initial (relative) SS value
    uint16_t e_sp = 0;        // Initial SP value
    uint16_t e_csum = 0;      // Checksum
    uint16_t e_ip = 0;        // Initial IP value
    uint16_t e_cs = 0;        // Initial (relative) CS value
    uint16_t e_lfarlc = 0;    // File address of relocation table
    uint16_t e_ovno = 0;      // Overlay number
    uint16_t e_res[4];        // Reserved words
    uint16_t e_oemid = 0;     // OEM identifier (for e_oeminfo)
    uint16_t e_oeminfo = 0;   // OEM information; e_oemid specific
    uint16_t e_res2[10] = {}; // Reserved words
    uint32_t e_lfanew = 0;    // File address of new exe header
  } dos_header_t;

  typedef struct coff_header {
    uint16_t machine = 0;
    uint16_t nsects = 0;
    uint32_t modtime = 0;
    uint32_t symoff = 0;
    uint32_t nsyms = 0;
    uint16_t hdrsize = 0;
    uint16_t flags = 0;
  } coff_header_t;

  typedef struct data_directory {
    uint32_t vmaddr = 0;
    uint32_t vmsize = 0;
  } data_directory_t;

  typedef struct coff_opt_header {
    uint16_t magic = 0;
    uint8_t major_linker_version = 0;
    uint8_t minor_linker_version = 0;
    uint32_t code_size = 0;
    uint32_t data_size = 0;
    uint32_t bss_size = 0;
    uint32_t entry = 0;
    uint32_t code_offset = 0;
    uint32_t data_offset = 0;

    uint64_t image_base = 0;
    uint32_t sect_alignment = 0;
    uint32_t file_alignment = 0;
    uint16_t major_os_system_version = 0;
    uint16_t minor_os_system_version = 0;
    uint16_t major_image_version = 0;
    uint16_t minor_image_version = 0;
    uint16_t major_subsystem_version = 0;
    uint16_t minor_subsystem_version = 0;
    uint32_t reserved1 = 0;
    uint32_t image_size = 0;
    uint32_t header_size = 0;
    uint32_t checksum = 0;
    uint16_t subsystem = 0;
    uint16_t dll_flags = 0;
    uint64_t stack_reserve_size = 0;
    uint64_t stack_commit_size = 0;
    uint64_t heap_reserve_size = 0;
    uint64_t heap_commit_size = 0;
    uint32_t loader_flags = 0;
    //    uint32_t	num_data_dir_entries;
    std::vector<data_directory>
        data_dirs; // will contain num_data_dir_entries entries
  } coff_opt_header_t;

  typedef struct section_header {
    char name[8] = {};
    uint32_t vmsize = 0;  // Virtual Size
    uint32_t vmaddr = 0;  // Virtual Addr
    uint32_t size = 0;    // File size
    uint32_t offset = 0;  // File offset
    uint32_t reloff = 0;  // Offset to relocations
    uint32_t lineoff = 0; // Offset to line table entries
    uint16_t nreloc = 0;  // Number of relocation entries
    uint16_t nline = 0;   // Number of line table entries
    uint32_t flags = 0;
  } section_header_t;

  static bool ParseDOSHeader(lldb_private::DataExtractor &data,
                             dos_header_t &dos_header);
  static bool ParseCOFFHeader(lldb_private::DataExtractor &data,
                              lldb::offset_t *offset_ptr,
                              coff_header_t &coff_header);
  bool ParseCOFFOptionalHeader(lldb::offset_t *offset_ptr);
  bool ParseSectionHeaders(uint32_t offset);

  uint32_t ParseDependentModules();

  static void DumpDOSHeader(lldb_private::Stream *s,
                            const dos_header_t &header);
  static void DumpCOFFHeader(lldb_private::Stream *s,
                             const coff_header_t &header);
  static void DumpOptCOFFHeader(lldb_private::Stream *s,
                                const coff_opt_header_t &header);
  void DumpSectionHeaders(lldb_private::Stream *s);
  void DumpSectionHeader(lldb_private::Stream *s, const section_header_t &sh);
  void DumpDependentModules(lldb_private::Stream *s);

  llvm::StringRef GetSectionName(const section_header_t &sect);
  static lldb::SectionType GetSectionType(llvm::StringRef sect_name,
                                          const section_header_t &sect);

  typedef std::vector<section_header_t> SectionHeaderColl;
  typedef SectionHeaderColl::iterator SectionHeaderCollIter;
  typedef SectionHeaderColl::const_iterator SectionHeaderCollConstIter;

private:
  bool CreateBinary();
  typedef std::vector<std::pair<uint32_t, uint32_t>> rva_symbol_list_t;
  void AppendFromCOFFSymbolTable(lldb_private::SectionList *sect_list,
                                 lldb_private::Symtab &symtab,
                                 const rva_symbol_list_t &sorted_exports);
  rva_symbol_list_t AppendFromExportTable(lldb_private::SectionList *sect_list,
                                          lldb_private::Symtab &symtab);

  dos_header_t m_dos_header;
  coff_header_t m_coff_header;
  coff_opt_header_t m_coff_header_opt;
  SectionHeaderColl m_sect_headers;
  lldb::addr_t m_image_base;
  lldb_private::Address m_entry_point_address;
  std::optional<lldb_private::FileSpecList> m_deps_filespec;
  std::unique_ptr<llvm::object::COFFObjectFile> m_binary;
  lldb_private::UUID m_uuid;
};

#endif // LLDB_SOURCE_PLUGINS_OBJECTFILE_PECOFF_OBJECTFILEPECOFF_H