956761adb0
The new DriverKit user-land kernel drivers in macOS 10.15 / Catalina do not have a main() function or an LC_MAIN load command. lldb uses the address of main() as the return address for inferior function calls; it puts a breakpoint on main, runs the inferior function call, and when the main() breakpoint is hit, lldb knows unambiguously that the inferior function call ran to completion - no other function calls main. This change hoists the logic for finding the "entry address" from ThreadPlanCallFunction to Target. It changes the logic to first try to get the entry address from the main executable module, but if that module does not have one, it will iterate through all modules looking for an entry address. The patch also adds code to ObjectFileMachO to use dyld's _dyld_start function as an entry address. <rdar://problem/52343958> Differential Revision: https://reviews.llvm.org/D64897 llvm-svn: 366493
213 lines
8.0 KiB
C++
213 lines
8.0 KiB
C++
//===-- ObjectFileMachO.h ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef liblldb_ObjectFileMachO_h_
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#define liblldb_ObjectFileMachO_h_
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#include "lldb/Core/Address.h"
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#include "lldb/Core/FileSpecList.h"
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#include "lldb/Host/SafeMachO.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/RangeMap.h"
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#include "lldb/Utility/UUID.h"
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// This class needs to be hidden as eventually belongs in a plugin that
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// will export the ObjectFile protocol
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class ObjectFileMachO : public lldb_private::ObjectFile {
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public:
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ObjectFileMachO(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
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lldb::offset_t data_offset,
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const lldb_private::FileSpec *file, lldb::offset_t offset,
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lldb::offset_t length);
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ObjectFileMachO(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
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const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
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~ObjectFileMachO() override = default;
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// Static Functions
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static void Initialize();
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static void Terminate();
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static lldb_private::ConstString GetPluginNameStatic();
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static const char *GetPluginDescriptionStatic();
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static lldb_private::ObjectFile *
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CreateInstance(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
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lldb::offset_t data_offset, const lldb_private::FileSpec *file,
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lldb::offset_t file_offset, lldb::offset_t length);
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static lldb_private::ObjectFile *CreateMemoryInstance(
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const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
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const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
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static size_t 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 SaveCore(const lldb::ProcessSP &process_sp,
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const lldb_private::FileSpec &outfile,
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lldb_private::Status &error);
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static bool MagicBytesMatch(lldb::DataBufferSP &data_sp, lldb::addr_t offset,
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lldb::addr_t length);
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// Member Functions
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bool ParseHeader() override;
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bool SetLoadAddress(lldb_private::Target &target, lldb::addr_t value,
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bool value_is_offset) override;
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lldb::ByteOrder GetByteOrder() const override;
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bool IsExecutable() const override;
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bool IsDynamicLoader() const;
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uint32_t GetAddressByteSize() const override;
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lldb_private::AddressClass GetAddressClass(lldb::addr_t file_addr) override;
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lldb_private::Symtab *GetSymtab() override;
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bool IsStripped() override;
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void CreateSections(lldb_private::SectionList &unified_section_list) override;
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void Dump(lldb_private::Stream *s) override;
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lldb_private::ArchSpec GetArchitecture() override;
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lldb_private::UUID GetUUID() override;
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uint32_t GetDependentModules(lldb_private::FileSpecList &files) override;
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lldb_private::FileSpecList GetReExportedLibraries() override {
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return m_reexported_dylibs;
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}
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lldb_private::Address GetEntryPointAddress() override;
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lldb_private::Address GetBaseAddress() override;
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uint32_t GetNumThreadContexts() override;
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std::string GetIdentifierString() override;
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bool GetCorefileMainBinaryInfo (lldb::addr_t &address, lldb_private::UUID &uuid) override;
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lldb::RegisterContextSP
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GetThreadContextAtIndex(uint32_t idx, lldb_private::Thread &thread) override;
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ObjectFile::Type CalculateType() override;
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ObjectFile::Strata CalculateStrata() override;
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llvm::VersionTuple GetVersion() override;
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llvm::VersionTuple GetMinimumOSVersion() override;
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llvm::VersionTuple GetSDKVersion() override;
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bool GetIsDynamicLinkEditor() override;
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static bool ParseHeader(lldb_private::DataExtractor &data,
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lldb::offset_t *data_offset_ptr,
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llvm::MachO::mach_header &header);
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bool AllowAssemblyEmulationUnwindPlans() override;
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// PluginInterface protocol
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lldb_private::ConstString GetPluginName() override;
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uint32_t GetPluginVersion() override;
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protected:
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static lldb_private::UUID
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GetUUID(const llvm::MachO::mach_header &header,
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const lldb_private::DataExtractor &data,
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lldb::offset_t lc_offset); // Offset to the first load command
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static lldb_private::ArchSpec
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GetArchitecture(const llvm::MachO::mach_header &header,
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const lldb_private::DataExtractor &data,
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lldb::offset_t lc_offset);
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// Intended for same-host arm device debugging where lldb needs to
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// detect libraries in the shared cache and augment the nlist entries
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// with an on-disk dyld_shared_cache file. The process will record
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// the shared cache UUID so the on-disk cache can be matched or rejected
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// correctly.
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void GetProcessSharedCacheUUID(lldb_private::Process *, lldb::addr_t &base_addr, lldb_private::UUID &uuid);
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// Intended for same-host arm device debugging where lldb will read
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// shared cache libraries out of its own memory instead of the remote
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// process' memory as an optimization. If lldb's shared cache UUID
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// does not match the process' shared cache UUID, this optimization
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// should not be used.
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void GetLLDBSharedCacheUUID(lldb::addr_t &base_addir, lldb_private::UUID &uuid);
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lldb_private::Section *GetMachHeaderSection();
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lldb::addr_t CalculateSectionLoadAddressForMemoryImage(
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lldb::addr_t mach_header_load_address,
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const lldb_private::Section *mach_header_section,
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const lldb_private::Section *section);
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lldb_private::UUID
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GetSharedCacheUUID(lldb_private::FileSpec dyld_shared_cache,
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const lldb::ByteOrder byte_order,
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const uint32_t addr_byte_size);
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size_t ParseSymtab();
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typedef lldb_private::RangeArray<uint32_t, uint32_t, 8> EncryptedFileRanges;
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EncryptedFileRanges GetEncryptedFileRanges();
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struct SegmentParsingContext;
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void ProcessDysymtabCommand(const llvm::MachO::load_command &load_cmd,
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lldb::offset_t offset);
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void ProcessSegmentCommand(const llvm::MachO::load_command &load_cmd,
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lldb::offset_t offset, uint32_t cmd_idx,
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SegmentParsingContext &context);
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void SanitizeSegmentCommand(llvm::MachO::segment_command_64 &seg_cmd,
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uint32_t cmd_idx);
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bool SectionIsLoadable(const lldb_private::Section *section);
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llvm::MachO::mach_header m_header;
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static lldb_private::ConstString GetSegmentNameTEXT();
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static lldb_private::ConstString GetSegmentNameDATA();
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static lldb_private::ConstString GetSegmentNameDATA_DIRTY();
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static lldb_private::ConstString GetSegmentNameDATA_CONST();
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static lldb_private::ConstString GetSegmentNameOBJC();
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static lldb_private::ConstString GetSegmentNameLINKEDIT();
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static lldb_private::ConstString GetSegmentNameDWARF();
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static lldb_private::ConstString GetSectionNameEHFrame();
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llvm::MachO::dysymtab_command m_dysymtab;
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std::vector<llvm::MachO::segment_command_64> m_mach_segments;
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std::vector<llvm::MachO::section_64> m_mach_sections;
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llvm::Optional<llvm::VersionTuple> m_min_os_version;
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llvm::Optional<llvm::VersionTuple> m_sdk_versions;
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typedef lldb_private::RangeVector<uint32_t, uint32_t> FileRangeArray;
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lldb_private::Address m_entry_point_address;
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FileRangeArray m_thread_context_offsets;
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bool m_thread_context_offsets_valid;
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lldb_private::FileSpecList m_reexported_dylibs;
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bool m_allow_assembly_emulation_unwind_plans;
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};
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#endif // liblldb_ObjectFileMachO_h_
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