1 //===-- ProcessGDBRemote.h --------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLDB_SOURCE_PLUGINS_PROCESS_GDB_REMOTE_PROCESSGDBREMOTE_H 10 #define LLDB_SOURCE_PLUGINS_PROCESS_GDB_REMOTE_PROCESSGDBREMOTE_H 11 12 #include <atomic> 13 #include <map> 14 #include <mutex> 15 #include <string> 16 #include <vector> 17 18 #include "lldb/Core/LoadedModuleInfoList.h" 19 #include "lldb/Core/ModuleSpec.h" 20 #include "lldb/Core/ThreadSafeValue.h" 21 #include "lldb/Host/HostThread.h" 22 #include "lldb/Target/DynamicRegisterInfo.h" 23 #include "lldb/Target/Process.h" 24 #include "lldb/Target/Thread.h" 25 #include "lldb/Utility/ArchSpec.h" 26 #include "lldb/Utility/Broadcaster.h" 27 #include "lldb/Utility/ConstString.h" 28 #include "lldb/Utility/GDBRemote.h" 29 #include "lldb/Utility/Status.h" 30 #include "lldb/Utility/StreamString.h" 31 #include "lldb/Utility/StringExtractor.h" 32 #include "lldb/Utility/StringList.h" 33 #include "lldb/Utility/StructuredData.h" 34 #include "lldb/lldb-private-forward.h" 35 36 #include "GDBRemoteCommunicationClient.h" 37 #include "GDBRemoteRegisterContext.h" 38 39 #include "llvm/ADT/DenseMap.h" 40 41 namespace lldb_private { 42 namespace repro { 43 class Loader; 44 } 45 namespace process_gdb_remote { 46 47 class ThreadGDBRemote; 48 49 class ProcessGDBRemote : public Process, 50 private GDBRemoteClientBase::ContinueDelegate { 51 public: 52 ProcessGDBRemote(lldb::TargetSP target_sp, lldb::ListenerSP listener_sp); 53 54 ~ProcessGDBRemote() override; 55 56 static lldb::ProcessSP CreateInstance(lldb::TargetSP target_sp, 57 lldb::ListenerSP listener_sp, 58 const FileSpec *crash_file_path, 59 bool can_connect); 60 61 static void Initialize(); 62 63 static void DebuggerInitialize(Debugger &debugger); 64 65 static void Terminate(); 66 67 static llvm::StringRef GetPluginNameStatic() { return "gdb-remote"; } 68 69 static llvm::StringRef GetPluginDescriptionStatic(); 70 71 static std::chrono::seconds GetPacketTimeout(); 72 73 // Check if a given Process 74 bool CanDebug(lldb::TargetSP target_sp, 75 bool plugin_specified_by_name) override; 76 77 CommandObject *GetPluginCommandObject() override; 78 79 // Creating a new process, or attaching to an existing one 80 Status WillLaunch(Module *module) override; 81 82 Status DoLaunch(Module *exe_module, ProcessLaunchInfo &launch_info) override; 83 84 void DidLaunch() override; 85 86 Status WillAttachToProcessWithID(lldb::pid_t pid) override; 87 88 Status WillAttachToProcessWithName(const char *process_name, 89 bool wait_for_launch) override; 90 91 Status DoConnectRemote(llvm::StringRef remote_url) override; 92 93 Status WillLaunchOrAttach(); 94 95 Status DoAttachToProcessWithID(lldb::pid_t pid, 96 const ProcessAttachInfo &attach_info) override; 97 98 Status 99 DoAttachToProcessWithName(const char *process_name, 100 const ProcessAttachInfo &attach_info) override; 101 102 void DidAttach(ArchSpec &process_arch) override; 103 104 // PluginInterface protocol 105 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); } 106 107 // Process Control 108 Status WillResume() override; 109 110 Status DoResume() override; 111 112 Status DoHalt(bool &caused_stop) override; 113 114 Status DoDetach(bool keep_stopped) override; 115 116 bool DetachRequiresHalt() override { return true; } 117 118 Status DoSignal(int signal) override; 119 120 Status DoDestroy() override; 121 122 void RefreshStateAfterStop() override; 123 124 void SetUnixSignals(const lldb::UnixSignalsSP &signals_sp); 125 126 // Process Queries 127 bool IsAlive() override; 128 129 lldb::addr_t GetImageInfoAddress() override; 130 131 void WillPublicStop() override; 132 133 // Process Memory 134 size_t DoReadMemory(lldb::addr_t addr, void *buf, size_t size, 135 Status &error) override; 136 137 Status 138 WriteObjectFile(std::vector<ObjectFile::LoadableData> entries) override; 139 140 size_t DoWriteMemory(lldb::addr_t addr, const void *buf, size_t size, 141 Status &error) override; 142 143 lldb::addr_t DoAllocateMemory(size_t size, uint32_t permissions, 144 Status &error) override; 145 146 Status DoDeallocateMemory(lldb::addr_t ptr) override; 147 148 // Process STDIO 149 size_t PutSTDIN(const char *buf, size_t buf_size, Status &error) override; 150 151 // Process Breakpoints 152 Status EnableBreakpointSite(BreakpointSite *bp_site) override; 153 154 Status DisableBreakpointSite(BreakpointSite *bp_site) override; 155 156 // Process Watchpoints 157 Status EnableWatchpoint(Watchpoint *wp, bool notify = true) override; 158 159 Status DisableWatchpoint(Watchpoint *wp, bool notify = true) override; 160 161 Status GetWatchpointSupportInfo(uint32_t &num) override; 162 163 llvm::Expected<TraceSupportedResponse> TraceSupported() override; 164 165 llvm::Error TraceStop(const TraceStopRequest &request) override; 166 167 llvm::Error TraceStart(const llvm::json::Value &request) override; 168 169 llvm::Expected<std::string> TraceGetState(llvm::StringRef type) override; 170 171 llvm::Expected<std::vector<uint8_t>> 172 TraceGetBinaryData(const TraceGetBinaryDataRequest &request) override; 173 174 Status GetWatchpointSupportInfo(uint32_t &num, bool &after) override; 175 176 bool StartNoticingNewThreads() override; 177 178 bool StopNoticingNewThreads() override; 179 180 GDBRemoteCommunicationClient &GetGDBRemote() { return m_gdb_comm; } 181 182 Status SendEventData(const char *data) override; 183 184 // Override DidExit so we can disconnect from the remote GDB server 185 void DidExit() override; 186 187 void SetUserSpecifiedMaxMemoryTransferSize(uint64_t user_specified_max); 188 189 bool GetModuleSpec(const FileSpec &module_file_spec, const ArchSpec &arch, 190 ModuleSpec &module_spec) override; 191 192 void PrefetchModuleSpecs(llvm::ArrayRef<FileSpec> module_file_specs, 193 const llvm::Triple &triple) override; 194 195 llvm::VersionTuple GetHostOSVersion() override; 196 llvm::VersionTuple GetHostMacCatalystVersion() override; 197 198 llvm::Error LoadModules() override; 199 200 llvm::Expected<LoadedModuleInfoList> GetLoadedModuleList() override; 201 202 Status GetFileLoadAddress(const FileSpec &file, bool &is_loaded, 203 lldb::addr_t &load_addr) override; 204 205 void ModulesDidLoad(ModuleList &module_list) override; 206 207 StructuredData::ObjectSP 208 GetLoadedDynamicLibrariesInfos(lldb::addr_t image_list_address, 209 lldb::addr_t image_count) override; 210 211 Status 212 ConfigureStructuredData(ConstString type_name, 213 const StructuredData::ObjectSP &config_sp) override; 214 215 StructuredData::ObjectSP GetLoadedDynamicLibrariesInfos() override; 216 217 StructuredData::ObjectSP GetLoadedDynamicLibrariesInfos( 218 const std::vector<lldb::addr_t> &load_addresses) override; 219 220 StructuredData::ObjectSP 221 GetLoadedDynamicLibrariesInfos_sender(StructuredData::ObjectSP args); 222 223 StructuredData::ObjectSP GetSharedCacheInfo() override; 224 225 std::string HarmonizeThreadIdsForProfileData( 226 StringExtractorGDBRemote &inputStringExtractor); 227 228 void DidFork(lldb::pid_t child_pid, lldb::tid_t child_tid) override; 229 void DidVFork(lldb::pid_t child_pid, lldb::tid_t child_tid) override; 230 void DidVForkDone() override; 231 void DidExec() override; 232 233 llvm::Expected<bool> SaveCore(llvm::StringRef outfile) override; 234 235 protected: 236 friend class ThreadGDBRemote; 237 friend class GDBRemoteCommunicationClient; 238 friend class GDBRemoteRegisterContext; 239 240 bool SupportsMemoryTagging() override; 241 242 /// Broadcaster event bits definitions. 243 enum { 244 eBroadcastBitAsyncContinue = (1 << 0), 245 eBroadcastBitAsyncThreadShouldExit = (1 << 1), 246 eBroadcastBitAsyncThreadDidExit = (1 << 2) 247 }; 248 249 GDBRemoteCommunicationClient m_gdb_comm; 250 std::atomic<lldb::pid_t> m_debugserver_pid; 251 252 llvm::Optional<StringExtractorGDBRemote> m_last_stop_packet; 253 std::recursive_mutex m_last_stop_packet_mutex; 254 255 GDBRemoteDynamicRegisterInfoSP m_register_info_sp; 256 Broadcaster m_async_broadcaster; 257 lldb::ListenerSP m_async_listener_sp; 258 HostThread m_async_thread; 259 std::recursive_mutex m_async_thread_state_mutex; 260 typedef std::vector<lldb::tid_t> tid_collection; 261 typedef std::vector<std::pair<lldb::tid_t, int>> tid_sig_collection; 262 typedef std::map<lldb::addr_t, lldb::addr_t> MMapMap; 263 typedef std::map<uint32_t, std::string> ExpeditedRegisterMap; 264 tid_collection m_thread_ids; // Thread IDs for all threads. This list gets 265 // updated after stopping 266 std::vector<lldb::addr_t> m_thread_pcs; // PC values for all the threads. 267 StructuredData::ObjectSP m_jstopinfo_sp; // Stop info only for any threads 268 // that have valid stop infos 269 StructuredData::ObjectSP m_jthreadsinfo_sp; // Full stop info, expedited 270 // registers and memory for all 271 // threads if "jThreadsInfo" 272 // packet is supported 273 tid_collection m_continue_c_tids; // 'c' for continue 274 tid_sig_collection m_continue_C_tids; // 'C' for continue with signal 275 tid_collection m_continue_s_tids; // 's' for step 276 tid_sig_collection m_continue_S_tids; // 'S' for step with signal 277 uint64_t m_max_memory_size; // The maximum number of bytes to read/write when 278 // reading and writing memory 279 uint64_t m_remote_stub_max_memory_size; // The maximum memory size the remote 280 // gdb stub can handle 281 MMapMap m_addr_to_mmap_size; 282 lldb::BreakpointSP m_thread_create_bp_sp; 283 bool m_waiting_for_attach; 284 bool m_destroy_tried_resuming; 285 lldb::CommandObjectSP m_command_sp; 286 int64_t m_breakpoint_pc_offset; 287 lldb::tid_t m_initial_tid; // The initial thread ID, given by stub on attach 288 bool m_use_g_packet_for_reading; 289 290 bool m_allow_flash_writes; 291 using FlashRangeVector = lldb_private::RangeVector<lldb::addr_t, size_t>; 292 using FlashRange = FlashRangeVector::Entry; 293 FlashRangeVector m_erased_flash_ranges; 294 295 bool m_vfork_in_progress; 296 297 // Accessors 298 bool IsRunning(lldb::StateType state) { 299 return state == lldb::eStateRunning || IsStepping(state); 300 } 301 302 bool IsStepping(lldb::StateType state) { 303 return state == lldb::eStateStepping; 304 } 305 306 bool CanResume(lldb::StateType state) { return state == lldb::eStateStopped; } 307 308 bool HasExited(lldb::StateType state) { return state == lldb::eStateExited; } 309 310 bool ProcessIDIsValid() const; 311 312 void Clear(); 313 314 bool DoUpdateThreadList(ThreadList &old_thread_list, 315 ThreadList &new_thread_list) override; 316 317 Status EstablishConnectionIfNeeded(const ProcessInfo &process_info); 318 319 Status LaunchAndConnectToDebugserver(const ProcessInfo &process_info); 320 321 void KillDebugserverProcess(); 322 323 void BuildDynamicRegisterInfo(bool force); 324 325 void SetLastStopPacket(const StringExtractorGDBRemote &response); 326 327 bool ParsePythonTargetDefinition(const FileSpec &target_definition_fspec); 328 329 DataExtractor GetAuxvData() override; 330 331 StructuredData::ObjectSP GetExtendedInfoForThread(lldb::tid_t tid); 332 333 void GetMaxMemorySize(); 334 335 bool CalculateThreadStopInfo(ThreadGDBRemote *thread); 336 337 size_t UpdateThreadPCsFromStopReplyThreadsValue(llvm::StringRef value); 338 339 size_t UpdateThreadIDsFromStopReplyThreadsValue(llvm::StringRef value); 340 341 bool StartAsyncThread(); 342 343 void StopAsyncThread(); 344 345 static lldb::thread_result_t AsyncThread(void *arg); 346 347 static bool 348 MonitorDebugserverProcess(std::weak_ptr<ProcessGDBRemote> process_wp, 349 lldb::pid_t pid, bool exited, int signo, 350 int exit_status); 351 352 lldb::StateType SetThreadStopInfo(StringExtractor &stop_packet); 353 354 bool 355 GetThreadStopInfoFromJSON(ThreadGDBRemote *thread, 356 const StructuredData::ObjectSP &thread_infos_sp); 357 358 lldb::ThreadSP SetThreadStopInfo(StructuredData::Dictionary *thread_dict); 359 360 lldb::ThreadSP 361 SetThreadStopInfo(lldb::tid_t tid, 362 ExpeditedRegisterMap &expedited_register_map, uint8_t signo, 363 const std::string &thread_name, const std::string &reason, 364 const std::string &description, uint32_t exc_type, 365 const std::vector<lldb::addr_t> &exc_data, 366 lldb::addr_t thread_dispatch_qaddr, bool queue_vars_valid, 367 lldb_private::LazyBool associated_with_libdispatch_queue, 368 lldb::addr_t dispatch_queue_t, std::string &queue_name, 369 lldb::QueueKind queue_kind, uint64_t queue_serial); 370 371 void ClearThreadIDList(); 372 373 bool UpdateThreadIDList(); 374 375 void DidLaunchOrAttach(ArchSpec &process_arch); 376 void MaybeLoadExecutableModule(); 377 378 Status ConnectToDebugserver(llvm::StringRef host_port); 379 380 const char *GetDispatchQueueNameForThread(lldb::addr_t thread_dispatch_qaddr, 381 std::string &dispatch_queue_name); 382 383 DynamicLoader *GetDynamicLoader() override; 384 385 bool GetGDBServerRegisterInfoXMLAndProcess( 386 ArchSpec &arch_to_use, std::string xml_filename, 387 std::vector<DynamicRegisterInfo::Register> ®isters); 388 389 // Convert DynamicRegisterInfo::Registers into RegisterInfos and add 390 // to the dynamic register list. 391 void AddRemoteRegisters(std::vector<DynamicRegisterInfo::Register> ®isters, 392 const ArchSpec &arch_to_use); 393 // Query remote GDBServer for register information 394 bool GetGDBServerRegisterInfo(ArchSpec &arch); 395 396 lldb::ModuleSP LoadModuleAtAddress(const FileSpec &file, 397 lldb::addr_t link_map, 398 lldb::addr_t base_addr, 399 bool value_is_offset); 400 401 Status UpdateAutomaticSignalFiltering() override; 402 403 Status FlashErase(lldb::addr_t addr, size_t size); 404 405 Status FlashDone(); 406 407 bool HasErased(FlashRange range); 408 409 llvm::Expected<std::vector<uint8_t>> 410 DoReadMemoryTags(lldb::addr_t addr, size_t len, int32_t type) override; 411 412 Status DoWriteMemoryTags(lldb::addr_t addr, size_t len, int32_t type, 413 const std::vector<uint8_t> &tags) override; 414 415 Status DoGetMemoryRegionInfo(lldb::addr_t load_addr, 416 MemoryRegionInfo ®ion_info) override; 417 418 private: 419 // For ProcessGDBRemote only 420 std::string m_partial_profile_data; 421 std::map<uint64_t, uint32_t> m_thread_id_to_used_usec_map; 422 uint64_t m_last_signals_version = 0; 423 424 static bool NewThreadNotifyBreakpointHit(void *baton, 425 StoppointCallbackContext *context, 426 lldb::user_id_t break_id, 427 lldb::user_id_t break_loc_id); 428 429 // ContinueDelegate interface 430 void HandleAsyncStdout(llvm::StringRef out) override; 431 void HandleAsyncMisc(llvm::StringRef data) override; 432 void HandleStopReply() override; 433 void HandleAsyncStructuredDataPacket(llvm::StringRef data) override; 434 435 void SetThreadPc(const lldb::ThreadSP &thread_sp, uint64_t index); 436 using ModuleCacheKey = std::pair<std::string, std::string>; 437 // KeyInfo for the cached module spec DenseMap. 438 // The invariant is that all real keys will have the file and architecture 439 // set. 440 // The empty key has an empty file and an empty arch. 441 // The tombstone key has an invalid arch and an empty file. 442 // The comparison and hash functions take the file name and architecture 443 // triple into account. 444 struct ModuleCacheInfo { 445 static ModuleCacheKey getEmptyKey() { return ModuleCacheKey(); } 446 447 static ModuleCacheKey getTombstoneKey() { return ModuleCacheKey("", "T"); } 448 449 static unsigned getHashValue(const ModuleCacheKey &key) { 450 return llvm::hash_combine(key.first, key.second); 451 } 452 453 static bool isEqual(const ModuleCacheKey &LHS, const ModuleCacheKey &RHS) { 454 return LHS == RHS; 455 } 456 }; 457 458 llvm::DenseMap<ModuleCacheKey, ModuleSpec, ModuleCacheInfo> 459 m_cached_module_specs; 460 461 ProcessGDBRemote(const ProcessGDBRemote &) = delete; 462 const ProcessGDBRemote &operator=(const ProcessGDBRemote &) = delete; 463 464 // fork helpers 465 void DidForkSwitchSoftwareBreakpoints(bool enable); 466 void DidForkSwitchHardwareTraps(bool enable); 467 }; 468 469 } // namespace process_gdb_remote 470 } // namespace lldb_private 471 472 #endif // LLDB_SOURCE_PLUGINS_PROCESS_GDB_REMOTE_PROCESSGDBREMOTE_H 473