1 //===-- ProcessKDP.cpp ------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // C Includes 11 #include <errno.h> 12 #include <stdlib.h> 13 14 // C++ Includes 15 #include <mutex> 16 17 // Other libraries and framework includes 18 #include "lldb/Core/Debugger.h" 19 #include "lldb/Core/Module.h" 20 #include "lldb/Core/ModuleSpec.h" 21 #include "lldb/Core/PluginManager.h" 22 #include "lldb/Core/State.h" 23 #include "lldb/Core/UUID.h" 24 #include "lldb/Host/ConnectionFileDescriptor.h" 25 #include "lldb/Host/Host.h" 26 #include "lldb/Host/Symbols.h" 27 #include "lldb/Host/ThreadLauncher.h" 28 #include "lldb/Host/common/TCPSocket.h" 29 #include "lldb/Interpreter/CommandInterpreter.h" 30 #include "lldb/Interpreter/CommandObject.h" 31 #include "lldb/Interpreter/CommandObjectMultiword.h" 32 #include "lldb/Interpreter/CommandReturnObject.h" 33 #include "lldb/Interpreter/OptionGroupString.h" 34 #include "lldb/Interpreter/OptionGroupUInt64.h" 35 #include "lldb/Interpreter/OptionValueProperties.h" 36 #include "lldb/Symbol/ObjectFile.h" 37 #include "lldb/Target/RegisterContext.h" 38 #include "lldb/Target/Target.h" 39 #include "lldb/Target/Thread.h" 40 #include "lldb/Utility/StringExtractor.h" 41 42 #include "llvm/Support/Threading.h" 43 44 #define USEC_PER_SEC 1000000 45 46 // Project includes 47 #include "Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.h" 48 #include "Plugins/DynamicLoader/Static/DynamicLoaderStatic.h" 49 #include "ProcessKDP.h" 50 #include "ProcessKDPLog.h" 51 #include "ThreadKDP.h" 52 53 using namespace lldb; 54 using namespace lldb_private; 55 56 namespace { 57 58 static PropertyDefinition g_properties[] = { 59 {"packet-timeout", OptionValue::eTypeUInt64, true, 5, NULL, NULL, 60 "Specify the default packet timeout in seconds."}, 61 {NULL, OptionValue::eTypeInvalid, false, 0, NULL, NULL, NULL}}; 62 63 enum { ePropertyPacketTimeout }; 64 65 class PluginProperties : public Properties { 66 public: 67 static ConstString GetSettingName() { 68 return ProcessKDP::GetPluginNameStatic(); 69 } 70 71 PluginProperties() : Properties() { 72 m_collection_sp.reset(new OptionValueProperties(GetSettingName())); 73 m_collection_sp->Initialize(g_properties); 74 } 75 76 virtual ~PluginProperties() {} 77 78 uint64_t GetPacketTimeout() { 79 const uint32_t idx = ePropertyPacketTimeout; 80 return m_collection_sp->GetPropertyAtIndexAsUInt64( 81 NULL, idx, g_properties[idx].default_uint_value); 82 } 83 }; 84 85 typedef std::shared_ptr<PluginProperties> ProcessKDPPropertiesSP; 86 87 static const ProcessKDPPropertiesSP &GetGlobalPluginProperties() { 88 static ProcessKDPPropertiesSP g_settings_sp; 89 if (!g_settings_sp) 90 g_settings_sp.reset(new PluginProperties()); 91 return g_settings_sp; 92 } 93 94 } // anonymous namespace end 95 96 static const lldb::tid_t g_kernel_tid = 1; 97 98 ConstString ProcessKDP::GetPluginNameStatic() { 99 static ConstString g_name("kdp-remote"); 100 return g_name; 101 } 102 103 const char *ProcessKDP::GetPluginDescriptionStatic() { 104 return "KDP Remote protocol based debugging plug-in for darwin kernel " 105 "debugging."; 106 } 107 108 void ProcessKDP::Terminate() { 109 PluginManager::UnregisterPlugin(ProcessKDP::CreateInstance); 110 } 111 112 lldb::ProcessSP ProcessKDP::CreateInstance(TargetSP target_sp, 113 ListenerSP listener_sp, 114 const FileSpec *crash_file_path) { 115 lldb::ProcessSP process_sp; 116 if (crash_file_path == NULL) 117 process_sp.reset(new ProcessKDP(target_sp, listener_sp)); 118 return process_sp; 119 } 120 121 bool ProcessKDP::CanDebug(TargetSP target_sp, bool plugin_specified_by_name) { 122 if (plugin_specified_by_name) 123 return true; 124 125 // For now we are just making sure the file exists for a given module 126 Module *exe_module = target_sp->GetExecutableModulePointer(); 127 if (exe_module) { 128 const llvm::Triple &triple_ref = target_sp->GetArchitecture().GetTriple(); 129 switch (triple_ref.getOS()) { 130 case llvm::Triple::Darwin: // Should use "macosx" for desktop and "ios" for 131 // iOS, but accept darwin just in case 132 case llvm::Triple::MacOSX: // For desktop targets 133 case llvm::Triple::IOS: // For arm targets 134 case llvm::Triple::TvOS: 135 case llvm::Triple::WatchOS: 136 if (triple_ref.getVendor() == llvm::Triple::Apple) { 137 ObjectFile *exe_objfile = exe_module->GetObjectFile(); 138 if (exe_objfile->GetType() == ObjectFile::eTypeExecutable && 139 exe_objfile->GetStrata() == ObjectFile::eStrataKernel) 140 return true; 141 } 142 break; 143 144 default: 145 break; 146 } 147 } 148 return false; 149 } 150 151 //---------------------------------------------------------------------- 152 // ProcessKDP constructor 153 //---------------------------------------------------------------------- 154 ProcessKDP::ProcessKDP(TargetSP target_sp, ListenerSP listener_sp) 155 : Process(target_sp, listener_sp), 156 m_comm("lldb.process.kdp-remote.communication"), 157 m_async_broadcaster(NULL, "lldb.process.kdp-remote.async-broadcaster"), 158 m_dyld_plugin_name(), m_kernel_load_addr(LLDB_INVALID_ADDRESS), 159 m_command_sp(), m_kernel_thread_wp() { 160 m_async_broadcaster.SetEventName(eBroadcastBitAsyncThreadShouldExit, 161 "async thread should exit"); 162 m_async_broadcaster.SetEventName(eBroadcastBitAsyncContinue, 163 "async thread continue"); 164 const uint64_t timeout_seconds = 165 GetGlobalPluginProperties()->GetPacketTimeout(); 166 if (timeout_seconds > 0) 167 m_comm.SetPacketTimeout(std::chrono::seconds(timeout_seconds)); 168 } 169 170 //---------------------------------------------------------------------- 171 // Destructor 172 //---------------------------------------------------------------------- 173 ProcessKDP::~ProcessKDP() { 174 Clear(); 175 // We need to call finalize on the process before destroying ourselves 176 // to make sure all of the broadcaster cleanup goes as planned. If we 177 // destruct this class, then Process::~Process() might have problems 178 // trying to fully destroy the broadcaster. 179 Finalize(); 180 } 181 182 //---------------------------------------------------------------------- 183 // PluginInterface 184 //---------------------------------------------------------------------- 185 lldb_private::ConstString ProcessKDP::GetPluginName() { 186 return GetPluginNameStatic(); 187 } 188 189 uint32_t ProcessKDP::GetPluginVersion() { return 1; } 190 191 Error ProcessKDP::WillLaunch(Module *module) { 192 Error error; 193 error.SetErrorString("launching not supported in kdp-remote plug-in"); 194 return error; 195 } 196 197 Error ProcessKDP::WillAttachToProcessWithID(lldb::pid_t pid) { 198 Error error; 199 error.SetErrorString( 200 "attaching to a by process ID not supported in kdp-remote plug-in"); 201 return error; 202 } 203 204 Error ProcessKDP::WillAttachToProcessWithName(const char *process_name, 205 bool wait_for_launch) { 206 Error error; 207 error.SetErrorString( 208 "attaching to a by process name not supported in kdp-remote plug-in"); 209 return error; 210 } 211 212 bool ProcessKDP::GetHostArchitecture(ArchSpec &arch) { 213 uint32_t cpu = m_comm.GetCPUType(); 214 if (cpu) { 215 uint32_t sub = m_comm.GetCPUSubtype(); 216 arch.SetArchitecture(eArchTypeMachO, cpu, sub); 217 // Leave architecture vendor as unspecified unknown 218 arch.GetTriple().setVendor(llvm::Triple::UnknownVendor); 219 arch.GetTriple().setVendorName(llvm::StringRef()); 220 return true; 221 } 222 arch.Clear(); 223 return false; 224 } 225 226 Error ProcessKDP::DoConnectRemote(Stream *strm, llvm::StringRef remote_url) { 227 Error error; 228 229 // Don't let any JIT happen when doing KDP as we can't allocate 230 // memory and we don't want to be mucking with threads that might 231 // already be handling exceptions 232 SetCanJIT(false); 233 234 if (remote_url.empty()) { 235 error.SetErrorStringWithFormat("empty connection URL"); 236 return error; 237 } 238 239 std::unique_ptr<ConnectionFileDescriptor> conn_ap( 240 new ConnectionFileDescriptor()); 241 if (conn_ap.get()) { 242 // Only try once for now. 243 // TODO: check if we should be retrying? 244 const uint32_t max_retry_count = 1; 245 for (uint32_t retry_count = 0; retry_count < max_retry_count; 246 ++retry_count) { 247 if (conn_ap->Connect(remote_url, &error) == eConnectionStatusSuccess) 248 break; 249 usleep(100000); 250 } 251 } 252 253 if (conn_ap->IsConnected()) { 254 const TCPSocket &socket = 255 static_cast<const TCPSocket &>(*conn_ap->GetReadObject()); 256 const uint16_t reply_port = socket.GetLocalPortNumber(); 257 258 if (reply_port != 0) { 259 m_comm.SetConnection(conn_ap.release()); 260 261 if (m_comm.SendRequestReattach(reply_port)) { 262 if (m_comm.SendRequestConnect(reply_port, reply_port, 263 "Greetings from LLDB...")) { 264 m_comm.GetVersion(); 265 266 Target &target = GetTarget(); 267 ArchSpec kernel_arch; 268 // The host architecture 269 GetHostArchitecture(kernel_arch); 270 ArchSpec target_arch = target.GetArchitecture(); 271 // Merge in any unspecified stuff into the target architecture in 272 // case the target arch isn't set at all or incompletely. 273 target_arch.MergeFrom(kernel_arch); 274 target.SetArchitecture(target_arch); 275 276 /* Get the kernel's UUID and load address via KDP_KERNELVERSION 277 * packet. */ 278 /* An EFI kdp session has neither UUID nor load address. */ 279 280 UUID kernel_uuid = m_comm.GetUUID(); 281 addr_t kernel_load_addr = m_comm.GetLoadAddress(); 282 283 if (m_comm.RemoteIsEFI()) { 284 // Select an invalid plugin name for the dynamic loader so one 285 // doesn't get used 286 // since EFI does its own manual loading via python scripting 287 static ConstString g_none_dynamic_loader("none"); 288 m_dyld_plugin_name = g_none_dynamic_loader; 289 290 if (kernel_uuid.IsValid()) { 291 // If EFI passed in a UUID= try to lookup UUID 292 // The slide will not be provided. But the UUID 293 // lookup will be used to launch EFI debug scripts 294 // from the dSYM, that can load all of the symbols. 295 ModuleSpec module_spec; 296 module_spec.GetUUID() = kernel_uuid; 297 module_spec.GetArchitecture() = target.GetArchitecture(); 298 299 // Lookup UUID locally, before attempting dsymForUUID like action 300 module_spec.GetSymbolFileSpec() = 301 Symbols::LocateExecutableSymbolFile(module_spec); 302 if (module_spec.GetSymbolFileSpec()) { 303 ModuleSpec executable_module_spec = 304 Symbols::LocateExecutableObjectFile(module_spec); 305 if (executable_module_spec.GetFileSpec().Exists()) { 306 module_spec.GetFileSpec() = 307 executable_module_spec.GetFileSpec(); 308 } 309 } 310 if (!module_spec.GetSymbolFileSpec() || 311 !module_spec.GetSymbolFileSpec()) 312 Symbols::DownloadObjectAndSymbolFile(module_spec, true); 313 314 if (module_spec.GetFileSpec().Exists()) { 315 ModuleSP module_sp(new Module(module_spec)); 316 if (module_sp.get() && module_sp->GetObjectFile()) { 317 // Get the current target executable 318 ModuleSP exe_module_sp(target.GetExecutableModule()); 319 320 // Make sure you don't already have the right module loaded 321 // and they will be uniqued 322 if (exe_module_sp.get() != module_sp.get()) 323 target.SetExecutableModule(module_sp, false); 324 } 325 } 326 } 327 } else if (m_comm.RemoteIsDarwinKernel()) { 328 m_dyld_plugin_name = 329 DynamicLoaderDarwinKernel::GetPluginNameStatic(); 330 if (kernel_load_addr != LLDB_INVALID_ADDRESS) { 331 m_kernel_load_addr = kernel_load_addr; 332 } 333 } 334 335 // Set the thread ID 336 UpdateThreadListIfNeeded(); 337 SetID(1); 338 GetThreadList(); 339 SetPrivateState(eStateStopped); 340 StreamSP async_strm_sp(target.GetDebugger().GetAsyncOutputStream()); 341 if (async_strm_sp) { 342 const char *cstr; 343 if ((cstr = m_comm.GetKernelVersion()) != NULL) { 344 async_strm_sp->Printf("Version: %s\n", cstr); 345 async_strm_sp->Flush(); 346 } 347 // if ((cstr = m_comm.GetImagePath ()) != NULL) 348 // { 349 // async_strm_sp->Printf ("Image Path: 350 // %s\n", cstr); 351 // async_strm_sp->Flush(); 352 // } 353 } 354 } else { 355 error.SetErrorString("KDP_REATTACH failed"); 356 } 357 } else { 358 error.SetErrorString("KDP_REATTACH failed"); 359 } 360 } else { 361 error.SetErrorString("invalid reply port from UDP connection"); 362 } 363 } else { 364 if (error.Success()) 365 error.SetErrorStringWithFormat("failed to connect to '%s'", 366 remote_url.str().c_str()); 367 } 368 if (error.Fail()) 369 m_comm.Disconnect(); 370 371 return error; 372 } 373 374 //---------------------------------------------------------------------- 375 // Process Control 376 //---------------------------------------------------------------------- 377 Error ProcessKDP::DoLaunch(Module *exe_module, ProcessLaunchInfo &launch_info) { 378 Error error; 379 error.SetErrorString("launching not supported in kdp-remote plug-in"); 380 return error; 381 } 382 383 Error ProcessKDP::DoAttachToProcessWithID( 384 lldb::pid_t attach_pid, const ProcessAttachInfo &attach_info) { 385 Error error; 386 error.SetErrorString( 387 "attach to process by ID is not suppported in kdp remote debugging"); 388 return error; 389 } 390 391 Error ProcessKDP::DoAttachToProcessWithName( 392 const char *process_name, const ProcessAttachInfo &attach_info) { 393 Error error; 394 error.SetErrorString( 395 "attach to process by name is not suppported in kdp remote debugging"); 396 return error; 397 } 398 399 void ProcessKDP::DidAttach(ArchSpec &process_arch) { 400 Process::DidAttach(process_arch); 401 402 Log *log(ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_PROCESS)); 403 if (log) 404 log->Printf("ProcessKDP::DidAttach()"); 405 if (GetID() != LLDB_INVALID_PROCESS_ID) { 406 GetHostArchitecture(process_arch); 407 } 408 } 409 410 addr_t ProcessKDP::GetImageInfoAddress() { return m_kernel_load_addr; } 411 412 lldb_private::DynamicLoader *ProcessKDP::GetDynamicLoader() { 413 if (m_dyld_ap.get() == NULL) 414 m_dyld_ap.reset(DynamicLoader::FindPlugin( 415 this, 416 m_dyld_plugin_name.IsEmpty() ? NULL : m_dyld_plugin_name.GetCString())); 417 return m_dyld_ap.get(); 418 } 419 420 Error ProcessKDP::WillResume() { return Error(); } 421 422 Error ProcessKDP::DoResume() { 423 Error error; 424 Log *log(ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_PROCESS)); 425 // Only start the async thread if we try to do any process control 426 if (!m_async_thread.IsJoinable()) 427 StartAsyncThread(); 428 429 bool resume = false; 430 431 // With KDP there is only one thread we can tell what to do 432 ThreadSP kernel_thread_sp(m_thread_list.FindThreadByProtocolID(g_kernel_tid)); 433 434 if (kernel_thread_sp) { 435 const StateType thread_resume_state = 436 kernel_thread_sp->GetTemporaryResumeState(); 437 438 if (log) 439 log->Printf("ProcessKDP::DoResume() thread_resume_state = %s", 440 StateAsCString(thread_resume_state)); 441 switch (thread_resume_state) { 442 case eStateSuspended: 443 // Nothing to do here when a thread will stay suspended 444 // we just leave the CPU mask bit set to zero for the thread 445 if (log) 446 log->Printf("ProcessKDP::DoResume() = suspended???"); 447 break; 448 449 case eStateStepping: { 450 lldb::RegisterContextSP reg_ctx_sp( 451 kernel_thread_sp->GetRegisterContext()); 452 453 if (reg_ctx_sp) { 454 if (log) 455 log->Printf( 456 "ProcessKDP::DoResume () reg_ctx_sp->HardwareSingleStep (true);"); 457 reg_ctx_sp->HardwareSingleStep(true); 458 resume = true; 459 } else { 460 error.SetErrorStringWithFormat( 461 "KDP thread 0x%llx has no register context", 462 kernel_thread_sp->GetID()); 463 } 464 } break; 465 466 case eStateRunning: { 467 lldb::RegisterContextSP reg_ctx_sp( 468 kernel_thread_sp->GetRegisterContext()); 469 470 if (reg_ctx_sp) { 471 if (log) 472 log->Printf("ProcessKDP::DoResume () reg_ctx_sp->HardwareSingleStep " 473 "(false);"); 474 reg_ctx_sp->HardwareSingleStep(false); 475 resume = true; 476 } else { 477 error.SetErrorStringWithFormat( 478 "KDP thread 0x%llx has no register context", 479 kernel_thread_sp->GetID()); 480 } 481 } break; 482 483 default: 484 // The only valid thread resume states are listed above 485 llvm_unreachable("invalid thread resume state"); 486 } 487 } 488 489 if (resume) { 490 if (log) 491 log->Printf("ProcessKDP::DoResume () sending resume"); 492 493 if (m_comm.SendRequestResume()) { 494 m_async_broadcaster.BroadcastEvent(eBroadcastBitAsyncContinue); 495 SetPrivateState(eStateRunning); 496 } else 497 error.SetErrorString("KDP resume failed"); 498 } else { 499 error.SetErrorString("kernel thread is suspended"); 500 } 501 502 return error; 503 } 504 505 lldb::ThreadSP ProcessKDP::GetKernelThread() { 506 // KDP only tells us about one thread/core. Any other threads will usually 507 // be the ones that are read from memory by the OS plug-ins. 508 509 ThreadSP thread_sp(m_kernel_thread_wp.lock()); 510 if (!thread_sp) { 511 thread_sp.reset(new ThreadKDP(*this, g_kernel_tid)); 512 m_kernel_thread_wp = thread_sp; 513 } 514 return thread_sp; 515 } 516 517 bool ProcessKDP::UpdateThreadList(ThreadList &old_thread_list, 518 ThreadList &new_thread_list) { 519 // locker will keep a mutex locked until it goes out of scope 520 Log *log(ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_THREAD)); 521 LLDB_LOGV(log, "pid = {0}", GetID()); 522 523 // Even though there is a CPU mask, it doesn't mean we can see each CPU 524 // individually, there is really only one. Lets call this thread 1. 525 ThreadSP thread_sp( 526 old_thread_list.FindThreadByProtocolID(g_kernel_tid, false)); 527 if (!thread_sp) 528 thread_sp = GetKernelThread(); 529 new_thread_list.AddThread(thread_sp); 530 531 return new_thread_list.GetSize(false) > 0; 532 } 533 534 void ProcessKDP::RefreshStateAfterStop() { 535 // Let all threads recover from stopping and do any clean up based 536 // on the previous thread state (if any). 537 m_thread_list.RefreshStateAfterStop(); 538 } 539 540 Error ProcessKDP::DoHalt(bool &caused_stop) { 541 Error error; 542 543 if (m_comm.IsRunning()) { 544 if (m_destroy_in_process) { 545 // If we are attemping to destroy, we need to not return an error to 546 // Halt or DoDestroy won't get called. 547 // We are also currently running, so send a process stopped event 548 SetPrivateState(eStateStopped); 549 } else { 550 error.SetErrorString("KDP cannot interrupt a running kernel"); 551 } 552 } 553 return error; 554 } 555 556 Error ProcessKDP::DoDetach(bool keep_stopped) { 557 Error error; 558 Log *log(ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_PROCESS)); 559 if (log) 560 log->Printf("ProcessKDP::DoDetach(keep_stopped = %i)", keep_stopped); 561 562 if (m_comm.IsRunning()) { 563 // We are running and we can't interrupt a running kernel, so we need 564 // to just close the connection to the kernel and hope for the best 565 } else { 566 // If we are going to keep the target stopped, then don't send the 567 // disconnect message. 568 if (!keep_stopped && m_comm.IsConnected()) { 569 const bool success = m_comm.SendRequestDisconnect(); 570 if (log) { 571 if (success) 572 log->PutCString( 573 "ProcessKDP::DoDetach() detach packet sent successfully"); 574 else 575 log->PutCString( 576 "ProcessKDP::DoDetach() connection channel shutdown failed"); 577 } 578 m_comm.Disconnect(); 579 } 580 } 581 StopAsyncThread(); 582 m_comm.Clear(); 583 584 SetPrivateState(eStateDetached); 585 ResumePrivateStateThread(); 586 587 // KillDebugserverProcess (); 588 return error; 589 } 590 591 Error ProcessKDP::DoDestroy() { 592 // For KDP there really is no difference between destroy and detach 593 bool keep_stopped = false; 594 return DoDetach(keep_stopped); 595 } 596 597 //------------------------------------------------------------------ 598 // Process Queries 599 //------------------------------------------------------------------ 600 601 bool ProcessKDP::IsAlive() { 602 return m_comm.IsConnected() && Process::IsAlive(); 603 } 604 605 //------------------------------------------------------------------ 606 // Process Memory 607 //------------------------------------------------------------------ 608 size_t ProcessKDP::DoReadMemory(addr_t addr, void *buf, size_t size, 609 Error &error) { 610 uint8_t *data_buffer = (uint8_t *)buf; 611 if (m_comm.IsConnected()) { 612 const size_t max_read_size = 512; 613 size_t total_bytes_read = 0; 614 615 // Read the requested amount of memory in 512 byte chunks 616 while (total_bytes_read < size) { 617 size_t bytes_to_read_this_request = size - total_bytes_read; 618 if (bytes_to_read_this_request > max_read_size) { 619 bytes_to_read_this_request = max_read_size; 620 } 621 size_t bytes_read = m_comm.SendRequestReadMemory( 622 addr + total_bytes_read, data_buffer + total_bytes_read, 623 bytes_to_read_this_request, error); 624 total_bytes_read += bytes_read; 625 if (error.Fail() || bytes_read == 0) { 626 return total_bytes_read; 627 } 628 } 629 630 return total_bytes_read; 631 } 632 error.SetErrorString("not connected"); 633 return 0; 634 } 635 636 size_t ProcessKDP::DoWriteMemory(addr_t addr, const void *buf, size_t size, 637 Error &error) { 638 if (m_comm.IsConnected()) 639 return m_comm.SendRequestWriteMemory(addr, buf, size, error); 640 error.SetErrorString("not connected"); 641 return 0; 642 } 643 644 lldb::addr_t ProcessKDP::DoAllocateMemory(size_t size, uint32_t permissions, 645 Error &error) { 646 error.SetErrorString( 647 "memory allocation not suppported in kdp remote debugging"); 648 return LLDB_INVALID_ADDRESS; 649 } 650 651 Error ProcessKDP::DoDeallocateMemory(lldb::addr_t addr) { 652 Error error; 653 error.SetErrorString( 654 "memory deallocation not suppported in kdp remote debugging"); 655 return error; 656 } 657 658 Error ProcessKDP::EnableBreakpointSite(BreakpointSite *bp_site) { 659 if (m_comm.LocalBreakpointsAreSupported()) { 660 Error error; 661 if (!bp_site->IsEnabled()) { 662 if (m_comm.SendRequestBreakpoint(true, bp_site->GetLoadAddress())) { 663 bp_site->SetEnabled(true); 664 bp_site->SetType(BreakpointSite::eExternal); 665 } else { 666 error.SetErrorString("KDP set breakpoint failed"); 667 } 668 } 669 return error; 670 } 671 return EnableSoftwareBreakpoint(bp_site); 672 } 673 674 Error ProcessKDP::DisableBreakpointSite(BreakpointSite *bp_site) { 675 if (m_comm.LocalBreakpointsAreSupported()) { 676 Error error; 677 if (bp_site->IsEnabled()) { 678 BreakpointSite::Type bp_type = bp_site->GetType(); 679 if (bp_type == BreakpointSite::eExternal) { 680 if (m_destroy_in_process && m_comm.IsRunning()) { 681 // We are trying to destroy our connection and we are running 682 bp_site->SetEnabled(false); 683 } else { 684 if (m_comm.SendRequestBreakpoint(false, bp_site->GetLoadAddress())) 685 bp_site->SetEnabled(false); 686 else 687 error.SetErrorString("KDP remove breakpoint failed"); 688 } 689 } else { 690 error = DisableSoftwareBreakpoint(bp_site); 691 } 692 } 693 return error; 694 } 695 return DisableSoftwareBreakpoint(bp_site); 696 } 697 698 Error ProcessKDP::EnableWatchpoint(Watchpoint *wp, bool notify) { 699 Error error; 700 error.SetErrorString( 701 "watchpoints are not suppported in kdp remote debugging"); 702 return error; 703 } 704 705 Error ProcessKDP::DisableWatchpoint(Watchpoint *wp, bool notify) { 706 Error error; 707 error.SetErrorString( 708 "watchpoints are not suppported in kdp remote debugging"); 709 return error; 710 } 711 712 void ProcessKDP::Clear() { m_thread_list.Clear(); } 713 714 Error ProcessKDP::DoSignal(int signo) { 715 Error error; 716 error.SetErrorString( 717 "sending signals is not suppported in kdp remote debugging"); 718 return error; 719 } 720 721 void ProcessKDP::Initialize() { 722 static llvm::once_flag g_once_flag; 723 724 llvm::call_once(g_once_flag, []() { 725 PluginManager::RegisterPlugin(GetPluginNameStatic(), 726 GetPluginDescriptionStatic(), CreateInstance, 727 DebuggerInitialize); 728 729 ProcessKDPLog::Initialize(); 730 }); 731 } 732 733 void ProcessKDP::DebuggerInitialize(lldb_private::Debugger &debugger) { 734 if (!PluginManager::GetSettingForProcessPlugin( 735 debugger, PluginProperties::GetSettingName())) { 736 const bool is_global_setting = true; 737 PluginManager::CreateSettingForProcessPlugin( 738 debugger, GetGlobalPluginProperties()->GetValueProperties(), 739 ConstString("Properties for the kdp-remote process plug-in."), 740 is_global_setting); 741 } 742 } 743 744 bool ProcessKDP::StartAsyncThread() { 745 Log *log(ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_PROCESS)); 746 747 if (log) 748 log->Printf("ProcessKDP::StartAsyncThread ()"); 749 750 if (m_async_thread.IsJoinable()) 751 return true; 752 753 m_async_thread = ThreadLauncher::LaunchThread( 754 "<lldb.process.kdp-remote.async>", ProcessKDP::AsyncThread, this, NULL); 755 return m_async_thread.IsJoinable(); 756 } 757 758 void ProcessKDP::StopAsyncThread() { 759 Log *log(ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_PROCESS)); 760 761 if (log) 762 log->Printf("ProcessKDP::StopAsyncThread ()"); 763 764 m_async_broadcaster.BroadcastEvent(eBroadcastBitAsyncThreadShouldExit); 765 766 // Stop the stdio thread 767 if (m_async_thread.IsJoinable()) 768 m_async_thread.Join(nullptr); 769 } 770 771 void *ProcessKDP::AsyncThread(void *arg) { 772 ProcessKDP *process = (ProcessKDP *)arg; 773 774 const lldb::pid_t pid = process->GetID(); 775 776 Log *log(ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_PROCESS)); 777 if (log) 778 log->Printf("ProcessKDP::AsyncThread (arg = %p, pid = %" PRIu64 779 ") thread starting...", 780 arg, pid); 781 782 ListenerSP listener_sp(Listener::MakeListener("ProcessKDP::AsyncThread")); 783 EventSP event_sp; 784 const uint32_t desired_event_mask = 785 eBroadcastBitAsyncContinue | eBroadcastBitAsyncThreadShouldExit; 786 787 if (listener_sp->StartListeningForEvents(&process->m_async_broadcaster, 788 desired_event_mask) == 789 desired_event_mask) { 790 bool done = false; 791 while (!done) { 792 if (log) 793 log->Printf("ProcessKDP::AsyncThread (pid = %" PRIu64 794 ") listener.WaitForEvent (NULL, event_sp)...", 795 pid); 796 if (listener_sp->GetEvent(event_sp, llvm::None)) { 797 uint32_t event_type = event_sp->GetType(); 798 if (log) 799 log->Printf("ProcessKDP::AsyncThread (pid = %" PRIu64 800 ") Got an event of type: %d...", 801 pid, event_type); 802 803 // When we are running, poll for 1 second to try and get an exception 804 // to indicate the process has stopped. If we don't get one, check to 805 // make sure no one asked us to exit 806 bool is_running = false; 807 DataExtractor exc_reply_packet; 808 do { 809 switch (event_type) { 810 case eBroadcastBitAsyncContinue: { 811 is_running = true; 812 if (process->m_comm.WaitForPacketWithTimeoutMicroSeconds( 813 exc_reply_packet, 1 * USEC_PER_SEC)) { 814 ThreadSP thread_sp(process->GetKernelThread()); 815 if (thread_sp) { 816 lldb::RegisterContextSP reg_ctx_sp( 817 thread_sp->GetRegisterContext()); 818 if (reg_ctx_sp) 819 reg_ctx_sp->InvalidateAllRegisters(); 820 static_cast<ThreadKDP *>(thread_sp.get()) 821 ->SetStopInfoFrom_KDP_EXCEPTION(exc_reply_packet); 822 } 823 824 // TODO: parse the stop reply packet 825 is_running = false; 826 process->SetPrivateState(eStateStopped); 827 } else { 828 // Check to see if we are supposed to exit. There is no way to 829 // interrupt a running kernel, so all we can do is wait for an 830 // exception or detach... 831 if (listener_sp->GetEvent(event_sp, 832 std::chrono::microseconds(0))) { 833 // We got an event, go through the loop again 834 event_type = event_sp->GetType(); 835 } 836 } 837 } break; 838 839 case eBroadcastBitAsyncThreadShouldExit: 840 if (log) 841 log->Printf("ProcessKDP::AsyncThread (pid = %" PRIu64 842 ") got eBroadcastBitAsyncThreadShouldExit...", 843 pid); 844 done = true; 845 is_running = false; 846 break; 847 848 default: 849 if (log) 850 log->Printf("ProcessKDP::AsyncThread (pid = %" PRIu64 851 ") got unknown event 0x%8.8x", 852 pid, event_type); 853 done = true; 854 is_running = false; 855 break; 856 } 857 } while (is_running); 858 } else { 859 if (log) 860 log->Printf("ProcessKDP::AsyncThread (pid = %" PRIu64 861 ") listener.WaitForEvent (NULL, event_sp) => false", 862 pid); 863 done = true; 864 } 865 } 866 } 867 868 if (log) 869 log->Printf("ProcessKDP::AsyncThread (arg = %p, pid = %" PRIu64 870 ") thread exiting...", 871 arg, pid); 872 873 process->m_async_thread.Reset(); 874 return NULL; 875 } 876 877 class CommandObjectProcessKDPPacketSend : public CommandObjectParsed { 878 private: 879 OptionGroupOptions m_option_group; 880 OptionGroupUInt64 m_command_byte; 881 OptionGroupString m_packet_data; 882 883 virtual Options *GetOptions() { return &m_option_group; } 884 885 public: 886 CommandObjectProcessKDPPacketSend(CommandInterpreter &interpreter) 887 : CommandObjectParsed(interpreter, "process plugin packet send", 888 "Send a custom packet through the KDP protocol by " 889 "specifying the command byte and the packet " 890 "payload data. A packet will be sent with a " 891 "correct header and payload, and the raw result " 892 "bytes will be displayed as a string value. ", 893 NULL), 894 m_option_group(), 895 m_command_byte(LLDB_OPT_SET_1, true, "command", 'c', 0, eArgTypeNone, 896 "Specify the command byte to use when sending the KDP " 897 "request packet.", 898 0), 899 m_packet_data(LLDB_OPT_SET_1, false, "payload", 'p', 0, eArgTypeNone, 900 "Specify packet payload bytes as a hex ASCII string with " 901 "no spaces or hex prefixes.", 902 NULL) { 903 m_option_group.Append(&m_command_byte, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1); 904 m_option_group.Append(&m_packet_data, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1); 905 m_option_group.Finalize(); 906 } 907 908 ~CommandObjectProcessKDPPacketSend() {} 909 910 bool DoExecute(Args &command, CommandReturnObject &result) { 911 const size_t argc = command.GetArgumentCount(); 912 if (argc == 0) { 913 if (!m_command_byte.GetOptionValue().OptionWasSet()) { 914 result.AppendError( 915 "the --command option must be set to a valid command byte"); 916 result.SetStatus(eReturnStatusFailed); 917 } else { 918 const uint64_t command_byte = 919 m_command_byte.GetOptionValue().GetUInt64Value(0); 920 if (command_byte > 0 && command_byte <= UINT8_MAX) { 921 ProcessKDP *process = 922 (ProcessKDP *)m_interpreter.GetExecutionContext().GetProcessPtr(); 923 if (process) { 924 const StateType state = process->GetState(); 925 926 if (StateIsStoppedState(state, true)) { 927 std::vector<uint8_t> payload_bytes; 928 const char *ascii_hex_bytes_cstr = 929 m_packet_data.GetOptionValue().GetCurrentValue(); 930 if (ascii_hex_bytes_cstr && ascii_hex_bytes_cstr[0]) { 931 StringExtractor extractor(ascii_hex_bytes_cstr); 932 const size_t ascii_hex_bytes_cstr_len = 933 extractor.GetStringRef().size(); 934 if (ascii_hex_bytes_cstr_len & 1) { 935 result.AppendErrorWithFormat("payload data must contain an " 936 "even number of ASCII hex " 937 "characters: '%s'", 938 ascii_hex_bytes_cstr); 939 result.SetStatus(eReturnStatusFailed); 940 return false; 941 } 942 payload_bytes.resize(ascii_hex_bytes_cstr_len / 2); 943 if (extractor.GetHexBytes(payload_bytes, '\xdd') != 944 payload_bytes.size()) { 945 result.AppendErrorWithFormat("payload data must only contain " 946 "ASCII hex characters (no " 947 "spaces or hex prefixes): '%s'", 948 ascii_hex_bytes_cstr); 949 result.SetStatus(eReturnStatusFailed); 950 return false; 951 } 952 } 953 Error error; 954 DataExtractor reply; 955 process->GetCommunication().SendRawRequest( 956 command_byte, 957 payload_bytes.empty() ? NULL : payload_bytes.data(), 958 payload_bytes.size(), reply, error); 959 960 if (error.Success()) { 961 // Copy the binary bytes into a hex ASCII string for the result 962 StreamString packet; 963 packet.PutBytesAsRawHex8( 964 reply.GetDataStart(), reply.GetByteSize(), 965 endian::InlHostByteOrder(), endian::InlHostByteOrder()); 966 result.AppendMessage(packet.GetString()); 967 result.SetStatus(eReturnStatusSuccessFinishResult); 968 return true; 969 } else { 970 const char *error_cstr = error.AsCString(); 971 if (error_cstr && error_cstr[0]) 972 result.AppendError(error_cstr); 973 else 974 result.AppendErrorWithFormat("unknown error 0x%8.8x", 975 error.GetError()); 976 result.SetStatus(eReturnStatusFailed); 977 return false; 978 } 979 } else { 980 result.AppendErrorWithFormat("process must be stopped in order " 981 "to send KDP packets, state is %s", 982 StateAsCString(state)); 983 result.SetStatus(eReturnStatusFailed); 984 } 985 } else { 986 result.AppendError("invalid process"); 987 result.SetStatus(eReturnStatusFailed); 988 } 989 } else { 990 result.AppendErrorWithFormat("invalid command byte 0x%" PRIx64 991 ", valid values are 1 - 255", 992 command_byte); 993 result.SetStatus(eReturnStatusFailed); 994 } 995 } 996 } else { 997 result.AppendErrorWithFormat("'%s' takes no arguments, only options.", 998 m_cmd_name.c_str()); 999 result.SetStatus(eReturnStatusFailed); 1000 } 1001 return false; 1002 } 1003 }; 1004 1005 class CommandObjectProcessKDPPacket : public CommandObjectMultiword { 1006 private: 1007 public: 1008 CommandObjectProcessKDPPacket(CommandInterpreter &interpreter) 1009 : CommandObjectMultiword(interpreter, "process plugin packet", 1010 "Commands that deal with KDP remote packets.", 1011 NULL) { 1012 LoadSubCommand( 1013 "send", 1014 CommandObjectSP(new CommandObjectProcessKDPPacketSend(interpreter))); 1015 } 1016 1017 ~CommandObjectProcessKDPPacket() {} 1018 }; 1019 1020 class CommandObjectMultiwordProcessKDP : public CommandObjectMultiword { 1021 public: 1022 CommandObjectMultiwordProcessKDP(CommandInterpreter &interpreter) 1023 : CommandObjectMultiword( 1024 interpreter, "process plugin", 1025 "Commands for operating on a ProcessKDP process.", 1026 "process plugin <subcommand> [<subcommand-options>]") { 1027 LoadSubCommand("packet", CommandObjectSP(new CommandObjectProcessKDPPacket( 1028 interpreter))); 1029 } 1030 1031 ~CommandObjectMultiwordProcessKDP() {} 1032 }; 1033 1034 CommandObject *ProcessKDP::GetPluginCommandObject() { 1035 if (!m_command_sp) 1036 m_command_sp.reset(new CommandObjectMultiwordProcessKDP( 1037 GetTarget().GetDebugger().GetCommandInterpreter())); 1038 return m_command_sp.get(); 1039 } 1040