contrib/llvm/tools/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp

   1 //===-- PlatformRemoteGDBServer.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 #include "PlatformRemoteGDBServer.h"
  11 #include "lldb/Host/Config.h"
  12
  13 #include "lldb/Breakpoint/BreakpointLocation.h"
  14 #include "lldb/Core/Debugger.h"
  15 #include "lldb/Core/Module.h"
  16 #include "lldb/Core/ModuleList.h"
  17 #include "lldb/Core/ModuleSpec.h"
  18 #include "lldb/Core/PluginManager.h"
  19 #include "lldb/Core/StreamFile.h"
  20 #include "lldb/Host/ConnectionFileDescriptor.h"
  21 #include "lldb/Host/Host.h"
  22 #include "lldb/Host/HostInfo.h"
  23 #include "lldb/Host/PosixApi.h"
  24 #include "lldb/Target/Process.h"
  25 #include "lldb/Target/Target.h"
  26 #include "lldb/Utility/FileSpec.h"
  27 #include "lldb/Utility/Log.h"
  28 #include "lldb/Utility/Status.h"
  29 #include "lldb/Utility/StreamString.h"
  30 #include "lldb/Utility/UriParser.h"
  31
  32 #include "Plugins/Process/Utility/GDBRemoteSignals.h"
  33
  34 using namespace lldb;
  35 using namespace lldb_private;
  36 using namespace lldb_private::platform_gdb_server;
  37
  38 static bool g_initialized = false;
  39
  40 void PlatformRemoteGDBServer::Initialize() {
  41   Platform::Initialize();
  42
  43   if (!g_initialized) {
  44     g_initialized = true;
  45     PluginManager::RegisterPlugin(
  46         PlatformRemoteGDBServer::GetPluginNameStatic(),
  47         PlatformRemoteGDBServer::GetDescriptionStatic(),
  48         PlatformRemoteGDBServer::CreateInstance);
  49   }
  50 }
  51
  52 void PlatformRemoteGDBServer::Terminate() {
  53   if (g_initialized) {
  54     g_initialized = false;
  55     PluginManager::UnregisterPlugin(PlatformRemoteGDBServer::CreateInstance);
  56   }
  57
  58   Platform::Terminate();
  59 }
  60
  61 PlatformSP PlatformRemoteGDBServer::CreateInstance(bool force,
  62                                                    const ArchSpec *arch) {
  63   bool create = force;
  64   if (!create) {
  65     create = !arch->TripleVendorWasSpecified() && !arch->TripleOSWasSpecified();
  66   }
  67   if (create)
  68     return PlatformSP(new PlatformRemoteGDBServer());
  69   return PlatformSP();
  70 }
  71
  72 ConstString PlatformRemoteGDBServer::GetPluginNameStatic() {
  73   static ConstString g_name("remote-gdb-server");
  74   return g_name;
  75 }
  76
  77 const char *PlatformRemoteGDBServer::GetDescriptionStatic() {
  78   return "A platform that uses the GDB remote protocol as the communication "
  79          "transport.";
  80 }
  81
  82 const char *PlatformRemoteGDBServer::GetDescription() {
  83   if (m_platform_description.empty()) {
  84     if (IsConnected()) {
  85       // Send the get description packet
  86     }
  87   }
  88
  89   if (!m_platform_description.empty())
  90     return m_platform_description.c_str();
  91   return GetDescriptionStatic();
  92 }
  93
  94 Status PlatformRemoteGDBServer::ResolveExecutable(
  95     const ModuleSpec &module_spec, lldb::ModuleSP &exe_module_sp,
  96     const FileSpecList *module_search_paths_ptr) {
  97   // copied from PlatformRemoteiOS
  98
  99   Status error;
 100   // Nothing special to do here, just use the actual file and architecture
 101
 102   ModuleSpec resolved_module_spec(module_spec);
 103
 104   // Resolve any executable within an apk on Android?
 105   // Host::ResolveExecutableInBundle (resolved_module_spec.GetFileSpec());
 106
 107   if (FileSystem::Instance().Exists(resolved_module_spec.GetFileSpec()) ||
 108       module_spec.GetUUID().IsValid()) {
 109     if (resolved_module_spec.GetArchitecture().IsValid() ||
 110         resolved_module_spec.GetUUID().IsValid()) {
 111       error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
 112                                           module_search_paths_ptr, NULL, NULL);
 113
 114       if (exe_module_sp && exe_module_sp->GetObjectFile())
 115         return error;
 116       exe_module_sp.reset();
 117     }
 118     // No valid architecture was specified or the exact arch wasn't found so
 119     // ask the platform for the architectures that we should be using (in the
 120     // correct order) and see if we can find a match that way
 121     StreamString arch_names;
 122     for (uint32_t idx = 0; GetSupportedArchitectureAtIndex(
 123              idx, resolved_module_spec.GetArchitecture());
 124          ++idx) {
 125       error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
 126                                           module_search_paths_ptr, NULL, NULL);
 127       // Did we find an executable using one of the
 128       if (error.Success()) {
 129         if (exe_module_sp && exe_module_sp->GetObjectFile())
 130           break;
 131         else
 132           error.SetErrorToGenericError();
 133       }
 134
 135       if (idx > 0)
 136         arch_names.PutCString(", ");
 137       arch_names.PutCString(
 138           resolved_module_spec.GetArchitecture().GetArchitectureName());
 139     }
 140
 141     if (error.Fail() || !exe_module_sp) {
 142       if (FileSystem::Instance().Readable(resolved_module_spec.GetFileSpec())) {
 143         error.SetErrorStringWithFormat(
 144             "'%s' doesn't contain any '%s' platform architectures: %s",
 145             resolved_module_spec.GetFileSpec().GetPath().c_str(),
 146             GetPluginName().GetCString(), arch_names.GetData());
 147       } else {
 148         error.SetErrorStringWithFormat(
 149             "'%s' is not readable",
 150             resolved_module_spec.GetFileSpec().GetPath().c_str());
 151       }
 152     }
 153   } else {
 154     error.SetErrorStringWithFormat(
 155         "'%s' does not exist",
 156         resolved_module_spec.GetFileSpec().GetPath().c_str());
 157   }
 158
 159   return error;
 160 }
 161
 162 bool PlatformRemoteGDBServer::GetModuleSpec(const FileSpec &module_file_spec,
 163                                             const ArchSpec &arch,
 164                                             ModuleSpec &module_spec) {
 165   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 166
 167   const auto module_path = module_file_spec.GetPath(false);
 168
 169   if (!m_gdb_client.GetModuleInfo(module_file_spec, arch, module_spec)) {
 170     if (log)
 171       log->Printf(
 172           "PlatformRemoteGDBServer::%s - failed to get module info for %s:%s",
 173           __FUNCTION__, module_path.c_str(),
 174           arch.GetTriple().getTriple().c_str());
 175     return false;
 176   }
 177
 178   if (log) {
 179     StreamString stream;
 180     module_spec.Dump(stream);
 181     log->Printf(
 182         "PlatformRemoteGDBServer::%s - got module info for (%s:%s) : %s",
 183         __FUNCTION__, module_path.c_str(), arch.GetTriple().getTriple().c_str(),
 184         stream.GetData());
 185   }
 186
 187   return true;
 188 }
 189
 190 Status PlatformRemoteGDBServer::GetFileWithUUID(const FileSpec &platform_file,
 191                                                 const UUID *uuid_ptr,
 192                                                 FileSpec &local_file) {
 193   // Default to the local case
 194   local_file = platform_file;
 195   return Status();
 196 }
 197
 198 //------------------------------------------------------------------
 199 /// Default Constructor
 200 //------------------------------------------------------------------
 201 PlatformRemoteGDBServer::PlatformRemoteGDBServer()
 202     : Platform(false), // This is a remote platform
 203       m_gdb_client() {}
 204
 205 //------------------------------------------------------------------
 206 /// Destructor.
 207 ///
 208 /// The destructor is virtual since this class is designed to be
 209 /// inherited from by the plug-in instance.
 210 //------------------------------------------------------------------
 211 PlatformRemoteGDBServer::~PlatformRemoteGDBServer() {}
 212
 213 bool PlatformRemoteGDBServer::GetSupportedArchitectureAtIndex(uint32_t idx,
 214                                                               ArchSpec &arch) {
 215   ArchSpec remote_arch = m_gdb_client.GetSystemArchitecture();
 216
 217   if (idx == 0) {
 218     arch = remote_arch;
 219     return arch.IsValid();
 220   } else if (idx == 1 && remote_arch.IsValid() &&
 221              remote_arch.GetTriple().isArch64Bit()) {
 222     arch.SetTriple(remote_arch.GetTriple().get32BitArchVariant());
 223     return arch.IsValid();
 224   }
 225   return false;
 226 }
 227
 228 size_t PlatformRemoteGDBServer::GetSoftwareBreakpointTrapOpcode(
 229     Target &target, BreakpointSite *bp_site) {
 230   // This isn't needed if the z/Z packets are supported in the GDB remote
 231   // server. But we might need a packet to detect this.
 232   return 0;
 233 }
 234
 235 bool PlatformRemoteGDBServer::GetRemoteOSVersion() {
 236   m_os_version = m_gdb_client.GetOSVersion();
 237   return !m_os_version.empty();
 238 }
 239
 240 bool PlatformRemoteGDBServer::GetRemoteOSBuildString(std::string &s) {
 241   return m_gdb_client.GetOSBuildString(s);
 242 }
 243
 244 bool PlatformRemoteGDBServer::GetRemoteOSKernelDescription(std::string &s) {
 245   return m_gdb_client.GetOSKernelDescription(s);
 246 }
 247
 248 // Remote Platform subclasses need to override this function
 249 ArchSpec PlatformRemoteGDBServer::GetRemoteSystemArchitecture() {
 250   return m_gdb_client.GetSystemArchitecture();
 251 }
 252
 253 FileSpec PlatformRemoteGDBServer::GetRemoteWorkingDirectory() {
 254   if (IsConnected()) {
 255     Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 256     FileSpec working_dir;
 257     if (m_gdb_client.GetWorkingDir(working_dir) && log)
 258       log->Printf(
 259           "PlatformRemoteGDBServer::GetRemoteWorkingDirectory() -> '%s'",
 260           working_dir.GetCString());
 261     return working_dir;
 262   } else {
 263     return Platform::GetRemoteWorkingDirectory();
 264   }
 265 }
 266
 267 bool PlatformRemoteGDBServer::SetRemoteWorkingDirectory(
 268     const FileSpec &working_dir) {
 269   if (IsConnected()) {
 270     // Clear the working directory it case it doesn't get set correctly. This
 271     // will for use to re-read it
 272     Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 273     if (log)
 274       log->Printf("PlatformRemoteGDBServer::SetRemoteWorkingDirectory('%s')",
 275                   working_dir.GetCString());
 276     return m_gdb_client.SetWorkingDir(working_dir) == 0;
 277   } else
 278     return Platform::SetRemoteWorkingDirectory(working_dir);
 279 }
 280
 281 bool PlatformRemoteGDBServer::IsConnected() const {
 282   return m_gdb_client.IsConnected();
 283 }
 284
 285 Status PlatformRemoteGDBServer::ConnectRemote(Args &args) {
 286   Status error;
 287   if (IsConnected()) {
 288     error.SetErrorStringWithFormat("the platform is already connected to '%s', "
 289                                    "execute 'platform disconnect' to close the "
 290                                    "current connection",
 291                                    GetHostname());
 292   } else {
 293     if (args.GetArgumentCount() == 1) {
 294       m_gdb_client.SetConnection(new ConnectionFileDescriptor());
 295       // we're going to reuse the hostname when we connect to the debugserver
 296       int port;
 297       std::string path;
 298       const char *url = args.GetArgumentAtIndex(0);
 299       if (!url)
 300         return Status("URL is null.");
 301       llvm::StringRef scheme, hostname, pathname;
 302       if (!UriParser::Parse(url, scheme, hostname, port, pathname))
 303         return Status("Invalid URL: %s", url);
 304       m_platform_scheme = scheme;
 305       m_platform_hostname = hostname;
 306       path = pathname;
 307
 308       const ConnectionStatus status = m_gdb_client.Connect(url, &error);
 309       if (status == eConnectionStatusSuccess) {
 310         if (m_gdb_client.HandshakeWithServer(&error)) {
 311           m_gdb_client.GetHostInfo();
 312           // If a working directory was set prior to connecting, send it down
 313           // now
 314           if (m_working_dir)
 315             m_gdb_client.SetWorkingDir(m_working_dir);
 316         } else {
 317           m_gdb_client.Disconnect();
 318           if (error.Success())
 319             error.SetErrorString("handshake failed");
 320         }
 321       }
 322     } else {
 323       error.SetErrorString(
 324           "\"platform connect\" takes a single argument: <connect-url>");
 325     }
 326   }
 327   return error;
 328 }
 329
 330 Status PlatformRemoteGDBServer::DisconnectRemote() {
 331   Status error;
 332   m_gdb_client.Disconnect(&error);
 333   m_remote_signals_sp.reset();
 334   return error;
 335 }
 336
 337 const char *PlatformRemoteGDBServer::GetHostname() {
 338   m_gdb_client.GetHostname(m_name);
 339   if (m_name.empty())
 340     return NULL;
 341   return m_name.c_str();
 342 }
 343
 344 const char *PlatformRemoteGDBServer::GetUserName(uint32_t uid) {
 345   // Try and get a cache user name first
 346   const char *cached_user_name = Platform::GetUserName(uid);
 347   if (cached_user_name)
 348     return cached_user_name;
 349   std::string name;
 350   if (m_gdb_client.GetUserName(uid, name))
 351     return SetCachedUserName(uid, name.c_str(), name.size());
 352
 353   SetUserNameNotFound(uid); // Negative cache so we don't keep sending packets
 354   return NULL;
 355 }
 356
 357 const char *PlatformRemoteGDBServer::GetGroupName(uint32_t gid) {
 358   const char *cached_group_name = Platform::GetGroupName(gid);
 359   if (cached_group_name)
 360     return cached_group_name;
 361   std::string name;
 362   if (m_gdb_client.GetGroupName(gid, name))
 363     return SetCachedGroupName(gid, name.c_str(), name.size());
 364
 365   SetGroupNameNotFound(gid); // Negative cache so we don't keep sending packets
 366   return NULL;
 367 }
 368
 369 uint32_t PlatformRemoteGDBServer::FindProcesses(
 370     const ProcessInstanceInfoMatch &match_info,
 371     ProcessInstanceInfoList &process_infos) {
 372   return m_gdb_client.FindProcesses(match_info, process_infos);
 373 }
 374
 375 bool PlatformRemoteGDBServer::GetProcessInfo(
 376     lldb::pid_t pid, ProcessInstanceInfo &process_info) {
 377   return m_gdb_client.GetProcessInfo(pid, process_info);
 378 }
 379
 380 Status PlatformRemoteGDBServer::LaunchProcess(ProcessLaunchInfo &launch_info) {
 381   Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
 382   Status error;
 383
 384   if (log)
 385     log->Printf("PlatformRemoteGDBServer::%s() called", __FUNCTION__);
 386
 387   auto num_file_actions = launch_info.GetNumFileActions();
 388   for (decltype(num_file_actions) i = 0; i < num_file_actions; ++i) {
 389     const auto file_action = launch_info.GetFileActionAtIndex(i);
 390     if (file_action->GetAction() != FileAction::eFileActionOpen)
 391       continue;
 392     switch (file_action->GetFD()) {
 393     case STDIN_FILENO:
 394       m_gdb_client.SetSTDIN(file_action->GetFileSpec());
 395       break;
 396     case STDOUT_FILENO:
 397       m_gdb_client.SetSTDOUT(file_action->GetFileSpec());
 398       break;
 399     case STDERR_FILENO:
 400       m_gdb_client.SetSTDERR(file_action->GetFileSpec());
 401       break;
 402     }
 403   }
 404
 405   m_gdb_client.SetDisableASLR(
 406       launch_info.GetFlags().Test(eLaunchFlagDisableASLR));
 407   m_gdb_client.SetDetachOnError(
 408       launch_info.GetFlags().Test(eLaunchFlagDetachOnError));
 409
 410   FileSpec working_dir = launch_info.GetWorkingDirectory();
 411   if (working_dir) {
 412     m_gdb_client.SetWorkingDir(working_dir);
 413   }
 414
 415   // Send the environment and the program + arguments after we connect
 416   m_gdb_client.SendEnvironment(launch_info.GetEnvironment());
 417
 418   ArchSpec arch_spec = launch_info.GetArchitecture();
 419   const char *arch_triple = arch_spec.GetTriple().str().c_str();
 420
 421   m_gdb_client.SendLaunchArchPacket(arch_triple);
 422   if (log)
 423     log->Printf(
 424         "PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'",
 425         __FUNCTION__, arch_triple ? arch_triple : "<NULL>");
 426
 427   int arg_packet_err;
 428   {
 429     // Scope for the scoped timeout object
 430     process_gdb_remote::GDBRemoteCommunication::ScopedTimeout timeout(
 431         m_gdb_client, std::chrono::seconds(5));
 432     arg_packet_err = m_gdb_client.SendArgumentsPacket(launch_info);
 433   }
 434
 435   if (arg_packet_err == 0) {
 436     std::string error_str;
 437     if (m_gdb_client.GetLaunchSuccess(error_str)) {
 438       const auto pid = m_gdb_client.GetCurrentProcessID(false);
 439       if (pid != LLDB_INVALID_PROCESS_ID) {
 440         launch_info.SetProcessID(pid);
 441         if (log)
 442           log->Printf("PlatformRemoteGDBServer::%s() pid %" PRIu64
 443                       " launched successfully",
 444                       __FUNCTION__, pid);
 445       } else {
 446         if (log)
 447           log->Printf("PlatformRemoteGDBServer::%s() launch succeeded but we "
 448                       "didn't get a valid process id back!",
 449                       __FUNCTION__);
 450         error.SetErrorString("failed to get PID");
 451       }
 452     } else {
 453       error.SetErrorString(error_str.c_str());
 454       if (log)
 455         log->Printf("PlatformRemoteGDBServer::%s() launch failed: %s",
 456                     __FUNCTION__, error.AsCString());
 457     }
 458   } else {
 459     error.SetErrorStringWithFormat("'A' packet returned an error: %i",
 460                                    arg_packet_err);
 461   }
 462   return error;
 463 }
 464
 465 Status PlatformRemoteGDBServer::KillProcess(const lldb::pid_t pid) {
 466   if (!KillSpawnedProcess(pid))
 467     return Status("failed to kill remote spawned process");
 468   return Status();
 469 }
 470
 471 lldb::ProcessSP PlatformRemoteGDBServer::DebugProcess(
 472     ProcessLaunchInfo &launch_info, Debugger &debugger,
 473     Target *target, // Can be NULL, if NULL create a new target, else use
 474                     // existing one
 475     Status &error) {
 476   lldb::ProcessSP process_sp;
 477   if (IsRemote()) {
 478     if (IsConnected()) {
 479       lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
 480       std::string connect_url;
 481       if (!LaunchGDBServer(debugserver_pid, connect_url)) {
 482         error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
 483                                        GetHostname());
 484       } else {
 485         if (target == NULL) {
 486           TargetSP new_target_sp;
 487
 488           error = debugger.GetTargetList().CreateTarget(
 489               debugger, "", "", eLoadDependentsNo, NULL, new_target_sp);
 490           target = new_target_sp.get();
 491         } else
 492           error.Clear();
 493
 494         if (target && error.Success()) {
 495           debugger.GetTargetList().SetSelectedTarget(target);
 496
 497           // The darwin always currently uses the GDB remote debugger plug-in
 498           // so even when debugging locally we are debugging remotely!
 499           process_sp = target->CreateProcess(launch_info.GetListener(),
 500                                              "gdb-remote", NULL);
 501
 502           if (process_sp) {
 503             error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 504             // Retry the connect remote one time...
 505             if (error.Fail())
 506               error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 507             if (error.Success())
 508               error = process_sp->Launch(launch_info);
 509             else if (debugserver_pid != LLDB_INVALID_PROCESS_ID) {
 510               printf("error: connect remote failed (%s)\n", error.AsCString());
 511               KillSpawnedProcess(debugserver_pid);
 512             }
 513           }
 514         }
 515       }
 516     } else {
 517       error.SetErrorString("not connected to remote gdb server");
 518     }
 519   }
 520   return process_sp;
 521 }
 522
 523 bool PlatformRemoteGDBServer::LaunchGDBServer(lldb::pid_t &pid,
 524                                               std::string &connect_url) {
 525   ArchSpec remote_arch = GetRemoteSystemArchitecture();
 526   llvm::Triple &remote_triple = remote_arch.GetTriple();
 527
 528   uint16_t port = 0;
 529   std::string socket_name;
 530   bool launch_result = false;
 531   if (remote_triple.getVendor() == llvm::Triple::Apple &&
 532       remote_triple.getOS() == llvm::Triple::IOS) {
 533     // When remote debugging to iOS, we use a USB mux that always talks to
 534     // localhost, so we will need the remote debugserver to accept connections
 535     // only from localhost, no matter what our current hostname is
 536     launch_result =
 537         m_gdb_client.LaunchGDBServer("127.0.0.1", pid, port, socket_name);
 538   } else {
 539     // All other hosts should use their actual hostname
 540     launch_result =
 541         m_gdb_client.LaunchGDBServer(nullptr, pid, port, socket_name);
 542   }
 543
 544   if (!launch_result)
 545     return false;
 546
 547   connect_url =
 548       MakeGdbServerUrl(m_platform_scheme, m_platform_hostname, port,
 549                        (socket_name.empty()) ? nullptr : socket_name.c_str());
 550   return true;
 551 }
 552
 553 bool PlatformRemoteGDBServer::KillSpawnedProcess(lldb::pid_t pid) {
 554   return m_gdb_client.KillSpawnedProcess(pid);
 555 }
 556
 557 lldb::ProcessSP PlatformRemoteGDBServer::Attach(
 558     ProcessAttachInfo &attach_info, Debugger &debugger,
 559     Target *target, // Can be NULL, if NULL create a new target, else use
 560                     // existing one
 561     Status &error) {
 562   lldb::ProcessSP process_sp;
 563   if (IsRemote()) {
 564     if (IsConnected()) {
 565       lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
 566       std::string connect_url;
 567       if (!LaunchGDBServer(debugserver_pid, connect_url)) {
 568         error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
 569                                        GetHostname());
 570       } else {
 571         if (target == NULL) {
 572           TargetSP new_target_sp;
 573
 574           error = debugger.GetTargetList().CreateTarget(
 575               debugger, "", "", eLoadDependentsNo, NULL, new_target_sp);
 576           target = new_target_sp.get();
 577         } else
 578           error.Clear();
 579
 580         if (target && error.Success()) {
 581           debugger.GetTargetList().SetSelectedTarget(target);
 582
 583           // The darwin always currently uses the GDB remote debugger plug-in
 584           // so even when debugging locally we are debugging remotely!
 585           process_sp = target->CreateProcess(
 586               attach_info.GetListenerForProcess(debugger), "gdb-remote", NULL);
 587           if (process_sp) {
 588             error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 589             if (error.Success()) {
 590               ListenerSP listener_sp = attach_info.GetHijackListener();
 591               if (listener_sp)
 592                 process_sp->HijackProcessEvents(listener_sp);
 593               error = process_sp->Attach(attach_info);
 594             }
 595
 596             if (error.Fail() && debugserver_pid != LLDB_INVALID_PROCESS_ID) {
 597               KillSpawnedProcess(debugserver_pid);
 598             }
 599           }
 600         }
 601       }
 602     } else {
 603       error.SetErrorString("not connected to remote gdb server");
 604     }
 605   }
 606   return process_sp;
 607 }
 608
 609 Status PlatformRemoteGDBServer::MakeDirectory(const FileSpec &file_spec,
 610                                               uint32_t mode) {
 611   Status error = m_gdb_client.MakeDirectory(file_spec, mode);
 612   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 613   if (log)
 614     log->Printf("PlatformRemoteGDBServer::MakeDirectory(path='%s', mode=%o) "
 615                 "error = %u (%s)",
 616                 file_spec.GetCString(), mode, error.GetError(),
 617                 error.AsCString());
 618   return error;
 619 }
 620
 621 Status PlatformRemoteGDBServer::GetFilePermissions(const FileSpec &file_spec,
 622                                                    uint32_t &file_permissions) {
 623   Status error = m_gdb_client.GetFilePermissions(file_spec, file_permissions);
 624   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 625   if (log)
 626     log->Printf("PlatformRemoteGDBServer::GetFilePermissions(path='%s', "
 627                 "file_permissions=%o) error = %u (%s)",
 628                 file_spec.GetCString(), file_permissions, error.GetError(),
 629                 error.AsCString());
 630   return error;
 631 }
 632
 633 Status PlatformRemoteGDBServer::SetFilePermissions(const FileSpec &file_spec,
 634                                                    uint32_t file_permissions) {
 635   Status error = m_gdb_client.SetFilePermissions(file_spec, file_permissions);
 636   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 637   if (log)
 638     log->Printf("PlatformRemoteGDBServer::SetFilePermissions(path='%s', "
 639                 "file_permissions=%o) error = %u (%s)",
 640                 file_spec.GetCString(), file_permissions, error.GetError(),
 641                 error.AsCString());
 642   return error;
 643 }
 644
 645 lldb::user_id_t PlatformRemoteGDBServer::OpenFile(const FileSpec &file_spec,
 646                                                   uint32_t flags, uint32_t mode,
 647                                                   Status &error) {
 648   return m_gdb_client.OpenFile(file_spec, flags, mode, error);
 649 }
 650
 651 bool PlatformRemoteGDBServer::CloseFile(lldb::user_id_t fd, Status &error) {
 652   return m_gdb_client.CloseFile(fd, error);
 653 }
 654
 655 lldb::user_id_t
 656 PlatformRemoteGDBServer::GetFileSize(const FileSpec &file_spec) {
 657   return m_gdb_client.GetFileSize(file_spec);
 658 }
 659
 660 uint64_t PlatformRemoteGDBServer::ReadFile(lldb::user_id_t fd, uint64_t offset,
 661                                            void *dst, uint64_t dst_len,
 662                                            Status &error) {
 663   return m_gdb_client.ReadFile(fd, offset, dst, dst_len, error);
 664 }
 665
 666 uint64_t PlatformRemoteGDBServer::WriteFile(lldb::user_id_t fd, uint64_t offset,
 667                                             const void *src, uint64_t src_len,
 668                                             Status &error) {
 669   return m_gdb_client.WriteFile(fd, offset, src, src_len, error);
 670 }
 671
 672 Status PlatformRemoteGDBServer::PutFile(const FileSpec &source,
 673                                         const FileSpec &destination,
 674                                         uint32_t uid, uint32_t gid) {
 675   return Platform::PutFile(source, destination, uid, gid);
 676 }
 677
 678 Status PlatformRemoteGDBServer::CreateSymlink(
 679     const FileSpec &src, // The name of the link is in src
 680     const FileSpec &dst) // The symlink points to dst
 681 {
 682   Status error = m_gdb_client.CreateSymlink(src, dst);
 683   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 684   if (log)
 685     log->Printf("PlatformRemoteGDBServer::CreateSymlink(src='%s', dst='%s') "
 686                 "error = %u (%s)",
 687                 src.GetCString(), dst.GetCString(), error.GetError(),
 688                 error.AsCString());
 689   return error;
 690 }
 691
 692 Status PlatformRemoteGDBServer::Unlink(const FileSpec &file_spec) {
 693   Status error = m_gdb_client.Unlink(file_spec);
 694   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 695   if (log)
 696     log->Printf("PlatformRemoteGDBServer::Unlink(path='%s') error = %u (%s)",
 697                 file_spec.GetCString(), error.GetError(), error.AsCString());
 698   return error;
 699 }
 700
 701 bool PlatformRemoteGDBServer::GetFileExists(const FileSpec &file_spec) {
 702   return m_gdb_client.GetFileExists(file_spec);
 703 }
 704
 705 Status PlatformRemoteGDBServer::RunShellCommand(
 706     const char *command, // Shouldn't be NULL
 707     const FileSpec &
 708         working_dir, // Pass empty FileSpec to use the current working directory
 709     int *status_ptr, // Pass NULL if you don't want the process exit status
 710     int *signo_ptr,  // Pass NULL if you don't want the signal that caused the
 711                      // process to exit
 712     std::string
 713         *command_output, // Pass NULL if you don't want the command output
 714     const Timeout<std::micro> &timeout) {
 715   return m_gdb_client.RunShellCommand(command, working_dir, status_ptr,
 716                                       signo_ptr, command_output, timeout);
 717 }
 718
 719 void PlatformRemoteGDBServer::CalculateTrapHandlerSymbolNames() {
 720   m_trap_handlers.push_back(ConstString("_sigtramp"));
 721 }
 722
 723 const UnixSignalsSP &PlatformRemoteGDBServer::GetRemoteUnixSignals() {
 724   if (!IsConnected())
 725     return Platform::GetRemoteUnixSignals();
 726
 727   if (m_remote_signals_sp)
 728     return m_remote_signals_sp;
 729
 730   // If packet not implemented or JSON failed to parse, we'll guess the signal
 731   // set based on the remote architecture.
 732   m_remote_signals_sp = UnixSignals::Create(GetRemoteSystemArchitecture());
 733
 734   StringExtractorGDBRemote response;
 735   auto result = m_gdb_client.SendPacketAndWaitForResponse("jSignalsInfo",
 736                                                           response, false);
 737
 738   if (result != decltype(result)::Success ||
 739       response.GetResponseType() != response.eResponse)
 740     return m_remote_signals_sp;
 741
 742   auto object_sp = StructuredData::ParseJSON(response.GetStringRef());
 743   if (!object_sp || !object_sp->IsValid())
 744     return m_remote_signals_sp;
 745
 746   auto array_sp = object_sp->GetAsArray();
 747   if (!array_sp || !array_sp->IsValid())
 748     return m_remote_signals_sp;
 749
 750   auto remote_signals_sp = std::make_shared<lldb_private::GDBRemoteSignals>();
 751
 752   bool done = array_sp->ForEach(
 753       [&remote_signals_sp](StructuredData::Object *object) -> bool {
 754         if (!object || !object->IsValid())
 755           return false;
 756
 757         auto dict = object->GetAsDictionary();
 758         if (!dict || !dict->IsValid())
 759           return false;
 760
 761         // Signal number and signal name are required.
 762         int signo;
 763         if (!dict->GetValueForKeyAsInteger("signo", signo))
 764           return false;
 765
 766         llvm::StringRef name;
 767         if (!dict->GetValueForKeyAsString("name", name))
 768           return false;
 769
 770         // We can live without short_name, description, etc.
 771         bool suppress{false};
 772         auto object_sp = dict->GetValueForKey("suppress");
 773         if (object_sp && object_sp->IsValid())
 774           suppress = object_sp->GetBooleanValue();
 775
 776         bool stop{false};
 777         object_sp = dict->GetValueForKey("stop");
 778         if (object_sp && object_sp->IsValid())
 779           stop = object_sp->GetBooleanValue();
 780
 781         bool notify{false};
 782         object_sp = dict->GetValueForKey("notify");
 783         if (object_sp && object_sp->IsValid())
 784           notify = object_sp->GetBooleanValue();
 785
 786         std::string description{""};
 787         object_sp = dict->GetValueForKey("description");
 788         if (object_sp && object_sp->IsValid())
 789           description = object_sp->GetStringValue();
 790
 791         remote_signals_sp->AddSignal(signo, name.str().c_str(), suppress, stop,
 792                                      notify, description.c_str());
 793         return true;
 794       });
 795
 796   if (done)
 797     m_remote_signals_sp = std::move(remote_signals_sp);
 798
 799   return m_remote_signals_sp;
 800 }
 801
 802 std::string PlatformRemoteGDBServer::MakeGdbServerUrl(
 803     const std::string &platform_scheme, const std::string &platform_hostname,
 804     uint16_t port, const char *socket_name) {
 805   const char *override_scheme =
 806       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_SCHEME");
 807   const char *override_hostname =
 808       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_HOSTNAME");
 809   const char *port_offset_c_str =
 810       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_PORT_OFFSET");
 811   int port_offset = port_offset_c_str ? ::atoi(port_offset_c_str) : 0;
 812
 813   return MakeUrl(override_scheme ? override_scheme : platform_scheme.c_str(),
 814                  override_hostname ? override_hostname
 815                                    : platform_hostname.c_str(),
 816                  port + port_offset, socket_name);
 817 }
 818
 819 std::string PlatformRemoteGDBServer::MakeUrl(const char *scheme,
 820                                              const char *hostname,
 821                                              uint16_t port, const char *path) {
 822   StreamString result;
 823   result.Printf("%s://%s", scheme, hostname);
 824   if (port != 0)
 825     result.Printf(":%u", port);
 826   if (path)
 827     result.Write(path, strlen(path));
 828   return result.GetString();
 829 }
 830
 831 lldb::ProcessSP PlatformRemoteGDBServer::ConnectProcess(
 832     llvm::StringRef connect_url, llvm::StringRef plugin_name,
 833     lldb_private::Debugger &debugger, lldb_private::Target *target,
 834     lldb_private::Status &error) {
 835   if (!IsRemote() || !IsConnected()) {
 836     error.SetErrorString("Not connected to remote gdb server");
 837     return nullptr;
 838   }
 839   return Platform::ConnectProcess(connect_url, plugin_name, debugger, target,
 840                                   error);
 841 }
 842
 843 size_t PlatformRemoteGDBServer::ConnectToWaitingProcesses(Debugger &debugger,
 844                                                           Status &error) {
 845   std::vector<std::string> connection_urls;
 846   GetPendingGdbServerList(connection_urls);
 847
 848   for (size_t i = 0; i < connection_urls.size(); ++i) {
 849     ConnectProcess(connection_urls[i].c_str(), "", debugger, nullptr, error);
 850     if (error.Fail())
 851       return i; // We already connected to i process succsessfully
 852   }
 853   return connection_urls.size();
 854 }
 855
 856 size_t PlatformRemoteGDBServer::GetPendingGdbServerList(
 857     std::vector<std::string> &connection_urls) {
 858   std::vector<std::pair<uint16_t, std::string>> remote_servers;
 859   m_gdb_client.QueryGDBServer(remote_servers);
 860   for (const auto &gdbserver : remote_servers) {
 861     const char *socket_name_cstr =
 862         gdbserver.second.empty() ? nullptr : gdbserver.second.c_str();
 863     connection_urls.emplace_back(
 864         MakeGdbServerUrl(m_platform_scheme, m_platform_hostname,
 865                          gdbserver.first, socket_name_cstr));
 866   }
 867   return connection_urls.size();
 868 }