1 //===-- PlatformLinux.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 "lldb/lldb-python.h" 11 12 #include "PlatformLinux.h" 13 #include "lldb/Host/Config.h" 14 15 // C Includes 16 #include <stdio.h> 17 #ifndef LLDB_DISABLE_POSIX 18 #include <sys/utsname.h> 19 #endif 20 21 // C++ Includes 22 // Other libraries and framework includes 23 // Project includes 24 #include "lldb/Breakpoint/BreakpointLocation.h" 25 #include "lldb/Core/Debugger.h" 26 #include "lldb/Core/Error.h" 27 #include "lldb/Core/Log.h" 28 #include "lldb/Core/Module.h" 29 #include "lldb/Core/ModuleList.h" 30 #include "lldb/Core/ModuleSpec.h" 31 #include "lldb/Core/PluginManager.h" 32 #include "lldb/Core/State.h" 33 #include "lldb/Core/StreamString.h" 34 #include "lldb/Host/FileSpec.h" 35 #include "lldb/Host/HostInfo.h" 36 #include "lldb/Interpreter/OptionValueProperties.h" 37 #include "lldb/Interpreter/Property.h" 38 #include "lldb/Target/Target.h" 39 #include "lldb/Target/Process.h" 40 41 #if defined(__linux__) 42 #include "../../Process/Linux/NativeProcessLinux.h" 43 #endif 44 45 // Define these constants from Linux mman.h for use when targetting 46 // remote linux systems even when host has different values. 47 #define MAP_PRIVATE 2 48 #define MAP_ANON 0x20 49 50 using namespace lldb; 51 using namespace lldb_private; 52 using namespace lldb_private::platform_linux; 53 54 static uint32_t g_initialize_count = 0; 55 56 //------------------------------------------------------------------ 57 /// Code to handle the PlatformLinux settings 58 //------------------------------------------------------------------ 59 60 namespace 61 { 62 enum 63 { 64 ePropertyUseLlgsForLocal = 0, 65 }; 66 67 class PlatformLinuxProperties : public Properties 68 { 69 public: 70 static ConstString& 71 GetSettingName (); 72 73 PlatformLinuxProperties(); 74 75 virtual 76 ~PlatformLinuxProperties() = default; 77 78 bool 79 GetUseLlgsForLocal() const; 80 81 private: 82 static const PropertyDefinition* 83 GetStaticPropertyDefinitions(); 84 }; 85 86 typedef std::shared_ptr<PlatformLinuxProperties> PlatformLinuxPropertiesSP; 87 88 } // anonymous namespace 89 90 PlatformLinuxProperties::PlatformLinuxProperties() : 91 Properties () 92 { 93 m_collection_sp.reset (new OptionValueProperties(GetSettingName ())); 94 m_collection_sp->Initialize (GetStaticPropertyDefinitions ()); 95 } 96 97 ConstString& 98 PlatformLinuxProperties::GetSettingName () 99 { 100 static ConstString g_setting_name("linux"); 101 return g_setting_name; 102 } 103 104 bool 105 PlatformLinuxProperties::GetUseLlgsForLocal() const 106 { 107 const uint32_t idx = ePropertyUseLlgsForLocal; 108 return m_collection_sp->GetPropertyAtIndexAsBoolean (NULL, idx, GetStaticPropertyDefinitions()[idx].default_uint_value != 0); 109 } 110 111 const PropertyDefinition* 112 PlatformLinuxProperties::GetStaticPropertyDefinitions() 113 { 114 static PropertyDefinition 115 g_properties[] = 116 { 117 { "use-llgs-for-local" , OptionValue::eTypeBoolean, true, true, NULL, NULL, "Control whether the platform uses llgs for local debug sessions." }, 118 { NULL , OptionValue::eTypeInvalid, false, 0 , NULL, NULL, NULL } 119 }; 120 121 // Allow environment variable to disable llgs-local. 122 if (getenv("PLATFORM_LINUX_DISABLE_LLGS_LOCAL")) 123 g_properties[ePropertyUseLlgsForLocal].default_uint_value = false; 124 125 return g_properties; 126 } 127 128 static const PlatformLinuxPropertiesSP & 129 GetGlobalProperties() 130 { 131 static PlatformLinuxPropertiesSP g_settings_sp; 132 if (!g_settings_sp) 133 g_settings_sp.reset (new PlatformLinuxProperties ()); 134 return g_settings_sp; 135 } 136 137 void 138 PlatformLinux::DebuggerInitialize (Debugger &debugger) 139 { 140 if (!PluginManager::GetSettingForPlatformPlugin (debugger, PlatformLinuxProperties::GetSettingName())) 141 { 142 const bool is_global_setting = true; 143 PluginManager::CreateSettingForPlatformPlugin (debugger, 144 GetGlobalProperties()->GetValueProperties(), 145 ConstString ("Properties for the PlatformLinux plug-in."), 146 is_global_setting); 147 } 148 } 149 150 151 //------------------------------------------------------------------ 152 153 PlatformSP 154 PlatformLinux::CreateInstance (bool force, const ArchSpec *arch) 155 { 156 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_PLATFORM)); 157 if (log) 158 { 159 const char *arch_name; 160 if (arch && arch->GetArchitectureName ()) 161 arch_name = arch->GetArchitectureName (); 162 else 163 arch_name = "<null>"; 164 165 const char *triple_cstr = arch ? arch->GetTriple ().getTriple ().c_str() : "<null>"; 166 167 log->Printf ("PlatformLinux::%s(force=%s, arch={%s,%s})", __FUNCTION__, force ? "true" : "false", arch_name, triple_cstr); 168 } 169 170 bool create = force; 171 if (create == false && arch && arch->IsValid()) 172 { 173 const llvm::Triple &triple = arch->GetTriple(); 174 switch (triple.getOS()) 175 { 176 case llvm::Triple::Linux: 177 create = true; 178 break; 179 180 #if defined(__linux__) 181 // Only accept "unknown" for the OS if the host is linux and 182 // it "unknown" wasn't specified (it was just returned because it 183 // was NOT specified) 184 case llvm::Triple::OSType::UnknownOS: 185 create = !arch->TripleOSWasSpecified(); 186 break; 187 #endif 188 default: 189 break; 190 } 191 } 192 193 if (create) 194 { 195 if (log) 196 log->Printf ("PlatformLinux::%s() creating remote-linux platform", __FUNCTION__); 197 return PlatformSP(new PlatformLinux(false)); 198 } 199 200 if (log) 201 log->Printf ("PlatformLinux::%s() aborting creation of remote-linux platform", __FUNCTION__); 202 203 return PlatformSP(); 204 } 205 206 207 ConstString 208 PlatformLinux::GetPluginNameStatic (bool is_host) 209 { 210 if (is_host) 211 { 212 static ConstString g_host_name(Platform::GetHostPlatformName ()); 213 return g_host_name; 214 } 215 else 216 { 217 static ConstString g_remote_name("remote-linux"); 218 return g_remote_name; 219 } 220 } 221 222 const char * 223 PlatformLinux::GetPluginDescriptionStatic (bool is_host) 224 { 225 if (is_host) 226 return "Local Linux user platform plug-in."; 227 else 228 return "Remote Linux user platform plug-in."; 229 } 230 231 ConstString 232 PlatformLinux::GetPluginName() 233 { 234 return GetPluginNameStatic(IsHost()); 235 } 236 237 void 238 PlatformLinux::Initialize () 239 { 240 PlatformPOSIX::Initialize (); 241 242 if (g_initialize_count++ == 0) 243 { 244 #if defined(__linux__) && !defined(__ANDROID__) 245 PlatformSP default_platform_sp (new PlatformLinux(true)); 246 default_platform_sp->SetSystemArchitecture(HostInfo::GetArchitecture()); 247 Platform::SetHostPlatform (default_platform_sp); 248 #endif 249 PluginManager::RegisterPlugin(PlatformLinux::GetPluginNameStatic(false), 250 PlatformLinux::GetPluginDescriptionStatic(false), 251 PlatformLinux::CreateInstance, 252 PlatformLinux::DebuggerInitialize); 253 } 254 } 255 256 void 257 PlatformLinux::Terminate () 258 { 259 if (g_initialize_count > 0) 260 { 261 if (--g_initialize_count == 0) 262 { 263 PluginManager::UnregisterPlugin (PlatformLinux::CreateInstance); 264 } 265 } 266 267 PlatformPOSIX::Terminate (); 268 } 269 270 Error 271 PlatformLinux::ResolveExecutable (const ModuleSpec &ms, 272 lldb::ModuleSP &exe_module_sp, 273 const FileSpecList *module_search_paths_ptr) 274 { 275 Error error; 276 // Nothing special to do here, just use the actual file and architecture 277 278 char exe_path[PATH_MAX]; 279 ModuleSpec resolved_module_spec (ms); 280 281 if (IsHost()) 282 { 283 // If we have "ls" as the exe_file, resolve the executable location based on 284 // the current path variables 285 if (!resolved_module_spec.GetFileSpec().Exists()) 286 { 287 resolved_module_spec.GetFileSpec().GetPath(exe_path, sizeof(exe_path)); 288 resolved_module_spec.GetFileSpec().SetFile(exe_path, true); 289 } 290 291 if (!resolved_module_spec.GetFileSpec().Exists()) 292 resolved_module_spec.GetFileSpec().ResolveExecutableLocation (); 293 294 if (resolved_module_spec.GetFileSpec().Exists()) 295 error.Clear(); 296 else 297 { 298 error.SetErrorStringWithFormat("unable to find executable for '%s'", resolved_module_spec.GetFileSpec().GetPath().c_str()); 299 } 300 } 301 else 302 { 303 if (m_remote_platform_sp) 304 { 305 error = GetCachedExecutable (resolved_module_spec, exe_module_sp, nullptr, *m_remote_platform_sp); 306 } 307 else 308 { 309 // We may connect to a process and use the provided executable (Don't use local $PATH). 310 311 if (resolved_module_spec.GetFileSpec().Exists()) 312 error.Clear(); 313 else 314 error.SetErrorStringWithFormat("the platform is not currently connected, and '%s' doesn't exist in the system root.", exe_path); 315 } 316 } 317 318 if (error.Success()) 319 { 320 if (resolved_module_spec.GetArchitecture().IsValid()) 321 { 322 error = ModuleList::GetSharedModule (resolved_module_spec, 323 exe_module_sp, 324 NULL, 325 NULL, 326 NULL); 327 if (error.Fail()) 328 { 329 // If we failed, it may be because the vendor and os aren't known. If that is the 330 // case, try setting them to the host architecture and give it another try. 331 llvm::Triple &module_triple = resolved_module_spec.GetArchitecture().GetTriple(); 332 bool is_vendor_specified = (module_triple.getVendor() != llvm::Triple::UnknownVendor); 333 bool is_os_specified = (module_triple.getOS() != llvm::Triple::UnknownOS); 334 if (!is_vendor_specified || !is_os_specified) 335 { 336 const llvm::Triple &host_triple = HostInfo::GetArchitecture(HostInfo::eArchKindDefault).GetTriple(); 337 338 if (!is_vendor_specified) 339 module_triple.setVendorName (host_triple.getVendorName()); 340 if (!is_os_specified) 341 module_triple.setOSName (host_triple.getOSName()); 342 343 error = ModuleList::GetSharedModule (resolved_module_spec, 344 exe_module_sp, 345 NULL, 346 NULL, 347 NULL); 348 } 349 } 350 351 // TODO find out why exe_module_sp might be NULL 352 if (!exe_module_sp || exe_module_sp->GetObjectFile() == NULL) 353 { 354 exe_module_sp.reset(); 355 error.SetErrorStringWithFormat ("'%s' doesn't contain the architecture %s", 356 resolved_module_spec.GetFileSpec().GetPath().c_str(), 357 resolved_module_spec.GetArchitecture().GetArchitectureName()); 358 } 359 } 360 else 361 { 362 // No valid architecture was specified, ask the platform for 363 // the architectures that we should be using (in the correct order) 364 // and see if we can find a match that way 365 StreamString arch_names; 366 for (uint32_t idx = 0; GetSupportedArchitectureAtIndex (idx, resolved_module_spec.GetArchitecture()); ++idx) 367 { 368 error = ModuleList::GetSharedModule (resolved_module_spec, 369 exe_module_sp, 370 NULL, 371 NULL, 372 NULL); 373 // Did we find an executable using one of the 374 if (error.Success()) 375 { 376 if (exe_module_sp && exe_module_sp->GetObjectFile()) 377 break; 378 else 379 error.SetErrorToGenericError(); 380 } 381 382 if (idx > 0) 383 arch_names.PutCString (", "); 384 arch_names.PutCString (resolved_module_spec.GetArchitecture().GetArchitectureName()); 385 } 386 387 if (error.Fail() || !exe_module_sp) 388 { 389 if (resolved_module_spec.GetFileSpec().Readable()) 390 { 391 error.SetErrorStringWithFormat ("'%s' doesn't contain any '%s' platform architectures: %s", 392 resolved_module_spec.GetFileSpec().GetPath().c_str(), 393 GetPluginName().GetCString(), 394 arch_names.GetString().c_str()); 395 } 396 else 397 { 398 error.SetErrorStringWithFormat("'%s' is not readable", resolved_module_spec.GetFileSpec().GetPath().c_str()); 399 } 400 } 401 } 402 } 403 404 return error; 405 } 406 407 Error 408 PlatformLinux::GetFileWithUUID (const FileSpec &platform_file, 409 const UUID *uuid_ptr, FileSpec &local_file) 410 { 411 if (IsRemote()) 412 { 413 if (m_remote_platform_sp) 414 return m_remote_platform_sp->GetFileWithUUID (platform_file, uuid_ptr, local_file); 415 } 416 417 // Default to the local case 418 local_file = platform_file; 419 return Error(); 420 } 421 422 423 //------------------------------------------------------------------ 424 /// Default Constructor 425 //------------------------------------------------------------------ 426 PlatformLinux::PlatformLinux (bool is_host) : 427 PlatformPOSIX(is_host) // This is the local host platform 428 { 429 } 430 431 //------------------------------------------------------------------ 432 /// Destructor. 433 /// 434 /// The destructor is virtual since this class is designed to be 435 /// inherited from by the plug-in instance. 436 //------------------------------------------------------------------ 437 PlatformLinux::~PlatformLinux() 438 { 439 } 440 441 bool 442 PlatformLinux::GetProcessInfo (lldb::pid_t pid, ProcessInstanceInfo &process_info) 443 { 444 bool success = false; 445 if (IsHost()) 446 { 447 success = Platform::GetProcessInfo (pid, process_info); 448 } 449 else 450 { 451 if (m_remote_platform_sp) 452 success = m_remote_platform_sp->GetProcessInfo (pid, process_info); 453 } 454 return success; 455 } 456 457 uint32_t 458 PlatformLinux::FindProcesses (const ProcessInstanceInfoMatch &match_info, 459 ProcessInstanceInfoList &process_infos) 460 { 461 uint32_t match_count = 0; 462 if (IsHost()) 463 { 464 // Let the base class figure out the host details 465 match_count = Platform::FindProcesses (match_info, process_infos); 466 } 467 else 468 { 469 // If we are remote, we can only return results if we are connected 470 if (m_remote_platform_sp) 471 match_count = m_remote_platform_sp->FindProcesses (match_info, process_infos); 472 } 473 return match_count; 474 } 475 476 bool 477 PlatformLinux::GetSupportedArchitectureAtIndex (uint32_t idx, ArchSpec &arch) 478 { 479 if (IsHost()) 480 { 481 ArchSpec hostArch = HostInfo::GetArchitecture(HostInfo::eArchKindDefault); 482 if (hostArch.GetTriple().isOSLinux()) 483 { 484 if (idx == 0) 485 { 486 arch = hostArch; 487 return arch.IsValid(); 488 } 489 else if (idx == 1) 490 { 491 // If the default host architecture is 64-bit, look for a 32-bit variant 492 if (hostArch.IsValid() && hostArch.GetTriple().isArch64Bit()) 493 { 494 arch = HostInfo::GetArchitecture(HostInfo::eArchKind32); 495 return arch.IsValid(); 496 } 497 } 498 } 499 } 500 else 501 { 502 if (m_remote_platform_sp) 503 return m_remote_platform_sp->GetSupportedArchitectureAtIndex(idx, arch); 504 505 llvm::Triple triple; 506 // Set the OS to linux 507 triple.setOS(llvm::Triple::Linux); 508 // Set the architecture 509 switch (idx) 510 { 511 case 0: triple.setArchName("x86_64"); break; 512 case 1: triple.setArchName("i386"); break; 513 case 2: triple.setArchName("arm"); break; 514 case 3: triple.setArchName("aarch64"); break; 515 case 4: triple.setArchName("mips64"); break; 516 case 5: triple.setArchName("hexagon"); break; 517 case 6: triple.setArchName("mips"); break; 518 default: return false; 519 } 520 // Leave the vendor as "llvm::Triple:UnknownVendor" and don't specify the vendor by 521 // calling triple.SetVendorName("unknown") so that it is a "unspecified unknown". 522 // This means when someone calls triple.GetVendorName() it will return an empty string 523 // which indicates that the vendor can be set when two architectures are merged 524 525 // Now set the triple into "arch" and return true 526 arch.SetTriple(triple); 527 return true; 528 } 529 return false; 530 } 531 532 void 533 PlatformLinux::GetStatus (Stream &strm) 534 { 535 Platform::GetStatus(strm); 536 537 #ifndef LLDB_DISABLE_POSIX 538 // Display local kernel information only when we are running in host mode. 539 // Otherwise, we would end up printing non-Linux information (when running 540 // on Mac OS for example). 541 if (IsHost()) 542 { 543 struct utsname un; 544 545 if (uname(&un)) 546 return; 547 548 strm.Printf (" Kernel: %s\n", un.sysname); 549 strm.Printf (" Release: %s\n", un.release); 550 strm.Printf (" Version: %s\n", un.version); 551 } 552 #endif 553 } 554 555 size_t 556 PlatformLinux::GetSoftwareBreakpointTrapOpcode (Target &target, 557 BreakpointSite *bp_site) 558 { 559 ArchSpec arch = target.GetArchitecture(); 560 const uint8_t *trap_opcode = NULL; 561 size_t trap_opcode_size = 0; 562 563 switch (arch.GetMachine()) 564 { 565 default: 566 assert(false && "CPU type not supported!"); 567 break; 568 569 case llvm::Triple::aarch64: 570 { 571 static const uint8_t g_aarch64_opcode[] = { 0x00, 0x00, 0x20, 0xd4 }; 572 trap_opcode = g_aarch64_opcode; 573 trap_opcode_size = sizeof(g_aarch64_opcode); 574 } 575 break; 576 case llvm::Triple::x86: 577 case llvm::Triple::x86_64: 578 { 579 static const uint8_t g_i386_breakpoint_opcode[] = { 0xCC }; 580 trap_opcode = g_i386_breakpoint_opcode; 581 trap_opcode_size = sizeof(g_i386_breakpoint_opcode); 582 } 583 break; 584 case llvm::Triple::hexagon: 585 { 586 static const uint8_t g_hex_opcode[] = { 0x0c, 0xdb, 0x00, 0x54 }; 587 trap_opcode = g_hex_opcode; 588 trap_opcode_size = sizeof(g_hex_opcode); 589 } 590 break; 591 case llvm::Triple::arm: 592 { 593 // The ARM reference recommends the use of 0xe7fddefe and 0xdefe 594 // but the linux kernel does otherwise. 595 static const uint8_t g_arm_breakpoint_opcode[] = { 0xf0, 0x01, 0xf0, 0xe7 }; 596 static const uint8_t g_thumb_breakpoint_opcode[] = { 0x01, 0xde }; 597 598 lldb::BreakpointLocationSP bp_loc_sp (bp_site->GetOwnerAtIndex (0)); 599 AddressClass addr_class = eAddressClassUnknown; 600 601 if (bp_loc_sp) 602 addr_class = bp_loc_sp->GetAddress ().GetAddressClass (); 603 604 if (addr_class == eAddressClassCodeAlternateISA 605 || (addr_class == eAddressClassUnknown && (bp_site->GetLoadAddress() & 1))) 606 { 607 trap_opcode = g_thumb_breakpoint_opcode; 608 trap_opcode_size = sizeof(g_thumb_breakpoint_opcode); 609 } 610 else 611 { 612 trap_opcode = g_arm_breakpoint_opcode; 613 trap_opcode_size = sizeof(g_arm_breakpoint_opcode); 614 } 615 } 616 break; 617 case llvm::Triple::mips: 618 case llvm::Triple::mips64: 619 { 620 static const uint8_t g_hex_opcode[] = { 0x00, 0x00, 0x00, 0x0d }; 621 trap_opcode = g_hex_opcode; 622 trap_opcode_size = sizeof(g_hex_opcode); 623 } 624 break; 625 case llvm::Triple::mipsel: 626 case llvm::Triple::mips64el: 627 { 628 static const uint8_t g_hex_opcode[] = { 0x0d, 0x00, 0x00, 0x00 }; 629 trap_opcode = g_hex_opcode; 630 trap_opcode_size = sizeof(g_hex_opcode); 631 } 632 break; 633 } 634 635 if (bp_site->SetTrapOpcode(trap_opcode, trap_opcode_size)) 636 return trap_opcode_size; 637 return 0; 638 } 639 640 int32_t 641 PlatformLinux::GetResumeCountForLaunchInfo (ProcessLaunchInfo &launch_info) 642 { 643 int32_t resume_count = 0; 644 645 // Always resume past the initial stop when we use eLaunchFlagDebug 646 if (launch_info.GetFlags ().Test (eLaunchFlagDebug)) 647 { 648 // Resume past the stop for the final exec into the true inferior. 649 ++resume_count; 650 } 651 652 // If we're not launching a shell, we're done. 653 const FileSpec &shell = launch_info.GetShell(); 654 if (!shell) 655 return resume_count; 656 657 std::string shell_string = shell.GetPath(); 658 // We're in a shell, so for sure we have to resume past the shell exec. 659 ++resume_count; 660 661 // Figure out what shell we're planning on using. 662 const char *shell_name = strrchr (shell_string.c_str(), '/'); 663 if (shell_name == NULL) 664 shell_name = shell_string.c_str(); 665 else 666 shell_name++; 667 668 if (strcmp (shell_name, "csh") == 0 669 || strcmp (shell_name, "tcsh") == 0 670 || strcmp (shell_name, "zsh") == 0 671 || strcmp (shell_name, "sh") == 0) 672 { 673 // These shells seem to re-exec themselves. Add another resume. 674 ++resume_count; 675 } 676 677 return resume_count; 678 } 679 680 bool 681 PlatformLinux::UseLlgsForLocalDebugging () 682 { 683 PlatformLinuxPropertiesSP properties_sp = GetGlobalProperties (); 684 assert (properties_sp && "global properties shared pointer is null"); 685 return properties_sp ? properties_sp->GetUseLlgsForLocal () : false; 686 } 687 688 bool 689 PlatformLinux::CanDebugProcess () 690 { 691 if (IsHost ()) 692 { 693 // The platform only does local debugging (i.e. uses llgs) when the setting indicates we do that. 694 // Otherwise, we'll use ProcessLinux/ProcessPOSIX to handle with ProcessMonitor. 695 return UseLlgsForLocalDebugging (); 696 } 697 else 698 { 699 // If we're connected, we can debug. 700 return IsConnected (); 701 } 702 } 703 704 // For local debugging, Linux will override the debug logic to use llgs-launch rather than 705 // lldb-launch, llgs-attach. This differs from current lldb-launch, debugserver-attach 706 // approach on MacOSX. 707 lldb::ProcessSP 708 PlatformLinux::DebugProcess (ProcessLaunchInfo &launch_info, 709 Debugger &debugger, 710 Target *target, // Can be NULL, if NULL create a new target, else use existing one 711 Error &error) 712 { 713 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_PLATFORM)); 714 if (log) 715 log->Printf ("PlatformLinux::%s entered (target %p)", __FUNCTION__, static_cast<void*>(target)); 716 717 // If we're a remote host, use standard behavior from parent class. 718 if (!IsHost ()) 719 return PlatformPOSIX::DebugProcess (launch_info, debugger, target, error); 720 721 // 722 // For local debugging, we'll insist on having ProcessGDBRemote create the process. 723 // 724 725 ProcessSP process_sp; 726 727 // Ensure we're using llgs for local debugging. 728 if (!UseLlgsForLocalDebugging ()) 729 { 730 assert (false && "we're trying to debug a local process but platform.plugin.linux.use-llgs-for-local is false, should never get here"); 731 error.SetErrorString ("attempted to start gdb-remote-based debugging for local process but platform.plugin.linux.use-llgs-for-local is false"); 732 return process_sp; 733 } 734 735 // Make sure we stop at the entry point 736 launch_info.GetFlags ().Set (eLaunchFlagDebug); 737 738 // We always launch the process we are going to debug in a separate process 739 // group, since then we can handle ^C interrupts ourselves w/o having to worry 740 // about the target getting them as well. 741 launch_info.SetLaunchInSeparateProcessGroup(true); 742 743 // Ensure we have a target. 744 if (target == nullptr) 745 { 746 if (log) 747 log->Printf ("PlatformLinux::%s creating new target", __FUNCTION__); 748 749 TargetSP new_target_sp; 750 error = debugger.GetTargetList().CreateTarget (debugger, 751 nullptr, 752 nullptr, 753 false, 754 nullptr, 755 new_target_sp); 756 if (error.Fail ()) 757 { 758 if (log) 759 log->Printf ("PlatformLinux::%s failed to create new target: %s", __FUNCTION__, error.AsCString ()); 760 return process_sp; 761 } 762 763 target = new_target_sp.get(); 764 if (!target) 765 { 766 error.SetErrorString ("CreateTarget() returned nullptr"); 767 if (log) 768 log->Printf ("PlatformLinux::%s failed: %s", __FUNCTION__, error.AsCString ()); 769 return process_sp; 770 } 771 } 772 else 773 { 774 if (log) 775 log->Printf ("PlatformLinux::%s using provided target", __FUNCTION__); 776 } 777 778 // Mark target as currently selected target. 779 debugger.GetTargetList().SetSelectedTarget(target); 780 781 // Now create the gdb-remote process. 782 if (log) 783 log->Printf ("PlatformLinux::%s having target create process with gdb-remote plugin", __FUNCTION__); 784 process_sp = target->CreateProcess (launch_info.GetListenerForProcess(debugger), "gdb-remote", nullptr); 785 786 if (!process_sp) 787 { 788 error.SetErrorString ("CreateProcess() failed for gdb-remote process"); 789 if (log) 790 log->Printf ("PlatformLinux::%s failed: %s", __FUNCTION__, error.AsCString ()); 791 return process_sp; 792 } 793 else 794 { 795 if (log) 796 log->Printf ("PlatformLinux::%s successfully created process", __FUNCTION__); 797 } 798 799 // Set the unix signals properly. 800 process_sp->SetUnixSignals (Host::GetUnixSignals ()); 801 802 // Adjust launch for a hijacker. 803 ListenerSP listener_sp; 804 if (!launch_info.GetHijackListener ()) 805 { 806 if (log) 807 log->Printf ("PlatformLinux::%s setting up hijacker", __FUNCTION__); 808 809 listener_sp.reset (new Listener("lldb.PlatformLinux.DebugProcess.hijack")); 810 launch_info.SetHijackListener (listener_sp); 811 process_sp->HijackProcessEvents (listener_sp.get ()); 812 } 813 814 // Log file actions. 815 if (log) 816 { 817 log->Printf ("PlatformLinux::%s launching process with the following file actions:", __FUNCTION__); 818 819 StreamString stream; 820 size_t i = 0; 821 const FileAction *file_action; 822 while ((file_action = launch_info.GetFileActionAtIndex (i++)) != nullptr) 823 { 824 file_action->Dump (stream); 825 log->PutCString (stream.GetString().c_str ()); 826 stream.Clear(); 827 } 828 } 829 830 // Do the launch. 831 error = process_sp->Launch(launch_info); 832 if (error.Success ()) 833 { 834 // Handle the hijacking of process events. 835 if (listener_sp) 836 { 837 const StateType state = process_sp->WaitForProcessToStop (NULL, NULL, false, listener_sp.get()); 838 839 if (state == eStateStopped) 840 { 841 if (log) 842 log->Printf ("PlatformLinux::%s pid %" PRIu64 " state %s\n", 843 __FUNCTION__, process_sp->GetID (), StateAsCString (state)); 844 } 845 else 846 { 847 if (log) 848 log->Printf ("PlatformLinux::%s pid %" PRIu64 " state is not stopped - %s\n", 849 __FUNCTION__, process_sp->GetID (), StateAsCString (state)); 850 } 851 } 852 853 // Hook up process PTY if we have one (which we should for local debugging with llgs). 854 int pty_fd = launch_info.GetPTY().ReleaseMasterFileDescriptor(); 855 if (pty_fd != lldb_utility::PseudoTerminal::invalid_fd) 856 { 857 process_sp->SetSTDIOFileDescriptor(pty_fd); 858 if (log) 859 log->Printf ("PlatformLinux::%s pid %" PRIu64 " hooked up STDIO pty to process", __FUNCTION__, process_sp->GetID ()); 860 } 861 else 862 { 863 if (log) 864 log->Printf ("PlatformLinux::%s pid %" PRIu64 " not using process STDIO pty", __FUNCTION__, process_sp->GetID ()); 865 } 866 } 867 else 868 { 869 if (log) 870 log->Printf ("PlatformLinux::%s process launch failed: %s", __FUNCTION__, error.AsCString ()); 871 // FIXME figure out appropriate cleanup here. Do we delete the target? Do we delete the process? Does our caller do that? 872 } 873 874 return process_sp; 875 } 876 877 void 878 PlatformLinux::CalculateTrapHandlerSymbolNames () 879 { 880 m_trap_handlers.push_back (ConstString ("_sigtramp")); 881 } 882 883 Error 884 PlatformLinux::LaunchNativeProcess (ProcessLaunchInfo &launch_info, 885 NativeProcessProtocol::NativeDelegate &native_delegate, 886 NativeProcessProtocolSP &process_sp) 887 { 888 #if !defined(__linux__) 889 return Error("Only implemented on Linux hosts"); 890 #else 891 if (!IsHost ()) 892 return Error("PlatformLinux::%s (): cannot launch a debug process when not the host", __FUNCTION__); 893 894 // Retrieve the exe module. 895 lldb::ModuleSP exe_module_sp; 896 ModuleSpec exe_module_spec(launch_info.GetExecutableFile(), launch_info.GetArchitecture()); 897 898 Error error = ResolveExecutable ( 899 exe_module_spec, 900 exe_module_sp, 901 NULL); 902 903 if (!error.Success ()) 904 return error; 905 906 if (!exe_module_sp) 907 return Error("exe_module_sp could not be resolved for %s", launch_info.GetExecutableFile ().GetPath ().c_str ()); 908 909 // Launch it for debugging 910 error = process_linux::NativeProcessLinux::LaunchProcess ( 911 exe_module_sp.get (), 912 launch_info, 913 native_delegate, 914 process_sp); 915 916 return error; 917 #endif 918 } 919 920 Error 921 PlatformLinux::AttachNativeProcess (lldb::pid_t pid, 922 NativeProcessProtocol::NativeDelegate &native_delegate, 923 NativeProcessProtocolSP &process_sp) 924 { 925 #if !defined(__linux__) 926 return Error("Only implemented on Linux hosts"); 927 #else 928 if (!IsHost ()) 929 return Error("PlatformLinux::%s (): cannot attach to a debug process when not the host", __FUNCTION__); 930 931 // Launch it for debugging 932 return process_linux::NativeProcessLinux::AttachToProcess (pid, native_delegate, process_sp); 933 #endif 934 } 935 936 uint64_t 937 PlatformLinux::ConvertMmapFlagsToPlatform(unsigned flags) 938 { 939 uint64_t flags_platform = 0; 940 if (flags & eMmapFlagsPrivate) 941 flags_platform |= MAP_PRIVATE; 942 if (flags & eMmapFlagsAnon) 943 flags_platform |= MAP_ANON; 944 return flags_platform; 945 } 946