1 //===-- DynamicLoaderMacOSXDYLD.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 11 #include "lldb/Breakpoint/StoppointCallbackContext.h" 12 #include "lldb/Core/DataBuffer.h" 13 #include "lldb/Core/DataBufferHeap.h" 14 #include "lldb/Core/Log.h" 15 #include "lldb/Core/Module.h" 16 #include "lldb/Core/ModuleSpec.h" 17 #include "lldb/Core/PluginManager.h" 18 #include "lldb/Core/Section.h" 19 #include "lldb/Core/State.h" 20 #include "lldb/Symbol/Function.h" 21 #include "lldb/Symbol/ObjectFile.h" 22 #include "lldb/Target/ObjCLanguageRuntime.h" 23 #include "lldb/Target/RegisterContext.h" 24 #include "lldb/Target/Target.h" 25 #include "lldb/Target/Thread.h" 26 #include "lldb/Target/ThreadPlanRunToAddress.h" 27 #include "lldb/Target/StackFrame.h" 28 29 #include "DynamicLoaderMacOSXDYLD.h" 30 31 //#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN 32 #ifdef ENABLE_DEBUG_PRINTF 33 #include <stdio.h> 34 #define DEBUG_PRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__) 35 #else 36 #define DEBUG_PRINTF(fmt, ...) 37 #endif 38 39 #ifndef __APPLE__ 40 #include "Utility/UuidCompatibility.h" 41 #endif 42 43 using namespace lldb; 44 using namespace lldb_private; 45 46 /// FIXME - The ObjC Runtime trampoline handler doesn't really belong here. 47 /// I am putting it here so I can invoke it in the Trampoline code here, but 48 /// it should be moved to the ObjC Runtime support when it is set up. 49 50 51 DynamicLoaderMacOSXDYLD::DYLDImageInfo * 52 DynamicLoaderMacOSXDYLD::GetImageInfo (Module *module) 53 { 54 const UUID &module_uuid = module->GetUUID(); 55 DYLDImageInfo::collection::iterator pos, end = m_dyld_image_infos.end(); 56 57 // First try just by UUID as it is the safest. 58 if (module_uuid.IsValid()) 59 { 60 for (pos = m_dyld_image_infos.begin(); pos != end; ++pos) 61 { 62 if (pos->uuid == module_uuid) 63 return &(*pos); 64 } 65 66 if (m_dyld.uuid == module_uuid) 67 return &m_dyld; 68 } 69 70 // Next try by platform path only for things that don't have a valid UUID 71 // since if a file has a valid UUID in real life it should also in the 72 // dyld info. This is the next safest because the paths in the dyld info 73 // are platform paths, not local paths. For local debugging platform == local 74 // paths. 75 const FileSpec &platform_file_spec = module->GetPlatformFileSpec(); 76 for (pos = m_dyld_image_infos.begin(); pos != end; ++pos) 77 { 78 if (pos->file_spec == platform_file_spec && pos->uuid.IsValid() == false) 79 return &(*pos); 80 } 81 82 if (m_dyld.file_spec == platform_file_spec && m_dyld.uuid.IsValid() == false) 83 return &m_dyld; 84 85 return NULL; 86 } 87 88 //---------------------------------------------------------------------- 89 // Create an instance of this class. This function is filled into 90 // the plugin info class that gets handed out by the plugin factory and 91 // allows the lldb to instantiate an instance of this class. 92 //---------------------------------------------------------------------- 93 DynamicLoader * 94 DynamicLoaderMacOSXDYLD::CreateInstance (Process* process, bool force) 95 { 96 bool create = force; 97 if (!create) 98 { 99 create = true; 100 Module* exe_module = process->GetTarget().GetExecutableModulePointer(); 101 if (exe_module) 102 { 103 ObjectFile *object_file = exe_module->GetObjectFile(); 104 if (object_file) 105 { 106 create = (object_file->GetStrata() == ObjectFile::eStrataUser); 107 } 108 } 109 110 if (create) 111 { 112 const llvm::Triple &triple_ref = process->GetTarget().GetArchitecture().GetTriple(); 113 switch (triple_ref.getOS()) 114 { 115 case llvm::Triple::Darwin: 116 case llvm::Triple::MacOSX: 117 case llvm::Triple::IOS: 118 create = triple_ref.getVendor() == llvm::Triple::Apple; 119 break; 120 default: 121 create = false; 122 break; 123 } 124 } 125 } 126 127 if (create) 128 return new DynamicLoaderMacOSXDYLD (process); 129 return NULL; 130 } 131 132 //---------------------------------------------------------------------- 133 // Constructor 134 //---------------------------------------------------------------------- 135 DynamicLoaderMacOSXDYLD::DynamicLoaderMacOSXDYLD (Process* process) : 136 DynamicLoader(process), 137 m_dyld(), 138 m_dyld_module_wp(), 139 m_dyld_all_image_infos_addr(LLDB_INVALID_ADDRESS), 140 m_dyld_all_image_infos(), 141 m_dyld_all_image_infos_stop_id (UINT32_MAX), 142 m_break_id(LLDB_INVALID_BREAK_ID), 143 m_dyld_image_infos(), 144 m_dyld_image_infos_stop_id (UINT32_MAX), 145 m_mutex(Mutex::eMutexTypeRecursive), 146 m_process_image_addr_is_all_images_infos (false) 147 { 148 } 149 150 //---------------------------------------------------------------------- 151 // Destructor 152 //---------------------------------------------------------------------- 153 DynamicLoaderMacOSXDYLD::~DynamicLoaderMacOSXDYLD() 154 { 155 Clear(true); 156 } 157 158 //------------------------------------------------------------------ 159 /// Called after attaching a process. 160 /// 161 /// Allow DynamicLoader plug-ins to execute some code after 162 /// attaching to a process. 163 //------------------------------------------------------------------ 164 void 165 DynamicLoaderMacOSXDYLD::DidAttach () 166 { 167 PrivateInitialize(m_process); 168 LocateDYLD (); 169 SetNotificationBreakpoint (); 170 } 171 172 //------------------------------------------------------------------ 173 /// Called after attaching a process. 174 /// 175 /// Allow DynamicLoader plug-ins to execute some code after 176 /// attaching to a process. 177 //------------------------------------------------------------------ 178 void 179 DynamicLoaderMacOSXDYLD::DidLaunch () 180 { 181 PrivateInitialize(m_process); 182 LocateDYLD (); 183 SetNotificationBreakpoint (); 184 } 185 186 bool 187 DynamicLoaderMacOSXDYLD::ProcessDidExec () 188 { 189 if (m_process) 190 { 191 // If we are stopped after an exec, we will have only one thread... 192 if (m_process->GetThreadList().GetSize() == 1) 193 { 194 // We know if a process has exec'ed if our "m_dyld_all_image_infos_addr" 195 // value differs from the Process' image info address. When a process 196 // execs itself it might cause a change if ASLR is enabled. 197 const addr_t shlib_addr = m_process->GetImageInfoAddress (); 198 if (m_process_image_addr_is_all_images_infos == true && shlib_addr != m_dyld_all_image_infos_addr) 199 { 200 // The image info address from the process is the 'dyld_all_image_infos' 201 // address and it has changed. 202 return true; 203 } 204 205 if (m_process_image_addr_is_all_images_infos == false && shlib_addr == m_dyld.address) 206 { 207 // The image info address from the process is the mach_header 208 // address for dyld and it has changed. 209 return true; 210 } 211 212 // ASLR might be disabled and dyld could have ended up in the same 213 // location. We should try and detect if we are stopped at '_dyld_start' 214 ThreadSP thread_sp (m_process->GetThreadList().GetThreadAtIndex(0)); 215 if (thread_sp) 216 { 217 lldb::StackFrameSP frame_sp (thread_sp->GetStackFrameAtIndex(0)); 218 if (frame_sp) 219 { 220 const Symbol *symbol = frame_sp->GetSymbolContext(eSymbolContextSymbol).symbol; 221 if (symbol) 222 { 223 if (symbol->GetName() == ConstString("_dyld_start")) 224 return true; 225 } 226 } 227 } 228 } 229 } 230 return false; 231 } 232 233 234 235 //---------------------------------------------------------------------- 236 // Clear out the state of this class. 237 //---------------------------------------------------------------------- 238 void 239 DynamicLoaderMacOSXDYLD::Clear (bool clear_process) 240 { 241 Mutex::Locker locker(m_mutex); 242 243 if (m_process->IsAlive() && LLDB_BREAK_ID_IS_VALID(m_break_id)) 244 m_process->GetTarget().RemoveBreakpointByID (m_break_id); 245 246 if (clear_process) 247 m_process = NULL; 248 m_dyld.Clear(false); 249 m_dyld_all_image_infos_addr = LLDB_INVALID_ADDRESS; 250 m_dyld_all_image_infos.Clear(); 251 m_break_id = LLDB_INVALID_BREAK_ID; 252 m_dyld_image_infos.clear(); 253 } 254 255 //---------------------------------------------------------------------- 256 // Check if we have found DYLD yet 257 //---------------------------------------------------------------------- 258 bool 259 DynamicLoaderMacOSXDYLD::DidSetNotificationBreakpoint() const 260 { 261 return LLDB_BREAK_ID_IS_VALID (m_break_id); 262 } 263 264 //---------------------------------------------------------------------- 265 // Try and figure out where dyld is by first asking the Process 266 // if it knows (which currently calls down in the lldb::Process 267 // to get the DYLD info (available on SnowLeopard only). If that fails, 268 // then check in the default addresses. 269 //---------------------------------------------------------------------- 270 bool 271 DynamicLoaderMacOSXDYLD::LocateDYLD() 272 { 273 if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS) 274 { 275 // Check the image info addr as it might point to the 276 // mach header for dyld, or it might point to the 277 // dyld_all_image_infos struct 278 const addr_t shlib_addr = m_process->GetImageInfoAddress (); 279 if (shlib_addr != LLDB_INVALID_ADDRESS) 280 { 281 ByteOrder byte_order = m_process->GetTarget().GetArchitecture().GetByteOrder(); 282 uint8_t buf[4]; 283 DataExtractor data (buf, sizeof(buf), byte_order, 4); 284 Error error; 285 if (m_process->ReadMemory (shlib_addr, buf, 4, error) == 4) 286 { 287 lldb::offset_t offset = 0; 288 uint32_t magic = data.GetU32 (&offset); 289 switch (magic) 290 { 291 case llvm::MachO::MH_MAGIC: 292 case llvm::MachO::MH_MAGIC_64: 293 case llvm::MachO::MH_CIGAM: 294 case llvm::MachO::MH_CIGAM_64: 295 m_process_image_addr_is_all_images_infos = false; 296 return ReadDYLDInfoFromMemoryAndSetNotificationCallback(shlib_addr); 297 298 default: 299 break; 300 } 301 } 302 // Maybe it points to the all image infos? 303 m_dyld_all_image_infos_addr = shlib_addr; 304 m_process_image_addr_is_all_images_infos = true; 305 } 306 } 307 308 if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS) 309 { 310 if (ReadAllImageInfosStructure ()) 311 { 312 if (m_dyld_all_image_infos.dyldImageLoadAddress != LLDB_INVALID_ADDRESS) 313 return ReadDYLDInfoFromMemoryAndSetNotificationCallback (m_dyld_all_image_infos.dyldImageLoadAddress); 314 else 315 return ReadDYLDInfoFromMemoryAndSetNotificationCallback (m_dyld_all_image_infos_addr & 0xfffffffffff00000ull); 316 } 317 } 318 319 // Check some default values 320 Module *executable = m_process->GetTarget().GetExecutableModulePointer(); 321 322 if (executable) 323 { 324 const ArchSpec &exe_arch = executable->GetArchitecture(); 325 if (exe_arch.GetAddressByteSize() == 8) 326 { 327 return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x7fff5fc00000ull); 328 } 329 else if (exe_arch.GetMachine() == llvm::Triple::arm || exe_arch.GetMachine() == llvm::Triple::thumb || exe_arch.GetMachine() == llvm::Triple::aarch64) 330 { 331 return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x2fe00000); 332 } 333 else 334 { 335 return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x8fe00000); 336 } 337 } 338 return false; 339 } 340 341 ModuleSP 342 DynamicLoaderMacOSXDYLD::FindTargetModuleForDYLDImageInfo (DYLDImageInfo &image_info, bool can_create, bool *did_create_ptr) 343 { 344 if (did_create_ptr) 345 *did_create_ptr = false; 346 347 Target &target = m_process->GetTarget(); 348 const ModuleList &target_images = target.GetImages(); 349 ModuleSpec module_spec (image_info.file_spec); 350 module_spec.GetUUID() = image_info.uuid; 351 ModuleSP module_sp (target_images.FindFirstModule (module_spec)); 352 353 if (module_sp && !module_spec.GetUUID().IsValid() && !module_sp->GetUUID().IsValid()) 354 { 355 // No UUID, we must rely upon the cached module modification 356 // time and the modification time of the file on disk 357 if (module_sp->GetModificationTime() != module_sp->GetFileSpec().GetModificationTime()) 358 module_sp.reset(); 359 } 360 361 if (!module_sp) 362 { 363 if (can_create) 364 { 365 module_sp = target.GetSharedModule (module_spec); 366 if (!module_sp || module_sp->GetObjectFile() == NULL) 367 module_sp = m_process->ReadModuleFromMemory (image_info.file_spec, image_info.address); 368 369 if (did_create_ptr) 370 *did_create_ptr = (bool) module_sp; 371 } 372 } 373 return module_sp; 374 } 375 376 //---------------------------------------------------------------------- 377 // Assume that dyld is in memory at ADDR and try to parse it's load 378 // commands 379 //---------------------------------------------------------------------- 380 bool 381 DynamicLoaderMacOSXDYLD::ReadDYLDInfoFromMemoryAndSetNotificationCallback(lldb::addr_t addr) 382 { 383 DataExtractor data; // Load command data 384 if (ReadMachHeader (addr, &m_dyld.header, &data)) 385 { 386 if (m_dyld.header.filetype == llvm::MachO::MH_DYLINKER) 387 { 388 m_dyld.address = addr; 389 ModuleSP dyld_module_sp; 390 if (ParseLoadCommands (data, m_dyld, &m_dyld.file_spec)) 391 { 392 if (m_dyld.file_spec) 393 { 394 dyld_module_sp = FindTargetModuleForDYLDImageInfo (m_dyld, true, NULL); 395 396 if (dyld_module_sp) 397 UpdateImageLoadAddress (dyld_module_sp.get(), m_dyld); 398 } 399 } 400 401 Target &target = m_process->GetTarget(); 402 403 if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS && dyld_module_sp.get()) 404 { 405 static ConstString g_dyld_all_image_infos ("dyld_all_image_infos"); 406 const Symbol *symbol = dyld_module_sp->FindFirstSymbolWithNameAndType (g_dyld_all_image_infos, eSymbolTypeData); 407 if (symbol) 408 m_dyld_all_image_infos_addr = symbol->GetAddress().GetLoadAddress(&target); 409 } 410 411 // Update all image infos 412 InitializeFromAllImageInfos (); 413 414 // If we didn't have an executable before, but now we do, then the 415 // dyld module shared pointer might be unique and we may need to add 416 // it again (since Target::SetExecutableModule() will clear the 417 // images). So append the dyld module back to the list if it is 418 /// unique! 419 if (dyld_module_sp) 420 { 421 target.GetImages().AppendIfNeeded (dyld_module_sp); 422 423 // At this point we should have read in dyld's module, and so we should set breakpoints in it: 424 ModuleList modules; 425 modules.Append(dyld_module_sp); 426 target.ModulesDidLoad(modules); 427 m_dyld_module_wp = dyld_module_sp; 428 } 429 return true; 430 } 431 } 432 return false; 433 } 434 435 bool 436 DynamicLoaderMacOSXDYLD::NeedToLocateDYLD () const 437 { 438 return m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS; 439 } 440 441 //---------------------------------------------------------------------- 442 // Update the load addresses for all segments in MODULE using the 443 // updated INFO that is passed in. 444 //---------------------------------------------------------------------- 445 bool 446 DynamicLoaderMacOSXDYLD::UpdateImageLoadAddress (Module *module, DYLDImageInfo& info) 447 { 448 bool changed = false; 449 if (module) 450 { 451 ObjectFile *image_object_file = module->GetObjectFile(); 452 if (image_object_file) 453 { 454 SectionList *section_list = image_object_file->GetSectionList (); 455 if (section_list) 456 { 457 std::vector<uint32_t> inaccessible_segment_indexes; 458 // We now know the slide amount, so go through all sections 459 // and update the load addresses with the correct values. 460 const size_t num_segments = info.segments.size(); 461 for (size_t i=0; i<num_segments; ++i) 462 { 463 // Only load a segment if it has protections. Things like 464 // __PAGEZERO don't have any protections, and they shouldn't 465 // be slid 466 SectionSP section_sp(section_list->FindSectionByName(info.segments[i].name)); 467 468 if (info.segments[i].maxprot == 0) 469 { 470 inaccessible_segment_indexes.push_back(i); 471 } 472 else 473 { 474 const addr_t new_section_load_addr = info.segments[i].vmaddr + info.slide; 475 static ConstString g_section_name_LINKEDIT ("__LINKEDIT"); 476 477 if (section_sp) 478 { 479 // __LINKEDIT sections from files in the shared cache 480 // can overlap so check to see what the segment name is 481 // and pass "false" so we don't warn of overlapping 482 // "Section" objects, and "true" for all other sections. 483 const bool warn_multiple = section_sp->GetName() != g_section_name_LINKEDIT; 484 485 changed = m_process->GetTarget().SetSectionLoadAddress (section_sp, new_section_load_addr, warn_multiple); 486 } 487 else 488 { 489 Host::SystemLog (Host::eSystemLogWarning, 490 "warning: unable to find and load segment named '%s' at 0x%" PRIx64 " in '%s' in macosx dynamic loader plug-in.\n", 491 info.segments[i].name.AsCString("<invalid>"), 492 (uint64_t)new_section_load_addr, 493 image_object_file->GetFileSpec().GetPath().c_str()); 494 } 495 } 496 } 497 498 // If the loaded the file (it changed) and we have segments that 499 // are not readable or writeable, add them to the invalid memory 500 // region cache for the process. This will typically only be 501 // the __PAGEZERO segment in the main executable. We might be able 502 // to apply this more generally to more sections that have no 503 // protections in the future, but for now we are going to just 504 // do __PAGEZERO. 505 if (changed && !inaccessible_segment_indexes.empty()) 506 { 507 for (uint32_t i=0; i<inaccessible_segment_indexes.size(); ++i) 508 { 509 const uint32_t seg_idx = inaccessible_segment_indexes[i]; 510 SectionSP section_sp(section_list->FindSectionByName(info.segments[seg_idx].name)); 511 512 if (section_sp) 513 { 514 static ConstString g_pagezero_section_name("__PAGEZERO"); 515 if (g_pagezero_section_name == section_sp->GetName()) 516 { 517 // __PAGEZERO never slides... 518 const lldb::addr_t vmaddr = info.segments[seg_idx].vmaddr; 519 const lldb::addr_t vmsize = info.segments[seg_idx].vmsize; 520 Process::LoadRange pagezero_range (vmaddr, vmsize); 521 m_process->AddInvalidMemoryRegion(pagezero_range); 522 } 523 } 524 } 525 } 526 } 527 } 528 } 529 // We might have an in memory image that was loaded as soon as it was created 530 if (info.load_stop_id == m_process->GetStopID()) 531 changed = true; 532 else if (changed) 533 { 534 // Update the stop ID when this library was updated 535 info.load_stop_id = m_process->GetStopID(); 536 } 537 return changed; 538 } 539 540 //---------------------------------------------------------------------- 541 // Update the load addresses for all segments in MODULE using the 542 // updated INFO that is passed in. 543 //---------------------------------------------------------------------- 544 bool 545 DynamicLoaderMacOSXDYLD::UnloadImageLoadAddress (Module *module, DYLDImageInfo& info) 546 { 547 bool changed = false; 548 if (module) 549 { 550 ObjectFile *image_object_file = module->GetObjectFile(); 551 if (image_object_file) 552 { 553 SectionList *section_list = image_object_file->GetSectionList (); 554 if (section_list) 555 { 556 const size_t num_segments = info.segments.size(); 557 for (size_t i=0; i<num_segments; ++i) 558 { 559 SectionSP section_sp(section_list->FindSectionByName(info.segments[i].name)); 560 if (section_sp) 561 { 562 const addr_t old_section_load_addr = info.segments[i].vmaddr + info.slide; 563 if (m_process->GetTarget().SetSectionUnloaded (section_sp, old_section_load_addr)) 564 changed = true; 565 } 566 else 567 { 568 Host::SystemLog (Host::eSystemLogWarning, 569 "warning: unable to find and unload segment named '%s' in '%s' in macosx dynamic loader plug-in.\n", 570 info.segments[i].name.AsCString("<invalid>"), 571 image_object_file->GetFileSpec().GetPath().c_str()); 572 } 573 } 574 } 575 } 576 } 577 return changed; 578 } 579 580 581 //---------------------------------------------------------------------- 582 // Static callback function that gets called when our DYLD notification 583 // breakpoint gets hit. We update all of our image infos and then 584 // let our super class DynamicLoader class decide if we should stop 585 // or not (based on global preference). 586 //---------------------------------------------------------------------- 587 bool 588 DynamicLoaderMacOSXDYLD::NotifyBreakpointHit (void *baton, 589 StoppointCallbackContext *context, 590 lldb::user_id_t break_id, 591 lldb::user_id_t break_loc_id) 592 { 593 // Let the event know that the images have changed 594 // DYLD passes three arguments to the notification breakpoint. 595 // Arg1: enum dyld_image_mode mode - 0 = adding, 1 = removing 596 // Arg2: uint32_t infoCount - Number of shared libraries added 597 // Arg3: dyld_image_info info[] - Array of structs of the form: 598 // const struct mach_header *imageLoadAddress 599 // const char *imageFilePath 600 // uintptr_t imageFileModDate (a time_t) 601 602 DynamicLoaderMacOSXDYLD* dyld_instance = (DynamicLoaderMacOSXDYLD*) baton; 603 604 // First step is to see if we've already initialized the all image infos. If we haven't then this function 605 // will do so and return true. In the course of initializing the all_image_infos it will read the complete 606 // current state, so we don't need to figure out what has changed from the data passed in to us. 607 608 if (dyld_instance->InitializeFromAllImageInfos()) 609 return dyld_instance->GetStopWhenImagesChange(); 610 611 ExecutionContext exe_ctx (context->exe_ctx_ref); 612 Process *process = exe_ctx.GetProcessPtr(); 613 const lldb::ABISP &abi = process->GetABI(); 614 if (abi) 615 { 616 // Build up the value array to store the three arguments given above, then get the values from the ABI: 617 618 ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext(); 619 ValueList argument_values; 620 Value input_value; 621 622 ClangASTType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); 623 ClangASTType clang_uint32_type = clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(lldb::eEncodingUint, 32); 624 input_value.SetValueType (Value::eValueTypeScalar); 625 input_value.SetClangType (clang_uint32_type); 626 // input_value.SetContext (Value::eContextTypeClangType, clang_uint32_type); 627 argument_values.PushValue (input_value); 628 argument_values.PushValue (input_value); 629 input_value.SetClangType (clang_void_ptr_type); 630 // input_value.SetContext (Value::eContextTypeClangType, clang_void_ptr_type); 631 argument_values.PushValue (input_value); 632 633 if (abi->GetArgumentValues (exe_ctx.GetThreadRef(), argument_values)) 634 { 635 uint32_t dyld_mode = argument_values.GetValueAtIndex(0)->GetScalar().UInt (-1); 636 if (dyld_mode != static_cast<uint32_t>(-1)) 637 { 638 // Okay the mode was right, now get the number of elements, and the array of new elements... 639 uint32_t image_infos_count = argument_values.GetValueAtIndex(1)->GetScalar().UInt (-1); 640 if (image_infos_count != static_cast<uint32_t>(-1)) 641 { 642 // Got the number added, now go through the array of added elements, putting out the mach header 643 // address, and adding the image. 644 // Note, I'm not putting in logging here, since the AddModules & RemoveModules functions do 645 // all the logging internally. 646 647 lldb::addr_t image_infos_addr = argument_values.GetValueAtIndex(2)->GetScalar().ULongLong(); 648 if (dyld_mode == 0) 649 { 650 // This is add: 651 dyld_instance->AddModulesUsingImageInfosAddress (image_infos_addr, image_infos_count); 652 } 653 else 654 { 655 // This is remove: 656 dyld_instance->RemoveModulesUsingImageInfosAddress (image_infos_addr, image_infos_count); 657 } 658 659 } 660 } 661 } 662 } 663 664 // Return true to stop the target, false to just let the target run 665 return dyld_instance->GetStopWhenImagesChange(); 666 } 667 668 bool 669 DynamicLoaderMacOSXDYLD::ReadAllImageInfosStructure () 670 { 671 Mutex::Locker locker(m_mutex); 672 673 // the all image infos is already valid for this process stop ID 674 if (m_process->GetStopID() == m_dyld_all_image_infos_stop_id) 675 return true; 676 677 m_dyld_all_image_infos.Clear(); 678 if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS) 679 { 680 ByteOrder byte_order = m_process->GetTarget().GetArchitecture().GetByteOrder(); 681 uint32_t addr_size = 4; 682 if (m_dyld_all_image_infos_addr > UINT32_MAX) 683 addr_size = 8; 684 685 uint8_t buf[256]; 686 DataExtractor data (buf, sizeof(buf), byte_order, addr_size); 687 lldb::offset_t offset = 0; 688 689 const size_t count_v2 = sizeof (uint32_t) + // version 690 sizeof (uint32_t) + // infoArrayCount 691 addr_size + // infoArray 692 addr_size + // notification 693 addr_size + // processDetachedFromSharedRegion + libSystemInitialized + pad 694 addr_size; // dyldImageLoadAddress 695 const size_t count_v11 = count_v2 + 696 addr_size + // jitInfo 697 addr_size + // dyldVersion 698 addr_size + // errorMessage 699 addr_size + // terminationFlags 700 addr_size + // coreSymbolicationShmPage 701 addr_size + // systemOrderFlag 702 addr_size + // uuidArrayCount 703 addr_size + // uuidArray 704 addr_size + // dyldAllImageInfosAddress 705 addr_size + // initialImageCount 706 addr_size + // errorKind 707 addr_size + // errorClientOfDylibPath 708 addr_size + // errorTargetDylibPath 709 addr_size; // errorSymbol 710 const size_t count_v13 = count_v11 + 711 addr_size + // sharedCacheSlide 712 sizeof (uuid_t); // sharedCacheUUID 713 assert (sizeof (buf) >= count_v13); 714 715 Error error; 716 if (m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, 4, error) == 4) 717 { 718 m_dyld_all_image_infos.version = data.GetU32(&offset); 719 // If anything in the high byte is set, we probably got the byte 720 // order incorrect (the process might not have it set correctly 721 // yet due to attaching to a program without a specified file). 722 if (m_dyld_all_image_infos.version & 0xff000000) 723 { 724 // We have guessed the wrong byte order. Swap it and try 725 // reading the version again. 726 if (byte_order == eByteOrderLittle) 727 byte_order = eByteOrderBig; 728 else 729 byte_order = eByteOrderLittle; 730 731 data.SetByteOrder (byte_order); 732 offset = 0; 733 m_dyld_all_image_infos.version = data.GetU32(&offset); 734 } 735 } 736 else 737 { 738 return false; 739 } 740 741 const size_t count = (m_dyld_all_image_infos.version >= 11) ? count_v11 : count_v2; 742 743 const size_t bytes_read = m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, count, error); 744 if (bytes_read == count) 745 { 746 offset = 0; 747 m_dyld_all_image_infos.version = data.GetU32(&offset); 748 m_dyld_all_image_infos.dylib_info_count = data.GetU32(&offset); 749 m_dyld_all_image_infos.dylib_info_addr = data.GetPointer(&offset); 750 m_dyld_all_image_infos.notification = data.GetPointer(&offset); 751 m_dyld_all_image_infos.processDetachedFromSharedRegion = data.GetU8(&offset); 752 m_dyld_all_image_infos.libSystemInitialized = data.GetU8(&offset); 753 // Adjust for padding. 754 offset += addr_size - 2; 755 m_dyld_all_image_infos.dyldImageLoadAddress = data.GetPointer(&offset); 756 if (m_dyld_all_image_infos.version >= 11) 757 { 758 offset += addr_size * 8; 759 uint64_t dyld_all_image_infos_addr = data.GetPointer(&offset); 760 761 // When we started, we were given the actual address of the all_image_infos 762 // struct (probably via TASK_DYLD_INFO) in memory - this address is stored in 763 // m_dyld_all_image_infos_addr and is the most accurate address we have. 764 765 // We read the dyld_all_image_infos struct from memory; it contains its own address. 766 // If the address in the struct does not match the actual address, 767 // the dyld we're looking at has been loaded at a different location (slid) from 768 // where it intended to load. The addresses in the dyld_all_image_infos struct 769 // are the original, non-slid addresses, and need to be adjusted. Most importantly 770 // the address of dyld and the notification address need to be adjusted. 771 772 if (dyld_all_image_infos_addr != m_dyld_all_image_infos_addr) 773 { 774 uint64_t image_infos_offset = dyld_all_image_infos_addr - m_dyld_all_image_infos.dyldImageLoadAddress; 775 uint64_t notification_offset = m_dyld_all_image_infos.notification - m_dyld_all_image_infos.dyldImageLoadAddress; 776 m_dyld_all_image_infos.dyldImageLoadAddress = m_dyld_all_image_infos_addr - image_infos_offset; 777 m_dyld_all_image_infos.notification = m_dyld_all_image_infos.dyldImageLoadAddress + notification_offset; 778 } 779 } 780 m_dyld_all_image_infos_stop_id = m_process->GetStopID(); 781 return true; 782 } 783 } 784 return false; 785 } 786 787 788 bool 789 DynamicLoaderMacOSXDYLD::AddModulesUsingImageInfosAddress (lldb::addr_t image_infos_addr, uint32_t image_infos_count) 790 { 791 DYLDImageInfo::collection image_infos; 792 Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 793 if (log) 794 log->Printf ("Adding %d modules.\n", image_infos_count); 795 796 Mutex::Locker locker(m_mutex); 797 if (m_process->GetStopID() == m_dyld_image_infos_stop_id) 798 return true; 799 800 if (!ReadImageInfos (image_infos_addr, image_infos_count, image_infos)) 801 return false; 802 803 UpdateImageInfosHeaderAndLoadCommands (image_infos, image_infos_count, false); 804 bool return_value = AddModulesUsingImageInfos (image_infos); 805 m_dyld_image_infos_stop_id = m_process->GetStopID(); 806 return return_value; 807 } 808 809 // Adds the modules in image_infos to m_dyld_image_infos. 810 // NB don't call this passing in m_dyld_image_infos. 811 812 bool 813 DynamicLoaderMacOSXDYLD::AddModulesUsingImageInfos (DYLDImageInfo::collection &image_infos) 814 { 815 // Now add these images to the main list. 816 ModuleList loaded_module_list; 817 Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 818 Target &target = m_process->GetTarget(); 819 ModuleList& target_images = target.GetImages(); 820 821 for (uint32_t idx = 0; idx < image_infos.size(); ++idx) 822 { 823 if (log) 824 { 825 log->Printf ("Adding new image at address=0x%16.16" PRIx64 ".", image_infos[idx].address); 826 image_infos[idx].PutToLog (log); 827 } 828 829 m_dyld_image_infos.push_back(image_infos[idx]); 830 831 ModuleSP image_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[idx], true, NULL)); 832 833 if (image_module_sp) 834 { 835 ObjectFile *objfile = image_module_sp->GetObjectFile (); 836 if (objfile) 837 { 838 SectionList *sections = objfile->GetSectionList(); 839 if (sections) 840 { 841 ConstString commpage_dbstr("__commpage"); 842 Section *commpage_section = sections->FindSectionByName(commpage_dbstr).get(); 843 if (commpage_section) 844 { 845 ModuleSpec module_spec (objfile->GetFileSpec(), image_infos[idx].GetArchitecture ()); 846 module_spec.GetObjectName() = commpage_dbstr; 847 ModuleSP commpage_image_module_sp(target_images.FindFirstModule (module_spec)); 848 if (!commpage_image_module_sp) 849 { 850 module_spec.SetObjectOffset (objfile->GetFileOffset() + commpage_section->GetFileOffset()); 851 commpage_image_module_sp = target.GetSharedModule (module_spec); 852 if (!commpage_image_module_sp || commpage_image_module_sp->GetObjectFile() == NULL) 853 { 854 commpage_image_module_sp = m_process->ReadModuleFromMemory (image_infos[idx].file_spec, 855 image_infos[idx].address); 856 // Always load a memory image right away in the target in case 857 // we end up trying to read the symbol table from memory... The 858 // __LINKEDIT will need to be mapped so we can figure out where 859 // the symbol table bits are... 860 bool changed = false; 861 UpdateImageLoadAddress (commpage_image_module_sp.get(), image_infos[idx]); 862 target.GetImages().Append(commpage_image_module_sp); 863 if (changed) 864 { 865 image_infos[idx].load_stop_id = m_process->GetStopID(); 866 loaded_module_list.AppendIfNeeded (commpage_image_module_sp); 867 } 868 } 869 } 870 } 871 } 872 } 873 874 // UpdateImageLoadAddress will return true if any segments 875 // change load address. We need to check this so we don't 876 // mention that all loaded shared libraries are newly loaded 877 // each time we hit out dyld breakpoint since dyld will list all 878 // shared libraries each time. 879 if (UpdateImageLoadAddress (image_module_sp.get(), image_infos[idx])) 880 { 881 target_images.AppendIfNeeded(image_module_sp); 882 loaded_module_list.AppendIfNeeded (image_module_sp); 883 } 884 } 885 } 886 887 if (loaded_module_list.GetSize() > 0) 888 { 889 // FIXME: This should really be in the Runtime handlers class, which should get 890 // called by the target's ModulesDidLoad, but we're doing it all locally for now 891 // to save time. 892 // Also, I'm assuming there can be only one libobjc dylib loaded... 893 894 ObjCLanguageRuntime *objc_runtime = m_process->GetObjCLanguageRuntime(true); 895 if (objc_runtime != NULL && !objc_runtime->HasReadObjCLibrary()) 896 { 897 size_t num_modules = loaded_module_list.GetSize(); 898 for (size_t i = 0; i < num_modules; i++) 899 { 900 if (objc_runtime->IsModuleObjCLibrary (loaded_module_list.GetModuleAtIndex (i))) 901 { 902 objc_runtime->ReadObjCLibrary (loaded_module_list.GetModuleAtIndex (i)); 903 break; 904 } 905 } 906 } 907 if (log) 908 loaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderMacOSXDYLD::ModulesDidLoad"); 909 m_process->GetTarget().ModulesDidLoad (loaded_module_list); 910 } 911 return true; 912 } 913 914 bool 915 DynamicLoaderMacOSXDYLD::RemoveModulesUsingImageInfosAddress (lldb::addr_t image_infos_addr, uint32_t image_infos_count) 916 { 917 DYLDImageInfo::collection image_infos; 918 Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 919 920 Mutex::Locker locker(m_mutex); 921 if (m_process->GetStopID() == m_dyld_image_infos_stop_id) 922 return true; 923 924 // First read in the image_infos for the removed modules, and their headers & load commands. 925 if (!ReadImageInfos (image_infos_addr, image_infos_count, image_infos)) 926 { 927 if (log) 928 log->PutCString ("Failed reading image infos array."); 929 return false; 930 } 931 932 if (log) 933 log->Printf ("Removing %d modules.", image_infos_count); 934 935 ModuleList unloaded_module_list; 936 for (uint32_t idx = 0; idx < image_infos.size(); ++idx) 937 { 938 if (log) 939 { 940 log->Printf ("Removing module at address=0x%16.16" PRIx64 ".", image_infos[idx].address); 941 image_infos[idx].PutToLog (log); 942 } 943 944 // Remove this image_infos from the m_all_image_infos. We do the comparison by address 945 // rather than by file spec because we can have many modules with the same "file spec" in the 946 // case that they are modules loaded from memory. 947 // 948 // Also copy over the uuid from the old entry to the removed entry so we can 949 // use it to lookup the module in the module list. 950 951 DYLDImageInfo::collection::iterator pos, end = m_dyld_image_infos.end(); 952 for (pos = m_dyld_image_infos.begin(); pos != end; pos++) 953 { 954 if (image_infos[idx].address == (*pos).address) 955 { 956 image_infos[idx].uuid = (*pos).uuid; 957 958 // Add the module from this image_info to the "unloaded_module_list". We'll remove them all at 959 // one go later on. 960 961 ModuleSP unload_image_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[idx], false, NULL)); 962 if (unload_image_module_sp.get()) 963 { 964 // When we unload, be sure to use the image info from the old list, 965 // since that has sections correctly filled in. 966 UnloadImageLoadAddress (unload_image_module_sp.get(), *pos); 967 unloaded_module_list.AppendIfNeeded (unload_image_module_sp); 968 } 969 else 970 { 971 if (log) 972 { 973 log->Printf ("Could not find module for unloading info entry:"); 974 image_infos[idx].PutToLog(log); 975 } 976 } 977 978 // Then remove it from the m_dyld_image_infos: 979 980 m_dyld_image_infos.erase(pos); 981 break; 982 } 983 } 984 985 if (pos == end) 986 { 987 if (log) 988 { 989 log->Printf ("Could not find image_info entry for unloading image:"); 990 image_infos[idx].PutToLog(log); 991 } 992 } 993 } 994 if (unloaded_module_list.GetSize() > 0) 995 { 996 if (log) 997 { 998 log->PutCString("Unloaded:"); 999 unloaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderMacOSXDYLD::ModulesDidUnload"); 1000 } 1001 m_process->GetTarget().GetImages().Remove (unloaded_module_list); 1002 } 1003 m_dyld_image_infos_stop_id = m_process->GetStopID(); 1004 return true; 1005 } 1006 1007 bool 1008 DynamicLoaderMacOSXDYLD::ReadImageInfos (lldb::addr_t image_infos_addr, 1009 uint32_t image_infos_count, 1010 DYLDImageInfo::collection &image_infos) 1011 { 1012 const ByteOrder endian = m_dyld.GetByteOrder(); 1013 const uint32_t addr_size = m_dyld.GetAddressByteSize(); 1014 1015 image_infos.resize(image_infos_count); 1016 const size_t count = image_infos.size() * 3 * addr_size; 1017 DataBufferHeap info_data(count, 0); 1018 Error error; 1019 const size_t bytes_read = m_process->ReadMemory (image_infos_addr, 1020 info_data.GetBytes(), 1021 info_data.GetByteSize(), 1022 error); 1023 if (bytes_read == count) 1024 { 1025 lldb::offset_t info_data_offset = 0; 1026 DataExtractor info_data_ref(info_data.GetBytes(), info_data.GetByteSize(), endian, addr_size); 1027 for (size_t i = 0; i < image_infos.size() && info_data_ref.ValidOffset(info_data_offset); i++) 1028 { 1029 image_infos[i].address = info_data_ref.GetPointer(&info_data_offset); 1030 lldb::addr_t path_addr = info_data_ref.GetPointer(&info_data_offset); 1031 image_infos[i].mod_date = info_data_ref.GetPointer(&info_data_offset); 1032 1033 char raw_path[PATH_MAX]; 1034 m_process->ReadCStringFromMemory (path_addr, raw_path, sizeof(raw_path), error); 1035 // don't resolve the path 1036 if (error.Success()) 1037 { 1038 const bool resolve_path = false; 1039 image_infos[i].file_spec.SetFile(raw_path, resolve_path); 1040 } 1041 } 1042 return true; 1043 } 1044 else 1045 { 1046 return false; 1047 } 1048 } 1049 1050 //---------------------------------------------------------------------- 1051 // If we have found where the "_dyld_all_image_infos" lives in memory, 1052 // read the current info from it, and then update all image load 1053 // addresses (or lack thereof). Only do this if this is the first time 1054 // we're reading the dyld infos. Return true if we actually read anything, 1055 // and false otherwise. 1056 //---------------------------------------------------------------------- 1057 bool 1058 DynamicLoaderMacOSXDYLD::InitializeFromAllImageInfos () 1059 { 1060 Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 1061 1062 Mutex::Locker locker(m_mutex); 1063 if (m_process->GetStopID() == m_dyld_image_infos_stop_id 1064 || m_dyld_image_infos.size() != 0) 1065 return false; 1066 1067 if (ReadAllImageInfosStructure ()) 1068 { 1069 // Nothing to load or unload? 1070 if (m_dyld_all_image_infos.dylib_info_count == 0) 1071 return true; 1072 1073 if (m_dyld_all_image_infos.dylib_info_addr == 0) 1074 { 1075 // DYLD is updating the images now. So we should say we have no images, and then we'll 1076 // figure it out when we hit the added breakpoint. 1077 return false; 1078 } 1079 else 1080 { 1081 if (!AddModulesUsingImageInfosAddress (m_dyld_all_image_infos.dylib_info_addr, 1082 m_dyld_all_image_infos.dylib_info_count)) 1083 { 1084 DEBUG_PRINTF("%s", "unable to read all data for all_dylib_infos."); 1085 m_dyld_image_infos.clear(); 1086 } 1087 } 1088 1089 // Now we have one more bit of business. If there is a library left in the images for our target that 1090 // doesn't have a load address, then it must be something that we were expecting to load (for instance we 1091 // read a load command for it) but it didn't in fact load - probably because DYLD_*_PATH pointed 1092 // to an equivalent version. We don't want it to stay in the target's module list or it will confuse 1093 // us, so unload it here. 1094 Target &target = m_process->GetTarget(); 1095 const ModuleList &target_modules = target.GetImages(); 1096 ModuleList not_loaded_modules; 1097 Mutex::Locker modules_locker(target_modules.GetMutex()); 1098 1099 size_t num_modules = target_modules.GetSize(); 1100 for (size_t i = 0; i < num_modules; i++) 1101 { 1102 ModuleSP module_sp = target_modules.GetModuleAtIndexUnlocked (i); 1103 if (!module_sp->IsLoadedInTarget (&target)) 1104 { 1105 if (log) 1106 { 1107 StreamString s; 1108 module_sp->GetDescription (&s); 1109 log->Printf ("Unloading pre-run module: %s.", s.GetData ()); 1110 } 1111 not_loaded_modules.Append (module_sp); 1112 } 1113 } 1114 1115 if (not_loaded_modules.GetSize() != 0) 1116 { 1117 target.GetImages().Remove(not_loaded_modules); 1118 } 1119 1120 return true; 1121 } 1122 else 1123 return false; 1124 } 1125 1126 //---------------------------------------------------------------------- 1127 // Read a mach_header at ADDR into HEADER, and also fill in the load 1128 // command data into LOAD_COMMAND_DATA if it is non-NULL. 1129 // 1130 // Returns true if we succeed, false if we fail for any reason. 1131 //---------------------------------------------------------------------- 1132 bool 1133 DynamicLoaderMacOSXDYLD::ReadMachHeader (lldb::addr_t addr, llvm::MachO::mach_header *header, DataExtractor *load_command_data) 1134 { 1135 DataBufferHeap header_bytes(sizeof(llvm::MachO::mach_header), 0); 1136 Error error; 1137 size_t bytes_read = m_process->ReadMemory (addr, 1138 header_bytes.GetBytes(), 1139 header_bytes.GetByteSize(), 1140 error); 1141 if (bytes_read == sizeof(llvm::MachO::mach_header)) 1142 { 1143 lldb::offset_t offset = 0; 1144 ::memset (header, 0, sizeof(llvm::MachO::mach_header)); 1145 1146 // Get the magic byte unswapped so we can figure out what we are dealing with 1147 DataExtractor data(header_bytes.GetBytes(), header_bytes.GetByteSize(), lldb::endian::InlHostByteOrder(), 4); 1148 header->magic = data.GetU32(&offset); 1149 lldb::addr_t load_cmd_addr = addr; 1150 data.SetByteOrder(DynamicLoaderMacOSXDYLD::GetByteOrderFromMagic(header->magic)); 1151 switch (header->magic) 1152 { 1153 case llvm::MachO::MH_MAGIC: 1154 case llvm::MachO::MH_CIGAM: 1155 data.SetAddressByteSize(4); 1156 load_cmd_addr += sizeof(llvm::MachO::mach_header); 1157 break; 1158 1159 case llvm::MachO::MH_MAGIC_64: 1160 case llvm::MachO::MH_CIGAM_64: 1161 data.SetAddressByteSize(8); 1162 load_cmd_addr += sizeof(llvm::MachO::mach_header_64); 1163 break; 1164 1165 default: 1166 return false; 1167 } 1168 1169 // Read the rest of dyld's mach header 1170 if (data.GetU32(&offset, &header->cputype, (sizeof(llvm::MachO::mach_header)/sizeof(uint32_t)) - 1)) 1171 { 1172 if (load_command_data == NULL) 1173 return true; // We were able to read the mach_header and weren't asked to read the load command bytes 1174 1175 DataBufferSP load_cmd_data_sp(new DataBufferHeap(header->sizeofcmds, 0)); 1176 1177 size_t load_cmd_bytes_read = m_process->ReadMemory (load_cmd_addr, 1178 load_cmd_data_sp->GetBytes(), 1179 load_cmd_data_sp->GetByteSize(), 1180 error); 1181 1182 if (load_cmd_bytes_read == header->sizeofcmds) 1183 { 1184 // Set the load command data and also set the correct endian 1185 // swap settings and the correct address size 1186 load_command_data->SetData(load_cmd_data_sp, 0, header->sizeofcmds); 1187 load_command_data->SetByteOrder(data.GetByteOrder()); 1188 load_command_data->SetAddressByteSize(data.GetAddressByteSize()); 1189 return true; // We successfully read the mach_header and the load command data 1190 } 1191 1192 return false; // We weren't able to read the load command data 1193 } 1194 } 1195 return false; // We failed the read the mach_header 1196 } 1197 1198 1199 //---------------------------------------------------------------------- 1200 // Parse the load commands for an image 1201 //---------------------------------------------------------------------- 1202 uint32_t 1203 DynamicLoaderMacOSXDYLD::ParseLoadCommands (const DataExtractor& data, DYLDImageInfo& dylib_info, FileSpec *lc_id_dylinker) 1204 { 1205 lldb::offset_t offset = 0; 1206 uint32_t cmd_idx; 1207 Segment segment; 1208 dylib_info.Clear (true); 1209 1210 for (cmd_idx = 0; cmd_idx < dylib_info.header.ncmds; cmd_idx++) 1211 { 1212 // Clear out any load command specific data from DYLIB_INFO since 1213 // we are about to read it. 1214 1215 if (data.ValidOffsetForDataOfSize (offset, sizeof(llvm::MachO::load_command))) 1216 { 1217 llvm::MachO::load_command load_cmd; 1218 lldb::offset_t load_cmd_offset = offset; 1219 load_cmd.cmd = data.GetU32 (&offset); 1220 load_cmd.cmdsize = data.GetU32 (&offset); 1221 switch (load_cmd.cmd) 1222 { 1223 case llvm::MachO::LC_SEGMENT: 1224 { 1225 segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16); 1226 // We are putting 4 uint32_t values 4 uint64_t values so 1227 // we have to use multiple 32 bit gets below. 1228 segment.vmaddr = data.GetU32 (&offset); 1229 segment.vmsize = data.GetU32 (&offset); 1230 segment.fileoff = data.GetU32 (&offset); 1231 segment.filesize = data.GetU32 (&offset); 1232 // Extract maxprot, initprot, nsects and flags all at once 1233 data.GetU32(&offset, &segment.maxprot, 4); 1234 dylib_info.segments.push_back (segment); 1235 } 1236 break; 1237 1238 case llvm::MachO::LC_SEGMENT_64: 1239 { 1240 segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16); 1241 // Extract vmaddr, vmsize, fileoff, and filesize all at once 1242 data.GetU64(&offset, &segment.vmaddr, 4); 1243 // Extract maxprot, initprot, nsects and flags all at once 1244 data.GetU32(&offset, &segment.maxprot, 4); 1245 dylib_info.segments.push_back (segment); 1246 } 1247 break; 1248 1249 case llvm::MachO::LC_ID_DYLINKER: 1250 if (lc_id_dylinker) 1251 { 1252 const lldb::offset_t name_offset = load_cmd_offset + data.GetU32 (&offset); 1253 const char *path = data.PeekCStr (name_offset); 1254 lc_id_dylinker->SetFile (path, true); 1255 } 1256 break; 1257 1258 case llvm::MachO::LC_UUID: 1259 dylib_info.uuid.SetBytes(data.GetData (&offset, 16)); 1260 break; 1261 1262 default: 1263 break; 1264 } 1265 // Set offset to be the beginning of the next load command. 1266 offset = load_cmd_offset + load_cmd.cmdsize; 1267 } 1268 } 1269 1270 // All sections listed in the dyld image info structure will all 1271 // either be fixed up already, or they will all be off by a single 1272 // slide amount that is determined by finding the first segment 1273 // that is at file offset zero which also has bytes (a file size 1274 // that is greater than zero) in the object file. 1275 1276 // Determine the slide amount (if any) 1277 const size_t num_sections = dylib_info.segments.size(); 1278 for (size_t i = 0; i < num_sections; ++i) 1279 { 1280 // Iterate through the object file sections to find the 1281 // first section that starts of file offset zero and that 1282 // has bytes in the file... 1283 if (dylib_info.segments[i].fileoff == 0 && dylib_info.segments[i].filesize > 0) 1284 { 1285 dylib_info.slide = dylib_info.address - dylib_info.segments[i].vmaddr; 1286 // We have found the slide amount, so we can exit 1287 // this for loop. 1288 break; 1289 } 1290 } 1291 return cmd_idx; 1292 } 1293 1294 //---------------------------------------------------------------------- 1295 // Read the mach_header and load commands for each image that the 1296 // _dyld_all_image_infos structure points to and cache the results. 1297 //---------------------------------------------------------------------- 1298 1299 void 1300 DynamicLoaderMacOSXDYLD::UpdateImageInfosHeaderAndLoadCommands(DYLDImageInfo::collection &image_infos, 1301 uint32_t infos_count, 1302 bool update_executable) 1303 { 1304 uint32_t exe_idx = UINT32_MAX; 1305 // Read any UUID values that we can get 1306 for (uint32_t i = 0; i < infos_count; i++) 1307 { 1308 if (!image_infos[i].UUIDValid()) 1309 { 1310 DataExtractor data; // Load command data 1311 if (!ReadMachHeader (image_infos[i].address, &image_infos[i].header, &data)) 1312 continue; 1313 1314 ParseLoadCommands (data, image_infos[i], NULL); 1315 1316 if (image_infos[i].header.filetype == llvm::MachO::MH_EXECUTE) 1317 exe_idx = i; 1318 1319 } 1320 } 1321 1322 Target &target = m_process->GetTarget(); 1323 1324 if (exe_idx < image_infos.size()) 1325 { 1326 const bool can_create = true; 1327 ModuleSP exe_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[exe_idx], can_create, NULL)); 1328 1329 if (exe_module_sp) 1330 { 1331 UpdateImageLoadAddress (exe_module_sp.get(), image_infos[exe_idx]); 1332 1333 if (exe_module_sp.get() != target.GetExecutableModulePointer()) 1334 { 1335 // Don't load dependent images since we are in dyld where we will know 1336 // and find out about all images that are loaded. Also when setting the 1337 // executable module, it will clear the targets module list, and if we 1338 // have an in memory dyld module, it will get removed from the list 1339 // so we will need to add it back after setting the executable module, 1340 // so we first try and see if we already have a weak pointer to the 1341 // dyld module, make it into a shared pointer, then add the executable, 1342 // then re-add it back to make sure it is always in the list. 1343 ModuleSP dyld_module_sp(m_dyld_module_wp.lock()); 1344 1345 const bool get_dependent_images = false; 1346 m_process->GetTarget().SetExecutableModule (exe_module_sp, 1347 get_dependent_images); 1348 1349 if (dyld_module_sp) 1350 { 1351 if(target.GetImages().AppendIfNeeded (dyld_module_sp)) 1352 { 1353 // Also add it to the section list. 1354 UpdateImageLoadAddress(dyld_module_sp.get(), m_dyld); 1355 } 1356 } 1357 } 1358 } 1359 } 1360 } 1361 1362 //---------------------------------------------------------------------- 1363 // On Mac OS X libobjc (the Objective-C runtime) has several critical dispatch 1364 // functions written in hand-written assembly, and also have hand-written unwind 1365 // information in the eh_frame section. Normally we prefer analyzing the 1366 // assembly instructions of a currently executing frame to unwind from that frame -- 1367 // but on hand-written functions this profiling can fail. We should use the 1368 // eh_frame instructions for these functions all the time. 1369 // 1370 // As an aside, it would be better if the eh_frame entries had a flag (or were 1371 // extensible so they could have an Apple-specific flag) which indicates that 1372 // the instructions are asynchronous -- accurate at every instruction, instead 1373 // of our normal default assumption that they are not. 1374 //---------------------------------------------------------------------- 1375 1376 bool 1377 DynamicLoaderMacOSXDYLD::AlwaysRelyOnEHUnwindInfo (SymbolContext &sym_ctx) 1378 { 1379 ModuleSP module_sp; 1380 if (sym_ctx.symbol) 1381 { 1382 module_sp = sym_ctx.symbol->GetAddress().GetModule(); 1383 } 1384 if (module_sp.get() == NULL && sym_ctx.function) 1385 { 1386 module_sp = sym_ctx.function->GetAddressRange().GetBaseAddress().GetModule(); 1387 } 1388 if (module_sp.get() == NULL) 1389 return false; 1390 1391 ObjCLanguageRuntime *objc_runtime = m_process->GetObjCLanguageRuntime(); 1392 if (objc_runtime != NULL && objc_runtime->IsModuleObjCLibrary (module_sp)) 1393 { 1394 return true; 1395 } 1396 1397 return false; 1398 } 1399 1400 1401 1402 //---------------------------------------------------------------------- 1403 // Dump a Segment to the file handle provided. 1404 //---------------------------------------------------------------------- 1405 void 1406 DynamicLoaderMacOSXDYLD::Segment::PutToLog (Log *log, lldb::addr_t slide) const 1407 { 1408 if (log) 1409 { 1410 if (slide == 0) 1411 log->Printf ("\t\t%16s [0x%16.16" PRIx64 " - 0x%16.16" PRIx64 ")", 1412 name.AsCString(""), 1413 vmaddr + slide, 1414 vmaddr + slide + vmsize); 1415 else 1416 log->Printf ("\t\t%16s [0x%16.16" PRIx64 " - 0x%16.16" PRIx64 ") slide = 0x%" PRIx64, 1417 name.AsCString(""), 1418 vmaddr + slide, 1419 vmaddr + slide + vmsize, 1420 slide); 1421 } 1422 } 1423 1424 const DynamicLoaderMacOSXDYLD::Segment * 1425 DynamicLoaderMacOSXDYLD::DYLDImageInfo::FindSegment (const ConstString &name) const 1426 { 1427 const size_t num_segments = segments.size(); 1428 for (size_t i=0; i<num_segments; ++i) 1429 { 1430 if (segments[i].name == name) 1431 return &segments[i]; 1432 } 1433 return NULL; 1434 } 1435 1436 1437 //---------------------------------------------------------------------- 1438 // Dump an image info structure to the file handle provided. 1439 //---------------------------------------------------------------------- 1440 void 1441 DynamicLoaderMacOSXDYLD::DYLDImageInfo::PutToLog (Log *log) const 1442 { 1443 if (log == NULL) 1444 return; 1445 uint8_t *u = (uint8_t *)uuid.GetBytes(); 1446 1447 if (address == LLDB_INVALID_ADDRESS) 1448 { 1449 if (u) 1450 { 1451 log->Printf("\t modtime=0x%8.8" PRIx64 " uuid=%2.2X%2.2X%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X path='%s' (UNLOADED)", 1452 mod_date, 1453 u[ 0], u[ 1], u[ 2], u[ 3], 1454 u[ 4], u[ 5], u[ 6], u[ 7], 1455 u[ 8], u[ 9], u[10], u[11], 1456 u[12], u[13], u[14], u[15], 1457 file_spec.GetPath().c_str()); 1458 } 1459 else 1460 log->Printf("\t modtime=0x%8.8" PRIx64 " path='%s' (UNLOADED)", 1461 mod_date, 1462 file_spec.GetPath().c_str()); 1463 } 1464 else 1465 { 1466 if (u) 1467 { 1468 log->Printf("\taddress=0x%16.16" PRIx64 " modtime=0x%8.8" PRIx64 " uuid=%2.2X%2.2X%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X path='%s'", 1469 address, 1470 mod_date, 1471 u[ 0], u[ 1], u[ 2], u[ 3], 1472 u[ 4], u[ 5], u[ 6], u[ 7], 1473 u[ 8], u[ 9], u[10], u[11], 1474 u[12], u[13], u[14], u[15], 1475 file_spec.GetPath().c_str()); 1476 } 1477 else 1478 { 1479 log->Printf("\taddress=0x%16.16" PRIx64 " modtime=0x%8.8" PRIx64 " path='%s'", 1480 address, 1481 mod_date, 1482 file_spec.GetPath().c_str()); 1483 1484 } 1485 for (uint32_t i=0; i<segments.size(); ++i) 1486 segments[i].PutToLog(log, slide); 1487 } 1488 } 1489 1490 //---------------------------------------------------------------------- 1491 // Dump the _dyld_all_image_infos members and all current image infos 1492 // that we have parsed to the file handle provided. 1493 //---------------------------------------------------------------------- 1494 void 1495 DynamicLoaderMacOSXDYLD::PutToLog(Log *log) const 1496 { 1497 if (log == NULL) 1498 return; 1499 1500 Mutex::Locker locker(m_mutex); 1501 log->Printf("dyld_all_image_infos = { version=%d, count=%d, addr=0x%8.8" PRIx64 ", notify=0x%8.8" PRIx64 " }", 1502 m_dyld_all_image_infos.version, 1503 m_dyld_all_image_infos.dylib_info_count, 1504 (uint64_t)m_dyld_all_image_infos.dylib_info_addr, 1505 (uint64_t)m_dyld_all_image_infos.notification); 1506 size_t i; 1507 const size_t count = m_dyld_image_infos.size(); 1508 if (count > 0) 1509 { 1510 log->PutCString("Loaded:"); 1511 for (i = 0; i<count; i++) 1512 m_dyld_image_infos[i].PutToLog(log); 1513 } 1514 } 1515 1516 void 1517 DynamicLoaderMacOSXDYLD::PrivateInitialize(Process *process) 1518 { 1519 DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState())); 1520 Clear(true); 1521 m_process = process; 1522 m_process->GetTarget().ClearAllLoadedSections(); 1523 } 1524 1525 bool 1526 DynamicLoaderMacOSXDYLD::SetNotificationBreakpoint () 1527 { 1528 DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState())); 1529 if (m_break_id == LLDB_INVALID_BREAK_ID) 1530 { 1531 if (m_dyld_all_image_infos.notification != LLDB_INVALID_ADDRESS) 1532 { 1533 Address so_addr; 1534 // Set the notification breakpoint and install a breakpoint 1535 // callback function that will get called each time the 1536 // breakpoint gets hit. We will use this to track when shared 1537 // libraries get loaded/unloaded. 1538 bool resolved = m_process->GetTarget().ResolveLoadAddress(m_dyld_all_image_infos.notification, so_addr); 1539 if (!resolved) 1540 { 1541 ModuleSP dyld_module_sp = m_dyld_module_wp.lock(); 1542 if (dyld_module_sp) 1543 { 1544 UpdateImageLoadAddress (dyld_module_sp.get(), m_dyld); 1545 resolved = m_process->GetTarget().ResolveLoadAddress(m_dyld_all_image_infos.notification, so_addr); 1546 } 1547 } 1548 1549 if (resolved) 1550 { 1551 Breakpoint *dyld_break = m_process->GetTarget().CreateBreakpoint (so_addr, true, false).get(); 1552 dyld_break->SetCallback (DynamicLoaderMacOSXDYLD::NotifyBreakpointHit, this, true); 1553 dyld_break->SetBreakpointKind ("shared-library-event"); 1554 m_break_id = dyld_break->GetID(); 1555 } 1556 } 1557 } 1558 return m_break_id != LLDB_INVALID_BREAK_ID; 1559 } 1560 1561 //---------------------------------------------------------------------- 1562 // Member function that gets called when the process state changes. 1563 //---------------------------------------------------------------------- 1564 void 1565 DynamicLoaderMacOSXDYLD::PrivateProcessStateChanged (Process *process, StateType state) 1566 { 1567 DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s(%s)\n", __FUNCTION__, StateAsCString(state)); 1568 switch (state) 1569 { 1570 case eStateConnected: 1571 case eStateAttaching: 1572 case eStateLaunching: 1573 case eStateInvalid: 1574 case eStateUnloaded: 1575 case eStateExited: 1576 case eStateDetached: 1577 Clear(false); 1578 break; 1579 1580 case eStateStopped: 1581 // Keep trying find dyld and set our notification breakpoint each time 1582 // we stop until we succeed 1583 if (!DidSetNotificationBreakpoint () && m_process->IsAlive()) 1584 { 1585 if (NeedToLocateDYLD ()) 1586 LocateDYLD (); 1587 1588 SetNotificationBreakpoint (); 1589 } 1590 break; 1591 1592 case eStateRunning: 1593 case eStateStepping: 1594 case eStateCrashed: 1595 case eStateSuspended: 1596 break; 1597 } 1598 } 1599 1600 ThreadPlanSP 1601 DynamicLoaderMacOSXDYLD::GetStepThroughTrampolinePlan (Thread &thread, bool stop_others) 1602 { 1603 ThreadPlanSP thread_plan_sp; 1604 StackFrame *current_frame = thread.GetStackFrameAtIndex(0).get(); 1605 const SymbolContext ¤t_context = current_frame->GetSymbolContext(eSymbolContextSymbol); 1606 Symbol *current_symbol = current_context.symbol; 1607 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP)); 1608 TargetSP target_sp (thread.CalculateTarget()); 1609 1610 if (current_symbol != NULL) 1611 { 1612 std::vector<Address> addresses; 1613 1614 if (current_symbol->IsTrampoline()) 1615 { 1616 const ConstString &trampoline_name = current_symbol->GetMangled().GetName(Mangled::ePreferMangled); 1617 1618 if (trampoline_name) 1619 { 1620 const ModuleList &images = target_sp->GetImages(); 1621 1622 SymbolContextList code_symbols; 1623 images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeCode, code_symbols); 1624 size_t num_code_symbols = code_symbols.GetSize(); 1625 1626 if (num_code_symbols > 0) 1627 { 1628 for (uint32_t i = 0; i < num_code_symbols; i++) 1629 { 1630 SymbolContext context; 1631 AddressRange addr_range; 1632 if (code_symbols.GetContextAtIndex(i, context)) 1633 { 1634 context.GetAddressRange (eSymbolContextEverything, 0, false, addr_range); 1635 addresses.push_back(addr_range.GetBaseAddress()); 1636 if (log) 1637 { 1638 addr_t load_addr = addr_range.GetBaseAddress().GetLoadAddress(target_sp.get()); 1639 1640 log->Printf ("Found a trampoline target symbol at 0x%" PRIx64 ".", load_addr); 1641 } 1642 } 1643 } 1644 } 1645 1646 SymbolContextList reexported_symbols; 1647 images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeReExported, reexported_symbols); 1648 size_t num_reexported_symbols = reexported_symbols.GetSize(); 1649 if (num_reexported_symbols > 0) 1650 { 1651 for (uint32_t i = 0; i < num_reexported_symbols; i++) 1652 { 1653 SymbolContext context; 1654 if (reexported_symbols.GetContextAtIndex(i, context)) 1655 { 1656 if (context.symbol) 1657 { 1658 Symbol *actual_symbol = context.symbol->ResolveReExportedSymbol(*target_sp.get()); 1659 if (actual_symbol) 1660 { 1661 if (actual_symbol->GetAddress().IsValid()) 1662 { 1663 addresses.push_back(actual_symbol->GetAddress()); 1664 if (log) 1665 { 1666 lldb::addr_t load_addr = actual_symbol->GetAddress().GetLoadAddress(target_sp.get()); 1667 log->Printf ("Found a re-exported symbol: %s at 0x%" PRIx64 ".", 1668 actual_symbol->GetName().GetCString(), load_addr); 1669 } 1670 } 1671 } 1672 } 1673 } 1674 } 1675 } 1676 1677 SymbolContextList indirect_symbols; 1678 images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeResolver, indirect_symbols); 1679 size_t num_indirect_symbols = indirect_symbols.GetSize(); 1680 if (num_indirect_symbols > 0) 1681 { 1682 for (uint32_t i = 0; i < num_indirect_symbols; i++) 1683 { 1684 SymbolContext context; 1685 AddressRange addr_range; 1686 if (indirect_symbols.GetContextAtIndex(i, context)) 1687 { 1688 context.GetAddressRange (eSymbolContextEverything, 0, false, addr_range); 1689 addresses.push_back(addr_range.GetBaseAddress()); 1690 if (log) 1691 { 1692 addr_t load_addr = addr_range.GetBaseAddress().GetLoadAddress(target_sp.get()); 1693 1694 log->Printf ("Found an indirect target symbol at 0x%" PRIx64 ".", load_addr); 1695 } 1696 } 1697 } 1698 } 1699 } 1700 } 1701 else if (current_symbol->GetType() == eSymbolTypeReExported) 1702 { 1703 // I am not sure we could ever end up stopped AT a re-exported symbol. But just in case: 1704 1705 const Symbol *actual_symbol = current_symbol->ResolveReExportedSymbol(*(target_sp.get())); 1706 if (actual_symbol) 1707 { 1708 Address target_addr(actual_symbol->GetAddress()); 1709 if (target_addr.IsValid()) 1710 { 1711 if (log) 1712 log->Printf ("Found a re-exported symbol: %s pointing to: %s at 0x%" PRIx64 ".", 1713 current_symbol->GetName().GetCString(), 1714 actual_symbol->GetName().GetCString(), 1715 target_addr.GetLoadAddress(target_sp.get())); 1716 addresses.push_back (target_addr.GetLoadAddress(target_sp.get())); 1717 1718 } 1719 } 1720 } 1721 1722 if (addresses.size() > 0) 1723 { 1724 // First check whether any of the addresses point to Indirect symbols, and if they do, resolve them: 1725 std::vector<lldb::addr_t> load_addrs; 1726 for (Address address : addresses) 1727 { 1728 Symbol *symbol = address.CalculateSymbolContextSymbol(); 1729 if (symbol && symbol->IsIndirect()) 1730 { 1731 Error error; 1732 addr_t resolved_addr = thread.GetProcess()->ResolveIndirectFunction(&symbol->GetAddress(), error); 1733 if (error.Success()) 1734 { 1735 load_addrs.push_back(resolved_addr); 1736 if (log) 1737 log->Printf("ResolveIndirectFunction found resolved target for %s at 0x%" PRIx64 ".", 1738 symbol->GetName().GetCString(), resolved_addr); 1739 } 1740 } 1741 else 1742 { 1743 load_addrs.push_back(address.GetLoadAddress(target_sp.get())); 1744 } 1745 1746 } 1747 thread_plan_sp.reset (new ThreadPlanRunToAddress (thread, load_addrs, stop_others)); 1748 } 1749 } 1750 else 1751 { 1752 if (log) 1753 log->Printf ("Could not find symbol for step through."); 1754 } 1755 1756 return thread_plan_sp; 1757 } 1758 1759 size_t 1760 DynamicLoaderMacOSXDYLD::FindEquivalentSymbols (lldb_private::Symbol *original_symbol, 1761 lldb_private::ModuleList &images, 1762 lldb_private::SymbolContextList &equivalent_symbols) 1763 { 1764 const ConstString &trampoline_name = original_symbol->GetMangled().GetName(Mangled::ePreferMangled); 1765 if (!trampoline_name) 1766 return 0; 1767 1768 size_t initial_size = equivalent_symbols.GetSize(); 1769 1770 static const char *resolver_name_regex = "(_gc|_non_gc|\\$[A-Za-z0-9\\$]+)$"; 1771 std::string equivalent_regex_buf("^"); 1772 equivalent_regex_buf.append (trampoline_name.GetCString()); 1773 equivalent_regex_buf.append (resolver_name_regex); 1774 1775 RegularExpression equivalent_name_regex (equivalent_regex_buf.c_str()); 1776 const bool append = true; 1777 images.FindSymbolsMatchingRegExAndType (equivalent_name_regex, eSymbolTypeCode, equivalent_symbols, append); 1778 1779 return equivalent_symbols.GetSize() - initial_size; 1780 } 1781 1782 Error 1783 DynamicLoaderMacOSXDYLD::CanLoadImage () 1784 { 1785 Error error; 1786 // In order for us to tell if we can load a shared library we verify that 1787 // the dylib_info_addr isn't zero (which means no shared libraries have 1788 // been set yet, or dyld is currently mucking with the shared library list). 1789 if (ReadAllImageInfosStructure ()) 1790 { 1791 // TODO: also check the _dyld_global_lock_held variable in libSystem.B.dylib? 1792 // TODO: check the malloc lock? 1793 // TODO: check the objective C lock? 1794 if (m_dyld_all_image_infos.dylib_info_addr != 0) 1795 return error; // Success 1796 } 1797 1798 error.SetErrorString("unsafe to load or unload shared libraries"); 1799 return error; 1800 } 1801 1802 void 1803 DynamicLoaderMacOSXDYLD::Initialize() 1804 { 1805 PluginManager::RegisterPlugin (GetPluginNameStatic(), 1806 GetPluginDescriptionStatic(), 1807 CreateInstance); 1808 } 1809 1810 void 1811 DynamicLoaderMacOSXDYLD::Terminate() 1812 { 1813 PluginManager::UnregisterPlugin (CreateInstance); 1814 } 1815 1816 1817 lldb_private::ConstString 1818 DynamicLoaderMacOSXDYLD::GetPluginNameStatic() 1819 { 1820 static ConstString g_name("macosx-dyld"); 1821 return g_name; 1822 } 1823 1824 const char * 1825 DynamicLoaderMacOSXDYLD::GetPluginDescriptionStatic() 1826 { 1827 return "Dynamic loader plug-in that watches for shared library loads/unloads in MacOSX user processes."; 1828 } 1829 1830 1831 //------------------------------------------------------------------ 1832 // PluginInterface protocol 1833 //------------------------------------------------------------------ 1834 lldb_private::ConstString 1835 DynamicLoaderMacOSXDYLD::GetPluginName() 1836 { 1837 return GetPluginNameStatic(); 1838 } 1839 1840 uint32_t 1841 DynamicLoaderMacOSXDYLD::GetPluginVersion() 1842 { 1843 return 1; 1844 } 1845 1846 uint32_t 1847 DynamicLoaderMacOSXDYLD::AddrByteSize() 1848 { 1849 switch (m_dyld.header.magic) 1850 { 1851 case llvm::MachO::MH_MAGIC: 1852 case llvm::MachO::MH_CIGAM: 1853 return 4; 1854 1855 case llvm::MachO::MH_MAGIC_64: 1856 case llvm::MachO::MH_CIGAM_64: 1857 return 8; 1858 1859 default: 1860 break; 1861 } 1862 return 0; 1863 } 1864 1865 lldb::ByteOrder 1866 DynamicLoaderMacOSXDYLD::GetByteOrderFromMagic (uint32_t magic) 1867 { 1868 switch (magic) 1869 { 1870 case llvm::MachO::MH_MAGIC: 1871 case llvm::MachO::MH_MAGIC_64: 1872 return lldb::endian::InlHostByteOrder(); 1873 1874 case llvm::MachO::MH_CIGAM: 1875 case llvm::MachO::MH_CIGAM_64: 1876 if (lldb::endian::InlHostByteOrder() == lldb::eByteOrderBig) 1877 return lldb::eByteOrderLittle; 1878 else 1879 return lldb::eByteOrderBig; 1880 1881 default: 1882 break; 1883 } 1884 return lldb::eByteOrderInvalid; 1885 } 1886 1887 lldb::ByteOrder 1888 DynamicLoaderMacOSXDYLD::DYLDImageInfo::GetByteOrder() 1889 { 1890 return DynamicLoaderMacOSXDYLD::GetByteOrderFromMagic(header.magic); 1891 } 1892 1893