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