DynamicLoaderMacOSXDYLD.cpp revision e31176627725f4236c9ca049edc027756709780b
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 "llvm/Support/MachO.h" 12 13#include "lldb/Breakpoint/StoppointCallbackContext.h" 14#include "lldb/Core/DataBuffer.h" 15#include "lldb/Core/DataBufferHeap.h" 16#include "lldb/Core/Log.h" 17#include "lldb/Core/Module.h" 18#include "lldb/Core/PluginManager.h" 19#include "lldb/Core/State.h" 20#include "lldb/Symbol/ObjectFile.h" 21#include "lldb/Target/ObjCLanguageRuntime.h" 22#include "lldb/Target/RegisterContext.h" 23#include "lldb/Target/Target.h" 24#include "lldb/Target/Thread.h" 25#include "lldb/Target/ThreadPlanRunToAddress.h" 26#include "lldb/Target/StackFrame.h" 27 28#include "DynamicLoaderMacOSXDYLD.h" 29 30//#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN 31#ifdef ENABLE_DEBUG_PRINTF 32#include <stdio.h> 33#define DEBUG_PRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__) 34#else 35#define DEBUG_PRINTF(fmt, ...) 36#endif 37 38using namespace lldb; 39using namespace lldb_private; 40 41/// FIXME - The ObjC Runtime trampoline handler doesn't really belong here. 42/// I am putting it here so I can invoke it in the Trampoline code here, but 43/// it should be moved to the ObjC Runtime support when it is set up. 44 45 46DynamicLoaderMacOSXDYLD::DYLDImageInfo * 47DynamicLoaderMacOSXDYLD::GetImageInfo (Module *module) 48{ 49 const UUID &module_uuid = module->GetUUID(); 50 DYLDImageInfo::collection::iterator pos, end = m_dyld_image_infos.end(); 51 52 // First try just by UUID as it is the safest. 53 if (module_uuid.IsValid()) 54 { 55 for (pos = m_dyld_image_infos.begin(); pos != end; ++pos) 56 { 57 if (pos->uuid == module_uuid) 58 return &(*pos); 59 } 60 61 if (m_dyld.uuid == module_uuid) 62 return &m_dyld; 63 } 64 65 // Next try by platform path only for things that don't have a valid UUID 66 // since if a file has a valid UUID in real life it should also in the 67 // dyld info. This is the next safest because the paths in the dyld info 68 // are platform paths, not local paths. For local debugging platform == local 69 // paths. 70 const FileSpec &platform_file_spec = module->GetPlatformFileSpec(); 71 for (pos = m_dyld_image_infos.begin(); pos != end; ++pos) 72 { 73 if (pos->file_spec == platform_file_spec && pos->uuid.IsValid() == false) 74 return &(*pos); 75 } 76 77 if (m_dyld.file_spec == platform_file_spec && m_dyld.uuid.IsValid() == false) 78 return &m_dyld; 79 80 return NULL; 81} 82 83//---------------------------------------------------------------------- 84// Create an instance of this class. This function is filled into 85// the plugin info class that gets handed out by the plugin factory and 86// allows the lldb to instantiate an instance of this class. 87//---------------------------------------------------------------------- 88DynamicLoader * 89DynamicLoaderMacOSXDYLD::CreateInstance (Process* process, bool force) 90{ 91 bool create = force; 92 if (!create) 93 { 94 create = true; 95 Module* exe_module = process->GetTarget().GetExecutableModulePointer(); 96 if (exe_module) 97 { 98 ObjectFile *object_file = exe_module->GetObjectFile(); 99 if (object_file) 100 { 101 create = (object_file->GetStrata() == ObjectFile::eStrataUser); 102 } 103 } 104 105 if (create) 106 { 107 const llvm::Triple &triple_ref = process->GetTarget().GetArchitecture().GetTriple(); 108 create = triple_ref.getOS() == llvm::Triple::Darwin && triple_ref.getVendor() == llvm::Triple::Apple; 109 } 110 } 111 112 if (create) 113 return new DynamicLoaderMacOSXDYLD (process); 114 return NULL; 115} 116 117//---------------------------------------------------------------------- 118// Constructor 119//---------------------------------------------------------------------- 120DynamicLoaderMacOSXDYLD::DynamicLoaderMacOSXDYLD (Process* process) : 121 DynamicLoader(process), 122 m_dyld(), 123 m_dyld_all_image_infos_addr(LLDB_INVALID_ADDRESS), 124 m_dyld_all_image_infos(), 125 m_dyld_all_image_infos_stop_id (UINT32_MAX), 126 m_break_id(LLDB_INVALID_BREAK_ID), 127 m_dyld_image_infos(), 128 m_dyld_image_infos_stop_id (UINT32_MAX), 129 m_mutex(Mutex::eMutexTypeRecursive) 130{ 131} 132 133//---------------------------------------------------------------------- 134// Destructor 135//---------------------------------------------------------------------- 136DynamicLoaderMacOSXDYLD::~DynamicLoaderMacOSXDYLD() 137{ 138 Clear(true); 139} 140 141//------------------------------------------------------------------ 142/// Called after attaching a process. 143/// 144/// Allow DynamicLoader plug-ins to execute some code after 145/// attaching to a process. 146//------------------------------------------------------------------ 147void 148DynamicLoaderMacOSXDYLD::DidAttach () 149{ 150 PrivateInitialize(m_process); 151 LocateDYLD (); 152 SetNotificationBreakpoint (); 153} 154 155//------------------------------------------------------------------ 156/// Called after attaching a process. 157/// 158/// Allow DynamicLoader plug-ins to execute some code after 159/// attaching to a process. 160//------------------------------------------------------------------ 161void 162DynamicLoaderMacOSXDYLD::DidLaunch () 163{ 164 PrivateInitialize(m_process); 165 LocateDYLD (); 166 SetNotificationBreakpoint (); 167} 168 169 170//---------------------------------------------------------------------- 171// Clear out the state of this class. 172//---------------------------------------------------------------------- 173void 174DynamicLoaderMacOSXDYLD::Clear (bool clear_process) 175{ 176 Mutex::Locker locker(m_mutex); 177 178 if (m_process->IsAlive() && LLDB_BREAK_ID_IS_VALID(m_break_id)) 179 m_process->ClearBreakpointSiteByID(m_break_id); 180 181 if (clear_process) 182 m_process = NULL; 183 m_dyld.Clear(false); 184 m_dyld_all_image_infos_addr = LLDB_INVALID_ADDRESS; 185 m_dyld_all_image_infos.Clear(); 186 m_break_id = LLDB_INVALID_BREAK_ID; 187 m_dyld_image_infos.clear(); 188} 189 190//---------------------------------------------------------------------- 191// Check if we have found DYLD yet 192//---------------------------------------------------------------------- 193bool 194DynamicLoaderMacOSXDYLD::DidSetNotificationBreakpoint() const 195{ 196 return LLDB_BREAK_ID_IS_VALID (m_break_id); 197} 198 199//---------------------------------------------------------------------- 200// Try and figure out where dyld is by first asking the Process 201// if it knows (which currently calls down in the the lldb::Process 202// to get the DYLD info (available on SnowLeopard only). If that fails, 203// then check in the default addresses. 204//---------------------------------------------------------------------- 205bool 206DynamicLoaderMacOSXDYLD::LocateDYLD() 207{ 208 if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS) 209 { 210 // Check the image info addr as it might point to the 211 // mach header for dyld, or it might point to the 212 // dyld_all_image_infos struct 213 const addr_t shlib_addr = m_process->GetImageInfoAddress (); 214 215 ByteOrder byte_order = m_process->GetTarget().GetArchitecture().GetByteOrder(); 216 uint8_t buf[4]; 217 DataExtractor data (buf, sizeof(buf), byte_order, 4); 218 Error error; 219 if (m_process->ReadMemory (shlib_addr, buf, 4, error) == 4) 220 { 221 uint32_t offset = 0; 222 uint32_t magic = data.GetU32 (&offset); 223 switch (magic) 224 { 225 case llvm::MachO::HeaderMagic32: 226 case llvm::MachO::HeaderMagic64: 227 case llvm::MachO::HeaderMagic32Swapped: 228 case llvm::MachO::HeaderMagic64Swapped: 229 return ReadDYLDInfoFromMemoryAndSetNotificationCallback(shlib_addr); 230 231 default: 232 break; 233 } 234 } 235 // Maybe it points to the all image infos? 236 m_dyld_all_image_infos_addr = shlib_addr; 237 } 238 239 if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS) 240 { 241 if (ReadAllImageInfosStructure ()) 242 { 243 if (m_dyld_all_image_infos.dyldImageLoadAddress != LLDB_INVALID_ADDRESS) 244 return ReadDYLDInfoFromMemoryAndSetNotificationCallback (m_dyld_all_image_infos.dyldImageLoadAddress); 245 else 246 return ReadDYLDInfoFromMemoryAndSetNotificationCallback (m_dyld_all_image_infos_addr & 0xfffffffffff00000ull); 247 } 248 } 249 250 // Check some default values 251 Module *executable = m_process->GetTarget().GetExecutableModulePointer(); 252 253 if (executable) 254 { 255 const ArchSpec &exe_arch = executable->GetArchitecture(); 256 if (exe_arch.GetAddressByteSize() == 8) 257 { 258 return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x7fff5fc00000ull); 259 } 260 else if (exe_arch.GetMachine() == llvm::Triple::arm || exe_arch.GetMachine() == llvm::Triple::thumb) 261 { 262 return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x2fe00000); 263 } 264 else 265 { 266 return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x8fe00000); 267 } 268 } 269 return false; 270} 271 272ModuleSP 273DynamicLoaderMacOSXDYLD::FindTargetModuleForDYLDImageInfo (const DYLDImageInfo &image_info, bool can_create, bool *did_create_ptr) 274{ 275 if (did_create_ptr) 276 *did_create_ptr = false; 277 ModuleList &target_images = m_process->GetTarget().GetImages(); 278 ModuleSpec module_spec (image_info.file_spec, image_info.GetArchitecture ()); 279 module_spec.GetUUID() = image_info.uuid; 280 ModuleSP module_sp (target_images.FindFirstModule (module_spec)); 281 282 if (module_sp) 283 { 284 // No UUID, we must rely upon the cached module modification 285 // time and the modification time of the file on disk 286 if (module_sp->GetModificationTime() != module_sp->GetFileSpec().GetModificationTime()) 287 module_sp.reset(); 288 } 289 290 if (!module_sp) 291 { 292 if (can_create) 293 { 294 if (!module_sp) 295 { 296 module_sp = m_process->GetTarget().GetSharedModule (module_spec); 297 if (!module_sp || module_sp->GetObjectFile() == NULL) 298 { 299 const bool add_image_to_target = true; 300 const bool load_image_sections_in_target = false; 301 module_sp = m_process->ReadModuleFromMemory (image_info.file_spec, 302 image_info.address, 303 add_image_to_target, 304 load_image_sections_in_target); 305 } 306 307 if (did_create_ptr) 308 *did_create_ptr = module_sp; 309 } 310 } 311 } 312 return module_sp; 313} 314 315//---------------------------------------------------------------------- 316// Assume that dyld is in memory at ADDR and try to parse it's load 317// commands 318//---------------------------------------------------------------------- 319bool 320DynamicLoaderMacOSXDYLD::ReadDYLDInfoFromMemoryAndSetNotificationCallback(lldb::addr_t addr) 321{ 322 DataExtractor data; // Load command data 323 if (ReadMachHeader (addr, &m_dyld.header, &data)) 324 { 325 if (m_dyld.header.filetype == llvm::MachO::HeaderFileTypeDynamicLinkEditor) 326 { 327 m_dyld.address = addr; 328 ModuleSP dyld_module_sp; 329 if (ParseLoadCommands (data, m_dyld, &m_dyld.file_spec)) 330 { 331 if (m_dyld.file_spec) 332 { 333 dyld_module_sp = FindTargetModuleForDYLDImageInfo (m_dyld, true, NULL); 334 335 if (dyld_module_sp) 336 UpdateImageLoadAddress (dyld_module_sp.get(), m_dyld); 337 } 338 } 339 340 if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS && dyld_module_sp.get()) 341 { 342 static ConstString g_dyld_all_image_infos ("dyld_all_image_infos"); 343 const Symbol *symbol = dyld_module_sp->FindFirstSymbolWithNameAndType (g_dyld_all_image_infos, eSymbolTypeData); 344 if (symbol) 345 m_dyld_all_image_infos_addr = symbol->GetAddress().GetLoadAddress(&m_process->GetTarget()); 346 } 347 348 // Update all image infos 349 InitializeFromAllImageInfos (); 350 351 // If we didn't have an executable before, but now we do, then the 352 // dyld module shared pointer might be unique and we may need to add 353 // it again (since Target::SetExecutableModule() will clear the 354 // images). So append the dyld module back to the list if it is 355 /// unique! 356 if (dyld_module_sp && m_process->GetTarget().GetImages().AppendIfNeeded (dyld_module_sp)) 357 UpdateImageLoadAddress(dyld_module_sp.get(), m_dyld); 358 359 return true; 360 } 361 } 362 return false; 363} 364 365bool 366DynamicLoaderMacOSXDYLD::NeedToLocateDYLD () const 367{ 368 return m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS; 369} 370 371bool 372DynamicLoaderMacOSXDYLD::UpdateCommPageLoadAddress(Module *module) 373{ 374 bool changed = false; 375 if (module) 376 { 377 ObjectFile *image_object_file = module->GetObjectFile(); 378 if (image_object_file) 379 { 380 SectionList *section_list = image_object_file->GetSectionList (); 381 if (section_list) 382 { 383 uint32_t num_sections = section_list->GetSize(); 384 for (uint32_t i=0; i<num_sections; ++i) 385 { 386 Section* section = section_list->GetSectionAtIndex (i).get(); 387 if (section) 388 { 389 const addr_t new_section_load_addr = section->GetFileAddress (); 390 const addr_t old_section_load_addr = m_process->GetTarget().GetSectionLoadList().GetSectionLoadAddress (section); 391 if (old_section_load_addr == LLDB_INVALID_ADDRESS || 392 old_section_load_addr != new_section_load_addr) 393 { 394 if (m_process->GetTarget().GetSectionLoadList().SetSectionLoadAddress (section, section->GetFileAddress ())) 395 changed = true; 396 } 397 } 398 } 399 } 400 } 401 } 402 return changed; 403} 404 405//---------------------------------------------------------------------- 406// Update the load addresses for all segments in MODULE using the 407// updated INFO that is passed in. 408//---------------------------------------------------------------------- 409bool 410DynamicLoaderMacOSXDYLD::UpdateImageLoadAddress (Module *module, DYLDImageInfo& info) 411{ 412 bool changed = false; 413 if (module) 414 { 415 ObjectFile *image_object_file = module->GetObjectFile(); 416 if (image_object_file) 417 { 418 SectionList *section_list = image_object_file->GetSectionList (); 419 if (section_list) 420 { 421 std::vector<uint32_t> inaccessible_segment_indexes; 422 // We now know the slide amount, so go through all sections 423 // and update the load addresses with the correct values. 424 uint32_t num_segments = info.segments.size(); 425 for (uint32_t i=0; i<num_segments; ++i) 426 { 427 // Only load a segment if it has protections. Things like 428 // __PAGEZERO don't have any protections, and they shouldn't 429 // be slid 430 SectionSP section_sp(section_list->FindSectionByName(info.segments[i].name)); 431 432 if (info.segments[i].maxprot == 0) 433 { 434 inaccessible_segment_indexes.push_back(i); 435 } 436 else 437 { 438 const addr_t new_section_load_addr = info.segments[i].vmaddr + info.slide; 439 static ConstString g_section_name_LINKEDIT ("__LINKEDIT"); 440 441 if (section_sp) 442 { 443 // Don't ever load any __LINKEDIT sections since the ones in the shared 444 // cached will be coalesced into a single section and we will get warnings 445 // about multiple sections mapping to the same address. 446 if (section_sp->GetName() != g_section_name_LINKEDIT) 447 { 448 const addr_t old_section_load_addr = m_process->GetTarget().GetSectionLoadList().GetSectionLoadAddress (section_sp.get()); 449 if (old_section_load_addr == LLDB_INVALID_ADDRESS || 450 old_section_load_addr != new_section_load_addr) 451 { 452 if (m_process->GetTarget().GetSectionLoadList().SetSectionLoadAddress (section_sp.get(), new_section_load_addr)) 453 changed = true; 454 } 455 } 456 } 457 else 458 { 459 Host::SystemLog (Host::eSystemLogWarning, 460 "warning: unable to find and load segment named '%s' at 0x%llx in '%s/%s' in macosx dynamic loader plug-in.\n", 461 info.segments[i].name.AsCString("<invalid>"), 462 (uint64_t)new_section_load_addr, 463 image_object_file->GetFileSpec().GetDirectory().AsCString(), 464 image_object_file->GetFileSpec().GetFilename().AsCString()); 465 } 466 } 467 } 468 469 // If the loaded the file (it changed) and we have segments that 470 // are not readable or writeable, add them to the invalid memory 471 // region cache for the process. This will typically only be 472 // the __PAGEZERO segment in the main executable. We might be able 473 // to apply this more generally to more sections that have no 474 // protections in the future, but for now we are going to just 475 // do __PAGEZERO. 476 if (changed && !inaccessible_segment_indexes.empty()) 477 { 478 for (uint32_t i=0; i<inaccessible_segment_indexes.size(); ++i) 479 { 480 const uint32_t seg_idx = inaccessible_segment_indexes[i]; 481 SectionSP section_sp(section_list->FindSectionByName(info.segments[seg_idx].name)); 482 483 if (section_sp) 484 { 485 static ConstString g_pagezero_section_name("__PAGEZERO"); 486 if (g_pagezero_section_name == section_sp->GetName()) 487 { 488 // __PAGEZERO never slides... 489 const lldb::addr_t vmaddr = info.segments[seg_idx].vmaddr; 490 const lldb::addr_t vmsize = info.segments[seg_idx].vmsize; 491 Process::LoadRange pagezero_range (vmaddr, vmsize); 492 m_process->AddInvalidMemoryRegion(pagezero_range); 493 } 494 } 495 } 496 } 497 } 498 } 499 } 500 return changed; 501} 502 503//---------------------------------------------------------------------- 504// Update the load addresses for all segments in MODULE using the 505// updated INFO that is passed in. 506//---------------------------------------------------------------------- 507bool 508DynamicLoaderMacOSXDYLD::UnloadImageLoadAddress (Module *module, DYLDImageInfo& info) 509{ 510 bool changed = false; 511 if (module) 512 { 513 ObjectFile *image_object_file = module->GetObjectFile(); 514 if (image_object_file) 515 { 516 SectionList *section_list = image_object_file->GetSectionList (); 517 if (section_list) 518 { 519 uint32_t num_segments = info.segments.size(); 520 for (uint32_t i=0; i<num_segments; ++i) 521 { 522 SectionSP section_sp(section_list->FindSectionByName(info.segments[i].name)); 523 if (section_sp) 524 { 525 const addr_t old_section_load_addr = info.segments[i].vmaddr + info.slide; 526 if (m_process->GetTarget().GetSectionLoadList().SetSectionUnloaded (section_sp.get(), old_section_load_addr)) 527 changed = true; 528 } 529 else 530 { 531 Host::SystemLog (Host::eSystemLogWarning, 532 "warning: unable to find and unload segment named '%s' in '%s/%s' in macosx dynamic loader plug-in.\n", 533 info.segments[i].name.AsCString("<invalid>"), 534 image_object_file->GetFileSpec().GetDirectory().AsCString(), 535 image_object_file->GetFileSpec().GetFilename().AsCString()); 536 } 537 } 538 } 539 } 540 } 541 return changed; 542} 543 544 545//---------------------------------------------------------------------- 546// Static callback function that gets called when our DYLD notification 547// breakpoint gets hit. We update all of our image infos and then 548// let our super class DynamicLoader class decide if we should stop 549// or not (based on global preference). 550//---------------------------------------------------------------------- 551bool 552DynamicLoaderMacOSXDYLD::NotifyBreakpointHit (void *baton, 553 StoppointCallbackContext *context, 554 lldb::user_id_t break_id, 555 lldb::user_id_t break_loc_id) 556{ 557 // Let the event know that the images have changed 558 // DYLD passes three arguments to the notification breakpoint. 559 // Arg1: enum dyld_image_mode mode - 0 = adding, 1 = removing 560 // Arg2: uint32_t infoCount - Number of shared libraries added 561 // Arg3: dyld_image_info info[] - Array of structs of the form: 562 // const struct mach_header *imageLoadAddress 563 // const char *imageFilePath 564 // uintptr_t imageFileModDate (a time_t) 565 566 DynamicLoaderMacOSXDYLD* dyld_instance = (DynamicLoaderMacOSXDYLD*) baton; 567 568 // First step is to see if we've already initialized the all image infos. If we haven't then this function 569 // will do so and return true. In the course of initializing the all_image_infos it will read the complete 570 // current state, so we don't need to figure out what has changed from the data passed in to us. 571 572 if (dyld_instance->InitializeFromAllImageInfos()) 573 return dyld_instance->GetStopWhenImagesChange(); 574 575 ExecutionContext exe_ctx (context->exe_ctx_ref); 576 Process *process = exe_ctx.GetProcessPtr(); 577 const lldb::ABISP &abi = process->GetABI(); 578 if (abi != NULL) 579 { 580 // Build up the value array to store the three arguments given above, then get the values from the ABI: 581 582 ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext(); 583 ValueList argument_values; 584 Value input_value; 585 586 void *clang_void_ptr_type = clang_ast_context->GetVoidPtrType(false); 587 void *clang_uint32_type = clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(lldb::eEncodingUint, 32); 588 input_value.SetValueType (Value::eValueTypeScalar); 589 input_value.SetContext (Value::eContextTypeClangType, clang_uint32_type); 590 argument_values.PushValue(input_value); 591 argument_values.PushValue(input_value); 592 input_value.SetContext (Value::eContextTypeClangType, clang_void_ptr_type); 593 argument_values.PushValue (input_value); 594 595 if (abi->GetArgumentValues (exe_ctx.GetThreadRef(), argument_values)) 596 { 597 uint32_t dyld_mode = argument_values.GetValueAtIndex(0)->GetScalar().UInt (-1); 598 if (dyld_mode != -1) 599 { 600 // Okay the mode was right, now get the number of elements, and the array of new elements... 601 uint32_t image_infos_count = argument_values.GetValueAtIndex(1)->GetScalar().UInt (-1); 602 if (image_infos_count != -1) 603 { 604 // Got the number added, now go through the array of added elements, putting out the mach header 605 // address, and adding the image. 606 // Note, I'm not putting in logging here, since the AddModules & RemoveModules functions do 607 // all the logging internally. 608 609 lldb::addr_t image_infos_addr = argument_values.GetValueAtIndex(2)->GetScalar().ULongLong(); 610 if (dyld_mode == 0) 611 { 612 // This is add: 613 dyld_instance->AddModulesUsingImageInfosAddress (image_infos_addr, image_infos_count); 614 } 615 else 616 { 617 // This is remove: 618 dyld_instance->RemoveModulesUsingImageInfosAddress (image_infos_addr, image_infos_count); 619 } 620 621 } 622 } 623 } 624 } 625 626 // Return true to stop the target, false to just let the target run 627 return dyld_instance->GetStopWhenImagesChange(); 628} 629 630bool 631DynamicLoaderMacOSXDYLD::ReadAllImageInfosStructure () 632{ 633 Mutex::Locker locker(m_mutex); 634 635 // the all image infos is already valid for this process stop ID 636 if (m_process->GetStopID() == m_dyld_all_image_infos_stop_id) 637 return true; 638 639 m_dyld_all_image_infos.Clear(); 640 if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS) 641 { 642 ByteOrder byte_order = m_process->GetTarget().GetArchitecture().GetByteOrder(); 643 uint32_t addr_size = 4; 644 if (m_dyld_all_image_infos_addr > UINT32_MAX) 645 addr_size = 8; 646 647 uint8_t buf[256]; 648 DataExtractor data (buf, sizeof(buf), byte_order, addr_size); 649 uint32_t offset = 0; 650 651 const size_t count_v2 = sizeof (uint32_t) + // version 652 sizeof (uint32_t) + // infoArrayCount 653 addr_size + // infoArray 654 addr_size + // notification 655 addr_size + // processDetachedFromSharedRegion + libSystemInitialized + pad 656 addr_size; // dyldImageLoadAddress 657 const size_t count_v11 = count_v2 + 658 addr_size + // jitInfo 659 addr_size + // dyldVersion 660 addr_size + // errorMessage 661 addr_size + // terminationFlags 662 addr_size + // coreSymbolicationShmPage 663 addr_size + // systemOrderFlag 664 addr_size + // uuidArrayCount 665 addr_size + // uuidArray 666 addr_size + // dyldAllImageInfosAddress 667 addr_size + // initialImageCount 668 addr_size + // errorKind 669 addr_size + // errorClientOfDylibPath 670 addr_size + // errorTargetDylibPath 671 addr_size; // errorSymbol 672 assert (sizeof (buf) >= count_v11); 673 674 int count; 675 Error error; 676 if (m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, 4, error) == 4) 677 { 678 m_dyld_all_image_infos.version = data.GetU32(&offset); 679 // If anything in the high byte is set, we probably got the byte 680 // order incorrect (the process might not have it set correctly 681 // yet due to attaching to a program without a specified file). 682 if (m_dyld_all_image_infos.version & 0xff000000) 683 { 684 // We have guessed the wrong byte order. Swap it and try 685 // reading the version again. 686 if (byte_order == eByteOrderLittle) 687 byte_order = eByteOrderBig; 688 else 689 byte_order = eByteOrderLittle; 690 691 data.SetByteOrder (byte_order); 692 offset = 0; 693 m_dyld_all_image_infos.version = data.GetU32(&offset); 694 } 695 } 696 else 697 { 698 return false; 699 } 700 701 if (m_dyld_all_image_infos.version >= 11) 702 count = count_v11; 703 else 704 count = count_v2; 705 706 const size_t bytes_read = m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, count, error); 707 if (bytes_read == count) 708 { 709 offset = 0; 710 m_dyld_all_image_infos.version = data.GetU32(&offset); 711 m_dyld_all_image_infos.dylib_info_count = data.GetU32(&offset); 712 m_dyld_all_image_infos.dylib_info_addr = data.GetPointer(&offset); 713 m_dyld_all_image_infos.notification = data.GetPointer(&offset); 714 m_dyld_all_image_infos.processDetachedFromSharedRegion = data.GetU8(&offset); 715 m_dyld_all_image_infos.libSystemInitialized = data.GetU8(&offset); 716 // Adjust for padding. 717 offset += addr_size - 2; 718 m_dyld_all_image_infos.dyldImageLoadAddress = data.GetPointer(&offset); 719 if (m_dyld_all_image_infos.version >= 11) 720 { 721 offset += addr_size * 8; 722 uint64_t dyld_all_image_infos_addr = data.GetPointer(&offset); 723 724 // When we started, we were given the actual address of the all_image_infos 725 // struct (probably via TASK_DYLD_INFO) in memory - this address is stored in 726 // m_dyld_all_image_infos_addr and is the most accurate address we have. 727 728 // We read the dyld_all_image_infos struct from memory; it contains its own address. 729 // If the address in the struct does not match the actual address, 730 // the dyld we're looking at has been loaded at a different location (slid) from 731 // where it intended to load. The addresses in the dyld_all_image_infos struct 732 // are the original, non-slid addresses, and need to be adjusted. Most importantly 733 // the address of dyld and the notification address need to be adjusted. 734 735 if (dyld_all_image_infos_addr != m_dyld_all_image_infos_addr) 736 { 737 uint64_t image_infos_offset = dyld_all_image_infos_addr - m_dyld_all_image_infos.dyldImageLoadAddress; 738 uint64_t notification_offset = m_dyld_all_image_infos.notification - m_dyld_all_image_infos.dyldImageLoadAddress; 739 m_dyld_all_image_infos.dyldImageLoadAddress = m_dyld_all_image_infos_addr - image_infos_offset; 740 m_dyld_all_image_infos.notification = m_dyld_all_image_infos.dyldImageLoadAddress + notification_offset; 741 } 742 } 743 m_dyld_all_image_infos_stop_id = m_process->GetStopID(); 744 return true; 745 } 746 } 747 return false; 748} 749 750 751bool 752DynamicLoaderMacOSXDYLD::AddModulesUsingImageInfosAddress (lldb::addr_t image_infos_addr, uint32_t image_infos_count) 753{ 754 DYLDImageInfo::collection image_infos; 755 LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 756 if (log) 757 log->Printf ("Adding %d modules.\n", image_infos_count); 758 759 Mutex::Locker locker(m_mutex); 760 if (m_process->GetStopID() == m_dyld_image_infos_stop_id) 761 return true; 762 763 if (!ReadImageInfos (image_infos_addr, image_infos_count, image_infos)) 764 return false; 765 766 UpdateImageInfosHeaderAndLoadCommands (image_infos, image_infos_count, false); 767 bool return_value = AddModulesUsingImageInfos (image_infos); 768 m_dyld_image_infos_stop_id = m_process->GetStopID(); 769 return return_value; 770} 771 772// Adds the modules in image_infos to m_dyld_image_infos. 773// NB don't call this passing in m_dyld_image_infos. 774 775bool 776DynamicLoaderMacOSXDYLD::AddModulesUsingImageInfos (DYLDImageInfo::collection &image_infos) 777{ 778 // Now add these images to the main list. 779 ModuleList loaded_module_list; 780 LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 781 782 for (uint32_t idx = 0; idx < image_infos.size(); ++idx) 783 { 784 if (log) 785 { 786 log->Printf ("Adding new image at address=0x%16.16llx.", image_infos[idx].address); 787 image_infos[idx].PutToLog (log.get()); 788 } 789 790 m_dyld_image_infos.push_back(image_infos[idx]); 791 792 ModuleSP image_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[idx], true, NULL)); 793 794 if (image_module_sp) 795 { 796 if (image_infos[idx].header.filetype == llvm::MachO::HeaderFileTypeDynamicLinkEditor) 797 image_module_sp->SetIsDynamicLinkEditor (true); 798 799 ObjectFile *objfile = image_module_sp->GetObjectFile (); 800 if (objfile) 801 { 802 SectionList *sections = objfile->GetSectionList(); 803 if (sections) 804 { 805 ConstString commpage_dbstr("__commpage"); 806 Section *commpage_section = sections->FindSectionByName(commpage_dbstr).get(); 807 if (commpage_section) 808 { 809 ModuleList& target_images = m_process->GetTarget().GetImages(); 810 ModuleSpec module_spec (objfile->GetFileSpec(), image_infos[idx].GetArchitecture ()); 811 module_spec.GetObjectName() = commpage_dbstr; 812 ModuleSP commpage_image_module_sp(target_images.FindFirstModule (module_spec)); 813 if (!commpage_image_module_sp) 814 { 815 module_spec.SetObjectOffset (objfile->GetOffset() + commpage_section->GetFileOffset()); 816 commpage_image_module_sp = m_process->GetTarget().GetSharedModule (module_spec); 817 if (!commpage_image_module_sp || commpage_image_module_sp->GetObjectFile() == NULL) 818 { 819 const bool add_image_to_target = true; 820 const bool load_image_sections_in_target = false; 821 commpage_image_module_sp = m_process->ReadModuleFromMemory (image_infos[idx].file_spec, 822 image_infos[idx].address, 823 add_image_to_target, 824 load_image_sections_in_target); 825 } 826 } 827 if (commpage_image_module_sp) 828 UpdateCommPageLoadAddress (commpage_image_module_sp.get()); 829 } 830 } 831 } 832 833 // UpdateImageLoadAddress will return true if any segments 834 // change load address. We need to check this so we don't 835 // mention that all loaded shared libraries are newly loaded 836 // each time we hit out dyld breakpoint since dyld will list all 837 // shared libraries each time. 838 if (UpdateImageLoadAddress (image_module_sp.get(), image_infos[idx])) 839 { 840 loaded_module_list.AppendIfNeeded (image_module_sp); 841 } 842 } 843 } 844 845 if (loaded_module_list.GetSize() > 0) 846 { 847 // FIXME: This should really be in the Runtime handlers class, which should get 848 // called by the target's ModulesDidLoad, but we're doing it all locally for now 849 // to save time. 850 // Also, I'm assuming there can be only one libobjc dylib loaded... 851 852 ObjCLanguageRuntime *objc_runtime = m_process->GetObjCLanguageRuntime(true); 853 if (objc_runtime != NULL && !objc_runtime->HasReadObjCLibrary()) 854 { 855 size_t num_modules = loaded_module_list.GetSize(); 856 for (int i = 0; i < num_modules; i++) 857 { 858 if (objc_runtime->IsModuleObjCLibrary (loaded_module_list.GetModuleAtIndex (i))) 859 { 860 objc_runtime->ReadObjCLibrary (loaded_module_list.GetModuleAtIndex (i)); 861 break; 862 } 863 } 864 } 865 if (log) 866 loaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderMacOSXDYLD::ModulesDidLoad"); 867 m_process->GetTarget().ModulesDidLoad (loaded_module_list); 868 } 869 return true; 870} 871 872bool 873DynamicLoaderMacOSXDYLD::RemoveModulesUsingImageInfosAddress (lldb::addr_t image_infos_addr, uint32_t image_infos_count) 874{ 875 DYLDImageInfo::collection image_infos; 876 LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 877 878 Mutex::Locker locker(m_mutex); 879 if (m_process->GetStopID() == m_dyld_image_infos_stop_id) 880 return true; 881 882 // First read in the image_infos for the removed modules, and their headers & load commands. 883 if (!ReadImageInfos (image_infos_addr, image_infos_count, image_infos)) 884 { 885 if (log) 886 log->PutCString ("Failed reading image infos array."); 887 return false; 888 } 889 890 if (log) 891 log->Printf ("Removing %d modules.", image_infos_count); 892 893 ModuleList unloaded_module_list; 894 for (uint32_t idx = 0; idx < image_infos.size(); ++idx) 895 { 896 if (log) 897 { 898 log->Printf ("Removing module at address=0x%16.16llx.", image_infos[idx].address); 899 image_infos[idx].PutToLog (log.get()); 900 } 901 902 // Remove this image_infos from the m_all_image_infos. We do the comparision by address 903 // rather than by file spec because we can have many modules with the same "file spec" in the 904 // case that they are modules loaded from memory. 905 // 906 // Also copy over the uuid from the old entry to the removed entry so we can 907 // use it to lookup the module in the module list. 908 909 DYLDImageInfo::collection::iterator pos, end = m_dyld_image_infos.end(); 910 for (pos = m_dyld_image_infos.begin(); pos != end; pos++) 911 { 912 if (image_infos[idx].address == (*pos).address) 913 { 914 image_infos[idx].uuid = (*pos).uuid; 915 916 // Add the module from this image_info to the "unloaded_module_list". We'll remove them all at 917 // one go later on. 918 919 ModuleSP unload_image_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[idx], false, NULL)); 920 if (unload_image_module_sp.get()) 921 { 922 // When we unload, be sure to use the image info from the old list, 923 // since that has sections correctly filled in. 924 UnloadImageLoadAddress (unload_image_module_sp.get(), *pos); 925 unloaded_module_list.AppendIfNeeded (unload_image_module_sp); 926 } 927 else 928 { 929 if (log) 930 { 931 log->Printf ("Could not find module for unloading info entry:"); 932 image_infos[idx].PutToLog(log.get()); 933 } 934 } 935 936 // Then remove it from the m_dyld_image_infos: 937 938 m_dyld_image_infos.erase(pos); 939 break; 940 } 941 } 942 943 if (pos == end) 944 { 945 if (log) 946 { 947 log->Printf ("Could not find image_info entry for unloading image:"); 948 image_infos[idx].PutToLog(log.get()); 949 } 950 } 951 } 952 if (unloaded_module_list.GetSize() > 0) 953 { 954 if (log) 955 { 956 log->PutCString("Unloaded:"); 957 unloaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderMacOSXDYLD::ModulesDidUnload"); 958 } 959 m_process->GetTarget().ModulesDidUnload (unloaded_module_list); 960 } 961 m_dyld_image_infos_stop_id = m_process->GetStopID(); 962 return true; 963} 964 965bool 966DynamicLoaderMacOSXDYLD::ReadImageInfos (lldb::addr_t image_infos_addr, 967 uint32_t image_infos_count, 968 DYLDImageInfo::collection &image_infos) 969{ 970 const ByteOrder endian = m_dyld.GetByteOrder(); 971 const uint32_t addr_size = m_dyld.GetAddressByteSize(); 972 973 image_infos.resize(image_infos_count); 974 const size_t count = image_infos.size() * 3 * addr_size; 975 DataBufferHeap info_data(count, 0); 976 Error error; 977 const size_t bytes_read = m_process->ReadMemory (image_infos_addr, 978 info_data.GetBytes(), 979 info_data.GetByteSize(), 980 error); 981 if (bytes_read == count) 982 { 983 uint32_t info_data_offset = 0; 984 DataExtractor info_data_ref(info_data.GetBytes(), info_data.GetByteSize(), endian, addr_size); 985 for (int i = 0; i < image_infos.size() && info_data_ref.ValidOffset(info_data_offset); i++) 986 { 987 image_infos[i].address = info_data_ref.GetPointer(&info_data_offset); 988 lldb::addr_t path_addr = info_data_ref.GetPointer(&info_data_offset); 989 image_infos[i].mod_date = info_data_ref.GetPointer(&info_data_offset); 990 991 char raw_path[PATH_MAX]; 992 m_process->ReadCStringFromMemory (path_addr, raw_path, sizeof(raw_path), error); 993 // don't resolve the path 994 if (error.Success()) 995 { 996 const bool resolve_path = false; 997 image_infos[i].file_spec.SetFile(raw_path, resolve_path); 998 } 999 } 1000 return true; 1001 } 1002 else 1003 { 1004 return false; 1005 } 1006} 1007 1008//---------------------------------------------------------------------- 1009// If we have found where the "_dyld_all_image_infos" lives in memory, 1010// read the current info from it, and then update all image load 1011// addresses (or lack thereof). Only do this if this is the first time 1012// we're reading the dyld infos. Return true if we actually read anything, 1013// and false otherwise. 1014//---------------------------------------------------------------------- 1015bool 1016DynamicLoaderMacOSXDYLD::InitializeFromAllImageInfos () 1017{ 1018 LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 1019 1020 Mutex::Locker locker(m_mutex); 1021 if (m_process->GetStopID() == m_dyld_image_infos_stop_id 1022 || m_dyld_image_infos.size() != 0) 1023 return false; 1024 1025 if (ReadAllImageInfosStructure ()) 1026 { 1027 // Nothing to load or unload? 1028 if (m_dyld_all_image_infos.dylib_info_count == 0) 1029 return true; 1030 1031 if (m_dyld_all_image_infos.dylib_info_addr == 0) 1032 { 1033 // DYLD is updating the images now. So we should say we have no images, and then we'll 1034 // figure it out when we hit the added breakpoint. 1035 return false; 1036 } 1037 else 1038 { 1039 if (!AddModulesUsingImageInfosAddress (m_dyld_all_image_infos.dylib_info_addr, 1040 m_dyld_all_image_infos.dylib_info_count)) 1041 { 1042 DEBUG_PRINTF( "unable to read all data for all_dylib_infos."); 1043 m_dyld_image_infos.clear(); 1044 } 1045 } 1046 1047 // Now we have one more bit of business. If there is a library left in the images for our target that 1048 // doesn't have a load address, then it must be something that we were expecting to load (for instance we 1049 // read a load command for it) but it didn't in fact load - probably because DYLD_*_PATH pointed 1050 // to an equivalent version. We don't want it to stay in the target's module list or it will confuse 1051 // us, so unload it here. 1052 Target &target = m_process->GetTarget(); 1053 ModuleList &modules = target.GetImages(); 1054 ModuleList not_loaded_modules; 1055 size_t num_modules = modules.GetSize(); 1056 for (size_t i = 0; i < num_modules; i++) 1057 { 1058 ModuleSP module_sp = modules.GetModuleAtIndex(i); 1059 if (!module_sp->IsLoadedInTarget (&target)) 1060 { 1061 if (log) 1062 { 1063 StreamString s; 1064 module_sp->GetDescription (&s); 1065 log->Printf ("Unloading pre-run module: %s.", s.GetData ()); 1066 } 1067 not_loaded_modules.Append (module_sp); 1068 } 1069 } 1070 1071 if (not_loaded_modules.GetSize() != 0) 1072 { 1073 target.ModulesDidUnload(not_loaded_modules); 1074 } 1075 1076 return true; 1077 } 1078 else 1079 return false; 1080} 1081 1082//---------------------------------------------------------------------- 1083// Read a mach_header at ADDR into HEADER, and also fill in the load 1084// command data into LOAD_COMMAND_DATA if it is non-NULL. 1085// 1086// Returns true if we succeed, false if we fail for any reason. 1087//---------------------------------------------------------------------- 1088bool 1089DynamicLoaderMacOSXDYLD::ReadMachHeader (lldb::addr_t addr, llvm::MachO::mach_header *header, DataExtractor *load_command_data) 1090{ 1091 DataBufferHeap header_bytes(sizeof(llvm::MachO::mach_header), 0); 1092 Error error; 1093 size_t bytes_read = m_process->ReadMemory (addr, 1094 header_bytes.GetBytes(), 1095 header_bytes.GetByteSize(), 1096 error); 1097 if (bytes_read == sizeof(llvm::MachO::mach_header)) 1098 { 1099 uint32_t offset = 0; 1100 ::memset (header, 0, sizeof(llvm::MachO::mach_header)); 1101 1102 // Get the magic byte unswapped so we can figure out what we are dealing with 1103 DataExtractor data(header_bytes.GetBytes(), header_bytes.GetByteSize(), lldb::endian::InlHostByteOrder(), 4); 1104 header->magic = data.GetU32(&offset); 1105 lldb::addr_t load_cmd_addr = addr; 1106 data.SetByteOrder(DynamicLoaderMacOSXDYLD::GetByteOrderFromMagic(header->magic)); 1107 switch (header->magic) 1108 { 1109 case llvm::MachO::HeaderMagic32: 1110 case llvm::MachO::HeaderMagic32Swapped: 1111 data.SetAddressByteSize(4); 1112 load_cmd_addr += sizeof(llvm::MachO::mach_header); 1113 break; 1114 1115 case llvm::MachO::HeaderMagic64: 1116 case llvm::MachO::HeaderMagic64Swapped: 1117 data.SetAddressByteSize(8); 1118 load_cmd_addr += sizeof(llvm::MachO::mach_header_64); 1119 break; 1120 1121 default: 1122 return false; 1123 } 1124 1125 // Read the rest of dyld's mach header 1126 if (data.GetU32(&offset, &header->cputype, (sizeof(llvm::MachO::mach_header)/sizeof(uint32_t)) - 1)) 1127 { 1128 if (load_command_data == NULL) 1129 return true; // We were able to read the mach_header and weren't asked to read the load command bytes 1130 1131 DataBufferSP load_cmd_data_sp(new DataBufferHeap(header->sizeofcmds, 0)); 1132 1133 size_t load_cmd_bytes_read = m_process->ReadMemory (load_cmd_addr, 1134 load_cmd_data_sp->GetBytes(), 1135 load_cmd_data_sp->GetByteSize(), 1136 error); 1137 1138 if (load_cmd_bytes_read == header->sizeofcmds) 1139 { 1140 // Set the load command data and also set the correct endian 1141 // swap settings and the correct address size 1142 load_command_data->SetData(load_cmd_data_sp, 0, header->sizeofcmds); 1143 load_command_data->SetByteOrder(data.GetByteOrder()); 1144 load_command_data->SetAddressByteSize(data.GetAddressByteSize()); 1145 return true; // We successfully read the mach_header and the load command data 1146 } 1147 1148 return false; // We weren't able to read the load command data 1149 } 1150 } 1151 return false; // We failed the read the mach_header 1152} 1153 1154 1155//---------------------------------------------------------------------- 1156// Parse the load commands for an image 1157//---------------------------------------------------------------------- 1158uint32_t 1159DynamicLoaderMacOSXDYLD::ParseLoadCommands (const DataExtractor& data, DYLDImageInfo& dylib_info, FileSpec *lc_id_dylinker) 1160{ 1161 uint32_t offset = 0; 1162 uint32_t cmd_idx; 1163 Segment segment; 1164 dylib_info.Clear (true); 1165 1166 for (cmd_idx = 0; cmd_idx < dylib_info.header.ncmds; cmd_idx++) 1167 { 1168 // Clear out any load command specific data from DYLIB_INFO since 1169 // we are about to read it. 1170 1171 if (data.ValidOffsetForDataOfSize (offset, sizeof(llvm::MachO::load_command))) 1172 { 1173 llvm::MachO::load_command load_cmd; 1174 uint32_t load_cmd_offset = offset; 1175 load_cmd.cmd = data.GetU32 (&offset); 1176 load_cmd.cmdsize = data.GetU32 (&offset); 1177 switch (load_cmd.cmd) 1178 { 1179 case llvm::MachO::LoadCommandSegment32: 1180 { 1181 segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16); 1182 // We are putting 4 uint32_t values 4 uint64_t values so 1183 // we have to use multiple 32 bit gets below. 1184 segment.vmaddr = data.GetU32 (&offset); 1185 segment.vmsize = data.GetU32 (&offset); 1186 segment.fileoff = data.GetU32 (&offset); 1187 segment.filesize = data.GetU32 (&offset); 1188 // Extract maxprot, initprot, nsects and flags all at once 1189 data.GetU32(&offset, &segment.maxprot, 4); 1190 dylib_info.segments.push_back (segment); 1191 } 1192 break; 1193 1194 case llvm::MachO::LoadCommandSegment64: 1195 { 1196 segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16); 1197 // Extract vmaddr, vmsize, fileoff, and filesize all at once 1198 data.GetU64(&offset, &segment.vmaddr, 4); 1199 // Extract maxprot, initprot, nsects and flags all at once 1200 data.GetU32(&offset, &segment.maxprot, 4); 1201 dylib_info.segments.push_back (segment); 1202 } 1203 break; 1204 1205 case llvm::MachO::LoadCommandDynamicLinkerIdent: 1206 if (lc_id_dylinker) 1207 { 1208 uint32_t name_offset = load_cmd_offset + data.GetU32 (&offset); 1209 const char *path = data.PeekCStr (name_offset); 1210 lc_id_dylinker->SetFile (path, true); 1211 } 1212 break; 1213 1214 case llvm::MachO::LoadCommandUUID: 1215 dylib_info.uuid.SetBytes(data.GetData (&offset, 16)); 1216 break; 1217 1218 default: 1219 break; 1220 } 1221 // Set offset to be the beginning of the next load command. 1222 offset = load_cmd_offset + load_cmd.cmdsize; 1223 } 1224 } 1225 1226 // All sections listed in the dyld image info structure will all 1227 // either be fixed up already, or they will all be off by a single 1228 // slide amount that is determined by finding the first segment 1229 // that is at file offset zero which also has bytes (a file size 1230 // that is greater than zero) in the object file. 1231 1232 // Determine the slide amount (if any) 1233 const size_t num_sections = dylib_info.segments.size(); 1234 for (size_t i = 0; i < num_sections; ++i) 1235 { 1236 // Iterate through the object file sections to find the 1237 // first section that starts of file offset zero and that 1238 // has bytes in the file... 1239 if (dylib_info.segments[i].fileoff == 0 && dylib_info.segments[i].filesize > 0) 1240 { 1241 dylib_info.slide = dylib_info.address - dylib_info.segments[i].vmaddr; 1242 // We have found the slide amount, so we can exit 1243 // this for loop. 1244 break; 1245 } 1246 } 1247 return cmd_idx; 1248} 1249 1250//---------------------------------------------------------------------- 1251// Read the mach_header and load commands for each image that the 1252// _dyld_all_image_infos structure points to and cache the results. 1253//---------------------------------------------------------------------- 1254 1255void 1256DynamicLoaderMacOSXDYLD::UpdateImageInfosHeaderAndLoadCommands(DYLDImageInfo::collection &image_infos, 1257 uint32_t infos_count, 1258 bool update_executable) 1259{ 1260 uint32_t exe_idx = UINT32_MAX; 1261 LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); 1262 // Read any UUID values that we can get 1263 for (uint32_t i = 0; i < infos_count; i++) 1264 { 1265 if (!image_infos[i].UUIDValid()) 1266 { 1267 DataExtractor data; // Load command data 1268 if (!ReadMachHeader (image_infos[i].address, &image_infos[i].header, &data)) 1269 continue; 1270 1271 ParseLoadCommands (data, image_infos[i], NULL); 1272 1273 if (image_infos[i].header.filetype == llvm::MachO::HeaderFileTypeExecutable) 1274 exe_idx = i; 1275 1276 } 1277 } 1278 1279 if (exe_idx < image_infos.size()) 1280 { 1281 const bool can_create = true; 1282 ModuleSP exe_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[exe_idx], can_create, NULL)); 1283 1284 if (!exe_module_sp) 1285 { 1286 ArchSpec exe_arch_spec (image_infos[exe_idx].GetArchitecture ()); 1287 ModuleSpec module_spec (image_infos[exe_idx].file_spec, 1288 image_infos[exe_idx].GetArchitecture ()); 1289 module_spec.GetUUID() = image_infos[exe_idx].uuid; 1290 exe_module_sp = m_process->GetTarget().GetSharedModule (module_spec); 1291 if (!exe_module_sp || exe_module_sp->GetObjectFile() == NULL) 1292 { 1293 const bool add_image_to_target = true; 1294 const bool load_image_sections_in_target = false; 1295 exe_module_sp = m_process->ReadModuleFromMemory (image_infos[exe_idx].file_spec, 1296 image_infos[exe_idx].address, 1297 add_image_to_target, 1298 load_image_sections_in_target); 1299 } 1300 } 1301 1302 if (exe_module_sp) 1303 { 1304 if (exe_module_sp.get() != m_process->GetTarget().GetExecutableModulePointer()) 1305 { 1306 // Don't load dependent images since we are in dyld where we will know 1307 // and find out about all images that are loaded 1308 const bool get_dependent_images = false; 1309 m_process->GetTarget().SetExecutableModule (exe_module_sp, 1310 get_dependent_images); 1311 } 1312 } 1313 } 1314} 1315 1316//---------------------------------------------------------------------- 1317// On Mac OS X libobjc (the Objective-C runtime) has several critical dispatch 1318// functions written in hand-written assembly, and also have hand-written unwind 1319// information in the eh_frame section. Normally we prefer analyzing the 1320// assembly instructions of a curently executing frame to unwind from that frame -- 1321// but on hand-written functions this profiling can fail. We should use the 1322// eh_frame instructions for these functions all the time. 1323// 1324// As an aside, it would be better if the eh_frame entries had a flag (or were 1325// extensible so they could have an Apple-specific flag) which indicates that 1326// the instructions are asynchronous -- accurate at every instruction, instead 1327// of our normal default assumption that they are not. 1328//---------------------------------------------------------------------- 1329 1330bool 1331DynamicLoaderMacOSXDYLD::AlwaysRelyOnEHUnwindInfo (SymbolContext &sym_ctx) 1332{ 1333 ModuleSP module_sp; 1334 if (sym_ctx.symbol) 1335 { 1336 module_sp = sym_ctx.symbol->GetAddress().GetModule(); 1337 } 1338 if (module_sp.get() == NULL && sym_ctx.function) 1339 { 1340 module_sp = sym_ctx.function->GetAddressRange().GetBaseAddress().GetModule(); 1341 } 1342 if (module_sp.get() == NULL) 1343 return false; 1344 1345 ObjCLanguageRuntime *objc_runtime = m_process->GetObjCLanguageRuntime(); 1346 if (objc_runtime != NULL && objc_runtime->IsModuleObjCLibrary (module_sp)) 1347 { 1348 return true; 1349 } 1350 1351 return false; 1352} 1353 1354 1355 1356//---------------------------------------------------------------------- 1357// Dump a Segment to the file handle provided. 1358//---------------------------------------------------------------------- 1359void 1360DynamicLoaderMacOSXDYLD::Segment::PutToLog (Log *log, lldb::addr_t slide) const 1361{ 1362 if (log) 1363 { 1364 if (slide == 0) 1365 log->Printf ("\t\t%16s [0x%16.16llx - 0x%16.16llx)", 1366 name.AsCString(""), 1367 vmaddr + slide, 1368 vmaddr + slide + vmsize); 1369 else 1370 log->Printf ("\t\t%16s [0x%16.16llx - 0x%16.16llx) slide = 0x%llx", 1371 name.AsCString(""), 1372 vmaddr + slide, 1373 vmaddr + slide + vmsize, 1374 slide); 1375 } 1376} 1377 1378const DynamicLoaderMacOSXDYLD::Segment * 1379DynamicLoaderMacOSXDYLD::DYLDImageInfo::FindSegment (const ConstString &name) const 1380{ 1381 const size_t num_segments = segments.size(); 1382 for (size_t i=0; i<num_segments; ++i) 1383 { 1384 if (segments[i].name == name) 1385 return &segments[i]; 1386 } 1387 return NULL; 1388} 1389 1390 1391//---------------------------------------------------------------------- 1392// Dump an image info structure to the file handle provided. 1393//---------------------------------------------------------------------- 1394void 1395DynamicLoaderMacOSXDYLD::DYLDImageInfo::PutToLog (Log *log) const 1396{ 1397 if (log == NULL) 1398 return; 1399 uint8_t *u = (uint8_t *)uuid.GetBytes(); 1400 1401 if (address == LLDB_INVALID_ADDRESS) 1402 { 1403 if (u) 1404 { 1405 log->Printf("\t modtime=0x%8.8llx 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/%s' (UNLOADED)", 1406 mod_date, 1407 u[ 0], u[ 1], u[ 2], u[ 3], 1408 u[ 4], u[ 5], u[ 6], u[ 7], 1409 u[ 8], u[ 9], u[10], u[11], 1410 u[12], u[13], u[14], u[15], 1411 file_spec.GetDirectory().AsCString(), 1412 file_spec.GetFilename().AsCString()); 1413 } 1414 else 1415 log->Printf("\t modtime=0x%8.8llx path='%s/%s' (UNLOADED)", 1416 mod_date, 1417 file_spec.GetDirectory().AsCString(), 1418 file_spec.GetFilename().AsCString()); 1419 } 1420 else 1421 { 1422 if (u) 1423 { 1424 log->Printf("\taddress=0x%16.16llx modtime=0x%8.8llx 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/%s'", 1425 address, 1426 mod_date, 1427 u[ 0], u[ 1], u[ 2], u[ 3], 1428 u[ 4], u[ 5], u[ 6], u[ 7], 1429 u[ 8], u[ 9], u[10], u[11], 1430 u[12], u[13], u[14], u[15], 1431 file_spec.GetDirectory().AsCString(), 1432 file_spec.GetFilename().AsCString()); 1433 } 1434 else 1435 { 1436 log->Printf("\taddress=0x%16.16llx modtime=0x%8.8llx path='%s/%s'", 1437 address, 1438 mod_date, 1439 file_spec.GetDirectory().AsCString(), 1440 file_spec.GetFilename().AsCString()); 1441 1442 } 1443 for (uint32_t i=0; i<segments.size(); ++i) 1444 segments[i].PutToLog(log, slide); 1445 } 1446} 1447 1448//---------------------------------------------------------------------- 1449// Dump the _dyld_all_image_infos members and all current image infos 1450// that we have parsed to the file handle provided. 1451//---------------------------------------------------------------------- 1452void 1453DynamicLoaderMacOSXDYLD::PutToLog(Log *log) const 1454{ 1455 if (log == NULL) 1456 return; 1457 1458 Mutex::Locker locker(m_mutex); 1459 log->Printf("dyld_all_image_infos = { version=%d, count=%d, addr=0x%8.8llx, notify=0x%8.8llx }", 1460 m_dyld_all_image_infos.version, 1461 m_dyld_all_image_infos.dylib_info_count, 1462 (uint64_t)m_dyld_all_image_infos.dylib_info_addr, 1463 (uint64_t)m_dyld_all_image_infos.notification); 1464 size_t i; 1465 const size_t count = m_dyld_image_infos.size(); 1466 if (count > 0) 1467 { 1468 log->PutCString("Loaded:"); 1469 for (i = 0; i<count; i++) 1470 m_dyld_image_infos[i].PutToLog(log); 1471 } 1472} 1473 1474void 1475DynamicLoaderMacOSXDYLD::PrivateInitialize(Process *process) 1476{ 1477 DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState())); 1478 Clear(true); 1479 m_process = process; 1480 m_process->GetTarget().GetSectionLoadList().Clear(); 1481} 1482 1483bool 1484DynamicLoaderMacOSXDYLD::SetNotificationBreakpoint () 1485{ 1486 DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState())); 1487 if (m_break_id == LLDB_INVALID_BREAK_ID) 1488 { 1489 if (m_dyld_all_image_infos.notification != LLDB_INVALID_ADDRESS) 1490 { 1491 Address so_addr; 1492 // Set the notification breakpoint and install a breakpoint 1493 // callback function that will get called each time the 1494 // breakpoint gets hit. We will use this to track when shared 1495 // libraries get loaded/unloaded. 1496 1497 if (m_process->GetTarget().GetSectionLoadList().ResolveLoadAddress(m_dyld_all_image_infos.notification, so_addr)) 1498 { 1499 Breakpoint *dyld_break = m_process->GetTarget().CreateBreakpoint (so_addr, true).get(); 1500 dyld_break->SetCallback (DynamicLoaderMacOSXDYLD::NotifyBreakpointHit, this, true); 1501 m_break_id = dyld_break->GetID(); 1502 } 1503 } 1504 } 1505 return m_break_id != LLDB_INVALID_BREAK_ID; 1506} 1507 1508//---------------------------------------------------------------------- 1509// Member function that gets called when the process state changes. 1510//---------------------------------------------------------------------- 1511void 1512DynamicLoaderMacOSXDYLD::PrivateProcessStateChanged (Process *process, StateType state) 1513{ 1514 DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s(%s)\n", __FUNCTION__, StateAsCString(state)); 1515 switch (state) 1516 { 1517 case eStateConnected: 1518 case eStateAttaching: 1519 case eStateLaunching: 1520 case eStateInvalid: 1521 case eStateUnloaded: 1522 case eStateExited: 1523 case eStateDetached: 1524 Clear(false); 1525 break; 1526 1527 case eStateStopped: 1528 // Keep trying find dyld and set our notification breakpoint each time 1529 // we stop until we succeed 1530 if (!DidSetNotificationBreakpoint () && m_process->IsAlive()) 1531 { 1532 if (NeedToLocateDYLD ()) 1533 LocateDYLD (); 1534 1535 SetNotificationBreakpoint (); 1536 } 1537 break; 1538 1539 case eStateRunning: 1540 case eStateStepping: 1541 case eStateCrashed: 1542 case eStateSuspended: 1543 break; 1544 1545 default: 1546 break; 1547 } 1548} 1549 1550// This bit in the n_desc field of the mach file means that this is a 1551// stub that runs arbitrary code to determine the trampoline target. 1552// We've established a naming convention with the CoreOS folks for the 1553// equivalent symbols they will use for this (which the objc guys didn't follow...) 1554// For now we'll just look for all symbols matching that naming convention... 1555 1556#define MACH_O_N_SYMBOL_RESOLVER 0x100 1557 1558ThreadPlanSP 1559DynamicLoaderMacOSXDYLD::GetStepThroughTrampolinePlan (Thread &thread, bool stop_others) 1560{ 1561 ThreadPlanSP thread_plan_sp; 1562 StackFrame *current_frame = thread.GetStackFrameAtIndex(0).get(); 1563 const SymbolContext ¤t_context = current_frame->GetSymbolContext(eSymbolContextSymbol); 1564 Symbol *current_symbol = current_context.symbol; 1565 LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP)); 1566 1567 if (current_symbol != NULL) 1568 { 1569 if (current_symbol->IsTrampoline()) 1570 { 1571 const ConstString &trampoline_name = current_symbol->GetMangled().GetName(Mangled::ePreferMangled); 1572 1573 if (trampoline_name) 1574 { 1575 SymbolContextList target_symbols; 1576 TargetSP target_sp (thread.CalculateTarget()); 1577 ModuleList &images = target_sp->GetImages(); 1578 1579 images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeCode, target_symbols); 1580 1581 size_t num_original_symbols = target_symbols.GetSize(); 1582 // FIXME: The resolver symbol is only valid in object files. In binaries it is reused for the 1583 // shared library slot number. So we'll have to look this up in the dyld info. 1584 // For now, just turn this off. 1585 1586 // bool orig_is_resolver = (current_symbol->GetFlags() & MACH_O_N_SYMBOL_RESOLVER) == MACH_O_N_SYMBOL_RESOLVER; 1587 bool orig_is_resolver = false; 1588 1589 if (num_original_symbols > 0) 1590 { 1591 // We found symbols that look like they are the targets to our symbol. Now look through the 1592 // modules containing our symbols to see if there are any for our symbol. 1593 1594 ModuleList modules_to_search; 1595 1596 for (size_t i = 0; i < num_original_symbols; i++) 1597 { 1598 SymbolContext sc; 1599 target_symbols.GetContextAtIndex(i, sc); 1600 1601 ModuleSP module_sp (sc.symbol->CalculateSymbolContextModule()); 1602 if (module_sp) 1603 modules_to_search.AppendIfNeeded(module_sp); 1604 } 1605 1606 // If the original stub symbol is a resolver, then we don't want to break on the symbol with the 1607 // original name, but instead on all the symbols it could resolve to since otherwise we would stop 1608 // in the middle of the resolution... 1609 // Note that the stub is not of the resolver type it will point to the equivalent symbol, 1610 // not the original name, so in that case we don't need to do anything. 1611 1612 if (orig_is_resolver) 1613 { 1614 target_symbols.Clear(); 1615 1616 FindEquivalentSymbols (current_symbol, modules_to_search, target_symbols); 1617 } 1618 1619 // FIXME - Make the Run to Address take multiple addresses, and 1620 // run to any of them. 1621 uint32_t num_symbols = target_symbols.GetSize(); 1622 if (num_symbols > 0) 1623 { 1624 std::vector<lldb::addr_t> addresses; 1625 addresses.resize (num_symbols); 1626 for (uint32_t i = 0; i < num_symbols; i++) 1627 { 1628 SymbolContext context; 1629 AddressRange addr_range; 1630 if (target_symbols.GetContextAtIndex(i, context)) 1631 { 1632 context.GetAddressRange (eSymbolContextEverything, 0, false, addr_range); 1633 lldb::addr_t load_addr = addr_range.GetBaseAddress().GetLoadAddress(target_sp.get()); 1634 addresses[i] = load_addr; 1635 } 1636 } 1637 if (addresses.size() > 0) 1638 thread_plan_sp.reset (new ThreadPlanRunToAddress (thread, addresses, stop_others)); 1639 else 1640 { 1641 if (log) 1642 log->Printf ("Couldn't resolve the symbol contexts."); 1643 } 1644 } 1645 else 1646 { 1647 if (log) 1648 { 1649 log->Printf ("Found a resolver stub for: \"%s\" but could not find any symbols it resolves to.", 1650 trampoline_name.AsCString()); 1651 } 1652 } 1653 } 1654 else 1655 { 1656 if (log) 1657 { 1658 log->Printf ("Could not find symbol for trampoline target: \"%s\"", trampoline_name.AsCString()); 1659 } 1660 } 1661 } 1662 } 1663 } 1664 else 1665 { 1666 if (log) 1667 log->Printf ("Could not find symbol for step through."); 1668 } 1669 1670 return thread_plan_sp; 1671} 1672 1673size_t 1674DynamicLoaderMacOSXDYLD::FindEquivalentSymbols (lldb_private::Symbol *original_symbol, 1675 lldb_private::ModuleList &images, 1676 lldb_private::SymbolContextList &equivalent_symbols) 1677{ 1678 const ConstString &trampoline_name = original_symbol->GetMangled().GetName(Mangled::ePreferMangled); 1679 if (!trampoline_name) 1680 return 0; 1681 1682 size_t initial_size = equivalent_symbols.GetSize(); 1683 1684 static const char *resolver_name_regex = "(_gc|_non_gc|\\$[A-Z0-9]+)$"; 1685 std::string equivalent_regex_buf("^"); 1686 equivalent_regex_buf.append (trampoline_name.GetCString()); 1687 equivalent_regex_buf.append (resolver_name_regex); 1688 1689 RegularExpression equivalent_name_regex (equivalent_regex_buf.c_str()); 1690 const bool append = true; 1691 images.FindSymbolsMatchingRegExAndType (equivalent_name_regex, eSymbolTypeCode, equivalent_symbols, append); 1692 1693 return equivalent_symbols.GetSize() - initial_size; 1694} 1695 1696Error 1697DynamicLoaderMacOSXDYLD::CanLoadImage () 1698{ 1699 Error error; 1700 // In order for us to tell if we can load a shared library we verify that 1701 // the dylib_info_addr isn't zero (which means no shared libraries have 1702 // been set yet, or dyld is currently mucking with the shared library list). 1703 if (ReadAllImageInfosStructure ()) 1704 { 1705 // TODO: also check the _dyld_global_lock_held variable in libSystem.B.dylib? 1706 // TODO: check the malloc lock? 1707 // TODO: check the objective C lock? 1708 if (m_dyld_all_image_infos.dylib_info_addr != 0) 1709 return error; // Success 1710 } 1711 1712 error.SetErrorString("unsafe to load or unload shared libraries"); 1713 return error; 1714} 1715 1716void 1717DynamicLoaderMacOSXDYLD::Initialize() 1718{ 1719 PluginManager::RegisterPlugin (GetPluginNameStatic(), 1720 GetPluginDescriptionStatic(), 1721 CreateInstance); 1722} 1723 1724void 1725DynamicLoaderMacOSXDYLD::Terminate() 1726{ 1727 PluginManager::UnregisterPlugin (CreateInstance); 1728} 1729 1730 1731const char * 1732DynamicLoaderMacOSXDYLD::GetPluginNameStatic() 1733{ 1734 return "dynamic-loader.macosx-dyld"; 1735} 1736 1737const char * 1738DynamicLoaderMacOSXDYLD::GetPluginDescriptionStatic() 1739{ 1740 return "Dynamic loader plug-in that watches for shared library loads/unloads in MacOSX user processes."; 1741} 1742 1743 1744//------------------------------------------------------------------ 1745// PluginInterface protocol 1746//------------------------------------------------------------------ 1747const char * 1748DynamicLoaderMacOSXDYLD::GetPluginName() 1749{ 1750 return "DynamicLoaderMacOSXDYLD"; 1751} 1752 1753const char * 1754DynamicLoaderMacOSXDYLD::GetShortPluginName() 1755{ 1756 return GetPluginNameStatic(); 1757} 1758 1759uint32_t 1760DynamicLoaderMacOSXDYLD::GetPluginVersion() 1761{ 1762 return 1; 1763} 1764 1765