//===-- DynamicLoaderDarwin.cpp -----------------------------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// #include "lldb/Breakpoint/StoppointCallbackContext.h" #include "lldb/Core/DataBuffer.h" #include "lldb/Core/DataBufferHeap.h" #include "lldb/Core/Debugger.h" #include "lldb/Core/Log.h" #include "lldb/Core/Module.h" #include "lldb/Core/ModuleSpec.h" #include "lldb/Core/PluginManager.h" #include "lldb/Core/Section.h" #include "lldb/Core/State.h" #include "lldb/Expression/DiagnosticManager.h" #include "lldb/Symbol/ClangASTContext.h" #include "lldb/Symbol/Function.h" #include "lldb/Symbol/ObjectFile.h" #include "lldb/Target/ABI.h" #include "lldb/Target/ObjCLanguageRuntime.h" #include "lldb/Target/RegisterContext.h" #include "lldb/Target/StackFrame.h" #include "lldb/Target/Target.h" #include "lldb/Target/Thread.h" #include "lldb/Target/ThreadPlanCallFunction.h" #include "lldb/Target/ThreadPlanRunToAddress.h" #include "DynamicLoaderDarwin.h" //#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN #ifdef ENABLE_DEBUG_PRINTF #include #define DEBUG_PRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__) #else #define DEBUG_PRINTF(fmt, ...) #endif #ifndef __APPLE__ #include "Utility/UuidCompatibility.h" #else #include #endif using namespace lldb; using namespace lldb_private; //---------------------------------------------------------------------- // Constructor //---------------------------------------------------------------------- DynamicLoaderDarwin::DynamicLoaderDarwin (Process* process) : DynamicLoader(process), m_dyld_module_wp(), m_libpthread_module_wp(), m_pthread_getspecific_addr(), m_tid_to_tls_map(), m_dyld_image_infos(), m_dyld_image_infos_stop_id(UINT32_MAX), m_dyld(), m_mutex() { } //---------------------------------------------------------------------- // Destructor //---------------------------------------------------------------------- DynamicLoaderDarwin::~DynamicLoaderDarwin() { } //------------------------------------------------------------------ /// Called after attaching a process. /// /// Allow DynamicLoader plug-ins to execute some code after /// attaching to a process. //------------------------------------------------------------------ void DynamicLoaderDarwin::DidAttach () { PrivateInitialize(m_process); DoInitialImageFetch (); SetNotificationBreakpoint (); } //------------------------------------------------------------------ /// Called after attaching a process. /// /// Allow DynamicLoader plug-ins to execute some code after /// attaching to a process. //------------------------------------------------------------------ void DynamicLoaderDarwin::DidLaunch () { PrivateInitialize(m_process); DoInitialImageFetch (); SetNotificationBreakpoint (); } //---------------------------------------------------------------------- // Clear out the state of this class. //---------------------------------------------------------------------- void DynamicLoaderDarwin::Clear (bool clear_process) { std::lock_guard guard(m_mutex); if (clear_process) m_process = NULL; m_dyld_image_infos.clear(); m_dyld_image_infos_stop_id = UINT32_MAX; m_dyld.Clear(false); } ModuleSP DynamicLoaderDarwin::FindTargetModuleForImageInfo (ImageInfo &image_info, bool can_create, bool *did_create_ptr) { if (did_create_ptr) *did_create_ptr = false; Target &target = m_process->GetTarget(); const ModuleList &target_images = target.GetImages(); ModuleSpec module_spec (image_info.file_spec); module_spec.GetUUID() = image_info.uuid; ModuleSP module_sp (target_images.FindFirstModule (module_spec)); if (module_sp && !module_spec.GetUUID().IsValid() && !module_sp->GetUUID().IsValid()) { // No UUID, we must rely upon the cached module modification // time and the modification time of the file on disk if (module_sp->GetModificationTime() != module_sp->GetFileSpec().GetModificationTime()) module_sp.reset(); } if (!module_sp) { if (can_create) { module_sp = target.GetSharedModule (module_spec); if (!module_sp || module_sp->GetObjectFile() == NULL) module_sp = m_process->ReadModuleFromMemory (image_info.file_spec, image_info.address); if (did_create_ptr) *did_create_ptr = (bool) module_sp; } } return module_sp; } void DynamicLoaderDarwin::UnloadImages (const std::vector &solib_addresses) { std::lock_guard guard(m_mutex); if (m_process->GetStopID() == m_dyld_image_infos_stop_id) return; Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); Target &target = m_process->GetTarget(); if (log) log->Printf ("Removing %" PRId64 " modules.", (uint64_t) solib_addresses.size()); ModuleList unloaded_module_list; for (addr_t solib_addr : solib_addresses) { Address header; if (header.SetLoadAddress (solib_addr, &target)) { if (header.GetOffset() == 0) { ModuleSP module_to_remove (header.GetModule()); if (module_to_remove.get()) { if (log) log->Printf ("Removing module at address 0x%" PRIx64, solib_addr); // remove the sections from the Target UnloadSections (module_to_remove); // add this to the list of modules to remove unloaded_module_list.AppendIfNeeded (module_to_remove); // remove the entry from the m_dyld_image_infos ImageInfo::collection::iterator pos, end = m_dyld_image_infos.end(); for (pos = m_dyld_image_infos.begin(); pos != end; pos++) { if (solib_addr == (*pos).address) { m_dyld_image_infos.erase(pos); break; } } } } } } if (unloaded_module_list.GetSize() > 0) { if (log) { log->PutCString("Unloaded:"); unloaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderDarwin::UnloadModules"); } m_process->GetTarget().GetImages().Remove (unloaded_module_list); m_dyld_image_infos_stop_id = m_process->GetStopID(); } } void DynamicLoaderDarwin::UnloadAllImages () { Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); ModuleList unloaded_modules_list; Target &target = m_process->GetTarget(); const ModuleList &target_modules = target.GetImages(); std::lock_guard guard(target_modules.GetMutex()); size_t num_modules = target_modules.GetSize(); ModuleSP dyld_sp (GetDYLDModule()); for (size_t i = 0; i < num_modules; i++) { ModuleSP module_sp = target_modules.GetModuleAtIndexUnlocked (i); // Don't remove dyld - else we'll lose our breakpoint notifying us about libraries // being re-loaded... if (module_sp.get() != nullptr && module_sp.get() != dyld_sp.get()) { UnloadSections (module_sp); unloaded_modules_list.Append (module_sp); } } if (unloaded_modules_list.GetSize() != 0) { if (log) { log->PutCString("Unloaded:"); unloaded_modules_list.LogUUIDAndPaths (log, "DynamicLoaderDarwin::UnloadAllImages"); } target.GetImages().Remove(unloaded_modules_list); m_dyld_image_infos.clear(); m_dyld_image_infos_stop_id = m_process->GetStopID(); } } //---------------------------------------------------------------------- // Update the load addresses for all segments in MODULE using the // updated INFO that is passed in. //---------------------------------------------------------------------- bool DynamicLoaderDarwin::UpdateImageLoadAddress (Module *module, ImageInfo& info) { bool changed = false; if (module) { ObjectFile *image_object_file = module->GetObjectFile(); if (image_object_file) { SectionList *section_list = image_object_file->GetSectionList (); if (section_list) { std::vector inaccessible_segment_indexes; // We now know the slide amount, so go through all sections // and update the load addresses with the correct values. const size_t num_segments = info.segments.size(); for (size_t i=0; iFindSectionByName(info.segments[i].name)); if (info.segments[i].maxprot == 0) { inaccessible_segment_indexes.push_back(i); } else { const addr_t new_section_load_addr = info.segments[i].vmaddr + info.slide; static ConstString g_section_name_LINKEDIT ("__LINKEDIT"); if (section_sp) { // __LINKEDIT sections from files in the shared cache // can overlap so check to see what the segment name is // and pass "false" so we don't warn of overlapping // "Section" objects, and "true" for all other sections. const bool warn_multiple = section_sp->GetName() != g_section_name_LINKEDIT; changed = m_process->GetTarget().SetSectionLoadAddress (section_sp, new_section_load_addr, warn_multiple); } else { Host::SystemLog (Host::eSystemLogWarning, "warning: unable to find and load segment named '%s' at 0x%" PRIx64 " in '%s' in macosx dynamic loader plug-in.\n", info.segments[i].name.AsCString(""), (uint64_t)new_section_load_addr, image_object_file->GetFileSpec().GetPath().c_str()); } } } // If the loaded the file (it changed) and we have segments that // are not readable or writeable, add them to the invalid memory // region cache for the process. This will typically only be // the __PAGEZERO segment in the main executable. We might be able // to apply this more generally to more sections that have no // protections in the future, but for now we are going to just // do __PAGEZERO. if (changed && !inaccessible_segment_indexes.empty()) { for (uint32_t i=0; iFindSectionByName(info.segments[seg_idx].name)); if (section_sp) { static ConstString g_pagezero_section_name("__PAGEZERO"); if (g_pagezero_section_name == section_sp->GetName()) { // __PAGEZERO never slides... const lldb::addr_t vmaddr = info.segments[seg_idx].vmaddr; const lldb::addr_t vmsize = info.segments[seg_idx].vmsize; Process::LoadRange pagezero_range (vmaddr, vmsize); m_process->AddInvalidMemoryRegion(pagezero_range); } } } } } } } // We might have an in memory image that was loaded as soon as it was created if (info.load_stop_id == m_process->GetStopID()) changed = true; else if (changed) { // Update the stop ID when this library was updated info.load_stop_id = m_process->GetStopID(); } return changed; } //---------------------------------------------------------------------- // Unload the segments in MODULE using the INFO that is passed in. //---------------------------------------------------------------------- bool DynamicLoaderDarwin::UnloadModuleSections (Module *module, ImageInfo& info) { bool changed = false; if (module) { ObjectFile *image_object_file = module->GetObjectFile(); if (image_object_file) { SectionList *section_list = image_object_file->GetSectionList (); if (section_list) { const size_t num_segments = info.segments.size(); for (size_t i=0; iFindSectionByName(info.segments[i].name)); if (section_sp) { const addr_t old_section_load_addr = info.segments[i].vmaddr + info.slide; if (m_process->GetTarget().SetSectionUnloaded (section_sp, old_section_load_addr)) changed = true; } else { Host::SystemLog (Host::eSystemLogWarning, "warning: unable to find and unload segment named '%s' in '%s' in macosx dynamic loader plug-in.\n", info.segments[i].name.AsCString(""), image_object_file->GetFileSpec().GetPath().c_str()); } } } } } return changed; } // Given a JSON dictionary (from debugserver, most likely) of binary images loaded in the inferior // process, add the images to the ImageInfo collection. bool DynamicLoaderDarwin::JSONImageInformationIntoImageInfo (StructuredData::ObjectSP image_details, ImageInfo::collection &image_infos) { StructuredData::ObjectSP images_sp = image_details->GetAsDictionary()->GetValueForKey("images"); if (images_sp.get() == nullptr) return false; image_infos.resize (images_sp->GetAsArray()->GetSize()); for (size_t i = 0; i < image_infos.size(); i++) { StructuredData::ObjectSP image_sp = images_sp->GetAsArray()->GetItemAtIndex(i); if (image_sp.get() == nullptr || image_sp->GetAsDictionary() == nullptr) return false; StructuredData::Dictionary *image = image_sp->GetAsDictionary(); if (image->HasKey("load_address") == false || image->HasKey("pathname") == false || image->HasKey("mod_date") == false || image->HasKey("mach_header") == false || image->GetValueForKey("mach_header")->GetAsDictionary() == nullptr || image->HasKey("segments") == false || image->GetValueForKey("segments")->GetAsArray() == nullptr || image->HasKey("uuid") == false ) { return false; } image_infos[i].address = image->GetValueForKey("load_address")->GetAsInteger()->GetValue(); image_infos[i].mod_date = image->GetValueForKey("mod_date")->GetAsInteger()->GetValue(); image_infos[i].file_spec.SetFile(image->GetValueForKey("pathname")->GetAsString()->GetValue().c_str(), false); StructuredData::Dictionary *mh = image->GetValueForKey("mach_header")->GetAsDictionary(); image_infos[i].header.magic = mh->GetValueForKey("magic")->GetAsInteger()->GetValue(); image_infos[i].header.cputype = mh->GetValueForKey("cputype")->GetAsInteger()->GetValue(); image_infos[i].header.cpusubtype = mh->GetValueForKey("cpusubtype")->GetAsInteger()->GetValue(); image_infos[i].header.filetype = mh->GetValueForKey("filetype")->GetAsInteger()->GetValue(); if (image->HasKey("min_version_os_name")) { std::string os_name = image->GetValueForKey("min_version_os_name")->GetAsString()->GetValue(); if (os_name == "macosx") image_infos[i].os_type = llvm::Triple::MacOSX; else if (os_name == "ios" || os_name == "iphoneos") image_infos[i].os_type = llvm::Triple::IOS; else if (os_name == "tvos") image_infos[i].os_type = llvm::Triple::TvOS; else if (os_name == "watchos") image_infos[i].os_type = llvm::Triple::WatchOS; } if (image->HasKey("min_version_os_sdk")) { image_infos[i].min_version_os_sdk = image->GetValueForKey("min_version_os_sdk")->GetAsString()->GetValue(); } // Fields that aren't used by DynamicLoaderDarwin so debugserver doesn't currently send them // in the reply. if (mh->HasKey("flags")) image_infos[i].header.flags = mh->GetValueForKey("flags")->GetAsInteger()->GetValue(); else image_infos[i].header.flags = 0; if (mh->HasKey("ncmds")) image_infos[i].header.ncmds = mh->GetValueForKey("ncmds")->GetAsInteger()->GetValue(); else image_infos[i].header.ncmds = 0; if (mh->HasKey("sizeofcmds")) image_infos[i].header.sizeofcmds = mh->GetValueForKey("sizeofcmds")->GetAsInteger()->GetValue(); else image_infos[i].header.sizeofcmds = 0; StructuredData::Array *segments = image->GetValueForKey("segments")->GetAsArray(); uint32_t segcount = segments->GetSize(); for (size_t j = 0; j < segcount; j++) { Segment segment; StructuredData::Dictionary *seg = segments->GetItemAtIndex(j)->GetAsDictionary(); segment.name = ConstString(seg->GetValueForKey("name")->GetAsString()->GetValue().c_str()); segment.vmaddr = seg->GetValueForKey("vmaddr")->GetAsInteger()->GetValue(); segment.vmsize = seg->GetValueForKey("vmsize")->GetAsInteger()->GetValue(); segment.fileoff = seg->GetValueForKey("fileoff")->GetAsInteger()->GetValue(); segment.filesize = seg->GetValueForKey("filesize")->GetAsInteger()->GetValue(); segment.maxprot = seg->GetValueForKey("maxprot")->GetAsInteger()->GetValue(); // Fields that aren't used by DynamicLoaderDarwin so debugserver doesn't currently send them // in the reply. if (seg->HasKey("initprot")) segment.initprot = seg->GetValueForKey("initprot")->GetAsInteger()->GetValue(); else segment.initprot = 0; if (seg->HasKey("flags")) segment.flags = seg->GetValueForKey("flags")->GetAsInteger()->GetValue(); else segment.flags = 0; if (seg->HasKey("nsects")) segment.nsects = seg->GetValueForKey("nsects")->GetAsInteger()->GetValue(); else segment.nsects = 0; image_infos[i].segments.push_back (segment); } image_infos[i].uuid.SetFromCString (image->GetValueForKey("uuid")->GetAsString()->GetValue().c_str()); // All sections listed in the dyld image info structure will all // either be fixed up already, or they will all be off by a single // slide amount that is determined by finding the first segment // that is at file offset zero which also has bytes (a file size // that is greater than zero) in the object file. // Determine the slide amount (if any) const size_t num_sections = image_infos[i].segments.size(); for (size_t k = 0; k < num_sections; ++k) { // Iterate through the object file sections to find the // first section that starts of file offset zero and that // has bytes in the file... if ((image_infos[i].segments[k].fileoff == 0 && image_infos[i].segments[k].filesize > 0) || (image_infos[i].segments[k].name == ConstString("__TEXT"))) { image_infos[i].slide = image_infos[i].address - image_infos[i].segments[k].vmaddr; // We have found the slide amount, so we can exit // this for loop. break; } } } return true; } void DynamicLoaderDarwin::UpdateSpecialBinariesFromNewImageInfos (ImageInfo::collection &image_infos) { uint32_t exe_idx = UINT32_MAX; uint32_t dyld_idx = UINT32_MAX; Target &target = m_process->GetTarget(); Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); ConstString g_dyld_sim_filename ("dyld_sim"); ArchSpec target_arch = target.GetArchitecture(); const size_t image_infos_size = image_infos.size(); for (size_t i = 0; i < image_infos_size; i++) { if (image_infos[i].header.filetype == llvm::MachO::MH_DYLINKER) { // In a "simulator" process (an x86 process that is ios/tvos/watchos) // we will have two dyld modules -- a "dyld" that we want to keep track of, // and a "dyld_sim" which we don't need to keep track of here. // If the target is an x86 system and the OS of the dyld binary is // ios/tvos/watchos, then we are looking at dyld_sym. // debugserver has only recently (late 2016) started sending up the // os type for each binary it sees -- so if we don't have an os // type, use a filename check as our next best guess. if (image_infos[i].os_type == llvm::Triple::OSType::UnknownOS) { if (image_infos[i].file_spec.GetFilename() != g_dyld_sim_filename) { dyld_idx = i; } } else if (target_arch.GetTriple().getArch() == llvm::Triple::x86 || target_arch.GetTriple().getArch() == llvm::Triple::x86_64) { if (image_infos[i].os_type != llvm::Triple::OSType::IOS && image_infos[i].os_type != llvm::Triple::TvOS && image_infos[i].os_type != llvm::Triple::WatchOS) { dyld_idx = i; } } } else if (image_infos[i].header.filetype == llvm::MachO::MH_EXECUTE) { exe_idx = i; } } if (exe_idx != UINT32_MAX) { const bool can_create = true; ModuleSP exe_module_sp (FindTargetModuleForImageInfo (image_infos[exe_idx], can_create, NULL)); if (exe_module_sp) { if (log) log->Printf ("Found executable module: %s", exe_module_sp->GetFileSpec().GetPath().c_str()); target.GetImages().AppendIfNeeded (exe_module_sp); UpdateImageLoadAddress (exe_module_sp.get(), image_infos[exe_idx]); if (exe_module_sp.get() != target.GetExecutableModulePointer()) { const bool get_dependent_images = false; target.SetExecutableModule (exe_module_sp, get_dependent_images); } } } if (dyld_idx != UINT32_MAX) { const bool can_create = true; ModuleSP dyld_sp = FindTargetModuleForImageInfo (image_infos[dyld_idx], can_create, NULL); if (dyld_sp.get()) { if (log) log->Printf ("Found dyld module: %s", dyld_sp->GetFileSpec().GetPath().c_str()); target.GetImages().AppendIfNeeded (dyld_sp); UpdateImageLoadAddress (dyld_sp.get(), image_infos[dyld_idx]); SetDYLDModule (dyld_sp); } } } void DynamicLoaderDarwin::UpdateDYLDImageInfoFromNewImageInfo (ImageInfo &image_info) { if (image_info.header.filetype == llvm::MachO::MH_DYLINKER) { const bool can_create = true; ModuleSP dyld_sp = FindTargetModuleForImageInfo (image_info, can_create, NULL); if (dyld_sp.get()) { Target &target = m_process->GetTarget(); target.GetImages().AppendIfNeeded (dyld_sp); UpdateImageLoadAddress (dyld_sp.get(), image_info); SetDYLDModule (dyld_sp); } } } void DynamicLoaderDarwin::SetDYLDModule (lldb::ModuleSP &dyld_module_sp) { m_dyld_module_wp = dyld_module_sp; } ModuleSP DynamicLoaderDarwin::GetDYLDModule () { ModuleSP dyld_sp (m_dyld_module_wp.lock()); return dyld_sp; } bool DynamicLoaderDarwin::AddModulesUsingImageInfos (ImageInfo::collection &image_infos) { std::lock_guard guard(m_mutex); // Now add these images to the main list. ModuleList loaded_module_list; Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); Target &target = m_process->GetTarget(); ModuleList& target_images = target.GetImages(); for (uint32_t idx = 0; idx < image_infos.size(); ++idx) { if (log) { log->Printf ("Adding new image at address=0x%16.16" PRIx64 ".", image_infos[idx].address); image_infos[idx].PutToLog (log); } m_dyld_image_infos.push_back(image_infos[idx]); ModuleSP image_module_sp (FindTargetModuleForImageInfo (image_infos[idx], true, NULL)); if (image_module_sp) { ObjectFile *objfile = image_module_sp->GetObjectFile (); if (objfile) { SectionList *sections = objfile->GetSectionList(); if (sections) { ConstString commpage_dbstr("__commpage"); Section *commpage_section = sections->FindSectionByName(commpage_dbstr).get(); if (commpage_section) { ModuleSpec module_spec (objfile->GetFileSpec(), image_infos[idx].GetArchitecture ()); module_spec.GetObjectName() = commpage_dbstr; ModuleSP commpage_image_module_sp(target_images.FindFirstModule (module_spec)); if (!commpage_image_module_sp) { module_spec.SetObjectOffset (objfile->GetFileOffset() + commpage_section->GetFileOffset()); module_spec.SetObjectSize (objfile->GetByteSize()); commpage_image_module_sp = target.GetSharedModule (module_spec); if (!commpage_image_module_sp || commpage_image_module_sp->GetObjectFile() == NULL) { commpage_image_module_sp = m_process->ReadModuleFromMemory (image_infos[idx].file_spec, image_infos[idx].address); // Always load a memory image right away in the target in case // we end up trying to read the symbol table from memory... The // __LINKEDIT will need to be mapped so we can figure out where // the symbol table bits are... bool changed = false; UpdateImageLoadAddress (commpage_image_module_sp.get(), image_infos[idx]); target.GetImages().Append(commpage_image_module_sp); if (changed) { image_infos[idx].load_stop_id = m_process->GetStopID(); loaded_module_list.AppendIfNeeded (commpage_image_module_sp); } } } } } } // UpdateImageLoadAddress will return true if any segments // change load address. We need to check this so we don't // mention that all loaded shared libraries are newly loaded // each time we hit out dyld breakpoint since dyld will list all // shared libraries each time. if (UpdateImageLoadAddress (image_module_sp.get(), image_infos[idx])) { target_images.AppendIfNeeded(image_module_sp); loaded_module_list.AppendIfNeeded (image_module_sp); } } } if (loaded_module_list.GetSize() > 0) { if (log) loaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderDarwin::ModulesDidLoad"); m_process->GetTarget().ModulesDidLoad (loaded_module_list); } return true; } //---------------------------------------------------------------------- // On Mac OS X libobjc (the Objective-C runtime) has several critical dispatch // functions written in hand-written assembly, and also have hand-written unwind // information in the eh_frame section. Normally we prefer analyzing the // assembly instructions of a currently executing frame to unwind from that frame -- // but on hand-written functions this profiling can fail. We should use the // eh_frame instructions for these functions all the time. // // As an aside, it would be better if the eh_frame entries had a flag (or were // extensible so they could have an Apple-specific flag) which indicates that // the instructions are asynchronous -- accurate at every instruction, instead // of our normal default assumption that they are not. //---------------------------------------------------------------------- bool DynamicLoaderDarwin::AlwaysRelyOnEHUnwindInfo (SymbolContext &sym_ctx) { ModuleSP module_sp; if (sym_ctx.symbol) { module_sp = sym_ctx.symbol->GetAddressRef().GetModule(); } if (module_sp.get() == NULL && sym_ctx.function) { module_sp = sym_ctx.function->GetAddressRange().GetBaseAddress().GetModule(); } if (module_sp.get() == NULL) return false; ObjCLanguageRuntime *objc_runtime = m_process->GetObjCLanguageRuntime(); if (objc_runtime != NULL && objc_runtime->IsModuleObjCLibrary (module_sp)) { return true; } return false; } //---------------------------------------------------------------------- // Dump a Segment to the file handle provided. //---------------------------------------------------------------------- void DynamicLoaderDarwin::Segment::PutToLog (Log *log, lldb::addr_t slide) const { if (log) { if (slide == 0) log->Printf ("\t\t%16s [0x%16.16" PRIx64 " - 0x%16.16" PRIx64 ")", name.AsCString(""), vmaddr + slide, vmaddr + slide + vmsize); else log->Printf ("\t\t%16s [0x%16.16" PRIx64 " - 0x%16.16" PRIx64 ") slide = 0x%" PRIx64, name.AsCString(""), vmaddr + slide, vmaddr + slide + vmsize, slide); } } const DynamicLoaderDarwin::Segment * DynamicLoaderDarwin::ImageInfo::FindSegment (const ConstString &name) const { const size_t num_segments = segments.size(); for (size_t i=0; iPrintf("\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)", mod_date, u[ 0], u[ 1], u[ 2], u[ 3], u[ 4], u[ 5], u[ 6], u[ 7], u[ 8], u[ 9], u[10], u[11], u[12], u[13], u[14], u[15], file_spec.GetPath().c_str()); } else log->Printf("\t modtime=0x%8.8" PRIx64 " path='%s' (UNLOADED)", mod_date, file_spec.GetPath().c_str()); } else { if (u) { 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'", address, mod_date, u[ 0], u[ 1], u[ 2], u[ 3], u[ 4], u[ 5], u[ 6], u[ 7], u[ 8], u[ 9], u[10], u[11], u[12], u[13], u[14], u[15], file_spec.GetPath().c_str()); } else { log->Printf("\taddress=0x%16.16" PRIx64 " modtime=0x%8.8" PRIx64 " path='%s'", address, mod_date, file_spec.GetPath().c_str()); } for (uint32_t i=0; iGetState())); Clear(true); m_process = process; m_process->GetTarget().ClearAllLoadedSections(); } //---------------------------------------------------------------------- // Member function that gets called when the process state changes. //---------------------------------------------------------------------- void DynamicLoaderDarwin::PrivateProcessStateChanged (Process *process, StateType state) { DEBUG_PRINTF("DynamicLoaderDarwin::%s(%s)\n", __FUNCTION__, StateAsCString(state)); switch (state) { case eStateConnected: case eStateAttaching: case eStateLaunching: case eStateInvalid: case eStateUnloaded: case eStateExited: case eStateDetached: Clear(false); break; case eStateStopped: // Keep trying find dyld and set our notification breakpoint each time // we stop until we succeed if (!DidSetNotificationBreakpoint () && m_process->IsAlive()) { if (NeedToDoInitialImageFetch ()) DoInitialImageFetch (); SetNotificationBreakpoint (); } break; case eStateRunning: case eStateStepping: case eStateCrashed: case eStateSuspended: break; } } ThreadPlanSP DynamicLoaderDarwin::GetStepThroughTrampolinePlan (Thread &thread, bool stop_others) { ThreadPlanSP thread_plan_sp; StackFrame *current_frame = thread.GetStackFrameAtIndex(0).get(); const SymbolContext ¤t_context = current_frame->GetSymbolContext(eSymbolContextSymbol); Symbol *current_symbol = current_context.symbol; Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP)); TargetSP target_sp (thread.CalculateTarget()); if (current_symbol != NULL) { std::vector
addresses; if (current_symbol->IsTrampoline()) { const ConstString &trampoline_name = current_symbol->GetMangled().GetName(current_symbol->GetLanguage(), Mangled::ePreferMangled); if (trampoline_name) { const ModuleList &images = target_sp->GetImages(); SymbolContextList code_symbols; images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeCode, code_symbols); size_t num_code_symbols = code_symbols.GetSize(); if (num_code_symbols > 0) { for (uint32_t i = 0; i < num_code_symbols; i++) { SymbolContext context; AddressRange addr_range; if (code_symbols.GetContextAtIndex(i, context)) { context.GetAddressRange (eSymbolContextEverything, 0, false, addr_range); addresses.push_back(addr_range.GetBaseAddress()); if (log) { addr_t load_addr = addr_range.GetBaseAddress().GetLoadAddress(target_sp.get()); log->Printf ("Found a trampoline target symbol at 0x%" PRIx64 ".", load_addr); } } } } SymbolContextList reexported_symbols; images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeReExported, reexported_symbols); size_t num_reexported_symbols = reexported_symbols.GetSize(); if (num_reexported_symbols > 0) { for (uint32_t i = 0; i < num_reexported_symbols; i++) { SymbolContext context; if (reexported_symbols.GetContextAtIndex(i, context)) { if (context.symbol) { Symbol *actual_symbol = context.symbol->ResolveReExportedSymbol(*target_sp.get()); if (actual_symbol) { const Address actual_symbol_addr = actual_symbol->GetAddress(); if (actual_symbol_addr.IsValid()) { addresses.push_back(actual_symbol_addr); if (log) { lldb::addr_t load_addr = actual_symbol_addr.GetLoadAddress(target_sp.get()); log->Printf ("Found a re-exported symbol: %s at 0x%" PRIx64 ".", actual_symbol->GetName().GetCString(), load_addr); } } } } } } } SymbolContextList indirect_symbols; images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeResolver, indirect_symbols); size_t num_indirect_symbols = indirect_symbols.GetSize(); if (num_indirect_symbols > 0) { for (uint32_t i = 0; i < num_indirect_symbols; i++) { SymbolContext context; AddressRange addr_range; if (indirect_symbols.GetContextAtIndex(i, context)) { context.GetAddressRange (eSymbolContextEverything, 0, false, addr_range); addresses.push_back(addr_range.GetBaseAddress()); if (log) { addr_t load_addr = addr_range.GetBaseAddress().GetLoadAddress(target_sp.get()); log->Printf ("Found an indirect target symbol at 0x%" PRIx64 ".", load_addr); } } } } } } else if (current_symbol->GetType() == eSymbolTypeReExported) { // I am not sure we could ever end up stopped AT a re-exported symbol. But just in case: const Symbol *actual_symbol = current_symbol->ResolveReExportedSymbol(*(target_sp.get())); if (actual_symbol) { Address target_addr(actual_symbol->GetAddress()); if (target_addr.IsValid()) { if (log) log->Printf ("Found a re-exported symbol: %s pointing to: %s at 0x%" PRIx64 ".", current_symbol->GetName().GetCString(), actual_symbol->GetName().GetCString(), target_addr.GetLoadAddress(target_sp.get())); addresses.push_back (target_addr.GetLoadAddress(target_sp.get())); } } } if (addresses.size() > 0) { // First check whether any of the addresses point to Indirect symbols, and if they do, resolve them: std::vector load_addrs; for (Address address : addresses) { Symbol *symbol = address.CalculateSymbolContextSymbol(); if (symbol && symbol->IsIndirect()) { Error error; Address symbol_address = symbol->GetAddress(); addr_t resolved_addr = thread.GetProcess()->ResolveIndirectFunction(&symbol_address, error); if (error.Success()) { load_addrs.push_back(resolved_addr); if (log) log->Printf("ResolveIndirectFunction found resolved target for %s at 0x%" PRIx64 ".", symbol->GetName().GetCString(), resolved_addr); } } else { load_addrs.push_back(address.GetLoadAddress(target_sp.get())); } } thread_plan_sp.reset (new ThreadPlanRunToAddress (thread, load_addrs, stop_others)); } } else { if (log) log->Printf ("Could not find symbol for step through."); } return thread_plan_sp; } size_t DynamicLoaderDarwin::FindEquivalentSymbols (lldb_private::Symbol *original_symbol, lldb_private::ModuleList &images, lldb_private::SymbolContextList &equivalent_symbols) { const ConstString &trampoline_name = original_symbol->GetMangled().GetName(original_symbol->GetLanguage(), Mangled::ePreferMangled); if (!trampoline_name) return 0; size_t initial_size = equivalent_symbols.GetSize(); static const char *resolver_name_regex = "(_gc|_non_gc|\\$[A-Za-z0-9\\$]+)$"; std::string equivalent_regex_buf("^"); equivalent_regex_buf.append (trampoline_name.GetCString()); equivalent_regex_buf.append (resolver_name_regex); RegularExpression equivalent_name_regex (equivalent_regex_buf.c_str()); const bool append = true; images.FindSymbolsMatchingRegExAndType (equivalent_name_regex, eSymbolTypeCode, equivalent_symbols, append); return equivalent_symbols.GetSize() - initial_size; } lldb::ModuleSP DynamicLoaderDarwin::GetPThreadLibraryModule() { ModuleSP module_sp = m_libpthread_module_wp.lock(); if (!module_sp) { SymbolContextList sc_list; ModuleSpec module_spec; module_spec.GetFileSpec().GetFilename().SetCString("libsystem_pthread.dylib"); ModuleList module_list; if (m_process->GetTarget().GetImages().FindModules(module_spec, module_list)) { if (module_list.GetSize() == 1) { module_sp = module_list.GetModuleAtIndex(0); if (module_sp) m_libpthread_module_wp = module_sp; } } } return module_sp; } Address DynamicLoaderDarwin::GetPthreadSetSpecificAddress() { if (!m_pthread_getspecific_addr.IsValid()) { ModuleSP module_sp = GetPThreadLibraryModule(); if (module_sp) { lldb_private::SymbolContextList sc_list; module_sp->FindSymbolsWithNameAndType(ConstString("pthread_getspecific"), eSymbolTypeCode, sc_list); SymbolContext sc; if (sc_list.GetContextAtIndex(0, sc)) { if (sc.symbol) m_pthread_getspecific_addr = sc.symbol->GetAddress(); } } } return m_pthread_getspecific_addr; } lldb::addr_t DynamicLoaderDarwin::GetThreadLocalData(const lldb::ModuleSP module_sp, const lldb::ThreadSP thread_sp, lldb::addr_t tls_file_addr) { if (!thread_sp || !module_sp) return LLDB_INVALID_ADDRESS; std::lock_guard guard(m_mutex); const uint32_t addr_size = m_process->GetAddressByteSize(); uint8_t buf[sizeof(lldb::addr_t) * 3]; lldb_private::Address tls_addr; if (module_sp->ResolveFileAddress(tls_file_addr, tls_addr)) { Error error; const size_t tsl_data_size = addr_size * 3; Target &target = m_process->GetTarget(); if (target.ReadMemory(tls_addr, false, buf, tsl_data_size, error) == tsl_data_size) { const ByteOrder byte_order = m_process->GetByteOrder(); DataExtractor data(buf, sizeof(buf), byte_order, addr_size); lldb::offset_t offset = addr_size; // Skip the first pointer const lldb::addr_t pthread_key = data.GetAddress(&offset); const lldb::addr_t tls_offset = data.GetAddress(&offset); if (pthread_key != 0) { // First check to see if we have already figured out the location // of TLS data for the pthread_key on a specific thread yet. If we // have we can re-use it since its location will not change unless // the process execs. const tid_t tid = thread_sp->GetID(); auto tid_pos = m_tid_to_tls_map.find(tid); if (tid_pos != m_tid_to_tls_map.end()) { auto tls_pos = tid_pos->second.find(pthread_key); if (tls_pos != tid_pos->second.end()) { return tls_pos->second + tls_offset; } } StackFrameSP frame_sp = thread_sp->GetStackFrameAtIndex(0); if (frame_sp) { ClangASTContext *clang_ast_context = target.GetScratchClangASTContext(); if (!clang_ast_context) return LLDB_INVALID_ADDRESS; CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); Address pthread_getspecific_addr = GetPthreadSetSpecificAddress(); if (pthread_getspecific_addr.IsValid()) { EvaluateExpressionOptions options; lldb::ThreadPlanSP thread_plan_sp( new ThreadPlanCallFunction(*thread_sp, pthread_getspecific_addr, clang_void_ptr_type, llvm::ArrayRef(pthread_key), options)); DiagnosticManager execution_errors; ExecutionContext exe_ctx(thread_sp); lldb::ExpressionResults results = m_process->RunThreadPlan(exe_ctx, thread_plan_sp, options, execution_errors); if (results == lldb::eExpressionCompleted) { lldb::ValueObjectSP result_valobj_sp = thread_plan_sp->GetReturnValueObject(); if (result_valobj_sp) { const lldb::addr_t pthread_key_data = result_valobj_sp->GetValueAsUnsigned(0); if (pthread_key_data) { m_tid_to_tls_map[tid].insert(std::make_pair(pthread_key, pthread_key_data)); return pthread_key_data + tls_offset; } } } } } } } } return LLDB_INVALID_ADDRESS; } bool DynamicLoaderDarwin::UseDYLDSPI (Process *process) { Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); uint32_t major, minor, update; bool use_new_spi_interface = false; if (process->GetHostOSVersion (major, minor, update)) { const llvm::Triple::OSType os_type = process->GetTarget().GetArchitecture().GetTriple().getOS(); // macOS 10.12 and newer if (os_type == llvm::Triple::MacOSX && (major >= 10 || (major == 10 && minor >= 12))) { use_new_spi_interface = true; } // iOS 10 and newer if (os_type == llvm::Triple::IOS && major >= 10) { use_new_spi_interface = true; } // tvOS 10 and newer if (os_type == llvm::Triple::TvOS && major >= 10) { use_new_spi_interface = true; } // watchOS 3 and newer if (os_type == llvm::Triple::WatchOS && major >= 3) { use_new_spi_interface = true; } } // FIXME: Temporarily force the use of the old DynamicLoader plugin until all // the different use cases have been tested & the updated SPIs are available // everywhere. use_new_spi_interface = false; if (log) { if (use_new_spi_interface) log->Printf ("DynamicLoaderDarwin::UseDYLDSPI: Use new DynamicLoader plugin"); else log->Printf ("DynamicLoaderDarwin::UseDYLDSPI: Use old DynamicLoader plugin"); } return use_new_spi_interface; }