| //===-- DynamicLoaderPOSIX.h ------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // C Includes |
| // C++ Includes |
| // Other libraries and framework includes |
| #include "lldb/Core/PluginManager.h" |
| #include "lldb/Core/Log.h" |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/ModuleSpec.h" |
| #include "lldb/Core/Section.h" |
| #include "lldb/Symbol/ObjectFile.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Target/ThreadPlanRunToAddress.h" |
| #include "lldb/Breakpoint/BreakpointLocation.h" |
| |
| #include "AuxVector.h" |
| #include "DynamicLoaderPOSIXDYLD.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| void |
| DynamicLoaderPOSIXDYLD::Initialize() |
| { |
| PluginManager::RegisterPlugin(GetPluginNameStatic(), |
| GetPluginDescriptionStatic(), |
| CreateInstance); |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::Terminate() |
| { |
| } |
| |
| lldb_private::ConstString |
| DynamicLoaderPOSIXDYLD::GetPluginName() |
| { |
| return GetPluginNameStatic(); |
| } |
| |
| lldb_private::ConstString |
| DynamicLoaderPOSIXDYLD::GetPluginNameStatic() |
| { |
| static ConstString g_name("linux-dyld"); |
| return g_name; |
| } |
| |
| const char * |
| DynamicLoaderPOSIXDYLD::GetPluginDescriptionStatic() |
| { |
| return "Dynamic loader plug-in that watches for shared library " |
| "loads/unloads in POSIX processes."; |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::GetPluginCommandHelp(const char *command, Stream *strm) |
| { |
| } |
| |
| uint32_t |
| DynamicLoaderPOSIXDYLD::GetPluginVersion() |
| { |
| return 1; |
| } |
| |
| DynamicLoader * |
| DynamicLoaderPOSIXDYLD::CreateInstance(Process *process, bool force) |
| { |
| bool create = force; |
| if (!create) |
| { |
| const llvm::Triple &triple_ref = process->GetTarget().GetArchitecture().GetTriple(); |
| if (triple_ref.getOS() == llvm::Triple::Linux || |
| triple_ref.getOS() == llvm::Triple::FreeBSD) |
| create = true; |
| } |
| |
| if (create) |
| return new DynamicLoaderPOSIXDYLD (process); |
| return NULL; |
| } |
| |
| DynamicLoaderPOSIXDYLD::DynamicLoaderPOSIXDYLD(Process *process) |
| : DynamicLoader(process), |
| m_rendezvous(process), |
| m_load_offset(LLDB_INVALID_ADDRESS), |
| m_entry_point(LLDB_INVALID_ADDRESS), |
| m_auxv(), |
| m_dyld_bid(LLDB_INVALID_BREAK_ID) |
| { |
| } |
| |
| DynamicLoaderPOSIXDYLD::~DynamicLoaderPOSIXDYLD() |
| { |
| if (m_dyld_bid != LLDB_INVALID_BREAK_ID) |
| { |
| m_process->GetTarget().RemoveBreakpointByID (m_dyld_bid); |
| m_dyld_bid = LLDB_INVALID_BREAK_ID; |
| } |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::DidAttach() |
| { |
| ModuleSP executable; |
| addr_t load_offset; |
| |
| m_auxv.reset(new AuxVector(m_process)); |
| |
| executable = GetTargetExecutable(); |
| load_offset = ComputeLoadOffset(); |
| |
| if (executable.get() && load_offset != LLDB_INVALID_ADDRESS) |
| { |
| ModuleList module_list; |
| module_list.Append(executable); |
| UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, load_offset); |
| LoadAllCurrentModules(); |
| m_process->GetTarget().ModulesDidLoad(module_list); |
| } |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::DidLaunch() |
| { |
| ModuleSP executable; |
| addr_t load_offset; |
| |
| m_auxv.reset(new AuxVector(m_process)); |
| |
| executable = GetTargetExecutable(); |
| load_offset = ComputeLoadOffset(); |
| |
| if (executable.get() && load_offset != LLDB_INVALID_ADDRESS) |
| { |
| ModuleList module_list; |
| module_list.Append(executable); |
| UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, load_offset); |
| ProbeEntry(); |
| m_process->GetTarget().ModulesDidLoad(module_list); |
| } |
| } |
| |
| Error |
| DynamicLoaderPOSIXDYLD::ExecutePluginCommand(Args &command, Stream *strm) |
| { |
| return Error(); |
| } |
| |
| Log * |
| DynamicLoaderPOSIXDYLD::EnablePluginLogging(Stream *strm, Args &command) |
| { |
| return NULL; |
| } |
| |
| Error |
| DynamicLoaderPOSIXDYLD::CanLoadImage() |
| { |
| return Error(); |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::UpdateLoadedSections(ModuleSP module, addr_t link_map_addr, addr_t base_addr) |
| { |
| m_loaded_modules[module] = link_map_addr; |
| |
| UpdateLoadedSectionsCommon(module, base_addr); |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::UnloadSections(const ModuleSP module) |
| { |
| m_loaded_modules.erase(module); |
| |
| UnloadSectionsCommon(module); |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::ProbeEntry() |
| { |
| Breakpoint *entry_break; |
| addr_t entry; |
| |
| if ((entry = GetEntryPoint()) == LLDB_INVALID_ADDRESS) |
| return; |
| |
| entry_break = m_process->GetTarget().CreateBreakpoint(entry, true, false).get(); |
| entry_break->SetCallback(EntryBreakpointHit, this, true); |
| entry_break->SetBreakpointKind("shared-library-event"); |
| } |
| |
| // The runtime linker has run and initialized the rendezvous structure once the |
| // process has hit its entry point. When we hit the corresponding breakpoint we |
| // interrogate the rendezvous structure to get the load addresses of all |
| // dependent modules for the process. Similarly, we can discover the runtime |
| // linker function and setup a breakpoint to notify us of any dynamically loaded |
| // modules (via dlopen). |
| bool |
| DynamicLoaderPOSIXDYLD::EntryBreakpointHit(void *baton, |
| StoppointCallbackContext *context, |
| user_id_t break_id, |
| user_id_t break_loc_id) |
| { |
| DynamicLoaderPOSIXDYLD* dyld_instance; |
| |
| dyld_instance = static_cast<DynamicLoaderPOSIXDYLD*>(baton); |
| dyld_instance->LoadAllCurrentModules(); |
| dyld_instance->SetRendezvousBreakpoint(); |
| return false; // Continue running. |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::SetRendezvousBreakpoint() |
| { |
| addr_t break_addr = m_rendezvous.GetBreakAddress(); |
| Target &target = m_process->GetTarget(); |
| |
| if (m_dyld_bid == LLDB_INVALID_BREAK_ID) |
| { |
| Breakpoint *dyld_break = target.CreateBreakpoint (break_addr, true, false).get(); |
| dyld_break->SetCallback(RendezvousBreakpointHit, this, true); |
| dyld_break->SetBreakpointKind ("shared-library-event"); |
| m_dyld_bid = dyld_break->GetID(); |
| } |
| |
| // Make sure our breakpoint is at the right address. |
| assert (target.GetBreakpointByID(m_dyld_bid)->FindLocationByAddress(break_addr)->GetBreakpoint().GetID() == m_dyld_bid); |
| } |
| |
| bool |
| DynamicLoaderPOSIXDYLD::RendezvousBreakpointHit(void *baton, |
| StoppointCallbackContext *context, |
| user_id_t break_id, |
| user_id_t break_loc_id) |
| { |
| DynamicLoaderPOSIXDYLD* dyld_instance; |
| |
| dyld_instance = static_cast<DynamicLoaderPOSIXDYLD*>(baton); |
| dyld_instance->RefreshModules(); |
| |
| // Return true to stop the target, false to just let the target run. |
| return dyld_instance->GetStopWhenImagesChange(); |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::RefreshModules() |
| { |
| if (!m_rendezvous.Resolve()) |
| return; |
| |
| DYLDRendezvous::iterator I; |
| DYLDRendezvous::iterator E; |
| |
| ModuleList &loaded_modules = m_process->GetTarget().GetImages(); |
| |
| if (m_rendezvous.ModulesDidLoad()) |
| { |
| ModuleList new_modules; |
| |
| E = m_rendezvous.loaded_end(); |
| for (I = m_rendezvous.loaded_begin(); I != E; ++I) |
| { |
| FileSpec file(I->path.c_str(), true); |
| ModuleSP module_sp = LoadModuleAtAddress(file, I->link_addr, I->base_addr); |
| if (module_sp.get()) |
| { |
| loaded_modules.AppendIfNeeded(module_sp); |
| new_modules.Append(module_sp); |
| } |
| } |
| m_process->GetTarget().ModulesDidLoad(new_modules); |
| } |
| |
| if (m_rendezvous.ModulesDidUnload()) |
| { |
| ModuleList old_modules; |
| |
| E = m_rendezvous.unloaded_end(); |
| for (I = m_rendezvous.unloaded_begin(); I != E; ++I) |
| { |
| FileSpec file(I->path.c_str(), true); |
| ModuleSpec module_spec (file); |
| ModuleSP module_sp = |
| loaded_modules.FindFirstModule (module_spec); |
| |
| if (module_sp.get()) |
| { |
| old_modules.Append(module_sp); |
| UnloadSections(module_sp); |
| } |
| } |
| loaded_modules.Remove(old_modules); |
| m_process->GetTarget().ModulesDidUnload(old_modules, false); |
| } |
| } |
| |
| ThreadPlanSP |
| DynamicLoaderPOSIXDYLD::GetStepThroughTrampolinePlan(Thread &thread, bool stop) |
| { |
| ThreadPlanSP thread_plan_sp; |
| |
| StackFrame *frame = thread.GetStackFrameAtIndex(0).get(); |
| const SymbolContext &context = frame->GetSymbolContext(eSymbolContextSymbol); |
| Symbol *sym = context.symbol; |
| |
| if (sym == NULL || !sym->IsTrampoline()) |
| return thread_plan_sp; |
| |
| const ConstString &sym_name = sym->GetMangled().GetName(Mangled::ePreferMangled); |
| if (!sym_name) |
| return thread_plan_sp; |
| |
| SymbolContextList target_symbols; |
| Target &target = thread.GetProcess()->GetTarget(); |
| const ModuleList &images = target.GetImages(); |
| |
| images.FindSymbolsWithNameAndType(sym_name, eSymbolTypeCode, target_symbols); |
| size_t num_targets = target_symbols.GetSize(); |
| if (!num_targets) |
| return thread_plan_sp; |
| |
| typedef std::vector<lldb::addr_t> AddressVector; |
| AddressVector addrs; |
| for (size_t i = 0; i < num_targets; ++i) |
| { |
| SymbolContext context; |
| AddressRange range; |
| if (target_symbols.GetContextAtIndex(i, context)) |
| { |
| context.GetAddressRange(eSymbolContextEverything, 0, false, range); |
| lldb::addr_t addr = range.GetBaseAddress().GetLoadAddress(&target); |
| if (addr != LLDB_INVALID_ADDRESS) |
| addrs.push_back(addr); |
| } |
| } |
| |
| if (addrs.size() > 0) |
| { |
| AddressVector::iterator start = addrs.begin(); |
| AddressVector::iterator end = addrs.end(); |
| |
| std::sort(start, end); |
| addrs.erase(std::unique(start, end), end); |
| thread_plan_sp.reset(new ThreadPlanRunToAddress(thread, addrs, stop)); |
| } |
| |
| return thread_plan_sp; |
| } |
| |
| void |
| DynamicLoaderPOSIXDYLD::LoadAllCurrentModules() |
| { |
| DYLDRendezvous::iterator I; |
| DYLDRendezvous::iterator E; |
| ModuleList module_list; |
| |
| if (!m_rendezvous.Resolve()) |
| { |
| Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); |
| if (log) |
| log->Printf("DynamicLoaderPOSIXDYLD::%s unable to resolve POSIX DYLD rendezvous address", |
| __FUNCTION__); |
| return; |
| } |
| |
| // The rendezvous class doesn't enumerate the main module, so track |
| // that ourselves here. |
| ModuleSP executable = GetTargetExecutable(); |
| m_loaded_modules[executable] = m_rendezvous.GetLinkMapAddress(); |
| |
| |
| for (I = m_rendezvous.begin(), E = m_rendezvous.end(); I != E; ++I) |
| { |
| const char *module_path = I->path.c_str(); |
| FileSpec file(module_path, false); |
| ModuleSP module_sp = LoadModuleAtAddress(file, I->link_addr, I->base_addr); |
| if (module_sp.get()) |
| { |
| module_list.Append(module_sp); |
| } |
| else |
| { |
| Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); |
| if (log) |
| log->Printf("DynamicLoaderPOSIXDYLD::%s failed loading module %s at 0x%" PRIx64, |
| __FUNCTION__, module_path, I->base_addr); |
| } |
| } |
| |
| m_process->GetTarget().ModulesDidLoad(module_list); |
| } |
| |
| addr_t |
| DynamicLoaderPOSIXDYLD::ComputeLoadOffset() |
| { |
| addr_t virt_entry; |
| |
| if (m_load_offset != LLDB_INVALID_ADDRESS) |
| return m_load_offset; |
| |
| if ((virt_entry = GetEntryPoint()) == LLDB_INVALID_ADDRESS) |
| return LLDB_INVALID_ADDRESS; |
| |
| ModuleSP module = m_process->GetTarget().GetExecutableModule(); |
| if (!module) |
| return LLDB_INVALID_ADDRESS; |
| |
| ObjectFile *exe = module->GetObjectFile(); |
| Address file_entry = exe->GetEntryPointAddress(); |
| |
| if (!file_entry.IsValid()) |
| return LLDB_INVALID_ADDRESS; |
| |
| m_load_offset = virt_entry - file_entry.GetFileAddress(); |
| return m_load_offset; |
| } |
| |
| addr_t |
| DynamicLoaderPOSIXDYLD::GetEntryPoint() |
| { |
| if (m_entry_point != LLDB_INVALID_ADDRESS) |
| return m_entry_point; |
| |
| if (m_auxv.get() == NULL) |
| return LLDB_INVALID_ADDRESS; |
| |
| AuxVector::iterator I = m_auxv->FindEntry(AuxVector::AT_ENTRY); |
| |
| if (I == m_auxv->end()) |
| return LLDB_INVALID_ADDRESS; |
| |
| m_entry_point = static_cast<addr_t>(I->value); |
| return m_entry_point; |
| } |
| |
| lldb::addr_t |
| DynamicLoaderPOSIXDYLD::GetThreadLocalData (const lldb::ModuleSP module, const lldb::ThreadSP thread) |
| { |
| auto it = m_loaded_modules.find (module); |
| if (it == m_loaded_modules.end()) |
| return LLDB_INVALID_ADDRESS; |
| |
| addr_t link_map = it->second; |
| if (link_map == LLDB_INVALID_ADDRESS) |
| return LLDB_INVALID_ADDRESS; |
| |
| const DYLDRendezvous::ThreadInfo &metadata = m_rendezvous.GetThreadInfo(); |
| if (!metadata.valid) |
| return LLDB_INVALID_ADDRESS; |
| |
| // Get the thread pointer. |
| addr_t tp = thread->GetThreadPointer (); |
| if (tp == LLDB_INVALID_ADDRESS) |
| return LLDB_INVALID_ADDRESS; |
| |
| // Find the module's modid. |
| int modid_size = 4; // FIXME(spucci): This isn't right for big-endian 64-bit |
| int64_t modid = ReadUnsignedIntWithSizeInBytes (link_map + metadata.modid_offset, modid_size); |
| if (modid == -1) |
| return LLDB_INVALID_ADDRESS; |
| |
| // Lookup the DTV structure for this thread. |
| addr_t dtv_ptr = tp + metadata.dtv_offset; |
| addr_t dtv = ReadPointer (dtv_ptr); |
| if (dtv == LLDB_INVALID_ADDRESS) |
| return LLDB_INVALID_ADDRESS; |
| |
| // Find the TLS block for this module. |
| addr_t dtv_slot = dtv + metadata.dtv_slot_size*modid; |
| addr_t tls_block = ReadPointer (dtv_slot + metadata.tls_offset); |
| |
| Module *mod = module.get(); |
| Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); |
| if (log) |
| log->Printf("DynamicLoaderPOSIXDYLD::Performed TLS lookup: " |
| "module=%s, link_map=0x%" PRIx64 ", tp=0x%" PRIx64 ", modid=%" PRId64 ", tls_block=0x%" PRIx64 "\n", |
| mod->GetObjectName().AsCString(""), link_map, tp, (int64_t)modid, tls_block); |
| |
| return tls_block; |
| } |