diff options
Diffstat (limited to 'lldb/source/Plugins/DynamicLoader/Linux-DYLD/DynamicLoaderLinuxDYLD.cpp')
| -rw-r--r-- | lldb/source/Plugins/DynamicLoader/Linux-DYLD/DynamicLoaderLinuxDYLD.cpp | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/lldb/source/Plugins/DynamicLoader/Linux-DYLD/DynamicLoaderLinuxDYLD.cpp b/lldb/source/Plugins/DynamicLoader/Linux-DYLD/DynamicLoaderLinuxDYLD.cpp new file mode 100644 index 00000000000..0802ff65575 --- /dev/null +++ b/lldb/source/Plugins/DynamicLoader/Linux-DYLD/DynamicLoaderLinuxDYLD.cpp @@ -0,0 +1,371 @@ +//===-- DynamicLoaderLinux.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 +#include <iostream> + +// Other libraries and framework includes +#include "lldb/Core/PluginManager.h" +#include "lldb/Core/Log.h" +#include "lldb/Target/Process.h" +#include "lldb/Target/Target.h" + +#include "AuxVector.h" +#include "DynamicLoaderLinuxDYLD.h" + +using namespace lldb; +using namespace lldb_private; + +void +DynamicLoaderLinuxDYLD::Initialize() +{ + PluginManager::RegisterPlugin(GetPluginNameStatic(), + GetPluginDescriptionStatic(), + CreateInstance); +} + +void +DynamicLoaderLinuxDYLD::Terminate() +{ +} + +const char * +DynamicLoaderLinuxDYLD::GetPluginName() +{ + return "DynamicLoaderLinuxDYLD"; +} + +const char * +DynamicLoaderLinuxDYLD::GetShortPluginName() +{ + return "linux-dyld"; +} + +const char * +DynamicLoaderLinuxDYLD::GetPluginNameStatic() +{ + return "dynamic-loader.linux-dyld"; +} + +const char * +DynamicLoaderLinuxDYLD::GetPluginDescriptionStatic() +{ + return "Dynamic loader plug-in that watches for shared library " + "loads/unloads in Linux processes."; +} + +void +DynamicLoaderLinuxDYLD::GetPluginCommandHelp(const char *command, Stream *strm) +{ +} + +uint32_t +DynamicLoaderLinuxDYLD::GetPluginVersion() +{ + return 1; +} + +DynamicLoader * +DynamicLoaderLinuxDYLD::CreateInstance(Process *process) +{ + return new DynamicLoaderLinuxDYLD(process); +} + +DynamicLoaderLinuxDYLD::DynamicLoaderLinuxDYLD(Process *process) + : DynamicLoader(process), + m_rendezvous(process), + m_load_offset(LLDB_INVALID_ADDRESS), + m_entry_point(LLDB_INVALID_ADDRESS), + m_auxv(NULL) +{ +} + +DynamicLoaderLinuxDYLD::~DynamicLoaderLinuxDYLD() +{ +} + +void +DynamicLoaderLinuxDYLD::DidAttach() +{ + ModuleSP executable; + addr_t load_offset; + + m_auxv.reset(new AuxVector(m_process)); + + executable = m_process->GetTarget().GetExecutableModule(); + load_offset = ComputeLoadOffset(); + + if (!executable.empty() && load_offset != LLDB_INVALID_ADDRESS) + { + ModuleList module_list; + module_list.Append(executable); + UpdateLoadedSections(executable, load_offset); + m_process->GetTarget().ModulesDidLoad(module_list); + } +} + +void +DynamicLoaderLinuxDYLD::DidLaunch() +{ + ModuleSP executable; + addr_t load_offset; + + m_auxv.reset(new AuxVector(m_process)); + + executable = m_process->GetTarget().GetExecutableModule(); + load_offset = ComputeLoadOffset(); + + if (!executable.empty() && load_offset != LLDB_INVALID_ADDRESS) + { + ModuleList module_list; + module_list.Append(executable); + UpdateLoadedSections(executable, load_offset); + ProbeEntry(); + m_process->GetTarget().ModulesDidLoad(module_list); + } +} + +Error +DynamicLoaderLinuxDYLD::ExecutePluginCommand(Args &command, Stream *strm) +{ + return Error(); +} + +Log * +DynamicLoaderLinuxDYLD::EnablePluginLogging(Stream *strm, Args &command) +{ + return NULL; +} + +Error +DynamicLoaderLinuxDYLD::CanLoadImage() +{ + return Error(); +} + +void +DynamicLoaderLinuxDYLD::UpdateLoadedSections(ModuleSP module, addr_t base_addr) +{ + ObjectFile *obj_file = module->GetObjectFile(); + SectionList *sections = obj_file->GetSectionList(); + SectionLoadList &load_list = m_process->GetTarget().GetSectionLoadList(); + const size_t num_sections = sections->GetSize(); + + for (unsigned i = 0; i < num_sections; ++i) + { + Section *section = sections->GetSectionAtIndex(i).get(); + lldb::addr_t new_load_addr = section->GetFileAddress() + base_addr; + lldb::addr_t old_load_addr = load_list.GetSectionLoadAddress(section); + + // If the file address of the section is zero then this is not an + // allocatable/loadable section (property of ELF sh_addr). Skip it. + if (new_load_addr == base_addr) + continue; + + if (old_load_addr == LLDB_INVALID_ADDRESS || + old_load_addr != new_load_addr) + load_list.SetSectionLoadAddress(section, new_load_addr); + } +} + +void +DynamicLoaderLinuxDYLD::ProbeEntry() +{ + Breakpoint *entry_break; + addr_t entry; + + if ((entry = GetEntryPoint()) == LLDB_INVALID_ADDRESS) + return; + + entry_break = m_process->GetTarget().CreateBreakpoint(entry, true).get(); + entry_break->SetCallback(EntryBreakpointHit, this, true); +} + +// 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 +DynamicLoaderLinuxDYLD::EntryBreakpointHit(void *baton, + StoppointCallbackContext *context, + user_id_t break_id, + user_id_t break_loc_id) +{ + DynamicLoaderLinuxDYLD* dyld_instance; + + dyld_instance = static_cast<DynamicLoaderLinuxDYLD*>(baton); + dyld_instance->LoadAllCurrentModules(); + dyld_instance->SetRendezvousBreakpoint(); + return false; // Continue running. +} + +void +DynamicLoaderLinuxDYLD::SetRendezvousBreakpoint() +{ + Breakpoint *dyld_break; + addr_t break_addr; + + break_addr = m_rendezvous.GetBreakAddress(); + dyld_break = m_process->GetTarget().CreateBreakpoint(break_addr, true).get(); + dyld_break->SetCallback(RendezvousBreakpointHit, this, true); +} + +bool +DynamicLoaderLinuxDYLD::RendezvousBreakpointHit(void *baton, + StoppointCallbackContext *context, + user_id_t break_id, + user_id_t break_loc_id) +{ + DynamicLoaderLinuxDYLD* dyld_instance; + + dyld_instance = static_cast<DynamicLoaderLinuxDYLD*>(baton); + dyld_instance->RefreshModules(); + + // Return true to stop the target, false to just let the target run. + return dyld_instance->GetStopWhenImagesChange(); +} + +void +DynamicLoaderLinuxDYLD::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->base_addr); + if (!module_sp.empty()) + 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); + ModuleSP module_sp = loaded_modules.FindFirstModuleForFileSpec(file); + if (!module_sp.empty()) + old_modules.Append(module_sp); + } + m_process->GetTarget().ModulesDidUnload(old_modules); + } +} + +ThreadPlanSP +DynamicLoaderLinuxDYLD::GetStepThroughTrampolinePlan(Thread &thread, bool stop_others) +{ + LogSP log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); + ThreadPlanSP thread_plan_sp; + + if (log) + log->PutCString("DynamicLoaderLinuxDYLD: " + "GetStepThroughTrampolinePlan not implemented\n"); + + return thread_plan_sp; +} + +void +DynamicLoaderLinuxDYLD::LoadAllCurrentModules() +{ + DYLDRendezvous::iterator I; + DYLDRendezvous::iterator E; + ModuleList module_list; + + if (!m_rendezvous.Resolve()) + return; + + for (I = m_rendezvous.begin(), E = m_rendezvous.end(); I != E; ++I) + { + FileSpec file(I->path.c_str(), false); + ModuleSP module_sp = LoadModuleAtAddress(file, I->base_addr); + if (!module_sp.empty()) + module_list.Append(module_sp); + } + + m_process->GetTarget().ModulesDidLoad(module_list); +} + +ModuleSP +DynamicLoaderLinuxDYLD::LoadModuleAtAddress(const FileSpec &file, addr_t base_addr) +{ + Target &target = m_process->GetTarget(); + ModuleList &modules = target.GetImages(); + ModuleSP module_sp; + + if ((module_sp = modules.FindFirstModuleForFileSpec(file))) + { + UpdateLoadedSections(module_sp, base_addr); + } + else if ((module_sp = target.GetSharedModule(file, target.GetArchitecture()))) + { + UpdateLoadedSections(module_sp, base_addr); + modules.Append(module_sp); + } + + return module_sp; +} + +addr_t +DynamicLoaderLinuxDYLD::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(); + ObjectFile *exe = module->GetObjectFile(); + Address file_entry = exe->GetEntryPoint(); + + if (!file_entry.IsValid()) + return LLDB_INVALID_ADDRESS; + + m_load_offset = virt_entry - file_entry.GetFileAddress(); + return m_load_offset; +} + +addr_t +DynamicLoaderLinuxDYLD::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; +} |
