| //===-- DynamicLoaderMacOSXDYLD.cpp -----------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| |
| #include "llvm/Support/MachO.h" |
| |
| #include "lldb/Breakpoint/StoppointCallbackContext.h" |
| #include "lldb/Core/DataBuffer.h" |
| #include "lldb/Core/DataBufferHeap.h" |
| #include "lldb/Core/Log.h" |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/PluginManager.h" |
| #include "lldb/Core/State.h" |
| #include "lldb/Symbol/ObjectFile.h" |
| #include "lldb/Target/ObjCLanguageRuntime.h" |
| #include "lldb/Target/RegisterContext.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Target/ThreadPlanRunToAddress.h" |
| #include "lldb/Target/StackFrame.h" |
| |
| #include "DynamicLoaderMacOSXDYLD.h" |
| |
| //#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN |
| #ifdef ENABLE_DEBUG_PRINTF |
| #include <stdio.h> |
| #define DEBUG_PRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__) |
| #else |
| #define DEBUG_PRINTF(fmt, ...) |
| #endif |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| /// FIXME - The ObjC Runtime trampoline handler doesn't really belong here. |
| /// I am putting it here so I can invoke it in the Trampoline code here, but |
| /// it should be moved to the ObjC Runtime support when it is set up. |
| |
| |
| DynamicLoaderMacOSXDYLD::DYLDImageInfo * |
| DynamicLoaderMacOSXDYLD::GetImageInfo (Module *module) |
| { |
| const UUID &module_uuid = module->GetUUID(); |
| DYLDImageInfo::collection::iterator pos, end = m_dyld_image_infos.end(); |
| |
| // First try just by UUID as it is the safest. |
| if (module_uuid.IsValid()) |
| { |
| for (pos = m_dyld_image_infos.begin(); pos != end; ++pos) |
| { |
| if (pos->uuid == module_uuid) |
| return &(*pos); |
| } |
| |
| if (m_dyld.uuid == module_uuid) |
| return &m_dyld; |
| } |
| |
| // Next try by platform path only for things that don't have a valid UUID |
| // since if a file has a valid UUID in real life it should also in the |
| // dyld info. This is the next safest because the paths in the dyld info |
| // are platform paths, not local paths. For local debugging platform == local |
| // paths. |
| const FileSpec &platform_file_spec = module->GetPlatformFileSpec(); |
| for (pos = m_dyld_image_infos.begin(); pos != end; ++pos) |
| { |
| if (pos->file_spec == platform_file_spec && pos->uuid.IsValid() == false) |
| return &(*pos); |
| } |
| |
| if (m_dyld.file_spec == platform_file_spec && m_dyld.uuid.IsValid() == false) |
| return &m_dyld; |
| |
| return NULL; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Create an instance of this class. This function is filled into |
| // the plugin info class that gets handed out by the plugin factory and |
| // allows the lldb to instantiate an instance of this class. |
| //---------------------------------------------------------------------- |
| DynamicLoader * |
| DynamicLoaderMacOSXDYLD::CreateInstance (Process* process, bool force) |
| { |
| bool create = force; |
| if (!create) |
| { |
| create = true; |
| Module* exe_module = process->GetTarget().GetExecutableModulePointer(); |
| if (exe_module) |
| { |
| ObjectFile *object_file = exe_module->GetObjectFile(); |
| if (object_file) |
| { |
| create = (object_file->GetStrata() == ObjectFile::eStrataUser); |
| } |
| } |
| |
| if (create) |
| { |
| const llvm::Triple &triple_ref = process->GetTarget().GetArchitecture().GetTriple(); |
| create = triple_ref.getOS() == llvm::Triple::Darwin && triple_ref.getVendor() == llvm::Triple::Apple; |
| } |
| } |
| |
| if (create) |
| return new DynamicLoaderMacOSXDYLD (process); |
| return NULL; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Constructor |
| //---------------------------------------------------------------------- |
| DynamicLoaderMacOSXDYLD::DynamicLoaderMacOSXDYLD (Process* process) : |
| DynamicLoader(process), |
| m_dyld(), |
| m_dyld_all_image_infos_addr(LLDB_INVALID_ADDRESS), |
| m_dyld_all_image_infos(), |
| m_dyld_all_image_infos_stop_id (UINT32_MAX), |
| m_break_id(LLDB_INVALID_BREAK_ID), |
| m_dyld_image_infos(), |
| m_dyld_image_infos_stop_id (UINT32_MAX), |
| m_mutex(Mutex::eMutexTypeRecursive) |
| { |
| } |
| |
| //---------------------------------------------------------------------- |
| // Destructor |
| //---------------------------------------------------------------------- |
| DynamicLoaderMacOSXDYLD::~DynamicLoaderMacOSXDYLD() |
| { |
| Clear(true); |
| } |
| |
| //------------------------------------------------------------------ |
| /// Called after attaching a process. |
| /// |
| /// Allow DynamicLoader plug-ins to execute some code after |
| /// attaching to a process. |
| //------------------------------------------------------------------ |
| void |
| DynamicLoaderMacOSXDYLD::DidAttach () |
| { |
| PrivateInitialize(m_process); |
| LocateDYLD (); |
| SetNotificationBreakpoint (); |
| } |
| |
| //------------------------------------------------------------------ |
| /// Called after attaching a process. |
| /// |
| /// Allow DynamicLoader plug-ins to execute some code after |
| /// attaching to a process. |
| //------------------------------------------------------------------ |
| void |
| DynamicLoaderMacOSXDYLD::DidLaunch () |
| { |
| PrivateInitialize(m_process); |
| LocateDYLD (); |
| SetNotificationBreakpoint (); |
| } |
| |
| |
| //---------------------------------------------------------------------- |
| // Clear out the state of this class. |
| //---------------------------------------------------------------------- |
| void |
| DynamicLoaderMacOSXDYLD::Clear (bool clear_process) |
| { |
| Mutex::Locker locker(m_mutex); |
| |
| if (m_process->IsAlive() && LLDB_BREAK_ID_IS_VALID(m_break_id)) |
| m_process->ClearBreakpointSiteByID(m_break_id); |
| |
| if (clear_process) |
| m_process = NULL; |
| m_dyld.Clear(false); |
| m_dyld_all_image_infos_addr = LLDB_INVALID_ADDRESS; |
| m_dyld_all_image_infos.Clear(); |
| m_break_id = LLDB_INVALID_BREAK_ID; |
| m_dyld_image_infos.clear(); |
| } |
| |
| //---------------------------------------------------------------------- |
| // Check if we have found DYLD yet |
| //---------------------------------------------------------------------- |
| bool |
| DynamicLoaderMacOSXDYLD::DidSetNotificationBreakpoint() const |
| { |
| return LLDB_BREAK_ID_IS_VALID (m_break_id); |
| } |
| |
| //---------------------------------------------------------------------- |
| // Try and figure out where dyld is by first asking the Process |
| // if it knows (which currently calls down in the the lldb::Process |
| // to get the DYLD info (available on SnowLeopard only). If that fails, |
| // then check in the default addresses. |
| //---------------------------------------------------------------------- |
| bool |
| DynamicLoaderMacOSXDYLD::LocateDYLD() |
| { |
| if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS) |
| { |
| // Check the image info addr as it might point to the |
| // mach header for dyld, or it might point to the |
| // dyld_all_image_infos struct |
| const addr_t shlib_addr = m_process->GetImageInfoAddress (); |
| |
| ByteOrder byte_order = m_process->GetTarget().GetArchitecture().GetByteOrder(); |
| uint8_t buf[4]; |
| DataExtractor data (buf, sizeof(buf), byte_order, 4); |
| Error error; |
| if (m_process->ReadMemory (shlib_addr, buf, 4, error) == 4) |
| { |
| uint32_t offset = 0; |
| uint32_t magic = data.GetU32 (&offset); |
| switch (magic) |
| { |
| case llvm::MachO::HeaderMagic32: |
| case llvm::MachO::HeaderMagic64: |
| case llvm::MachO::HeaderMagic32Swapped: |
| case llvm::MachO::HeaderMagic64Swapped: |
| return ReadDYLDInfoFromMemoryAndSetNotificationCallback(shlib_addr); |
| |
| default: |
| break; |
| } |
| } |
| // Maybe it points to the all image infos? |
| m_dyld_all_image_infos_addr = shlib_addr; |
| } |
| |
| if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS) |
| { |
| if (ReadAllImageInfosStructure ()) |
| { |
| if (m_dyld_all_image_infos.dyldImageLoadAddress != LLDB_INVALID_ADDRESS) |
| return ReadDYLDInfoFromMemoryAndSetNotificationCallback (m_dyld_all_image_infos.dyldImageLoadAddress); |
| else |
| return ReadDYLDInfoFromMemoryAndSetNotificationCallback (m_dyld_all_image_infos_addr & 0xfffffffffff00000ull); |
| } |
| } |
| |
| // Check some default values |
| Module *executable = m_process->GetTarget().GetExecutableModulePointer(); |
| |
| if (executable) |
| { |
| const ArchSpec &exe_arch = executable->GetArchitecture(); |
| if (exe_arch.GetAddressByteSize() == 8) |
| { |
| return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x7fff5fc00000ull); |
| } |
| else if (exe_arch.GetMachine() == llvm::Triple::arm || exe_arch.GetMachine() == llvm::Triple::thumb) |
| { |
| return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x2fe00000); |
| } |
| else |
| { |
| return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x8fe00000); |
| } |
| } |
| return false; |
| } |
| |
| ModuleSP |
| DynamicLoaderMacOSXDYLD::FindTargetModuleForDYLDImageInfo (const DYLDImageInfo &image_info, bool can_create, bool *did_create_ptr) |
| { |
| if (did_create_ptr) |
| *did_create_ptr = false; |
| ModuleList &target_images = m_process->GetTarget().GetImages(); |
| ModuleSpec module_spec (image_info.file_spec, image_info.GetArchitecture ()); |
| module_spec.GetUUID() = image_info.uuid; |
| ModuleSP module_sp (target_images.FindFirstModule (module_spec)); |
| |
| if (module_sp) |
| { |
| // 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) |
| { |
| if (!module_sp) |
| { |
| module_sp = m_process->GetTarget().GetSharedModule (module_spec); |
| if (!module_sp || module_sp->GetObjectFile() == NULL) |
| { |
| const bool add_image_to_target = true; |
| const bool load_image_sections_in_target = false; |
| module_sp = m_process->ReadModuleFromMemory (image_info.file_spec, |
| image_info.address, |
| add_image_to_target, |
| load_image_sections_in_target); |
| } |
| |
| if (did_create_ptr) |
| *did_create_ptr = module_sp; |
| } |
| } |
| } |
| return module_sp; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Assume that dyld is in memory at ADDR and try to parse it's load |
| // commands |
| //---------------------------------------------------------------------- |
| bool |
| DynamicLoaderMacOSXDYLD::ReadDYLDInfoFromMemoryAndSetNotificationCallback(lldb::addr_t addr) |
| { |
| DataExtractor data; // Load command data |
| if (ReadMachHeader (addr, &m_dyld.header, &data)) |
| { |
| if (m_dyld.header.filetype == llvm::MachO::HeaderFileTypeDynamicLinkEditor) |
| { |
| m_dyld.address = addr; |
| ModuleSP dyld_module_sp; |
| if (ParseLoadCommands (data, m_dyld, &m_dyld.file_spec)) |
| { |
| if (m_dyld.file_spec) |
| { |
| dyld_module_sp = FindTargetModuleForDYLDImageInfo (m_dyld, true, NULL); |
| |
| if (dyld_module_sp) |
| UpdateImageLoadAddress (dyld_module_sp.get(), m_dyld); |
| } |
| } |
| |
| if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS && dyld_module_sp.get()) |
| { |
| static ConstString g_dyld_all_image_infos ("dyld_all_image_infos"); |
| const Symbol *symbol = dyld_module_sp->FindFirstSymbolWithNameAndType (g_dyld_all_image_infos, eSymbolTypeData); |
| if (symbol) |
| m_dyld_all_image_infos_addr = symbol->GetAddress().GetLoadAddress(&m_process->GetTarget()); |
| } |
| |
| // Update all image infos |
| InitializeFromAllImageInfos (); |
| |
| // If we didn't have an executable before, but now we do, then the |
| // dyld module shared pointer might be unique and we may need to add |
| // it again (since Target::SetExecutableModule() will clear the |
| // images). So append the dyld module back to the list if it is |
| /// unique! |
| if (dyld_module_sp && m_process->GetTarget().GetImages().AppendIfNeeded (dyld_module_sp)) |
| UpdateImageLoadAddress(dyld_module_sp.get(), m_dyld); |
| |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool |
| DynamicLoaderMacOSXDYLD::NeedToLocateDYLD () const |
| { |
| return m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS; |
| } |
| |
| bool |
| DynamicLoaderMacOSXDYLD::UpdateCommPageLoadAddress(Module *module) |
| { |
| 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) |
| { |
| uint32_t num_sections = section_list->GetSize(); |
| for (uint32_t i=0; i<num_sections; ++i) |
| { |
| Section* section = section_list->GetSectionAtIndex (i).get(); |
| if (section) |
| { |
| const addr_t new_section_load_addr = section->GetFileAddress (); |
| const addr_t old_section_load_addr = m_process->GetTarget().GetSectionLoadList().GetSectionLoadAddress (section); |
| if (old_section_load_addr == LLDB_INVALID_ADDRESS || |
| old_section_load_addr != new_section_load_addr) |
| { |
| if (m_process->GetTarget().GetSectionLoadList().SetSectionLoadAddress (section, section->GetFileAddress ())) |
| changed = true; |
| } |
| } |
| } |
| } |
| } |
| } |
| return changed; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Update the load addresses for all segments in MODULE using the |
| // updated INFO that is passed in. |
| //---------------------------------------------------------------------- |
| bool |
| DynamicLoaderMacOSXDYLD::UpdateImageLoadAddress (Module *module, DYLDImageInfo& 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<uint32_t> inaccessible_segment_indexes; |
| // We now know the slide amount, so go through all sections |
| // and update the load addresses with the correct values. |
| uint32_t num_segments = info.segments.size(); |
| for (uint32_t i=0; i<num_segments; ++i) |
| { |
| // Only load a segment if it has protections. Things like |
| // __PAGEZERO don't have any protections, and they shouldn't |
| // be slid |
| SectionSP section_sp(section_list->FindSectionByName(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; |
| |
| const addr_t old_section_load_addr = m_process->GetTarget().GetSectionLoadList().GetSectionLoadAddress (section_sp.get()); |
| if (old_section_load_addr == LLDB_INVALID_ADDRESS || |
| old_section_load_addr != new_section_load_addr) |
| { |
| if (m_process->GetTarget().GetSectionLoadList().SetSectionLoadAddress (section_sp.get(), new_section_load_addr, warn_multiple)) |
| changed = true; |
| } |
| } |
| else |
| { |
| Host::SystemLog (Host::eSystemLogWarning, |
| "warning: unable to find and load segment named '%s' at 0x%llx in '%s/%s' in macosx dynamic loader plug-in.\n", |
| info.segments[i].name.AsCString("<invalid>"), |
| (uint64_t)new_section_load_addr, |
| image_object_file->GetFileSpec().GetDirectory().AsCString(), |
| image_object_file->GetFileSpec().GetFilename().AsCString()); |
| } |
| } |
| } |
| |
| // 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; i<inaccessible_segment_indexes.size(); ++i) |
| { |
| const uint32_t seg_idx = inaccessible_segment_indexes[i]; |
| SectionSP section_sp(section_list->FindSectionByName(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); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| return changed; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Update the load addresses for all segments in MODULE using the |
| // updated INFO that is passed in. |
| //---------------------------------------------------------------------- |
| bool |
| DynamicLoaderMacOSXDYLD::UnloadImageLoadAddress (Module *module, DYLDImageInfo& 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) |
| { |
| uint32_t num_segments = info.segments.size(); |
| for (uint32_t i=0; i<num_segments; ++i) |
| { |
| SectionSP section_sp(section_list->FindSectionByName(info.segments[i].name)); |
| if (section_sp) |
| { |
| const addr_t old_section_load_addr = info.segments[i].vmaddr + info.slide; |
| if (m_process->GetTarget().GetSectionLoadList().SetSectionUnloaded (section_sp.get(), old_section_load_addr)) |
| changed = true; |
| } |
| else |
| { |
| Host::SystemLog (Host::eSystemLogWarning, |
| "warning: unable to find and unload segment named '%s' in '%s/%s' in macosx dynamic loader plug-in.\n", |
| info.segments[i].name.AsCString("<invalid>"), |
| image_object_file->GetFileSpec().GetDirectory().AsCString(), |
| image_object_file->GetFileSpec().GetFilename().AsCString()); |
| } |
| } |
| } |
| } |
| } |
| return changed; |
| } |
| |
| |
| //---------------------------------------------------------------------- |
| // Static callback function that gets called when our DYLD notification |
| // breakpoint gets hit. We update all of our image infos and then |
| // let our super class DynamicLoader class decide if we should stop |
| // or not (based on global preference). |
| //---------------------------------------------------------------------- |
| bool |
| DynamicLoaderMacOSXDYLD::NotifyBreakpointHit (void *baton, |
| StoppointCallbackContext *context, |
| lldb::user_id_t break_id, |
| lldb::user_id_t break_loc_id) |
| { |
| // Let the event know that the images have changed |
| // DYLD passes three arguments to the notification breakpoint. |
| // Arg1: enum dyld_image_mode mode - 0 = adding, 1 = removing |
| // Arg2: uint32_t infoCount - Number of shared libraries added |
| // Arg3: dyld_image_info info[] - Array of structs of the form: |
| // const struct mach_header *imageLoadAddress |
| // const char *imageFilePath |
| // uintptr_t imageFileModDate (a time_t) |
| |
| DynamicLoaderMacOSXDYLD* dyld_instance = (DynamicLoaderMacOSXDYLD*) baton; |
| |
| // First step is to see if we've already initialized the all image infos. If we haven't then this function |
| // will do so and return true. In the course of initializing the all_image_infos it will read the complete |
| // current state, so we don't need to figure out what has changed from the data passed in to us. |
| |
| if (dyld_instance->InitializeFromAllImageInfos()) |
| return dyld_instance->GetStopWhenImagesChange(); |
| |
| ExecutionContext exe_ctx (context->exe_ctx_ref); |
| Process *process = exe_ctx.GetProcessPtr(); |
| const lldb::ABISP &abi = process->GetABI(); |
| if (abi != NULL) |
| { |
| // Build up the value array to store the three arguments given above, then get the values from the ABI: |
| |
| ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext(); |
| ValueList argument_values; |
| Value input_value; |
| |
| void *clang_void_ptr_type = clang_ast_context->GetVoidPtrType(false); |
| void *clang_uint32_type = clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(lldb::eEncodingUint, 32); |
| input_value.SetValueType (Value::eValueTypeScalar); |
| input_value.SetContext (Value::eContextTypeClangType, clang_uint32_type); |
| argument_values.PushValue(input_value); |
| argument_values.PushValue(input_value); |
| input_value.SetContext (Value::eContextTypeClangType, clang_void_ptr_type); |
| argument_values.PushValue (input_value); |
| |
| if (abi->GetArgumentValues (exe_ctx.GetThreadRef(), argument_values)) |
| { |
| uint32_t dyld_mode = argument_values.GetValueAtIndex(0)->GetScalar().UInt (-1); |
| if (dyld_mode != -1) |
| { |
| // Okay the mode was right, now get the number of elements, and the array of new elements... |
| uint32_t image_infos_count = argument_values.GetValueAtIndex(1)->GetScalar().UInt (-1); |
| if (image_infos_count != -1) |
| { |
| // Got the number added, now go through the array of added elements, putting out the mach header |
| // address, and adding the image. |
| // Note, I'm not putting in logging here, since the AddModules & RemoveModules functions do |
| // all the logging internally. |
| |
| lldb::addr_t image_infos_addr = argument_values.GetValueAtIndex(2)->GetScalar().ULongLong(); |
| if (dyld_mode == 0) |
| { |
| // This is add: |
| dyld_instance->AddModulesUsingImageInfosAddress (image_infos_addr, image_infos_count); |
| } |
| else |
| { |
| // This is remove: |
| dyld_instance->RemoveModulesUsingImageInfosAddress (image_infos_addr, image_infos_count); |
| } |
| |
| } |
| } |
| } |
| } |
| |
| // Return true to stop the target, false to just let the target run |
| return dyld_instance->GetStopWhenImagesChange(); |
| } |
| |
| bool |
| DynamicLoaderMacOSXDYLD::ReadAllImageInfosStructure () |
| { |
| Mutex::Locker locker(m_mutex); |
| |
| // the all image infos is already valid for this process stop ID |
| if (m_process->GetStopID() == m_dyld_all_image_infos_stop_id) |
| return true; |
| |
| m_dyld_all_image_infos.Clear(); |
| if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS) |
| { |
| ByteOrder byte_order = m_process->GetTarget().GetArchitecture().GetByteOrder(); |
| uint32_t addr_size = 4; |
| if (m_dyld_all_image_infos_addr > UINT32_MAX) |
| addr_size = 8; |
| |
| uint8_t buf[256]; |
| DataExtractor data (buf, sizeof(buf), byte_order, addr_size); |
| uint32_t offset = 0; |
| |
| const size_t count_v2 = sizeof (uint32_t) + // version |
| sizeof (uint32_t) + // infoArrayCount |
| addr_size + // infoArray |
| addr_size + // notification |
| addr_size + // processDetachedFromSharedRegion + libSystemInitialized + pad |
| addr_size; // dyldImageLoadAddress |
| const size_t count_v11 = count_v2 + |
| addr_size + // jitInfo |
| addr_size + // dyldVersion |
| addr_size + // errorMessage |
| addr_size + // terminationFlags |
| addr_size + // coreSymbolicationShmPage |
| addr_size + // systemOrderFlag |
| addr_size + // uuidArrayCount |
| addr_size + // uuidArray |
| addr_size + // dyldAllImageInfosAddress |
| addr_size + // initialImageCount |
| addr_size + // errorKind |
| addr_size + // errorClientOfDylibPath |
| addr_size + // errorTargetDylibPath |
| addr_size; // errorSymbol |
| assert (sizeof (buf) >= count_v11); |
| |
| int count; |
| Error error; |
| if (m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, 4, error) == 4) |
| { |
| m_dyld_all_image_infos.version = data.GetU32(&offset); |
| // If anything in the high byte is set, we probably got the byte |
| // order incorrect (the process might not have it set correctly |
| // yet due to attaching to a program without a specified file). |
| if (m_dyld_all_image_infos.version & 0xff000000) |
| { |
| // We have guessed the wrong byte order. Swap it and try |
| // reading the version again. |
| if (byte_order == eByteOrderLittle) |
| byte_order = eByteOrderBig; |
| else |
| byte_order = eByteOrderLittle; |
| |
| data.SetByteOrder (byte_order); |
| offset = 0; |
| m_dyld_all_image_infos.version = data.GetU32(&offset); |
| } |
| } |
| else |
| { |
| return false; |
| } |
| |
| if (m_dyld_all_image_infos.version >= 11) |
| count = count_v11; |
| else |
| count = count_v2; |
| |
| const size_t bytes_read = m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, count, error); |
| if (bytes_read == count) |
| { |
| offset = 0; |
| m_dyld_all_image_infos.version = data.GetU32(&offset); |
| m_dyld_all_image_infos.dylib_info_count = data.GetU32(&offset); |
| m_dyld_all_image_infos.dylib_info_addr = data.GetPointer(&offset); |
| m_dyld_all_image_infos.notification = data.GetPointer(&offset); |
| m_dyld_all_image_infos.processDetachedFromSharedRegion = data.GetU8(&offset); |
| m_dyld_all_image_infos.libSystemInitialized = data.GetU8(&offset); |
| // Adjust for padding. |
| offset += addr_size - 2; |
| m_dyld_all_image_infos.dyldImageLoadAddress = data.GetPointer(&offset); |
| if (m_dyld_all_image_infos.version >= 11) |
| { |
| offset += addr_size * 8; |
| uint64_t dyld_all_image_infos_addr = data.GetPointer(&offset); |
| |
| // When we started, we were given the actual address of the all_image_infos |
| // struct (probably via TASK_DYLD_INFO) in memory - this address is stored in |
| // m_dyld_all_image_infos_addr and is the most accurate address we have. |
| |
| // We read the dyld_all_image_infos struct from memory; it contains its own address. |
| // If the address in the struct does not match the actual address, |
| // the dyld we're looking at has been loaded at a different location (slid) from |
| // where it intended to load. The addresses in the dyld_all_image_infos struct |
| // are the original, non-slid addresses, and need to be adjusted. Most importantly |
| // the address of dyld and the notification address need to be adjusted. |
| |
| if (dyld_all_image_infos_addr != m_dyld_all_image_infos_addr) |
| { |
| uint64_t image_infos_offset = dyld_all_image_infos_addr - m_dyld_all_image_infos.dyldImageLoadAddress; |
| uint64_t notification_offset = m_dyld_all_image_infos.notification - m_dyld_all_image_infos.dyldImageLoadAddress; |
| m_dyld_all_image_infos.dyldImageLoadAddress = m_dyld_all_image_infos_addr - image_infos_offset; |
| m_dyld_all_image_infos.notification = m_dyld_all_image_infos.dyldImageLoadAddress + notification_offset; |
| } |
| } |
| m_dyld_all_image_infos_stop_id = m_process->GetStopID(); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| |
| bool |
| DynamicLoaderMacOSXDYLD::AddModulesUsingImageInfosAddress (lldb::addr_t image_infos_addr, uint32_t image_infos_count) |
| { |
| DYLDImageInfo::collection image_infos; |
| LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); |
| if (log) |
| log->Printf ("Adding %d modules.\n", image_infos_count); |
| |
| Mutex::Locker locker(m_mutex); |
| if (m_process->GetStopID() == m_dyld_image_infos_stop_id) |
| return true; |
| |
| if (!ReadImageInfos (image_infos_addr, image_infos_count, image_infos)) |
| return false; |
| |
| UpdateImageInfosHeaderAndLoadCommands (image_infos, image_infos_count, false); |
| bool return_value = AddModulesUsingImageInfos (image_infos); |
| m_dyld_image_infos_stop_id = m_process->GetStopID(); |
| return return_value; |
| } |
| |
| // Adds the modules in image_infos to m_dyld_image_infos. |
| // NB don't call this passing in m_dyld_image_infos. |
| |
| bool |
| DynamicLoaderMacOSXDYLD::AddModulesUsingImageInfos (DYLDImageInfo::collection &image_infos) |
| { |
| // Now add these images to the main list. |
| ModuleList loaded_module_list; |
| LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); |
| |
| for (uint32_t idx = 0; idx < image_infos.size(); ++idx) |
| { |
| if (log) |
| { |
| log->Printf ("Adding new image at address=0x%16.16llx.", image_infos[idx].address); |
| image_infos[idx].PutToLog (log.get()); |
| } |
| |
| m_dyld_image_infos.push_back(image_infos[idx]); |
| |
| ModuleSP image_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[idx], true, NULL)); |
| |
| if (image_module_sp) |
| { |
| if (image_infos[idx].header.filetype == llvm::MachO::HeaderFileTypeDynamicLinkEditor) |
| image_module_sp->SetIsDynamicLinkEditor (true); |
| |
| 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) |
| { |
| ModuleList& target_images = m_process->GetTarget().GetImages(); |
| 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->GetOffset() + commpage_section->GetFileOffset()); |
| commpage_image_module_sp = m_process->GetTarget().GetSharedModule (module_spec); |
| if (!commpage_image_module_sp || commpage_image_module_sp->GetObjectFile() == NULL) |
| { |
| const bool add_image_to_target = true; |
| const bool load_image_sections_in_target = false; |
| commpage_image_module_sp = m_process->ReadModuleFromMemory (image_infos[idx].file_spec, |
| image_infos[idx].address, |
| add_image_to_target, |
| load_image_sections_in_target); |
| } |
| } |
| if (commpage_image_module_sp) |
| UpdateCommPageLoadAddress (commpage_image_module_sp.get()); |
| } |
| } |
| } |
| |
| // 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])) |
| { |
| loaded_module_list.AppendIfNeeded (image_module_sp); |
| } |
| } |
| } |
| |
| if (loaded_module_list.GetSize() > 0) |
| { |
| // FIXME: This should really be in the Runtime handlers class, which should get |
| // called by the target's ModulesDidLoad, but we're doing it all locally for now |
| // to save time. |
| // Also, I'm assuming there can be only one libobjc dylib loaded... |
| |
| ObjCLanguageRuntime *objc_runtime = m_process->GetObjCLanguageRuntime(true); |
| if (objc_runtime != NULL && !objc_runtime->HasReadObjCLibrary()) |
| { |
| size_t num_modules = loaded_module_list.GetSize(); |
| for (int i = 0; i < num_modules; i++) |
| { |
| if (objc_runtime->IsModuleObjCLibrary (loaded_module_list.GetModuleAtIndex (i))) |
| { |
| objc_runtime->ReadObjCLibrary (loaded_module_list.GetModuleAtIndex (i)); |
| break; |
| } |
| } |
| } |
| if (log) |
| loaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderMacOSXDYLD::ModulesDidLoad"); |
| m_process->GetTarget().ModulesDidLoad (loaded_module_list); |
| } |
| return true; |
| } |
| |
| bool |
| DynamicLoaderMacOSXDYLD::RemoveModulesUsingImageInfosAddress (lldb::addr_t image_infos_addr, uint32_t image_infos_count) |
| { |
| DYLDImageInfo::collection image_infos; |
| LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); |
| |
| Mutex::Locker locker(m_mutex); |
| if (m_process->GetStopID() == m_dyld_image_infos_stop_id) |
| return true; |
| |
| // First read in the image_infos for the removed modules, and their headers & load commands. |
| if (!ReadImageInfos (image_infos_addr, image_infos_count, image_infos)) |
| { |
| if (log) |
| log->PutCString ("Failed reading image infos array."); |
| return false; |
| } |
| |
| if (log) |
| log->Printf ("Removing %d modules.", image_infos_count); |
| |
| ModuleList unloaded_module_list; |
| for (uint32_t idx = 0; idx < image_infos.size(); ++idx) |
| { |
| if (log) |
| { |
| log->Printf ("Removing module at address=0x%16.16llx.", image_infos[idx].address); |
| image_infos[idx].PutToLog (log.get()); |
| } |
| |
| // Remove this image_infos from the m_all_image_infos. We do the comparision by address |
| // rather than by file spec because we can have many modules with the same "file spec" in the |
| // case that they are modules loaded from memory. |
| // |
| // Also copy over the uuid from the old entry to the removed entry so we can |
| // use it to lookup the module in the module list. |
| |
| DYLDImageInfo::collection::iterator pos, end = m_dyld_image_infos.end(); |
| for (pos = m_dyld_image_infos.begin(); pos != end; pos++) |
| { |
| if (image_infos[idx].address == (*pos).address) |
| { |
| image_infos[idx].uuid = (*pos).uuid; |
| |
| // Add the module from this image_info to the "unloaded_module_list". We'll remove them all at |
| // one go later on. |
| |
| ModuleSP unload_image_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[idx], false, NULL)); |
| if (unload_image_module_sp.get()) |
| { |
| // When we unload, be sure to use the image info from the old list, |
| // since that has sections correctly filled in. |
| UnloadImageLoadAddress (unload_image_module_sp.get(), *pos); |
| unloaded_module_list.AppendIfNeeded (unload_image_module_sp); |
| } |
| else |
| { |
| if (log) |
| { |
| log->Printf ("Could not find module for unloading info entry:"); |
| image_infos[idx].PutToLog(log.get()); |
| } |
| } |
| |
| // Then remove it from the m_dyld_image_infos: |
| |
| m_dyld_image_infos.erase(pos); |
| break; |
| } |
| } |
| |
| if (pos == end) |
| { |
| if (log) |
| { |
| log->Printf ("Could not find image_info entry for unloading image:"); |
| image_infos[idx].PutToLog(log.get()); |
| } |
| } |
| } |
| if (unloaded_module_list.GetSize() > 0) |
| { |
| if (log) |
| { |
| log->PutCString("Unloaded:"); |
| unloaded_module_list.LogUUIDAndPaths (log, "DynamicLoaderMacOSXDYLD::ModulesDidUnload"); |
| } |
| m_process->GetTarget().ModulesDidUnload (unloaded_module_list); |
| } |
| m_dyld_image_infos_stop_id = m_process->GetStopID(); |
| return true; |
| } |
| |
| bool |
| DynamicLoaderMacOSXDYLD::ReadImageInfos (lldb::addr_t image_infos_addr, |
| uint32_t image_infos_count, |
| DYLDImageInfo::collection &image_infos) |
| { |
| const ByteOrder endian = m_dyld.GetByteOrder(); |
| const uint32_t addr_size = m_dyld.GetAddressByteSize(); |
| |
| image_infos.resize(image_infos_count); |
| const size_t count = image_infos.size() * 3 * addr_size; |
| DataBufferHeap info_data(count, 0); |
| Error error; |
| const size_t bytes_read = m_process->ReadMemory (image_infos_addr, |
| info_data.GetBytes(), |
| info_data.GetByteSize(), |
| error); |
| if (bytes_read == count) |
| { |
| uint32_t info_data_offset = 0; |
| DataExtractor info_data_ref(info_data.GetBytes(), info_data.GetByteSize(), endian, addr_size); |
| for (int i = 0; i < image_infos.size() && info_data_ref.ValidOffset(info_data_offset); i++) |
| { |
| image_infos[i].address = info_data_ref.GetPointer(&info_data_offset); |
| lldb::addr_t path_addr = info_data_ref.GetPointer(&info_data_offset); |
| image_infos[i].mod_date = info_data_ref.GetPointer(&info_data_offset); |
| |
| char raw_path[PATH_MAX]; |
| m_process->ReadCStringFromMemory (path_addr, raw_path, sizeof(raw_path), error); |
| // don't resolve the path |
| if (error.Success()) |
| { |
| const bool resolve_path = false; |
| image_infos[i].file_spec.SetFile(raw_path, resolve_path); |
| } |
| } |
| return true; |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // If we have found where the "_dyld_all_image_infos" lives in memory, |
| // read the current info from it, and then update all image load |
| // addresses (or lack thereof). Only do this if this is the first time |
| // we're reading the dyld infos. Return true if we actually read anything, |
| // and false otherwise. |
| //---------------------------------------------------------------------- |
| bool |
| DynamicLoaderMacOSXDYLD::InitializeFromAllImageInfos () |
| { |
| LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); |
| |
| Mutex::Locker locker(m_mutex); |
| if (m_process->GetStopID() == m_dyld_image_infos_stop_id |
| || m_dyld_image_infos.size() != 0) |
| return false; |
| |
| if (ReadAllImageInfosStructure ()) |
| { |
| // Nothing to load or unload? |
| if (m_dyld_all_image_infos.dylib_info_count == 0) |
| return true; |
| |
| if (m_dyld_all_image_infos.dylib_info_addr == 0) |
| { |
| // DYLD is updating the images now. So we should say we have no images, and then we'll |
| // figure it out when we hit the added breakpoint. |
| return false; |
| } |
| else |
| { |
| if (!AddModulesUsingImageInfosAddress (m_dyld_all_image_infos.dylib_info_addr, |
| m_dyld_all_image_infos.dylib_info_count)) |
| { |
| DEBUG_PRINTF( "unable to read all data for all_dylib_infos."); |
| m_dyld_image_infos.clear(); |
| } |
| } |
| |
| // Now we have one more bit of business. If there is a library left in the images for our target that |
| // doesn't have a load address, then it must be something that we were expecting to load (for instance we |
| // read a load command for it) but it didn't in fact load - probably because DYLD_*_PATH pointed |
| // to an equivalent version. We don't want it to stay in the target's module list or it will confuse |
| // us, so unload it here. |
| Target &target = m_process->GetTarget(); |
| ModuleList &modules = target.GetImages(); |
| ModuleList not_loaded_modules; |
| size_t num_modules = modules.GetSize(); |
| for (size_t i = 0; i < num_modules; i++) |
| { |
| ModuleSP module_sp = modules.GetModuleAtIndex(i); |
| if (!module_sp->IsLoadedInTarget (&target)) |
| { |
| if (log) |
| { |
| StreamString s; |
| module_sp->GetDescription (&s); |
| log->Printf ("Unloading pre-run module: %s.", s.GetData ()); |
| } |
| not_loaded_modules.Append (module_sp); |
| } |
| } |
| |
| if (not_loaded_modules.GetSize() != 0) |
| { |
| target.ModulesDidUnload(not_loaded_modules); |
| } |
| |
| return true; |
| } |
| else |
| return false; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Read a mach_header at ADDR into HEADER, and also fill in the load |
| // command data into LOAD_COMMAND_DATA if it is non-NULL. |
| // |
| // Returns true if we succeed, false if we fail for any reason. |
| //---------------------------------------------------------------------- |
| bool |
| DynamicLoaderMacOSXDYLD::ReadMachHeader (lldb::addr_t addr, llvm::MachO::mach_header *header, DataExtractor *load_command_data) |
| { |
| DataBufferHeap header_bytes(sizeof(llvm::MachO::mach_header), 0); |
| Error error; |
| size_t bytes_read = m_process->ReadMemory (addr, |
| header_bytes.GetBytes(), |
| header_bytes.GetByteSize(), |
| error); |
| if (bytes_read == sizeof(llvm::MachO::mach_header)) |
| { |
| uint32_t offset = 0; |
| ::memset (header, 0, sizeof(llvm::MachO::mach_header)); |
| |
| // Get the magic byte unswapped so we can figure out what we are dealing with |
| DataExtractor data(header_bytes.GetBytes(), header_bytes.GetByteSize(), lldb::endian::InlHostByteOrder(), 4); |
| header->magic = data.GetU32(&offset); |
| lldb::addr_t load_cmd_addr = addr; |
| data.SetByteOrder(DynamicLoaderMacOSXDYLD::GetByteOrderFromMagic(header->magic)); |
| switch (header->magic) |
| { |
| case llvm::MachO::HeaderMagic32: |
| case llvm::MachO::HeaderMagic32Swapped: |
| data.SetAddressByteSize(4); |
| load_cmd_addr += sizeof(llvm::MachO::mach_header); |
| break; |
| |
| case llvm::MachO::HeaderMagic64: |
| case llvm::MachO::HeaderMagic64Swapped: |
| data.SetAddressByteSize(8); |
| load_cmd_addr += sizeof(llvm::MachO::mach_header_64); |
| break; |
| |
| default: |
| return false; |
| } |
| |
| // Read the rest of dyld's mach header |
| if (data.GetU32(&offset, &header->cputype, (sizeof(llvm::MachO::mach_header)/sizeof(uint32_t)) - 1)) |
| { |
| if (load_command_data == NULL) |
| return true; // We were able to read the mach_header and weren't asked to read the load command bytes |
| |
| DataBufferSP load_cmd_data_sp(new DataBufferHeap(header->sizeofcmds, 0)); |
| |
| size_t load_cmd_bytes_read = m_process->ReadMemory (load_cmd_addr, |
| load_cmd_data_sp->GetBytes(), |
| load_cmd_data_sp->GetByteSize(), |
| error); |
| |
| if (load_cmd_bytes_read == header->sizeofcmds) |
| { |
| // Set the load command data and also set the correct endian |
| // swap settings and the correct address size |
| load_command_data->SetData(load_cmd_data_sp, 0, header->sizeofcmds); |
| load_command_data->SetByteOrder(data.GetByteOrder()); |
| load_command_data->SetAddressByteSize(data.GetAddressByteSize()); |
| return true; // We successfully read the mach_header and the load command data |
| } |
| |
| return false; // We weren't able to read the load command data |
| } |
| } |
| return false; // We failed the read the mach_header |
| } |
| |
| |
| //---------------------------------------------------------------------- |
| // Parse the load commands for an image |
| //---------------------------------------------------------------------- |
| uint32_t |
| DynamicLoaderMacOSXDYLD::ParseLoadCommands (const DataExtractor& data, DYLDImageInfo& dylib_info, FileSpec *lc_id_dylinker) |
| { |
| uint32_t offset = 0; |
| uint32_t cmd_idx; |
| Segment segment; |
| dylib_info.Clear (true); |
| |
| for (cmd_idx = 0; cmd_idx < dylib_info.header.ncmds; cmd_idx++) |
| { |
| // Clear out any load command specific data from DYLIB_INFO since |
| // we are about to read it. |
| |
| if (data.ValidOffsetForDataOfSize (offset, sizeof(llvm::MachO::load_command))) |
| { |
| llvm::MachO::load_command load_cmd; |
| uint32_t load_cmd_offset = offset; |
| load_cmd.cmd = data.GetU32 (&offset); |
| load_cmd.cmdsize = data.GetU32 (&offset); |
| switch (load_cmd.cmd) |
| { |
| case llvm::MachO::LoadCommandSegment32: |
| { |
| segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16); |
| // We are putting 4 uint32_t values 4 uint64_t values so |
| // we have to use multiple 32 bit gets below. |
| segment.vmaddr = data.GetU32 (&offset); |
| segment.vmsize = data.GetU32 (&offset); |
| segment.fileoff = data.GetU32 (&offset); |
| segment.filesize = data.GetU32 (&offset); |
| // Extract maxprot, initprot, nsects and flags all at once |
| data.GetU32(&offset, &segment.maxprot, 4); |
| dylib_info.segments.push_back (segment); |
| } |
| break; |
| |
| case llvm::MachO::LoadCommandSegment64: |
| { |
| segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16); |
| // Extract vmaddr, vmsize, fileoff, and filesize all at once |
| data.GetU64(&offset, &segment.vmaddr, 4); |
| // Extract maxprot, initprot, nsects and flags all at once |
| data.GetU32(&offset, &segment.maxprot, 4); |
| dylib_info.segments.push_back (segment); |
| } |
| break; |
| |
| case llvm::MachO::LoadCommandDynamicLinkerIdent: |
| if (lc_id_dylinker) |
| { |
| uint32_t name_offset = load_cmd_offset + data.GetU32 (&offset); |
| const char *path = data.PeekCStr (name_offset); |
| lc_id_dylinker->SetFile (path, true); |
| } |
| break; |
| |
| case llvm::MachO::LoadCommandUUID: |
| dylib_info.uuid.SetBytes(data.GetData (&offset, 16)); |
| break; |
| |
| default: |
| break; |
| } |
| // Set offset to be the beginning of the next load command. |
| offset = load_cmd_offset + load_cmd.cmdsize; |
| } |
| } |
| |
| // 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 = dylib_info.segments.size(); |
| for (size_t i = 0; i < num_sections; ++i) |
| { |
| // 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 (dylib_info.segments[i].fileoff == 0 && dylib_info.segments[i].filesize > 0) |
| { |
| dylib_info.slide = dylib_info.address - dylib_info.segments[i].vmaddr; |
| // We have found the slide amount, so we can exit |
| // this for loop. |
| break; |
| } |
| } |
| return cmd_idx; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Read the mach_header and load commands for each image that the |
| // _dyld_all_image_infos structure points to and cache the results. |
| //---------------------------------------------------------------------- |
| |
| void |
| DynamicLoaderMacOSXDYLD::UpdateImageInfosHeaderAndLoadCommands(DYLDImageInfo::collection &image_infos, |
| uint32_t infos_count, |
| bool update_executable) |
| { |
| uint32_t exe_idx = UINT32_MAX; |
| LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER)); |
| // Read any UUID values that we can get |
| for (uint32_t i = 0; i < infos_count; i++) |
| { |
| if (!image_infos[i].UUIDValid()) |
| { |
| DataExtractor data; // Load command data |
| if (!ReadMachHeader (image_infos[i].address, &image_infos[i].header, &data)) |
| continue; |
| |
| ParseLoadCommands (data, image_infos[i], NULL); |
| |
| if (image_infos[i].header.filetype == llvm::MachO::HeaderFileTypeExecutable) |
| exe_idx = i; |
| |
| } |
| } |
| |
| if (exe_idx < image_infos.size()) |
| { |
| const bool can_create = true; |
| ModuleSP exe_module_sp (FindTargetModuleForDYLDImageInfo (image_infos[exe_idx], can_create, NULL)); |
| |
| if (!exe_module_sp) |
| { |
| ArchSpec exe_arch_spec (image_infos[exe_idx].GetArchitecture ()); |
| ModuleSpec module_spec (image_infos[exe_idx].file_spec, |
| image_infos[exe_idx].GetArchitecture ()); |
| module_spec.GetUUID() = image_infos[exe_idx].uuid; |
| exe_module_sp = m_process->GetTarget().GetSharedModule (module_spec); |
| if (!exe_module_sp || exe_module_sp->GetObjectFile() == NULL) |
| { |
| const bool add_image_to_target = true; |
| const bool load_image_sections_in_target = false; |
| exe_module_sp = m_process->ReadModuleFromMemory (image_infos[exe_idx].file_spec, |
| image_infos[exe_idx].address, |
| add_image_to_target, |
| load_image_sections_in_target); |
| } |
| } |
| |
| if (exe_module_sp) |
| { |
| if (exe_module_sp.get() != m_process->GetTarget().GetExecutableModulePointer()) |
| { |
| // Don't load dependent images since we are in dyld where we will know |
| // and find out about all images that are loaded |
| const bool get_dependent_images = false; |
| m_process->GetTarget().SetExecutableModule (exe_module_sp, |
| get_dependent_images); |
| } |
| } |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // 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 curently 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 |
| DynamicLoaderMacOSXDYLD::AlwaysRelyOnEHUnwindInfo (SymbolContext &sym_ctx) |
| { |
| ModuleSP module_sp; |
| if (sym_ctx.symbol) |
| { |
| module_sp = sym_ctx.symbol->GetAddress().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 |
| DynamicLoaderMacOSXDYLD::Segment::PutToLog (Log *log, lldb::addr_t slide) const |
| { |
| if (log) |
| { |
| if (slide == 0) |
| log->Printf ("\t\t%16s [0x%16.16llx - 0x%16.16llx)", |
| name.AsCString(""), |
| vmaddr + slide, |
| vmaddr + slide + vmsize); |
| else |
| log->Printf ("\t\t%16s [0x%16.16llx - 0x%16.16llx) slide = 0x%llx", |
| name.AsCString(""), |
| vmaddr + slide, |
| vmaddr + slide + vmsize, |
| slide); |
| } |
| } |
| |
| const DynamicLoaderMacOSXDYLD::Segment * |
| DynamicLoaderMacOSXDYLD::DYLDImageInfo::FindSegment (const ConstString &name) const |
| { |
| const size_t num_segments = segments.size(); |
| for (size_t i=0; i<num_segments; ++i) |
| { |
| if (segments[i].name == name) |
| return &segments[i]; |
| } |
| return NULL; |
| } |
| |
| |
| //---------------------------------------------------------------------- |
| // Dump an image info structure to the file handle provided. |
| //---------------------------------------------------------------------- |
| void |
| DynamicLoaderMacOSXDYLD::DYLDImageInfo::PutToLog (Log *log) const |
| { |
| if (log == NULL) |
| return; |
| uint8_t *u = (uint8_t *)uuid.GetBytes(); |
| |
| if (address == LLDB_INVALID_ADDRESS) |
| { |
| if (u) |
| { |
| 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)", |
| 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.GetDirectory().AsCString(), |
| file_spec.GetFilename().AsCString()); |
| } |
| else |
| log->Printf("\t modtime=0x%8.8llx path='%s/%s' (UNLOADED)", |
| mod_date, |
| file_spec.GetDirectory().AsCString(), |
| file_spec.GetFilename().AsCString()); |
| } |
| else |
| { |
| if (u) |
| { |
| 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'", |
| 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.GetDirectory().AsCString(), |
| file_spec.GetFilename().AsCString()); |
| } |
| else |
| { |
| log->Printf("\taddress=0x%16.16llx modtime=0x%8.8llx path='%s/%s'", |
| address, |
| mod_date, |
| file_spec.GetDirectory().AsCString(), |
| file_spec.GetFilename().AsCString()); |
| |
| } |
| for (uint32_t i=0; i<segments.size(); ++i) |
| segments[i].PutToLog(log, slide); |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // Dump the _dyld_all_image_infos members and all current image infos |
| // that we have parsed to the file handle provided. |
| //---------------------------------------------------------------------- |
| void |
| DynamicLoaderMacOSXDYLD::PutToLog(Log *log) const |
| { |
| if (log == NULL) |
| return; |
| |
| Mutex::Locker locker(m_mutex); |
| log->Printf("dyld_all_image_infos = { version=%d, count=%d, addr=0x%8.8llx, notify=0x%8.8llx }", |
| m_dyld_all_image_infos.version, |
| m_dyld_all_image_infos.dylib_info_count, |
| (uint64_t)m_dyld_all_image_infos.dylib_info_addr, |
| (uint64_t)m_dyld_all_image_infos.notification); |
| size_t i; |
| const size_t count = m_dyld_image_infos.size(); |
| if (count > 0) |
| { |
| log->PutCString("Loaded:"); |
| for (i = 0; i<count; i++) |
| m_dyld_image_infos[i].PutToLog(log); |
| } |
| } |
| |
| void |
| DynamicLoaderMacOSXDYLD::PrivateInitialize(Process *process) |
| { |
| DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState())); |
| Clear(true); |
| m_process = process; |
| m_process->GetTarget().GetSectionLoadList().Clear(); |
| } |
| |
| bool |
| DynamicLoaderMacOSXDYLD::SetNotificationBreakpoint () |
| { |
| DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState())); |
| if (m_break_id == LLDB_INVALID_BREAK_ID) |
| { |
| if (m_dyld_all_image_infos.notification != LLDB_INVALID_ADDRESS) |
| { |
| Address so_addr; |
| // Set the notification breakpoint and install a breakpoint |
| // callback function that will get called each time the |
| // breakpoint gets hit. We will use this to track when shared |
| // libraries get loaded/unloaded. |
| |
| if (m_process->GetTarget().GetSectionLoadList().ResolveLoadAddress(m_dyld_all_image_infos.notification, so_addr)) |
| { |
| Breakpoint *dyld_break = m_process->GetTarget().CreateBreakpoint (so_addr, true).get(); |
| dyld_break->SetCallback (DynamicLoaderMacOSXDYLD::NotifyBreakpointHit, this, true); |
| m_break_id = dyld_break->GetID(); |
| } |
| } |
| } |
| return m_break_id != LLDB_INVALID_BREAK_ID; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Member function that gets called when the process state changes. |
| //---------------------------------------------------------------------- |
| void |
| DynamicLoaderMacOSXDYLD::PrivateProcessStateChanged (Process *process, StateType state) |
| { |
| DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%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 (NeedToLocateDYLD ()) |
| LocateDYLD (); |
| |
| SetNotificationBreakpoint (); |
| } |
| break; |
| |
| case eStateRunning: |
| case eStateStepping: |
| case eStateCrashed: |
| case eStateSuspended: |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| // This bit in the n_desc field of the mach file means that this is a |
| // stub that runs arbitrary code to determine the trampoline target. |
| // We've established a naming convention with the CoreOS folks for the |
| // equivalent symbols they will use for this (which the objc guys didn't follow...) |
| // For now we'll just look for all symbols matching that naming convention... |
| |
| #define MACH_O_N_SYMBOL_RESOLVER 0x100 |
| |
| ThreadPlanSP |
| DynamicLoaderMacOSXDYLD::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; |
| LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP)); |
| |
| if (current_symbol != NULL) |
| { |
| if (current_symbol->IsTrampoline()) |
| { |
| const ConstString &trampoline_name = current_symbol->GetMangled().GetName(Mangled::ePreferMangled); |
| |
| if (trampoline_name) |
| { |
| SymbolContextList target_symbols; |
| TargetSP target_sp (thread.CalculateTarget()); |
| ModuleList &images = target_sp->GetImages(); |
| |
| images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeCode, target_symbols); |
| |
| size_t num_original_symbols = target_symbols.GetSize(); |
| // FIXME: The resolver symbol is only valid in object files. In binaries it is reused for the |
| // shared library slot number. So we'll have to look this up in the dyld info. |
| // For now, just turn this off. |
| |
| // bool orig_is_resolver = (current_symbol->GetFlags() & MACH_O_N_SYMBOL_RESOLVER) == MACH_O_N_SYMBOL_RESOLVER; |
| bool orig_is_resolver = false; |
| |
| if (num_original_symbols > 0) |
| { |
| // We found symbols that look like they are the targets to our symbol. Now look through the |
| // modules containing our symbols to see if there are any for our symbol. |
| |
| ModuleList modules_to_search; |
| |
| for (size_t i = 0; i < num_original_symbols; i++) |
| { |
| SymbolContext sc; |
| target_symbols.GetContextAtIndex(i, sc); |
| |
| ModuleSP module_sp (sc.symbol->CalculateSymbolContextModule()); |
| if (module_sp) |
| modules_to_search.AppendIfNeeded(module_sp); |
| } |
| |
| // If the original stub symbol is a resolver, then we don't want to break on the symbol with the |
| // original name, but instead on all the symbols it could resolve to since otherwise we would stop |
| // in the middle of the resolution... |
| // Note that the stub is not of the resolver type it will point to the equivalent symbol, |
| // not the original name, so in that case we don't need to do anything. |
| |
| if (orig_is_resolver) |
| { |
| target_symbols.Clear(); |
| |
| FindEquivalentSymbols (current_symbol, modules_to_search, target_symbols); |
| } |
| |
| // FIXME - Make the Run to Address take multiple addresses, and |
| // run to any of them. |
| uint32_t num_symbols = target_symbols.GetSize(); |
| if (num_symbols > 0) |
| { |
| std::vector<lldb::addr_t> addresses; |
| addresses.resize (num_symbols); |
| for (uint32_t i = 0; i < num_symbols; i++) |
| { |
| SymbolContext context; |
| AddressRange addr_range; |
| if (target_symbols.GetContextAtIndex(i, context)) |
| { |
| context.GetAddressRange (eSymbolContextEverything, 0, false, addr_range); |
| lldb::addr_t load_addr = addr_range.GetBaseAddress().GetLoadAddress(target_sp.get()); |
| addresses[i] = load_addr; |
| } |
| } |
| if (addresses.size() > 0) |
| thread_plan_sp.reset (new ThreadPlanRunToAddress (thread, addresses, stop_others)); |
| else |
| { |
| if (log) |
| log->Printf ("Couldn't resolve the symbol contexts."); |
| } |
| } |
| else |
| { |
| if (log) |
| { |
| log->Printf ("Found a resolver stub for: \"%s\" but could not find any symbols it resolves to.", |
| trampoline_name.AsCString()); |
| } |
| } |
| } |
| else |
| { |
| if (log) |
| { |
| log->Printf ("Could not find symbol for trampoline target: \"%s\"", trampoline_name.AsCString()); |
| } |
| } |
| } |
| } |
| } |
| else |
| { |
| if (log) |
| log->Printf ("Could not find symbol for step through."); |
| } |
| |
| return thread_plan_sp; |
| } |
| |
| size_t |
| DynamicLoaderMacOSXDYLD::FindEquivalentSymbols (lldb_private::Symbol *original_symbol, |
| lldb_private::ModuleList &images, |
| lldb_private::SymbolContextList &equivalent_symbols) |
| { |
| const ConstString &trampoline_name = original_symbol->GetMangled().GetName(Mangled::ePreferMangled); |
| if (!trampoline_name) |
| return 0; |
| |
| size_t initial_size = equivalent_symbols.GetSize(); |
| |
| static const char *resolver_name_regex = "(_gc|_non_gc|\\$[A-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; |
| } |
| |
| Error |
| DynamicLoaderMacOSXDYLD::CanLoadImage () |
| { |
| Error error; |
| // In order for us to tell if we can load a shared library we verify that |
| // the dylib_info_addr isn't zero (which means no shared libraries have |
| // been set yet, or dyld is currently mucking with the shared library list). |
| if (ReadAllImageInfosStructure ()) |
| { |
| // TODO: also check the _dyld_global_lock_held variable in libSystem.B.dylib? |
| // TODO: check the malloc lock? |
| // TODO: check the objective C lock? |
| if (m_dyld_all_image_infos.dylib_info_addr != 0) |
| return error; // Success |
| } |
| |
| error.SetErrorString("unsafe to load or unload shared libraries"); |
| return error; |
| } |
| |
| void |
| DynamicLoaderMacOSXDYLD::Initialize() |
| { |
| PluginManager::RegisterPlugin (GetPluginNameStatic(), |
| GetPluginDescriptionStatic(), |
| CreateInstance); |
| } |
| |
| void |
| DynamicLoaderMacOSXDYLD::Terminate() |
| { |
| PluginManager::UnregisterPlugin (CreateInstance); |
| } |
| |
| |
| const char * |
| DynamicLoaderMacOSXDYLD::GetPluginNameStatic() |
| { |
| return "dynamic-loader.macosx-dyld"; |
| } |
| |
| const char * |
| DynamicLoaderMacOSXDYLD::GetPluginDescriptionStatic() |
| { |
| return "Dynamic loader plug-in that watches for shared library loads/unloads in MacOSX user processes."; |
| } |
| |
| |
| //------------------------------------------------------------------ |
| // PluginInterface protocol |
| //------------------------------------------------------------------ |
| const char * |
| DynamicLoaderMacOSXDYLD::GetPluginName() |
| { |
| return "DynamicLoaderMacOSXDYLD"; |
| } |
| |
| const char * |
| DynamicLoaderMacOSXDYLD::GetShortPluginName() |
| { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t |
| DynamicLoaderMacOSXDYLD::GetPluginVersion() |
| { |
| return 1; |
| } |
| |
