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llvm-project/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderDarwin.cpp

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//===-- 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 "DynamicLoaderDarwin.h"
#include "lldb/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Core/Debugger.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/Host/FileSystem.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 "lldb/Utility/DataBuffer.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Log.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
#ifndef __APPLE__
#include "Utility/UuidCompatibility.h"
#else
#include <uuid/uuid.h>
#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<std::recursive_mutex> 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() !=
FileSystem::GetModificationTime(module_sp->GetFileSpec()))
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<lldb::addr_t> &solib_addresses) {
std::lock_guard<std::recursive_mutex> 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<std::recursive_mutex> 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<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.
const size_t num_segments = info.segments.size();
for (size_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;
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("<invalid>"),
(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; 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);
}
}
}
}
}
}
}
// 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; 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().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("<invalid>"),
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(), 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());
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.SetFromStringRef(
image->GetValueForKey("uuid")->GetAsString()->GetValue());
// 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 {
// catch-all for any other environment -- trust that dyld is actually dyld
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<std::recursive_mutex> 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; 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 DynamicLoaderDarwin::ImageInfo::PutToLog(Log *log) const {
if (log == NULL)
return;
const uint8_t *u = (const uint8_t *)uuid.GetBytes();
if (address == LLDB_INVALID_ADDRESS) {
if (u) {
log->Printf("\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; i < segments.size(); ++i)
segments[i].PutToLog(log, slide);
}
}
void DynamicLoaderDarwin::PrivateInitialize(Process *process) {
DEBUG_PRINTF("DynamicLoaderDarwin::%s() process state = %s\n", __FUNCTION__,
StateAsCString(m_process->GetState()));
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 &current_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<Address> 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<lldb::addr_t> load_addrs;
for (Address address : addresses) {
Symbol *symbol = address.CalculateSymbolContextSymbol();
if (symbol && symbol->IsIndirect()) {
Status 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);
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<std::recursive_mutex> 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)) {
Status 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<lldb::addr_t>(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;
}
}
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;
}
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