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

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//===-- 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 "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;
using namespace llvm::MachO;
/// 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.
//----------------------------------------------------------------------
// 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)
{
return new DynamicLoaderMacOSXDYLD (process);
}
//----------------------------------------------------------------------
// Constructor
//----------------------------------------------------------------------
DynamicLoaderMacOSXDYLD::DynamicLoaderMacOSXDYLD (Process* process) :
DynamicLoader(process),
m_dyld(),
m_dyld_all_image_infos_addr(LLDB_INVALID_ADDRESS),
m_dyld_all_image_infos(),
m_break_id(LLDB_INVALID_BREAK_ID),
m_dyld_image_infos(),
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);
if (NeedToLocateDYLD ())
LocateDYLD ();
SetNotificationBreakpoint ();
UpdateAllImageInfos();
}
//------------------------------------------------------------------
/// Called after attaching a process.
///
/// Allow DynamicLoader plug-ins to execute some code after
/// attaching to a process.
//------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::DidLaunch ()
{
PrivateInitialize(m_process);
if (NeedToLocateDYLD ())
LocateDYLD ();
SetNotificationBreakpoint ();
UpdateAllImageInfos();
}
//----------------------------------------------------------------------
// 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)
m_dyld_all_image_infos_addr = m_process->GetImageInfoAddress ();
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().GetExecutableModule().get();
if (executable)
{
if (executable->GetArchitecture().GetAddressByteSize() == 8)
{
return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x7fff5fc00000ull);
}
#if defined (__arm__)
else
{
ArchSpec arm_arch("arm");
if (arm_arch == executable->Arch())
return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x2fe00000);
}
#endif
return ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x8fe00000);
}
return false;
}
//----------------------------------------------------------------------
// 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 == HeaderFileTypeDynamicLinkEditor)
{
m_dyld.address = addr;
ModuleSP dyld_module_sp;
if (ParseLoadCommands (data, m_dyld, &m_dyld.file_spec))
{
if (m_dyld.file_spec)
{
ArchSpec dyld_arch(eArchTypeMachO, m_dyld.header.cputype, m_dyld.header.cpusubtype);
dyld_module_sp = m_process->GetTarget().GetImages().FindFirstModuleForFileSpec (m_dyld.file_spec);
if (dyld_module_sp.get() == NULL || dyld_module_sp->GetArchitecture() != dyld_arch)
{
dyld_module_sp = m_process->GetTarget().GetSharedModule (m_dyld.file_spec,
dyld_arch,
&m_dyld.uuid);
}
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->GetValue().GetLoadAddress(&m_process->GetTarget());
}
// Update all image infos
UpdateAllImageInfos();
// 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 (m_process->GetTarget().GetImages().AppendInNeeded (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, struct 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)
{
// 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)
info.slide = 0;
const size_t num_sections = section_list->GetSize();
size_t sect_idx = 0;
for (sect_idx = 0; sect_idx < num_sections; ++sect_idx)
{
// Iterate through the object file sections to find the
// first section that starts of file offset zero and that
// has bytes in the file...
Section *section = section_list->GetSectionAtIndex (sect_idx).get();
if (section)
{
// Find the first section that begins at file offset zero
// a file size (skip page zero).
if (section->GetFileOffset() == 0 && section->GetFileSize() > 0)
{
// We have now found the section, lets match it up
// with the section in the dyld image info structure.
const Segment *dyld_segment = info.FindSegment (section->GetName());
if (dyld_segment)
info.slide = info.address - dyld_segment->addr;
// We have found the slide amount, so we can exit
// this for loop.
break;
}
}
}
// 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)
{
SectionSP section_sp(section_list->FindSectionByName(info.segments[i].name));
assert (section_sp.get() != NULL);
const addr_t new_section_load_addr = info.segments[i].addr + info.slide;
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))
changed = true;
}
}
}
}
}
return changed;
}
//----------------------------------------------------------------------
// Update the load addresses for all segments in MODULE using the
// updated INFO that is passed in.
//----------------------------------------------------------------------
bool
DynamicLoaderMacOSXDYLD::UnloadImageLoadAddress (Module *module, struct 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));
assert (section_sp.get() != NULL);
const addr_t old_section_load_addr = info.segments[i].addr + info.slide;
if (m_process->GetTarget().GetSectionLoadList().SetSectionUnloaded (section_sp.get(), old_section_load_addr))
changed = true;
}
}
}
}
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
DynamicLoaderMacOSXDYLD* dyld_instance = (DynamicLoaderMacOSXDYLD*) baton;
dyld_instance->UpdateAllImageInfos();
// 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);
m_dyld_all_image_infos.Clear();
if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS)
{
const ByteOrder endian = m_process->GetByteOrder();
const uint32_t addr_size = m_process->GetAddressByteSize();
uint8_t buf[256];
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)
{
DataExtractor data(buf, 4, endian, addr_size);
uint32_t 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)
{
DataExtractor data(buf, count, endian, addr_size);
uint32_t 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;
}
}
return true;
}
}
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).
//----------------------------------------------------------------------
uint32_t
DynamicLoaderMacOSXDYLD::UpdateAllImageInfos()
{
Log *log = lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER);
if (ReadAllImageInfosStructure ())
{
Mutex::Locker locker(m_mutex);
uint32_t idx;
uint32_t i = 0;
DYLDImageInfo::collection old_dyld_all_image_infos;
old_dyld_all_image_infos.swap(m_dyld_image_infos);
// If we made it here, we are assuming that the all dylib info data should
// be valid, lets read the info array.
const ByteOrder endian = m_process->GetByteOrder();
const uint32_t addr_size = m_process->GetAddressByteSize();
if (m_dyld_all_image_infos.dylib_info_count > 0)
{
if (m_dyld_all_image_infos.dylib_info_addr == 0)
{
// DYLD is updating the images right now...
}
else
{
m_dyld_image_infos.resize(m_dyld_all_image_infos.dylib_info_count);
const size_t count = m_dyld_image_infos.size() * 3 * addr_size;
DataBufferHeap info_data(count, 0);
Error error;
const size_t bytes_read = m_process->ReadMemory (m_dyld_all_image_infos.dylib_info_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 (i = 0; info_data_ref.ValidOffset(info_data_offset); i++)
{
assert (i < m_dyld_image_infos.size());
m_dyld_image_infos[i].address = info_data_ref.GetPointer(&info_data_offset);
lldb::addr_t path_addr = info_data_ref.GetPointer(&info_data_offset);
m_dyld_image_infos[i].mod_date = info_data_ref.GetPointer(&info_data_offset);
char raw_path[PATH_MAX];
m_process->ReadMemory (path_addr, raw_path, sizeof(raw_path), error);
m_dyld_image_infos[i].file_spec.SetFile(raw_path, true);
}
assert(i == m_dyld_all_image_infos.dylib_info_count);
UpdateAllImageInfosHeaderAndLoadCommands();
}
else
{
DEBUG_PRINTF( "unable to read all data for all_dylib_infos.");
m_dyld_image_infos.clear();
}
}
}
else
{
m_dyld_image_infos.clear();
}
// If our new list is smaller than our old list, we have unloaded
// some shared libraries
if (m_dyld_image_infos.size() < old_dyld_all_image_infos.size())
{
ModuleList unloaded_module_list;
uint32_t old_idx;
for (idx = 0; idx < old_dyld_all_image_infos.size(); ++idx)
{
for (old_idx = idx; old_idx < old_dyld_all_image_infos.size(); ++old_idx)
{
if (m_dyld_image_infos[idx].file_spec == old_dyld_all_image_infos[old_idx].file_spec)
{
old_dyld_all_image_infos[old_idx].address = LLDB_INVALID_ADDRESS;
break;
}
}
}
if (log)
log->PutCString("Unloaded:");
for (old_idx = 0; old_idx < old_dyld_all_image_infos.size(); ++old_idx)
{
if (old_dyld_all_image_infos[old_idx].address != LLDB_INVALID_ADDRESS)
{
if (log)
old_dyld_all_image_infos[old_idx].PutToLog (log);
ModuleSP unload_image_module_sp(m_process->GetTarget().GetImages().FindFirstModuleForFileSpec (old_dyld_all_image_infos[old_idx].file_spec));
if (unload_image_module_sp.get())
{
if (UnloadImageLoadAddress (unload_image_module_sp.get(), old_dyld_all_image_infos[old_idx]))
unloaded_module_list.AppendInNeeded (unload_image_module_sp);
}
}
}
if (unloaded_module_list.GetSize() > 0)
m_process->GetTarget().ModulesDidUnload (unloaded_module_list);
}
else
{
if (log)
PutToLog(log);
}
}
else
{
m_dyld_image_infos.clear();
}
const uint32_t num_dylibs = m_dyld_image_infos.size();
if (num_dylibs > 0)
{
ModuleList loaded_module_list;
for (uint32_t idx = 0; idx<num_dylibs; ++idx)
{
ArchSpec arch_spec(eArchTypeMachO, m_dyld_image_infos[idx].header.cputype, m_dyld_image_infos[idx].header.cpusubtype);
ModuleSP image_module_sp(m_process->GetTarget().GetImages().FindFirstModuleForFileSpec (m_dyld_image_infos[idx].file_spec));
if (image_module_sp.get() == NULL || image_module_sp->GetArchitecture() != arch_spec)
{
image_module_sp = m_process->GetTarget().GetSharedModule (m_dyld_image_infos[idx].file_spec,
arch_spec,
&m_dyld_image_infos[idx].uuid);
}
if (image_module_sp)
{
if (m_dyld_image_infos[idx].header.filetype == 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)
{
FileSpec objfile_file_spec(objfile->GetFileSpec());
ModuleSP commpage_image_module_sp(m_process->GetTarget().GetImages().FindFirstModuleForFileSpec (objfile_file_spec, &commpage_dbstr));
if (commpage_image_module_sp.get() == NULL)
{
commpage_image_module_sp = m_process->GetTarget().GetSharedModule (m_dyld_image_infos[idx].file_spec,
arch_spec,
&m_dyld_image_infos[idx].uuid,
&commpage_dbstr,
objfile->GetOffset() + commpage_section->GetOffset());
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(), m_dyld_image_infos[idx]))
{
loaded_module_list.AppendInNeeded (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();
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;
}
}
}
m_process->GetTarget().ModulesDidLoad (loaded_module_list);
}
}
return m_dyld_image_infos.size();
}
//----------------------------------------------------------------------
// 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, mach_header *header, DataExtractor *load_command_data)
{
DataBufferHeap header_bytes(sizeof(mach_header), 0);
Error error;
size_t bytes_read = m_process->ReadMemory (addr,
header_bytes.GetBytes(),
header_bytes.GetByteSize(),
error);
if (bytes_read == sizeof(mach_header))
{
uint32_t offset = 0;
::memset (header, 0, sizeof(header));
// Get the magic byte unswapped so we can figure out what we are dealing with
DataExtractor data(header_bytes.GetBytes(), header_bytes.GetByteSize(), eByteOrderHost, 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(mach_header);
break;
case llvm::MachO::HeaderMagic64:
case llvm::MachO::HeaderMagic64Swapped:
data.SetAddressByteSize(8);
load_cmd_addr += sizeof(mach_header_64);
break;
default:
return false;
}
// Read the rest of dyld's mach header
if (data.GetU32(&offset, &header->cputype, (sizeof(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, struct 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(load_command)))
{
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 LoadCommandSegment32:
{
segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16);
segment.addr = data.GetU32 (&offset);
segment.size = data.GetU32 (&offset);
dylib_info.segments.push_back (segment);
}
break;
case LoadCommandSegment64:
{
segment.name.SetTrimmedCStringWithLength ((const char *)data.GetData(&offset, 16), 16);
segment.addr = data.GetU64 (&offset);
segment.size = data.GetU64 (&offset);
dylib_info.segments.push_back (segment);
}
break;
case 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 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;
}
}
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::UpdateAllImageInfosHeaderAndLoadCommands()
{
uint32_t exe_idx = UINT32_MAX;
// Read any UUID values that we can get
for (uint32_t i = 0; i < m_dyld_all_image_infos.dylib_info_count; i++)
{
if (!m_dyld_image_infos[i].UUIDValid())
{
DataExtractor data; // Load command data
if (!ReadMachHeader (m_dyld_image_infos[i].address, &m_dyld_image_infos[i].header, &data))
continue;
ParseLoadCommands (data, m_dyld_image_infos[i], NULL);
if (m_dyld_image_infos[i].header.filetype == HeaderFileTypeExecutable)
exe_idx = i;
}
}
if (exe_idx < m_dyld_image_infos.size())
{
bool set_executable = false;
ArchSpec dyld_exe_arch_spec(eArchTypeMachO, m_dyld_image_infos[exe_idx].header.cputype, m_dyld_image_infos[exe_idx].header.cpusubtype);
ModuleSP exe_module_sp(m_process->GetTarget().GetExecutableModule());
if (exe_module_sp.get())
{
if (exe_module_sp->GetFileSpec() != m_dyld_image_infos[exe_idx].file_spec ||
exe_module_sp->GetArchitecture() != dyld_exe_arch_spec)
set_executable = true;
}
else
set_executable = true;
if (set_executable)
{
exe_module_sp = m_process->GetTarget().GetSharedModule (m_dyld_image_infos[exe_idx].file_spec,
dyld_exe_arch_spec,
&m_dyld_image_infos[exe_idx].uuid);
if (exe_module_sp.get())
{
// If we found the file where it purported to be, then it should
// be safe to load dependent images.
bool get_dependent_images = exe_module_sp->GetFileSpec() == m_dyld_image_infos[exe_idx].file_spec;
m_process->GetTarget().SetExecutableModule (exe_module_sp, get_dependent_images);
}
}
}
}
//----------------------------------------------------------------------
// Dump a Segment to the file handle provided.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::Segment::PutToLog (Log *log, lldb::addr_t slide) const
{
if (log)
log->Printf("\t\t%16s [0x%16.16llx - 0x%16.16llx)", name.AsCString(""), addr + slide, addr + slide + size);
}
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);
}
}
//----------------------------------------------------------------------
// Static callback function that gets called when the process state
// changes.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::Initialize(void *baton, Process *process)
{
((DynamicLoaderMacOSXDYLD*)baton)->PrivateInitialize(process);
}
void
DynamicLoaderMacOSXDYLD::PrivateInitialize(Process *process)
{
DEBUG_PRINTF("DynamicLoaderMacOSXDYLD::%s() process state = %s\n", __FUNCTION__, StateAsCString(m_process->GetState()));
Clear(true);
m_process = process;
}
//----------------------------------------------------------------------
// Static callback function that gets called when the process state
// changes.
//----------------------------------------------------------------------
void
DynamicLoaderMacOSXDYLD::ProcessStateChanged(void *baton, Process *process, StateType state)
{
((DynamicLoaderMacOSXDYLD*)baton)->PrivateProcessStateChanged(process, state);
}
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 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;
}
}
ThreadPlanSP
DynamicLoaderMacOSXDYLD::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);
if (current_symbol != NULL)
{
if (current_symbol->IsTrampoline())
{
const ConstString &trampoline_name = current_symbol->GetMangled().GetName(Mangled::ePreferMangled);
if (trampoline_name)
{
SymbolContextList target_symbols;
ModuleList &images = thread.GetProcess().GetTarget().GetImages();
images.FindSymbolsWithNameAndType(trampoline_name, eSymbolTypeCode, 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 == 1)
{
SymbolContext context;
AddressRange addr_range;
if (target_symbols.GetContextAtIndex(0, context))
{
context.GetAddressRange (eSymbolContextEverything, addr_range);
thread_plan_sp.reset (new ThreadPlanRunToAddress (thread, addr_range.GetBaseAddress(), stop_others));
}
else
{
if (log)
log->Printf ("Couldn't resolve the symbol context.");
}
}
else if (num_symbols > 1)
{
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, addr_range);
lldb::addr_t load_addr = addr_range.GetBaseAddress().GetLoadAddress(&thread.GetProcess().GetTarget());
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 ("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;
}
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;
}
void
DynamicLoaderMacOSXDYLD::GetPluginCommandHelp (const char *command, Stream *strm)
{
}
Error
DynamicLoaderMacOSXDYLD::ExecutePluginCommand (Args &command, Stream *strm)
{
Error error;
error.SetErrorString("No plug-in command are currently supported.");
return error;
}
Log *
DynamicLoaderMacOSXDYLD::EnablePluginLogging (Stream *strm, Args &command)
{
return NULL;
}
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