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1186 lines
46 KiB
1186 lines
46 KiB
4 months ago
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//===-- DynamicLoaderMacOSXDYLD.cpp ---------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "DynamicLoaderMacOSXDYLD.h"
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#include "DynamicLoaderDarwin.h"
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#include "DynamicLoaderMacOS.h"
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#include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
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#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
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#include "lldb/Breakpoint/StoppointCallbackContext.h"
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/ModuleSpec.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/Section.h"
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#include "lldb/Symbol/Function.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Target/ABI.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/StackFrame.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Target/ThreadPlanRunToAddress.h"
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#include "lldb/Utility/DataBuffer.h"
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#include "lldb/Utility/DataBufferHeap.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/State.h"
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//#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN
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#ifdef ENABLE_DEBUG_PRINTF
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#include <stdio.h>
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#define DEBUG_PRINTF(fmt, ...) printf(fmt, ##__VA_ARGS__)
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#else
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#define DEBUG_PRINTF(fmt, ...)
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#endif
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#ifndef __APPLE__
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#include "Utility/UuidCompatibility.h"
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#else
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#include <uuid/uuid.h>
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#endif
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using namespace lldb;
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using namespace lldb_private;
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LLDB_PLUGIN_DEFINE(DynamicLoaderMacOSXDYLD)
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// Create an instance of this class. This function is filled into the plugin
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// info class that gets handed out by the plugin factory and allows the lldb to
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// instantiate an instance of this class.
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DynamicLoader *DynamicLoaderMacOSXDYLD::CreateInstance(Process *process,
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bool force) {
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bool create = force;
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if (!create) {
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create = true;
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Module *exe_module = process->GetTarget().GetExecutableModulePointer();
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if (exe_module) {
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ObjectFile *object_file = exe_module->GetObjectFile();
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if (object_file) {
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create = (object_file->GetStrata() == ObjectFile::eStrataUser);
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}
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}
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if (create) {
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const llvm::Triple &triple_ref =
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process->GetTarget().GetArchitecture().GetTriple();
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switch (triple_ref.getOS()) {
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case llvm::Triple::Darwin:
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case llvm::Triple::MacOSX:
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case llvm::Triple::IOS:
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case llvm::Triple::TvOS:
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case llvm::Triple::WatchOS:
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// NEED_BRIDGEOS_TRIPLE case llvm::Triple::BridgeOS:
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create = triple_ref.getVendor() == llvm::Triple::Apple;
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break;
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default:
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create = false;
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break;
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}
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}
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}
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if (UseDYLDSPI(process)) {
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create = false;
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}
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if (create)
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return new DynamicLoaderMacOSXDYLD(process);
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return nullptr;
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}
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// Constructor
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DynamicLoaderMacOSXDYLD::DynamicLoaderMacOSXDYLD(Process *process)
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: DynamicLoaderDarwin(process),
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m_dyld_all_image_infos_addr(LLDB_INVALID_ADDRESS),
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m_dyld_all_image_infos(), m_dyld_all_image_infos_stop_id(UINT32_MAX),
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m_break_id(LLDB_INVALID_BREAK_ID), m_mutex(),
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m_process_image_addr_is_all_images_infos(false) {}
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// Destructor
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DynamicLoaderMacOSXDYLD::~DynamicLoaderMacOSXDYLD() {
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if (LLDB_BREAK_ID_IS_VALID(m_break_id))
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m_process->GetTarget().RemoveBreakpointByID(m_break_id);
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}
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bool DynamicLoaderMacOSXDYLD::ProcessDidExec() {
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std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
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bool did_exec = false;
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if (m_process) {
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// If we are stopped after an exec, we will have only one thread...
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if (m_process->GetThreadList().GetSize() == 1) {
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// We know if a process has exec'ed if our "m_dyld_all_image_infos_addr"
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// value differs from the Process' image info address. When a process
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// execs itself it might cause a change if ASLR is enabled.
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const addr_t shlib_addr = m_process->GetImageInfoAddress();
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if (m_process_image_addr_is_all_images_infos &&
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shlib_addr != m_dyld_all_image_infos_addr) {
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// The image info address from the process is the
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// 'dyld_all_image_infos' address and it has changed.
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did_exec = true;
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} else if (!m_process_image_addr_is_all_images_infos &&
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shlib_addr == m_dyld.address) {
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// The image info address from the process is the mach_header address
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// for dyld and it has changed.
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did_exec = true;
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} else {
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// ASLR might be disabled and dyld could have ended up in the same
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// location. We should try and detect if we are stopped at
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// '_dyld_start'
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ThreadSP thread_sp(m_process->GetThreadList().GetThreadAtIndex(0));
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if (thread_sp) {
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lldb::StackFrameSP frame_sp(thread_sp->GetStackFrameAtIndex(0));
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if (frame_sp) {
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const Symbol *symbol =
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frame_sp->GetSymbolContext(eSymbolContextSymbol).symbol;
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if (symbol) {
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if (symbol->GetName() == "_dyld_start")
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did_exec = true;
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}
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}
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}
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}
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if (did_exec) {
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m_libpthread_module_wp.reset();
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m_pthread_getspecific_addr.Clear();
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}
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}
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}
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return did_exec;
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}
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// Clear out the state of this class.
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void DynamicLoaderMacOSXDYLD::DoClear() {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (LLDB_BREAK_ID_IS_VALID(m_break_id))
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m_process->GetTarget().RemoveBreakpointByID(m_break_id);
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m_dyld_all_image_infos_addr = LLDB_INVALID_ADDRESS;
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m_dyld_all_image_infos.Clear();
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m_break_id = LLDB_INVALID_BREAK_ID;
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}
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// Check if we have found DYLD yet
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bool DynamicLoaderMacOSXDYLD::DidSetNotificationBreakpoint() {
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return LLDB_BREAK_ID_IS_VALID(m_break_id);
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}
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void DynamicLoaderMacOSXDYLD::ClearNotificationBreakpoint() {
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if (LLDB_BREAK_ID_IS_VALID(m_break_id)) {
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m_process->GetTarget().RemoveBreakpointByID(m_break_id);
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}
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}
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// Try and figure out where dyld is by first asking the Process if it knows
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// (which currently calls down in the lldb::Process to get the DYLD info
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// (available on SnowLeopard only). If that fails, then check in the default
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// addresses.
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void DynamicLoaderMacOSXDYLD::DoInitialImageFetch() {
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if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS) {
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// Check the image info addr as it might point to the mach header for dyld,
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// or it might point to the dyld_all_image_infos struct
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const addr_t shlib_addr = m_process->GetImageInfoAddress();
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if (shlib_addr != LLDB_INVALID_ADDRESS) {
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ByteOrder byte_order =
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m_process->GetTarget().GetArchitecture().GetByteOrder();
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uint8_t buf[4];
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DataExtractor data(buf, sizeof(buf), byte_order, 4);
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Status error;
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if (m_process->ReadMemory(shlib_addr, buf, 4, error) == 4) {
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lldb::offset_t offset = 0;
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uint32_t magic = data.GetU32(&offset);
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switch (magic) {
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case llvm::MachO::MH_MAGIC:
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case llvm::MachO::MH_MAGIC_64:
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case llvm::MachO::MH_CIGAM:
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case llvm::MachO::MH_CIGAM_64:
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m_process_image_addr_is_all_images_infos = false;
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ReadDYLDInfoFromMemoryAndSetNotificationCallback(shlib_addr);
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return;
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default:
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break;
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}
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}
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// Maybe it points to the all image infos?
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m_dyld_all_image_infos_addr = shlib_addr;
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m_process_image_addr_is_all_images_infos = true;
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}
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}
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if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS) {
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if (ReadAllImageInfosStructure()) {
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if (m_dyld_all_image_infos.dyldImageLoadAddress != LLDB_INVALID_ADDRESS)
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ReadDYLDInfoFromMemoryAndSetNotificationCallback(
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m_dyld_all_image_infos.dyldImageLoadAddress);
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else
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ReadDYLDInfoFromMemoryAndSetNotificationCallback(
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m_dyld_all_image_infos_addr & 0xfffffffffff00000ull);
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return;
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}
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}
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// Check some default values
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Module *executable = m_process->GetTarget().GetExecutableModulePointer();
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if (executable) {
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const ArchSpec &exe_arch = executable->GetArchitecture();
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if (exe_arch.GetAddressByteSize() == 8) {
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ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x7fff5fc00000ull);
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} else if (exe_arch.GetMachine() == llvm::Triple::arm ||
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exe_arch.GetMachine() == llvm::Triple::thumb ||
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exe_arch.GetMachine() == llvm::Triple::aarch64 ||
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exe_arch.GetMachine() == llvm::Triple::aarch64_32) {
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ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x2fe00000);
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} else {
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ReadDYLDInfoFromMemoryAndSetNotificationCallback(0x8fe00000);
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}
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}
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return;
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}
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// Assume that dyld is in memory at ADDR and try to parse it's load commands
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bool DynamicLoaderMacOSXDYLD::ReadDYLDInfoFromMemoryAndSetNotificationCallback(
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lldb::addr_t addr) {
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std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
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DataExtractor data; // Load command data
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static ConstString g_dyld_all_image_infos("dyld_all_image_infos");
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if (ReadMachHeader(addr, &m_dyld.header, &data)) {
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if (m_dyld.header.filetype == llvm::MachO::MH_DYLINKER) {
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m_dyld.address = addr;
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ModuleSP dyld_module_sp;
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if (ParseLoadCommands(data, m_dyld, &m_dyld.file_spec)) {
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if (m_dyld.file_spec) {
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UpdateDYLDImageInfoFromNewImageInfo(m_dyld);
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}
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}
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dyld_module_sp = GetDYLDModule();
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Target &target = m_process->GetTarget();
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if (m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS &&
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dyld_module_sp.get()) {
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const Symbol *symbol = dyld_module_sp->FindFirstSymbolWithNameAndType(
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g_dyld_all_image_infos, eSymbolTypeData);
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if (symbol)
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m_dyld_all_image_infos_addr = symbol->GetLoadAddress(&target);
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}
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// Update all image infos
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InitializeFromAllImageInfos();
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// If we didn't have an executable before, but now we do, then the dyld
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// module shared pointer might be unique and we may need to add it again
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// (since Target::SetExecutableModule() will clear the images). So append
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// the dyld module back to the list if it is
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/// unique!
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if (dyld_module_sp) {
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target.GetImages().AppendIfNeeded(dyld_module_sp);
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// At this point we should have read in dyld's module, and so we should
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// set breakpoints in it:
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ModuleList modules;
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modules.Append(dyld_module_sp);
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target.ModulesDidLoad(modules);
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SetDYLDModule(dyld_module_sp);
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}
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return true;
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}
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}
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return false;
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}
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bool DynamicLoaderMacOSXDYLD::NeedToDoInitialImageFetch() {
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return m_dyld_all_image_infos_addr == LLDB_INVALID_ADDRESS;
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}
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// Static callback function that gets called when our DYLD notification
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// breakpoint gets hit. We update all of our image infos and then let our super
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// class DynamicLoader class decide if we should stop or not (based on global
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// preference).
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bool DynamicLoaderMacOSXDYLD::NotifyBreakpointHit(
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void *baton, StoppointCallbackContext *context, lldb::user_id_t break_id,
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lldb::user_id_t break_loc_id) {
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// Let the event know that the images have changed
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// DYLD passes three arguments to the notification breakpoint.
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// Arg1: enum dyld_image_mode mode - 0 = adding, 1 = removing Arg2: uint32_t
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// infoCount - Number of shared libraries added Arg3: dyld_image_info
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// info[] - Array of structs of the form:
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// const struct mach_header
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// *imageLoadAddress
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// const char *imageFilePath
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// uintptr_t imageFileModDate (a time_t)
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DynamicLoaderMacOSXDYLD *dyld_instance = (DynamicLoaderMacOSXDYLD *)baton;
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// First step is to see if we've already initialized the all image infos. If
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// we haven't then this function will do so and return true. In the course
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// of initializing the all_image_infos it will read the complete current
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// state, so we don't need to figure out what has changed from the data
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// passed in to us.
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ExecutionContext exe_ctx(context->exe_ctx_ref);
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Process *process = exe_ctx.GetProcessPtr();
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||
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// This is a sanity check just in case this dyld_instance is an old dyld
|
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// plugin's breakpoint still lying around.
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if (process != dyld_instance->m_process)
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return false;
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if (dyld_instance->InitializeFromAllImageInfos())
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return dyld_instance->GetStopWhenImagesChange();
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||
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const lldb::ABISP &abi = process->GetABI();
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if (abi) {
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// Build up the value array to store the three arguments given above, then
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// get the values from the ABI:
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||
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TypeSystemClang *clang_ast_context =
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ScratchTypeSystemClang::GetForTarget(process->GetTarget());
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if (!clang_ast_context)
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return false;
|
||
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|
||
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ValueList argument_values;
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Value input_value;
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||
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|
||
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CompilerType clang_void_ptr_type =
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clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
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||
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CompilerType clang_uint32_type =
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clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
|
||
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lldb::eEncodingUint, 32);
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||
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input_value.SetValueType(Value::eValueTypeScalar);
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||
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input_value.SetCompilerType(clang_uint32_type);
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// input_value.SetContext (Value::eContextTypeClangType,
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||
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// clang_uint32_type);
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argument_values.PushValue(input_value);
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argument_values.PushValue(input_value);
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input_value.SetCompilerType(clang_void_ptr_type);
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// input_value.SetContext (Value::eContextTypeClangType,
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||
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// clang_void_ptr_type);
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argument_values.PushValue(input_value);
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||
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||
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if (abi->GetArgumentValues(exe_ctx.GetThreadRef(), argument_values)) {
|
||
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uint32_t dyld_mode =
|
||
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argument_values.GetValueAtIndex(0)->GetScalar().UInt(-1);
|
||
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if (dyld_mode != static_cast<uint32_t>(-1)) {
|
||
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// Okay the mode was right, now get the number of elements, and the
|
||
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// array of new elements...
|
||
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uint32_t image_infos_count =
|
||
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argument_values.GetValueAtIndex(1)->GetScalar().UInt(-1);
|
||
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if (image_infos_count != static_cast<uint32_t>(-1)) {
|
||
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// Got the number added, now go through the array of added elements,
|
||
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// putting out the mach header address, and adding the image. Note,
|
||
|
// I'm not putting in logging here, since the AddModules &
|
||
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// RemoveModules functions do all the logging internally.
|
||
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|
||
|
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);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
} else {
|
||
|
process->GetTarget().GetDebugger().GetAsyncErrorStream()->Printf(
|
||
|
"No ABI plugin located for triple %s -- shared libraries will not be "
|
||
|
"registered!\n",
|
||
|
process->GetTarget().GetArchitecture().GetTriple().getTriple().c_str());
|
||
|
}
|
||
|
|
||
|
// Return true to stop the target, false to just let the target run
|
||
|
return dyld_instance->GetStopWhenImagesChange();
|
||
|
}
|
||
|
|
||
|
bool DynamicLoaderMacOSXDYLD::ReadAllImageInfosStructure() {
|
||
|
std::lock_guard<std::recursive_mutex> guard(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 =
|
||
|
m_process->GetTarget().GetArchitecture().GetAddressByteSize();
|
||
|
|
||
|
uint8_t buf[256];
|
||
|
DataExtractor data(buf, sizeof(buf), byte_order, addr_size);
|
||
|
lldb::offset_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
|
||
|
const size_t count_v13 = count_v11 + addr_size + // sharedCacheSlide
|
||
|
sizeof(uuid_t); // sharedCacheUUID
|
||
|
UNUSED_IF_ASSERT_DISABLED(count_v13);
|
||
|
assert(sizeof(buf) >= count_v13);
|
||
|
|
||
|
Status 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;
|
||
|
}
|
||
|
|
||
|
const size_t count =
|
||
|
(m_dyld_all_image_infos.version >= 11) ? count_v11 : 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.GetAddress(&offset);
|
||
|
m_dyld_all_image_infos.notification = data.GetAddress(&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.GetAddress(&offset);
|
||
|
if (m_dyld_all_image_infos.version >= 11) {
|
||
|
offset += addr_size * 8;
|
||
|
uint64_t dyld_all_image_infos_addr = data.GetAddress(&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) {
|
||
|
ImageInfo::collection image_infos;
|
||
|
Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
||
|
LLDB_LOGF(log, "Adding %d modules.\n", image_infos_count);
|
||
|
|
||
|
std::lock_guard<std::recursive_mutex> guard(m_mutex);
|
||
|
std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
|
||
|
if (m_process->GetStopID() == m_dyld_image_infos_stop_id)
|
||
|
return true;
|
||
|
|
||
|
StructuredData::ObjectSP image_infos_json_sp =
|
||
|
m_process->GetLoadedDynamicLibrariesInfos(image_infos_addr,
|
||
|
image_infos_count);
|
||
|
if (image_infos_json_sp.get() && image_infos_json_sp->GetAsDictionary() &&
|
||
|
image_infos_json_sp->GetAsDictionary()->HasKey("images") &&
|
||
|
image_infos_json_sp->GetAsDictionary()
|
||
|
->GetValueForKey("images")
|
||
|
->GetAsArray() &&
|
||
|
image_infos_json_sp->GetAsDictionary()
|
||
|
->GetValueForKey("images")
|
||
|
->GetAsArray()
|
||
|
->GetSize() == image_infos_count) {
|
||
|
bool return_value = false;
|
||
|
if (JSONImageInformationIntoImageInfo(image_infos_json_sp, image_infos)) {
|
||
|
UpdateSpecialBinariesFromNewImageInfos(image_infos);
|
||
|
return_value = AddModulesUsingImageInfos(image_infos);
|
||
|
}
|
||
|
m_dyld_image_infos_stop_id = m_process->GetStopID();
|
||
|
return return_value;
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
bool DynamicLoaderMacOSXDYLD::RemoveModulesUsingImageInfosAddress(
|
||
|
lldb::addr_t image_infos_addr, uint32_t image_infos_count) {
|
||
|
ImageInfo::collection image_infos;
|
||
|
Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
||
|
|
||
|
std::lock_guard<std::recursive_mutex> guard(m_mutex);
|
||
|
std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
LLDB_LOGF(log, "Removing %d modules.", image_infos_count);
|
||
|
|
||
|
ModuleList unloaded_module_list;
|
||
|
for (uint32_t idx = 0; idx < image_infos.size(); ++idx) {
|
||
|
if (log) {
|
||
|
LLDB_LOGF(log, "Removing module at address=0x%16.16" PRIx64 ".",
|
||
|
image_infos[idx].address);
|
||
|
image_infos[idx].PutToLog(log);
|
||
|
}
|
||
|
|
||
|
// Remove this image_infos from the m_all_image_infos. We do the
|
||
|
// comparison 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.
|
||
|
|
||
|
ImageInfo::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(
|
||
|
FindTargetModuleForImageInfo(image_infos[idx], false, nullptr));
|
||
|
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.
|
||
|
UnloadModuleSections(unload_image_module_sp.get(), *pos);
|
||
|
unloaded_module_list.AppendIfNeeded(unload_image_module_sp);
|
||
|
} else {
|
||
|
if (log) {
|
||
|
LLDB_LOGF(log, "Could not find module for unloading info entry:");
|
||
|
image_infos[idx].PutToLog(log);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Then remove it from the m_dyld_image_infos:
|
||
|
|
||
|
m_dyld_image_infos.erase(pos);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (pos == end) {
|
||
|
if (log) {
|
||
|
LLDB_LOGF(log, "Could not find image_info entry for unloading image:");
|
||
|
image_infos[idx].PutToLog(log);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
if (unloaded_module_list.GetSize() > 0) {
|
||
|
if (log) {
|
||
|
log->PutCString("Unloaded:");
|
||
|
unloaded_module_list.LogUUIDAndPaths(
|
||
|
log, "DynamicLoaderMacOSXDYLD::ModulesDidUnload");
|
||
|
}
|
||
|
m_process->GetTarget().GetImages().Remove(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,
|
||
|
ImageInfo::collection &image_infos) {
|
||
|
std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
|
||
|
const ByteOrder endian = GetByteOrderFromMagic(m_dyld.header.magic);
|
||
|
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);
|
||
|
Status error;
|
||
|
const size_t bytes_read = m_process->ReadMemory(
|
||
|
image_infos_addr, info_data.GetBytes(), info_data.GetByteSize(), error);
|
||
|
if (bytes_read == count) {
|
||
|
lldb::offset_t info_data_offset = 0;
|
||
|
DataExtractor info_data_ref(info_data.GetBytes(), info_data.GetByteSize(),
|
||
|
endian, addr_size);
|
||
|
for (size_t i = 0;
|
||
|
i < image_infos.size() && info_data_ref.ValidOffset(info_data_offset);
|
||
|
i++) {
|
||
|
image_infos[i].address = info_data_ref.GetAddress(&info_data_offset);
|
||
|
lldb::addr_t path_addr = info_data_ref.GetAddress(&info_data_offset);
|
||
|
image_infos[i].mod_date = info_data_ref.GetAddress(&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()) {
|
||
|
image_infos[i].file_spec.SetFile(raw_path, FileSpec::Style::native);
|
||
|
}
|
||
|
}
|
||
|
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() {
|
||
|
Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
||
|
|
||
|
std::lock_guard<std::recursive_mutex> guard(m_mutex);
|
||
|
std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
|
||
|
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("%s", "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();
|
||
|
const ModuleList &target_modules = target.GetImages();
|
||
|
ModuleList not_loaded_modules;
|
||
|
std::lock_guard<std::recursive_mutex> guard(target_modules.GetMutex());
|
||
|
|
||
|
size_t num_modules = target_modules.GetSize();
|
||
|
for (size_t i = 0; i < num_modules; i++) {
|
||
|
ModuleSP module_sp = target_modules.GetModuleAtIndexUnlocked(i);
|
||
|
if (!module_sp->IsLoadedInTarget(&target)) {
|
||
|
if (log) {
|
||
|
StreamString s;
|
||
|
module_sp->GetDescription(s.AsRawOstream());
|
||
|
LLDB_LOGF(log, "Unloading pre-run module: %s.", s.GetData());
|
||
|
}
|
||
|
not_loaded_modules.Append(module_sp);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (not_loaded_modules.GetSize() != 0) {
|
||
|
target.GetImages().Remove(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);
|
||
|
Status error;
|
||
|
size_t bytes_read = m_process->ReadMemory(addr, header_bytes.GetBytes(),
|
||
|
header_bytes.GetByteSize(), error);
|
||
|
if (bytes_read == sizeof(llvm::MachO::mach_header)) {
|
||
|
lldb::offset_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(),
|
||
|
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::MH_MAGIC:
|
||
|
case llvm::MachO::MH_CIGAM:
|
||
|
data.SetAddressByteSize(4);
|
||
|
load_cmd_addr += sizeof(llvm::MachO::mach_header);
|
||
|
break;
|
||
|
|
||
|
case llvm::MachO::MH_MAGIC_64:
|
||
|
case llvm::MachO::MH_CIGAM_64:
|
||
|
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 == nullptr)
|
||
|
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,
|
||
|
ImageInfo &dylib_info,
|
||
|
FileSpec *lc_id_dylinker) {
|
||
|
lldb::offset_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;
|
||
|
lldb::offset_t load_cmd_offset = offset;
|
||
|
load_cmd.cmd = data.GetU32(&offset);
|
||
|
load_cmd.cmdsize = data.GetU32(&offset);
|
||
|
switch (load_cmd.cmd) {
|
||
|
case llvm::MachO::LC_SEGMENT: {
|
||
|
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::LC_SEGMENT_64: {
|
||
|
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::LC_ID_DYLINKER:
|
||
|
if (lc_id_dylinker) {
|
||
|
const lldb::offset_t name_offset =
|
||
|
load_cmd_offset + data.GetU32(&offset);
|
||
|
const char *path = data.PeekCStr(name_offset);
|
||
|
lc_id_dylinker->SetFile(path, FileSpec::Style::native);
|
||
|
FileSystem::Instance().Resolve(*lc_id_dylinker);
|
||
|
}
|
||
|
break;
|
||
|
|
||
|
case llvm::MachO::LC_UUID:
|
||
|
dylib_info.uuid = UUID::fromOptionalData(data.GetData(&offset, 16), 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.segments[i].name == "__TEXT")) {
|
||
|
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(
|
||
|
ImageInfo::collection &image_infos, uint32_t infos_count,
|
||
|
bool update_executable) {
|
||
|
uint32_t exe_idx = UINT32_MAX;
|
||
|
// 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], nullptr);
|
||
|
|
||
|
if (image_infos[i].header.filetype == llvm::MachO::MH_EXECUTE)
|
||
|
exe_idx = i;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
Target &target = m_process->GetTarget();
|
||
|
|
||
|
if (exe_idx < image_infos.size()) {
|
||
|
const bool can_create = true;
|
||
|
ModuleSP exe_module_sp(FindTargetModuleForImageInfo(image_infos[exe_idx],
|
||
|
can_create, nullptr));
|
||
|
|
||
|
if (exe_module_sp) {
|
||
|
UpdateImageLoadAddress(exe_module_sp.get(), image_infos[exe_idx]);
|
||
|
|
||
|
if (exe_module_sp.get() != target.GetExecutableModulePointer()) {
|
||
|
// Don't load dependent images since we are in dyld where we will know
|
||
|
// and find out about all images that are loaded. Also when setting the
|
||
|
// executable module, it will clear the targets module list, and if we
|
||
|
// have an in memory dyld module, it will get removed from the list so
|
||
|
// we will need to add it back after setting the executable module, so
|
||
|
// we first try and see if we already have a weak pointer to the dyld
|
||
|
// module, make it into a shared pointer, then add the executable, then
|
||
|
// re-add it back to make sure it is always in the list.
|
||
|
ModuleSP dyld_module_sp(GetDYLDModule());
|
||
|
|
||
|
m_process->GetTarget().SetExecutableModule(exe_module_sp,
|
||
|
eLoadDependentsNo);
|
||
|
|
||
|
if (dyld_module_sp) {
|
||
|
if (target.GetImages().AppendIfNeeded(dyld_module_sp)) {
|
||
|
std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
|
||
|
|
||
|
// Also add it to the section list.
|
||
|
UpdateImageLoadAddress(dyld_module_sp.get(), m_dyld);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// 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 == nullptr)
|
||
|
return;
|
||
|
|
||
|
std::lock_guard<std::recursive_mutex> guard(m_mutex);
|
||
|
std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
|
||
|
LLDB_LOGF(log,
|
||
|
"dyld_all_image_infos = { version=%d, count=%d, addr=0x%8.8" PRIx64
|
||
|
", notify=0x%8.8" PRIx64 " }",
|
||
|
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);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
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.
|
||
|
bool resolved = m_process->GetTarget().ResolveLoadAddress(
|
||
|
m_dyld_all_image_infos.notification, so_addr);
|
||
|
if (!resolved) {
|
||
|
ModuleSP dyld_module_sp = GetDYLDModule();
|
||
|
if (dyld_module_sp) {
|
||
|
std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
|
||
|
|
||
|
UpdateImageLoadAddress(dyld_module_sp.get(), m_dyld);
|
||
|
resolved = m_process->GetTarget().ResolveLoadAddress(
|
||
|
m_dyld_all_image_infos.notification, so_addr);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (resolved) {
|
||
|
Breakpoint *dyld_break =
|
||
|
m_process->GetTarget().CreateBreakpoint(so_addr, true, false).get();
|
||
|
dyld_break->SetCallback(DynamicLoaderMacOSXDYLD::NotifyBreakpointHit,
|
||
|
this, true);
|
||
|
dyld_break->SetBreakpointKind("shared-library-event");
|
||
|
m_break_id = dyld_break->GetID();
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return m_break_id != LLDB_INVALID_BREAK_ID;
|
||
|
}
|
||
|
|
||
|
Status DynamicLoaderMacOSXDYLD::CanLoadImage() {
|
||
|
Status 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;
|
||
|
}
|
||
|
|
||
|
bool DynamicLoaderMacOSXDYLD::GetSharedCacheInformation(
|
||
|
lldb::addr_t &base_address, UUID &uuid, LazyBool &using_shared_cache,
|
||
|
LazyBool &private_shared_cache) {
|
||
|
base_address = LLDB_INVALID_ADDRESS;
|
||
|
uuid.Clear();
|
||
|
using_shared_cache = eLazyBoolCalculate;
|
||
|
private_shared_cache = eLazyBoolCalculate;
|
||
|
|
||
|
if (m_process) {
|
||
|
addr_t all_image_infos = m_process->GetImageInfoAddress();
|
||
|
|
||
|
// The address returned by GetImageInfoAddress may be the address of dyld
|
||
|
// (don't want) or it may be the address of the dyld_all_image_infos
|
||
|
// structure (want). The first four bytes will be either the version field
|
||
|
// (all_image_infos) or a Mach-O file magic constant. Version 13 and higher
|
||
|
// of dyld_all_image_infos is required to get the sharedCacheUUID field.
|
||
|
|
||
|
Status err;
|
||
|
uint32_t version_or_magic =
|
||
|
m_process->ReadUnsignedIntegerFromMemory(all_image_infos, 4, -1, err);
|
||
|
if (version_or_magic != static_cast<uint32_t>(-1) &&
|
||
|
version_or_magic != llvm::MachO::MH_MAGIC &&
|
||
|
version_or_magic != llvm::MachO::MH_CIGAM &&
|
||
|
version_or_magic != llvm::MachO::MH_MAGIC_64 &&
|
||
|
version_or_magic != llvm::MachO::MH_CIGAM_64 &&
|
||
|
version_or_magic >= 13) {
|
||
|
addr_t sharedCacheUUID_address = LLDB_INVALID_ADDRESS;
|
||
|
int wordsize = m_process->GetAddressByteSize();
|
||
|
if (wordsize == 8) {
|
||
|
sharedCacheUUID_address =
|
||
|
all_image_infos + 160; // sharedCacheUUID <mach-o/dyld_images.h>
|
||
|
}
|
||
|
if (wordsize == 4) {
|
||
|
sharedCacheUUID_address =
|
||
|
all_image_infos + 84; // sharedCacheUUID <mach-o/dyld_images.h>
|
||
|
}
|
||
|
if (sharedCacheUUID_address != LLDB_INVALID_ADDRESS) {
|
||
|
uuid_t shared_cache_uuid;
|
||
|
if (m_process->ReadMemory(sharedCacheUUID_address, shared_cache_uuid,
|
||
|
sizeof(uuid_t), err) == sizeof(uuid_t)) {
|
||
|
uuid = UUID::fromOptionalData(shared_cache_uuid, 16);
|
||
|
if (uuid.IsValid()) {
|
||
|
using_shared_cache = eLazyBoolYes;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (version_or_magic >= 15) {
|
||
|
// The sharedCacheBaseAddress field is the next one in the
|
||
|
// dyld_all_image_infos struct.
|
||
|
addr_t sharedCacheBaseAddr_address = sharedCacheUUID_address + 16;
|
||
|
Status error;
|
||
|
base_address = m_process->ReadUnsignedIntegerFromMemory(
|
||
|
sharedCacheBaseAddr_address, wordsize, LLDB_INVALID_ADDRESS,
|
||
|
error);
|
||
|
if (error.Fail())
|
||
|
base_address = LLDB_INVALID_ADDRESS;
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
//
|
||
|
// add
|
||
|
// NB: sharedCacheBaseAddress is the next field in dyld_all_image_infos
|
||
|
// after
|
||
|
// sharedCacheUUID -- that is, 16 bytes after it, if we wanted to fetch
|
||
|
// it.
|
||
|
}
|
||
|
}
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
void DynamicLoaderMacOSXDYLD::Initialize() {
|
||
|
PluginManager::RegisterPlugin(GetPluginNameStatic(),
|
||
|
GetPluginDescriptionStatic(), CreateInstance);
|
||
|
DynamicLoaderMacOS::Initialize();
|
||
|
}
|
||
|
|
||
|
void DynamicLoaderMacOSXDYLD::Terminate() {
|
||
|
DynamicLoaderMacOS::Terminate();
|
||
|
PluginManager::UnregisterPlugin(CreateInstance);
|
||
|
}
|
||
|
|
||
|
lldb_private::ConstString DynamicLoaderMacOSXDYLD::GetPluginNameStatic() {
|
||
|
static ConstString g_name("macosx-dyld");
|
||
|
return g_name;
|
||
|
}
|
||
|
|
||
|
const char *DynamicLoaderMacOSXDYLD::GetPluginDescriptionStatic() {
|
||
|
return "Dynamic loader plug-in that watches for shared library loads/unloads "
|
||
|
"in MacOSX user processes.";
|
||
|
}
|
||
|
|
||
|
// PluginInterface protocol
|
||
|
lldb_private::ConstString DynamicLoaderMacOSXDYLD::GetPluginName() {
|
||
|
return GetPluginNameStatic();
|
||
|
}
|
||
|
|
||
|
uint32_t DynamicLoaderMacOSXDYLD::GetPluginVersion() { return 1; }
|
||
|
|
||
|
uint32_t DynamicLoaderMacOSXDYLD::AddrByteSize() {
|
||
|
std::lock_guard<std::recursive_mutex> baseclass_guard(GetMutex());
|
||
|
|
||
|
switch (m_dyld.header.magic) {
|
||
|
case llvm::MachO::MH_MAGIC:
|
||
|
case llvm::MachO::MH_CIGAM:
|
||
|
return 4;
|
||
|
|
||
|
case llvm::MachO::MH_MAGIC_64:
|
||
|
case llvm::MachO::MH_CIGAM_64:
|
||
|
return 8;
|
||
|
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
lldb::ByteOrder DynamicLoaderMacOSXDYLD::GetByteOrderFromMagic(uint32_t magic) {
|
||
|
switch (magic) {
|
||
|
case llvm::MachO::MH_MAGIC:
|
||
|
case llvm::MachO::MH_MAGIC_64:
|
||
|
return endian::InlHostByteOrder();
|
||
|
|
||
|
case llvm::MachO::MH_CIGAM:
|
||
|
case llvm::MachO::MH_CIGAM_64:
|
||
|
if (endian::InlHostByteOrder() == lldb::eByteOrderBig)
|
||
|
return lldb::eByteOrderLittle;
|
||
|
else
|
||
|
return lldb::eByteOrderBig;
|
||
|
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
return lldb::eByteOrderInvalid;
|
||
|
}
|