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769 lines
26 KiB
769 lines
26 KiB
//===-- DynamicLoaderPOSIXDYLD.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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// Main header include
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#include "DynamicLoaderPOSIXDYLD.h"
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#include "lldb/Breakpoint/BreakpointLocation.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/MemoryRegionInfo.h"
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#include "lldb/Target/Platform.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/Log.h"
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#include "lldb/Utility/ProcessInfo.h"
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#include <memory>
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using namespace lldb;
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using namespace lldb_private;
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LLDB_PLUGIN_DEFINE_ADV(DynamicLoaderPOSIXDYLD, DynamicLoaderPosixDYLD)
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void DynamicLoaderPOSIXDYLD::Initialize() {
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PluginManager::RegisterPlugin(GetPluginNameStatic(),
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GetPluginDescriptionStatic(), CreateInstance);
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}
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void DynamicLoaderPOSIXDYLD::Terminate() {}
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lldb_private::ConstString DynamicLoaderPOSIXDYLD::GetPluginName() {
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return GetPluginNameStatic();
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}
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lldb_private::ConstString DynamicLoaderPOSIXDYLD::GetPluginNameStatic() {
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static ConstString g_name("linux-dyld");
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return g_name;
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}
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const char *DynamicLoaderPOSIXDYLD::GetPluginDescriptionStatic() {
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return "Dynamic loader plug-in that watches for shared library "
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"loads/unloads in POSIX processes.";
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}
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uint32_t DynamicLoaderPOSIXDYLD::GetPluginVersion() { return 1; }
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DynamicLoader *DynamicLoaderPOSIXDYLD::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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const llvm::Triple &triple_ref =
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process->GetTarget().GetArchitecture().GetTriple();
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if (triple_ref.getOS() == llvm::Triple::FreeBSD ||
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triple_ref.getOS() == llvm::Triple::Linux ||
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triple_ref.getOS() == llvm::Triple::NetBSD)
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create = true;
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}
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if (create)
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return new DynamicLoaderPOSIXDYLD(process);
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return nullptr;
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}
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DynamicLoaderPOSIXDYLD::DynamicLoaderPOSIXDYLD(Process *process)
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: DynamicLoader(process), m_rendezvous(process),
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m_load_offset(LLDB_INVALID_ADDRESS), m_entry_point(LLDB_INVALID_ADDRESS),
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m_auxv(), m_dyld_bid(LLDB_INVALID_BREAK_ID),
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m_vdso_base(LLDB_INVALID_ADDRESS),
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m_interpreter_base(LLDB_INVALID_ADDRESS) {}
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DynamicLoaderPOSIXDYLD::~DynamicLoaderPOSIXDYLD() {
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if (m_dyld_bid != LLDB_INVALID_BREAK_ID) {
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m_process->GetTarget().RemoveBreakpointByID(m_dyld_bid);
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m_dyld_bid = LLDB_INVALID_BREAK_ID;
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}
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}
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void DynamicLoaderPOSIXDYLD::DidAttach() {
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Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
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LLDB_LOGF(log, "DynamicLoaderPOSIXDYLD::%s() pid %" PRIu64, __FUNCTION__,
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID);
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m_auxv = std::make_unique<AuxVector>(m_process->GetAuxvData());
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LLDB_LOGF(
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log, "DynamicLoaderPOSIXDYLD::%s pid %" PRIu64 " reloaded auxv data",
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__FUNCTION__, m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID);
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// ask the process if it can load any of its own modules
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auto error = m_process->LoadModules();
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LLDB_LOG_ERROR(log, std::move(error), "Couldn't load modules: {0}");
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ModuleSP executable_sp = GetTargetExecutable();
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ResolveExecutableModule(executable_sp);
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// find the main process load offset
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addr_t load_offset = ComputeLoadOffset();
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LLDB_LOGF(log,
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"DynamicLoaderPOSIXDYLD::%s pid %" PRIu64
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" executable '%s', load_offset 0x%" PRIx64,
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__FUNCTION__,
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID,
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executable_sp ? executable_sp->GetFileSpec().GetPath().c_str()
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: "<null executable>",
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load_offset);
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EvalSpecialModulesStatus();
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// if we dont have a load address we cant re-base
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bool rebase_exec = load_offset != LLDB_INVALID_ADDRESS;
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// if we have a valid executable
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if (executable_sp.get()) {
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lldb_private::ObjectFile *obj = executable_sp->GetObjectFile();
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if (obj) {
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// don't rebase if the module already has a load address
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Target &target = m_process->GetTarget();
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Address addr = obj->GetImageInfoAddress(&target);
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if (addr.GetLoadAddress(&target) != LLDB_INVALID_ADDRESS)
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rebase_exec = false;
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}
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} else {
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// no executable, nothing to re-base
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rebase_exec = false;
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}
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// if the target executable should be re-based
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if (rebase_exec) {
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ModuleList module_list;
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module_list.Append(executable_sp);
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LLDB_LOGF(log,
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"DynamicLoaderPOSIXDYLD::%s pid %" PRIu64
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" added executable '%s' to module load list",
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__FUNCTION__,
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID,
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executable_sp->GetFileSpec().GetPath().c_str());
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UpdateLoadedSections(executable_sp, LLDB_INVALID_ADDRESS, load_offset,
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true);
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LoadAllCurrentModules();
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m_process->GetTarget().ModulesDidLoad(module_list);
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if (log) {
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LLDB_LOGF(log,
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"DynamicLoaderPOSIXDYLD::%s told the target about the "
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"modules that loaded:",
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__FUNCTION__);
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for (auto module_sp : module_list.Modules()) {
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LLDB_LOGF(log, "-- [module] %s (pid %" PRIu64 ")",
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module_sp ? module_sp->GetFileSpec().GetPath().c_str()
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: "<null>",
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID);
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}
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}
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}
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if (executable_sp.get()) {
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if (!SetRendezvousBreakpoint()) {
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// If we cannot establish rendezvous breakpoint right now we'll try again
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// at entry point.
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ProbeEntry();
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}
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}
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}
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void DynamicLoaderPOSIXDYLD::DidLaunch() {
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Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
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LLDB_LOGF(log, "DynamicLoaderPOSIXDYLD::%s()", __FUNCTION__);
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ModuleSP executable;
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addr_t load_offset;
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m_auxv = std::make_unique<AuxVector>(m_process->GetAuxvData());
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executable = GetTargetExecutable();
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load_offset = ComputeLoadOffset();
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EvalSpecialModulesStatus();
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if (executable.get() && load_offset != LLDB_INVALID_ADDRESS) {
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ModuleList module_list;
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module_list.Append(executable);
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UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, load_offset, true);
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LLDB_LOGF(log, "DynamicLoaderPOSIXDYLD::%s about to call ProbeEntry()",
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__FUNCTION__);
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if (!SetRendezvousBreakpoint()) {
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// If we cannot establish rendezvous breakpoint right now we'll try again
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// at entry point.
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ProbeEntry();
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}
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LoadVDSO();
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m_process->GetTarget().ModulesDidLoad(module_list);
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}
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}
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Status DynamicLoaderPOSIXDYLD::CanLoadImage() { return Status(); }
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void DynamicLoaderPOSIXDYLD::UpdateLoadedSections(ModuleSP module,
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addr_t link_map_addr,
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addr_t base_addr,
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bool base_addr_is_offset) {
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m_loaded_modules[module] = link_map_addr;
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UpdateLoadedSectionsCommon(module, base_addr, base_addr_is_offset);
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}
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void DynamicLoaderPOSIXDYLD::UnloadSections(const ModuleSP module) {
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m_loaded_modules.erase(module);
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UnloadSectionsCommon(module);
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}
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void DynamicLoaderPOSIXDYLD::ProbeEntry() {
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Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
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const addr_t entry = GetEntryPoint();
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if (entry == LLDB_INVALID_ADDRESS) {
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LLDB_LOGF(
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log,
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"DynamicLoaderPOSIXDYLD::%s pid %" PRIu64
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" GetEntryPoint() returned no address, not setting entry breakpoint",
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__FUNCTION__, m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID);
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return;
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}
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LLDB_LOGF(log,
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"DynamicLoaderPOSIXDYLD::%s pid %" PRIu64
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" GetEntryPoint() returned address 0x%" PRIx64
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", setting entry breakpoint",
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__FUNCTION__,
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID, entry);
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if (m_process) {
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Breakpoint *const entry_break =
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m_process->GetTarget().CreateBreakpoint(entry, true, false).get();
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entry_break->SetCallback(EntryBreakpointHit, this, true);
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entry_break->SetBreakpointKind("shared-library-event");
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// Shoudn't hit this more than once.
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entry_break->SetOneShot(true);
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}
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}
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// The runtime linker has run and initialized the rendezvous structure once the
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// process has hit its entry point. When we hit the corresponding breakpoint
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// we interrogate the rendezvous structure to get the load addresses of all
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// dependent modules for the process. Similarly, we can discover the runtime
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// linker function and setup a breakpoint to notify us of any dynamically
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// loaded modules (via dlopen).
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bool DynamicLoaderPOSIXDYLD::EntryBreakpointHit(
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void *baton, StoppointCallbackContext *context, user_id_t break_id,
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user_id_t break_loc_id) {
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assert(baton && "null baton");
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if (!baton)
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return false;
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Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
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DynamicLoaderPOSIXDYLD *const dyld_instance =
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static_cast<DynamicLoaderPOSIXDYLD *>(baton);
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LLDB_LOGF(log, "DynamicLoaderPOSIXDYLD::%s called for pid %" PRIu64,
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__FUNCTION__,
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dyld_instance->m_process ? dyld_instance->m_process->GetID()
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: LLDB_INVALID_PROCESS_ID);
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// Disable the breakpoint --- if a stop happens right after this, which we've
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// seen on occasion, we don't want the breakpoint stepping thread-plan logic
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// to show a breakpoint instruction at the disassembled entry point to the
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// program. Disabling it prevents it. (One-shot is not enough - one-shot
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// removal logic only happens after the breakpoint goes public, which wasn't
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// happening in our scenario).
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if (dyld_instance->m_process) {
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BreakpointSP breakpoint_sp =
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dyld_instance->m_process->GetTarget().GetBreakpointByID(break_id);
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if (breakpoint_sp) {
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LLDB_LOGF(log,
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"DynamicLoaderPOSIXDYLD::%s pid %" PRIu64
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" disabling breakpoint id %" PRIu64,
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__FUNCTION__, dyld_instance->m_process->GetID(), break_id);
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breakpoint_sp->SetEnabled(false);
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} else {
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LLDB_LOGF(log,
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"DynamicLoaderPOSIXDYLD::%s pid %" PRIu64
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" failed to find breakpoint for breakpoint id %" PRIu64,
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__FUNCTION__, dyld_instance->m_process->GetID(), break_id);
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}
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} else {
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LLDB_LOGF(log,
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"DynamicLoaderPOSIXDYLD::%s breakpoint id %" PRIu64
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" no Process instance! Cannot disable breakpoint",
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__FUNCTION__, break_id);
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}
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dyld_instance->LoadAllCurrentModules();
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dyld_instance->SetRendezvousBreakpoint();
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return false; // Continue running.
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}
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bool DynamicLoaderPOSIXDYLD::SetRendezvousBreakpoint() {
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Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
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if (m_dyld_bid != LLDB_INVALID_BREAK_ID) {
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LLDB_LOG(log,
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"Rendezvous breakpoint breakpoint id {0} for pid {1}"
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"is already set.",
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m_dyld_bid,
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID);
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return true;
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}
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addr_t break_addr;
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Target &target = m_process->GetTarget();
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BreakpointSP dyld_break;
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if (m_rendezvous.IsValid()) {
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break_addr = m_rendezvous.GetBreakAddress();
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LLDB_LOG(log, "Setting rendezvous break address for pid {0} at {1:x}",
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID,
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break_addr);
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dyld_break = target.CreateBreakpoint(break_addr, true, false);
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} else {
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LLDB_LOG(log, "Rendezvous structure is not set up yet. "
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"Trying to locate rendezvous breakpoint in the interpreter "
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"by symbol name.");
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ModuleSP interpreter = LoadInterpreterModule();
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if (!interpreter) {
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LLDB_LOG(log, "Can't find interpreter, rendezvous breakpoint isn't set.");
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return false;
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}
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// Function names from different dynamic loaders that are known to be used
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// as rendezvous between the loader and debuggers.
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static std::vector<std::string> DebugStateCandidates{
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"_dl_debug_state", "rtld_db_dlactivity", "__dl_rtld_db_dlactivity",
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"r_debug_state", "_r_debug_state", "_rtld_debug_state",
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};
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FileSpecList containingModules;
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containingModules.Append(interpreter->GetFileSpec());
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dyld_break = target.CreateBreakpoint(
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&containingModules, nullptr /* containingSourceFiles */,
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DebugStateCandidates, eFunctionNameTypeFull, eLanguageTypeC,
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0, /* offset */
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eLazyBoolNo, /* skip_prologue */
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true, /* internal */
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false /* request_hardware */);
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}
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if (dyld_break->GetNumResolvedLocations() != 1) {
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LLDB_LOG(
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log,
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"Rendezvous breakpoint has abnormal number of"
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" resolved locations ({0}) in pid {1}. It's supposed to be exactly 1.",
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dyld_break->GetNumResolvedLocations(),
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID);
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target.RemoveBreakpointByID(dyld_break->GetID());
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return false;
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}
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BreakpointLocationSP location = dyld_break->GetLocationAtIndex(0);
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LLDB_LOG(log,
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"Successfully set rendezvous breakpoint at address {0:x} "
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"for pid {1}",
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location->GetLoadAddress(),
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m_process ? m_process->GetID() : LLDB_INVALID_PROCESS_ID);
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dyld_break->SetCallback(RendezvousBreakpointHit, this, true);
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dyld_break->SetBreakpointKind("shared-library-event");
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m_dyld_bid = dyld_break->GetID();
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return true;
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}
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bool DynamicLoaderPOSIXDYLD::RendezvousBreakpointHit(
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void *baton, StoppointCallbackContext *context, user_id_t break_id,
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user_id_t break_loc_id) {
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assert(baton && "null baton");
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if (!baton)
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return false;
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Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
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DynamicLoaderPOSIXDYLD *const dyld_instance =
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static_cast<DynamicLoaderPOSIXDYLD *>(baton);
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LLDB_LOGF(log, "DynamicLoaderPOSIXDYLD::%s called for pid %" PRIu64,
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__FUNCTION__,
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dyld_instance->m_process ? dyld_instance->m_process->GetID()
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: LLDB_INVALID_PROCESS_ID);
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dyld_instance->RefreshModules();
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// Return true to stop the target, false to just let the target run.
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const bool stop_when_images_change = dyld_instance->GetStopWhenImagesChange();
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LLDB_LOGF(log,
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"DynamicLoaderPOSIXDYLD::%s pid %" PRIu64
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" stop_when_images_change=%s",
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__FUNCTION__,
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dyld_instance->m_process ? dyld_instance->m_process->GetID()
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: LLDB_INVALID_PROCESS_ID,
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stop_when_images_change ? "true" : "false");
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return stop_when_images_change;
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}
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void DynamicLoaderPOSIXDYLD::RefreshModules() {
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if (!m_rendezvous.Resolve())
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return;
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DYLDRendezvous::iterator I;
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DYLDRendezvous::iterator E;
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ModuleList &loaded_modules = m_process->GetTarget().GetImages();
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if (m_rendezvous.ModulesDidLoad()) {
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ModuleList new_modules;
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E = m_rendezvous.loaded_end();
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for (I = m_rendezvous.loaded_begin(); I != E; ++I) {
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ModuleSP module_sp =
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LoadModuleAtAddress(I->file_spec, I->link_addr, I->base_addr, true);
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if (module_sp.get()) {
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loaded_modules.AppendIfNeeded(module_sp);
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new_modules.Append(module_sp);
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}
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}
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m_process->GetTarget().ModulesDidLoad(new_modules);
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}
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if (m_rendezvous.ModulesDidUnload()) {
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ModuleList old_modules;
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E = m_rendezvous.unloaded_end();
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for (I = m_rendezvous.unloaded_begin(); I != E; ++I) {
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ModuleSpec module_spec{I->file_spec};
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ModuleSP module_sp = loaded_modules.FindFirstModule(module_spec);
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if (module_sp.get()) {
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old_modules.Append(module_sp);
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UnloadSections(module_sp);
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}
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}
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loaded_modules.Remove(old_modules);
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m_process->GetTarget().ModulesDidUnload(old_modules, false);
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}
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}
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ThreadPlanSP
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DynamicLoaderPOSIXDYLD::GetStepThroughTrampolinePlan(Thread &thread,
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bool stop) {
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ThreadPlanSP thread_plan_sp;
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StackFrame *frame = thread.GetStackFrameAtIndex(0).get();
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const SymbolContext &context = frame->GetSymbolContext(eSymbolContextSymbol);
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Symbol *sym = context.symbol;
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if (sym == nullptr || !sym->IsTrampoline())
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return thread_plan_sp;
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ConstString sym_name = sym->GetName();
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if (!sym_name)
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return thread_plan_sp;
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SymbolContextList target_symbols;
|
|
Target &target = thread.GetProcess()->GetTarget();
|
|
const ModuleList &images = target.GetImages();
|
|
|
|
images.FindSymbolsWithNameAndType(sym_name, eSymbolTypeCode, target_symbols);
|
|
size_t num_targets = target_symbols.GetSize();
|
|
if (!num_targets)
|
|
return thread_plan_sp;
|
|
|
|
typedef std::vector<lldb::addr_t> AddressVector;
|
|
AddressVector addrs;
|
|
for (size_t i = 0; i < num_targets; ++i) {
|
|
SymbolContext context;
|
|
AddressRange range;
|
|
if (target_symbols.GetContextAtIndex(i, context)) {
|
|
context.GetAddressRange(eSymbolContextEverything, 0, false, range);
|
|
lldb::addr_t addr = range.GetBaseAddress().GetLoadAddress(&target);
|
|
if (addr != LLDB_INVALID_ADDRESS)
|
|
addrs.push_back(addr);
|
|
}
|
|
}
|
|
|
|
if (addrs.size() > 0) {
|
|
AddressVector::iterator start = addrs.begin();
|
|
AddressVector::iterator end = addrs.end();
|
|
|
|
llvm::sort(start, end);
|
|
addrs.erase(std::unique(start, end), end);
|
|
thread_plan_sp =
|
|
std::make_shared<ThreadPlanRunToAddress>(thread, addrs, stop);
|
|
}
|
|
|
|
return thread_plan_sp;
|
|
}
|
|
|
|
void DynamicLoaderPOSIXDYLD::LoadVDSO() {
|
|
if (m_vdso_base == LLDB_INVALID_ADDRESS)
|
|
return;
|
|
|
|
FileSpec file("[vdso]");
|
|
|
|
MemoryRegionInfo info;
|
|
Status status = m_process->GetMemoryRegionInfo(m_vdso_base, info);
|
|
if (status.Fail()) {
|
|
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
|
LLDB_LOG(log, "Failed to get vdso region info: {0}", status);
|
|
return;
|
|
}
|
|
|
|
if (ModuleSP module_sp = m_process->ReadModuleFromMemory(
|
|
file, m_vdso_base, info.GetRange().GetByteSize())) {
|
|
UpdateLoadedSections(module_sp, LLDB_INVALID_ADDRESS, m_vdso_base, false);
|
|
m_process->GetTarget().GetImages().AppendIfNeeded(module_sp);
|
|
}
|
|
}
|
|
|
|
ModuleSP DynamicLoaderPOSIXDYLD::LoadInterpreterModule() {
|
|
if (m_interpreter_base == LLDB_INVALID_ADDRESS)
|
|
return nullptr;
|
|
|
|
MemoryRegionInfo info;
|
|
Target &target = m_process->GetTarget();
|
|
Status status = m_process->GetMemoryRegionInfo(m_interpreter_base, info);
|
|
if (status.Fail() || info.GetMapped() != MemoryRegionInfo::eYes ||
|
|
info.GetName().IsEmpty()) {
|
|
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
|
LLDB_LOG(log, "Failed to get interpreter region info: {0}", status);
|
|
return nullptr;
|
|
}
|
|
|
|
FileSpec file(info.GetName().GetCString());
|
|
ModuleSpec module_spec(file, target.GetArchitecture());
|
|
|
|
if (ModuleSP module_sp = target.GetOrCreateModule(module_spec,
|
|
true /* notify */)) {
|
|
UpdateLoadedSections(module_sp, LLDB_INVALID_ADDRESS, m_interpreter_base,
|
|
false);
|
|
return module_sp;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
void DynamicLoaderPOSIXDYLD::LoadAllCurrentModules() {
|
|
DYLDRendezvous::iterator I;
|
|
DYLDRendezvous::iterator E;
|
|
ModuleList module_list;
|
|
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
|
|
|
LoadVDSO();
|
|
|
|
if (!m_rendezvous.Resolve()) {
|
|
LLDB_LOGF(log,
|
|
"DynamicLoaderPOSIXDYLD::%s unable to resolve POSIX DYLD "
|
|
"rendezvous address",
|
|
__FUNCTION__);
|
|
return;
|
|
}
|
|
|
|
// The rendezvous class doesn't enumerate the main module, so track that
|
|
// ourselves here.
|
|
ModuleSP executable = GetTargetExecutable();
|
|
m_loaded_modules[executable] = m_rendezvous.GetLinkMapAddress();
|
|
|
|
std::vector<FileSpec> module_names;
|
|
for (I = m_rendezvous.begin(), E = m_rendezvous.end(); I != E; ++I)
|
|
module_names.push_back(I->file_spec);
|
|
m_process->PrefetchModuleSpecs(
|
|
module_names, m_process->GetTarget().GetArchitecture().GetTriple());
|
|
|
|
for (I = m_rendezvous.begin(), E = m_rendezvous.end(); I != E; ++I) {
|
|
ModuleSP module_sp =
|
|
LoadModuleAtAddress(I->file_spec, I->link_addr, I->base_addr, true);
|
|
if (module_sp.get()) {
|
|
LLDB_LOG(log, "LoadAllCurrentModules loading module: {0}",
|
|
I->file_spec.GetFilename());
|
|
module_list.Append(module_sp);
|
|
} else {
|
|
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
|
LLDB_LOGF(
|
|
log,
|
|
"DynamicLoaderPOSIXDYLD::%s failed loading module %s at 0x%" PRIx64,
|
|
__FUNCTION__, I->file_spec.GetCString(), I->base_addr);
|
|
}
|
|
}
|
|
|
|
m_process->GetTarget().ModulesDidLoad(module_list);
|
|
}
|
|
|
|
addr_t DynamicLoaderPOSIXDYLD::ComputeLoadOffset() {
|
|
addr_t virt_entry;
|
|
|
|
if (m_load_offset != LLDB_INVALID_ADDRESS)
|
|
return m_load_offset;
|
|
|
|
if ((virt_entry = GetEntryPoint()) == LLDB_INVALID_ADDRESS)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
ModuleSP module = m_process->GetTarget().GetExecutableModule();
|
|
if (!module)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
ObjectFile *exe = module->GetObjectFile();
|
|
if (!exe)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
Address file_entry = exe->GetEntryPointAddress();
|
|
|
|
if (!file_entry.IsValid())
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
m_load_offset = virt_entry - file_entry.GetFileAddress();
|
|
return m_load_offset;
|
|
}
|
|
|
|
void DynamicLoaderPOSIXDYLD::EvalSpecialModulesStatus() {
|
|
if (llvm::Optional<uint64_t> vdso_base =
|
|
m_auxv->GetAuxValue(AuxVector::AUXV_AT_SYSINFO_EHDR))
|
|
m_vdso_base = *vdso_base;
|
|
|
|
if (llvm::Optional<uint64_t> interpreter_base =
|
|
m_auxv->GetAuxValue(AuxVector::AUXV_AT_BASE))
|
|
m_interpreter_base = *interpreter_base;
|
|
}
|
|
|
|
addr_t DynamicLoaderPOSIXDYLD::GetEntryPoint() {
|
|
if (m_entry_point != LLDB_INVALID_ADDRESS)
|
|
return m_entry_point;
|
|
|
|
if (m_auxv == nullptr)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
llvm::Optional<uint64_t> entry_point =
|
|
m_auxv->GetAuxValue(AuxVector::AUXV_AT_ENTRY);
|
|
if (!entry_point)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
m_entry_point = static_cast<addr_t>(*entry_point);
|
|
|
|
const ArchSpec &arch = m_process->GetTarget().GetArchitecture();
|
|
|
|
// On ppc64, the entry point is actually a descriptor. Dereference it.
|
|
if (arch.GetMachine() == llvm::Triple::ppc64)
|
|
m_entry_point = ReadUnsignedIntWithSizeInBytes(m_entry_point, 8);
|
|
|
|
return m_entry_point;
|
|
}
|
|
|
|
lldb::addr_t
|
|
DynamicLoaderPOSIXDYLD::GetThreadLocalData(const lldb::ModuleSP module_sp,
|
|
const lldb::ThreadSP thread,
|
|
lldb::addr_t tls_file_addr) {
|
|
auto it = m_loaded_modules.find(module_sp);
|
|
if (it == m_loaded_modules.end())
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
addr_t link_map = it->second;
|
|
if (link_map == LLDB_INVALID_ADDRESS)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
const DYLDRendezvous::ThreadInfo &metadata = m_rendezvous.GetThreadInfo();
|
|
if (!metadata.valid)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
// Get the thread pointer.
|
|
addr_t tp = thread->GetThreadPointer();
|
|
if (tp == LLDB_INVALID_ADDRESS)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
// Find the module's modid.
|
|
int modid_size = 4; // FIXME(spucci): This isn't right for big-endian 64-bit
|
|
int64_t modid = ReadUnsignedIntWithSizeInBytes(
|
|
link_map + metadata.modid_offset, modid_size);
|
|
if (modid == -1)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
// Lookup the DTV structure for this thread.
|
|
addr_t dtv_ptr = tp + metadata.dtv_offset;
|
|
addr_t dtv = ReadPointer(dtv_ptr);
|
|
if (dtv == LLDB_INVALID_ADDRESS)
|
|
return LLDB_INVALID_ADDRESS;
|
|
|
|
// Find the TLS block for this module.
|
|
addr_t dtv_slot = dtv + metadata.dtv_slot_size * modid;
|
|
addr_t tls_block = ReadPointer(dtv_slot + metadata.tls_offset);
|
|
|
|
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
|
LLDB_LOGF(log,
|
|
"DynamicLoaderPOSIXDYLD::Performed TLS lookup: "
|
|
"module=%s, link_map=0x%" PRIx64 ", tp=0x%" PRIx64
|
|
", modid=%" PRId64 ", tls_block=0x%" PRIx64 "\n",
|
|
module_sp->GetObjectName().AsCString(""), link_map, tp,
|
|
(int64_t)modid, tls_block);
|
|
|
|
if (tls_block == LLDB_INVALID_ADDRESS)
|
|
return LLDB_INVALID_ADDRESS;
|
|
else
|
|
return tls_block + tls_file_addr;
|
|
}
|
|
|
|
void DynamicLoaderPOSIXDYLD::ResolveExecutableModule(
|
|
lldb::ModuleSP &module_sp) {
|
|
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
|
|
|
|
if (m_process == nullptr)
|
|
return;
|
|
|
|
auto &target = m_process->GetTarget();
|
|
const auto platform_sp = target.GetPlatform();
|
|
|
|
ProcessInstanceInfo process_info;
|
|
if (!m_process->GetProcessInfo(process_info)) {
|
|
LLDB_LOGF(log,
|
|
"DynamicLoaderPOSIXDYLD::%s - failed to get process info for "
|
|
"pid %" PRIu64,
|
|
__FUNCTION__, m_process->GetID());
|
|
return;
|
|
}
|
|
|
|
LLDB_LOGF(
|
|
log, "DynamicLoaderPOSIXDYLD::%s - got executable by pid %" PRIu64 ": %s",
|
|
__FUNCTION__, m_process->GetID(),
|
|
process_info.GetExecutableFile().GetPath().c_str());
|
|
|
|
ModuleSpec module_spec(process_info.GetExecutableFile(),
|
|
process_info.GetArchitecture());
|
|
if (module_sp && module_sp->MatchesModuleSpec(module_spec))
|
|
return;
|
|
|
|
const auto executable_search_paths(Target::GetDefaultExecutableSearchPaths());
|
|
auto error = platform_sp->ResolveExecutable(
|
|
module_spec, module_sp,
|
|
!executable_search_paths.IsEmpty() ? &executable_search_paths : nullptr);
|
|
if (error.Fail()) {
|
|
StreamString stream;
|
|
module_spec.Dump(stream);
|
|
|
|
LLDB_LOGF(log,
|
|
"DynamicLoaderPOSIXDYLD::%s - failed to resolve executable "
|
|
"with module spec \"%s\": %s",
|
|
__FUNCTION__, stream.GetData(), error.AsCString());
|
|
return;
|
|
}
|
|
|
|
target.SetExecutableModule(module_sp, eLoadDependentsNo);
|
|
}
|
|
|
|
bool DynamicLoaderPOSIXDYLD::AlwaysRelyOnEHUnwindInfo(
|
|
lldb_private::SymbolContext &sym_ctx) {
|
|
ModuleSP module_sp;
|
|
if (sym_ctx.symbol)
|
|
module_sp = sym_ctx.symbol->GetAddressRef().GetModule();
|
|
if (!module_sp && sym_ctx.function)
|
|
module_sp =
|
|
sym_ctx.function->GetAddressRange().GetBaseAddress().GetModule();
|
|
if (!module_sp)
|
|
return false;
|
|
|
|
return module_sp->GetFileSpec().GetPath() == "[vdso]";
|
|
}
|