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//===-- DynamicLoaderPOSIXDYLD.h --------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_SOURCE_PLUGINS_DYNAMICLOADER_POSIX_DYLD_DYNAMICLOADERPOSIXDYLD_H
#define LLDB_SOURCE_PLUGINS_DYNAMICLOADER_POSIX_DYLD_DYNAMICLOADERPOSIXDYLD_H
#include <map>
#include <memory>
#include "DYLDRendezvous.h"
#include "Plugins/Process/Utility/AuxVector.h"
#include "lldb/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Core/ModuleList.h"
#include "lldb/Target/DynamicLoader.h"
class AuxVector;
class DynamicLoaderPOSIXDYLD : public lldb_private::DynamicLoader {
public:
DynamicLoaderPOSIXDYLD(lldb_private::Process *process);
~DynamicLoaderPOSIXDYLD() override;
static void Initialize();
static void Terminate();
static lldb_private::ConstString GetPluginNameStatic();
static const char *GetPluginDescriptionStatic();
static lldb_private::DynamicLoader *
CreateInstance(lldb_private::Process *process, bool force);
// DynamicLoader protocol
void DidAttach() override;
void DidLaunch() override;
lldb::ThreadPlanSP GetStepThroughTrampolinePlan(lldb_private::Thread &thread,
bool stop_others) override;
lldb_private::Status CanLoadImage() override;
lldb::addr_t GetThreadLocalData(const lldb::ModuleSP module,
const lldb::ThreadSP thread,
lldb::addr_t tls_file_addr) override;
// PluginInterface protocol
lldb_private::ConstString GetPluginName() override;
uint32_t GetPluginVersion() override;
protected:
/// Runtime linker rendezvous structure.
DYLDRendezvous m_rendezvous;
/// Virtual load address of the inferior process.
lldb::addr_t m_load_offset;
/// Virtual entry address of the inferior process.
lldb::addr_t m_entry_point;
/// Auxiliary vector of the inferior process.
std::unique_ptr<AuxVector> m_auxv;
/// Rendezvous breakpoint.
lldb::break_id_t m_dyld_bid;
/// Contains AT_SYSINFO_EHDR, which means a vDSO has been
/// mapped to the address space
lldb::addr_t m_vdso_base;
/// Contains AT_BASE, which means a dynamic loader has been
/// mapped to the address space
lldb::addr_t m_interpreter_base;
/// Loaded module list. (link map for each module)
std::map<lldb::ModuleWP, lldb::addr_t, std::owner_less<lldb::ModuleWP>>
m_loaded_modules;
/// If possible sets a breakpoint on a function called by the runtime
/// linker each time a module is loaded or unloaded.
bool SetRendezvousBreakpoint();
/// Callback routine which updates the current list of loaded modules based
/// on the information supplied by the runtime linker.
static bool RendezvousBreakpointHit(
void *baton, lldb_private::StoppointCallbackContext *context,
lldb::user_id_t break_id, lldb::user_id_t break_loc_id);
/// Helper method for RendezvousBreakpointHit. Updates LLDB's current set
/// of loaded modules.
void RefreshModules();
/// Updates the load address of every allocatable section in \p module.
///
/// \param module The module to traverse.
///
/// \param link_map_addr The virtual address of the link map for the @p
/// module.
///
/// \param base_addr The virtual base address \p module is loaded at.
void UpdateLoadedSections(lldb::ModuleSP module, lldb::addr_t link_map_addr,
lldb::addr_t base_addr,
bool base_addr_is_offset) override;
/// Removes the loaded sections from the target in \p module.
///
/// \param module The module to traverse.
void UnloadSections(const lldb::ModuleSP module) override;
/// Resolves the entry point for the current inferior process and sets a
/// breakpoint at that address.
void ProbeEntry();
/// Callback routine invoked when we hit the breakpoint on process entry.
///
/// This routine is responsible for resolving the load addresses of all
/// dependent modules required by the inferior and setting up the rendezvous
/// breakpoint.
static bool
EntryBreakpointHit(void *baton,
lldb_private::StoppointCallbackContext *context,
lldb::user_id_t break_id, lldb::user_id_t break_loc_id);
/// Helper for the entry breakpoint callback. Resolves the load addresses
/// of all dependent modules.
virtual void LoadAllCurrentModules();
void LoadVDSO();
// Loading an interpreter module (if present) assuming m_interpreter_base
// already points to its base address.
lldb::ModuleSP LoadInterpreterModule();
/// Computes a value for m_load_offset returning the computed address on
/// success and LLDB_INVALID_ADDRESS on failure.
lldb::addr_t ComputeLoadOffset();
/// Computes a value for m_entry_point returning the computed address on
/// success and LLDB_INVALID_ADDRESS on failure.
lldb::addr_t GetEntryPoint();
/// Evaluate if Aux vectors contain vDSO and LD information
/// in case they do, read and assign the address to m_vdso_base
/// and m_interpreter_base.
void EvalSpecialModulesStatus();
/// Loads Module from inferior process.
void ResolveExecutableModule(lldb::ModuleSP &module_sp);
bool AlwaysRelyOnEHUnwindInfo(lldb_private::SymbolContext &sym_ctx) override;
private:
DynamicLoaderPOSIXDYLD(const DynamicLoaderPOSIXDYLD &) = delete;
const DynamicLoaderPOSIXDYLD &
operator=(const DynamicLoaderPOSIXDYLD &) = delete;
};
#endif // LLDB_SOURCE_PLUGINS_DYNAMICLOADER_POSIX_DYLD_DYNAMICLOADERPOSIXDYLD_H
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