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kernel: fix debugger and process list lifetime

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This commit is contained in:
Liam
2024-01-02 17:12:16 -05:00
parent f2fed21c11
commit f90a022d3a
9 changed files with 160 additions and 107 deletions
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39
src/core/debugger/debugger.cpp
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@ -114,7 +114,7 @@ public:
}
Kernel::KThread* GetActiveThread() override {
return state->active_thread;
return state->active_thread.GetPointerUnsafe();
}
private:
@ -147,11 +147,14 @@ private:
std::scoped_lock lk{connection_lock};
// Find the process we are going to debug.
SetDebugProcess();
// Ensure everything is stopped.
PauseEmulation();
// Set up the new frontend.
frontend = std::make_unique<GDBStub>(*this, system);
frontend = std::make_unique<GDBStub>(*this, system, debug_process.GetPointerUnsafe());
// Set the new state. This will tear down any existing state.
state = ConnectionState{
@ -194,15 +197,20 @@ private:
UpdateActiveThread();
if (state->info.type == SignalType::Watchpoint) {
frontend->Watchpoint(state->active_thread, *state->info.watchpoint);
frontend->Watchpoint(std::addressof(*state->active_thread),
*state->info.watchpoint);
} else {
frontend->Stopped(state->active_thread);
frontend->Stopped(std::addressof(*state->active_thread));
}
break;
case SignalType::ShuttingDown:
frontend->ShuttingDown();
// Release members.
state->active_thread.Reset(nullptr);
debug_process.Reset(nullptr);
// Wait for emulation to shut down gracefully now.
state->signal_pipe.close();
state->client_socket.shutdown(boost::asio::socket_base::shutdown_both);
@ -222,7 +230,7 @@ private:
stopped = true;
PauseEmulation();
UpdateActiveThread();
frontend->Stopped(state->active_thread);
frontend->Stopped(state->active_thread.GetPointerUnsafe());
break;
}
case DebuggerAction::Continue:
@ -232,7 +240,7 @@ private:
MarkResumed([&] {
state->active_thread->SetStepState(Kernel::StepState::StepPending);
state->active_thread->Resume(Kernel::SuspendType::Debug);
ResumeEmulation(state->active_thread);
ResumeEmulation(state->active_thread.GetPointerUnsafe());
});
break;
case DebuggerAction::StepThreadLocked: {
@ -255,6 +263,7 @@ private:
}
void PauseEmulation() {
Kernel::KScopedLightLock ll{debug_process->GetListLock()};
Kernel::KScopedSchedulerLock sl{system.Kernel()};
// Put all threads to sleep on next scheduler round.
@ -264,6 +273,9 @@ private:
}
void ResumeEmulation(Kernel::KThread* except = nullptr) {
Kernel::KScopedLightLock ll{debug_process->GetListLock()};
Kernel::KScopedSchedulerLock sl{system.Kernel()};
// Wake up all threads.
for (auto& thread : ThreadList()) {
if (std::addressof(thread) == except) {
@ -277,15 +289,16 @@ private:
template <typename Callback>
void MarkResumed(Callback&& cb) {
Kernel::KScopedSchedulerLock sl{system.Kernel()};
stopped = false;
cb();
}
void UpdateActiveThread() {
Kernel::KScopedLightLock ll{debug_process->GetListLock()};
auto& threads{ThreadList()};
for (auto& thread : threads) {
if (std::addressof(thread) == state->active_thread) {
if (std::addressof(thread) == state->active_thread.GetPointerUnsafe()) {
// Thread is still alive, no need to update.
return;
}
@ -293,12 +306,18 @@ private:
state->active_thread = std::addressof(threads.front());
}
private:
void SetDebugProcess() {
debug_process = std::move(system.Kernel().GetProcessList().back());
}
Kernel::KProcess::ThreadList& ThreadList() {
return system.ApplicationProcess()->GetThreadList();
return debug_process->GetThreadList();
}
private:
System& system;
Kernel::KScopedAutoObject<Kernel::KProcess> debug_process;
std::unique_ptr<DebuggerFrontend> frontend;
boost::asio::io_context io_context;
@ -310,7 +329,7 @@ private:
boost::process::async_pipe signal_pipe;
SignalInfo info;
Kernel::KThread* active_thread;
Kernel::KScopedAutoObject<Kernel::KThread> active_thread;
std::array<u8, 4096> client_data;
bool pipe_data;
};