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kern: update pinning semantics for terminating threads

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This commit is contained in:
Michael Scire 2021-04-07 15:30:13 -07:00 committed by SciresM
parent afb1d68d06
commit 6faa3534bf
4 changed files with 48 additions and 15 deletions
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5
libraries/libmesosphere/include/mesosphere/kern_k_process.hpp
View file

@ -127,14 +127,14 @@ namespace ams::kern {
Result StartTermination();
void FinishTermination();
void PinThread(s32 core_id, KThread *thread) {
ALWAYS_INLINE void PinThread(s32 core_id, KThread *thread) {
MESOSPHERE_ASSERT(0 <= core_id && core_id < static_cast<s32>(cpu::NumCores));
MESOSPHERE_ASSERT(thread != nullptr);
MESOSPHERE_ASSERT(m_pinned_threads[core_id] == nullptr);
m_pinned_threads[core_id] = thread;
}
void UnpinThread(s32 core_id, KThread *thread) {
ALWAYS_INLINE void UnpinThread(s32 core_id, KThread *thread) {
MESOSPHERE_UNUSED(thread);
MESOSPHERE_ASSERT(0 <= core_id && core_id < static_cast<s32>(cpu::NumCores));
MESOSPHERE_ASSERT(thread != nullptr);
@ -340,6 +340,7 @@ namespace ams::kern {
void PinCurrentThread();
void UnpinCurrentThread();
void UnpinThread(KThread *thread);
Result SignalToAddress(KProcessAddress address) {
return m_cond_var.SignalToAddress(address);

5
libraries/libmesosphere/source/arch/arm64/kern_exception_handlers.cpp
View file

@ -521,6 +521,11 @@ namespace ams::kern::arch::arm64 {
{
KScopedInterruptEnable ei;
/* Terminate the thread, if we should. */
if (GetCurrentThread().IsTerminationRequested()) {
GetCurrentThread().Exit();
}
HandleUserException(context, esr, far, afsr0, afsr1, data);
}
} else {

24
libraries/libmesosphere/source/kern_k_process.cpp
View file

@ -34,6 +34,13 @@ namespace ams::kern {
KScopedLightLock proc_lk(process->GetListLock());
KScopedSchedulerLock sl;
if (thread_to_not_terminate != nullptr && process->GetPinnedThread(GetCurrentCoreId()) == thread_to_not_terminate) {
/* NOTE: Here Nintendo unpins the current thread instead of the thread_to_not_terminate. */
/* This is valid because the only caller which uses non-nullptr as argument uses GetCurrentThreadPointer(), */
/* but it's still notable because it seems incorrect at first glance. */
process->UnpinCurrentThread();
}
auto &thread_list = process->GetThreadList();
for (auto it = thread_list.begin(); it != thread_list.end(); ++it) {
if (KThread *thread = std::addressof(*it); thread != thread_to_not_terminate) {
@ -1020,6 +1027,8 @@ namespace ams::kern {
const s32 core_id = GetCurrentCoreId();
KThread *cur_thread = GetCurrentThreadPointer();
/* If the thread isn't terminated, pin it. */
if (!cur_thread->IsTerminationRequested()) {
/* Pin it. */
this->PinThread(core_id, cur_thread);
cur_thread->Pin();
@ -1027,6 +1036,7 @@ namespace ams::kern {
/* An update is needed. */
KScheduler::SetSchedulerUpdateNeeded();
}
}
void KProcess::UnpinCurrentThread() {
MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
@ -1043,6 +1053,20 @@ namespace ams::kern {
KScheduler::SetSchedulerUpdateNeeded();
}
void KProcess::UnpinThread(KThread *thread) {
MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
/* Get the thread's core id. */
const auto core_id = thread->GetActiveCore();
/* Unpin it. */
this->UnpinThread(core_id, thread);
thread->Unpin();
/* An update is needed. */
KScheduler::SetSchedulerUpdateNeeded();
}
Result KProcess::GetThreadList(s32 *out_num_threads, ams::kern::svc::KUserPointer<u64 *> out_thread_ids, s32 max_out_count) {
/* Lock the list. */
KScopedLightLock lk(m_list_lock);

11
libraries/libmesosphere/source/kern_k_thread.cpp
View file

@ -483,19 +483,17 @@ namespace ams::kern {
}
/* Allow performing thread suspension (if termination hasn't been requested). */
{
/* Update our allow flags. */
if (!this->IsTerminationRequested()) {
/* Update our allow flags. */
m_suspend_allowed_flags |= (1 << (SuspendType_Thread + ThreadState_SuspendShift));
}
/* Update our state. */
this->UpdateState();
}
/* Update our SVC access permissions. */
MESOSPHERE_ASSERT(m_parent != nullptr);
m_parent->CopyUnpinnedSvcPermissionsTo(this->GetStackParameters());
}
/* Resume any threads that began waiting on us while we were pinned. */
for (auto it = m_pinned_waiter_list.begin(); it != m_pinned_waiter_list.end(); ++it) {
@ -1218,6 +1216,11 @@ namespace ams::kern {
/* Register the terminating dpc. */
this->RegisterDpc(DpcFlag_Terminating);
/* If the thread is pinned, unpin it. */
if (this->GetStackParameters().is_pinned) {
this->GetOwnerProcess()->UnpinThread(this);
}
/* If the thread is suspended, continue it. */
if (this->IsSuspended()) {
m_suspend_allowed_flags = 0;