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kern: implement new thread context/fpu semantics

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Michael Scire 2022-03-22 19:59:39 -07:00 • committed by SciresM
parent 79afa3b64c
commit 6e17317d5d
21 changed files with 1291 additions and 668 deletions
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118
libraries/libmesosphere/source/kern_k_thread.cpp
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@ -68,6 +68,91 @@ namespace ams::kern {
}
ALWAYS_INLINE void KThread::SetPinnedSvcPermissions() {
/* Get our stack parameters. */
auto &sp = this->GetStackParameters();
/* Get our parent's svc permissions. */
MESOSPHERE_ASSERT(m_parent != nullptr);
const auto &svc_permissions = m_parent->GetSvcPermissions();
/* Get whether we have access to return from exception. */
const bool return_from_exception = sp.svc_access_flags[svc::SvcId_ReturnFromException];
/* Clear all permissions. */
sp.svc_access_flags.Reset();
/* Set SynchronizePreemptionState if allowed. */
if (svc_permissions[svc::SvcId_SynchronizePreemptionState]) {
sp.svc_access_flags[svc::SvcId_SynchronizePreemptionState] = true;
}
/* If we previously had ReturnFromException, potentially grant it and GetInfo. */
if (return_from_exception) {
/* Set ReturnFromException (guaranteed allowed, if we're here). */
sp.svc_access_flags[svc::SvcId_ReturnFromException] = true;
/* Set GetInfo if allowed. */
if (svc_permissions[svc::SvcId_GetInfo]) {
sp.svc_access_flags[svc::SvcId_GetInfo] = true;
}
}
}
ALWAYS_INLINE void KThread::SetUnpinnedSvcPermissions() {
/* Get our stack parameters. */
auto &sp = this->GetStackParameters();
/* Get our parent's svc permissions. */
MESOSPHERE_ASSERT(m_parent != nullptr);
const auto &svc_permissions = m_parent->GetSvcPermissions();
/* Get whether we have access to return from exception. */
const bool return_from_exception = sp.svc_access_flags[svc::SvcId_ReturnFromException];
/* Copy permissions. */
sp.svc_access_flags = svc_permissions;
/* Clear specific SVCs based on our state. */
sp.svc_access_flags[svc::SvcId_SynchronizePreemptionState] = false;
if (!return_from_exception) {
sp.svc_access_flags[svc::SvcId_ReturnFromException] = false;
}
}
ALWAYS_INLINE void KThread::SetUsermodeExceptionSvcPermissions() {
/* Get our stack parameters. */
auto &sp = this->GetStackParameters();
/* Get our parent's svc permissions. */
MESOSPHERE_ASSERT(m_parent != nullptr);
const auto &svc_permissions = m_parent->GetSvcPermissions();
/* Set ReturnFromException if allowed. */
if (svc_permissions[svc::SvcId_ReturnFromException]) {
sp.svc_access_flags[svc::SvcId_ReturnFromException] = true;
}
/* Set GetInfo if allowed. */
if (svc_permissions[svc::SvcId_GetInfo]) {
sp.svc_access_flags[svc::SvcId_GetInfo] = true;
}
}
ALWAYS_INLINE void KThread::ClearUsermodeExceptionSvcPermissions() {
/* Get our stack parameters. */
auto &sp = this->GetStackParameters();
/* Clear ReturnFromException. */
sp.svc_access_flags[svc::SvcId_ReturnFromException] = false;
/* If pinned, clear GetInfo. */
if (sp.is_pinned) {
sp.svc_access_flags[svc::SvcId_GetInfo] = false;
}
}
Result KThread::Initialize(KThreadFunction func, uintptr_t arg, void *kern_stack_top, KProcessAddress user_stack_top, s32 prio, s32 virt_core, KProcess *owner, ThreadType type) {
/* Assert parameters are valid. */
MESOSPHERE_ASSERT_THIS();
@ -209,18 +294,23 @@ namespace ams::kern {
const bool is_64_bit = m_parent ? m_parent->Is64Bit() : IsDefault64Bit;
const bool is_user = (type == ThreadType_User);
const bool is_main = (type == ThreadType_Main);
m_thread_context.Initialize(reinterpret_cast<uintptr_t>(func), reinterpret_cast<uintptr_t>(this->GetStackTop()), GetInteger(user_stack_top), arg, is_user, is_64_bit, is_main);
this->GetContext().Initialize(reinterpret_cast<uintptr_t>(func), reinterpret_cast<uintptr_t>(this->GetStackTop()), GetInteger(user_stack_top), arg, is_user, is_64_bit, is_main);
/* Setup the stack parameters. */
StackParameters &sp = this->GetStackParameters();
if (m_parent != nullptr) {
m_parent->CopySvcPermissionsTo(sp);
this->SetUnpinnedSvcPermissions();
this->ClearUsermodeExceptionSvcPermissions();
}
sp.context = std::addressof(m_thread_context);
sp.cur_thread = this;
sp.disable_count = 1;
sp.caller_save_fpu_registers = std::addressof(m_caller_save_fpu_registers);
sp.cur_thread = this;
sp.disable_count = 1;
this->SetInExceptionHandler();
if (m_parent != nullptr && is_64_bit) {
this->SetFpu64Bit();
}
/* Set thread ID. */
m_thread_id = g_thread_id++;
@ -329,9 +419,6 @@ namespace ams::kern {
}
}
/* Finalize the thread context. */
m_thread_context.Finalize();
/* Cleanup the kernel stack. */
if (m_kernel_stack_top != nullptr) {
CleanupKernelStack(reinterpret_cast<uintptr_t>(m_kernel_stack_top));
@ -411,6 +498,16 @@ namespace ams::kern {
this->FinishTermination();
}
void KThread::OnEnterUsermodeException() {
this->SetUsermodeExceptionSvcPermissions();
this->SetInUsermodeExceptionHandler();
}
void KThread::OnLeaveUsermodeException() {
this->ClearUsermodeExceptionSvcPermissions();
this->ClearInUsermodeExceptionHandler();
}
void KThread::Pin() {
MESOSPHERE_ASSERT_THIS();
MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
@ -458,8 +555,7 @@ namespace ams::kern {
}
/* Update our SVC access permissions. */
MESOSPHERE_ASSERT(m_parent != nullptr);
m_parent->CopyPinnedSvcPermissionsTo(this->GetStackParameters());
this->SetPinnedSvcPermissions();
}
void KThread::Unpin() {
@ -507,7 +603,7 @@ namespace ams::kern {
/* Update our SVC access permissions. */
MESOSPHERE_ASSERT(m_parent != nullptr);
m_parent->CopyUnpinnedSvcPermissionsTo(this->GetStackParameters());
this->SetUnpinnedSvcPermissions();
}
/* Resume any threads that began waiting on us while we were pinned. */