kernel: clone fpu status on CreateThread
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@ -49,6 +49,7 @@ static void ResetThreadContext32(Core::ARM_Interface::ThreadContext32& context,
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context.cpu_registers[0] = arg;
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context.cpu_registers[15] = entry_point;
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context.cpu_registers[13] = stack_top;
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context.fpscr = 0;
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}
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static void ResetThreadContext64(Core::ARM_Interface::ThreadContext64& context, VAddr stack_top,
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@ -58,8 +59,8 @@ static void ResetThreadContext64(Core::ARM_Interface::ThreadContext64& context,
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context.cpu_registers[18] = Kernel::KSystemControl::GenerateRandomU64() | 1;
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context.pc = entry_point;
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context.sp = stack_top;
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// TODO(merry): Perform a hardware test to determine the below value.
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context.fpcr = 0;
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context.fpsr = 0;
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}
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} // namespace
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@ -815,6 +816,27 @@ void KThread::Continue() {
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KScheduler::OnThreadStateChanged(kernel, this, old_state);
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}
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void KThread::CloneFpuStatus() {
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// We shouldn't reach here when starting kernel threads.
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ASSERT(this->GetOwnerProcess() != nullptr);
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ASSERT(this->GetOwnerProcess() == GetCurrentProcessPointer(kernel));
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if (this->GetOwnerProcess()->Is64BitProcess()) {
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// Clone FPSR and FPCR.
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ThreadContext64 cur_ctx{};
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kernel.System().CurrentArmInterface().SaveContext(cur_ctx);
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this->GetContext64().fpcr = cur_ctx.fpcr;
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this->GetContext64().fpsr = cur_ctx.fpsr;
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} else {
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// Clone FPSCR.
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ThreadContext32 cur_ctx{};
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kernel.System().CurrentArmInterface().SaveContext(cur_ctx);
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this->GetContext32().fpscr = cur_ctx.fpscr;
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}
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}
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Result KThread::SetActivity(Svc::ThreadActivity activity) {
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// Lock ourselves.
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KScopedLightLock lk(activity_pause_lock);
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@ -254,6 +254,8 @@ public:
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thread_context_32.tpidr = static_cast<u32>(value);
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}
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void CloneFpuStatus();
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[[nodiscard]] ThreadContext32& GetContext32() {
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return thread_context_32;
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}
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@ -82,6 +82,9 @@ Result CreateThread(Core::System& system, Handle* out_handle, VAddr entry_point,
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// Commit the thread reservation.
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thread_reservation.Commit();
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// Clone the current fpu status to the new thread.
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thread->CloneFpuStatus();
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// Register the new thread.
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KThread::Register(kernel, thread);
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