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Merge pull request #1877 from wwylele/wait-fix-timeout
Thread: update timeout when reruning WaitSynch
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commit
8f86cc4df9
@ -181,6 +181,48 @@ static void PriorityBoostStarvedThreads() {
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}
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}
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/**
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* Gets the registers for timeout parameter of the next WaitSynchronization call.
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* @param thread a pointer to the thread that is ready to call WaitSynchronization
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* @returns a tuple of two register pointers to low and high part of the timeout parameter
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*/
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static std::tuple<u32*, u32*> GetWaitSynchTimeoutParameterRegister(Thread* thread) {
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bool thumb_mode = (thread->context.cpsr & TBIT) != 0;
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u16 thumb_inst = Memory::Read16(thread->context.pc & 0xFFFFFFFE);
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u32 inst = Memory::Read32(thread->context.pc & 0xFFFFFFFC) & 0x0FFFFFFF;
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if ((thumb_mode && thumb_inst == 0xDF24) || (!thumb_mode && inst == 0x0F000024)) {
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// svc #0x24 (WaitSynchronization1)
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return std::make_tuple(&thread->context.cpu_registers[2], &thread->context.cpu_registers[3]);
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} else if ((thumb_mode && thumb_inst == 0xDF25) || (!thumb_mode && inst == 0x0F000025)) {
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// svc #0x25 (WaitSynchronizationN)
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return std::make_tuple(&thread->context.cpu_registers[0], &thread->context.cpu_registers[4]);
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}
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UNREACHABLE();
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}
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/**
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* Updates the WaitSynchronization timeout paramter according to the difference
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* between ticks of the last WaitSynchronization call and the incoming one.
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* @param timeout_low a pointer to the register for the low part of the timeout parameter
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* @param timeout_high a pointer to the register for the high part of the timeout parameter
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* @param last_tick tick of the last WaitSynchronization call
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*/
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static void UpdateTimeoutParameter(u32* timeout_low, u32* timeout_high, u64 last_tick) {
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s64 timeout = ((s64)*timeout_high << 32) | *timeout_low;
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if (timeout != -1) {
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timeout -= cyclesToUs(CoreTiming::GetTicks() - last_tick) * 1000; // in nanoseconds
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if (timeout < 0)
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timeout = 0;
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*timeout_low = timeout & 0xFFFFFFFF;
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*timeout_high = timeout >> 32;
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}
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}
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/**
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* Switches the CPU's active thread context to that of the specified thread
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* @param new_thread The thread to switch to
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@ -219,6 +261,13 @@ static void SwitchContext(Thread* new_thread) {
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// SVC instruction is 2 bytes for THUMB, 4 bytes for ARM
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new_thread->context.pc -= thumb_mode ? 2 : 4;
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// Get the register for timeout parameter
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u32* timeout_low, *timeout_high;
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std::tie(timeout_low, timeout_high) = GetWaitSynchTimeoutParameterRegister(new_thread);
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// Update the timeout parameter
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UpdateTimeoutParameter(timeout_low, timeout_high, new_thread->last_running_ticks);
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}
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// Clean up the thread's wait_objects, they'll be restored if needed during
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