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Merge pull request #1877 from wwylele/wait-fix-timeout 

Thread: update timeout when reruning WaitSynch
This commit is contained in:
bunnei 2016-06-18 01:08:22 -04:00 committed by GitHub
parent 0473b59256 7d56e88369
commit 8f86cc4df9
1 changed files with 49 additions and 0 deletions
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49
src/core/hle/kernel/thread.cpp
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@ -181,6 +181,48 @@ static void PriorityBoostStarvedThreads() {
}
}
/**
* Gets the registers for timeout parameter of the next WaitSynchronization call.
* @param thread a pointer to the thread that is ready to call WaitSynchronization
* @returns a tuple of two register pointers to low and high part of the timeout parameter
*/
static std::tuple<u32*, u32*> GetWaitSynchTimeoutParameterRegister(Thread* thread) {
bool thumb_mode = (thread->context.cpsr & TBIT) != 0;
u16 thumb_inst = Memory::Read16(thread->context.pc & 0xFFFFFFFE);
u32 inst = Memory::Read32(thread->context.pc & 0xFFFFFFFC) & 0x0FFFFFFF;
if ((thumb_mode && thumb_inst == 0xDF24) || (!thumb_mode && inst == 0x0F000024)) {
// svc #0x24 (WaitSynchronization1)
return std::make_tuple(&thread->context.cpu_registers[2], &thread->context.cpu_registers[3]);
} else if ((thumb_mode && thumb_inst == 0xDF25) || (!thumb_mode && inst == 0x0F000025)) {
// svc #0x25 (WaitSynchronizationN)
return std::make_tuple(&thread->context.cpu_registers[0], &thread->context.cpu_registers[4]);
}
UNREACHABLE();
}
/**
* Updates the WaitSynchronization timeout paramter according to the difference
* between ticks of the last WaitSynchronization call and the incoming one.
* @param timeout_low a pointer to the register for the low part of the timeout parameter
* @param timeout_high a pointer to the register for the high part of the timeout parameter
* @param last_tick tick of the last WaitSynchronization call
*/
static void UpdateTimeoutParameter(u32* timeout_low, u32* timeout_high, u64 last_tick) {
s64 timeout = ((s64)*timeout_high << 32) | *timeout_low;
if (timeout != -1) {
timeout -= cyclesToUs(CoreTiming::GetTicks() - last_tick) * 1000; // in nanoseconds
if (timeout < 0)
timeout = 0;
*timeout_low = timeout & 0xFFFFFFFF;
*timeout_high = timeout >> 32;
}
}
/**
* Switches the CPU's active thread context to that of the specified thread
* @param new_thread The thread to switch to
@ -219,6 +261,13 @@ static void SwitchContext(Thread* new_thread) {
// SVC instruction is 2 bytes for THUMB, 4 bytes for ARM
new_thread->context.pc -= thumb_mode ? 2 : 4;
// Get the register for timeout parameter
u32* timeout_low, *timeout_high;
std::tie(timeout_low, timeout_high) = GetWaitSynchTimeoutParameterRegister(new_thread);
// Update the timeout parameter
UpdateTimeoutParameter(timeout_low, timeout_high, new_thread->last_running_ticks);
}
// Clean up the thread's wait_objects, they'll be restored if needed during