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-rw-r--r--src/core/hle/kernel/thread.cpp49
1 files changed, 49 insertions, 0 deletions
diff --git a/src/core/hle/kernel/thread.cpp b/src/core/hle/kernel/thread.cpp
index 3f6bec5fa..492c821e3 100644
--- a/src/core/hle/kernel/thread.cpp
+++ b/src/core/hle/kernel/thread.cpp
@@ -182,6 +182,48 @@ 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