Ryujinx/Ryujinx.Core/OsHle/Kernel/SvcThreadSync.cs

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using ChocolArm64.State;
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using Ryujinx.Core.Logging;
using Ryujinx.Core.OsHle.Handles;
using System;
using System.Threading;
using static Ryujinx.Core.OsHle.ErrorCode;
namespace Ryujinx.Core.OsHle.Kernel
{
partial class SvcHandler
{
private const int MutexHasListenersMask = 0x40000000;
private void SvcArbitrateLock(AThreadState ThreadState)
{
int OwnerThreadHandle = (int)ThreadState.X0;
long MutexAddress = (long)ThreadState.X1;
int WaitThreadHandle = (int)ThreadState.X2;
if (IsPointingInsideKernel(MutexAddress))
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Invalid mutex address 0x{MutexAddress:x16}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidAddress);
return;
}
if (IsWordAddressUnaligned(MutexAddress))
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Unaligned mutex address 0x{MutexAddress:x16}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidAlignment);
return;
}
KThread OwnerThread = Process.HandleTable.GetData<KThread>(OwnerThreadHandle);
if (OwnerThread == null)
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Invalid owner thread handle 0x{OwnerThreadHandle:x8}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidHandle);
return;
}
KThread WaitThread = Process.HandleTable.GetData<KThread>(WaitThreadHandle);
if (WaitThread == null)
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Invalid requesting thread handle 0x{WaitThreadHandle:x8}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidHandle);
return;
}
KThread CurrThread = Process.GetThread(ThreadState.Tpidr);
MutexLock(CurrThread, WaitThread, OwnerThreadHandle, WaitThreadHandle, MutexAddress);
ThreadState.X0 = 0;
}
private void SvcArbitrateUnlock(AThreadState ThreadState)
{
long MutexAddress = (long)ThreadState.X0;
if (IsPointingInsideKernel(MutexAddress))
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Invalid mutex address 0x{MutexAddress:x16}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidAddress);
return;
}
if (IsWordAddressUnaligned(MutexAddress))
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Unaligned mutex address 0x{MutexAddress:x16}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidAlignment);
return;
}
if (MutexUnlock(Process.GetThread(ThreadState.Tpidr), MutexAddress))
{
Process.Scheduler.Yield(Process.GetThread(ThreadState.Tpidr));
}
ThreadState.X0 = 0;
}
private void SvcWaitProcessWideKeyAtomic(AThreadState ThreadState)
{
long MutexAddress = (long)ThreadState.X0;
long CondVarAddress = (long)ThreadState.X1;
int ThreadHandle = (int)ThreadState.X2;
ulong Timeout = ThreadState.X3;
if (IsPointingInsideKernel(MutexAddress))
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Invalid mutex address 0x{MutexAddress:x16}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidAddress);
return;
}
if (IsWordAddressUnaligned(MutexAddress))
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Unaligned mutex address 0x{MutexAddress:x16}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidAlignment);
return;
}
KThread Thread = Process.HandleTable.GetData<KThread>(ThreadHandle);
if (Thread == null)
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Invalid thread handle 0x{ThreadHandle:x8}!");
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.InvalidHandle);
return;
}
KThread CurrThread = Process.GetThread(ThreadState.Tpidr);
MutexUnlock(CurrThread, MutexAddress);
if (!CondVarWait(CurrThread, ThreadHandle, MutexAddress, CondVarAddress, Timeout))
{
ThreadState.X0 = MakeError(ErrorModule.Kernel, KernelErr.Timeout);
return;
}
Process.Scheduler.Yield(Process.GetThread(ThreadState.Tpidr));
ThreadState.X0 = 0;
}
private void SvcSignalProcessWideKey(AThreadState ThreadState)
{
long CondVarAddress = (long)ThreadState.X0;
int Count = (int)ThreadState.X1;
CondVarSignal(CondVarAddress, Count);
ThreadState.X0 = 0;
}
private void MutexLock(
KThread CurrThread,
KThread WaitThread,
int OwnerThreadHandle,
int WaitThreadHandle,
long MutexAddress)
{
int MutexValue = Process.Memory.ReadInt32(MutexAddress);
if (MutexValue != (OwnerThreadHandle | MutexHasListenersMask))
{
return;
}
CurrThread.WaitHandle = WaitThreadHandle;
CurrThread.MutexAddress = MutexAddress;
InsertWaitingMutexThread(OwnerThreadHandle, WaitThread);
Process.Scheduler.EnterWait(WaitThread);
}
private bool MutexUnlock(KThread CurrThread, long MutexAddress)
{
if (CurrThread == null)
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Invalid mutex 0x{MutexAddress:x16}!");
return false;
}
lock (CurrThread)
{
//This is the new thread that will not own the mutex.
//If no threads are waiting for the lock, then it should be null.
KThread OwnerThread = CurrThread.NextMutexThread;
while (OwnerThread != null && OwnerThread.MutexAddress != MutexAddress)
{
OwnerThread = OwnerThread.NextMutexThread;
}
CurrThread.NextMutexThread = null;
if (OwnerThread != null)
{
int HasListeners = OwnerThread.NextMutexThread != null ? MutexHasListenersMask : 0;
Process.Memory.WriteInt32(MutexAddress, HasListeners | OwnerThread.WaitHandle);
OwnerThread.WaitHandle = 0;
OwnerThread.MutexAddress = 0;
OwnerThread.CondVarAddress = 0;
OwnerThread.MutexOwner = null;
OwnerThread.UpdatePriority();
Process.Scheduler.WakeUp(OwnerThread);
return true;
}
else
{
Process.Memory.WriteInt32(MutexAddress, 0);
return false;
}
}
}
private bool CondVarWait(
KThread WaitThread,
int WaitThreadHandle,
long MutexAddress,
long CondVarAddress,
ulong Timeout)
{
WaitThread.WaitHandle = WaitThreadHandle;
WaitThread.MutexAddress = MutexAddress;
WaitThread.CondVarAddress = CondVarAddress;
lock (CondVarLock)
{
KThread CurrThread = Process.ThreadArbiterList;
if (CurrThread != null)
{
bool DoInsert = CurrThread != WaitThread;
while (CurrThread.NextCondVarThread != null)
{
if (CurrThread.NextCondVarThread.ActualPriority < WaitThread.ActualPriority)
{
break;
}
CurrThread = CurrThread.NextCondVarThread;
DoInsert &= CurrThread != WaitThread;
}
//Only insert if the node doesn't already exist in the list.
//This prevents circular references.
if (DoInsert)
{
if (WaitThread.NextCondVarThread != null)
{
throw new InvalidOperationException();
}
WaitThread.NextCondVarThread = CurrThread.NextCondVarThread;
CurrThread.NextCondVarThread = WaitThread;
}
}
else
{
Process.ThreadArbiterList = WaitThread;
}
}
if (Timeout != ulong.MaxValue)
{
return Process.Scheduler.EnterWait(WaitThread, NsTimeConverter.GetTimeMs(Timeout));
}
else
{
return Process.Scheduler.EnterWait(WaitThread);
}
}
private void CondVarSignal(long CondVarAddress, int Count)
{
lock (CondVarLock)
{
KThread PrevThread = null;
KThread CurrThread = Process.ThreadArbiterList;
while (CurrThread != null && (Count == -1 || Count > 0))
{
if (CurrThread.CondVarAddress == CondVarAddress)
{
if (PrevThread != null)
{
PrevThread.NextCondVarThread = CurrThread.NextCondVarThread;
}
else
{
Process.ThreadArbiterList = CurrThread.NextCondVarThread;
}
CurrThread.NextCondVarThread = null;
AcquireMutexValue(CurrThread.MutexAddress);
int MutexValue = Process.Memory.ReadInt32(CurrThread.MutexAddress);
MutexValue &= ~MutexHasListenersMask;
if (MutexValue == 0)
{
//Give the lock to this thread.
Process.Memory.WriteInt32(CurrThread.MutexAddress, CurrThread.WaitHandle);
CurrThread.WaitHandle = 0;
CurrThread.MutexAddress = 0;
CurrThread.CondVarAddress = 0;
CurrThread.MutexOwner = null;
CurrThread.UpdatePriority();
Process.Scheduler.WakeUp(CurrThread);
}
else
{
//Wait until the lock is released.
InsertWaitingMutexThread(MutexValue, CurrThread);
MutexValue |= MutexHasListenersMask;
Process.Memory.WriteInt32(CurrThread.MutexAddress, MutexValue);
}
ReleaseMutexValue(CurrThread.MutexAddress);
Count--;
}
PrevThread = CurrThread;
CurrThread = CurrThread.NextCondVarThread;
}
}
}
private void InsertWaitingMutexThread(int OwnerThreadHandle, KThread WaitThread)
{
KThread OwnerThread = Process.HandleTable.GetData<KThread>(OwnerThreadHandle);
if (OwnerThread == null)
{
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Ns.Log.PrintWarning(LogClass.KernelSvc, $"Invalid thread handle 0x{OwnerThreadHandle:x8}!");
return;
}
WaitThread.MutexOwner = OwnerThread;
lock (OwnerThread)
{
KThread CurrThread = OwnerThread;
while (CurrThread.NextMutexThread != null)
{
if (CurrThread == WaitThread)
{
return;
}
if (CurrThread.NextMutexThread.ActualPriority < WaitThread.ActualPriority)
{
break;
}
CurrThread = CurrThread.NextMutexThread;
}
if (CurrThread != WaitThread)
{
if (WaitThread.NextCondVarThread != null)
{
throw new InvalidOperationException();
}
WaitThread.NextMutexThread = CurrThread.NextMutexThread;
CurrThread.NextMutexThread = WaitThread;
}
}
OwnerThread.UpdatePriority();
}
private void AcquireMutexValue(long MutexAddress)
{
while (!Process.Memory.AcquireAddress(MutexAddress))
{
Thread.Yield();
}
}
private void ReleaseMutexValue(long MutexAddress)
{
Process.Memory.ReleaseAddress(MutexAddress);
}
private bool IsPointingInsideKernel(long Address)
{
return ((ulong)Address + 0x1000000000) < 0xffffff000;
}
private bool IsWordAddressUnaligned(long Address)
{
return (Address & 3) != 0;
}
}
}