private static void EmitStore(ILEmitterCtx context, AccessType accType, bool pair)
{
OpCodeMemEx64 op = (OpCodeMemEx64)context.CurrOp;
bool ordered = (accType & AccessType.Ordered) != 0;
bool exclusive = (accType & AccessType.Exclusive) != 0;
if (ordered)
{
EmitBarrier(context);
}
if (exclusive)
{
ILLabel lblEx = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.EmitLdarg(TranslatedSub.StateArgIdx);
context.EmitLdint(op.Rn);
context.EmitPrivateCall(typeof(CpuThreadState), nameof(CpuThreadState.CheckExclusiveAddress));
context.Emit(OpCodes.Brtrue_S, lblEx);
//Address check failed, set error right away and do not store anything.
context.EmitLdc_I4(1);
context.EmitStintzr(op.Rs);
context.Emit(OpCodes.Br, lblEnd);
//Address check passsed.
context.MarkLabel(lblEx);
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdint(op.Rn);
context.EmitLdarg(TranslatedSub.StateArgIdx);
context.EmitCallPrivatePropGet(typeof(CpuThreadState), nameof(CpuThreadState.ExclusiveValueLow));
void EmitCast()
{
//The input should be always int64.
switch (op.Size)
{
case 0: context.Emit(OpCodes.Conv_U1); break;
case 1: context.Emit(OpCodes.Conv_U2); break;
case 2: context.Emit(OpCodes.Conv_U4); break;
}
}
EmitCast();
if (pair)
{
context.EmitLdarg(TranslatedSub.StateArgIdx);
context.EmitCallPrivatePropGet(typeof(CpuThreadState), nameof(CpuThreadState.ExclusiveValueHigh));
EmitCast();
context.EmitLdintzr(op.Rt);
EmitCast();
context.EmitLdintzr(op.Rt2);
EmitCast();
switch (op.Size)
{
case 2: context.EmitPrivateCall(typeof(MemoryManager), nameof(MemoryManager.AtomicCompareExchange2xInt32)); break;
case 3: context.EmitPrivateCall(typeof(MemoryManager), nameof(MemoryManager.AtomicCompareExchangeInt128)); break;
default: throw new InvalidOperationException($"Invalid store size of {1 << op.Size} bytes.");
}
}
else
{
context.EmitLdintzr(op.Rt);
EmitCast();
switch (op.Size)
{
case 0: context.EmitCall(typeof(MemoryManager), nameof(MemoryManager.AtomicCompareExchangeByte)); break;
case 1: context.EmitCall(typeof(MemoryManager), nameof(MemoryManager.AtomicCompareExchangeInt16)); break;
case 2: context.EmitCall(typeof(MemoryManager), nameof(MemoryManager.AtomicCompareExchangeInt32)); break;
case 3: context.EmitCall(typeof(MemoryManager), nameof(MemoryManager.AtomicCompareExchangeInt64)); break;
default: throw new InvalidOperationException($"Invalid store size of {1 << op.Size} bytes.");
}
}
//The value returned is a bool, true if the values compared
//were equal and the new value was written, false otherwise.
//We need to invert this result, as on ARM 1 indicates failure,
//and 0 success on those instructions.
context.EmitLdc_I4(1);
context.Emit(OpCodes.Xor);
context.Emit(OpCodes.Dup);
context.Emit(OpCodes.Conv_U8);
context.EmitStintzr(op.Rs);
//Only clear the exclusive monitor if the store was successful (Rs = false).
context.Emit(OpCodes.Brtrue_S, lblEnd);
Clrex(context);
context.MarkLabel(lblEnd);
}
else
{
void EmitWrite(int rt, long offset)
{
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdint(op.Rn);
if (offset != 0)
{
context.EmitLdc_I8(offset);
context.Emit(OpCodes.Add);
}
context.EmitLdintzr(rt);
EmitWriteCall(context, op.Size);
}
EmitWrite(op.Rt, 0);
if (pair)
{
EmitWrite(op.Rt2, 1 << op.Size);
}
}
}