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using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.State;
using ARMeilleure.Translation;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
namespace ARMeilleure.Instructions
{
static class InstEmitMemoryExHelper
{
private const int ErgSizeLog2 = 4;
public static Operand EmitLoadExclusive(ArmEmitterContext context, Operand address, bool exclusive, int size)
{
if (exclusive)
{
Operand value;
if (size == 4)
{
// Only 128-bit CAS is guaranteed to have a atomic load.
Operand physAddr = InstEmitMemoryHelper.EmitPtPointerLoad(context, address, default, write: false, 4);
Operand zero = context.VectorZero();
value = context.CompareAndSwap(physAddr, zero, zero);
}
else
{
value = InstEmitMemoryHelper.EmitReadIntAligned(context, address, size);
}
Operand arg0 = context.LoadArgument(OperandType.I64, 0);
Operand exAddrPtr = context.Add(arg0, Const((long)NativeContext.GetExclusiveAddressOffset()));
Operand exValuePtr = context.Add(arg0, Const((long)NativeContext.GetExclusiveValueOffset()));
context.Store(exAddrPtr, context.BitwiseAnd(address, Const(address.Type, GetExclusiveAddressMask())));
// Make sure the unused higher bits of the value are cleared.
if (size < 3)
{
context.Store(exValuePtr, Const(0UL));
}
if (size < 4)
{
context.Store(context.Add(exValuePtr, Const(exValuePtr.Type, 8L)), Const(0UL));
}
// Store the new exclusive value.
context.Store(exValuePtr, value);
return value;
}
else
{
return InstEmitMemoryHelper.EmitReadIntAligned(context, address, size);
}
}
public static void EmitStoreExclusive(
ArmEmitterContext context,
Operand address,
Operand value,
bool exclusive,
int size,
int rs,
bool a32)
{
if (size < 3)
{
value = context.ConvertI64ToI32(value);
}
if (exclusive)
{
// We overwrite one of the register (Rs),
// keep a copy of the values to ensure we are working with the correct values.
address = context.Copy(address);
value = context.Copy(value);
void SetRs(Operand value)
{
if (a32)
{
SetIntA32(context, rs, value);
}
else
{
SetIntOrZR(context, rs, value);
}
}
Operand arg0 = context.LoadArgument(OperandType.I64, 0);
Operand exAddrPtr = context.Add(arg0, Const((long)NativeContext.GetExclusiveAddressOffset()));
Operand exAddr = context.Load(address.Type, exAddrPtr);
// STEP 1: Check if we have exclusive access to this memory region. If not, fail and skip store.
Operand maskedAddress = context.BitwiseAnd(address, Const(address.Type, GetExclusiveAddressMask()));
Operand exFailed = context.ICompareNotEqual(exAddr, maskedAddress);
Operand lblExit = Label();
SetRs(Const(1));
context.BranchIfTrue(lblExit, exFailed);
// STEP 2: We have exclusive access and the address is valid, attempt the store using CAS.
Operand physAddr = InstEmitMemoryHelper.EmitPtPointerLoad(context, address, default, write: true, size);
Operand exValuePtr = context.Add(arg0, Const((long)NativeContext.GetExclusiveValueOffset()));
Operand exValue = size switch
{
0 => context.Load8(exValuePtr),
1 => context.Load16(exValuePtr),
2 => context.Load(OperandType.I32, exValuePtr),
3 => context.Load(OperandType.I64, exValuePtr),
_ => context.Load(OperandType.V128, exValuePtr),
};
Operand currValue = size switch
{
0 => context.CompareAndSwap8(physAddr, exValue, value),
1 => context.CompareAndSwap16(physAddr, exValue, value),
_ => context.CompareAndSwap(physAddr, exValue, value),
};
// STEP 3: Check if we succeeded by comparing expected and in-memory values.
Operand storeFailed;
if (size == 4)
{
Operand currValueLow = context.VectorExtract(OperandType.I64, currValue, 0);
Operand currValueHigh = context.VectorExtract(OperandType.I64, currValue, 1);
Operand exValueLow = context.VectorExtract(OperandType.I64, exValue, 0);
Operand exValueHigh = context.VectorExtract(OperandType.I64, exValue, 1);
storeFailed = context.BitwiseOr(
context.ICompareNotEqual(currValueLow, exValueLow),
context.ICompareNotEqual(currValueHigh, exValueHigh));
}
else
{
storeFailed = context.ICompareNotEqual(currValue, exValue);
}
SetRs(storeFailed);
context.MarkLabel(lblExit);
}
else
{
InstEmitMemoryHelper.EmitWriteIntAligned(context, address, value, size);
}
}
public static void EmitClearExclusive(ArmEmitterContext context)
{
Operand arg0 = context.LoadArgument(OperandType.I64, 0);
Operand exAddrPtr = context.Add(arg0, Const((long)NativeContext.GetExclusiveAddressOffset()));
// We store ULONG max to force any exclusive address checks to fail,
// since this value is not aligned to the ERG mask.
context.Store(exAddrPtr, Const(ulong.MaxValue));
}
private static long GetExclusiveAddressMask() => ~((4L << ErgSizeLog2) - 1);
}
}
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