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using ChocolArm64.Decoders;
using ChocolArm64.Memory;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System;
using System.Reflection.Emit;
using System.Threading;
using static ChocolArm64.Instructions.InstEmitMemoryHelper;
namespace ChocolArm64.Instructions
{
static partial class InstEmit
{
[Flags]
private enum AccessType
{
None = 0,
Ordered = 1,
Exclusive = 2,
OrderedEx = Ordered | Exclusive
}
public static void Clrex(ILEmitterCtx context)
{
EmitMemoryCall(context, nameof(MemoryManager.ClearExclusive));
}
public static void Dmb(ILEmitterCtx context) => EmitBarrier(context);
public static void Dsb(ILEmitterCtx context) => EmitBarrier(context);
public static void Ldar(ILEmitterCtx context) => EmitLdr(context, AccessType.Ordered);
public static void Ldaxr(ILEmitterCtx context) => EmitLdr(context, AccessType.OrderedEx);
public static void Ldxr(ILEmitterCtx context) => EmitLdr(context, AccessType.Exclusive);
public static void Ldxp(ILEmitterCtx context) => EmitLdp(context, AccessType.Exclusive);
public static void Ldaxp(ILEmitterCtx context) => EmitLdp(context, AccessType.OrderedEx);
private static void EmitLdr(ILEmitterCtx context, AccessType accType)
{
EmitLoad(context, accType, false);
}
private static void EmitLdp(ILEmitterCtx context, AccessType accType)
{
EmitLoad(context, accType, true);
}
private static void EmitLoad(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)
{
EmitMemoryCall(context, nameof(MemoryManager.SetExclusive), op.Rn);
}
context.EmitLdint(op.Rn);
context.EmitSttmp();
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdtmp();
EmitReadZxCall(context, op.Size);
context.EmitStintzr(op.Rt);
if (pair)
{
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdtmp();
context.EmitLdc_I8(1 << op.Size);
context.Emit(OpCodes.Add);
EmitReadZxCall(context, op.Size);
context.EmitStintzr(op.Rt2);
}
}
public static void Pfrm(ILEmitterCtx context)
{
//Memory Prefetch, execute as no-op.
}
public static void Stlr(ILEmitterCtx context) => EmitStr(context, AccessType.Ordered);
public static void Stlxr(ILEmitterCtx context) => EmitStr(context, AccessType.OrderedEx);
public static void Stxr(ILEmitterCtx context) => EmitStr(context, AccessType.Exclusive);
public static void Stxp(ILEmitterCtx context) => EmitStp(context, AccessType.Exclusive);
public static void Stlxp(ILEmitterCtx context) => EmitStp(context, AccessType.OrderedEx);
private static void EmitStr(ILEmitterCtx context, AccessType accType)
{
EmitStore(context, accType, false);
}
private static void EmitStp(ILEmitterCtx context, AccessType accType)
{
EmitStore(context, accType, true);
}
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);
}
ILLabel lblEx = new ILLabel();
ILLabel lblEnd = new ILLabel();
if (exclusive)
{
EmitMemoryCall(context, nameof(MemoryManager.TestExclusive), op.Rn);
context.Emit(OpCodes.Brtrue_S, lblEx);
context.EmitLdc_I8(1);
context.EmitStintzr(op.Rs);
context.Emit(OpCodes.Br_S, lblEnd);
}
context.MarkLabel(lblEx);
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdint(op.Rn);
context.EmitLdintzr(op.Rt);
EmitWriteCall(context, op.Size);
if (pair)
{
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdint(op.Rn);
context.EmitLdc_I8(1 << op.Size);
context.Emit(OpCodes.Add);
context.EmitLdintzr(op.Rt2);
EmitWriteCall(context, op.Size);
}
if (exclusive)
{
context.EmitLdc_I8(0);
context.EmitStintzr(op.Rs);
EmitMemoryCall(context, nameof(MemoryManager.ClearExclusiveForStore));
}
context.MarkLabel(lblEnd);
}
private static void EmitMemoryCall(ILEmitterCtx context, string name, int rn = -1)
{
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdarg(TranslatedSub.StateArgIdx);
context.EmitCallPropGet(typeof(CpuThreadState), nameof(CpuThreadState.Core));
if (rn != -1)
{
context.EmitLdint(rn);
}
context.EmitCall(typeof(MemoryManager), name);
}
private static void EmitBarrier(ILEmitterCtx context)
{
//Note: This barrier is most likely not necessary, and probably
//doesn't make any difference since we need to do a ton of stuff
//(software MMU emulation) to read or write anything anyway.
context.EmitCall(typeof(Thread), nameof(Thread.MemoryBarrier));
}
}
}
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