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using ARMeilleure.Decoders;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.State;
using ARMeilleure.Translation;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.Instructions.InstEmitMemoryExHelper;
using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
namespace ARMeilleure.Instructions
{
static partial class InstEmit32
{
public static void Clrex(ArmEmitterContext context)
{
EmitClearExclusive(context);
}
public static void Csdb(ArmEmitterContext context)
{
// Execute as no-op.
}
public static void Dmb(ArmEmitterContext context) => EmitBarrier(context);
public static void Dsb(ArmEmitterContext context) => EmitBarrier(context);
public static void Ldrex(ArmEmitterContext context)
{
EmitExLoadOrStore(context, WordSizeLog2, AccessType.LoadZx | AccessType.Exclusive);
}
public static void Ldrexb(ArmEmitterContext context)
{
EmitExLoadOrStore(context, ByteSizeLog2, AccessType.LoadZx | AccessType.Exclusive);
}
public static void Ldrexd(ArmEmitterContext context)
{
EmitExLoadOrStore(context, DWordSizeLog2, AccessType.LoadZx | AccessType.Exclusive);
}
public static void Ldrexh(ArmEmitterContext context)
{
EmitExLoadOrStore(context, HWordSizeLog2, AccessType.LoadZx | AccessType.Exclusive);
}
public static void Lda(ArmEmitterContext context)
{
EmitExLoadOrStore(context, WordSizeLog2, AccessType.LoadZx | AccessType.Ordered);
}
public static void Ldab(ArmEmitterContext context)
{
EmitExLoadOrStore(context, ByteSizeLog2, AccessType.LoadZx | AccessType.Ordered);
}
public static void Ldaex(ArmEmitterContext context)
{
EmitExLoadOrStore(context, WordSizeLog2, AccessType.LoadZx | AccessType.Exclusive | AccessType.Ordered);
}
public static void Ldaexb(ArmEmitterContext context)
{
EmitExLoadOrStore(context, ByteSizeLog2, AccessType.LoadZx | AccessType.Exclusive | AccessType.Ordered);
}
public static void Ldaexd(ArmEmitterContext context)
{
EmitExLoadOrStore(context, DWordSizeLog2, AccessType.LoadZx | AccessType.Exclusive | AccessType.Ordered);
}
public static void Ldaexh(ArmEmitterContext context)
{
EmitExLoadOrStore(context, HWordSizeLog2, AccessType.LoadZx | AccessType.Exclusive | AccessType.Ordered);
}
public static void Ldah(ArmEmitterContext context)
{
EmitExLoadOrStore(context, HWordSizeLog2, AccessType.LoadZx | AccessType.Ordered);
}
// Stores.
public static void Strex(ArmEmitterContext context)
{
EmitExLoadOrStore(context, WordSizeLog2, AccessType.Store | AccessType.Exclusive);
}
public static void Strexb(ArmEmitterContext context)
{
EmitExLoadOrStore(context, ByteSizeLog2, AccessType.Store | AccessType.Exclusive);
}
public static void Strexd(ArmEmitterContext context)
{
EmitExLoadOrStore(context, DWordSizeLog2, AccessType.Store | AccessType.Exclusive);
}
public static void Strexh(ArmEmitterContext context)
{
EmitExLoadOrStore(context, HWordSizeLog2, AccessType.Store | AccessType.Exclusive);
}
public static void Stl(ArmEmitterContext context)
{
EmitExLoadOrStore(context, WordSizeLog2, AccessType.Store | AccessType.Ordered);
}
public static void Stlb(ArmEmitterContext context)
{
EmitExLoadOrStore(context, ByteSizeLog2, AccessType.Store | AccessType.Ordered);
}
public static void Stlex(ArmEmitterContext context)
{
EmitExLoadOrStore(context, WordSizeLog2, AccessType.Store | AccessType.Exclusive | AccessType.Ordered);
}
public static void Stlexb(ArmEmitterContext context)
{
EmitExLoadOrStore(context, ByteSizeLog2, AccessType.Store | AccessType.Exclusive | AccessType.Ordered);
}
public static void Stlexd(ArmEmitterContext context)
{
EmitExLoadOrStore(context, DWordSizeLog2, AccessType.Store | AccessType.Exclusive | AccessType.Ordered);
}
public static void Stlexh(ArmEmitterContext context)
{
EmitExLoadOrStore(context, HWordSizeLog2, AccessType.Store | AccessType.Exclusive | AccessType.Ordered);
}
public static void Stlh(ArmEmitterContext context)
{
EmitExLoadOrStore(context, HWordSizeLog2, AccessType.Store | AccessType.Ordered);
}
private static void EmitExLoadOrStore(ArmEmitterContext context, int size, AccessType accType)
{
IOpCode32MemEx op = (IOpCode32MemEx)context.CurrOp;
Operand address = context.Copy(GetIntA32(context, op.Rn));
var exclusive = (accType & AccessType.Exclusive) != 0;
var ordered = (accType & AccessType.Ordered) != 0;
if ((accType & AccessType.Load) != 0)
{
if (ordered)
{
EmitBarrier(context);
}
if (size == DWordSizeLog2)
{
// Keep loads atomic - make the call to get the whole region and then decompose it into parts
// for the registers.
Operand value = EmitLoadExclusive(context, address, exclusive, size);
Operand valueLow = context.ConvertI64ToI32(value);
valueLow = context.ZeroExtend32(OperandType.I64, valueLow);
Operand valueHigh = context.ShiftRightUI(value, Const(32));
Operand lblBigEndian = Label();
Operand lblEnd = Label();
context.BranchIfTrue(lblBigEndian, GetFlag(PState.EFlag));
SetIntA32(context, op.Rt, valueLow);
SetIntA32(context, op.Rt2, valueHigh);
context.Branch(lblEnd);
context.MarkLabel(lblBigEndian);
SetIntA32(context, op.Rt2, valueLow);
SetIntA32(context, op.Rt, valueHigh);
context.MarkLabel(lblEnd);
}
else
{
SetIntA32(context, op.Rt, EmitLoadExclusive(context, address, exclusive, size));
}
}
else
{
if (size == DWordSizeLog2)
{
// Split the result into 2 words (based on endianness)
Operand lo = context.ZeroExtend32(OperandType.I64, GetIntA32(context, op.Rt));
Operand hi = context.ZeroExtend32(OperandType.I64, GetIntA32(context, op.Rt2));
Operand lblBigEndian = Label();
Operand lblEnd = Label();
context.BranchIfTrue(lblBigEndian, GetFlag(PState.EFlag));
Operand leResult = context.BitwiseOr(lo, context.ShiftLeft(hi, Const(32)));
EmitStoreExclusive(context, address, leResult, exclusive, size, op.Rd, a32: true);
context.Branch(lblEnd);
context.MarkLabel(lblBigEndian);
Operand beResult = context.BitwiseOr(hi, context.ShiftLeft(lo, Const(32)));
EmitStoreExclusive(context, address, beResult, exclusive, size, op.Rd, a32: true);
context.MarkLabel(lblEnd);
}
else
{
Operand value = context.ZeroExtend32(OperandType.I64, GetIntA32(context, op.Rt));
EmitStoreExclusive(context, address, value, exclusive, size, op.Rd, a32: true);
}
if (ordered)
{
EmitBarrier(context);
}
}
}
private static void EmitBarrier(ArmEmitterContext 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.
}
}
}
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