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T16: Implement LDM, STM

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merry 2022-02-11 21:23:08 +00:00
parent 108a6886f9
commit 9c16e8695b
2 changed files with 43 additions and 0 deletions
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41
ARMeilleure/Decoders/OpCodeT16MemMult.cs Normal file
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@ -0,0 +1,41 @@
using ARMeilleure.Instructions;
using System;
using System.Numerics;
namespace ARMeilleure.Decoders
{
class OpCodeT16MemMult : OpCodeT16, IOpCode32MemMult
{
public int Rn { get; }
public int RegisterMask { get; }
public int PostOffset { get; }
public bool IsLoad { get; }
public int Offset { get; }
public new static OpCode Create(InstDescriptor inst, ulong address, int opCode, bool inITBlock) => new OpCodeT16MemMult(inst, address, opCode, inITBlock);
public OpCodeT16MemMult(InstDescriptor inst, ulong address, int opCode, bool inITBlock) : base(inst, address, opCode, inITBlock)
{
RegisterMask = opCode & 0xff;
Rn = (opCode >> 8) & 7;
int regCount = BitOperations.PopCount((uint)RegisterMask);
switch (inst.Name)
{
case InstName.Stm:
IsLoad = false;
Offset = 0;
PostOffset = 4 * regCount;
break;
case InstName.Ldm:
IsLoad = true;
Offset = 0;
PostOffset = 4 * regCount;
break;
default:
throw new InvalidOperationException();
}
}
}
}

2
ARMeilleure/Decoders/OpCodeTable.cs
View file

@ -1037,6 +1037,8 @@ namespace ARMeilleure.Decoders
SetT16("101110x1xxxxxxxx", InstName.Cbnz, InstEmit32.Cbnz, OpCodeT16BImmCmp.Create);
SetT16("1011110xxxxxxxxx", InstName.Pop, InstEmit32.Ldm, OpCodeT16MemStack.Create);
SetT16("10111111xxxx0000", InstName.Nop, InstEmit32.Nop, OpCodeT16.Create);
SetT16("11000xxxxxxxxxxx", InstName.Stm, InstEmit32.Stm, OpCodeT16MemMult.Create);
SetT16("11001xxxxxxxxxxx", InstName.Ldm, InstEmit32.Ldm, OpCodeT16MemMult.Create);
#endregion
FillFastLookupTable(InstA32FastLookup, AllInstA32, ToFastLookupIndexA);