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43 lines
1.4 KiB
C#
43 lines
1.4 KiB
C#
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using ARMeilleure.Instructions;
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using ARMeilleure.State;
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using System;
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using System.Numerics;
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namespace ARMeilleure.Decoders
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{
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class OpCodeT16MemStack : OpCodeT16, IOpCode32MemMult
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{
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public int Rn => RegisterAlias.Aarch32Sp;
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public int RegisterMask { get; }
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public int PostOffset { get; }
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public bool IsLoad { get; }
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public int Offset { get; }
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public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCodeT16MemStack(inst, address, opCode);
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public OpCodeT16MemStack(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
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{
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int extra = (opCode >> 8) & 1;
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int regCount = BitOperations.PopCount((uint)opCode & 0x1ff);
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switch (inst.Name)
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{
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case InstName.Push:
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RegisterMask = (opCode & 0xff) | (extra << 14);
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IsLoad = false;
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Offset = -4 * regCount;
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PostOffset = -4 * regCount;
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break;
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case InstName.Pop:
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RegisterMask = (opCode & 0xff) | (extra << 15);
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IsLoad = true;
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Offset = 0;
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PostOffset = 4 * regCount;
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break;
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default:
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throw new InvalidOperationException();
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}
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}
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}
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}
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