src/ARMeilleure/Decoders/OpCode32Mem.cs


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using ARMeilleure.Instructions;

namespace ARMeilleure.Decoders
{
    class OpCode32Mem : OpCode32, IOpCode32Mem
    {
        public int Rt { get; protected set; }
        public int Rn { get; }

        public int Immediate { get; protected set; }

        public bool Index { get; }
        public bool Add { get; }
        public bool WBack { get; }
        public bool Unprivileged { get; }

        public bool IsLoad { get; }

        public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCode32Mem(inst, address, opCode);

        public OpCode32Mem(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
        {
            Rt = (opCode >> 12) & 0xf;
            Rn = (opCode >> 16) & 0xf;

            bool isLoad = (opCode & (1 << 20)) != 0;
            bool w = (opCode & (1 << 21)) != 0;
            bool u = (opCode & (1 << 23)) != 0;
            bool p = (opCode & (1 << 24)) != 0;

            Index = p;
            Add = u;
            WBack = !p || w;
            Unprivileged = !p && w;

            IsLoad = isLoad || inst.Name == InstName.Ldrd;
        }
    }
}