diff options
Diffstat (limited to 'ARMeilleure/Decoders/OpCodeT16MemImm5.cs')
-rw-r--r-- | ARMeilleure/Decoders/OpCodeT16MemImm5.cs | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/ARMeilleure/Decoders/OpCodeT16MemImm5.cs b/ARMeilleure/Decoders/OpCodeT16MemImm5.cs new file mode 100644 index 00000000..20ef31e2 --- /dev/null +++ b/ARMeilleure/Decoders/OpCodeT16MemImm5.cs @@ -0,0 +1,58 @@ +using ARMeilleure.Instructions; +using System; + +namespace ARMeilleure.Decoders +{ + class OpCodeT16MemImm5 : OpCodeT16, IOpCode32Mem + { + public int Rt { get; } + public int Rn { get; } + + public bool WBack => false; + public bool IsLoad { get; } + public bool Index => true; + public bool Add => true; + + public int Immediate { get; } + + public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCodeT16MemImm5(inst, address, opCode); + + public OpCodeT16MemImm5(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode) + { + Rt = (opCode >> 0) & 7; + Rn = (opCode >> 3) & 7; + + switch (inst.Name) + { + case InstName.Ldr: + case InstName.Ldrb: + case InstName.Ldrh: + IsLoad = true; + break; + case InstName.Str: + case InstName.Strb: + case InstName.Strh: + IsLoad = false; + break; + } + + switch (inst.Name) + { + case InstName.Str: + case InstName.Ldr: + Immediate = ((opCode >> 6) & 0x1f) << 2; + break; + case InstName.Strb: + case InstName.Ldrb: + Immediate = ((opCode >> 6) & 0x1f); + break; + case InstName.Strh: + case InstName.Ldrh: + Immediate = ((opCode >> 6) & 0x1f) << 1; + break; + default: + throw new InvalidOperationException(); + } + } + } +} |