diff options
| author | TSR Berry <20988865+TSRBerry@users.noreply.github.com> | 2023-04-08 01:22:00 +0200 |
|---|---|---|
| committer | Mary <thog@protonmail.com> | 2023-04-27 23:51:14 +0200 |
| commit | cee712105850ac3385cd0091a923438167433f9f (patch) | |
| tree | 4a5274b21d8b7f938c0d0ce18736d3f2993b11b1 /src/ARMeilleure/Decoders/OpCodeT16MemStack.cs | |
| parent | cd124bda587ef09668a971fa1cac1c3f0cfc9f21 (diff) | |
Move solution and projects to src
Diffstat (limited to 'src/ARMeilleure/Decoders/OpCodeT16MemStack.cs')
| -rw-r--r-- | src/ARMeilleure/Decoders/OpCodeT16MemStack.cs | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/ARMeilleure/Decoders/OpCodeT16MemStack.cs b/src/ARMeilleure/Decoders/OpCodeT16MemStack.cs new file mode 100644 index 00000000..9d7b0d20 --- /dev/null +++ b/src/ARMeilleure/Decoders/OpCodeT16MemStack.cs @@ -0,0 +1,42 @@ +using ARMeilleure.Instructions; +using ARMeilleure.State; +using System; +using System.Numerics; + +namespace ARMeilleure.Decoders +{ + class OpCodeT16MemStack : OpCodeT16, IOpCode32MemMult + { + public int Rn => RegisterAlias.Aarch32Sp; + 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) => new OpCodeT16MemStack(inst, address, opCode); + + public OpCodeT16MemStack(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode) + { + int extra = (opCode >> 8) & 1; + int regCount = BitOperations.PopCount((uint)opCode & 0x1ff); + + switch (inst.Name) + { + case InstName.Push: + RegisterMask = (opCode & 0xff) | (extra << 14); + IsLoad = false; + Offset = -4 * regCount; + PostOffset = -4 * regCount; + break; + case InstName.Pop: + RegisterMask = (opCode & 0xff) | (extra << 15); + IsLoad = true; + Offset = 0; + PostOffset = 4 * regCount; + break; + default: + throw new InvalidOperationException(); + } + } + } +} |