rjx-mirror/ARMeilleure/Decoders/OpCode32.cs
merry bd9ac0fdaa
T32: Implement B, B.cond, BL, BLX (#3155)
* Decoders: Make IsThumb a function of OpCode32

* OpCode32: Fix GetPc

* T32: Implement B, B.cond, BL, BLX

* rm usings
2022-03-04 23:05:08 +01:00

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1.1 KiB
C#

namespace ARMeilleure.Decoders
{
class OpCode32 : OpCode
{
public Condition Cond { get; protected set; }
public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCode32(inst, address, opCode);
public OpCode32(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
{
RegisterSize = RegisterSize.Int32;
Cond = (Condition)((uint)opCode >> 28);
}
public bool IsThumb()
{
return this is OpCodeT16 || this is OpCodeT32;
}
public uint GetPc()
{
// Due to backwards compatibility and legacy behavior of ARMv4 CPUs pipeline,
// the PC actually points 2 instructions ahead.
if (IsThumb())
{
// PC is ahead by 4 in thumb mode whether or not the current instruction
// is 16 or 32 bit.
return (uint)Address + 4u;
}
else
{
return (uint)Address + 8u;
}
}
}
}