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T32: Implement B, B.cond, BL, BLX (#3155)

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* Decoders: Make IsThumb a function of OpCode32

* OpCode32: Fix GetPc

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

* rm usings
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merry 2022-03-04 22:05:08 +00:00 • committed by GitHub
parent ac21abbb9d
commit bd9ac0fdaa
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8 changed files with 253 additions and 9 deletions
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16
ARMeilleure/Decoders/OpCode32.cs
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@ -13,11 +13,25 @@ namespace ARMeilleure.Decoders
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.
return (uint)Address + (uint)OpCodeSizeInBytes * 2;
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;
}
}
}
}