| Re: [hatari-devel] CPU emulation issue in 68030 emulation? (movem.w (sp)+,Dn) |
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- Subject: Re: [hatari-devel] CPU emulation issue in 68030 emulation? (movem.w (sp)+,Dn)
- From: Uwe Seimet <Uwe.Seimet@xxxxxxxxx>
- Date: Sat, 7 Sep 2024 20:52:55 +0200
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Thank you for checking this.
>
> > Am 07.09.2024 um 19:54 schrieb Uwe Seimet <Uwe.Seimet@xxxxxxxxx>:
> >
> > Hi,
> >
> > I just stumbled upon this in the 68030 emulation:
> >
> > moveq #0,d0
> > move #$ffff,-(sp)
> > movem.w (sp)+,d0
> >
> > D0 now is $ffffffff, but it should be $0000ffff, shouldn't it? For an
> > address register $ffffffff would be correct, but not for a data register.
> > Or am I missing something?
> >
> > Best regards
> >
> > Uwe
> >
>
> I think it is correct. See https://68k.hax.com/MOVEM:
>
> „In the case of a word transfer to either address or data registers, each word is sign extended to 32 bits, and the resulting long word is loaded into the associated register.“