Re: [hatari-devel] CPU emulation issue in 68030 emulation? (movem.w (sp)

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: Andreas Grabher <andreas_g86@xxxxxxxxxx>
Date: Sat, 7 Sep 2024 20:50:58 +0200
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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.“

Follow-Ups:
- Re: [hatari-devel] CPU emulation issue in 68030 emulation? (movem.w (sp)+,Dn)
  - From: Uwe Seimet

References:
- [hatari-devel] CPU emulation issue in 68030 emulation? (movem.w (sp)+,Dn)
  - From: Uwe Seimet

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