Re: ctxsw routine for M68000

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Article #100

#100

From: Serge Rouveyrol
Date: Fri, 09 Oct 1992 07:27

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In article <1992Oct2.195944.772@nntpd2.cxo.dec.com> kgibsonkgibson@cxcad%decwrl.dec.com (Ken Gibson) writes:
>
>  Can someone post an M68000 version of the assembly language context switch
>routine _ctxsw for Xinu?  
>
>Many Thanks

*
*   ctxsw(OldSp,NewSp)
*   int *OldSp, *NewSp;
*
NBREGS  EQU     15
ADRRET  EQU     15*4
OLDSP   EQU     ADRRET+4
NEWSP   EQU     OLDSP+4

        xdef    _ctxsw
_ctxsw:
*
*   sauvegarde des registres du processus courant dans sa pile
*
        movem.l d0-a6,-(a7)
*
*   l'instant magique (eucharistique meme) : on fait l'echange des piles
*
        move.l  OLDSP(a7),a0
        move.l  sp,(a0)

        move.l  NEWSP(a7),a0
        move.l  (a0),a7
*
*   rechargement des registres du nouveau processus a partir de sa pile
*
        movem.l (a7)+,a6-d0
*
*   bye!
*
        rts

-- 
serge@imag.fr

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Message-ID: <41383@imag.imag.fr>

Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!corton!babbage!imag!serge

References: <1992Oct2.195944.772@nntpd2.cxo.dec.com>

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!corton!babbage!imag!serge
From: serge@imag.fr (Serge Rouveyrol)
Newsgroups: comp.os.xinu
Subject: Re: ctxsw routine for M68000
Message-ID: <41383@imag.imag.fr>
Date: 9 Oct 92 07:27:42 GMT
References: <1992Oct2.195944.772@nntpd2.cxo.dec.com>
Organization: IMAG Institute, University of Grenoble, France
Lines: 41

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