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From: "Michael S. Zick" <mszick@morethan.org>
To: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] Does it lakes some cloberred r1 in
Date: Thu, 20 Apr 2006 12:36:37 -0500	[thread overview]
Message-ID: <200604201236.37925.mszick@morethan.org> (raw)
In-Reply-To: <200604201728.k3KHSH7W022804@hiauly1.hia.nrc.ca>

On Thu April 20 2006 12:28, John David Anglin wrote:
> > > (here) insn, an interruption occures which in turn launch the
> > > fixup_put_user_skip_1()
> > 
> > A couple more questions for research :)
> > 
> > Q: Does the process of interruption clobber registers?
> 
Joel,

The machine should switch a small sub-set of the general
registers to an alternate set, called the 'shadow registers'
for the interruption routine to use.

I do not recall the exact list of which register numbers
those are.  Search for 'shadow registers' in the acd.pdf

I do not know if r1 is shadowed or not.

If the interrupt routine needs to use other registers,
then it must save/restore them in that routine.

Mike
> r8 and r9?
> 
> Dave
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  reply	other threads:[~2006-04-20 17:36 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <IY13E1$80C55BA8C044E2D421CA2D8B24C31D6A@scarlet.be>
2006-04-20 17:09 ` [parisc-linux] Does it lakes some cloberred r1 in __put_kernel_asm() 64bit? Carlos O'Donell
2006-04-20 17:28   ` [parisc-linux] Does it lakes some cloberred r1 in John David Anglin
2006-04-20 17:36     ` Michael S. Zick [this message]
2006-04-20 19:32       ` John David Anglin
2006-04-20 20:21         ` Michael S. Zick
2006-04-20 20:04     ` Carlos O'Donell
2006-04-20 21:29       ` John David Anglin
2006-04-21 18:52       ` Michael S. Zick
     [not found] <200604212013.k3LKDAbx003500@hiauly1.hia.nrc.ca>
2006-04-21 20:30 ` John David Anglin
     [not found] <20060422154641.GC10514@quicksilver.road.mcmartin.ca>
2006-04-22 16:48 ` John David Anglin
2006-04-23 16:18   ` Michael S. Zick
2006-04-23 17:06     ` Michael S. Zick
2006-04-24 15:35       ` John David Anglin
2006-04-24 16:25         ` Grant Grundler
2006-04-24 16:50           ` John David Anglin
2006-04-24 18:55             ` John David Anglin
2006-04-25  0:38             ` Grant Grundler
2006-04-26 16:42             ` Michael S. Zick
2006-04-24 16:35         ` Michael S. Zick
2006-04-24 18:00           ` Michael S. Zick
2006-04-24 19:15             ` John David Anglin
2006-04-24 21:57             ` Michael S. Zick
2006-04-24 22:40               ` John David Anglin
2006-04-24 18:46           ` John David Anglin
2006-04-24 19:12             ` Michael S. Zick
2006-04-24 21:07               ` John David Anglin
2006-04-25 15:17         ` Michael S. Zick
2006-04-25 18:52           ` Michael S. Zick
2006-04-25 21:42             ` John David Anglin

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