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SubjectRe: SDIV / UDIV Question
[Adding Jonny]

On Thu, Oct 10, 2013 at 06:04:41AM +0100, Wang, Yalin wrote:
> Oh , I see ,
> Thanks for your clarification !
> So R-class cores will not run linux ?

R-class cores can run Linux, but I don't reckon we touch SCTLR.DZ. I've
added Jonny, so he can clarify the behaviour here. (I'm also not sure which
cores have these instructions either).

Will

> -----Original Message-----
> From: Will Deacon [mailto:will.deacon@arm.com]
> Sent: Wednesday, October 09, 2013 6:54 PM
> To: Wang, Yalin
> Cc: 'linux-arm-msm-owner@vger.kernel.org'; linux-kernel@vger.kernel.org
> Subject: Re: SDIV / UDIV Question
>
> On Wed, Oct 09, 2013 at 08:08:05AM +0100, Wang, Yalin wrote:
> > I have a question about sdiv/ udiv instructions :
> > In armv7 A/R TRM, it said sdiv/udiv will cause Divide by zero as
> > undefined exception or just return zero (decided by implementation) .
> >
> > So in kernel , should we need register a undef hook to Get this
> > undef exception and send SIGFPE to user space Process ?
>
> As far as I can see, this can only happen for R-class cores, based on SCTLR.DZ.
>
> Will
>


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