linux-kernel - RE: SDIV / UDIV Question

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Date:	Thu, 10 Oct 2013 13:04:41 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	'Will Deacon' <will.deacon@....com>
CC:	"'linux-arm-msm-owner@...r.kernel.org'" 
	<linux-arm-msm-owner@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: SDIV / UDIV  Question

Hi  Will ,


Oh ,  I see ,
Thanks for your clarification !
So R-class cores will not run linux ?
This means we don't  need  care about this .
Am I right ?

Thank you .

-----Original Message-----
From: Will Deacon [mailto:will.deacon@....com] 
Sent: Wednesday, October 09, 2013 6:54 PM
To: Wang, Yalin
Cc: 'linux-arm-msm-owner@...r.kernel.org'; linux-kernel@...r.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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