lkml.org 
[lkml]   [2013]   [Oct]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRE: 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@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


\
 
 \ /
  Last update: 2013-10-10 07:21    [W:0.118 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site