Messages in this thread | | | From | "Wang, Yalin" <> | Date | Thu, 10 Oct 2013 13:04:41 +0800 | Subject | RE: SDIV / UDIV Question |
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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
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