From: Will Deacon <will.deacon@arm.com>
To: "Wang, Yalin" <Yalin.Wang@sonymobile.com>
Cc: "'linux-arm-msm-owner@vger.kernel.org'"
<linux-arm-msm-owner@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: SDIV / UDIV Question
Date: Wed, 9 Oct 2013 11:53:57 +0100 [thread overview]
Message-ID: <20131009105357.GC6564@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <35FD53F367049845BC99AC72306C23D1014D1A0971AC@CNBJMBX05.corpusers.net>
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
next prev parent reply other threads:[~2013-10-09 10:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-09 7:08 Wang, Yalin
2013-10-09 10:53 ` Will Deacon [this message]
2013-10-10 5:04 ` Wang, Yalin
2013-10-10 9:21 ` Will Deacon
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