Re: SDIV / UDIV Question

[Will Deacon]

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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