[Adding Jonny] On Thu, Oct 10, 2013 at 06:04:41AM +0100, Wang, Yalin wrote: > Oh , I see , > Thanks for your clarification ! > So R-class cores will not run linux ?
R-class cores can run Linux, but I don't reckon we touch SCTLR.DZ. I've added Jonny, so he can clarify the behaviour here. (I'm also not sure which cores have these instructions either). Will > -----Original Message----- > From: Will Deacon [mailto:[email protected]] > Sent: Wednesday, October 09, 2013 6:54 PM > To: Wang, Yalin > Cc: '[email protected]'; [email protected] > 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
