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Re: [Qemu-devel] [RFC] alpha qemu arithmetic exceptions


From: Al Viro
Subject: Re: [Qemu-devel] [RFC] alpha qemu arithmetic exceptions
Date: Tue, 8 Jul 2014 07:54:36 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

On Mon, Jul 07, 2014 at 11:03:08PM -0700, Richard Henderson wrote:
> On 07/07/2014 09:20 PM, Al Viro wrote:
> > and I'm reasonably sure that this is what they did internally.  You are
> > proposing to do 4 cases in all their messy glory in qemu itself...
> 
> Yes.  Primarily because we *have* to do so for the linux-user case.
> 
> > And that's not even going into generating the right si_code for that SIGFPE.
> > What produces those TARGET_GEN_FLTINE and friends?
> 
> linux-user/main.c, cpu_loop.

That's where we consume it; where is it produced?  Sure, explicit
gentrap in alpha code will lead there, with whatever we have in
$16 deciding what'll go into si_code, but where does that happen on
fp exception codepaths?  IOW, what sets si_code on those?



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