From owner-freebsd-arch  Wed Jan  9 19:17:26 2002
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Date: Thu, 10 Jan 2002 14:17:43 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Nate Williams <nate@yogotech.com>
Cc: Daniel Eischen <eischen@pcnet1.pcnet.com>,
	Dan Eischen <eischen@vigrid.com>, Peter Wemm <peter@wemm.org>,
	Archie Cobbs <archie@dellroad.org>, Alfred Perlstein <bright@mu.org>,
	<arch@FreeBSD.ORG>
Subject: Re: Request for review: getcontext, setcontext, etc
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> > > Assuming I used followed things up with 'fnsave', will the exception be
> > > triggered by a frstor, and thus the exception will be correctly reported
> > > by the thread triggering the exception?
> >
> > Only on broken systems.
>
> Why is reporting a SIGFPE considered broken?  This is a valid exception,
> and it should be reported.

Because the SIGFPE is for the broken context-switching code and not for
the program.

> > See Appendix C of the Intel MMX manual (1997 version at least) for more
> > details.
>
> I don't have the MXX manual, just the x86/87 programming manuals for x86
> (X <= 3).

Same here, except I also have the 486 manual and a web browser :-).

Bruce


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