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Date: Sun, 29 Jun 2008 14:13:34 +1000 (EST)
From: Bruce Evans <brde@optusnet.com.au>
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To: David Schultz <das@freebsd.org>
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Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org,
	Bruce Evans <brde@optusnet.com.au>
Subject: Re: cvs commit: src/lib/libc/i386/gen _setjmp.S setjmp.S
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On Sat, 28 Jun 2008, David Schultz wrote:

> On Sun, Jun 29, 2008, Bruce Evans wrote:
>> On Sat, 28 Jun 2008, David Schultz wrote:
>>> Don't clobber the FPU exception flags in longjmp.  C99 requires them
>>> to remain unchanged.
>>>
>>> ...but got cut off somehow.
>>
>> This is wrong.  It breaks longjmp() from all COMPAT_[3-4] signal
>> handlers (not just ones for SIGFPE).  I don't like the corresponding
>> change for amd64 either, and only approved it since amd64 doesn't
>> support COMPAT_[3-4] signal handlers.
>
> How is it possible for an application linked against an 8.X libc,
> and which is doing anything even remotely close to reasonable,
> to get COMPAT_3 or COMPAT_4 signal behavior?

Nevermind.  I forgot the layering.

Bruce