Date: Fri, 12 Nov 1999 09:32:16 -0700 From: Nate Williams <nate@mt.sri.com> To: Bruce Evans <bde@zeta.org.au> Cc: Nate Williams <nate@mt.sri.com>, Marcel Moolenaar <marcel@FreeBSD.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/include signal.h Message-ID: <199911121632.JAA19116@mt.sri.com> In-Reply-To: <Pine.BSF.4.10.9911130312430.18150-100000@alphplex.bde.org> References: <199911121549.IAA18836@mt.sri.com> <Pine.BSF.4.10.9911130312430.18150-100000@alphplex.bde.org>
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> > However, there are issues with sigset/longjmp with FPU state still,
> > although they might not be effected as I haven't looked at the
> > implementation yet.
>
> Our setjmp/longjmp already preserve too much FPU state C9x draft
> compatibility.
From the comments in the JDK source I added.
+ } else { \
+ /* \
+ * FreeBSD's siglongjmp resets the FPU with 'fninit', \
+ * so restore it. \
+ */ \
+ __asm__ ("frstor %0"::"m" (*fdata)); \
By reseting the FPU with fninit, we *lose* much of the state, we in our
code we must restore the state (which we stored before the call to
sigsetjmp with fsave/fwait).
Or, am I not understanding something critical here...
Nate
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