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Re: [RESUME] fpu emulator

To: Jun Sun <jsun@mvista.com>
Subject: Re: [RESUME] fpu emulator
From: Andreas Jaeger <aj@suse.de>
Date: 09 Feb 2001 10:17:05 +0100
Cc: "Kevin D. Kissell" <kevink@mips.com>, Florian Lohoff <flo@rfc822.org>, linux-mips@oss.sgi.com
In-reply-to: <3A8304C0.D3CFFEF7@mvista.com> (Jun Sun's message of "Thu, 08 Feb 2001 12:42:40 -0800")
References: <20010208122030.A5408@paradigm.rfc822.org> <005d01c091c4$69940620$0deca8c0@Ulysses> <hor919tm4a.fsf@gee.suse.de> <3A8304C0.D3CFFEF7@mvista.com>
Sender: owner-linux-mips@oss.sgi.com
User-agent: Gnus/5.090001 (Oort Gnus v0.01) XEmacs/21.1 (Channel Islands)
Jun Sun <jsun@mvista.com> writes:

> Andreas Jaeger wrote:
> > 
>  
> > > saves/restores the FP registers in setjmp/longjmp, the
> > 
> > Any ideas how this can be done?
> > 
> > > model of "simply sending SIGILL/SIGFPE" will result
> > > in *all* processes being terminated with extreme prejudice,
> > > starting with init!
> > 
> 
> There is a patch for glibc2.0.7, which I think was done by Jay Carlson.  It
> basically works for glibc2.0.6 as well.  See the one for glibc2.0.6 attached
> below.
> 
> I think the patch is not "clean", in the sense that you only want to apply it
> if you want to configure with "--without-fp".  Otherwise the patch will break
> other configurations.
> 
> Jun--- glibc-2.0.6/sysdeps/mips/__longjmp.c.orig-rpm  Sat Sep 11 00:01:44 1999
> +++ glibc-2.0.6/sysdeps/mips/__longjmp.c      Sat Sep 11 00:02:36 1999
> @@ -35,6 +35,7 @@
>       along the way.  */
>    register int val asm ("a1");
>  
> +#ifdef __HAVE_FPU__

I looked through the whole of glibc and GCC and __HAVE_FPU__ is nowhere
defined for MIPS.  __HAVE_FPU__ is defined for m68k in GCC but that's
the only platform.

Therefore I don't think the patch makes any sense at all,
Andreas

-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de
    http://www.suse.de/~aj

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