From: Keith Owens <kaos@ocs.com.au>
Cc: linux-ia64@vger.kernel.org, guile-devel@gnu.org
Subject: Re: Problem with Guile on ia64 (possibly "getcontext" related)
Date: Sun, 16 Jul 2006 12:54:51 +1000 [thread overview]
Message-ID: <16307.1153018491@ocs3.ocs.com.au> (raw)
In-Reply-To: Your message of "Sat, 15 Jul 2006 15:24:31 MST." <87ac7ajylc.fsf@raven.defaultvalue.org>
Rob Browning (on Sat, 15 Jul 2006 15:24:31 -0700) wrote:
>
>Guile 1.6.8 is crashing on ia64 with an illegal instruction whenever
>it tries to execute call-with-current-continuation. For those who
>don't know, call-with-current-continuation captures the current state
>of the computation; it's a language feature somewhat similar to
>setjmp.
>
>The crash seems to be right around an asm "getcontext" call, and after
>looking around, I found these two links:
>
> http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/144939
> http://lists.freebsd.org/pipermail/freebsd-sparc64/2006-January/003739.html
>
>They appear claim that adding a dummy (non-executed) setjmp just after
>the getcontext call will fix the problem because gcc recognizes
>setjmp, but not getcontext, and makes appropriate arrangements.
>
>So I tried adding a dummy setjmp just after the getcontext call, and
>that does fix the problem.
>
>However, even though this worked, I'd still prefer to have a better
>idea that this is the right fix before adopting it. Is that likely?
>>
>The relevant function is scm_make_continuation which you can find
>here:
>
> http://cvs.savannah.gnu.org/viewcvs/guile/guile-core/libguile/continuations.c?rev=1.38.2.7&root=guile&only_with_tag=branch_release-1-6&view=markup
Wild guess, based on no data. Add '__attribute__ ((returns_twice))' to
the definition of ia64_getcontext. That should remove the need to use
setjmp.
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next prev parent reply other threads:[~2006-07-16 2:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-15 22:24 Problem with Guile on ia64 (possibly "getcontext" related) Rob Browning
2006-07-16 2:54 ` Keith Owens [this message]
2006-07-19 1:40 ` Rob Browning
2006-07-19 2:11 ` Keith Owens
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