From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: Unwind bug on out of line code called from leaf functions
Date: Thu, 27 Nov 2003 00:32:00 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106989314023985@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106989195923088@msgid-missing>
>>>>> On Thu, 27 Nov 2003 11:12:18 +1100, Keith Owens <kaos@sgi.com> said:
Keith> I know that gcc 3.4 overcomes this problem by saving ar.pfs
Keith> in leaf functions and using br.call. However we need a fix
Keith> for gcc in the current distributions,
Sounds reasonable.
Keith> even with gcc 3.4 we may wish to use out of line code that
Keith> does not save ar.pfs in the future.
That would need a some solid argument!
Keith> We need a generic fix for unwinding through out of line code
Keith> called from leaf functions and not using br.call. The
Keith> obvious solution is to flag all out of line code with an
Keith> unwind abi field and have the common unwind code reset
Keith> ar.pfs. Can I use .unwabi 3, 'o' for out of line?
The .unwabi directive isn't appropriate for that. If you want such a
feature, please push it through the ABI committee to get it officially
supported. I've said that before, I think.
--david
next prev parent reply other threads:[~2003-11-27 0:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-27 0:12 Unwind bug on out of line code called from leaf functions Keith Owens
2003-11-27 0:32 ` David Mosberger [this message]
2003-11-27 1:12 ` Keith Owens
2003-11-27 1:34 ` David Mosberger
2003-11-27 4:28 ` David Mosberger
2003-11-27 6:52 ` Jim Wilson
2003-12-11 1:21 ` David Mosberger
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