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From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/44290] [4.5 Regression] arm linux kernel crahes when built with -fipa-sra, __naked attribute is broken
Date: Sat, 29 May 2010 11:43:00 -0000 [thread overview]
Message-ID: <20100529114300.25876.qmail@sourceware.org> (raw)
In-Reply-To: <bug-44290-10179@http.gcc.gnu.org/bugzilla/>
------- Comment #9 from rguenth at gcc dot gnu dot org 2010-05-29 11:42 -------
(In reply to comment #8)
> (In reply to comment #6)
> > I note that copypage-xscale.c:xscale_mc_copy_user_highpage() calls a __naked
> > function to do the bulk copy. Converting that to a plain inline function
> > (changing 'pc' to 'lr' in the final instruction that restores the scrach regs),
> > does not prevent the crash. So I suspect a plain C code miscompilation.
>
> Actually that conversion away from __naked may have been flawed. What I'm
> seeing is that r148981 causes gcc to clone the __naked function and change its
> calling conventions in ways that don't match the proper function call ABI.
> This breaks the body of the __naked function which is just a big asm()
> statement.
Well. The arm backend needs to mark the function as "used in non-visible
ways" then. Thus this is a target bug.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|tree-optimization |target
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2010-05-29 11:42:59
date| |
Summary|[4.5 Regression] arm linux |[4.5 Regression] arm linux
|kernel crahes when built |kernel crahes when built
|with -fipa-sra |with -fipa-sra, __naked
| |attribute is broken
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
next prev parent reply other threads:[~2010-05-29 11:43 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
2010-05-27 7:07 ` [Bug tree-optimization/44290] " raj dot khem at gmail dot com
2010-05-27 7:13 ` raj dot khem at gmail dot com
2010-05-27 10:41 ` [Bug tree-optimization/44290] [4.5 Regression] " rguenth at gcc dot gnu dot org
2010-05-27 17:26 ` raj dot khem at gmail dot com
2010-05-27 17:27 ` raj dot khem at gmail dot com
2010-05-28 11:49 ` mikpe at it dot uu dot se
2010-05-28 22:03 ` mikpe at it dot uu dot se
2010-05-29 11:36 ` mikpe at it dot uu dot se
2010-05-29 11:43 ` rguenth at gcc dot gnu dot org [this message]
2010-05-29 11:47 ` [Bug target/44290] [4.5 Regression] arm linux kernel crahes when built with -fipa-sra, __naked attribute is broken rguenth at gcc dot gnu dot org
2010-05-29 11:50 ` rguenth at gcc dot gnu dot org
2010-05-29 13:30 ` Andrew Pinski
2010-05-29 13:30 ` pinskia at gmail dot com
2010-05-29 14:27 ` mikpe at it dot uu dot se
2010-05-29 14:40 ` mikpe at it dot uu dot se
2010-05-29 14:45 ` [Bug target/44290] [4.5 Regression] " rguenth at gcc dot gnu dot org
2010-05-29 14:46 ` rguenth at gcc dot gnu dot org
2010-05-29 14:47 ` mikpe at it dot uu dot se
2010-05-29 18:00 ` mikpe at it dot uu dot se
2010-05-30 5:58 ` raj dot khem at gmail dot com
2010-05-30 6:55 ` raj dot khem at gmail dot com
2010-05-30 17:04 ` rguenth at gcc dot gnu dot org
2010-07-23 14:48 ` jiez at gcc dot gnu dot org
2010-07-23 14:51 ` jiez at gcc dot gnu dot org
2010-07-23 14:52 ` jiez at gcc dot gnu dot org
2010-07-26 8:05 ` [Bug target/44290] [4.5 only] " ramana at gcc dot gnu dot org
2010-07-26 14:38 ` jiez at gcc dot gnu dot org
2010-07-27 17:34 ` jiez at gcc dot gnu dot org
2010-07-31 9:35 ` rguenth at gcc dot gnu dot org
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