------- 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
