linux-kernel - Re: Memory corruption due to word sharing

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Message-ID: <1328123041.4764.20.camel@otta>
Date:	Wed, 01 Feb 2012 13:04:01 -0600
From:	Peter Bergner <bergner@...t.ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	matz@...e.de, jkosina@...e.cz, torvalds@...ux-foundation.org,
	walters@...bum.org, jack@...e.cz, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, dsterba@...e.cz, ptesarik@...e.cz,
	rguenther@...e.de, gcc@....gnu.org
Subject: Re: Memory corruption due to word sharing

On Wed, 2012-02-01 at 13:09 -0500, David Miller wrote:
> From: Michael Matz <matz@...e.de>
> Date: Wed, 1 Feb 2012 18:41:05 +0100 (CET)
> 
> > One problem is that it's not a new problem, GCC emitted similar code since 
> > about forever, and still they turned up only now (well, probably because 
> > ia64 is dead, but sparc64 should have similar problems). 
> 
> Indeed, on sparc64 it does do the silly 64-bit access too:
> 
> wrong:
>         ldx     [%o0+8], %g2
>         sethi   %hi(2147483648), %g1
>         or      %g2, %g1, %g1
>         jmp     %o7+8
>          stx    %g1, [%o0+8]

Ditto for powerpc64-linux:

        ld 9,8(3)
        li 10,1
        rldimi 9,10,31,32
        std 9,8(3)
        blr


Peter



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