linux-kernel - RE: A bug about system call on ARM

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Message-ID: <35FD53F367049845BC99AC72306C23D1610991B87E@CNBJMBX05.corpusers.net>
Date:	Mon, 3 Jun 2013 17:58:18 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	'Will Deacon' <will.deacon@....com>
CC:	'richard -rw- weinberger' <richard.weinberger@...il.com>,
	"'linux-arch@...r.kernel.org'" <linux-arch@...r.kernel.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: A bug about system call on ARM

Hi  Will

Oh  I see,
Thanks for your reply 

Yes ,  we are testing for it ,
But need some time to wait for the result ,
Because The stability test need some time to reproduce
this issue , And this issue doesn't reproduce 100% .


-----Original Message-----
From: Will Deacon [mailto:will.deacon@....com] 
Sent: Monday, June 03, 2013 5:54 PM
To: Wang, Yalin
Cc: 'richard -rw- weinberger'; 'linux-arch@...r.kernel.org'; 'linux-kernel@...r.kernel.org'; 'linux-arm-kernel@...ts.infradead.org'
Subject: Re: A bug about system call on ARM

On Mon, Jun 03, 2013 at 06:25:26AM +0100, Wang, Yalin wrote:
> Hi  Will,
> 
> I have a question about this patch .
> 
> If the user space is thumb mode,
> The PC should be rewind by 2 bytes,
> So the fix_up code should be
> 
> Sub lr, lr, #2 .
> 
> 
> Am I right ?

No, because we don't have OABI-compat support for Thumb applications and force everything down the EABI path instead.

Did you manage to test the patch?

Will
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