linux-kernel - Re: [-mm patch] ptrace: Fix EFL_OFFSET value according to i386 pda changes (was Re: BUG on 2.6.20-rc1 when using gdb)

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Message-ID: <20061220210736.GC28900@slug>
Date:	Wed, 20 Dec 2006 21:07:36 +0000
From:	Frederik Deweerdt <deweerdt@...e.fr>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andrew Morton <akpm@...l.org>,
	"Andrew J. Barr" <andrew.james.barr@...il.com>,
	linux-kernel@...r.kernel.org, Jan Beulich <jbeulich@...ell.com>,
	Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	walt <w41ter@...il.com>
Subject: Re: [-mm patch] ptrace: Fix EFL_OFFSET value according to i386 pda changes (was Re: BUG on 2.6.20-rc1 when using gdb)

On Wed, Dec 20, 2006 at 12:53:33PM -0800, Jeremy Fitzhardinge wrote:
> Frederik Deweerdt wrote:
> > It works too, thanks. BTW, I wondered if the "case GS:" in getreg() made
> > sense now?
> 
> Sorry, what do you mean?  It looks OK to me, but I'm not sure what
> you're referring to.
My bad, that's the code I'm referring to:

121 static unsigned long getreg(struct task_struct *child,
122         unsigned long regno)
[...]
126         switch (regno >> 2) {
127                 case GS:
128                         retval = child->thread.gs;
129                         break;

What seem weird to me is that putreg(GS) will end up putting 'value' in:
child->thread.esp0 - sizeof(struct pt_regs) + (GS - 1)*4
whereas getreg(GS) will return the value of child->thread.gs
I must miss something, but the symetry seemed odd to me.

Regards,
Frederik
> 
>     J
> -
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