From: Erik Christiansen <erik@dd.nec.com.au>
To: Jerry Walden <jwalden@digitalatlantic.com>
Cc: Linux PPC embedded <linuxppc-embedded@lists.linuxppc.org>
Subject: Re: Stack Frame Calc Problem in head_4xx.S
Date: Mon, 5 May 2003 11:41:41 +1000 [thread overview]
Message-ID: <20030505014141.GB712@dd.nec.com.au> (raw)
In-Reply-To: <EGEGIJHKDKJGAJMGIDPNGEOPCLAA.jwalden@digitalatlantic.com>
On Sat, May 03, 2003 at 05:20:51PM -0400, Jerry Walden wrote:
>
> After line 15 executes r1 = 0xc00f4ff0
> which seems fine so far (according to the map file it is pointing to the
> proper location)
>
> After line 16 executes r1=0xc00f6ff0
> which is still within the bounds of init_task_union
>
> After line 17 execute r1 = 0xc00f6fe0 which seems like a problem to me,
The code seems to be doing exactly what you ask it to.
stwu updates r1 by the offset, after completing the store. (That's
what the "u" is for.)
Given:
> STACK_FRAME_OVERHEAD = 16
How can you expect any other result?:
> 17 stwu r0,-STACK_FRAME_OVERHEAD(r1)
If this is as intended, then your problem lies earlier, it appears.
(But it sounds a little like you're unaware that you're modifying the
stack pointer, not just indexing from it.)
Regards,
Erik
--
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prev parent reply other threads:[~2003-05-05 1:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-03 21:20 Stack Frame Calc Problem in head_4xx.S Jerry Walden
2003-05-03 22:21 ` Gary D. Thomas
2003-05-03 23:08 ` Jerry Walden
2003-05-05 1:41 ` Erik Christiansen [this message]
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