linux-kernel - Re: [PATCH 08/60] microblaze

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Message-ID: <2c0942db0806261243g52edd45eo11ded19bb1f24004@mail.gmail.com>
Date:	Thu, 26 Jun 2008 12:43:20 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	monstr@...nam.cz
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de,
	linux-arch@...r.kernel.org, stephen.neuendorffer@...inx.com,
	John.Linn@...inx.com, john.williams@...alogix.com, matthew@....cx,
	will.newton@...il.com, drepper@...hat.com,
	microblaze-uclinux@...e.uq.edu.au, grant.likely@...retlab.ca,
	linuxppc-dev@...abs.org, vapier.adi@...il.com,
	alan@...rguk.ukuu.org.uk, hpa@...or.com,
	"Michal Simek" <monstr@...str.eu>
Subject: Re: [PATCH 08/60] microblaze_v4: exception handling

On Thu, Jun 26, 2008 at 12:19 PM, Michal Simek <monstr@...nam.cz> wrote:
>> On Thu, Jun 26, 2008 at 5:29 AM,  <monstr@...nam.cz> wrote:
>>> +ex_sw:
>>> +       /* Get the destination register number into r5 */
>>> +       lbui    r5, r0, ex_reg_op;
>>> +       /* Form store_word jump table offset (sw_table + (8 * regnum)) */
>>> +       la      r6, r0, sw_table;
>>> +       add     r5, r5, r5;
>>> +       add     r5, r5, r5;
>>> +       add     r5, r5, r5;
>>> +       add     r5, r5, r6;
>>> +       bra     r5;
>>
>> Possibly stupid question: This is part of the unaligned store word
>> exception handler, yes? Shouldn't the above add's be addk's to
>> preserve the state of the carry register pre/post store?
>
> I don't think that addk is important. I have some tests for exception, I want to
> cover full exception handling.

Okay. It doesn't match your other exception handlers, though, which is
why I noticed it in the first place (they use addk).
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