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List:       microblaze-uclinux
Subject:    [microblaze-uclinux] Re: [PATCH 08/60] microblaze_v4: exception handling
From:       Michal Simek <monstr () seznam ! cz>
Date:       2008-06-26 21:06:11
Message-ID: 486404C3.10301 () seznam ! cz
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Ray Lee napsal(a):
> On Thu, Jun 26, 2008 at 12:19 PM, Michal Simek <monstr@seznam.cz> wrote:
>>> On Thu, Jun 26, 2008 at 5:29 AM,  <monstr@seznam.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).

thanks for notice. I'll keep in my mind when I test it.

M


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