[microblaze-uclinux] Re: [PATCH 08/60] microblaze_v4: exception handling

[Michal Simek <monstr@xxxxxxxxx>]

> On Thu, Jun 26, 2008 at 5:29 AM,  <monstr@xxxxxxxxx> 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.

M

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