[mc1322x] Non-aligned structure copies

[Jon Smirl]

On Wed, Nov 4, 2009 at 8:55 AM, Mariano Alvira <mar at devl.org> wrote:
> On Wed, Nov 04, 2009 at 08:29:21AM -0500, Jon Smirl wrote:
>> On Wed, Nov 4, 2009 at 6:38 AM, Mariano Alvira <mar at devl.org> wrote:
>>
>> very well. OpenOCD might be able to detect this by examining each
>> instruction before running it.
>>
>> It you do a 32b store of ABCD to location 1 on ARM7 it writes DABC
>> into the word starting at zero.  The code expects it to write xABC
>> into the word at 0 and Dxxx into the word at 4. Qemu should be able to
>> detect this in its implementation of the LOAD/STORE instructions.  We
>> always want an exception on an un-aligned access. So is Qemu if is
>> byte swapping, trigger the exception instead of doing the operation.
>>
>
> Ok, those specifics will help. I should be able to take a look today.

Some options....

http://lecs.cs.ucla.edu/wiki/index.php/XScale_alignment

I turned on these compiler options and it caused a big pile of errors.


>
> -Mar.
>



-- 
Jon Smirl
jonsmirl at gmail.com