alignment handler instruction endian-ness

Ben Dooks ben.dooks at
Fri Jul 19 10:50:12 EDT 2013

On 19/07/13 15:05, Russell King - ARM Linux wrote:
> On Fri, Jul 19, 2013 at 03:01:02PM +0100, Jon Medhurst (Tixy) wrote:
>> On Fri, 2013-07-19 at 12:09 +0100, Russell King - ARM Linux wrote:
>>> On Fri, Jul 19, 2013 at 11:58:45AM +0100, Ben Dooks wrote:
>>>> I ran in to an issue with the alignment handler when running BE8 where
>>>> it loads instructions and fails to swap.
>>>> Is there a better way of swapping instructions for ARM when loading
>>>> from arbitrary places? Have I missed any other places this could happen?
>>> Maybe we need a macro which deals with this automatically?
>> Like the stuff in arch/arm/include/asm/opcodes.h ?
> Not like asm/opcodes.h does at the moment, because there's really no
> reason whatsoever that it isn't using the standard swab stuff, which
> will automatically use the rev/rev16 instructions where available.
> There's really no reason to open code that stuff.

It seems it is only open coded for the __ASSEMBLY__ version,
it does use swabXX() for the !__ASSEMBLY__ case.

Should we use __mem_to_opcode_arm() in the aligned and abort

Ben Dooks
Senior Engineer				Codethink - Providing Genius

More information about the linux-arm-kernel mailing list