[rtems commit] arm: Optimize context switch

[Gedare Bloom]

On Tue, May 23, 2017 at 3:09 AM, Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
> On 22/05/17 16:49, Gedare Bloom wrote:
>
>> Everything. 'hello' doesn't even work. I can't debug until later.
>> Probably gem5 deals with some processor context a bit differently and
>> may be incorrectly.
>
>
> It works on Qemu, a real Cortex-R4 and a real Cortex-A9. It would be nice if
> you could debug this a bit. Do you reach _Thread_Handler()? Interesting
> functions are _CPU_ISR_Set_level(), _CPU_Context_restore() and
> _CPU_Context_switch().
>
Thanks for the help Sebastian. The problem was that the simulator did
not handle an LDM instruction that loads to the PC properly. I have
submitted a fix to gem5 that ought to be merged soon I guess.

Anyone needing to cherrypick it meanwhile can pick it up at
https://gem5-review.googlesource.com/c/3520/

Gedare

>>
>> On Mon, May 22, 2017 at 1:07 AM, Sebastian Huber
>> <sebastian.huber at embedded-brains.de>  wrote:
>>>
>>> Which tests fail?
>>>
>>> On 19/05/17 20:52, Gedare Bloom wrote:
>>>>
>>>> This commit causes an error when running realview_pbx_a9_qemu in the
>>>> gem5 simulator. I have only been able to identify that this is the
>>>> problematic commit. I have not been able to debug further.
>
>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
> PGP     : Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>