[PATCH] libdebugger: Fix ARMv7-M with -O0

[Chris Johns]

On 21/10/20 2:50 am, Sebastian Huber wrote:
> On 02/04/2020 09:09, Sebastian Huber wrote:
> 
>> On 02/04/2020 08:46, Chris Johns wrote:
>>
>>> On 2020-04-02 16:53, Sebastian Huber wrote:
>>>> Hallo Chris,
>>>> On 21/03/2020 07:45, Sebastian Huber wrote:
>>>>> On 20/03/2020 22:23, Chris Johns wrote:
>>>>>>> On 20 Mar 2020, at 4:49 pm, Sebastian Huber
>>>>>>> <sebastian.huber at embedded-brains.de> wrote:
>>>>>>>
>>>>>>> On 20/03/2020 05:15, Chris Johns wrote:
>>>>>>>
>>>>>>>> On 19/3/20 7:52 pm, Sebastian Huber wrote:
>>>>>>>>> The ARMv7-M architecture has no CP-15.  The inline assembly for the
>>>>>>>>> CP-15 access leads to assembler errors if compiled with -O0.
>>>>>>>> I would like to understand this one in detail to see why there is cp15
>>>>>>>> in the build.
>>>>>>> In ARMv7-M the system registers are memory mapped.
>>>>>>>
>>>>>>> If I compile a Cortex-M based BSP with -O0, then I get:
>>>>>>>
>>>>>> BSP?
>>>>> For example the atsamv BSP.
>>>> could you please have a look at this. Being able to build with -O0 is quite
>>>> helpful during BSP development.
>>>
>>> Is this important for 5.1.0? 
>>
>> It is not absolutely necessary, but I regularly had to fix this locally. We
>> have several ARMv7-M based BSPs. This was my first attempt to address this issue:
>>
>> https://lists.rtems.org/pipermail/devel/2019-February/024914.html
>>
> We work no on another Cortex-M based BSP and building with -O0 would be really
> nice.

Great. Does this mean you are adding support for libdebugger for this model of ARM?

Chris