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

[Sebastian Huber]

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

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