cortex-m xml register descriptions for m-system

[Christopher Friedt]

On Wed, Dec 16, 2015 at 8:51 AM, Tristan Gingold <gingold@adacore.com> wrote:
>
>> On 15 Dec 2015, at 16:35, Christopher Friedt <chrisfriedt@gmail.com> wrote:
>>
>> Just so we can have consensus, please indicate what you think is the
>> best solution - Pedro, Yao, & Tristan.
>>
>> Based on Tristan's feedback as well, it confirms that these registers
>> are necessary for DWARF handling.
>
> Not sure about that.  To my understanding, DWARF doesn’t need to refer
> to psp or msp.

Wait... just yesterday you wrote:

"I do think so too.

I have just written a patch so that gdb unwinds correctly on cortex-m
exceptions, and this of course requires that gdb knows about at least
psp."

Maybe I'm confused. I presumed DWARF was involved in unwinding to some
extent, but if its purely just used for debugging, it might not
require PSP / MSP at all.

In any case PSP / MSP are most definitely used in unwinding.