Re: [PATCH qemu v2 3/3] target/arm/gdbstub: Support reading M security extension registers from GDB

[Peter Maydell]

On Tue, 17 Jan 2023 at 22:48, David Reiss <dreiss@meta.com> wrote:
>
> On 1/17/23 1:42 PM, Richard Henderson wrote:
> > Is there a reason why these are separate from m_systemreg?
>
> GDB puts these in a separate file, and J-Link puts them in a separate feature 
> block.
> In general, I think it's nice to separate stuff related to the secure 
> extension
> so folks not working with it can ignore it more easily.

The reason is "there is an unwritten standard for where the
registers are supposed to go" -- if we don't follow it then
although gdb will display the registers to the user fine it
won't recognize them for purposes of doing operations like
bactracing across secure-calls. I have nudged a local gdb dev
to suggest that the gdb remote docs be improved to write down
what gdb requires in the way of XML feature and register names.

thanks
-- PMM