Re: [Qemu-devel] [PATCH v4 13/54] plugin: add user-facing API

[Alex Bennée]

Aaron Lindsay OS <address@hidden> writes:

> One thing I would find useful is the ability to access register values
> during an execution-time callback. I think the easiest way to do that
> generically would be to expose them via the gdb functionality (like
> Pavel's earlier patchset did [1]), though that (currently) limits you to
> the general-purpose registers. Ideally it would be nice be able to
> access other registers (i.e. floating-point, or maybe even system
> registers), though those are more difficult to do generically.

ARM already has system register support via the gdbstub XML interface so
it's certainly doable. The trick is how we do that in a probable way
without leaking the gdb remote protocol into plugins (which is just very
ugly).

> Perhaps if we added some sort of architectural-support checking for
> individual plugins like I mentioned in another response to this
> patchset, we could allow some limited architecture-specific
> functionality in this vein? I confess I haven't thought through all the
> ramifications of that yet, though.

I was wondering if exposing the Elf Type would be enough? It's portable
enough that plugins should be able to work with it without defining our
own architecture enumeration.

>
> -Aaron
>
> [1] - See qemulib_read_register() at
>       https://patchwork.ozlabs.org/patch/925393/


--
Alex Bennée