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References: <20181207090135.7651-1-luc.michel@greensocs.com>
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From: Peter Maydell <peter.maydell@linaro.org>
Date: Fri, 4 Jan 2019 15:12:10 +0000
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Subject: Re: [Qemu-devel] [PATCH v8 00/16] gdbstub: support for the
 multiprocess extension
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To: Luc Michel <luc.michel@greensocs.com>
Cc: QEMU Developers <qemu-devel@nongnu.org>, qemu-arm <qemu-arm@nongnu.org>, Sai Pavan Boddu <saipava@xilinx.com>, Edgar Iglesias <edgari@xilinx.com>, Alistair Francis <alistair@alistair23.me>, =?UTF-8?Q?Philippe_Mathieu=2DDaud=C3=A9?= <f4bug@amsat.org>, Mark Burton <mark.burton@greensocs.com>, Eduardo Habkost <ehabkost@redhat.com>

On Fri, 7 Dec 2018 at 09:01, Luc Michel <luc.michel@greensocs.com> wrote:
> This series adds support for the multiprocess extension of the GDB
> remote protocol in the QEMU GDB stub.
>
> This extension is useful to split QEMU emulated CPUs in different
> processes from the point of view of the GDB client. It adds the
> possibility to debug different kind of processors (e.g. an AArch64 and
> an ARMv7 CPU) at the same time (it is not possible otherwise since GDB
> expects an SMP view at the thread granularity.

I've applied this patchset to target-arm.next, thanks.
(I fixed up a few checkpatch nits about block comment style.)

> To test this patchset, you can use the following commands:
>
> (Note that this requires a recent enough GDB, I think GDB 7.2 is OK.
> Also, it must be compiled to support both ARM and AArch64 architectures)
>
> Run QEMU: (-smp 6 in xlnx-zcu102 enables both cortex-a53 and cortex-r5
> CPUs)
>
> qemu-system-aarch64 -M xlnx-zcu102 -gdb tcp::1234 -S -smp 6
>
> Run the following commands in GDB:
>
> target extended :1234
> add-inferior
> inferior 2
> attach 2
> info threads

This seems a bit clumsy -- is it just the limitations of
gdb here? I was expecting that just connecting to the
remote would cause gdb to interrogate it and attach to
all the inferior processes that it had.

thanks
-- PMM