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Re: [Qemu-arm] [PATCH v8 00/16] gdbstub: support for the multiprocess ex

From: Peter Maydell
Subject: Re: [Qemu-arm] [PATCH v8 00/16] gdbstub: support for the multiprocess extension
Date: Fri, 4 Jan 2019 15:12:10 +0000

On Fri, 7 Dec 2018 at 09:01, Luc Michel <address@hidden> 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.

-- PMM

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