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Re: [PATCH v2 for-6.2] target/arm: Advertise MVE to gdb when present
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH v2 for-6.2] target/arm: Advertise MVE to gdb when present |
Date: |
Mon, 1 Nov 2021 18:21:07 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 |
On 11/1/21 17:08, Peter Maydell wrote:
> Cortex-M CPUs with MVE should advertise this fact to gdb, using the
> org.gnu.gdb.arm.m-profile-mve XML feature, which defines the VPR
> register. Presence of this feature also tells gdb to create
> pseudo-registers Q0..Q7, so we do not need to tell gdb about them
> separately.
>
> Note that unless you have a very recent GDB that includes this fix:
> http://patches-tcwg.linaro.org/patch/58133/ gdb will mis-print the
> individual fields of the VPR register as zero (but showing the whole
> thing as hex, eg with "print /x $vpr" will give the correct value).
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> ---
> Reposting this unchanged except to remove the 'RFC' tag, as
> the gdb patches have now gone upstream and the XML layout is
> therefore finalized.
> ---
> configs/targets/aarch64-softmmu.mak | 2 +-
> configs/targets/arm-linux-user.mak | 2 +-
> configs/targets/arm-softmmu.mak | 2 +-
> configs/targets/armeb-linux-user.mak | 2 +-
> target/arm/gdbstub.c | 25 +++++++++++++++++++++++++
> gdb-xml/arm-m-profile-mve.xml | 19 +++++++++++++++++++
> 6 files changed, 48 insertions(+), 4 deletions(-)
> create mode 100644 gdb-xml/arm-m-profile-mve.xml
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>