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Re: [PATCH 5/5] [RFC] target/arm: Advertise MVE to gdb when present


From: Richard Henderson
Subject: Re: [PATCH 5/5] [RFC] target/arm: Advertise MVE to gdb when present
Date: Tue, 21 Sep 2021 20:33:02 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

On 9/21/21 9:29 AM, 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).

NB: the gdb patches to implement this have not yet landed in
gdb upstream, so this patch is RFC status only until that
happens and the XML is finalized.

Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
---
  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

Looks like it'll do what's advertised.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~



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