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Re: [PATCH v2 for-6.2] target/arm: Advertise MVE to gdb when present

From: Richard Henderson
Subject: Re: [PATCH v2 for-6.2] target/arm: Advertise MVE to gdb when present
Date: Mon, 1 Nov 2021 13:38:49 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

On 11/1/21 12:08 PM, 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

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.

Thanks, applied to target-arm.next.


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