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target/arm: Advertise MVE to gdb when present

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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>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211101160814.5103-1-peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2021-11-01 16:08:14 +00:00 • committed by Richard Henderson
parent da2f02b360
commit dbd9e08476
6 changed files with 48 additions and 4 deletions
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19
gdb-xml/arm-m-profile-mve.xml Normal file
View file

@ -0,0 +1,19 @@
<?xml version="1.0"?>
<!-- Copyright (C) 2021 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.arm.m-profile-mve">
<flags id="vpr_reg" size="4">
<!-- ARMv8.1-M and MVE: Unprivileged and privileged Access. -->
<field name="P0" start="0" end="15"/>
<!-- ARMv8.1-M: Privileged Access only. -->
<field name="MASK01" start="16" end="19"/>
<!-- ARMv8.1-M: Privileged Access only. -->
<field name="MASK23" start="20" end="23"/>
</flags>
<reg name="vpr" bitsize="32" type="vpr_reg"/>
</feature>