Re: gdb support for SME-without-SVE ?

[Peter Maydell via Gdb <gdb@sourceware.org>]

On Fri, 30 Jan 2026 at 16:16, Thiago Jung Bauermann
<thiago.bauermann@linaro.org> wrote:
>
> Peter Maydell <peter.maydell@linaro.org> writes:
>
> > But now after restarting the VM and running this command again,
> > it does nothing:
> >
> > root@debian:~/gdb-build# make check-gdb TESTS=gdb.arch/aarch64-sme-sanity.exp
> > make[1]: Entering directory '/root/gdb-build/gdb'
> > make[2]: Entering directory '/root/gdb-build/gdb/testsuite'
> > make check-single
> > make[3]: Entering directory '/root/gdb-build/gdb/testsuite'
> > rm -f *core* gdb.sum gdb.log
> > rootme=`pwd`; export rootme;
> > srcdir=../../../binutils-gdb/gdb/testsuite ; export srcdir ;
> > EXPECT=`if [ "${READ1}" != "" ] ; then echo ${rootme}/expect-read1;
> > elif [ "${READMORE}" != "" ] ; then echo ${rootme}/expect-readmore;
> > elif [ -f ${rootme}/../../expect/expect ] ; then echo
> > ${rootme}/../../expect/expect ; else echo expect ; fi` ; export EXPECT
> > ; EXEEXT= ; export EXEEXT ;
> > LD_LIBRARY_PATH=$rootme/../../expect:$rootme/../../libstdc++:$rootme/../../tk/unix:$rootme/../../tcl/unix:$rootme/../../bfd:$rootme/../../opcodes:$LD_LIBRARY_PATH;
> > export LD_LIBRARY_PATH; if [ -f ${rootme}/../../expect/expect ] ; then
> > TCL_LIBRARY=${srcdir}/../../tcl/library ; export TCL_LIBRARY ; fi ;
> > runtest --status  gdb.arch/aarch64-sme-sanity.exp ; \
> > result=$?; \
> > if test -e gdb.sum; then \
> >   /bin/bash ../../../binutils-gdb/gdb/testsuite/lib/dg-add-core-file-count.sh; \
> >   sed -n '/=== gdb Summary ===/,$ p' gdb.sum; \
> > fi; \
> > exit $result
> > WARNING: No tool specified
> > Test run by root on Fri Jan 30 12:25:14 2026
> > Native configuration is aarch64-unknown-linux-gnu
> >
> >                 ===  tests ===
> >
> > Schedule of variations:
> >     unix
> >
> > Running target unix
> > Using /usr/share/dejagnu/baseboards/unix.exp as board description file
> > for target.
> > Using /usr/share/dejagnu/config/unix.exp as generic interface file for target.
> > WARNING: Couldn't find tool config file for unix, using default.
>
> Hm, weird. I don't know about this problem. Sounds like some generated
> Dejagnu config file is missing. Maybe try running just "make" before
> "make check-gdb" to see if the file is generated again?

I did try that, but it didn't help. ("Some file that dejagnu created
is corrupt/truncated" seems quite possible, because I had to kill
the VM after the guest kernel hit the Oops.)

> > Is there some way I can get it to tell me why it isn't running anything?
>
> The gdb.log file sometimes has more information than what appears on the
> console.

Where would I find it? (The make output suggests it would be
in gdb/testsuite/ as that is what the rm command deletes, but
there is no gdb.log file in that directory.)

Is there something I can rm in my build directory that will delete
all the testsuite stuff and force it to recreate it ? (I would
prefer not to have to blow away the whole build directory and
spend hours waiting for gdb to be rebuilt...)

thanks
-- PMM