[PATCH] Fix stop-on-solib event failures

[Tom Tromey]

>>>>> "Alan" == Alan Hayward <Alan.Hayward@arm.com> writes:

Alan> [ This patch replaces "[PATCH] testsuite: disable break-interp.exp for Arm
Alan>   buildbot". Instead of working around the issue, this fixes the issues. ]

Alan> On some Arm targets (namely the buildbot Arm Docker setup) placing breakpoints
Alan> on just the solib dynamic probes will cause the target process to not stop.
Alan> For stop-on-solib to work, a breakpoint also needs placing at the original
Alan> stop address.  This is due to bad placing of the probe addresses in the
Alan> linker.

My understanding is that the probe code is intended to be more efficient
than the old code.  Won't always installing the old-style breakpoint
eliminate the efficiency gain?

If the probes don't work properly on ARM, is there some way to detect that?
Why don't they work?

Alan> In addition, the gdb.base/break-interp.exp test has a extra step that is only
Alan> required for ppc64 targets.  However on Ubuntu X86 and AArch64, this causes
Alan> the program to now be stopped in an unknown location.  The fix here is to
Alan> ensure the ppc64 step is only run on ppc64 targets.  This fixes a long
Alan> standing issue.

This part seems fine.

Tom