[PATCH v3 0/2] Fix handling of null stap semaphores

[George Barrett <bob at bob131 dot so>]

GDB's handling of userspace SystemTap probes is currently inconsistent
with the specification of the format[0]: the absence of a semaphore for
a particular probe is recorded within its ELF note by setting the
address value to zero, but the current implementation doesn't check the
value against zero until after a relocation has been applied.

The primary patch in this set is #2 ('Fix handling of null stap
semaphores'). Writing the test case revealed some issues with other
stap-related tests, fixes for which have been split into patch #1 as
suggested in a previous review.

v3 of this patchset carries changes to the test case suggested in a
previous review, namely the removal of an xfail directive and an
additional explanatory comment.

[0]: https://sourceware.org/systemtap/wiki/UserSpaceProbeImplementation

George Barrett (2):
  gdb/testsuite/gdb.base/stap-probe: Minor clean-up
  Fix handling of null stap semaphores

 gdb/stap-probe.c                      |  7 ++--
 gdb/testsuite/gdb.base/stap-probe.c   |  4 ++-
 gdb/testsuite/gdb.base/stap-probe.exp | 47 ++++++++++++++++++++++-----
 3 files changed, 45 insertions(+), 13 deletions(-)

-- 
2.24.1