[PATCH 00/12 V2] Use reinsert breakpoint for vCont;s

[Yao Qi <qiyaoltc@gmail.com>]

Here is the V2 of this patch series, V1 can be found
https://sourceware.org/ml/gdb-patches/2016-05/msg00358.html

Nowadays, reinsert breakpoint is used in GDBserver to step over a
breakpoint.  I want to use it to handle vCont;s too.  The idea is that
when GDBserver receives resume_step request from GDB, use the software
single step logic, insert reinsert_breakpoint on the next pcs, and
resume the thread.  This means we have multiple reinsert_breakpoints
for different threads for either step-over or vCont;s.

Patches 2~5 are the fixes to existing GDBserver problems on step-over
with reinsert_breakpoint in various cases (exit, fork, and vfork).
Although these 4 patches can be sent as another patch series, I still
include them in this series, as they are derived from the V1 review.

Patches 7 and 12 aren't changed.  All review comments are addressed
in the rest of patches.  Once this series goes in, I'll start to rename
'reinsert_breakpoint' and 'other_breakpoint' to match their usages in
GDBserver.

Regression tested on {x86_64, arm, aarch64}-linux.

*** BLURB HERE ***

Yao Qi (12):
  Switch to current thread in finish_step_over
  More assert checks on reinsert breakpoint
  Step over exit with reinsert breakpoints
  Delete reinsert breakpoints from forked child
  Handle reinsert breakpoints for vforked child
  Pass breakpoint type in set_breakpoint_at
  Create sub classes of 'struct breakpoint'
  Refactor clone_all_breakpoints
  Make reinsert_breakpoint thread specific
  Switch current_thread to lwp's thread in
    install_software_single_step_breakpoints
  Use reinsert_breakpoint for vCont;s
  Support vCont s and S actions with software single step

 gdb/gdbserver/gdbthread.h                   |   3 +
 gdb/gdbserver/inferiors.c                   |  12 +
 gdb/gdbserver/linux-low.c                   | 206 +++++++++++++++--
 gdb/gdbserver/mem-break.c                   | 341 +++++++++++++++++++++-------
 gdb/gdbserver/mem-break.h                   |  44 ++--
 gdb/gdbserver/server.c                      |  17 +-
 gdb/testsuite/gdb.base/step-over-exit.c     |  50 ++++
 gdb/testsuite/gdb.base/step-over-exit.exp   | 127 +++++++++++
 gdb/testsuite/gdb.base/step-over-fork-1.c   |  51 +++++
 gdb/testsuite/gdb.base/step-over-fork-1.exp | 106 +++++++++
 10 files changed, 842 insertions(+), 115 deletions(-)
 create mode 100644 gdb/testsuite/gdb.base/step-over-exit.c
 create mode 100644 gdb/testsuite/gdb.base/step-over-exit.exp
 create mode 100644 gdb/testsuite/gdb.base/step-over-fork-1.c
 create mode 100644 gdb/testsuite/gdb.base/step-over-fork-1.exp

-- 
1.9.1