[PATCH 0/9] software single-step support rework, fix limitations

Pedro Alves palves@redhat.com
Fri Sep 26 00:39:00 GMT 2014

This series reworks software single-step support.  In a nutshell:

- Makes single-step breakpoints regular breakpoints and puts them on
  the global location chain.

- Makes the moribund location machinery aware of software single-step

- Removes the currently limitation that only 2 single-step breakpoints
  can be inserted.  Some archs, like PPC, need this.

- Makes software single-step work when stepping through read-only code

- Adds support for having multiple threads software single-stepping
  simultaneously.  Currently, in non-stop, all single-step requests
  are handled by displaced stepping the threads, which means threads
  are serialized, because only one thread can be displaced stepping at
  any given time.

- Finally eliminates deprecated_insert_raw_breakpoint and friends.

- Removes a set of run control globals along the way.

- And cleans things up here and there.

Tested on:

 - x86_64 Fedora 20
 - x86_64 Fedora 20 w/ 'software single-step on x86' series
 - PPC64 Fedora 18

Pedro Alves (9):
  Decide whether we may have removed breakpoints based on step_over_info
  Rewrite non-continuable watchpoints handling
  Put single-step breakpoints on the bp_location chain
  Remove deprecated_insert_raw_breakpoint and friends
  Switch back to stepped thread: clear step-over info
  thread.c: cleanup breakpoint deletion
  infrun.c: add for_each_just_stopped_thread
  Make single-step breakpoints be per-thread
  Non-stop + software single-step archs: don't force displaced-stepping
    for all single-steps

 gdb/breakpoint.c  | 402 +++++++++++++-----------------------------------------
 gdb/breakpoint.h  |  31 ++---
 gdb/gdbthread.h   |  25 ++++
 gdb/infrun.c      | 360 ++++++++++++++++++++++--------------------------
 gdb/infrun.h      |   4 +
 gdb/record-full.c |   8 +-
 gdb/thread.c      |  80 ++++++++---
 7 files changed, 364 insertions(+), 546 deletions(-)


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