range stepping: gdbserver (x86 GNU/Linux)
authorPedro Alves <palves@redhat.com>
Thu, 23 May 2013 17:17:50 +0000 (17:17 +0000)
committerPedro Alves <palves@redhat.com>
Thu, 23 May 2013 17:17:50 +0000 (17:17 +0000)
commitc2d6af84da44465f30e3bb487721128dfe03d0e4
tree6d1037aa6d79b5fcebf8e353c5f013128e1ca8a4
parentc1e36e3e919994da4fa0da232b173939f3e44bb8
range stepping: gdbserver (x86 GNU/Linux)

This patch adds support for range stepping to GDBserver, teaching it
about vCont;r.

It'd be easy to enable this for all hardware single-step targets
without needing the linux_target_ops hook, however, at least PPC needs
special care, due to the fact that PPC atomic sequences can't be
hardware single-stepped through, a thing which GDBserver doesn't know
about.  So this leaves the support limited to x86/x86_64.

gdb/
2013-05-23  Pedro Alves  <palves@redhat.com>

* NEWS: Mention GDBserver range stepping support.

gdb/gdbserver/
2013-05-23  Yao Qi  <yao@codesourcery.com>
    Pedro Alves  <palves@redhat.com>

* linux-low.c (lwp_in_step_range): New function.
(linux_wait_1): If the thread was range stepping and stopped
outside the stepping range, report the stop to GDB.  Otherwise,
continue stepping.  Add range stepping debug output.
(linux_set_resume_request): Copy the step range from the resume
request to the lwp.
(linux_supports_range_stepping): New.
(linux_target_ops) <supports_range_stepping>: Set to
linux_supports_range_stepping.
* linux-low.h (struct linux_target_ops)
<supports_range_stepping>: New field.
(struct lwp_info) <step_range_start, step_range_end>: New fields.
* linux-x86-low.c (x86_supports_range_stepping): New.
(the_low_target) <supports_range_stepping>: Set to
x86_supports_range_stepping.
* server.c (handle_v_cont): Handle 'r' action.
(handle_v_requests): Append ";r" if the target supports range
stepping.
* target.h (struct thread_resume) <step_range_start,
step_range_end>: New fields.
(struct target_ops) <supports_range_stepping>:
New field.
(target_supports_range_stepping): New macro.
gdb/ChangeLog
gdb/NEWS
gdb/gdbserver/ChangeLog
gdb/gdbserver/linux-low.c
gdb/gdbserver/linux-low.h
gdb/gdbserver/linux-x86-low.c
gdb/gdbserver/server.c
gdb/gdbserver/target.h