From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cagney <cagney@gnu.org>
To: Mark Kettenis <kettenis@chello.nl>
Cc: gdb-patches@sources.redhat.com
Subject: Re: [patch/rfc] Use insert_step_resume_breakpoint everywhere
Date: Wed, 12 May 2004 20:47:00 -0000
Message-id: <40A28D7B.90007@gnu.org>
References: <40A01953.7060906@gnu.org> <40A161F4.6050801@gnu.org> <200405122029.i4CKT0r4006056@elgar.kettenis.dyndns.org>
X-SW-Source: 2004-05/msg00383.html

This patch, or one of your other patches breaks FreeBSD signal
trampoline handling.  I now get:
(Which exact FreeBSD)

The value of step_frame_id indicates that we were stepping in handler,
and then try to set a step-resume breakpoint in main.  It might be
relevant to note that on FreeBSD, the signal trampoline calls the
handler, and that signal trampoline is provided by the kernel so we
don't have debug info for it.
If you stepi into the trampoline, does gdb know that its got a signal 
trampoline?  When stepping, this code:

  if (step_range_end != 1
      && (step_over_calls == STEP_OVER_UNDEBUGGABLE
          || step_over_calls == STEP_OVER_ALL)
      && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
    {
      /* The inferior, while doing a "step" or "next", has ended up in
         a signal trampoline (either by a signal being delivered or by
         the signal handler returning).  Just single-step until the
         inferior leaves the trampoline (either by calling the handler
         or returning).  */
      keep_going (ecs);
      return;
    }
should be triggering causing the inferior to single step which makes it 
setting a breakpoint in main most puzzling.

Try moving the above to before:

  if (step_over_calls == STEP_OVER_UNDEBUGGABLE
      && ecs->stop_func_name == NULL)
    {
      /* There is no symbol, not even a minimal symbol, corresponding
         to the address where we just stopped.  So we just stepped
         inside undebuggable code.  Since we want to step over this
         kind of code, we keep going until the inferior returns from
         the current function.  */
      handle_step_into_function (ecs);
      return;
    }
Andrew