infrun.c

早期freebsd实现

    target_remove_breakpoint (step_resume_break_address,
			      step_resume_break_shadow);
}

int signal_stop_state (signo)
     int signo;
{
  return ((signo >= 0 && signo < NSIG) ? signal_stop[signo] : 0);
}

int signal_print_state (signo)
     int signo;
{
  return ((signo >= 0 && signo < NSIG) ? signal_print[signo] : 0);
}

int signal_pass_state (signo)
     int signo;
{
  return ((signo >= 0 && signo < NSIG) ? signal_program[signo] : 0);
}

static void
sig_print_header ()
{
  printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n");
}

static void
sig_print_info (number)
     int number;
{
  char *name;

  if ((name = strsigno (number)) == NULL)
    printf_filtered ("%d\t\t", number);
  else
    printf_filtered ("%s (%d)\t", name, number);
  printf_filtered ("%s\t", signal_stop[number] ? "Yes" : "No");
  printf_filtered ("%s\t", signal_print[number] ? "Yes" : "No");
  printf_filtered ("%s\t\t", signal_program[number] ? "Yes" : "No");
  printf_filtered ("%s\n", safe_strsignal (number));
}

/* Specify how various signals in the inferior should be handled.  */

static void
handle_command (args, from_tty)
     char *args;
     int from_tty;
{
  char **argv;
  int digits, wordlen;
  int sigfirst, signum, siglast;
  int allsigs;
  int nsigs;
  unsigned char *sigs;
  struct cleanup *old_chain;

  if (args == NULL)
    {
      error_no_arg ("signal to handle");
    }

  /* Allocate and zero an array of flags for which signals to handle. */

  nsigs = signo_max () + 1;
  sigs = (unsigned char *) alloca (nsigs);
  memset (sigs, 0, nsigs);

  /* Break the command line up into args. */

  argv = buildargv (args);
  if (argv == NULL)
    {
      nomem (0);
    }
  old_chain = make_cleanup (freeargv, (char *) argv);

  /* Walk through the args, looking for signal numbers, signal names, and
     actions.  Signal numbers and signal names may be interspersed with
     actions, with the actions being performed for all signals cumulatively
     specified.  Signal ranges can be specified as <LOW>-<HIGH>. */

  while (*argv != NULL)
    {
      wordlen = strlen (*argv);
      for (digits = 0; isdigit ((*argv)[digits]); digits++) {;}
      allsigs = 0;
      sigfirst = siglast = -1;

      if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
	{
	  /* Apply action to all signals except those used by the
	     debugger.  Silently skip those. */
	  allsigs = 1;
	  sigfirst = 0;
	  siglast = nsigs - 1;
	}
      else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
	{
	  SET_SIGS (nsigs, sigs, signal_stop);
	  SET_SIGS (nsigs, sigs, signal_print);
	}
      else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
	{
	  UNSET_SIGS (nsigs, sigs, signal_program);
	}
      else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
	{
	  SET_SIGS (nsigs, sigs, signal_print);
	}
      else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
	{
	  SET_SIGS (nsigs, sigs, signal_program);
	}
      else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
	{
	  UNSET_SIGS (nsigs, sigs, signal_stop);
	}
      else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
	{
	  SET_SIGS (nsigs, sigs, signal_program);
	}
      else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
	{
	  UNSET_SIGS (nsigs, sigs, signal_print);
	  UNSET_SIGS (nsigs, sigs, signal_stop);
	}
      else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
	{
	  UNSET_SIGS (nsigs, sigs, signal_program);
	}
      else if (digits > 0)
	{
	  sigfirst = siglast = atoi (*argv);
	  if ((*argv)[digits] == '-')
	    {
	      siglast = atoi ((*argv) + digits + 1);
	    }
	  if (sigfirst > siglast)
	    {
	      /* Bet he didn't figure we'd think of this case... */
	      signum = sigfirst;
	      sigfirst = siglast;
	      siglast = signum;
	    }
	  if (sigfirst < 0 || sigfirst >= nsigs)
	    {
	      error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1);
	    }
	  if (siglast < 0 || siglast >= nsigs)
	    {
	      error ("Signal %d not in range 0-%d", siglast, nsigs - 1);
	    }
	}
      else if ((signum = strtosigno (*argv)) != 0)
	{
	  sigfirst = siglast = signum;
	}
      else
	{
	  /* Not a number and not a recognized flag word => complain.  */
	  error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
	}

      /* If any signal numbers or symbol names were found, set flags for
	 which signals to apply actions to. */

      for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
	{
	  switch (signum)
	    {
	      case SIGTRAP:
	      case SIGINT:
	        if (!allsigs && !sigs[signum])
		  {
		    if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum)))
		      {
			sigs[signum] = 1;
		      }
		    else
		      {
			printf ("Not confirmed, unchanged.\n");
			fflush (stdout);
		      }
		  }
		break;
	      default:
		sigs[signum] = 1;
		break;
	    }
	}

      argv++;
    }

  target_notice_signals();

  if (from_tty)
    {
      /* Show the results.  */
      sig_print_header ();
      for (signum = 0; signum < nsigs; signum++)
	{
	  if (sigs[signum])
	    {
	      sig_print_info (signum);
	    }
	}
    }

  do_cleanups (old_chain);
}

/* Print current contents of the tables set by the handle command.  */

static void
signals_info (signum_exp, from_tty)
     char *signum_exp;
     int from_tty;
{
  register int i;
  sig_print_header ();

  if (signum_exp)
    {
      /* First see if this is a symbol name.  */
      i = strtosigno (signum_exp);
      if (i == 0)
	{
	  /* Nope, maybe it's an address which evaluates to a signal
	     number.  */
	  i = parse_and_eval_address (signum_exp);
	  if (i >= NSIG || i < 0)
	    error ("Signal number out of bounds.");
	}
      sig_print_info (i);
      return;
    }

  printf_filtered ("\n");
  for (i = 0; i < NSIG; i++)
    {
      QUIT;

      sig_print_info (i);
    }

  printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
}

/* Save all of the information associated with the inferior<==>gdb
   connection.  INF_STATUS is a pointer to a "struct inferior_status"
   (defined in inferior.h).  */

void
save_inferior_status (inf_status, restore_stack_info)
     struct inferior_status *inf_status;
     int restore_stack_info;
{
  inf_status->pc_changed = pc_changed;
  inf_status->stop_signal = stop_signal;
  inf_status->stop_pc = stop_pc;
  inf_status->stop_frame_address = stop_frame_address;
  inf_status->stop_step = stop_step;
  inf_status->stop_stack_dummy = stop_stack_dummy;
  inf_status->stopped_by_random_signal = stopped_by_random_signal;
  inf_status->trap_expected = trap_expected;
  inf_status->step_range_start = step_range_start;
  inf_status->step_range_end = step_range_end;
  inf_status->step_frame_address = step_frame_address;
  inf_status->step_over_calls = step_over_calls;
  inf_status->step_resume_break_address = step_resume_break_address;
  inf_status->stop_after_trap = stop_after_trap;
  inf_status->stop_soon_quietly = stop_soon_quietly;
  /* Save original bpstat chain here; replace it with copy of chain. 
     If caller's caller is walking the chain, they'll be happier if we
     hand them back the original chain when restore_i_s is called.  */
  inf_status->stop_bpstat = stop_bpstat;
  stop_bpstat = bpstat_copy (stop_bpstat);
  inf_status->breakpoint_proceeded = breakpoint_proceeded;
  inf_status->restore_stack_info = restore_stack_info;
  
  read_register_bytes(0, inf_status->register_context, REGISTER_BYTES);
  
  record_selected_frame (&(inf_status->selected_frame_address),
			 &(inf_status->selected_level));
  return;
}

void
restore_inferior_status (inf_status)
     struct inferior_status *inf_status;
{
  FRAME fid;
  int level = inf_status->selected_level;

  pc_changed = inf_status->pc_changed;
  stop_signal = inf_status->stop_signal;
  stop_pc = inf_status->stop_pc;
  stop_frame_address = inf_status->stop_frame_address;
  stop_step = inf_status->stop_step;
  stop_stack_dummy = inf_status->stop_stack_dummy;
  stopped_by_random_signal = inf_status->stopped_by_random_signal;
  trap_expected = inf_status->trap_expected;
  step_range_start = inf_status->step_range_start;
  step_range_end = inf_status->step_range_end;
  step_frame_address = inf_status->step_frame_address;
  step_over_calls = inf_status->step_over_calls;
  step_resume_break_address = inf_status->step_resume_break_address;
  stop_after_trap = inf_status->stop_after_trap;
  stop_soon_quietly = inf_status->stop_soon_quietly;
  bpstat_clear (&stop_bpstat);
  stop_bpstat = inf_status->stop_bpstat;
  breakpoint_proceeded = inf_status->breakpoint_proceeded;

  write_register_bytes(0, inf_status->register_context, REGISTER_BYTES);

  /* The inferior can be gone if the user types "print exit(0)"
     (and perhaps other times).  */
  if (target_has_stack && inf_status->restore_stack_info)
    {
      fid = find_relative_frame (get_current_frame (),
				 &level);

      /* If inf_status->selected_frame_address is NULL, there was no
	 previously selected frame.  */
      if (fid == 0 ||
	  FRAME_FP (fid) != inf_status->selected_frame_address ||
	  level != 0)
	{
#if 1
	  /* I'm not sure this error message is a good idea.  I have
	     only seen it occur after "Can't continue previously
	     requested operation" (we get called from do_cleanups), in
	     which case it just adds insult to injury (one confusing
	     error message after another.  Besides which, does the
	     user really care if we can't restore the previously
	     selected frame?  */
	  fprintf (stderr, "Unable to restore previously selected frame.\n");
#endif
	  select_frame (get_current_frame (), 0);
	  return;
	}
      
      select_frame (fid, inf_status->selected_level);
    }
}


void
_initialize_infrun ()
{
  register int i;
  register int numsigs;

  add_info ("signals", signals_info,
	    "What debugger does when program gets various signals.\n\
Specify a signal number as argument to print info on that signal only.");
  add_info_alias ("handle", "signals", 0);

  add_com ("handle", class_run, handle_command,
	   "Specify how to handle a signal.\n\
Args are signal numbers and actions to apply to those signals.\n\
Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\
Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\
The special arg \"all\" is recognized to mean all signals except those\n\
used by the debugger, typically SIGTRAP and SIGINT.\n\
Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
\"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
Stop means reenter debugger if this signal happens (implies print).\n\
Print means print a message if this signal happens.\n\
Pass means let program see this signal; otherwise program doesn't know.\n\
Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
Pass and Stop may be combined.");

  stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command,
	   "There is no `stop' command, but you can set a hook on `stop'.\n\
This allows you to set a list of commands to be run each time execution\n\
of the inferior program stops.", &cmdlist);

  numsigs = signo_max () + 1;
  signal_stop    = (unsigned char *)    
		   xmalloc (sizeof (signal_stop[0]) * numsigs);
  signal_print   = (unsigned char *)
		   xmalloc (sizeof (signal_print[0]) * numsigs);
  signal_program = (unsigned char *)
		   xmalloc (sizeof (signal_program[0]) * numsigs);
  for (i = 0; i < numsigs; i++)
    {
      signal_stop[i] = 1;
      signal_print[i] = 1;
      signal_program[i] = 1;
    }

  /* Signals caused by debugger's own actions
     should not be given to the program afterwards.  */
  signal_program[SIGTRAP] = 0;
  signal_program[SIGINT] = 0;

  /* Signals that are not errors should not normally enter the debugger.  */
#ifdef SIGALRM
  signal_stop[SIGALRM] = 0;
  signal_print[SIGALRM] = 0;
#endif /* SIGALRM */
#ifdef SIGVTALRM
  signal_stop[SIGVTALRM] = 0;
  signal_print[SIGVTALRM] = 0;
#endif /* SIGVTALRM */
#ifdef SIGPROF
  signal_stop[SIGPROF] = 0;
  signal_print[SIGPROF] = 0;
#endif /* SIGPROF */
#ifdef SIGCHLD
  signal_stop[SIGCHLD] = 0;
  signal_print[SIGCHLD] = 0;
#endif /* SIGCHLD */
#ifdef SIGCLD
  signal_stop[SIGCLD] = 0;
  signal_print[SIGCLD] = 0;
#endif /* SIGCLD */
#ifdef SIGIO
  signal_stop[SIGIO] = 0;
  signal_print[SIGIO] = 0;
#endif /* SIGIO */
#ifdef SIGURG
  signal_stop[SIGURG] = 0;
  signal_print[SIGURG] = 0;
#endif /* SIGURG */
}