process.
Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
- 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
+ 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
Foundation, Inc.
This file is part of GDB.
static void build_infrun (void);
-static int follow_fork ();
+static int follow_fork (void);
static void set_schedlock_func (char *args, int from_tty,
struct cmd_list_element *c);
\f
static int
-follow_fork ()
+follow_fork (void)
{
const char *follow_mode = follow_fork_mode_string;
int follow_child = (follow_mode == follow_fork_mode_child);
/* The following are the only cases in which we keep going;
the above cases end in a continue or goto. */
case TARGET_WAITKIND_FORKED:
+ case TARGET_WAITKIND_VFORKED:
stop_signal = TARGET_SIGNAL_TRAP;
pending_follow.kind = ecs->ws.kind;
pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
- stop_pc = read_pc_pid (ecs->ptid);
- ecs->saved_inferior_ptid = inferior_ptid;
- inferior_ptid = ecs->ptid;
- /* The second argument of bpstat_stop_status is meant to help
- distinguish between a breakpoint trap and a singlestep trap.
- This is only important on targets where DECR_PC_AFTER_BREAK
- is non-zero. The prev_pc test is meant to distinguish between
- singlestepping a trap instruction, and singlestepping thru a
- jump to the instruction following a trap instruction. */
-
- stop_bpstat = bpstat_stop_status (&stop_pc,
- currently_stepping (ecs) &&
- prev_pc !=
- stop_pc - DECR_PC_AFTER_BREAK);
- ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
- inferior_ptid = ecs->saved_inferior_ptid;
- goto process_event_stop_test;
+ stop_pc = read_pc ();
- /* If this a platform which doesn't allow a debugger to touch a
- vfork'd inferior until after it exec's, then we'd best keep
- our fingers entirely off the inferior, other than continuing
- it. This has the unfortunate side-effect that catchpoints
- of vforks will be ignored. But since the platform doesn't
- allow the inferior be touched at vfork time, there's really
- little choice. */
- case TARGET_WAITKIND_VFORKED:
- stop_signal = TARGET_SIGNAL_TRAP;
- pending_follow.kind = ecs->ws.kind;
+ /* Assume that catchpoints are not really software breakpoints. If
+ some future target implements them using software breakpoints then
+ that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
+ we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
+ bpstat_stop_status will not decrement the PC. */
- /* Is this a vfork of the parent? If so, then give any
- vfork catchpoints a chance to trigger now. (It's
- dangerous to do so if the child canot be touched until
- it execs, and the child has not yet exec'd. We probably
- should warn the user to that effect when the catchpoint
- triggers...) */
- if (ptid_equal (ecs->ptid, inferior_ptid))
- {
- pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
- pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
- }
+ stop_bpstat = bpstat_stop_status (&stop_pc, 1);
- /* If we've seen the child's vfork event but cannot really touch
- the child until it execs, then we must continue the child now.
- Else, give any vfork catchpoints a chance to trigger now. */
- else
+ ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
+
+ /* If no catchpoint triggered for this, then keep going. */
+ if (ecs->random_signal)
{
- pending_follow.fork_event.child_pid = PIDGET (ecs->ptid);
- pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid;
- target_post_startup_inferior (pid_to_ptid
- (pending_follow.fork_event.
- child_pid));
+ stop_signal = TARGET_SIGNAL_0;
+ keep_going (ecs);
+ return;
}
-
- stop_pc = read_pc ();
- /* The second argument of bpstat_stop_status is meant to help
- distinguish between a breakpoint trap and a singlestep trap.
- This is only important on targets where DECR_PC_AFTER_BREAK
- is non-zero. The prev_pc test is meant to distinguish between
- singlestepping a trap instruction, and singlestepping thru a
- jump to the instruction following a trap instruction. */
-
- stop_bpstat = bpstat_stop_status (&stop_pc,
- currently_stepping (ecs) &&
- prev_pc !=
- stop_pc - DECR_PC_AFTER_BREAK);
- ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
goto process_event_stop_test;
case TARGET_WAITKIND_EXECD:
stop_pc = read_pc_pid (ecs->ptid);
ecs->saved_inferior_ptid = inferior_ptid;
inferior_ptid = ecs->ptid;
- /* The second argument of bpstat_stop_status is meant to help
- distinguish between a breakpoint trap and a singlestep trap.
- This is only important on targets where DECR_PC_AFTER_BREAK
- is non-zero. The prev_pc test is meant to distinguish between
- singlestepping a trap instruction, and singlestepping thru a
- jump to the instruction following a trap instruction. */
-
- stop_bpstat = bpstat_stop_status (&stop_pc,
- currently_stepping (ecs) &&
- prev_pc !=
- stop_pc - DECR_PC_AFTER_BREAK);
+
+ /* Assume that catchpoints are not really software breakpoints. If
+ some future target implements them using software breakpoints then
+ that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
+ we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
+ bpstat_stop_status will not decrement the PC. */
+
+ stop_bpstat = bpstat_stop_status (&stop_pc, 1);
+
ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
inferior_ptid = ecs->saved_inferior_ptid;
+
+ /* If no catchpoint triggered for this, then keep going. */
+ if (ecs->random_signal)
+ {
+ stop_signal = TARGET_SIGNAL_0;
+ keep_going (ecs);
+ return;
+ }
goto process_event_stop_test;
/* These syscall events are returned on HP-UX, as part of its
else
ecs->random_signal = 1;
- /* If a fork, vfork or exec event was seen, then there are two
- possible responses we can make:
-
- 1. If a catchpoint triggers for the event (ecs->random_signal == 0),
- then we must stop now and issue a prompt. We will resume
- the inferior when the user tells us to.
- 2. If no catchpoint triggers for the event (ecs->random_signal == 1),
- then we must resume the inferior now and keep checking.
-
- In either case, we must take appropriate steps to "follow" the
- the fork/vfork/exec when the inferior is resumed. For example,
- if follow-fork-mode is "child", then we must detach from the
- parent inferior and follow the new child inferior.
-
- In either case, setting pending_follow causes the next resume()
- to take the appropriate following action. */
-process_event_stop_test:
- if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
- {
- if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
- {
- trap_expected = 1;
- stop_signal = TARGET_SIGNAL_0;
- keep_going (ecs);
- return;
- }
- }
- else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED)
- {
- if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
- {
- stop_signal = TARGET_SIGNAL_0;
- keep_going (ecs);
- return;
- }
- }
- else if (ecs->ws.kind == TARGET_WAITKIND_EXECD)
- {
- pending_follow.kind = ecs->ws.kind;
- if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
- {
- trap_expected = 1;
- stop_signal = TARGET_SIGNAL_0;
- keep_going (ecs);
- return;
- }
- }
+process_event_stop_test:
/* For the program's own signals, act according to
the signal handling tables. */
/* Make sure that the current_frame's pc is correct. This
is a correction for setting up the frame info before doing
DECR_PC_AFTER_BREAK */
- if (target_has_execution && get_current_frame ())
- (get_current_frame ())->pc = read_pc ();
+ if (target_has_execution)
+ /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
+ DECR_PC_AFTER_BREAK, the program counter can change. Ask the
+ frame code to check for this and sort out any resultant mess.
+ DECR_PC_AFTER_BREAK needs to just go away. */
+ deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
if (target_has_execution && breakpoints_inserted)
{
LOCATION: Print only location
SRC_AND_LOC: Print location and source line */
if (do_frame_printing)
- show_and_print_stack_frame (deprecated_selected_frame, -1, source_flag);
+ print_stack_frame (deprecated_selected_frame, -1, source_flag);
/* Display the auto-display expressions. */
do_displays ();
projects / deliverable / binutils-gdb.git / blobdiff