1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
6 Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
31 #include "breakpoint.h"
35 #include "cli/cli-script.h"
37 #include "gdbthread.h"
47 #include "gdb_assert.h"
49 /* Prototypes for local functions */
51 static void signals_info (char *, int);
53 static void handle_command (char *, int);
55 static void sig_print_info (enum target_signal);
57 static void sig_print_header (void);
59 static void resume_cleanups (void *);
61 static int hook_stop_stub (void *);
63 static int restore_selected_frame (void *);
65 static void build_infrun (void);
67 static int follow_fork (void);
69 static void set_schedlock_func (char *args, int from_tty,
70 struct cmd_list_element *c);
72 struct execution_control_state;
74 static int currently_stepping (struct execution_control_state *ecs);
76 static void xdb_handle_command (char *args, int from_tty);
78 static int prepare_to_proceed (void);
80 void _initialize_infrun (void);
82 int inferior_ignoring_startup_exec_events = 0;
83 int inferior_ignoring_leading_exec_events = 0;
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug = 0;
90 /* In asynchronous mode, but simulating synchronous execution. */
92 int sync_execution = 0;
94 /* wait_for_inferior and normal_stop use this to notify the user
95 when the inferior stopped in a different thread than it had been
98 static ptid_t previous_inferior_ptid;
100 /* This is true for configurations that may follow through execl() and
101 similar functions. At present this is only true for HP-UX native. */
103 #ifndef MAY_FOLLOW_EXEC
104 #define MAY_FOLLOW_EXEC (0)
107 static int may_follow_exec = MAY_FOLLOW_EXEC;
109 /* If the program uses ELF-style shared libraries, then calls to
110 functions in shared libraries go through stubs, which live in a
111 table called the PLT (Procedure Linkage Table). The first time the
112 function is called, the stub sends control to the dynamic linker,
113 which looks up the function's real address, patches the stub so
114 that future calls will go directly to the function, and then passes
115 control to the function.
117 If we are stepping at the source level, we don't want to see any of
118 this --- we just want to skip over the stub and the dynamic linker.
119 The simple approach is to single-step until control leaves the
122 However, on some systems (e.g., Red Hat's 5.2 distribution) the
123 dynamic linker calls functions in the shared C library, so you
124 can't tell from the PC alone whether the dynamic linker is still
125 running. In this case, we use a step-resume breakpoint to get us
126 past the dynamic linker, as if we were using "next" to step over a
129 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
130 linker code or not. Normally, this means we single-step. However,
131 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
132 address where we can place a step-resume breakpoint to get past the
133 linker's symbol resolution function.
135 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
136 pretty portable way, by comparing the PC against the address ranges
137 of the dynamic linker's sections.
139 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
140 it depends on internal details of the dynamic linker. It's usually
141 not too hard to figure out where to put a breakpoint, but it
142 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
143 sanity checking. If it can't figure things out, returning zero and
144 getting the (possibly confusing) stepping behavior is better than
145 signalling an error, which will obscure the change in the
148 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
149 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
152 /* This function returns TRUE if pc is the address of an instruction
153 that lies within the dynamic linker (such as the event hook, or the
156 This function must be used only when a dynamic linker event has
157 been caught, and the inferior is being stepped out of the hook, or
158 undefined results are guaranteed. */
160 #ifndef SOLIB_IN_DYNAMIC_LINKER
161 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
164 /* On some systems, the PC may be left pointing at an instruction that won't
165 actually be executed. This is usually indicated by a bit in the PSW. If
166 we find ourselves in such a state, then we step the target beyond the
167 nullified instruction before returning control to the user so as to avoid
170 #ifndef INSTRUCTION_NULLIFIED
171 #define INSTRUCTION_NULLIFIED 0
174 /* We can't step off a permanent breakpoint in the ordinary way, because we
175 can't remove it. Instead, we have to advance the PC to the next
176 instruction. This macro should expand to a pointer to a function that
177 does that, or zero if we have no such function. If we don't have a
178 definition for it, we have to report an error. */
179 #ifndef SKIP_PERMANENT_BREAKPOINT
180 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
182 default_skip_permanent_breakpoint (void)
185 The program is stopped at a permanent breakpoint, but GDB does not know\n\
186 how to step past a permanent breakpoint on this architecture. Try using\n\
187 a command like `return' or `jump' to continue execution.");
192 /* Convert the #defines into values. This is temporary until wfi control
193 flow is completely sorted out. */
195 #ifndef HAVE_STEPPABLE_WATCHPOINT
196 #define HAVE_STEPPABLE_WATCHPOINT 0
198 #undef HAVE_STEPPABLE_WATCHPOINT
199 #define HAVE_STEPPABLE_WATCHPOINT 1
202 #ifndef CANNOT_STEP_HW_WATCHPOINTS
203 #define CANNOT_STEP_HW_WATCHPOINTS 0
205 #undef CANNOT_STEP_HW_WATCHPOINTS
206 #define CANNOT_STEP_HW_WATCHPOINTS 1
209 /* Tables of how to react to signals; the user sets them. */
211 static unsigned char *signal_stop;
212 static unsigned char *signal_print;
213 static unsigned char *signal_program;
215 #define SET_SIGS(nsigs,sigs,flags) \
217 int signum = (nsigs); \
218 while (signum-- > 0) \
219 if ((sigs)[signum]) \
220 (flags)[signum] = 1; \
223 #define UNSET_SIGS(nsigs,sigs,flags) \
225 int signum = (nsigs); \
226 while (signum-- > 0) \
227 if ((sigs)[signum]) \
228 (flags)[signum] = 0; \
231 /* Value to pass to target_resume() to cause all threads to resume */
233 #define RESUME_ALL (pid_to_ptid (-1))
235 /* Command list pointer for the "stop" placeholder. */
237 static struct cmd_list_element *stop_command;
239 /* Nonzero if breakpoints are now inserted in the inferior. */
241 static int breakpoints_inserted;
243 /* Function inferior was in as of last step command. */
245 static struct symbol *step_start_function;
247 /* Nonzero if we are expecting a trace trap and should proceed from it. */
249 static int trap_expected;
252 /* Nonzero if we want to give control to the user when we're notified
253 of shared library events by the dynamic linker. */
254 static int stop_on_solib_events;
257 /* Nonzero means expecting a trace trap
258 and should stop the inferior and return silently when it happens. */
262 /* Nonzero means expecting a trap and caller will handle it themselves.
263 It is used after attach, due to attaching to a process;
264 when running in the shell before the child program has been exec'd;
265 and when running some kinds of remote stuff (FIXME?). */
267 enum stop_kind stop_soon;
269 /* Nonzero if proceed is being used for a "finish" command or a similar
270 situation when stop_registers should be saved. */
272 int proceed_to_finish;
274 /* Save register contents here when about to pop a stack dummy frame,
275 if-and-only-if proceed_to_finish is set.
276 Thus this contains the return value from the called function (assuming
277 values are returned in a register). */
279 struct regcache *stop_registers;
281 /* Nonzero if program stopped due to error trying to insert breakpoints. */
283 static int breakpoints_failed;
285 /* Nonzero after stop if current stack frame should be printed. */
287 static int stop_print_frame;
289 static struct breakpoint *step_resume_breakpoint = NULL;
291 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
292 interactions with an inferior that is running a kernel function
293 (aka, a system call or "syscall"). wait_for_inferior therefore
294 may have a need to know when the inferior is in a syscall. This
295 is a count of the number of inferior threads which are known to
296 currently be running in a syscall. */
297 static int number_of_threads_in_syscalls;
299 /* This is a cached copy of the pid/waitstatus of the last event
300 returned by target_wait()/deprecated_target_wait_hook(). This
301 information is returned by get_last_target_status(). */
302 static ptid_t target_last_wait_ptid;
303 static struct target_waitstatus target_last_waitstatus;
305 /* This is used to remember when a fork, vfork or exec event
306 was caught by a catchpoint, and thus the event is to be
307 followed at the next resume of the inferior, and not
311 enum target_waitkind kind;
318 char *execd_pathname;
322 static const char follow_fork_mode_child[] = "child";
323 static const char follow_fork_mode_parent[] = "parent";
325 static const char *follow_fork_mode_kind_names[] = {
326 follow_fork_mode_child,
327 follow_fork_mode_parent,
331 static const char *follow_fork_mode_string = follow_fork_mode_parent;
337 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
339 return target_follow_fork (follow_child);
343 follow_inferior_reset_breakpoints (void)
345 /* Was there a step_resume breakpoint? (There was if the user
346 did a "next" at the fork() call.) If so, explicitly reset its
349 step_resumes are a form of bp that are made to be per-thread.
350 Since we created the step_resume bp when the parent process
351 was being debugged, and now are switching to the child process,
352 from the breakpoint package's viewpoint, that's a switch of
353 "threads". We must update the bp's notion of which thread
354 it is for, or it'll be ignored when it triggers. */
356 if (step_resume_breakpoint)
357 breakpoint_re_set_thread (step_resume_breakpoint);
359 /* Reinsert all breakpoints in the child. The user may have set
360 breakpoints after catching the fork, in which case those
361 were never set in the child, but only in the parent. This makes
362 sure the inserted breakpoints match the breakpoint list. */
364 breakpoint_re_set ();
365 insert_breakpoints ();
368 /* EXECD_PATHNAME is assumed to be non-NULL. */
371 follow_exec (int pid, char *execd_pathname)
374 struct target_ops *tgt;
376 if (!may_follow_exec)
379 /* This is an exec event that we actually wish to pay attention to.
380 Refresh our symbol table to the newly exec'd program, remove any
383 If there are breakpoints, they aren't really inserted now,
384 since the exec() transformed our inferior into a fresh set
387 We want to preserve symbolic breakpoints on the list, since
388 we have hopes that they can be reset after the new a.out's
389 symbol table is read.
391 However, any "raw" breakpoints must be removed from the list
392 (e.g., the solib bp's), since their address is probably invalid
395 And, we DON'T want to call delete_breakpoints() here, since
396 that may write the bp's "shadow contents" (the instruction
397 value that was overwritten witha TRAP instruction). Since
398 we now have a new a.out, those shadow contents aren't valid. */
399 update_breakpoints_after_exec ();
401 /* If there was one, it's gone now. We cannot truly step-to-next
402 statement through an exec(). */
403 step_resume_breakpoint = NULL;
404 step_range_start = 0;
407 /* What is this a.out's name? */
408 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
410 /* We've followed the inferior through an exec. Therefore, the
411 inferior has essentially been killed & reborn. */
413 /* First collect the run target in effect. */
414 tgt = find_run_target ();
415 /* If we can't find one, things are in a very strange state... */
417 error ("Could find run target to save before following exec");
419 gdb_flush (gdb_stdout);
420 target_mourn_inferior ();
421 inferior_ptid = pid_to_ptid (saved_pid);
422 /* Because mourn_inferior resets inferior_ptid. */
425 /* That a.out is now the one to use. */
426 exec_file_attach (execd_pathname, 0);
428 /* And also is where symbols can be found. */
429 symbol_file_add_main (execd_pathname, 0);
431 /* Reset the shared library package. This ensures that we get
432 a shlib event when the child reaches "_start", at which point
433 the dld will have had a chance to initialize the child. */
434 #if defined(SOLIB_RESTART)
437 #ifdef SOLIB_CREATE_INFERIOR_HOOK
438 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
441 /* Reinsert all breakpoints. (Those which were symbolic have
442 been reset to the proper address in the new a.out, thanks
443 to symbol_file_command...) */
444 insert_breakpoints ();
446 /* The next resume of this inferior should bring it to the shlib
447 startup breakpoints. (If the user had also set bp's on
448 "main" from the old (parent) process, then they'll auto-
449 matically get reset there in the new process.) */
452 /* Non-zero if we just simulating a single-step. This is needed
453 because we cannot remove the breakpoints in the inferior process
454 until after the `wait' in `wait_for_inferior'. */
455 static int singlestep_breakpoints_inserted_p = 0;
457 /* The thread we inserted single-step breakpoints for. */
458 static ptid_t singlestep_ptid;
460 /* If another thread hit the singlestep breakpoint, we save the original
461 thread here so that we can resume single-stepping it later. */
462 static ptid_t saved_singlestep_ptid;
463 static int stepping_past_singlestep_breakpoint;
466 /* Things to clean up if we QUIT out of resume (). */
468 resume_cleanups (void *ignore)
473 static const char schedlock_off[] = "off";
474 static const char schedlock_on[] = "on";
475 static const char schedlock_step[] = "step";
476 static const char *scheduler_mode = schedlock_off;
477 static const char *scheduler_enums[] = {
485 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
487 /* NOTE: cagney/2002-03-17: The deprecated_add_show_from_set()
488 function clones the set command passed as a parameter. The clone
489 operation will include (BUG?) any ``set'' command callback, if
490 present. Commands like ``info set'' call all the ``show''
491 command callbacks. Unfortunately, for ``show'' commands cloned
492 from ``set'', this includes callbacks belonging to ``set''
493 commands. Making this worse, this only occures if
494 deprecated_add_show_from_set() is called after add_cmd_sfunc()
496 if (cmd_type (c) == set_cmd)
497 if (!target_can_lock_scheduler)
499 scheduler_mode = schedlock_off;
500 error ("Target '%s' cannot support this command.", target_shortname);
505 /* Resume the inferior, but allow a QUIT. This is useful if the user
506 wants to interrupt some lengthy single-stepping operation
507 (for child processes, the SIGINT goes to the inferior, and so
508 we get a SIGINT random_signal, but for remote debugging and perhaps
509 other targets, that's not true).
511 STEP nonzero if we should step (zero to continue instead).
512 SIG is the signal to give the inferior (zero for none). */
514 resume (int step, enum target_signal sig)
516 int should_resume = 1;
517 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
520 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
523 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
524 over an instruction that causes a page fault without triggering
525 a hardware watchpoint. The kernel properly notices that it shouldn't
526 stop, because the hardware watchpoint is not triggered, but it forgets
527 the step request and continues the program normally.
528 Work around the problem by removing hardware watchpoints if a step is
529 requested, GDB will check for a hardware watchpoint trigger after the
531 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
532 remove_hw_watchpoints ();
535 /* Normally, by the time we reach `resume', the breakpoints are either
536 removed or inserted, as appropriate. The exception is if we're sitting
537 at a permanent breakpoint; we need to step over it, but permanent
538 breakpoints can't be removed. So we have to test for it here. */
539 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
540 SKIP_PERMANENT_BREAKPOINT ();
542 if (SOFTWARE_SINGLE_STEP_P () && step)
544 /* Do it the hard way, w/temp breakpoints */
545 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
546 /* ...and don't ask hardware to do it. */
548 /* and do not pull these breakpoints until after a `wait' in
549 `wait_for_inferior' */
550 singlestep_breakpoints_inserted_p = 1;
551 singlestep_ptid = inferior_ptid;
554 /* If there were any forks/vforks/execs that were caught and are
555 now to be followed, then do so. */
556 switch (pending_follow.kind)
558 case TARGET_WAITKIND_FORKED:
559 case TARGET_WAITKIND_VFORKED:
560 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
565 case TARGET_WAITKIND_EXECD:
566 /* follow_exec is called as soon as the exec event is seen. */
567 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
574 /* Install inferior's terminal modes. */
575 target_terminal_inferior ();
581 resume_ptid = RESUME_ALL; /* Default */
583 if ((step || singlestep_breakpoints_inserted_p)
584 && (stepping_past_singlestep_breakpoint
585 || (!breakpoints_inserted && breakpoint_here_p (read_pc ()))))
587 /* Stepping past a breakpoint without inserting breakpoints.
588 Make sure only the current thread gets to step, so that
589 other threads don't sneak past breakpoints while they are
592 resume_ptid = inferior_ptid;
595 if ((scheduler_mode == schedlock_on)
596 || (scheduler_mode == schedlock_step
597 && (step || singlestep_breakpoints_inserted_p)))
599 /* User-settable 'scheduler' mode requires solo thread resume. */
600 resume_ptid = inferior_ptid;
603 if (CANNOT_STEP_BREAKPOINT)
605 /* Most targets can step a breakpoint instruction, thus
606 executing it normally. But if this one cannot, just
607 continue and we will hit it anyway. */
608 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
611 target_resume (resume_ptid, step, sig);
614 discard_cleanups (old_cleanups);
618 /* Clear out all variables saying what to do when inferior is continued.
619 First do this, then set the ones you want, then call `proceed'. */
622 clear_proceed_status (void)
625 step_range_start = 0;
627 step_frame_id = null_frame_id;
628 step_over_calls = STEP_OVER_UNDEBUGGABLE;
630 stop_soon = NO_STOP_QUIETLY;
631 proceed_to_finish = 0;
632 breakpoint_proceeded = 1; /* We're about to proceed... */
634 /* Discard any remaining commands or status from previous stop. */
635 bpstat_clear (&stop_bpstat);
638 /* This should be suitable for any targets that support threads. */
641 prepare_to_proceed (void)
644 struct target_waitstatus wait_status;
646 /* Get the last target status returned by target_wait(). */
647 get_last_target_status (&wait_ptid, &wait_status);
649 /* Make sure we were stopped either at a breakpoint, or because
651 if (wait_status.kind != TARGET_WAITKIND_STOPPED
652 || (wait_status.value.sig != TARGET_SIGNAL_TRAP
653 && wait_status.value.sig != TARGET_SIGNAL_INT))
658 if (!ptid_equal (wait_ptid, minus_one_ptid)
659 && !ptid_equal (inferior_ptid, wait_ptid))
661 /* Switched over from WAIT_PID. */
662 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
664 if (wait_pc != read_pc ())
666 /* Switch back to WAIT_PID thread. */
667 inferior_ptid = wait_ptid;
669 /* FIXME: This stuff came from switch_to_thread() in
670 thread.c (which should probably be a public function). */
671 flush_cached_frames ();
672 registers_changed ();
674 select_frame (get_current_frame ());
677 /* We return 1 to indicate that there is a breakpoint here,
678 so we need to step over it before continuing to avoid
679 hitting it straight away. */
680 if (breakpoint_here_p (wait_pc))
688 /* Record the pc of the program the last time it stopped. This is
689 just used internally by wait_for_inferior, but need to be preserved
690 over calls to it and cleared when the inferior is started. */
691 static CORE_ADDR prev_pc;
693 /* Basic routine for continuing the program in various fashions.
695 ADDR is the address to resume at, or -1 for resume where stopped.
696 SIGGNAL is the signal to give it, or 0 for none,
697 or -1 for act according to how it stopped.
698 STEP is nonzero if should trap after one instruction.
699 -1 means return after that and print nothing.
700 You should probably set various step_... variables
701 before calling here, if you are stepping.
703 You should call clear_proceed_status before calling proceed. */
706 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
711 step_start_function = find_pc_function (read_pc ());
715 if (addr == (CORE_ADDR) -1)
717 /* If there is a breakpoint at the address we will resume at,
718 step one instruction before inserting breakpoints
719 so that we do not stop right away (and report a second
720 hit at this breakpoint). */
722 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
725 #ifndef STEP_SKIPS_DELAY
726 #define STEP_SKIPS_DELAY(pc) (0)
727 #define STEP_SKIPS_DELAY_P (0)
729 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
730 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
731 is slow (it needs to read memory from the target). */
732 if (STEP_SKIPS_DELAY_P
733 && breakpoint_here_p (read_pc () + 4)
734 && STEP_SKIPS_DELAY (read_pc ()))
742 /* In a multi-threaded task we may select another thread
743 and then continue or step.
745 But if the old thread was stopped at a breakpoint, it
746 will immediately cause another breakpoint stop without
747 any execution (i.e. it will report a breakpoint hit
748 incorrectly). So we must step over it first.
750 prepare_to_proceed checks the current thread against the thread
751 that reported the most recent event. If a step-over is required
752 it returns TRUE and sets the current thread to the old thread. */
753 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
757 /* We will get a trace trap after one instruction.
758 Continue it automatically and insert breakpoints then. */
762 insert_breakpoints ();
763 /* If we get here there was no call to error() in
764 insert breakpoints -- so they were inserted. */
765 breakpoints_inserted = 1;
768 if (siggnal != TARGET_SIGNAL_DEFAULT)
769 stop_signal = siggnal;
770 /* If this signal should not be seen by program,
771 give it zero. Used for debugging signals. */
772 else if (!signal_program[stop_signal])
773 stop_signal = TARGET_SIGNAL_0;
775 annotate_starting ();
777 /* Make sure that output from GDB appears before output from the
779 gdb_flush (gdb_stdout);
781 /* Refresh prev_pc value just prior to resuming. This used to be
782 done in stop_stepping, however, setting prev_pc there did not handle
783 scenarios such as inferior function calls or returning from
784 a function via the return command. In those cases, the prev_pc
785 value was not set properly for subsequent commands. The prev_pc value
786 is used to initialize the starting line number in the ecs. With an
787 invalid value, the gdb next command ends up stopping at the position
788 represented by the next line table entry past our start position.
789 On platforms that generate one line table entry per line, this
790 is not a problem. However, on the ia64, the compiler generates
791 extraneous line table entries that do not increase the line number.
792 When we issue the gdb next command on the ia64 after an inferior call
793 or a return command, we often end up a few instructions forward, still
794 within the original line we started.
796 An attempt was made to have init_execution_control_state () refresh
797 the prev_pc value before calculating the line number. This approach
798 did not work because on platforms that use ptrace, the pc register
799 cannot be read unless the inferior is stopped. At that point, we
800 are not guaranteed the inferior is stopped and so the read_pc ()
801 call can fail. Setting the prev_pc value here ensures the value is
802 updated correctly when the inferior is stopped. */
803 prev_pc = read_pc ();
805 /* Resume inferior. */
806 resume (oneproc || step || bpstat_should_step (), stop_signal);
808 /* Wait for it to stop (if not standalone)
809 and in any case decode why it stopped, and act accordingly. */
810 /* Do this only if we are not using the event loop, or if the target
811 does not support asynchronous execution. */
812 if (!event_loop_p || !target_can_async_p ())
814 wait_for_inferior ();
820 /* Start remote-debugging of a machine over a serial link. */
826 init_wait_for_inferior ();
827 stop_soon = STOP_QUIETLY;
830 /* Always go on waiting for the target, regardless of the mode. */
831 /* FIXME: cagney/1999-09-23: At present it isn't possible to
832 indicate to wait_for_inferior that a target should timeout if
833 nothing is returned (instead of just blocking). Because of this,
834 targets expecting an immediate response need to, internally, set
835 things up so that the target_wait() is forced to eventually
837 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
838 differentiate to its caller what the state of the target is after
839 the initial open has been performed. Here we're assuming that
840 the target has stopped. It should be possible to eventually have
841 target_open() return to the caller an indication that the target
842 is currently running and GDB state should be set to the same as
844 wait_for_inferior ();
848 /* Initialize static vars when a new inferior begins. */
851 init_wait_for_inferior (void)
853 /* These are meaningless until the first time through wait_for_inferior. */
856 breakpoints_inserted = 0;
857 breakpoint_init_inferior (inf_starting);
859 /* Don't confuse first call to proceed(). */
860 stop_signal = TARGET_SIGNAL_0;
862 /* The first resume is not following a fork/vfork/exec. */
863 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
865 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
866 number_of_threads_in_syscalls = 0;
868 clear_proceed_status ();
870 stepping_past_singlestep_breakpoint = 0;
873 /* This enum encodes possible reasons for doing a target_wait, so that
874 wfi can call target_wait in one place. (Ultimately the call will be
875 moved out of the infinite loop entirely.) */
879 infwait_normal_state,
880 infwait_thread_hop_state,
881 infwait_nullified_state,
882 infwait_nonstep_watch_state
885 /* Why did the inferior stop? Used to print the appropriate messages
886 to the interface from within handle_inferior_event(). */
887 enum inferior_stop_reason
889 /* We don't know why. */
891 /* Step, next, nexti, stepi finished. */
893 /* Found breakpoint. */
895 /* Inferior terminated by signal. */
897 /* Inferior exited. */
899 /* Inferior received signal, and user asked to be notified. */
903 /* This structure contains what used to be local variables in
904 wait_for_inferior. Probably many of them can return to being
905 locals in handle_inferior_event. */
907 struct execution_control_state
909 struct target_waitstatus ws;
910 struct target_waitstatus *wp;
913 CORE_ADDR stop_func_start;
914 CORE_ADDR stop_func_end;
915 char *stop_func_name;
916 struct symtab_and_line sal;
917 int remove_breakpoints_on_following_step;
919 struct symtab *current_symtab;
920 int handling_longjmp; /* FIXME */
922 ptid_t saved_inferior_ptid;
923 int stepping_through_solib_after_catch;
924 bpstat stepping_through_solib_catchpoints;
925 int enable_hw_watchpoints_after_wait;
926 int new_thread_event;
927 struct target_waitstatus tmpstatus;
928 enum infwait_states infwait_state;
933 void init_execution_control_state (struct execution_control_state *ecs);
935 void handle_inferior_event (struct execution_control_state *ecs);
937 static void step_into_function (struct execution_control_state *ecs);
938 static void insert_step_resume_breakpoint (struct frame_info *step_frame,
939 struct execution_control_state
941 static void stop_stepping (struct execution_control_state *ecs);
942 static void prepare_to_wait (struct execution_control_state *ecs);
943 static void keep_going (struct execution_control_state *ecs);
944 static void print_stop_reason (enum inferior_stop_reason stop_reason,
947 /* Wait for control to return from inferior to debugger.
948 If inferior gets a signal, we may decide to start it up again
949 instead of returning. That is why there is a loop in this function.
950 When this function actually returns it means the inferior
951 should be left stopped and GDB should read more commands. */
954 wait_for_inferior (void)
956 struct cleanup *old_cleanups;
957 struct execution_control_state ecss;
958 struct execution_control_state *ecs;
960 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
961 &step_resume_breakpoint);
963 /* wfi still stays in a loop, so it's OK just to take the address of
964 a local to get the ecs pointer. */
967 /* Fill in with reasonable starting values. */
968 init_execution_control_state (ecs);
970 /* We'll update this if & when we switch to a new thread. */
971 previous_inferior_ptid = inferior_ptid;
973 overlay_cache_invalid = 1;
975 /* We have to invalidate the registers BEFORE calling target_wait
976 because they can be loaded from the target while in target_wait.
977 This makes remote debugging a bit more efficient for those
978 targets that provide critical registers as part of their normal
981 registers_changed ();
985 if (deprecated_target_wait_hook)
986 ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
988 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
990 /* Now figure out what to do with the result of the result. */
991 handle_inferior_event (ecs);
993 if (!ecs->wait_some_more)
996 do_cleanups (old_cleanups);
999 /* Asynchronous version of wait_for_inferior. It is called by the
1000 event loop whenever a change of state is detected on the file
1001 descriptor corresponding to the target. It can be called more than
1002 once to complete a single execution command. In such cases we need
1003 to keep the state in a global variable ASYNC_ECSS. If it is the
1004 last time that this function is called for a single execution
1005 command, then report to the user that the inferior has stopped, and
1006 do the necessary cleanups. */
1008 struct execution_control_state async_ecss;
1009 struct execution_control_state *async_ecs;
1012 fetch_inferior_event (void *client_data)
1014 static struct cleanup *old_cleanups;
1016 async_ecs = &async_ecss;
1018 if (!async_ecs->wait_some_more)
1020 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1021 &step_resume_breakpoint);
1023 /* Fill in with reasonable starting values. */
1024 init_execution_control_state (async_ecs);
1026 /* We'll update this if & when we switch to a new thread. */
1027 previous_inferior_ptid = inferior_ptid;
1029 overlay_cache_invalid = 1;
1031 /* We have to invalidate the registers BEFORE calling target_wait
1032 because they can be loaded from the target while in target_wait.
1033 This makes remote debugging a bit more efficient for those
1034 targets that provide critical registers as part of their normal
1035 status mechanism. */
1037 registers_changed ();
1040 if (deprecated_target_wait_hook)
1042 deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1044 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1046 /* Now figure out what to do with the result of the result. */
1047 handle_inferior_event (async_ecs);
1049 if (!async_ecs->wait_some_more)
1051 /* Do only the cleanups that have been added by this
1052 function. Let the continuations for the commands do the rest,
1053 if there are any. */
1054 do_exec_cleanups (old_cleanups);
1056 if (step_multi && stop_step)
1057 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1059 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1063 /* Prepare an execution control state for looping through a
1064 wait_for_inferior-type loop. */
1067 init_execution_control_state (struct execution_control_state *ecs)
1069 /* ecs->another_trap? */
1070 ecs->random_signal = 0;
1071 ecs->remove_breakpoints_on_following_step = 0;
1072 ecs->handling_longjmp = 0; /* FIXME */
1073 ecs->stepping_through_solib_after_catch = 0;
1074 ecs->stepping_through_solib_catchpoints = NULL;
1075 ecs->enable_hw_watchpoints_after_wait = 0;
1076 ecs->sal = find_pc_line (prev_pc, 0);
1077 ecs->current_line = ecs->sal.line;
1078 ecs->current_symtab = ecs->sal.symtab;
1079 ecs->infwait_state = infwait_normal_state;
1080 ecs->waiton_ptid = pid_to_ptid (-1);
1081 ecs->wp = &(ecs->ws);
1084 /* Call this function before setting step_resume_breakpoint, as a
1085 sanity check. There should never be more than one step-resume
1086 breakpoint per thread, so we should never be setting a new
1087 step_resume_breakpoint when one is already active. */
1089 check_for_old_step_resume_breakpoint (void)
1091 if (step_resume_breakpoint)
1093 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1096 /* Return the cached copy of the last pid/waitstatus returned by
1097 target_wait()/deprecated_target_wait_hook(). The data is actually
1098 cached by handle_inferior_event(), which gets called immediately
1099 after target_wait()/deprecated_target_wait_hook(). */
1102 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1104 *ptidp = target_last_wait_ptid;
1105 *status = target_last_waitstatus;
1108 /* Switch thread contexts, maintaining "infrun state". */
1111 context_switch (struct execution_control_state *ecs)
1113 /* Caution: it may happen that the new thread (or the old one!)
1114 is not in the thread list. In this case we must not attempt
1115 to "switch context", or we run the risk that our context may
1116 be lost. This may happen as a result of the target module
1117 mishandling thread creation. */
1119 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1120 { /* Perform infrun state context switch: */
1121 /* Save infrun state for the old thread. */
1122 save_infrun_state (inferior_ptid, prev_pc,
1123 trap_expected, step_resume_breakpoint,
1125 step_range_end, &step_frame_id,
1126 ecs->handling_longjmp, ecs->another_trap,
1127 ecs->stepping_through_solib_after_catch,
1128 ecs->stepping_through_solib_catchpoints,
1129 ecs->current_line, ecs->current_symtab);
1131 /* Load infrun state for the new thread. */
1132 load_infrun_state (ecs->ptid, &prev_pc,
1133 &trap_expected, &step_resume_breakpoint,
1135 &step_range_end, &step_frame_id,
1136 &ecs->handling_longjmp, &ecs->another_trap,
1137 &ecs->stepping_through_solib_after_catch,
1138 &ecs->stepping_through_solib_catchpoints,
1139 &ecs->current_line, &ecs->current_symtab);
1141 inferior_ptid = ecs->ptid;
1145 adjust_pc_after_break (struct execution_control_state *ecs)
1147 CORE_ADDR breakpoint_pc;
1149 /* If this target does not decrement the PC after breakpoints, then
1150 we have nothing to do. */
1151 if (DECR_PC_AFTER_BREAK == 0)
1154 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1155 we aren't, just return.
1157 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1158 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1159 by software breakpoints should be handled through the normal breakpoint
1162 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1163 different signals (SIGILL or SIGEMT for instance), but it is less
1164 clear where the PC is pointing afterwards. It may not match
1165 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1166 these signals at breakpoints (the code has been in GDB since at least
1167 1992) so I can not guess how to handle them here.
1169 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1170 would have the PC after hitting a watchpoint affected by
1171 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1172 in GDB history, and it seems unlikely to be correct, so
1173 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1175 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1178 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1181 /* Find the location where (if we've hit a breakpoint) the
1182 breakpoint would be. */
1183 breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK;
1185 if (SOFTWARE_SINGLE_STEP_P ())
1187 /* When using software single-step, a SIGTRAP can only indicate
1188 an inserted breakpoint. This actually makes things
1190 if (singlestep_breakpoints_inserted_p)
1191 /* When software single stepping, the instruction at [prev_pc]
1192 is never a breakpoint, but the instruction following
1193 [prev_pc] (in program execution order) always is. Assume
1194 that following instruction was reached and hence a software
1195 breakpoint was hit. */
1196 write_pc_pid (breakpoint_pc, ecs->ptid);
1197 else if (software_breakpoint_inserted_here_p (breakpoint_pc))
1198 /* The inferior was free running (i.e., no single-step
1199 breakpoints inserted) and it hit a software breakpoint. */
1200 write_pc_pid (breakpoint_pc, ecs->ptid);
1204 /* When using hardware single-step, a SIGTRAP is reported for
1205 both a completed single-step and a software breakpoint. Need
1206 to differentiate between the two as the latter needs
1207 adjusting but the former does not. */
1208 if (currently_stepping (ecs))
1210 if (prev_pc == breakpoint_pc
1211 && software_breakpoint_inserted_here_p (breakpoint_pc))
1212 /* Hardware single-stepped a software breakpoint (as
1213 occures when the inferior is resumed with PC pointing
1214 at not-yet-hit software breakpoint). Since the
1215 breakpoint really is executed, the inferior needs to be
1216 backed up to the breakpoint address. */
1217 write_pc_pid (breakpoint_pc, ecs->ptid);
1221 if (software_breakpoint_inserted_here_p (breakpoint_pc))
1222 /* The inferior was free running (i.e., no hardware
1223 single-step and no possibility of a false SIGTRAP) and
1224 hit a software breakpoint. */
1225 write_pc_pid (breakpoint_pc, ecs->ptid);
1230 /* Given an execution control state that has been freshly filled in
1231 by an event from the inferior, figure out what it means and take
1232 appropriate action. */
1234 int stepped_after_stopped_by_watchpoint;
1237 handle_inferior_event (struct execution_control_state *ecs)
1239 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1240 thinking that the variable stepped_after_stopped_by_watchpoint
1241 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1242 defined in the file "config/pa/nm-hppah.h", accesses the variable
1243 indirectly. Mutter something rude about the HP merge. */
1244 int sw_single_step_trap_p = 0;
1245 int stopped_by_watchpoint = -1; /* Mark as unknown. */
1247 /* Cache the last pid/waitstatus. */
1248 target_last_wait_ptid = ecs->ptid;
1249 target_last_waitstatus = *ecs->wp;
1251 adjust_pc_after_break (ecs);
1253 switch (ecs->infwait_state)
1255 case infwait_thread_hop_state:
1256 /* Cancel the waiton_ptid. */
1257 ecs->waiton_ptid = pid_to_ptid (-1);
1258 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1259 is serviced in this loop, below. */
1260 if (ecs->enable_hw_watchpoints_after_wait)
1262 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1263 ecs->enable_hw_watchpoints_after_wait = 0;
1265 stepped_after_stopped_by_watchpoint = 0;
1268 case infwait_normal_state:
1269 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1270 is serviced in this loop, below. */
1271 if (ecs->enable_hw_watchpoints_after_wait)
1273 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1274 ecs->enable_hw_watchpoints_after_wait = 0;
1276 stepped_after_stopped_by_watchpoint = 0;
1279 case infwait_nullified_state:
1280 stepped_after_stopped_by_watchpoint = 0;
1283 case infwait_nonstep_watch_state:
1284 insert_breakpoints ();
1286 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1287 handle things like signals arriving and other things happening
1288 in combination correctly? */
1289 stepped_after_stopped_by_watchpoint = 1;
1293 internal_error (__FILE__, __LINE__, "bad switch");
1295 ecs->infwait_state = infwait_normal_state;
1297 flush_cached_frames ();
1299 /* If it's a new process, add it to the thread database */
1301 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1302 && !ptid_equal (ecs->ptid, minus_one_ptid)
1303 && !in_thread_list (ecs->ptid));
1305 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1306 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1308 add_thread (ecs->ptid);
1310 ui_out_text (uiout, "[New ");
1311 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1312 ui_out_text (uiout, "]\n");
1315 switch (ecs->ws.kind)
1317 case TARGET_WAITKIND_LOADED:
1318 /* Ignore gracefully during startup of the inferior, as it
1319 might be the shell which has just loaded some objects,
1320 otherwise add the symbols for the newly loaded objects. */
1322 if (stop_soon == NO_STOP_QUIETLY)
1324 /* Remove breakpoints, SOLIB_ADD might adjust
1325 breakpoint addresses via breakpoint_re_set. */
1326 if (breakpoints_inserted)
1327 remove_breakpoints ();
1329 /* Check for any newly added shared libraries if we're
1330 supposed to be adding them automatically. Switch
1331 terminal for any messages produced by
1332 breakpoint_re_set. */
1333 target_terminal_ours_for_output ();
1334 /* NOTE: cagney/2003-11-25: Make certain that the target
1335 stack's section table is kept up-to-date. Architectures,
1336 (e.g., PPC64), use the section table to perform
1337 operations such as address => section name and hence
1338 require the table to contain all sections (including
1339 those found in shared libraries). */
1340 /* NOTE: cagney/2003-11-25: Pass current_target and not
1341 exec_ops to SOLIB_ADD. This is because current GDB is
1342 only tooled to propagate section_table changes out from
1343 the "current_target" (see target_resize_to_sections), and
1344 not up from the exec stratum. This, of course, isn't
1345 right. "infrun.c" should only interact with the
1346 exec/process stratum, instead relying on the target stack
1347 to propagate relevant changes (stop, section table
1348 changed, ...) up to other layers. */
1349 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1350 target_terminal_inferior ();
1352 /* Reinsert breakpoints and continue. */
1353 if (breakpoints_inserted)
1354 insert_breakpoints ();
1357 resume (0, TARGET_SIGNAL_0);
1358 prepare_to_wait (ecs);
1361 case TARGET_WAITKIND_SPURIOUS:
1362 resume (0, TARGET_SIGNAL_0);
1363 prepare_to_wait (ecs);
1366 case TARGET_WAITKIND_EXITED:
1367 target_terminal_ours (); /* Must do this before mourn anyway */
1368 print_stop_reason (EXITED, ecs->ws.value.integer);
1370 /* Record the exit code in the convenience variable $_exitcode, so
1371 that the user can inspect this again later. */
1372 set_internalvar (lookup_internalvar ("_exitcode"),
1373 value_from_longest (builtin_type_int,
1374 (LONGEST) ecs->ws.value.integer));
1375 gdb_flush (gdb_stdout);
1376 target_mourn_inferior ();
1377 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1378 stop_print_frame = 0;
1379 stop_stepping (ecs);
1382 case TARGET_WAITKIND_SIGNALLED:
1383 stop_print_frame = 0;
1384 stop_signal = ecs->ws.value.sig;
1385 target_terminal_ours (); /* Must do this before mourn anyway */
1387 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1388 reach here unless the inferior is dead. However, for years
1389 target_kill() was called here, which hints that fatal signals aren't
1390 really fatal on some systems. If that's true, then some changes
1392 target_mourn_inferior ();
1394 print_stop_reason (SIGNAL_EXITED, stop_signal);
1395 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1396 stop_stepping (ecs);
1399 /* The following are the only cases in which we keep going;
1400 the above cases end in a continue or goto. */
1401 case TARGET_WAITKIND_FORKED:
1402 case TARGET_WAITKIND_VFORKED:
1403 stop_signal = TARGET_SIGNAL_TRAP;
1404 pending_follow.kind = ecs->ws.kind;
1406 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1407 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1409 stop_pc = read_pc ();
1411 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1413 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1415 /* If no catchpoint triggered for this, then keep going. */
1416 if (ecs->random_signal)
1418 stop_signal = TARGET_SIGNAL_0;
1422 goto process_event_stop_test;
1424 case TARGET_WAITKIND_EXECD:
1425 stop_signal = TARGET_SIGNAL_TRAP;
1427 /* NOTE drow/2002-12-05: This code should be pushed down into the
1428 target_wait function. Until then following vfork on HP/UX 10.20
1429 is probably broken by this. Of course, it's broken anyway. */
1430 /* Is this a target which reports multiple exec events per actual
1431 call to exec()? (HP-UX using ptrace does, for example.) If so,
1432 ignore all but the last one. Just resume the exec'r, and wait
1433 for the next exec event. */
1434 if (inferior_ignoring_leading_exec_events)
1436 inferior_ignoring_leading_exec_events--;
1437 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1438 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1440 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1441 prepare_to_wait (ecs);
1444 inferior_ignoring_leading_exec_events =
1445 target_reported_exec_events_per_exec_call () - 1;
1447 pending_follow.execd_pathname =
1448 savestring (ecs->ws.value.execd_pathname,
1449 strlen (ecs->ws.value.execd_pathname));
1451 /* This causes the eventpoints and symbol table to be reset. Must
1452 do this now, before trying to determine whether to stop. */
1453 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1454 xfree (pending_follow.execd_pathname);
1456 stop_pc = read_pc_pid (ecs->ptid);
1457 ecs->saved_inferior_ptid = inferior_ptid;
1458 inferior_ptid = ecs->ptid;
1460 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1462 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1463 inferior_ptid = ecs->saved_inferior_ptid;
1465 /* If no catchpoint triggered for this, then keep going. */
1466 if (ecs->random_signal)
1468 stop_signal = TARGET_SIGNAL_0;
1472 goto process_event_stop_test;
1474 /* These syscall events are returned on HP-UX, as part of its
1475 implementation of page-protection-based "hardware" watchpoints.
1476 HP-UX has unfortunate interactions between page-protections and
1477 some system calls. Our solution is to disable hardware watches
1478 when a system call is entered, and reenable them when the syscall
1479 completes. The downside of this is that we may miss the precise
1480 point at which a watched piece of memory is modified. "Oh well."
1482 Note that we may have multiple threads running, which may each
1483 enter syscalls at roughly the same time. Since we don't have a
1484 good notion currently of whether a watched piece of memory is
1485 thread-private, we'd best not have any page-protections active
1486 when any thread is in a syscall. Thus, we only want to reenable
1487 hardware watches when no threads are in a syscall.
1489 Also, be careful not to try to gather much state about a thread
1490 that's in a syscall. It's frequently a losing proposition. */
1491 case TARGET_WAITKIND_SYSCALL_ENTRY:
1492 number_of_threads_in_syscalls++;
1493 if (number_of_threads_in_syscalls == 1)
1495 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1497 resume (0, TARGET_SIGNAL_0);
1498 prepare_to_wait (ecs);
1501 /* Before examining the threads further, step this thread to
1502 get it entirely out of the syscall. (We get notice of the
1503 event when the thread is just on the verge of exiting a
1504 syscall. Stepping one instruction seems to get it back
1507 Note that although the logical place to reenable h/w watches
1508 is here, we cannot. We cannot reenable them before stepping
1509 the thread (this causes the next wait on the thread to hang).
1511 Nor can we enable them after stepping until we've done a wait.
1512 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1513 here, which will be serviced immediately after the target
1515 case TARGET_WAITKIND_SYSCALL_RETURN:
1516 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1518 if (number_of_threads_in_syscalls > 0)
1520 number_of_threads_in_syscalls--;
1521 ecs->enable_hw_watchpoints_after_wait =
1522 (number_of_threads_in_syscalls == 0);
1524 prepare_to_wait (ecs);
1527 case TARGET_WAITKIND_STOPPED:
1528 stop_signal = ecs->ws.value.sig;
1531 /* We had an event in the inferior, but we are not interested
1532 in handling it at this level. The lower layers have already
1533 done what needs to be done, if anything.
1535 One of the possible circumstances for this is when the
1536 inferior produces output for the console. The inferior has
1537 not stopped, and we are ignoring the event. Another possible
1538 circumstance is any event which the lower level knows will be
1539 reported multiple times without an intervening resume. */
1540 case TARGET_WAITKIND_IGNORE:
1541 prepare_to_wait (ecs);
1545 /* We may want to consider not doing a resume here in order to give
1546 the user a chance to play with the new thread. It might be good
1547 to make that a user-settable option. */
1549 /* At this point, all threads are stopped (happens automatically in
1550 either the OS or the native code). Therefore we need to continue
1551 all threads in order to make progress. */
1552 if (ecs->new_thread_event)
1554 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1555 prepare_to_wait (ecs);
1559 stop_pc = read_pc_pid (ecs->ptid);
1561 if (stepping_past_singlestep_breakpoint)
1563 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1564 && singlestep_breakpoints_inserted_p);
1565 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1566 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1568 stepping_past_singlestep_breakpoint = 0;
1570 /* We've either finished single-stepping past the single-step
1571 breakpoint, or stopped for some other reason. It would be nice if
1572 we could tell, but we can't reliably. */
1573 if (stop_signal == TARGET_SIGNAL_TRAP)
1575 /* Pull the single step breakpoints out of the target. */
1576 SOFTWARE_SINGLE_STEP (0, 0);
1577 singlestep_breakpoints_inserted_p = 0;
1579 ecs->random_signal = 0;
1581 ecs->ptid = saved_singlestep_ptid;
1582 context_switch (ecs);
1583 if (deprecated_context_hook)
1584 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1586 resume (1, TARGET_SIGNAL_0);
1587 prepare_to_wait (ecs);
1592 stepping_past_singlestep_breakpoint = 0;
1594 /* See if a thread hit a thread-specific breakpoint that was meant for
1595 another thread. If so, then step that thread past the breakpoint,
1598 if (stop_signal == TARGET_SIGNAL_TRAP)
1600 int thread_hop_needed = 0;
1602 /* Check if a regular breakpoint has been hit before checking
1603 for a potential single step breakpoint. Otherwise, GDB will
1604 not see this breakpoint hit when stepping onto breakpoints. */
1605 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1607 ecs->random_signal = 0;
1608 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1609 thread_hop_needed = 1;
1611 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1613 ecs->random_signal = 0;
1614 /* The call to in_thread_list is necessary because PTIDs sometimes
1615 change when we go from single-threaded to multi-threaded. If
1616 the singlestep_ptid is still in the list, assume that it is
1617 really different from ecs->ptid. */
1618 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1619 && in_thread_list (singlestep_ptid))
1621 thread_hop_needed = 1;
1622 stepping_past_singlestep_breakpoint = 1;
1623 saved_singlestep_ptid = singlestep_ptid;
1627 if (thread_hop_needed)
1631 /* Saw a breakpoint, but it was hit by the wrong thread.
1634 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1636 /* Pull the single step breakpoints out of the target. */
1637 SOFTWARE_SINGLE_STEP (0, 0);
1638 singlestep_breakpoints_inserted_p = 0;
1641 remove_status = remove_breakpoints ();
1642 /* Did we fail to remove breakpoints? If so, try
1643 to set the PC past the bp. (There's at least
1644 one situation in which we can fail to remove
1645 the bp's: On HP-UX's that use ttrace, we can't
1646 change the address space of a vforking child
1647 process until the child exits (well, okay, not
1648 then either :-) or execs. */
1649 if (remove_status != 0)
1651 /* FIXME! This is obviously non-portable! */
1652 write_pc_pid (stop_pc + 4, ecs->ptid);
1653 /* We need to restart all the threads now,
1654 * unles we're running in scheduler-locked mode.
1655 * Use currently_stepping to determine whether to
1658 /* FIXME MVS: is there any reason not to call resume()? */
1659 if (scheduler_mode == schedlock_on)
1660 target_resume (ecs->ptid,
1661 currently_stepping (ecs), TARGET_SIGNAL_0);
1663 target_resume (RESUME_ALL,
1664 currently_stepping (ecs), TARGET_SIGNAL_0);
1665 prepare_to_wait (ecs);
1670 breakpoints_inserted = 0;
1671 if (!ptid_equal (inferior_ptid, ecs->ptid))
1672 context_switch (ecs);
1673 ecs->waiton_ptid = ecs->ptid;
1674 ecs->wp = &(ecs->ws);
1675 ecs->another_trap = 1;
1677 ecs->infwait_state = infwait_thread_hop_state;
1679 registers_changed ();
1683 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1685 sw_single_step_trap_p = 1;
1686 ecs->random_signal = 0;
1690 ecs->random_signal = 1;
1692 /* See if something interesting happened to the non-current thread. If
1693 so, then switch to that thread. */
1694 if (!ptid_equal (ecs->ptid, inferior_ptid))
1696 context_switch (ecs);
1698 if (deprecated_context_hook)
1699 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1701 flush_cached_frames ();
1704 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1706 /* Pull the single step breakpoints out of the target. */
1707 SOFTWARE_SINGLE_STEP (0, 0);
1708 singlestep_breakpoints_inserted_p = 0;
1711 /* If PC is pointing at a nullified instruction, then step beyond
1712 it so that the user won't be confused when GDB appears to be ready
1715 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1716 if (INSTRUCTION_NULLIFIED)
1718 registers_changed ();
1719 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1721 /* We may have received a signal that we want to pass to
1722 the inferior; therefore, we must not clobber the waitstatus
1725 ecs->infwait_state = infwait_nullified_state;
1726 ecs->waiton_ptid = ecs->ptid;
1727 ecs->wp = &(ecs->tmpstatus);
1728 prepare_to_wait (ecs);
1732 /* It may not be necessary to disable the watchpoint to stop over
1733 it. For example, the PA can (with some kernel cooperation)
1734 single step over a watchpoint without disabling the watchpoint. */
1735 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1738 prepare_to_wait (ecs);
1742 /* It is far more common to need to disable a watchpoint to step
1743 the inferior over it. FIXME. What else might a debug
1744 register or page protection watchpoint scheme need here? */
1745 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1747 /* At this point, we are stopped at an instruction which has
1748 attempted to write to a piece of memory under control of
1749 a watchpoint. The instruction hasn't actually executed
1750 yet. If we were to evaluate the watchpoint expression
1751 now, we would get the old value, and therefore no change
1752 would seem to have occurred.
1754 In order to make watchpoints work `right', we really need
1755 to complete the memory write, and then evaluate the
1756 watchpoint expression. The following code does that by
1757 removing the watchpoint (actually, all watchpoints and
1758 breakpoints), single-stepping the target, re-inserting
1759 watchpoints, and then falling through to let normal
1760 single-step processing handle proceed. Since this
1761 includes evaluating watchpoints, things will come to a
1762 stop in the correct manner. */
1764 remove_breakpoints ();
1765 registers_changed ();
1766 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1768 ecs->waiton_ptid = ecs->ptid;
1769 ecs->wp = &(ecs->ws);
1770 ecs->infwait_state = infwait_nonstep_watch_state;
1771 prepare_to_wait (ecs);
1775 /* It may be possible to simply continue after a watchpoint. */
1776 if (HAVE_CONTINUABLE_WATCHPOINT)
1777 stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws);
1779 ecs->stop_func_start = 0;
1780 ecs->stop_func_end = 0;
1781 ecs->stop_func_name = 0;
1782 /* Don't care about return value; stop_func_start and stop_func_name
1783 will both be 0 if it doesn't work. */
1784 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1785 &ecs->stop_func_start, &ecs->stop_func_end);
1786 ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET;
1787 ecs->another_trap = 0;
1788 bpstat_clear (&stop_bpstat);
1790 stop_stack_dummy = 0;
1791 stop_print_frame = 1;
1792 ecs->random_signal = 0;
1793 stopped_by_random_signal = 0;
1794 breakpoints_failed = 0;
1796 /* Look at the cause of the stop, and decide what to do.
1797 The alternatives are:
1798 1) break; to really stop and return to the debugger,
1799 2) drop through to start up again
1800 (set ecs->another_trap to 1 to single step once)
1801 3) set ecs->random_signal to 1, and the decision between 1 and 2
1802 will be made according to the signal handling tables. */
1804 /* First, distinguish signals caused by the debugger from signals
1805 that have to do with the program's own actions. Note that
1806 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1807 on the operating system version. Here we detect when a SIGILL or
1808 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1809 something similar for SIGSEGV, since a SIGSEGV will be generated
1810 when we're trying to execute a breakpoint instruction on a
1811 non-executable stack. This happens for call dummy breakpoints
1812 for architectures like SPARC that place call dummies on the
1815 if (stop_signal == TARGET_SIGNAL_TRAP
1816 || (breakpoints_inserted
1817 && (stop_signal == TARGET_SIGNAL_ILL
1818 || stop_signal == TARGET_SIGNAL_SEGV
1819 || stop_signal == TARGET_SIGNAL_EMT))
1820 || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1822 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1824 stop_print_frame = 0;
1825 stop_stepping (ecs);
1829 /* This is originated from start_remote(), start_inferior() and
1830 shared libraries hook functions. */
1831 if (stop_soon == STOP_QUIETLY)
1833 stop_stepping (ecs);
1837 /* This originates from attach_command(). We need to overwrite
1838 the stop_signal here, because some kernels don't ignore a
1839 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1840 See more comments in inferior.h. */
1841 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1843 stop_stepping (ecs);
1844 if (stop_signal == TARGET_SIGNAL_STOP)
1845 stop_signal = TARGET_SIGNAL_0;
1849 /* Don't even think about breakpoints if just proceeded over a
1851 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1852 bpstat_clear (&stop_bpstat);
1855 /* See if there is a breakpoint at the current PC. */
1856 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid,
1857 stopped_by_watchpoint);
1859 /* Following in case break condition called a
1861 stop_print_frame = 1;
1864 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1865 at one stage in the past included checks for an inferior
1866 function call's call dummy's return breakpoint. The original
1867 comment, that went with the test, read:
1869 ``End of a stack dummy. Some systems (e.g. Sony news) give
1870 another signal besides SIGTRAP, so check here as well as
1873 If someone ever tries to get get call dummys on a
1874 non-executable stack to work (where the target would stop
1875 with something like a SIGSEGV), then those tests might need
1876 to be re-instated. Given, however, that the tests were only
1877 enabled when momentary breakpoints were not being used, I
1878 suspect that it won't be the case.
1880 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1881 be necessary for call dummies on a non-executable stack on
1884 if (stop_signal == TARGET_SIGNAL_TRAP)
1886 = !(bpstat_explains_signal (stop_bpstat)
1888 || (step_range_end && step_resume_breakpoint == NULL));
1891 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1892 if (!ecs->random_signal)
1893 stop_signal = TARGET_SIGNAL_TRAP;
1897 /* When we reach this point, we've pretty much decided
1898 that the reason for stopping must've been a random
1899 (unexpected) signal. */
1902 ecs->random_signal = 1;
1904 process_event_stop_test:
1905 /* For the program's own signals, act according to
1906 the signal handling tables. */
1908 if (ecs->random_signal)
1910 /* Signal not for debugging purposes. */
1913 stopped_by_random_signal = 1;
1915 if (signal_print[stop_signal])
1918 target_terminal_ours_for_output ();
1919 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
1921 if (signal_stop[stop_signal])
1923 stop_stepping (ecs);
1926 /* If not going to stop, give terminal back
1927 if we took it away. */
1929 target_terminal_inferior ();
1931 /* Clear the signal if it should not be passed. */
1932 if (signal_program[stop_signal] == 0)
1933 stop_signal = TARGET_SIGNAL_0;
1935 if (step_range_end != 0
1936 && stop_signal != TARGET_SIGNAL_0
1937 && stop_pc >= step_range_start && stop_pc < step_range_end
1938 && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id))
1940 /* The inferior is about to take a signal that will take it
1941 out of the single step range. Set a breakpoint at the
1942 current PC (which is presumably where the signal handler
1943 will eventually return) and then allow the inferior to
1946 Note that this is only needed for a signal delivered
1947 while in the single-step range. Nested signals aren't a
1948 problem as they eventually all return. */
1949 insert_step_resume_breakpoint (get_current_frame (), ecs);
1955 /* Handle cases caused by hitting a breakpoint. */
1957 CORE_ADDR jmp_buf_pc;
1958 struct bpstat_what what;
1960 what = bpstat_what (stop_bpstat);
1962 if (what.call_dummy)
1964 stop_stack_dummy = 1;
1967 switch (what.main_action)
1969 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
1970 /* If we hit the breakpoint at longjmp, disable it for the
1971 duration of this command. Then, install a temporary
1972 breakpoint at the target of the jmp_buf. */
1973 disable_longjmp_breakpoint ();
1974 remove_breakpoints ();
1975 breakpoints_inserted = 0;
1976 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
1982 /* Need to blow away step-resume breakpoint, as it
1983 interferes with us */
1984 if (step_resume_breakpoint != NULL)
1986 delete_step_resume_breakpoint (&step_resume_breakpoint);
1989 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
1990 ecs->handling_longjmp = 1; /* FIXME */
1994 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
1995 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
1996 remove_breakpoints ();
1997 breakpoints_inserted = 0;
1998 disable_longjmp_breakpoint ();
1999 ecs->handling_longjmp = 0; /* FIXME */
2000 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2002 /* else fallthrough */
2004 case BPSTAT_WHAT_SINGLE:
2005 if (breakpoints_inserted)
2007 remove_breakpoints ();
2009 breakpoints_inserted = 0;
2010 ecs->another_trap = 1;
2011 /* Still need to check other stuff, at least the case
2012 where we are stepping and step out of the right range. */
2015 case BPSTAT_WHAT_STOP_NOISY:
2016 stop_print_frame = 1;
2018 /* We are about to nuke the step_resume_breakpointt via the
2019 cleanup chain, so no need to worry about it here. */
2021 stop_stepping (ecs);
2024 case BPSTAT_WHAT_STOP_SILENT:
2025 stop_print_frame = 0;
2027 /* We are about to nuke the step_resume_breakpoin via the
2028 cleanup chain, so no need to worry about it here. */
2030 stop_stepping (ecs);
2033 case BPSTAT_WHAT_STEP_RESUME:
2034 /* This proably demands a more elegant solution, but, yeah
2037 This function's use of the simple variable
2038 step_resume_breakpoint doesn't seem to accomodate
2039 simultaneously active step-resume bp's, although the
2040 breakpoint list certainly can.
2042 If we reach here and step_resume_breakpoint is already
2043 NULL, then apparently we have multiple active
2044 step-resume bp's. We'll just delete the breakpoint we
2045 stopped at, and carry on.
2047 Correction: what the code currently does is delete a
2048 step-resume bp, but it makes no effort to ensure that
2049 the one deleted is the one currently stopped at. MVS */
2051 if (step_resume_breakpoint == NULL)
2053 step_resume_breakpoint =
2054 bpstat_find_step_resume_breakpoint (stop_bpstat);
2056 delete_step_resume_breakpoint (&step_resume_breakpoint);
2059 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2060 /* If were waiting for a trap, hitting the step_resume_break
2061 doesn't count as getting it. */
2063 ecs->another_trap = 1;
2066 case BPSTAT_WHAT_CHECK_SHLIBS:
2067 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2070 /* Remove breakpoints, we eventually want to step over the
2071 shlib event breakpoint, and SOLIB_ADD might adjust
2072 breakpoint addresses via breakpoint_re_set. */
2073 if (breakpoints_inserted)
2074 remove_breakpoints ();
2075 breakpoints_inserted = 0;
2077 /* Check for any newly added shared libraries if we're
2078 supposed to be adding them automatically. Switch
2079 terminal for any messages produced by
2080 breakpoint_re_set. */
2081 target_terminal_ours_for_output ();
2082 /* NOTE: cagney/2003-11-25: Make certain that the target
2083 stack's section table is kept up-to-date. Architectures,
2084 (e.g., PPC64), use the section table to perform
2085 operations such as address => section name and hence
2086 require the table to contain all sections (including
2087 those found in shared libraries). */
2088 /* NOTE: cagney/2003-11-25: Pass current_target and not
2089 exec_ops to SOLIB_ADD. This is because current GDB is
2090 only tooled to propagate section_table changes out from
2091 the "current_target" (see target_resize_to_sections), and
2092 not up from the exec stratum. This, of course, isn't
2093 right. "infrun.c" should only interact with the
2094 exec/process stratum, instead relying on the target stack
2095 to propagate relevant changes (stop, section table
2096 changed, ...) up to other layers. */
2097 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2098 target_terminal_inferior ();
2100 /* Try to reenable shared library breakpoints, additional
2101 code segments in shared libraries might be mapped in now. */
2102 re_enable_breakpoints_in_shlibs ();
2104 /* If requested, stop when the dynamic linker notifies
2105 gdb of events. This allows the user to get control
2106 and place breakpoints in initializer routines for
2107 dynamically loaded objects (among other things). */
2108 if (stop_on_solib_events || stop_stack_dummy)
2110 stop_stepping (ecs);
2114 /* If we stopped due to an explicit catchpoint, then the
2115 (see above) call to SOLIB_ADD pulled in any symbols
2116 from a newly-loaded library, if appropriate.
2118 We do want the inferior to stop, but not where it is
2119 now, which is in the dynamic linker callback. Rather,
2120 we would like it stop in the user's program, just after
2121 the call that caused this catchpoint to trigger. That
2122 gives the user a more useful vantage from which to
2123 examine their program's state. */
2124 else if (what.main_action
2125 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2127 /* ??rehrauer: If I could figure out how to get the
2128 right return PC from here, we could just set a temp
2129 breakpoint and resume. I'm not sure we can without
2130 cracking open the dld's shared libraries and sniffing
2131 their unwind tables and text/data ranges, and that's
2132 not a terribly portable notion.
2134 Until that time, we must step the inferior out of the
2135 dld callback, and also out of the dld itself (and any
2136 code or stubs in libdld.sl, such as "shl_load" and
2137 friends) until we reach non-dld code. At that point,
2138 we can stop stepping. */
2139 bpstat_get_triggered_catchpoints (stop_bpstat,
2141 stepping_through_solib_catchpoints);
2142 ecs->stepping_through_solib_after_catch = 1;
2144 /* Be sure to lift all breakpoints, so the inferior does
2145 actually step past this point... */
2146 ecs->another_trap = 1;
2151 /* We want to step over this breakpoint, then keep going. */
2152 ecs->another_trap = 1;
2159 case BPSTAT_WHAT_LAST:
2160 /* Not a real code, but listed here to shut up gcc -Wall. */
2162 case BPSTAT_WHAT_KEEP_CHECKING:
2167 /* We come here if we hit a breakpoint but should not
2168 stop for it. Possibly we also were stepping
2169 and should stop for that. So fall through and
2170 test for stepping. But, if not stepping,
2173 /* Are we stepping to get the inferior out of the dynamic
2174 linker's hook (and possibly the dld itself) after catching
2176 if (ecs->stepping_through_solib_after_catch)
2178 #if defined(SOLIB_ADD)
2179 /* Have we reached our destination? If not, keep going. */
2180 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2182 ecs->another_trap = 1;
2187 /* Else, stop and report the catchpoint(s) whose triggering
2188 caused us to begin stepping. */
2189 ecs->stepping_through_solib_after_catch = 0;
2190 bpstat_clear (&stop_bpstat);
2191 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2192 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2193 stop_print_frame = 1;
2194 stop_stepping (ecs);
2198 if (step_resume_breakpoint)
2200 /* Having a step-resume breakpoint overrides anything
2201 else having to do with stepping commands until
2202 that breakpoint is reached. */
2207 if (step_range_end == 0)
2209 /* Likewise if we aren't even stepping. */
2214 /* If stepping through a line, keep going if still within it.
2216 Note that step_range_end is the address of the first instruction
2217 beyond the step range, and NOT the address of the last instruction
2219 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2225 /* We stepped out of the stepping range. */
2227 /* If we are stepping at the source level and entered the runtime
2228 loader dynamic symbol resolution code, we keep on single stepping
2229 until we exit the run time loader code and reach the callee's
2231 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2232 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2234 CORE_ADDR pc_after_resolver =
2235 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2237 if (pc_after_resolver)
2239 /* Set up a step-resume breakpoint at the address
2240 indicated by SKIP_SOLIB_RESOLVER. */
2241 struct symtab_and_line sr_sal;
2243 sr_sal.pc = pc_after_resolver;
2245 check_for_old_step_resume_breakpoint ();
2246 step_resume_breakpoint =
2247 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2248 if (breakpoints_inserted)
2249 insert_breakpoints ();
2256 if (step_range_end != 1
2257 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2258 || step_over_calls == STEP_OVER_ALL)
2259 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2261 /* The inferior, while doing a "step" or "next", has ended up in
2262 a signal trampoline (either by a signal being delivered or by
2263 the signal handler returning). Just single-step until the
2264 inferior leaves the trampoline (either by calling the handler
2270 if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id))
2272 /* It's a subroutine call. */
2273 CORE_ADDR real_stop_pc;
2275 if ((step_over_calls == STEP_OVER_NONE)
2276 || ((step_range_end == 1)
2277 && in_prologue (prev_pc, ecs->stop_func_start)))
2279 /* I presume that step_over_calls is only 0 when we're
2280 supposed to be stepping at the assembly language level
2281 ("stepi"). Just stop. */
2282 /* Also, maybe we just did a "nexti" inside a prolog, so we
2283 thought it was a subroutine call but it was not. Stop as
2286 print_stop_reason (END_STEPPING_RANGE, 0);
2287 stop_stepping (ecs);
2291 #ifdef DEPRECATED_IGNORE_HELPER_CALL
2292 /* On MIPS16, a function that returns a floating point value may
2293 call a library helper function to copy the return value to a
2294 floating point register. The DEPRECATED_IGNORE_HELPER_CALL
2295 macro returns non-zero if we should ignore (i.e. step over)
2296 this function call. */
2297 /* FIXME: cagney/2004-07-21: These custom ``ignore frame when
2298 stepping'' function attributes (SIGTRAMP_FRAME,
2299 DEPRECATED_IGNORE_HELPER_CALL, SKIP_TRAMPOLINE_CODE,
2300 skip_language_trampoline frame, et.al.) need to be replaced
2301 with generic attributes bound to the frame's function. */
2302 if (DEPRECATED_IGNORE_HELPER_CALL (stop_pc))
2304 /* We're doing a "next", set a breakpoint at callee's return
2305 address (the address at which the caller will
2307 insert_step_resume_breakpoint (get_prev_frame
2308 (get_current_frame ()), ecs);
2313 if (step_over_calls == STEP_OVER_ALL)
2315 /* We're doing a "next", set a breakpoint at callee's return
2316 address (the address at which the caller will
2318 insert_step_resume_breakpoint (get_prev_frame
2319 (get_current_frame ()), ecs);
2324 /* If we are in a function call trampoline (a stub between the
2325 calling routine and the real function), locate the real
2326 function. That's what tells us (a) whether we want to step
2327 into it at all, and (b) what prologue we want to run to the
2328 end of, if we do step into it. */
2329 real_stop_pc = skip_language_trampoline (stop_pc);
2330 if (real_stop_pc == 0)
2331 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2332 if (real_stop_pc != 0)
2333 ecs->stop_func_start = real_stop_pc;
2335 if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start))
2337 struct symtab_and_line sr_sal;
2339 sr_sal.pc = ecs->stop_func_start;
2341 check_for_old_step_resume_breakpoint ();
2342 step_resume_breakpoint =
2343 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2344 if (breakpoints_inserted)
2345 insert_breakpoints ();
2351 /* If we have line number information for the function we are
2352 thinking of stepping into, step into it.
2354 If there are several symtabs at that PC (e.g. with include
2355 files), just want to know whether *any* of them have line
2356 numbers. find_pc_line handles this. */
2358 struct symtab_and_line tmp_sal;
2360 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2361 if (tmp_sal.line != 0)
2363 step_into_function (ecs);
2368 /* If we have no line number and the step-stop-if-no-debug is
2369 set, we stop the step so that the user has a chance to switch
2370 in assembly mode. */
2371 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2374 print_stop_reason (END_STEPPING_RANGE, 0);
2375 stop_stepping (ecs);
2379 /* Set a breakpoint at callee's return address (the address at
2380 which the caller will resume). */
2381 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()),
2387 /* If we're in the return path from a shared library trampoline,
2388 we want to proceed through the trampoline when stepping. */
2389 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2391 /* Determine where this trampoline returns. */
2392 CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2394 /* Only proceed through if we know where it's going. */
2397 /* And put the step-breakpoint there and go until there. */
2398 struct symtab_and_line sr_sal;
2400 init_sal (&sr_sal); /* initialize to zeroes */
2401 sr_sal.pc = real_stop_pc;
2402 sr_sal.section = find_pc_overlay (sr_sal.pc);
2403 /* Do not specify what the fp should be when we stop
2404 since on some machines the prologue
2405 is where the new fp value is established. */
2406 check_for_old_step_resume_breakpoint ();
2407 step_resume_breakpoint =
2408 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2409 if (breakpoints_inserted)
2410 insert_breakpoints ();
2412 /* Restart without fiddling with the step ranges or
2419 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2420 the trampoline processing logic, however, there are some trampolines
2421 that have no names, so we should do trampoline handling first. */
2422 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2423 && ecs->stop_func_name == NULL)
2425 /* The inferior just stepped into, or returned to, an
2426 undebuggable function (where there is no symbol, not even a
2427 minimal symbol, corresponding to the address where the
2428 inferior stopped). Since we want to skip this kind of code,
2429 we keep going until the inferior returns from this
2431 if (step_stop_if_no_debug)
2433 /* If we have no line number and the step-stop-if-no-debug
2434 is set, we stop the step so that the user has a chance to
2435 switch in assembly mode. */
2437 print_stop_reason (END_STEPPING_RANGE, 0);
2438 stop_stepping (ecs);
2443 /* Set a breakpoint at callee's return address (the address
2444 at which the caller will resume). */
2445 insert_step_resume_breakpoint (get_prev_frame
2446 (get_current_frame ()), ecs);
2452 if (step_range_end == 1)
2454 /* It is stepi or nexti. We always want to stop stepping after
2457 print_stop_reason (END_STEPPING_RANGE, 0);
2458 stop_stepping (ecs);
2462 ecs->sal = find_pc_line (stop_pc, 0);
2464 if (ecs->sal.line == 0)
2466 /* We have no line number information. That means to stop
2467 stepping (does this always happen right after one instruction,
2468 when we do "s" in a function with no line numbers,
2469 or can this happen as a result of a return or longjmp?). */
2471 print_stop_reason (END_STEPPING_RANGE, 0);
2472 stop_stepping (ecs);
2476 if ((stop_pc == ecs->sal.pc)
2477 && (ecs->current_line != ecs->sal.line
2478 || ecs->current_symtab != ecs->sal.symtab))
2480 /* We are at the start of a different line. So stop. Note that
2481 we don't stop if we step into the middle of a different line.
2482 That is said to make things like for (;;) statements work
2485 print_stop_reason (END_STEPPING_RANGE, 0);
2486 stop_stepping (ecs);
2490 /* We aren't done stepping.
2492 Optimize by setting the stepping range to the line.
2493 (We might not be in the original line, but if we entered a
2494 new line in mid-statement, we continue stepping. This makes
2495 things like for(;;) statements work better.) */
2497 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2499 /* If this is the last line of the function, don't keep stepping
2500 (it would probably step us out of the function).
2501 This is particularly necessary for a one-line function,
2502 in which after skipping the prologue we better stop even though
2503 we will be in mid-line. */
2505 print_stop_reason (END_STEPPING_RANGE, 0);
2506 stop_stepping (ecs);
2509 step_range_start = ecs->sal.pc;
2510 step_range_end = ecs->sal.end;
2511 step_frame_id = get_frame_id (get_current_frame ());
2512 ecs->current_line = ecs->sal.line;
2513 ecs->current_symtab = ecs->sal.symtab;
2515 /* In the case where we just stepped out of a function into the
2516 middle of a line of the caller, continue stepping, but
2517 step_frame_id must be modified to current frame */
2519 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2520 generous. It will trigger on things like a step into a frameless
2521 stackless leaf function. I think the logic should instead look
2522 at the unwound frame ID has that should give a more robust
2523 indication of what happened. */
2524 if (step - ID == current - ID)
2525 still stepping in same function;
2526 else if (step - ID == unwind (current - ID))
2527 stepped into a function;
2529 stepped out of a function;
2530 /* Of course this assumes that the frame ID unwind code is robust
2531 and we're willing to introduce frame unwind logic into this
2532 function. Fortunately, those days are nearly upon us. */
2535 struct frame_id current_frame = get_frame_id (get_current_frame ());
2536 if (!(frame_id_inner (current_frame, step_frame_id)))
2537 step_frame_id = current_frame;
2543 /* Are we in the middle of stepping? */
2546 currently_stepping (struct execution_control_state *ecs)
2548 return ((!ecs->handling_longjmp
2549 && ((step_range_end && step_resume_breakpoint == NULL)
2551 || ecs->stepping_through_solib_after_catch
2552 || bpstat_should_step ());
2555 /* Subroutine call with source code we should not step over. Do step
2556 to the first line of code in it. */
2559 step_into_function (struct execution_control_state *ecs)
2562 struct symtab_and_line sr_sal;
2564 s = find_pc_symtab (stop_pc);
2565 if (s && s->language != language_asm)
2566 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2568 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2569 /* Use the step_resume_break to step until the end of the prologue,
2570 even if that involves jumps (as it seems to on the vax under
2572 /* If the prologue ends in the middle of a source line, continue to
2573 the end of that source line (if it is still within the function).
2574 Otherwise, just go to end of prologue. */
2576 && ecs->sal.pc != ecs->stop_func_start
2577 && ecs->sal.end < ecs->stop_func_end)
2578 ecs->stop_func_start = ecs->sal.end;
2580 /* Architectures which require breakpoint adjustment might not be able
2581 to place a breakpoint at the computed address. If so, the test
2582 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2583 ecs->stop_func_start to an address at which a breakpoint may be
2584 legitimately placed.
2586 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2587 made, GDB will enter an infinite loop when stepping through
2588 optimized code consisting of VLIW instructions which contain
2589 subinstructions corresponding to different source lines. On
2590 FR-V, it's not permitted to place a breakpoint on any but the
2591 first subinstruction of a VLIW instruction. When a breakpoint is
2592 set, GDB will adjust the breakpoint address to the beginning of
2593 the VLIW instruction. Thus, we need to make the corresponding
2594 adjustment here when computing the stop address. */
2596 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2598 ecs->stop_func_start
2599 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2600 ecs->stop_func_start);
2603 if (ecs->stop_func_start == stop_pc)
2605 /* We are already there: stop now. */
2607 print_stop_reason (END_STEPPING_RANGE, 0);
2608 stop_stepping (ecs);
2613 /* Put the step-breakpoint there and go until there. */
2614 init_sal (&sr_sal); /* initialize to zeroes */
2615 sr_sal.pc = ecs->stop_func_start;
2616 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2617 /* Do not specify what the fp should be when we stop since on
2618 some machines the prologue is where the new fp value is
2620 check_for_old_step_resume_breakpoint ();
2621 step_resume_breakpoint =
2622 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2623 if (breakpoints_inserted)
2624 insert_breakpoints ();
2626 /* And make sure stepping stops right away then. */
2627 step_range_end = step_range_start;
2632 /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used
2633 to skip a function (next, skip-no-debug) or signal. It's assumed
2634 that the function/signal handler being skipped eventually returns
2635 to the breakpoint inserted at RETURN_FRAME.pc.
2637 For the skip-function case, the function may have been reached by
2638 either single stepping a call / return / signal-return instruction,
2639 or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs
2640 to the skip-function's caller.
2642 For the signals case, this is called with the interrupted
2643 function's frame. The signal handler, when it returns, will resume
2644 the interrupted function at RETURN_FRAME.pc. */
2647 insert_step_resume_breakpoint (struct frame_info *return_frame,
2648 struct execution_control_state *ecs)
2650 struct symtab_and_line sr_sal;
2652 init_sal (&sr_sal); /* initialize to zeros */
2654 sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame));
2655 sr_sal.section = find_pc_overlay (sr_sal.pc);
2657 check_for_old_step_resume_breakpoint ();
2659 step_resume_breakpoint
2660 = set_momentary_breakpoint (sr_sal, get_frame_id (return_frame),
2663 if (breakpoints_inserted)
2664 insert_breakpoints ();
2668 stop_stepping (struct execution_control_state *ecs)
2670 /* Let callers know we don't want to wait for the inferior anymore. */
2671 ecs->wait_some_more = 0;
2674 /* This function handles various cases where we need to continue
2675 waiting for the inferior. */
2676 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2679 keep_going (struct execution_control_state *ecs)
2681 /* Save the pc before execution, to compare with pc after stop. */
2682 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2684 /* If we did not do break;, it means we should keep running the
2685 inferior and not return to debugger. */
2687 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2689 /* We took a signal (which we are supposed to pass through to
2690 the inferior, else we'd have done a break above) and we
2691 haven't yet gotten our trap. Simply continue. */
2692 resume (currently_stepping (ecs), stop_signal);
2696 /* Either the trap was not expected, but we are continuing
2697 anyway (the user asked that this signal be passed to the
2700 The signal was SIGTRAP, e.g. it was our signal, but we
2701 decided we should resume from it.
2703 We're going to run this baby now!
2705 Insert breakpoints now, unless we are trying to one-proceed
2706 past a breakpoint. */
2707 /* If we've just finished a special step resume and we don't
2708 want to hit a breakpoint, pull em out. */
2709 if (step_resume_breakpoint == NULL
2710 && ecs->remove_breakpoints_on_following_step)
2712 ecs->remove_breakpoints_on_following_step = 0;
2713 remove_breakpoints ();
2714 breakpoints_inserted = 0;
2716 else if (!breakpoints_inserted && !ecs->another_trap)
2718 breakpoints_failed = insert_breakpoints ();
2719 if (breakpoints_failed)
2721 stop_stepping (ecs);
2724 breakpoints_inserted = 1;
2727 trap_expected = ecs->another_trap;
2729 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2730 specifies that such a signal should be delivered to the
2733 Typically, this would occure when a user is debugging a
2734 target monitor on a simulator: the target monitor sets a
2735 breakpoint; the simulator encounters this break-point and
2736 halts the simulation handing control to GDB; GDB, noteing
2737 that the break-point isn't valid, returns control back to the
2738 simulator; the simulator then delivers the hardware
2739 equivalent of a SIGNAL_TRAP to the program being debugged. */
2741 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2742 stop_signal = TARGET_SIGNAL_0;
2745 resume (currently_stepping (ecs), stop_signal);
2748 prepare_to_wait (ecs);
2751 /* This function normally comes after a resume, before
2752 handle_inferior_event exits. It takes care of any last bits of
2753 housekeeping, and sets the all-important wait_some_more flag. */
2756 prepare_to_wait (struct execution_control_state *ecs)
2758 if (ecs->infwait_state == infwait_normal_state)
2760 overlay_cache_invalid = 1;
2762 /* We have to invalidate the registers BEFORE calling
2763 target_wait because they can be loaded from the target while
2764 in target_wait. This makes remote debugging a bit more
2765 efficient for those targets that provide critical registers
2766 as part of their normal status mechanism. */
2768 registers_changed ();
2769 ecs->waiton_ptid = pid_to_ptid (-1);
2770 ecs->wp = &(ecs->ws);
2772 /* This is the old end of the while loop. Let everybody know we
2773 want to wait for the inferior some more and get called again
2775 ecs->wait_some_more = 1;
2778 /* Print why the inferior has stopped. We always print something when
2779 the inferior exits, or receives a signal. The rest of the cases are
2780 dealt with later on in normal_stop() and print_it_typical(). Ideally
2781 there should be a call to this function from handle_inferior_event()
2782 each time stop_stepping() is called.*/
2784 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2786 switch (stop_reason)
2789 /* We don't deal with these cases from handle_inferior_event()
2792 case END_STEPPING_RANGE:
2793 /* We are done with a step/next/si/ni command. */
2794 /* For now print nothing. */
2795 /* Print a message only if not in the middle of doing a "step n"
2796 operation for n > 1 */
2797 if (!step_multi || !stop_step)
2798 if (ui_out_is_mi_like_p (uiout))
2799 ui_out_field_string (uiout, "reason", "end-stepping-range");
2801 case BREAKPOINT_HIT:
2802 /* We found a breakpoint. */
2803 /* For now print nothing. */
2806 /* The inferior was terminated by a signal. */
2807 annotate_signalled ();
2808 if (ui_out_is_mi_like_p (uiout))
2809 ui_out_field_string (uiout, "reason", "exited-signalled");
2810 ui_out_text (uiout, "\nProgram terminated with signal ");
2811 annotate_signal_name ();
2812 ui_out_field_string (uiout, "signal-name",
2813 target_signal_to_name (stop_info));
2814 annotate_signal_name_end ();
2815 ui_out_text (uiout, ", ");
2816 annotate_signal_string ();
2817 ui_out_field_string (uiout, "signal-meaning",
2818 target_signal_to_string (stop_info));
2819 annotate_signal_string_end ();
2820 ui_out_text (uiout, ".\n");
2821 ui_out_text (uiout, "The program no longer exists.\n");
2824 /* The inferior program is finished. */
2825 annotate_exited (stop_info);
2828 if (ui_out_is_mi_like_p (uiout))
2829 ui_out_field_string (uiout, "reason", "exited");
2830 ui_out_text (uiout, "\nProgram exited with code ");
2831 ui_out_field_fmt (uiout, "exit-code", "0%o",
2832 (unsigned int) stop_info);
2833 ui_out_text (uiout, ".\n");
2837 if (ui_out_is_mi_like_p (uiout))
2838 ui_out_field_string (uiout, "reason", "exited-normally");
2839 ui_out_text (uiout, "\nProgram exited normally.\n");
2842 case SIGNAL_RECEIVED:
2843 /* Signal received. The signal table tells us to print about
2846 ui_out_text (uiout, "\nProgram received signal ");
2847 annotate_signal_name ();
2848 if (ui_out_is_mi_like_p (uiout))
2849 ui_out_field_string (uiout, "reason", "signal-received");
2850 ui_out_field_string (uiout, "signal-name",
2851 target_signal_to_name (stop_info));
2852 annotate_signal_name_end ();
2853 ui_out_text (uiout, ", ");
2854 annotate_signal_string ();
2855 ui_out_field_string (uiout, "signal-meaning",
2856 target_signal_to_string (stop_info));
2857 annotate_signal_string_end ();
2858 ui_out_text (uiout, ".\n");
2861 internal_error (__FILE__, __LINE__,
2862 "print_stop_reason: unrecognized enum value");
2868 /* Here to return control to GDB when the inferior stops for real.
2869 Print appropriate messages, remove breakpoints, give terminal our modes.
2871 STOP_PRINT_FRAME nonzero means print the executing frame
2872 (pc, function, args, file, line number and line text).
2873 BREAKPOINTS_FAILED nonzero means stop was due to error
2874 attempting to insert breakpoints. */
2879 struct target_waitstatus last;
2882 get_last_target_status (&last_ptid, &last);
2884 /* As with the notification of thread events, we want to delay
2885 notifying the user that we've switched thread context until
2886 the inferior actually stops.
2888 There's no point in saying anything if the inferior has exited.
2889 Note that SIGNALLED here means "exited with a signal", not
2890 "received a signal". */
2891 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
2892 && target_has_execution
2893 && last.kind != TARGET_WAITKIND_SIGNALLED
2894 && last.kind != TARGET_WAITKIND_EXITED)
2896 target_terminal_ours_for_output ();
2897 printf_filtered ("[Switching to %s]\n",
2898 target_pid_or_tid_to_str (inferior_ptid));
2899 previous_inferior_ptid = inferior_ptid;
2902 /* NOTE drow/2004-01-17: Is this still necessary? */
2903 /* Make sure that the current_frame's pc is correct. This
2904 is a correction for setting up the frame info before doing
2905 DECR_PC_AFTER_BREAK */
2906 if (target_has_execution)
2907 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2908 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2909 frame code to check for this and sort out any resultant mess.
2910 DECR_PC_AFTER_BREAK needs to just go away. */
2911 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2913 if (target_has_execution && breakpoints_inserted)
2915 if (remove_breakpoints ())
2917 target_terminal_ours_for_output ();
2918 printf_filtered ("Cannot remove breakpoints because ");
2919 printf_filtered ("program is no longer writable.\n");
2920 printf_filtered ("It might be running in another process.\n");
2921 printf_filtered ("Further execution is probably impossible.\n");
2924 breakpoints_inserted = 0;
2926 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2927 Delete any breakpoint that is to be deleted at the next stop. */
2929 breakpoint_auto_delete (stop_bpstat);
2931 /* If an auto-display called a function and that got a signal,
2932 delete that auto-display to avoid an infinite recursion. */
2934 if (stopped_by_random_signal)
2935 disable_current_display ();
2937 /* Don't print a message if in the middle of doing a "step n"
2938 operation for n > 1 */
2939 if (step_multi && stop_step)
2942 target_terminal_ours ();
2944 /* Look up the hook_stop and run it (CLI internally handles problem
2945 of stop_command's pre-hook not existing). */
2947 catch_errors (hook_stop_stub, stop_command,
2948 "Error while running hook_stop:\n", RETURN_MASK_ALL);
2950 if (!target_has_stack)
2956 /* Select innermost stack frame - i.e., current frame is frame 0,
2957 and current location is based on that.
2958 Don't do this on return from a stack dummy routine,
2959 or if the program has exited. */
2961 if (!stop_stack_dummy)
2963 select_frame (get_current_frame ());
2965 /* Print current location without a level number, if
2966 we have changed functions or hit a breakpoint.
2967 Print source line if we have one.
2968 bpstat_print() contains the logic deciding in detail
2969 what to print, based on the event(s) that just occurred. */
2971 if (stop_print_frame && deprecated_selected_frame)
2975 int do_frame_printing = 1;
2977 bpstat_ret = bpstat_print (stop_bpstat);
2981 /* FIXME: cagney/2002-12-01: Given that a frame ID does
2982 (or should) carry around the function and does (or
2983 should) use that when doing a frame comparison. */
2985 && frame_id_eq (step_frame_id,
2986 get_frame_id (get_current_frame ()))
2987 && step_start_function == find_pc_function (stop_pc))
2988 source_flag = SRC_LINE; /* finished step, just print source line */
2990 source_flag = SRC_AND_LOC; /* print location and source line */
2992 case PRINT_SRC_AND_LOC:
2993 source_flag = SRC_AND_LOC; /* print location and source line */
2995 case PRINT_SRC_ONLY:
2996 source_flag = SRC_LINE;
2999 source_flag = SRC_LINE; /* something bogus */
3000 do_frame_printing = 0;
3003 internal_error (__FILE__, __LINE__, "Unknown value.");
3005 /* For mi, have the same behavior every time we stop:
3006 print everything but the source line. */
3007 if (ui_out_is_mi_like_p (uiout))
3008 source_flag = LOC_AND_ADDRESS;
3010 if (ui_out_is_mi_like_p (uiout))
3011 ui_out_field_int (uiout, "thread-id",
3012 pid_to_thread_id (inferior_ptid));
3013 /* The behavior of this routine with respect to the source
3015 SRC_LINE: Print only source line
3016 LOCATION: Print only location
3017 SRC_AND_LOC: Print location and source line */
3018 if (do_frame_printing)
3019 print_stack_frame (get_selected_frame (), 0, source_flag);
3021 /* Display the auto-display expressions. */
3026 /* Save the function value return registers, if we care.
3027 We might be about to restore their previous contents. */
3028 if (proceed_to_finish)
3029 /* NB: The copy goes through to the target picking up the value of
3030 all the registers. */
3031 regcache_cpy (stop_registers, current_regcache);
3033 if (stop_stack_dummy)
3035 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3036 ends with a setting of the current frame, so we can use that
3038 frame_pop (get_current_frame ());
3039 /* Set stop_pc to what it was before we called the function.
3040 Can't rely on restore_inferior_status because that only gets
3041 called if we don't stop in the called function. */
3042 stop_pc = read_pc ();
3043 select_frame (get_current_frame ());
3047 annotate_stopped ();
3048 observer_notify_normal_stop (stop_bpstat);
3052 hook_stop_stub (void *cmd)
3054 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3059 signal_stop_state (int signo)
3061 return signal_stop[signo];
3065 signal_print_state (int signo)
3067 return signal_print[signo];
3071 signal_pass_state (int signo)
3073 return signal_program[signo];
3077 signal_stop_update (int signo, int state)
3079 int ret = signal_stop[signo];
3080 signal_stop[signo] = state;
3085 signal_print_update (int signo, int state)
3087 int ret = signal_print[signo];
3088 signal_print[signo] = state;
3093 signal_pass_update (int signo, int state)
3095 int ret = signal_program[signo];
3096 signal_program[signo] = state;
3101 sig_print_header (void)
3104 Signal Stop\tPrint\tPass to program\tDescription\n");
3108 sig_print_info (enum target_signal oursig)
3110 char *name = target_signal_to_name (oursig);
3111 int name_padding = 13 - strlen (name);
3113 if (name_padding <= 0)
3116 printf_filtered ("%s", name);
3117 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3118 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3119 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3120 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3121 printf_filtered ("%s\n", target_signal_to_string (oursig));
3124 /* Specify how various signals in the inferior should be handled. */
3127 handle_command (char *args, int from_tty)
3130 int digits, wordlen;
3131 int sigfirst, signum, siglast;
3132 enum target_signal oursig;
3135 unsigned char *sigs;
3136 struct cleanup *old_chain;
3140 error_no_arg ("signal to handle");
3143 /* Allocate and zero an array of flags for which signals to handle. */
3145 nsigs = (int) TARGET_SIGNAL_LAST;
3146 sigs = (unsigned char *) alloca (nsigs);
3147 memset (sigs, 0, nsigs);
3149 /* Break the command line up into args. */
3151 argv = buildargv (args);
3156 old_chain = make_cleanup_freeargv (argv);
3158 /* Walk through the args, looking for signal oursigs, signal names, and
3159 actions. Signal numbers and signal names may be interspersed with
3160 actions, with the actions being performed for all signals cumulatively
3161 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3163 while (*argv != NULL)
3165 wordlen = strlen (*argv);
3166 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3170 sigfirst = siglast = -1;
3172 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3174 /* Apply action to all signals except those used by the
3175 debugger. Silently skip those. */
3178 siglast = nsigs - 1;
3180 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3182 SET_SIGS (nsigs, sigs, signal_stop);
3183 SET_SIGS (nsigs, sigs, signal_print);
3185 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3187 UNSET_SIGS (nsigs, sigs, signal_program);
3189 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3191 SET_SIGS (nsigs, sigs, signal_print);
3193 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3195 SET_SIGS (nsigs, sigs, signal_program);
3197 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3199 UNSET_SIGS (nsigs, sigs, signal_stop);
3201 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3203 SET_SIGS (nsigs, sigs, signal_program);
3205 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3207 UNSET_SIGS (nsigs, sigs, signal_print);
3208 UNSET_SIGS (nsigs, sigs, signal_stop);
3210 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3212 UNSET_SIGS (nsigs, sigs, signal_program);
3214 else if (digits > 0)
3216 /* It is numeric. The numeric signal refers to our own
3217 internal signal numbering from target.h, not to host/target
3218 signal number. This is a feature; users really should be
3219 using symbolic names anyway, and the common ones like
3220 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3222 sigfirst = siglast = (int)
3223 target_signal_from_command (atoi (*argv));
3224 if ((*argv)[digits] == '-')
3227 target_signal_from_command (atoi ((*argv) + digits + 1));
3229 if (sigfirst > siglast)
3231 /* Bet he didn't figure we'd think of this case... */
3239 oursig = target_signal_from_name (*argv);
3240 if (oursig != TARGET_SIGNAL_UNKNOWN)
3242 sigfirst = siglast = (int) oursig;
3246 /* Not a number and not a recognized flag word => complain. */
3247 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3251 /* If any signal numbers or symbol names were found, set flags for
3252 which signals to apply actions to. */
3254 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3256 switch ((enum target_signal) signum)
3258 case TARGET_SIGNAL_TRAP:
3259 case TARGET_SIGNAL_INT:
3260 if (!allsigs && !sigs[signum])
3262 if (query ("%s is used by the debugger.\n\
3263 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3269 printf_unfiltered ("Not confirmed, unchanged.\n");
3270 gdb_flush (gdb_stdout);
3274 case TARGET_SIGNAL_0:
3275 case TARGET_SIGNAL_DEFAULT:
3276 case TARGET_SIGNAL_UNKNOWN:
3277 /* Make sure that "all" doesn't print these. */
3288 target_notice_signals (inferior_ptid);
3292 /* Show the results. */
3293 sig_print_header ();
3294 for (signum = 0; signum < nsigs; signum++)
3298 sig_print_info (signum);
3303 do_cleanups (old_chain);
3307 xdb_handle_command (char *args, int from_tty)
3310 struct cleanup *old_chain;
3312 /* Break the command line up into args. */
3314 argv = buildargv (args);
3319 old_chain = make_cleanup_freeargv (argv);
3320 if (argv[1] != (char *) NULL)
3325 bufLen = strlen (argv[0]) + 20;
3326 argBuf = (char *) xmalloc (bufLen);
3330 enum target_signal oursig;
3332 oursig = target_signal_from_name (argv[0]);
3333 memset (argBuf, 0, bufLen);
3334 if (strcmp (argv[1], "Q") == 0)
3335 sprintf (argBuf, "%s %s", argv[0], "noprint");
3338 if (strcmp (argv[1], "s") == 0)
3340 if (!signal_stop[oursig])
3341 sprintf (argBuf, "%s %s", argv[0], "stop");
3343 sprintf (argBuf, "%s %s", argv[0], "nostop");
3345 else if (strcmp (argv[1], "i") == 0)
3347 if (!signal_program[oursig])
3348 sprintf (argBuf, "%s %s", argv[0], "pass");
3350 sprintf (argBuf, "%s %s", argv[0], "nopass");
3352 else if (strcmp (argv[1], "r") == 0)
3354 if (!signal_print[oursig])
3355 sprintf (argBuf, "%s %s", argv[0], "print");
3357 sprintf (argBuf, "%s %s", argv[0], "noprint");
3363 handle_command (argBuf, from_tty);
3365 printf_filtered ("Invalid signal handling flag.\n");
3370 do_cleanups (old_chain);
3373 /* Print current contents of the tables set by the handle command.
3374 It is possible we should just be printing signals actually used
3375 by the current target (but for things to work right when switching
3376 targets, all signals should be in the signal tables). */
3379 signals_info (char *signum_exp, int from_tty)
3381 enum target_signal oursig;
3382 sig_print_header ();
3386 /* First see if this is a symbol name. */
3387 oursig = target_signal_from_name (signum_exp);
3388 if (oursig == TARGET_SIGNAL_UNKNOWN)
3390 /* No, try numeric. */
3392 target_signal_from_command (parse_and_eval_long (signum_exp));
3394 sig_print_info (oursig);
3398 printf_filtered ("\n");
3399 /* These ugly casts brought to you by the native VAX compiler. */
3400 for (oursig = TARGET_SIGNAL_FIRST;
3401 (int) oursig < (int) TARGET_SIGNAL_LAST;
3402 oursig = (enum target_signal) ((int) oursig + 1))
3406 if (oursig != TARGET_SIGNAL_UNKNOWN
3407 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3408 sig_print_info (oursig);
3411 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3414 struct inferior_status
3416 enum target_signal stop_signal;
3420 int stop_stack_dummy;
3421 int stopped_by_random_signal;
3423 CORE_ADDR step_range_start;
3424 CORE_ADDR step_range_end;
3425 struct frame_id step_frame_id;
3426 enum step_over_calls_kind step_over_calls;
3427 CORE_ADDR step_resume_break_address;
3428 int stop_after_trap;
3430 struct regcache *stop_registers;
3432 /* These are here because if call_function_by_hand has written some
3433 registers and then decides to call error(), we better not have changed
3435 struct regcache *registers;
3437 /* A frame unique identifier. */
3438 struct frame_id selected_frame_id;
3440 int breakpoint_proceeded;
3441 int restore_stack_info;
3442 int proceed_to_finish;
3446 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3449 int size = register_size (current_gdbarch, regno);
3450 void *buf = alloca (size);
3451 store_signed_integer (buf, size, val);
3452 regcache_raw_write (inf_status->registers, regno, buf);
3455 /* Save all of the information associated with the inferior<==>gdb
3456 connection. INF_STATUS is a pointer to a "struct inferior_status"
3457 (defined in inferior.h). */
3459 struct inferior_status *
3460 save_inferior_status (int restore_stack_info)
3462 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3464 inf_status->stop_signal = stop_signal;
3465 inf_status->stop_pc = stop_pc;
3466 inf_status->stop_step = stop_step;
3467 inf_status->stop_stack_dummy = stop_stack_dummy;
3468 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3469 inf_status->trap_expected = trap_expected;
3470 inf_status->step_range_start = step_range_start;
3471 inf_status->step_range_end = step_range_end;
3472 inf_status->step_frame_id = step_frame_id;
3473 inf_status->step_over_calls = step_over_calls;
3474 inf_status->stop_after_trap = stop_after_trap;
3475 inf_status->stop_soon = stop_soon;
3476 /* Save original bpstat chain here; replace it with copy of chain.
3477 If caller's caller is walking the chain, they'll be happier if we
3478 hand them back the original chain when restore_inferior_status is
3480 inf_status->stop_bpstat = stop_bpstat;
3481 stop_bpstat = bpstat_copy (stop_bpstat);
3482 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3483 inf_status->restore_stack_info = restore_stack_info;
3484 inf_status->proceed_to_finish = proceed_to_finish;
3486 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3488 inf_status->registers = regcache_dup (current_regcache);
3490 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3495 restore_selected_frame (void *args)
3497 struct frame_id *fid = (struct frame_id *) args;
3498 struct frame_info *frame;
3500 frame = frame_find_by_id (*fid);
3502 /* If inf_status->selected_frame_id is NULL, there was no previously
3506 warning ("Unable to restore previously selected frame.\n");
3510 select_frame (frame);
3516 restore_inferior_status (struct inferior_status *inf_status)
3518 stop_signal = inf_status->stop_signal;
3519 stop_pc = inf_status->stop_pc;
3520 stop_step = inf_status->stop_step;
3521 stop_stack_dummy = inf_status->stop_stack_dummy;
3522 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3523 trap_expected = inf_status->trap_expected;
3524 step_range_start = inf_status->step_range_start;
3525 step_range_end = inf_status->step_range_end;
3526 step_frame_id = inf_status->step_frame_id;
3527 step_over_calls = inf_status->step_over_calls;
3528 stop_after_trap = inf_status->stop_after_trap;
3529 stop_soon = inf_status->stop_soon;
3530 bpstat_clear (&stop_bpstat);
3531 stop_bpstat = inf_status->stop_bpstat;
3532 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3533 proceed_to_finish = inf_status->proceed_to_finish;
3535 /* FIXME: Is the restore of stop_registers always needed. */
3536 regcache_xfree (stop_registers);
3537 stop_registers = inf_status->stop_registers;
3539 /* The inferior can be gone if the user types "print exit(0)"
3540 (and perhaps other times). */
3541 if (target_has_execution)
3542 /* NB: The register write goes through to the target. */
3543 regcache_cpy (current_regcache, inf_status->registers);
3544 regcache_xfree (inf_status->registers);
3546 /* FIXME: If we are being called after stopping in a function which
3547 is called from gdb, we should not be trying to restore the
3548 selected frame; it just prints a spurious error message (The
3549 message is useful, however, in detecting bugs in gdb (like if gdb
3550 clobbers the stack)). In fact, should we be restoring the
3551 inferior status at all in that case? . */
3553 if (target_has_stack && inf_status->restore_stack_info)
3555 /* The point of catch_errors is that if the stack is clobbered,
3556 walking the stack might encounter a garbage pointer and
3557 error() trying to dereference it. */
3559 (restore_selected_frame, &inf_status->selected_frame_id,
3560 "Unable to restore previously selected frame:\n",
3561 RETURN_MASK_ERROR) == 0)
3562 /* Error in restoring the selected frame. Select the innermost
3564 select_frame (get_current_frame ());
3572 do_restore_inferior_status_cleanup (void *sts)
3574 restore_inferior_status (sts);
3578 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3580 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3584 discard_inferior_status (struct inferior_status *inf_status)
3586 /* See save_inferior_status for info on stop_bpstat. */
3587 bpstat_clear (&inf_status->stop_bpstat);
3588 regcache_xfree (inf_status->registers);
3589 regcache_xfree (inf_status->stop_registers);
3594 inferior_has_forked (int pid, int *child_pid)
3596 struct target_waitstatus last;
3599 get_last_target_status (&last_ptid, &last);
3601 if (last.kind != TARGET_WAITKIND_FORKED)
3604 if (ptid_get_pid (last_ptid) != pid)
3607 *child_pid = last.value.related_pid;
3612 inferior_has_vforked (int pid, int *child_pid)
3614 struct target_waitstatus last;
3617 get_last_target_status (&last_ptid, &last);
3619 if (last.kind != TARGET_WAITKIND_VFORKED)
3622 if (ptid_get_pid (last_ptid) != pid)
3625 *child_pid = last.value.related_pid;
3630 inferior_has_execd (int pid, char **execd_pathname)
3632 struct target_waitstatus last;
3635 get_last_target_status (&last_ptid, &last);
3637 if (last.kind != TARGET_WAITKIND_EXECD)
3640 if (ptid_get_pid (last_ptid) != pid)
3643 *execd_pathname = xstrdup (last.value.execd_pathname);
3647 /* Oft used ptids */
3649 ptid_t minus_one_ptid;
3651 /* Create a ptid given the necessary PID, LWP, and TID components. */
3654 ptid_build (int pid, long lwp, long tid)
3664 /* Create a ptid from just a pid. */
3667 pid_to_ptid (int pid)
3669 return ptid_build (pid, 0, 0);
3672 /* Fetch the pid (process id) component from a ptid. */
3675 ptid_get_pid (ptid_t ptid)
3680 /* Fetch the lwp (lightweight process) component from a ptid. */
3683 ptid_get_lwp (ptid_t ptid)
3688 /* Fetch the tid (thread id) component from a ptid. */
3691 ptid_get_tid (ptid_t ptid)
3696 /* ptid_equal() is used to test equality of two ptids. */
3699 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3701 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3702 && ptid1.tid == ptid2.tid);
3705 /* restore_inferior_ptid() will be used by the cleanup machinery
3706 to restore the inferior_ptid value saved in a call to
3707 save_inferior_ptid(). */
3710 restore_inferior_ptid (void *arg)
3712 ptid_t *saved_ptid_ptr = arg;
3713 inferior_ptid = *saved_ptid_ptr;
3717 /* Save the value of inferior_ptid so that it may be restored by a
3718 later call to do_cleanups(). Returns the struct cleanup pointer
3719 needed for later doing the cleanup. */
3722 save_inferior_ptid (void)
3724 ptid_t *saved_ptid_ptr;
3726 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3727 *saved_ptid_ptr = inferior_ptid;
3728 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3735 stop_registers = regcache_xmalloc (current_gdbarch);
3739 _initialize_infrun (void)
3743 struct cmd_list_element *c;
3745 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers);
3746 deprecated_register_gdbarch_swap (NULL, 0, build_infrun);
3748 add_info ("signals", signals_info,
3749 "What debugger does when program gets various signals.\n\
3750 Specify a signal as argument to print info on that signal only.");
3751 add_info_alias ("handle", "signals", 0);
3753 add_com ("handle", class_run, handle_command,
3754 concat ("Specify how to handle a signal.\n\
3755 Args are signals and actions to apply to those signals.\n\
3756 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3757 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3758 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3759 The special arg \"all\" is recognized to mean all signals except those\n\
3760 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3761 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3762 Stop means reenter debugger if this signal happens (implies print).\n\
3763 Print means print a message if this signal happens.\n\
3764 Pass means let program see this signal; otherwise program doesn't know.\n\
3765 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3766 Pass and Stop may be combined.", NULL));
3769 add_com ("lz", class_info, signals_info,
3770 "What debugger does when program gets various signals.\n\
3771 Specify a signal as argument to print info on that signal only.");
3772 add_com ("z", class_run, xdb_handle_command,
3773 concat ("Specify how to handle a signal.\n\
3774 Args are signals and actions to apply to those signals.\n\
3775 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3776 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3777 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3778 The special arg \"all\" is recognized to mean all signals except those\n\
3779 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3780 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3781 nopass), \"Q\" (noprint)\n\
3782 Stop means reenter debugger if this signal happens (implies print).\n\
3783 Print means print a message if this signal happens.\n\
3784 Pass means let program see this signal; otherwise program doesn't know.\n\
3785 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3786 Pass and Stop may be combined.", NULL));
3791 add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\
3792 This allows you to set a list of commands to be run each time execution\n\
3793 of the program stops.", &cmdlist);
3795 numsigs = (int) TARGET_SIGNAL_LAST;
3796 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
3797 signal_print = (unsigned char *)
3798 xmalloc (sizeof (signal_print[0]) * numsigs);
3799 signal_program = (unsigned char *)
3800 xmalloc (sizeof (signal_program[0]) * numsigs);
3801 for (i = 0; i < numsigs; i++)
3804 signal_print[i] = 1;
3805 signal_program[i] = 1;
3808 /* Signals caused by debugger's own actions
3809 should not be given to the program afterwards. */
3810 signal_program[TARGET_SIGNAL_TRAP] = 0;
3811 signal_program[TARGET_SIGNAL_INT] = 0;
3813 /* Signals that are not errors should not normally enter the debugger. */
3814 signal_stop[TARGET_SIGNAL_ALRM] = 0;
3815 signal_print[TARGET_SIGNAL_ALRM] = 0;
3816 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
3817 signal_print[TARGET_SIGNAL_VTALRM] = 0;
3818 signal_stop[TARGET_SIGNAL_PROF] = 0;
3819 signal_print[TARGET_SIGNAL_PROF] = 0;
3820 signal_stop[TARGET_SIGNAL_CHLD] = 0;
3821 signal_print[TARGET_SIGNAL_CHLD] = 0;
3822 signal_stop[TARGET_SIGNAL_IO] = 0;
3823 signal_print[TARGET_SIGNAL_IO] = 0;
3824 signal_stop[TARGET_SIGNAL_POLL] = 0;
3825 signal_print[TARGET_SIGNAL_POLL] = 0;
3826 signal_stop[TARGET_SIGNAL_URG] = 0;
3827 signal_print[TARGET_SIGNAL_URG] = 0;
3828 signal_stop[TARGET_SIGNAL_WINCH] = 0;
3829 signal_print[TARGET_SIGNAL_WINCH] = 0;
3831 /* These signals are used internally by user-level thread
3832 implementations. (See signal(5) on Solaris.) Like the above
3833 signals, a healthy program receives and handles them as part of
3834 its normal operation. */
3835 signal_stop[TARGET_SIGNAL_LWP] = 0;
3836 signal_print[TARGET_SIGNAL_LWP] = 0;
3837 signal_stop[TARGET_SIGNAL_WAITING] = 0;
3838 signal_print[TARGET_SIGNAL_WAITING] = 0;
3839 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
3840 signal_print[TARGET_SIGNAL_CANCEL] = 0;
3843 deprecated_add_show_from_set
3844 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
3845 (char *) &stop_on_solib_events,
3846 "Set stopping for shared library events.\n\
3847 If nonzero, gdb will give control to the user when the dynamic linker\n\
3848 notifies gdb of shared library events. The most common event of interest\n\
3849 to the user would be loading/unloading of a new library.\n", &setlist), &showlist);
3852 c = add_set_enum_cmd ("follow-fork-mode",
3854 follow_fork_mode_kind_names, &follow_fork_mode_string,
3855 "Set debugger response to a program call of fork \
3857 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3858 parent - the original process is debugged after a fork\n\
3859 child - the new process is debugged after a fork\n\
3860 The unfollowed process will continue to run.\n\
3861 By default, the debugger will follow the parent process.", &setlist);
3862 deprecated_add_show_from_set (c, &showlist);
3864 c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */
3865 &scheduler_mode, /* current mode */
3866 "Set mode for locking scheduler during execution.\n\
3867 off == no locking (threads may preempt at any time)\n\
3868 on == full locking (no thread except the current thread may run)\n\
3869 step == scheduler locked during every single-step operation.\n\
3870 In this mode, no other thread may run during a step command.\n\
3871 Other threads may run while stepping over a function call ('next').", &setlist);
3873 set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */
3874 deprecated_add_show_from_set (c, &showlist);
3876 c = add_set_cmd ("step-mode", class_run,
3877 var_boolean, (char *) &step_stop_if_no_debug,
3878 "Set mode of the step operation. When set, doing a step over a\n\
3879 function without debug line information will stop at the first\n\
3880 instruction of that function. Otherwise, the function is skipped and\n\
3881 the step command stops at a different source line.", &setlist);
3882 deprecated_add_show_from_set (c, &showlist);
3884 /* ptid initializations */
3885 null_ptid = ptid_build (0, 0, 0);
3886 minus_one_ptid = ptid_build (-1, 0, 0);
3887 inferior_ptid = null_ptid;
3888 target_last_wait_ptid = minus_one_ptid;