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 static int debug_infrun
= 0;
111 /* If the program uses ELF-style shared libraries, then calls to
112 functions in shared libraries go through stubs, which live in a
113 table called the PLT (Procedure Linkage Table). The first time the
114 function is called, the stub sends control to the dynamic linker,
115 which looks up the function's real address, patches the stub so
116 that future calls will go directly to the function, and then passes
117 control to the function.
119 If we are stepping at the source level, we don't want to see any of
120 this --- we just want to skip over the stub and the dynamic linker.
121 The simple approach is to single-step until control leaves the
124 However, on some systems (e.g., Red Hat's 5.2 distribution) the
125 dynamic linker calls functions in the shared C library, so you
126 can't tell from the PC alone whether the dynamic linker is still
127 running. In this case, we use a step-resume breakpoint to get us
128 past the dynamic linker, as if we were using "next" to step over a
131 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
132 linker code or not. Normally, this means we single-step. However,
133 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
134 address where we can place a step-resume breakpoint to get past the
135 linker's symbol resolution function.
137 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
138 pretty portable way, by comparing the PC against the address ranges
139 of the dynamic linker's sections.
141 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
142 it depends on internal details of the dynamic linker. It's usually
143 not too hard to figure out where to put a breakpoint, but it
144 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
145 sanity checking. If it can't figure things out, returning zero and
146 getting the (possibly confusing) stepping behavior is better than
147 signalling an error, which will obscure the change in the
150 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
151 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
154 /* This function returns TRUE if pc is the address of an instruction
155 that lies within the dynamic linker (such as the event hook, or the
158 This function must be used only when a dynamic linker event has
159 been caught, and the inferior is being stepped out of the hook, or
160 undefined results are guaranteed. */
162 #ifndef SOLIB_IN_DYNAMIC_LINKER
163 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
166 /* We can't step off a permanent breakpoint in the ordinary way, because we
167 can't remove it. Instead, we have to advance the PC to the next
168 instruction. This macro should expand to a pointer to a function that
169 does that, or zero if we have no such function. If we don't have a
170 definition for it, we have to report an error. */
171 #ifndef SKIP_PERMANENT_BREAKPOINT
172 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
174 default_skip_permanent_breakpoint (void)
177 The program is stopped at a permanent breakpoint, but GDB does not know\n\
178 how to step past a permanent breakpoint on this architecture. Try using\n\
179 a command like `return' or `jump' to continue execution.");
184 /* Convert the #defines into values. This is temporary until wfi control
185 flow is completely sorted out. */
187 #ifndef HAVE_STEPPABLE_WATCHPOINT
188 #define HAVE_STEPPABLE_WATCHPOINT 0
190 #undef HAVE_STEPPABLE_WATCHPOINT
191 #define HAVE_STEPPABLE_WATCHPOINT 1
194 #ifndef CANNOT_STEP_HW_WATCHPOINTS
195 #define CANNOT_STEP_HW_WATCHPOINTS 0
197 #undef CANNOT_STEP_HW_WATCHPOINTS
198 #define CANNOT_STEP_HW_WATCHPOINTS 1
201 /* Tables of how to react to signals; the user sets them. */
203 static unsigned char *signal_stop
;
204 static unsigned char *signal_print
;
205 static unsigned char *signal_program
;
207 #define SET_SIGS(nsigs,sigs,flags) \
209 int signum = (nsigs); \
210 while (signum-- > 0) \
211 if ((sigs)[signum]) \
212 (flags)[signum] = 1; \
215 #define UNSET_SIGS(nsigs,sigs,flags) \
217 int signum = (nsigs); \
218 while (signum-- > 0) \
219 if ((sigs)[signum]) \
220 (flags)[signum] = 0; \
223 /* Value to pass to target_resume() to cause all threads to resume */
225 #define RESUME_ALL (pid_to_ptid (-1))
227 /* Command list pointer for the "stop" placeholder. */
229 static struct cmd_list_element
*stop_command
;
231 /* Nonzero if breakpoints are now inserted in the inferior. */
233 static int breakpoints_inserted
;
235 /* Function inferior was in as of last step command. */
237 static struct symbol
*step_start_function
;
239 /* Nonzero if we are expecting a trace trap and should proceed from it. */
241 static int trap_expected
;
244 /* Nonzero if we want to give control to the user when we're notified
245 of shared library events by the dynamic linker. */
246 static int stop_on_solib_events
;
249 /* Nonzero means expecting a trace trap
250 and should stop the inferior and return silently when it happens. */
254 /* Nonzero means expecting a trap and caller will handle it themselves.
255 It is used after attach, due to attaching to a process;
256 when running in the shell before the child program has been exec'd;
257 and when running some kinds of remote stuff (FIXME?). */
259 enum stop_kind stop_soon
;
261 /* Nonzero if proceed is being used for a "finish" command or a similar
262 situation when stop_registers should be saved. */
264 int proceed_to_finish
;
266 /* Save register contents here when about to pop a stack dummy frame,
267 if-and-only-if proceed_to_finish is set.
268 Thus this contains the return value from the called function (assuming
269 values are returned in a register). */
271 struct regcache
*stop_registers
;
273 /* Nonzero if program stopped due to error trying to insert breakpoints. */
275 static int breakpoints_failed
;
277 /* Nonzero after stop if current stack frame should be printed. */
279 static int stop_print_frame
;
281 static struct breakpoint
*step_resume_breakpoint
= NULL
;
283 /* This is a cached copy of the pid/waitstatus of the last event
284 returned by target_wait()/deprecated_target_wait_hook(). This
285 information is returned by get_last_target_status(). */
286 static ptid_t target_last_wait_ptid
;
287 static struct target_waitstatus target_last_waitstatus
;
289 /* This is used to remember when a fork, vfork or exec event
290 was caught by a catchpoint, and thus the event is to be
291 followed at the next resume of the inferior, and not
295 enum target_waitkind kind
;
302 char *execd_pathname
;
306 static const char follow_fork_mode_child
[] = "child";
307 static const char follow_fork_mode_parent
[] = "parent";
309 static const char *follow_fork_mode_kind_names
[] = {
310 follow_fork_mode_child
,
311 follow_fork_mode_parent
,
315 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
321 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
323 return target_follow_fork (follow_child
);
327 follow_inferior_reset_breakpoints (void)
329 /* Was there a step_resume breakpoint? (There was if the user
330 did a "next" at the fork() call.) If so, explicitly reset its
333 step_resumes are a form of bp that are made to be per-thread.
334 Since we created the step_resume bp when the parent process
335 was being debugged, and now are switching to the child process,
336 from the breakpoint package's viewpoint, that's a switch of
337 "threads". We must update the bp's notion of which thread
338 it is for, or it'll be ignored when it triggers. */
340 if (step_resume_breakpoint
)
341 breakpoint_re_set_thread (step_resume_breakpoint
);
343 /* Reinsert all breakpoints in the child. The user may have set
344 breakpoints after catching the fork, in which case those
345 were never set in the child, but only in the parent. This makes
346 sure the inserted breakpoints match the breakpoint list. */
348 breakpoint_re_set ();
349 insert_breakpoints ();
352 /* EXECD_PATHNAME is assumed to be non-NULL. */
355 follow_exec (int pid
, char *execd_pathname
)
358 struct target_ops
*tgt
;
360 if (!may_follow_exec
)
363 /* This is an exec event that we actually wish to pay attention to.
364 Refresh our symbol table to the newly exec'd program, remove any
367 If there are breakpoints, they aren't really inserted now,
368 since the exec() transformed our inferior into a fresh set
371 We want to preserve symbolic breakpoints on the list, since
372 we have hopes that they can be reset after the new a.out's
373 symbol table is read.
375 However, any "raw" breakpoints must be removed from the list
376 (e.g., the solib bp's), since their address is probably invalid
379 And, we DON'T want to call delete_breakpoints() here, since
380 that may write the bp's "shadow contents" (the instruction
381 value that was overwritten witha TRAP instruction). Since
382 we now have a new a.out, those shadow contents aren't valid. */
383 update_breakpoints_after_exec ();
385 /* If there was one, it's gone now. We cannot truly step-to-next
386 statement through an exec(). */
387 step_resume_breakpoint
= NULL
;
388 step_range_start
= 0;
391 /* What is this a.out's name? */
392 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
394 /* We've followed the inferior through an exec. Therefore, the
395 inferior has essentially been killed & reborn. */
397 /* First collect the run target in effect. */
398 tgt
= find_run_target ();
399 /* If we can't find one, things are in a very strange state... */
401 error ("Could find run target to save before following exec");
403 gdb_flush (gdb_stdout
);
404 target_mourn_inferior ();
405 inferior_ptid
= pid_to_ptid (saved_pid
);
406 /* Because mourn_inferior resets inferior_ptid. */
409 /* That a.out is now the one to use. */
410 exec_file_attach (execd_pathname
, 0);
412 /* And also is where symbols can be found. */
413 symbol_file_add_main (execd_pathname
, 0);
415 /* Reset the shared library package. This ensures that we get
416 a shlib event when the child reaches "_start", at which point
417 the dld will have had a chance to initialize the child. */
418 #if defined(SOLIB_RESTART)
421 #ifdef SOLIB_CREATE_INFERIOR_HOOK
422 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
425 /* Reinsert all breakpoints. (Those which were symbolic have
426 been reset to the proper address in the new a.out, thanks
427 to symbol_file_command...) */
428 insert_breakpoints ();
430 /* The next resume of this inferior should bring it to the shlib
431 startup breakpoints. (If the user had also set bp's on
432 "main" from the old (parent) process, then they'll auto-
433 matically get reset there in the new process.) */
436 /* Non-zero if we just simulating a single-step. This is needed
437 because we cannot remove the breakpoints in the inferior process
438 until after the `wait' in `wait_for_inferior'. */
439 static int singlestep_breakpoints_inserted_p
= 0;
441 /* The thread we inserted single-step breakpoints for. */
442 static ptid_t singlestep_ptid
;
444 /* If another thread hit the singlestep breakpoint, we save the original
445 thread here so that we can resume single-stepping it later. */
446 static ptid_t saved_singlestep_ptid
;
447 static int stepping_past_singlestep_breakpoint
;
450 /* Things to clean up if we QUIT out of resume (). */
452 resume_cleanups (void *ignore
)
457 static const char schedlock_off
[] = "off";
458 static const char schedlock_on
[] = "on";
459 static const char schedlock_step
[] = "step";
460 static const char *scheduler_mode
= schedlock_off
;
461 static const char *scheduler_enums
[] = {
469 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
471 /* NOTE: cagney/2002-03-17: The deprecated_add_show_from_set()
472 function clones the set command passed as a parameter. The clone
473 operation will include (BUG?) any ``set'' command callback, if
474 present. Commands like ``info set'' call all the ``show''
475 command callbacks. Unfortunately, for ``show'' commands cloned
476 from ``set'', this includes callbacks belonging to ``set''
477 commands. Making this worse, this only occures if
478 deprecated_add_show_from_set() is called after add_cmd_sfunc()
480 if (cmd_type (c
) == set_cmd
)
481 if (!target_can_lock_scheduler
)
483 scheduler_mode
= schedlock_off
;
484 error ("Target '%s' cannot support this command.", target_shortname
);
489 /* Resume the inferior, but allow a QUIT. This is useful if the user
490 wants to interrupt some lengthy single-stepping operation
491 (for child processes, the SIGINT goes to the inferior, and so
492 we get a SIGINT random_signal, but for remote debugging and perhaps
493 other targets, that's not true).
495 STEP nonzero if we should step (zero to continue instead).
496 SIG is the signal to give the inferior (zero for none). */
498 resume (int step
, enum target_signal sig
)
500 int should_resume
= 1;
501 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
505 printf_unfiltered ("infrun: resume (step=%d, signal=%d)\n", step
, sig
);
507 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
510 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
511 over an instruction that causes a page fault without triggering
512 a hardware watchpoint. The kernel properly notices that it shouldn't
513 stop, because the hardware watchpoint is not triggered, but it forgets
514 the step request and continues the program normally.
515 Work around the problem by removing hardware watchpoints if a step is
516 requested, GDB will check for a hardware watchpoint trigger after the
518 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
519 remove_hw_watchpoints ();
522 /* Normally, by the time we reach `resume', the breakpoints are either
523 removed or inserted, as appropriate. The exception is if we're sitting
524 at a permanent breakpoint; we need to step over it, but permanent
525 breakpoints can't be removed. So we have to test for it here. */
526 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
527 SKIP_PERMANENT_BREAKPOINT ();
529 if (SOFTWARE_SINGLE_STEP_P () && step
)
531 /* Do it the hard way, w/temp breakpoints */
532 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
533 /* ...and don't ask hardware to do it. */
535 /* and do not pull these breakpoints until after a `wait' in
536 `wait_for_inferior' */
537 singlestep_breakpoints_inserted_p
= 1;
538 singlestep_ptid
= inferior_ptid
;
541 /* If there were any forks/vforks/execs that were caught and are
542 now to be followed, then do so. */
543 switch (pending_follow
.kind
)
545 case TARGET_WAITKIND_FORKED
:
546 case TARGET_WAITKIND_VFORKED
:
547 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
552 case TARGET_WAITKIND_EXECD
:
553 /* follow_exec is called as soon as the exec event is seen. */
554 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
561 /* Install inferior's terminal modes. */
562 target_terminal_inferior ();
568 resume_ptid
= RESUME_ALL
; /* Default */
570 if ((step
|| singlestep_breakpoints_inserted_p
)
571 && (stepping_past_singlestep_breakpoint
572 || (!breakpoints_inserted
&& breakpoint_here_p (read_pc ()))))
574 /* Stepping past a breakpoint without inserting breakpoints.
575 Make sure only the current thread gets to step, so that
576 other threads don't sneak past breakpoints while they are
579 resume_ptid
= inferior_ptid
;
582 if ((scheduler_mode
== schedlock_on
)
583 || (scheduler_mode
== schedlock_step
584 && (step
|| singlestep_breakpoints_inserted_p
)))
586 /* User-settable 'scheduler' mode requires solo thread resume. */
587 resume_ptid
= inferior_ptid
;
590 if (CANNOT_STEP_BREAKPOINT
)
592 /* Most targets can step a breakpoint instruction, thus
593 executing it normally. But if this one cannot, just
594 continue and we will hit it anyway. */
595 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
598 target_resume (resume_ptid
, step
, sig
);
601 discard_cleanups (old_cleanups
);
605 /* Clear out all variables saying what to do when inferior is continued.
606 First do this, then set the ones you want, then call `proceed'. */
609 clear_proceed_status (void)
612 step_range_start
= 0;
614 step_frame_id
= null_frame_id
;
615 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
617 stop_soon
= NO_STOP_QUIETLY
;
618 proceed_to_finish
= 0;
619 breakpoint_proceeded
= 1; /* We're about to proceed... */
621 /* Discard any remaining commands or status from previous stop. */
622 bpstat_clear (&stop_bpstat
);
625 /* This should be suitable for any targets that support threads. */
628 prepare_to_proceed (void)
631 struct target_waitstatus wait_status
;
633 /* Get the last target status returned by target_wait(). */
634 get_last_target_status (&wait_ptid
, &wait_status
);
636 /* Make sure we were stopped either at a breakpoint, or because
638 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
639 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
640 && wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
645 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
646 && !ptid_equal (inferior_ptid
, wait_ptid
))
648 /* Switched over from WAIT_PID. */
649 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
651 if (wait_pc
!= read_pc ())
653 /* Switch back to WAIT_PID thread. */
654 inferior_ptid
= wait_ptid
;
656 /* FIXME: This stuff came from switch_to_thread() in
657 thread.c (which should probably be a public function). */
658 flush_cached_frames ();
659 registers_changed ();
661 select_frame (get_current_frame ());
664 /* We return 1 to indicate that there is a breakpoint here,
665 so we need to step over it before continuing to avoid
666 hitting it straight away. */
667 if (breakpoint_here_p (wait_pc
))
675 /* Record the pc of the program the last time it stopped. This is
676 just used internally by wait_for_inferior, but need to be preserved
677 over calls to it and cleared when the inferior is started. */
678 static CORE_ADDR prev_pc
;
680 /* Basic routine for continuing the program in various fashions.
682 ADDR is the address to resume at, or -1 for resume where stopped.
683 SIGGNAL is the signal to give it, or 0 for none,
684 or -1 for act according to how it stopped.
685 STEP is nonzero if should trap after one instruction.
686 -1 means return after that and print nothing.
687 You should probably set various step_... variables
688 before calling here, if you are stepping.
690 You should call clear_proceed_status before calling proceed. */
693 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
698 step_start_function
= find_pc_function (read_pc ());
702 if (addr
== (CORE_ADDR
) -1)
704 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
705 /* There is a breakpoint at the address we will resume at,
706 step one instruction before inserting breakpoints so that
707 we do not stop right away (and report a second hit at this
710 else if (gdbarch_single_step_through_delay_p (current_gdbarch
)
711 && gdbarch_single_step_through_delay (current_gdbarch
,
712 get_current_frame ()))
713 /* We stepped onto an instruction that needs to be stepped
714 again before re-inserting the breakpoint, do so. */
723 printf_unfiltered ("infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
724 paddr_nz (addr
), siggnal
, step
);
726 /* In a multi-threaded task we may select another thread
727 and then continue or step.
729 But if the old thread was stopped at a breakpoint, it
730 will immediately cause another breakpoint stop without
731 any execution (i.e. it will report a breakpoint hit
732 incorrectly). So we must step over it first.
734 prepare_to_proceed checks the current thread against the thread
735 that reported the most recent event. If a step-over is required
736 it returns TRUE and sets the current thread to the old thread. */
737 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
741 /* We will get a trace trap after one instruction.
742 Continue it automatically and insert breakpoints then. */
746 insert_breakpoints ();
747 /* If we get here there was no call to error() in
748 insert breakpoints -- so they were inserted. */
749 breakpoints_inserted
= 1;
752 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
753 stop_signal
= siggnal
;
754 /* If this signal should not be seen by program,
755 give it zero. Used for debugging signals. */
756 else if (!signal_program
[stop_signal
])
757 stop_signal
= TARGET_SIGNAL_0
;
759 annotate_starting ();
761 /* Make sure that output from GDB appears before output from the
763 gdb_flush (gdb_stdout
);
765 /* Refresh prev_pc value just prior to resuming. This used to be
766 done in stop_stepping, however, setting prev_pc there did not handle
767 scenarios such as inferior function calls or returning from
768 a function via the return command. In those cases, the prev_pc
769 value was not set properly for subsequent commands. The prev_pc value
770 is used to initialize the starting line number in the ecs. With an
771 invalid value, the gdb next command ends up stopping at the position
772 represented by the next line table entry past our start position.
773 On platforms that generate one line table entry per line, this
774 is not a problem. However, on the ia64, the compiler generates
775 extraneous line table entries that do not increase the line number.
776 When we issue the gdb next command on the ia64 after an inferior call
777 or a return command, we often end up a few instructions forward, still
778 within the original line we started.
780 An attempt was made to have init_execution_control_state () refresh
781 the prev_pc value before calculating the line number. This approach
782 did not work because on platforms that use ptrace, the pc register
783 cannot be read unless the inferior is stopped. At that point, we
784 are not guaranteed the inferior is stopped and so the read_pc ()
785 call can fail. Setting the prev_pc value here ensures the value is
786 updated correctly when the inferior is stopped. */
787 prev_pc
= read_pc ();
789 /* Resume inferior. */
790 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
792 /* Wait for it to stop (if not standalone)
793 and in any case decode why it stopped, and act accordingly. */
794 /* Do this only if we are not using the event loop, or if the target
795 does not support asynchronous execution. */
796 if (!target_can_async_p ())
798 wait_for_inferior ();
804 /* Start remote-debugging of a machine over a serial link. */
810 init_wait_for_inferior ();
811 stop_soon
= STOP_QUIETLY
;
814 /* Always go on waiting for the target, regardless of the mode. */
815 /* FIXME: cagney/1999-09-23: At present it isn't possible to
816 indicate to wait_for_inferior that a target should timeout if
817 nothing is returned (instead of just blocking). Because of this,
818 targets expecting an immediate response need to, internally, set
819 things up so that the target_wait() is forced to eventually
821 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
822 differentiate to its caller what the state of the target is after
823 the initial open has been performed. Here we're assuming that
824 the target has stopped. It should be possible to eventually have
825 target_open() return to the caller an indication that the target
826 is currently running and GDB state should be set to the same as
828 wait_for_inferior ();
832 /* Initialize static vars when a new inferior begins. */
835 init_wait_for_inferior (void)
837 /* These are meaningless until the first time through wait_for_inferior. */
840 breakpoints_inserted
= 0;
841 breakpoint_init_inferior (inf_starting
);
843 /* Don't confuse first call to proceed(). */
844 stop_signal
= TARGET_SIGNAL_0
;
846 /* The first resume is not following a fork/vfork/exec. */
847 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
849 clear_proceed_status ();
851 stepping_past_singlestep_breakpoint
= 0;
854 /* This enum encodes possible reasons for doing a target_wait, so that
855 wfi can call target_wait in one place. (Ultimately the call will be
856 moved out of the infinite loop entirely.) */
860 infwait_normal_state
,
861 infwait_thread_hop_state
,
862 infwait_nonstep_watch_state
865 /* Why did the inferior stop? Used to print the appropriate messages
866 to the interface from within handle_inferior_event(). */
867 enum inferior_stop_reason
869 /* We don't know why. */
871 /* Step, next, nexti, stepi finished. */
873 /* Found breakpoint. */
875 /* Inferior terminated by signal. */
877 /* Inferior exited. */
879 /* Inferior received signal, and user asked to be notified. */
883 /* This structure contains what used to be local variables in
884 wait_for_inferior. Probably many of them can return to being
885 locals in handle_inferior_event. */
887 struct execution_control_state
889 struct target_waitstatus ws
;
890 struct target_waitstatus
*wp
;
893 CORE_ADDR stop_func_start
;
894 CORE_ADDR stop_func_end
;
895 char *stop_func_name
;
896 struct symtab_and_line sal
;
898 struct symtab
*current_symtab
;
899 int handling_longjmp
; /* FIXME */
901 ptid_t saved_inferior_ptid
;
902 int step_after_step_resume_breakpoint
;
903 int stepping_through_solib_after_catch
;
904 bpstat stepping_through_solib_catchpoints
;
905 int new_thread_event
;
906 struct target_waitstatus tmpstatus
;
907 enum infwait_states infwait_state
;
912 void init_execution_control_state (struct execution_control_state
*ecs
);
914 void handle_inferior_event (struct execution_control_state
*ecs
);
916 static void step_into_function (struct execution_control_state
*ecs
);
917 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
918 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
919 struct frame_id sr_id
);
920 static void stop_stepping (struct execution_control_state
*ecs
);
921 static void prepare_to_wait (struct execution_control_state
*ecs
);
922 static void keep_going (struct execution_control_state
*ecs
);
923 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
926 /* Wait for control to return from inferior to debugger.
927 If inferior gets a signal, we may decide to start it up again
928 instead of returning. That is why there is a loop in this function.
929 When this function actually returns it means the inferior
930 should be left stopped and GDB should read more commands. */
933 wait_for_inferior (void)
935 struct cleanup
*old_cleanups
;
936 struct execution_control_state ecss
;
937 struct execution_control_state
*ecs
;
940 printf_unfiltered ("infrun: wait_for_inferior\n");
942 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
943 &step_resume_breakpoint
);
945 /* wfi still stays in a loop, so it's OK just to take the address of
946 a local to get the ecs pointer. */
949 /* Fill in with reasonable starting values. */
950 init_execution_control_state (ecs
);
952 /* We'll update this if & when we switch to a new thread. */
953 previous_inferior_ptid
= inferior_ptid
;
955 overlay_cache_invalid
= 1;
957 /* We have to invalidate the registers BEFORE calling target_wait
958 because they can be loaded from the target while in target_wait.
959 This makes remote debugging a bit more efficient for those
960 targets that provide critical registers as part of their normal
963 registers_changed ();
967 if (deprecated_target_wait_hook
)
968 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
970 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
972 /* Now figure out what to do with the result of the result. */
973 handle_inferior_event (ecs
);
975 if (!ecs
->wait_some_more
)
978 do_cleanups (old_cleanups
);
981 /* Asynchronous version of wait_for_inferior. It is called by the
982 event loop whenever a change of state is detected on the file
983 descriptor corresponding to the target. It can be called more than
984 once to complete a single execution command. In such cases we need
985 to keep the state in a global variable ASYNC_ECSS. If it is the
986 last time that this function is called for a single execution
987 command, then report to the user that the inferior has stopped, and
988 do the necessary cleanups. */
990 struct execution_control_state async_ecss
;
991 struct execution_control_state
*async_ecs
;
994 fetch_inferior_event (void *client_data
)
996 static struct cleanup
*old_cleanups
;
998 async_ecs
= &async_ecss
;
1000 if (!async_ecs
->wait_some_more
)
1002 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1003 &step_resume_breakpoint
);
1005 /* Fill in with reasonable starting values. */
1006 init_execution_control_state (async_ecs
);
1008 /* We'll update this if & when we switch to a new thread. */
1009 previous_inferior_ptid
= inferior_ptid
;
1011 overlay_cache_invalid
= 1;
1013 /* We have to invalidate the registers BEFORE calling target_wait
1014 because they can be loaded from the target while in target_wait.
1015 This makes remote debugging a bit more efficient for those
1016 targets that provide critical registers as part of their normal
1017 status mechanism. */
1019 registers_changed ();
1022 if (deprecated_target_wait_hook
)
1024 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1026 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1028 /* Now figure out what to do with the result of the result. */
1029 handle_inferior_event (async_ecs
);
1031 if (!async_ecs
->wait_some_more
)
1033 /* Do only the cleanups that have been added by this
1034 function. Let the continuations for the commands do the rest,
1035 if there are any. */
1036 do_exec_cleanups (old_cleanups
);
1038 if (step_multi
&& stop_step
)
1039 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1041 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1045 /* Prepare an execution control state for looping through a
1046 wait_for_inferior-type loop. */
1049 init_execution_control_state (struct execution_control_state
*ecs
)
1051 /* ecs->another_trap? */
1052 ecs
->random_signal
= 0;
1053 ecs
->step_after_step_resume_breakpoint
= 0;
1054 ecs
->handling_longjmp
= 0; /* FIXME */
1055 ecs
->stepping_through_solib_after_catch
= 0;
1056 ecs
->stepping_through_solib_catchpoints
= NULL
;
1057 ecs
->sal
= find_pc_line (prev_pc
, 0);
1058 ecs
->current_line
= ecs
->sal
.line
;
1059 ecs
->current_symtab
= ecs
->sal
.symtab
;
1060 ecs
->infwait_state
= infwait_normal_state
;
1061 ecs
->waiton_ptid
= pid_to_ptid (-1);
1062 ecs
->wp
= &(ecs
->ws
);
1065 /* Return the cached copy of the last pid/waitstatus returned by
1066 target_wait()/deprecated_target_wait_hook(). The data is actually
1067 cached by handle_inferior_event(), which gets called immediately
1068 after target_wait()/deprecated_target_wait_hook(). */
1071 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1073 *ptidp
= target_last_wait_ptid
;
1074 *status
= target_last_waitstatus
;
1077 /* Switch thread contexts, maintaining "infrun state". */
1080 context_switch (struct execution_control_state
*ecs
)
1082 /* Caution: it may happen that the new thread (or the old one!)
1083 is not in the thread list. In this case we must not attempt
1084 to "switch context", or we run the risk that our context may
1085 be lost. This may happen as a result of the target module
1086 mishandling thread creation. */
1088 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1089 { /* Perform infrun state context switch: */
1090 /* Save infrun state for the old thread. */
1091 save_infrun_state (inferior_ptid
, prev_pc
,
1092 trap_expected
, step_resume_breakpoint
,
1094 step_range_end
, &step_frame_id
,
1095 ecs
->handling_longjmp
, ecs
->another_trap
,
1096 ecs
->stepping_through_solib_after_catch
,
1097 ecs
->stepping_through_solib_catchpoints
,
1098 ecs
->current_line
, ecs
->current_symtab
);
1100 /* Load infrun state for the new thread. */
1101 load_infrun_state (ecs
->ptid
, &prev_pc
,
1102 &trap_expected
, &step_resume_breakpoint
,
1104 &step_range_end
, &step_frame_id
,
1105 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1106 &ecs
->stepping_through_solib_after_catch
,
1107 &ecs
->stepping_through_solib_catchpoints
,
1108 &ecs
->current_line
, &ecs
->current_symtab
);
1110 inferior_ptid
= ecs
->ptid
;
1114 adjust_pc_after_break (struct execution_control_state
*ecs
)
1116 CORE_ADDR breakpoint_pc
;
1118 /* If this target does not decrement the PC after breakpoints, then
1119 we have nothing to do. */
1120 if (DECR_PC_AFTER_BREAK
== 0)
1123 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1124 we aren't, just return.
1126 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1127 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1128 by software breakpoints should be handled through the normal breakpoint
1131 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1132 different signals (SIGILL or SIGEMT for instance), but it is less
1133 clear where the PC is pointing afterwards. It may not match
1134 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1135 these signals at breakpoints (the code has been in GDB since at least
1136 1992) so I can not guess how to handle them here.
1138 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1139 would have the PC after hitting a watchpoint affected by
1140 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1141 in GDB history, and it seems unlikely to be correct, so
1142 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1144 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1147 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1150 /* Find the location where (if we've hit a breakpoint) the
1151 breakpoint would be. */
1152 breakpoint_pc
= read_pc_pid (ecs
->ptid
) - DECR_PC_AFTER_BREAK
;
1154 if (SOFTWARE_SINGLE_STEP_P ())
1156 /* When using software single-step, a SIGTRAP can only indicate
1157 an inserted breakpoint. This actually makes things
1159 if (singlestep_breakpoints_inserted_p
)
1160 /* When software single stepping, the instruction at [prev_pc]
1161 is never a breakpoint, but the instruction following
1162 [prev_pc] (in program execution order) always is. Assume
1163 that following instruction was reached and hence a software
1164 breakpoint was hit. */
1165 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1166 else if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1167 /* The inferior was free running (i.e., no single-step
1168 breakpoints inserted) and it hit a software breakpoint. */
1169 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1173 /* When using hardware single-step, a SIGTRAP is reported for
1174 both a completed single-step and a software breakpoint. Need
1175 to differentiate between the two as the latter needs
1176 adjusting but the former does not. */
1177 if (currently_stepping (ecs
))
1179 if (prev_pc
== breakpoint_pc
1180 && software_breakpoint_inserted_here_p (breakpoint_pc
))
1181 /* Hardware single-stepped a software breakpoint (as
1182 occures when the inferior is resumed with PC pointing
1183 at not-yet-hit software breakpoint). Since the
1184 breakpoint really is executed, the inferior needs to be
1185 backed up to the breakpoint address. */
1186 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1190 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1191 /* The inferior was free running (i.e., no hardware
1192 single-step and no possibility of a false SIGTRAP) and
1193 hit a software breakpoint. */
1194 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1199 /* Given an execution control state that has been freshly filled in
1200 by an event from the inferior, figure out what it means and take
1201 appropriate action. */
1203 int stepped_after_stopped_by_watchpoint
;
1206 handle_inferior_event (struct execution_control_state
*ecs
)
1208 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1209 thinking that the variable stepped_after_stopped_by_watchpoint
1210 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1211 defined in the file "config/pa/nm-hppah.h", accesses the variable
1212 indirectly. Mutter something rude about the HP merge. */
1213 int sw_single_step_trap_p
= 0;
1214 int stopped_by_watchpoint
= -1; /* Mark as unknown. */
1216 /* Cache the last pid/waitstatus. */
1217 target_last_wait_ptid
= ecs
->ptid
;
1218 target_last_waitstatus
= *ecs
->wp
;
1220 adjust_pc_after_break (ecs
);
1222 switch (ecs
->infwait_state
)
1224 case infwait_thread_hop_state
:
1226 printf_unfiltered ("infrun: infwait_thread_hop_state\n");
1227 /* Cancel the waiton_ptid. */
1228 ecs
->waiton_ptid
= pid_to_ptid (-1);
1231 case infwait_normal_state
:
1233 printf_unfiltered ("infrun: infwait_normal_state\n");
1234 stepped_after_stopped_by_watchpoint
= 0;
1237 case infwait_nonstep_watch_state
:
1239 printf_unfiltered ("infrun: infwait_nonstep_watch_state\n");
1240 insert_breakpoints ();
1242 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1243 handle things like signals arriving and other things happening
1244 in combination correctly? */
1245 stepped_after_stopped_by_watchpoint
= 1;
1249 internal_error (__FILE__
, __LINE__
, "bad switch");
1251 ecs
->infwait_state
= infwait_normal_state
;
1253 flush_cached_frames ();
1255 /* If it's a new process, add it to the thread database */
1257 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1258 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1259 && !in_thread_list (ecs
->ptid
));
1261 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1262 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1264 add_thread (ecs
->ptid
);
1266 ui_out_text (uiout
, "[New ");
1267 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1268 ui_out_text (uiout
, "]\n");
1271 switch (ecs
->ws
.kind
)
1273 case TARGET_WAITKIND_LOADED
:
1275 printf_unfiltered ("infrun: TARGET_WAITKIND_LOADED\n");
1276 /* Ignore gracefully during startup of the inferior, as it
1277 might be the shell which has just loaded some objects,
1278 otherwise add the symbols for the newly loaded objects. */
1280 if (stop_soon
== NO_STOP_QUIETLY
)
1282 /* Remove breakpoints, SOLIB_ADD might adjust
1283 breakpoint addresses via breakpoint_re_set. */
1284 if (breakpoints_inserted
)
1285 remove_breakpoints ();
1287 /* Check for any newly added shared libraries if we're
1288 supposed to be adding them automatically. Switch
1289 terminal for any messages produced by
1290 breakpoint_re_set. */
1291 target_terminal_ours_for_output ();
1292 /* NOTE: cagney/2003-11-25: Make certain that the target
1293 stack's section table is kept up-to-date. Architectures,
1294 (e.g., PPC64), use the section table to perform
1295 operations such as address => section name and hence
1296 require the table to contain all sections (including
1297 those found in shared libraries). */
1298 /* NOTE: cagney/2003-11-25: Pass current_target and not
1299 exec_ops to SOLIB_ADD. This is because current GDB is
1300 only tooled to propagate section_table changes out from
1301 the "current_target" (see target_resize_to_sections), and
1302 not up from the exec stratum. This, of course, isn't
1303 right. "infrun.c" should only interact with the
1304 exec/process stratum, instead relying on the target stack
1305 to propagate relevant changes (stop, section table
1306 changed, ...) up to other layers. */
1307 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1308 target_terminal_inferior ();
1310 /* Reinsert breakpoints and continue. */
1311 if (breakpoints_inserted
)
1312 insert_breakpoints ();
1315 resume (0, TARGET_SIGNAL_0
);
1316 prepare_to_wait (ecs
);
1319 case TARGET_WAITKIND_SPURIOUS
:
1321 printf_unfiltered ("infrun: TARGET_WAITKIND_SPURIOUS\n");
1322 resume (0, TARGET_SIGNAL_0
);
1323 prepare_to_wait (ecs
);
1326 case TARGET_WAITKIND_EXITED
:
1328 printf_unfiltered ("infrun: TARGET_WAITKIND_EXITED\n");
1329 target_terminal_ours (); /* Must do this before mourn anyway */
1330 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1332 /* Record the exit code in the convenience variable $_exitcode, so
1333 that the user can inspect this again later. */
1334 set_internalvar (lookup_internalvar ("_exitcode"),
1335 value_from_longest (builtin_type_int
,
1336 (LONGEST
) ecs
->ws
.value
.integer
));
1337 gdb_flush (gdb_stdout
);
1338 target_mourn_inferior ();
1339 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1340 stop_print_frame
= 0;
1341 stop_stepping (ecs
);
1344 case TARGET_WAITKIND_SIGNALLED
:
1346 printf_unfiltered ("infrun: TARGET_WAITKIND_SIGNALLED\n");
1347 stop_print_frame
= 0;
1348 stop_signal
= ecs
->ws
.value
.sig
;
1349 target_terminal_ours (); /* Must do this before mourn anyway */
1351 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1352 reach here unless the inferior is dead. However, for years
1353 target_kill() was called here, which hints that fatal signals aren't
1354 really fatal on some systems. If that's true, then some changes
1356 target_mourn_inferior ();
1358 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1359 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1360 stop_stepping (ecs
);
1363 /* The following are the only cases in which we keep going;
1364 the above cases end in a continue or goto. */
1365 case TARGET_WAITKIND_FORKED
:
1366 case TARGET_WAITKIND_VFORKED
:
1368 printf_unfiltered ("infrun: TARGET_WAITKIND_FORKED\n");
1369 stop_signal
= TARGET_SIGNAL_TRAP
;
1370 pending_follow
.kind
= ecs
->ws
.kind
;
1372 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1373 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1375 stop_pc
= read_pc ();
1377 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1379 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1381 /* If no catchpoint triggered for this, then keep going. */
1382 if (ecs
->random_signal
)
1384 stop_signal
= TARGET_SIGNAL_0
;
1388 goto process_event_stop_test
;
1390 case TARGET_WAITKIND_EXECD
:
1392 printf_unfiltered ("infrun: TARGET_WAITKIND_EXECED\n");
1393 stop_signal
= TARGET_SIGNAL_TRAP
;
1395 /* NOTE drow/2002-12-05: This code should be pushed down into the
1396 target_wait function. Until then following vfork on HP/UX 10.20
1397 is probably broken by this. Of course, it's broken anyway. */
1398 /* Is this a target which reports multiple exec events per actual
1399 call to exec()? (HP-UX using ptrace does, for example.) If so,
1400 ignore all but the last one. Just resume the exec'r, and wait
1401 for the next exec event. */
1402 if (inferior_ignoring_leading_exec_events
)
1404 inferior_ignoring_leading_exec_events
--;
1405 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1406 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1408 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1409 prepare_to_wait (ecs
);
1412 inferior_ignoring_leading_exec_events
=
1413 target_reported_exec_events_per_exec_call () - 1;
1415 pending_follow
.execd_pathname
=
1416 savestring (ecs
->ws
.value
.execd_pathname
,
1417 strlen (ecs
->ws
.value
.execd_pathname
));
1419 /* This causes the eventpoints and symbol table to be reset. Must
1420 do this now, before trying to determine whether to stop. */
1421 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1422 xfree (pending_follow
.execd_pathname
);
1424 stop_pc
= read_pc_pid (ecs
->ptid
);
1425 ecs
->saved_inferior_ptid
= inferior_ptid
;
1426 inferior_ptid
= ecs
->ptid
;
1428 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1430 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1431 inferior_ptid
= ecs
->saved_inferior_ptid
;
1433 /* If no catchpoint triggered for this, then keep going. */
1434 if (ecs
->random_signal
)
1436 stop_signal
= TARGET_SIGNAL_0
;
1440 goto process_event_stop_test
;
1442 /* Be careful not to try to gather much state about a thread
1443 that's in a syscall. It's frequently a losing proposition. */
1444 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1446 printf_unfiltered ("infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1447 resume (0, TARGET_SIGNAL_0
);
1448 prepare_to_wait (ecs
);
1451 /* Before examining the threads further, step this thread to
1452 get it entirely out of the syscall. (We get notice of the
1453 event when the thread is just on the verge of exiting a
1454 syscall. Stepping one instruction seems to get it back
1456 case TARGET_WAITKIND_SYSCALL_RETURN
:
1458 printf_unfiltered ("infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1459 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1460 prepare_to_wait (ecs
);
1463 case TARGET_WAITKIND_STOPPED
:
1465 printf_unfiltered ("infrun: TARGET_WAITKIND_STOPPED\n");
1466 stop_signal
= ecs
->ws
.value
.sig
;
1469 /* We had an event in the inferior, but we are not interested
1470 in handling it at this level. The lower layers have already
1471 done what needs to be done, if anything.
1473 One of the possible circumstances for this is when the
1474 inferior produces output for the console. The inferior has
1475 not stopped, and we are ignoring the event. Another possible
1476 circumstance is any event which the lower level knows will be
1477 reported multiple times without an intervening resume. */
1478 case TARGET_WAITKIND_IGNORE
:
1480 printf_unfiltered ("infrun: TARGET_WAITKIND_IGNORE\n");
1481 prepare_to_wait (ecs
);
1485 /* We may want to consider not doing a resume here in order to give
1486 the user a chance to play with the new thread. It might be good
1487 to make that a user-settable option. */
1489 /* At this point, all threads are stopped (happens automatically in
1490 either the OS or the native code). Therefore we need to continue
1491 all threads in order to make progress. */
1492 if (ecs
->new_thread_event
)
1494 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1495 prepare_to_wait (ecs
);
1499 stop_pc
= read_pc_pid (ecs
->ptid
);
1502 printf_unfiltered ("infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc
));
1504 if (stepping_past_singlestep_breakpoint
)
1506 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1507 && singlestep_breakpoints_inserted_p
);
1508 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1509 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1511 stepping_past_singlestep_breakpoint
= 0;
1513 /* We've either finished single-stepping past the single-step
1514 breakpoint, or stopped for some other reason. It would be nice if
1515 we could tell, but we can't reliably. */
1516 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1519 printf_unfiltered ("infrun: stepping_past_singlestep_breakpoint\n");
1520 /* Pull the single step breakpoints out of the target. */
1521 SOFTWARE_SINGLE_STEP (0, 0);
1522 singlestep_breakpoints_inserted_p
= 0;
1524 ecs
->random_signal
= 0;
1526 ecs
->ptid
= saved_singlestep_ptid
;
1527 context_switch (ecs
);
1528 if (deprecated_context_hook
)
1529 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1531 resume (1, TARGET_SIGNAL_0
);
1532 prepare_to_wait (ecs
);
1537 stepping_past_singlestep_breakpoint
= 0;
1539 /* See if a thread hit a thread-specific breakpoint that was meant for
1540 another thread. If so, then step that thread past the breakpoint,
1543 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1545 int thread_hop_needed
= 0;
1547 /* Check if a regular breakpoint has been hit before checking
1548 for a potential single step breakpoint. Otherwise, GDB will
1549 not see this breakpoint hit when stepping onto breakpoints. */
1550 if (breakpoints_inserted
&& breakpoint_here_p (stop_pc
))
1552 ecs
->random_signal
= 0;
1553 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1554 thread_hop_needed
= 1;
1556 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1558 ecs
->random_signal
= 0;
1559 /* The call to in_thread_list is necessary because PTIDs sometimes
1560 change when we go from single-threaded to multi-threaded. If
1561 the singlestep_ptid is still in the list, assume that it is
1562 really different from ecs->ptid. */
1563 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1564 && in_thread_list (singlestep_ptid
))
1566 thread_hop_needed
= 1;
1567 stepping_past_singlestep_breakpoint
= 1;
1568 saved_singlestep_ptid
= singlestep_ptid
;
1572 if (thread_hop_needed
)
1577 printf_unfiltered ("infrun: thread_hop_needed\n");
1579 /* Saw a breakpoint, but it was hit by the wrong thread.
1582 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1584 /* Pull the single step breakpoints out of the target. */
1585 SOFTWARE_SINGLE_STEP (0, 0);
1586 singlestep_breakpoints_inserted_p
= 0;
1589 remove_status
= remove_breakpoints ();
1590 /* Did we fail to remove breakpoints? If so, try
1591 to set the PC past the bp. (There's at least
1592 one situation in which we can fail to remove
1593 the bp's: On HP-UX's that use ttrace, we can't
1594 change the address space of a vforking child
1595 process until the child exits (well, okay, not
1596 then either :-) or execs. */
1597 if (remove_status
!= 0)
1599 /* FIXME! This is obviously non-portable! */
1600 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1601 /* We need to restart all the threads now,
1602 * unles we're running in scheduler-locked mode.
1603 * Use currently_stepping to determine whether to
1606 /* FIXME MVS: is there any reason not to call resume()? */
1607 if (scheduler_mode
== schedlock_on
)
1608 target_resume (ecs
->ptid
,
1609 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1611 target_resume (RESUME_ALL
,
1612 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1613 prepare_to_wait (ecs
);
1618 breakpoints_inserted
= 0;
1619 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1620 context_switch (ecs
);
1621 ecs
->waiton_ptid
= ecs
->ptid
;
1622 ecs
->wp
= &(ecs
->ws
);
1623 ecs
->another_trap
= 1;
1625 ecs
->infwait_state
= infwait_thread_hop_state
;
1627 registers_changed ();
1631 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1633 sw_single_step_trap_p
= 1;
1634 ecs
->random_signal
= 0;
1638 ecs
->random_signal
= 1;
1640 /* See if something interesting happened to the non-current thread. If
1641 so, then switch to that thread. */
1642 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1645 printf_unfiltered ("infrun: context switch\n");
1647 context_switch (ecs
);
1649 if (deprecated_context_hook
)
1650 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1652 flush_cached_frames ();
1655 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1657 /* Pull the single step breakpoints out of the target. */
1658 SOFTWARE_SINGLE_STEP (0, 0);
1659 singlestep_breakpoints_inserted_p
= 0;
1662 /* It may not be necessary to disable the watchpoint to stop over
1663 it. For example, the PA can (with some kernel cooperation)
1664 single step over a watchpoint without disabling the watchpoint. */
1665 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1668 printf_unfiltered ("infrun: STOPPED_BY_WATCHPOINT\n");
1670 prepare_to_wait (ecs
);
1674 /* It is far more common to need to disable a watchpoint to step
1675 the inferior over it. FIXME. What else might a debug
1676 register or page protection watchpoint scheme need here? */
1677 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1679 /* At this point, we are stopped at an instruction which has
1680 attempted to write to a piece of memory under control of
1681 a watchpoint. The instruction hasn't actually executed
1682 yet. If we were to evaluate the watchpoint expression
1683 now, we would get the old value, and therefore no change
1684 would seem to have occurred.
1686 In order to make watchpoints work `right', we really need
1687 to complete the memory write, and then evaluate the
1688 watchpoint expression. The following code does that by
1689 removing the watchpoint (actually, all watchpoints and
1690 breakpoints), single-stepping the target, re-inserting
1691 watchpoints, and then falling through to let normal
1692 single-step processing handle proceed. Since this
1693 includes evaluating watchpoints, things will come to a
1694 stop in the correct manner. */
1697 printf_unfiltered ("infrun: STOPPED_BY_WATCHPOINT\n");
1698 remove_breakpoints ();
1699 registers_changed ();
1700 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1702 ecs
->waiton_ptid
= ecs
->ptid
;
1703 ecs
->wp
= &(ecs
->ws
);
1704 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1705 prepare_to_wait (ecs
);
1709 /* It may be possible to simply continue after a watchpoint. */
1710 if (HAVE_CONTINUABLE_WATCHPOINT
)
1711 stopped_by_watchpoint
= STOPPED_BY_WATCHPOINT (ecs
->ws
);
1713 ecs
->stop_func_start
= 0;
1714 ecs
->stop_func_end
= 0;
1715 ecs
->stop_func_name
= 0;
1716 /* Don't care about return value; stop_func_start and stop_func_name
1717 will both be 0 if it doesn't work. */
1718 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1719 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1720 ecs
->stop_func_start
+= DEPRECATED_FUNCTION_START_OFFSET
;
1721 ecs
->another_trap
= 0;
1722 bpstat_clear (&stop_bpstat
);
1724 stop_stack_dummy
= 0;
1725 stop_print_frame
= 1;
1726 ecs
->random_signal
= 0;
1727 stopped_by_random_signal
= 0;
1728 breakpoints_failed
= 0;
1730 if (stop_signal
== TARGET_SIGNAL_TRAP
1732 && gdbarch_single_step_through_delay_p (current_gdbarch
)
1733 && currently_stepping (ecs
))
1735 /* We're trying to step of a breakpoint. Turns out that we're
1736 also on an instruction that needs to be stepped multiple
1737 times before it's been fully executing. E.g., architectures
1738 with a delay slot. It needs to be stepped twice, once for
1739 the instruction and once for the delay slot. */
1740 int step_through_delay
1741 = gdbarch_single_step_through_delay (current_gdbarch
,
1742 get_current_frame ());
1743 if (debug_infrun
&& step_through_delay
)
1744 printf_unfiltered ("infrun: step through delay\n");
1745 if (step_range_end
== 0 && step_through_delay
)
1747 /* The user issued a continue when stopped at a breakpoint.
1748 Set up for another trap and get out of here. */
1749 ecs
->another_trap
= 1;
1753 else if (step_through_delay
)
1755 /* The user issued a step when stopped at a breakpoint.
1756 Maybe we should stop, maybe we should not - the delay
1757 slot *might* correspond to a line of source. In any
1758 case, don't decide that here, just set ecs->another_trap,
1759 making sure we single-step again before breakpoints are
1761 ecs
->another_trap
= 1;
1765 /* Look at the cause of the stop, and decide what to do.
1766 The alternatives are:
1767 1) break; to really stop and return to the debugger,
1768 2) drop through to start up again
1769 (set ecs->another_trap to 1 to single step once)
1770 3) set ecs->random_signal to 1, and the decision between 1 and 2
1771 will be made according to the signal handling tables. */
1773 /* First, distinguish signals caused by the debugger from signals
1774 that have to do with the program's own actions. Note that
1775 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1776 on the operating system version. Here we detect when a SIGILL or
1777 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1778 something similar for SIGSEGV, since a SIGSEGV will be generated
1779 when we're trying to execute a breakpoint instruction on a
1780 non-executable stack. This happens for call dummy breakpoints
1781 for architectures like SPARC that place call dummies on the
1784 if (stop_signal
== TARGET_SIGNAL_TRAP
1785 || (breakpoints_inserted
1786 && (stop_signal
== TARGET_SIGNAL_ILL
1787 || stop_signal
== TARGET_SIGNAL_SEGV
1788 || stop_signal
== TARGET_SIGNAL_EMT
))
1789 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1791 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1794 printf_unfiltered ("infrun: stopped\n");
1795 stop_print_frame
= 0;
1796 stop_stepping (ecs
);
1800 /* This is originated from start_remote(), start_inferior() and
1801 shared libraries hook functions. */
1802 if (stop_soon
== STOP_QUIETLY
)
1805 printf_unfiltered ("infrun: quietly stopped\n");
1806 stop_stepping (ecs
);
1810 /* This originates from attach_command(). We need to overwrite
1811 the stop_signal here, because some kernels don't ignore a
1812 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1813 See more comments in inferior.h. */
1814 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1816 stop_stepping (ecs
);
1817 if (stop_signal
== TARGET_SIGNAL_STOP
)
1818 stop_signal
= TARGET_SIGNAL_0
;
1822 /* Don't even think about breakpoints if just proceeded over a
1824 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
)
1827 printf_unfiltered ("infrun: trap expected\n");
1828 bpstat_clear (&stop_bpstat
);
1832 /* See if there is a breakpoint at the current PC. */
1833 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
,
1834 stopped_by_watchpoint
);
1836 /* Following in case break condition called a
1838 stop_print_frame
= 1;
1841 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1842 at one stage in the past included checks for an inferior
1843 function call's call dummy's return breakpoint. The original
1844 comment, that went with the test, read:
1846 ``End of a stack dummy. Some systems (e.g. Sony news) give
1847 another signal besides SIGTRAP, so check here as well as
1850 If someone ever tries to get get call dummys on a
1851 non-executable stack to work (where the target would stop
1852 with something like a SIGSEGV), then those tests might need
1853 to be re-instated. Given, however, that the tests were only
1854 enabled when momentary breakpoints were not being used, I
1855 suspect that it won't be the case.
1857 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1858 be necessary for call dummies on a non-executable stack on
1861 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1863 = !(bpstat_explains_signal (stop_bpstat
)
1865 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1868 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1869 if (!ecs
->random_signal
)
1870 stop_signal
= TARGET_SIGNAL_TRAP
;
1874 /* When we reach this point, we've pretty much decided
1875 that the reason for stopping must've been a random
1876 (unexpected) signal. */
1879 ecs
->random_signal
= 1;
1881 process_event_stop_test
:
1882 /* For the program's own signals, act according to
1883 the signal handling tables. */
1885 if (ecs
->random_signal
)
1887 /* Signal not for debugging purposes. */
1891 printf_unfiltered ("infrun: random signal %d\n", stop_signal
);
1893 stopped_by_random_signal
= 1;
1895 if (signal_print
[stop_signal
])
1898 target_terminal_ours_for_output ();
1899 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1901 if (signal_stop
[stop_signal
])
1903 stop_stepping (ecs
);
1906 /* If not going to stop, give terminal back
1907 if we took it away. */
1909 target_terminal_inferior ();
1911 /* Clear the signal if it should not be passed. */
1912 if (signal_program
[stop_signal
] == 0)
1913 stop_signal
= TARGET_SIGNAL_0
;
1915 if (prev_pc
== read_pc ()
1916 && !breakpoints_inserted
1917 && breakpoint_here_p (read_pc ())
1918 && step_resume_breakpoint
== NULL
)
1920 /* We were just starting a new sequence, attempting to
1921 single-step off of a breakpoint and expecting a SIGTRAP.
1922 Intead this signal arrives. This signal will take us out
1923 of the stepping range so GDB needs to remember to, when
1924 the signal handler returns, resume stepping off that
1926 /* To simplify things, "continue" is forced to use the same
1927 code paths as single-step - set a breakpoint at the
1928 signal return address and then, once hit, step off that
1930 insert_step_resume_breakpoint_at_frame (get_current_frame ());
1931 ecs
->step_after_step_resume_breakpoint
= 1;
1933 else if (step_range_end
!= 0
1934 && stop_signal
!= TARGET_SIGNAL_0
1935 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
1936 && frame_id_eq (get_frame_id (get_current_frame ()),
1939 /* The inferior is about to take a signal that will take it
1940 out of the single step range. Set a breakpoint at the
1941 current PC (which is presumably where the signal handler
1942 will eventually return) and then allow the inferior to
1945 Note that this is only needed for a signal delivered
1946 while in the single-step range. Nested signals aren't a
1947 problem as they eventually all return. */
1948 insert_step_resume_breakpoint_at_frame (get_current_frame ());
1954 /* Handle cases caused by hitting a breakpoint. */
1956 CORE_ADDR jmp_buf_pc
;
1957 struct bpstat_what what
;
1959 what
= bpstat_what (stop_bpstat
);
1961 if (what
.call_dummy
)
1963 stop_stack_dummy
= 1;
1966 switch (what
.main_action
)
1968 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
1969 /* If we hit the breakpoint at longjmp, disable it for the
1970 duration of this command. Then, install a temporary
1971 breakpoint at the target of the jmp_buf. */
1973 printf_unfiltered ("infrun: BPSTATE_WHAT_SET_LONGJMP_RESUME\n");
1974 disable_longjmp_breakpoint ();
1975 remove_breakpoints ();
1976 breakpoints_inserted
= 0;
1977 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
1983 /* Need to blow away step-resume breakpoint, as it
1984 interferes with us */
1985 if (step_resume_breakpoint
!= NULL
)
1987 delete_step_resume_breakpoint (&step_resume_breakpoint
);
1990 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
1991 ecs
->handling_longjmp
= 1; /* FIXME */
1995 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
1996 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
1998 printf_unfiltered ("infrun: BPSTATE_WHAT_CLEAR_LONGJMP_RESUME\n");
1999 remove_breakpoints ();
2000 breakpoints_inserted
= 0;
2001 disable_longjmp_breakpoint ();
2002 ecs
->handling_longjmp
= 0; /* FIXME */
2003 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2005 /* else fallthrough */
2007 case BPSTAT_WHAT_SINGLE
:
2009 printf_unfiltered ("infrun: BPSTATE_WHAT_SINGLE\n");
2010 if (breakpoints_inserted
)
2012 remove_breakpoints ();
2014 breakpoints_inserted
= 0;
2015 ecs
->another_trap
= 1;
2016 /* Still need to check other stuff, at least the case
2017 where we are stepping and step out of the right range. */
2020 case BPSTAT_WHAT_STOP_NOISY
:
2022 printf_unfiltered ("infrun: BPSTATE_WHAT_STOP_NOISY\n");
2023 stop_print_frame
= 1;
2025 /* We are about to nuke the step_resume_breakpointt via the
2026 cleanup chain, so no need to worry about it here. */
2028 stop_stepping (ecs
);
2031 case BPSTAT_WHAT_STOP_SILENT
:
2033 printf_unfiltered ("infrun: BPSTATE_WHAT_STOP_SILENT\n");
2034 stop_print_frame
= 0;
2036 /* We are about to nuke the step_resume_breakpoin via the
2037 cleanup chain, so no need to worry about it here. */
2039 stop_stepping (ecs
);
2042 case BPSTAT_WHAT_STEP_RESUME
:
2043 /* This proably demands a more elegant solution, but, yeah
2046 This function's use of the simple variable
2047 step_resume_breakpoint doesn't seem to accomodate
2048 simultaneously active step-resume bp's, although the
2049 breakpoint list certainly can.
2051 If we reach here and step_resume_breakpoint is already
2052 NULL, then apparently we have multiple active
2053 step-resume bp's. We'll just delete the breakpoint we
2054 stopped at, and carry on.
2056 Correction: what the code currently does is delete a
2057 step-resume bp, but it makes no effort to ensure that
2058 the one deleted is the one currently stopped at. MVS */
2061 printf_unfiltered ("infrun: BPSTATE_WHAT_STEP_RESUME\n");
2063 if (step_resume_breakpoint
== NULL
)
2065 step_resume_breakpoint
=
2066 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2068 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2069 if (ecs
->step_after_step_resume_breakpoint
)
2071 /* Back when the step-resume breakpoint was inserted, we
2072 were trying to single-step off a breakpoint. Go back
2074 ecs
->step_after_step_resume_breakpoint
= 0;
2075 remove_breakpoints ();
2076 breakpoints_inserted
= 0;
2077 ecs
->another_trap
= 1;
2083 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2085 printf_unfiltered ("infrun: BPSTATE_WHAT_THROUGH_SIGTRAMP\n");
2086 /* If were waiting for a trap, hitting the step_resume_break
2087 doesn't count as getting it. */
2089 ecs
->another_trap
= 1;
2092 case BPSTAT_WHAT_CHECK_SHLIBS
:
2093 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2097 printf_unfiltered ("infrun: BPSTATE_WHAT_CHECK_SHLIBS\n");
2098 /* Remove breakpoints, we eventually want to step over the
2099 shlib event breakpoint, and SOLIB_ADD might adjust
2100 breakpoint addresses via breakpoint_re_set. */
2101 if (breakpoints_inserted
)
2102 remove_breakpoints ();
2103 breakpoints_inserted
= 0;
2105 /* Check for any newly added shared libraries if we're
2106 supposed to be adding them automatically. Switch
2107 terminal for any messages produced by
2108 breakpoint_re_set. */
2109 target_terminal_ours_for_output ();
2110 /* NOTE: cagney/2003-11-25: Make certain that the target
2111 stack's section table is kept up-to-date. Architectures,
2112 (e.g., PPC64), use the section table to perform
2113 operations such as address => section name and hence
2114 require the table to contain all sections (including
2115 those found in shared libraries). */
2116 /* NOTE: cagney/2003-11-25: Pass current_target and not
2117 exec_ops to SOLIB_ADD. This is because current GDB is
2118 only tooled to propagate section_table changes out from
2119 the "current_target" (see target_resize_to_sections), and
2120 not up from the exec stratum. This, of course, isn't
2121 right. "infrun.c" should only interact with the
2122 exec/process stratum, instead relying on the target stack
2123 to propagate relevant changes (stop, section table
2124 changed, ...) up to other layers. */
2125 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2126 target_terminal_inferior ();
2128 /* Try to reenable shared library breakpoints, additional
2129 code segments in shared libraries might be mapped in now. */
2130 re_enable_breakpoints_in_shlibs ();
2132 /* If requested, stop when the dynamic linker notifies
2133 gdb of events. This allows the user to get control
2134 and place breakpoints in initializer routines for
2135 dynamically loaded objects (among other things). */
2136 if (stop_on_solib_events
|| stop_stack_dummy
)
2138 stop_stepping (ecs
);
2142 /* If we stopped due to an explicit catchpoint, then the
2143 (see above) call to SOLIB_ADD pulled in any symbols
2144 from a newly-loaded library, if appropriate.
2146 We do want the inferior to stop, but not where it is
2147 now, which is in the dynamic linker callback. Rather,
2148 we would like it stop in the user's program, just after
2149 the call that caused this catchpoint to trigger. That
2150 gives the user a more useful vantage from which to
2151 examine their program's state. */
2152 else if (what
.main_action
2153 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2155 /* ??rehrauer: If I could figure out how to get the
2156 right return PC from here, we could just set a temp
2157 breakpoint and resume. I'm not sure we can without
2158 cracking open the dld's shared libraries and sniffing
2159 their unwind tables and text/data ranges, and that's
2160 not a terribly portable notion.
2162 Until that time, we must step the inferior out of the
2163 dld callback, and also out of the dld itself (and any
2164 code or stubs in libdld.sl, such as "shl_load" and
2165 friends) until we reach non-dld code. At that point,
2166 we can stop stepping. */
2167 bpstat_get_triggered_catchpoints (stop_bpstat
,
2169 stepping_through_solib_catchpoints
);
2170 ecs
->stepping_through_solib_after_catch
= 1;
2172 /* Be sure to lift all breakpoints, so the inferior does
2173 actually step past this point... */
2174 ecs
->another_trap
= 1;
2179 /* We want to step over this breakpoint, then keep going. */
2180 ecs
->another_trap
= 1;
2187 case BPSTAT_WHAT_LAST
:
2188 /* Not a real code, but listed here to shut up gcc -Wall. */
2190 case BPSTAT_WHAT_KEEP_CHECKING
:
2195 /* We come here if we hit a breakpoint but should not
2196 stop for it. Possibly we also were stepping
2197 and should stop for that. So fall through and
2198 test for stepping. But, if not stepping,
2201 /* Are we stepping to get the inferior out of the dynamic
2202 linker's hook (and possibly the dld itself) after catching
2204 if (ecs
->stepping_through_solib_after_catch
)
2206 #if defined(SOLIB_ADD)
2207 /* Have we reached our destination? If not, keep going. */
2208 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2211 printf_unfiltered ("infrun: stepping in dynamic linker\n");
2212 ecs
->another_trap
= 1;
2218 printf_unfiltered ("infrun: step past dynamic linker\n");
2219 /* Else, stop and report the catchpoint(s) whose triggering
2220 caused us to begin stepping. */
2221 ecs
->stepping_through_solib_after_catch
= 0;
2222 bpstat_clear (&stop_bpstat
);
2223 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2224 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2225 stop_print_frame
= 1;
2226 stop_stepping (ecs
);
2230 if (step_resume_breakpoint
)
2233 printf_unfiltered ("infrun: step-resume breakpoint\n");
2235 /* Having a step-resume breakpoint overrides anything
2236 else having to do with stepping commands until
2237 that breakpoint is reached. */
2242 if (step_range_end
== 0)
2245 printf_unfiltered ("infrun: no stepping, continue\n");
2246 /* Likewise if we aren't even stepping. */
2251 /* If stepping through a line, keep going if still within it.
2253 Note that step_range_end is the address of the first instruction
2254 beyond the step range, and NOT the address of the last instruction
2256 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2259 printf_unfiltered ("infrun: stepping inside range [0x%s-0x%s]\n",
2260 paddr_nz (step_range_start
),
2261 paddr_nz (step_range_end
));
2266 /* We stepped out of the stepping range. */
2268 /* If we are stepping at the source level and entered the runtime
2269 loader dynamic symbol resolution code, we keep on single stepping
2270 until we exit the run time loader code and reach the callee's
2272 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2273 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2275 CORE_ADDR pc_after_resolver
=
2276 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2279 printf_unfiltered ("infrun: stepped into dynsym resolve code\n");
2281 if (pc_after_resolver
)
2283 /* Set up a step-resume breakpoint at the address
2284 indicated by SKIP_SOLIB_RESOLVER. */
2285 struct symtab_and_line sr_sal
;
2287 sr_sal
.pc
= pc_after_resolver
;
2289 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2296 if (step_range_end
!= 1
2297 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2298 || step_over_calls
== STEP_OVER_ALL
)
2299 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2302 printf_unfiltered ("infrun: stepped into signal trampoline\n");
2303 /* The inferior, while doing a "step" or "next", has ended up in
2304 a signal trampoline (either by a signal being delivered or by
2305 the signal handler returning). Just single-step until the
2306 inferior leaves the trampoline (either by calling the handler
2312 if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2314 /* It's a subroutine call. */
2315 CORE_ADDR real_stop_pc
;
2318 printf_unfiltered ("infrun: stepped into subroutine\n");
2320 if ((step_over_calls
== STEP_OVER_NONE
)
2321 || ((step_range_end
== 1)
2322 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2324 /* I presume that step_over_calls is only 0 when we're
2325 supposed to be stepping at the assembly language level
2326 ("stepi"). Just stop. */
2327 /* Also, maybe we just did a "nexti" inside a prolog, so we
2328 thought it was a subroutine call but it was not. Stop as
2331 print_stop_reason (END_STEPPING_RANGE
, 0);
2332 stop_stepping (ecs
);
2336 if (step_over_calls
== STEP_OVER_ALL
)
2338 /* We're doing a "next", set a breakpoint at callee's return
2339 address (the address at which the caller will
2341 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2346 /* If we are in a function call trampoline (a stub between the
2347 calling routine and the real function), locate the real
2348 function. That's what tells us (a) whether we want to step
2349 into it at all, and (b) what prologue we want to run to the
2350 end of, if we do step into it. */
2351 real_stop_pc
= skip_language_trampoline (stop_pc
);
2352 if (real_stop_pc
== 0)
2353 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2354 if (real_stop_pc
!= 0)
2355 ecs
->stop_func_start
= real_stop_pc
;
2357 if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
))
2359 struct symtab_and_line sr_sal
;
2361 sr_sal
.pc
= ecs
->stop_func_start
;
2363 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2368 /* If we have line number information for the function we are
2369 thinking of stepping into, step into it.
2371 If there are several symtabs at that PC (e.g. with include
2372 files), just want to know whether *any* of them have line
2373 numbers. find_pc_line handles this. */
2375 struct symtab_and_line tmp_sal
;
2377 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2378 if (tmp_sal
.line
!= 0)
2380 step_into_function (ecs
);
2385 /* If we have no line number and the step-stop-if-no-debug is
2386 set, we stop the step so that the user has a chance to switch
2387 in assembly mode. */
2388 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2391 print_stop_reason (END_STEPPING_RANGE
, 0);
2392 stop_stepping (ecs
);
2396 /* Set a breakpoint at callee's return address (the address at
2397 which the caller will resume). */
2398 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2403 /* If we're in the return path from a shared library trampoline,
2404 we want to proceed through the trampoline when stepping. */
2405 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2407 /* Determine where this trampoline returns. */
2408 CORE_ADDR real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2411 printf_unfiltered ("infrun: stepped into solib return tramp\n");
2413 /* Only proceed through if we know where it's going. */
2416 /* And put the step-breakpoint there and go until there. */
2417 struct symtab_and_line sr_sal
;
2419 init_sal (&sr_sal
); /* initialize to zeroes */
2420 sr_sal
.pc
= real_stop_pc
;
2421 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2423 /* Do not specify what the fp should be when we stop since
2424 on some machines the prologue is where the new fp value
2426 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2428 /* Restart without fiddling with the step ranges or
2435 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2436 the trampoline processing logic, however, there are some trampolines
2437 that have no names, so we should do trampoline handling first. */
2438 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2439 && ecs
->stop_func_name
== NULL
)
2442 printf_unfiltered ("infrun: stepped into undebuggable function\n");
2444 /* The inferior just stepped into, or returned to, an
2445 undebuggable function (where there is no symbol, not even a
2446 minimal symbol, corresponding to the address where the
2447 inferior stopped). Since we want to skip this kind of code,
2448 we keep going until the inferior returns from this
2450 if (step_stop_if_no_debug
)
2452 /* If we have no line number and the step-stop-if-no-debug
2453 is set, we stop the step so that the user has a chance to
2454 switch in assembly mode. */
2456 print_stop_reason (END_STEPPING_RANGE
, 0);
2457 stop_stepping (ecs
);
2462 /* Set a breakpoint at callee's return address (the address
2463 at which the caller will resume). */
2464 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2470 if (step_range_end
== 1)
2472 /* It is stepi or nexti. We always want to stop stepping after
2475 printf_unfiltered ("infrun: stepi/nexti\n");
2477 print_stop_reason (END_STEPPING_RANGE
, 0);
2478 stop_stepping (ecs
);
2482 ecs
->sal
= find_pc_line (stop_pc
, 0);
2484 if (ecs
->sal
.line
== 0)
2486 /* We have no line number information. That means to stop
2487 stepping (does this always happen right after one instruction,
2488 when we do "s" in a function with no line numbers,
2489 or can this happen as a result of a return or longjmp?). */
2491 printf_unfiltered ("infrun: no line number info\n");
2493 print_stop_reason (END_STEPPING_RANGE
, 0);
2494 stop_stepping (ecs
);
2498 if ((stop_pc
== ecs
->sal
.pc
)
2499 && (ecs
->current_line
!= ecs
->sal
.line
2500 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2502 /* We are at the start of a different line. So stop. Note that
2503 we don't stop if we step into the middle of a different line.
2504 That is said to make things like for (;;) statements work
2507 printf_unfiltered ("infrun: stepped to a different line\n");
2509 print_stop_reason (END_STEPPING_RANGE
, 0);
2510 stop_stepping (ecs
);
2514 /* We aren't done stepping.
2516 Optimize by setting the stepping range to the line.
2517 (We might not be in the original line, but if we entered a
2518 new line in mid-statement, we continue stepping. This makes
2519 things like for(;;) statements work better.) */
2521 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2523 /* If this is the last line of the function, don't keep stepping
2524 (it would probably step us out of the function).
2525 This is particularly necessary for a one-line function,
2526 in which after skipping the prologue we better stop even though
2527 we will be in mid-line. */
2529 printf_unfiltered ("infrun: stepped to a different function\n");
2531 print_stop_reason (END_STEPPING_RANGE
, 0);
2532 stop_stepping (ecs
);
2535 step_range_start
= ecs
->sal
.pc
;
2536 step_range_end
= ecs
->sal
.end
;
2537 step_frame_id
= get_frame_id (get_current_frame ());
2538 ecs
->current_line
= ecs
->sal
.line
;
2539 ecs
->current_symtab
= ecs
->sal
.symtab
;
2541 /* In the case where we just stepped out of a function into the
2542 middle of a line of the caller, continue stepping, but
2543 step_frame_id must be modified to current frame */
2545 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2546 generous. It will trigger on things like a step into a frameless
2547 stackless leaf function. I think the logic should instead look
2548 at the unwound frame ID has that should give a more robust
2549 indication of what happened. */
2550 if (step
- ID
== current
- ID
)
2551 still stepping in same function
;
2552 else if (step
- ID
== unwind (current
- ID
))
2553 stepped into a function
;
2555 stepped out of a function
;
2556 /* Of course this assumes that the frame ID unwind code is robust
2557 and we're willing to introduce frame unwind logic into this
2558 function. Fortunately, those days are nearly upon us. */
2561 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2562 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2563 step_frame_id
= current_frame
;
2567 printf_unfiltered ("infrun: keep going\n");
2571 /* Are we in the middle of stepping? */
2574 currently_stepping (struct execution_control_state
*ecs
)
2576 return ((!ecs
->handling_longjmp
2577 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2579 || ecs
->stepping_through_solib_after_catch
2580 || bpstat_should_step ());
2583 /* Subroutine call with source code we should not step over. Do step
2584 to the first line of code in it. */
2587 step_into_function (struct execution_control_state
*ecs
)
2590 struct symtab_and_line sr_sal
;
2592 s
= find_pc_symtab (stop_pc
);
2593 if (s
&& s
->language
!= language_asm
)
2594 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2596 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2597 /* Use the step_resume_break to step until the end of the prologue,
2598 even if that involves jumps (as it seems to on the vax under
2600 /* If the prologue ends in the middle of a source line, continue to
2601 the end of that source line (if it is still within the function).
2602 Otherwise, just go to end of prologue. */
2604 && ecs
->sal
.pc
!= ecs
->stop_func_start
2605 && ecs
->sal
.end
< ecs
->stop_func_end
)
2606 ecs
->stop_func_start
= ecs
->sal
.end
;
2608 /* Architectures which require breakpoint adjustment might not be able
2609 to place a breakpoint at the computed address. If so, the test
2610 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2611 ecs->stop_func_start to an address at which a breakpoint may be
2612 legitimately placed.
2614 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2615 made, GDB will enter an infinite loop when stepping through
2616 optimized code consisting of VLIW instructions which contain
2617 subinstructions corresponding to different source lines. On
2618 FR-V, it's not permitted to place a breakpoint on any but the
2619 first subinstruction of a VLIW instruction. When a breakpoint is
2620 set, GDB will adjust the breakpoint address to the beginning of
2621 the VLIW instruction. Thus, we need to make the corresponding
2622 adjustment here when computing the stop address. */
2624 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2626 ecs
->stop_func_start
2627 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2628 ecs
->stop_func_start
);
2631 if (ecs
->stop_func_start
== stop_pc
)
2633 /* We are already there: stop now. */
2635 print_stop_reason (END_STEPPING_RANGE
, 0);
2636 stop_stepping (ecs
);
2641 /* Put the step-breakpoint there and go until there. */
2642 init_sal (&sr_sal
); /* initialize to zeroes */
2643 sr_sal
.pc
= ecs
->stop_func_start
;
2644 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2646 /* Do not specify what the fp should be when we stop since on
2647 some machines the prologue is where the new fp value is
2649 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2651 /* And make sure stepping stops right away then. */
2652 step_range_end
= step_range_start
;
2657 /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID.
2658 This is used to both functions and to skip over code. */
2661 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
2662 struct frame_id sr_id
)
2664 /* There should never be more than one step-resume breakpoint per
2665 thread, so we should never be setting a new
2666 step_resume_breakpoint when one is already active. */
2667 gdb_assert (step_resume_breakpoint
== NULL
);
2668 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
2670 if (breakpoints_inserted
)
2671 insert_breakpoints ();
2674 /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used
2675 to skip a function (next, skip-no-debug) or signal. It's assumed
2676 that the function/signal handler being skipped eventually returns
2677 to the breakpoint inserted at RETURN_FRAME.pc.
2679 For the skip-function case, the function may have been reached by
2680 either single stepping a call / return / signal-return instruction,
2681 or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs
2682 to the skip-function's caller.
2684 For the signals case, this is called with the interrupted
2685 function's frame. The signal handler, when it returns, will resume
2686 the interrupted function at RETURN_FRAME.pc. */
2689 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
2691 struct symtab_and_line sr_sal
;
2693 init_sal (&sr_sal
); /* initialize to zeros */
2695 sr_sal
.pc
= ADDR_BITS_REMOVE (get_frame_pc (return_frame
));
2696 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2698 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
2702 stop_stepping (struct execution_control_state
*ecs
)
2705 printf_unfiltered ("infrun: stop_stepping\n");
2707 /* Let callers know we don't want to wait for the inferior anymore. */
2708 ecs
->wait_some_more
= 0;
2711 /* This function handles various cases where we need to continue
2712 waiting for the inferior. */
2713 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2716 keep_going (struct execution_control_state
*ecs
)
2718 /* Save the pc before execution, to compare with pc after stop. */
2719 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2721 /* If we did not do break;, it means we should keep running the
2722 inferior and not return to debugger. */
2724 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2726 /* We took a signal (which we are supposed to pass through to
2727 the inferior, else we'd have done a break above) and we
2728 haven't yet gotten our trap. Simply continue. */
2729 resume (currently_stepping (ecs
), stop_signal
);
2733 /* Either the trap was not expected, but we are continuing
2734 anyway (the user asked that this signal be passed to the
2737 The signal was SIGTRAP, e.g. it was our signal, but we
2738 decided we should resume from it.
2740 We're going to run this baby now! */
2742 if (!breakpoints_inserted
&& !ecs
->another_trap
)
2744 breakpoints_failed
= insert_breakpoints ();
2745 if (breakpoints_failed
)
2747 stop_stepping (ecs
);
2750 breakpoints_inserted
= 1;
2753 trap_expected
= ecs
->another_trap
;
2755 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2756 specifies that such a signal should be delivered to the
2759 Typically, this would occure when a user is debugging a
2760 target monitor on a simulator: the target monitor sets a
2761 breakpoint; the simulator encounters this break-point and
2762 halts the simulation handing control to GDB; GDB, noteing
2763 that the break-point isn't valid, returns control back to the
2764 simulator; the simulator then delivers the hardware
2765 equivalent of a SIGNAL_TRAP to the program being debugged. */
2767 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2768 stop_signal
= TARGET_SIGNAL_0
;
2771 resume (currently_stepping (ecs
), stop_signal
);
2774 prepare_to_wait (ecs
);
2777 /* This function normally comes after a resume, before
2778 handle_inferior_event exits. It takes care of any last bits of
2779 housekeeping, and sets the all-important wait_some_more flag. */
2782 prepare_to_wait (struct execution_control_state
*ecs
)
2785 printf_unfiltered ("infrun: prepare_to_wait\n");
2786 if (ecs
->infwait_state
== infwait_normal_state
)
2788 overlay_cache_invalid
= 1;
2790 /* We have to invalidate the registers BEFORE calling
2791 target_wait because they can be loaded from the target while
2792 in target_wait. This makes remote debugging a bit more
2793 efficient for those targets that provide critical registers
2794 as part of their normal status mechanism. */
2796 registers_changed ();
2797 ecs
->waiton_ptid
= pid_to_ptid (-1);
2798 ecs
->wp
= &(ecs
->ws
);
2800 /* This is the old end of the while loop. Let everybody know we
2801 want to wait for the inferior some more and get called again
2803 ecs
->wait_some_more
= 1;
2806 /* Print why the inferior has stopped. We always print something when
2807 the inferior exits, or receives a signal. The rest of the cases are
2808 dealt with later on in normal_stop() and print_it_typical(). Ideally
2809 there should be a call to this function from handle_inferior_event()
2810 each time stop_stepping() is called.*/
2812 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2814 switch (stop_reason
)
2817 /* We don't deal with these cases from handle_inferior_event()
2820 case END_STEPPING_RANGE
:
2821 /* We are done with a step/next/si/ni command. */
2822 /* For now print nothing. */
2823 /* Print a message only if not in the middle of doing a "step n"
2824 operation for n > 1 */
2825 if (!step_multi
|| !stop_step
)
2826 if (ui_out_is_mi_like_p (uiout
))
2827 ui_out_field_string (uiout
, "reason", "end-stepping-range");
2829 case BREAKPOINT_HIT
:
2830 /* We found a breakpoint. */
2831 /* For now print nothing. */
2834 /* The inferior was terminated by a signal. */
2835 annotate_signalled ();
2836 if (ui_out_is_mi_like_p (uiout
))
2837 ui_out_field_string (uiout
, "reason", "exited-signalled");
2838 ui_out_text (uiout
, "\nProgram terminated with signal ");
2839 annotate_signal_name ();
2840 ui_out_field_string (uiout
, "signal-name",
2841 target_signal_to_name (stop_info
));
2842 annotate_signal_name_end ();
2843 ui_out_text (uiout
, ", ");
2844 annotate_signal_string ();
2845 ui_out_field_string (uiout
, "signal-meaning",
2846 target_signal_to_string (stop_info
));
2847 annotate_signal_string_end ();
2848 ui_out_text (uiout
, ".\n");
2849 ui_out_text (uiout
, "The program no longer exists.\n");
2852 /* The inferior program is finished. */
2853 annotate_exited (stop_info
);
2856 if (ui_out_is_mi_like_p (uiout
))
2857 ui_out_field_string (uiout
, "reason", "exited");
2858 ui_out_text (uiout
, "\nProgram exited with code ");
2859 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2860 (unsigned int) stop_info
);
2861 ui_out_text (uiout
, ".\n");
2865 if (ui_out_is_mi_like_p (uiout
))
2866 ui_out_field_string (uiout
, "reason", "exited-normally");
2867 ui_out_text (uiout
, "\nProgram exited normally.\n");
2870 case SIGNAL_RECEIVED
:
2871 /* Signal received. The signal table tells us to print about
2874 ui_out_text (uiout
, "\nProgram received signal ");
2875 annotate_signal_name ();
2876 if (ui_out_is_mi_like_p (uiout
))
2877 ui_out_field_string (uiout
, "reason", "signal-received");
2878 ui_out_field_string (uiout
, "signal-name",
2879 target_signal_to_name (stop_info
));
2880 annotate_signal_name_end ();
2881 ui_out_text (uiout
, ", ");
2882 annotate_signal_string ();
2883 ui_out_field_string (uiout
, "signal-meaning",
2884 target_signal_to_string (stop_info
));
2885 annotate_signal_string_end ();
2886 ui_out_text (uiout
, ".\n");
2889 internal_error (__FILE__
, __LINE__
,
2890 "print_stop_reason: unrecognized enum value");
2896 /* Here to return control to GDB when the inferior stops for real.
2897 Print appropriate messages, remove breakpoints, give terminal our modes.
2899 STOP_PRINT_FRAME nonzero means print the executing frame
2900 (pc, function, args, file, line number and line text).
2901 BREAKPOINTS_FAILED nonzero means stop was due to error
2902 attempting to insert breakpoints. */
2907 struct target_waitstatus last
;
2910 get_last_target_status (&last_ptid
, &last
);
2912 /* As with the notification of thread events, we want to delay
2913 notifying the user that we've switched thread context until
2914 the inferior actually stops.
2916 There's no point in saying anything if the inferior has exited.
2917 Note that SIGNALLED here means "exited with a signal", not
2918 "received a signal". */
2919 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
2920 && target_has_execution
2921 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
2922 && last
.kind
!= TARGET_WAITKIND_EXITED
)
2924 target_terminal_ours_for_output ();
2925 printf_filtered ("[Switching to %s]\n",
2926 target_pid_or_tid_to_str (inferior_ptid
));
2927 previous_inferior_ptid
= inferior_ptid
;
2930 /* NOTE drow/2004-01-17: Is this still necessary? */
2931 /* Make sure that the current_frame's pc is correct. This
2932 is a correction for setting up the frame info before doing
2933 DECR_PC_AFTER_BREAK */
2934 if (target_has_execution
)
2935 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2936 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2937 frame code to check for this and sort out any resultant mess.
2938 DECR_PC_AFTER_BREAK needs to just go away. */
2939 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2941 if (target_has_execution
&& breakpoints_inserted
)
2943 if (remove_breakpoints ())
2945 target_terminal_ours_for_output ();
2946 printf_filtered ("Cannot remove breakpoints because ");
2947 printf_filtered ("program is no longer writable.\n");
2948 printf_filtered ("It might be running in another process.\n");
2949 printf_filtered ("Further execution is probably impossible.\n");
2952 breakpoints_inserted
= 0;
2954 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2955 Delete any breakpoint that is to be deleted at the next stop. */
2957 breakpoint_auto_delete (stop_bpstat
);
2959 /* If an auto-display called a function and that got a signal,
2960 delete that auto-display to avoid an infinite recursion. */
2962 if (stopped_by_random_signal
)
2963 disable_current_display ();
2965 /* Don't print a message if in the middle of doing a "step n"
2966 operation for n > 1 */
2967 if (step_multi
&& stop_step
)
2970 target_terminal_ours ();
2972 /* Look up the hook_stop and run it (CLI internally handles problem
2973 of stop_command's pre-hook not existing). */
2975 catch_errors (hook_stop_stub
, stop_command
,
2976 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
2978 if (!target_has_stack
)
2984 /* Select innermost stack frame - i.e., current frame is frame 0,
2985 and current location is based on that.
2986 Don't do this on return from a stack dummy routine,
2987 or if the program has exited. */
2989 if (!stop_stack_dummy
)
2991 select_frame (get_current_frame ());
2993 /* Print current location without a level number, if
2994 we have changed functions or hit a breakpoint.
2995 Print source line if we have one.
2996 bpstat_print() contains the logic deciding in detail
2997 what to print, based on the event(s) that just occurred. */
2999 if (stop_print_frame
&& deprecated_selected_frame
)
3003 int do_frame_printing
= 1;
3005 bpstat_ret
= bpstat_print (stop_bpstat
);
3009 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3010 (or should) carry around the function and does (or
3011 should) use that when doing a frame comparison. */
3013 && frame_id_eq (step_frame_id
,
3014 get_frame_id (get_current_frame ()))
3015 && step_start_function
== find_pc_function (stop_pc
))
3016 source_flag
= SRC_LINE
; /* finished step, just print source line */
3018 source_flag
= SRC_AND_LOC
; /* print location and source line */
3020 case PRINT_SRC_AND_LOC
:
3021 source_flag
= SRC_AND_LOC
; /* print location and source line */
3023 case PRINT_SRC_ONLY
:
3024 source_flag
= SRC_LINE
;
3027 source_flag
= SRC_LINE
; /* something bogus */
3028 do_frame_printing
= 0;
3031 internal_error (__FILE__
, __LINE__
, "Unknown value.");
3033 /* For mi, have the same behavior every time we stop:
3034 print everything but the source line. */
3035 if (ui_out_is_mi_like_p (uiout
))
3036 source_flag
= LOC_AND_ADDRESS
;
3038 if (ui_out_is_mi_like_p (uiout
))
3039 ui_out_field_int (uiout
, "thread-id",
3040 pid_to_thread_id (inferior_ptid
));
3041 /* The behavior of this routine with respect to the source
3043 SRC_LINE: Print only source line
3044 LOCATION: Print only location
3045 SRC_AND_LOC: Print location and source line */
3046 if (do_frame_printing
)
3047 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3049 /* Display the auto-display expressions. */
3054 /* Save the function value return registers, if we care.
3055 We might be about to restore their previous contents. */
3056 if (proceed_to_finish
)
3057 /* NB: The copy goes through to the target picking up the value of
3058 all the registers. */
3059 regcache_cpy (stop_registers
, current_regcache
);
3061 if (stop_stack_dummy
)
3063 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3064 ends with a setting of the current frame, so we can use that
3066 frame_pop (get_current_frame ());
3067 /* Set stop_pc to what it was before we called the function.
3068 Can't rely on restore_inferior_status because that only gets
3069 called if we don't stop in the called function. */
3070 stop_pc
= read_pc ();
3071 select_frame (get_current_frame ());
3075 annotate_stopped ();
3076 observer_notify_normal_stop (stop_bpstat
);
3080 hook_stop_stub (void *cmd
)
3082 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3087 signal_stop_state (int signo
)
3089 return signal_stop
[signo
];
3093 signal_print_state (int signo
)
3095 return signal_print
[signo
];
3099 signal_pass_state (int signo
)
3101 return signal_program
[signo
];
3105 signal_stop_update (int signo
, int state
)
3107 int ret
= signal_stop
[signo
];
3108 signal_stop
[signo
] = state
;
3113 signal_print_update (int signo
, int state
)
3115 int ret
= signal_print
[signo
];
3116 signal_print
[signo
] = state
;
3121 signal_pass_update (int signo
, int state
)
3123 int ret
= signal_program
[signo
];
3124 signal_program
[signo
] = state
;
3129 sig_print_header (void)
3132 Signal Stop\tPrint\tPass to program\tDescription\n");
3136 sig_print_info (enum target_signal oursig
)
3138 char *name
= target_signal_to_name (oursig
);
3139 int name_padding
= 13 - strlen (name
);
3141 if (name_padding
<= 0)
3144 printf_filtered ("%s", name
);
3145 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3146 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3147 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3148 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3149 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3152 /* Specify how various signals in the inferior should be handled. */
3155 handle_command (char *args
, int from_tty
)
3158 int digits
, wordlen
;
3159 int sigfirst
, signum
, siglast
;
3160 enum target_signal oursig
;
3163 unsigned char *sigs
;
3164 struct cleanup
*old_chain
;
3168 error_no_arg ("signal to handle");
3171 /* Allocate and zero an array of flags for which signals to handle. */
3173 nsigs
= (int) TARGET_SIGNAL_LAST
;
3174 sigs
= (unsigned char *) alloca (nsigs
);
3175 memset (sigs
, 0, nsigs
);
3177 /* Break the command line up into args. */
3179 argv
= buildargv (args
);
3184 old_chain
= make_cleanup_freeargv (argv
);
3186 /* Walk through the args, looking for signal oursigs, signal names, and
3187 actions. Signal numbers and signal names may be interspersed with
3188 actions, with the actions being performed for all signals cumulatively
3189 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3191 while (*argv
!= NULL
)
3193 wordlen
= strlen (*argv
);
3194 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3198 sigfirst
= siglast
= -1;
3200 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3202 /* Apply action to all signals except those used by the
3203 debugger. Silently skip those. */
3206 siglast
= nsigs
- 1;
3208 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3210 SET_SIGS (nsigs
, sigs
, signal_stop
);
3211 SET_SIGS (nsigs
, sigs
, signal_print
);
3213 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3215 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3217 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3219 SET_SIGS (nsigs
, sigs
, signal_print
);
3221 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3223 SET_SIGS (nsigs
, sigs
, signal_program
);
3225 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3227 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3229 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3231 SET_SIGS (nsigs
, sigs
, signal_program
);
3233 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3235 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3236 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3238 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3240 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3242 else if (digits
> 0)
3244 /* It is numeric. The numeric signal refers to our own
3245 internal signal numbering from target.h, not to host/target
3246 signal number. This is a feature; users really should be
3247 using symbolic names anyway, and the common ones like
3248 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3250 sigfirst
= siglast
= (int)
3251 target_signal_from_command (atoi (*argv
));
3252 if ((*argv
)[digits
] == '-')
3255 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3257 if (sigfirst
> siglast
)
3259 /* Bet he didn't figure we'd think of this case... */
3267 oursig
= target_signal_from_name (*argv
);
3268 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3270 sigfirst
= siglast
= (int) oursig
;
3274 /* Not a number and not a recognized flag word => complain. */
3275 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3279 /* If any signal numbers or symbol names were found, set flags for
3280 which signals to apply actions to. */
3282 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3284 switch ((enum target_signal
) signum
)
3286 case TARGET_SIGNAL_TRAP
:
3287 case TARGET_SIGNAL_INT
:
3288 if (!allsigs
&& !sigs
[signum
])
3290 if (query ("%s is used by the debugger.\n\
3291 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3297 printf_unfiltered ("Not confirmed, unchanged.\n");
3298 gdb_flush (gdb_stdout
);
3302 case TARGET_SIGNAL_0
:
3303 case TARGET_SIGNAL_DEFAULT
:
3304 case TARGET_SIGNAL_UNKNOWN
:
3305 /* Make sure that "all" doesn't print these. */
3316 target_notice_signals (inferior_ptid
);
3320 /* Show the results. */
3321 sig_print_header ();
3322 for (signum
= 0; signum
< nsigs
; signum
++)
3326 sig_print_info (signum
);
3331 do_cleanups (old_chain
);
3335 xdb_handle_command (char *args
, int from_tty
)
3338 struct cleanup
*old_chain
;
3340 /* Break the command line up into args. */
3342 argv
= buildargv (args
);
3347 old_chain
= make_cleanup_freeargv (argv
);
3348 if (argv
[1] != (char *) NULL
)
3353 bufLen
= strlen (argv
[0]) + 20;
3354 argBuf
= (char *) xmalloc (bufLen
);
3358 enum target_signal oursig
;
3360 oursig
= target_signal_from_name (argv
[0]);
3361 memset (argBuf
, 0, bufLen
);
3362 if (strcmp (argv
[1], "Q") == 0)
3363 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3366 if (strcmp (argv
[1], "s") == 0)
3368 if (!signal_stop
[oursig
])
3369 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3371 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3373 else if (strcmp (argv
[1], "i") == 0)
3375 if (!signal_program
[oursig
])
3376 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3378 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3380 else if (strcmp (argv
[1], "r") == 0)
3382 if (!signal_print
[oursig
])
3383 sprintf (argBuf
, "%s %s", argv
[0], "print");
3385 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3391 handle_command (argBuf
, from_tty
);
3393 printf_filtered ("Invalid signal handling flag.\n");
3398 do_cleanups (old_chain
);
3401 /* Print current contents of the tables set by the handle command.
3402 It is possible we should just be printing signals actually used
3403 by the current target (but for things to work right when switching
3404 targets, all signals should be in the signal tables). */
3407 signals_info (char *signum_exp
, int from_tty
)
3409 enum target_signal oursig
;
3410 sig_print_header ();
3414 /* First see if this is a symbol name. */
3415 oursig
= target_signal_from_name (signum_exp
);
3416 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3418 /* No, try numeric. */
3420 target_signal_from_command (parse_and_eval_long (signum_exp
));
3422 sig_print_info (oursig
);
3426 printf_filtered ("\n");
3427 /* These ugly casts brought to you by the native VAX compiler. */
3428 for (oursig
= TARGET_SIGNAL_FIRST
;
3429 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3430 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3434 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3435 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3436 sig_print_info (oursig
);
3439 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3442 struct inferior_status
3444 enum target_signal stop_signal
;
3448 int stop_stack_dummy
;
3449 int stopped_by_random_signal
;
3451 CORE_ADDR step_range_start
;
3452 CORE_ADDR step_range_end
;
3453 struct frame_id step_frame_id
;
3454 enum step_over_calls_kind step_over_calls
;
3455 CORE_ADDR step_resume_break_address
;
3456 int stop_after_trap
;
3458 struct regcache
*stop_registers
;
3460 /* These are here because if call_function_by_hand has written some
3461 registers and then decides to call error(), we better not have changed
3463 struct regcache
*registers
;
3465 /* A frame unique identifier. */
3466 struct frame_id selected_frame_id
;
3468 int breakpoint_proceeded
;
3469 int restore_stack_info
;
3470 int proceed_to_finish
;
3474 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3477 int size
= register_size (current_gdbarch
, regno
);
3478 void *buf
= alloca (size
);
3479 store_signed_integer (buf
, size
, val
);
3480 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3483 /* Save all of the information associated with the inferior<==>gdb
3484 connection. INF_STATUS is a pointer to a "struct inferior_status"
3485 (defined in inferior.h). */
3487 struct inferior_status
*
3488 save_inferior_status (int restore_stack_info
)
3490 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3492 inf_status
->stop_signal
= stop_signal
;
3493 inf_status
->stop_pc
= stop_pc
;
3494 inf_status
->stop_step
= stop_step
;
3495 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3496 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3497 inf_status
->trap_expected
= trap_expected
;
3498 inf_status
->step_range_start
= step_range_start
;
3499 inf_status
->step_range_end
= step_range_end
;
3500 inf_status
->step_frame_id
= step_frame_id
;
3501 inf_status
->step_over_calls
= step_over_calls
;
3502 inf_status
->stop_after_trap
= stop_after_trap
;
3503 inf_status
->stop_soon
= stop_soon
;
3504 /* Save original bpstat chain here; replace it with copy of chain.
3505 If caller's caller is walking the chain, they'll be happier if we
3506 hand them back the original chain when restore_inferior_status is
3508 inf_status
->stop_bpstat
= stop_bpstat
;
3509 stop_bpstat
= bpstat_copy (stop_bpstat
);
3510 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3511 inf_status
->restore_stack_info
= restore_stack_info
;
3512 inf_status
->proceed_to_finish
= proceed_to_finish
;
3514 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3516 inf_status
->registers
= regcache_dup (current_regcache
);
3518 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3523 restore_selected_frame (void *args
)
3525 struct frame_id
*fid
= (struct frame_id
*) args
;
3526 struct frame_info
*frame
;
3528 frame
= frame_find_by_id (*fid
);
3530 /* If inf_status->selected_frame_id is NULL, there was no previously
3534 warning ("Unable to restore previously selected frame.\n");
3538 select_frame (frame
);
3544 restore_inferior_status (struct inferior_status
*inf_status
)
3546 stop_signal
= inf_status
->stop_signal
;
3547 stop_pc
= inf_status
->stop_pc
;
3548 stop_step
= inf_status
->stop_step
;
3549 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3550 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3551 trap_expected
= inf_status
->trap_expected
;
3552 step_range_start
= inf_status
->step_range_start
;
3553 step_range_end
= inf_status
->step_range_end
;
3554 step_frame_id
= inf_status
->step_frame_id
;
3555 step_over_calls
= inf_status
->step_over_calls
;
3556 stop_after_trap
= inf_status
->stop_after_trap
;
3557 stop_soon
= inf_status
->stop_soon
;
3558 bpstat_clear (&stop_bpstat
);
3559 stop_bpstat
= inf_status
->stop_bpstat
;
3560 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3561 proceed_to_finish
= inf_status
->proceed_to_finish
;
3563 /* FIXME: Is the restore of stop_registers always needed. */
3564 regcache_xfree (stop_registers
);
3565 stop_registers
= inf_status
->stop_registers
;
3567 /* The inferior can be gone if the user types "print exit(0)"
3568 (and perhaps other times). */
3569 if (target_has_execution
)
3570 /* NB: The register write goes through to the target. */
3571 regcache_cpy (current_regcache
, inf_status
->registers
);
3572 regcache_xfree (inf_status
->registers
);
3574 /* FIXME: If we are being called after stopping in a function which
3575 is called from gdb, we should not be trying to restore the
3576 selected frame; it just prints a spurious error message (The
3577 message is useful, however, in detecting bugs in gdb (like if gdb
3578 clobbers the stack)). In fact, should we be restoring the
3579 inferior status at all in that case? . */
3581 if (target_has_stack
&& inf_status
->restore_stack_info
)
3583 /* The point of catch_errors is that if the stack is clobbered,
3584 walking the stack might encounter a garbage pointer and
3585 error() trying to dereference it. */
3587 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3588 "Unable to restore previously selected frame:\n",
3589 RETURN_MASK_ERROR
) == 0)
3590 /* Error in restoring the selected frame. Select the innermost
3592 select_frame (get_current_frame ());
3600 do_restore_inferior_status_cleanup (void *sts
)
3602 restore_inferior_status (sts
);
3606 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3608 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3612 discard_inferior_status (struct inferior_status
*inf_status
)
3614 /* See save_inferior_status for info on stop_bpstat. */
3615 bpstat_clear (&inf_status
->stop_bpstat
);
3616 regcache_xfree (inf_status
->registers
);
3617 regcache_xfree (inf_status
->stop_registers
);
3622 inferior_has_forked (int pid
, int *child_pid
)
3624 struct target_waitstatus last
;
3627 get_last_target_status (&last_ptid
, &last
);
3629 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3632 if (ptid_get_pid (last_ptid
) != pid
)
3635 *child_pid
= last
.value
.related_pid
;
3640 inferior_has_vforked (int pid
, int *child_pid
)
3642 struct target_waitstatus last
;
3645 get_last_target_status (&last_ptid
, &last
);
3647 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3650 if (ptid_get_pid (last_ptid
) != pid
)
3653 *child_pid
= last
.value
.related_pid
;
3658 inferior_has_execd (int pid
, char **execd_pathname
)
3660 struct target_waitstatus last
;
3663 get_last_target_status (&last_ptid
, &last
);
3665 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3668 if (ptid_get_pid (last_ptid
) != pid
)
3671 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3675 /* Oft used ptids */
3677 ptid_t minus_one_ptid
;
3679 /* Create a ptid given the necessary PID, LWP, and TID components. */
3682 ptid_build (int pid
, long lwp
, long tid
)
3692 /* Create a ptid from just a pid. */
3695 pid_to_ptid (int pid
)
3697 return ptid_build (pid
, 0, 0);
3700 /* Fetch the pid (process id) component from a ptid. */
3703 ptid_get_pid (ptid_t ptid
)
3708 /* Fetch the lwp (lightweight process) component from a ptid. */
3711 ptid_get_lwp (ptid_t ptid
)
3716 /* Fetch the tid (thread id) component from a ptid. */
3719 ptid_get_tid (ptid_t ptid
)
3724 /* ptid_equal() is used to test equality of two ptids. */
3727 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3729 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3730 && ptid1
.tid
== ptid2
.tid
);
3733 /* restore_inferior_ptid() will be used by the cleanup machinery
3734 to restore the inferior_ptid value saved in a call to
3735 save_inferior_ptid(). */
3738 restore_inferior_ptid (void *arg
)
3740 ptid_t
*saved_ptid_ptr
= arg
;
3741 inferior_ptid
= *saved_ptid_ptr
;
3745 /* Save the value of inferior_ptid so that it may be restored by a
3746 later call to do_cleanups(). Returns the struct cleanup pointer
3747 needed for later doing the cleanup. */
3750 save_inferior_ptid (void)
3752 ptid_t
*saved_ptid_ptr
;
3754 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3755 *saved_ptid_ptr
= inferior_ptid
;
3756 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3763 stop_registers
= regcache_xmalloc (current_gdbarch
);
3767 _initialize_infrun (void)
3771 struct cmd_list_element
*c
;
3773 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers
);
3774 deprecated_register_gdbarch_swap (NULL
, 0, build_infrun
);
3776 add_info ("signals", signals_info
,
3777 "What debugger does when program gets various signals.\n\
3778 Specify a signal as argument to print info on that signal only.");
3779 add_info_alias ("handle", "signals", 0);
3781 add_com ("handle", class_run
, handle_command
,
3782 concat ("Specify how to handle a signal.\n\
3783 Args are signals and actions to apply to those signals.\n\
3784 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3785 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3786 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3787 The special arg \"all\" is recognized to mean all signals except those\n\
3788 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3789 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3790 Stop means reenter debugger if this signal happens (implies print).\n\
3791 Print means print a message if this signal happens.\n\
3792 Pass means let program see this signal; otherwise program doesn't know.\n\
3793 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3794 Pass and Stop may be combined.", NULL
));
3797 add_com ("lz", class_info
, signals_info
,
3798 "What debugger does when program gets various signals.\n\
3799 Specify a signal as argument to print info on that signal only.");
3800 add_com ("z", class_run
, xdb_handle_command
,
3801 concat ("Specify how to handle a signal.\n\
3802 Args are signals and actions to apply to those signals.\n\
3803 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3804 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3805 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3806 The special arg \"all\" is recognized to mean all signals except those\n\
3807 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3808 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3809 nopass), \"Q\" (noprint)\n\
3810 Stop means reenter debugger if this signal happens (implies print).\n\
3811 Print means print a message if this signal happens.\n\
3812 Pass means let program see this signal; otherwise program doesn't know.\n\
3813 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3814 Pass and Stop may be combined.", NULL
));
3819 add_cmd ("stop", class_obscure
, not_just_help_class_command
, "There is no `stop' command, but you can set a hook on `stop'.\n\
3820 This allows you to set a list of commands to be run each time execution\n\
3821 of the program stops.", &cmdlist
);
3823 add_set_cmd ("infrun", class_maintenance
, var_zinteger
,
3824 &debug_infrun
, "Set inferior debugging.\n\
3825 When non-zero, inferior specific debugging is enabled.", &setdebuglist
);
3827 numsigs
= (int) TARGET_SIGNAL_LAST
;
3828 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3829 signal_print
= (unsigned char *)
3830 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3831 signal_program
= (unsigned char *)
3832 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3833 for (i
= 0; i
< numsigs
; i
++)
3836 signal_print
[i
] = 1;
3837 signal_program
[i
] = 1;
3840 /* Signals caused by debugger's own actions
3841 should not be given to the program afterwards. */
3842 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3843 signal_program
[TARGET_SIGNAL_INT
] = 0;
3845 /* Signals that are not errors should not normally enter the debugger. */
3846 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3847 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3848 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3849 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3850 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3851 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3852 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3853 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3854 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3855 signal_print
[TARGET_SIGNAL_IO
] = 0;
3856 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3857 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3858 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3859 signal_print
[TARGET_SIGNAL_URG
] = 0;
3860 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
3861 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
3863 /* These signals are used internally by user-level thread
3864 implementations. (See signal(5) on Solaris.) Like the above
3865 signals, a healthy program receives and handles them as part of
3866 its normal operation. */
3867 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
3868 signal_print
[TARGET_SIGNAL_LWP
] = 0;
3869 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
3870 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
3871 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
3872 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
3875 deprecated_add_show_from_set
3876 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
3877 (char *) &stop_on_solib_events
,
3878 "Set stopping for shared library events.\n\
3879 If nonzero, gdb will give control to the user when the dynamic linker\n\
3880 notifies gdb of shared library events. The most common event of interest\n\
3881 to the user would be loading/unloading of a new library.\n", &setlist
), &showlist
);
3884 c
= add_set_enum_cmd ("follow-fork-mode",
3886 follow_fork_mode_kind_names
, &follow_fork_mode_string
,
3887 "Set debugger response to a program call of fork \
3889 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3890 parent - the original process is debugged after a fork\n\
3891 child - the new process is debugged after a fork\n\
3892 The unfollowed process will continue to run.\n\
3893 By default, the debugger will follow the parent process.", &setlist
);
3894 deprecated_add_show_from_set (c
, &showlist
);
3896 c
= add_set_enum_cmd ("scheduler-locking", class_run
, scheduler_enums
, /* array of string names */
3897 &scheduler_mode
, /* current mode */
3898 "Set mode for locking scheduler during execution.\n\
3899 off == no locking (threads may preempt at any time)\n\
3900 on == full locking (no thread except the current thread may run)\n\
3901 step == scheduler locked during every single-step operation.\n\
3902 In this mode, no other thread may run during a step command.\n\
3903 Other threads may run while stepping over a function call ('next').", &setlist
);
3905 set_cmd_sfunc (c
, set_schedlock_func
); /* traps on target vector */
3906 deprecated_add_show_from_set (c
, &showlist
);
3908 c
= add_set_cmd ("step-mode", class_run
,
3909 var_boolean
, (char *) &step_stop_if_no_debug
,
3910 "Set mode of the step operation. When set, doing a step over a\n\
3911 function without debug line information will stop at the first\n\
3912 instruction of that function. Otherwise, the function is skipped and\n\
3913 the step command stops at a different source line.", &setlist
);
3914 deprecated_add_show_from_set (c
, &showlist
);
3916 /* ptid initializations */
3917 null_ptid
= ptid_build (0, 0, 0);
3918 minus_one_ptid
= ptid_build (-1, 0, 0);
3919 inferior_ptid
= null_ptid
;
3920 target_last_wait_ptid
= minus_one_ptid
;