1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
6 Free 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., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
26 #include "gdb_string.h"
31 #include "exceptions.h"
32 #include "breakpoint.h"
36 #include "cli/cli-script.h"
38 #include "gdbthread.h"
51 #include "gdb_assert.h"
52 #include "mi/mi-common.h"
54 /* Prototypes for local functions */
56 static void signals_info (char *, int);
58 static void handle_command (char *, int);
60 static void sig_print_info (enum target_signal
);
62 static void sig_print_header (void);
64 static void resume_cleanups (void *);
66 static int hook_stop_stub (void *);
68 static int restore_selected_frame (void *);
70 static void build_infrun (void);
72 static int follow_fork (void);
74 static void set_schedlock_func (char *args
, int from_tty
,
75 struct cmd_list_element
*c
);
77 struct execution_control_state
;
79 static int currently_stepping (struct execution_control_state
*ecs
);
81 static void xdb_handle_command (char *args
, int from_tty
);
83 static int prepare_to_proceed (void);
85 void _initialize_infrun (void);
87 int inferior_ignoring_startup_exec_events
= 0;
88 int inferior_ignoring_leading_exec_events
= 0;
90 /* When set, stop the 'step' command if we enter a function which has
91 no line number information. The normal behavior is that we step
92 over such function. */
93 int step_stop_if_no_debug
= 0;
95 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
96 struct cmd_list_element
*c
, const char *value
)
98 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
101 /* In asynchronous mode, but simulating synchronous execution. */
103 int sync_execution
= 0;
105 /* wait_for_inferior and normal_stop use this to notify the user
106 when the inferior stopped in a different thread than it had been
109 static ptid_t previous_inferior_ptid
;
111 /* This is true for configurations that may follow through execl() and
112 similar functions. At present this is only true for HP-UX native. */
114 #ifndef MAY_FOLLOW_EXEC
115 #define MAY_FOLLOW_EXEC (0)
118 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
120 static int debug_infrun
= 0;
122 show_debug_infrun (struct ui_file
*file
, int from_tty
,
123 struct cmd_list_element
*c
, const char *value
)
125 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
128 /* If the program uses ELF-style shared libraries, then calls to
129 functions in shared libraries go through stubs, which live in a
130 table called the PLT (Procedure Linkage Table). The first time the
131 function is called, the stub sends control to the dynamic linker,
132 which looks up the function's real address, patches the stub so
133 that future calls will go directly to the function, and then passes
134 control to the function.
136 If we are stepping at the source level, we don't want to see any of
137 this --- we just want to skip over the stub and the dynamic linker.
138 The simple approach is to single-step until control leaves the
141 However, on some systems (e.g., Red Hat's 5.2 distribution) the
142 dynamic linker calls functions in the shared C library, so you
143 can't tell from the PC alone whether the dynamic linker is still
144 running. In this case, we use a step-resume breakpoint to get us
145 past the dynamic linker, as if we were using "next" to step over a
148 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
149 linker code or not. Normally, this means we single-step. However,
150 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
151 address where we can place a step-resume breakpoint to get past the
152 linker's symbol resolution function.
154 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
155 pretty portable way, by comparing the PC against the address ranges
156 of the dynamic linker's sections.
158 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
159 it depends on internal details of the dynamic linker. It's usually
160 not too hard to figure out where to put a breakpoint, but it
161 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
162 sanity checking. If it can't figure things out, returning zero and
163 getting the (possibly confusing) stepping behavior is better than
164 signalling an error, which will obscure the change in the
167 /* This function returns TRUE if pc is the address of an instruction
168 that lies within the dynamic linker (such as the event hook, or the
171 This function must be used only when a dynamic linker event has
172 been caught, and the inferior is being stepped out of the hook, or
173 undefined results are guaranteed. */
175 #ifndef SOLIB_IN_DYNAMIC_LINKER
176 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
179 /* We can't step off a permanent breakpoint in the ordinary way, because we
180 can't remove it. Instead, we have to advance the PC to the next
181 instruction. This macro should expand to a pointer to a function that
182 does that, or zero if we have no such function. If we don't have a
183 definition for it, we have to report an error. */
184 #ifndef SKIP_PERMANENT_BREAKPOINT
185 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
187 default_skip_permanent_breakpoint (void)
190 The program is stopped at a permanent breakpoint, but GDB does not know\n\
191 how to step past a permanent breakpoint on this architecture. Try using\n\
192 a command like `return' or `jump' to continue execution."));
197 /* Convert the #defines into values. This is temporary until wfi control
198 flow is completely sorted out. */
200 #ifndef CANNOT_STEP_HW_WATCHPOINTS
201 #define CANNOT_STEP_HW_WATCHPOINTS 0
203 #undef CANNOT_STEP_HW_WATCHPOINTS
204 #define CANNOT_STEP_HW_WATCHPOINTS 1
207 /* Tables of how to react to signals; the user sets them. */
209 static unsigned char *signal_stop
;
210 static unsigned char *signal_print
;
211 static unsigned char *signal_program
;
213 #define SET_SIGS(nsigs,sigs,flags) \
215 int signum = (nsigs); \
216 while (signum-- > 0) \
217 if ((sigs)[signum]) \
218 (flags)[signum] = 1; \
221 #define UNSET_SIGS(nsigs,sigs,flags) \
223 int signum = (nsigs); \
224 while (signum-- > 0) \
225 if ((sigs)[signum]) \
226 (flags)[signum] = 0; \
229 /* Value to pass to target_resume() to cause all threads to resume */
231 #define RESUME_ALL (pid_to_ptid (-1))
233 /* Command list pointer for the "stop" placeholder. */
235 static struct cmd_list_element
*stop_command
;
237 /* Nonzero if breakpoints are now inserted in the inferior. */
239 static int breakpoints_inserted
;
241 /* Function inferior was in as of last step command. */
243 static struct symbol
*step_start_function
;
245 /* Nonzero if we are expecting a trace trap and should proceed from it. */
247 static int trap_expected
;
249 /* Nonzero if we want to give control to the user when we're notified
250 of shared library events by the dynamic linker. */
251 static int stop_on_solib_events
;
253 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
254 struct cmd_list_element
*c
, const char *value
)
256 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
260 /* Nonzero means expecting a trace trap
261 and should stop the inferior and return silently when it happens. */
265 /* Nonzero means expecting a trap and caller will handle it themselves.
266 It is used after attach, due to attaching to a process;
267 when running in the shell before the child program has been exec'd;
268 and when running some kinds of remote stuff (FIXME?). */
270 enum stop_kind stop_soon
;
272 /* Nonzero if proceed is being used for a "finish" command or a similar
273 situation when stop_registers should be saved. */
275 int proceed_to_finish
;
277 /* Save register contents here when about to pop a stack dummy frame,
278 if-and-only-if proceed_to_finish is set.
279 Thus this contains the return value from the called function (assuming
280 values are returned in a register). */
282 struct regcache
*stop_registers
;
284 /* Nonzero after stop if current stack frame should be printed. */
286 static int stop_print_frame
;
288 static struct breakpoint
*step_resume_breakpoint
= NULL
;
290 /* This is a cached copy of the pid/waitstatus of the last event
291 returned by target_wait()/deprecated_target_wait_hook(). This
292 information is returned by get_last_target_status(). */
293 static ptid_t target_last_wait_ptid
;
294 static struct target_waitstatus target_last_waitstatus
;
296 /* This is used to remember when a fork, vfork or exec event
297 was caught by a catchpoint, and thus the event is to be
298 followed at the next resume of the inferior, and not
302 enum target_waitkind kind
;
309 char *execd_pathname
;
313 static const char follow_fork_mode_child
[] = "child";
314 static const char follow_fork_mode_parent
[] = "parent";
316 static const char *follow_fork_mode_kind_names
[] = {
317 follow_fork_mode_child
,
318 follow_fork_mode_parent
,
322 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
324 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
325 struct cmd_list_element
*c
, const char *value
)
327 fprintf_filtered (file
, _("\
328 Debugger response to a program call of fork or vfork is \"%s\".\n"),
336 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
338 return target_follow_fork (follow_child
);
342 follow_inferior_reset_breakpoints (void)
344 /* Was there a step_resume breakpoint? (There was if the user
345 did a "next" at the fork() call.) If so, explicitly reset its
348 step_resumes are a form of bp that are made to be per-thread.
349 Since we created the step_resume bp when the parent process
350 was being debugged, and now are switching to the child process,
351 from the breakpoint package's viewpoint, that's a switch of
352 "threads". We must update the bp's notion of which thread
353 it is for, or it'll be ignored when it triggers. */
355 if (step_resume_breakpoint
)
356 breakpoint_re_set_thread (step_resume_breakpoint
);
358 /* Reinsert all breakpoints in the child. The user may have set
359 breakpoints after catching the fork, in which case those
360 were never set in the child, but only in the parent. This makes
361 sure the inserted breakpoints match the breakpoint list. */
363 breakpoint_re_set ();
364 insert_breakpoints ();
367 /* EXECD_PATHNAME is assumed to be non-NULL. */
370 follow_exec (int pid
, char *execd_pathname
)
373 struct target_ops
*tgt
;
375 if (!may_follow_exec
)
378 /* This is an exec event that we actually wish to pay attention to.
379 Refresh our symbol table to the newly exec'd program, remove any
382 If there are breakpoints, they aren't really inserted now,
383 since the exec() transformed our inferior into a fresh set
386 We want to preserve symbolic breakpoints on the list, since
387 we have hopes that they can be reset after the new a.out's
388 symbol table is read.
390 However, any "raw" breakpoints must be removed from the list
391 (e.g., the solib bp's), since their address is probably invalid
394 And, we DON'T want to call delete_breakpoints() here, since
395 that may write the bp's "shadow contents" (the instruction
396 value that was overwritten witha TRAP instruction). Since
397 we now have a new a.out, those shadow contents aren't valid. */
398 update_breakpoints_after_exec ();
400 /* If there was one, it's gone now. We cannot truly step-to-next
401 statement through an exec(). */
402 step_resume_breakpoint
= NULL
;
403 step_range_start
= 0;
406 /* What is this a.out's name? */
407 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
409 /* We've followed the inferior through an exec. Therefore, the
410 inferior has essentially been killed & reborn. */
412 /* First collect the run target in effect. */
413 tgt
= find_run_target ();
414 /* If we can't find one, things are in a very strange state... */
416 error (_("Could find run target to save before following exec"));
418 gdb_flush (gdb_stdout
);
419 target_mourn_inferior ();
420 inferior_ptid
= pid_to_ptid (saved_pid
);
421 /* Because mourn_inferior resets inferior_ptid. */
424 /* That a.out is now the one to use. */
425 exec_file_attach (execd_pathname
, 0);
427 /* And also is where symbols can be found. */
428 symbol_file_add_main (execd_pathname
, 0);
430 /* Reset the shared library package. This ensures that we get
431 a shlib event when the child reaches "_start", at which point
432 the dld will have had a chance to initialize the child. */
433 #if defined(SOLIB_RESTART)
436 #ifdef SOLIB_CREATE_INFERIOR_HOOK
437 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
439 solib_create_inferior_hook ();
442 /* Reinsert all breakpoints. (Those which were symbolic have
443 been reset to the proper address in the new a.out, thanks
444 to symbol_file_command...) */
445 insert_breakpoints ();
447 /* The next resume of this inferior should bring it to the shlib
448 startup breakpoints. (If the user had also set bp's on
449 "main" from the old (parent) process, then they'll auto-
450 matically get reset there in the new process.) */
453 /* Non-zero if we just simulating a single-step. This is needed
454 because we cannot remove the breakpoints in the inferior process
455 until after the `wait' in `wait_for_inferior'. */
456 static int singlestep_breakpoints_inserted_p
= 0;
458 /* The thread we inserted single-step breakpoints for. */
459 static ptid_t singlestep_ptid
;
461 /* PC when we started this single-step. */
462 static CORE_ADDR singlestep_pc
;
464 /* If another thread hit the singlestep breakpoint, we save the original
465 thread here so that we can resume single-stepping it later. */
466 static ptid_t saved_singlestep_ptid
;
467 static int stepping_past_singlestep_breakpoint
;
470 /* Things to clean up if we QUIT out of resume (). */
472 resume_cleanups (void *ignore
)
477 static const char schedlock_off
[] = "off";
478 static const char schedlock_on
[] = "on";
479 static const char schedlock_step
[] = "step";
480 static const char *scheduler_enums
[] = {
486 static const char *scheduler_mode
= schedlock_off
;
488 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
489 struct cmd_list_element
*c
, const char *value
)
491 fprintf_filtered (file
, _("\
492 Mode for locking scheduler during execution is \"%s\".\n"),
497 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
499 if (!target_can_lock_scheduler
)
501 scheduler_mode
= schedlock_off
;
502 error (_("Target '%s' cannot support this command."), target_shortname
);
507 /* Resume the inferior, but allow a QUIT. This is useful if the user
508 wants to interrupt some lengthy single-stepping operation
509 (for child processes, the SIGINT goes to the inferior, and so
510 we get a SIGINT random_signal, but for remote debugging and perhaps
511 other targets, that's not true).
513 STEP nonzero if we should step (zero to continue instead).
514 SIG is the signal to give the inferior (zero for none). */
516 resume (int step
, enum target_signal sig
)
518 int should_resume
= 1;
519 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
523 fprintf_unfiltered (gdb_stdlog
, "infrun: resume (step=%d, signal=%d)\n",
526 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
529 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
530 over an instruction that causes a page fault without triggering
531 a hardware watchpoint. The kernel properly notices that it shouldn't
532 stop, because the hardware watchpoint is not triggered, but it forgets
533 the step request and continues the program normally.
534 Work around the problem by removing hardware watchpoints if a step is
535 requested, GDB will check for a hardware watchpoint trigger after the
537 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
538 remove_hw_watchpoints ();
541 /* Normally, by the time we reach `resume', the breakpoints are either
542 removed or inserted, as appropriate. The exception is if we're sitting
543 at a permanent breakpoint; we need to step over it, but permanent
544 breakpoints can't be removed. So we have to test for it here. */
545 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
546 SKIP_PERMANENT_BREAKPOINT ();
548 if (SOFTWARE_SINGLE_STEP_P () && step
)
550 /* Do it the hard way, w/temp breakpoints */
551 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
552 /* ...and don't ask hardware to do it. */
554 /* and do not pull these breakpoints until after a `wait' in
555 `wait_for_inferior' */
556 singlestep_breakpoints_inserted_p
= 1;
557 singlestep_ptid
= inferior_ptid
;
558 singlestep_pc
= read_pc ();
561 /* If there were any forks/vforks/execs that were caught and are
562 now to be followed, then do so. */
563 switch (pending_follow
.kind
)
565 case TARGET_WAITKIND_FORKED
:
566 case TARGET_WAITKIND_VFORKED
:
567 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
572 case TARGET_WAITKIND_EXECD
:
573 /* follow_exec is called as soon as the exec event is seen. */
574 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
581 /* Install inferior's terminal modes. */
582 target_terminal_inferior ();
588 resume_ptid
= RESUME_ALL
; /* Default */
590 if ((step
|| singlestep_breakpoints_inserted_p
)
591 && (stepping_past_singlestep_breakpoint
592 || (!breakpoints_inserted
&& breakpoint_here_p (read_pc ()))))
594 /* Stepping past a breakpoint without inserting breakpoints.
595 Make sure only the current thread gets to step, so that
596 other threads don't sneak past breakpoints while they are
599 resume_ptid
= inferior_ptid
;
602 if ((scheduler_mode
== schedlock_on
)
603 || (scheduler_mode
== schedlock_step
604 && (step
|| singlestep_breakpoints_inserted_p
)))
606 /* User-settable 'scheduler' mode requires solo thread resume. */
607 resume_ptid
= inferior_ptid
;
610 if (CANNOT_STEP_BREAKPOINT
)
612 /* Most targets can step a breakpoint instruction, thus
613 executing it normally. But if this one cannot, just
614 continue and we will hit it anyway. */
615 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
618 target_resume (resume_ptid
, step
, sig
);
621 discard_cleanups (old_cleanups
);
625 /* Clear out all variables saying what to do when inferior is continued.
626 First do this, then set the ones you want, then call `proceed'. */
629 clear_proceed_status (void)
632 step_range_start
= 0;
634 step_frame_id
= null_frame_id
;
635 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
637 stop_soon
= NO_STOP_QUIETLY
;
638 proceed_to_finish
= 0;
639 breakpoint_proceeded
= 1; /* We're about to proceed... */
641 /* Discard any remaining commands or status from previous stop. */
642 bpstat_clear (&stop_bpstat
);
645 /* This should be suitable for any targets that support threads. */
648 prepare_to_proceed (void)
651 struct target_waitstatus wait_status
;
653 /* Get the last target status returned by target_wait(). */
654 get_last_target_status (&wait_ptid
, &wait_status
);
656 /* Make sure we were stopped either at a breakpoint, or because
658 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
659 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
660 && wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
665 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
666 && !ptid_equal (inferior_ptid
, wait_ptid
))
668 /* Switched over from WAIT_PID. */
669 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
671 if (wait_pc
!= read_pc ())
673 /* Switch back to WAIT_PID thread. */
674 inferior_ptid
= wait_ptid
;
676 /* FIXME: This stuff came from switch_to_thread() in
677 thread.c (which should probably be a public function). */
678 reinit_frame_cache ();
679 registers_changed ();
683 /* We return 1 to indicate that there is a breakpoint here,
684 so we need to step over it before continuing to avoid
685 hitting it straight away. */
686 if (breakpoint_here_p (wait_pc
))
694 /* Record the pc of the program the last time it stopped. This is
695 just used internally by wait_for_inferior, but need to be preserved
696 over calls to it and cleared when the inferior is started. */
697 static CORE_ADDR prev_pc
;
699 /* Basic routine for continuing the program in various fashions.
701 ADDR is the address to resume at, or -1 for resume where stopped.
702 SIGGNAL is the signal to give it, or 0 for none,
703 or -1 for act according to how it stopped.
704 STEP is nonzero if should trap after one instruction.
705 -1 means return after that and print nothing.
706 You should probably set various step_... variables
707 before calling here, if you are stepping.
709 You should call clear_proceed_status before calling proceed. */
712 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
717 step_start_function
= find_pc_function (read_pc ());
721 if (addr
== (CORE_ADDR
) -1)
723 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
724 /* There is a breakpoint at the address we will resume at,
725 step one instruction before inserting breakpoints so that
726 we do not stop right away (and report a second hit at this
729 else if (gdbarch_single_step_through_delay_p (current_gdbarch
)
730 && gdbarch_single_step_through_delay (current_gdbarch
,
731 get_current_frame ()))
732 /* We stepped onto an instruction that needs to be stepped
733 again before re-inserting the breakpoint, do so. */
742 fprintf_unfiltered (gdb_stdlog
,
743 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
744 paddr_nz (addr
), siggnal
, step
);
746 /* In a multi-threaded task we may select another thread
747 and then continue or step.
749 But if the old thread was stopped at a breakpoint, it
750 will immediately cause another breakpoint stop without
751 any execution (i.e. it will report a breakpoint hit
752 incorrectly). So we must step over it first.
754 prepare_to_proceed checks the current thread against the thread
755 that reported the most recent event. If a step-over is required
756 it returns TRUE and sets the current thread to the old thread. */
757 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
761 /* We will get a trace trap after one instruction.
762 Continue it automatically and insert breakpoints then. */
766 insert_breakpoints ();
767 /* If we get here there was no call to error() in
768 insert breakpoints -- so they were inserted. */
769 breakpoints_inserted
= 1;
772 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
773 stop_signal
= siggnal
;
774 /* If this signal should not be seen by program,
775 give it zero. Used for debugging signals. */
776 else if (!signal_program
[stop_signal
])
777 stop_signal
= TARGET_SIGNAL_0
;
779 annotate_starting ();
781 /* Make sure that output from GDB appears before output from the
783 gdb_flush (gdb_stdout
);
785 /* Refresh prev_pc value just prior to resuming. This used to be
786 done in stop_stepping, however, setting prev_pc there did not handle
787 scenarios such as inferior function calls or returning from
788 a function via the return command. In those cases, the prev_pc
789 value was not set properly for subsequent commands. The prev_pc value
790 is used to initialize the starting line number in the ecs. With an
791 invalid value, the gdb next command ends up stopping at the position
792 represented by the next line table entry past our start position.
793 On platforms that generate one line table entry per line, this
794 is not a problem. However, on the ia64, the compiler generates
795 extraneous line table entries that do not increase the line number.
796 When we issue the gdb next command on the ia64 after an inferior call
797 or a return command, we often end up a few instructions forward, still
798 within the original line we started.
800 An attempt was made to have init_execution_control_state () refresh
801 the prev_pc value before calculating the line number. This approach
802 did not work because on platforms that use ptrace, the pc register
803 cannot be read unless the inferior is stopped. At that point, we
804 are not guaranteed the inferior is stopped and so the read_pc ()
805 call can fail. Setting the prev_pc value here ensures the value is
806 updated correctly when the inferior is stopped. */
807 prev_pc
= read_pc ();
809 /* Resume inferior. */
810 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
812 /* Wait for it to stop (if not standalone)
813 and in any case decode why it stopped, and act accordingly. */
814 /* Do this only if we are not using the event loop, or if the target
815 does not support asynchronous execution. */
816 if (!target_can_async_p ())
818 wait_for_inferior ();
824 /* Start remote-debugging of a machine over a serial link. */
827 start_remote (int from_tty
)
830 init_wait_for_inferior ();
831 stop_soon
= STOP_QUIETLY
;
834 /* Always go on waiting for the target, regardless of the mode. */
835 /* FIXME: cagney/1999-09-23: At present it isn't possible to
836 indicate to wait_for_inferior that a target should timeout if
837 nothing is returned (instead of just blocking). Because of this,
838 targets expecting an immediate response need to, internally, set
839 things up so that the target_wait() is forced to eventually
841 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
842 differentiate to its caller what the state of the target is after
843 the initial open has been performed. Here we're assuming that
844 the target has stopped. It should be possible to eventually have
845 target_open() return to the caller an indication that the target
846 is currently running and GDB state should be set to the same as
848 wait_for_inferior ();
850 /* Now that the inferior has stopped, do any bookkeeping like
851 loading shared libraries. We want to do this before normal_stop,
852 so that the displayed frame is up to date. */
853 post_create_inferior (¤t_target
, from_tty
);
858 /* Initialize static vars when a new inferior begins. */
861 init_wait_for_inferior (void)
863 /* These are meaningless until the first time through wait_for_inferior. */
866 breakpoints_inserted
= 0;
867 breakpoint_init_inferior (inf_starting
);
869 /* Don't confuse first call to proceed(). */
870 stop_signal
= TARGET_SIGNAL_0
;
872 /* The first resume is not following a fork/vfork/exec. */
873 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
875 clear_proceed_status ();
877 stepping_past_singlestep_breakpoint
= 0;
880 /* This enum encodes possible reasons for doing a target_wait, so that
881 wfi can call target_wait in one place. (Ultimately the call will be
882 moved out of the infinite loop entirely.) */
886 infwait_normal_state
,
887 infwait_thread_hop_state
,
888 infwait_nonstep_watch_state
891 /* Why did the inferior stop? Used to print the appropriate messages
892 to the interface from within handle_inferior_event(). */
893 enum inferior_stop_reason
895 /* Step, next, nexti, stepi finished. */
897 /* Inferior terminated by signal. */
899 /* Inferior exited. */
901 /* Inferior received signal, and user asked to be notified. */
905 /* This structure contains what used to be local variables in
906 wait_for_inferior. Probably many of them can return to being
907 locals in handle_inferior_event. */
909 struct execution_control_state
911 struct target_waitstatus ws
;
912 struct target_waitstatus
*wp
;
915 CORE_ADDR stop_func_start
;
916 CORE_ADDR stop_func_end
;
917 char *stop_func_name
;
918 struct symtab_and_line sal
;
920 struct symtab
*current_symtab
;
921 int handling_longjmp
; /* FIXME */
923 ptid_t saved_inferior_ptid
;
924 int step_after_step_resume_breakpoint
;
925 int stepping_through_solib_after_catch
;
926 bpstat stepping_through_solib_catchpoints
;
927 int new_thread_event
;
928 struct target_waitstatus tmpstatus
;
929 enum infwait_states infwait_state
;
934 void init_execution_control_state (struct execution_control_state
*ecs
);
936 void handle_inferior_event (struct execution_control_state
*ecs
);
938 static void step_into_function (struct execution_control_state
*ecs
);
939 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
940 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
941 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
942 struct frame_id sr_id
);
943 static void stop_stepping (struct execution_control_state
*ecs
);
944 static void prepare_to_wait (struct execution_control_state
*ecs
);
945 static void keep_going (struct execution_control_state
*ecs
);
946 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
949 /* Wait for control to return from inferior to debugger.
950 If inferior gets a signal, we may decide to start it up again
951 instead of returning. That is why there is a loop in this function.
952 When this function actually returns it means the inferior
953 should be left stopped and GDB should read more commands. */
956 wait_for_inferior (void)
958 struct cleanup
*old_cleanups
;
959 struct execution_control_state ecss
;
960 struct execution_control_state
*ecs
;
963 fprintf_unfiltered (gdb_stdlog
, "infrun: wait_for_inferior\n");
965 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
966 &step_resume_breakpoint
);
968 /* wfi still stays in a loop, so it's OK just to take the address of
969 a local to get the ecs pointer. */
972 /* Fill in with reasonable starting values. */
973 init_execution_control_state (ecs
);
975 /* We'll update this if & when we switch to a new thread. */
976 previous_inferior_ptid
= inferior_ptid
;
978 overlay_cache_invalid
= 1;
980 /* We have to invalidate the registers BEFORE calling target_wait
981 because they can be loaded from the target while in target_wait.
982 This makes remote debugging a bit more efficient for those
983 targets that provide critical registers as part of their normal
986 registers_changed ();
990 if (deprecated_target_wait_hook
)
991 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
993 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
995 /* Now figure out what to do with the result of the result. */
996 handle_inferior_event (ecs
);
998 if (!ecs
->wait_some_more
)
1001 do_cleanups (old_cleanups
);
1004 /* Asynchronous version of wait_for_inferior. It is called by the
1005 event loop whenever a change of state is detected on the file
1006 descriptor corresponding to the target. It can be called more than
1007 once to complete a single execution command. In such cases we need
1008 to keep the state in a global variable ASYNC_ECSS. If it is the
1009 last time that this function is called for a single execution
1010 command, then report to the user that the inferior has stopped, and
1011 do the necessary cleanups. */
1013 struct execution_control_state async_ecss
;
1014 struct execution_control_state
*async_ecs
;
1017 fetch_inferior_event (void *client_data
)
1019 static struct cleanup
*old_cleanups
;
1021 async_ecs
= &async_ecss
;
1023 if (!async_ecs
->wait_some_more
)
1025 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1026 &step_resume_breakpoint
);
1028 /* Fill in with reasonable starting values. */
1029 init_execution_control_state (async_ecs
);
1031 /* We'll update this if & when we switch to a new thread. */
1032 previous_inferior_ptid
= inferior_ptid
;
1034 overlay_cache_invalid
= 1;
1036 /* We have to invalidate the registers BEFORE calling target_wait
1037 because they can be loaded from the target while in target_wait.
1038 This makes remote debugging a bit more efficient for those
1039 targets that provide critical registers as part of their normal
1040 status mechanism. */
1042 registers_changed ();
1045 if (deprecated_target_wait_hook
)
1047 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1049 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1051 /* Now figure out what to do with the result of the result. */
1052 handle_inferior_event (async_ecs
);
1054 if (!async_ecs
->wait_some_more
)
1056 /* Do only the cleanups that have been added by this
1057 function. Let the continuations for the commands do the rest,
1058 if there are any. */
1059 do_exec_cleanups (old_cleanups
);
1061 if (step_multi
&& stop_step
)
1062 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1064 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1068 /* Prepare an execution control state for looping through a
1069 wait_for_inferior-type loop. */
1072 init_execution_control_state (struct execution_control_state
*ecs
)
1074 ecs
->another_trap
= 0;
1075 ecs
->random_signal
= 0;
1076 ecs
->step_after_step_resume_breakpoint
= 0;
1077 ecs
->handling_longjmp
= 0; /* FIXME */
1078 ecs
->stepping_through_solib_after_catch
= 0;
1079 ecs
->stepping_through_solib_catchpoints
= NULL
;
1080 ecs
->sal
= find_pc_line (prev_pc
, 0);
1081 ecs
->current_line
= ecs
->sal
.line
;
1082 ecs
->current_symtab
= ecs
->sal
.symtab
;
1083 ecs
->infwait_state
= infwait_normal_state
;
1084 ecs
->waiton_ptid
= pid_to_ptid (-1);
1085 ecs
->wp
= &(ecs
->ws
);
1088 /* Return the cached copy of the last pid/waitstatus returned by
1089 target_wait()/deprecated_target_wait_hook(). The data is actually
1090 cached by handle_inferior_event(), which gets called immediately
1091 after target_wait()/deprecated_target_wait_hook(). */
1094 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1096 *ptidp
= target_last_wait_ptid
;
1097 *status
= target_last_waitstatus
;
1101 nullify_last_target_wait_ptid (void)
1103 target_last_wait_ptid
= minus_one_ptid
;
1106 /* Switch thread contexts, maintaining "infrun state". */
1109 context_switch (struct execution_control_state
*ecs
)
1111 /* Caution: it may happen that the new thread (or the old one!)
1112 is not in the thread list. In this case we must not attempt
1113 to "switch context", or we run the risk that our context may
1114 be lost. This may happen as a result of the target module
1115 mishandling thread creation. */
1119 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
1120 target_pid_to_str (inferior_ptid
));
1121 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
1122 target_pid_to_str (ecs
->ptid
));
1125 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1126 { /* Perform infrun state context switch: */
1127 /* Save infrun state for the old thread. */
1128 save_infrun_state (inferior_ptid
, prev_pc
,
1129 trap_expected
, step_resume_breakpoint
,
1131 step_range_end
, &step_frame_id
,
1132 ecs
->handling_longjmp
, ecs
->another_trap
,
1133 ecs
->stepping_through_solib_after_catch
,
1134 ecs
->stepping_through_solib_catchpoints
,
1135 ecs
->current_line
, ecs
->current_symtab
);
1137 /* Load infrun state for the new thread. */
1138 load_infrun_state (ecs
->ptid
, &prev_pc
,
1139 &trap_expected
, &step_resume_breakpoint
,
1141 &step_range_end
, &step_frame_id
,
1142 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1143 &ecs
->stepping_through_solib_after_catch
,
1144 &ecs
->stepping_through_solib_catchpoints
,
1145 &ecs
->current_line
, &ecs
->current_symtab
);
1147 inferior_ptid
= ecs
->ptid
;
1148 reinit_frame_cache ();
1152 adjust_pc_after_break (struct execution_control_state
*ecs
)
1154 CORE_ADDR breakpoint_pc
;
1156 /* If this target does not decrement the PC after breakpoints, then
1157 we have nothing to do. */
1158 if (DECR_PC_AFTER_BREAK
== 0)
1161 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1162 we aren't, just return.
1164 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1165 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1166 by software breakpoints should be handled through the normal breakpoint
1169 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1170 different signals (SIGILL or SIGEMT for instance), but it is less
1171 clear where the PC is pointing afterwards. It may not match
1172 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1173 these signals at breakpoints (the code has been in GDB since at least
1174 1992) so I can not guess how to handle them here.
1176 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1177 would have the PC after hitting a watchpoint affected by
1178 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1179 in GDB history, and it seems unlikely to be correct, so
1180 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1182 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1185 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1188 /* Find the location where (if we've hit a breakpoint) the
1189 breakpoint would be. */
1190 breakpoint_pc
= read_pc_pid (ecs
->ptid
) - DECR_PC_AFTER_BREAK
;
1192 if (SOFTWARE_SINGLE_STEP_P ())
1194 /* When using software single-step, a SIGTRAP can only indicate
1195 an inserted breakpoint. This actually makes things
1197 if (singlestep_breakpoints_inserted_p
)
1198 /* When software single stepping, the instruction at [prev_pc]
1199 is never a breakpoint, but the instruction following
1200 [prev_pc] (in program execution order) always is. Assume
1201 that following instruction was reached and hence a software
1202 breakpoint was hit. */
1203 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1204 else if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1205 /* The inferior was free running (i.e., no single-step
1206 breakpoints inserted) and it hit a software breakpoint. */
1207 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1211 /* When using hardware single-step, a SIGTRAP is reported for
1212 both a completed single-step and a software breakpoint. Need
1213 to differentiate between the two as the latter needs
1214 adjusting but the former does not.
1216 When the thread to be examined does not match the current thread
1217 context we can't use currently_stepping, so assume no
1218 single-stepping in this case. */
1219 if (ptid_equal (ecs
->ptid
, inferior_ptid
) && currently_stepping (ecs
))
1221 if (prev_pc
== breakpoint_pc
1222 && software_breakpoint_inserted_here_p (breakpoint_pc
))
1223 /* Hardware single-stepped a software breakpoint (as
1224 occures when the inferior is resumed with PC pointing
1225 at not-yet-hit software breakpoint). Since the
1226 breakpoint really is executed, the inferior needs to be
1227 backed up to the breakpoint address. */
1228 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1232 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1233 /* The inferior was free running (i.e., no hardware
1234 single-step and no possibility of a false SIGTRAP) and
1235 hit a software breakpoint. */
1236 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1241 /* Given an execution control state that has been freshly filled in
1242 by an event from the inferior, figure out what it means and take
1243 appropriate action. */
1245 int stepped_after_stopped_by_watchpoint
;
1248 handle_inferior_event (struct execution_control_state
*ecs
)
1250 /* NOTE: bje/2005-05-02: If you're looking at this code and thinking
1251 that the variable stepped_after_stopped_by_watchpoint isn't used,
1252 then you're wrong! See remote.c:remote_stopped_data_address. */
1254 int sw_single_step_trap_p
= 0;
1255 int stopped_by_watchpoint
= -1; /* Mark as unknown. */
1257 /* Cache the last pid/waitstatus. */
1258 target_last_wait_ptid
= ecs
->ptid
;
1259 target_last_waitstatus
= *ecs
->wp
;
1261 adjust_pc_after_break (ecs
);
1263 switch (ecs
->infwait_state
)
1265 case infwait_thread_hop_state
:
1267 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1268 /* Cancel the waiton_ptid. */
1269 ecs
->waiton_ptid
= pid_to_ptid (-1);
1272 case infwait_normal_state
:
1274 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
1275 stepped_after_stopped_by_watchpoint
= 0;
1278 case infwait_nonstep_watch_state
:
1280 fprintf_unfiltered (gdb_stdlog
,
1281 "infrun: infwait_nonstep_watch_state\n");
1282 insert_breakpoints ();
1284 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1285 handle things like signals arriving and other things happening
1286 in combination correctly? */
1287 stepped_after_stopped_by_watchpoint
= 1;
1291 internal_error (__FILE__
, __LINE__
, _("bad switch"));
1293 ecs
->infwait_state
= infwait_normal_state
;
1295 reinit_frame_cache ();
1297 /* If it's a new process, add it to the thread database */
1299 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1300 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1301 && !in_thread_list (ecs
->ptid
));
1303 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1304 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1306 add_thread (ecs
->ptid
);
1308 ui_out_text (uiout
, "[New ");
1309 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1310 ui_out_text (uiout
, "]\n");
1313 switch (ecs
->ws
.kind
)
1315 case TARGET_WAITKIND_LOADED
:
1317 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
1318 /* Ignore gracefully during startup of the inferior, as it
1319 might be the shell which has just loaded some objects,
1320 otherwise add the symbols for the newly loaded objects. */
1322 if (stop_soon
== NO_STOP_QUIETLY
)
1324 /* Remove breakpoints, SOLIB_ADD might adjust
1325 breakpoint addresses via breakpoint_re_set. */
1326 if (breakpoints_inserted
)
1327 remove_breakpoints ();
1329 /* Check for any newly added shared libraries if we're
1330 supposed to be adding them automatically. Switch
1331 terminal for any messages produced by
1332 breakpoint_re_set. */
1333 target_terminal_ours_for_output ();
1334 /* NOTE: cagney/2003-11-25: Make certain that the target
1335 stack's section table is kept up-to-date. Architectures,
1336 (e.g., PPC64), use the section table to perform
1337 operations such as address => section name and hence
1338 require the table to contain all sections (including
1339 those found in shared libraries). */
1340 /* NOTE: cagney/2003-11-25: Pass current_target and not
1341 exec_ops to SOLIB_ADD. This is because current GDB is
1342 only tooled to propagate section_table changes out from
1343 the "current_target" (see target_resize_to_sections), and
1344 not up from the exec stratum. This, of course, isn't
1345 right. "infrun.c" should only interact with the
1346 exec/process stratum, instead relying on the target stack
1347 to propagate relevant changes (stop, section table
1348 changed, ...) up to other layers. */
1349 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1350 target_terminal_inferior ();
1352 /* Reinsert breakpoints and continue. */
1353 if (breakpoints_inserted
)
1354 insert_breakpoints ();
1357 resume (0, TARGET_SIGNAL_0
);
1358 prepare_to_wait (ecs
);
1361 case TARGET_WAITKIND_SPURIOUS
:
1363 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1364 resume (0, TARGET_SIGNAL_0
);
1365 prepare_to_wait (ecs
);
1368 case TARGET_WAITKIND_EXITED
:
1370 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
1371 target_terminal_ours (); /* Must do this before mourn anyway */
1372 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1374 /* Record the exit code in the convenience variable $_exitcode, so
1375 that the user can inspect this again later. */
1376 set_internalvar (lookup_internalvar ("_exitcode"),
1377 value_from_longest (builtin_type_int
,
1378 (LONGEST
) ecs
->ws
.value
.integer
));
1379 gdb_flush (gdb_stdout
);
1380 target_mourn_inferior ();
1381 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1382 stop_print_frame
= 0;
1383 stop_stepping (ecs
);
1386 case TARGET_WAITKIND_SIGNALLED
:
1388 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1389 stop_print_frame
= 0;
1390 stop_signal
= ecs
->ws
.value
.sig
;
1391 target_terminal_ours (); /* Must do this before mourn anyway */
1393 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1394 reach here unless the inferior is dead. However, for years
1395 target_kill() was called here, which hints that fatal signals aren't
1396 really fatal on some systems. If that's true, then some changes
1398 target_mourn_inferior ();
1400 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1401 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1402 stop_stepping (ecs
);
1405 /* The following are the only cases in which we keep going;
1406 the above cases end in a continue or goto. */
1407 case TARGET_WAITKIND_FORKED
:
1408 case TARGET_WAITKIND_VFORKED
:
1410 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
1411 stop_signal
= TARGET_SIGNAL_TRAP
;
1412 pending_follow
.kind
= ecs
->ws
.kind
;
1414 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1415 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1417 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1419 context_switch (ecs
);
1420 reinit_frame_cache ();
1423 stop_pc
= read_pc ();
1425 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1427 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1429 /* If no catchpoint triggered for this, then keep going. */
1430 if (ecs
->random_signal
)
1432 stop_signal
= TARGET_SIGNAL_0
;
1436 goto process_event_stop_test
;
1438 case TARGET_WAITKIND_EXECD
:
1440 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
1441 stop_signal
= TARGET_SIGNAL_TRAP
;
1443 /* NOTE drow/2002-12-05: This code should be pushed down into the
1444 target_wait function. Until then following vfork on HP/UX 10.20
1445 is probably broken by this. Of course, it's broken anyway. */
1446 /* Is this a target which reports multiple exec events per actual
1447 call to exec()? (HP-UX using ptrace does, for example.) If so,
1448 ignore all but the last one. Just resume the exec'r, and wait
1449 for the next exec event. */
1450 if (inferior_ignoring_leading_exec_events
)
1452 inferior_ignoring_leading_exec_events
--;
1453 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1454 prepare_to_wait (ecs
);
1457 inferior_ignoring_leading_exec_events
=
1458 target_reported_exec_events_per_exec_call () - 1;
1460 pending_follow
.execd_pathname
=
1461 savestring (ecs
->ws
.value
.execd_pathname
,
1462 strlen (ecs
->ws
.value
.execd_pathname
));
1464 /* This causes the eventpoints and symbol table to be reset. Must
1465 do this now, before trying to determine whether to stop. */
1466 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1467 xfree (pending_follow
.execd_pathname
);
1469 stop_pc
= read_pc_pid (ecs
->ptid
);
1470 ecs
->saved_inferior_ptid
= inferior_ptid
;
1471 inferior_ptid
= ecs
->ptid
;
1473 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1475 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1476 inferior_ptid
= ecs
->saved_inferior_ptid
;
1478 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1480 context_switch (ecs
);
1481 reinit_frame_cache ();
1484 /* If no catchpoint triggered for this, then keep going. */
1485 if (ecs
->random_signal
)
1487 stop_signal
= TARGET_SIGNAL_0
;
1491 goto process_event_stop_test
;
1493 /* Be careful not to try to gather much state about a thread
1494 that's in a syscall. It's frequently a losing proposition. */
1495 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1497 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1498 resume (0, TARGET_SIGNAL_0
);
1499 prepare_to_wait (ecs
);
1502 /* Before examining the threads further, step this thread to
1503 get it entirely out of the syscall. (We get notice of the
1504 event when the thread is just on the verge of exiting a
1505 syscall. Stepping one instruction seems to get it back
1507 case TARGET_WAITKIND_SYSCALL_RETURN
:
1509 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1510 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1511 prepare_to_wait (ecs
);
1514 case TARGET_WAITKIND_STOPPED
:
1516 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
1517 stop_signal
= ecs
->ws
.value
.sig
;
1520 /* We had an event in the inferior, but we are not interested
1521 in handling it at this level. The lower layers have already
1522 done what needs to be done, if anything.
1524 One of the possible circumstances for this is when the
1525 inferior produces output for the console. The inferior has
1526 not stopped, and we are ignoring the event. Another possible
1527 circumstance is any event which the lower level knows will be
1528 reported multiple times without an intervening resume. */
1529 case TARGET_WAITKIND_IGNORE
:
1531 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
1532 prepare_to_wait (ecs
);
1536 /* We may want to consider not doing a resume here in order to give
1537 the user a chance to play with the new thread. It might be good
1538 to make that a user-settable option. */
1540 /* At this point, all threads are stopped (happens automatically in
1541 either the OS or the native code). Therefore we need to continue
1542 all threads in order to make progress. */
1543 if (ecs
->new_thread_event
)
1545 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1546 prepare_to_wait (ecs
);
1550 stop_pc
= read_pc_pid (ecs
->ptid
);
1553 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc
));
1555 if (stepping_past_singlestep_breakpoint
)
1557 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1558 && singlestep_breakpoints_inserted_p
);
1559 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1560 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1562 stepping_past_singlestep_breakpoint
= 0;
1564 /* We've either finished single-stepping past the single-step
1565 breakpoint, or stopped for some other reason. It would be nice if
1566 we could tell, but we can't reliably. */
1567 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1570 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
1571 /* Pull the single step breakpoints out of the target. */
1572 SOFTWARE_SINGLE_STEP (0, 0);
1573 singlestep_breakpoints_inserted_p
= 0;
1575 ecs
->random_signal
= 0;
1577 ecs
->ptid
= saved_singlestep_ptid
;
1578 context_switch (ecs
);
1579 if (deprecated_context_hook
)
1580 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1582 resume (1, TARGET_SIGNAL_0
);
1583 prepare_to_wait (ecs
);
1588 stepping_past_singlestep_breakpoint
= 0;
1590 /* See if a thread hit a thread-specific breakpoint that was meant for
1591 another thread. If so, then step that thread past the breakpoint,
1594 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1596 int thread_hop_needed
= 0;
1598 /* Check if a regular breakpoint has been hit before checking
1599 for a potential single step breakpoint. Otherwise, GDB will
1600 not see this breakpoint hit when stepping onto breakpoints. */
1601 if (breakpoints_inserted
&& breakpoint_here_p (stop_pc
))
1603 ecs
->random_signal
= 0;
1604 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1605 thread_hop_needed
= 1;
1607 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1609 /* We have not context switched yet, so this should be true
1610 no matter which thread hit the singlestep breakpoint. */
1611 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
1613 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
1615 target_pid_to_str (ecs
->ptid
));
1617 ecs
->random_signal
= 0;
1618 /* The call to in_thread_list is necessary because PTIDs sometimes
1619 change when we go from single-threaded to multi-threaded. If
1620 the singlestep_ptid is still in the list, assume that it is
1621 really different from ecs->ptid. */
1622 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1623 && in_thread_list (singlestep_ptid
))
1625 /* If the PC of the thread we were trying to single-step
1626 has changed, discard this event (which we were going
1627 to ignore anyway), and pretend we saw that thread
1628 trap. This prevents us continuously moving the
1629 single-step breakpoint forward, one instruction at a
1630 time. If the PC has changed, then the thread we were
1631 trying to single-step has trapped or been signalled,
1632 but the event has not been reported to GDB yet.
1634 There might be some cases where this loses signal
1635 information, if a signal has arrived at exactly the
1636 same time that the PC changed, but this is the best
1637 we can do with the information available. Perhaps we
1638 should arrange to report all events for all threads
1639 when they stop, or to re-poll the remote looking for
1640 this particular thread (i.e. temporarily enable
1642 if (read_pc_pid (singlestep_ptid
) != singlestep_pc
)
1645 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
1646 " but expected thread advanced also\n");
1648 /* The current context still belongs to
1649 singlestep_ptid. Don't swap here, since that's
1650 the context we want to use. Just fudge our
1651 state and continue. */
1652 ecs
->ptid
= singlestep_ptid
;
1653 stop_pc
= read_pc_pid (ecs
->ptid
);
1658 fprintf_unfiltered (gdb_stdlog
,
1659 "infrun: unexpected thread\n");
1661 thread_hop_needed
= 1;
1662 stepping_past_singlestep_breakpoint
= 1;
1663 saved_singlestep_ptid
= singlestep_ptid
;
1668 if (thread_hop_needed
)
1673 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
1675 /* Saw a breakpoint, but it was hit by the wrong thread.
1678 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1680 /* Pull the single step breakpoints out of the target. */
1681 SOFTWARE_SINGLE_STEP (0, 0);
1682 singlestep_breakpoints_inserted_p
= 0;
1685 remove_status
= remove_breakpoints ();
1686 /* Did we fail to remove breakpoints? If so, try
1687 to set the PC past the bp. (There's at least
1688 one situation in which we can fail to remove
1689 the bp's: On HP-UX's that use ttrace, we can't
1690 change the address space of a vforking child
1691 process until the child exits (well, okay, not
1692 then either :-) or execs. */
1693 if (remove_status
!= 0)
1695 /* FIXME! This is obviously non-portable! */
1696 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1697 /* We need to restart all the threads now,
1698 * unles we're running in scheduler-locked mode.
1699 * Use currently_stepping to determine whether to
1702 /* FIXME MVS: is there any reason not to call resume()? */
1703 if (scheduler_mode
== schedlock_on
)
1704 target_resume (ecs
->ptid
,
1705 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1707 target_resume (RESUME_ALL
,
1708 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1709 prepare_to_wait (ecs
);
1714 breakpoints_inserted
= 0;
1715 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1716 context_switch (ecs
);
1717 ecs
->waiton_ptid
= ecs
->ptid
;
1718 ecs
->wp
= &(ecs
->ws
);
1719 ecs
->another_trap
= 1;
1721 ecs
->infwait_state
= infwait_thread_hop_state
;
1723 registers_changed ();
1727 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1729 sw_single_step_trap_p
= 1;
1730 ecs
->random_signal
= 0;
1734 ecs
->random_signal
= 1;
1736 /* See if something interesting happened to the non-current thread. If
1737 so, then switch to that thread. */
1738 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1741 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
1743 context_switch (ecs
);
1745 if (deprecated_context_hook
)
1746 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1749 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1751 /* Pull the single step breakpoints out of the target. */
1752 SOFTWARE_SINGLE_STEP (0, 0);
1753 singlestep_breakpoints_inserted_p
= 0;
1756 /* It may not be necessary to disable the watchpoint to stop over
1757 it. For example, the PA can (with some kernel cooperation)
1758 single step over a watchpoint without disabling the watchpoint. */
1759 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1762 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1764 prepare_to_wait (ecs
);
1768 /* It is far more common to need to disable a watchpoint to step
1769 the inferior over it. FIXME. What else might a debug
1770 register or page protection watchpoint scheme need here? */
1771 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1773 /* At this point, we are stopped at an instruction which has
1774 attempted to write to a piece of memory under control of
1775 a watchpoint. The instruction hasn't actually executed
1776 yet. If we were to evaluate the watchpoint expression
1777 now, we would get the old value, and therefore no change
1778 would seem to have occurred.
1780 In order to make watchpoints work `right', we really need
1781 to complete the memory write, and then evaluate the
1782 watchpoint expression. The following code does that by
1783 removing the watchpoint (actually, all watchpoints and
1784 breakpoints), single-stepping the target, re-inserting
1785 watchpoints, and then falling through to let normal
1786 single-step processing handle proceed. Since this
1787 includes evaluating watchpoints, things will come to a
1788 stop in the correct manner. */
1791 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1792 remove_breakpoints ();
1793 registers_changed ();
1794 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1796 ecs
->waiton_ptid
= ecs
->ptid
;
1797 ecs
->wp
= &(ecs
->ws
);
1798 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1799 prepare_to_wait (ecs
);
1803 /* It may be possible to simply continue after a watchpoint. */
1804 if (HAVE_CONTINUABLE_WATCHPOINT
)
1805 stopped_by_watchpoint
= STOPPED_BY_WATCHPOINT (ecs
->ws
);
1807 ecs
->stop_func_start
= 0;
1808 ecs
->stop_func_end
= 0;
1809 ecs
->stop_func_name
= 0;
1810 /* Don't care about return value; stop_func_start and stop_func_name
1811 will both be 0 if it doesn't work. */
1812 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1813 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1814 ecs
->stop_func_start
+= DEPRECATED_FUNCTION_START_OFFSET
;
1815 ecs
->another_trap
= 0;
1816 bpstat_clear (&stop_bpstat
);
1818 stop_stack_dummy
= 0;
1819 stop_print_frame
= 1;
1820 ecs
->random_signal
= 0;
1821 stopped_by_random_signal
= 0;
1823 if (stop_signal
== TARGET_SIGNAL_TRAP
1825 && gdbarch_single_step_through_delay_p (current_gdbarch
)
1826 && currently_stepping (ecs
))
1828 /* We're trying to step of a breakpoint. Turns out that we're
1829 also on an instruction that needs to be stepped multiple
1830 times before it's been fully executing. E.g., architectures
1831 with a delay slot. It needs to be stepped twice, once for
1832 the instruction and once for the delay slot. */
1833 int step_through_delay
1834 = gdbarch_single_step_through_delay (current_gdbarch
,
1835 get_current_frame ());
1836 if (debug_infrun
&& step_through_delay
)
1837 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
1838 if (step_range_end
== 0 && step_through_delay
)
1840 /* The user issued a continue when stopped at a breakpoint.
1841 Set up for another trap and get out of here. */
1842 ecs
->another_trap
= 1;
1846 else if (step_through_delay
)
1848 /* The user issued a step when stopped at a breakpoint.
1849 Maybe we should stop, maybe we should not - the delay
1850 slot *might* correspond to a line of source. In any
1851 case, don't decide that here, just set ecs->another_trap,
1852 making sure we single-step again before breakpoints are
1854 ecs
->another_trap
= 1;
1858 /* Look at the cause of the stop, and decide what to do.
1859 The alternatives are:
1860 1) break; to really stop and return to the debugger,
1861 2) drop through to start up again
1862 (set ecs->another_trap to 1 to single step once)
1863 3) set ecs->random_signal to 1, and the decision between 1 and 2
1864 will be made according to the signal handling tables. */
1866 /* First, distinguish signals caused by the debugger from signals
1867 that have to do with the program's own actions. Note that
1868 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1869 on the operating system version. Here we detect when a SIGILL or
1870 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1871 something similar for SIGSEGV, since a SIGSEGV will be generated
1872 when we're trying to execute a breakpoint instruction on a
1873 non-executable stack. This happens for call dummy breakpoints
1874 for architectures like SPARC that place call dummies on the
1877 if (stop_signal
== TARGET_SIGNAL_TRAP
1878 || (breakpoints_inserted
1879 && (stop_signal
== TARGET_SIGNAL_ILL
1880 || stop_signal
== TARGET_SIGNAL_SEGV
1881 || stop_signal
== TARGET_SIGNAL_EMT
))
1882 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1884 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1887 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
1888 stop_print_frame
= 0;
1889 stop_stepping (ecs
);
1893 /* This is originated from start_remote(), start_inferior() and
1894 shared libraries hook functions. */
1895 if (stop_soon
== STOP_QUIETLY
)
1898 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
1899 stop_stepping (ecs
);
1903 /* This originates from attach_command(). We need to overwrite
1904 the stop_signal here, because some kernels don't ignore a
1905 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1906 See more comments in inferior.h. */
1907 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1909 stop_stepping (ecs
);
1910 if (stop_signal
== TARGET_SIGNAL_STOP
)
1911 stop_signal
= TARGET_SIGNAL_0
;
1915 /* Don't even think about breakpoints if just proceeded over a
1917 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
)
1920 fprintf_unfiltered (gdb_stdlog
, "infrun: trap expected\n");
1921 bpstat_clear (&stop_bpstat
);
1925 /* See if there is a breakpoint at the current PC. */
1926 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
,
1927 stopped_by_watchpoint
);
1929 /* Following in case break condition called a
1931 stop_print_frame
= 1;
1934 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1935 at one stage in the past included checks for an inferior
1936 function call's call dummy's return breakpoint. The original
1937 comment, that went with the test, read:
1939 ``End of a stack dummy. Some systems (e.g. Sony news) give
1940 another signal besides SIGTRAP, so check here as well as
1943 If someone ever tries to get get call dummys on a
1944 non-executable stack to work (where the target would stop
1945 with something like a SIGSEGV), then those tests might need
1946 to be re-instated. Given, however, that the tests were only
1947 enabled when momentary breakpoints were not being used, I
1948 suspect that it won't be the case.
1950 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1951 be necessary for call dummies on a non-executable stack on
1954 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1956 = !(bpstat_explains_signal (stop_bpstat
)
1958 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1961 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1962 if (!ecs
->random_signal
)
1963 stop_signal
= TARGET_SIGNAL_TRAP
;
1967 /* When we reach this point, we've pretty much decided
1968 that the reason for stopping must've been a random
1969 (unexpected) signal. */
1972 ecs
->random_signal
= 1;
1974 process_event_stop_test
:
1975 /* For the program's own signals, act according to
1976 the signal handling tables. */
1978 if (ecs
->random_signal
)
1980 /* Signal not for debugging purposes. */
1984 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
1986 stopped_by_random_signal
= 1;
1988 if (signal_print
[stop_signal
])
1991 target_terminal_ours_for_output ();
1992 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1994 if (signal_stop
[stop_signal
])
1996 stop_stepping (ecs
);
1999 /* If not going to stop, give terminal back
2000 if we took it away. */
2002 target_terminal_inferior ();
2004 /* Clear the signal if it should not be passed. */
2005 if (signal_program
[stop_signal
] == 0)
2006 stop_signal
= TARGET_SIGNAL_0
;
2008 if (prev_pc
== read_pc ()
2009 && !breakpoints_inserted
2010 && breakpoint_here_p (read_pc ())
2011 && step_resume_breakpoint
== NULL
)
2013 /* We were just starting a new sequence, attempting to
2014 single-step off of a breakpoint and expecting a SIGTRAP.
2015 Intead this signal arrives. This signal will take us out
2016 of the stepping range so GDB needs to remember to, when
2017 the signal handler returns, resume stepping off that
2019 /* To simplify things, "continue" is forced to use the same
2020 code paths as single-step - set a breakpoint at the
2021 signal return address and then, once hit, step off that
2023 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2024 ecs
->step_after_step_resume_breakpoint
= 1;
2029 if (step_range_end
!= 0
2030 && stop_signal
!= TARGET_SIGNAL_0
2031 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
2032 && frame_id_eq (get_frame_id (get_current_frame ()),
2034 && step_resume_breakpoint
== NULL
)
2036 /* The inferior is about to take a signal that will take it
2037 out of the single step range. Set a breakpoint at the
2038 current PC (which is presumably where the signal handler
2039 will eventually return) and then allow the inferior to
2042 Note that this is only needed for a signal delivered
2043 while in the single-step range. Nested signals aren't a
2044 problem as they eventually all return. */
2045 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2050 /* Note: step_resume_breakpoint may be non-NULL. This occures
2051 when either there's a nested signal, or when there's a
2052 pending signal enabled just as the signal handler returns
2053 (leaving the inferior at the step-resume-breakpoint without
2054 actually executing it). Either way continue until the
2055 breakpoint is really hit. */
2060 /* Handle cases caused by hitting a breakpoint. */
2062 CORE_ADDR jmp_buf_pc
;
2063 struct bpstat_what what
;
2065 what
= bpstat_what (stop_bpstat
);
2067 if (what
.call_dummy
)
2069 stop_stack_dummy
= 1;
2072 switch (what
.main_action
)
2074 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2075 /* If we hit the breakpoint at longjmp, disable it for the
2076 duration of this command. Then, install a temporary
2077 breakpoint at the target of the jmp_buf. */
2079 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2080 disable_longjmp_breakpoint ();
2081 remove_breakpoints ();
2082 breakpoints_inserted
= 0;
2083 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
2089 /* Need to blow away step-resume breakpoint, as it
2090 interferes with us */
2091 if (step_resume_breakpoint
!= NULL
)
2093 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2096 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2097 ecs
->handling_longjmp
= 1; /* FIXME */
2101 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2102 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2104 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2105 remove_breakpoints ();
2106 breakpoints_inserted
= 0;
2107 disable_longjmp_breakpoint ();
2108 ecs
->handling_longjmp
= 0; /* FIXME */
2109 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2111 /* else fallthrough */
2113 case BPSTAT_WHAT_SINGLE
:
2115 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2116 if (breakpoints_inserted
)
2117 remove_breakpoints ();
2118 breakpoints_inserted
= 0;
2119 ecs
->another_trap
= 1;
2120 /* Still need to check other stuff, at least the case
2121 where we are stepping and step out of the right range. */
2124 case BPSTAT_WHAT_STOP_NOISY
:
2126 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2127 stop_print_frame
= 1;
2129 /* We are about to nuke the step_resume_breakpointt via the
2130 cleanup chain, so no need to worry about it here. */
2132 stop_stepping (ecs
);
2135 case BPSTAT_WHAT_STOP_SILENT
:
2137 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2138 stop_print_frame
= 0;
2140 /* We are about to nuke the step_resume_breakpoin via the
2141 cleanup chain, so no need to worry about it here. */
2143 stop_stepping (ecs
);
2146 case BPSTAT_WHAT_STEP_RESUME
:
2147 /* This proably demands a more elegant solution, but, yeah
2150 This function's use of the simple variable
2151 step_resume_breakpoint doesn't seem to accomodate
2152 simultaneously active step-resume bp's, although the
2153 breakpoint list certainly can.
2155 If we reach here and step_resume_breakpoint is already
2156 NULL, then apparently we have multiple active
2157 step-resume bp's. We'll just delete the breakpoint we
2158 stopped at, and carry on.
2160 Correction: what the code currently does is delete a
2161 step-resume bp, but it makes no effort to ensure that
2162 the one deleted is the one currently stopped at. MVS */
2165 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2167 if (step_resume_breakpoint
== NULL
)
2169 step_resume_breakpoint
=
2170 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2172 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2173 if (ecs
->step_after_step_resume_breakpoint
)
2175 /* Back when the step-resume breakpoint was inserted, we
2176 were trying to single-step off a breakpoint. Go back
2178 ecs
->step_after_step_resume_breakpoint
= 0;
2179 remove_breakpoints ();
2180 breakpoints_inserted
= 0;
2181 ecs
->another_trap
= 1;
2187 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2189 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_THROUGH_SIGTRAMP\n");
2190 /* If were waiting for a trap, hitting the step_resume_break
2191 doesn't count as getting it. */
2193 ecs
->another_trap
= 1;
2196 case BPSTAT_WHAT_CHECK_SHLIBS
:
2197 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2200 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2201 /* Remove breakpoints, we eventually want to step over the
2202 shlib event breakpoint, and SOLIB_ADD might adjust
2203 breakpoint addresses via breakpoint_re_set. */
2204 if (breakpoints_inserted
)
2205 remove_breakpoints ();
2206 breakpoints_inserted
= 0;
2208 /* Check for any newly added shared libraries if we're
2209 supposed to be adding them automatically. Switch
2210 terminal for any messages produced by
2211 breakpoint_re_set. */
2212 target_terminal_ours_for_output ();
2213 /* NOTE: cagney/2003-11-25: Make certain that the target
2214 stack's section table is kept up-to-date. Architectures,
2215 (e.g., PPC64), use the section table to perform
2216 operations such as address => section name and hence
2217 require the table to contain all sections (including
2218 those found in shared libraries). */
2219 /* NOTE: cagney/2003-11-25: Pass current_target and not
2220 exec_ops to SOLIB_ADD. This is because current GDB is
2221 only tooled to propagate section_table changes out from
2222 the "current_target" (see target_resize_to_sections), and
2223 not up from the exec stratum. This, of course, isn't
2224 right. "infrun.c" should only interact with the
2225 exec/process stratum, instead relying on the target stack
2226 to propagate relevant changes (stop, section table
2227 changed, ...) up to other layers. */
2229 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2231 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2233 target_terminal_inferior ();
2235 /* Try to reenable shared library breakpoints, additional
2236 code segments in shared libraries might be mapped in now. */
2237 re_enable_breakpoints_in_shlibs ();
2239 /* If requested, stop when the dynamic linker notifies
2240 gdb of events. This allows the user to get control
2241 and place breakpoints in initializer routines for
2242 dynamically loaded objects (among other things). */
2243 if (stop_on_solib_events
|| stop_stack_dummy
)
2245 stop_stepping (ecs
);
2249 /* If we stopped due to an explicit catchpoint, then the
2250 (see above) call to SOLIB_ADD pulled in any symbols
2251 from a newly-loaded library, if appropriate.
2253 We do want the inferior to stop, but not where it is
2254 now, which is in the dynamic linker callback. Rather,
2255 we would like it stop in the user's program, just after
2256 the call that caused this catchpoint to trigger. That
2257 gives the user a more useful vantage from which to
2258 examine their program's state. */
2259 else if (what
.main_action
2260 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2262 /* ??rehrauer: If I could figure out how to get the
2263 right return PC from here, we could just set a temp
2264 breakpoint and resume. I'm not sure we can without
2265 cracking open the dld's shared libraries and sniffing
2266 their unwind tables and text/data ranges, and that's
2267 not a terribly portable notion.
2269 Until that time, we must step the inferior out of the
2270 dld callback, and also out of the dld itself (and any
2271 code or stubs in libdld.sl, such as "shl_load" and
2272 friends) until we reach non-dld code. At that point,
2273 we can stop stepping. */
2274 bpstat_get_triggered_catchpoints (stop_bpstat
,
2276 stepping_through_solib_catchpoints
);
2277 ecs
->stepping_through_solib_after_catch
= 1;
2279 /* Be sure to lift all breakpoints, so the inferior does
2280 actually step past this point... */
2281 ecs
->another_trap
= 1;
2286 /* We want to step over this breakpoint, then keep going. */
2287 ecs
->another_trap
= 1;
2293 case BPSTAT_WHAT_LAST
:
2294 /* Not a real code, but listed here to shut up gcc -Wall. */
2296 case BPSTAT_WHAT_KEEP_CHECKING
:
2301 /* We come here if we hit a breakpoint but should not
2302 stop for it. Possibly we also were stepping
2303 and should stop for that. So fall through and
2304 test for stepping. But, if not stepping,
2307 /* Are we stepping to get the inferior out of the dynamic linker's
2308 hook (and possibly the dld itself) after catching a shlib
2310 if (ecs
->stepping_through_solib_after_catch
)
2312 #if defined(SOLIB_ADD)
2313 /* Have we reached our destination? If not, keep going. */
2314 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2317 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2318 ecs
->another_trap
= 1;
2324 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2325 /* Else, stop and report the catchpoint(s) whose triggering
2326 caused us to begin stepping. */
2327 ecs
->stepping_through_solib_after_catch
= 0;
2328 bpstat_clear (&stop_bpstat
);
2329 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2330 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2331 stop_print_frame
= 1;
2332 stop_stepping (ecs
);
2336 if (step_resume_breakpoint
)
2339 fprintf_unfiltered (gdb_stdlog
, "infrun: step-resume breakpoint\n");
2341 /* Having a step-resume breakpoint overrides anything
2342 else having to do with stepping commands until
2343 that breakpoint is reached. */
2348 if (step_range_end
== 0)
2351 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
2352 /* Likewise if we aren't even stepping. */
2357 /* If stepping through a line, keep going if still within it.
2359 Note that step_range_end is the address of the first instruction
2360 beyond the step range, and NOT the address of the last instruction
2362 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2365 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
2366 paddr_nz (step_range_start
),
2367 paddr_nz (step_range_end
));
2372 /* We stepped out of the stepping range. */
2374 /* If we are stepping at the source level and entered the runtime
2375 loader dynamic symbol resolution code, we keep on single stepping
2376 until we exit the run time loader code and reach the callee's
2378 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2379 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2380 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
)
2382 && in_solib_dynsym_resolve_code (stop_pc
)
2386 CORE_ADDR pc_after_resolver
=
2387 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2390 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
2392 if (pc_after_resolver
)
2394 /* Set up a step-resume breakpoint at the address
2395 indicated by SKIP_SOLIB_RESOLVER. */
2396 struct symtab_and_line sr_sal
;
2398 sr_sal
.pc
= pc_after_resolver
;
2400 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2407 if (step_range_end
!= 1
2408 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2409 || step_over_calls
== STEP_OVER_ALL
)
2410 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2413 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
2414 /* The inferior, while doing a "step" or "next", has ended up in
2415 a signal trampoline (either by a signal being delivered or by
2416 the signal handler returning). Just single-step until the
2417 inferior leaves the trampoline (either by calling the handler
2423 /* Check for subroutine calls. The check for the current frame
2424 equalling the step ID is not necessary - the check of the
2425 previous frame's ID is sufficient - but it is a common case and
2426 cheaper than checking the previous frame's ID.
2428 NOTE: frame_id_eq will never report two invalid frame IDs as
2429 being equal, so to get into this block, both the current and
2430 previous frame must have valid frame IDs. */
2431 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
)
2432 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2434 CORE_ADDR real_stop_pc
;
2437 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
2439 if ((step_over_calls
== STEP_OVER_NONE
)
2440 || ((step_range_end
== 1)
2441 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2443 /* I presume that step_over_calls is only 0 when we're
2444 supposed to be stepping at the assembly language level
2445 ("stepi"). Just stop. */
2446 /* Also, maybe we just did a "nexti" inside a prolog, so we
2447 thought it was a subroutine call but it was not. Stop as
2450 print_stop_reason (END_STEPPING_RANGE
, 0);
2451 stop_stepping (ecs
);
2455 if (step_over_calls
== STEP_OVER_ALL
)
2457 /* We're doing a "next", set a breakpoint at callee's return
2458 address (the address at which the caller will
2460 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2465 /* If we are in a function call trampoline (a stub between the
2466 calling routine and the real function), locate the real
2467 function. That's what tells us (a) whether we want to step
2468 into it at all, and (b) what prologue we want to run to the
2469 end of, if we do step into it. */
2470 real_stop_pc
= skip_language_trampoline (stop_pc
);
2471 if (real_stop_pc
== 0)
2472 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2473 if (real_stop_pc
!= 0)
2474 ecs
->stop_func_start
= real_stop_pc
;
2477 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2478 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
)
2480 in_solib_dynsym_resolve_code (ecs
->stop_func_start
)
2484 struct symtab_and_line sr_sal
;
2486 sr_sal
.pc
= ecs
->stop_func_start
;
2488 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2493 /* If we have line number information for the function we are
2494 thinking of stepping into, step into it.
2496 If there are several symtabs at that PC (e.g. with include
2497 files), just want to know whether *any* of them have line
2498 numbers. find_pc_line handles this. */
2500 struct symtab_and_line tmp_sal
;
2502 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2503 if (tmp_sal
.line
!= 0)
2505 step_into_function (ecs
);
2510 /* If we have no line number and the step-stop-if-no-debug is
2511 set, we stop the step so that the user has a chance to switch
2512 in assembly mode. */
2513 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2516 print_stop_reason (END_STEPPING_RANGE
, 0);
2517 stop_stepping (ecs
);
2521 /* Set a breakpoint at callee's return address (the address at
2522 which the caller will resume). */
2523 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2528 /* If we're in the return path from a shared library trampoline,
2529 we want to proceed through the trampoline when stepping. */
2530 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2532 /* Determine where this trampoline returns. */
2533 CORE_ADDR real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2536 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
2538 /* Only proceed through if we know where it's going. */
2541 /* And put the step-breakpoint there and go until there. */
2542 struct symtab_and_line sr_sal
;
2544 init_sal (&sr_sal
); /* initialize to zeroes */
2545 sr_sal
.pc
= real_stop_pc
;
2546 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2548 /* Do not specify what the fp should be when we stop since
2549 on some machines the prologue is where the new fp value
2551 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2553 /* Restart without fiddling with the step ranges or
2560 ecs
->sal
= find_pc_line (stop_pc
, 0);
2562 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2563 the trampoline processing logic, however, there are some trampolines
2564 that have no names, so we should do trampoline handling first. */
2565 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2566 && ecs
->stop_func_name
== NULL
2567 && ecs
->sal
.line
== 0)
2570 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
2572 /* The inferior just stepped into, or returned to, an
2573 undebuggable function (where there is no debugging information
2574 and no line number corresponding to the address where the
2575 inferior stopped). Since we want to skip this kind of code,
2576 we keep going until the inferior returns from this
2577 function - unless the user has asked us not to (via
2578 set step-mode) or we no longer know how to get back
2579 to the call site. */
2580 if (step_stop_if_no_debug
2581 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2583 /* If we have no line number and the step-stop-if-no-debug
2584 is set, we stop the step so that the user has a chance to
2585 switch in assembly mode. */
2587 print_stop_reason (END_STEPPING_RANGE
, 0);
2588 stop_stepping (ecs
);
2593 /* Set a breakpoint at callee's return address (the address
2594 at which the caller will resume). */
2595 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2601 if (step_range_end
== 1)
2603 /* It is stepi or nexti. We always want to stop stepping after
2606 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
2608 print_stop_reason (END_STEPPING_RANGE
, 0);
2609 stop_stepping (ecs
);
2613 if (ecs
->sal
.line
== 0)
2615 /* We have no line number information. That means to stop
2616 stepping (does this always happen right after one instruction,
2617 when we do "s" in a function with no line numbers,
2618 or can this happen as a result of a return or longjmp?). */
2620 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
2622 print_stop_reason (END_STEPPING_RANGE
, 0);
2623 stop_stepping (ecs
);
2627 if ((stop_pc
== ecs
->sal
.pc
)
2628 && (ecs
->current_line
!= ecs
->sal
.line
2629 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2631 /* We are at the start of a different line. So stop. Note that
2632 we don't stop if we step into the middle of a different line.
2633 That is said to make things like for (;;) statements work
2636 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
2638 print_stop_reason (END_STEPPING_RANGE
, 0);
2639 stop_stepping (ecs
);
2643 /* We aren't done stepping.
2645 Optimize by setting the stepping range to the line.
2646 (We might not be in the original line, but if we entered a
2647 new line in mid-statement, we continue stepping. This makes
2648 things like for(;;) statements work better.) */
2650 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2652 /* If this is the last line of the function, don't keep stepping
2653 (it would probably step us out of the function).
2654 This is particularly necessary for a one-line function,
2655 in which after skipping the prologue we better stop even though
2656 we will be in mid-line. */
2658 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different function\n");
2660 print_stop_reason (END_STEPPING_RANGE
, 0);
2661 stop_stepping (ecs
);
2664 step_range_start
= ecs
->sal
.pc
;
2665 step_range_end
= ecs
->sal
.end
;
2666 step_frame_id
= get_frame_id (get_current_frame ());
2667 ecs
->current_line
= ecs
->sal
.line
;
2668 ecs
->current_symtab
= ecs
->sal
.symtab
;
2670 /* In the case where we just stepped out of a function into the
2671 middle of a line of the caller, continue stepping, but
2672 step_frame_id must be modified to current frame */
2674 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2675 generous. It will trigger on things like a step into a frameless
2676 stackless leaf function. I think the logic should instead look
2677 at the unwound frame ID has that should give a more robust
2678 indication of what happened. */
2679 if (step
- ID
== current
- ID
)
2680 still stepping in same function
;
2681 else if (step
- ID
== unwind (current
- ID
))
2682 stepped into a function
;
2684 stepped out of a function
;
2685 /* Of course this assumes that the frame ID unwind code is robust
2686 and we're willing to introduce frame unwind logic into this
2687 function. Fortunately, those days are nearly upon us. */
2690 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2691 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2692 step_frame_id
= current_frame
;
2696 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
2700 /* Are we in the middle of stepping? */
2703 currently_stepping (struct execution_control_state
*ecs
)
2705 return ((!ecs
->handling_longjmp
2706 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2708 || ecs
->stepping_through_solib_after_catch
2709 || bpstat_should_step ());
2712 /* Subroutine call with source code we should not step over. Do step
2713 to the first line of code in it. */
2716 step_into_function (struct execution_control_state
*ecs
)
2719 struct symtab_and_line sr_sal
;
2721 s
= find_pc_symtab (stop_pc
);
2722 if (s
&& s
->language
!= language_asm
)
2723 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2725 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2726 /* Use the step_resume_break to step until the end of the prologue,
2727 even if that involves jumps (as it seems to on the vax under
2729 /* If the prologue ends in the middle of a source line, continue to
2730 the end of that source line (if it is still within the function).
2731 Otherwise, just go to end of prologue. */
2733 && ecs
->sal
.pc
!= ecs
->stop_func_start
2734 && ecs
->sal
.end
< ecs
->stop_func_end
)
2735 ecs
->stop_func_start
= ecs
->sal
.end
;
2737 /* Architectures which require breakpoint adjustment might not be able
2738 to place a breakpoint at the computed address. If so, the test
2739 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2740 ecs->stop_func_start to an address at which a breakpoint may be
2741 legitimately placed.
2743 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2744 made, GDB will enter an infinite loop when stepping through
2745 optimized code consisting of VLIW instructions which contain
2746 subinstructions corresponding to different source lines. On
2747 FR-V, it's not permitted to place a breakpoint on any but the
2748 first subinstruction of a VLIW instruction. When a breakpoint is
2749 set, GDB will adjust the breakpoint address to the beginning of
2750 the VLIW instruction. Thus, we need to make the corresponding
2751 adjustment here when computing the stop address. */
2753 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2755 ecs
->stop_func_start
2756 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2757 ecs
->stop_func_start
);
2760 if (ecs
->stop_func_start
== stop_pc
)
2762 /* We are already there: stop now. */
2764 print_stop_reason (END_STEPPING_RANGE
, 0);
2765 stop_stepping (ecs
);
2770 /* Put the step-breakpoint there and go until there. */
2771 init_sal (&sr_sal
); /* initialize to zeroes */
2772 sr_sal
.pc
= ecs
->stop_func_start
;
2773 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2775 /* Do not specify what the fp should be when we stop since on
2776 some machines the prologue is where the new fp value is
2778 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2780 /* And make sure stepping stops right away then. */
2781 step_range_end
= step_range_start
;
2786 /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID.
2787 This is used to both functions and to skip over code. */
2790 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
2791 struct frame_id sr_id
)
2793 /* There should never be more than one step-resume breakpoint per
2794 thread, so we should never be setting a new
2795 step_resume_breakpoint when one is already active. */
2796 gdb_assert (step_resume_breakpoint
== NULL
);
2797 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
2799 if (breakpoints_inserted
)
2800 insert_breakpoints ();
2803 /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used
2804 to skip a potential signal handler.
2806 This is called with the interrupted function's frame. The signal
2807 handler, when it returns, will resume the interrupted function at
2811 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
2813 struct symtab_and_line sr_sal
;
2815 init_sal (&sr_sal
); /* initialize to zeros */
2817 sr_sal
.pc
= ADDR_BITS_REMOVE (get_frame_pc (return_frame
));
2818 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2820 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
2823 /* Similar to insert_step_resume_breakpoint_at_frame, except
2824 but a breakpoint at the previous frame's PC. This is used to
2825 skip a function after stepping into it (for "next" or if the called
2826 function has no debugging information).
2828 The current function has almost always been reached by single
2829 stepping a call or return instruction. NEXT_FRAME belongs to the
2830 current function, and the breakpoint will be set at the caller's
2833 This is a separate function rather than reusing
2834 insert_step_resume_breakpoint_at_frame in order to avoid
2835 get_prev_frame, which may stop prematurely (see the implementation
2836 of frame_unwind_id for an example). */
2839 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
2841 struct symtab_and_line sr_sal
;
2843 /* We shouldn't have gotten here if we don't know where the call site
2845 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
2847 init_sal (&sr_sal
); /* initialize to zeros */
2849 sr_sal
.pc
= ADDR_BITS_REMOVE (frame_pc_unwind (next_frame
));
2850 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2852 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
2856 stop_stepping (struct execution_control_state
*ecs
)
2859 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
2861 /* Let callers know we don't want to wait for the inferior anymore. */
2862 ecs
->wait_some_more
= 0;
2865 /* This function handles various cases where we need to continue
2866 waiting for the inferior. */
2867 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2870 keep_going (struct execution_control_state
*ecs
)
2872 /* Save the pc before execution, to compare with pc after stop. */
2873 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2875 /* If we did not do break;, it means we should keep running the
2876 inferior and not return to debugger. */
2878 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2880 /* We took a signal (which we are supposed to pass through to
2881 the inferior, else we'd have done a break above) and we
2882 haven't yet gotten our trap. Simply continue. */
2883 resume (currently_stepping (ecs
), stop_signal
);
2887 /* Either the trap was not expected, but we are continuing
2888 anyway (the user asked that this signal be passed to the
2891 The signal was SIGTRAP, e.g. it was our signal, but we
2892 decided we should resume from it.
2894 We're going to run this baby now! */
2896 if (!breakpoints_inserted
&& !ecs
->another_trap
)
2898 /* Stop stepping when inserting breakpoints
2900 if (insert_breakpoints () != 0)
2902 stop_stepping (ecs
);
2905 breakpoints_inserted
= 1;
2908 trap_expected
= ecs
->another_trap
;
2910 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2911 specifies that such a signal should be delivered to the
2914 Typically, this would occure when a user is debugging a
2915 target monitor on a simulator: the target monitor sets a
2916 breakpoint; the simulator encounters this break-point and
2917 halts the simulation handing control to GDB; GDB, noteing
2918 that the break-point isn't valid, returns control back to the
2919 simulator; the simulator then delivers the hardware
2920 equivalent of a SIGNAL_TRAP to the program being debugged. */
2922 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2923 stop_signal
= TARGET_SIGNAL_0
;
2926 resume (currently_stepping (ecs
), stop_signal
);
2929 prepare_to_wait (ecs
);
2932 /* This function normally comes after a resume, before
2933 handle_inferior_event exits. It takes care of any last bits of
2934 housekeeping, and sets the all-important wait_some_more flag. */
2937 prepare_to_wait (struct execution_control_state
*ecs
)
2940 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
2941 if (ecs
->infwait_state
== infwait_normal_state
)
2943 overlay_cache_invalid
= 1;
2945 /* We have to invalidate the registers BEFORE calling
2946 target_wait because they can be loaded from the target while
2947 in target_wait. This makes remote debugging a bit more
2948 efficient for those targets that provide critical registers
2949 as part of their normal status mechanism. */
2951 registers_changed ();
2952 ecs
->waiton_ptid
= pid_to_ptid (-1);
2953 ecs
->wp
= &(ecs
->ws
);
2955 /* This is the old end of the while loop. Let everybody know we
2956 want to wait for the inferior some more and get called again
2958 ecs
->wait_some_more
= 1;
2961 /* Print why the inferior has stopped. We always print something when
2962 the inferior exits, or receives a signal. The rest of the cases are
2963 dealt with later on in normal_stop() and print_it_typical(). Ideally
2964 there should be a call to this function from handle_inferior_event()
2965 each time stop_stepping() is called.*/
2967 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2969 switch (stop_reason
)
2971 case END_STEPPING_RANGE
:
2972 /* We are done with a step/next/si/ni command. */
2973 /* For now print nothing. */
2974 /* Print a message only if not in the middle of doing a "step n"
2975 operation for n > 1 */
2976 if (!step_multi
|| !stop_step
)
2977 if (ui_out_is_mi_like_p (uiout
))
2980 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
2983 /* The inferior was terminated by a signal. */
2984 annotate_signalled ();
2985 if (ui_out_is_mi_like_p (uiout
))
2988 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
2989 ui_out_text (uiout
, "\nProgram terminated with signal ");
2990 annotate_signal_name ();
2991 ui_out_field_string (uiout
, "signal-name",
2992 target_signal_to_name (stop_info
));
2993 annotate_signal_name_end ();
2994 ui_out_text (uiout
, ", ");
2995 annotate_signal_string ();
2996 ui_out_field_string (uiout
, "signal-meaning",
2997 target_signal_to_string (stop_info
));
2998 annotate_signal_string_end ();
2999 ui_out_text (uiout
, ".\n");
3000 ui_out_text (uiout
, "The program no longer exists.\n");
3003 /* The inferior program is finished. */
3004 annotate_exited (stop_info
);
3007 if (ui_out_is_mi_like_p (uiout
))
3008 ui_out_field_string (uiout
, "reason",
3009 async_reason_lookup (EXEC_ASYNC_EXITED
));
3010 ui_out_text (uiout
, "\nProgram exited with code ");
3011 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3012 (unsigned int) stop_info
);
3013 ui_out_text (uiout
, ".\n");
3017 if (ui_out_is_mi_like_p (uiout
))
3020 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
3021 ui_out_text (uiout
, "\nProgram exited normally.\n");
3023 /* Support the --return-child-result option. */
3024 return_child_result_value
= stop_info
;
3026 case SIGNAL_RECEIVED
:
3027 /* Signal received. The signal table tells us to print about
3030 ui_out_text (uiout
, "\nProgram received signal ");
3031 annotate_signal_name ();
3032 if (ui_out_is_mi_like_p (uiout
))
3034 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3035 ui_out_field_string (uiout
, "signal-name",
3036 target_signal_to_name (stop_info
));
3037 annotate_signal_name_end ();
3038 ui_out_text (uiout
, ", ");
3039 annotate_signal_string ();
3040 ui_out_field_string (uiout
, "signal-meaning",
3041 target_signal_to_string (stop_info
));
3042 annotate_signal_string_end ();
3043 ui_out_text (uiout
, ".\n");
3046 internal_error (__FILE__
, __LINE__
,
3047 _("print_stop_reason: unrecognized enum value"));
3053 /* Here to return control to GDB when the inferior stops for real.
3054 Print appropriate messages, remove breakpoints, give terminal our modes.
3056 STOP_PRINT_FRAME nonzero means print the executing frame
3057 (pc, function, args, file, line number and line text).
3058 BREAKPOINTS_FAILED nonzero means stop was due to error
3059 attempting to insert breakpoints. */
3064 struct target_waitstatus last
;
3067 get_last_target_status (&last_ptid
, &last
);
3069 /* As with the notification of thread events, we want to delay
3070 notifying the user that we've switched thread context until
3071 the inferior actually stops.
3073 There's no point in saying anything if the inferior has exited.
3074 Note that SIGNALLED here means "exited with a signal", not
3075 "received a signal". */
3076 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3077 && target_has_execution
3078 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3079 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3081 target_terminal_ours_for_output ();
3082 printf_filtered (_("[Switching to %s]\n"),
3083 target_pid_or_tid_to_str (inferior_ptid
));
3084 previous_inferior_ptid
= inferior_ptid
;
3087 /* NOTE drow/2004-01-17: Is this still necessary? */
3088 /* Make sure that the current_frame's pc is correct. This
3089 is a correction for setting up the frame info before doing
3090 DECR_PC_AFTER_BREAK */
3091 if (target_has_execution
)
3092 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3093 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3094 frame code to check for this and sort out any resultant mess.
3095 DECR_PC_AFTER_BREAK needs to just go away. */
3096 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3098 if (target_has_execution
&& breakpoints_inserted
)
3100 if (remove_breakpoints ())
3102 target_terminal_ours_for_output ();
3103 printf_filtered (_("\
3104 Cannot remove breakpoints because program is no longer writable.\n\
3105 It might be running in another process.\n\
3106 Further execution is probably impossible.\n"));
3109 breakpoints_inserted
= 0;
3111 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3112 Delete any breakpoint that is to be deleted at the next stop. */
3114 breakpoint_auto_delete (stop_bpstat
);
3116 /* If an auto-display called a function and that got a signal,
3117 delete that auto-display to avoid an infinite recursion. */
3119 if (stopped_by_random_signal
)
3120 disable_current_display ();
3122 /* Don't print a message if in the middle of doing a "step n"
3123 operation for n > 1 */
3124 if (step_multi
&& stop_step
)
3127 target_terminal_ours ();
3129 /* Set the current source location. This will also happen if we
3130 display the frame below, but the current SAL will be incorrect
3131 during a user hook-stop function. */
3132 if (target_has_stack
&& !stop_stack_dummy
)
3133 set_current_sal_from_frame (get_current_frame (), 1);
3135 /* Look up the hook_stop and run it (CLI internally handles problem
3136 of stop_command's pre-hook not existing). */
3138 catch_errors (hook_stop_stub
, stop_command
,
3139 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3141 if (!target_has_stack
)
3147 /* Select innermost stack frame - i.e., current frame is frame 0,
3148 and current location is based on that.
3149 Don't do this on return from a stack dummy routine,
3150 or if the program has exited. */
3152 if (!stop_stack_dummy
)
3154 select_frame (get_current_frame ());
3156 /* Print current location without a level number, if
3157 we have changed functions or hit a breakpoint.
3158 Print source line if we have one.
3159 bpstat_print() contains the logic deciding in detail
3160 what to print, based on the event(s) that just occurred. */
3162 if (stop_print_frame
)
3166 int do_frame_printing
= 1;
3168 bpstat_ret
= bpstat_print (stop_bpstat
);
3172 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3173 (or should) carry around the function and does (or
3174 should) use that when doing a frame comparison. */
3176 && frame_id_eq (step_frame_id
,
3177 get_frame_id (get_current_frame ()))
3178 && step_start_function
== find_pc_function (stop_pc
))
3179 source_flag
= SRC_LINE
; /* finished step, just print source line */
3181 source_flag
= SRC_AND_LOC
; /* print location and source line */
3183 case PRINT_SRC_AND_LOC
:
3184 source_flag
= SRC_AND_LOC
; /* print location and source line */
3186 case PRINT_SRC_ONLY
:
3187 source_flag
= SRC_LINE
;
3190 source_flag
= SRC_LINE
; /* something bogus */
3191 do_frame_printing
= 0;
3194 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3196 /* For mi, have the same behavior every time we stop:
3197 print everything but the source line. */
3198 if (ui_out_is_mi_like_p (uiout
))
3199 source_flag
= LOC_AND_ADDRESS
;
3201 if (ui_out_is_mi_like_p (uiout
))
3202 ui_out_field_int (uiout
, "thread-id",
3203 pid_to_thread_id (inferior_ptid
));
3204 /* The behavior of this routine with respect to the source
3206 SRC_LINE: Print only source line
3207 LOCATION: Print only location
3208 SRC_AND_LOC: Print location and source line */
3209 if (do_frame_printing
)
3210 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3212 /* Display the auto-display expressions. */
3217 /* Save the function value return registers, if we care.
3218 We might be about to restore their previous contents. */
3219 if (proceed_to_finish
)
3220 /* NB: The copy goes through to the target picking up the value of
3221 all the registers. */
3222 regcache_cpy (stop_registers
, current_regcache
);
3224 if (stop_stack_dummy
)
3226 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3227 ends with a setting of the current frame, so we can use that
3229 frame_pop (get_current_frame ());
3230 /* Set stop_pc to what it was before we called the function.
3231 Can't rely on restore_inferior_status because that only gets
3232 called if we don't stop in the called function. */
3233 stop_pc
= read_pc ();
3234 select_frame (get_current_frame ());
3238 annotate_stopped ();
3239 observer_notify_normal_stop (stop_bpstat
);
3243 hook_stop_stub (void *cmd
)
3245 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3250 signal_stop_state (int signo
)
3252 return signal_stop
[signo
];
3256 signal_print_state (int signo
)
3258 return signal_print
[signo
];
3262 signal_pass_state (int signo
)
3264 return signal_program
[signo
];
3268 signal_stop_update (int signo
, int state
)
3270 int ret
= signal_stop
[signo
];
3271 signal_stop
[signo
] = state
;
3276 signal_print_update (int signo
, int state
)
3278 int ret
= signal_print
[signo
];
3279 signal_print
[signo
] = state
;
3284 signal_pass_update (int signo
, int state
)
3286 int ret
= signal_program
[signo
];
3287 signal_program
[signo
] = state
;
3292 sig_print_header (void)
3294 printf_filtered (_("\
3295 Signal Stop\tPrint\tPass to program\tDescription\n"));
3299 sig_print_info (enum target_signal oursig
)
3301 char *name
= target_signal_to_name (oursig
);
3302 int name_padding
= 13 - strlen (name
);
3304 if (name_padding
<= 0)
3307 printf_filtered ("%s", name
);
3308 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3309 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3310 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3311 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3312 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3315 /* Specify how various signals in the inferior should be handled. */
3318 handle_command (char *args
, int from_tty
)
3321 int digits
, wordlen
;
3322 int sigfirst
, signum
, siglast
;
3323 enum target_signal oursig
;
3326 unsigned char *sigs
;
3327 struct cleanup
*old_chain
;
3331 error_no_arg (_("signal to handle"));
3334 /* Allocate and zero an array of flags for which signals to handle. */
3336 nsigs
= (int) TARGET_SIGNAL_LAST
;
3337 sigs
= (unsigned char *) alloca (nsigs
);
3338 memset (sigs
, 0, nsigs
);
3340 /* Break the command line up into args. */
3342 argv
= buildargv (args
);
3347 old_chain
= make_cleanup_freeargv (argv
);
3349 /* Walk through the args, looking for signal oursigs, signal names, and
3350 actions. Signal numbers and signal names may be interspersed with
3351 actions, with the actions being performed for all signals cumulatively
3352 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3354 while (*argv
!= NULL
)
3356 wordlen
= strlen (*argv
);
3357 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3361 sigfirst
= siglast
= -1;
3363 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3365 /* Apply action to all signals except those used by the
3366 debugger. Silently skip those. */
3369 siglast
= nsigs
- 1;
3371 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3373 SET_SIGS (nsigs
, sigs
, signal_stop
);
3374 SET_SIGS (nsigs
, sigs
, signal_print
);
3376 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3378 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3380 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3382 SET_SIGS (nsigs
, sigs
, signal_print
);
3384 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3386 SET_SIGS (nsigs
, sigs
, signal_program
);
3388 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3390 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3392 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3394 SET_SIGS (nsigs
, sigs
, signal_program
);
3396 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3398 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3399 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3401 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3403 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3405 else if (digits
> 0)
3407 /* It is numeric. The numeric signal refers to our own
3408 internal signal numbering from target.h, not to host/target
3409 signal number. This is a feature; users really should be
3410 using symbolic names anyway, and the common ones like
3411 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3413 sigfirst
= siglast
= (int)
3414 target_signal_from_command (atoi (*argv
));
3415 if ((*argv
)[digits
] == '-')
3418 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3420 if (sigfirst
> siglast
)
3422 /* Bet he didn't figure we'd think of this case... */
3430 oursig
= target_signal_from_name (*argv
);
3431 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3433 sigfirst
= siglast
= (int) oursig
;
3437 /* Not a number and not a recognized flag word => complain. */
3438 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
3442 /* If any signal numbers or symbol names were found, set flags for
3443 which signals to apply actions to. */
3445 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3447 switch ((enum target_signal
) signum
)
3449 case TARGET_SIGNAL_TRAP
:
3450 case TARGET_SIGNAL_INT
:
3451 if (!allsigs
&& !sigs
[signum
])
3453 if (query ("%s is used by the debugger.\n\
3454 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3460 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3461 gdb_flush (gdb_stdout
);
3465 case TARGET_SIGNAL_0
:
3466 case TARGET_SIGNAL_DEFAULT
:
3467 case TARGET_SIGNAL_UNKNOWN
:
3468 /* Make sure that "all" doesn't print these. */
3479 target_notice_signals (inferior_ptid
);
3483 /* Show the results. */
3484 sig_print_header ();
3485 for (signum
= 0; signum
< nsigs
; signum
++)
3489 sig_print_info (signum
);
3494 do_cleanups (old_chain
);
3498 xdb_handle_command (char *args
, int from_tty
)
3501 struct cleanup
*old_chain
;
3503 /* Break the command line up into args. */
3505 argv
= buildargv (args
);
3510 old_chain
= make_cleanup_freeargv (argv
);
3511 if (argv
[1] != (char *) NULL
)
3516 bufLen
= strlen (argv
[0]) + 20;
3517 argBuf
= (char *) xmalloc (bufLen
);
3521 enum target_signal oursig
;
3523 oursig
= target_signal_from_name (argv
[0]);
3524 memset (argBuf
, 0, bufLen
);
3525 if (strcmp (argv
[1], "Q") == 0)
3526 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3529 if (strcmp (argv
[1], "s") == 0)
3531 if (!signal_stop
[oursig
])
3532 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3534 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3536 else if (strcmp (argv
[1], "i") == 0)
3538 if (!signal_program
[oursig
])
3539 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3541 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3543 else if (strcmp (argv
[1], "r") == 0)
3545 if (!signal_print
[oursig
])
3546 sprintf (argBuf
, "%s %s", argv
[0], "print");
3548 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3554 handle_command (argBuf
, from_tty
);
3556 printf_filtered (_("Invalid signal handling flag.\n"));
3561 do_cleanups (old_chain
);
3564 /* Print current contents of the tables set by the handle command.
3565 It is possible we should just be printing signals actually used
3566 by the current target (but for things to work right when switching
3567 targets, all signals should be in the signal tables). */
3570 signals_info (char *signum_exp
, int from_tty
)
3572 enum target_signal oursig
;
3573 sig_print_header ();
3577 /* First see if this is a symbol name. */
3578 oursig
= target_signal_from_name (signum_exp
);
3579 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3581 /* No, try numeric. */
3583 target_signal_from_command (parse_and_eval_long (signum_exp
));
3585 sig_print_info (oursig
);
3589 printf_filtered ("\n");
3590 /* These ugly casts brought to you by the native VAX compiler. */
3591 for (oursig
= TARGET_SIGNAL_FIRST
;
3592 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3593 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3597 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3598 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3599 sig_print_info (oursig
);
3602 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3605 struct inferior_status
3607 enum target_signal stop_signal
;
3611 int stop_stack_dummy
;
3612 int stopped_by_random_signal
;
3614 CORE_ADDR step_range_start
;
3615 CORE_ADDR step_range_end
;
3616 struct frame_id step_frame_id
;
3617 enum step_over_calls_kind step_over_calls
;
3618 CORE_ADDR step_resume_break_address
;
3619 int stop_after_trap
;
3621 struct regcache
*stop_registers
;
3623 /* These are here because if call_function_by_hand has written some
3624 registers and then decides to call error(), we better not have changed
3626 struct regcache
*registers
;
3628 /* A frame unique identifier. */
3629 struct frame_id selected_frame_id
;
3631 int breakpoint_proceeded
;
3632 int restore_stack_info
;
3633 int proceed_to_finish
;
3637 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3640 int size
= register_size (current_gdbarch
, regno
);
3641 void *buf
= alloca (size
);
3642 store_signed_integer (buf
, size
, val
);
3643 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3646 /* Save all of the information associated with the inferior<==>gdb
3647 connection. INF_STATUS is a pointer to a "struct inferior_status"
3648 (defined in inferior.h). */
3650 struct inferior_status
*
3651 save_inferior_status (int restore_stack_info
)
3653 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3655 inf_status
->stop_signal
= stop_signal
;
3656 inf_status
->stop_pc
= stop_pc
;
3657 inf_status
->stop_step
= stop_step
;
3658 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3659 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3660 inf_status
->trap_expected
= trap_expected
;
3661 inf_status
->step_range_start
= step_range_start
;
3662 inf_status
->step_range_end
= step_range_end
;
3663 inf_status
->step_frame_id
= step_frame_id
;
3664 inf_status
->step_over_calls
= step_over_calls
;
3665 inf_status
->stop_after_trap
= stop_after_trap
;
3666 inf_status
->stop_soon
= stop_soon
;
3667 /* Save original bpstat chain here; replace it with copy of chain.
3668 If caller's caller is walking the chain, they'll be happier if we
3669 hand them back the original chain when restore_inferior_status is
3671 inf_status
->stop_bpstat
= stop_bpstat
;
3672 stop_bpstat
= bpstat_copy (stop_bpstat
);
3673 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3674 inf_status
->restore_stack_info
= restore_stack_info
;
3675 inf_status
->proceed_to_finish
= proceed_to_finish
;
3677 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3679 inf_status
->registers
= regcache_dup (current_regcache
);
3681 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
3686 restore_selected_frame (void *args
)
3688 struct frame_id
*fid
= (struct frame_id
*) args
;
3689 struct frame_info
*frame
;
3691 frame
= frame_find_by_id (*fid
);
3693 /* If inf_status->selected_frame_id is NULL, there was no previously
3697 warning (_("Unable to restore previously selected frame."));
3701 select_frame (frame
);
3707 restore_inferior_status (struct inferior_status
*inf_status
)
3709 stop_signal
= inf_status
->stop_signal
;
3710 stop_pc
= inf_status
->stop_pc
;
3711 stop_step
= inf_status
->stop_step
;
3712 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3713 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3714 trap_expected
= inf_status
->trap_expected
;
3715 step_range_start
= inf_status
->step_range_start
;
3716 step_range_end
= inf_status
->step_range_end
;
3717 step_frame_id
= inf_status
->step_frame_id
;
3718 step_over_calls
= inf_status
->step_over_calls
;
3719 stop_after_trap
= inf_status
->stop_after_trap
;
3720 stop_soon
= inf_status
->stop_soon
;
3721 bpstat_clear (&stop_bpstat
);
3722 stop_bpstat
= inf_status
->stop_bpstat
;
3723 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3724 proceed_to_finish
= inf_status
->proceed_to_finish
;
3726 /* FIXME: Is the restore of stop_registers always needed. */
3727 regcache_xfree (stop_registers
);
3728 stop_registers
= inf_status
->stop_registers
;
3730 /* The inferior can be gone if the user types "print exit(0)"
3731 (and perhaps other times). */
3732 if (target_has_execution
)
3733 /* NB: The register write goes through to the target. */
3734 regcache_cpy (current_regcache
, inf_status
->registers
);
3735 regcache_xfree (inf_status
->registers
);
3737 /* FIXME: If we are being called after stopping in a function which
3738 is called from gdb, we should not be trying to restore the
3739 selected frame; it just prints a spurious error message (The
3740 message is useful, however, in detecting bugs in gdb (like if gdb
3741 clobbers the stack)). In fact, should we be restoring the
3742 inferior status at all in that case? . */
3744 if (target_has_stack
&& inf_status
->restore_stack_info
)
3746 /* The point of catch_errors is that if the stack is clobbered,
3747 walking the stack might encounter a garbage pointer and
3748 error() trying to dereference it. */
3750 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3751 "Unable to restore previously selected frame:\n",
3752 RETURN_MASK_ERROR
) == 0)
3753 /* Error in restoring the selected frame. Select the innermost
3755 select_frame (get_current_frame ());
3763 do_restore_inferior_status_cleanup (void *sts
)
3765 restore_inferior_status (sts
);
3769 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3771 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3775 discard_inferior_status (struct inferior_status
*inf_status
)
3777 /* See save_inferior_status for info on stop_bpstat. */
3778 bpstat_clear (&inf_status
->stop_bpstat
);
3779 regcache_xfree (inf_status
->registers
);
3780 regcache_xfree (inf_status
->stop_registers
);
3785 inferior_has_forked (int pid
, int *child_pid
)
3787 struct target_waitstatus last
;
3790 get_last_target_status (&last_ptid
, &last
);
3792 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3795 if (ptid_get_pid (last_ptid
) != pid
)
3798 *child_pid
= last
.value
.related_pid
;
3803 inferior_has_vforked (int pid
, int *child_pid
)
3805 struct target_waitstatus last
;
3808 get_last_target_status (&last_ptid
, &last
);
3810 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3813 if (ptid_get_pid (last_ptid
) != pid
)
3816 *child_pid
= last
.value
.related_pid
;
3821 inferior_has_execd (int pid
, char **execd_pathname
)
3823 struct target_waitstatus last
;
3826 get_last_target_status (&last_ptid
, &last
);
3828 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3831 if (ptid_get_pid (last_ptid
) != pid
)
3834 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3838 /* Oft used ptids */
3840 ptid_t minus_one_ptid
;
3842 /* Create a ptid given the necessary PID, LWP, and TID components. */
3845 ptid_build (int pid
, long lwp
, long tid
)
3855 /* Create a ptid from just a pid. */
3858 pid_to_ptid (int pid
)
3860 return ptid_build (pid
, 0, 0);
3863 /* Fetch the pid (process id) component from a ptid. */
3866 ptid_get_pid (ptid_t ptid
)
3871 /* Fetch the lwp (lightweight process) component from a ptid. */
3874 ptid_get_lwp (ptid_t ptid
)
3879 /* Fetch the tid (thread id) component from a ptid. */
3882 ptid_get_tid (ptid_t ptid
)
3887 /* ptid_equal() is used to test equality of two ptids. */
3890 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3892 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3893 && ptid1
.tid
== ptid2
.tid
);
3896 /* restore_inferior_ptid() will be used by the cleanup machinery
3897 to restore the inferior_ptid value saved in a call to
3898 save_inferior_ptid(). */
3901 restore_inferior_ptid (void *arg
)
3903 ptid_t
*saved_ptid_ptr
= arg
;
3904 inferior_ptid
= *saved_ptid_ptr
;
3908 /* Save the value of inferior_ptid so that it may be restored by a
3909 later call to do_cleanups(). Returns the struct cleanup pointer
3910 needed for later doing the cleanup. */
3913 save_inferior_ptid (void)
3915 ptid_t
*saved_ptid_ptr
;
3917 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3918 *saved_ptid_ptr
= inferior_ptid
;
3919 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3926 stop_registers
= regcache_xmalloc (current_gdbarch
);
3930 _initialize_infrun (void)
3934 struct cmd_list_element
*c
;
3936 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers
);
3937 deprecated_register_gdbarch_swap (NULL
, 0, build_infrun
);
3939 add_info ("signals", signals_info
, _("\
3940 What debugger does when program gets various signals.\n\
3941 Specify a signal as argument to print info on that signal only."));
3942 add_info_alias ("handle", "signals", 0);
3944 add_com ("handle", class_run
, handle_command
, _("\
3945 Specify how to handle a signal.\n\
3946 Args are signals and actions to apply to those signals.\n\
3947 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3948 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3949 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3950 The special arg \"all\" is recognized to mean all signals except those\n\
3951 used by the debugger, typically SIGTRAP and SIGINT.\n\
3952 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3953 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3954 Stop means reenter debugger if this signal happens (implies print).\n\
3955 Print means print a message if this signal happens.\n\
3956 Pass means let program see this signal; otherwise program doesn't know.\n\
3957 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3958 Pass and Stop may be combined."));
3961 add_com ("lz", class_info
, signals_info
, _("\
3962 What debugger does when program gets various signals.\n\
3963 Specify a signal as argument to print info on that signal only."));
3964 add_com ("z", class_run
, xdb_handle_command
, _("\
3965 Specify how to handle a signal.\n\
3966 Args are signals and actions to apply to those signals.\n\
3967 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3968 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3969 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3970 The special arg \"all\" is recognized to mean all signals except those\n\
3971 used by the debugger, typically SIGTRAP and SIGINT.\n\
3972 Recognized actions include \"s\" (toggles between stop and nostop), \n\
3973 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3974 nopass), \"Q\" (noprint)\n\
3975 Stop means reenter debugger if this signal happens (implies print).\n\
3976 Print means print a message if this signal happens.\n\
3977 Pass means let program see this signal; otherwise program doesn't know.\n\
3978 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3979 Pass and Stop may be combined."));
3983 stop_command
= add_cmd ("stop", class_obscure
,
3984 not_just_help_class_command
, _("\
3985 There is no `stop' command, but you can set a hook on `stop'.\n\
3986 This allows you to set a list of commands to be run each time execution\n\
3987 of the program stops."), &cmdlist
);
3989 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
3990 Set inferior debugging."), _("\
3991 Show inferior debugging."), _("\
3992 When non-zero, inferior specific debugging is enabled."),
3995 &setdebuglist
, &showdebuglist
);
3997 numsigs
= (int) TARGET_SIGNAL_LAST
;
3998 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3999 signal_print
= (unsigned char *)
4000 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4001 signal_program
= (unsigned char *)
4002 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4003 for (i
= 0; i
< numsigs
; i
++)
4006 signal_print
[i
] = 1;
4007 signal_program
[i
] = 1;
4010 /* Signals caused by debugger's own actions
4011 should not be given to the program afterwards. */
4012 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4013 signal_program
[TARGET_SIGNAL_INT
] = 0;
4015 /* Signals that are not errors should not normally enter the debugger. */
4016 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4017 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4018 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4019 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4020 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4021 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4022 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4023 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4024 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4025 signal_print
[TARGET_SIGNAL_IO
] = 0;
4026 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4027 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4028 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4029 signal_print
[TARGET_SIGNAL_URG
] = 0;
4030 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4031 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4033 /* These signals are used internally by user-level thread
4034 implementations. (See signal(5) on Solaris.) Like the above
4035 signals, a healthy program receives and handles them as part of
4036 its normal operation. */
4037 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4038 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4039 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4040 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4041 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4042 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4044 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
4045 &stop_on_solib_events
, _("\
4046 Set stopping for shared library events."), _("\
4047 Show stopping for shared library events."), _("\
4048 If nonzero, gdb will give control to the user when the dynamic linker\n\
4049 notifies gdb of shared library events. The most common event of interest\n\
4050 to the user would be loading/unloading of a new library."),
4052 show_stop_on_solib_events
,
4053 &setlist
, &showlist
);
4055 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
4056 follow_fork_mode_kind_names
,
4057 &follow_fork_mode_string
, _("\
4058 Set debugger response to a program call of fork or vfork."), _("\
4059 Show debugger response to a program call of fork or vfork."), _("\
4060 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4061 parent - the original process is debugged after a fork\n\
4062 child - the new process is debugged after a fork\n\
4063 The unfollowed process will continue to run.\n\
4064 By default, the debugger will follow the parent process."),
4066 show_follow_fork_mode_string
,
4067 &setlist
, &showlist
);
4069 add_setshow_enum_cmd ("scheduler-locking", class_run
,
4070 scheduler_enums
, &scheduler_mode
, _("\
4071 Set mode for locking scheduler during execution."), _("\
4072 Show mode for locking scheduler during execution."), _("\
4073 off == no locking (threads may preempt at any time)\n\
4074 on == full locking (no thread except the current thread may run)\n\
4075 step == scheduler locked during every single-step operation.\n\
4076 In this mode, no other thread may run during a step command.\n\
4077 Other threads may run while stepping over a function call ('next')."),
4078 set_schedlock_func
, /* traps on target vector */
4079 show_scheduler_mode
,
4080 &setlist
, &showlist
);
4082 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
4083 Set mode of the step operation."), _("\
4084 Show mode of the step operation."), _("\
4085 When set, doing a step over a function without debug line information\n\
4086 will stop at the first instruction of that function. Otherwise, the\n\
4087 function is skipped and the step command stops at a different source line."),
4089 show_step_stop_if_no_debug
,
4090 &setlist
, &showlist
);
4092 /* ptid initializations */
4093 null_ptid
= ptid_build (0, 0, 0);
4094 minus_one_ptid
= ptid_build (-1, 0, 0);
4095 inferior_ptid
= null_ptid
;
4096 target_last_wait_ptid
= minus_one_ptid
;