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 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
24 #include "gdb_string.h"
29 #include "exceptions.h"
30 #include "breakpoint.h"
34 #include "cli/cli-script.h"
36 #include "gdbthread.h"
49 #include "gdb_assert.h"
50 #include "mi/mi-common.h"
52 /* Prototypes for local functions */
54 static void signals_info (char *, int);
56 static void handle_command (char *, int);
58 static void sig_print_info (enum target_signal
);
60 static void sig_print_header (void);
62 static void resume_cleanups (void *);
64 static int hook_stop_stub (void *);
66 static int restore_selected_frame (void *);
68 static void build_infrun (void);
70 static int follow_fork (void);
72 static void set_schedlock_func (char *args
, int from_tty
,
73 struct cmd_list_element
*c
);
75 struct execution_control_state
;
77 static int currently_stepping (struct execution_control_state
*ecs
);
79 static void xdb_handle_command (char *args
, int from_tty
);
81 static int prepare_to_proceed (int);
83 void _initialize_infrun (void);
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug
= 0;
90 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
91 struct cmd_list_element
*c
, const char *value
)
93 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
96 /* In asynchronous mode, but simulating synchronous execution. */
98 int sync_execution
= 0;
100 /* wait_for_inferior and normal_stop use this to notify the user
101 when the inferior stopped in a different thread than it had been
104 static ptid_t previous_inferior_ptid
;
106 static int debug_infrun
= 0;
108 show_debug_infrun (struct ui_file
*file
, int from_tty
,
109 struct cmd_list_element
*c
, const char *value
)
111 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
114 /* If the program uses ELF-style shared libraries, then calls to
115 functions in shared libraries go through stubs, which live in a
116 table called the PLT (Procedure Linkage Table). The first time the
117 function is called, the stub sends control to the dynamic linker,
118 which looks up the function's real address, patches the stub so
119 that future calls will go directly to the function, and then passes
120 control to the function.
122 If we are stepping at the source level, we don't want to see any of
123 this --- we just want to skip over the stub and the dynamic linker.
124 The simple approach is to single-step until control leaves the
127 However, on some systems (e.g., Red Hat's 5.2 distribution) the
128 dynamic linker calls functions in the shared C library, so you
129 can't tell from the PC alone whether the dynamic linker is still
130 running. In this case, we use a step-resume breakpoint to get us
131 past the dynamic linker, as if we were using "next" to step over a
134 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
135 linker code or not. Normally, this means we single-step. However,
136 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
137 address where we can place a step-resume breakpoint to get past the
138 linker's symbol resolution function.
140 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
141 pretty portable way, by comparing the PC against the address ranges
142 of the dynamic linker's sections.
144 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
145 it depends on internal details of the dynamic linker. It's usually
146 not too hard to figure out where to put a breakpoint, but it
147 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
148 sanity checking. If it can't figure things out, returning zero and
149 getting the (possibly confusing) stepping behavior is better than
150 signalling an error, which will obscure the change in the
153 /* This function returns TRUE if pc is the address of an instruction
154 that lies within the dynamic linker (such as the event hook, or the
157 This function must be used only when a dynamic linker event has
158 been caught, and the inferior is being stepped out of the hook, or
159 undefined results are guaranteed. */
161 #ifndef SOLIB_IN_DYNAMIC_LINKER
162 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
166 /* Convert the #defines into values. This is temporary until wfi control
167 flow is completely sorted out. */
169 #ifndef CANNOT_STEP_HW_WATCHPOINTS
170 #define CANNOT_STEP_HW_WATCHPOINTS 0
172 #undef CANNOT_STEP_HW_WATCHPOINTS
173 #define CANNOT_STEP_HW_WATCHPOINTS 1
176 /* Tables of how to react to signals; the user sets them. */
178 static unsigned char *signal_stop
;
179 static unsigned char *signal_print
;
180 static unsigned char *signal_program
;
182 #define SET_SIGS(nsigs,sigs,flags) \
184 int signum = (nsigs); \
185 while (signum-- > 0) \
186 if ((sigs)[signum]) \
187 (flags)[signum] = 1; \
190 #define UNSET_SIGS(nsigs,sigs,flags) \
192 int signum = (nsigs); \
193 while (signum-- > 0) \
194 if ((sigs)[signum]) \
195 (flags)[signum] = 0; \
198 /* Value to pass to target_resume() to cause all threads to resume */
200 #define RESUME_ALL (pid_to_ptid (-1))
202 /* Command list pointer for the "stop" placeholder. */
204 static struct cmd_list_element
*stop_command
;
206 /* Function inferior was in as of last step command. */
208 static struct symbol
*step_start_function
;
210 /* Nonzero if we are presently stepping over a breakpoint.
212 If we hit a breakpoint or watchpoint, and then continue,
213 we need to single step the current thread with breakpoints
214 disabled, to avoid hitting the same breakpoint or
215 watchpoint again. And we should step just a single
216 thread and keep other threads stopped, so that
217 other threads don't miss breakpoints while they are removed.
219 So, this variable simultaneously means that we need to single
220 step the current thread, keep other threads stopped, and that
221 breakpoints should be removed while we step.
223 This variable is set either:
224 - in proceed, when we resume inferior on user's explicit request
225 - in keep_going, if handle_inferior_event decides we need to
226 step over breakpoint.
228 The variable is cleared in clear_proceed_status, called every
229 time before we call proceed. The proceed calls wait_for_inferior,
230 which calls handle_inferior_event in a loop, and until
231 wait_for_inferior exits, this variable is changed only by keep_going. */
233 static int stepping_over_breakpoint
;
235 /* Nonzero if we want to give control to the user when we're notified
236 of shared library events by the dynamic linker. */
237 static int stop_on_solib_events
;
239 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
240 struct cmd_list_element
*c
, const char *value
)
242 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
246 /* Nonzero means expecting a trace trap
247 and should stop the inferior and return silently when it happens. */
251 /* Nonzero means expecting a trap and caller will handle it themselves.
252 It is used after attach, due to attaching to a process;
253 when running in the shell before the child program has been exec'd;
254 and when running some kinds of remote stuff (FIXME?). */
256 enum stop_kind stop_soon
;
258 /* Nonzero if proceed is being used for a "finish" command or a similar
259 situation when stop_registers should be saved. */
261 int proceed_to_finish
;
263 /* Save register contents here when about to pop a stack dummy frame,
264 if-and-only-if proceed_to_finish is set.
265 Thus this contains the return value from the called function (assuming
266 values are returned in a register). */
268 struct regcache
*stop_registers
;
270 /* Nonzero after stop if current stack frame should be printed. */
272 static int stop_print_frame
;
274 static struct breakpoint
*step_resume_breakpoint
= NULL
;
276 /* This is a cached copy of the pid/waitstatus of the last event
277 returned by target_wait()/deprecated_target_wait_hook(). This
278 information is returned by get_last_target_status(). */
279 static ptid_t target_last_wait_ptid
;
280 static struct target_waitstatus target_last_waitstatus
;
282 /* This is used to remember when a fork, vfork or exec event
283 was caught by a catchpoint, and thus the event is to be
284 followed at the next resume of the inferior, and not
288 enum target_waitkind kind
;
295 char *execd_pathname
;
299 static const char follow_fork_mode_child
[] = "child";
300 static const char follow_fork_mode_parent
[] = "parent";
302 static const char *follow_fork_mode_kind_names
[] = {
303 follow_fork_mode_child
,
304 follow_fork_mode_parent
,
308 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
310 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
311 struct cmd_list_element
*c
, const char *value
)
313 fprintf_filtered (file
, _("\
314 Debugger response to a program call of fork or vfork is \"%s\".\n"),
322 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
324 return target_follow_fork (follow_child
);
328 follow_inferior_reset_breakpoints (void)
330 /* Was there a step_resume breakpoint? (There was if the user
331 did a "next" at the fork() call.) If so, explicitly reset its
334 step_resumes are a form of bp that are made to be per-thread.
335 Since we created the step_resume bp when the parent process
336 was being debugged, and now are switching to the child process,
337 from the breakpoint package's viewpoint, that's a switch of
338 "threads". We must update the bp's notion of which thread
339 it is for, or it'll be ignored when it triggers. */
341 if (step_resume_breakpoint
)
342 breakpoint_re_set_thread (step_resume_breakpoint
);
344 /* Reinsert all breakpoints in the child. The user may have set
345 breakpoints after catching the fork, in which case those
346 were never set in the child, but only in the parent. This makes
347 sure the inserted breakpoints match the breakpoint list. */
349 breakpoint_re_set ();
350 insert_breakpoints ();
353 /* EXECD_PATHNAME is assumed to be non-NULL. */
356 follow_exec (int pid
, char *execd_pathname
)
359 struct target_ops
*tgt
;
361 /* This is an exec event that we actually wish to pay attention to.
362 Refresh our symbol table to the newly exec'd program, remove any
365 If there are breakpoints, they aren't really inserted now,
366 since the exec() transformed our inferior into a fresh set
369 We want to preserve symbolic breakpoints on the list, since
370 we have hopes that they can be reset after the new a.out's
371 symbol table is read.
373 However, any "raw" breakpoints must be removed from the list
374 (e.g., the solib bp's), since their address is probably invalid
377 And, we DON'T want to call delete_breakpoints() here, since
378 that may write the bp's "shadow contents" (the instruction
379 value that was overwritten witha TRAP instruction). Since
380 we now have a new a.out, those shadow contents aren't valid. */
381 update_breakpoints_after_exec ();
383 /* If there was one, it's gone now. We cannot truly step-to-next
384 statement through an exec(). */
385 step_resume_breakpoint
= NULL
;
386 step_range_start
= 0;
389 /* What is this a.out's name? */
390 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
392 /* We've followed the inferior through an exec. Therefore, the
393 inferior has essentially been killed & reborn. */
395 gdb_flush (gdb_stdout
);
396 generic_mourn_inferior ();
397 /* Because mourn_inferior resets inferior_ptid. */
398 inferior_ptid
= pid_to_ptid (saved_pid
);
400 if (gdb_sysroot
&& *gdb_sysroot
)
402 char *name
= alloca (strlen (gdb_sysroot
)
403 + strlen (execd_pathname
)
405 strcpy (name
, gdb_sysroot
);
406 strcat (name
, execd_pathname
);
407 execd_pathname
= name
;
410 /* That a.out is now the one to use. */
411 exec_file_attach (execd_pathname
, 0);
413 /* And also is where symbols can be found. */
414 symbol_file_add_main (execd_pathname
, 0);
416 /* Reset the shared library package. This ensures that we get
417 a shlib event when the child reaches "_start", at which point
418 the dld will have had a chance to initialize the child. */
419 no_shared_libraries (NULL
, 0);
420 #ifdef SOLIB_CREATE_INFERIOR_HOOK
421 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
423 solib_create_inferior_hook ();
426 /* Reinsert all breakpoints. (Those which were symbolic have
427 been reset to the proper address in the new a.out, thanks
428 to symbol_file_command...) */
429 insert_breakpoints ();
431 /* The next resume of this inferior should bring it to the shlib
432 startup breakpoints. (If the user had also set bp's on
433 "main" from the old (parent) process, then they'll auto-
434 matically get reset there in the new process.) */
437 /* Non-zero if we just simulating a single-step. This is needed
438 because we cannot remove the breakpoints in the inferior process
439 until after the `wait' in `wait_for_inferior'. */
440 static int singlestep_breakpoints_inserted_p
= 0;
442 /* The thread we inserted single-step breakpoints for. */
443 static ptid_t singlestep_ptid
;
445 /* PC when we started this single-step. */
446 static CORE_ADDR singlestep_pc
;
448 /* If another thread hit the singlestep breakpoint, we save the original
449 thread here so that we can resume single-stepping it later. */
450 static ptid_t saved_singlestep_ptid
;
451 static int stepping_past_singlestep_breakpoint
;
453 /* If not equal to null_ptid, this means that after stepping over breakpoint
454 is finished, we need to switch to deferred_step_ptid, and step it.
456 The use case is when one thread has hit a breakpoint, and then the user
457 has switched to another thread and issued 'step'. We need to step over
458 breakpoint in the thread which hit the breakpoint, but then continue
459 stepping the thread user has selected. */
460 static ptid_t deferred_step_ptid
;
463 /* Things to clean up if we QUIT out of resume (). */
465 resume_cleanups (void *ignore
)
470 static const char schedlock_off
[] = "off";
471 static const char schedlock_on
[] = "on";
472 static const char schedlock_step
[] = "step";
473 static const char *scheduler_enums
[] = {
479 static const char *scheduler_mode
= schedlock_off
;
481 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
482 struct cmd_list_element
*c
, const char *value
)
484 fprintf_filtered (file
, _("\
485 Mode for locking scheduler during execution is \"%s\".\n"),
490 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
492 if (!target_can_lock_scheduler
)
494 scheduler_mode
= schedlock_off
;
495 error (_("Target '%s' cannot support this command."), target_shortname
);
500 /* Resume the inferior, but allow a QUIT. This is useful if the user
501 wants to interrupt some lengthy single-stepping operation
502 (for child processes, the SIGINT goes to the inferior, and so
503 we get a SIGINT random_signal, but for remote debugging and perhaps
504 other targets, that's not true).
506 STEP nonzero if we should step (zero to continue instead).
507 SIG is the signal to give the inferior (zero for none). */
509 resume (int step
, enum target_signal sig
)
511 int should_resume
= 1;
512 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
516 fprintf_unfiltered (gdb_stdlog
, "infrun: resume (step=%d, signal=%d)\n",
519 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
522 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
523 over an instruction that causes a page fault without triggering
524 a hardware watchpoint. The kernel properly notices that it shouldn't
525 stop, because the hardware watchpoint is not triggered, but it forgets
526 the step request and continues the program normally.
527 Work around the problem by removing hardware watchpoints if a step is
528 requested, GDB will check for a hardware watchpoint trigger after the
530 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
531 remove_hw_watchpoints ();
534 /* Normally, by the time we reach `resume', the breakpoints are either
535 removed or inserted, as appropriate. The exception is if we're sitting
536 at a permanent breakpoint; we need to step over it, but permanent
537 breakpoints can't be removed. So we have to test for it here. */
538 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
540 if (gdbarch_skip_permanent_breakpoint_p (current_gdbarch
))
541 gdbarch_skip_permanent_breakpoint (current_gdbarch
,
542 get_current_regcache ());
545 The program is stopped at a permanent breakpoint, but GDB does not know\n\
546 how to step past a permanent breakpoint on this architecture. Try using\n\
547 a command like `return' or `jump' to continue execution."));
550 if (step
&& gdbarch_software_single_step_p (current_gdbarch
))
552 /* Do it the hard way, w/temp breakpoints */
553 if (gdbarch_software_single_step (current_gdbarch
, get_current_frame ()))
555 /* ...and don't ask hardware to do it. */
557 /* and do not pull these breakpoints until after a `wait' in
558 `wait_for_inferior' */
559 singlestep_breakpoints_inserted_p
= 1;
560 singlestep_ptid
= inferior_ptid
;
561 singlestep_pc
= read_pc ();
565 /* If there were any forks/vforks/execs that were caught and are
566 now to be followed, then do so. */
567 switch (pending_follow
.kind
)
569 case TARGET_WAITKIND_FORKED
:
570 case TARGET_WAITKIND_VFORKED
:
571 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
576 case TARGET_WAITKIND_EXECD
:
577 /* follow_exec is called as soon as the exec event is seen. */
578 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
585 /* Install inferior's terminal modes. */
586 target_terminal_inferior ();
592 resume_ptid
= RESUME_ALL
; /* Default */
594 /* If STEP is set, it's a request to use hardware stepping
595 facilities. But in that case, we should never
596 use singlestep breakpoint. */
597 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
599 if (singlestep_breakpoints_inserted_p
600 && stepping_past_singlestep_breakpoint
)
602 /* The situation here is as follows. In thread T1 we wanted to
603 single-step. Lacking hardware single-stepping we've
604 set breakpoint at the PC of the next instruction -- call it
605 P. After resuming, we've hit that breakpoint in thread T2.
606 Now we've removed original breakpoint, inserted breakpoint
607 at P+1, and try to step to advance T2 past breakpoint.
608 We need to step only T2, as if T1 is allowed to freely run,
609 it can run past P, and if other threads are allowed to run,
610 they can hit breakpoint at P+1, and nested hits of single-step
611 breakpoints is not something we'd want -- that's complicated
612 to support, and has no value. */
613 resume_ptid
= inferior_ptid
;
616 if ((step
|| singlestep_breakpoints_inserted_p
)
617 && stepping_over_breakpoint
)
619 /* We're allowing a thread to run past a breakpoint it has
620 hit, by single-stepping the thread with the breakpoint
621 removed. In which case, we need to single-step only this
622 thread, and keep others stopped, as they can miss this
623 breakpoint if allowed to run.
625 The current code actually removes all breakpoints when
626 doing this, not just the one being stepped over, so if we
627 let other threads run, we can actually miss any
628 breakpoint, not just the one at PC. */
629 resume_ptid
= inferior_ptid
;
632 if ((scheduler_mode
== schedlock_on
)
633 || (scheduler_mode
== schedlock_step
634 && (step
|| singlestep_breakpoints_inserted_p
)))
636 /* User-settable 'scheduler' mode requires solo thread resume. */
637 resume_ptid
= inferior_ptid
;
640 if (gdbarch_cannot_step_breakpoint (current_gdbarch
))
642 /* Most targets can step a breakpoint instruction, thus
643 executing it normally. But if this one cannot, just
644 continue and we will hit it anyway. */
645 if (step
&& breakpoint_inserted_here_p (read_pc ()))
648 target_resume (resume_ptid
, step
, sig
);
651 discard_cleanups (old_cleanups
);
655 /* Clear out all variables saying what to do when inferior is continued.
656 First do this, then set the ones you want, then call `proceed'. */
659 clear_proceed_status (void)
661 stepping_over_breakpoint
= 0;
662 step_range_start
= 0;
664 step_frame_id
= null_frame_id
;
665 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
667 stop_soon
= NO_STOP_QUIETLY
;
668 proceed_to_finish
= 0;
669 breakpoint_proceeded
= 1; /* We're about to proceed... */
673 regcache_xfree (stop_registers
);
674 stop_registers
= NULL
;
677 /* Discard any remaining commands or status from previous stop. */
678 bpstat_clear (&stop_bpstat
);
681 /* This should be suitable for any targets that support threads. */
684 prepare_to_proceed (int step
)
687 struct target_waitstatus wait_status
;
689 /* Get the last target status returned by target_wait(). */
690 get_last_target_status (&wait_ptid
, &wait_status
);
692 /* Make sure we were stopped at a breakpoint. */
693 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
694 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
699 /* Switched over from WAIT_PID. */
700 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
701 && !ptid_equal (inferior_ptid
, wait_ptid
)
702 && breakpoint_here_p (read_pc_pid (wait_ptid
)))
704 /* If stepping, remember current thread to switch back to. */
707 deferred_step_ptid
= inferior_ptid
;
710 /* Switch back to WAIT_PID thread. */
711 switch_to_thread (wait_ptid
);
713 /* We return 1 to indicate that there is a breakpoint here,
714 so we need to step over it before continuing to avoid
715 hitting it straight away. */
722 /* Record the pc of the program the last time it stopped. This is
723 just used internally by wait_for_inferior, but need to be preserved
724 over calls to it and cleared when the inferior is started. */
725 static CORE_ADDR prev_pc
;
727 /* Basic routine for continuing the program in various fashions.
729 ADDR is the address to resume at, or -1 for resume where stopped.
730 SIGGNAL is the signal to give it, or 0 for none,
731 or -1 for act according to how it stopped.
732 STEP is nonzero if should trap after one instruction.
733 -1 means return after that and print nothing.
734 You should probably set various step_... variables
735 before calling here, if you are stepping.
737 You should call clear_proceed_status before calling proceed. */
740 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
745 step_start_function
= find_pc_function (read_pc ());
749 if (addr
== (CORE_ADDR
) -1)
751 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
752 /* There is a breakpoint at the address we will resume at,
753 step one instruction before inserting breakpoints so that
754 we do not stop right away (and report a second hit at this
757 else if (gdbarch_single_step_through_delay_p (current_gdbarch
)
758 && gdbarch_single_step_through_delay (current_gdbarch
,
759 get_current_frame ()))
760 /* We stepped onto an instruction that needs to be stepped
761 again before re-inserting the breakpoint, do so. */
770 fprintf_unfiltered (gdb_stdlog
,
771 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
772 paddr_nz (addr
), siggnal
, step
);
774 /* In a multi-threaded task we may select another thread
775 and then continue or step.
777 But if the old thread was stopped at a breakpoint, it
778 will immediately cause another breakpoint stop without
779 any execution (i.e. it will report a breakpoint hit
780 incorrectly). So we must step over it first.
782 prepare_to_proceed checks the current thread against the thread
783 that reported the most recent event. If a step-over is required
784 it returns TRUE and sets the current thread to the old thread. */
785 if (prepare_to_proceed (step
))
790 /* We will get a trace trap after one instruction.
791 Continue it automatically and insert breakpoints then. */
792 stepping_over_breakpoint
= 1;
793 /* FIXME: if breakpoints are always inserted, we'll trap
794 if trying to single-step over breakpoint. Disable
795 all breakpoints. In future, we'd need to invent some
796 smart way of stepping over breakpoint instruction without
797 hitting breakpoint. */
798 remove_breakpoints ();
801 insert_breakpoints ();
803 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
804 stop_signal
= siggnal
;
805 /* If this signal should not be seen by program,
806 give it zero. Used for debugging signals. */
807 else if (!signal_program
[stop_signal
])
808 stop_signal
= TARGET_SIGNAL_0
;
810 annotate_starting ();
812 /* Make sure that output from GDB appears before output from the
814 gdb_flush (gdb_stdout
);
816 /* Refresh prev_pc value just prior to resuming. This used to be
817 done in stop_stepping, however, setting prev_pc there did not handle
818 scenarios such as inferior function calls or returning from
819 a function via the return command. In those cases, the prev_pc
820 value was not set properly for subsequent commands. The prev_pc value
821 is used to initialize the starting line number in the ecs. With an
822 invalid value, the gdb next command ends up stopping at the position
823 represented by the next line table entry past our start position.
824 On platforms that generate one line table entry per line, this
825 is not a problem. However, on the ia64, the compiler generates
826 extraneous line table entries that do not increase the line number.
827 When we issue the gdb next command on the ia64 after an inferior call
828 or a return command, we often end up a few instructions forward, still
829 within the original line we started.
831 An attempt was made to have init_execution_control_state () refresh
832 the prev_pc value before calculating the line number. This approach
833 did not work because on platforms that use ptrace, the pc register
834 cannot be read unless the inferior is stopped. At that point, we
835 are not guaranteed the inferior is stopped and so the read_pc ()
836 call can fail. Setting the prev_pc value here ensures the value is
837 updated correctly when the inferior is stopped. */
838 prev_pc
= read_pc ();
840 /* Resume inferior. */
841 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
843 /* Wait for it to stop (if not standalone)
844 and in any case decode why it stopped, and act accordingly. */
845 /* Do this only if we are not using the event loop, or if the target
846 does not support asynchronous execution. */
847 if (!target_can_async_p ())
849 wait_for_inferior (0);
855 /* Start remote-debugging of a machine over a serial link. */
858 start_remote (int from_tty
)
861 init_wait_for_inferior ();
862 stop_soon
= STOP_QUIETLY_REMOTE
;
863 stepping_over_breakpoint
= 0;
865 /* Always go on waiting for the target, regardless of the mode. */
866 /* FIXME: cagney/1999-09-23: At present it isn't possible to
867 indicate to wait_for_inferior that a target should timeout if
868 nothing is returned (instead of just blocking). Because of this,
869 targets expecting an immediate response need to, internally, set
870 things up so that the target_wait() is forced to eventually
872 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
873 differentiate to its caller what the state of the target is after
874 the initial open has been performed. Here we're assuming that
875 the target has stopped. It should be possible to eventually have
876 target_open() return to the caller an indication that the target
877 is currently running and GDB state should be set to the same as
879 wait_for_inferior (0);
881 /* Now that the inferior has stopped, do any bookkeeping like
882 loading shared libraries. We want to do this before normal_stop,
883 so that the displayed frame is up to date. */
884 post_create_inferior (¤t_target
, from_tty
);
889 /* Initialize static vars when a new inferior begins. */
892 init_wait_for_inferior (void)
894 /* These are meaningless until the first time through wait_for_inferior. */
897 breakpoint_init_inferior (inf_starting
);
899 /* Don't confuse first call to proceed(). */
900 stop_signal
= TARGET_SIGNAL_0
;
902 /* The first resume is not following a fork/vfork/exec. */
903 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
905 clear_proceed_status ();
907 stepping_past_singlestep_breakpoint
= 0;
908 deferred_step_ptid
= null_ptid
;
910 target_last_wait_ptid
= minus_one_ptid
;
913 /* This enum encodes possible reasons for doing a target_wait, so that
914 wfi can call target_wait in one place. (Ultimately the call will be
915 moved out of the infinite loop entirely.) */
919 infwait_normal_state
,
920 infwait_thread_hop_state
,
921 infwait_step_watch_state
,
922 infwait_nonstep_watch_state
925 /* Why did the inferior stop? Used to print the appropriate messages
926 to the interface from within handle_inferior_event(). */
927 enum inferior_stop_reason
929 /* Step, next, nexti, stepi finished. */
931 /* Inferior terminated by signal. */
933 /* Inferior exited. */
935 /* Inferior received signal, and user asked to be notified. */
939 /* This structure contains what used to be local variables in
940 wait_for_inferior. Probably many of them can return to being
941 locals in handle_inferior_event. */
943 struct execution_control_state
945 struct target_waitstatus ws
;
946 struct target_waitstatus
*wp
;
947 /* Should we step over breakpoint next time keep_going
949 int stepping_over_breakpoint
;
951 CORE_ADDR stop_func_start
;
952 CORE_ADDR stop_func_end
;
953 char *stop_func_name
;
954 struct symtab_and_line sal
;
956 struct symtab
*current_symtab
;
957 int handling_longjmp
; /* FIXME */
959 ptid_t saved_inferior_ptid
;
960 int step_after_step_resume_breakpoint
;
961 int stepping_through_solib_after_catch
;
962 bpstat stepping_through_solib_catchpoints
;
963 int new_thread_event
;
964 struct target_waitstatus tmpstatus
;
965 enum infwait_states infwait_state
;
970 void init_execution_control_state (struct execution_control_state
*ecs
);
972 void handle_inferior_event (struct execution_control_state
*ecs
);
974 static void step_into_function (struct execution_control_state
*ecs
);
975 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
976 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
977 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
978 struct frame_id sr_id
);
979 static void stop_stepping (struct execution_control_state
*ecs
);
980 static void prepare_to_wait (struct execution_control_state
*ecs
);
981 static void keep_going (struct execution_control_state
*ecs
);
982 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
985 /* Wait for control to return from inferior to debugger.
987 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
988 as if they were SIGTRAP signals. This can be useful during
989 the startup sequence on some targets such as HP/UX, where
990 we receive an EXEC event instead of the expected SIGTRAP.
992 If inferior gets a signal, we may decide to start it up again
993 instead of returning. That is why there is a loop in this function.
994 When this function actually returns it means the inferior
995 should be left stopped and GDB should read more commands. */
998 wait_for_inferior (int treat_exec_as_sigtrap
)
1000 struct cleanup
*old_cleanups
;
1001 struct execution_control_state ecss
;
1002 struct execution_control_state
*ecs
;
1006 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1007 treat_exec_as_sigtrap
);
1009 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
1010 &step_resume_breakpoint
);
1012 /* wfi still stays in a loop, so it's OK just to take the address of
1013 a local to get the ecs pointer. */
1016 /* Fill in with reasonable starting values. */
1017 init_execution_control_state (ecs
);
1019 /* We'll update this if & when we switch to a new thread. */
1020 previous_inferior_ptid
= inferior_ptid
;
1022 overlay_cache_invalid
= 1;
1024 /* We have to invalidate the registers BEFORE calling target_wait
1025 because they can be loaded from the target while in target_wait.
1026 This makes remote debugging a bit more efficient for those
1027 targets that provide critical registers as part of their normal
1028 status mechanism. */
1030 registers_changed ();
1034 if (deprecated_target_wait_hook
)
1035 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1037 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1039 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
1041 xfree (ecs
->ws
.value
.execd_pathname
);
1042 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1043 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
1046 /* Now figure out what to do with the result of the result. */
1047 handle_inferior_event (ecs
);
1049 if (!ecs
->wait_some_more
)
1052 do_cleanups (old_cleanups
);
1055 /* Asynchronous version of wait_for_inferior. It is called by the
1056 event loop whenever a change of state is detected on the file
1057 descriptor corresponding to the target. It can be called more than
1058 once to complete a single execution command. In such cases we need
1059 to keep the state in a global variable ASYNC_ECSS. If it is the
1060 last time that this function is called for a single execution
1061 command, then report to the user that the inferior has stopped, and
1062 do the necessary cleanups. */
1064 struct execution_control_state async_ecss
;
1065 struct execution_control_state
*async_ecs
;
1068 fetch_inferior_event (void *client_data
)
1070 static struct cleanup
*old_cleanups
;
1072 async_ecs
= &async_ecss
;
1074 if (!async_ecs
->wait_some_more
)
1076 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1077 &step_resume_breakpoint
);
1079 /* Fill in with reasonable starting values. */
1080 init_execution_control_state (async_ecs
);
1082 /* We'll update this if & when we switch to a new thread. */
1083 previous_inferior_ptid
= inferior_ptid
;
1085 overlay_cache_invalid
= 1;
1087 /* We have to invalidate the registers BEFORE calling target_wait
1088 because they can be loaded from the target while in target_wait.
1089 This makes remote debugging a bit more efficient for those
1090 targets that provide critical registers as part of their normal
1091 status mechanism. */
1093 registers_changed ();
1096 if (deprecated_target_wait_hook
)
1098 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1100 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1102 /* Now figure out what to do with the result of the result. */
1103 handle_inferior_event (async_ecs
);
1105 if (!async_ecs
->wait_some_more
)
1107 /* Do only the cleanups that have been added by this
1108 function. Let the continuations for the commands do the rest,
1109 if there are any. */
1110 do_exec_cleanups (old_cleanups
);
1112 if (step_multi
&& stop_step
)
1113 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1115 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1119 /* Prepare an execution control state for looping through a
1120 wait_for_inferior-type loop. */
1123 init_execution_control_state (struct execution_control_state
*ecs
)
1125 ecs
->stepping_over_breakpoint
= 0;
1126 ecs
->random_signal
= 0;
1127 ecs
->step_after_step_resume_breakpoint
= 0;
1128 ecs
->handling_longjmp
= 0; /* FIXME */
1129 ecs
->stepping_through_solib_after_catch
= 0;
1130 ecs
->stepping_through_solib_catchpoints
= NULL
;
1131 ecs
->sal
= find_pc_line (prev_pc
, 0);
1132 ecs
->current_line
= ecs
->sal
.line
;
1133 ecs
->current_symtab
= ecs
->sal
.symtab
;
1134 ecs
->infwait_state
= infwait_normal_state
;
1135 ecs
->waiton_ptid
= pid_to_ptid (-1);
1136 ecs
->wp
= &(ecs
->ws
);
1139 /* Return the cached copy of the last pid/waitstatus returned by
1140 target_wait()/deprecated_target_wait_hook(). The data is actually
1141 cached by handle_inferior_event(), which gets called immediately
1142 after target_wait()/deprecated_target_wait_hook(). */
1145 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1147 *ptidp
= target_last_wait_ptid
;
1148 *status
= target_last_waitstatus
;
1152 nullify_last_target_wait_ptid (void)
1154 target_last_wait_ptid
= minus_one_ptid
;
1157 /* Switch thread contexts, maintaining "infrun state". */
1160 context_switch (struct execution_control_state
*ecs
)
1162 /* Caution: it may happen that the new thread (or the old one!)
1163 is not in the thread list. In this case we must not attempt
1164 to "switch context", or we run the risk that our context may
1165 be lost. This may happen as a result of the target module
1166 mishandling thread creation. */
1170 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
1171 target_pid_to_str (inferior_ptid
));
1172 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
1173 target_pid_to_str (ecs
->ptid
));
1176 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1177 { /* Perform infrun state context switch: */
1178 /* Save infrun state for the old thread. */
1179 save_infrun_state (inferior_ptid
, prev_pc
,
1180 stepping_over_breakpoint
, step_resume_breakpoint
,
1182 step_range_end
, &step_frame_id
,
1183 ecs
->handling_longjmp
, ecs
->stepping_over_breakpoint
,
1184 ecs
->stepping_through_solib_after_catch
,
1185 ecs
->stepping_through_solib_catchpoints
,
1186 ecs
->current_line
, ecs
->current_symtab
);
1188 /* Load infrun state for the new thread. */
1189 load_infrun_state (ecs
->ptid
, &prev_pc
,
1190 &stepping_over_breakpoint
, &step_resume_breakpoint
,
1192 &step_range_end
, &step_frame_id
,
1193 &ecs
->handling_longjmp
, &ecs
->stepping_over_breakpoint
,
1194 &ecs
->stepping_through_solib_after_catch
,
1195 &ecs
->stepping_through_solib_catchpoints
,
1196 &ecs
->current_line
, &ecs
->current_symtab
);
1199 switch_to_thread (ecs
->ptid
);
1203 adjust_pc_after_break (struct execution_control_state
*ecs
)
1205 CORE_ADDR breakpoint_pc
;
1207 /* If this target does not decrement the PC after breakpoints, then
1208 we have nothing to do. */
1209 if (gdbarch_decr_pc_after_break (current_gdbarch
) == 0)
1212 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1213 we aren't, just return.
1215 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1216 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1217 implemented by software breakpoints should be handled through the normal
1220 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1221 different signals (SIGILL or SIGEMT for instance), but it is less
1222 clear where the PC is pointing afterwards. It may not match
1223 gdbarch_decr_pc_after_break. I don't know any specific target that
1224 generates these signals at breakpoints (the code has been in GDB since at
1225 least 1992) so I can not guess how to handle them here.
1227 In earlier versions of GDB, a target with
1228 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
1229 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
1230 target with both of these set in GDB history, and it seems unlikely to be
1231 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
1233 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1236 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1239 /* Find the location where (if we've hit a breakpoint) the
1240 breakpoint would be. */
1241 breakpoint_pc
= read_pc_pid (ecs
->ptid
) - gdbarch_decr_pc_after_break
1244 /* Check whether there actually is a software breakpoint inserted
1245 at that location. */
1246 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1248 /* When using hardware single-step, a SIGTRAP is reported for both
1249 a completed single-step and a software breakpoint. Need to
1250 differentiate between the two, as the latter needs adjusting
1251 but the former does not.
1253 The SIGTRAP can be due to a completed hardware single-step only if
1254 - we didn't insert software single-step breakpoints
1255 - the thread to be examined is still the current thread
1256 - this thread is currently being stepped
1258 If any of these events did not occur, we must have stopped due
1259 to hitting a software breakpoint, and have to back up to the
1262 As a special case, we could have hardware single-stepped a
1263 software breakpoint. In this case (prev_pc == breakpoint_pc),
1264 we also need to back up to the breakpoint address. */
1266 if (singlestep_breakpoints_inserted_p
1267 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
1268 || !currently_stepping (ecs
)
1269 || prev_pc
== breakpoint_pc
)
1270 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1274 /* Given an execution control state that has been freshly filled in
1275 by an event from the inferior, figure out what it means and take
1276 appropriate action. */
1279 handle_inferior_event (struct execution_control_state
*ecs
)
1281 int sw_single_step_trap_p
= 0;
1282 int stopped_by_watchpoint
;
1283 int stepped_after_stopped_by_watchpoint
= 0;
1285 /* Cache the last pid/waitstatus. */
1286 target_last_wait_ptid
= ecs
->ptid
;
1287 target_last_waitstatus
= *ecs
->wp
;
1289 /* Always clear state belonging to the previous time we stopped. */
1290 stop_stack_dummy
= 0;
1292 adjust_pc_after_break (ecs
);
1294 switch (ecs
->infwait_state
)
1296 case infwait_thread_hop_state
:
1298 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1299 /* Cancel the waiton_ptid. */
1300 ecs
->waiton_ptid
= pid_to_ptid (-1);
1303 case infwait_normal_state
:
1305 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
1308 case infwait_step_watch_state
:
1310 fprintf_unfiltered (gdb_stdlog
,
1311 "infrun: infwait_step_watch_state\n");
1313 stepped_after_stopped_by_watchpoint
= 1;
1316 case infwait_nonstep_watch_state
:
1318 fprintf_unfiltered (gdb_stdlog
,
1319 "infrun: infwait_nonstep_watch_state\n");
1320 insert_breakpoints ();
1322 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1323 handle things like signals arriving and other things happening
1324 in combination correctly? */
1325 stepped_after_stopped_by_watchpoint
= 1;
1329 internal_error (__FILE__
, __LINE__
, _("bad switch"));
1331 ecs
->infwait_state
= infwait_normal_state
;
1333 reinit_frame_cache ();
1335 /* If it's a new process, add it to the thread database */
1337 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1338 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1339 && !in_thread_list (ecs
->ptid
));
1341 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1342 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1343 add_thread (ecs
->ptid
);
1345 switch (ecs
->ws
.kind
)
1347 case TARGET_WAITKIND_LOADED
:
1349 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
1350 /* Ignore gracefully during startup of the inferior, as it might
1351 be the shell which has just loaded some objects, otherwise
1352 add the symbols for the newly loaded objects. Also ignore at
1353 the beginning of an attach or remote session; we will query
1354 the full list of libraries once the connection is
1356 if (stop_soon
== NO_STOP_QUIETLY
)
1358 /* Check for any newly added shared libraries if we're
1359 supposed to be adding them automatically. Switch
1360 terminal for any messages produced by
1361 breakpoint_re_set. */
1362 target_terminal_ours_for_output ();
1363 /* NOTE: cagney/2003-11-25: Make certain that the target
1364 stack's section table is kept up-to-date. Architectures,
1365 (e.g., PPC64), use the section table to perform
1366 operations such as address => section name and hence
1367 require the table to contain all sections (including
1368 those found in shared libraries). */
1369 /* NOTE: cagney/2003-11-25: Pass current_target and not
1370 exec_ops to SOLIB_ADD. This is because current GDB is
1371 only tooled to propagate section_table changes out from
1372 the "current_target" (see target_resize_to_sections), and
1373 not up from the exec stratum. This, of course, isn't
1374 right. "infrun.c" should only interact with the
1375 exec/process stratum, instead relying on the target stack
1376 to propagate relevant changes (stop, section table
1377 changed, ...) up to other layers. */
1379 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1381 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
1383 target_terminal_inferior ();
1385 /* If requested, stop when the dynamic linker notifies
1386 gdb of events. This allows the user to get control
1387 and place breakpoints in initializer routines for
1388 dynamically loaded objects (among other things). */
1389 if (stop_on_solib_events
)
1391 stop_stepping (ecs
);
1395 /* NOTE drow/2007-05-11: This might be a good place to check
1396 for "catch load". */
1399 /* If we are skipping through a shell, or through shared library
1400 loading that we aren't interested in, resume the program. If
1401 we're running the program normally, also resume. But stop if
1402 we're attaching or setting up a remote connection. */
1403 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
1405 /* Loading of shared libraries might have changed breakpoint
1406 addresses. Make sure new breakpoints are inserted. */
1407 if (!breakpoints_always_inserted_mode ())
1408 insert_breakpoints ();
1409 resume (0, TARGET_SIGNAL_0
);
1410 prepare_to_wait (ecs
);
1416 case TARGET_WAITKIND_SPURIOUS
:
1418 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1419 resume (0, TARGET_SIGNAL_0
);
1420 prepare_to_wait (ecs
);
1423 case TARGET_WAITKIND_EXITED
:
1425 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
1426 target_terminal_ours (); /* Must do this before mourn anyway */
1427 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1429 /* Record the exit code in the convenience variable $_exitcode, so
1430 that the user can inspect this again later. */
1431 set_internalvar (lookup_internalvar ("_exitcode"),
1432 value_from_longest (builtin_type_int
,
1433 (LONGEST
) ecs
->ws
.value
.integer
));
1434 gdb_flush (gdb_stdout
);
1435 target_mourn_inferior ();
1436 singlestep_breakpoints_inserted_p
= 0;
1437 stop_print_frame
= 0;
1438 stop_stepping (ecs
);
1441 case TARGET_WAITKIND_SIGNALLED
:
1443 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1444 stop_print_frame
= 0;
1445 stop_signal
= ecs
->ws
.value
.sig
;
1446 target_terminal_ours (); /* Must do this before mourn anyway */
1448 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1449 reach here unless the inferior is dead. However, for years
1450 target_kill() was called here, which hints that fatal signals aren't
1451 really fatal on some systems. If that's true, then some changes
1453 target_mourn_inferior ();
1455 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1456 singlestep_breakpoints_inserted_p
= 0;
1457 stop_stepping (ecs
);
1460 /* The following are the only cases in which we keep going;
1461 the above cases end in a continue or goto. */
1462 case TARGET_WAITKIND_FORKED
:
1463 case TARGET_WAITKIND_VFORKED
:
1465 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
1466 stop_signal
= TARGET_SIGNAL_TRAP
;
1467 pending_follow
.kind
= ecs
->ws
.kind
;
1469 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1470 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1472 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1474 context_switch (ecs
);
1475 reinit_frame_cache ();
1478 stop_pc
= read_pc ();
1480 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1482 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
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 case TARGET_WAITKIND_EXECD
:
1495 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
1496 stop_signal
= TARGET_SIGNAL_TRAP
;
1498 pending_follow
.execd_pathname
=
1499 savestring (ecs
->ws
.value
.execd_pathname
,
1500 strlen (ecs
->ws
.value
.execd_pathname
));
1502 /* This causes the eventpoints and symbol table to be reset. Must
1503 do this now, before trying to determine whether to stop. */
1504 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1505 xfree (pending_follow
.execd_pathname
);
1507 stop_pc
= read_pc_pid (ecs
->ptid
);
1508 ecs
->saved_inferior_ptid
= inferior_ptid
;
1509 inferior_ptid
= ecs
->ptid
;
1511 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1513 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1514 inferior_ptid
= ecs
->saved_inferior_ptid
;
1516 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1518 context_switch (ecs
);
1519 reinit_frame_cache ();
1522 /* If no catchpoint triggered for this, then keep going. */
1523 if (ecs
->random_signal
)
1525 stop_signal
= TARGET_SIGNAL_0
;
1529 goto process_event_stop_test
;
1531 /* Be careful not to try to gather much state about a thread
1532 that's in a syscall. It's frequently a losing proposition. */
1533 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1535 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1536 resume (0, TARGET_SIGNAL_0
);
1537 prepare_to_wait (ecs
);
1540 /* Before examining the threads further, step this thread to
1541 get it entirely out of the syscall. (We get notice of the
1542 event when the thread is just on the verge of exiting a
1543 syscall. Stepping one instruction seems to get it back
1545 case TARGET_WAITKIND_SYSCALL_RETURN
:
1547 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1548 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1549 prepare_to_wait (ecs
);
1552 case TARGET_WAITKIND_STOPPED
:
1554 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
1555 stop_signal
= ecs
->ws
.value
.sig
;
1558 /* We had an event in the inferior, but we are not interested
1559 in handling it at this level. The lower layers have already
1560 done what needs to be done, if anything.
1562 One of the possible circumstances for this is when the
1563 inferior produces output for the console. The inferior has
1564 not stopped, and we are ignoring the event. Another possible
1565 circumstance is any event which the lower level knows will be
1566 reported multiple times without an intervening resume. */
1567 case TARGET_WAITKIND_IGNORE
:
1569 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
1570 prepare_to_wait (ecs
);
1574 /* We may want to consider not doing a resume here in order to give
1575 the user a chance to play with the new thread. It might be good
1576 to make that a user-settable option. */
1578 /* At this point, all threads are stopped (happens automatically in
1579 either the OS or the native code). Therefore we need to continue
1580 all threads in order to make progress. */
1581 if (ecs
->new_thread_event
)
1583 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1584 prepare_to_wait (ecs
);
1588 stop_pc
= read_pc_pid (ecs
->ptid
);
1591 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc
));
1593 if (stepping_past_singlestep_breakpoint
)
1595 gdb_assert (singlestep_breakpoints_inserted_p
);
1596 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1597 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1599 stepping_past_singlestep_breakpoint
= 0;
1601 /* We've either finished single-stepping past the single-step
1602 breakpoint, or stopped for some other reason. It would be nice if
1603 we could tell, but we can't reliably. */
1604 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1607 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
1608 /* Pull the single step breakpoints out of the target. */
1609 remove_single_step_breakpoints ();
1610 singlestep_breakpoints_inserted_p
= 0;
1612 ecs
->random_signal
= 0;
1614 ecs
->ptid
= saved_singlestep_ptid
;
1615 context_switch (ecs
);
1616 if (deprecated_context_hook
)
1617 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1619 resume (1, TARGET_SIGNAL_0
);
1620 prepare_to_wait (ecs
);
1625 stepping_past_singlestep_breakpoint
= 0;
1627 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
1629 /* If we stopped for some other reason than single-stepping, ignore
1630 the fact that we were supposed to switch back. */
1631 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1634 fprintf_unfiltered (gdb_stdlog
,
1635 "infrun: handling deferred step\n");
1637 /* Pull the single step breakpoints out of the target. */
1638 if (singlestep_breakpoints_inserted_p
)
1640 remove_single_step_breakpoints ();
1641 singlestep_breakpoints_inserted_p
= 0;
1644 /* Note: We do not call context_switch at this point, as the
1645 context is already set up for stepping the original thread. */
1646 switch_to_thread (deferred_step_ptid
);
1647 deferred_step_ptid
= null_ptid
;
1648 /* Suppress spurious "Switching to ..." message. */
1649 previous_inferior_ptid
= inferior_ptid
;
1651 resume (1, TARGET_SIGNAL_0
);
1652 prepare_to_wait (ecs
);
1656 deferred_step_ptid
= null_ptid
;
1659 /* See if a thread hit a thread-specific breakpoint that was meant for
1660 another thread. If so, then step that thread past the breakpoint,
1663 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1665 int thread_hop_needed
= 0;
1667 /* Check if a regular breakpoint has been hit before checking
1668 for a potential single step breakpoint. Otherwise, GDB will
1669 not see this breakpoint hit when stepping onto breakpoints. */
1670 if (regular_breakpoint_inserted_here_p (stop_pc
))
1672 ecs
->random_signal
= 0;
1673 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1674 thread_hop_needed
= 1;
1676 else if (singlestep_breakpoints_inserted_p
)
1678 /* We have not context switched yet, so this should be true
1679 no matter which thread hit the singlestep breakpoint. */
1680 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
1682 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
1684 target_pid_to_str (ecs
->ptid
));
1686 ecs
->random_signal
= 0;
1687 /* The call to in_thread_list is necessary because PTIDs sometimes
1688 change when we go from single-threaded to multi-threaded. If
1689 the singlestep_ptid is still in the list, assume that it is
1690 really different from ecs->ptid. */
1691 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1692 && in_thread_list (singlestep_ptid
))
1694 /* If the PC of the thread we were trying to single-step
1695 has changed, discard this event (which we were going
1696 to ignore anyway), and pretend we saw that thread
1697 trap. This prevents us continuously moving the
1698 single-step breakpoint forward, one instruction at a
1699 time. If the PC has changed, then the thread we were
1700 trying to single-step has trapped or been signalled,
1701 but the event has not been reported to GDB yet.
1703 There might be some cases where this loses signal
1704 information, if a signal has arrived at exactly the
1705 same time that the PC changed, but this is the best
1706 we can do with the information available. Perhaps we
1707 should arrange to report all events for all threads
1708 when they stop, or to re-poll the remote looking for
1709 this particular thread (i.e. temporarily enable
1711 if (read_pc_pid (singlestep_ptid
) != singlestep_pc
)
1714 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
1715 " but expected thread advanced also\n");
1717 /* The current context still belongs to
1718 singlestep_ptid. Don't swap here, since that's
1719 the context we want to use. Just fudge our
1720 state and continue. */
1721 ecs
->ptid
= singlestep_ptid
;
1722 stop_pc
= read_pc_pid (ecs
->ptid
);
1727 fprintf_unfiltered (gdb_stdlog
,
1728 "infrun: unexpected thread\n");
1730 thread_hop_needed
= 1;
1731 stepping_past_singlestep_breakpoint
= 1;
1732 saved_singlestep_ptid
= singlestep_ptid
;
1737 if (thread_hop_needed
)
1742 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
1744 /* Saw a breakpoint, but it was hit by the wrong thread.
1747 if (singlestep_breakpoints_inserted_p
)
1749 /* Pull the single step breakpoints out of the target. */
1750 remove_single_step_breakpoints ();
1751 singlestep_breakpoints_inserted_p
= 0;
1754 remove_status
= remove_breakpoints ();
1755 /* Did we fail to remove breakpoints? If so, try
1756 to set the PC past the bp. (There's at least
1757 one situation in which we can fail to remove
1758 the bp's: On HP-UX's that use ttrace, we can't
1759 change the address space of a vforking child
1760 process until the child exits (well, okay, not
1761 then either :-) or execs. */
1762 if (remove_status
!= 0)
1763 error (_("Cannot step over breakpoint hit in wrong thread"));
1766 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1767 context_switch (ecs
);
1768 ecs
->waiton_ptid
= ecs
->ptid
;
1769 ecs
->wp
= &(ecs
->ws
);
1770 ecs
->stepping_over_breakpoint
= 1;
1772 ecs
->infwait_state
= infwait_thread_hop_state
;
1774 registers_changed ();
1778 else if (singlestep_breakpoints_inserted_p
)
1780 sw_single_step_trap_p
= 1;
1781 ecs
->random_signal
= 0;
1785 ecs
->random_signal
= 1;
1787 /* See if something interesting happened to the non-current thread. If
1788 so, then switch to that thread. */
1789 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1792 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
1794 context_switch (ecs
);
1796 if (deprecated_context_hook
)
1797 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1800 if (singlestep_breakpoints_inserted_p
)
1802 /* Pull the single step breakpoints out of the target. */
1803 remove_single_step_breakpoints ();
1804 singlestep_breakpoints_inserted_p
= 0;
1807 if (stepped_after_stopped_by_watchpoint
)
1808 stopped_by_watchpoint
= 0;
1810 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
1812 /* If necessary, step over this watchpoint. We'll be back to display
1814 if (stopped_by_watchpoint
1815 && (HAVE_STEPPABLE_WATCHPOINT
1816 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
1819 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1821 /* At this point, we are stopped at an instruction which has
1822 attempted to write to a piece of memory under control of
1823 a watchpoint. The instruction hasn't actually executed
1824 yet. If we were to evaluate the watchpoint expression
1825 now, we would get the old value, and therefore no change
1826 would seem to have occurred.
1828 In order to make watchpoints work `right', we really need
1829 to complete the memory write, and then evaluate the
1830 watchpoint expression. We do this by single-stepping the
1833 It may not be necessary to disable the watchpoint to stop over
1834 it. For example, the PA can (with some kernel cooperation)
1835 single step over a watchpoint without disabling the watchpoint.
1837 It is far more common to need to disable a watchpoint to step
1838 the inferior over it. If we have non-steppable watchpoints,
1839 we must disable the current watchpoint; it's simplest to
1840 disable all watchpoints and breakpoints. */
1842 if (!HAVE_STEPPABLE_WATCHPOINT
)
1843 remove_breakpoints ();
1844 registers_changed ();
1845 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1846 ecs
->waiton_ptid
= ecs
->ptid
;
1847 if (HAVE_STEPPABLE_WATCHPOINT
)
1848 ecs
->infwait_state
= infwait_step_watch_state
;
1850 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1851 prepare_to_wait (ecs
);
1855 ecs
->stop_func_start
= 0;
1856 ecs
->stop_func_end
= 0;
1857 ecs
->stop_func_name
= 0;
1858 /* Don't care about return value; stop_func_start and stop_func_name
1859 will both be 0 if it doesn't work. */
1860 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1861 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1862 ecs
->stop_func_start
1863 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
1864 ecs
->stepping_over_breakpoint
= 0;
1865 bpstat_clear (&stop_bpstat
);
1867 stop_print_frame
= 1;
1868 ecs
->random_signal
= 0;
1869 stopped_by_random_signal
= 0;
1871 if (stop_signal
== TARGET_SIGNAL_TRAP
1872 && stepping_over_breakpoint
1873 && gdbarch_single_step_through_delay_p (current_gdbarch
)
1874 && currently_stepping (ecs
))
1876 /* We're trying to step off a breakpoint. Turns out that we're
1877 also on an instruction that needs to be stepped multiple
1878 times before it's been fully executing. E.g., architectures
1879 with a delay slot. It needs to be stepped twice, once for
1880 the instruction and once for the delay slot. */
1881 int step_through_delay
1882 = gdbarch_single_step_through_delay (current_gdbarch
,
1883 get_current_frame ());
1884 if (debug_infrun
&& step_through_delay
)
1885 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
1886 if (step_range_end
== 0 && step_through_delay
)
1888 /* The user issued a continue when stopped at a breakpoint.
1889 Set up for another trap and get out of here. */
1890 ecs
->stepping_over_breakpoint
= 1;
1894 else if (step_through_delay
)
1896 /* The user issued a step when stopped at a breakpoint.
1897 Maybe we should stop, maybe we should not - the delay
1898 slot *might* correspond to a line of source. In any
1899 case, don't decide that here, just set
1900 ecs->stepping_over_breakpoint, making sure we
1901 single-step again before breakpoints are re-inserted. */
1902 ecs
->stepping_over_breakpoint
= 1;
1906 /* Look at the cause of the stop, and decide what to do.
1907 The alternatives are:
1908 1) break; to really stop and return to the debugger,
1909 2) drop through to start up again
1910 (set ecs->stepping_over_breakpoint to 1 to single step once)
1911 3) set ecs->random_signal to 1, and the decision between 1 and 2
1912 will be made according to the signal handling tables. */
1914 /* First, distinguish signals caused by the debugger from signals
1915 that have to do with the program's own actions. Note that
1916 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1917 on the operating system version. Here we detect when a SIGILL or
1918 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1919 something similar for SIGSEGV, since a SIGSEGV will be generated
1920 when we're trying to execute a breakpoint instruction on a
1921 non-executable stack. This happens for call dummy breakpoints
1922 for architectures like SPARC that place call dummies on the
1925 if (stop_signal
== TARGET_SIGNAL_TRAP
1926 || (breakpoint_inserted_here_p (stop_pc
)
1927 && (stop_signal
== TARGET_SIGNAL_ILL
1928 || stop_signal
== TARGET_SIGNAL_SEGV
1929 || stop_signal
== TARGET_SIGNAL_EMT
))
1930 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
1931 || stop_soon
== STOP_QUIETLY_REMOTE
)
1933 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1936 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
1937 stop_print_frame
= 0;
1938 stop_stepping (ecs
);
1942 /* This is originated from start_remote(), start_inferior() and
1943 shared libraries hook functions. */
1944 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
1947 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
1948 stop_stepping (ecs
);
1952 /* This originates from attach_command(). We need to overwrite
1953 the stop_signal here, because some kernels don't ignore a
1954 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1955 See more comments in inferior.h. */
1956 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1958 stop_stepping (ecs
);
1959 if (stop_signal
== TARGET_SIGNAL_STOP
)
1960 stop_signal
= TARGET_SIGNAL_0
;
1964 /* See if there is a breakpoint at the current PC. */
1965 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1967 /* Following in case break condition called a
1969 stop_print_frame
= 1;
1971 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1972 at one stage in the past included checks for an inferior
1973 function call's call dummy's return breakpoint. The original
1974 comment, that went with the test, read:
1976 ``End of a stack dummy. Some systems (e.g. Sony news) give
1977 another signal besides SIGTRAP, so check here as well as
1980 If someone ever tries to get get call dummys on a
1981 non-executable stack to work (where the target would stop
1982 with something like a SIGSEGV), then those tests might need
1983 to be re-instated. Given, however, that the tests were only
1984 enabled when momentary breakpoints were not being used, I
1985 suspect that it won't be the case.
1987 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1988 be necessary for call dummies on a non-executable stack on
1991 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1993 = !(bpstat_explains_signal (stop_bpstat
)
1994 || stepping_over_breakpoint
1995 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1998 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1999 if (!ecs
->random_signal
)
2000 stop_signal
= TARGET_SIGNAL_TRAP
;
2004 /* When we reach this point, we've pretty much decided
2005 that the reason for stopping must've been a random
2006 (unexpected) signal. */
2009 ecs
->random_signal
= 1;
2011 process_event_stop_test
:
2012 /* For the program's own signals, act according to
2013 the signal handling tables. */
2015 if (ecs
->random_signal
)
2017 /* Signal not for debugging purposes. */
2021 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
2023 stopped_by_random_signal
= 1;
2025 if (signal_print
[stop_signal
])
2028 target_terminal_ours_for_output ();
2029 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2031 if (signal_stop
[stop_signal
])
2033 stop_stepping (ecs
);
2036 /* If not going to stop, give terminal back
2037 if we took it away. */
2039 target_terminal_inferior ();
2041 /* Clear the signal if it should not be passed. */
2042 if (signal_program
[stop_signal
] == 0)
2043 stop_signal
= TARGET_SIGNAL_0
;
2045 if (prev_pc
== read_pc ()
2046 && stepping_over_breakpoint
2047 && step_resume_breakpoint
== NULL
)
2049 /* We were just starting a new sequence, attempting to
2050 single-step off of a breakpoint and expecting a SIGTRAP.
2051 Intead this signal arrives. This signal will take us out
2052 of the stepping range so GDB needs to remember to, when
2053 the signal handler returns, resume stepping off that
2055 /* To simplify things, "continue" is forced to use the same
2056 code paths as single-step - set a breakpoint at the
2057 signal return address and then, once hit, step off that
2060 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2061 ecs
->step_after_step_resume_breakpoint
= 1;
2066 if (step_range_end
!= 0
2067 && stop_signal
!= TARGET_SIGNAL_0
2068 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
2069 && frame_id_eq (get_frame_id (get_current_frame ()),
2071 && step_resume_breakpoint
== NULL
)
2073 /* The inferior is about to take a signal that will take it
2074 out of the single step range. Set a breakpoint at the
2075 current PC (which is presumably where the signal handler
2076 will eventually return) and then allow the inferior to
2079 Note that this is only needed for a signal delivered
2080 while in the single-step range. Nested signals aren't a
2081 problem as they eventually all return. */
2082 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2087 /* Note: step_resume_breakpoint may be non-NULL. This occures
2088 when either there's a nested signal, or when there's a
2089 pending signal enabled just as the signal handler returns
2090 (leaving the inferior at the step-resume-breakpoint without
2091 actually executing it). Either way continue until the
2092 breakpoint is really hit. */
2097 /* Handle cases caused by hitting a breakpoint. */
2099 CORE_ADDR jmp_buf_pc
;
2100 struct bpstat_what what
;
2102 what
= bpstat_what (stop_bpstat
);
2104 if (what
.call_dummy
)
2106 stop_stack_dummy
= 1;
2109 switch (what
.main_action
)
2111 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2112 /* If we hit the breakpoint at longjmp, disable it for the
2113 duration of this command. Then, install a temporary
2114 breakpoint at the target of the jmp_buf. */
2116 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2117 disable_longjmp_breakpoint ();
2118 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
2119 || !gdbarch_get_longjmp_target (current_gdbarch
,
2120 get_current_frame (), &jmp_buf_pc
))
2126 /* Need to blow away step-resume breakpoint, as it
2127 interferes with us */
2128 if (step_resume_breakpoint
!= NULL
)
2130 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2133 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2134 ecs
->handling_longjmp
= 1; /* FIXME */
2138 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2139 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2141 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2142 disable_longjmp_breakpoint ();
2143 ecs
->handling_longjmp
= 0; /* FIXME */
2144 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2146 /* else fallthrough */
2148 case BPSTAT_WHAT_SINGLE
:
2150 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2151 ecs
->stepping_over_breakpoint
= 1;
2152 /* Still need to check other stuff, at least the case
2153 where we are stepping and step out of the right range. */
2156 case BPSTAT_WHAT_STOP_NOISY
:
2158 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2159 stop_print_frame
= 1;
2161 /* We are about to nuke the step_resume_breakpointt via the
2162 cleanup chain, so no need to worry about it here. */
2164 stop_stepping (ecs
);
2167 case BPSTAT_WHAT_STOP_SILENT
:
2169 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2170 stop_print_frame
= 0;
2172 /* We are about to nuke the step_resume_breakpoin via the
2173 cleanup chain, so no need to worry about it here. */
2175 stop_stepping (ecs
);
2178 case BPSTAT_WHAT_STEP_RESUME
:
2179 /* This proably demands a more elegant solution, but, yeah
2182 This function's use of the simple variable
2183 step_resume_breakpoint doesn't seem to accomodate
2184 simultaneously active step-resume bp's, although the
2185 breakpoint list certainly can.
2187 If we reach here and step_resume_breakpoint is already
2188 NULL, then apparently we have multiple active
2189 step-resume bp's. We'll just delete the breakpoint we
2190 stopped at, and carry on.
2192 Correction: what the code currently does is delete a
2193 step-resume bp, but it makes no effort to ensure that
2194 the one deleted is the one currently stopped at. MVS */
2197 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2199 if (step_resume_breakpoint
== NULL
)
2201 step_resume_breakpoint
=
2202 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2204 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2205 if (ecs
->step_after_step_resume_breakpoint
)
2207 /* Back when the step-resume breakpoint was inserted, we
2208 were trying to single-step off a breakpoint. Go back
2210 ecs
->step_after_step_resume_breakpoint
= 0;
2211 ecs
->stepping_over_breakpoint
= 1;
2217 case BPSTAT_WHAT_CHECK_SHLIBS
:
2218 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2221 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2223 /* Check for any newly added shared libraries if we're
2224 supposed to be adding them automatically. Switch
2225 terminal for any messages produced by
2226 breakpoint_re_set. */
2227 target_terminal_ours_for_output ();
2228 /* NOTE: cagney/2003-11-25: Make certain that the target
2229 stack's section table is kept up-to-date. Architectures,
2230 (e.g., PPC64), use the section table to perform
2231 operations such as address => section name and hence
2232 require the table to contain all sections (including
2233 those found in shared libraries). */
2234 /* NOTE: cagney/2003-11-25: Pass current_target and not
2235 exec_ops to SOLIB_ADD. This is because current GDB is
2236 only tooled to propagate section_table changes out from
2237 the "current_target" (see target_resize_to_sections), and
2238 not up from the exec stratum. This, of course, isn't
2239 right. "infrun.c" should only interact with the
2240 exec/process stratum, instead relying on the target stack
2241 to propagate relevant changes (stop, section table
2242 changed, ...) up to other layers. */
2244 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2246 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2248 target_terminal_inferior ();
2250 /* If requested, stop when the dynamic linker notifies
2251 gdb of events. This allows the user to get control
2252 and place breakpoints in initializer routines for
2253 dynamically loaded objects (among other things). */
2254 if (stop_on_solib_events
|| stop_stack_dummy
)
2256 stop_stepping (ecs
);
2260 /* If we stopped due to an explicit catchpoint, then the
2261 (see above) call to SOLIB_ADD pulled in any symbols
2262 from a newly-loaded library, if appropriate.
2264 We do want the inferior to stop, but not where it is
2265 now, which is in the dynamic linker callback. Rather,
2266 we would like it stop in the user's program, just after
2267 the call that caused this catchpoint to trigger. That
2268 gives the user a more useful vantage from which to
2269 examine their program's state. */
2270 else if (what
.main_action
2271 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2273 /* ??rehrauer: If I could figure out how to get the
2274 right return PC from here, we could just set a temp
2275 breakpoint and resume. I'm not sure we can without
2276 cracking open the dld's shared libraries and sniffing
2277 their unwind tables and text/data ranges, and that's
2278 not a terribly portable notion.
2280 Until that time, we must step the inferior out of the
2281 dld callback, and also out of the dld itself (and any
2282 code or stubs in libdld.sl, such as "shl_load" and
2283 friends) until we reach non-dld code. At that point,
2284 we can stop stepping. */
2285 bpstat_get_triggered_catchpoints (stop_bpstat
,
2287 stepping_through_solib_catchpoints
);
2288 ecs
->stepping_through_solib_after_catch
= 1;
2290 /* Be sure to lift all breakpoints, so the inferior does
2291 actually step past this point... */
2292 ecs
->stepping_over_breakpoint
= 1;
2297 /* We want to step over this breakpoint, then keep going. */
2298 ecs
->stepping_over_breakpoint
= 1;
2304 case BPSTAT_WHAT_LAST
:
2305 /* Not a real code, but listed here to shut up gcc -Wall. */
2307 case BPSTAT_WHAT_KEEP_CHECKING
:
2312 /* We come here if we hit a breakpoint but should not
2313 stop for it. Possibly we also were stepping
2314 and should stop for that. So fall through and
2315 test for stepping. But, if not stepping,
2318 /* Are we stepping to get the inferior out of the dynamic linker's
2319 hook (and possibly the dld itself) after catching a shlib
2321 if (ecs
->stepping_through_solib_after_catch
)
2323 #if defined(SOLIB_ADD)
2324 /* Have we reached our destination? If not, keep going. */
2325 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2328 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2329 ecs
->stepping_over_breakpoint
= 1;
2335 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2336 /* Else, stop and report the catchpoint(s) whose triggering
2337 caused us to begin stepping. */
2338 ecs
->stepping_through_solib_after_catch
= 0;
2339 bpstat_clear (&stop_bpstat
);
2340 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2341 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2342 stop_print_frame
= 1;
2343 stop_stepping (ecs
);
2347 if (step_resume_breakpoint
)
2350 fprintf_unfiltered (gdb_stdlog
,
2351 "infrun: step-resume breakpoint is inserted\n");
2353 /* Having a step-resume breakpoint overrides anything
2354 else having to do with stepping commands until
2355 that breakpoint is reached. */
2360 if (step_range_end
== 0)
2363 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
2364 /* Likewise if we aren't even stepping. */
2369 /* If stepping through a line, keep going if still within it.
2371 Note that step_range_end is the address of the first instruction
2372 beyond the step range, and NOT the address of the last instruction
2374 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2377 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
2378 paddr_nz (step_range_start
),
2379 paddr_nz (step_range_end
));
2384 /* We stepped out of the stepping range. */
2386 /* If we are stepping at the source level and entered the runtime
2387 loader dynamic symbol resolution code, we keep on single stepping
2388 until we exit the run time loader code and reach the callee's
2390 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2391 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2392 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
)
2394 && in_solib_dynsym_resolve_code (stop_pc
)
2398 CORE_ADDR pc_after_resolver
=
2399 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2402 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
2404 if (pc_after_resolver
)
2406 /* Set up a step-resume breakpoint at the address
2407 indicated by SKIP_SOLIB_RESOLVER. */
2408 struct symtab_and_line sr_sal
;
2410 sr_sal
.pc
= pc_after_resolver
;
2412 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2419 if (step_range_end
!= 1
2420 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2421 || step_over_calls
== STEP_OVER_ALL
)
2422 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2425 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
2426 /* The inferior, while doing a "step" or "next", has ended up in
2427 a signal trampoline (either by a signal being delivered or by
2428 the signal handler returning). Just single-step until the
2429 inferior leaves the trampoline (either by calling the handler
2435 /* Check for subroutine calls. The check for the current frame
2436 equalling the step ID is not necessary - the check of the
2437 previous frame's ID is sufficient - but it is a common case and
2438 cheaper than checking the previous frame's ID.
2440 NOTE: frame_id_eq will never report two invalid frame IDs as
2441 being equal, so to get into this block, both the current and
2442 previous frame must have valid frame IDs. */
2443 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
)
2444 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2446 CORE_ADDR real_stop_pc
;
2449 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
2451 if ((step_over_calls
== STEP_OVER_NONE
)
2452 || ((step_range_end
== 1)
2453 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2455 /* I presume that step_over_calls is only 0 when we're
2456 supposed to be stepping at the assembly language level
2457 ("stepi"). Just stop. */
2458 /* Also, maybe we just did a "nexti" inside a prolog, so we
2459 thought it was a subroutine call but it was not. Stop as
2462 print_stop_reason (END_STEPPING_RANGE
, 0);
2463 stop_stepping (ecs
);
2467 if (step_over_calls
== STEP_OVER_ALL
)
2469 /* We're doing a "next", set a breakpoint at callee's return
2470 address (the address at which the caller will
2472 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2477 /* If we are in a function call trampoline (a stub between the
2478 calling routine and the real function), locate the real
2479 function. That's what tells us (a) whether we want to step
2480 into it at all, and (b) what prologue we want to run to the
2481 end of, if we do step into it. */
2482 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
2483 if (real_stop_pc
== 0)
2484 real_stop_pc
= gdbarch_skip_trampoline_code
2485 (current_gdbarch
, get_current_frame (), stop_pc
);
2486 if (real_stop_pc
!= 0)
2487 ecs
->stop_func_start
= real_stop_pc
;
2490 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2491 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
)
2493 in_solib_dynsym_resolve_code (ecs
->stop_func_start
)
2497 struct symtab_and_line sr_sal
;
2499 sr_sal
.pc
= ecs
->stop_func_start
;
2501 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2506 /* If we have line number information for the function we are
2507 thinking of stepping into, step into it.
2509 If there are several symtabs at that PC (e.g. with include
2510 files), just want to know whether *any* of them have line
2511 numbers. find_pc_line handles this. */
2513 struct symtab_and_line tmp_sal
;
2515 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2516 if (tmp_sal
.line
!= 0)
2518 step_into_function (ecs
);
2523 /* If we have no line number and the step-stop-if-no-debug is
2524 set, we stop the step so that the user has a chance to switch
2525 in assembly mode. */
2526 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2529 print_stop_reason (END_STEPPING_RANGE
, 0);
2530 stop_stepping (ecs
);
2534 /* Set a breakpoint at callee's return address (the address at
2535 which the caller will resume). */
2536 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2541 /* If we're in the return path from a shared library trampoline,
2542 we want to proceed through the trampoline when stepping. */
2543 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
2544 stop_pc
, ecs
->stop_func_name
))
2546 /* Determine where this trampoline returns. */
2547 CORE_ADDR real_stop_pc
;
2548 real_stop_pc
= gdbarch_skip_trampoline_code
2549 (current_gdbarch
, get_current_frame (), stop_pc
);
2552 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
2554 /* Only proceed through if we know where it's going. */
2557 /* And put the step-breakpoint there and go until there. */
2558 struct symtab_and_line sr_sal
;
2560 init_sal (&sr_sal
); /* initialize to zeroes */
2561 sr_sal
.pc
= real_stop_pc
;
2562 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2564 /* Do not specify what the fp should be when we stop since
2565 on some machines the prologue is where the new fp value
2567 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2569 /* Restart without fiddling with the step ranges or
2576 ecs
->sal
= find_pc_line (stop_pc
, 0);
2578 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2579 the trampoline processing logic, however, there are some trampolines
2580 that have no names, so we should do trampoline handling first. */
2581 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2582 && ecs
->stop_func_name
== NULL
2583 && ecs
->sal
.line
== 0)
2586 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
2588 /* The inferior just stepped into, or returned to, an
2589 undebuggable function (where there is no debugging information
2590 and no line number corresponding to the address where the
2591 inferior stopped). Since we want to skip this kind of code,
2592 we keep going until the inferior returns from this
2593 function - unless the user has asked us not to (via
2594 set step-mode) or we no longer know how to get back
2595 to the call site. */
2596 if (step_stop_if_no_debug
2597 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2599 /* If we have no line number and the step-stop-if-no-debug
2600 is set, we stop the step so that the user has a chance to
2601 switch in assembly mode. */
2603 print_stop_reason (END_STEPPING_RANGE
, 0);
2604 stop_stepping (ecs
);
2609 /* Set a breakpoint at callee's return address (the address
2610 at which the caller will resume). */
2611 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2617 if (step_range_end
== 1)
2619 /* It is stepi or nexti. We always want to stop stepping after
2622 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
2624 print_stop_reason (END_STEPPING_RANGE
, 0);
2625 stop_stepping (ecs
);
2629 if (ecs
->sal
.line
== 0)
2631 /* We have no line number information. That means to stop
2632 stepping (does this always happen right after one instruction,
2633 when we do "s" in a function with no line numbers,
2634 or can this happen as a result of a return or longjmp?). */
2636 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
2638 print_stop_reason (END_STEPPING_RANGE
, 0);
2639 stop_stepping (ecs
);
2643 if ((stop_pc
== ecs
->sal
.pc
)
2644 && (ecs
->current_line
!= ecs
->sal
.line
2645 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2647 /* We are at the start of a different line. So stop. Note that
2648 we don't stop if we step into the middle of a different line.
2649 That is said to make things like for (;;) statements work
2652 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
2654 print_stop_reason (END_STEPPING_RANGE
, 0);
2655 stop_stepping (ecs
);
2659 /* We aren't done stepping.
2661 Optimize by setting the stepping range to the line.
2662 (We might not be in the original line, but if we entered a
2663 new line in mid-statement, we continue stepping. This makes
2664 things like for(;;) statements work better.) */
2666 step_range_start
= ecs
->sal
.pc
;
2667 step_range_end
= ecs
->sal
.end
;
2668 step_frame_id
= get_frame_id (get_current_frame ());
2669 ecs
->current_line
= ecs
->sal
.line
;
2670 ecs
->current_symtab
= ecs
->sal
.symtab
;
2672 /* In the case where we just stepped out of a function into the
2673 middle of a line of the caller, continue stepping, but
2674 step_frame_id must be modified to current frame */
2676 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2677 generous. It will trigger on things like a step into a frameless
2678 stackless leaf function. I think the logic should instead look
2679 at the unwound frame ID has that should give a more robust
2680 indication of what happened. */
2681 if (step
- ID
== current
- ID
)
2682 still stepping in same function
;
2683 else if (step
- ID
== unwind (current
- ID
))
2684 stepped into a function
;
2686 stepped out of a function
;
2687 /* Of course this assumes that the frame ID unwind code is robust
2688 and we're willing to introduce frame unwind logic into this
2689 function. Fortunately, those days are nearly upon us. */
2692 struct frame_info
*frame
= get_current_frame ();
2693 struct frame_id current_frame
= get_frame_id (frame
);
2694 if (!(frame_id_inner (get_frame_arch (frame
), current_frame
,
2696 step_frame_id
= current_frame
;
2700 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
2704 /* Are we in the middle of stepping? */
2707 currently_stepping (struct execution_control_state
*ecs
)
2709 return ((!ecs
->handling_longjmp
2710 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2711 || stepping_over_breakpoint
))
2712 || ecs
->stepping_through_solib_after_catch
2713 || bpstat_should_step ());
2716 /* Subroutine call with source code we should not step over. Do step
2717 to the first line of code in it. */
2720 step_into_function (struct execution_control_state
*ecs
)
2723 struct symtab_and_line sr_sal
;
2725 s
= find_pc_symtab (stop_pc
);
2726 if (s
&& s
->language
!= language_asm
)
2727 ecs
->stop_func_start
= gdbarch_skip_prologue
2728 (current_gdbarch
, ecs
->stop_func_start
);
2730 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2731 /* Use the step_resume_break to step until the end of the prologue,
2732 even if that involves jumps (as it seems to on the vax under
2734 /* If the prologue ends in the middle of a source line, continue to
2735 the end of that source line (if it is still within the function).
2736 Otherwise, just go to end of prologue. */
2738 && ecs
->sal
.pc
!= ecs
->stop_func_start
2739 && ecs
->sal
.end
< ecs
->stop_func_end
)
2740 ecs
->stop_func_start
= ecs
->sal
.end
;
2742 /* Architectures which require breakpoint adjustment might not be able
2743 to place a breakpoint at the computed address. If so, the test
2744 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2745 ecs->stop_func_start to an address at which a breakpoint may be
2746 legitimately placed.
2748 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2749 made, GDB will enter an infinite loop when stepping through
2750 optimized code consisting of VLIW instructions which contain
2751 subinstructions corresponding to different source lines. On
2752 FR-V, it's not permitted to place a breakpoint on any but the
2753 first subinstruction of a VLIW instruction. When a breakpoint is
2754 set, GDB will adjust the breakpoint address to the beginning of
2755 the VLIW instruction. Thus, we need to make the corresponding
2756 adjustment here when computing the stop address. */
2758 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2760 ecs
->stop_func_start
2761 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2762 ecs
->stop_func_start
);
2765 if (ecs
->stop_func_start
== stop_pc
)
2767 /* We are already there: stop now. */
2769 print_stop_reason (END_STEPPING_RANGE
, 0);
2770 stop_stepping (ecs
);
2775 /* Put the step-breakpoint there and go until there. */
2776 init_sal (&sr_sal
); /* initialize to zeroes */
2777 sr_sal
.pc
= ecs
->stop_func_start
;
2778 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2780 /* Do not specify what the fp should be when we stop since on
2781 some machines the prologue is where the new fp value is
2783 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2785 /* And make sure stepping stops right away then. */
2786 step_range_end
= step_range_start
;
2791 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
2792 This is used to both functions and to skip over code. */
2795 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
2796 struct frame_id sr_id
)
2798 /* There should never be more than one step-resume breakpoint per
2799 thread, so we should never be setting a new
2800 step_resume_breakpoint when one is already active. */
2801 gdb_assert (step_resume_breakpoint
== NULL
);
2804 fprintf_unfiltered (gdb_stdlog
,
2805 "infrun: inserting step-resume breakpoint at 0x%s\n",
2806 paddr_nz (sr_sal
.pc
));
2808 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
2812 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
2813 to skip a potential signal handler.
2815 This is called with the interrupted function's frame. The signal
2816 handler, when it returns, will resume the interrupted function at
2820 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
2822 struct symtab_and_line sr_sal
;
2824 gdb_assert (return_frame
!= NULL
);
2825 init_sal (&sr_sal
); /* initialize to zeros */
2827 sr_sal
.pc
= gdbarch_addr_bits_remove
2828 (current_gdbarch
, get_frame_pc (return_frame
));
2829 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2831 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
2834 /* Similar to insert_step_resume_breakpoint_at_frame, except
2835 but a breakpoint at the previous frame's PC. This is used to
2836 skip a function after stepping into it (for "next" or if the called
2837 function has no debugging information).
2839 The current function has almost always been reached by single
2840 stepping a call or return instruction. NEXT_FRAME belongs to the
2841 current function, and the breakpoint will be set at the caller's
2844 This is a separate function rather than reusing
2845 insert_step_resume_breakpoint_at_frame in order to avoid
2846 get_prev_frame, which may stop prematurely (see the implementation
2847 of frame_unwind_id for an example). */
2850 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
2852 struct symtab_and_line sr_sal
;
2854 /* We shouldn't have gotten here if we don't know where the call site
2856 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
2858 init_sal (&sr_sal
); /* initialize to zeros */
2860 sr_sal
.pc
= gdbarch_addr_bits_remove
2861 (current_gdbarch
, frame_pc_unwind (next_frame
));
2862 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2864 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
2868 stop_stepping (struct execution_control_state
*ecs
)
2871 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
2873 /* Let callers know we don't want to wait for the inferior anymore. */
2874 ecs
->wait_some_more
= 0;
2877 /* This function handles various cases where we need to continue
2878 waiting for the inferior. */
2879 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2882 keep_going (struct execution_control_state
*ecs
)
2884 /* Save the pc before execution, to compare with pc after stop. */
2885 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2887 /* If we did not do break;, it means we should keep running the
2888 inferior and not return to debugger. */
2890 if (stepping_over_breakpoint
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2892 /* We took a signal (which we are supposed to pass through to
2893 the inferior, else we'd have done a break above) and we
2894 haven't yet gotten our trap. Simply continue. */
2895 resume (currently_stepping (ecs
), stop_signal
);
2899 /* Either the trap was not expected, but we are continuing
2900 anyway (the user asked that this signal be passed to the
2903 The signal was SIGTRAP, e.g. it was our signal, but we
2904 decided we should resume from it.
2906 We're going to run this baby now!
2908 Note that insert_breakpoints won't try to re-insert
2909 already inserted breakpoints. Therefore, we don't
2910 care if breakpoints were already inserted, or not. */
2912 if (ecs
->stepping_over_breakpoint
)
2914 remove_breakpoints ();
2918 struct gdb_exception e
;
2919 /* Stop stepping when inserting breakpoints
2921 TRY_CATCH (e
, RETURN_MASK_ERROR
)
2923 insert_breakpoints ();
2927 stop_stepping (ecs
);
2932 stepping_over_breakpoint
= ecs
->stepping_over_breakpoint
;
2934 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2935 specifies that such a signal should be delivered to the
2938 Typically, this would occure when a user is debugging a
2939 target monitor on a simulator: the target monitor sets a
2940 breakpoint; the simulator encounters this break-point and
2941 halts the simulation handing control to GDB; GDB, noteing
2942 that the break-point isn't valid, returns control back to the
2943 simulator; the simulator then delivers the hardware
2944 equivalent of a SIGNAL_TRAP to the program being debugged. */
2946 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2947 stop_signal
= TARGET_SIGNAL_0
;
2950 resume (currently_stepping (ecs
), stop_signal
);
2953 prepare_to_wait (ecs
);
2956 /* This function normally comes after a resume, before
2957 handle_inferior_event exits. It takes care of any last bits of
2958 housekeeping, and sets the all-important wait_some_more flag. */
2961 prepare_to_wait (struct execution_control_state
*ecs
)
2964 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
2965 if (ecs
->infwait_state
== infwait_normal_state
)
2967 overlay_cache_invalid
= 1;
2969 /* We have to invalidate the registers BEFORE calling
2970 target_wait because they can be loaded from the target while
2971 in target_wait. This makes remote debugging a bit more
2972 efficient for those targets that provide critical registers
2973 as part of their normal status mechanism. */
2975 registers_changed ();
2976 ecs
->waiton_ptid
= pid_to_ptid (-1);
2977 ecs
->wp
= &(ecs
->ws
);
2979 /* This is the old end of the while loop. Let everybody know we
2980 want to wait for the inferior some more and get called again
2982 ecs
->wait_some_more
= 1;
2985 /* Print why the inferior has stopped. We always print something when
2986 the inferior exits, or receives a signal. The rest of the cases are
2987 dealt with later on in normal_stop() and print_it_typical(). Ideally
2988 there should be a call to this function from handle_inferior_event()
2989 each time stop_stepping() is called.*/
2991 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2993 switch (stop_reason
)
2995 case END_STEPPING_RANGE
:
2996 /* We are done with a step/next/si/ni command. */
2997 /* For now print nothing. */
2998 /* Print a message only if not in the middle of doing a "step n"
2999 operation for n > 1 */
3000 if (!step_multi
|| !stop_step
)
3001 if (ui_out_is_mi_like_p (uiout
))
3004 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
3007 /* The inferior was terminated by a signal. */
3008 annotate_signalled ();
3009 if (ui_out_is_mi_like_p (uiout
))
3012 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
3013 ui_out_text (uiout
, "\nProgram terminated with signal ");
3014 annotate_signal_name ();
3015 ui_out_field_string (uiout
, "signal-name",
3016 target_signal_to_name (stop_info
));
3017 annotate_signal_name_end ();
3018 ui_out_text (uiout
, ", ");
3019 annotate_signal_string ();
3020 ui_out_field_string (uiout
, "signal-meaning",
3021 target_signal_to_string (stop_info
));
3022 annotate_signal_string_end ();
3023 ui_out_text (uiout
, ".\n");
3024 ui_out_text (uiout
, "The program no longer exists.\n");
3027 /* The inferior program is finished. */
3028 annotate_exited (stop_info
);
3031 if (ui_out_is_mi_like_p (uiout
))
3032 ui_out_field_string (uiout
, "reason",
3033 async_reason_lookup (EXEC_ASYNC_EXITED
));
3034 ui_out_text (uiout
, "\nProgram exited with code ");
3035 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3036 (unsigned int) stop_info
);
3037 ui_out_text (uiout
, ".\n");
3041 if (ui_out_is_mi_like_p (uiout
))
3044 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
3045 ui_out_text (uiout
, "\nProgram exited normally.\n");
3047 /* Support the --return-child-result option. */
3048 return_child_result_value
= stop_info
;
3050 case SIGNAL_RECEIVED
:
3051 /* Signal received. The signal table tells us to print about
3054 ui_out_text (uiout
, "\nProgram received signal ");
3055 annotate_signal_name ();
3056 if (ui_out_is_mi_like_p (uiout
))
3058 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3059 ui_out_field_string (uiout
, "signal-name",
3060 target_signal_to_name (stop_info
));
3061 annotate_signal_name_end ();
3062 ui_out_text (uiout
, ", ");
3063 annotate_signal_string ();
3064 ui_out_field_string (uiout
, "signal-meaning",
3065 target_signal_to_string (stop_info
));
3066 annotate_signal_string_end ();
3067 ui_out_text (uiout
, ".\n");
3070 internal_error (__FILE__
, __LINE__
,
3071 _("print_stop_reason: unrecognized enum value"));
3077 /* Here to return control to GDB when the inferior stops for real.
3078 Print appropriate messages, remove breakpoints, give terminal our modes.
3080 STOP_PRINT_FRAME nonzero means print the executing frame
3081 (pc, function, args, file, line number and line text).
3082 BREAKPOINTS_FAILED nonzero means stop was due to error
3083 attempting to insert breakpoints. */
3088 struct target_waitstatus last
;
3091 get_last_target_status (&last_ptid
, &last
);
3093 /* As with the notification of thread events, we want to delay
3094 notifying the user that we've switched thread context until
3095 the inferior actually stops.
3097 There's no point in saying anything if the inferior has exited.
3098 Note that SIGNALLED here means "exited with a signal", not
3099 "received a signal". */
3100 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3101 && target_has_execution
3102 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3103 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3105 target_terminal_ours_for_output ();
3106 printf_filtered (_("[Switching to %s]\n"),
3107 target_pid_to_str (inferior_ptid
));
3108 previous_inferior_ptid
= inferior_ptid
;
3111 /* NOTE drow/2004-01-17: Is this still necessary? */
3112 /* Make sure that the current_frame's pc is correct. This
3113 is a correction for setting up the frame info before doing
3114 gdbarch_decr_pc_after_break */
3115 if (target_has_execution
)
3116 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3117 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3118 frame code to check for this and sort out any resultant mess.
3119 gdbarch_decr_pc_after_break needs to just go away. */
3120 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3122 if (!breakpoints_always_inserted_mode () && target_has_execution
)
3124 if (remove_breakpoints ())
3126 target_terminal_ours_for_output ();
3127 printf_filtered (_("\
3128 Cannot remove breakpoints because program is no longer writable.\n\
3129 It might be running in another process.\n\
3130 Further execution is probably impossible.\n"));
3134 /* If an auto-display called a function and that got a signal,
3135 delete that auto-display to avoid an infinite recursion. */
3137 if (stopped_by_random_signal
)
3138 disable_current_display ();
3140 /* Don't print a message if in the middle of doing a "step n"
3141 operation for n > 1 */
3142 if (step_multi
&& stop_step
)
3145 target_terminal_ours ();
3147 /* Set the current source location. This will also happen if we
3148 display the frame below, but the current SAL will be incorrect
3149 during a user hook-stop function. */
3150 if (target_has_stack
&& !stop_stack_dummy
)
3151 set_current_sal_from_frame (get_current_frame (), 1);
3153 /* Look up the hook_stop and run it (CLI internally handles problem
3154 of stop_command's pre-hook not existing). */
3156 catch_errors (hook_stop_stub
, stop_command
,
3157 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3159 if (!target_has_stack
)
3165 /* Select innermost stack frame - i.e., current frame is frame 0,
3166 and current location is based on that.
3167 Don't do this on return from a stack dummy routine,
3168 or if the program has exited. */
3170 if (!stop_stack_dummy
)
3172 select_frame (get_current_frame ());
3174 /* Print current location without a level number, if
3175 we have changed functions or hit a breakpoint.
3176 Print source line if we have one.
3177 bpstat_print() contains the logic deciding in detail
3178 what to print, based on the event(s) that just occurred. */
3180 if (stop_print_frame
)
3184 int do_frame_printing
= 1;
3186 bpstat_ret
= bpstat_print (stop_bpstat
);
3190 /* If we had hit a shared library event breakpoint,
3191 bpstat_print would print out this message. If we hit
3192 an OS-level shared library event, do the same
3194 if (last
.kind
== TARGET_WAITKIND_LOADED
)
3196 printf_filtered (_("Stopped due to shared library event\n"));
3197 source_flag
= SRC_LINE
; /* something bogus */
3198 do_frame_printing
= 0;
3202 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3203 (or should) carry around the function and does (or
3204 should) use that when doing a frame comparison. */
3206 && frame_id_eq (step_frame_id
,
3207 get_frame_id (get_current_frame ()))
3208 && step_start_function
== find_pc_function (stop_pc
))
3209 source_flag
= SRC_LINE
; /* finished step, just print source line */
3211 source_flag
= SRC_AND_LOC
; /* print location and source line */
3213 case PRINT_SRC_AND_LOC
:
3214 source_flag
= SRC_AND_LOC
; /* print location and source line */
3216 case PRINT_SRC_ONLY
:
3217 source_flag
= SRC_LINE
;
3220 source_flag
= SRC_LINE
; /* something bogus */
3221 do_frame_printing
= 0;
3224 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3227 if (ui_out_is_mi_like_p (uiout
))
3228 ui_out_field_int (uiout
, "thread-id",
3229 pid_to_thread_id (inferior_ptid
));
3230 /* The behavior of this routine with respect to the source
3232 SRC_LINE: Print only source line
3233 LOCATION: Print only location
3234 SRC_AND_LOC: Print location and source line */
3235 if (do_frame_printing
)
3236 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3238 /* Display the auto-display expressions. */
3243 /* Save the function value return registers, if we care.
3244 We might be about to restore their previous contents. */
3245 if (proceed_to_finish
)
3247 /* This should not be necessary. */
3249 regcache_xfree (stop_registers
);
3251 /* NB: The copy goes through to the target picking up the value of
3252 all the registers. */
3253 stop_registers
= regcache_dup (get_current_regcache ());
3256 if (stop_stack_dummy
)
3258 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3259 ends with a setting of the current frame, so we can use that
3261 frame_pop (get_current_frame ());
3262 /* Set stop_pc to what it was before we called the function.
3263 Can't rely on restore_inferior_status because that only gets
3264 called if we don't stop in the called function. */
3265 stop_pc
= read_pc ();
3266 select_frame (get_current_frame ());
3270 annotate_stopped ();
3271 observer_notify_normal_stop (stop_bpstat
);
3272 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3273 Delete any breakpoint that is to be deleted at the next stop. */
3274 breakpoint_auto_delete (stop_bpstat
);
3278 hook_stop_stub (void *cmd
)
3280 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3285 signal_stop_state (int signo
)
3287 return signal_stop
[signo
];
3291 signal_print_state (int signo
)
3293 return signal_print
[signo
];
3297 signal_pass_state (int signo
)
3299 return signal_program
[signo
];
3303 signal_stop_update (int signo
, int state
)
3305 int ret
= signal_stop
[signo
];
3306 signal_stop
[signo
] = state
;
3311 signal_print_update (int signo
, int state
)
3313 int ret
= signal_print
[signo
];
3314 signal_print
[signo
] = state
;
3319 signal_pass_update (int signo
, int state
)
3321 int ret
= signal_program
[signo
];
3322 signal_program
[signo
] = state
;
3327 sig_print_header (void)
3329 printf_filtered (_("\
3330 Signal Stop\tPrint\tPass to program\tDescription\n"));
3334 sig_print_info (enum target_signal oursig
)
3336 char *name
= target_signal_to_name (oursig
);
3337 int name_padding
= 13 - strlen (name
);
3339 if (name_padding
<= 0)
3342 printf_filtered ("%s", name
);
3343 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3344 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3345 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3346 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3347 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3350 /* Specify how various signals in the inferior should be handled. */
3353 handle_command (char *args
, int from_tty
)
3356 int digits
, wordlen
;
3357 int sigfirst
, signum
, siglast
;
3358 enum target_signal oursig
;
3361 unsigned char *sigs
;
3362 struct cleanup
*old_chain
;
3366 error_no_arg (_("signal to handle"));
3369 /* Allocate and zero an array of flags for which signals to handle. */
3371 nsigs
= (int) TARGET_SIGNAL_LAST
;
3372 sigs
= (unsigned char *) alloca (nsigs
);
3373 memset (sigs
, 0, nsigs
);
3375 /* Break the command line up into args. */
3377 argv
= buildargv (args
);
3382 old_chain
= make_cleanup_freeargv (argv
);
3384 /* Walk through the args, looking for signal oursigs, signal names, and
3385 actions. Signal numbers and signal names may be interspersed with
3386 actions, with the actions being performed for all signals cumulatively
3387 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3389 while (*argv
!= NULL
)
3391 wordlen
= strlen (*argv
);
3392 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3396 sigfirst
= siglast
= -1;
3398 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3400 /* Apply action to all signals except those used by the
3401 debugger. Silently skip those. */
3404 siglast
= nsigs
- 1;
3406 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3408 SET_SIGS (nsigs
, sigs
, signal_stop
);
3409 SET_SIGS (nsigs
, sigs
, signal_print
);
3411 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3413 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3415 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3417 SET_SIGS (nsigs
, sigs
, signal_print
);
3419 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3421 SET_SIGS (nsigs
, sigs
, signal_program
);
3423 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3425 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3427 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3429 SET_SIGS (nsigs
, sigs
, signal_program
);
3431 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3433 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3434 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3436 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3438 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3440 else if (digits
> 0)
3442 /* It is numeric. The numeric signal refers to our own
3443 internal signal numbering from target.h, not to host/target
3444 signal number. This is a feature; users really should be
3445 using symbolic names anyway, and the common ones like
3446 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3448 sigfirst
= siglast
= (int)
3449 target_signal_from_command (atoi (*argv
));
3450 if ((*argv
)[digits
] == '-')
3453 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3455 if (sigfirst
> siglast
)
3457 /* Bet he didn't figure we'd think of this case... */
3465 oursig
= target_signal_from_name (*argv
);
3466 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3468 sigfirst
= siglast
= (int) oursig
;
3472 /* Not a number and not a recognized flag word => complain. */
3473 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
3477 /* If any signal numbers or symbol names were found, set flags for
3478 which signals to apply actions to. */
3480 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3482 switch ((enum target_signal
) signum
)
3484 case TARGET_SIGNAL_TRAP
:
3485 case TARGET_SIGNAL_INT
:
3486 if (!allsigs
&& !sigs
[signum
])
3488 if (query ("%s is used by the debugger.\n\
3489 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3495 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3496 gdb_flush (gdb_stdout
);
3500 case TARGET_SIGNAL_0
:
3501 case TARGET_SIGNAL_DEFAULT
:
3502 case TARGET_SIGNAL_UNKNOWN
:
3503 /* Make sure that "all" doesn't print these. */
3514 target_notice_signals (inferior_ptid
);
3518 /* Show the results. */
3519 sig_print_header ();
3520 for (signum
= 0; signum
< nsigs
; signum
++)
3524 sig_print_info (signum
);
3529 do_cleanups (old_chain
);
3533 xdb_handle_command (char *args
, int from_tty
)
3536 struct cleanup
*old_chain
;
3538 /* Break the command line up into args. */
3540 argv
= buildargv (args
);
3545 old_chain
= make_cleanup_freeargv (argv
);
3546 if (argv
[1] != (char *) NULL
)
3551 bufLen
= strlen (argv
[0]) + 20;
3552 argBuf
= (char *) xmalloc (bufLen
);
3556 enum target_signal oursig
;
3558 oursig
= target_signal_from_name (argv
[0]);
3559 memset (argBuf
, 0, bufLen
);
3560 if (strcmp (argv
[1], "Q") == 0)
3561 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3564 if (strcmp (argv
[1], "s") == 0)
3566 if (!signal_stop
[oursig
])
3567 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3569 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3571 else if (strcmp (argv
[1], "i") == 0)
3573 if (!signal_program
[oursig
])
3574 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3576 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3578 else if (strcmp (argv
[1], "r") == 0)
3580 if (!signal_print
[oursig
])
3581 sprintf (argBuf
, "%s %s", argv
[0], "print");
3583 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3589 handle_command (argBuf
, from_tty
);
3591 printf_filtered (_("Invalid signal handling flag.\n"));
3596 do_cleanups (old_chain
);
3599 /* Print current contents of the tables set by the handle command.
3600 It is possible we should just be printing signals actually used
3601 by the current target (but for things to work right when switching
3602 targets, all signals should be in the signal tables). */
3605 signals_info (char *signum_exp
, int from_tty
)
3607 enum target_signal oursig
;
3608 sig_print_header ();
3612 /* First see if this is a symbol name. */
3613 oursig
= target_signal_from_name (signum_exp
);
3614 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3616 /* No, try numeric. */
3618 target_signal_from_command (parse_and_eval_long (signum_exp
));
3620 sig_print_info (oursig
);
3624 printf_filtered ("\n");
3625 /* These ugly casts brought to you by the native VAX compiler. */
3626 for (oursig
= TARGET_SIGNAL_FIRST
;
3627 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3628 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3632 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3633 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3634 sig_print_info (oursig
);
3637 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3640 struct inferior_status
3642 enum target_signal stop_signal
;
3646 int stop_stack_dummy
;
3647 int stopped_by_random_signal
;
3648 int stepping_over_breakpoint
;
3649 CORE_ADDR step_range_start
;
3650 CORE_ADDR step_range_end
;
3651 struct frame_id step_frame_id
;
3652 enum step_over_calls_kind step_over_calls
;
3653 CORE_ADDR step_resume_break_address
;
3654 int stop_after_trap
;
3657 /* These are here because if call_function_by_hand has written some
3658 registers and then decides to call error(), we better not have changed
3660 struct regcache
*registers
;
3662 /* A frame unique identifier. */
3663 struct frame_id selected_frame_id
;
3665 int breakpoint_proceeded
;
3666 int restore_stack_info
;
3667 int proceed_to_finish
;
3671 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3674 int size
= register_size (current_gdbarch
, regno
);
3675 void *buf
= alloca (size
);
3676 store_signed_integer (buf
, size
, val
);
3677 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3680 /* Save all of the information associated with the inferior<==>gdb
3681 connection. INF_STATUS is a pointer to a "struct inferior_status"
3682 (defined in inferior.h). */
3684 struct inferior_status
*
3685 save_inferior_status (int restore_stack_info
)
3687 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3689 inf_status
->stop_signal
= stop_signal
;
3690 inf_status
->stop_pc
= stop_pc
;
3691 inf_status
->stop_step
= stop_step
;
3692 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3693 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3694 inf_status
->stepping_over_breakpoint
= stepping_over_breakpoint
;
3695 inf_status
->step_range_start
= step_range_start
;
3696 inf_status
->step_range_end
= step_range_end
;
3697 inf_status
->step_frame_id
= step_frame_id
;
3698 inf_status
->step_over_calls
= step_over_calls
;
3699 inf_status
->stop_after_trap
= stop_after_trap
;
3700 inf_status
->stop_soon
= stop_soon
;
3701 /* Save original bpstat chain here; replace it with copy of chain.
3702 If caller's caller is walking the chain, they'll be happier if we
3703 hand them back the original chain when restore_inferior_status is
3705 inf_status
->stop_bpstat
= stop_bpstat
;
3706 stop_bpstat
= bpstat_copy (stop_bpstat
);
3707 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3708 inf_status
->restore_stack_info
= restore_stack_info
;
3709 inf_status
->proceed_to_finish
= proceed_to_finish
;
3711 inf_status
->registers
= regcache_dup (get_current_regcache ());
3713 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
3718 restore_selected_frame (void *args
)
3720 struct frame_id
*fid
= (struct frame_id
*) args
;
3721 struct frame_info
*frame
;
3723 frame
= frame_find_by_id (*fid
);
3725 /* If inf_status->selected_frame_id is NULL, there was no previously
3729 warning (_("Unable to restore previously selected frame."));
3733 select_frame (frame
);
3739 restore_inferior_status (struct inferior_status
*inf_status
)
3741 stop_signal
= inf_status
->stop_signal
;
3742 stop_pc
= inf_status
->stop_pc
;
3743 stop_step
= inf_status
->stop_step
;
3744 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3745 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3746 stepping_over_breakpoint
= inf_status
->stepping_over_breakpoint
;
3747 step_range_start
= inf_status
->step_range_start
;
3748 step_range_end
= inf_status
->step_range_end
;
3749 step_frame_id
= inf_status
->step_frame_id
;
3750 step_over_calls
= inf_status
->step_over_calls
;
3751 stop_after_trap
= inf_status
->stop_after_trap
;
3752 stop_soon
= inf_status
->stop_soon
;
3753 bpstat_clear (&stop_bpstat
);
3754 stop_bpstat
= inf_status
->stop_bpstat
;
3755 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3756 proceed_to_finish
= inf_status
->proceed_to_finish
;
3758 /* The inferior can be gone if the user types "print exit(0)"
3759 (and perhaps other times). */
3760 if (target_has_execution
)
3761 /* NB: The register write goes through to the target. */
3762 regcache_cpy (get_current_regcache (), inf_status
->registers
);
3763 regcache_xfree (inf_status
->registers
);
3765 /* FIXME: If we are being called after stopping in a function which
3766 is called from gdb, we should not be trying to restore the
3767 selected frame; it just prints a spurious error message (The
3768 message is useful, however, in detecting bugs in gdb (like if gdb
3769 clobbers the stack)). In fact, should we be restoring the
3770 inferior status at all in that case? . */
3772 if (target_has_stack
&& inf_status
->restore_stack_info
)
3774 /* The point of catch_errors is that if the stack is clobbered,
3775 walking the stack might encounter a garbage pointer and
3776 error() trying to dereference it. */
3778 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3779 "Unable to restore previously selected frame:\n",
3780 RETURN_MASK_ERROR
) == 0)
3781 /* Error in restoring the selected frame. Select the innermost
3783 select_frame (get_current_frame ());
3791 do_restore_inferior_status_cleanup (void *sts
)
3793 restore_inferior_status (sts
);
3797 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3799 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3803 discard_inferior_status (struct inferior_status
*inf_status
)
3805 /* See save_inferior_status for info on stop_bpstat. */
3806 bpstat_clear (&inf_status
->stop_bpstat
);
3807 regcache_xfree (inf_status
->registers
);
3812 inferior_has_forked (int pid
, int *child_pid
)
3814 struct target_waitstatus last
;
3817 get_last_target_status (&last_ptid
, &last
);
3819 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3822 if (ptid_get_pid (last_ptid
) != pid
)
3825 *child_pid
= last
.value
.related_pid
;
3830 inferior_has_vforked (int pid
, int *child_pid
)
3832 struct target_waitstatus last
;
3835 get_last_target_status (&last_ptid
, &last
);
3837 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3840 if (ptid_get_pid (last_ptid
) != pid
)
3843 *child_pid
= last
.value
.related_pid
;
3848 inferior_has_execd (int pid
, char **execd_pathname
)
3850 struct target_waitstatus last
;
3853 get_last_target_status (&last_ptid
, &last
);
3855 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3858 if (ptid_get_pid (last_ptid
) != pid
)
3861 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3865 /* Oft used ptids */
3867 ptid_t minus_one_ptid
;
3869 /* Create a ptid given the necessary PID, LWP, and TID components. */
3872 ptid_build (int pid
, long lwp
, long tid
)
3882 /* Create a ptid from just a pid. */
3885 pid_to_ptid (int pid
)
3887 return ptid_build (pid
, 0, 0);
3890 /* Fetch the pid (process id) component from a ptid. */
3893 ptid_get_pid (ptid_t ptid
)
3898 /* Fetch the lwp (lightweight process) component from a ptid. */
3901 ptid_get_lwp (ptid_t ptid
)
3906 /* Fetch the tid (thread id) component from a ptid. */
3909 ptid_get_tid (ptid_t ptid
)
3914 /* ptid_equal() is used to test equality of two ptids. */
3917 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3919 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3920 && ptid1
.tid
== ptid2
.tid
);
3923 /* restore_inferior_ptid() will be used by the cleanup machinery
3924 to restore the inferior_ptid value saved in a call to
3925 save_inferior_ptid(). */
3928 restore_inferior_ptid (void *arg
)
3930 ptid_t
*saved_ptid_ptr
= arg
;
3931 inferior_ptid
= *saved_ptid_ptr
;
3935 /* Save the value of inferior_ptid so that it may be restored by a
3936 later call to do_cleanups(). Returns the struct cleanup pointer
3937 needed for later doing the cleanup. */
3940 save_inferior_ptid (void)
3942 ptid_t
*saved_ptid_ptr
;
3944 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3945 *saved_ptid_ptr
= inferior_ptid
;
3946 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3951 _initialize_infrun (void)
3955 struct cmd_list_element
*c
;
3957 add_info ("signals", signals_info
, _("\
3958 What debugger does when program gets various signals.\n\
3959 Specify a signal as argument to print info on that signal only."));
3960 add_info_alias ("handle", "signals", 0);
3962 add_com ("handle", class_run
, handle_command
, _("\
3963 Specify how to handle a signal.\n\
3964 Args are signals and actions to apply to those signals.\n\
3965 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3966 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3967 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3968 The special arg \"all\" is recognized to mean all signals except those\n\
3969 used by the debugger, typically SIGTRAP and SIGINT.\n\
3970 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3971 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3972 Stop means reenter debugger if this signal happens (implies print).\n\
3973 Print means print a message if this signal happens.\n\
3974 Pass means let program see this signal; otherwise program doesn't know.\n\
3975 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3976 Pass and Stop may be combined."));
3979 add_com ("lz", class_info
, signals_info
, _("\
3980 What debugger does when program gets various signals.\n\
3981 Specify a signal as argument to print info on that signal only."));
3982 add_com ("z", class_run
, xdb_handle_command
, _("\
3983 Specify how to handle a signal.\n\
3984 Args are signals and actions to apply to those signals.\n\
3985 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3986 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3987 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3988 The special arg \"all\" is recognized to mean all signals except those\n\
3989 used by the debugger, typically SIGTRAP and SIGINT.\n\
3990 Recognized actions include \"s\" (toggles between stop and nostop), \n\
3991 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3992 nopass), \"Q\" (noprint)\n\
3993 Stop means reenter debugger if this signal happens (implies print).\n\
3994 Print means print a message if this signal happens.\n\
3995 Pass means let program see this signal; otherwise program doesn't know.\n\
3996 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3997 Pass and Stop may be combined."));
4001 stop_command
= add_cmd ("stop", class_obscure
,
4002 not_just_help_class_command
, _("\
4003 There is no `stop' command, but you can set a hook on `stop'.\n\
4004 This allows you to set a list of commands to be run each time execution\n\
4005 of the program stops."), &cmdlist
);
4007 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
4008 Set inferior debugging."), _("\
4009 Show inferior debugging."), _("\
4010 When non-zero, inferior specific debugging is enabled."),
4013 &setdebuglist
, &showdebuglist
);
4015 numsigs
= (int) TARGET_SIGNAL_LAST
;
4016 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4017 signal_print
= (unsigned char *)
4018 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4019 signal_program
= (unsigned char *)
4020 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4021 for (i
= 0; i
< numsigs
; i
++)
4024 signal_print
[i
] = 1;
4025 signal_program
[i
] = 1;
4028 /* Signals caused by debugger's own actions
4029 should not be given to the program afterwards. */
4030 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4031 signal_program
[TARGET_SIGNAL_INT
] = 0;
4033 /* Signals that are not errors should not normally enter the debugger. */
4034 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4035 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4036 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4037 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4038 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4039 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4040 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4041 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4042 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4043 signal_print
[TARGET_SIGNAL_IO
] = 0;
4044 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4045 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4046 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4047 signal_print
[TARGET_SIGNAL_URG
] = 0;
4048 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4049 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4051 /* These signals are used internally by user-level thread
4052 implementations. (See signal(5) on Solaris.) Like the above
4053 signals, a healthy program receives and handles them as part of
4054 its normal operation. */
4055 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4056 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4057 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4058 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4059 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4060 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4062 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
4063 &stop_on_solib_events
, _("\
4064 Set stopping for shared library events."), _("\
4065 Show stopping for shared library events."), _("\
4066 If nonzero, gdb will give control to the user when the dynamic linker\n\
4067 notifies gdb of shared library events. The most common event of interest\n\
4068 to the user would be loading/unloading of a new library."),
4070 show_stop_on_solib_events
,
4071 &setlist
, &showlist
);
4073 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
4074 follow_fork_mode_kind_names
,
4075 &follow_fork_mode_string
, _("\
4076 Set debugger response to a program call of fork or vfork."), _("\
4077 Show debugger response to a program call of fork or vfork."), _("\
4078 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4079 parent - the original process is debugged after a fork\n\
4080 child - the new process is debugged after a fork\n\
4081 The unfollowed process will continue to run.\n\
4082 By default, the debugger will follow the parent process."),
4084 show_follow_fork_mode_string
,
4085 &setlist
, &showlist
);
4087 add_setshow_enum_cmd ("scheduler-locking", class_run
,
4088 scheduler_enums
, &scheduler_mode
, _("\
4089 Set mode for locking scheduler during execution."), _("\
4090 Show mode for locking scheduler during execution."), _("\
4091 off == no locking (threads may preempt at any time)\n\
4092 on == full locking (no thread except the current thread may run)\n\
4093 step == scheduler locked during every single-step operation.\n\
4094 In this mode, no other thread may run during a step command.\n\
4095 Other threads may run while stepping over a function call ('next')."),
4096 set_schedlock_func
, /* traps on target vector */
4097 show_scheduler_mode
,
4098 &setlist
, &showlist
);
4100 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
4101 Set mode of the step operation."), _("\
4102 Show mode of the step operation."), _("\
4103 When set, doing a step over a function without debug line information\n\
4104 will stop at the first instruction of that function. Otherwise, the\n\
4105 function is skipped and the step command stops at a different source line."),
4107 show_step_stop_if_no_debug
,
4108 &setlist
, &showlist
);
4110 /* ptid initializations */
4111 null_ptid
= ptid_build (0, 0, 0);
4112 minus_one_ptid
= ptid_build (-1, 0, 0);
4113 inferior_ptid
= null_ptid
;
4114 target_last_wait_ptid
= minus_one_ptid
;