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 int inferior_ignoring_leading_exec_events
= 0;
87 /* When set, stop the 'step' command if we enter a function which has
88 no line number information. The normal behavior is that we step
89 over such function. */
90 int step_stop_if_no_debug
= 0;
92 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
93 struct cmd_list_element
*c
, const char *value
)
95 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
98 /* In asynchronous mode, but simulating synchronous execution. */
100 int sync_execution
= 0;
102 /* wait_for_inferior and normal_stop use this to notify the user
103 when the inferior stopped in a different thread than it had been
106 static ptid_t previous_inferior_ptid
;
108 /* This is true for configurations that may follow through execl() and
109 similar functions. At present this is only true for HP-UX native. */
111 #ifndef MAY_FOLLOW_EXEC
112 #define MAY_FOLLOW_EXEC (0)
115 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
117 static int debug_infrun
= 0;
119 show_debug_infrun (struct ui_file
*file
, int from_tty
,
120 struct cmd_list_element
*c
, const char *value
)
122 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
125 /* If the program uses ELF-style shared libraries, then calls to
126 functions in shared libraries go through stubs, which live in a
127 table called the PLT (Procedure Linkage Table). The first time the
128 function is called, the stub sends control to the dynamic linker,
129 which looks up the function's real address, patches the stub so
130 that future calls will go directly to the function, and then passes
131 control to the function.
133 If we are stepping at the source level, we don't want to see any of
134 this --- we just want to skip over the stub and the dynamic linker.
135 The simple approach is to single-step until control leaves the
138 However, on some systems (e.g., Red Hat's 5.2 distribution) the
139 dynamic linker calls functions in the shared C library, so you
140 can't tell from the PC alone whether the dynamic linker is still
141 running. In this case, we use a step-resume breakpoint to get us
142 past the dynamic linker, as if we were using "next" to step over a
145 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
146 linker code or not. Normally, this means we single-step. However,
147 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
148 address where we can place a step-resume breakpoint to get past the
149 linker's symbol resolution function.
151 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
152 pretty portable way, by comparing the PC against the address ranges
153 of the dynamic linker's sections.
155 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
156 it depends on internal details of the dynamic linker. It's usually
157 not too hard to figure out where to put a breakpoint, but it
158 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
159 sanity checking. If it can't figure things out, returning zero and
160 getting the (possibly confusing) stepping behavior is better than
161 signalling an error, which will obscure the change in the
164 /* This function returns TRUE if pc is the address of an instruction
165 that lies within the dynamic linker (such as the event hook, or the
168 This function must be used only when a dynamic linker event has
169 been caught, and the inferior is being stepped out of the hook, or
170 undefined results are guaranteed. */
172 #ifndef SOLIB_IN_DYNAMIC_LINKER
173 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
177 /* Convert the #defines into values. This is temporary until wfi control
178 flow is completely sorted out. */
180 #ifndef CANNOT_STEP_HW_WATCHPOINTS
181 #define CANNOT_STEP_HW_WATCHPOINTS 0
183 #undef CANNOT_STEP_HW_WATCHPOINTS
184 #define CANNOT_STEP_HW_WATCHPOINTS 1
187 /* Tables of how to react to signals; the user sets them. */
189 static unsigned char *signal_stop
;
190 static unsigned char *signal_print
;
191 static unsigned char *signal_program
;
193 #define SET_SIGS(nsigs,sigs,flags) \
195 int signum = (nsigs); \
196 while (signum-- > 0) \
197 if ((sigs)[signum]) \
198 (flags)[signum] = 1; \
201 #define UNSET_SIGS(nsigs,sigs,flags) \
203 int signum = (nsigs); \
204 while (signum-- > 0) \
205 if ((sigs)[signum]) \
206 (flags)[signum] = 0; \
209 /* Value to pass to target_resume() to cause all threads to resume */
211 #define RESUME_ALL (pid_to_ptid (-1))
213 /* Command list pointer for the "stop" placeholder. */
215 static struct cmd_list_element
*stop_command
;
217 /* Function inferior was in as of last step command. */
219 static struct symbol
*step_start_function
;
221 /* Nonzero if we are presently stepping over a breakpoint.
223 If we hit a breakpoint or watchpoint, and then continue,
224 we need to single step the current thread with breakpoints
225 disabled, to avoid hitting the same breakpoint or
226 watchpoint again. And we should step just a single
227 thread and keep other threads stopped, so that
228 other threads don't miss breakpoints while they are removed.
230 So, this variable simultaneously means that we need to single
231 step the current thread, keep other threads stopped, and that
232 breakpoints should be removed while we step.
234 This variable is set either:
235 - in proceed, when we resume inferior on user's explicit request
236 - in keep_going, if handle_inferior_event decides we need to
237 step over breakpoint.
239 The variable is cleared in clear_proceed_status, called every
240 time before we call proceed. The proceed calls wait_for_inferior,
241 which calls handle_inferior_event in a loop, and until
242 wait_for_inferior exits, this variable is changed only by keep_going. */
244 static int stepping_over_breakpoint
;
246 /* Nonzero if we want to give control to the user when we're notified
247 of shared library events by the dynamic linker. */
248 static int stop_on_solib_events
;
250 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
251 struct cmd_list_element
*c
, const char *value
)
253 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
257 /* Nonzero means expecting a trace trap
258 and should stop the inferior and return silently when it happens. */
262 /* Nonzero means expecting a trap and caller will handle it themselves.
263 It is used after attach, due to attaching to a process;
264 when running in the shell before the child program has been exec'd;
265 and when running some kinds of remote stuff (FIXME?). */
267 enum stop_kind stop_soon
;
269 /* Nonzero if proceed is being used for a "finish" command or a similar
270 situation when stop_registers should be saved. */
272 int proceed_to_finish
;
274 /* Save register contents here when about to pop a stack dummy frame,
275 if-and-only-if proceed_to_finish is set.
276 Thus this contains the return value from the called function (assuming
277 values are returned in a register). */
279 struct regcache
*stop_registers
;
281 /* Nonzero after stop if current stack frame should be printed. */
283 static int stop_print_frame
;
285 static struct breakpoint
*step_resume_breakpoint
= NULL
;
287 /* This is a cached copy of the pid/waitstatus of the last event
288 returned by target_wait()/deprecated_target_wait_hook(). This
289 information is returned by get_last_target_status(). */
290 static ptid_t target_last_wait_ptid
;
291 static struct target_waitstatus target_last_waitstatus
;
293 /* This is used to remember when a fork, vfork or exec event
294 was caught by a catchpoint, and thus the event is to be
295 followed at the next resume of the inferior, and not
299 enum target_waitkind kind
;
306 char *execd_pathname
;
310 static const char follow_fork_mode_child
[] = "child";
311 static const char follow_fork_mode_parent
[] = "parent";
313 static const char *follow_fork_mode_kind_names
[] = {
314 follow_fork_mode_child
,
315 follow_fork_mode_parent
,
319 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
321 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
322 struct cmd_list_element
*c
, const char *value
)
324 fprintf_filtered (file
, _("\
325 Debugger response to a program call of fork or vfork is \"%s\".\n"),
333 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
335 return target_follow_fork (follow_child
);
339 follow_inferior_reset_breakpoints (void)
341 /* Was there a step_resume breakpoint? (There was if the user
342 did a "next" at the fork() call.) If so, explicitly reset its
345 step_resumes are a form of bp that are made to be per-thread.
346 Since we created the step_resume bp when the parent process
347 was being debugged, and now are switching to the child process,
348 from the breakpoint package's viewpoint, that's a switch of
349 "threads". We must update the bp's notion of which thread
350 it is for, or it'll be ignored when it triggers. */
352 if (step_resume_breakpoint
)
353 breakpoint_re_set_thread (step_resume_breakpoint
);
355 /* Reinsert all breakpoints in the child. The user may have set
356 breakpoints after catching the fork, in which case those
357 were never set in the child, but only in the parent. This makes
358 sure the inserted breakpoints match the breakpoint list. */
360 breakpoint_re_set ();
361 insert_breakpoints ();
364 /* EXECD_PATHNAME is assumed to be non-NULL. */
367 follow_exec (int pid
, char *execd_pathname
)
370 struct target_ops
*tgt
;
372 if (!may_follow_exec
)
375 /* This is an exec event that we actually wish to pay attention to.
376 Refresh our symbol table to the newly exec'd program, remove any
379 If there are breakpoints, they aren't really inserted now,
380 since the exec() transformed our inferior into a fresh set
383 We want to preserve symbolic breakpoints on the list, since
384 we have hopes that they can be reset after the new a.out's
385 symbol table is read.
387 However, any "raw" breakpoints must be removed from the list
388 (e.g., the solib bp's), since their address is probably invalid
391 And, we DON'T want to call delete_breakpoints() here, since
392 that may write the bp's "shadow contents" (the instruction
393 value that was overwritten witha TRAP instruction). Since
394 we now have a new a.out, those shadow contents aren't valid. */
395 update_breakpoints_after_exec ();
397 /* If there was one, it's gone now. We cannot truly step-to-next
398 statement through an exec(). */
399 step_resume_breakpoint
= NULL
;
400 step_range_start
= 0;
403 /* What is this a.out's name? */
404 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
406 /* We've followed the inferior through an exec. Therefore, the
407 inferior has essentially been killed & reborn. */
409 /* First collect the run target in effect. */
410 tgt
= find_run_target ();
411 /* If we can't find one, things are in a very strange state... */
413 error (_("Could find run target to save before following exec"));
415 gdb_flush (gdb_stdout
);
416 target_mourn_inferior ();
417 inferior_ptid
= pid_to_ptid (saved_pid
);
418 /* Because mourn_inferior resets inferior_ptid. */
421 /* That a.out is now the one to use. */
422 exec_file_attach (execd_pathname
, 0);
424 /* And also is where symbols can be found. */
425 symbol_file_add_main (execd_pathname
, 0);
427 /* Reset the shared library package. This ensures that we get
428 a shlib event when the child reaches "_start", at which point
429 the dld will have had a chance to initialize the child. */
430 #if defined(SOLIB_RESTART)
433 #ifdef SOLIB_CREATE_INFERIOR_HOOK
434 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
436 solib_create_inferior_hook ();
439 /* Reinsert all breakpoints. (Those which were symbolic have
440 been reset to the proper address in the new a.out, thanks
441 to symbol_file_command...) */
442 insert_breakpoints ();
444 /* The next resume of this inferior should bring it to the shlib
445 startup breakpoints. (If the user had also set bp's on
446 "main" from the old (parent) process, then they'll auto-
447 matically get reset there in the new process.) */
450 /* Non-zero if we just simulating a single-step. This is needed
451 because we cannot remove the breakpoints in the inferior process
452 until after the `wait' in `wait_for_inferior'. */
453 static int singlestep_breakpoints_inserted_p
= 0;
455 /* The thread we inserted single-step breakpoints for. */
456 static ptid_t singlestep_ptid
;
458 /* PC when we started this single-step. */
459 static CORE_ADDR singlestep_pc
;
461 /* If another thread hit the singlestep breakpoint, we save the original
462 thread here so that we can resume single-stepping it later. */
463 static ptid_t saved_singlestep_ptid
;
464 static int stepping_past_singlestep_breakpoint
;
466 /* If not equal to null_ptid, this means that after stepping over breakpoint
467 is finished, we need to switch to deferred_step_ptid, and step it.
469 The use case is when one thread has hit a breakpoint, and then the user
470 has switched to another thread and issued 'step'. We need to step over
471 breakpoint in the thread which hit the breakpoint, but then continue
472 stepping the thread user has selected. */
473 static ptid_t deferred_step_ptid
;
476 /* Things to clean up if we QUIT out of resume (). */
478 resume_cleanups (void *ignore
)
483 static const char schedlock_off
[] = "off";
484 static const char schedlock_on
[] = "on";
485 static const char schedlock_step
[] = "step";
486 static const char *scheduler_enums
[] = {
492 static const char *scheduler_mode
= schedlock_off
;
494 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
495 struct cmd_list_element
*c
, const char *value
)
497 fprintf_filtered (file
, _("\
498 Mode for locking scheduler during execution is \"%s\".\n"),
503 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
505 if (!target_can_lock_scheduler
)
507 scheduler_mode
= schedlock_off
;
508 error (_("Target '%s' cannot support this command."), target_shortname
);
513 /* Resume the inferior, but allow a QUIT. This is useful if the user
514 wants to interrupt some lengthy single-stepping operation
515 (for child processes, the SIGINT goes to the inferior, and so
516 we get a SIGINT random_signal, but for remote debugging and perhaps
517 other targets, that's not true).
519 STEP nonzero if we should step (zero to continue instead).
520 SIG is the signal to give the inferior (zero for none). */
522 resume (int step
, enum target_signal sig
)
524 int should_resume
= 1;
525 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
529 fprintf_unfiltered (gdb_stdlog
, "infrun: resume (step=%d, signal=%d)\n",
532 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
535 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
536 over an instruction that causes a page fault without triggering
537 a hardware watchpoint. The kernel properly notices that it shouldn't
538 stop, because the hardware watchpoint is not triggered, but it forgets
539 the step request and continues the program normally.
540 Work around the problem by removing hardware watchpoints if a step is
541 requested, GDB will check for a hardware watchpoint trigger after the
543 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
544 remove_hw_watchpoints ();
547 /* Normally, by the time we reach `resume', the breakpoints are either
548 removed or inserted, as appropriate. The exception is if we're sitting
549 at a permanent breakpoint; we need to step over it, but permanent
550 breakpoints can't be removed. So we have to test for it here. */
551 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
553 if (gdbarch_skip_permanent_breakpoint_p (current_gdbarch
))
554 gdbarch_skip_permanent_breakpoint (current_gdbarch
,
555 get_current_regcache ());
558 The program is stopped at a permanent breakpoint, but GDB does not know\n\
559 how to step past a permanent breakpoint on this architecture. Try using\n\
560 a command like `return' or `jump' to continue execution."));
563 if (step
&& gdbarch_software_single_step_p (current_gdbarch
))
565 /* Do it the hard way, w/temp breakpoints */
566 if (gdbarch_software_single_step (current_gdbarch
, get_current_frame ()))
568 /* ...and don't ask hardware to do it. */
570 /* and do not pull these breakpoints until after a `wait' in
571 `wait_for_inferior' */
572 singlestep_breakpoints_inserted_p
= 1;
573 singlestep_ptid
= inferior_ptid
;
574 singlestep_pc
= read_pc ();
578 /* If there were any forks/vforks/execs that were caught and are
579 now to be followed, then do so. */
580 switch (pending_follow
.kind
)
582 case TARGET_WAITKIND_FORKED
:
583 case TARGET_WAITKIND_VFORKED
:
584 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
589 case TARGET_WAITKIND_EXECD
:
590 /* follow_exec is called as soon as the exec event is seen. */
591 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
598 /* Install inferior's terminal modes. */
599 target_terminal_inferior ();
605 resume_ptid
= RESUME_ALL
; /* Default */
607 /* If STEP is set, it's a request to use hardware stepping
608 facilities. But in that case, we should never
609 use singlestep breakpoint. */
610 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
612 if (singlestep_breakpoints_inserted_p
613 && stepping_past_singlestep_breakpoint
)
615 /* The situation here is as follows. In thread T1 we wanted to
616 single-step. Lacking hardware single-stepping we've
617 set breakpoint at the PC of the next instruction -- call it
618 P. After resuming, we've hit that breakpoint in thread T2.
619 Now we've removed original breakpoint, inserted breakpoint
620 at P+1, and try to step to advance T2 past breakpoint.
621 We need to step only T2, as if T1 is allowed to freely run,
622 it can run past P, and if other threads are allowed to run,
623 they can hit breakpoint at P+1, and nested hits of single-step
624 breakpoints is not something we'd want -- that's complicated
625 to support, and has no value. */
626 resume_ptid
= inferior_ptid
;
629 if ((step
|| singlestep_breakpoints_inserted_p
)
630 && breakpoint_here_p (read_pc ())
631 && !breakpoint_inserted_here_p (read_pc ()))
633 /* We're stepping, have breakpoint at PC, and it's
634 not inserted. Most likely, proceed has noticed that
635 we have breakpoint and tries to single-step over it,
636 so that it's not hit. In which case, we need to
637 single-step only this thread, and keep others stopped,
638 as they can miss this breakpoint if allowed to run.
640 The current code either has all breakpoints inserted,
641 or all removed, so if we let other threads run,
642 we can actually miss any breakpoint, not the one at PC. */
643 resume_ptid
= inferior_ptid
;
646 if ((scheduler_mode
== schedlock_on
)
647 || (scheduler_mode
== schedlock_step
648 && (step
|| singlestep_breakpoints_inserted_p
)))
650 /* User-settable 'scheduler' mode requires solo thread resume. */
651 resume_ptid
= inferior_ptid
;
654 if (gdbarch_cannot_step_breakpoint (current_gdbarch
))
656 /* Most targets can step a breakpoint instruction, thus
657 executing it normally. But if this one cannot, just
658 continue and we will hit it anyway. */
659 if (step
&& breakpoint_inserted_here_p (read_pc ()))
662 target_resume (resume_ptid
, step
, sig
);
665 discard_cleanups (old_cleanups
);
669 /* Clear out all variables saying what to do when inferior is continued.
670 First do this, then set the ones you want, then call `proceed'. */
673 clear_proceed_status (void)
675 stepping_over_breakpoint
= 0;
676 step_range_start
= 0;
678 step_frame_id
= null_frame_id
;
679 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
681 stop_soon
= NO_STOP_QUIETLY
;
682 proceed_to_finish
= 0;
683 breakpoint_proceeded
= 1; /* We're about to proceed... */
687 regcache_xfree (stop_registers
);
688 stop_registers
= NULL
;
691 /* Discard any remaining commands or status from previous stop. */
692 bpstat_clear (&stop_bpstat
);
695 /* This should be suitable for any targets that support threads. */
698 prepare_to_proceed (int step
)
701 struct target_waitstatus wait_status
;
703 /* Get the last target status returned by target_wait(). */
704 get_last_target_status (&wait_ptid
, &wait_status
);
706 /* Make sure we were stopped at a breakpoint. */
707 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
708 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
713 /* Switched over from WAIT_PID. */
714 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
715 && !ptid_equal (inferior_ptid
, wait_ptid
)
716 && breakpoint_here_p (read_pc_pid (wait_ptid
)))
718 /* If stepping, remember current thread to switch back to. */
721 deferred_step_ptid
= inferior_ptid
;
724 /* Switch back to WAIT_PID thread. */
725 switch_to_thread (wait_ptid
);
727 /* We return 1 to indicate that there is a breakpoint here,
728 so we need to step over it before continuing to avoid
729 hitting it straight away. */
736 /* Record the pc of the program the last time it stopped. This is
737 just used internally by wait_for_inferior, but need to be preserved
738 over calls to it and cleared when the inferior is started. */
739 static CORE_ADDR prev_pc
;
741 /* Basic routine for continuing the program in various fashions.
743 ADDR is the address to resume at, or -1 for resume where stopped.
744 SIGGNAL is the signal to give it, or 0 for none,
745 or -1 for act according to how it stopped.
746 STEP is nonzero if should trap after one instruction.
747 -1 means return after that and print nothing.
748 You should probably set various step_... variables
749 before calling here, if you are stepping.
751 You should call clear_proceed_status before calling proceed. */
754 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
759 step_start_function
= find_pc_function (read_pc ());
763 if (addr
== (CORE_ADDR
) -1)
765 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
766 /* There is a breakpoint at the address we will resume at,
767 step one instruction before inserting breakpoints so that
768 we do not stop right away (and report a second hit at this
771 else if (gdbarch_single_step_through_delay_p (current_gdbarch
)
772 && gdbarch_single_step_through_delay (current_gdbarch
,
773 get_current_frame ()))
774 /* We stepped onto an instruction that needs to be stepped
775 again before re-inserting the breakpoint, do so. */
784 fprintf_unfiltered (gdb_stdlog
,
785 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
786 paddr_nz (addr
), siggnal
, step
);
788 /* In a multi-threaded task we may select another thread
789 and then continue or step.
791 But if the old thread was stopped at a breakpoint, it
792 will immediately cause another breakpoint stop without
793 any execution (i.e. it will report a breakpoint hit
794 incorrectly). So we must step over it first.
796 prepare_to_proceed checks the current thread against the thread
797 that reported the most recent event. If a step-over is required
798 it returns TRUE and sets the current thread to the old thread. */
799 if (prepare_to_proceed (step
))
803 /* We will get a trace trap after one instruction.
804 Continue it automatically and insert breakpoints then. */
805 stepping_over_breakpoint
= 1;
807 insert_breakpoints ();
809 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
810 stop_signal
= siggnal
;
811 /* If this signal should not be seen by program,
812 give it zero. Used for debugging signals. */
813 else if (!signal_program
[stop_signal
])
814 stop_signal
= TARGET_SIGNAL_0
;
816 annotate_starting ();
818 /* Make sure that output from GDB appears before output from the
820 gdb_flush (gdb_stdout
);
822 /* Refresh prev_pc value just prior to resuming. This used to be
823 done in stop_stepping, however, setting prev_pc there did not handle
824 scenarios such as inferior function calls or returning from
825 a function via the return command. In those cases, the prev_pc
826 value was not set properly for subsequent commands. The prev_pc value
827 is used to initialize the starting line number in the ecs. With an
828 invalid value, the gdb next command ends up stopping at the position
829 represented by the next line table entry past our start position.
830 On platforms that generate one line table entry per line, this
831 is not a problem. However, on the ia64, the compiler generates
832 extraneous line table entries that do not increase the line number.
833 When we issue the gdb next command on the ia64 after an inferior call
834 or a return command, we often end up a few instructions forward, still
835 within the original line we started.
837 An attempt was made to have init_execution_control_state () refresh
838 the prev_pc value before calculating the line number. This approach
839 did not work because on platforms that use ptrace, the pc register
840 cannot be read unless the inferior is stopped. At that point, we
841 are not guaranteed the inferior is stopped and so the read_pc ()
842 call can fail. Setting the prev_pc value here ensures the value is
843 updated correctly when the inferior is stopped. */
844 prev_pc
= read_pc ();
846 /* Resume inferior. */
847 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
849 /* Wait for it to stop (if not standalone)
850 and in any case decode why it stopped, and act accordingly. */
851 /* Do this only if we are not using the event loop, or if the target
852 does not support asynchronous execution. */
853 if (!target_can_async_p ())
855 wait_for_inferior ();
861 /* Start remote-debugging of a machine over a serial link. */
864 start_remote (int from_tty
)
867 init_wait_for_inferior ();
868 stop_soon
= STOP_QUIETLY_REMOTE
;
869 stepping_over_breakpoint
= 0;
871 /* Always go on waiting for the target, regardless of the mode. */
872 /* FIXME: cagney/1999-09-23: At present it isn't possible to
873 indicate to wait_for_inferior that a target should timeout if
874 nothing is returned (instead of just blocking). Because of this,
875 targets expecting an immediate response need to, internally, set
876 things up so that the target_wait() is forced to eventually
878 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
879 differentiate to its caller what the state of the target is after
880 the initial open has been performed. Here we're assuming that
881 the target has stopped. It should be possible to eventually have
882 target_open() return to the caller an indication that the target
883 is currently running and GDB state should be set to the same as
885 wait_for_inferior ();
887 /* Now that the inferior has stopped, do any bookkeeping like
888 loading shared libraries. We want to do this before normal_stop,
889 so that the displayed frame is up to date. */
890 post_create_inferior (¤t_target
, from_tty
);
895 /* Initialize static vars when a new inferior begins. */
898 init_wait_for_inferior (void)
900 /* These are meaningless until the first time through wait_for_inferior. */
903 breakpoint_init_inferior (inf_starting
);
905 /* Don't confuse first call to proceed(). */
906 stop_signal
= TARGET_SIGNAL_0
;
908 /* The first resume is not following a fork/vfork/exec. */
909 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
911 clear_proceed_status ();
913 stepping_past_singlestep_breakpoint
= 0;
914 deferred_step_ptid
= null_ptid
;
916 target_last_wait_ptid
= minus_one_ptid
;
919 /* This enum encodes possible reasons for doing a target_wait, so that
920 wfi can call target_wait in one place. (Ultimately the call will be
921 moved out of the infinite loop entirely.) */
925 infwait_normal_state
,
926 infwait_thread_hop_state
,
927 infwait_step_watch_state
,
928 infwait_nonstep_watch_state
931 /* Why did the inferior stop? Used to print the appropriate messages
932 to the interface from within handle_inferior_event(). */
933 enum inferior_stop_reason
935 /* Step, next, nexti, stepi finished. */
937 /* Inferior terminated by signal. */
939 /* Inferior exited. */
941 /* Inferior received signal, and user asked to be notified. */
945 /* This structure contains what used to be local variables in
946 wait_for_inferior. Probably many of them can return to being
947 locals in handle_inferior_event. */
949 struct execution_control_state
951 struct target_waitstatus ws
;
952 struct target_waitstatus
*wp
;
953 /* Should we step over breakpoint next time keep_going
955 int stepping_over_breakpoint
;
957 CORE_ADDR stop_func_start
;
958 CORE_ADDR stop_func_end
;
959 char *stop_func_name
;
960 struct symtab_and_line sal
;
962 struct symtab
*current_symtab
;
963 int handling_longjmp
; /* FIXME */
965 ptid_t saved_inferior_ptid
;
966 int step_after_step_resume_breakpoint
;
967 int stepping_through_solib_after_catch
;
968 bpstat stepping_through_solib_catchpoints
;
969 int new_thread_event
;
970 struct target_waitstatus tmpstatus
;
971 enum infwait_states infwait_state
;
976 void init_execution_control_state (struct execution_control_state
*ecs
);
978 void handle_inferior_event (struct execution_control_state
*ecs
);
980 static void step_into_function (struct execution_control_state
*ecs
);
981 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
982 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
983 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
984 struct frame_id sr_id
);
985 static void stop_stepping (struct execution_control_state
*ecs
);
986 static void prepare_to_wait (struct execution_control_state
*ecs
);
987 static void keep_going (struct execution_control_state
*ecs
);
988 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
991 /* Wait for control to return from inferior to debugger.
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 (void)
1000 struct cleanup
*old_cleanups
;
1001 struct execution_control_state ecss
;
1002 struct execution_control_state
*ecs
;
1005 fprintf_unfiltered (gdb_stdlog
, "infrun: wait_for_inferior\n");
1007 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
1008 &step_resume_breakpoint
);
1010 /* wfi still stays in a loop, so it's OK just to take the address of
1011 a local to get the ecs pointer. */
1014 /* Fill in with reasonable starting values. */
1015 init_execution_control_state (ecs
);
1017 /* We'll update this if & when we switch to a new thread. */
1018 previous_inferior_ptid
= inferior_ptid
;
1020 overlay_cache_invalid
= 1;
1022 /* We have to invalidate the registers BEFORE calling target_wait
1023 because they can be loaded from the target while in target_wait.
1024 This makes remote debugging a bit more efficient for those
1025 targets that provide critical registers as part of their normal
1026 status mechanism. */
1028 registers_changed ();
1032 if (deprecated_target_wait_hook
)
1033 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1035 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1037 /* Now figure out what to do with the result of the result. */
1038 handle_inferior_event (ecs
);
1040 if (!ecs
->wait_some_more
)
1043 do_cleanups (old_cleanups
);
1046 /* Asynchronous version of wait_for_inferior. It is called by the
1047 event loop whenever a change of state is detected on the file
1048 descriptor corresponding to the target. It can be called more than
1049 once to complete a single execution command. In such cases we need
1050 to keep the state in a global variable ASYNC_ECSS. If it is the
1051 last time that this function is called for a single execution
1052 command, then report to the user that the inferior has stopped, and
1053 do the necessary cleanups. */
1055 struct execution_control_state async_ecss
;
1056 struct execution_control_state
*async_ecs
;
1059 fetch_inferior_event (void *client_data
)
1061 static struct cleanup
*old_cleanups
;
1063 async_ecs
= &async_ecss
;
1065 if (!async_ecs
->wait_some_more
)
1067 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1068 &step_resume_breakpoint
);
1070 /* Fill in with reasonable starting values. */
1071 init_execution_control_state (async_ecs
);
1073 /* We'll update this if & when we switch to a new thread. */
1074 previous_inferior_ptid
= inferior_ptid
;
1076 overlay_cache_invalid
= 1;
1078 /* We have to invalidate the registers BEFORE calling target_wait
1079 because they can be loaded from the target while in target_wait.
1080 This makes remote debugging a bit more efficient for those
1081 targets that provide critical registers as part of their normal
1082 status mechanism. */
1084 registers_changed ();
1087 if (deprecated_target_wait_hook
)
1089 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1091 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1093 /* Now figure out what to do with the result of the result. */
1094 handle_inferior_event (async_ecs
);
1096 if (!async_ecs
->wait_some_more
)
1098 /* Do only the cleanups that have been added by this
1099 function. Let the continuations for the commands do the rest,
1100 if there are any. */
1101 do_exec_cleanups (old_cleanups
);
1103 if (step_multi
&& stop_step
)
1104 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1106 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1110 /* Prepare an execution control state for looping through a
1111 wait_for_inferior-type loop. */
1114 init_execution_control_state (struct execution_control_state
*ecs
)
1116 ecs
->stepping_over_breakpoint
= 0;
1117 ecs
->random_signal
= 0;
1118 ecs
->step_after_step_resume_breakpoint
= 0;
1119 ecs
->handling_longjmp
= 0; /* FIXME */
1120 ecs
->stepping_through_solib_after_catch
= 0;
1121 ecs
->stepping_through_solib_catchpoints
= NULL
;
1122 ecs
->sal
= find_pc_line (prev_pc
, 0);
1123 ecs
->current_line
= ecs
->sal
.line
;
1124 ecs
->current_symtab
= ecs
->sal
.symtab
;
1125 ecs
->infwait_state
= infwait_normal_state
;
1126 ecs
->waiton_ptid
= pid_to_ptid (-1);
1127 ecs
->wp
= &(ecs
->ws
);
1130 /* Return the cached copy of the last pid/waitstatus returned by
1131 target_wait()/deprecated_target_wait_hook(). The data is actually
1132 cached by handle_inferior_event(), which gets called immediately
1133 after target_wait()/deprecated_target_wait_hook(). */
1136 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1138 *ptidp
= target_last_wait_ptid
;
1139 *status
= target_last_waitstatus
;
1143 nullify_last_target_wait_ptid (void)
1145 target_last_wait_ptid
= minus_one_ptid
;
1148 /* Switch thread contexts, maintaining "infrun state". */
1151 context_switch (struct execution_control_state
*ecs
)
1153 /* Caution: it may happen that the new thread (or the old one!)
1154 is not in the thread list. In this case we must not attempt
1155 to "switch context", or we run the risk that our context may
1156 be lost. This may happen as a result of the target module
1157 mishandling thread creation. */
1161 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
1162 target_pid_to_str (inferior_ptid
));
1163 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
1164 target_pid_to_str (ecs
->ptid
));
1167 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1168 { /* Perform infrun state context switch: */
1169 /* Save infrun state for the old thread. */
1170 save_infrun_state (inferior_ptid
, prev_pc
,
1171 stepping_over_breakpoint
, step_resume_breakpoint
,
1173 step_range_end
, &step_frame_id
,
1174 ecs
->handling_longjmp
, ecs
->stepping_over_breakpoint
,
1175 ecs
->stepping_through_solib_after_catch
,
1176 ecs
->stepping_through_solib_catchpoints
,
1177 ecs
->current_line
, ecs
->current_symtab
);
1179 /* Load infrun state for the new thread. */
1180 load_infrun_state (ecs
->ptid
, &prev_pc
,
1181 &stepping_over_breakpoint
, &step_resume_breakpoint
,
1183 &step_range_end
, &step_frame_id
,
1184 &ecs
->handling_longjmp
, &ecs
->stepping_over_breakpoint
,
1185 &ecs
->stepping_through_solib_after_catch
,
1186 &ecs
->stepping_through_solib_catchpoints
,
1187 &ecs
->current_line
, &ecs
->current_symtab
);
1190 switch_to_thread (ecs
->ptid
);
1194 adjust_pc_after_break (struct execution_control_state
*ecs
)
1196 CORE_ADDR breakpoint_pc
;
1198 /* If this target does not decrement the PC after breakpoints, then
1199 we have nothing to do. */
1200 if (gdbarch_decr_pc_after_break (current_gdbarch
) == 0)
1203 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1204 we aren't, just return.
1206 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1207 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1208 implemented by software breakpoints should be handled through the normal
1211 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1212 different signals (SIGILL or SIGEMT for instance), but it is less
1213 clear where the PC is pointing afterwards. It may not match
1214 gdbarch_decr_pc_after_break. I don't know any specific target that
1215 generates these signals at breakpoints (the code has been in GDB since at
1216 least 1992) so I can not guess how to handle them here.
1218 In earlier versions of GDB, a target with
1219 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
1220 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
1221 target with both of these set in GDB history, and it seems unlikely to be
1222 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
1224 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1227 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1230 /* Find the location where (if we've hit a breakpoint) the
1231 breakpoint would be. */
1232 breakpoint_pc
= read_pc_pid (ecs
->ptid
) - gdbarch_decr_pc_after_break
1235 /* Check whether there actually is a software breakpoint inserted
1236 at that location. */
1237 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1239 /* When using hardware single-step, a SIGTRAP is reported for both
1240 a completed single-step and a software breakpoint. Need to
1241 differentiate between the two, as the latter needs adjusting
1242 but the former does not.
1244 The SIGTRAP can be due to a completed hardware single-step only if
1245 - we didn't insert software single-step breakpoints
1246 - the thread to be examined is still the current thread
1247 - this thread is currently being stepped
1249 If any of these events did not occur, we must have stopped due
1250 to hitting a software breakpoint, and have to back up to the
1253 As a special case, we could have hardware single-stepped a
1254 software breakpoint. In this case (prev_pc == breakpoint_pc),
1255 we also need to back up to the breakpoint address. */
1257 if (singlestep_breakpoints_inserted_p
1258 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
1259 || !currently_stepping (ecs
)
1260 || prev_pc
== breakpoint_pc
)
1261 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1265 /* Given an execution control state that has been freshly filled in
1266 by an event from the inferior, figure out what it means and take
1267 appropriate action. */
1270 handle_inferior_event (struct execution_control_state
*ecs
)
1272 int sw_single_step_trap_p
= 0;
1273 int stopped_by_watchpoint
;
1274 int stepped_after_stopped_by_watchpoint
= 0;
1276 /* Cache the last pid/waitstatus. */
1277 target_last_wait_ptid
= ecs
->ptid
;
1278 target_last_waitstatus
= *ecs
->wp
;
1280 /* Always clear state belonging to the previous time we stopped. */
1281 stop_stack_dummy
= 0;
1283 adjust_pc_after_break (ecs
);
1285 switch (ecs
->infwait_state
)
1287 case infwait_thread_hop_state
:
1289 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1290 /* Cancel the waiton_ptid. */
1291 ecs
->waiton_ptid
= pid_to_ptid (-1);
1294 case infwait_normal_state
:
1296 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
1299 case infwait_step_watch_state
:
1301 fprintf_unfiltered (gdb_stdlog
,
1302 "infrun: infwait_step_watch_state\n");
1304 stepped_after_stopped_by_watchpoint
= 1;
1307 case infwait_nonstep_watch_state
:
1309 fprintf_unfiltered (gdb_stdlog
,
1310 "infrun: infwait_nonstep_watch_state\n");
1311 insert_breakpoints ();
1313 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1314 handle things like signals arriving and other things happening
1315 in combination correctly? */
1316 stepped_after_stopped_by_watchpoint
= 1;
1320 internal_error (__FILE__
, __LINE__
, _("bad switch"));
1322 ecs
->infwait_state
= infwait_normal_state
;
1324 reinit_frame_cache ();
1326 /* If it's a new process, add it to the thread database */
1328 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1329 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1330 && !in_thread_list (ecs
->ptid
));
1332 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1333 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1335 add_thread (ecs
->ptid
);
1337 ui_out_text (uiout
, "[New ");
1338 ui_out_text (uiout
, target_pid_to_str (ecs
->ptid
));
1339 ui_out_text (uiout
, "]\n");
1342 switch (ecs
->ws
.kind
)
1344 case TARGET_WAITKIND_LOADED
:
1346 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
1347 /* Ignore gracefully during startup of the inferior, as it might
1348 be the shell which has just loaded some objects, otherwise
1349 add the symbols for the newly loaded objects. Also ignore at
1350 the beginning of an attach or remote session; we will query
1351 the full list of libraries once the connection is
1353 if (stop_soon
== NO_STOP_QUIETLY
)
1355 /* Remove breakpoints, SOLIB_ADD might adjust
1356 breakpoint addresses via breakpoint_re_set. */
1357 remove_breakpoints ();
1359 /* Check for any newly added shared libraries if we're
1360 supposed to be adding them automatically. Switch
1361 terminal for any messages produced by
1362 breakpoint_re_set. */
1363 target_terminal_ours_for_output ();
1364 /* NOTE: cagney/2003-11-25: Make certain that the target
1365 stack's section table is kept up-to-date. Architectures,
1366 (e.g., PPC64), use the section table to perform
1367 operations such as address => section name and hence
1368 require the table to contain all sections (including
1369 those found in shared libraries). */
1370 /* NOTE: cagney/2003-11-25: Pass current_target and not
1371 exec_ops to SOLIB_ADD. This is because current GDB is
1372 only tooled to propagate section_table changes out from
1373 the "current_target" (see target_resize_to_sections), and
1374 not up from the exec stratum. This, of course, isn't
1375 right. "infrun.c" should only interact with the
1376 exec/process stratum, instead relying on the target stack
1377 to propagate relevant changes (stop, section table
1378 changed, ...) up to other layers. */
1380 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1382 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
1384 target_terminal_inferior ();
1386 /* If requested, stop when the dynamic linker notifies
1387 gdb of events. This allows the user to get control
1388 and place breakpoints in initializer routines for
1389 dynamically loaded objects (among other things). */
1390 if (stop_on_solib_events
)
1392 stop_stepping (ecs
);
1396 /* NOTE drow/2007-05-11: This might be a good place to check
1397 for "catch load". */
1399 /* Reinsert breakpoints and continue. */
1400 insert_breakpoints ();
1403 /* If we are skipping through a shell, or through shared library
1404 loading that we aren't interested in, resume the program. If
1405 we're running the program normally, also resume. But stop if
1406 we're attaching or setting up a remote connection. */
1407 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
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 /* NOTE drow/2002-12-05: This code should be pushed down into the
1499 target_wait function. Until then following vfork on HP/UX 10.20
1500 is probably broken by this. Of course, it's broken anyway. */
1501 /* Is this a target which reports multiple exec events per actual
1502 call to exec()? (HP-UX using ptrace does, for example.) If so,
1503 ignore all but the last one. Just resume the exec'r, and wait
1504 for the next exec event. */
1505 if (inferior_ignoring_leading_exec_events
)
1507 inferior_ignoring_leading_exec_events
--;
1508 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1509 prepare_to_wait (ecs
);
1512 inferior_ignoring_leading_exec_events
=
1513 target_reported_exec_events_per_exec_call () - 1;
1515 pending_follow
.execd_pathname
=
1516 savestring (ecs
->ws
.value
.execd_pathname
,
1517 strlen (ecs
->ws
.value
.execd_pathname
));
1519 /* This causes the eventpoints and symbol table to be reset. Must
1520 do this now, before trying to determine whether to stop. */
1521 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1522 xfree (pending_follow
.execd_pathname
);
1524 stop_pc
= read_pc_pid (ecs
->ptid
);
1525 ecs
->saved_inferior_ptid
= inferior_ptid
;
1526 inferior_ptid
= ecs
->ptid
;
1528 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1530 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1531 inferior_ptid
= ecs
->saved_inferior_ptid
;
1533 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1535 context_switch (ecs
);
1536 reinit_frame_cache ();
1539 /* If no catchpoint triggered for this, then keep going. */
1540 if (ecs
->random_signal
)
1542 stop_signal
= TARGET_SIGNAL_0
;
1546 goto process_event_stop_test
;
1548 /* Be careful not to try to gather much state about a thread
1549 that's in a syscall. It's frequently a losing proposition. */
1550 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1552 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1553 resume (0, TARGET_SIGNAL_0
);
1554 prepare_to_wait (ecs
);
1557 /* Before examining the threads further, step this thread to
1558 get it entirely out of the syscall. (We get notice of the
1559 event when the thread is just on the verge of exiting a
1560 syscall. Stepping one instruction seems to get it back
1562 case TARGET_WAITKIND_SYSCALL_RETURN
:
1564 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1565 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1566 prepare_to_wait (ecs
);
1569 case TARGET_WAITKIND_STOPPED
:
1571 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
1572 stop_signal
= ecs
->ws
.value
.sig
;
1575 /* We had an event in the inferior, but we are not interested
1576 in handling it at this level. The lower layers have already
1577 done what needs to be done, if anything.
1579 One of the possible circumstances for this is when the
1580 inferior produces output for the console. The inferior has
1581 not stopped, and we are ignoring the event. Another possible
1582 circumstance is any event which the lower level knows will be
1583 reported multiple times without an intervening resume. */
1584 case TARGET_WAITKIND_IGNORE
:
1586 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
1587 prepare_to_wait (ecs
);
1591 /* We may want to consider not doing a resume here in order to give
1592 the user a chance to play with the new thread. It might be good
1593 to make that a user-settable option. */
1595 /* At this point, all threads are stopped (happens automatically in
1596 either the OS or the native code). Therefore we need to continue
1597 all threads in order to make progress. */
1598 if (ecs
->new_thread_event
)
1600 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1601 prepare_to_wait (ecs
);
1605 stop_pc
= read_pc_pid (ecs
->ptid
);
1608 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc
));
1610 if (stepping_past_singlestep_breakpoint
)
1612 gdb_assert (singlestep_breakpoints_inserted_p
);
1613 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1614 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1616 stepping_past_singlestep_breakpoint
= 0;
1618 /* We've either finished single-stepping past the single-step
1619 breakpoint, or stopped for some other reason. It would be nice if
1620 we could tell, but we can't reliably. */
1621 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1624 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
1625 /* Pull the single step breakpoints out of the target. */
1626 remove_single_step_breakpoints ();
1627 singlestep_breakpoints_inserted_p
= 0;
1629 ecs
->random_signal
= 0;
1631 ecs
->ptid
= saved_singlestep_ptid
;
1632 context_switch (ecs
);
1633 if (deprecated_context_hook
)
1634 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1636 resume (1, TARGET_SIGNAL_0
);
1637 prepare_to_wait (ecs
);
1642 stepping_past_singlestep_breakpoint
= 0;
1644 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
1646 /* If we stopped for some other reason than single-stepping, ignore
1647 the fact that we were supposed to switch back. */
1648 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1651 fprintf_unfiltered (gdb_stdlog
,
1652 "infrun: handling deferred step\n");
1654 /* Pull the single step breakpoints out of the target. */
1655 if (singlestep_breakpoints_inserted_p
)
1657 remove_single_step_breakpoints ();
1658 singlestep_breakpoints_inserted_p
= 0;
1661 /* Note: We do not call context_switch at this point, as the
1662 context is already set up for stepping the original thread. */
1663 switch_to_thread (deferred_step_ptid
);
1664 deferred_step_ptid
= null_ptid
;
1665 /* Suppress spurious "Switching to ..." message. */
1666 previous_inferior_ptid
= inferior_ptid
;
1668 resume (1, TARGET_SIGNAL_0
);
1669 prepare_to_wait (ecs
);
1673 deferred_step_ptid
= null_ptid
;
1676 /* See if a thread hit a thread-specific breakpoint that was meant for
1677 another thread. If so, then step that thread past the breakpoint,
1680 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1682 int thread_hop_needed
= 0;
1684 /* Check if a regular breakpoint has been hit before checking
1685 for a potential single step breakpoint. Otherwise, GDB will
1686 not see this breakpoint hit when stepping onto breakpoints. */
1687 if (regular_breakpoint_inserted_here_p (stop_pc
))
1689 ecs
->random_signal
= 0;
1690 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1691 thread_hop_needed
= 1;
1693 else if (singlestep_breakpoints_inserted_p
)
1695 /* We have not context switched yet, so this should be true
1696 no matter which thread hit the singlestep breakpoint. */
1697 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
1699 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
1701 target_pid_to_str (ecs
->ptid
));
1703 ecs
->random_signal
= 0;
1704 /* The call to in_thread_list is necessary because PTIDs sometimes
1705 change when we go from single-threaded to multi-threaded. If
1706 the singlestep_ptid is still in the list, assume that it is
1707 really different from ecs->ptid. */
1708 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1709 && in_thread_list (singlestep_ptid
))
1711 /* If the PC of the thread we were trying to single-step
1712 has changed, discard this event (which we were going
1713 to ignore anyway), and pretend we saw that thread
1714 trap. This prevents us continuously moving the
1715 single-step breakpoint forward, one instruction at a
1716 time. If the PC has changed, then the thread we were
1717 trying to single-step has trapped or been signalled,
1718 but the event has not been reported to GDB yet.
1720 There might be some cases where this loses signal
1721 information, if a signal has arrived at exactly the
1722 same time that the PC changed, but this is the best
1723 we can do with the information available. Perhaps we
1724 should arrange to report all events for all threads
1725 when they stop, or to re-poll the remote looking for
1726 this particular thread (i.e. temporarily enable
1728 if (read_pc_pid (singlestep_ptid
) != singlestep_pc
)
1731 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
1732 " but expected thread advanced also\n");
1734 /* The current context still belongs to
1735 singlestep_ptid. Don't swap here, since that's
1736 the context we want to use. Just fudge our
1737 state and continue. */
1738 ecs
->ptid
= singlestep_ptid
;
1739 stop_pc
= read_pc_pid (ecs
->ptid
);
1744 fprintf_unfiltered (gdb_stdlog
,
1745 "infrun: unexpected thread\n");
1747 thread_hop_needed
= 1;
1748 stepping_past_singlestep_breakpoint
= 1;
1749 saved_singlestep_ptid
= singlestep_ptid
;
1754 if (thread_hop_needed
)
1759 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
1761 /* Saw a breakpoint, but it was hit by the wrong thread.
1764 if (singlestep_breakpoints_inserted_p
)
1766 /* Pull the single step breakpoints out of the target. */
1767 remove_single_step_breakpoints ();
1768 singlestep_breakpoints_inserted_p
= 0;
1771 remove_status
= remove_breakpoints ();
1772 /* Did we fail to remove breakpoints? If so, try
1773 to set the PC past the bp. (There's at least
1774 one situation in which we can fail to remove
1775 the bp's: On HP-UX's that use ttrace, we can't
1776 change the address space of a vforking child
1777 process until the child exits (well, okay, not
1778 then either :-) or execs. */
1779 if (remove_status
!= 0)
1780 error (_("Cannot step over breakpoint hit in wrong thread"));
1783 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1784 context_switch (ecs
);
1785 ecs
->waiton_ptid
= ecs
->ptid
;
1786 ecs
->wp
= &(ecs
->ws
);
1787 ecs
->stepping_over_breakpoint
= 1;
1789 ecs
->infwait_state
= infwait_thread_hop_state
;
1791 registers_changed ();
1795 else if (singlestep_breakpoints_inserted_p
)
1797 sw_single_step_trap_p
= 1;
1798 ecs
->random_signal
= 0;
1802 ecs
->random_signal
= 1;
1804 /* See if something interesting happened to the non-current thread. If
1805 so, then switch to that thread. */
1806 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1809 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
1811 context_switch (ecs
);
1813 if (deprecated_context_hook
)
1814 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1817 if (singlestep_breakpoints_inserted_p
)
1819 /* Pull the single step breakpoints out of the target. */
1820 remove_single_step_breakpoints ();
1821 singlestep_breakpoints_inserted_p
= 0;
1824 if (stepped_after_stopped_by_watchpoint
)
1825 stopped_by_watchpoint
= 0;
1827 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
1829 /* If necessary, step over this watchpoint. We'll be back to display
1831 if (stopped_by_watchpoint
1832 && (HAVE_STEPPABLE_WATCHPOINT
1833 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
1836 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1838 /* At this point, we are stopped at an instruction which has
1839 attempted to write to a piece of memory under control of
1840 a watchpoint. The instruction hasn't actually executed
1841 yet. If we were to evaluate the watchpoint expression
1842 now, we would get the old value, and therefore no change
1843 would seem to have occurred.
1845 In order to make watchpoints work `right', we really need
1846 to complete the memory write, and then evaluate the
1847 watchpoint expression. We do this by single-stepping the
1850 It may not be necessary to disable the watchpoint to stop over
1851 it. For example, the PA can (with some kernel cooperation)
1852 single step over a watchpoint without disabling the watchpoint.
1854 It is far more common to need to disable a watchpoint to step
1855 the inferior over it. If we have non-steppable watchpoints,
1856 we must disable the current watchpoint; it's simplest to
1857 disable all watchpoints and breakpoints. */
1859 if (!HAVE_STEPPABLE_WATCHPOINT
)
1860 remove_breakpoints ();
1861 registers_changed ();
1862 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1863 ecs
->waiton_ptid
= ecs
->ptid
;
1864 if (HAVE_STEPPABLE_WATCHPOINT
)
1865 ecs
->infwait_state
= infwait_step_watch_state
;
1867 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1868 prepare_to_wait (ecs
);
1872 ecs
->stop_func_start
= 0;
1873 ecs
->stop_func_end
= 0;
1874 ecs
->stop_func_name
= 0;
1875 /* Don't care about return value; stop_func_start and stop_func_name
1876 will both be 0 if it doesn't work. */
1877 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1878 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1879 ecs
->stop_func_start
1880 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
1881 ecs
->stepping_over_breakpoint
= 0;
1882 bpstat_clear (&stop_bpstat
);
1884 stop_print_frame
= 1;
1885 ecs
->random_signal
= 0;
1886 stopped_by_random_signal
= 0;
1888 if (stop_signal
== TARGET_SIGNAL_TRAP
1889 && stepping_over_breakpoint
1890 && gdbarch_single_step_through_delay_p (current_gdbarch
)
1891 && currently_stepping (ecs
))
1893 /* We're trying to step off a breakpoint. Turns out that we're
1894 also on an instruction that needs to be stepped multiple
1895 times before it's been fully executing. E.g., architectures
1896 with a delay slot. It needs to be stepped twice, once for
1897 the instruction and once for the delay slot. */
1898 int step_through_delay
1899 = gdbarch_single_step_through_delay (current_gdbarch
,
1900 get_current_frame ());
1901 if (debug_infrun
&& step_through_delay
)
1902 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
1903 if (step_range_end
== 0 && step_through_delay
)
1905 /* The user issued a continue when stopped at a breakpoint.
1906 Set up for another trap and get out of here. */
1907 ecs
->stepping_over_breakpoint
= 1;
1911 else if (step_through_delay
)
1913 /* The user issued a step when stopped at a breakpoint.
1914 Maybe we should stop, maybe we should not - the delay
1915 slot *might* correspond to a line of source. In any
1916 case, don't decide that here, just set
1917 ecs->stepping_over_breakpoint, making sure we
1918 single-step again before breakpoints are re-inserted. */
1919 ecs
->stepping_over_breakpoint
= 1;
1923 /* Look at the cause of the stop, and decide what to do.
1924 The alternatives are:
1925 1) break; to really stop and return to the debugger,
1926 2) drop through to start up again
1927 (set ecs->stepping_over_breakpoint to 1 to single step once)
1928 3) set ecs->random_signal to 1, and the decision between 1 and 2
1929 will be made according to the signal handling tables. */
1931 /* First, distinguish signals caused by the debugger from signals
1932 that have to do with the program's own actions. Note that
1933 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1934 on the operating system version. Here we detect when a SIGILL or
1935 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1936 something similar for SIGSEGV, since a SIGSEGV will be generated
1937 when we're trying to execute a breakpoint instruction on a
1938 non-executable stack. This happens for call dummy breakpoints
1939 for architectures like SPARC that place call dummies on the
1942 if (stop_signal
== TARGET_SIGNAL_TRAP
1943 || (breakpoint_inserted_here_p (stop_pc
)
1944 && (stop_signal
== TARGET_SIGNAL_ILL
1945 || stop_signal
== TARGET_SIGNAL_SEGV
1946 || stop_signal
== TARGET_SIGNAL_EMT
))
1947 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
1948 || stop_soon
== STOP_QUIETLY_REMOTE
)
1950 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1953 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
1954 stop_print_frame
= 0;
1955 stop_stepping (ecs
);
1959 /* This is originated from start_remote(), start_inferior() and
1960 shared libraries hook functions. */
1961 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
1964 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
1965 stop_stepping (ecs
);
1969 /* This originates from attach_command(). We need to overwrite
1970 the stop_signal here, because some kernels don't ignore a
1971 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1972 See more comments in inferior.h. */
1973 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1975 stop_stepping (ecs
);
1976 if (stop_signal
== TARGET_SIGNAL_STOP
)
1977 stop_signal
= TARGET_SIGNAL_0
;
1981 /* See if there is a breakpoint at the current PC. */
1982 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1984 /* Following in case break condition called a
1986 stop_print_frame
= 1;
1988 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1989 at one stage in the past included checks for an inferior
1990 function call's call dummy's return breakpoint. The original
1991 comment, that went with the test, read:
1993 ``End of a stack dummy. Some systems (e.g. Sony news) give
1994 another signal besides SIGTRAP, so check here as well as
1997 If someone ever tries to get get call dummys on a
1998 non-executable stack to work (where the target would stop
1999 with something like a SIGSEGV), then those tests might need
2000 to be re-instated. Given, however, that the tests were only
2001 enabled when momentary breakpoints were not being used, I
2002 suspect that it won't be the case.
2004 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2005 be necessary for call dummies on a non-executable stack on
2008 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2010 = !(bpstat_explains_signal (stop_bpstat
)
2011 || stepping_over_breakpoint
2012 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2015 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
2016 if (!ecs
->random_signal
)
2017 stop_signal
= TARGET_SIGNAL_TRAP
;
2021 /* When we reach this point, we've pretty much decided
2022 that the reason for stopping must've been a random
2023 (unexpected) signal. */
2026 ecs
->random_signal
= 1;
2028 process_event_stop_test
:
2029 /* For the program's own signals, act according to
2030 the signal handling tables. */
2032 if (ecs
->random_signal
)
2034 /* Signal not for debugging purposes. */
2038 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
2040 stopped_by_random_signal
= 1;
2042 if (signal_print
[stop_signal
])
2045 target_terminal_ours_for_output ();
2046 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2048 if (signal_stop
[stop_signal
])
2050 stop_stepping (ecs
);
2053 /* If not going to stop, give terminal back
2054 if we took it away. */
2056 target_terminal_inferior ();
2058 /* Clear the signal if it should not be passed. */
2059 if (signal_program
[stop_signal
] == 0)
2060 stop_signal
= TARGET_SIGNAL_0
;
2062 if (prev_pc
== read_pc ()
2063 && breakpoint_here_p (read_pc ())
2064 && !breakpoint_inserted_here_p (read_pc ())
2065 && step_resume_breakpoint
== NULL
)
2067 /* We were just starting a new sequence, attempting to
2068 single-step off of a breakpoint and expecting a SIGTRAP.
2069 Intead this signal arrives. This signal will take us out
2070 of the stepping range so GDB needs to remember to, when
2071 the signal handler returns, resume stepping off that
2073 /* To simplify things, "continue" is forced to use the same
2074 code paths as single-step - set a breakpoint at the
2075 signal return address and then, once hit, step off that
2078 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2079 ecs
->step_after_step_resume_breakpoint
= 1;
2084 if (step_range_end
!= 0
2085 && stop_signal
!= TARGET_SIGNAL_0
2086 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
2087 && frame_id_eq (get_frame_id (get_current_frame ()),
2089 && step_resume_breakpoint
== NULL
)
2091 /* The inferior is about to take a signal that will take it
2092 out of the single step range. Set a breakpoint at the
2093 current PC (which is presumably where the signal handler
2094 will eventually return) and then allow the inferior to
2097 Note that this is only needed for a signal delivered
2098 while in the single-step range. Nested signals aren't a
2099 problem as they eventually all return. */
2100 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2105 /* Note: step_resume_breakpoint may be non-NULL. This occures
2106 when either there's a nested signal, or when there's a
2107 pending signal enabled just as the signal handler returns
2108 (leaving the inferior at the step-resume-breakpoint without
2109 actually executing it). Either way continue until the
2110 breakpoint is really hit. */
2115 /* Handle cases caused by hitting a breakpoint. */
2117 CORE_ADDR jmp_buf_pc
;
2118 struct bpstat_what what
;
2120 what
= bpstat_what (stop_bpstat
);
2122 if (what
.call_dummy
)
2124 stop_stack_dummy
= 1;
2127 switch (what
.main_action
)
2129 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2130 /* If we hit the breakpoint at longjmp, disable it for the
2131 duration of this command. Then, install a temporary
2132 breakpoint at the target of the jmp_buf. */
2134 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2135 disable_longjmp_breakpoint ();
2136 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
2137 || !gdbarch_get_longjmp_target (current_gdbarch
,
2138 get_current_frame (), &jmp_buf_pc
))
2144 /* Need to blow away step-resume breakpoint, as it
2145 interferes with us */
2146 if (step_resume_breakpoint
!= NULL
)
2148 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2151 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2152 ecs
->handling_longjmp
= 1; /* FIXME */
2156 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2157 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2159 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2160 disable_longjmp_breakpoint ();
2161 ecs
->handling_longjmp
= 0; /* FIXME */
2162 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2164 /* else fallthrough */
2166 case BPSTAT_WHAT_SINGLE
:
2168 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2169 ecs
->stepping_over_breakpoint
= 1;
2170 /* Still need to check other stuff, at least the case
2171 where we are stepping and step out of the right range. */
2174 case BPSTAT_WHAT_STOP_NOISY
:
2176 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2177 stop_print_frame
= 1;
2179 /* We are about to nuke the step_resume_breakpointt via the
2180 cleanup chain, so no need to worry about it here. */
2182 stop_stepping (ecs
);
2185 case BPSTAT_WHAT_STOP_SILENT
:
2187 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2188 stop_print_frame
= 0;
2190 /* We are about to nuke the step_resume_breakpoin via the
2191 cleanup chain, so no need to worry about it here. */
2193 stop_stepping (ecs
);
2196 case BPSTAT_WHAT_STEP_RESUME
:
2197 /* This proably demands a more elegant solution, but, yeah
2200 This function's use of the simple variable
2201 step_resume_breakpoint doesn't seem to accomodate
2202 simultaneously active step-resume bp's, although the
2203 breakpoint list certainly can.
2205 If we reach here and step_resume_breakpoint is already
2206 NULL, then apparently we have multiple active
2207 step-resume bp's. We'll just delete the breakpoint we
2208 stopped at, and carry on.
2210 Correction: what the code currently does is delete a
2211 step-resume bp, but it makes no effort to ensure that
2212 the one deleted is the one currently stopped at. MVS */
2215 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2217 if (step_resume_breakpoint
== NULL
)
2219 step_resume_breakpoint
=
2220 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2222 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2223 if (ecs
->step_after_step_resume_breakpoint
)
2225 /* Back when the step-resume breakpoint was inserted, we
2226 were trying to single-step off a breakpoint. Go back
2228 ecs
->step_after_step_resume_breakpoint
= 0;
2229 ecs
->stepping_over_breakpoint
= 1;
2235 case BPSTAT_WHAT_CHECK_SHLIBS
:
2236 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2239 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2240 /* Remove breakpoints, we eventually want to step over the
2241 shlib event breakpoint, and SOLIB_ADD might adjust
2242 breakpoint addresses via breakpoint_re_set. */
2243 remove_breakpoints ();
2245 /* Check for any newly added shared libraries if we're
2246 supposed to be adding them automatically. Switch
2247 terminal for any messages produced by
2248 breakpoint_re_set. */
2249 target_terminal_ours_for_output ();
2250 /* NOTE: cagney/2003-11-25: Make certain that the target
2251 stack's section table is kept up-to-date. Architectures,
2252 (e.g., PPC64), use the section table to perform
2253 operations such as address => section name and hence
2254 require the table to contain all sections (including
2255 those found in shared libraries). */
2256 /* NOTE: cagney/2003-11-25: Pass current_target and not
2257 exec_ops to SOLIB_ADD. This is because current GDB is
2258 only tooled to propagate section_table changes out from
2259 the "current_target" (see target_resize_to_sections), and
2260 not up from the exec stratum. This, of course, isn't
2261 right. "infrun.c" should only interact with the
2262 exec/process stratum, instead relying on the target stack
2263 to propagate relevant changes (stop, section table
2264 changed, ...) up to other layers. */
2266 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2268 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2270 target_terminal_inferior ();
2272 /* If requested, stop when the dynamic linker notifies
2273 gdb of events. This allows the user to get control
2274 and place breakpoints in initializer routines for
2275 dynamically loaded objects (among other things). */
2276 if (stop_on_solib_events
|| stop_stack_dummy
)
2278 stop_stepping (ecs
);
2282 /* If we stopped due to an explicit catchpoint, then the
2283 (see above) call to SOLIB_ADD pulled in any symbols
2284 from a newly-loaded library, if appropriate.
2286 We do want the inferior to stop, but not where it is
2287 now, which is in the dynamic linker callback. Rather,
2288 we would like it stop in the user's program, just after
2289 the call that caused this catchpoint to trigger. That
2290 gives the user a more useful vantage from which to
2291 examine their program's state. */
2292 else if (what
.main_action
2293 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2295 /* ??rehrauer: If I could figure out how to get the
2296 right return PC from here, we could just set a temp
2297 breakpoint and resume. I'm not sure we can without
2298 cracking open the dld's shared libraries and sniffing
2299 their unwind tables and text/data ranges, and that's
2300 not a terribly portable notion.
2302 Until that time, we must step the inferior out of the
2303 dld callback, and also out of the dld itself (and any
2304 code or stubs in libdld.sl, such as "shl_load" and
2305 friends) until we reach non-dld code. At that point,
2306 we can stop stepping. */
2307 bpstat_get_triggered_catchpoints (stop_bpstat
,
2309 stepping_through_solib_catchpoints
);
2310 ecs
->stepping_through_solib_after_catch
= 1;
2312 /* Be sure to lift all breakpoints, so the inferior does
2313 actually step past this point... */
2314 ecs
->stepping_over_breakpoint
= 1;
2319 /* We want to step over this breakpoint, then keep going. */
2320 ecs
->stepping_over_breakpoint
= 1;
2326 case BPSTAT_WHAT_LAST
:
2327 /* Not a real code, but listed here to shut up gcc -Wall. */
2329 case BPSTAT_WHAT_KEEP_CHECKING
:
2334 /* We come here if we hit a breakpoint but should not
2335 stop for it. Possibly we also were stepping
2336 and should stop for that. So fall through and
2337 test for stepping. But, if not stepping,
2340 /* Are we stepping to get the inferior out of the dynamic linker's
2341 hook (and possibly the dld itself) after catching a shlib
2343 if (ecs
->stepping_through_solib_after_catch
)
2345 #if defined(SOLIB_ADD)
2346 /* Have we reached our destination? If not, keep going. */
2347 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2350 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2351 ecs
->stepping_over_breakpoint
= 1;
2357 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2358 /* Else, stop and report the catchpoint(s) whose triggering
2359 caused us to begin stepping. */
2360 ecs
->stepping_through_solib_after_catch
= 0;
2361 bpstat_clear (&stop_bpstat
);
2362 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2363 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2364 stop_print_frame
= 1;
2365 stop_stepping (ecs
);
2369 if (step_resume_breakpoint
)
2372 fprintf_unfiltered (gdb_stdlog
,
2373 "infrun: step-resume breakpoint is inserted\n");
2375 /* Having a step-resume breakpoint overrides anything
2376 else having to do with stepping commands until
2377 that breakpoint is reached. */
2382 if (step_range_end
== 0)
2385 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
2386 /* Likewise if we aren't even stepping. */
2391 /* If stepping through a line, keep going if still within it.
2393 Note that step_range_end is the address of the first instruction
2394 beyond the step range, and NOT the address of the last instruction
2396 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2399 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
2400 paddr_nz (step_range_start
),
2401 paddr_nz (step_range_end
));
2406 /* We stepped out of the stepping range. */
2408 /* If we are stepping at the source level and entered the runtime
2409 loader dynamic symbol resolution code, we keep on single stepping
2410 until we exit the run time loader code and reach the callee's
2412 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2413 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2414 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
)
2416 && in_solib_dynsym_resolve_code (stop_pc
)
2420 CORE_ADDR pc_after_resolver
=
2421 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2424 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
2426 if (pc_after_resolver
)
2428 /* Set up a step-resume breakpoint at the address
2429 indicated by SKIP_SOLIB_RESOLVER. */
2430 struct symtab_and_line sr_sal
;
2432 sr_sal
.pc
= pc_after_resolver
;
2434 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2441 if (step_range_end
!= 1
2442 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2443 || step_over_calls
== STEP_OVER_ALL
)
2444 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2447 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
2448 /* The inferior, while doing a "step" or "next", has ended up in
2449 a signal trampoline (either by a signal being delivered or by
2450 the signal handler returning). Just single-step until the
2451 inferior leaves the trampoline (either by calling the handler
2457 /* Check for subroutine calls. The check for the current frame
2458 equalling the step ID is not necessary - the check of the
2459 previous frame's ID is sufficient - but it is a common case and
2460 cheaper than checking the previous frame's ID.
2462 NOTE: frame_id_eq will never report two invalid frame IDs as
2463 being equal, so to get into this block, both the current and
2464 previous frame must have valid frame IDs. */
2465 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
)
2466 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2468 CORE_ADDR real_stop_pc
;
2471 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
2473 if ((step_over_calls
== STEP_OVER_NONE
)
2474 || ((step_range_end
== 1)
2475 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2477 /* I presume that step_over_calls is only 0 when we're
2478 supposed to be stepping at the assembly language level
2479 ("stepi"). Just stop. */
2480 /* Also, maybe we just did a "nexti" inside a prolog, so we
2481 thought it was a subroutine call but it was not. Stop as
2484 print_stop_reason (END_STEPPING_RANGE
, 0);
2485 stop_stepping (ecs
);
2489 if (step_over_calls
== STEP_OVER_ALL
)
2491 /* We're doing a "next", set a breakpoint at callee's return
2492 address (the address at which the caller will
2494 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2499 /* If we are in a function call trampoline (a stub between the
2500 calling routine and the real function), locate the real
2501 function. That's what tells us (a) whether we want to step
2502 into it at all, and (b) what prologue we want to run to the
2503 end of, if we do step into it. */
2504 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
2505 if (real_stop_pc
== 0)
2506 real_stop_pc
= gdbarch_skip_trampoline_code
2507 (current_gdbarch
, get_current_frame (), stop_pc
);
2508 if (real_stop_pc
!= 0)
2509 ecs
->stop_func_start
= real_stop_pc
;
2512 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2513 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
)
2515 in_solib_dynsym_resolve_code (ecs
->stop_func_start
)
2519 struct symtab_and_line sr_sal
;
2521 sr_sal
.pc
= ecs
->stop_func_start
;
2523 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2528 /* If we have line number information for the function we are
2529 thinking of stepping into, step into it.
2531 If there are several symtabs at that PC (e.g. with include
2532 files), just want to know whether *any* of them have line
2533 numbers. find_pc_line handles this. */
2535 struct symtab_and_line tmp_sal
;
2537 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2538 if (tmp_sal
.line
!= 0)
2540 step_into_function (ecs
);
2545 /* If we have no line number and the step-stop-if-no-debug is
2546 set, we stop the step so that the user has a chance to switch
2547 in assembly mode. */
2548 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2551 print_stop_reason (END_STEPPING_RANGE
, 0);
2552 stop_stepping (ecs
);
2556 /* Set a breakpoint at callee's return address (the address at
2557 which the caller will resume). */
2558 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2563 /* If we're in the return path from a shared library trampoline,
2564 we want to proceed through the trampoline when stepping. */
2565 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
2566 stop_pc
, ecs
->stop_func_name
))
2568 /* Determine where this trampoline returns. */
2569 CORE_ADDR real_stop_pc
;
2570 real_stop_pc
= gdbarch_skip_trampoline_code
2571 (current_gdbarch
, get_current_frame (), stop_pc
);
2574 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
2576 /* Only proceed through if we know where it's going. */
2579 /* And put the step-breakpoint there and go until there. */
2580 struct symtab_and_line sr_sal
;
2582 init_sal (&sr_sal
); /* initialize to zeroes */
2583 sr_sal
.pc
= real_stop_pc
;
2584 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2586 /* Do not specify what the fp should be when we stop since
2587 on some machines the prologue is where the new fp value
2589 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2591 /* Restart without fiddling with the step ranges or
2598 ecs
->sal
= find_pc_line (stop_pc
, 0);
2600 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2601 the trampoline processing logic, however, there are some trampolines
2602 that have no names, so we should do trampoline handling first. */
2603 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2604 && ecs
->stop_func_name
== NULL
2605 && ecs
->sal
.line
== 0)
2608 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
2610 /* The inferior just stepped into, or returned to, an
2611 undebuggable function (where there is no debugging information
2612 and no line number corresponding to the address where the
2613 inferior stopped). Since we want to skip this kind of code,
2614 we keep going until the inferior returns from this
2615 function - unless the user has asked us not to (via
2616 set step-mode) or we no longer know how to get back
2617 to the call site. */
2618 if (step_stop_if_no_debug
2619 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2621 /* If we have no line number and the step-stop-if-no-debug
2622 is set, we stop the step so that the user has a chance to
2623 switch in assembly mode. */
2625 print_stop_reason (END_STEPPING_RANGE
, 0);
2626 stop_stepping (ecs
);
2631 /* Set a breakpoint at callee's return address (the address
2632 at which the caller will resume). */
2633 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2639 if (step_range_end
== 1)
2641 /* It is stepi or nexti. We always want to stop stepping after
2644 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
2646 print_stop_reason (END_STEPPING_RANGE
, 0);
2647 stop_stepping (ecs
);
2651 if (ecs
->sal
.line
== 0)
2653 /* We have no line number information. That means to stop
2654 stepping (does this always happen right after one instruction,
2655 when we do "s" in a function with no line numbers,
2656 or can this happen as a result of a return or longjmp?). */
2658 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
2660 print_stop_reason (END_STEPPING_RANGE
, 0);
2661 stop_stepping (ecs
);
2665 if ((stop_pc
== ecs
->sal
.pc
)
2666 && (ecs
->current_line
!= ecs
->sal
.line
2667 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2669 /* We are at the start of a different line. So stop. Note that
2670 we don't stop if we step into the middle of a different line.
2671 That is said to make things like for (;;) statements work
2674 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
2676 print_stop_reason (END_STEPPING_RANGE
, 0);
2677 stop_stepping (ecs
);
2681 /* We aren't done stepping.
2683 Optimize by setting the stepping range to the line.
2684 (We might not be in the original line, but if we entered a
2685 new line in mid-statement, we continue stepping. This makes
2686 things like for(;;) statements work better.) */
2688 step_range_start
= ecs
->sal
.pc
;
2689 step_range_end
= ecs
->sal
.end
;
2690 step_frame_id
= get_frame_id (get_current_frame ());
2691 ecs
->current_line
= ecs
->sal
.line
;
2692 ecs
->current_symtab
= ecs
->sal
.symtab
;
2694 /* In the case where we just stepped out of a function into the
2695 middle of a line of the caller, continue stepping, but
2696 step_frame_id must be modified to current frame */
2698 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2699 generous. It will trigger on things like a step into a frameless
2700 stackless leaf function. I think the logic should instead look
2701 at the unwound frame ID has that should give a more robust
2702 indication of what happened. */
2703 if (step
- ID
== current
- ID
)
2704 still stepping in same function
;
2705 else if (step
- ID
== unwind (current
- ID
))
2706 stepped into a function
;
2708 stepped out of a function
;
2709 /* Of course this assumes that the frame ID unwind code is robust
2710 and we're willing to introduce frame unwind logic into this
2711 function. Fortunately, those days are nearly upon us. */
2714 struct frame_info
*frame
= get_current_frame ();
2715 struct frame_id current_frame
= get_frame_id (frame
);
2716 if (!(frame_id_inner (get_frame_arch (frame
), current_frame
,
2718 step_frame_id
= current_frame
;
2722 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
2726 /* Are we in the middle of stepping? */
2729 currently_stepping (struct execution_control_state
*ecs
)
2731 return ((!ecs
->handling_longjmp
2732 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2733 || stepping_over_breakpoint
))
2734 || ecs
->stepping_through_solib_after_catch
2735 || bpstat_should_step ());
2738 /* Subroutine call with source code we should not step over. Do step
2739 to the first line of code in it. */
2742 step_into_function (struct execution_control_state
*ecs
)
2745 struct symtab_and_line sr_sal
;
2747 s
= find_pc_symtab (stop_pc
);
2748 if (s
&& s
->language
!= language_asm
)
2749 ecs
->stop_func_start
= gdbarch_skip_prologue
2750 (current_gdbarch
, ecs
->stop_func_start
);
2752 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2753 /* Use the step_resume_break to step until the end of the prologue,
2754 even if that involves jumps (as it seems to on the vax under
2756 /* If the prologue ends in the middle of a source line, continue to
2757 the end of that source line (if it is still within the function).
2758 Otherwise, just go to end of prologue. */
2760 && ecs
->sal
.pc
!= ecs
->stop_func_start
2761 && ecs
->sal
.end
< ecs
->stop_func_end
)
2762 ecs
->stop_func_start
= ecs
->sal
.end
;
2764 /* Architectures which require breakpoint adjustment might not be able
2765 to place a breakpoint at the computed address. If so, the test
2766 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2767 ecs->stop_func_start to an address at which a breakpoint may be
2768 legitimately placed.
2770 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2771 made, GDB will enter an infinite loop when stepping through
2772 optimized code consisting of VLIW instructions which contain
2773 subinstructions corresponding to different source lines. On
2774 FR-V, it's not permitted to place a breakpoint on any but the
2775 first subinstruction of a VLIW instruction. When a breakpoint is
2776 set, GDB will adjust the breakpoint address to the beginning of
2777 the VLIW instruction. Thus, we need to make the corresponding
2778 adjustment here when computing the stop address. */
2780 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2782 ecs
->stop_func_start
2783 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2784 ecs
->stop_func_start
);
2787 if (ecs
->stop_func_start
== stop_pc
)
2789 /* We are already there: stop now. */
2791 print_stop_reason (END_STEPPING_RANGE
, 0);
2792 stop_stepping (ecs
);
2797 /* Put the step-breakpoint there and go until there. */
2798 init_sal (&sr_sal
); /* initialize to zeroes */
2799 sr_sal
.pc
= ecs
->stop_func_start
;
2800 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2802 /* Do not specify what the fp should be when we stop since on
2803 some machines the prologue is where the new fp value is
2805 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2807 /* And make sure stepping stops right away then. */
2808 step_range_end
= step_range_start
;
2813 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
2814 This is used to both functions and to skip over code. */
2817 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
2818 struct frame_id sr_id
)
2820 /* There should never be more than one step-resume breakpoint per
2821 thread, so we should never be setting a new
2822 step_resume_breakpoint when one is already active. */
2823 gdb_assert (step_resume_breakpoint
== NULL
);
2826 fprintf_unfiltered (gdb_stdlog
,
2827 "infrun: inserting step-resume breakpoint at 0x%s\n",
2828 paddr_nz (sr_sal
.pc
));
2830 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
2834 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
2835 to skip a potential signal handler.
2837 This is called with the interrupted function's frame. The signal
2838 handler, when it returns, will resume the interrupted function at
2842 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
2844 struct symtab_and_line sr_sal
;
2846 gdb_assert (return_frame
!= NULL
);
2847 init_sal (&sr_sal
); /* initialize to zeros */
2849 sr_sal
.pc
= gdbarch_addr_bits_remove
2850 (current_gdbarch
, get_frame_pc (return_frame
));
2851 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2853 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
2856 /* Similar to insert_step_resume_breakpoint_at_frame, except
2857 but a breakpoint at the previous frame's PC. This is used to
2858 skip a function after stepping into it (for "next" or if the called
2859 function has no debugging information).
2861 The current function has almost always been reached by single
2862 stepping a call or return instruction. NEXT_FRAME belongs to the
2863 current function, and the breakpoint will be set at the caller's
2866 This is a separate function rather than reusing
2867 insert_step_resume_breakpoint_at_frame in order to avoid
2868 get_prev_frame, which may stop prematurely (see the implementation
2869 of frame_unwind_id for an example). */
2872 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
2874 struct symtab_and_line sr_sal
;
2876 /* We shouldn't have gotten here if we don't know where the call site
2878 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
2880 init_sal (&sr_sal
); /* initialize to zeros */
2882 sr_sal
.pc
= gdbarch_addr_bits_remove
2883 (current_gdbarch
, frame_pc_unwind (next_frame
));
2884 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2886 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
2890 stop_stepping (struct execution_control_state
*ecs
)
2893 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
2895 /* Let callers know we don't want to wait for the inferior anymore. */
2896 ecs
->wait_some_more
= 0;
2899 /* This function handles various cases where we need to continue
2900 waiting for the inferior. */
2901 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2904 keep_going (struct execution_control_state
*ecs
)
2906 /* Save the pc before execution, to compare with pc after stop. */
2907 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2909 /* If we did not do break;, it means we should keep running the
2910 inferior and not return to debugger. */
2912 if (stepping_over_breakpoint
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2914 /* We took a signal (which we are supposed to pass through to
2915 the inferior, else we'd have done a break above) and we
2916 haven't yet gotten our trap. Simply continue. */
2917 resume (currently_stepping (ecs
), stop_signal
);
2921 /* Either the trap was not expected, but we are continuing
2922 anyway (the user asked that this signal be passed to the
2925 The signal was SIGTRAP, e.g. it was our signal, but we
2926 decided we should resume from it.
2928 We're going to run this baby now!
2930 Note that insert_breakpoints won't try to re-insert
2931 already inserted breakpoints. Therefore, we don't
2932 care if breakpoints were already inserted, or not. */
2934 if (ecs
->stepping_over_breakpoint
)
2936 remove_breakpoints ();
2940 struct gdb_exception e
;
2941 /* Stop stepping when inserting breakpoints
2943 TRY_CATCH (e
, RETURN_MASK_ERROR
)
2945 insert_breakpoints ();
2949 stop_stepping (ecs
);
2954 stepping_over_breakpoint
= ecs
->stepping_over_breakpoint
;
2956 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2957 specifies that such a signal should be delivered to the
2960 Typically, this would occure when a user is debugging a
2961 target monitor on a simulator: the target monitor sets a
2962 breakpoint; the simulator encounters this break-point and
2963 halts the simulation handing control to GDB; GDB, noteing
2964 that the break-point isn't valid, returns control back to the
2965 simulator; the simulator then delivers the hardware
2966 equivalent of a SIGNAL_TRAP to the program being debugged. */
2968 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2969 stop_signal
= TARGET_SIGNAL_0
;
2972 resume (currently_stepping (ecs
), stop_signal
);
2975 prepare_to_wait (ecs
);
2978 /* This function normally comes after a resume, before
2979 handle_inferior_event exits. It takes care of any last bits of
2980 housekeeping, and sets the all-important wait_some_more flag. */
2983 prepare_to_wait (struct execution_control_state
*ecs
)
2986 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
2987 if (ecs
->infwait_state
== infwait_normal_state
)
2989 overlay_cache_invalid
= 1;
2991 /* We have to invalidate the registers BEFORE calling
2992 target_wait because they can be loaded from the target while
2993 in target_wait. This makes remote debugging a bit more
2994 efficient for those targets that provide critical registers
2995 as part of their normal status mechanism. */
2997 registers_changed ();
2998 ecs
->waiton_ptid
= pid_to_ptid (-1);
2999 ecs
->wp
= &(ecs
->ws
);
3001 /* This is the old end of the while loop. Let everybody know we
3002 want to wait for the inferior some more and get called again
3004 ecs
->wait_some_more
= 1;
3007 /* Print why the inferior has stopped. We always print something when
3008 the inferior exits, or receives a signal. The rest of the cases are
3009 dealt with later on in normal_stop() and print_it_typical(). Ideally
3010 there should be a call to this function from handle_inferior_event()
3011 each time stop_stepping() is called.*/
3013 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3015 switch (stop_reason
)
3017 case END_STEPPING_RANGE
:
3018 /* We are done with a step/next/si/ni command. */
3019 /* For now print nothing. */
3020 /* Print a message only if not in the middle of doing a "step n"
3021 operation for n > 1 */
3022 if (!step_multi
|| !stop_step
)
3023 if (ui_out_is_mi_like_p (uiout
))
3026 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
3029 /* The inferior was terminated by a signal. */
3030 annotate_signalled ();
3031 if (ui_out_is_mi_like_p (uiout
))
3034 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
3035 ui_out_text (uiout
, "\nProgram terminated with signal ");
3036 annotate_signal_name ();
3037 ui_out_field_string (uiout
, "signal-name",
3038 target_signal_to_name (stop_info
));
3039 annotate_signal_name_end ();
3040 ui_out_text (uiout
, ", ");
3041 annotate_signal_string ();
3042 ui_out_field_string (uiout
, "signal-meaning",
3043 target_signal_to_string (stop_info
));
3044 annotate_signal_string_end ();
3045 ui_out_text (uiout
, ".\n");
3046 ui_out_text (uiout
, "The program no longer exists.\n");
3049 /* The inferior program is finished. */
3050 annotate_exited (stop_info
);
3053 if (ui_out_is_mi_like_p (uiout
))
3054 ui_out_field_string (uiout
, "reason",
3055 async_reason_lookup (EXEC_ASYNC_EXITED
));
3056 ui_out_text (uiout
, "\nProgram exited with code ");
3057 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3058 (unsigned int) stop_info
);
3059 ui_out_text (uiout
, ".\n");
3063 if (ui_out_is_mi_like_p (uiout
))
3066 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
3067 ui_out_text (uiout
, "\nProgram exited normally.\n");
3069 /* Support the --return-child-result option. */
3070 return_child_result_value
= stop_info
;
3072 case SIGNAL_RECEIVED
:
3073 /* Signal received. The signal table tells us to print about
3076 ui_out_text (uiout
, "\nProgram received signal ");
3077 annotate_signal_name ();
3078 if (ui_out_is_mi_like_p (uiout
))
3080 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3081 ui_out_field_string (uiout
, "signal-name",
3082 target_signal_to_name (stop_info
));
3083 annotate_signal_name_end ();
3084 ui_out_text (uiout
, ", ");
3085 annotate_signal_string ();
3086 ui_out_field_string (uiout
, "signal-meaning",
3087 target_signal_to_string (stop_info
));
3088 annotate_signal_string_end ();
3089 ui_out_text (uiout
, ".\n");
3092 internal_error (__FILE__
, __LINE__
,
3093 _("print_stop_reason: unrecognized enum value"));
3099 /* Here to return control to GDB when the inferior stops for real.
3100 Print appropriate messages, remove breakpoints, give terminal our modes.
3102 STOP_PRINT_FRAME nonzero means print the executing frame
3103 (pc, function, args, file, line number and line text).
3104 BREAKPOINTS_FAILED nonzero means stop was due to error
3105 attempting to insert breakpoints. */
3110 struct target_waitstatus last
;
3113 get_last_target_status (&last_ptid
, &last
);
3115 /* As with the notification of thread events, we want to delay
3116 notifying the user that we've switched thread context until
3117 the inferior actually stops.
3119 There's no point in saying anything if the inferior has exited.
3120 Note that SIGNALLED here means "exited with a signal", not
3121 "received a signal". */
3122 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3123 && target_has_execution
3124 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3125 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3127 target_terminal_ours_for_output ();
3128 printf_filtered (_("[Switching to %s]\n"),
3129 target_pid_to_str (inferior_ptid
));
3130 previous_inferior_ptid
= inferior_ptid
;
3133 /* NOTE drow/2004-01-17: Is this still necessary? */
3134 /* Make sure that the current_frame's pc is correct. This
3135 is a correction for setting up the frame info before doing
3136 gdbarch_decr_pc_after_break */
3137 if (target_has_execution
)
3138 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3139 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3140 frame code to check for this and sort out any resultant mess.
3141 gdbarch_decr_pc_after_break needs to just go away. */
3142 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3144 if (target_has_execution
)
3146 if (remove_breakpoints ())
3148 target_terminal_ours_for_output ();
3149 printf_filtered (_("\
3150 Cannot remove breakpoints because program is no longer writable.\n\
3151 It might be running in another process.\n\
3152 Further execution is probably impossible.\n"));
3156 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3157 Delete any breakpoint that is to be deleted at the next stop. */
3159 breakpoint_auto_delete (stop_bpstat
);
3161 /* If an auto-display called a function and that got a signal,
3162 delete that auto-display to avoid an infinite recursion. */
3164 if (stopped_by_random_signal
)
3165 disable_current_display ();
3167 /* Don't print a message if in the middle of doing a "step n"
3168 operation for n > 1 */
3169 if (step_multi
&& stop_step
)
3172 target_terminal_ours ();
3174 /* Set the current source location. This will also happen if we
3175 display the frame below, but the current SAL will be incorrect
3176 during a user hook-stop function. */
3177 if (target_has_stack
&& !stop_stack_dummy
)
3178 set_current_sal_from_frame (get_current_frame (), 1);
3180 /* Look up the hook_stop and run it (CLI internally handles problem
3181 of stop_command's pre-hook not existing). */
3183 catch_errors (hook_stop_stub
, stop_command
,
3184 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3186 if (!target_has_stack
)
3192 /* Select innermost stack frame - i.e., current frame is frame 0,
3193 and current location is based on that.
3194 Don't do this on return from a stack dummy routine,
3195 or if the program has exited. */
3197 if (!stop_stack_dummy
)
3199 select_frame (get_current_frame ());
3201 /* Print current location without a level number, if
3202 we have changed functions or hit a breakpoint.
3203 Print source line if we have one.
3204 bpstat_print() contains the logic deciding in detail
3205 what to print, based on the event(s) that just occurred. */
3207 if (stop_print_frame
)
3211 int do_frame_printing
= 1;
3213 bpstat_ret
= bpstat_print (stop_bpstat
);
3217 /* If we had hit a shared library event breakpoint,
3218 bpstat_print would print out this message. If we hit
3219 an OS-level shared library event, do the same
3221 if (last
.kind
== TARGET_WAITKIND_LOADED
)
3223 printf_filtered (_("Stopped due to shared library event\n"));
3224 source_flag
= SRC_LINE
; /* something bogus */
3225 do_frame_printing
= 0;
3229 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3230 (or should) carry around the function and does (or
3231 should) use that when doing a frame comparison. */
3233 && frame_id_eq (step_frame_id
,
3234 get_frame_id (get_current_frame ()))
3235 && step_start_function
== find_pc_function (stop_pc
))
3236 source_flag
= SRC_LINE
; /* finished step, just print source line */
3238 source_flag
= SRC_AND_LOC
; /* print location and source line */
3240 case PRINT_SRC_AND_LOC
:
3241 source_flag
= SRC_AND_LOC
; /* print location and source line */
3243 case PRINT_SRC_ONLY
:
3244 source_flag
= SRC_LINE
;
3247 source_flag
= SRC_LINE
; /* something bogus */
3248 do_frame_printing
= 0;
3251 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3254 if (ui_out_is_mi_like_p (uiout
))
3255 ui_out_field_int (uiout
, "thread-id",
3256 pid_to_thread_id (inferior_ptid
));
3257 /* The behavior of this routine with respect to the source
3259 SRC_LINE: Print only source line
3260 LOCATION: Print only location
3261 SRC_AND_LOC: Print location and source line */
3262 if (do_frame_printing
)
3263 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3265 /* Display the auto-display expressions. */
3270 /* Save the function value return registers, if we care.
3271 We might be about to restore their previous contents. */
3272 if (proceed_to_finish
)
3274 /* This should not be necessary. */
3276 regcache_xfree (stop_registers
);
3278 /* NB: The copy goes through to the target picking up the value of
3279 all the registers. */
3280 stop_registers
= regcache_dup (get_current_regcache ());
3283 if (stop_stack_dummy
)
3285 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3286 ends with a setting of the current frame, so we can use that
3288 frame_pop (get_current_frame ());
3289 /* Set stop_pc to what it was before we called the function.
3290 Can't rely on restore_inferior_status because that only gets
3291 called if we don't stop in the called function. */
3292 stop_pc
= read_pc ();
3293 select_frame (get_current_frame ());
3297 annotate_stopped ();
3298 observer_notify_normal_stop (stop_bpstat
);
3302 hook_stop_stub (void *cmd
)
3304 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3309 signal_stop_state (int signo
)
3311 return signal_stop
[signo
];
3315 signal_print_state (int signo
)
3317 return signal_print
[signo
];
3321 signal_pass_state (int signo
)
3323 return signal_program
[signo
];
3327 signal_stop_update (int signo
, int state
)
3329 int ret
= signal_stop
[signo
];
3330 signal_stop
[signo
] = state
;
3335 signal_print_update (int signo
, int state
)
3337 int ret
= signal_print
[signo
];
3338 signal_print
[signo
] = state
;
3343 signal_pass_update (int signo
, int state
)
3345 int ret
= signal_program
[signo
];
3346 signal_program
[signo
] = state
;
3351 sig_print_header (void)
3353 printf_filtered (_("\
3354 Signal Stop\tPrint\tPass to program\tDescription\n"));
3358 sig_print_info (enum target_signal oursig
)
3360 char *name
= target_signal_to_name (oursig
);
3361 int name_padding
= 13 - strlen (name
);
3363 if (name_padding
<= 0)
3366 printf_filtered ("%s", name
);
3367 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3368 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3369 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3370 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3371 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3374 /* Specify how various signals in the inferior should be handled. */
3377 handle_command (char *args
, int from_tty
)
3380 int digits
, wordlen
;
3381 int sigfirst
, signum
, siglast
;
3382 enum target_signal oursig
;
3385 unsigned char *sigs
;
3386 struct cleanup
*old_chain
;
3390 error_no_arg (_("signal to handle"));
3393 /* Allocate and zero an array of flags for which signals to handle. */
3395 nsigs
= (int) TARGET_SIGNAL_LAST
;
3396 sigs
= (unsigned char *) alloca (nsigs
);
3397 memset (sigs
, 0, nsigs
);
3399 /* Break the command line up into args. */
3401 argv
= buildargv (args
);
3406 old_chain
= make_cleanup_freeargv (argv
);
3408 /* Walk through the args, looking for signal oursigs, signal names, and
3409 actions. Signal numbers and signal names may be interspersed with
3410 actions, with the actions being performed for all signals cumulatively
3411 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3413 while (*argv
!= NULL
)
3415 wordlen
= strlen (*argv
);
3416 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3420 sigfirst
= siglast
= -1;
3422 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3424 /* Apply action to all signals except those used by the
3425 debugger. Silently skip those. */
3428 siglast
= nsigs
- 1;
3430 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3432 SET_SIGS (nsigs
, sigs
, signal_stop
);
3433 SET_SIGS (nsigs
, sigs
, signal_print
);
3435 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3437 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3439 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3441 SET_SIGS (nsigs
, sigs
, signal_print
);
3443 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3445 SET_SIGS (nsigs
, sigs
, signal_program
);
3447 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3449 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3451 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3453 SET_SIGS (nsigs
, sigs
, signal_program
);
3455 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3457 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3458 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3460 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3462 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3464 else if (digits
> 0)
3466 /* It is numeric. The numeric signal refers to our own
3467 internal signal numbering from target.h, not to host/target
3468 signal number. This is a feature; users really should be
3469 using symbolic names anyway, and the common ones like
3470 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3472 sigfirst
= siglast
= (int)
3473 target_signal_from_command (atoi (*argv
));
3474 if ((*argv
)[digits
] == '-')
3477 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3479 if (sigfirst
> siglast
)
3481 /* Bet he didn't figure we'd think of this case... */
3489 oursig
= target_signal_from_name (*argv
);
3490 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3492 sigfirst
= siglast
= (int) oursig
;
3496 /* Not a number and not a recognized flag word => complain. */
3497 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
3501 /* If any signal numbers or symbol names were found, set flags for
3502 which signals to apply actions to. */
3504 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3506 switch ((enum target_signal
) signum
)
3508 case TARGET_SIGNAL_TRAP
:
3509 case TARGET_SIGNAL_INT
:
3510 if (!allsigs
&& !sigs
[signum
])
3512 if (query ("%s is used by the debugger.\n\
3513 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3519 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3520 gdb_flush (gdb_stdout
);
3524 case TARGET_SIGNAL_0
:
3525 case TARGET_SIGNAL_DEFAULT
:
3526 case TARGET_SIGNAL_UNKNOWN
:
3527 /* Make sure that "all" doesn't print these. */
3538 target_notice_signals (inferior_ptid
);
3542 /* Show the results. */
3543 sig_print_header ();
3544 for (signum
= 0; signum
< nsigs
; signum
++)
3548 sig_print_info (signum
);
3553 do_cleanups (old_chain
);
3557 xdb_handle_command (char *args
, int from_tty
)
3560 struct cleanup
*old_chain
;
3562 /* Break the command line up into args. */
3564 argv
= buildargv (args
);
3569 old_chain
= make_cleanup_freeargv (argv
);
3570 if (argv
[1] != (char *) NULL
)
3575 bufLen
= strlen (argv
[0]) + 20;
3576 argBuf
= (char *) xmalloc (bufLen
);
3580 enum target_signal oursig
;
3582 oursig
= target_signal_from_name (argv
[0]);
3583 memset (argBuf
, 0, bufLen
);
3584 if (strcmp (argv
[1], "Q") == 0)
3585 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3588 if (strcmp (argv
[1], "s") == 0)
3590 if (!signal_stop
[oursig
])
3591 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3593 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3595 else if (strcmp (argv
[1], "i") == 0)
3597 if (!signal_program
[oursig
])
3598 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3600 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3602 else if (strcmp (argv
[1], "r") == 0)
3604 if (!signal_print
[oursig
])
3605 sprintf (argBuf
, "%s %s", argv
[0], "print");
3607 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3613 handle_command (argBuf
, from_tty
);
3615 printf_filtered (_("Invalid signal handling flag.\n"));
3620 do_cleanups (old_chain
);
3623 /* Print current contents of the tables set by the handle command.
3624 It is possible we should just be printing signals actually used
3625 by the current target (but for things to work right when switching
3626 targets, all signals should be in the signal tables). */
3629 signals_info (char *signum_exp
, int from_tty
)
3631 enum target_signal oursig
;
3632 sig_print_header ();
3636 /* First see if this is a symbol name. */
3637 oursig
= target_signal_from_name (signum_exp
);
3638 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3640 /* No, try numeric. */
3642 target_signal_from_command (parse_and_eval_long (signum_exp
));
3644 sig_print_info (oursig
);
3648 printf_filtered ("\n");
3649 /* These ugly casts brought to you by the native VAX compiler. */
3650 for (oursig
= TARGET_SIGNAL_FIRST
;
3651 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3652 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3656 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3657 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3658 sig_print_info (oursig
);
3661 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3664 struct inferior_status
3666 enum target_signal stop_signal
;
3670 int stop_stack_dummy
;
3671 int stopped_by_random_signal
;
3672 int stepping_over_breakpoint
;
3673 CORE_ADDR step_range_start
;
3674 CORE_ADDR step_range_end
;
3675 struct frame_id step_frame_id
;
3676 enum step_over_calls_kind step_over_calls
;
3677 CORE_ADDR step_resume_break_address
;
3678 int stop_after_trap
;
3681 /* These are here because if call_function_by_hand has written some
3682 registers and then decides to call error(), we better not have changed
3684 struct regcache
*registers
;
3686 /* A frame unique identifier. */
3687 struct frame_id selected_frame_id
;
3689 int breakpoint_proceeded
;
3690 int restore_stack_info
;
3691 int proceed_to_finish
;
3695 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3698 int size
= register_size (current_gdbarch
, regno
);
3699 void *buf
= alloca (size
);
3700 store_signed_integer (buf
, size
, val
);
3701 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3704 /* Save all of the information associated with the inferior<==>gdb
3705 connection. INF_STATUS is a pointer to a "struct inferior_status"
3706 (defined in inferior.h). */
3708 struct inferior_status
*
3709 save_inferior_status (int restore_stack_info
)
3711 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3713 inf_status
->stop_signal
= stop_signal
;
3714 inf_status
->stop_pc
= stop_pc
;
3715 inf_status
->stop_step
= stop_step
;
3716 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3717 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3718 inf_status
->stepping_over_breakpoint
= stepping_over_breakpoint
;
3719 inf_status
->step_range_start
= step_range_start
;
3720 inf_status
->step_range_end
= step_range_end
;
3721 inf_status
->step_frame_id
= step_frame_id
;
3722 inf_status
->step_over_calls
= step_over_calls
;
3723 inf_status
->stop_after_trap
= stop_after_trap
;
3724 inf_status
->stop_soon
= stop_soon
;
3725 /* Save original bpstat chain here; replace it with copy of chain.
3726 If caller's caller is walking the chain, they'll be happier if we
3727 hand them back the original chain when restore_inferior_status is
3729 inf_status
->stop_bpstat
= stop_bpstat
;
3730 stop_bpstat
= bpstat_copy (stop_bpstat
);
3731 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3732 inf_status
->restore_stack_info
= restore_stack_info
;
3733 inf_status
->proceed_to_finish
= proceed_to_finish
;
3735 inf_status
->registers
= regcache_dup (get_current_regcache ());
3737 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
3742 restore_selected_frame (void *args
)
3744 struct frame_id
*fid
= (struct frame_id
*) args
;
3745 struct frame_info
*frame
;
3747 frame
= frame_find_by_id (*fid
);
3749 /* If inf_status->selected_frame_id is NULL, there was no previously
3753 warning (_("Unable to restore previously selected frame."));
3757 select_frame (frame
);
3763 restore_inferior_status (struct inferior_status
*inf_status
)
3765 stop_signal
= inf_status
->stop_signal
;
3766 stop_pc
= inf_status
->stop_pc
;
3767 stop_step
= inf_status
->stop_step
;
3768 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3769 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3770 stepping_over_breakpoint
= inf_status
->stepping_over_breakpoint
;
3771 step_range_start
= inf_status
->step_range_start
;
3772 step_range_end
= inf_status
->step_range_end
;
3773 step_frame_id
= inf_status
->step_frame_id
;
3774 step_over_calls
= inf_status
->step_over_calls
;
3775 stop_after_trap
= inf_status
->stop_after_trap
;
3776 stop_soon
= inf_status
->stop_soon
;
3777 bpstat_clear (&stop_bpstat
);
3778 stop_bpstat
= inf_status
->stop_bpstat
;
3779 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3780 proceed_to_finish
= inf_status
->proceed_to_finish
;
3782 /* The inferior can be gone if the user types "print exit(0)"
3783 (and perhaps other times). */
3784 if (target_has_execution
)
3785 /* NB: The register write goes through to the target. */
3786 regcache_cpy (get_current_regcache (), inf_status
->registers
);
3787 regcache_xfree (inf_status
->registers
);
3789 /* FIXME: If we are being called after stopping in a function which
3790 is called from gdb, we should not be trying to restore the
3791 selected frame; it just prints a spurious error message (The
3792 message is useful, however, in detecting bugs in gdb (like if gdb
3793 clobbers the stack)). In fact, should we be restoring the
3794 inferior status at all in that case? . */
3796 if (target_has_stack
&& inf_status
->restore_stack_info
)
3798 /* The point of catch_errors is that if the stack is clobbered,
3799 walking the stack might encounter a garbage pointer and
3800 error() trying to dereference it. */
3802 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3803 "Unable to restore previously selected frame:\n",
3804 RETURN_MASK_ERROR
) == 0)
3805 /* Error in restoring the selected frame. Select the innermost
3807 select_frame (get_current_frame ());
3815 do_restore_inferior_status_cleanup (void *sts
)
3817 restore_inferior_status (sts
);
3821 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3823 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3827 discard_inferior_status (struct inferior_status
*inf_status
)
3829 /* See save_inferior_status for info on stop_bpstat. */
3830 bpstat_clear (&inf_status
->stop_bpstat
);
3831 regcache_xfree (inf_status
->registers
);
3836 inferior_has_forked (int pid
, int *child_pid
)
3838 struct target_waitstatus last
;
3841 get_last_target_status (&last_ptid
, &last
);
3843 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3846 if (ptid_get_pid (last_ptid
) != pid
)
3849 *child_pid
= last
.value
.related_pid
;
3854 inferior_has_vforked (int pid
, int *child_pid
)
3856 struct target_waitstatus last
;
3859 get_last_target_status (&last_ptid
, &last
);
3861 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3864 if (ptid_get_pid (last_ptid
) != pid
)
3867 *child_pid
= last
.value
.related_pid
;
3872 inferior_has_execd (int pid
, char **execd_pathname
)
3874 struct target_waitstatus last
;
3877 get_last_target_status (&last_ptid
, &last
);
3879 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3882 if (ptid_get_pid (last_ptid
) != pid
)
3885 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3889 /* Oft used ptids */
3891 ptid_t minus_one_ptid
;
3893 /* Create a ptid given the necessary PID, LWP, and TID components. */
3896 ptid_build (int pid
, long lwp
, long tid
)
3906 /* Create a ptid from just a pid. */
3909 pid_to_ptid (int pid
)
3911 return ptid_build (pid
, 0, 0);
3914 /* Fetch the pid (process id) component from a ptid. */
3917 ptid_get_pid (ptid_t ptid
)
3922 /* Fetch the lwp (lightweight process) component from a ptid. */
3925 ptid_get_lwp (ptid_t ptid
)
3930 /* Fetch the tid (thread id) component from a ptid. */
3933 ptid_get_tid (ptid_t ptid
)
3938 /* ptid_equal() is used to test equality of two ptids. */
3941 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3943 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3944 && ptid1
.tid
== ptid2
.tid
);
3947 /* restore_inferior_ptid() will be used by the cleanup machinery
3948 to restore the inferior_ptid value saved in a call to
3949 save_inferior_ptid(). */
3952 restore_inferior_ptid (void *arg
)
3954 ptid_t
*saved_ptid_ptr
= arg
;
3955 inferior_ptid
= *saved_ptid_ptr
;
3959 /* Save the value of inferior_ptid so that it may be restored by a
3960 later call to do_cleanups(). Returns the struct cleanup pointer
3961 needed for later doing the cleanup. */
3964 save_inferior_ptid (void)
3966 ptid_t
*saved_ptid_ptr
;
3968 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3969 *saved_ptid_ptr
= inferior_ptid
;
3970 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3975 _initialize_infrun (void)
3979 struct cmd_list_element
*c
;
3981 add_info ("signals", signals_info
, _("\
3982 What debugger does when program gets various signals.\n\
3983 Specify a signal as argument to print info on that signal only."));
3984 add_info_alias ("handle", "signals", 0);
3986 add_com ("handle", class_run
, handle_command
, _("\
3987 Specify how to handle a signal.\n\
3988 Args are signals and actions to apply to those signals.\n\
3989 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3990 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3991 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3992 The special arg \"all\" is recognized to mean all signals except those\n\
3993 used by the debugger, typically SIGTRAP and SIGINT.\n\
3994 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3995 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3996 Stop means reenter debugger if this signal happens (implies print).\n\
3997 Print means print a message if this signal happens.\n\
3998 Pass means let program see this signal; otherwise program doesn't know.\n\
3999 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4000 Pass and Stop may be combined."));
4003 add_com ("lz", class_info
, signals_info
, _("\
4004 What debugger does when program gets various signals.\n\
4005 Specify a signal as argument to print info on that signal only."));
4006 add_com ("z", class_run
, xdb_handle_command
, _("\
4007 Specify how to handle a signal.\n\
4008 Args are signals and actions to apply to those signals.\n\
4009 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4010 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4011 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4012 The special arg \"all\" is recognized to mean all signals except those\n\
4013 used by the debugger, typically SIGTRAP and SIGINT.\n\
4014 Recognized actions include \"s\" (toggles between stop and nostop), \n\
4015 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4016 nopass), \"Q\" (noprint)\n\
4017 Stop means reenter debugger if this signal happens (implies print).\n\
4018 Print means print a message if this signal happens.\n\
4019 Pass means let program see this signal; otherwise program doesn't know.\n\
4020 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4021 Pass and Stop may be combined."));
4025 stop_command
= add_cmd ("stop", class_obscure
,
4026 not_just_help_class_command
, _("\
4027 There is no `stop' command, but you can set a hook on `stop'.\n\
4028 This allows you to set a list of commands to be run each time execution\n\
4029 of the program stops."), &cmdlist
);
4031 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
4032 Set inferior debugging."), _("\
4033 Show inferior debugging."), _("\
4034 When non-zero, inferior specific debugging is enabled."),
4037 &setdebuglist
, &showdebuglist
);
4039 numsigs
= (int) TARGET_SIGNAL_LAST
;
4040 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4041 signal_print
= (unsigned char *)
4042 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4043 signal_program
= (unsigned char *)
4044 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4045 for (i
= 0; i
< numsigs
; i
++)
4048 signal_print
[i
] = 1;
4049 signal_program
[i
] = 1;
4052 /* Signals caused by debugger's own actions
4053 should not be given to the program afterwards. */
4054 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4055 signal_program
[TARGET_SIGNAL_INT
] = 0;
4057 /* Signals that are not errors should not normally enter the debugger. */
4058 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4059 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4060 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4061 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4062 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4063 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4064 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4065 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4066 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4067 signal_print
[TARGET_SIGNAL_IO
] = 0;
4068 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4069 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4070 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4071 signal_print
[TARGET_SIGNAL_URG
] = 0;
4072 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4073 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4075 /* These signals are used internally by user-level thread
4076 implementations. (See signal(5) on Solaris.) Like the above
4077 signals, a healthy program receives and handles them as part of
4078 its normal operation. */
4079 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4080 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4081 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4082 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4083 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4084 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4086 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
4087 &stop_on_solib_events
, _("\
4088 Set stopping for shared library events."), _("\
4089 Show stopping for shared library events."), _("\
4090 If nonzero, gdb will give control to the user when the dynamic linker\n\
4091 notifies gdb of shared library events. The most common event of interest\n\
4092 to the user would be loading/unloading of a new library."),
4094 show_stop_on_solib_events
,
4095 &setlist
, &showlist
);
4097 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
4098 follow_fork_mode_kind_names
,
4099 &follow_fork_mode_string
, _("\
4100 Set debugger response to a program call of fork or vfork."), _("\
4101 Show debugger response to a program call of fork or vfork."), _("\
4102 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4103 parent - the original process is debugged after a fork\n\
4104 child - the new process is debugged after a fork\n\
4105 The unfollowed process will continue to run.\n\
4106 By default, the debugger will follow the parent process."),
4108 show_follow_fork_mode_string
,
4109 &setlist
, &showlist
);
4111 add_setshow_enum_cmd ("scheduler-locking", class_run
,
4112 scheduler_enums
, &scheduler_mode
, _("\
4113 Set mode for locking scheduler during execution."), _("\
4114 Show mode for locking scheduler during execution."), _("\
4115 off == no locking (threads may preempt at any time)\n\
4116 on == full locking (no thread except the current thread may run)\n\
4117 step == scheduler locked during every single-step operation.\n\
4118 In this mode, no other thread may run during a step command.\n\
4119 Other threads may run while stepping over a function call ('next')."),
4120 set_schedlock_func
, /* traps on target vector */
4121 show_scheduler_mode
,
4122 &setlist
, &showlist
);
4124 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
4125 Set mode of the step operation."), _("\
4126 Show mode of the step operation."), _("\
4127 When set, doing a step over a function without debug line information\n\
4128 will stop at the first instruction of that function. Otherwise, the\n\
4129 function is skipped and the step command stops at a different source line."),
4131 show_step_stop_if_no_debug
,
4132 &setlist
, &showlist
);
4134 /* ptid initializations */
4135 null_ptid
= ptid_build (0, 0, 0);
4136 minus_one_ptid
= ptid_build (-1, 0, 0);
4137 inferior_ptid
= null_ptid
;
4138 target_last_wait_ptid
= minus_one_ptid
;