1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
6 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 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)
1781 /* FIXME! This is obviously non-portable! */
1782 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1783 /* We need to restart all the threads now,
1784 * unles we're running in scheduler-locked mode.
1785 * Use currently_stepping to determine whether to
1788 /* FIXME MVS: is there any reason not to call resume()? */
1789 if (scheduler_mode
== schedlock_on
)
1790 target_resume (ecs
->ptid
,
1791 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1793 target_resume (RESUME_ALL
,
1794 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1795 prepare_to_wait (ecs
);
1800 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1801 context_switch (ecs
);
1802 ecs
->waiton_ptid
= ecs
->ptid
;
1803 ecs
->wp
= &(ecs
->ws
);
1804 ecs
->stepping_over_breakpoint
= 1;
1806 ecs
->infwait_state
= infwait_thread_hop_state
;
1808 registers_changed ();
1812 else if (singlestep_breakpoints_inserted_p
)
1814 sw_single_step_trap_p
= 1;
1815 ecs
->random_signal
= 0;
1819 ecs
->random_signal
= 1;
1821 /* See if something interesting happened to the non-current thread. If
1822 so, then switch to that thread. */
1823 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1826 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
1828 context_switch (ecs
);
1830 if (deprecated_context_hook
)
1831 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1834 if (singlestep_breakpoints_inserted_p
)
1836 /* Pull the single step breakpoints out of the target. */
1837 remove_single_step_breakpoints ();
1838 singlestep_breakpoints_inserted_p
= 0;
1841 if (stepped_after_stopped_by_watchpoint
)
1842 stopped_by_watchpoint
= 0;
1844 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
1846 /* If necessary, step over this watchpoint. We'll be back to display
1848 if (stopped_by_watchpoint
1849 && (HAVE_STEPPABLE_WATCHPOINT
1850 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
1853 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1855 /* At this point, we are stopped at an instruction which has
1856 attempted to write to a piece of memory under control of
1857 a watchpoint. The instruction hasn't actually executed
1858 yet. If we were to evaluate the watchpoint expression
1859 now, we would get the old value, and therefore no change
1860 would seem to have occurred.
1862 In order to make watchpoints work `right', we really need
1863 to complete the memory write, and then evaluate the
1864 watchpoint expression. We do this by single-stepping the
1867 It may not be necessary to disable the watchpoint to stop over
1868 it. For example, the PA can (with some kernel cooperation)
1869 single step over a watchpoint without disabling the watchpoint.
1871 It is far more common to need to disable a watchpoint to step
1872 the inferior over it. If we have non-steppable watchpoints,
1873 we must disable the current watchpoint; it's simplest to
1874 disable all watchpoints and breakpoints. */
1876 if (!HAVE_STEPPABLE_WATCHPOINT
)
1877 remove_breakpoints ();
1878 registers_changed ();
1879 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1880 ecs
->waiton_ptid
= ecs
->ptid
;
1881 if (HAVE_STEPPABLE_WATCHPOINT
)
1882 ecs
->infwait_state
= infwait_step_watch_state
;
1884 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1885 prepare_to_wait (ecs
);
1889 ecs
->stop_func_start
= 0;
1890 ecs
->stop_func_end
= 0;
1891 ecs
->stop_func_name
= 0;
1892 /* Don't care about return value; stop_func_start and stop_func_name
1893 will both be 0 if it doesn't work. */
1894 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1895 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1896 ecs
->stop_func_start
1897 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
1898 ecs
->stepping_over_breakpoint
= 0;
1899 bpstat_clear (&stop_bpstat
);
1901 stop_print_frame
= 1;
1902 ecs
->random_signal
= 0;
1903 stopped_by_random_signal
= 0;
1905 if (stop_signal
== TARGET_SIGNAL_TRAP
1906 && stepping_over_breakpoint
1907 && gdbarch_single_step_through_delay_p (current_gdbarch
)
1908 && currently_stepping (ecs
))
1910 /* We're trying to step off a breakpoint. Turns out that we're
1911 also on an instruction that needs to be stepped multiple
1912 times before it's been fully executing. E.g., architectures
1913 with a delay slot. It needs to be stepped twice, once for
1914 the instruction and once for the delay slot. */
1915 int step_through_delay
1916 = gdbarch_single_step_through_delay (current_gdbarch
,
1917 get_current_frame ());
1918 if (debug_infrun
&& step_through_delay
)
1919 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
1920 if (step_range_end
== 0 && step_through_delay
)
1922 /* The user issued a continue when stopped at a breakpoint.
1923 Set up for another trap and get out of here. */
1924 ecs
->stepping_over_breakpoint
= 1;
1928 else if (step_through_delay
)
1930 /* The user issued a step when stopped at a breakpoint.
1931 Maybe we should stop, maybe we should not - the delay
1932 slot *might* correspond to a line of source. In any
1933 case, don't decide that here, just set
1934 ecs->stepping_over_breakpoint, making sure we
1935 single-step again before breakpoints are re-inserted. */
1936 ecs
->stepping_over_breakpoint
= 1;
1940 /* Look at the cause of the stop, and decide what to do.
1941 The alternatives are:
1942 1) break; to really stop and return to the debugger,
1943 2) drop through to start up again
1944 (set ecs->stepping_over_breakpoint to 1 to single step once)
1945 3) set ecs->random_signal to 1, and the decision between 1 and 2
1946 will be made according to the signal handling tables. */
1948 /* First, distinguish signals caused by the debugger from signals
1949 that have to do with the program's own actions. Note that
1950 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1951 on the operating system version. Here we detect when a SIGILL or
1952 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1953 something similar for SIGSEGV, since a SIGSEGV will be generated
1954 when we're trying to execute a breakpoint instruction on a
1955 non-executable stack. This happens for call dummy breakpoints
1956 for architectures like SPARC that place call dummies on the
1959 if (stop_signal
== TARGET_SIGNAL_TRAP
1960 || (breakpoint_inserted_here_p (stop_pc
)
1961 && (stop_signal
== TARGET_SIGNAL_ILL
1962 || stop_signal
== TARGET_SIGNAL_SEGV
1963 || stop_signal
== TARGET_SIGNAL_EMT
))
1964 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
1965 || stop_soon
== STOP_QUIETLY_REMOTE
)
1967 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1970 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
1971 stop_print_frame
= 0;
1972 stop_stepping (ecs
);
1976 /* This is originated from start_remote(), start_inferior() and
1977 shared libraries hook functions. */
1978 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
1981 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
1982 stop_stepping (ecs
);
1986 /* This originates from attach_command(). We need to overwrite
1987 the stop_signal here, because some kernels don't ignore a
1988 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1989 See more comments in inferior.h. */
1990 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1992 stop_stepping (ecs
);
1993 if (stop_signal
== TARGET_SIGNAL_STOP
)
1994 stop_signal
= TARGET_SIGNAL_0
;
1998 /* See if there is a breakpoint at the current PC. */
1999 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2001 /* Following in case break condition called a
2003 stop_print_frame
= 1;
2005 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2006 at one stage in the past included checks for an inferior
2007 function call's call dummy's return breakpoint. The original
2008 comment, that went with the test, read:
2010 ``End of a stack dummy. Some systems (e.g. Sony news) give
2011 another signal besides SIGTRAP, so check here as well as
2014 If someone ever tries to get get call dummys on a
2015 non-executable stack to work (where the target would stop
2016 with something like a SIGSEGV), then those tests might need
2017 to be re-instated. Given, however, that the tests were only
2018 enabled when momentary breakpoints were not being used, I
2019 suspect that it won't be the case.
2021 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2022 be necessary for call dummies on a non-executable stack on
2025 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2027 = !(bpstat_explains_signal (stop_bpstat
)
2028 || stepping_over_breakpoint
2029 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2032 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
2033 if (!ecs
->random_signal
)
2034 stop_signal
= TARGET_SIGNAL_TRAP
;
2038 /* When we reach this point, we've pretty much decided
2039 that the reason for stopping must've been a random
2040 (unexpected) signal. */
2043 ecs
->random_signal
= 1;
2045 process_event_stop_test
:
2046 /* For the program's own signals, act according to
2047 the signal handling tables. */
2049 if (ecs
->random_signal
)
2051 /* Signal not for debugging purposes. */
2055 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
2057 stopped_by_random_signal
= 1;
2059 if (signal_print
[stop_signal
])
2062 target_terminal_ours_for_output ();
2063 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2065 if (signal_stop
[stop_signal
])
2067 stop_stepping (ecs
);
2070 /* If not going to stop, give terminal back
2071 if we took it away. */
2073 target_terminal_inferior ();
2075 /* Clear the signal if it should not be passed. */
2076 if (signal_program
[stop_signal
] == 0)
2077 stop_signal
= TARGET_SIGNAL_0
;
2079 if (prev_pc
== read_pc ()
2080 && breakpoint_here_p (read_pc ())
2081 && !breakpoint_inserted_here_p (read_pc ())
2082 && step_resume_breakpoint
== NULL
)
2084 /* We were just starting a new sequence, attempting to
2085 single-step off of a breakpoint and expecting a SIGTRAP.
2086 Intead this signal arrives. This signal will take us out
2087 of the stepping range so GDB needs to remember to, when
2088 the signal handler returns, resume stepping off that
2090 /* To simplify things, "continue" is forced to use the same
2091 code paths as single-step - set a breakpoint at the
2092 signal return address and then, once hit, step off that
2095 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2096 ecs
->step_after_step_resume_breakpoint
= 1;
2101 if (step_range_end
!= 0
2102 && stop_signal
!= TARGET_SIGNAL_0
2103 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
2104 && frame_id_eq (get_frame_id (get_current_frame ()),
2106 && step_resume_breakpoint
== NULL
)
2108 /* The inferior is about to take a signal that will take it
2109 out of the single step range. Set a breakpoint at the
2110 current PC (which is presumably where the signal handler
2111 will eventually return) and then allow the inferior to
2114 Note that this is only needed for a signal delivered
2115 while in the single-step range. Nested signals aren't a
2116 problem as they eventually all return. */
2117 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2122 /* Note: step_resume_breakpoint may be non-NULL. This occures
2123 when either there's a nested signal, or when there's a
2124 pending signal enabled just as the signal handler returns
2125 (leaving the inferior at the step-resume-breakpoint without
2126 actually executing it). Either way continue until the
2127 breakpoint is really hit. */
2132 /* Handle cases caused by hitting a breakpoint. */
2134 CORE_ADDR jmp_buf_pc
;
2135 struct bpstat_what what
;
2137 what
= bpstat_what (stop_bpstat
);
2139 if (what
.call_dummy
)
2141 stop_stack_dummy
= 1;
2144 switch (what
.main_action
)
2146 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2147 /* If we hit the breakpoint at longjmp, disable it for the
2148 duration of this command. Then, install a temporary
2149 breakpoint at the target of the jmp_buf. */
2151 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2152 disable_longjmp_breakpoint ();
2153 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
2154 || !gdbarch_get_longjmp_target (current_gdbarch
,
2155 get_current_frame (), &jmp_buf_pc
))
2161 /* Need to blow away step-resume breakpoint, as it
2162 interferes with us */
2163 if (step_resume_breakpoint
!= NULL
)
2165 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2168 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2169 ecs
->handling_longjmp
= 1; /* FIXME */
2173 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2174 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2176 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2177 disable_longjmp_breakpoint ();
2178 ecs
->handling_longjmp
= 0; /* FIXME */
2179 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2181 /* else fallthrough */
2183 case BPSTAT_WHAT_SINGLE
:
2185 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2186 ecs
->stepping_over_breakpoint
= 1;
2187 /* Still need to check other stuff, at least the case
2188 where we are stepping and step out of the right range. */
2191 case BPSTAT_WHAT_STOP_NOISY
:
2193 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2194 stop_print_frame
= 1;
2196 /* We are about to nuke the step_resume_breakpointt via the
2197 cleanup chain, so no need to worry about it here. */
2199 stop_stepping (ecs
);
2202 case BPSTAT_WHAT_STOP_SILENT
:
2204 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2205 stop_print_frame
= 0;
2207 /* We are about to nuke the step_resume_breakpoin via the
2208 cleanup chain, so no need to worry about it here. */
2210 stop_stepping (ecs
);
2213 case BPSTAT_WHAT_STEP_RESUME
:
2214 /* This proably demands a more elegant solution, but, yeah
2217 This function's use of the simple variable
2218 step_resume_breakpoint doesn't seem to accomodate
2219 simultaneously active step-resume bp's, although the
2220 breakpoint list certainly can.
2222 If we reach here and step_resume_breakpoint is already
2223 NULL, then apparently we have multiple active
2224 step-resume bp's. We'll just delete the breakpoint we
2225 stopped at, and carry on.
2227 Correction: what the code currently does is delete a
2228 step-resume bp, but it makes no effort to ensure that
2229 the one deleted is the one currently stopped at. MVS */
2232 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2234 if (step_resume_breakpoint
== NULL
)
2236 step_resume_breakpoint
=
2237 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2239 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2240 if (ecs
->step_after_step_resume_breakpoint
)
2242 /* Back when the step-resume breakpoint was inserted, we
2243 were trying to single-step off a breakpoint. Go back
2245 ecs
->step_after_step_resume_breakpoint
= 0;
2246 ecs
->stepping_over_breakpoint
= 1;
2252 case BPSTAT_WHAT_CHECK_SHLIBS
:
2253 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2256 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2257 /* Remove breakpoints, we eventually want to step over the
2258 shlib event breakpoint, and SOLIB_ADD might adjust
2259 breakpoint addresses via breakpoint_re_set. */
2260 remove_breakpoints ();
2262 /* Check for any newly added shared libraries if we're
2263 supposed to be adding them automatically. Switch
2264 terminal for any messages produced by
2265 breakpoint_re_set. */
2266 target_terminal_ours_for_output ();
2267 /* NOTE: cagney/2003-11-25: Make certain that the target
2268 stack's section table is kept up-to-date. Architectures,
2269 (e.g., PPC64), use the section table to perform
2270 operations such as address => section name and hence
2271 require the table to contain all sections (including
2272 those found in shared libraries). */
2273 /* NOTE: cagney/2003-11-25: Pass current_target and not
2274 exec_ops to SOLIB_ADD. This is because current GDB is
2275 only tooled to propagate section_table changes out from
2276 the "current_target" (see target_resize_to_sections), and
2277 not up from the exec stratum. This, of course, isn't
2278 right. "infrun.c" should only interact with the
2279 exec/process stratum, instead relying on the target stack
2280 to propagate relevant changes (stop, section table
2281 changed, ...) up to other layers. */
2283 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2285 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2287 target_terminal_inferior ();
2289 /* If requested, stop when the dynamic linker notifies
2290 gdb of events. This allows the user to get control
2291 and place breakpoints in initializer routines for
2292 dynamically loaded objects (among other things). */
2293 if (stop_on_solib_events
|| stop_stack_dummy
)
2295 stop_stepping (ecs
);
2299 /* If we stopped due to an explicit catchpoint, then the
2300 (see above) call to SOLIB_ADD pulled in any symbols
2301 from a newly-loaded library, if appropriate.
2303 We do want the inferior to stop, but not where it is
2304 now, which is in the dynamic linker callback. Rather,
2305 we would like it stop in the user's program, just after
2306 the call that caused this catchpoint to trigger. That
2307 gives the user a more useful vantage from which to
2308 examine their program's state. */
2309 else if (what
.main_action
2310 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2312 /* ??rehrauer: If I could figure out how to get the
2313 right return PC from here, we could just set a temp
2314 breakpoint and resume. I'm not sure we can without
2315 cracking open the dld's shared libraries and sniffing
2316 their unwind tables and text/data ranges, and that's
2317 not a terribly portable notion.
2319 Until that time, we must step the inferior out of the
2320 dld callback, and also out of the dld itself (and any
2321 code or stubs in libdld.sl, such as "shl_load" and
2322 friends) until we reach non-dld code. At that point,
2323 we can stop stepping. */
2324 bpstat_get_triggered_catchpoints (stop_bpstat
,
2326 stepping_through_solib_catchpoints
);
2327 ecs
->stepping_through_solib_after_catch
= 1;
2329 /* Be sure to lift all breakpoints, so the inferior does
2330 actually step past this point... */
2331 ecs
->stepping_over_breakpoint
= 1;
2336 /* We want to step over this breakpoint, then keep going. */
2337 ecs
->stepping_over_breakpoint
= 1;
2343 case BPSTAT_WHAT_LAST
:
2344 /* Not a real code, but listed here to shut up gcc -Wall. */
2346 case BPSTAT_WHAT_KEEP_CHECKING
:
2351 /* We come here if we hit a breakpoint but should not
2352 stop for it. Possibly we also were stepping
2353 and should stop for that. So fall through and
2354 test for stepping. But, if not stepping,
2357 /* Are we stepping to get the inferior out of the dynamic linker's
2358 hook (and possibly the dld itself) after catching a shlib
2360 if (ecs
->stepping_through_solib_after_catch
)
2362 #if defined(SOLIB_ADD)
2363 /* Have we reached our destination? If not, keep going. */
2364 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2367 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2368 ecs
->stepping_over_breakpoint
= 1;
2374 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2375 /* Else, stop and report the catchpoint(s) whose triggering
2376 caused us to begin stepping. */
2377 ecs
->stepping_through_solib_after_catch
= 0;
2378 bpstat_clear (&stop_bpstat
);
2379 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2380 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2381 stop_print_frame
= 1;
2382 stop_stepping (ecs
);
2386 if (step_resume_breakpoint
)
2389 fprintf_unfiltered (gdb_stdlog
,
2390 "infrun: step-resume breakpoint is inserted\n");
2392 /* Having a step-resume breakpoint overrides anything
2393 else having to do with stepping commands until
2394 that breakpoint is reached. */
2399 if (step_range_end
== 0)
2402 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
2403 /* Likewise if we aren't even stepping. */
2408 /* If stepping through a line, keep going if still within it.
2410 Note that step_range_end is the address of the first instruction
2411 beyond the step range, and NOT the address of the last instruction
2413 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2416 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
2417 paddr_nz (step_range_start
),
2418 paddr_nz (step_range_end
));
2423 /* We stepped out of the stepping range. */
2425 /* If we are stepping at the source level and entered the runtime
2426 loader dynamic symbol resolution code, we keep on single stepping
2427 until we exit the run time loader code and reach the callee's
2429 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2430 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2431 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
)
2433 && in_solib_dynsym_resolve_code (stop_pc
)
2437 CORE_ADDR pc_after_resolver
=
2438 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2441 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
2443 if (pc_after_resolver
)
2445 /* Set up a step-resume breakpoint at the address
2446 indicated by SKIP_SOLIB_RESOLVER. */
2447 struct symtab_and_line sr_sal
;
2449 sr_sal
.pc
= pc_after_resolver
;
2451 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2458 if (step_range_end
!= 1
2459 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2460 || step_over_calls
== STEP_OVER_ALL
)
2461 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2464 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
2465 /* The inferior, while doing a "step" or "next", has ended up in
2466 a signal trampoline (either by a signal being delivered or by
2467 the signal handler returning). Just single-step until the
2468 inferior leaves the trampoline (either by calling the handler
2474 /* Check for subroutine calls. The check for the current frame
2475 equalling the step ID is not necessary - the check of the
2476 previous frame's ID is sufficient - but it is a common case and
2477 cheaper than checking the previous frame's ID.
2479 NOTE: frame_id_eq will never report two invalid frame IDs as
2480 being equal, so to get into this block, both the current and
2481 previous frame must have valid frame IDs. */
2482 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
)
2483 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2485 CORE_ADDR real_stop_pc
;
2488 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
2490 if ((step_over_calls
== STEP_OVER_NONE
)
2491 || ((step_range_end
== 1)
2492 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2494 /* I presume that step_over_calls is only 0 when we're
2495 supposed to be stepping at the assembly language level
2496 ("stepi"). Just stop. */
2497 /* Also, maybe we just did a "nexti" inside a prolog, so we
2498 thought it was a subroutine call but it was not. Stop as
2501 print_stop_reason (END_STEPPING_RANGE
, 0);
2502 stop_stepping (ecs
);
2506 if (step_over_calls
== STEP_OVER_ALL
)
2508 /* We're doing a "next", set a breakpoint at callee's return
2509 address (the address at which the caller will
2511 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2516 /* If we are in a function call trampoline (a stub between the
2517 calling routine and the real function), locate the real
2518 function. That's what tells us (a) whether we want to step
2519 into it at all, and (b) what prologue we want to run to the
2520 end of, if we do step into it. */
2521 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
2522 if (real_stop_pc
== 0)
2523 real_stop_pc
= gdbarch_skip_trampoline_code
2524 (current_gdbarch
, get_current_frame (), stop_pc
);
2525 if (real_stop_pc
!= 0)
2526 ecs
->stop_func_start
= real_stop_pc
;
2529 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2530 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
)
2532 in_solib_dynsym_resolve_code (ecs
->stop_func_start
)
2536 struct symtab_and_line sr_sal
;
2538 sr_sal
.pc
= ecs
->stop_func_start
;
2540 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2545 /* If we have line number information for the function we are
2546 thinking of stepping into, step into it.
2548 If there are several symtabs at that PC (e.g. with include
2549 files), just want to know whether *any* of them have line
2550 numbers. find_pc_line handles this. */
2552 struct symtab_and_line tmp_sal
;
2554 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2555 if (tmp_sal
.line
!= 0)
2557 step_into_function (ecs
);
2562 /* If we have no line number and the step-stop-if-no-debug is
2563 set, we stop the step so that the user has a chance to switch
2564 in assembly mode. */
2565 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2568 print_stop_reason (END_STEPPING_RANGE
, 0);
2569 stop_stepping (ecs
);
2573 /* Set a breakpoint at callee's return address (the address at
2574 which the caller will resume). */
2575 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2580 /* If we're in the return path from a shared library trampoline,
2581 we want to proceed through the trampoline when stepping. */
2582 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
2583 stop_pc
, ecs
->stop_func_name
))
2585 /* Determine where this trampoline returns. */
2586 CORE_ADDR real_stop_pc
;
2587 real_stop_pc
= gdbarch_skip_trampoline_code
2588 (current_gdbarch
, get_current_frame (), stop_pc
);
2591 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
2593 /* Only proceed through if we know where it's going. */
2596 /* And put the step-breakpoint there and go until there. */
2597 struct symtab_and_line sr_sal
;
2599 init_sal (&sr_sal
); /* initialize to zeroes */
2600 sr_sal
.pc
= real_stop_pc
;
2601 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2603 /* Do not specify what the fp should be when we stop since
2604 on some machines the prologue is where the new fp value
2606 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2608 /* Restart without fiddling with the step ranges or
2615 ecs
->sal
= find_pc_line (stop_pc
, 0);
2617 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2618 the trampoline processing logic, however, there are some trampolines
2619 that have no names, so we should do trampoline handling first. */
2620 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2621 && ecs
->stop_func_name
== NULL
2622 && ecs
->sal
.line
== 0)
2625 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
2627 /* The inferior just stepped into, or returned to, an
2628 undebuggable function (where there is no debugging information
2629 and no line number corresponding to the address where the
2630 inferior stopped). Since we want to skip this kind of code,
2631 we keep going until the inferior returns from this
2632 function - unless the user has asked us not to (via
2633 set step-mode) or we no longer know how to get back
2634 to the call site. */
2635 if (step_stop_if_no_debug
2636 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2638 /* If we have no line number and the step-stop-if-no-debug
2639 is set, we stop the step so that the user has a chance to
2640 switch in assembly mode. */
2642 print_stop_reason (END_STEPPING_RANGE
, 0);
2643 stop_stepping (ecs
);
2648 /* Set a breakpoint at callee's return address (the address
2649 at which the caller will resume). */
2650 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2656 if (step_range_end
== 1)
2658 /* It is stepi or nexti. We always want to stop stepping after
2661 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
2663 print_stop_reason (END_STEPPING_RANGE
, 0);
2664 stop_stepping (ecs
);
2668 if (ecs
->sal
.line
== 0)
2670 /* We have no line number information. That means to stop
2671 stepping (does this always happen right after one instruction,
2672 when we do "s" in a function with no line numbers,
2673 or can this happen as a result of a return or longjmp?). */
2675 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
2677 print_stop_reason (END_STEPPING_RANGE
, 0);
2678 stop_stepping (ecs
);
2682 if ((stop_pc
== ecs
->sal
.pc
)
2683 && (ecs
->current_line
!= ecs
->sal
.line
2684 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2686 /* We are at the start of a different line. So stop. Note that
2687 we don't stop if we step into the middle of a different line.
2688 That is said to make things like for (;;) statements work
2691 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
2693 print_stop_reason (END_STEPPING_RANGE
, 0);
2694 stop_stepping (ecs
);
2698 /* We aren't done stepping.
2700 Optimize by setting the stepping range to the line.
2701 (We might not be in the original line, but if we entered a
2702 new line in mid-statement, we continue stepping. This makes
2703 things like for(;;) statements work better.) */
2705 step_range_start
= ecs
->sal
.pc
;
2706 step_range_end
= ecs
->sal
.end
;
2707 step_frame_id
= get_frame_id (get_current_frame ());
2708 ecs
->current_line
= ecs
->sal
.line
;
2709 ecs
->current_symtab
= ecs
->sal
.symtab
;
2711 /* In the case where we just stepped out of a function into the
2712 middle of a line of the caller, continue stepping, but
2713 step_frame_id must be modified to current frame */
2715 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2716 generous. It will trigger on things like a step into a frameless
2717 stackless leaf function. I think the logic should instead look
2718 at the unwound frame ID has that should give a more robust
2719 indication of what happened. */
2720 if (step
- ID
== current
- ID
)
2721 still stepping in same function
;
2722 else if (step
- ID
== unwind (current
- ID
))
2723 stepped into a function
;
2725 stepped out of a function
;
2726 /* Of course this assumes that the frame ID unwind code is robust
2727 and we're willing to introduce frame unwind logic into this
2728 function. Fortunately, those days are nearly upon us. */
2731 struct frame_info
*frame
= get_current_frame ();
2732 struct frame_id current_frame
= get_frame_id (frame
);
2733 if (!(frame_id_inner (get_frame_arch (frame
), current_frame
,
2735 step_frame_id
= current_frame
;
2739 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
2743 /* Are we in the middle of stepping? */
2746 currently_stepping (struct execution_control_state
*ecs
)
2748 return ((!ecs
->handling_longjmp
2749 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2750 || stepping_over_breakpoint
))
2751 || ecs
->stepping_through_solib_after_catch
2752 || bpstat_should_step ());
2755 /* Subroutine call with source code we should not step over. Do step
2756 to the first line of code in it. */
2759 step_into_function (struct execution_control_state
*ecs
)
2762 struct symtab_and_line sr_sal
;
2764 s
= find_pc_symtab (stop_pc
);
2765 if (s
&& s
->language
!= language_asm
)
2766 ecs
->stop_func_start
= gdbarch_skip_prologue
2767 (current_gdbarch
, ecs
->stop_func_start
);
2769 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2770 /* Use the step_resume_break to step until the end of the prologue,
2771 even if that involves jumps (as it seems to on the vax under
2773 /* If the prologue ends in the middle of a source line, continue to
2774 the end of that source line (if it is still within the function).
2775 Otherwise, just go to end of prologue. */
2777 && ecs
->sal
.pc
!= ecs
->stop_func_start
2778 && ecs
->sal
.end
< ecs
->stop_func_end
)
2779 ecs
->stop_func_start
= ecs
->sal
.end
;
2781 /* Architectures which require breakpoint adjustment might not be able
2782 to place a breakpoint at the computed address. If so, the test
2783 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2784 ecs->stop_func_start to an address at which a breakpoint may be
2785 legitimately placed.
2787 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2788 made, GDB will enter an infinite loop when stepping through
2789 optimized code consisting of VLIW instructions which contain
2790 subinstructions corresponding to different source lines. On
2791 FR-V, it's not permitted to place a breakpoint on any but the
2792 first subinstruction of a VLIW instruction. When a breakpoint is
2793 set, GDB will adjust the breakpoint address to the beginning of
2794 the VLIW instruction. Thus, we need to make the corresponding
2795 adjustment here when computing the stop address. */
2797 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2799 ecs
->stop_func_start
2800 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2801 ecs
->stop_func_start
);
2804 if (ecs
->stop_func_start
== stop_pc
)
2806 /* We are already there: stop now. */
2808 print_stop_reason (END_STEPPING_RANGE
, 0);
2809 stop_stepping (ecs
);
2814 /* Put the step-breakpoint there and go until there. */
2815 init_sal (&sr_sal
); /* initialize to zeroes */
2816 sr_sal
.pc
= ecs
->stop_func_start
;
2817 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2819 /* Do not specify what the fp should be when we stop since on
2820 some machines the prologue is where the new fp value is
2822 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2824 /* And make sure stepping stops right away then. */
2825 step_range_end
= step_range_start
;
2830 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
2831 This is used to both functions and to skip over code. */
2834 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
2835 struct frame_id sr_id
)
2837 /* There should never be more than one step-resume breakpoint per
2838 thread, so we should never be setting a new
2839 step_resume_breakpoint when one is already active. */
2840 gdb_assert (step_resume_breakpoint
== NULL
);
2843 fprintf_unfiltered (gdb_stdlog
,
2844 "infrun: inserting step-resume breakpoint at 0x%s\n",
2845 paddr_nz (sr_sal
.pc
));
2847 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
2851 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
2852 to skip a potential signal handler.
2854 This is called with the interrupted function's frame. The signal
2855 handler, when it returns, will resume the interrupted function at
2859 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
2861 struct symtab_and_line sr_sal
;
2863 gdb_assert (return_frame
!= NULL
);
2864 init_sal (&sr_sal
); /* initialize to zeros */
2866 sr_sal
.pc
= gdbarch_addr_bits_remove
2867 (current_gdbarch
, get_frame_pc (return_frame
));
2868 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2870 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
2873 /* Similar to insert_step_resume_breakpoint_at_frame, except
2874 but a breakpoint at the previous frame's PC. This is used to
2875 skip a function after stepping into it (for "next" or if the called
2876 function has no debugging information).
2878 The current function has almost always been reached by single
2879 stepping a call or return instruction. NEXT_FRAME belongs to the
2880 current function, and the breakpoint will be set at the caller's
2883 This is a separate function rather than reusing
2884 insert_step_resume_breakpoint_at_frame in order to avoid
2885 get_prev_frame, which may stop prematurely (see the implementation
2886 of frame_unwind_id for an example). */
2889 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
2891 struct symtab_and_line sr_sal
;
2893 /* We shouldn't have gotten here if we don't know where the call site
2895 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
2897 init_sal (&sr_sal
); /* initialize to zeros */
2899 sr_sal
.pc
= gdbarch_addr_bits_remove
2900 (current_gdbarch
, frame_pc_unwind (next_frame
));
2901 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2903 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
2907 stop_stepping (struct execution_control_state
*ecs
)
2910 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
2912 /* Let callers know we don't want to wait for the inferior anymore. */
2913 ecs
->wait_some_more
= 0;
2916 /* This function handles various cases where we need to continue
2917 waiting for the inferior. */
2918 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2921 keep_going (struct execution_control_state
*ecs
)
2923 /* Save the pc before execution, to compare with pc after stop. */
2924 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2926 /* If we did not do break;, it means we should keep running the
2927 inferior and not return to debugger. */
2929 if (stepping_over_breakpoint
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2931 /* We took a signal (which we are supposed to pass through to
2932 the inferior, else we'd have done a break above) and we
2933 haven't yet gotten our trap. Simply continue. */
2934 resume (currently_stepping (ecs
), stop_signal
);
2938 /* Either the trap was not expected, but we are continuing
2939 anyway (the user asked that this signal be passed to the
2942 The signal was SIGTRAP, e.g. it was our signal, but we
2943 decided we should resume from it.
2945 We're going to run this baby now!
2947 Note that insert_breakpoints won't try to re-insert
2948 already inserted breakpoints. Therefore, we don't
2949 care if breakpoints were already inserted, or not. */
2951 if (ecs
->stepping_over_breakpoint
)
2953 remove_breakpoints ();
2957 struct gdb_exception e
;
2958 /* Stop stepping when inserting breakpoints
2960 TRY_CATCH (e
, RETURN_MASK_ERROR
)
2962 insert_breakpoints ();
2966 stop_stepping (ecs
);
2971 stepping_over_breakpoint
= ecs
->stepping_over_breakpoint
;
2973 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2974 specifies that such a signal should be delivered to the
2977 Typically, this would occure when a user is debugging a
2978 target monitor on a simulator: the target monitor sets a
2979 breakpoint; the simulator encounters this break-point and
2980 halts the simulation handing control to GDB; GDB, noteing
2981 that the break-point isn't valid, returns control back to the
2982 simulator; the simulator then delivers the hardware
2983 equivalent of a SIGNAL_TRAP to the program being debugged. */
2985 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2986 stop_signal
= TARGET_SIGNAL_0
;
2989 resume (currently_stepping (ecs
), stop_signal
);
2992 prepare_to_wait (ecs
);
2995 /* This function normally comes after a resume, before
2996 handle_inferior_event exits. It takes care of any last bits of
2997 housekeeping, and sets the all-important wait_some_more flag. */
3000 prepare_to_wait (struct execution_control_state
*ecs
)
3003 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
3004 if (ecs
->infwait_state
== infwait_normal_state
)
3006 overlay_cache_invalid
= 1;
3008 /* We have to invalidate the registers BEFORE calling
3009 target_wait because they can be loaded from the target while
3010 in target_wait. This makes remote debugging a bit more
3011 efficient for those targets that provide critical registers
3012 as part of their normal status mechanism. */
3014 registers_changed ();
3015 ecs
->waiton_ptid
= pid_to_ptid (-1);
3016 ecs
->wp
= &(ecs
->ws
);
3018 /* This is the old end of the while loop. Let everybody know we
3019 want to wait for the inferior some more and get called again
3021 ecs
->wait_some_more
= 1;
3024 /* Print why the inferior has stopped. We always print something when
3025 the inferior exits, or receives a signal. The rest of the cases are
3026 dealt with later on in normal_stop() and print_it_typical(). Ideally
3027 there should be a call to this function from handle_inferior_event()
3028 each time stop_stepping() is called.*/
3030 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3032 switch (stop_reason
)
3034 case END_STEPPING_RANGE
:
3035 /* We are done with a step/next/si/ni command. */
3036 /* For now print nothing. */
3037 /* Print a message only if not in the middle of doing a "step n"
3038 operation for n > 1 */
3039 if (!step_multi
|| !stop_step
)
3040 if (ui_out_is_mi_like_p (uiout
))
3043 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
3046 /* The inferior was terminated by a signal. */
3047 annotate_signalled ();
3048 if (ui_out_is_mi_like_p (uiout
))
3051 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
3052 ui_out_text (uiout
, "\nProgram terminated with signal ");
3053 annotate_signal_name ();
3054 ui_out_field_string (uiout
, "signal-name",
3055 target_signal_to_name (stop_info
));
3056 annotate_signal_name_end ();
3057 ui_out_text (uiout
, ", ");
3058 annotate_signal_string ();
3059 ui_out_field_string (uiout
, "signal-meaning",
3060 target_signal_to_string (stop_info
));
3061 annotate_signal_string_end ();
3062 ui_out_text (uiout
, ".\n");
3063 ui_out_text (uiout
, "The program no longer exists.\n");
3066 /* The inferior program is finished. */
3067 annotate_exited (stop_info
);
3070 if (ui_out_is_mi_like_p (uiout
))
3071 ui_out_field_string (uiout
, "reason",
3072 async_reason_lookup (EXEC_ASYNC_EXITED
));
3073 ui_out_text (uiout
, "\nProgram exited with code ");
3074 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3075 (unsigned int) stop_info
);
3076 ui_out_text (uiout
, ".\n");
3080 if (ui_out_is_mi_like_p (uiout
))
3083 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
3084 ui_out_text (uiout
, "\nProgram exited normally.\n");
3086 /* Support the --return-child-result option. */
3087 return_child_result_value
= stop_info
;
3089 case SIGNAL_RECEIVED
:
3090 /* Signal received. The signal table tells us to print about
3093 ui_out_text (uiout
, "\nProgram received signal ");
3094 annotate_signal_name ();
3095 if (ui_out_is_mi_like_p (uiout
))
3097 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3098 ui_out_field_string (uiout
, "signal-name",
3099 target_signal_to_name (stop_info
));
3100 annotate_signal_name_end ();
3101 ui_out_text (uiout
, ", ");
3102 annotate_signal_string ();
3103 ui_out_field_string (uiout
, "signal-meaning",
3104 target_signal_to_string (stop_info
));
3105 annotate_signal_string_end ();
3106 ui_out_text (uiout
, ".\n");
3109 internal_error (__FILE__
, __LINE__
,
3110 _("print_stop_reason: unrecognized enum value"));
3116 /* Here to return control to GDB when the inferior stops for real.
3117 Print appropriate messages, remove breakpoints, give terminal our modes.
3119 STOP_PRINT_FRAME nonzero means print the executing frame
3120 (pc, function, args, file, line number and line text).
3121 BREAKPOINTS_FAILED nonzero means stop was due to error
3122 attempting to insert breakpoints. */
3127 struct target_waitstatus last
;
3130 get_last_target_status (&last_ptid
, &last
);
3132 /* As with the notification of thread events, we want to delay
3133 notifying the user that we've switched thread context until
3134 the inferior actually stops.
3136 There's no point in saying anything if the inferior has exited.
3137 Note that SIGNALLED here means "exited with a signal", not
3138 "received a signal". */
3139 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3140 && target_has_execution
3141 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3142 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3144 target_terminal_ours_for_output ();
3145 printf_filtered (_("[Switching to %s]\n"),
3146 target_pid_to_str (inferior_ptid
));
3147 previous_inferior_ptid
= inferior_ptid
;
3150 /* NOTE drow/2004-01-17: Is this still necessary? */
3151 /* Make sure that the current_frame's pc is correct. This
3152 is a correction for setting up the frame info before doing
3153 gdbarch_decr_pc_after_break */
3154 if (target_has_execution
)
3155 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3156 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3157 frame code to check for this and sort out any resultant mess.
3158 gdbarch_decr_pc_after_break needs to just go away. */
3159 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3161 if (target_has_execution
)
3163 if (remove_breakpoints ())
3165 target_terminal_ours_for_output ();
3166 printf_filtered (_("\
3167 Cannot remove breakpoints because program is no longer writable.\n\
3168 It might be running in another process.\n\
3169 Further execution is probably impossible.\n"));
3173 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3174 Delete any breakpoint that is to be deleted at the next stop. */
3176 breakpoint_auto_delete (stop_bpstat
);
3178 /* If an auto-display called a function and that got a signal,
3179 delete that auto-display to avoid an infinite recursion. */
3181 if (stopped_by_random_signal
)
3182 disable_current_display ();
3184 /* Don't print a message if in the middle of doing a "step n"
3185 operation for n > 1 */
3186 if (step_multi
&& stop_step
)
3189 target_terminal_ours ();
3191 /* Set the current source location. This will also happen if we
3192 display the frame below, but the current SAL will be incorrect
3193 during a user hook-stop function. */
3194 if (target_has_stack
&& !stop_stack_dummy
)
3195 set_current_sal_from_frame (get_current_frame (), 1);
3197 /* Look up the hook_stop and run it (CLI internally handles problem
3198 of stop_command's pre-hook not existing). */
3200 catch_errors (hook_stop_stub
, stop_command
,
3201 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3203 if (!target_has_stack
)
3209 /* Select innermost stack frame - i.e., current frame is frame 0,
3210 and current location is based on that.
3211 Don't do this on return from a stack dummy routine,
3212 or if the program has exited. */
3214 if (!stop_stack_dummy
)
3216 select_frame (get_current_frame ());
3218 /* Print current location without a level number, if
3219 we have changed functions or hit a breakpoint.
3220 Print source line if we have one.
3221 bpstat_print() contains the logic deciding in detail
3222 what to print, based on the event(s) that just occurred. */
3224 if (stop_print_frame
)
3228 int do_frame_printing
= 1;
3230 bpstat_ret
= bpstat_print (stop_bpstat
);
3234 /* If we had hit a shared library event breakpoint,
3235 bpstat_print would print out this message. If we hit
3236 an OS-level shared library event, do the same
3238 if (last
.kind
== TARGET_WAITKIND_LOADED
)
3240 printf_filtered (_("Stopped due to shared library event\n"));
3241 source_flag
= SRC_LINE
; /* something bogus */
3242 do_frame_printing
= 0;
3246 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3247 (or should) carry around the function and does (or
3248 should) use that when doing a frame comparison. */
3250 && frame_id_eq (step_frame_id
,
3251 get_frame_id (get_current_frame ()))
3252 && step_start_function
== find_pc_function (stop_pc
))
3253 source_flag
= SRC_LINE
; /* finished step, just print source line */
3255 source_flag
= SRC_AND_LOC
; /* print location and source line */
3257 case PRINT_SRC_AND_LOC
:
3258 source_flag
= SRC_AND_LOC
; /* print location and source line */
3260 case PRINT_SRC_ONLY
:
3261 source_flag
= SRC_LINE
;
3264 source_flag
= SRC_LINE
; /* something bogus */
3265 do_frame_printing
= 0;
3268 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3271 if (ui_out_is_mi_like_p (uiout
))
3272 ui_out_field_int (uiout
, "thread-id",
3273 pid_to_thread_id (inferior_ptid
));
3274 /* The behavior of this routine with respect to the source
3276 SRC_LINE: Print only source line
3277 LOCATION: Print only location
3278 SRC_AND_LOC: Print location and source line */
3279 if (do_frame_printing
)
3280 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3282 /* Display the auto-display expressions. */
3287 /* Save the function value return registers, if we care.
3288 We might be about to restore their previous contents. */
3289 if (proceed_to_finish
)
3291 /* This should not be necessary. */
3293 regcache_xfree (stop_registers
);
3295 /* NB: The copy goes through to the target picking up the value of
3296 all the registers. */
3297 stop_registers
= regcache_dup (get_current_regcache ());
3300 if (stop_stack_dummy
)
3302 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3303 ends with a setting of the current frame, so we can use that
3305 frame_pop (get_current_frame ());
3306 /* Set stop_pc to what it was before we called the function.
3307 Can't rely on restore_inferior_status because that only gets
3308 called if we don't stop in the called function. */
3309 stop_pc
= read_pc ();
3310 select_frame (get_current_frame ());
3314 annotate_stopped ();
3315 observer_notify_normal_stop (stop_bpstat
);
3319 hook_stop_stub (void *cmd
)
3321 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3326 signal_stop_state (int signo
)
3328 return signal_stop
[signo
];
3332 signal_print_state (int signo
)
3334 return signal_print
[signo
];
3338 signal_pass_state (int signo
)
3340 return signal_program
[signo
];
3344 signal_stop_update (int signo
, int state
)
3346 int ret
= signal_stop
[signo
];
3347 signal_stop
[signo
] = state
;
3352 signal_print_update (int signo
, int state
)
3354 int ret
= signal_print
[signo
];
3355 signal_print
[signo
] = state
;
3360 signal_pass_update (int signo
, int state
)
3362 int ret
= signal_program
[signo
];
3363 signal_program
[signo
] = state
;
3368 sig_print_header (void)
3370 printf_filtered (_("\
3371 Signal Stop\tPrint\tPass to program\tDescription\n"));
3375 sig_print_info (enum target_signal oursig
)
3377 char *name
= target_signal_to_name (oursig
);
3378 int name_padding
= 13 - strlen (name
);
3380 if (name_padding
<= 0)
3383 printf_filtered ("%s", name
);
3384 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3385 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3386 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3387 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3388 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3391 /* Specify how various signals in the inferior should be handled. */
3394 handle_command (char *args
, int from_tty
)
3397 int digits
, wordlen
;
3398 int sigfirst
, signum
, siglast
;
3399 enum target_signal oursig
;
3402 unsigned char *sigs
;
3403 struct cleanup
*old_chain
;
3407 error_no_arg (_("signal to handle"));
3410 /* Allocate and zero an array of flags for which signals to handle. */
3412 nsigs
= (int) TARGET_SIGNAL_LAST
;
3413 sigs
= (unsigned char *) alloca (nsigs
);
3414 memset (sigs
, 0, nsigs
);
3416 /* Break the command line up into args. */
3418 argv
= buildargv (args
);
3423 old_chain
= make_cleanup_freeargv (argv
);
3425 /* Walk through the args, looking for signal oursigs, signal names, and
3426 actions. Signal numbers and signal names may be interspersed with
3427 actions, with the actions being performed for all signals cumulatively
3428 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3430 while (*argv
!= NULL
)
3432 wordlen
= strlen (*argv
);
3433 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3437 sigfirst
= siglast
= -1;
3439 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3441 /* Apply action to all signals except those used by the
3442 debugger. Silently skip those. */
3445 siglast
= nsigs
- 1;
3447 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3449 SET_SIGS (nsigs
, sigs
, signal_stop
);
3450 SET_SIGS (nsigs
, sigs
, signal_print
);
3452 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3454 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3456 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3458 SET_SIGS (nsigs
, sigs
, signal_print
);
3460 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3462 SET_SIGS (nsigs
, sigs
, signal_program
);
3464 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3466 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3468 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3470 SET_SIGS (nsigs
, sigs
, signal_program
);
3472 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3474 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3475 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3477 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3479 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3481 else if (digits
> 0)
3483 /* It is numeric. The numeric signal refers to our own
3484 internal signal numbering from target.h, not to host/target
3485 signal number. This is a feature; users really should be
3486 using symbolic names anyway, and the common ones like
3487 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3489 sigfirst
= siglast
= (int)
3490 target_signal_from_command (atoi (*argv
));
3491 if ((*argv
)[digits
] == '-')
3494 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3496 if (sigfirst
> siglast
)
3498 /* Bet he didn't figure we'd think of this case... */
3506 oursig
= target_signal_from_name (*argv
);
3507 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3509 sigfirst
= siglast
= (int) oursig
;
3513 /* Not a number and not a recognized flag word => complain. */
3514 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
3518 /* If any signal numbers or symbol names were found, set flags for
3519 which signals to apply actions to. */
3521 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3523 switch ((enum target_signal
) signum
)
3525 case TARGET_SIGNAL_TRAP
:
3526 case TARGET_SIGNAL_INT
:
3527 if (!allsigs
&& !sigs
[signum
])
3529 if (query ("%s is used by the debugger.\n\
3530 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3536 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3537 gdb_flush (gdb_stdout
);
3541 case TARGET_SIGNAL_0
:
3542 case TARGET_SIGNAL_DEFAULT
:
3543 case TARGET_SIGNAL_UNKNOWN
:
3544 /* Make sure that "all" doesn't print these. */
3555 target_notice_signals (inferior_ptid
);
3559 /* Show the results. */
3560 sig_print_header ();
3561 for (signum
= 0; signum
< nsigs
; signum
++)
3565 sig_print_info (signum
);
3570 do_cleanups (old_chain
);
3574 xdb_handle_command (char *args
, int from_tty
)
3577 struct cleanup
*old_chain
;
3579 /* Break the command line up into args. */
3581 argv
= buildargv (args
);
3586 old_chain
= make_cleanup_freeargv (argv
);
3587 if (argv
[1] != (char *) NULL
)
3592 bufLen
= strlen (argv
[0]) + 20;
3593 argBuf
= (char *) xmalloc (bufLen
);
3597 enum target_signal oursig
;
3599 oursig
= target_signal_from_name (argv
[0]);
3600 memset (argBuf
, 0, bufLen
);
3601 if (strcmp (argv
[1], "Q") == 0)
3602 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3605 if (strcmp (argv
[1], "s") == 0)
3607 if (!signal_stop
[oursig
])
3608 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3610 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3612 else if (strcmp (argv
[1], "i") == 0)
3614 if (!signal_program
[oursig
])
3615 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3617 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3619 else if (strcmp (argv
[1], "r") == 0)
3621 if (!signal_print
[oursig
])
3622 sprintf (argBuf
, "%s %s", argv
[0], "print");
3624 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3630 handle_command (argBuf
, from_tty
);
3632 printf_filtered (_("Invalid signal handling flag.\n"));
3637 do_cleanups (old_chain
);
3640 /* Print current contents of the tables set by the handle command.
3641 It is possible we should just be printing signals actually used
3642 by the current target (but for things to work right when switching
3643 targets, all signals should be in the signal tables). */
3646 signals_info (char *signum_exp
, int from_tty
)
3648 enum target_signal oursig
;
3649 sig_print_header ();
3653 /* First see if this is a symbol name. */
3654 oursig
= target_signal_from_name (signum_exp
);
3655 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3657 /* No, try numeric. */
3659 target_signal_from_command (parse_and_eval_long (signum_exp
));
3661 sig_print_info (oursig
);
3665 printf_filtered ("\n");
3666 /* These ugly casts brought to you by the native VAX compiler. */
3667 for (oursig
= TARGET_SIGNAL_FIRST
;
3668 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3669 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3673 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3674 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3675 sig_print_info (oursig
);
3678 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3681 struct inferior_status
3683 enum target_signal stop_signal
;
3687 int stop_stack_dummy
;
3688 int stopped_by_random_signal
;
3689 int stepping_over_breakpoint
;
3690 CORE_ADDR step_range_start
;
3691 CORE_ADDR step_range_end
;
3692 struct frame_id step_frame_id
;
3693 enum step_over_calls_kind step_over_calls
;
3694 CORE_ADDR step_resume_break_address
;
3695 int stop_after_trap
;
3698 /* These are here because if call_function_by_hand has written some
3699 registers and then decides to call error(), we better not have changed
3701 struct regcache
*registers
;
3703 /* A frame unique identifier. */
3704 struct frame_id selected_frame_id
;
3706 int breakpoint_proceeded
;
3707 int restore_stack_info
;
3708 int proceed_to_finish
;
3712 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3715 int size
= register_size (current_gdbarch
, regno
);
3716 void *buf
= alloca (size
);
3717 store_signed_integer (buf
, size
, val
);
3718 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3721 /* Save all of the information associated with the inferior<==>gdb
3722 connection. INF_STATUS is a pointer to a "struct inferior_status"
3723 (defined in inferior.h). */
3725 struct inferior_status
*
3726 save_inferior_status (int restore_stack_info
)
3728 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3730 inf_status
->stop_signal
= stop_signal
;
3731 inf_status
->stop_pc
= stop_pc
;
3732 inf_status
->stop_step
= stop_step
;
3733 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3734 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3735 inf_status
->stepping_over_breakpoint
= stepping_over_breakpoint
;
3736 inf_status
->step_range_start
= step_range_start
;
3737 inf_status
->step_range_end
= step_range_end
;
3738 inf_status
->step_frame_id
= step_frame_id
;
3739 inf_status
->step_over_calls
= step_over_calls
;
3740 inf_status
->stop_after_trap
= stop_after_trap
;
3741 inf_status
->stop_soon
= stop_soon
;
3742 /* Save original bpstat chain here; replace it with copy of chain.
3743 If caller's caller is walking the chain, they'll be happier if we
3744 hand them back the original chain when restore_inferior_status is
3746 inf_status
->stop_bpstat
= stop_bpstat
;
3747 stop_bpstat
= bpstat_copy (stop_bpstat
);
3748 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3749 inf_status
->restore_stack_info
= restore_stack_info
;
3750 inf_status
->proceed_to_finish
= proceed_to_finish
;
3752 inf_status
->registers
= regcache_dup (get_current_regcache ());
3754 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
3759 restore_selected_frame (void *args
)
3761 struct frame_id
*fid
= (struct frame_id
*) args
;
3762 struct frame_info
*frame
;
3764 frame
= frame_find_by_id (*fid
);
3766 /* If inf_status->selected_frame_id is NULL, there was no previously
3770 warning (_("Unable to restore previously selected frame."));
3774 select_frame (frame
);
3780 restore_inferior_status (struct inferior_status
*inf_status
)
3782 stop_signal
= inf_status
->stop_signal
;
3783 stop_pc
= inf_status
->stop_pc
;
3784 stop_step
= inf_status
->stop_step
;
3785 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3786 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3787 stepping_over_breakpoint
= inf_status
->stepping_over_breakpoint
;
3788 step_range_start
= inf_status
->step_range_start
;
3789 step_range_end
= inf_status
->step_range_end
;
3790 step_frame_id
= inf_status
->step_frame_id
;
3791 step_over_calls
= inf_status
->step_over_calls
;
3792 stop_after_trap
= inf_status
->stop_after_trap
;
3793 stop_soon
= inf_status
->stop_soon
;
3794 bpstat_clear (&stop_bpstat
);
3795 stop_bpstat
= inf_status
->stop_bpstat
;
3796 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3797 proceed_to_finish
= inf_status
->proceed_to_finish
;
3799 /* The inferior can be gone if the user types "print exit(0)"
3800 (and perhaps other times). */
3801 if (target_has_execution
)
3802 /* NB: The register write goes through to the target. */
3803 regcache_cpy (get_current_regcache (), inf_status
->registers
);
3804 regcache_xfree (inf_status
->registers
);
3806 /* FIXME: If we are being called after stopping in a function which
3807 is called from gdb, we should not be trying to restore the
3808 selected frame; it just prints a spurious error message (The
3809 message is useful, however, in detecting bugs in gdb (like if gdb
3810 clobbers the stack)). In fact, should we be restoring the
3811 inferior status at all in that case? . */
3813 if (target_has_stack
&& inf_status
->restore_stack_info
)
3815 /* The point of catch_errors is that if the stack is clobbered,
3816 walking the stack might encounter a garbage pointer and
3817 error() trying to dereference it. */
3819 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3820 "Unable to restore previously selected frame:\n",
3821 RETURN_MASK_ERROR
) == 0)
3822 /* Error in restoring the selected frame. Select the innermost
3824 select_frame (get_current_frame ());
3832 do_restore_inferior_status_cleanup (void *sts
)
3834 restore_inferior_status (sts
);
3838 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3840 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3844 discard_inferior_status (struct inferior_status
*inf_status
)
3846 /* See save_inferior_status for info on stop_bpstat. */
3847 bpstat_clear (&inf_status
->stop_bpstat
);
3848 regcache_xfree (inf_status
->registers
);
3853 inferior_has_forked (int pid
, int *child_pid
)
3855 struct target_waitstatus last
;
3858 get_last_target_status (&last_ptid
, &last
);
3860 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3863 if (ptid_get_pid (last_ptid
) != pid
)
3866 *child_pid
= last
.value
.related_pid
;
3871 inferior_has_vforked (int pid
, int *child_pid
)
3873 struct target_waitstatus last
;
3876 get_last_target_status (&last_ptid
, &last
);
3878 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3881 if (ptid_get_pid (last_ptid
) != pid
)
3884 *child_pid
= last
.value
.related_pid
;
3889 inferior_has_execd (int pid
, char **execd_pathname
)
3891 struct target_waitstatus last
;
3894 get_last_target_status (&last_ptid
, &last
);
3896 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3899 if (ptid_get_pid (last_ptid
) != pid
)
3902 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3906 /* Oft used ptids */
3908 ptid_t minus_one_ptid
;
3910 /* Create a ptid given the necessary PID, LWP, and TID components. */
3913 ptid_build (int pid
, long lwp
, long tid
)
3923 /* Create a ptid from just a pid. */
3926 pid_to_ptid (int pid
)
3928 return ptid_build (pid
, 0, 0);
3931 /* Fetch the pid (process id) component from a ptid. */
3934 ptid_get_pid (ptid_t ptid
)
3939 /* Fetch the lwp (lightweight process) component from a ptid. */
3942 ptid_get_lwp (ptid_t ptid
)
3947 /* Fetch the tid (thread id) component from a ptid. */
3950 ptid_get_tid (ptid_t ptid
)
3955 /* ptid_equal() is used to test equality of two ptids. */
3958 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3960 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3961 && ptid1
.tid
== ptid2
.tid
);
3964 /* restore_inferior_ptid() will be used by the cleanup machinery
3965 to restore the inferior_ptid value saved in a call to
3966 save_inferior_ptid(). */
3969 restore_inferior_ptid (void *arg
)
3971 ptid_t
*saved_ptid_ptr
= arg
;
3972 inferior_ptid
= *saved_ptid_ptr
;
3976 /* Save the value of inferior_ptid so that it may be restored by a
3977 later call to do_cleanups(). Returns the struct cleanup pointer
3978 needed for later doing the cleanup. */
3981 save_inferior_ptid (void)
3983 ptid_t
*saved_ptid_ptr
;
3985 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3986 *saved_ptid_ptr
= inferior_ptid
;
3987 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3992 _initialize_infrun (void)
3996 struct cmd_list_element
*c
;
3998 add_info ("signals", signals_info
, _("\
3999 What debugger does when program gets various signals.\n\
4000 Specify a signal as argument to print info on that signal only."));
4001 add_info_alias ("handle", "signals", 0);
4003 add_com ("handle", class_run
, handle_command
, _("\
4004 Specify how to handle a signal.\n\
4005 Args are signals and actions to apply to those signals.\n\
4006 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4007 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4008 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4009 The special arg \"all\" is recognized to mean all signals except those\n\
4010 used by the debugger, typically SIGTRAP and SIGINT.\n\
4011 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4012 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4013 Stop means reenter debugger if this signal happens (implies print).\n\
4014 Print means print a message if this signal happens.\n\
4015 Pass means let program see this signal; otherwise program doesn't know.\n\
4016 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4017 Pass and Stop may be combined."));
4020 add_com ("lz", class_info
, signals_info
, _("\
4021 What debugger does when program gets various signals.\n\
4022 Specify a signal as argument to print info on that signal only."));
4023 add_com ("z", class_run
, xdb_handle_command
, _("\
4024 Specify how to handle a signal.\n\
4025 Args are signals and actions to apply to those signals.\n\
4026 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4027 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4028 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4029 The special arg \"all\" is recognized to mean all signals except those\n\
4030 used by the debugger, typically SIGTRAP and SIGINT.\n\
4031 Recognized actions include \"s\" (toggles between stop and nostop), \n\
4032 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4033 nopass), \"Q\" (noprint)\n\
4034 Stop means reenter debugger if this signal happens (implies print).\n\
4035 Print means print a message if this signal happens.\n\
4036 Pass means let program see this signal; otherwise program doesn't know.\n\
4037 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4038 Pass and Stop may be combined."));
4042 stop_command
= add_cmd ("stop", class_obscure
,
4043 not_just_help_class_command
, _("\
4044 There is no `stop' command, but you can set a hook on `stop'.\n\
4045 This allows you to set a list of commands to be run each time execution\n\
4046 of the program stops."), &cmdlist
);
4048 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
4049 Set inferior debugging."), _("\
4050 Show inferior debugging."), _("\
4051 When non-zero, inferior specific debugging is enabled."),
4054 &setdebuglist
, &showdebuglist
);
4056 numsigs
= (int) TARGET_SIGNAL_LAST
;
4057 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4058 signal_print
= (unsigned char *)
4059 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4060 signal_program
= (unsigned char *)
4061 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4062 for (i
= 0; i
< numsigs
; i
++)
4065 signal_print
[i
] = 1;
4066 signal_program
[i
] = 1;
4069 /* Signals caused by debugger's own actions
4070 should not be given to the program afterwards. */
4071 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4072 signal_program
[TARGET_SIGNAL_INT
] = 0;
4074 /* Signals that are not errors should not normally enter the debugger. */
4075 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4076 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4077 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4078 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4079 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4080 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4081 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4082 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4083 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4084 signal_print
[TARGET_SIGNAL_IO
] = 0;
4085 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4086 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4087 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4088 signal_print
[TARGET_SIGNAL_URG
] = 0;
4089 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4090 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4092 /* These signals are used internally by user-level thread
4093 implementations. (See signal(5) on Solaris.) Like the above
4094 signals, a healthy program receives and handles them as part of
4095 its normal operation. */
4096 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4097 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4098 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4099 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4100 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4101 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4103 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
4104 &stop_on_solib_events
, _("\
4105 Set stopping for shared library events."), _("\
4106 Show stopping for shared library events."), _("\
4107 If nonzero, gdb will give control to the user when the dynamic linker\n\
4108 notifies gdb of shared library events. The most common event of interest\n\
4109 to the user would be loading/unloading of a new library."),
4111 show_stop_on_solib_events
,
4112 &setlist
, &showlist
);
4114 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
4115 follow_fork_mode_kind_names
,
4116 &follow_fork_mode_string
, _("\
4117 Set debugger response to a program call of fork or vfork."), _("\
4118 Show debugger response to a program call of fork or vfork."), _("\
4119 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4120 parent - the original process is debugged after a fork\n\
4121 child - the new process is debugged after a fork\n\
4122 The unfollowed process will continue to run.\n\
4123 By default, the debugger will follow the parent process."),
4125 show_follow_fork_mode_string
,
4126 &setlist
, &showlist
);
4128 add_setshow_enum_cmd ("scheduler-locking", class_run
,
4129 scheduler_enums
, &scheduler_mode
, _("\
4130 Set mode for locking scheduler during execution."), _("\
4131 Show mode for locking scheduler during execution."), _("\
4132 off == no locking (threads may preempt at any time)\n\
4133 on == full locking (no thread except the current thread may run)\n\
4134 step == scheduler locked during every single-step operation.\n\
4135 In this mode, no other thread may run during a step command.\n\
4136 Other threads may run while stepping over a function call ('next')."),
4137 set_schedlock_func
, /* traps on target vector */
4138 show_scheduler_mode
,
4139 &setlist
, &showlist
);
4141 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
4142 Set mode of the step operation."), _("\
4143 Show mode of the step operation."), _("\
4144 When set, doing a step over a function without debug line information\n\
4145 will stop at the first instruction of that function. Otherwise, the\n\
4146 function is skipped and the step command stops at a different source line."),
4148 show_step_stop_if_no_debug
,
4149 &setlist
, &showlist
);
4151 /* ptid initializations */
4152 null_ptid
= ptid_build (0, 0, 0);
4153 minus_one_ptid
= ptid_build (-1, 0, 0);
4154 inferior_ptid
= null_ptid
;
4155 target_last_wait_ptid
= minus_one_ptid
;