1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
6 Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
26 #include "gdb_string.h"
31 #include "exceptions.h"
32 #include "breakpoint.h"
36 #include "cli/cli-script.h"
38 #include "gdbthread.h"
51 #include "gdb_assert.h"
52 #include "mi/mi-common.h"
54 /* Prototypes for local functions */
56 static void signals_info (char *, int);
58 static void handle_command (char *, int);
60 static void sig_print_info (enum target_signal
);
62 static void sig_print_header (void);
64 static void resume_cleanups (void *);
66 static int hook_stop_stub (void *);
68 static int restore_selected_frame (void *);
70 static void build_infrun (void);
72 static int follow_fork (void);
74 static void set_schedlock_func (char *args
, int from_tty
,
75 struct cmd_list_element
*c
);
77 struct execution_control_state
;
79 static int currently_stepping (struct execution_control_state
*ecs
);
81 static void xdb_handle_command (char *args
, int from_tty
);
83 static int prepare_to_proceed (void);
85 void _initialize_infrun (void);
87 int inferior_ignoring_startup_exec_events
= 0;
88 int inferior_ignoring_leading_exec_events
= 0;
90 /* When set, stop the 'step' command if we enter a function which has
91 no line number information. The normal behavior is that we step
92 over such function. */
93 int step_stop_if_no_debug
= 0;
95 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
96 struct cmd_list_element
*c
, const char *value
)
98 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
101 /* In asynchronous mode, but simulating synchronous execution. */
103 int sync_execution
= 0;
105 /* wait_for_inferior and normal_stop use this to notify the user
106 when the inferior stopped in a different thread than it had been
109 static ptid_t previous_inferior_ptid
;
111 /* This is true for configurations that may follow through execl() and
112 similar functions. At present this is only true for HP-UX native. */
114 #ifndef MAY_FOLLOW_EXEC
115 #define MAY_FOLLOW_EXEC (0)
118 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
120 static int debug_infrun
= 0;
122 show_debug_infrun (struct ui_file
*file
, int from_tty
,
123 struct cmd_list_element
*c
, const char *value
)
125 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
128 /* If the program uses ELF-style shared libraries, then calls to
129 functions in shared libraries go through stubs, which live in a
130 table called the PLT (Procedure Linkage Table). The first time the
131 function is called, the stub sends control to the dynamic linker,
132 which looks up the function's real address, patches the stub so
133 that future calls will go directly to the function, and then passes
134 control to the function.
136 If we are stepping at the source level, we don't want to see any of
137 this --- we just want to skip over the stub and the dynamic linker.
138 The simple approach is to single-step until control leaves the
141 However, on some systems (e.g., Red Hat's 5.2 distribution) the
142 dynamic linker calls functions in the shared C library, so you
143 can't tell from the PC alone whether the dynamic linker is still
144 running. In this case, we use a step-resume breakpoint to get us
145 past the dynamic linker, as if we were using "next" to step over a
148 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
149 linker code or not. Normally, this means we single-step. However,
150 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
151 address where we can place a step-resume breakpoint to get past the
152 linker's symbol resolution function.
154 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
155 pretty portable way, by comparing the PC against the address ranges
156 of the dynamic linker's sections.
158 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
159 it depends on internal details of the dynamic linker. It's usually
160 not too hard to figure out where to put a breakpoint, but it
161 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
162 sanity checking. If it can't figure things out, returning zero and
163 getting the (possibly confusing) stepping behavior is better than
164 signalling an error, which will obscure the change in the
167 /* This function returns TRUE if pc is the address of an instruction
168 that lies within the dynamic linker (such as the event hook, or the
171 This function must be used only when a dynamic linker event has
172 been caught, and the inferior is being stepped out of the hook, or
173 undefined results are guaranteed. */
175 #ifndef SOLIB_IN_DYNAMIC_LINKER
176 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
179 /* We can't step off a permanent breakpoint in the ordinary way, because we
180 can't remove it. Instead, we have to advance the PC to the next
181 instruction. This macro should expand to a pointer to a function that
182 does that, or zero if we have no such function. If we don't have a
183 definition for it, we have to report an error. */
184 #ifndef SKIP_PERMANENT_BREAKPOINT
185 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
187 default_skip_permanent_breakpoint (void)
190 The program is stopped at a permanent breakpoint, but GDB does not know\n\
191 how to step past a permanent breakpoint on this architecture. Try using\n\
192 a command like `return' or `jump' to continue execution."));
197 /* Convert the #defines into values. This is temporary until wfi control
198 flow is completely sorted out. */
200 #ifndef HAVE_STEPPABLE_WATCHPOINT
201 #define HAVE_STEPPABLE_WATCHPOINT 0
203 #undef HAVE_STEPPABLE_WATCHPOINT
204 #define HAVE_STEPPABLE_WATCHPOINT 1
207 #ifndef CANNOT_STEP_HW_WATCHPOINTS
208 #define CANNOT_STEP_HW_WATCHPOINTS 0
210 #undef CANNOT_STEP_HW_WATCHPOINTS
211 #define CANNOT_STEP_HW_WATCHPOINTS 1
214 /* Tables of how to react to signals; the user sets them. */
216 static unsigned char *signal_stop
;
217 static unsigned char *signal_print
;
218 static unsigned char *signal_program
;
220 #define SET_SIGS(nsigs,sigs,flags) \
222 int signum = (nsigs); \
223 while (signum-- > 0) \
224 if ((sigs)[signum]) \
225 (flags)[signum] = 1; \
228 #define UNSET_SIGS(nsigs,sigs,flags) \
230 int signum = (nsigs); \
231 while (signum-- > 0) \
232 if ((sigs)[signum]) \
233 (flags)[signum] = 0; \
236 /* Value to pass to target_resume() to cause all threads to resume */
238 #define RESUME_ALL (pid_to_ptid (-1))
240 /* Command list pointer for the "stop" placeholder. */
242 static struct cmd_list_element
*stop_command
;
244 /* Nonzero if breakpoints are now inserted in the inferior. */
246 static int breakpoints_inserted
;
248 /* Function inferior was in as of last step command. */
250 static struct symbol
*step_start_function
;
252 /* Nonzero if we are expecting a trace trap and should proceed from it. */
254 static int trap_expected
;
256 /* Nonzero if we want to give control to the user when we're notified
257 of shared library events by the dynamic linker. */
258 static int stop_on_solib_events
;
260 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
261 struct cmd_list_element
*c
, const char *value
)
263 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
267 /* Nonzero means expecting a trace trap
268 and should stop the inferior and return silently when it happens. */
272 /* Nonzero means expecting a trap and caller will handle it themselves.
273 It is used after attach, due to attaching to a process;
274 when running in the shell before the child program has been exec'd;
275 and when running some kinds of remote stuff (FIXME?). */
277 enum stop_kind stop_soon
;
279 /* Nonzero if proceed is being used for a "finish" command or a similar
280 situation when stop_registers should be saved. */
282 int proceed_to_finish
;
284 /* Save register contents here when about to pop a stack dummy frame,
285 if-and-only-if proceed_to_finish is set.
286 Thus this contains the return value from the called function (assuming
287 values are returned in a register). */
289 struct regcache
*stop_registers
;
291 /* Nonzero if program stopped due to error trying to insert breakpoints. */
293 static int breakpoints_failed
;
295 /* Nonzero after stop if current stack frame should be printed. */
297 static int stop_print_frame
;
299 static struct breakpoint
*step_resume_breakpoint
= NULL
;
301 /* This is a cached copy of the pid/waitstatus of the last event
302 returned by target_wait()/deprecated_target_wait_hook(). This
303 information is returned by get_last_target_status(). */
304 static ptid_t target_last_wait_ptid
;
305 static struct target_waitstatus target_last_waitstatus
;
307 /* This is used to remember when a fork, vfork or exec event
308 was caught by a catchpoint, and thus the event is to be
309 followed at the next resume of the inferior, and not
313 enum target_waitkind kind
;
320 char *execd_pathname
;
324 static const char follow_fork_mode_child
[] = "child";
325 static const char follow_fork_mode_parent
[] = "parent";
327 static const char *follow_fork_mode_kind_names
[] = {
328 follow_fork_mode_child
,
329 follow_fork_mode_parent
,
333 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
335 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
336 struct cmd_list_element
*c
, const char *value
)
338 fprintf_filtered (file
, _("\
339 Debugger response to a program call of fork or vfork is \"%s\".\n"),
347 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
349 return target_follow_fork (follow_child
);
353 follow_inferior_reset_breakpoints (void)
355 /* Was there a step_resume breakpoint? (There was if the user
356 did a "next" at the fork() call.) If so, explicitly reset its
359 step_resumes are a form of bp that are made to be per-thread.
360 Since we created the step_resume bp when the parent process
361 was being debugged, and now are switching to the child process,
362 from the breakpoint package's viewpoint, that's a switch of
363 "threads". We must update the bp's notion of which thread
364 it is for, or it'll be ignored when it triggers. */
366 if (step_resume_breakpoint
)
367 breakpoint_re_set_thread (step_resume_breakpoint
);
369 /* Reinsert all breakpoints in the child. The user may have set
370 breakpoints after catching the fork, in which case those
371 were never set in the child, but only in the parent. This makes
372 sure the inserted breakpoints match the breakpoint list. */
374 breakpoint_re_set ();
375 insert_breakpoints ();
378 /* EXECD_PATHNAME is assumed to be non-NULL. */
381 follow_exec (int pid
, char *execd_pathname
)
384 struct target_ops
*tgt
;
386 if (!may_follow_exec
)
389 /* This is an exec event that we actually wish to pay attention to.
390 Refresh our symbol table to the newly exec'd program, remove any
393 If there are breakpoints, they aren't really inserted now,
394 since the exec() transformed our inferior into a fresh set
397 We want to preserve symbolic breakpoints on the list, since
398 we have hopes that they can be reset after the new a.out's
399 symbol table is read.
401 However, any "raw" breakpoints must be removed from the list
402 (e.g., the solib bp's), since their address is probably invalid
405 And, we DON'T want to call delete_breakpoints() here, since
406 that may write the bp's "shadow contents" (the instruction
407 value that was overwritten witha TRAP instruction). Since
408 we now have a new a.out, those shadow contents aren't valid. */
409 update_breakpoints_after_exec ();
411 /* If there was one, it's gone now. We cannot truly step-to-next
412 statement through an exec(). */
413 step_resume_breakpoint
= NULL
;
414 step_range_start
= 0;
417 /* What is this a.out's name? */
418 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
420 /* We've followed the inferior through an exec. Therefore, the
421 inferior has essentially been killed & reborn. */
423 /* First collect the run target in effect. */
424 tgt
= find_run_target ();
425 /* If we can't find one, things are in a very strange state... */
427 error (_("Could find run target to save before following exec"));
429 gdb_flush (gdb_stdout
);
430 target_mourn_inferior ();
431 inferior_ptid
= pid_to_ptid (saved_pid
);
432 /* Because mourn_inferior resets inferior_ptid. */
435 /* That a.out is now the one to use. */
436 exec_file_attach (execd_pathname
, 0);
438 /* And also is where symbols can be found. */
439 symbol_file_add_main (execd_pathname
, 0);
441 /* Reset the shared library package. This ensures that we get
442 a shlib event when the child reaches "_start", at which point
443 the dld will have had a chance to initialize the child. */
444 #if defined(SOLIB_RESTART)
447 #ifdef SOLIB_CREATE_INFERIOR_HOOK
448 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
450 solib_create_inferior_hook ();
453 /* Reinsert all breakpoints. (Those which were symbolic have
454 been reset to the proper address in the new a.out, thanks
455 to symbol_file_command...) */
456 insert_breakpoints ();
458 /* The next resume of this inferior should bring it to the shlib
459 startup breakpoints. (If the user had also set bp's on
460 "main" from the old (parent) process, then they'll auto-
461 matically get reset there in the new process.) */
464 /* Non-zero if we just simulating a single-step. This is needed
465 because we cannot remove the breakpoints in the inferior process
466 until after the `wait' in `wait_for_inferior'. */
467 static int singlestep_breakpoints_inserted_p
= 0;
469 /* The thread we inserted single-step breakpoints for. */
470 static ptid_t singlestep_ptid
;
472 /* If another thread hit the singlestep breakpoint, we save the original
473 thread here so that we can resume single-stepping it later. */
474 static ptid_t saved_singlestep_ptid
;
475 static int stepping_past_singlestep_breakpoint
;
478 /* Things to clean up if we QUIT out of resume (). */
480 resume_cleanups (void *ignore
)
485 static const char schedlock_off
[] = "off";
486 static const char schedlock_on
[] = "on";
487 static const char schedlock_step
[] = "step";
488 static const char *scheduler_enums
[] = {
494 static const char *scheduler_mode
= schedlock_off
;
496 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
497 struct cmd_list_element
*c
, const char *value
)
499 fprintf_filtered (file
, _("\
500 Mode for locking scheduler during execution is \"%s\".\n"),
505 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
507 if (!target_can_lock_scheduler
)
509 scheduler_mode
= schedlock_off
;
510 error (_("Target '%s' cannot support this command."), target_shortname
);
515 /* Resume the inferior, but allow a QUIT. This is useful if the user
516 wants to interrupt some lengthy single-stepping operation
517 (for child processes, the SIGINT goes to the inferior, and so
518 we get a SIGINT random_signal, but for remote debugging and perhaps
519 other targets, that's not true).
521 STEP nonzero if we should step (zero to continue instead).
522 SIG is the signal to give the inferior (zero for none). */
524 resume (int step
, enum target_signal sig
)
526 int should_resume
= 1;
527 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
531 fprintf_unfiltered (gdb_stdlog
, "infrun: resume (step=%d, signal=%d)\n",
534 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
537 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
538 over an instruction that causes a page fault without triggering
539 a hardware watchpoint. The kernel properly notices that it shouldn't
540 stop, because the hardware watchpoint is not triggered, but it forgets
541 the step request and continues the program normally.
542 Work around the problem by removing hardware watchpoints if a step is
543 requested, GDB will check for a hardware watchpoint trigger after the
545 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
546 remove_hw_watchpoints ();
549 /* Normally, by the time we reach `resume', the breakpoints are either
550 removed or inserted, as appropriate. The exception is if we're sitting
551 at a permanent breakpoint; we need to step over it, but permanent
552 breakpoints can't be removed. So we have to test for it here. */
553 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
554 SKIP_PERMANENT_BREAKPOINT ();
556 if (SOFTWARE_SINGLE_STEP_P () && step
)
558 /* Do it the hard way, w/temp breakpoints */
559 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
560 /* ...and don't ask hardware to do it. */
562 /* and do not pull these breakpoints until after a `wait' in
563 `wait_for_inferior' */
564 singlestep_breakpoints_inserted_p
= 1;
565 singlestep_ptid
= inferior_ptid
;
568 /* If there were any forks/vforks/execs that were caught and are
569 now to be followed, then do so. */
570 switch (pending_follow
.kind
)
572 case TARGET_WAITKIND_FORKED
:
573 case TARGET_WAITKIND_VFORKED
:
574 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
579 case TARGET_WAITKIND_EXECD
:
580 /* follow_exec is called as soon as the exec event is seen. */
581 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
588 /* Install inferior's terminal modes. */
589 target_terminal_inferior ();
595 resume_ptid
= RESUME_ALL
; /* Default */
597 if ((step
|| singlestep_breakpoints_inserted_p
)
598 && (stepping_past_singlestep_breakpoint
599 || (!breakpoints_inserted
&& breakpoint_here_p (read_pc ()))))
601 /* Stepping past a breakpoint without inserting breakpoints.
602 Make sure only the current thread gets to step, so that
603 other threads don't sneak past breakpoints while they are
606 resume_ptid
= inferior_ptid
;
609 if ((scheduler_mode
== schedlock_on
)
610 || (scheduler_mode
== schedlock_step
611 && (step
|| singlestep_breakpoints_inserted_p
)))
613 /* User-settable 'scheduler' mode requires solo thread resume. */
614 resume_ptid
= inferior_ptid
;
617 if (CANNOT_STEP_BREAKPOINT
)
619 /* Most targets can step a breakpoint instruction, thus
620 executing it normally. But if this one cannot, just
621 continue and we will hit it anyway. */
622 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
625 target_resume (resume_ptid
, step
, sig
);
628 discard_cleanups (old_cleanups
);
632 /* Clear out all variables saying what to do when inferior is continued.
633 First do this, then set the ones you want, then call `proceed'. */
636 clear_proceed_status (void)
639 step_range_start
= 0;
641 step_frame_id
= null_frame_id
;
642 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
644 stop_soon
= NO_STOP_QUIETLY
;
645 proceed_to_finish
= 0;
646 breakpoint_proceeded
= 1; /* We're about to proceed... */
648 /* Discard any remaining commands or status from previous stop. */
649 bpstat_clear (&stop_bpstat
);
652 /* This should be suitable for any targets that support threads. */
655 prepare_to_proceed (void)
658 struct target_waitstatus wait_status
;
660 /* Get the last target status returned by target_wait(). */
661 get_last_target_status (&wait_ptid
, &wait_status
);
663 /* Make sure we were stopped either at a breakpoint, or because
665 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
666 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
667 && wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
672 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
673 && !ptid_equal (inferior_ptid
, wait_ptid
))
675 /* Switched over from WAIT_PID. */
676 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
678 if (wait_pc
!= read_pc ())
680 /* Switch back to WAIT_PID thread. */
681 inferior_ptid
= wait_ptid
;
683 /* FIXME: This stuff came from switch_to_thread() in
684 thread.c (which should probably be a public function). */
685 flush_cached_frames ();
686 registers_changed ();
688 select_frame (get_current_frame ());
691 /* We return 1 to indicate that there is a breakpoint here,
692 so we need to step over it before continuing to avoid
693 hitting it straight away. */
694 if (breakpoint_here_p (wait_pc
))
702 /* Record the pc of the program the last time it stopped. This is
703 just used internally by wait_for_inferior, but need to be preserved
704 over calls to it and cleared when the inferior is started. */
705 static CORE_ADDR prev_pc
;
707 /* Basic routine for continuing the program in various fashions.
709 ADDR is the address to resume at, or -1 for resume where stopped.
710 SIGGNAL is the signal to give it, or 0 for none,
711 or -1 for act according to how it stopped.
712 STEP is nonzero if should trap after one instruction.
713 -1 means return after that and print nothing.
714 You should probably set various step_... variables
715 before calling here, if you are stepping.
717 You should call clear_proceed_status before calling proceed. */
720 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
725 step_start_function
= find_pc_function (read_pc ());
729 if (addr
== (CORE_ADDR
) -1)
731 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
732 /* There is a breakpoint at the address we will resume at,
733 step one instruction before inserting breakpoints so that
734 we do not stop right away (and report a second hit at this
737 else if (gdbarch_single_step_through_delay_p (current_gdbarch
)
738 && gdbarch_single_step_through_delay (current_gdbarch
,
739 get_current_frame ()))
740 /* We stepped onto an instruction that needs to be stepped
741 again before re-inserting the breakpoint, do so. */
750 fprintf_unfiltered (gdb_stdlog
,
751 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
752 paddr_nz (addr
), siggnal
, step
);
754 /* In a multi-threaded task we may select another thread
755 and then continue or step.
757 But if the old thread was stopped at a breakpoint, it
758 will immediately cause another breakpoint stop without
759 any execution (i.e. it will report a breakpoint hit
760 incorrectly). So we must step over it first.
762 prepare_to_proceed checks the current thread against the thread
763 that reported the most recent event. If a step-over is required
764 it returns TRUE and sets the current thread to the old thread. */
765 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
769 /* We will get a trace trap after one instruction.
770 Continue it automatically and insert breakpoints then. */
774 insert_breakpoints ();
775 /* If we get here there was no call to error() in
776 insert breakpoints -- so they were inserted. */
777 breakpoints_inserted
= 1;
780 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
781 stop_signal
= siggnal
;
782 /* If this signal should not be seen by program,
783 give it zero. Used for debugging signals. */
784 else if (!signal_program
[stop_signal
])
785 stop_signal
= TARGET_SIGNAL_0
;
787 annotate_starting ();
789 /* Make sure that output from GDB appears before output from the
791 gdb_flush (gdb_stdout
);
793 /* Refresh prev_pc value just prior to resuming. This used to be
794 done in stop_stepping, however, setting prev_pc there did not handle
795 scenarios such as inferior function calls or returning from
796 a function via the return command. In those cases, the prev_pc
797 value was not set properly for subsequent commands. The prev_pc value
798 is used to initialize the starting line number in the ecs. With an
799 invalid value, the gdb next command ends up stopping at the position
800 represented by the next line table entry past our start position.
801 On platforms that generate one line table entry per line, this
802 is not a problem. However, on the ia64, the compiler generates
803 extraneous line table entries that do not increase the line number.
804 When we issue the gdb next command on the ia64 after an inferior call
805 or a return command, we often end up a few instructions forward, still
806 within the original line we started.
808 An attempt was made to have init_execution_control_state () refresh
809 the prev_pc value before calculating the line number. This approach
810 did not work because on platforms that use ptrace, the pc register
811 cannot be read unless the inferior is stopped. At that point, we
812 are not guaranteed the inferior is stopped and so the read_pc ()
813 call can fail. Setting the prev_pc value here ensures the value is
814 updated correctly when the inferior is stopped. */
815 prev_pc
= read_pc ();
817 /* Resume inferior. */
818 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
820 /* Wait for it to stop (if not standalone)
821 and in any case decode why it stopped, and act accordingly. */
822 /* Do this only if we are not using the event loop, or if the target
823 does not support asynchronous execution. */
824 if (!target_can_async_p ())
826 wait_for_inferior ();
832 /* Start remote-debugging of a machine over a serial link. */
838 init_wait_for_inferior ();
839 stop_soon
= STOP_QUIETLY
;
842 /* Always go on waiting for the target, regardless of the mode. */
843 /* FIXME: cagney/1999-09-23: At present it isn't possible to
844 indicate to wait_for_inferior that a target should timeout if
845 nothing is returned (instead of just blocking). Because of this,
846 targets expecting an immediate response need to, internally, set
847 things up so that the target_wait() is forced to eventually
849 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
850 differentiate to its caller what the state of the target is after
851 the initial open has been performed. Here we're assuming that
852 the target has stopped. It should be possible to eventually have
853 target_open() return to the caller an indication that the target
854 is currently running and GDB state should be set to the same as
856 wait_for_inferior ();
860 /* Initialize static vars when a new inferior begins. */
863 init_wait_for_inferior (void)
865 /* These are meaningless until the first time through wait_for_inferior. */
868 breakpoints_inserted
= 0;
869 breakpoint_init_inferior (inf_starting
);
871 /* Don't confuse first call to proceed(). */
872 stop_signal
= TARGET_SIGNAL_0
;
874 /* The first resume is not following a fork/vfork/exec. */
875 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
877 clear_proceed_status ();
879 stepping_past_singlestep_breakpoint
= 0;
882 /* This enum encodes possible reasons for doing a target_wait, so that
883 wfi can call target_wait in one place. (Ultimately the call will be
884 moved out of the infinite loop entirely.) */
888 infwait_normal_state
,
889 infwait_thread_hop_state
,
890 infwait_nonstep_watch_state
893 /* Why did the inferior stop? Used to print the appropriate messages
894 to the interface from within handle_inferior_event(). */
895 enum inferior_stop_reason
897 /* We don't know why. */
899 /* Step, next, nexti, stepi finished. */
901 /* Found breakpoint. */
903 /* Inferior terminated by signal. */
905 /* Inferior exited. */
907 /* Inferior received signal, and user asked to be notified. */
911 /* This structure contains what used to be local variables in
912 wait_for_inferior. Probably many of them can return to being
913 locals in handle_inferior_event. */
915 struct execution_control_state
917 struct target_waitstatus ws
;
918 struct target_waitstatus
*wp
;
921 CORE_ADDR stop_func_start
;
922 CORE_ADDR stop_func_end
;
923 char *stop_func_name
;
924 struct symtab_and_line sal
;
926 struct symtab
*current_symtab
;
927 int handling_longjmp
; /* FIXME */
929 ptid_t saved_inferior_ptid
;
930 int step_after_step_resume_breakpoint
;
931 int stepping_through_solib_after_catch
;
932 bpstat stepping_through_solib_catchpoints
;
933 int new_thread_event
;
934 struct target_waitstatus tmpstatus
;
935 enum infwait_states infwait_state
;
940 void init_execution_control_state (struct execution_control_state
*ecs
);
942 void handle_inferior_event (struct execution_control_state
*ecs
);
944 static void step_into_function (struct execution_control_state
*ecs
);
945 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
946 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
947 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
948 struct frame_id sr_id
);
949 static void stop_stepping (struct execution_control_state
*ecs
);
950 static void prepare_to_wait (struct execution_control_state
*ecs
);
951 static void keep_going (struct execution_control_state
*ecs
);
952 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
955 /* Wait for control to return from inferior to debugger.
956 If inferior gets a signal, we may decide to start it up again
957 instead of returning. That is why there is a loop in this function.
958 When this function actually returns it means the inferior
959 should be left stopped and GDB should read more commands. */
962 wait_for_inferior (void)
964 struct cleanup
*old_cleanups
;
965 struct execution_control_state ecss
;
966 struct execution_control_state
*ecs
;
969 fprintf_unfiltered (gdb_stdlog
, "infrun: wait_for_inferior\n");
971 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
972 &step_resume_breakpoint
);
974 /* wfi still stays in a loop, so it's OK just to take the address of
975 a local to get the ecs pointer. */
978 /* Fill in with reasonable starting values. */
979 init_execution_control_state (ecs
);
981 /* We'll update this if & when we switch to a new thread. */
982 previous_inferior_ptid
= inferior_ptid
;
984 overlay_cache_invalid
= 1;
986 /* We have to invalidate the registers BEFORE calling target_wait
987 because they can be loaded from the target while in target_wait.
988 This makes remote debugging a bit more efficient for those
989 targets that provide critical registers as part of their normal
992 registers_changed ();
996 if (deprecated_target_wait_hook
)
997 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
999 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1001 /* Now figure out what to do with the result of the result. */
1002 handle_inferior_event (ecs
);
1004 if (!ecs
->wait_some_more
)
1007 do_cleanups (old_cleanups
);
1010 /* Asynchronous version of wait_for_inferior. It is called by the
1011 event loop whenever a change of state is detected on the file
1012 descriptor corresponding to the target. It can be called more than
1013 once to complete a single execution command. In such cases we need
1014 to keep the state in a global variable ASYNC_ECSS. If it is the
1015 last time that this function is called for a single execution
1016 command, then report to the user that the inferior has stopped, and
1017 do the necessary cleanups. */
1019 struct execution_control_state async_ecss
;
1020 struct execution_control_state
*async_ecs
;
1023 fetch_inferior_event (void *client_data
)
1025 static struct cleanup
*old_cleanups
;
1027 async_ecs
= &async_ecss
;
1029 if (!async_ecs
->wait_some_more
)
1031 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1032 &step_resume_breakpoint
);
1034 /* Fill in with reasonable starting values. */
1035 init_execution_control_state (async_ecs
);
1037 /* We'll update this if & when we switch to a new thread. */
1038 previous_inferior_ptid
= inferior_ptid
;
1040 overlay_cache_invalid
= 1;
1042 /* We have to invalidate the registers BEFORE calling target_wait
1043 because they can be loaded from the target while in target_wait.
1044 This makes remote debugging a bit more efficient for those
1045 targets that provide critical registers as part of their normal
1046 status mechanism. */
1048 registers_changed ();
1051 if (deprecated_target_wait_hook
)
1053 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1055 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1057 /* Now figure out what to do with the result of the result. */
1058 handle_inferior_event (async_ecs
);
1060 if (!async_ecs
->wait_some_more
)
1062 /* Do only the cleanups that have been added by this
1063 function. Let the continuations for the commands do the rest,
1064 if there are any. */
1065 do_exec_cleanups (old_cleanups
);
1067 if (step_multi
&& stop_step
)
1068 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1070 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1074 /* Prepare an execution control state for looping through a
1075 wait_for_inferior-type loop. */
1078 init_execution_control_state (struct execution_control_state
*ecs
)
1080 ecs
->another_trap
= 0;
1081 ecs
->random_signal
= 0;
1082 ecs
->step_after_step_resume_breakpoint
= 0;
1083 ecs
->handling_longjmp
= 0; /* FIXME */
1084 ecs
->stepping_through_solib_after_catch
= 0;
1085 ecs
->stepping_through_solib_catchpoints
= NULL
;
1086 ecs
->sal
= find_pc_line (prev_pc
, 0);
1087 ecs
->current_line
= ecs
->sal
.line
;
1088 ecs
->current_symtab
= ecs
->sal
.symtab
;
1089 ecs
->infwait_state
= infwait_normal_state
;
1090 ecs
->waiton_ptid
= pid_to_ptid (-1);
1091 ecs
->wp
= &(ecs
->ws
);
1094 /* Return the cached copy of the last pid/waitstatus returned by
1095 target_wait()/deprecated_target_wait_hook(). The data is actually
1096 cached by handle_inferior_event(), which gets called immediately
1097 after target_wait()/deprecated_target_wait_hook(). */
1100 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1102 *ptidp
= target_last_wait_ptid
;
1103 *status
= target_last_waitstatus
;
1107 nullify_last_target_wait_ptid (void)
1109 target_last_wait_ptid
= minus_one_ptid
;
1112 /* Switch thread contexts, maintaining "infrun state". */
1115 context_switch (struct execution_control_state
*ecs
)
1117 /* Caution: it may happen that the new thread (or the old one!)
1118 is not in the thread list. In this case we must not attempt
1119 to "switch context", or we run the risk that our context may
1120 be lost. This may happen as a result of the target module
1121 mishandling thread creation. */
1123 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1124 { /* Perform infrun state context switch: */
1125 /* Save infrun state for the old thread. */
1126 save_infrun_state (inferior_ptid
, prev_pc
,
1127 trap_expected
, step_resume_breakpoint
,
1129 step_range_end
, &step_frame_id
,
1130 ecs
->handling_longjmp
, ecs
->another_trap
,
1131 ecs
->stepping_through_solib_after_catch
,
1132 ecs
->stepping_through_solib_catchpoints
,
1133 ecs
->current_line
, ecs
->current_symtab
);
1135 /* Load infrun state for the new thread. */
1136 load_infrun_state (ecs
->ptid
, &prev_pc
,
1137 &trap_expected
, &step_resume_breakpoint
,
1139 &step_range_end
, &step_frame_id
,
1140 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1141 &ecs
->stepping_through_solib_after_catch
,
1142 &ecs
->stepping_through_solib_catchpoints
,
1143 &ecs
->current_line
, &ecs
->current_symtab
);
1145 inferior_ptid
= ecs
->ptid
;
1149 adjust_pc_after_break (struct execution_control_state
*ecs
)
1151 CORE_ADDR breakpoint_pc
;
1153 /* If this target does not decrement the PC after breakpoints, then
1154 we have nothing to do. */
1155 if (DECR_PC_AFTER_BREAK
== 0)
1158 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1159 we aren't, just return.
1161 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1162 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1163 by software breakpoints should be handled through the normal breakpoint
1166 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1167 different signals (SIGILL or SIGEMT for instance), but it is less
1168 clear where the PC is pointing afterwards. It may not match
1169 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1170 these signals at breakpoints (the code has been in GDB since at least
1171 1992) so I can not guess how to handle them here.
1173 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1174 would have the PC after hitting a watchpoint affected by
1175 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1176 in GDB history, and it seems unlikely to be correct, so
1177 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1179 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1182 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1185 /* Find the location where (if we've hit a breakpoint) the
1186 breakpoint would be. */
1187 breakpoint_pc
= read_pc_pid (ecs
->ptid
) - DECR_PC_AFTER_BREAK
;
1189 if (SOFTWARE_SINGLE_STEP_P ())
1191 /* When using software single-step, a SIGTRAP can only indicate
1192 an inserted breakpoint. This actually makes things
1194 if (singlestep_breakpoints_inserted_p
)
1195 /* When software single stepping, the instruction at [prev_pc]
1196 is never a breakpoint, but the instruction following
1197 [prev_pc] (in program execution order) always is. Assume
1198 that following instruction was reached and hence a software
1199 breakpoint was hit. */
1200 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1201 else if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1202 /* The inferior was free running (i.e., no single-step
1203 breakpoints inserted) and it hit a software breakpoint. */
1204 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1208 /* When using hardware single-step, a SIGTRAP is reported for
1209 both a completed single-step and a software breakpoint. Need
1210 to differentiate between the two as the latter needs
1211 adjusting but the former does not.
1213 When the thread to be examined does not match the current thread
1214 context we can't use currently_stepping, so assume no
1215 single-stepping in this case. */
1216 if (ptid_equal (ecs
->ptid
, inferior_ptid
) && currently_stepping (ecs
))
1218 if (prev_pc
== breakpoint_pc
1219 && software_breakpoint_inserted_here_p (breakpoint_pc
))
1220 /* Hardware single-stepped a software breakpoint (as
1221 occures when the inferior is resumed with PC pointing
1222 at not-yet-hit software breakpoint). Since the
1223 breakpoint really is executed, the inferior needs to be
1224 backed up to the breakpoint address. */
1225 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1229 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1230 /* The inferior was free running (i.e., no hardware
1231 single-step and no possibility of a false SIGTRAP) and
1232 hit a software breakpoint. */
1233 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1238 /* Given an execution control state that has been freshly filled in
1239 by an event from the inferior, figure out what it means and take
1240 appropriate action. */
1242 int stepped_after_stopped_by_watchpoint
;
1245 handle_inferior_event (struct execution_control_state
*ecs
)
1247 /* NOTE: bje/2005-05-02: If you're looking at this code and thinking
1248 that the variable stepped_after_stopped_by_watchpoint isn't used,
1249 then you're wrong! See remote.c:remote_stopped_data_address. */
1251 int sw_single_step_trap_p
= 0;
1252 int stopped_by_watchpoint
= -1; /* Mark as unknown. */
1254 /* Cache the last pid/waitstatus. */
1255 target_last_wait_ptid
= ecs
->ptid
;
1256 target_last_waitstatus
= *ecs
->wp
;
1258 adjust_pc_after_break (ecs
);
1260 switch (ecs
->infwait_state
)
1262 case infwait_thread_hop_state
:
1264 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1265 /* Cancel the waiton_ptid. */
1266 ecs
->waiton_ptid
= pid_to_ptid (-1);
1269 case infwait_normal_state
:
1271 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
1272 stepped_after_stopped_by_watchpoint
= 0;
1275 case infwait_nonstep_watch_state
:
1277 fprintf_unfiltered (gdb_stdlog
,
1278 "infrun: infwait_nonstep_watch_state\n");
1279 insert_breakpoints ();
1281 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1282 handle things like signals arriving and other things happening
1283 in combination correctly? */
1284 stepped_after_stopped_by_watchpoint
= 1;
1288 internal_error (__FILE__
, __LINE__
, _("bad switch"));
1290 ecs
->infwait_state
= infwait_normal_state
;
1292 flush_cached_frames ();
1294 /* If it's a new process, add it to the thread database */
1296 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1297 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1298 && !in_thread_list (ecs
->ptid
));
1300 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1301 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1303 add_thread (ecs
->ptid
);
1305 ui_out_text (uiout
, "[New ");
1306 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1307 ui_out_text (uiout
, "]\n");
1310 switch (ecs
->ws
.kind
)
1312 case TARGET_WAITKIND_LOADED
:
1314 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
1315 /* Ignore gracefully during startup of the inferior, as it
1316 might be the shell which has just loaded some objects,
1317 otherwise add the symbols for the newly loaded objects. */
1319 if (stop_soon
== NO_STOP_QUIETLY
)
1321 /* Remove breakpoints, SOLIB_ADD might adjust
1322 breakpoint addresses via breakpoint_re_set. */
1323 if (breakpoints_inserted
)
1324 remove_breakpoints ();
1326 /* Check for any newly added shared libraries if we're
1327 supposed to be adding them automatically. Switch
1328 terminal for any messages produced by
1329 breakpoint_re_set. */
1330 target_terminal_ours_for_output ();
1331 /* NOTE: cagney/2003-11-25: Make certain that the target
1332 stack's section table is kept up-to-date. Architectures,
1333 (e.g., PPC64), use the section table to perform
1334 operations such as address => section name and hence
1335 require the table to contain all sections (including
1336 those found in shared libraries). */
1337 /* NOTE: cagney/2003-11-25: Pass current_target and not
1338 exec_ops to SOLIB_ADD. This is because current GDB is
1339 only tooled to propagate section_table changes out from
1340 the "current_target" (see target_resize_to_sections), and
1341 not up from the exec stratum. This, of course, isn't
1342 right. "infrun.c" should only interact with the
1343 exec/process stratum, instead relying on the target stack
1344 to propagate relevant changes (stop, section table
1345 changed, ...) up to other layers. */
1346 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1347 target_terminal_inferior ();
1349 /* Reinsert breakpoints and continue. */
1350 if (breakpoints_inserted
)
1351 insert_breakpoints ();
1354 resume (0, TARGET_SIGNAL_0
);
1355 prepare_to_wait (ecs
);
1358 case TARGET_WAITKIND_SPURIOUS
:
1360 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1361 resume (0, TARGET_SIGNAL_0
);
1362 prepare_to_wait (ecs
);
1365 case TARGET_WAITKIND_EXITED
:
1367 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
1368 target_terminal_ours (); /* Must do this before mourn anyway */
1369 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1371 /* Record the exit code in the convenience variable $_exitcode, so
1372 that the user can inspect this again later. */
1373 set_internalvar (lookup_internalvar ("_exitcode"),
1374 value_from_longest (builtin_type_int
,
1375 (LONGEST
) ecs
->ws
.value
.integer
));
1376 gdb_flush (gdb_stdout
);
1377 target_mourn_inferior ();
1378 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1379 stop_print_frame
= 0;
1380 stop_stepping (ecs
);
1383 case TARGET_WAITKIND_SIGNALLED
:
1385 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1386 stop_print_frame
= 0;
1387 stop_signal
= ecs
->ws
.value
.sig
;
1388 target_terminal_ours (); /* Must do this before mourn anyway */
1390 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1391 reach here unless the inferior is dead. However, for years
1392 target_kill() was called here, which hints that fatal signals aren't
1393 really fatal on some systems. If that's true, then some changes
1395 target_mourn_inferior ();
1397 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1398 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1399 stop_stepping (ecs
);
1402 /* The following are the only cases in which we keep going;
1403 the above cases end in a continue or goto. */
1404 case TARGET_WAITKIND_FORKED
:
1405 case TARGET_WAITKIND_VFORKED
:
1407 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
1408 stop_signal
= TARGET_SIGNAL_TRAP
;
1409 pending_follow
.kind
= ecs
->ws
.kind
;
1411 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1412 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1414 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1416 context_switch (ecs
);
1417 flush_cached_frames ();
1420 stop_pc
= read_pc ();
1422 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1424 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1426 /* If no catchpoint triggered for this, then keep going. */
1427 if (ecs
->random_signal
)
1429 stop_signal
= TARGET_SIGNAL_0
;
1433 goto process_event_stop_test
;
1435 case TARGET_WAITKIND_EXECD
:
1437 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
1438 stop_signal
= TARGET_SIGNAL_TRAP
;
1440 /* NOTE drow/2002-12-05: This code should be pushed down into the
1441 target_wait function. Until then following vfork on HP/UX 10.20
1442 is probably broken by this. Of course, it's broken anyway. */
1443 /* Is this a target which reports multiple exec events per actual
1444 call to exec()? (HP-UX using ptrace does, for example.) If so,
1445 ignore all but the last one. Just resume the exec'r, and wait
1446 for the next exec event. */
1447 if (inferior_ignoring_leading_exec_events
)
1449 inferior_ignoring_leading_exec_events
--;
1450 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1451 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1453 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1454 prepare_to_wait (ecs
);
1457 inferior_ignoring_leading_exec_events
=
1458 target_reported_exec_events_per_exec_call () - 1;
1460 pending_follow
.execd_pathname
=
1461 savestring (ecs
->ws
.value
.execd_pathname
,
1462 strlen (ecs
->ws
.value
.execd_pathname
));
1464 /* This causes the eventpoints and symbol table to be reset. Must
1465 do this now, before trying to determine whether to stop. */
1466 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1467 xfree (pending_follow
.execd_pathname
);
1469 stop_pc
= read_pc_pid (ecs
->ptid
);
1470 ecs
->saved_inferior_ptid
= inferior_ptid
;
1471 inferior_ptid
= ecs
->ptid
;
1473 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1475 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1476 inferior_ptid
= ecs
->saved_inferior_ptid
;
1478 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1480 context_switch (ecs
);
1481 flush_cached_frames ();
1484 /* If no catchpoint triggered for this, then keep going. */
1485 if (ecs
->random_signal
)
1487 stop_signal
= TARGET_SIGNAL_0
;
1491 goto process_event_stop_test
;
1493 /* Be careful not to try to gather much state about a thread
1494 that's in a syscall. It's frequently a losing proposition. */
1495 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1497 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1498 resume (0, TARGET_SIGNAL_0
);
1499 prepare_to_wait (ecs
);
1502 /* Before examining the threads further, step this thread to
1503 get it entirely out of the syscall. (We get notice of the
1504 event when the thread is just on the verge of exiting a
1505 syscall. Stepping one instruction seems to get it back
1507 case TARGET_WAITKIND_SYSCALL_RETURN
:
1509 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1510 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1511 prepare_to_wait (ecs
);
1514 case TARGET_WAITKIND_STOPPED
:
1516 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
1517 stop_signal
= ecs
->ws
.value
.sig
;
1520 /* We had an event in the inferior, but we are not interested
1521 in handling it at this level. The lower layers have already
1522 done what needs to be done, if anything.
1524 One of the possible circumstances for this is when the
1525 inferior produces output for the console. The inferior has
1526 not stopped, and we are ignoring the event. Another possible
1527 circumstance is any event which the lower level knows will be
1528 reported multiple times without an intervening resume. */
1529 case TARGET_WAITKIND_IGNORE
:
1531 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
1532 prepare_to_wait (ecs
);
1536 /* We may want to consider not doing a resume here in order to give
1537 the user a chance to play with the new thread. It might be good
1538 to make that a user-settable option. */
1540 /* At this point, all threads are stopped (happens automatically in
1541 either the OS or the native code). Therefore we need to continue
1542 all threads in order to make progress. */
1543 if (ecs
->new_thread_event
)
1545 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1546 prepare_to_wait (ecs
);
1550 stop_pc
= read_pc_pid (ecs
->ptid
);
1553 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc
));
1555 if (stepping_past_singlestep_breakpoint
)
1557 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1558 && singlestep_breakpoints_inserted_p
);
1559 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1560 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1562 stepping_past_singlestep_breakpoint
= 0;
1564 /* We've either finished single-stepping past the single-step
1565 breakpoint, or stopped for some other reason. It would be nice if
1566 we could tell, but we can't reliably. */
1567 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1570 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
1571 /* Pull the single step breakpoints out of the target. */
1572 SOFTWARE_SINGLE_STEP (0, 0);
1573 singlestep_breakpoints_inserted_p
= 0;
1575 ecs
->random_signal
= 0;
1577 ecs
->ptid
= saved_singlestep_ptid
;
1578 context_switch (ecs
);
1579 if (deprecated_context_hook
)
1580 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1582 resume (1, TARGET_SIGNAL_0
);
1583 prepare_to_wait (ecs
);
1588 stepping_past_singlestep_breakpoint
= 0;
1590 /* See if a thread hit a thread-specific breakpoint that was meant for
1591 another thread. If so, then step that thread past the breakpoint,
1594 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1596 int thread_hop_needed
= 0;
1598 /* Check if a regular breakpoint has been hit before checking
1599 for a potential single step breakpoint. Otherwise, GDB will
1600 not see this breakpoint hit when stepping onto breakpoints. */
1601 if (breakpoints_inserted
&& breakpoint_here_p (stop_pc
))
1603 ecs
->random_signal
= 0;
1604 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1605 thread_hop_needed
= 1;
1607 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1609 ecs
->random_signal
= 0;
1610 /* The call to in_thread_list is necessary because PTIDs sometimes
1611 change when we go from single-threaded to multi-threaded. If
1612 the singlestep_ptid is still in the list, assume that it is
1613 really different from ecs->ptid. */
1614 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1615 && in_thread_list (singlestep_ptid
))
1617 thread_hop_needed
= 1;
1618 stepping_past_singlestep_breakpoint
= 1;
1619 saved_singlestep_ptid
= singlestep_ptid
;
1623 if (thread_hop_needed
)
1628 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
1630 /* Saw a breakpoint, but it was hit by the wrong thread.
1633 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1635 /* Pull the single step breakpoints out of the target. */
1636 SOFTWARE_SINGLE_STEP (0, 0);
1637 singlestep_breakpoints_inserted_p
= 0;
1640 remove_status
= remove_breakpoints ();
1641 /* Did we fail to remove breakpoints? If so, try
1642 to set the PC past the bp. (There's at least
1643 one situation in which we can fail to remove
1644 the bp's: On HP-UX's that use ttrace, we can't
1645 change the address space of a vforking child
1646 process until the child exits (well, okay, not
1647 then either :-) or execs. */
1648 if (remove_status
!= 0)
1650 /* FIXME! This is obviously non-portable! */
1651 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1652 /* We need to restart all the threads now,
1653 * unles we're running in scheduler-locked mode.
1654 * Use currently_stepping to determine whether to
1657 /* FIXME MVS: is there any reason not to call resume()? */
1658 if (scheduler_mode
== schedlock_on
)
1659 target_resume (ecs
->ptid
,
1660 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1662 target_resume (RESUME_ALL
,
1663 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1664 prepare_to_wait (ecs
);
1669 breakpoints_inserted
= 0;
1670 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1671 context_switch (ecs
);
1672 ecs
->waiton_ptid
= ecs
->ptid
;
1673 ecs
->wp
= &(ecs
->ws
);
1674 ecs
->another_trap
= 1;
1676 ecs
->infwait_state
= infwait_thread_hop_state
;
1678 registers_changed ();
1682 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1684 sw_single_step_trap_p
= 1;
1685 ecs
->random_signal
= 0;
1689 ecs
->random_signal
= 1;
1691 /* See if something interesting happened to the non-current thread. If
1692 so, then switch to that thread. */
1693 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1696 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
1698 context_switch (ecs
);
1700 if (deprecated_context_hook
)
1701 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1703 flush_cached_frames ();
1706 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1708 /* Pull the single step breakpoints out of the target. */
1709 SOFTWARE_SINGLE_STEP (0, 0);
1710 singlestep_breakpoints_inserted_p
= 0;
1713 /* It may not be necessary to disable the watchpoint to stop over
1714 it. For example, the PA can (with some kernel cooperation)
1715 single step over a watchpoint without disabling the watchpoint. */
1716 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1719 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1721 prepare_to_wait (ecs
);
1725 /* It is far more common to need to disable a watchpoint to step
1726 the inferior over it. FIXME. What else might a debug
1727 register or page protection watchpoint scheme need here? */
1728 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1730 /* At this point, we are stopped at an instruction which has
1731 attempted to write to a piece of memory under control of
1732 a watchpoint. The instruction hasn't actually executed
1733 yet. If we were to evaluate the watchpoint expression
1734 now, we would get the old value, and therefore no change
1735 would seem to have occurred.
1737 In order to make watchpoints work `right', we really need
1738 to complete the memory write, and then evaluate the
1739 watchpoint expression. The following code does that by
1740 removing the watchpoint (actually, all watchpoints and
1741 breakpoints), single-stepping the target, re-inserting
1742 watchpoints, and then falling through to let normal
1743 single-step processing handle proceed. Since this
1744 includes evaluating watchpoints, things will come to a
1745 stop in the correct manner. */
1748 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1749 remove_breakpoints ();
1750 registers_changed ();
1751 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1753 ecs
->waiton_ptid
= ecs
->ptid
;
1754 ecs
->wp
= &(ecs
->ws
);
1755 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1756 prepare_to_wait (ecs
);
1760 /* It may be possible to simply continue after a watchpoint. */
1761 if (HAVE_CONTINUABLE_WATCHPOINT
)
1762 stopped_by_watchpoint
= STOPPED_BY_WATCHPOINT (ecs
->ws
);
1764 ecs
->stop_func_start
= 0;
1765 ecs
->stop_func_end
= 0;
1766 ecs
->stop_func_name
= 0;
1767 /* Don't care about return value; stop_func_start and stop_func_name
1768 will both be 0 if it doesn't work. */
1769 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1770 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1771 ecs
->stop_func_start
+= DEPRECATED_FUNCTION_START_OFFSET
;
1772 ecs
->another_trap
= 0;
1773 bpstat_clear (&stop_bpstat
);
1775 stop_stack_dummy
= 0;
1776 stop_print_frame
= 1;
1777 ecs
->random_signal
= 0;
1778 stopped_by_random_signal
= 0;
1779 breakpoints_failed
= 0;
1781 if (stop_signal
== TARGET_SIGNAL_TRAP
1783 && gdbarch_single_step_through_delay_p (current_gdbarch
)
1784 && currently_stepping (ecs
))
1786 /* We're trying to step of a breakpoint. Turns out that we're
1787 also on an instruction that needs to be stepped multiple
1788 times before it's been fully executing. E.g., architectures
1789 with a delay slot. It needs to be stepped twice, once for
1790 the instruction and once for the delay slot. */
1791 int step_through_delay
1792 = gdbarch_single_step_through_delay (current_gdbarch
,
1793 get_current_frame ());
1794 if (debug_infrun
&& step_through_delay
)
1795 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
1796 if (step_range_end
== 0 && step_through_delay
)
1798 /* The user issued a continue when stopped at a breakpoint.
1799 Set up for another trap and get out of here. */
1800 ecs
->another_trap
= 1;
1804 else if (step_through_delay
)
1806 /* The user issued a step when stopped at a breakpoint.
1807 Maybe we should stop, maybe we should not - the delay
1808 slot *might* correspond to a line of source. In any
1809 case, don't decide that here, just set ecs->another_trap,
1810 making sure we single-step again before breakpoints are
1812 ecs
->another_trap
= 1;
1816 /* Look at the cause of the stop, and decide what to do.
1817 The alternatives are:
1818 1) break; to really stop and return to the debugger,
1819 2) drop through to start up again
1820 (set ecs->another_trap to 1 to single step once)
1821 3) set ecs->random_signal to 1, and the decision between 1 and 2
1822 will be made according to the signal handling tables. */
1824 /* First, distinguish signals caused by the debugger from signals
1825 that have to do with the program's own actions. Note that
1826 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1827 on the operating system version. Here we detect when a SIGILL or
1828 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1829 something similar for SIGSEGV, since a SIGSEGV will be generated
1830 when we're trying to execute a breakpoint instruction on a
1831 non-executable stack. This happens for call dummy breakpoints
1832 for architectures like SPARC that place call dummies on the
1835 if (stop_signal
== TARGET_SIGNAL_TRAP
1836 || (breakpoints_inserted
1837 && (stop_signal
== TARGET_SIGNAL_ILL
1838 || stop_signal
== TARGET_SIGNAL_SEGV
1839 || stop_signal
== TARGET_SIGNAL_EMT
))
1840 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1842 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1845 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
1846 stop_print_frame
= 0;
1847 stop_stepping (ecs
);
1851 /* This is originated from start_remote(), start_inferior() and
1852 shared libraries hook functions. */
1853 if (stop_soon
== STOP_QUIETLY
)
1856 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
1857 stop_stepping (ecs
);
1861 /* This originates from attach_command(). We need to overwrite
1862 the stop_signal here, because some kernels don't ignore a
1863 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1864 See more comments in inferior.h. */
1865 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1867 stop_stepping (ecs
);
1868 if (stop_signal
== TARGET_SIGNAL_STOP
)
1869 stop_signal
= TARGET_SIGNAL_0
;
1873 /* Don't even think about breakpoints if just proceeded over a
1875 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
)
1878 fprintf_unfiltered (gdb_stdlog
, "infrun: trap expected\n");
1879 bpstat_clear (&stop_bpstat
);
1883 /* See if there is a breakpoint at the current PC. */
1884 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
,
1885 stopped_by_watchpoint
);
1887 /* Following in case break condition called a
1889 stop_print_frame
= 1;
1892 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1893 at one stage in the past included checks for an inferior
1894 function call's call dummy's return breakpoint. The original
1895 comment, that went with the test, read:
1897 ``End of a stack dummy. Some systems (e.g. Sony news) give
1898 another signal besides SIGTRAP, so check here as well as
1901 If someone ever tries to get get call dummys on a
1902 non-executable stack to work (where the target would stop
1903 with something like a SIGSEGV), then those tests might need
1904 to be re-instated. Given, however, that the tests were only
1905 enabled when momentary breakpoints were not being used, I
1906 suspect that it won't be the case.
1908 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1909 be necessary for call dummies on a non-executable stack on
1912 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1914 = !(bpstat_explains_signal (stop_bpstat
)
1916 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1919 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1920 if (!ecs
->random_signal
)
1921 stop_signal
= TARGET_SIGNAL_TRAP
;
1925 /* When we reach this point, we've pretty much decided
1926 that the reason for stopping must've been a random
1927 (unexpected) signal. */
1930 ecs
->random_signal
= 1;
1932 process_event_stop_test
:
1933 /* For the program's own signals, act according to
1934 the signal handling tables. */
1936 if (ecs
->random_signal
)
1938 /* Signal not for debugging purposes. */
1942 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
1944 stopped_by_random_signal
= 1;
1946 if (signal_print
[stop_signal
])
1949 target_terminal_ours_for_output ();
1950 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1952 if (signal_stop
[stop_signal
])
1954 stop_stepping (ecs
);
1957 /* If not going to stop, give terminal back
1958 if we took it away. */
1960 target_terminal_inferior ();
1962 /* Clear the signal if it should not be passed. */
1963 if (signal_program
[stop_signal
] == 0)
1964 stop_signal
= TARGET_SIGNAL_0
;
1966 if (prev_pc
== read_pc ()
1967 && !breakpoints_inserted
1968 && breakpoint_here_p (read_pc ())
1969 && step_resume_breakpoint
== NULL
)
1971 /* We were just starting a new sequence, attempting to
1972 single-step off of a breakpoint and expecting a SIGTRAP.
1973 Intead this signal arrives. This signal will take us out
1974 of the stepping range so GDB needs to remember to, when
1975 the signal handler returns, resume stepping off that
1977 /* To simplify things, "continue" is forced to use the same
1978 code paths as single-step - set a breakpoint at the
1979 signal return address and then, once hit, step off that
1981 insert_step_resume_breakpoint_at_frame (get_current_frame ());
1982 ecs
->step_after_step_resume_breakpoint
= 1;
1987 if (step_range_end
!= 0
1988 && stop_signal
!= TARGET_SIGNAL_0
1989 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
1990 && frame_id_eq (get_frame_id (get_current_frame ()),
1992 && step_resume_breakpoint
== NULL
)
1994 /* The inferior is about to take a signal that will take it
1995 out of the single step range. Set a breakpoint at the
1996 current PC (which is presumably where the signal handler
1997 will eventually return) and then allow the inferior to
2000 Note that this is only needed for a signal delivered
2001 while in the single-step range. Nested signals aren't a
2002 problem as they eventually all return. */
2003 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2008 /* Note: step_resume_breakpoint may be non-NULL. This occures
2009 when either there's a nested signal, or when there's a
2010 pending signal enabled just as the signal handler returns
2011 (leaving the inferior at the step-resume-breakpoint without
2012 actually executing it). Either way continue until the
2013 breakpoint is really hit. */
2018 /* Handle cases caused by hitting a breakpoint. */
2020 CORE_ADDR jmp_buf_pc
;
2021 struct bpstat_what what
;
2023 what
= bpstat_what (stop_bpstat
);
2025 if (what
.call_dummy
)
2027 stop_stack_dummy
= 1;
2030 switch (what
.main_action
)
2032 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2033 /* If we hit the breakpoint at longjmp, disable it for the
2034 duration of this command. Then, install a temporary
2035 breakpoint at the target of the jmp_buf. */
2037 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2038 disable_longjmp_breakpoint ();
2039 remove_breakpoints ();
2040 breakpoints_inserted
= 0;
2041 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
2047 /* Need to blow away step-resume breakpoint, as it
2048 interferes with us */
2049 if (step_resume_breakpoint
!= NULL
)
2051 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2054 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2055 ecs
->handling_longjmp
= 1; /* FIXME */
2059 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2060 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2062 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2063 remove_breakpoints ();
2064 breakpoints_inserted
= 0;
2065 disable_longjmp_breakpoint ();
2066 ecs
->handling_longjmp
= 0; /* FIXME */
2067 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2069 /* else fallthrough */
2071 case BPSTAT_WHAT_SINGLE
:
2073 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2074 if (breakpoints_inserted
)
2076 remove_breakpoints ();
2078 breakpoints_inserted
= 0;
2079 ecs
->another_trap
= 1;
2080 /* Still need to check other stuff, at least the case
2081 where we are stepping and step out of the right range. */
2084 case BPSTAT_WHAT_STOP_NOISY
:
2086 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2087 stop_print_frame
= 1;
2089 /* We are about to nuke the step_resume_breakpointt via the
2090 cleanup chain, so no need to worry about it here. */
2092 stop_stepping (ecs
);
2095 case BPSTAT_WHAT_STOP_SILENT
:
2097 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2098 stop_print_frame
= 0;
2100 /* We are about to nuke the step_resume_breakpoin via the
2101 cleanup chain, so no need to worry about it here. */
2103 stop_stepping (ecs
);
2106 case BPSTAT_WHAT_STEP_RESUME
:
2107 /* This proably demands a more elegant solution, but, yeah
2110 This function's use of the simple variable
2111 step_resume_breakpoint doesn't seem to accomodate
2112 simultaneously active step-resume bp's, although the
2113 breakpoint list certainly can.
2115 If we reach here and step_resume_breakpoint is already
2116 NULL, then apparently we have multiple active
2117 step-resume bp's. We'll just delete the breakpoint we
2118 stopped at, and carry on.
2120 Correction: what the code currently does is delete a
2121 step-resume bp, but it makes no effort to ensure that
2122 the one deleted is the one currently stopped at. MVS */
2125 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2127 if (step_resume_breakpoint
== NULL
)
2129 step_resume_breakpoint
=
2130 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2132 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2133 if (ecs
->step_after_step_resume_breakpoint
)
2135 /* Back when the step-resume breakpoint was inserted, we
2136 were trying to single-step off a breakpoint. Go back
2138 ecs
->step_after_step_resume_breakpoint
= 0;
2139 remove_breakpoints ();
2140 breakpoints_inserted
= 0;
2141 ecs
->another_trap
= 1;
2147 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2149 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_THROUGH_SIGTRAMP\n");
2150 /* If were waiting for a trap, hitting the step_resume_break
2151 doesn't count as getting it. */
2153 ecs
->another_trap
= 1;
2156 case BPSTAT_WHAT_CHECK_SHLIBS
:
2157 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2160 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2161 /* Remove breakpoints, we eventually want to step over the
2162 shlib event breakpoint, and SOLIB_ADD might adjust
2163 breakpoint addresses via breakpoint_re_set. */
2164 if (breakpoints_inserted
)
2165 remove_breakpoints ();
2166 breakpoints_inserted
= 0;
2168 /* Check for any newly added shared libraries if we're
2169 supposed to be adding them automatically. Switch
2170 terminal for any messages produced by
2171 breakpoint_re_set. */
2172 target_terminal_ours_for_output ();
2173 /* NOTE: cagney/2003-11-25: Make certain that the target
2174 stack's section table is kept up-to-date. Architectures,
2175 (e.g., PPC64), use the section table to perform
2176 operations such as address => section name and hence
2177 require the table to contain all sections (including
2178 those found in shared libraries). */
2179 /* NOTE: cagney/2003-11-25: Pass current_target and not
2180 exec_ops to SOLIB_ADD. This is because current GDB is
2181 only tooled to propagate section_table changes out from
2182 the "current_target" (see target_resize_to_sections), and
2183 not up from the exec stratum. This, of course, isn't
2184 right. "infrun.c" should only interact with the
2185 exec/process stratum, instead relying on the target stack
2186 to propagate relevant changes (stop, section table
2187 changed, ...) up to other layers. */
2189 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2191 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2193 target_terminal_inferior ();
2195 /* Try to reenable shared library breakpoints, additional
2196 code segments in shared libraries might be mapped in now. */
2197 re_enable_breakpoints_in_shlibs ();
2199 /* If requested, stop when the dynamic linker notifies
2200 gdb of events. This allows the user to get control
2201 and place breakpoints in initializer routines for
2202 dynamically loaded objects (among other things). */
2203 if (stop_on_solib_events
|| stop_stack_dummy
)
2205 stop_stepping (ecs
);
2209 /* If we stopped due to an explicit catchpoint, then the
2210 (see above) call to SOLIB_ADD pulled in any symbols
2211 from a newly-loaded library, if appropriate.
2213 We do want the inferior to stop, but not where it is
2214 now, which is in the dynamic linker callback. Rather,
2215 we would like it stop in the user's program, just after
2216 the call that caused this catchpoint to trigger. That
2217 gives the user a more useful vantage from which to
2218 examine their program's state. */
2219 else if (what
.main_action
2220 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2222 /* ??rehrauer: If I could figure out how to get the
2223 right return PC from here, we could just set a temp
2224 breakpoint and resume. I'm not sure we can without
2225 cracking open the dld's shared libraries and sniffing
2226 their unwind tables and text/data ranges, and that's
2227 not a terribly portable notion.
2229 Until that time, we must step the inferior out of the
2230 dld callback, and also out of the dld itself (and any
2231 code or stubs in libdld.sl, such as "shl_load" and
2232 friends) until we reach non-dld code. At that point,
2233 we can stop stepping. */
2234 bpstat_get_triggered_catchpoints (stop_bpstat
,
2236 stepping_through_solib_catchpoints
);
2237 ecs
->stepping_through_solib_after_catch
= 1;
2239 /* Be sure to lift all breakpoints, so the inferior does
2240 actually step past this point... */
2241 ecs
->another_trap
= 1;
2246 /* We want to step over this breakpoint, then keep going. */
2247 ecs
->another_trap
= 1;
2253 case BPSTAT_WHAT_LAST
:
2254 /* Not a real code, but listed here to shut up gcc -Wall. */
2256 case BPSTAT_WHAT_KEEP_CHECKING
:
2261 /* We come here if we hit a breakpoint but should not
2262 stop for it. Possibly we also were stepping
2263 and should stop for that. So fall through and
2264 test for stepping. But, if not stepping,
2267 /* Are we stepping to get the inferior out of the dynamic linker's
2268 hook (and possibly the dld itself) after catching a shlib
2270 if (ecs
->stepping_through_solib_after_catch
)
2272 #if defined(SOLIB_ADD)
2273 /* Have we reached our destination? If not, keep going. */
2274 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2277 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2278 ecs
->another_trap
= 1;
2284 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2285 /* Else, stop and report the catchpoint(s) whose triggering
2286 caused us to begin stepping. */
2287 ecs
->stepping_through_solib_after_catch
= 0;
2288 bpstat_clear (&stop_bpstat
);
2289 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2290 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2291 stop_print_frame
= 1;
2292 stop_stepping (ecs
);
2296 if (step_resume_breakpoint
)
2299 fprintf_unfiltered (gdb_stdlog
, "infrun: step-resume breakpoint\n");
2301 /* Having a step-resume breakpoint overrides anything
2302 else having to do with stepping commands until
2303 that breakpoint is reached. */
2308 if (step_range_end
== 0)
2311 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
2312 /* Likewise if we aren't even stepping. */
2317 /* If stepping through a line, keep going if still within it.
2319 Note that step_range_end is the address of the first instruction
2320 beyond the step range, and NOT the address of the last instruction
2322 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2325 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
2326 paddr_nz (step_range_start
),
2327 paddr_nz (step_range_end
));
2332 /* We stepped out of the stepping range. */
2334 /* If we are stepping at the source level and entered the runtime
2335 loader dynamic symbol resolution code, we keep on single stepping
2336 until we exit the run time loader code and reach the callee's
2338 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2339 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2340 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
)
2342 && in_solib_dynsym_resolve_code (stop_pc
)
2346 CORE_ADDR pc_after_resolver
=
2347 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2350 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
2352 if (pc_after_resolver
)
2354 /* Set up a step-resume breakpoint at the address
2355 indicated by SKIP_SOLIB_RESOLVER. */
2356 struct symtab_and_line sr_sal
;
2358 sr_sal
.pc
= pc_after_resolver
;
2360 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2367 if (step_range_end
!= 1
2368 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2369 || step_over_calls
== STEP_OVER_ALL
)
2370 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2373 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
2374 /* The inferior, while doing a "step" or "next", has ended up in
2375 a signal trampoline (either by a signal being delivered or by
2376 the signal handler returning). Just single-step until the
2377 inferior leaves the trampoline (either by calling the handler
2383 /* Check for subroutine calls. The check for the current frame
2384 equalling the step ID is not necessary - the check of the
2385 previous frame's ID is sufficient - but it is a common case and
2386 cheaper than checking the previous frame's ID.
2388 NOTE: frame_id_eq will never report two invalid frame IDs as
2389 being equal, so to get into this block, both the current and
2390 previous frame must have valid frame IDs. */
2391 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
)
2392 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2394 CORE_ADDR real_stop_pc
;
2397 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
2399 if ((step_over_calls
== STEP_OVER_NONE
)
2400 || ((step_range_end
== 1)
2401 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2403 /* I presume that step_over_calls is only 0 when we're
2404 supposed to be stepping at the assembly language level
2405 ("stepi"). Just stop. */
2406 /* Also, maybe we just did a "nexti" inside a prolog, so we
2407 thought it was a subroutine call but it was not. Stop as
2410 print_stop_reason (END_STEPPING_RANGE
, 0);
2411 stop_stepping (ecs
);
2415 if (step_over_calls
== STEP_OVER_ALL
)
2417 /* We're doing a "next", set a breakpoint at callee's return
2418 address (the address at which the caller will
2420 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2425 /* If we are in a function call trampoline (a stub between the
2426 calling routine and the real function), locate the real
2427 function. That's what tells us (a) whether we want to step
2428 into it at all, and (b) what prologue we want to run to the
2429 end of, if we do step into it. */
2430 real_stop_pc
= skip_language_trampoline (stop_pc
);
2431 if (real_stop_pc
== 0)
2432 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2433 if (real_stop_pc
!= 0)
2434 ecs
->stop_func_start
= real_stop_pc
;
2437 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2438 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
)
2440 in_solib_dynsym_resolve_code (ecs
->stop_func_start
)
2444 struct symtab_and_line sr_sal
;
2446 sr_sal
.pc
= ecs
->stop_func_start
;
2448 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2453 /* If we have line number information for the function we are
2454 thinking of stepping into, step into it.
2456 If there are several symtabs at that PC (e.g. with include
2457 files), just want to know whether *any* of them have line
2458 numbers. find_pc_line handles this. */
2460 struct symtab_and_line tmp_sal
;
2462 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2463 if (tmp_sal
.line
!= 0)
2465 step_into_function (ecs
);
2470 /* If we have no line number and the step-stop-if-no-debug is
2471 set, we stop the step so that the user has a chance to switch
2472 in assembly mode. */
2473 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2476 print_stop_reason (END_STEPPING_RANGE
, 0);
2477 stop_stepping (ecs
);
2481 /* Set a breakpoint at callee's return address (the address at
2482 which the caller will resume). */
2483 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2488 /* If we're in the return path from a shared library trampoline,
2489 we want to proceed through the trampoline when stepping. */
2490 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2492 /* Determine where this trampoline returns. */
2493 CORE_ADDR real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2496 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
2498 /* Only proceed through if we know where it's going. */
2501 /* And put the step-breakpoint there and go until there. */
2502 struct symtab_and_line sr_sal
;
2504 init_sal (&sr_sal
); /* initialize to zeroes */
2505 sr_sal
.pc
= real_stop_pc
;
2506 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2508 /* Do not specify what the fp should be when we stop since
2509 on some machines the prologue is where the new fp value
2511 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2513 /* Restart without fiddling with the step ranges or
2520 ecs
->sal
= find_pc_line (stop_pc
, 0);
2522 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2523 the trampoline processing logic, however, there are some trampolines
2524 that have no names, so we should do trampoline handling first. */
2525 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2526 && ecs
->stop_func_name
== NULL
2527 && ecs
->sal
.line
== 0)
2530 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
2532 /* The inferior just stepped into, or returned to, an
2533 undebuggable function (where there is no debugging information
2534 and no line number corresponding to the address where the
2535 inferior stopped). Since we want to skip this kind of code,
2536 we keep going until the inferior returns from this
2537 function - unless the user has asked us not to (via
2538 set step-mode) or we no longer know how to get back
2539 to the call site. */
2540 if (step_stop_if_no_debug
2541 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2543 /* If we have no line number and the step-stop-if-no-debug
2544 is set, we stop the step so that the user has a chance to
2545 switch in assembly mode. */
2547 print_stop_reason (END_STEPPING_RANGE
, 0);
2548 stop_stepping (ecs
);
2553 /* Set a breakpoint at callee's return address (the address
2554 at which the caller will resume). */
2555 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2561 if (step_range_end
== 1)
2563 /* It is stepi or nexti. We always want to stop stepping after
2566 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
2568 print_stop_reason (END_STEPPING_RANGE
, 0);
2569 stop_stepping (ecs
);
2573 if (ecs
->sal
.line
== 0)
2575 /* We have no line number information. That means to stop
2576 stepping (does this always happen right after one instruction,
2577 when we do "s" in a function with no line numbers,
2578 or can this happen as a result of a return or longjmp?). */
2580 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
2582 print_stop_reason (END_STEPPING_RANGE
, 0);
2583 stop_stepping (ecs
);
2587 if ((stop_pc
== ecs
->sal
.pc
)
2588 && (ecs
->current_line
!= ecs
->sal
.line
2589 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2591 /* We are at the start of a different line. So stop. Note that
2592 we don't stop if we step into the middle of a different line.
2593 That is said to make things like for (;;) statements work
2596 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
2598 print_stop_reason (END_STEPPING_RANGE
, 0);
2599 stop_stepping (ecs
);
2603 /* We aren't done stepping.
2605 Optimize by setting the stepping range to the line.
2606 (We might not be in the original line, but if we entered a
2607 new line in mid-statement, we continue stepping. This makes
2608 things like for(;;) statements work better.) */
2610 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2612 /* If this is the last line of the function, don't keep stepping
2613 (it would probably step us out of the function).
2614 This is particularly necessary for a one-line function,
2615 in which after skipping the prologue we better stop even though
2616 we will be in mid-line. */
2618 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different function\n");
2620 print_stop_reason (END_STEPPING_RANGE
, 0);
2621 stop_stepping (ecs
);
2624 step_range_start
= ecs
->sal
.pc
;
2625 step_range_end
= ecs
->sal
.end
;
2626 step_frame_id
= get_frame_id (get_current_frame ());
2627 ecs
->current_line
= ecs
->sal
.line
;
2628 ecs
->current_symtab
= ecs
->sal
.symtab
;
2630 /* In the case where we just stepped out of a function into the
2631 middle of a line of the caller, continue stepping, but
2632 step_frame_id must be modified to current frame */
2634 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2635 generous. It will trigger on things like a step into a frameless
2636 stackless leaf function. I think the logic should instead look
2637 at the unwound frame ID has that should give a more robust
2638 indication of what happened. */
2639 if (step
- ID
== current
- ID
)
2640 still stepping in same function
;
2641 else if (step
- ID
== unwind (current
- ID
))
2642 stepped into a function
;
2644 stepped out of a function
;
2645 /* Of course this assumes that the frame ID unwind code is robust
2646 and we're willing to introduce frame unwind logic into this
2647 function. Fortunately, those days are nearly upon us. */
2650 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2651 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2652 step_frame_id
= current_frame
;
2656 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
2660 /* Are we in the middle of stepping? */
2663 currently_stepping (struct execution_control_state
*ecs
)
2665 return ((!ecs
->handling_longjmp
2666 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2668 || ecs
->stepping_through_solib_after_catch
2669 || bpstat_should_step ());
2672 /* Subroutine call with source code we should not step over. Do step
2673 to the first line of code in it. */
2676 step_into_function (struct execution_control_state
*ecs
)
2679 struct symtab_and_line sr_sal
;
2681 s
= find_pc_symtab (stop_pc
);
2682 if (s
&& s
->language
!= language_asm
)
2683 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2685 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2686 /* Use the step_resume_break to step until the end of the prologue,
2687 even if that involves jumps (as it seems to on the vax under
2689 /* If the prologue ends in the middle of a source line, continue to
2690 the end of that source line (if it is still within the function).
2691 Otherwise, just go to end of prologue. */
2693 && ecs
->sal
.pc
!= ecs
->stop_func_start
2694 && ecs
->sal
.end
< ecs
->stop_func_end
)
2695 ecs
->stop_func_start
= ecs
->sal
.end
;
2697 /* Architectures which require breakpoint adjustment might not be able
2698 to place a breakpoint at the computed address. If so, the test
2699 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2700 ecs->stop_func_start to an address at which a breakpoint may be
2701 legitimately placed.
2703 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2704 made, GDB will enter an infinite loop when stepping through
2705 optimized code consisting of VLIW instructions which contain
2706 subinstructions corresponding to different source lines. On
2707 FR-V, it's not permitted to place a breakpoint on any but the
2708 first subinstruction of a VLIW instruction. When a breakpoint is
2709 set, GDB will adjust the breakpoint address to the beginning of
2710 the VLIW instruction. Thus, we need to make the corresponding
2711 adjustment here when computing the stop address. */
2713 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2715 ecs
->stop_func_start
2716 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2717 ecs
->stop_func_start
);
2720 if (ecs
->stop_func_start
== stop_pc
)
2722 /* We are already there: stop now. */
2724 print_stop_reason (END_STEPPING_RANGE
, 0);
2725 stop_stepping (ecs
);
2730 /* Put the step-breakpoint there and go until there. */
2731 init_sal (&sr_sal
); /* initialize to zeroes */
2732 sr_sal
.pc
= ecs
->stop_func_start
;
2733 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2735 /* Do not specify what the fp should be when we stop since on
2736 some machines the prologue is where the new fp value is
2738 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2740 /* And make sure stepping stops right away then. */
2741 step_range_end
= step_range_start
;
2746 /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID.
2747 This is used to both functions and to skip over code. */
2750 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
2751 struct frame_id sr_id
)
2753 /* There should never be more than one step-resume breakpoint per
2754 thread, so we should never be setting a new
2755 step_resume_breakpoint when one is already active. */
2756 gdb_assert (step_resume_breakpoint
== NULL
);
2757 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
2759 if (breakpoints_inserted
)
2760 insert_breakpoints ();
2763 /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used
2764 to skip a potential signal handler.
2766 This is called with the interrupted function's frame. The signal
2767 handler, when it returns, will resume the interrupted function at
2771 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
2773 struct symtab_and_line sr_sal
;
2775 init_sal (&sr_sal
); /* initialize to zeros */
2777 sr_sal
.pc
= ADDR_BITS_REMOVE (get_frame_pc (return_frame
));
2778 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2780 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
2783 /* Similar to insert_step_resume_breakpoint_at_frame, except
2784 but a breakpoint at the previous frame's PC. This is used to
2785 skip a function after stepping into it (for "next" or if the called
2786 function has no debugging information).
2788 The current function has almost always been reached by single
2789 stepping a call or return instruction. NEXT_FRAME belongs to the
2790 current function, and the breakpoint will be set at the caller's
2793 This is a separate function rather than reusing
2794 insert_step_resume_breakpoint_at_frame in order to avoid
2795 get_prev_frame, which may stop prematurely (see the implementation
2796 of frame_unwind_id for an example). */
2799 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
2801 struct symtab_and_line sr_sal
;
2803 /* We shouldn't have gotten here if we don't know where the call site
2805 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
2807 init_sal (&sr_sal
); /* initialize to zeros */
2809 sr_sal
.pc
= ADDR_BITS_REMOVE (frame_pc_unwind (next_frame
));
2810 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2812 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
2816 stop_stepping (struct execution_control_state
*ecs
)
2819 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
2821 /* Let callers know we don't want to wait for the inferior anymore. */
2822 ecs
->wait_some_more
= 0;
2825 /* This function handles various cases where we need to continue
2826 waiting for the inferior. */
2827 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2830 keep_going (struct execution_control_state
*ecs
)
2832 /* Save the pc before execution, to compare with pc after stop. */
2833 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2835 /* If we did not do break;, it means we should keep running the
2836 inferior and not return to debugger. */
2838 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2840 /* We took a signal (which we are supposed to pass through to
2841 the inferior, else we'd have done a break above) and we
2842 haven't yet gotten our trap. Simply continue. */
2843 resume (currently_stepping (ecs
), stop_signal
);
2847 /* Either the trap was not expected, but we are continuing
2848 anyway (the user asked that this signal be passed to the
2851 The signal was SIGTRAP, e.g. it was our signal, but we
2852 decided we should resume from it.
2854 We're going to run this baby now! */
2856 if (!breakpoints_inserted
&& !ecs
->another_trap
)
2858 breakpoints_failed
= insert_breakpoints ();
2859 if (breakpoints_failed
)
2861 stop_stepping (ecs
);
2864 breakpoints_inserted
= 1;
2867 trap_expected
= ecs
->another_trap
;
2869 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2870 specifies that such a signal should be delivered to the
2873 Typically, this would occure when a user is debugging a
2874 target monitor on a simulator: the target monitor sets a
2875 breakpoint; the simulator encounters this break-point and
2876 halts the simulation handing control to GDB; GDB, noteing
2877 that the break-point isn't valid, returns control back to the
2878 simulator; the simulator then delivers the hardware
2879 equivalent of a SIGNAL_TRAP to the program being debugged. */
2881 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2882 stop_signal
= TARGET_SIGNAL_0
;
2885 resume (currently_stepping (ecs
), stop_signal
);
2888 prepare_to_wait (ecs
);
2891 /* This function normally comes after a resume, before
2892 handle_inferior_event exits. It takes care of any last bits of
2893 housekeeping, and sets the all-important wait_some_more flag. */
2896 prepare_to_wait (struct execution_control_state
*ecs
)
2899 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
2900 if (ecs
->infwait_state
== infwait_normal_state
)
2902 overlay_cache_invalid
= 1;
2904 /* We have to invalidate the registers BEFORE calling
2905 target_wait because they can be loaded from the target while
2906 in target_wait. This makes remote debugging a bit more
2907 efficient for those targets that provide critical registers
2908 as part of their normal status mechanism. */
2910 registers_changed ();
2911 ecs
->waiton_ptid
= pid_to_ptid (-1);
2912 ecs
->wp
= &(ecs
->ws
);
2914 /* This is the old end of the while loop. Let everybody know we
2915 want to wait for the inferior some more and get called again
2917 ecs
->wait_some_more
= 1;
2920 /* Print why the inferior has stopped. We always print something when
2921 the inferior exits, or receives a signal. The rest of the cases are
2922 dealt with later on in normal_stop() and print_it_typical(). Ideally
2923 there should be a call to this function from handle_inferior_event()
2924 each time stop_stepping() is called.*/
2926 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2928 switch (stop_reason
)
2931 /* We don't deal with these cases from handle_inferior_event()
2934 case END_STEPPING_RANGE
:
2935 /* We are done with a step/next/si/ni command. */
2936 /* For now print nothing. */
2937 /* Print a message only if not in the middle of doing a "step n"
2938 operation for n > 1 */
2939 if (!step_multi
|| !stop_step
)
2940 if (ui_out_is_mi_like_p (uiout
))
2943 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
2945 case BREAKPOINT_HIT
:
2946 /* We found a breakpoint. */
2947 /* For now print nothing. */
2950 /* The inferior was terminated by a signal. */
2951 annotate_signalled ();
2952 if (ui_out_is_mi_like_p (uiout
))
2955 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
2956 ui_out_text (uiout
, "\nProgram terminated with signal ");
2957 annotate_signal_name ();
2958 ui_out_field_string (uiout
, "signal-name",
2959 target_signal_to_name (stop_info
));
2960 annotate_signal_name_end ();
2961 ui_out_text (uiout
, ", ");
2962 annotate_signal_string ();
2963 ui_out_field_string (uiout
, "signal-meaning",
2964 target_signal_to_string (stop_info
));
2965 annotate_signal_string_end ();
2966 ui_out_text (uiout
, ".\n");
2967 ui_out_text (uiout
, "The program no longer exists.\n");
2970 /* The inferior program is finished. */
2971 annotate_exited (stop_info
);
2974 if (ui_out_is_mi_like_p (uiout
))
2975 ui_out_field_string (uiout
, "reason",
2976 async_reason_lookup (EXEC_ASYNC_EXITED
));
2977 ui_out_text (uiout
, "\nProgram exited with code ");
2978 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2979 (unsigned int) stop_info
);
2980 ui_out_text (uiout
, ".\n");
2984 if (ui_out_is_mi_like_p (uiout
))
2987 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
2988 ui_out_text (uiout
, "\nProgram exited normally.\n");
2990 /* Support the --return-child-result option. */
2991 return_child_result_value
= stop_info
;
2993 case SIGNAL_RECEIVED
:
2994 /* Signal received. The signal table tells us to print about
2997 ui_out_text (uiout
, "\nProgram received signal ");
2998 annotate_signal_name ();
2999 if (ui_out_is_mi_like_p (uiout
))
3001 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3002 ui_out_field_string (uiout
, "signal-name",
3003 target_signal_to_name (stop_info
));
3004 annotate_signal_name_end ();
3005 ui_out_text (uiout
, ", ");
3006 annotate_signal_string ();
3007 ui_out_field_string (uiout
, "signal-meaning",
3008 target_signal_to_string (stop_info
));
3009 annotate_signal_string_end ();
3010 ui_out_text (uiout
, ".\n");
3013 internal_error (__FILE__
, __LINE__
,
3014 _("print_stop_reason: unrecognized enum value"));
3020 /* Here to return control to GDB when the inferior stops for real.
3021 Print appropriate messages, remove breakpoints, give terminal our modes.
3023 STOP_PRINT_FRAME nonzero means print the executing frame
3024 (pc, function, args, file, line number and line text).
3025 BREAKPOINTS_FAILED nonzero means stop was due to error
3026 attempting to insert breakpoints. */
3031 struct target_waitstatus last
;
3034 get_last_target_status (&last_ptid
, &last
);
3036 /* As with the notification of thread events, we want to delay
3037 notifying the user that we've switched thread context until
3038 the inferior actually stops.
3040 There's no point in saying anything if the inferior has exited.
3041 Note that SIGNALLED here means "exited with a signal", not
3042 "received a signal". */
3043 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3044 && target_has_execution
3045 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3046 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3048 target_terminal_ours_for_output ();
3049 printf_filtered (_("[Switching to %s]\n"),
3050 target_pid_or_tid_to_str (inferior_ptid
));
3051 previous_inferior_ptid
= inferior_ptid
;
3054 /* NOTE drow/2004-01-17: Is this still necessary? */
3055 /* Make sure that the current_frame's pc is correct. This
3056 is a correction for setting up the frame info before doing
3057 DECR_PC_AFTER_BREAK */
3058 if (target_has_execution
)
3059 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3060 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3061 frame code to check for this and sort out any resultant mess.
3062 DECR_PC_AFTER_BREAK needs to just go away. */
3063 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3065 if (target_has_execution
&& breakpoints_inserted
)
3067 if (remove_breakpoints ())
3069 target_terminal_ours_for_output ();
3070 printf_filtered (_("\
3071 Cannot remove breakpoints because program is no longer writable.\n\
3072 It might be running in another process.\n\
3073 Further execution is probably impossible.\n"));
3076 breakpoints_inserted
= 0;
3078 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3079 Delete any breakpoint that is to be deleted at the next stop. */
3081 breakpoint_auto_delete (stop_bpstat
);
3083 /* If an auto-display called a function and that got a signal,
3084 delete that auto-display to avoid an infinite recursion. */
3086 if (stopped_by_random_signal
)
3087 disable_current_display ();
3089 /* Don't print a message if in the middle of doing a "step n"
3090 operation for n > 1 */
3091 if (step_multi
&& stop_step
)
3094 target_terminal_ours ();
3096 /* Set the current source location. This will also happen if we
3097 display the frame below, but the current SAL will be incorrect
3098 during a user hook-stop function. */
3099 if (target_has_stack
&& !stop_stack_dummy
)
3100 set_current_sal_from_frame (get_current_frame (), 1);
3102 /* Look up the hook_stop and run it (CLI internally handles problem
3103 of stop_command's pre-hook not existing). */
3105 catch_errors (hook_stop_stub
, stop_command
,
3106 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3108 if (!target_has_stack
)
3114 /* Select innermost stack frame - i.e., current frame is frame 0,
3115 and current location is based on that.
3116 Don't do this on return from a stack dummy routine,
3117 or if the program has exited. */
3119 if (!stop_stack_dummy
)
3121 select_frame (get_current_frame ());
3123 /* Print current location without a level number, if
3124 we have changed functions or hit a breakpoint.
3125 Print source line if we have one.
3126 bpstat_print() contains the logic deciding in detail
3127 what to print, based on the event(s) that just occurred. */
3129 if (stop_print_frame
&& deprecated_selected_frame
)
3133 int do_frame_printing
= 1;
3135 bpstat_ret
= bpstat_print (stop_bpstat
);
3139 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3140 (or should) carry around the function and does (or
3141 should) use that when doing a frame comparison. */
3143 && frame_id_eq (step_frame_id
,
3144 get_frame_id (get_current_frame ()))
3145 && step_start_function
== find_pc_function (stop_pc
))
3146 source_flag
= SRC_LINE
; /* finished step, just print source line */
3148 source_flag
= SRC_AND_LOC
; /* print location and source line */
3150 case PRINT_SRC_AND_LOC
:
3151 source_flag
= SRC_AND_LOC
; /* print location and source line */
3153 case PRINT_SRC_ONLY
:
3154 source_flag
= SRC_LINE
;
3157 source_flag
= SRC_LINE
; /* something bogus */
3158 do_frame_printing
= 0;
3161 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3163 /* For mi, have the same behavior every time we stop:
3164 print everything but the source line. */
3165 if (ui_out_is_mi_like_p (uiout
))
3166 source_flag
= LOC_AND_ADDRESS
;
3168 if (ui_out_is_mi_like_p (uiout
))
3169 ui_out_field_int (uiout
, "thread-id",
3170 pid_to_thread_id (inferior_ptid
));
3171 /* The behavior of this routine with respect to the source
3173 SRC_LINE: Print only source line
3174 LOCATION: Print only location
3175 SRC_AND_LOC: Print location and source line */
3176 if (do_frame_printing
)
3177 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3179 /* Display the auto-display expressions. */
3184 /* Save the function value return registers, if we care.
3185 We might be about to restore their previous contents. */
3186 if (proceed_to_finish
)
3187 /* NB: The copy goes through to the target picking up the value of
3188 all the registers. */
3189 regcache_cpy (stop_registers
, current_regcache
);
3191 if (stop_stack_dummy
)
3193 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3194 ends with a setting of the current frame, so we can use that
3196 frame_pop (get_current_frame ());
3197 /* Set stop_pc to what it was before we called the function.
3198 Can't rely on restore_inferior_status because that only gets
3199 called if we don't stop in the called function. */
3200 stop_pc
= read_pc ();
3201 select_frame (get_current_frame ());
3205 annotate_stopped ();
3206 observer_notify_normal_stop (stop_bpstat
);
3210 hook_stop_stub (void *cmd
)
3212 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3217 signal_stop_state (int signo
)
3219 return signal_stop
[signo
];
3223 signal_print_state (int signo
)
3225 return signal_print
[signo
];
3229 signal_pass_state (int signo
)
3231 return signal_program
[signo
];
3235 signal_stop_update (int signo
, int state
)
3237 int ret
= signal_stop
[signo
];
3238 signal_stop
[signo
] = state
;
3243 signal_print_update (int signo
, int state
)
3245 int ret
= signal_print
[signo
];
3246 signal_print
[signo
] = state
;
3251 signal_pass_update (int signo
, int state
)
3253 int ret
= signal_program
[signo
];
3254 signal_program
[signo
] = state
;
3259 sig_print_header (void)
3261 printf_filtered (_("\
3262 Signal Stop\tPrint\tPass to program\tDescription\n"));
3266 sig_print_info (enum target_signal oursig
)
3268 char *name
= target_signal_to_name (oursig
);
3269 int name_padding
= 13 - strlen (name
);
3271 if (name_padding
<= 0)
3274 printf_filtered ("%s", name
);
3275 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3276 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3277 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3278 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3279 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3282 /* Specify how various signals in the inferior should be handled. */
3285 handle_command (char *args
, int from_tty
)
3288 int digits
, wordlen
;
3289 int sigfirst
, signum
, siglast
;
3290 enum target_signal oursig
;
3293 unsigned char *sigs
;
3294 struct cleanup
*old_chain
;
3298 error_no_arg (_("signal to handle"));
3301 /* Allocate and zero an array of flags for which signals to handle. */
3303 nsigs
= (int) TARGET_SIGNAL_LAST
;
3304 sigs
= (unsigned char *) alloca (nsigs
);
3305 memset (sigs
, 0, nsigs
);
3307 /* Break the command line up into args. */
3309 argv
= buildargv (args
);
3314 old_chain
= make_cleanup_freeargv (argv
);
3316 /* Walk through the args, looking for signal oursigs, signal names, and
3317 actions. Signal numbers and signal names may be interspersed with
3318 actions, with the actions being performed for all signals cumulatively
3319 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3321 while (*argv
!= NULL
)
3323 wordlen
= strlen (*argv
);
3324 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3328 sigfirst
= siglast
= -1;
3330 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3332 /* Apply action to all signals except those used by the
3333 debugger. Silently skip those. */
3336 siglast
= nsigs
- 1;
3338 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3340 SET_SIGS (nsigs
, sigs
, signal_stop
);
3341 SET_SIGS (nsigs
, sigs
, signal_print
);
3343 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3345 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3347 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3349 SET_SIGS (nsigs
, sigs
, signal_print
);
3351 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3353 SET_SIGS (nsigs
, sigs
, signal_program
);
3355 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3357 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3359 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3361 SET_SIGS (nsigs
, sigs
, signal_program
);
3363 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3365 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3366 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3368 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3370 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3372 else if (digits
> 0)
3374 /* It is numeric. The numeric signal refers to our own
3375 internal signal numbering from target.h, not to host/target
3376 signal number. This is a feature; users really should be
3377 using symbolic names anyway, and the common ones like
3378 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3380 sigfirst
= siglast
= (int)
3381 target_signal_from_command (atoi (*argv
));
3382 if ((*argv
)[digits
] == '-')
3385 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3387 if (sigfirst
> siglast
)
3389 /* Bet he didn't figure we'd think of this case... */
3397 oursig
= target_signal_from_name (*argv
);
3398 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3400 sigfirst
= siglast
= (int) oursig
;
3404 /* Not a number and not a recognized flag word => complain. */
3405 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
3409 /* If any signal numbers or symbol names were found, set flags for
3410 which signals to apply actions to. */
3412 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3414 switch ((enum target_signal
) signum
)
3416 case TARGET_SIGNAL_TRAP
:
3417 case TARGET_SIGNAL_INT
:
3418 if (!allsigs
&& !sigs
[signum
])
3420 if (query ("%s is used by the debugger.\n\
3421 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3427 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3428 gdb_flush (gdb_stdout
);
3432 case TARGET_SIGNAL_0
:
3433 case TARGET_SIGNAL_DEFAULT
:
3434 case TARGET_SIGNAL_UNKNOWN
:
3435 /* Make sure that "all" doesn't print these. */
3446 target_notice_signals (inferior_ptid
);
3450 /* Show the results. */
3451 sig_print_header ();
3452 for (signum
= 0; signum
< nsigs
; signum
++)
3456 sig_print_info (signum
);
3461 do_cleanups (old_chain
);
3465 xdb_handle_command (char *args
, int from_tty
)
3468 struct cleanup
*old_chain
;
3470 /* Break the command line up into args. */
3472 argv
= buildargv (args
);
3477 old_chain
= make_cleanup_freeargv (argv
);
3478 if (argv
[1] != (char *) NULL
)
3483 bufLen
= strlen (argv
[0]) + 20;
3484 argBuf
= (char *) xmalloc (bufLen
);
3488 enum target_signal oursig
;
3490 oursig
= target_signal_from_name (argv
[0]);
3491 memset (argBuf
, 0, bufLen
);
3492 if (strcmp (argv
[1], "Q") == 0)
3493 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3496 if (strcmp (argv
[1], "s") == 0)
3498 if (!signal_stop
[oursig
])
3499 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3501 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3503 else if (strcmp (argv
[1], "i") == 0)
3505 if (!signal_program
[oursig
])
3506 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3508 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3510 else if (strcmp (argv
[1], "r") == 0)
3512 if (!signal_print
[oursig
])
3513 sprintf (argBuf
, "%s %s", argv
[0], "print");
3515 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3521 handle_command (argBuf
, from_tty
);
3523 printf_filtered (_("Invalid signal handling flag.\n"));
3528 do_cleanups (old_chain
);
3531 /* Print current contents of the tables set by the handle command.
3532 It is possible we should just be printing signals actually used
3533 by the current target (but for things to work right when switching
3534 targets, all signals should be in the signal tables). */
3537 signals_info (char *signum_exp
, int from_tty
)
3539 enum target_signal oursig
;
3540 sig_print_header ();
3544 /* First see if this is a symbol name. */
3545 oursig
= target_signal_from_name (signum_exp
);
3546 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3548 /* No, try numeric. */
3550 target_signal_from_command (parse_and_eval_long (signum_exp
));
3552 sig_print_info (oursig
);
3556 printf_filtered ("\n");
3557 /* These ugly casts brought to you by the native VAX compiler. */
3558 for (oursig
= TARGET_SIGNAL_FIRST
;
3559 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3560 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3564 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3565 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3566 sig_print_info (oursig
);
3569 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3572 struct inferior_status
3574 enum target_signal stop_signal
;
3578 int stop_stack_dummy
;
3579 int stopped_by_random_signal
;
3581 CORE_ADDR step_range_start
;
3582 CORE_ADDR step_range_end
;
3583 struct frame_id step_frame_id
;
3584 enum step_over_calls_kind step_over_calls
;
3585 CORE_ADDR step_resume_break_address
;
3586 int stop_after_trap
;
3588 struct regcache
*stop_registers
;
3590 /* These are here because if call_function_by_hand has written some
3591 registers and then decides to call error(), we better not have changed
3593 struct regcache
*registers
;
3595 /* A frame unique identifier. */
3596 struct frame_id selected_frame_id
;
3598 int breakpoint_proceeded
;
3599 int restore_stack_info
;
3600 int proceed_to_finish
;
3604 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3607 int size
= register_size (current_gdbarch
, regno
);
3608 void *buf
= alloca (size
);
3609 store_signed_integer (buf
, size
, val
);
3610 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3613 /* Save all of the information associated with the inferior<==>gdb
3614 connection. INF_STATUS is a pointer to a "struct inferior_status"
3615 (defined in inferior.h). */
3617 struct inferior_status
*
3618 save_inferior_status (int restore_stack_info
)
3620 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3622 inf_status
->stop_signal
= stop_signal
;
3623 inf_status
->stop_pc
= stop_pc
;
3624 inf_status
->stop_step
= stop_step
;
3625 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3626 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3627 inf_status
->trap_expected
= trap_expected
;
3628 inf_status
->step_range_start
= step_range_start
;
3629 inf_status
->step_range_end
= step_range_end
;
3630 inf_status
->step_frame_id
= step_frame_id
;
3631 inf_status
->step_over_calls
= step_over_calls
;
3632 inf_status
->stop_after_trap
= stop_after_trap
;
3633 inf_status
->stop_soon
= stop_soon
;
3634 /* Save original bpstat chain here; replace it with copy of chain.
3635 If caller's caller is walking the chain, they'll be happier if we
3636 hand them back the original chain when restore_inferior_status is
3638 inf_status
->stop_bpstat
= stop_bpstat
;
3639 stop_bpstat
= bpstat_copy (stop_bpstat
);
3640 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3641 inf_status
->restore_stack_info
= restore_stack_info
;
3642 inf_status
->proceed_to_finish
= proceed_to_finish
;
3644 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3646 inf_status
->registers
= regcache_dup (current_regcache
);
3648 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3653 restore_selected_frame (void *args
)
3655 struct frame_id
*fid
= (struct frame_id
*) args
;
3656 struct frame_info
*frame
;
3658 frame
= frame_find_by_id (*fid
);
3660 /* If inf_status->selected_frame_id is NULL, there was no previously
3664 warning (_("Unable to restore previously selected frame."));
3668 select_frame (frame
);
3674 restore_inferior_status (struct inferior_status
*inf_status
)
3676 stop_signal
= inf_status
->stop_signal
;
3677 stop_pc
= inf_status
->stop_pc
;
3678 stop_step
= inf_status
->stop_step
;
3679 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3680 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3681 trap_expected
= inf_status
->trap_expected
;
3682 step_range_start
= inf_status
->step_range_start
;
3683 step_range_end
= inf_status
->step_range_end
;
3684 step_frame_id
= inf_status
->step_frame_id
;
3685 step_over_calls
= inf_status
->step_over_calls
;
3686 stop_after_trap
= inf_status
->stop_after_trap
;
3687 stop_soon
= inf_status
->stop_soon
;
3688 bpstat_clear (&stop_bpstat
);
3689 stop_bpstat
= inf_status
->stop_bpstat
;
3690 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3691 proceed_to_finish
= inf_status
->proceed_to_finish
;
3693 /* FIXME: Is the restore of stop_registers always needed. */
3694 regcache_xfree (stop_registers
);
3695 stop_registers
= inf_status
->stop_registers
;
3697 /* The inferior can be gone if the user types "print exit(0)"
3698 (and perhaps other times). */
3699 if (target_has_execution
)
3700 /* NB: The register write goes through to the target. */
3701 regcache_cpy (current_regcache
, inf_status
->registers
);
3702 regcache_xfree (inf_status
->registers
);
3704 /* FIXME: If we are being called after stopping in a function which
3705 is called from gdb, we should not be trying to restore the
3706 selected frame; it just prints a spurious error message (The
3707 message is useful, however, in detecting bugs in gdb (like if gdb
3708 clobbers the stack)). In fact, should we be restoring the
3709 inferior status at all in that case? . */
3711 if (target_has_stack
&& inf_status
->restore_stack_info
)
3713 /* The point of catch_errors is that if the stack is clobbered,
3714 walking the stack might encounter a garbage pointer and
3715 error() trying to dereference it. */
3717 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3718 "Unable to restore previously selected frame:\n",
3719 RETURN_MASK_ERROR
) == 0)
3720 /* Error in restoring the selected frame. Select the innermost
3722 select_frame (get_current_frame ());
3730 do_restore_inferior_status_cleanup (void *sts
)
3732 restore_inferior_status (sts
);
3736 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3738 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3742 discard_inferior_status (struct inferior_status
*inf_status
)
3744 /* See save_inferior_status for info on stop_bpstat. */
3745 bpstat_clear (&inf_status
->stop_bpstat
);
3746 regcache_xfree (inf_status
->registers
);
3747 regcache_xfree (inf_status
->stop_registers
);
3752 inferior_has_forked (int pid
, int *child_pid
)
3754 struct target_waitstatus last
;
3757 get_last_target_status (&last_ptid
, &last
);
3759 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3762 if (ptid_get_pid (last_ptid
) != pid
)
3765 *child_pid
= last
.value
.related_pid
;
3770 inferior_has_vforked (int pid
, int *child_pid
)
3772 struct target_waitstatus last
;
3775 get_last_target_status (&last_ptid
, &last
);
3777 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3780 if (ptid_get_pid (last_ptid
) != pid
)
3783 *child_pid
= last
.value
.related_pid
;
3788 inferior_has_execd (int pid
, char **execd_pathname
)
3790 struct target_waitstatus last
;
3793 get_last_target_status (&last_ptid
, &last
);
3795 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3798 if (ptid_get_pid (last_ptid
) != pid
)
3801 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3805 /* Oft used ptids */
3807 ptid_t minus_one_ptid
;
3809 /* Create a ptid given the necessary PID, LWP, and TID components. */
3812 ptid_build (int pid
, long lwp
, long tid
)
3822 /* Create a ptid from just a pid. */
3825 pid_to_ptid (int pid
)
3827 return ptid_build (pid
, 0, 0);
3830 /* Fetch the pid (process id) component from a ptid. */
3833 ptid_get_pid (ptid_t ptid
)
3838 /* Fetch the lwp (lightweight process) component from a ptid. */
3841 ptid_get_lwp (ptid_t ptid
)
3846 /* Fetch the tid (thread id) component from a ptid. */
3849 ptid_get_tid (ptid_t ptid
)
3854 /* ptid_equal() is used to test equality of two ptids. */
3857 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3859 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3860 && ptid1
.tid
== ptid2
.tid
);
3863 /* restore_inferior_ptid() will be used by the cleanup machinery
3864 to restore the inferior_ptid value saved in a call to
3865 save_inferior_ptid(). */
3868 restore_inferior_ptid (void *arg
)
3870 ptid_t
*saved_ptid_ptr
= arg
;
3871 inferior_ptid
= *saved_ptid_ptr
;
3875 /* Save the value of inferior_ptid so that it may be restored by a
3876 later call to do_cleanups(). Returns the struct cleanup pointer
3877 needed for later doing the cleanup. */
3880 save_inferior_ptid (void)
3882 ptid_t
*saved_ptid_ptr
;
3884 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3885 *saved_ptid_ptr
= inferior_ptid
;
3886 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3893 stop_registers
= regcache_xmalloc (current_gdbarch
);
3897 _initialize_infrun (void)
3901 struct cmd_list_element
*c
;
3903 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers
);
3904 deprecated_register_gdbarch_swap (NULL
, 0, build_infrun
);
3906 add_info ("signals", signals_info
, _("\
3907 What debugger does when program gets various signals.\n\
3908 Specify a signal as argument to print info on that signal only."));
3909 add_info_alias ("handle", "signals", 0);
3911 add_com ("handle", class_run
, handle_command
, _("\
3912 Specify how to handle a signal.\n\
3913 Args are signals and actions to apply to those signals.\n\
3914 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3915 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3916 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3917 The special arg \"all\" is recognized to mean all signals except those\n\
3918 used by the debugger, typically SIGTRAP and SIGINT.\n\
3919 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3920 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3921 Stop means reenter debugger if this signal happens (implies print).\n\
3922 Print means print a message if this signal happens.\n\
3923 Pass means let program see this signal; otherwise program doesn't know.\n\
3924 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3925 Pass and Stop may be combined."));
3928 add_com ("lz", class_info
, signals_info
, _("\
3929 What debugger does when program gets various signals.\n\
3930 Specify a signal as argument to print info on that signal only."));
3931 add_com ("z", class_run
, xdb_handle_command
, _("\
3932 Specify how to handle a signal.\n\
3933 Args are signals and actions to apply to those signals.\n\
3934 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3935 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3936 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3937 The special arg \"all\" is recognized to mean all signals except those\n\
3938 used by the debugger, typically SIGTRAP and SIGINT.\n\
3939 Recognized actions include \"s\" (toggles between stop and nostop), \n\
3940 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3941 nopass), \"Q\" (noprint)\n\
3942 Stop means reenter debugger if this signal happens (implies print).\n\
3943 Print means print a message if this signal happens.\n\
3944 Pass means let program see this signal; otherwise program doesn't know.\n\
3945 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3946 Pass and Stop may be combined."));
3950 stop_command
= add_cmd ("stop", class_obscure
,
3951 not_just_help_class_command
, _("\
3952 There is no `stop' command, but you can set a hook on `stop'.\n\
3953 This allows you to set a list of commands to be run each time execution\n\
3954 of the program stops."), &cmdlist
);
3956 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
3957 Set inferior debugging."), _("\
3958 Show inferior debugging."), _("\
3959 When non-zero, inferior specific debugging is enabled."),
3962 &setdebuglist
, &showdebuglist
);
3964 numsigs
= (int) TARGET_SIGNAL_LAST
;
3965 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3966 signal_print
= (unsigned char *)
3967 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3968 signal_program
= (unsigned char *)
3969 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3970 for (i
= 0; i
< numsigs
; i
++)
3973 signal_print
[i
] = 1;
3974 signal_program
[i
] = 1;
3977 /* Signals caused by debugger's own actions
3978 should not be given to the program afterwards. */
3979 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3980 signal_program
[TARGET_SIGNAL_INT
] = 0;
3982 /* Signals that are not errors should not normally enter the debugger. */
3983 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3984 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3985 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3986 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3987 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3988 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3989 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3990 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3991 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3992 signal_print
[TARGET_SIGNAL_IO
] = 0;
3993 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3994 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3995 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3996 signal_print
[TARGET_SIGNAL_URG
] = 0;
3997 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
3998 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4000 /* These signals are used internally by user-level thread
4001 implementations. (See signal(5) on Solaris.) Like the above
4002 signals, a healthy program receives and handles them as part of
4003 its normal operation. */
4004 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4005 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4006 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4007 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4008 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4009 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4011 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
4012 &stop_on_solib_events
, _("\
4013 Set stopping for shared library events."), _("\
4014 Show stopping for shared library events."), _("\
4015 If nonzero, gdb will give control to the user when the dynamic linker\n\
4016 notifies gdb of shared library events. The most common event of interest\n\
4017 to the user would be loading/unloading of a new library."),
4019 show_stop_on_solib_events
,
4020 &setlist
, &showlist
);
4022 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
4023 follow_fork_mode_kind_names
,
4024 &follow_fork_mode_string
, _("\
4025 Set debugger response to a program call of fork or vfork."), _("\
4026 Show debugger response to a program call of fork or vfork."), _("\
4027 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4028 parent - the original process is debugged after a fork\n\
4029 child - the new process is debugged after a fork\n\
4030 The unfollowed process will continue to run.\n\
4031 By default, the debugger will follow the parent process."),
4033 show_follow_fork_mode_string
,
4034 &setlist
, &showlist
);
4036 add_setshow_enum_cmd ("scheduler-locking", class_run
,
4037 scheduler_enums
, &scheduler_mode
, _("\
4038 Set mode for locking scheduler during execution."), _("\
4039 Show mode for locking scheduler during execution."), _("\
4040 off == no locking (threads may preempt at any time)\n\
4041 on == full locking (no thread except the current thread may run)\n\
4042 step == scheduler locked during every single-step operation.\n\
4043 In this mode, no other thread may run during a step command.\n\
4044 Other threads may run while stepping over a function call ('next')."),
4045 set_schedlock_func
, /* traps on target vector */
4046 show_scheduler_mode
,
4047 &setlist
, &showlist
);
4049 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
4050 Set mode of the step operation."), _("\
4051 Show mode of the step operation."), _("\
4052 When set, doing a step over a function without debug line information\n\
4053 will stop at the first instruction of that function. Otherwise, the\n\
4054 function is skipped and the step command stops at a different source line."),
4056 show_step_stop_if_no_debug
,
4057 &setlist
, &showlist
);
4059 /* ptid initializations */
4060 null_ptid
= ptid_build (0, 0, 0);
4061 minus_one_ptid
= ptid_build (-1, 0, 0);
4062 inferior_ptid
= null_ptid
;
4063 target_last_wait_ptid
= minus_one_ptid
;