1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
6 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
26 #include "gdb_string.h"
31 #include "exceptions.h"
32 #include "breakpoint.h"
36 #include "cli/cli-script.h"
38 #include "gdbthread.h"
51 #include "gdb_assert.h"
52 #include "mi/mi-common.h"
54 /* Prototypes for local functions */
56 static void signals_info (char *, int);
58 static void handle_command (char *, int);
60 static void sig_print_info (enum target_signal
);
62 static void sig_print_header (void);
64 static void resume_cleanups (void *);
66 static int hook_stop_stub (void *);
68 static int restore_selected_frame (void *);
70 static void build_infrun (void);
72 static int follow_fork (void);
74 static void set_schedlock_func (char *args
, int from_tty
,
75 struct cmd_list_element
*c
);
77 struct execution_control_state
;
79 static int currently_stepping (struct execution_control_state
*ecs
);
81 static void xdb_handle_command (char *args
, int from_tty
);
83 static int prepare_to_proceed (void);
85 void _initialize_infrun (void);
87 int inferior_ignoring_startup_exec_events
= 0;
88 int inferior_ignoring_leading_exec_events
= 0;
90 /* When set, stop the 'step' command if we enter a function which has
91 no line number information. The normal behavior is that we step
92 over such function. */
93 int step_stop_if_no_debug
= 0;
95 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
96 struct cmd_list_element
*c
, const char *value
)
98 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
101 /* In asynchronous mode, but simulating synchronous execution. */
103 int sync_execution
= 0;
105 /* wait_for_inferior and normal_stop use this to notify the user
106 when the inferior stopped in a different thread than it had been
109 static ptid_t previous_inferior_ptid
;
111 /* This is true for configurations that may follow through execl() and
112 similar functions. At present this is only true for HP-UX native. */
114 #ifndef MAY_FOLLOW_EXEC
115 #define MAY_FOLLOW_EXEC (0)
118 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
120 static int debug_infrun
= 0;
122 show_debug_infrun (struct ui_file
*file
, int from_tty
,
123 struct cmd_list_element
*c
, const char *value
)
125 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
128 /* If the program uses ELF-style shared libraries, then calls to
129 functions in shared libraries go through stubs, which live in a
130 table called the PLT (Procedure Linkage Table). The first time the
131 function is called, the stub sends control to the dynamic linker,
132 which looks up the function's real address, patches the stub so
133 that future calls will go directly to the function, and then passes
134 control to the function.
136 If we are stepping at the source level, we don't want to see any of
137 this --- we just want to skip over the stub and the dynamic linker.
138 The simple approach is to single-step until control leaves the
141 However, on some systems (e.g., Red Hat's 5.2 distribution) the
142 dynamic linker calls functions in the shared C library, so you
143 can't tell from the PC alone whether the dynamic linker is still
144 running. In this case, we use a step-resume breakpoint to get us
145 past the dynamic linker, as if we were using "next" to step over a
148 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
149 linker code or not. Normally, this means we single-step. However,
150 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
151 address where we can place a step-resume breakpoint to get past the
152 linker's symbol resolution function.
154 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
155 pretty portable way, by comparing the PC against the address ranges
156 of the dynamic linker's sections.
158 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
159 it depends on internal details of the dynamic linker. It's usually
160 not too hard to figure out where to put a breakpoint, but it
161 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
162 sanity checking. If it can't figure things out, returning zero and
163 getting the (possibly confusing) stepping behavior is better than
164 signalling an error, which will obscure the change in the
167 /* This function returns TRUE if pc is the address of an instruction
168 that lies within the dynamic linker (such as the event hook, or the
171 This function must be used only when a dynamic linker event has
172 been caught, and the inferior is being stepped out of the hook, or
173 undefined results are guaranteed. */
175 #ifndef SOLIB_IN_DYNAMIC_LINKER
176 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
179 /* We can't step off a permanent breakpoint in the ordinary way, because we
180 can't remove it. Instead, we have to advance the PC to the next
181 instruction. This macro should expand to a pointer to a function that
182 does that, or zero if we have no such function. If we don't have a
183 definition for it, we have to report an error. */
184 #ifndef SKIP_PERMANENT_BREAKPOINT
185 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
187 default_skip_permanent_breakpoint (void)
190 The program is stopped at a permanent breakpoint, but GDB does not know\n\
191 how to step past a permanent breakpoint on this architecture. Try using\n\
192 a command like `return' or `jump' to continue execution."));
197 /* Convert the #defines into values. This is temporary until wfi control
198 flow is completely sorted out. */
200 #ifndef 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. */
835 start_remote (int from_tty
)
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 ();
858 /* Now that the inferior has stopped, do any bookkeeping like
859 loading shared libraries. We want to do this before normal_stop,
860 so that the displayed frame is up to date. */
861 post_create_inferior (¤t_target
, from_tty
);
866 /* Initialize static vars when a new inferior begins. */
869 init_wait_for_inferior (void)
871 /* These are meaningless until the first time through wait_for_inferior. */
874 breakpoints_inserted
= 0;
875 breakpoint_init_inferior (inf_starting
);
877 /* Don't confuse first call to proceed(). */
878 stop_signal
= TARGET_SIGNAL_0
;
880 /* The first resume is not following a fork/vfork/exec. */
881 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
883 clear_proceed_status ();
885 stepping_past_singlestep_breakpoint
= 0;
888 /* This enum encodes possible reasons for doing a target_wait, so that
889 wfi can call target_wait in one place. (Ultimately the call will be
890 moved out of the infinite loop entirely.) */
894 infwait_normal_state
,
895 infwait_thread_hop_state
,
896 infwait_nonstep_watch_state
899 /* Why did the inferior stop? Used to print the appropriate messages
900 to the interface from within handle_inferior_event(). */
901 enum inferior_stop_reason
903 /* We don't know why. */
905 /* Step, next, nexti, stepi finished. */
907 /* Found breakpoint. */
909 /* Inferior terminated by signal. */
911 /* Inferior exited. */
913 /* Inferior received signal, and user asked to be notified. */
917 /* This structure contains what used to be local variables in
918 wait_for_inferior. Probably many of them can return to being
919 locals in handle_inferior_event. */
921 struct execution_control_state
923 struct target_waitstatus ws
;
924 struct target_waitstatus
*wp
;
927 CORE_ADDR stop_func_start
;
928 CORE_ADDR stop_func_end
;
929 char *stop_func_name
;
930 struct symtab_and_line sal
;
932 struct symtab
*current_symtab
;
933 int handling_longjmp
; /* FIXME */
935 ptid_t saved_inferior_ptid
;
936 int step_after_step_resume_breakpoint
;
937 int stepping_through_solib_after_catch
;
938 bpstat stepping_through_solib_catchpoints
;
939 int new_thread_event
;
940 struct target_waitstatus tmpstatus
;
941 enum infwait_states infwait_state
;
946 void init_execution_control_state (struct execution_control_state
*ecs
);
948 void handle_inferior_event (struct execution_control_state
*ecs
);
950 static void step_into_function (struct execution_control_state
*ecs
);
951 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
952 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
953 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
954 struct frame_id sr_id
);
955 static void stop_stepping (struct execution_control_state
*ecs
);
956 static void prepare_to_wait (struct execution_control_state
*ecs
);
957 static void keep_going (struct execution_control_state
*ecs
);
958 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
961 /* Wait for control to return from inferior to debugger.
962 If inferior gets a signal, we may decide to start it up again
963 instead of returning. That is why there is a loop in this function.
964 When this function actually returns it means the inferior
965 should be left stopped and GDB should read more commands. */
968 wait_for_inferior (void)
970 struct cleanup
*old_cleanups
;
971 struct execution_control_state ecss
;
972 struct execution_control_state
*ecs
;
975 fprintf_unfiltered (gdb_stdlog
, "infrun: wait_for_inferior\n");
977 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
978 &step_resume_breakpoint
);
980 /* wfi still stays in a loop, so it's OK just to take the address of
981 a local to get the ecs pointer. */
984 /* Fill in with reasonable starting values. */
985 init_execution_control_state (ecs
);
987 /* We'll update this if & when we switch to a new thread. */
988 previous_inferior_ptid
= inferior_ptid
;
990 overlay_cache_invalid
= 1;
992 /* We have to invalidate the registers BEFORE calling target_wait
993 because they can be loaded from the target while in target_wait.
994 This makes remote debugging a bit more efficient for those
995 targets that provide critical registers as part of their normal
998 registers_changed ();
1002 if (deprecated_target_wait_hook
)
1003 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1005 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1007 /* Now figure out what to do with the result of the result. */
1008 handle_inferior_event (ecs
);
1010 if (!ecs
->wait_some_more
)
1013 do_cleanups (old_cleanups
);
1016 /* Asynchronous version of wait_for_inferior. It is called by the
1017 event loop whenever a change of state is detected on the file
1018 descriptor corresponding to the target. It can be called more than
1019 once to complete a single execution command. In such cases we need
1020 to keep the state in a global variable ASYNC_ECSS. If it is the
1021 last time that this function is called for a single execution
1022 command, then report to the user that the inferior has stopped, and
1023 do the necessary cleanups. */
1025 struct execution_control_state async_ecss
;
1026 struct execution_control_state
*async_ecs
;
1029 fetch_inferior_event (void *client_data
)
1031 static struct cleanup
*old_cleanups
;
1033 async_ecs
= &async_ecss
;
1035 if (!async_ecs
->wait_some_more
)
1037 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1038 &step_resume_breakpoint
);
1040 /* Fill in with reasonable starting values. */
1041 init_execution_control_state (async_ecs
);
1043 /* We'll update this if & when we switch to a new thread. */
1044 previous_inferior_ptid
= inferior_ptid
;
1046 overlay_cache_invalid
= 1;
1048 /* We have to invalidate the registers BEFORE calling target_wait
1049 because they can be loaded from the target while in target_wait.
1050 This makes remote debugging a bit more efficient for those
1051 targets that provide critical registers as part of their normal
1052 status mechanism. */
1054 registers_changed ();
1057 if (deprecated_target_wait_hook
)
1059 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1061 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1063 /* Now figure out what to do with the result of the result. */
1064 handle_inferior_event (async_ecs
);
1066 if (!async_ecs
->wait_some_more
)
1068 /* Do only the cleanups that have been added by this
1069 function. Let the continuations for the commands do the rest,
1070 if there are any. */
1071 do_exec_cleanups (old_cleanups
);
1073 if (step_multi
&& stop_step
)
1074 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1076 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1080 /* Prepare an execution control state for looping through a
1081 wait_for_inferior-type loop. */
1084 init_execution_control_state (struct execution_control_state
*ecs
)
1086 ecs
->another_trap
= 0;
1087 ecs
->random_signal
= 0;
1088 ecs
->step_after_step_resume_breakpoint
= 0;
1089 ecs
->handling_longjmp
= 0; /* FIXME */
1090 ecs
->stepping_through_solib_after_catch
= 0;
1091 ecs
->stepping_through_solib_catchpoints
= NULL
;
1092 ecs
->sal
= find_pc_line (prev_pc
, 0);
1093 ecs
->current_line
= ecs
->sal
.line
;
1094 ecs
->current_symtab
= ecs
->sal
.symtab
;
1095 ecs
->infwait_state
= infwait_normal_state
;
1096 ecs
->waiton_ptid
= pid_to_ptid (-1);
1097 ecs
->wp
= &(ecs
->ws
);
1100 /* Return the cached copy of the last pid/waitstatus returned by
1101 target_wait()/deprecated_target_wait_hook(). The data is actually
1102 cached by handle_inferior_event(), which gets called immediately
1103 after target_wait()/deprecated_target_wait_hook(). */
1106 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1108 *ptidp
= target_last_wait_ptid
;
1109 *status
= target_last_waitstatus
;
1113 nullify_last_target_wait_ptid (void)
1115 target_last_wait_ptid
= minus_one_ptid
;
1118 /* Switch thread contexts, maintaining "infrun state". */
1121 context_switch (struct execution_control_state
*ecs
)
1123 /* Caution: it may happen that the new thread (or the old one!)
1124 is not in the thread list. In this case we must not attempt
1125 to "switch context", or we run the risk that our context may
1126 be lost. This may happen as a result of the target module
1127 mishandling thread creation. */
1129 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1130 { /* Perform infrun state context switch: */
1131 /* Save infrun state for the old thread. */
1132 save_infrun_state (inferior_ptid
, prev_pc
,
1133 trap_expected
, step_resume_breakpoint
,
1135 step_range_end
, &step_frame_id
,
1136 ecs
->handling_longjmp
, ecs
->another_trap
,
1137 ecs
->stepping_through_solib_after_catch
,
1138 ecs
->stepping_through_solib_catchpoints
,
1139 ecs
->current_line
, ecs
->current_symtab
);
1141 /* Load infrun state for the new thread. */
1142 load_infrun_state (ecs
->ptid
, &prev_pc
,
1143 &trap_expected
, &step_resume_breakpoint
,
1145 &step_range_end
, &step_frame_id
,
1146 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1147 &ecs
->stepping_through_solib_after_catch
,
1148 &ecs
->stepping_through_solib_catchpoints
,
1149 &ecs
->current_line
, &ecs
->current_symtab
);
1151 inferior_ptid
= ecs
->ptid
;
1155 adjust_pc_after_break (struct execution_control_state
*ecs
)
1157 CORE_ADDR breakpoint_pc
;
1159 /* If this target does not decrement the PC after breakpoints, then
1160 we have nothing to do. */
1161 if (DECR_PC_AFTER_BREAK
== 0)
1164 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1165 we aren't, just return.
1167 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1168 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1169 by software breakpoints should be handled through the normal breakpoint
1172 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1173 different signals (SIGILL or SIGEMT for instance), but it is less
1174 clear where the PC is pointing afterwards. It may not match
1175 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1176 these signals at breakpoints (the code has been in GDB since at least
1177 1992) so I can not guess how to handle them here.
1179 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1180 would have the PC after hitting a watchpoint affected by
1181 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1182 in GDB history, and it seems unlikely to be correct, so
1183 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1185 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1188 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1191 /* Find the location where (if we've hit a breakpoint) the
1192 breakpoint would be. */
1193 breakpoint_pc
= read_pc_pid (ecs
->ptid
) - DECR_PC_AFTER_BREAK
;
1195 if (SOFTWARE_SINGLE_STEP_P ())
1197 /* When using software single-step, a SIGTRAP can only indicate
1198 an inserted breakpoint. This actually makes things
1200 if (singlestep_breakpoints_inserted_p
)
1201 /* When software single stepping, the instruction at [prev_pc]
1202 is never a breakpoint, but the instruction following
1203 [prev_pc] (in program execution order) always is. Assume
1204 that following instruction was reached and hence a software
1205 breakpoint was hit. */
1206 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1207 else if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1208 /* The inferior was free running (i.e., no single-step
1209 breakpoints inserted) and it hit a software breakpoint. */
1210 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1214 /* When using hardware single-step, a SIGTRAP is reported for
1215 both a completed single-step and a software breakpoint. Need
1216 to differentiate between the two as the latter needs
1217 adjusting but the former does not.
1219 When the thread to be examined does not match the current thread
1220 context we can't use currently_stepping, so assume no
1221 single-stepping in this case. */
1222 if (ptid_equal (ecs
->ptid
, inferior_ptid
) && currently_stepping (ecs
))
1224 if (prev_pc
== breakpoint_pc
1225 && software_breakpoint_inserted_here_p (breakpoint_pc
))
1226 /* Hardware single-stepped a software breakpoint (as
1227 occures when the inferior is resumed with PC pointing
1228 at not-yet-hit software breakpoint). Since the
1229 breakpoint really is executed, the inferior needs to be
1230 backed up to the breakpoint address. */
1231 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1235 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1236 /* The inferior was free running (i.e., no hardware
1237 single-step and no possibility of a false SIGTRAP) and
1238 hit a software breakpoint. */
1239 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1244 /* Given an execution control state that has been freshly filled in
1245 by an event from the inferior, figure out what it means and take
1246 appropriate action. */
1248 int stepped_after_stopped_by_watchpoint
;
1251 handle_inferior_event (struct execution_control_state
*ecs
)
1253 /* NOTE: bje/2005-05-02: If you're looking at this code and thinking
1254 that the variable stepped_after_stopped_by_watchpoint isn't used,
1255 then you're wrong! See remote.c:remote_stopped_data_address. */
1257 int sw_single_step_trap_p
= 0;
1258 int stopped_by_watchpoint
= -1; /* Mark as unknown. */
1260 /* Cache the last pid/waitstatus. */
1261 target_last_wait_ptid
= ecs
->ptid
;
1262 target_last_waitstatus
= *ecs
->wp
;
1264 adjust_pc_after_break (ecs
);
1266 switch (ecs
->infwait_state
)
1268 case infwait_thread_hop_state
:
1270 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1271 /* Cancel the waiton_ptid. */
1272 ecs
->waiton_ptid
= pid_to_ptid (-1);
1275 case infwait_normal_state
:
1277 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
1278 stepped_after_stopped_by_watchpoint
= 0;
1281 case infwait_nonstep_watch_state
:
1283 fprintf_unfiltered (gdb_stdlog
,
1284 "infrun: infwait_nonstep_watch_state\n");
1285 insert_breakpoints ();
1287 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1288 handle things like signals arriving and other things happening
1289 in combination correctly? */
1290 stepped_after_stopped_by_watchpoint
= 1;
1294 internal_error (__FILE__
, __LINE__
, _("bad switch"));
1296 ecs
->infwait_state
= infwait_normal_state
;
1298 flush_cached_frames ();
1300 /* If it's a new process, add it to the thread database */
1302 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1303 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1304 && !in_thread_list (ecs
->ptid
));
1306 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1307 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1309 add_thread (ecs
->ptid
);
1311 ui_out_text (uiout
, "[New ");
1312 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1313 ui_out_text (uiout
, "]\n");
1316 switch (ecs
->ws
.kind
)
1318 case TARGET_WAITKIND_LOADED
:
1320 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
1321 /* Ignore gracefully during startup of the inferior, as it
1322 might be the shell which has just loaded some objects,
1323 otherwise add the symbols for the newly loaded objects. */
1325 if (stop_soon
== NO_STOP_QUIETLY
)
1327 /* Remove breakpoints, SOLIB_ADD might adjust
1328 breakpoint addresses via breakpoint_re_set. */
1329 if (breakpoints_inserted
)
1330 remove_breakpoints ();
1332 /* Check for any newly added shared libraries if we're
1333 supposed to be adding them automatically. Switch
1334 terminal for any messages produced by
1335 breakpoint_re_set. */
1336 target_terminal_ours_for_output ();
1337 /* NOTE: cagney/2003-11-25: Make certain that the target
1338 stack's section table is kept up-to-date. Architectures,
1339 (e.g., PPC64), use the section table to perform
1340 operations such as address => section name and hence
1341 require the table to contain all sections (including
1342 those found in shared libraries). */
1343 /* NOTE: cagney/2003-11-25: Pass current_target and not
1344 exec_ops to SOLIB_ADD. This is because current GDB is
1345 only tooled to propagate section_table changes out from
1346 the "current_target" (see target_resize_to_sections), and
1347 not up from the exec stratum. This, of course, isn't
1348 right. "infrun.c" should only interact with the
1349 exec/process stratum, instead relying on the target stack
1350 to propagate relevant changes (stop, section table
1351 changed, ...) up to other layers. */
1352 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1353 target_terminal_inferior ();
1355 /* Reinsert breakpoints and continue. */
1356 if (breakpoints_inserted
)
1357 insert_breakpoints ();
1360 resume (0, TARGET_SIGNAL_0
);
1361 prepare_to_wait (ecs
);
1364 case TARGET_WAITKIND_SPURIOUS
:
1366 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1367 resume (0, TARGET_SIGNAL_0
);
1368 prepare_to_wait (ecs
);
1371 case TARGET_WAITKIND_EXITED
:
1373 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
1374 target_terminal_ours (); /* Must do this before mourn anyway */
1375 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1377 /* Record the exit code in the convenience variable $_exitcode, so
1378 that the user can inspect this again later. */
1379 set_internalvar (lookup_internalvar ("_exitcode"),
1380 value_from_longest (builtin_type_int
,
1381 (LONGEST
) ecs
->ws
.value
.integer
));
1382 gdb_flush (gdb_stdout
);
1383 target_mourn_inferior ();
1384 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1385 stop_print_frame
= 0;
1386 stop_stepping (ecs
);
1389 case TARGET_WAITKIND_SIGNALLED
:
1391 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1392 stop_print_frame
= 0;
1393 stop_signal
= ecs
->ws
.value
.sig
;
1394 target_terminal_ours (); /* Must do this before mourn anyway */
1396 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1397 reach here unless the inferior is dead. However, for years
1398 target_kill() was called here, which hints that fatal signals aren't
1399 really fatal on some systems. If that's true, then some changes
1401 target_mourn_inferior ();
1403 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1404 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1405 stop_stepping (ecs
);
1408 /* The following are the only cases in which we keep going;
1409 the above cases end in a continue or goto. */
1410 case TARGET_WAITKIND_FORKED
:
1411 case TARGET_WAITKIND_VFORKED
:
1413 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
1414 stop_signal
= TARGET_SIGNAL_TRAP
;
1415 pending_follow
.kind
= ecs
->ws
.kind
;
1417 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1418 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1420 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1422 context_switch (ecs
);
1423 flush_cached_frames ();
1426 stop_pc
= read_pc ();
1428 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1430 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1432 /* If no catchpoint triggered for this, then keep going. */
1433 if (ecs
->random_signal
)
1435 stop_signal
= TARGET_SIGNAL_0
;
1439 goto process_event_stop_test
;
1441 case TARGET_WAITKIND_EXECD
:
1443 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
1444 stop_signal
= TARGET_SIGNAL_TRAP
;
1446 /* NOTE drow/2002-12-05: This code should be pushed down into the
1447 target_wait function. Until then following vfork on HP/UX 10.20
1448 is probably broken by this. Of course, it's broken anyway. */
1449 /* Is this a target which reports multiple exec events per actual
1450 call to exec()? (HP-UX using ptrace does, for example.) If so,
1451 ignore all but the last one. Just resume the exec'r, and wait
1452 for the next exec event. */
1453 if (inferior_ignoring_leading_exec_events
)
1455 inferior_ignoring_leading_exec_events
--;
1456 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1457 prepare_to_wait (ecs
);
1460 inferior_ignoring_leading_exec_events
=
1461 target_reported_exec_events_per_exec_call () - 1;
1463 pending_follow
.execd_pathname
=
1464 savestring (ecs
->ws
.value
.execd_pathname
,
1465 strlen (ecs
->ws
.value
.execd_pathname
));
1467 /* This causes the eventpoints and symbol table to be reset. Must
1468 do this now, before trying to determine whether to stop. */
1469 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1470 xfree (pending_follow
.execd_pathname
);
1472 stop_pc
= read_pc_pid (ecs
->ptid
);
1473 ecs
->saved_inferior_ptid
= inferior_ptid
;
1474 inferior_ptid
= ecs
->ptid
;
1476 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1478 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1479 inferior_ptid
= ecs
->saved_inferior_ptid
;
1481 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1483 context_switch (ecs
);
1484 flush_cached_frames ();
1487 /* If no catchpoint triggered for this, then keep going. */
1488 if (ecs
->random_signal
)
1490 stop_signal
= TARGET_SIGNAL_0
;
1494 goto process_event_stop_test
;
1496 /* Be careful not to try to gather much state about a thread
1497 that's in a syscall. It's frequently a losing proposition. */
1498 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1500 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1501 resume (0, TARGET_SIGNAL_0
);
1502 prepare_to_wait (ecs
);
1505 /* Before examining the threads further, step this thread to
1506 get it entirely out of the syscall. (We get notice of the
1507 event when the thread is just on the verge of exiting a
1508 syscall. Stepping one instruction seems to get it back
1510 case TARGET_WAITKIND_SYSCALL_RETURN
:
1512 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1513 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1514 prepare_to_wait (ecs
);
1517 case TARGET_WAITKIND_STOPPED
:
1519 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
1520 stop_signal
= ecs
->ws
.value
.sig
;
1523 /* We had an event in the inferior, but we are not interested
1524 in handling it at this level. The lower layers have already
1525 done what needs to be done, if anything.
1527 One of the possible circumstances for this is when the
1528 inferior produces output for the console. The inferior has
1529 not stopped, and we are ignoring the event. Another possible
1530 circumstance is any event which the lower level knows will be
1531 reported multiple times without an intervening resume. */
1532 case TARGET_WAITKIND_IGNORE
:
1534 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
1535 prepare_to_wait (ecs
);
1539 /* We may want to consider not doing a resume here in order to give
1540 the user a chance to play with the new thread. It might be good
1541 to make that a user-settable option. */
1543 /* At this point, all threads are stopped (happens automatically in
1544 either the OS or the native code). Therefore we need to continue
1545 all threads in order to make progress. */
1546 if (ecs
->new_thread_event
)
1548 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1549 prepare_to_wait (ecs
);
1553 stop_pc
= read_pc_pid (ecs
->ptid
);
1556 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc
));
1558 if (stepping_past_singlestep_breakpoint
)
1560 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1561 && singlestep_breakpoints_inserted_p
);
1562 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1563 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1565 stepping_past_singlestep_breakpoint
= 0;
1567 /* We've either finished single-stepping past the single-step
1568 breakpoint, or stopped for some other reason. It would be nice if
1569 we could tell, but we can't reliably. */
1570 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1573 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
1574 /* Pull the single step breakpoints out of the target. */
1575 SOFTWARE_SINGLE_STEP (0, 0);
1576 singlestep_breakpoints_inserted_p
= 0;
1578 ecs
->random_signal
= 0;
1580 ecs
->ptid
= saved_singlestep_ptid
;
1581 context_switch (ecs
);
1582 if (deprecated_context_hook
)
1583 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1585 resume (1, TARGET_SIGNAL_0
);
1586 prepare_to_wait (ecs
);
1591 stepping_past_singlestep_breakpoint
= 0;
1593 /* See if a thread hit a thread-specific breakpoint that was meant for
1594 another thread. If so, then step that thread past the breakpoint,
1597 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1599 int thread_hop_needed
= 0;
1601 /* Check if a regular breakpoint has been hit before checking
1602 for a potential single step breakpoint. Otherwise, GDB will
1603 not see this breakpoint hit when stepping onto breakpoints. */
1604 if (breakpoints_inserted
&& breakpoint_here_p (stop_pc
))
1606 ecs
->random_signal
= 0;
1607 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1608 thread_hop_needed
= 1;
1610 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1612 ecs
->random_signal
= 0;
1613 /* The call to in_thread_list is necessary because PTIDs sometimes
1614 change when we go from single-threaded to multi-threaded. If
1615 the singlestep_ptid is still in the list, assume that it is
1616 really different from ecs->ptid. */
1617 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1618 && in_thread_list (singlestep_ptid
))
1620 thread_hop_needed
= 1;
1621 stepping_past_singlestep_breakpoint
= 1;
1622 saved_singlestep_ptid
= singlestep_ptid
;
1626 if (thread_hop_needed
)
1631 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
1633 /* Saw a breakpoint, but it was hit by the wrong thread.
1636 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1638 /* Pull the single step breakpoints out of the target. */
1639 SOFTWARE_SINGLE_STEP (0, 0);
1640 singlestep_breakpoints_inserted_p
= 0;
1643 remove_status
= remove_breakpoints ();
1644 /* Did we fail to remove breakpoints? If so, try
1645 to set the PC past the bp. (There's at least
1646 one situation in which we can fail to remove
1647 the bp's: On HP-UX's that use ttrace, we can't
1648 change the address space of a vforking child
1649 process until the child exits (well, okay, not
1650 then either :-) or execs. */
1651 if (remove_status
!= 0)
1653 /* FIXME! This is obviously non-portable! */
1654 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1655 /* We need to restart all the threads now,
1656 * unles we're running in scheduler-locked mode.
1657 * Use currently_stepping to determine whether to
1660 /* FIXME MVS: is there any reason not to call resume()? */
1661 if (scheduler_mode
== schedlock_on
)
1662 target_resume (ecs
->ptid
,
1663 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1665 target_resume (RESUME_ALL
,
1666 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1667 prepare_to_wait (ecs
);
1672 breakpoints_inserted
= 0;
1673 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1674 context_switch (ecs
);
1675 ecs
->waiton_ptid
= ecs
->ptid
;
1676 ecs
->wp
= &(ecs
->ws
);
1677 ecs
->another_trap
= 1;
1679 ecs
->infwait_state
= infwait_thread_hop_state
;
1681 registers_changed ();
1685 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1687 sw_single_step_trap_p
= 1;
1688 ecs
->random_signal
= 0;
1692 ecs
->random_signal
= 1;
1694 /* See if something interesting happened to the non-current thread. If
1695 so, then switch to that thread. */
1696 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1699 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
1701 context_switch (ecs
);
1703 if (deprecated_context_hook
)
1704 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1706 flush_cached_frames ();
1709 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1711 /* Pull the single step breakpoints out of the target. */
1712 SOFTWARE_SINGLE_STEP (0, 0);
1713 singlestep_breakpoints_inserted_p
= 0;
1716 /* It may not be necessary to disable the watchpoint to stop over
1717 it. For example, the PA can (with some kernel cooperation)
1718 single step over a watchpoint without disabling the watchpoint. */
1719 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1722 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1724 prepare_to_wait (ecs
);
1728 /* It is far more common to need to disable a watchpoint to step
1729 the inferior over it. FIXME. What else might a debug
1730 register or page protection watchpoint scheme need here? */
1731 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1733 /* At this point, we are stopped at an instruction which has
1734 attempted to write to a piece of memory under control of
1735 a watchpoint. The instruction hasn't actually executed
1736 yet. If we were to evaluate the watchpoint expression
1737 now, we would get the old value, and therefore no change
1738 would seem to have occurred.
1740 In order to make watchpoints work `right', we really need
1741 to complete the memory write, and then evaluate the
1742 watchpoint expression. The following code does that by
1743 removing the watchpoint (actually, all watchpoints and
1744 breakpoints), single-stepping the target, re-inserting
1745 watchpoints, and then falling through to let normal
1746 single-step processing handle proceed. Since this
1747 includes evaluating watchpoints, things will come to a
1748 stop in the correct manner. */
1751 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1752 remove_breakpoints ();
1753 registers_changed ();
1754 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1756 ecs
->waiton_ptid
= ecs
->ptid
;
1757 ecs
->wp
= &(ecs
->ws
);
1758 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1759 prepare_to_wait (ecs
);
1763 /* It may be possible to simply continue after a watchpoint. */
1764 if (HAVE_CONTINUABLE_WATCHPOINT
)
1765 stopped_by_watchpoint
= STOPPED_BY_WATCHPOINT (ecs
->ws
);
1767 ecs
->stop_func_start
= 0;
1768 ecs
->stop_func_end
= 0;
1769 ecs
->stop_func_name
= 0;
1770 /* Don't care about return value; stop_func_start and stop_func_name
1771 will both be 0 if it doesn't work. */
1772 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1773 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1774 ecs
->stop_func_start
+= DEPRECATED_FUNCTION_START_OFFSET
;
1775 ecs
->another_trap
= 0;
1776 bpstat_clear (&stop_bpstat
);
1778 stop_stack_dummy
= 0;
1779 stop_print_frame
= 1;
1780 ecs
->random_signal
= 0;
1781 stopped_by_random_signal
= 0;
1782 breakpoints_failed
= 0;
1784 if (stop_signal
== TARGET_SIGNAL_TRAP
1786 && gdbarch_single_step_through_delay_p (current_gdbarch
)
1787 && currently_stepping (ecs
))
1789 /* We're trying to step of a breakpoint. Turns out that we're
1790 also on an instruction that needs to be stepped multiple
1791 times before it's been fully executing. E.g., architectures
1792 with a delay slot. It needs to be stepped twice, once for
1793 the instruction and once for the delay slot. */
1794 int step_through_delay
1795 = gdbarch_single_step_through_delay (current_gdbarch
,
1796 get_current_frame ());
1797 if (debug_infrun
&& step_through_delay
)
1798 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
1799 if (step_range_end
== 0 && step_through_delay
)
1801 /* The user issued a continue when stopped at a breakpoint.
1802 Set up for another trap and get out of here. */
1803 ecs
->another_trap
= 1;
1807 else if (step_through_delay
)
1809 /* The user issued a step when stopped at a breakpoint.
1810 Maybe we should stop, maybe we should not - the delay
1811 slot *might* correspond to a line of source. In any
1812 case, don't decide that here, just set ecs->another_trap,
1813 making sure we single-step again before breakpoints are
1815 ecs
->another_trap
= 1;
1819 /* Look at the cause of the stop, and decide what to do.
1820 The alternatives are:
1821 1) break; to really stop and return to the debugger,
1822 2) drop through to start up again
1823 (set ecs->another_trap to 1 to single step once)
1824 3) set ecs->random_signal to 1, and the decision between 1 and 2
1825 will be made according to the signal handling tables. */
1827 /* First, distinguish signals caused by the debugger from signals
1828 that have to do with the program's own actions. Note that
1829 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1830 on the operating system version. Here we detect when a SIGILL or
1831 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1832 something similar for SIGSEGV, since a SIGSEGV will be generated
1833 when we're trying to execute a breakpoint instruction on a
1834 non-executable stack. This happens for call dummy breakpoints
1835 for architectures like SPARC that place call dummies on the
1838 if (stop_signal
== TARGET_SIGNAL_TRAP
1839 || (breakpoints_inserted
1840 && (stop_signal
== TARGET_SIGNAL_ILL
1841 || stop_signal
== TARGET_SIGNAL_SEGV
1842 || stop_signal
== TARGET_SIGNAL_EMT
))
1843 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1845 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1848 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
1849 stop_print_frame
= 0;
1850 stop_stepping (ecs
);
1854 /* This is originated from start_remote(), start_inferior() and
1855 shared libraries hook functions. */
1856 if (stop_soon
== STOP_QUIETLY
)
1859 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
1860 stop_stepping (ecs
);
1864 /* This originates from attach_command(). We need to overwrite
1865 the stop_signal here, because some kernels don't ignore a
1866 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1867 See more comments in inferior.h. */
1868 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1870 stop_stepping (ecs
);
1871 if (stop_signal
== TARGET_SIGNAL_STOP
)
1872 stop_signal
= TARGET_SIGNAL_0
;
1876 /* Don't even think about breakpoints if just proceeded over a
1878 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
)
1881 fprintf_unfiltered (gdb_stdlog
, "infrun: trap expected\n");
1882 bpstat_clear (&stop_bpstat
);
1886 /* See if there is a breakpoint at the current PC. */
1887 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
,
1888 stopped_by_watchpoint
);
1890 /* Following in case break condition called a
1892 stop_print_frame
= 1;
1895 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1896 at one stage in the past included checks for an inferior
1897 function call's call dummy's return breakpoint. The original
1898 comment, that went with the test, read:
1900 ``End of a stack dummy. Some systems (e.g. Sony news) give
1901 another signal besides SIGTRAP, so check here as well as
1904 If someone ever tries to get get call dummys on a
1905 non-executable stack to work (where the target would stop
1906 with something like a SIGSEGV), then those tests might need
1907 to be re-instated. Given, however, that the tests were only
1908 enabled when momentary breakpoints were not being used, I
1909 suspect that it won't be the case.
1911 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1912 be necessary for call dummies on a non-executable stack on
1915 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1917 = !(bpstat_explains_signal (stop_bpstat
)
1919 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1922 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1923 if (!ecs
->random_signal
)
1924 stop_signal
= TARGET_SIGNAL_TRAP
;
1928 /* When we reach this point, we've pretty much decided
1929 that the reason for stopping must've been a random
1930 (unexpected) signal. */
1933 ecs
->random_signal
= 1;
1935 process_event_stop_test
:
1936 /* For the program's own signals, act according to
1937 the signal handling tables. */
1939 if (ecs
->random_signal
)
1941 /* Signal not for debugging purposes. */
1945 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
1947 stopped_by_random_signal
= 1;
1949 if (signal_print
[stop_signal
])
1952 target_terminal_ours_for_output ();
1953 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1955 if (signal_stop
[stop_signal
])
1957 stop_stepping (ecs
);
1960 /* If not going to stop, give terminal back
1961 if we took it away. */
1963 target_terminal_inferior ();
1965 /* Clear the signal if it should not be passed. */
1966 if (signal_program
[stop_signal
] == 0)
1967 stop_signal
= TARGET_SIGNAL_0
;
1969 if (prev_pc
== read_pc ()
1970 && !breakpoints_inserted
1971 && breakpoint_here_p (read_pc ())
1972 && step_resume_breakpoint
== NULL
)
1974 /* We were just starting a new sequence, attempting to
1975 single-step off of a breakpoint and expecting a SIGTRAP.
1976 Intead this signal arrives. This signal will take us out
1977 of the stepping range so GDB needs to remember to, when
1978 the signal handler returns, resume stepping off that
1980 /* To simplify things, "continue" is forced to use the same
1981 code paths as single-step - set a breakpoint at the
1982 signal return address and then, once hit, step off that
1984 insert_step_resume_breakpoint_at_frame (get_current_frame ());
1985 ecs
->step_after_step_resume_breakpoint
= 1;
1990 if (step_range_end
!= 0
1991 && stop_signal
!= TARGET_SIGNAL_0
1992 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
1993 && frame_id_eq (get_frame_id (get_current_frame ()),
1995 && step_resume_breakpoint
== NULL
)
1997 /* The inferior is about to take a signal that will take it
1998 out of the single step range. Set a breakpoint at the
1999 current PC (which is presumably where the signal handler
2000 will eventually return) and then allow the inferior to
2003 Note that this is only needed for a signal delivered
2004 while in the single-step range. Nested signals aren't a
2005 problem as they eventually all return. */
2006 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2011 /* Note: step_resume_breakpoint may be non-NULL. This occures
2012 when either there's a nested signal, or when there's a
2013 pending signal enabled just as the signal handler returns
2014 (leaving the inferior at the step-resume-breakpoint without
2015 actually executing it). Either way continue until the
2016 breakpoint is really hit. */
2021 /* Handle cases caused by hitting a breakpoint. */
2023 CORE_ADDR jmp_buf_pc
;
2024 struct bpstat_what what
;
2026 what
= bpstat_what (stop_bpstat
);
2028 if (what
.call_dummy
)
2030 stop_stack_dummy
= 1;
2033 switch (what
.main_action
)
2035 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2036 /* If we hit the breakpoint at longjmp, disable it for the
2037 duration of this command. Then, install a temporary
2038 breakpoint at the target of the jmp_buf. */
2040 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2041 disable_longjmp_breakpoint ();
2042 remove_breakpoints ();
2043 breakpoints_inserted
= 0;
2044 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
2050 /* Need to blow away step-resume breakpoint, as it
2051 interferes with us */
2052 if (step_resume_breakpoint
!= NULL
)
2054 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2057 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2058 ecs
->handling_longjmp
= 1; /* FIXME */
2062 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2063 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2065 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2066 remove_breakpoints ();
2067 breakpoints_inserted
= 0;
2068 disable_longjmp_breakpoint ();
2069 ecs
->handling_longjmp
= 0; /* FIXME */
2070 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2072 /* else fallthrough */
2074 case BPSTAT_WHAT_SINGLE
:
2076 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2077 if (breakpoints_inserted
)
2079 remove_breakpoints ();
2081 breakpoints_inserted
= 0;
2082 ecs
->another_trap
= 1;
2083 /* Still need to check other stuff, at least the case
2084 where we are stepping and step out of the right range. */
2087 case BPSTAT_WHAT_STOP_NOISY
:
2089 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2090 stop_print_frame
= 1;
2092 /* We are about to nuke the step_resume_breakpointt via the
2093 cleanup chain, so no need to worry about it here. */
2095 stop_stepping (ecs
);
2098 case BPSTAT_WHAT_STOP_SILENT
:
2100 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2101 stop_print_frame
= 0;
2103 /* We are about to nuke the step_resume_breakpoin via the
2104 cleanup chain, so no need to worry about it here. */
2106 stop_stepping (ecs
);
2109 case BPSTAT_WHAT_STEP_RESUME
:
2110 /* This proably demands a more elegant solution, but, yeah
2113 This function's use of the simple variable
2114 step_resume_breakpoint doesn't seem to accomodate
2115 simultaneously active step-resume bp's, although the
2116 breakpoint list certainly can.
2118 If we reach here and step_resume_breakpoint is already
2119 NULL, then apparently we have multiple active
2120 step-resume bp's. We'll just delete the breakpoint we
2121 stopped at, and carry on.
2123 Correction: what the code currently does is delete a
2124 step-resume bp, but it makes no effort to ensure that
2125 the one deleted is the one currently stopped at. MVS */
2128 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2130 if (step_resume_breakpoint
== NULL
)
2132 step_resume_breakpoint
=
2133 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2135 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2136 if (ecs
->step_after_step_resume_breakpoint
)
2138 /* Back when the step-resume breakpoint was inserted, we
2139 were trying to single-step off a breakpoint. Go back
2141 ecs
->step_after_step_resume_breakpoint
= 0;
2142 remove_breakpoints ();
2143 breakpoints_inserted
= 0;
2144 ecs
->another_trap
= 1;
2150 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2152 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_THROUGH_SIGTRAMP\n");
2153 /* If were waiting for a trap, hitting the step_resume_break
2154 doesn't count as getting it. */
2156 ecs
->another_trap
= 1;
2159 case BPSTAT_WHAT_CHECK_SHLIBS
:
2160 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2163 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2164 /* Remove breakpoints, we eventually want to step over the
2165 shlib event breakpoint, and SOLIB_ADD might adjust
2166 breakpoint addresses via breakpoint_re_set. */
2167 if (breakpoints_inserted
)
2168 remove_breakpoints ();
2169 breakpoints_inserted
= 0;
2171 /* Check for any newly added shared libraries if we're
2172 supposed to be adding them automatically. Switch
2173 terminal for any messages produced by
2174 breakpoint_re_set. */
2175 target_terminal_ours_for_output ();
2176 /* NOTE: cagney/2003-11-25: Make certain that the target
2177 stack's section table is kept up-to-date. Architectures,
2178 (e.g., PPC64), use the section table to perform
2179 operations such as address => section name and hence
2180 require the table to contain all sections (including
2181 those found in shared libraries). */
2182 /* NOTE: cagney/2003-11-25: Pass current_target and not
2183 exec_ops to SOLIB_ADD. This is because current GDB is
2184 only tooled to propagate section_table changes out from
2185 the "current_target" (see target_resize_to_sections), and
2186 not up from the exec stratum. This, of course, isn't
2187 right. "infrun.c" should only interact with the
2188 exec/process stratum, instead relying on the target stack
2189 to propagate relevant changes (stop, section table
2190 changed, ...) up to other layers. */
2192 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2194 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2196 target_terminal_inferior ();
2198 /* Try to reenable shared library breakpoints, additional
2199 code segments in shared libraries might be mapped in now. */
2200 re_enable_breakpoints_in_shlibs ();
2202 /* If requested, stop when the dynamic linker notifies
2203 gdb of events. This allows the user to get control
2204 and place breakpoints in initializer routines for
2205 dynamically loaded objects (among other things). */
2206 if (stop_on_solib_events
|| stop_stack_dummy
)
2208 stop_stepping (ecs
);
2212 /* If we stopped due to an explicit catchpoint, then the
2213 (see above) call to SOLIB_ADD pulled in any symbols
2214 from a newly-loaded library, if appropriate.
2216 We do want the inferior to stop, but not where it is
2217 now, which is in the dynamic linker callback. Rather,
2218 we would like it stop in the user's program, just after
2219 the call that caused this catchpoint to trigger. That
2220 gives the user a more useful vantage from which to
2221 examine their program's state. */
2222 else if (what
.main_action
2223 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2225 /* ??rehrauer: If I could figure out how to get the
2226 right return PC from here, we could just set a temp
2227 breakpoint and resume. I'm not sure we can without
2228 cracking open the dld's shared libraries and sniffing
2229 their unwind tables and text/data ranges, and that's
2230 not a terribly portable notion.
2232 Until that time, we must step the inferior out of the
2233 dld callback, and also out of the dld itself (and any
2234 code or stubs in libdld.sl, such as "shl_load" and
2235 friends) until we reach non-dld code. At that point,
2236 we can stop stepping. */
2237 bpstat_get_triggered_catchpoints (stop_bpstat
,
2239 stepping_through_solib_catchpoints
);
2240 ecs
->stepping_through_solib_after_catch
= 1;
2242 /* Be sure to lift all breakpoints, so the inferior does
2243 actually step past this point... */
2244 ecs
->another_trap
= 1;
2249 /* We want to step over this breakpoint, then keep going. */
2250 ecs
->another_trap
= 1;
2256 case BPSTAT_WHAT_LAST
:
2257 /* Not a real code, but listed here to shut up gcc -Wall. */
2259 case BPSTAT_WHAT_KEEP_CHECKING
:
2264 /* We come here if we hit a breakpoint but should not
2265 stop for it. Possibly we also were stepping
2266 and should stop for that. So fall through and
2267 test for stepping. But, if not stepping,
2270 /* Are we stepping to get the inferior out of the dynamic linker's
2271 hook (and possibly the dld itself) after catching a shlib
2273 if (ecs
->stepping_through_solib_after_catch
)
2275 #if defined(SOLIB_ADD)
2276 /* Have we reached our destination? If not, keep going. */
2277 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2280 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2281 ecs
->another_trap
= 1;
2287 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2288 /* Else, stop and report the catchpoint(s) whose triggering
2289 caused us to begin stepping. */
2290 ecs
->stepping_through_solib_after_catch
= 0;
2291 bpstat_clear (&stop_bpstat
);
2292 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2293 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2294 stop_print_frame
= 1;
2295 stop_stepping (ecs
);
2299 if (step_resume_breakpoint
)
2302 fprintf_unfiltered (gdb_stdlog
, "infrun: step-resume breakpoint\n");
2304 /* Having a step-resume breakpoint overrides anything
2305 else having to do with stepping commands until
2306 that breakpoint is reached. */
2311 if (step_range_end
== 0)
2314 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
2315 /* Likewise if we aren't even stepping. */
2320 /* If stepping through a line, keep going if still within it.
2322 Note that step_range_end is the address of the first instruction
2323 beyond the step range, and NOT the address of the last instruction
2325 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2328 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
2329 paddr_nz (step_range_start
),
2330 paddr_nz (step_range_end
));
2335 /* We stepped out of the stepping range. */
2337 /* If we are stepping at the source level and entered the runtime
2338 loader dynamic symbol resolution code, we keep on single stepping
2339 until we exit the run time loader code and reach the callee's
2341 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2342 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2343 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
)
2345 && in_solib_dynsym_resolve_code (stop_pc
)
2349 CORE_ADDR pc_after_resolver
=
2350 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2353 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
2355 if (pc_after_resolver
)
2357 /* Set up a step-resume breakpoint at the address
2358 indicated by SKIP_SOLIB_RESOLVER. */
2359 struct symtab_and_line sr_sal
;
2361 sr_sal
.pc
= pc_after_resolver
;
2363 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2370 if (step_range_end
!= 1
2371 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2372 || step_over_calls
== STEP_OVER_ALL
)
2373 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2376 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
2377 /* The inferior, while doing a "step" or "next", has ended up in
2378 a signal trampoline (either by a signal being delivered or by
2379 the signal handler returning). Just single-step until the
2380 inferior leaves the trampoline (either by calling the handler
2386 /* Check for subroutine calls. The check for the current frame
2387 equalling the step ID is not necessary - the check of the
2388 previous frame's ID is sufficient - but it is a common case and
2389 cheaper than checking the previous frame's ID.
2391 NOTE: frame_id_eq will never report two invalid frame IDs as
2392 being equal, so to get into this block, both the current and
2393 previous frame must have valid frame IDs. */
2394 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
)
2395 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2397 CORE_ADDR real_stop_pc
;
2400 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
2402 if ((step_over_calls
== STEP_OVER_NONE
)
2403 || ((step_range_end
== 1)
2404 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2406 /* I presume that step_over_calls is only 0 when we're
2407 supposed to be stepping at the assembly language level
2408 ("stepi"). Just stop. */
2409 /* Also, maybe we just did a "nexti" inside a prolog, so we
2410 thought it was a subroutine call but it was not. Stop as
2413 print_stop_reason (END_STEPPING_RANGE
, 0);
2414 stop_stepping (ecs
);
2418 if (step_over_calls
== STEP_OVER_ALL
)
2420 /* We're doing a "next", set a breakpoint at callee's return
2421 address (the address at which the caller will
2423 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2428 /* If we are in a function call trampoline (a stub between the
2429 calling routine and the real function), locate the real
2430 function. That's what tells us (a) whether we want to step
2431 into it at all, and (b) what prologue we want to run to the
2432 end of, if we do step into it. */
2433 real_stop_pc
= skip_language_trampoline (stop_pc
);
2434 if (real_stop_pc
== 0)
2435 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2436 if (real_stop_pc
!= 0)
2437 ecs
->stop_func_start
= real_stop_pc
;
2440 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2441 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
)
2443 in_solib_dynsym_resolve_code (ecs
->stop_func_start
)
2447 struct symtab_and_line sr_sal
;
2449 sr_sal
.pc
= ecs
->stop_func_start
;
2451 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2456 /* If we have line number information for the function we are
2457 thinking of stepping into, step into it.
2459 If there are several symtabs at that PC (e.g. with include
2460 files), just want to know whether *any* of them have line
2461 numbers. find_pc_line handles this. */
2463 struct symtab_and_line tmp_sal
;
2465 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2466 if (tmp_sal
.line
!= 0)
2468 step_into_function (ecs
);
2473 /* If we have no line number and the step-stop-if-no-debug is
2474 set, we stop the step so that the user has a chance to switch
2475 in assembly mode. */
2476 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2479 print_stop_reason (END_STEPPING_RANGE
, 0);
2480 stop_stepping (ecs
);
2484 /* Set a breakpoint at callee's return address (the address at
2485 which the caller will resume). */
2486 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2491 /* If we're in the return path from a shared library trampoline,
2492 we want to proceed through the trampoline when stepping. */
2493 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2495 /* Determine where this trampoline returns. */
2496 CORE_ADDR real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2499 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
2501 /* Only proceed through if we know where it's going. */
2504 /* And put the step-breakpoint there and go until there. */
2505 struct symtab_and_line sr_sal
;
2507 init_sal (&sr_sal
); /* initialize to zeroes */
2508 sr_sal
.pc
= real_stop_pc
;
2509 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2511 /* Do not specify what the fp should be when we stop since
2512 on some machines the prologue is where the new fp value
2514 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2516 /* Restart without fiddling with the step ranges or
2523 ecs
->sal
= find_pc_line (stop_pc
, 0);
2525 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2526 the trampoline processing logic, however, there are some trampolines
2527 that have no names, so we should do trampoline handling first. */
2528 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2529 && ecs
->stop_func_name
== NULL
2530 && ecs
->sal
.line
== 0)
2533 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
2535 /* The inferior just stepped into, or returned to, an
2536 undebuggable function (where there is no debugging information
2537 and no line number corresponding to the address where the
2538 inferior stopped). Since we want to skip this kind of code,
2539 we keep going until the inferior returns from this
2540 function - unless the user has asked us not to (via
2541 set step-mode) or we no longer know how to get back
2542 to the call site. */
2543 if (step_stop_if_no_debug
2544 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2546 /* If we have no line number and the step-stop-if-no-debug
2547 is set, we stop the step so that the user has a chance to
2548 switch in assembly mode. */
2550 print_stop_reason (END_STEPPING_RANGE
, 0);
2551 stop_stepping (ecs
);
2556 /* Set a breakpoint at callee's return address (the address
2557 at which the caller will resume). */
2558 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2564 if (step_range_end
== 1)
2566 /* It is stepi or nexti. We always want to stop stepping after
2569 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
2571 print_stop_reason (END_STEPPING_RANGE
, 0);
2572 stop_stepping (ecs
);
2576 if (ecs
->sal
.line
== 0)
2578 /* We have no line number information. That means to stop
2579 stepping (does this always happen right after one instruction,
2580 when we do "s" in a function with no line numbers,
2581 or can this happen as a result of a return or longjmp?). */
2583 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
2585 print_stop_reason (END_STEPPING_RANGE
, 0);
2586 stop_stepping (ecs
);
2590 if ((stop_pc
== ecs
->sal
.pc
)
2591 && (ecs
->current_line
!= ecs
->sal
.line
2592 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2594 /* We are at the start of a different line. So stop. Note that
2595 we don't stop if we step into the middle of a different line.
2596 That is said to make things like for (;;) statements work
2599 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
2601 print_stop_reason (END_STEPPING_RANGE
, 0);
2602 stop_stepping (ecs
);
2606 /* We aren't done stepping.
2608 Optimize by setting the stepping range to the line.
2609 (We might not be in the original line, but if we entered a
2610 new line in mid-statement, we continue stepping. This makes
2611 things like for(;;) statements work better.) */
2613 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2615 /* If this is the last line of the function, don't keep stepping
2616 (it would probably step us out of the function).
2617 This is particularly necessary for a one-line function,
2618 in which after skipping the prologue we better stop even though
2619 we will be in mid-line. */
2621 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different function\n");
2623 print_stop_reason (END_STEPPING_RANGE
, 0);
2624 stop_stepping (ecs
);
2627 step_range_start
= ecs
->sal
.pc
;
2628 step_range_end
= ecs
->sal
.end
;
2629 step_frame_id
= get_frame_id (get_current_frame ());
2630 ecs
->current_line
= ecs
->sal
.line
;
2631 ecs
->current_symtab
= ecs
->sal
.symtab
;
2633 /* In the case where we just stepped out of a function into the
2634 middle of a line of the caller, continue stepping, but
2635 step_frame_id must be modified to current frame */
2637 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2638 generous. It will trigger on things like a step into a frameless
2639 stackless leaf function. I think the logic should instead look
2640 at the unwound frame ID has that should give a more robust
2641 indication of what happened. */
2642 if (step
- ID
== current
- ID
)
2643 still stepping in same function
;
2644 else if (step
- ID
== unwind (current
- ID
))
2645 stepped into a function
;
2647 stepped out of a function
;
2648 /* Of course this assumes that the frame ID unwind code is robust
2649 and we're willing to introduce frame unwind logic into this
2650 function. Fortunately, those days are nearly upon us. */
2653 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2654 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2655 step_frame_id
= current_frame
;
2659 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
2663 /* Are we in the middle of stepping? */
2666 currently_stepping (struct execution_control_state
*ecs
)
2668 return ((!ecs
->handling_longjmp
2669 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2671 || ecs
->stepping_through_solib_after_catch
2672 || bpstat_should_step ());
2675 /* Subroutine call with source code we should not step over. Do step
2676 to the first line of code in it. */
2679 step_into_function (struct execution_control_state
*ecs
)
2682 struct symtab_and_line sr_sal
;
2684 s
= find_pc_symtab (stop_pc
);
2685 if (s
&& s
->language
!= language_asm
)
2686 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2688 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2689 /* Use the step_resume_break to step until the end of the prologue,
2690 even if that involves jumps (as it seems to on the vax under
2692 /* If the prologue ends in the middle of a source line, continue to
2693 the end of that source line (if it is still within the function).
2694 Otherwise, just go to end of prologue. */
2696 && ecs
->sal
.pc
!= ecs
->stop_func_start
2697 && ecs
->sal
.end
< ecs
->stop_func_end
)
2698 ecs
->stop_func_start
= ecs
->sal
.end
;
2700 /* Architectures which require breakpoint adjustment might not be able
2701 to place a breakpoint at the computed address. If so, the test
2702 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2703 ecs->stop_func_start to an address at which a breakpoint may be
2704 legitimately placed.
2706 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2707 made, GDB will enter an infinite loop when stepping through
2708 optimized code consisting of VLIW instructions which contain
2709 subinstructions corresponding to different source lines. On
2710 FR-V, it's not permitted to place a breakpoint on any but the
2711 first subinstruction of a VLIW instruction. When a breakpoint is
2712 set, GDB will adjust the breakpoint address to the beginning of
2713 the VLIW instruction. Thus, we need to make the corresponding
2714 adjustment here when computing the stop address. */
2716 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2718 ecs
->stop_func_start
2719 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2720 ecs
->stop_func_start
);
2723 if (ecs
->stop_func_start
== stop_pc
)
2725 /* We are already there: stop now. */
2727 print_stop_reason (END_STEPPING_RANGE
, 0);
2728 stop_stepping (ecs
);
2733 /* Put the step-breakpoint there and go until there. */
2734 init_sal (&sr_sal
); /* initialize to zeroes */
2735 sr_sal
.pc
= ecs
->stop_func_start
;
2736 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2738 /* Do not specify what the fp should be when we stop since on
2739 some machines the prologue is where the new fp value is
2741 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2743 /* And make sure stepping stops right away then. */
2744 step_range_end
= step_range_start
;
2749 /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID.
2750 This is used to both functions and to skip over code. */
2753 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
2754 struct frame_id sr_id
)
2756 /* There should never be more than one step-resume breakpoint per
2757 thread, so we should never be setting a new
2758 step_resume_breakpoint when one is already active. */
2759 gdb_assert (step_resume_breakpoint
== NULL
);
2760 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
2762 if (breakpoints_inserted
)
2763 insert_breakpoints ();
2766 /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used
2767 to skip a potential signal handler.
2769 This is called with the interrupted function's frame. The signal
2770 handler, when it returns, will resume the interrupted function at
2774 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
2776 struct symtab_and_line sr_sal
;
2778 init_sal (&sr_sal
); /* initialize to zeros */
2780 sr_sal
.pc
= ADDR_BITS_REMOVE (get_frame_pc (return_frame
));
2781 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2783 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
2786 /* Similar to insert_step_resume_breakpoint_at_frame, except
2787 but a breakpoint at the previous frame's PC. This is used to
2788 skip a function after stepping into it (for "next" or if the called
2789 function has no debugging information).
2791 The current function has almost always been reached by single
2792 stepping a call or return instruction. NEXT_FRAME belongs to the
2793 current function, and the breakpoint will be set at the caller's
2796 This is a separate function rather than reusing
2797 insert_step_resume_breakpoint_at_frame in order to avoid
2798 get_prev_frame, which may stop prematurely (see the implementation
2799 of frame_unwind_id for an example). */
2802 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
2804 struct symtab_and_line sr_sal
;
2806 /* We shouldn't have gotten here if we don't know where the call site
2808 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
2810 init_sal (&sr_sal
); /* initialize to zeros */
2812 sr_sal
.pc
= ADDR_BITS_REMOVE (frame_pc_unwind (next_frame
));
2813 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2815 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
2819 stop_stepping (struct execution_control_state
*ecs
)
2822 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
2824 /* Let callers know we don't want to wait for the inferior anymore. */
2825 ecs
->wait_some_more
= 0;
2828 /* This function handles various cases where we need to continue
2829 waiting for the inferior. */
2830 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2833 keep_going (struct execution_control_state
*ecs
)
2835 /* Save the pc before execution, to compare with pc after stop. */
2836 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2838 /* If we did not do break;, it means we should keep running the
2839 inferior and not return to debugger. */
2841 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2843 /* We took a signal (which we are supposed to pass through to
2844 the inferior, else we'd have done a break above) and we
2845 haven't yet gotten our trap. Simply continue. */
2846 resume (currently_stepping (ecs
), stop_signal
);
2850 /* Either the trap was not expected, but we are continuing
2851 anyway (the user asked that this signal be passed to the
2854 The signal was SIGTRAP, e.g. it was our signal, but we
2855 decided we should resume from it.
2857 We're going to run this baby now! */
2859 if (!breakpoints_inserted
&& !ecs
->another_trap
)
2861 breakpoints_failed
= insert_breakpoints ();
2862 if (breakpoints_failed
)
2864 stop_stepping (ecs
);
2867 breakpoints_inserted
= 1;
2870 trap_expected
= ecs
->another_trap
;
2872 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2873 specifies that such a signal should be delivered to the
2876 Typically, this would occure when a user is debugging a
2877 target monitor on a simulator: the target monitor sets a
2878 breakpoint; the simulator encounters this break-point and
2879 halts the simulation handing control to GDB; GDB, noteing
2880 that the break-point isn't valid, returns control back to the
2881 simulator; the simulator then delivers the hardware
2882 equivalent of a SIGNAL_TRAP to the program being debugged. */
2884 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2885 stop_signal
= TARGET_SIGNAL_0
;
2888 resume (currently_stepping (ecs
), stop_signal
);
2891 prepare_to_wait (ecs
);
2894 /* This function normally comes after a resume, before
2895 handle_inferior_event exits. It takes care of any last bits of
2896 housekeeping, and sets the all-important wait_some_more flag. */
2899 prepare_to_wait (struct execution_control_state
*ecs
)
2902 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
2903 if (ecs
->infwait_state
== infwait_normal_state
)
2905 overlay_cache_invalid
= 1;
2907 /* We have to invalidate the registers BEFORE calling
2908 target_wait because they can be loaded from the target while
2909 in target_wait. This makes remote debugging a bit more
2910 efficient for those targets that provide critical registers
2911 as part of their normal status mechanism. */
2913 registers_changed ();
2914 ecs
->waiton_ptid
= pid_to_ptid (-1);
2915 ecs
->wp
= &(ecs
->ws
);
2917 /* This is the old end of the while loop. Let everybody know we
2918 want to wait for the inferior some more and get called again
2920 ecs
->wait_some_more
= 1;
2923 /* Print why the inferior has stopped. We always print something when
2924 the inferior exits, or receives a signal. The rest of the cases are
2925 dealt with later on in normal_stop() and print_it_typical(). Ideally
2926 there should be a call to this function from handle_inferior_event()
2927 each time stop_stepping() is called.*/
2929 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2931 switch (stop_reason
)
2934 /* We don't deal with these cases from handle_inferior_event()
2937 case END_STEPPING_RANGE
:
2938 /* We are done with a step/next/si/ni command. */
2939 /* For now print nothing. */
2940 /* Print a message only if not in the middle of doing a "step n"
2941 operation for n > 1 */
2942 if (!step_multi
|| !stop_step
)
2943 if (ui_out_is_mi_like_p (uiout
))
2946 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
2948 case BREAKPOINT_HIT
:
2949 /* We found a breakpoint. */
2950 /* For now print nothing. */
2953 /* The inferior was terminated by a signal. */
2954 annotate_signalled ();
2955 if (ui_out_is_mi_like_p (uiout
))
2958 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
2959 ui_out_text (uiout
, "\nProgram terminated with signal ");
2960 annotate_signal_name ();
2961 ui_out_field_string (uiout
, "signal-name",
2962 target_signal_to_name (stop_info
));
2963 annotate_signal_name_end ();
2964 ui_out_text (uiout
, ", ");
2965 annotate_signal_string ();
2966 ui_out_field_string (uiout
, "signal-meaning",
2967 target_signal_to_string (stop_info
));
2968 annotate_signal_string_end ();
2969 ui_out_text (uiout
, ".\n");
2970 ui_out_text (uiout
, "The program no longer exists.\n");
2973 /* The inferior program is finished. */
2974 annotate_exited (stop_info
);
2977 if (ui_out_is_mi_like_p (uiout
))
2978 ui_out_field_string (uiout
, "reason",
2979 async_reason_lookup (EXEC_ASYNC_EXITED
));
2980 ui_out_text (uiout
, "\nProgram exited with code ");
2981 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2982 (unsigned int) stop_info
);
2983 ui_out_text (uiout
, ".\n");
2987 if (ui_out_is_mi_like_p (uiout
))
2990 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
2991 ui_out_text (uiout
, "\nProgram exited normally.\n");
2993 /* Support the --return-child-result option. */
2994 return_child_result_value
= stop_info
;
2996 case SIGNAL_RECEIVED
:
2997 /* Signal received. The signal table tells us to print about
3000 ui_out_text (uiout
, "\nProgram received signal ");
3001 annotate_signal_name ();
3002 if (ui_out_is_mi_like_p (uiout
))
3004 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3005 ui_out_field_string (uiout
, "signal-name",
3006 target_signal_to_name (stop_info
));
3007 annotate_signal_name_end ();
3008 ui_out_text (uiout
, ", ");
3009 annotate_signal_string ();
3010 ui_out_field_string (uiout
, "signal-meaning",
3011 target_signal_to_string (stop_info
));
3012 annotate_signal_string_end ();
3013 ui_out_text (uiout
, ".\n");
3016 internal_error (__FILE__
, __LINE__
,
3017 _("print_stop_reason: unrecognized enum value"));
3023 /* Here to return control to GDB when the inferior stops for real.
3024 Print appropriate messages, remove breakpoints, give terminal our modes.
3026 STOP_PRINT_FRAME nonzero means print the executing frame
3027 (pc, function, args, file, line number and line text).
3028 BREAKPOINTS_FAILED nonzero means stop was due to error
3029 attempting to insert breakpoints. */
3034 struct target_waitstatus last
;
3037 get_last_target_status (&last_ptid
, &last
);
3039 /* As with the notification of thread events, we want to delay
3040 notifying the user that we've switched thread context until
3041 the inferior actually stops.
3043 There's no point in saying anything if the inferior has exited.
3044 Note that SIGNALLED here means "exited with a signal", not
3045 "received a signal". */
3046 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3047 && target_has_execution
3048 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3049 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3051 target_terminal_ours_for_output ();
3052 printf_filtered (_("[Switching to %s]\n"),
3053 target_pid_or_tid_to_str (inferior_ptid
));
3054 previous_inferior_ptid
= inferior_ptid
;
3057 /* NOTE drow/2004-01-17: Is this still necessary? */
3058 /* Make sure that the current_frame's pc is correct. This
3059 is a correction for setting up the frame info before doing
3060 DECR_PC_AFTER_BREAK */
3061 if (target_has_execution
)
3062 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3063 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3064 frame code to check for this and sort out any resultant mess.
3065 DECR_PC_AFTER_BREAK needs to just go away. */
3066 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3068 if (target_has_execution
&& breakpoints_inserted
)
3070 if (remove_breakpoints ())
3072 target_terminal_ours_for_output ();
3073 printf_filtered (_("\
3074 Cannot remove breakpoints because program is no longer writable.\n\
3075 It might be running in another process.\n\
3076 Further execution is probably impossible.\n"));
3079 breakpoints_inserted
= 0;
3081 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3082 Delete any breakpoint that is to be deleted at the next stop. */
3084 breakpoint_auto_delete (stop_bpstat
);
3086 /* If an auto-display called a function and that got a signal,
3087 delete that auto-display to avoid an infinite recursion. */
3089 if (stopped_by_random_signal
)
3090 disable_current_display ();
3092 /* Don't print a message if in the middle of doing a "step n"
3093 operation for n > 1 */
3094 if (step_multi
&& stop_step
)
3097 target_terminal_ours ();
3099 /* Set the current source location. This will also happen if we
3100 display the frame below, but the current SAL will be incorrect
3101 during a user hook-stop function. */
3102 if (target_has_stack
&& !stop_stack_dummy
)
3103 set_current_sal_from_frame (get_current_frame (), 1);
3105 /* Look up the hook_stop and run it (CLI internally handles problem
3106 of stop_command's pre-hook not existing). */
3108 catch_errors (hook_stop_stub
, stop_command
,
3109 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3111 if (!target_has_stack
)
3117 /* Select innermost stack frame - i.e., current frame is frame 0,
3118 and current location is based on that.
3119 Don't do this on return from a stack dummy routine,
3120 or if the program has exited. */
3122 if (!stop_stack_dummy
)
3124 select_frame (get_current_frame ());
3126 /* Print current location without a level number, if
3127 we have changed functions or hit a breakpoint.
3128 Print source line if we have one.
3129 bpstat_print() contains the logic deciding in detail
3130 what to print, based on the event(s) that just occurred. */
3132 if (stop_print_frame
&& deprecated_selected_frame
)
3136 int do_frame_printing
= 1;
3138 bpstat_ret
= bpstat_print (stop_bpstat
);
3142 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3143 (or should) carry around the function and does (or
3144 should) use that when doing a frame comparison. */
3146 && frame_id_eq (step_frame_id
,
3147 get_frame_id (get_current_frame ()))
3148 && step_start_function
== find_pc_function (stop_pc
))
3149 source_flag
= SRC_LINE
; /* finished step, just print source line */
3151 source_flag
= SRC_AND_LOC
; /* print location and source line */
3153 case PRINT_SRC_AND_LOC
:
3154 source_flag
= SRC_AND_LOC
; /* print location and source line */
3156 case PRINT_SRC_ONLY
:
3157 source_flag
= SRC_LINE
;
3160 source_flag
= SRC_LINE
; /* something bogus */
3161 do_frame_printing
= 0;
3164 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3166 /* For mi, have the same behavior every time we stop:
3167 print everything but the source line. */
3168 if (ui_out_is_mi_like_p (uiout
))
3169 source_flag
= LOC_AND_ADDRESS
;
3171 if (ui_out_is_mi_like_p (uiout
))
3172 ui_out_field_int (uiout
, "thread-id",
3173 pid_to_thread_id (inferior_ptid
));
3174 /* The behavior of this routine with respect to the source
3176 SRC_LINE: Print only source line
3177 LOCATION: Print only location
3178 SRC_AND_LOC: Print location and source line */
3179 if (do_frame_printing
)
3180 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3182 /* Display the auto-display expressions. */
3187 /* Save the function value return registers, if we care.
3188 We might be about to restore their previous contents. */
3189 if (proceed_to_finish
)
3190 /* NB: The copy goes through to the target picking up the value of
3191 all the registers. */
3192 regcache_cpy (stop_registers
, current_regcache
);
3194 if (stop_stack_dummy
)
3196 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3197 ends with a setting of the current frame, so we can use that
3199 frame_pop (get_current_frame ());
3200 /* Set stop_pc to what it was before we called the function.
3201 Can't rely on restore_inferior_status because that only gets
3202 called if we don't stop in the called function. */
3203 stop_pc
= read_pc ();
3204 select_frame (get_current_frame ());
3208 annotate_stopped ();
3209 observer_notify_normal_stop (stop_bpstat
);
3213 hook_stop_stub (void *cmd
)
3215 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3220 signal_stop_state (int signo
)
3222 return signal_stop
[signo
];
3226 signal_print_state (int signo
)
3228 return signal_print
[signo
];
3232 signal_pass_state (int signo
)
3234 return signal_program
[signo
];
3238 signal_stop_update (int signo
, int state
)
3240 int ret
= signal_stop
[signo
];
3241 signal_stop
[signo
] = state
;
3246 signal_print_update (int signo
, int state
)
3248 int ret
= signal_print
[signo
];
3249 signal_print
[signo
] = state
;
3254 signal_pass_update (int signo
, int state
)
3256 int ret
= signal_program
[signo
];
3257 signal_program
[signo
] = state
;
3262 sig_print_header (void)
3264 printf_filtered (_("\
3265 Signal Stop\tPrint\tPass to program\tDescription\n"));
3269 sig_print_info (enum target_signal oursig
)
3271 char *name
= target_signal_to_name (oursig
);
3272 int name_padding
= 13 - strlen (name
);
3274 if (name_padding
<= 0)
3277 printf_filtered ("%s", name
);
3278 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3279 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3280 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3281 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3282 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3285 /* Specify how various signals in the inferior should be handled. */
3288 handle_command (char *args
, int from_tty
)
3291 int digits
, wordlen
;
3292 int sigfirst
, signum
, siglast
;
3293 enum target_signal oursig
;
3296 unsigned char *sigs
;
3297 struct cleanup
*old_chain
;
3301 error_no_arg (_("signal to handle"));
3304 /* Allocate and zero an array of flags for which signals to handle. */
3306 nsigs
= (int) TARGET_SIGNAL_LAST
;
3307 sigs
= (unsigned char *) alloca (nsigs
);
3308 memset (sigs
, 0, nsigs
);
3310 /* Break the command line up into args. */
3312 argv
= buildargv (args
);
3317 old_chain
= make_cleanup_freeargv (argv
);
3319 /* Walk through the args, looking for signal oursigs, signal names, and
3320 actions. Signal numbers and signal names may be interspersed with
3321 actions, with the actions being performed for all signals cumulatively
3322 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3324 while (*argv
!= NULL
)
3326 wordlen
= strlen (*argv
);
3327 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3331 sigfirst
= siglast
= -1;
3333 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3335 /* Apply action to all signals except those used by the
3336 debugger. Silently skip those. */
3339 siglast
= nsigs
- 1;
3341 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3343 SET_SIGS (nsigs
, sigs
, signal_stop
);
3344 SET_SIGS (nsigs
, sigs
, signal_print
);
3346 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3348 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3350 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3352 SET_SIGS (nsigs
, sigs
, signal_print
);
3354 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3356 SET_SIGS (nsigs
, sigs
, signal_program
);
3358 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3360 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3362 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3364 SET_SIGS (nsigs
, sigs
, signal_program
);
3366 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3368 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3369 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3371 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3373 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3375 else if (digits
> 0)
3377 /* It is numeric. The numeric signal refers to our own
3378 internal signal numbering from target.h, not to host/target
3379 signal number. This is a feature; users really should be
3380 using symbolic names anyway, and the common ones like
3381 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3383 sigfirst
= siglast
= (int)
3384 target_signal_from_command (atoi (*argv
));
3385 if ((*argv
)[digits
] == '-')
3388 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3390 if (sigfirst
> siglast
)
3392 /* Bet he didn't figure we'd think of this case... */
3400 oursig
= target_signal_from_name (*argv
);
3401 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3403 sigfirst
= siglast
= (int) oursig
;
3407 /* Not a number and not a recognized flag word => complain. */
3408 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
3412 /* If any signal numbers or symbol names were found, set flags for
3413 which signals to apply actions to. */
3415 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3417 switch ((enum target_signal
) signum
)
3419 case TARGET_SIGNAL_TRAP
:
3420 case TARGET_SIGNAL_INT
:
3421 if (!allsigs
&& !sigs
[signum
])
3423 if (query ("%s is used by the debugger.\n\
3424 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3430 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3431 gdb_flush (gdb_stdout
);
3435 case TARGET_SIGNAL_0
:
3436 case TARGET_SIGNAL_DEFAULT
:
3437 case TARGET_SIGNAL_UNKNOWN
:
3438 /* Make sure that "all" doesn't print these. */
3449 target_notice_signals (inferior_ptid
);
3453 /* Show the results. */
3454 sig_print_header ();
3455 for (signum
= 0; signum
< nsigs
; signum
++)
3459 sig_print_info (signum
);
3464 do_cleanups (old_chain
);
3468 xdb_handle_command (char *args
, int from_tty
)
3471 struct cleanup
*old_chain
;
3473 /* Break the command line up into args. */
3475 argv
= buildargv (args
);
3480 old_chain
= make_cleanup_freeargv (argv
);
3481 if (argv
[1] != (char *) NULL
)
3486 bufLen
= strlen (argv
[0]) + 20;
3487 argBuf
= (char *) xmalloc (bufLen
);
3491 enum target_signal oursig
;
3493 oursig
= target_signal_from_name (argv
[0]);
3494 memset (argBuf
, 0, bufLen
);
3495 if (strcmp (argv
[1], "Q") == 0)
3496 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3499 if (strcmp (argv
[1], "s") == 0)
3501 if (!signal_stop
[oursig
])
3502 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3504 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3506 else if (strcmp (argv
[1], "i") == 0)
3508 if (!signal_program
[oursig
])
3509 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3511 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3513 else if (strcmp (argv
[1], "r") == 0)
3515 if (!signal_print
[oursig
])
3516 sprintf (argBuf
, "%s %s", argv
[0], "print");
3518 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3524 handle_command (argBuf
, from_tty
);
3526 printf_filtered (_("Invalid signal handling flag.\n"));
3531 do_cleanups (old_chain
);
3534 /* Print current contents of the tables set by the handle command.
3535 It is possible we should just be printing signals actually used
3536 by the current target (but for things to work right when switching
3537 targets, all signals should be in the signal tables). */
3540 signals_info (char *signum_exp
, int from_tty
)
3542 enum target_signal oursig
;
3543 sig_print_header ();
3547 /* First see if this is a symbol name. */
3548 oursig
= target_signal_from_name (signum_exp
);
3549 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3551 /* No, try numeric. */
3553 target_signal_from_command (parse_and_eval_long (signum_exp
));
3555 sig_print_info (oursig
);
3559 printf_filtered ("\n");
3560 /* These ugly casts brought to you by the native VAX compiler. */
3561 for (oursig
= TARGET_SIGNAL_FIRST
;
3562 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3563 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3567 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3568 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3569 sig_print_info (oursig
);
3572 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3575 struct inferior_status
3577 enum target_signal stop_signal
;
3581 int stop_stack_dummy
;
3582 int stopped_by_random_signal
;
3584 CORE_ADDR step_range_start
;
3585 CORE_ADDR step_range_end
;
3586 struct frame_id step_frame_id
;
3587 enum step_over_calls_kind step_over_calls
;
3588 CORE_ADDR step_resume_break_address
;
3589 int stop_after_trap
;
3591 struct regcache
*stop_registers
;
3593 /* These are here because if call_function_by_hand has written some
3594 registers and then decides to call error(), we better not have changed
3596 struct regcache
*registers
;
3598 /* A frame unique identifier. */
3599 struct frame_id selected_frame_id
;
3601 int breakpoint_proceeded
;
3602 int restore_stack_info
;
3603 int proceed_to_finish
;
3607 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3610 int size
= register_size (current_gdbarch
, regno
);
3611 void *buf
= alloca (size
);
3612 store_signed_integer (buf
, size
, val
);
3613 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3616 /* Save all of the information associated with the inferior<==>gdb
3617 connection. INF_STATUS is a pointer to a "struct inferior_status"
3618 (defined in inferior.h). */
3620 struct inferior_status
*
3621 save_inferior_status (int restore_stack_info
)
3623 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3625 inf_status
->stop_signal
= stop_signal
;
3626 inf_status
->stop_pc
= stop_pc
;
3627 inf_status
->stop_step
= stop_step
;
3628 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3629 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3630 inf_status
->trap_expected
= trap_expected
;
3631 inf_status
->step_range_start
= step_range_start
;
3632 inf_status
->step_range_end
= step_range_end
;
3633 inf_status
->step_frame_id
= step_frame_id
;
3634 inf_status
->step_over_calls
= step_over_calls
;
3635 inf_status
->stop_after_trap
= stop_after_trap
;
3636 inf_status
->stop_soon
= stop_soon
;
3637 /* Save original bpstat chain here; replace it with copy of chain.
3638 If caller's caller is walking the chain, they'll be happier if we
3639 hand them back the original chain when restore_inferior_status is
3641 inf_status
->stop_bpstat
= stop_bpstat
;
3642 stop_bpstat
= bpstat_copy (stop_bpstat
);
3643 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3644 inf_status
->restore_stack_info
= restore_stack_info
;
3645 inf_status
->proceed_to_finish
= proceed_to_finish
;
3647 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3649 inf_status
->registers
= regcache_dup (current_regcache
);
3651 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3656 restore_selected_frame (void *args
)
3658 struct frame_id
*fid
= (struct frame_id
*) args
;
3659 struct frame_info
*frame
;
3661 frame
= frame_find_by_id (*fid
);
3663 /* If inf_status->selected_frame_id is NULL, there was no previously
3667 warning (_("Unable to restore previously selected frame."));
3671 select_frame (frame
);
3677 restore_inferior_status (struct inferior_status
*inf_status
)
3679 stop_signal
= inf_status
->stop_signal
;
3680 stop_pc
= inf_status
->stop_pc
;
3681 stop_step
= inf_status
->stop_step
;
3682 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3683 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3684 trap_expected
= inf_status
->trap_expected
;
3685 step_range_start
= inf_status
->step_range_start
;
3686 step_range_end
= inf_status
->step_range_end
;
3687 step_frame_id
= inf_status
->step_frame_id
;
3688 step_over_calls
= inf_status
->step_over_calls
;
3689 stop_after_trap
= inf_status
->stop_after_trap
;
3690 stop_soon
= inf_status
->stop_soon
;
3691 bpstat_clear (&stop_bpstat
);
3692 stop_bpstat
= inf_status
->stop_bpstat
;
3693 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3694 proceed_to_finish
= inf_status
->proceed_to_finish
;
3696 /* FIXME: Is the restore of stop_registers always needed. */
3697 regcache_xfree (stop_registers
);
3698 stop_registers
= inf_status
->stop_registers
;
3700 /* The inferior can be gone if the user types "print exit(0)"
3701 (and perhaps other times). */
3702 if (target_has_execution
)
3703 /* NB: The register write goes through to the target. */
3704 regcache_cpy (current_regcache
, inf_status
->registers
);
3705 regcache_xfree (inf_status
->registers
);
3707 /* FIXME: If we are being called after stopping in a function which
3708 is called from gdb, we should not be trying to restore the
3709 selected frame; it just prints a spurious error message (The
3710 message is useful, however, in detecting bugs in gdb (like if gdb
3711 clobbers the stack)). In fact, should we be restoring the
3712 inferior status at all in that case? . */
3714 if (target_has_stack
&& inf_status
->restore_stack_info
)
3716 /* The point of catch_errors is that if the stack is clobbered,
3717 walking the stack might encounter a garbage pointer and
3718 error() trying to dereference it. */
3720 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3721 "Unable to restore previously selected frame:\n",
3722 RETURN_MASK_ERROR
) == 0)
3723 /* Error in restoring the selected frame. Select the innermost
3725 select_frame (get_current_frame ());
3733 do_restore_inferior_status_cleanup (void *sts
)
3735 restore_inferior_status (sts
);
3739 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3741 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3745 discard_inferior_status (struct inferior_status
*inf_status
)
3747 /* See save_inferior_status for info on stop_bpstat. */
3748 bpstat_clear (&inf_status
->stop_bpstat
);
3749 regcache_xfree (inf_status
->registers
);
3750 regcache_xfree (inf_status
->stop_registers
);
3755 inferior_has_forked (int pid
, int *child_pid
)
3757 struct target_waitstatus last
;
3760 get_last_target_status (&last_ptid
, &last
);
3762 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3765 if (ptid_get_pid (last_ptid
) != pid
)
3768 *child_pid
= last
.value
.related_pid
;
3773 inferior_has_vforked (int pid
, int *child_pid
)
3775 struct target_waitstatus last
;
3778 get_last_target_status (&last_ptid
, &last
);
3780 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3783 if (ptid_get_pid (last_ptid
) != pid
)
3786 *child_pid
= last
.value
.related_pid
;
3791 inferior_has_execd (int pid
, char **execd_pathname
)
3793 struct target_waitstatus last
;
3796 get_last_target_status (&last_ptid
, &last
);
3798 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3801 if (ptid_get_pid (last_ptid
) != pid
)
3804 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3808 /* Oft used ptids */
3810 ptid_t minus_one_ptid
;
3812 /* Create a ptid given the necessary PID, LWP, and TID components. */
3815 ptid_build (int pid
, long lwp
, long tid
)
3825 /* Create a ptid from just a pid. */
3828 pid_to_ptid (int pid
)
3830 return ptid_build (pid
, 0, 0);
3833 /* Fetch the pid (process id) component from a ptid. */
3836 ptid_get_pid (ptid_t ptid
)
3841 /* Fetch the lwp (lightweight process) component from a ptid. */
3844 ptid_get_lwp (ptid_t ptid
)
3849 /* Fetch the tid (thread id) component from a ptid. */
3852 ptid_get_tid (ptid_t ptid
)
3857 /* ptid_equal() is used to test equality of two ptids. */
3860 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3862 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3863 && ptid1
.tid
== ptid2
.tid
);
3866 /* restore_inferior_ptid() will be used by the cleanup machinery
3867 to restore the inferior_ptid value saved in a call to
3868 save_inferior_ptid(). */
3871 restore_inferior_ptid (void *arg
)
3873 ptid_t
*saved_ptid_ptr
= arg
;
3874 inferior_ptid
= *saved_ptid_ptr
;
3878 /* Save the value of inferior_ptid so that it may be restored by a
3879 later call to do_cleanups(). Returns the struct cleanup pointer
3880 needed for later doing the cleanup. */
3883 save_inferior_ptid (void)
3885 ptid_t
*saved_ptid_ptr
;
3887 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3888 *saved_ptid_ptr
= inferior_ptid
;
3889 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3896 stop_registers
= regcache_xmalloc (current_gdbarch
);
3900 _initialize_infrun (void)
3904 struct cmd_list_element
*c
;
3906 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers
);
3907 deprecated_register_gdbarch_swap (NULL
, 0, build_infrun
);
3909 add_info ("signals", signals_info
, _("\
3910 What debugger does when program gets various signals.\n\
3911 Specify a signal as argument to print info on that signal only."));
3912 add_info_alias ("handle", "signals", 0);
3914 add_com ("handle", class_run
, handle_command
, _("\
3915 Specify how to handle a signal.\n\
3916 Args are signals and actions to apply to those signals.\n\
3917 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3918 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3919 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3920 The special arg \"all\" is recognized to mean all signals except those\n\
3921 used by the debugger, typically SIGTRAP and SIGINT.\n\
3922 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3923 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3924 Stop means reenter debugger if this signal happens (implies print).\n\
3925 Print means print a message if this signal happens.\n\
3926 Pass means let program see this signal; otherwise program doesn't know.\n\
3927 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3928 Pass and Stop may be combined."));
3931 add_com ("lz", class_info
, signals_info
, _("\
3932 What debugger does when program gets various signals.\n\
3933 Specify a signal as argument to print info on that signal only."));
3934 add_com ("z", class_run
, xdb_handle_command
, _("\
3935 Specify how to handle a signal.\n\
3936 Args are signals and actions to apply to those signals.\n\
3937 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3938 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3939 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3940 The special arg \"all\" is recognized to mean all signals except those\n\
3941 used by the debugger, typically SIGTRAP and SIGINT.\n\
3942 Recognized actions include \"s\" (toggles between stop and nostop), \n\
3943 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3944 nopass), \"Q\" (noprint)\n\
3945 Stop means reenter debugger if this signal happens (implies print).\n\
3946 Print means print a message if this signal happens.\n\
3947 Pass means let program see this signal; otherwise program doesn't know.\n\
3948 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3949 Pass and Stop may be combined."));
3953 stop_command
= add_cmd ("stop", class_obscure
,
3954 not_just_help_class_command
, _("\
3955 There is no `stop' command, but you can set a hook on `stop'.\n\
3956 This allows you to set a list of commands to be run each time execution\n\
3957 of the program stops."), &cmdlist
);
3959 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
3960 Set inferior debugging."), _("\
3961 Show inferior debugging."), _("\
3962 When non-zero, inferior specific debugging is enabled."),
3965 &setdebuglist
, &showdebuglist
);
3967 numsigs
= (int) TARGET_SIGNAL_LAST
;
3968 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3969 signal_print
= (unsigned char *)
3970 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3971 signal_program
= (unsigned char *)
3972 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3973 for (i
= 0; i
< numsigs
; i
++)
3976 signal_print
[i
] = 1;
3977 signal_program
[i
] = 1;
3980 /* Signals caused by debugger's own actions
3981 should not be given to the program afterwards. */
3982 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3983 signal_program
[TARGET_SIGNAL_INT
] = 0;
3985 /* Signals that are not errors should not normally enter the debugger. */
3986 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3987 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3988 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3989 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3990 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3991 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3992 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3993 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3994 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3995 signal_print
[TARGET_SIGNAL_IO
] = 0;
3996 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3997 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3998 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3999 signal_print
[TARGET_SIGNAL_URG
] = 0;
4000 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4001 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4003 /* These signals are used internally by user-level thread
4004 implementations. (See signal(5) on Solaris.) Like the above
4005 signals, a healthy program receives and handles them as part of
4006 its normal operation. */
4007 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4008 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4009 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4010 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4011 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4012 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4014 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
4015 &stop_on_solib_events
, _("\
4016 Set stopping for shared library events."), _("\
4017 Show stopping for shared library events."), _("\
4018 If nonzero, gdb will give control to the user when the dynamic linker\n\
4019 notifies gdb of shared library events. The most common event of interest\n\
4020 to the user would be loading/unloading of a new library."),
4022 show_stop_on_solib_events
,
4023 &setlist
, &showlist
);
4025 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
4026 follow_fork_mode_kind_names
,
4027 &follow_fork_mode_string
, _("\
4028 Set debugger response to a program call of fork or vfork."), _("\
4029 Show debugger response to a program call of fork or vfork."), _("\
4030 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4031 parent - the original process is debugged after a fork\n\
4032 child - the new process is debugged after a fork\n\
4033 The unfollowed process will continue to run.\n\
4034 By default, the debugger will follow the parent process."),
4036 show_follow_fork_mode_string
,
4037 &setlist
, &showlist
);
4039 add_setshow_enum_cmd ("scheduler-locking", class_run
,
4040 scheduler_enums
, &scheduler_mode
, _("\
4041 Set mode for locking scheduler during execution."), _("\
4042 Show mode for locking scheduler during execution."), _("\
4043 off == no locking (threads may preempt at any time)\n\
4044 on == full locking (no thread except the current thread may run)\n\
4045 step == scheduler locked during every single-step operation.\n\
4046 In this mode, no other thread may run during a step command.\n\
4047 Other threads may run while stepping over a function call ('next')."),
4048 set_schedlock_func
, /* traps on target vector */
4049 show_scheduler_mode
,
4050 &setlist
, &showlist
);
4052 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
4053 Set mode of the step operation."), _("\
4054 Show mode of the step operation."), _("\
4055 When set, doing a step over a function without debug line information\n\
4056 will stop at the first instruction of that function. Otherwise, the\n\
4057 function is skipped and the step command stops at a different source line."),
4059 show_step_stop_if_no_debug
,
4060 &setlist
, &showlist
);
4062 /* ptid initializations */
4063 null_ptid
= ptid_build (0, 0, 0);
4064 minus_one_ptid
= ptid_build (-1, 0, 0);
4065 inferior_ptid
= null_ptid
;
4066 target_last_wait_ptid
= minus_one_ptid
;