1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
6 Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
31 #include "exceptions.h"
32 #include "breakpoint.h"
36 #include "cli/cli-script.h"
38 #include "gdbthread.h"
48 #include "gdb_assert.h"
50 /* Prototypes for local functions */
52 static void signals_info (char *, int);
54 static void handle_command (char *, int);
56 static void sig_print_info (enum target_signal
);
58 static void sig_print_header (void);
60 static void resume_cleanups (void *);
62 static int hook_stop_stub (void *);
64 static int restore_selected_frame (void *);
66 static void build_infrun (void);
68 static int follow_fork (void);
70 static void set_schedlock_func (char *args
, int from_tty
,
71 struct cmd_list_element
*c
);
73 struct execution_control_state
;
75 static int currently_stepping (struct execution_control_state
*ecs
);
77 static void xdb_handle_command (char *args
, int from_tty
);
79 static int prepare_to_proceed (void);
81 void _initialize_infrun (void);
83 int inferior_ignoring_startup_exec_events
= 0;
84 int inferior_ignoring_leading_exec_events
= 0;
86 /* When set, stop the 'step' command if we enter a function which has
87 no line number information. The normal behavior is that we step
88 over such function. */
89 int step_stop_if_no_debug
= 0;
91 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
92 struct cmd_list_element
*c
, const char *value
)
94 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
97 /* In asynchronous mode, but simulating synchronous execution. */
99 int sync_execution
= 0;
101 /* wait_for_inferior and normal_stop use this to notify the user
102 when the inferior stopped in a different thread than it had been
105 static ptid_t previous_inferior_ptid
;
107 /* This is true for configurations that may follow through execl() and
108 similar functions. At present this is only true for HP-UX native. */
110 #ifndef MAY_FOLLOW_EXEC
111 #define MAY_FOLLOW_EXEC (0)
114 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
116 static int debug_infrun
= 0;
118 show_debug_infrun (struct ui_file
*file
, int from_tty
,
119 struct cmd_list_element
*c
, const char *value
)
121 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
124 /* If the program uses ELF-style shared libraries, then calls to
125 functions in shared libraries go through stubs, which live in a
126 table called the PLT (Procedure Linkage Table). The first time the
127 function is called, the stub sends control to the dynamic linker,
128 which looks up the function's real address, patches the stub so
129 that future calls will go directly to the function, and then passes
130 control to the function.
132 If we are stepping at the source level, we don't want to see any of
133 this --- we just want to skip over the stub and the dynamic linker.
134 The simple approach is to single-step until control leaves the
137 However, on some systems (e.g., Red Hat's 5.2 distribution) the
138 dynamic linker calls functions in the shared C library, so you
139 can't tell from the PC alone whether the dynamic linker is still
140 running. In this case, we use a step-resume breakpoint to get us
141 past the dynamic linker, as if we were using "next" to step over a
144 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
145 linker code or not. Normally, this means we single-step. However,
146 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
147 address where we can place a step-resume breakpoint to get past the
148 linker's symbol resolution function.
150 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
151 pretty portable way, by comparing the PC against the address ranges
152 of the dynamic linker's sections.
154 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
155 it depends on internal details of the dynamic linker. It's usually
156 not too hard to figure out where to put a breakpoint, but it
157 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
158 sanity checking. If it can't figure things out, returning zero and
159 getting the (possibly confusing) stepping behavior is better than
160 signalling an error, which will obscure the change in the
163 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
164 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
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
;
257 /* Nonzero if we want to give control to the user when we're notified
258 of shared library events by the dynamic linker. */
259 static int stop_on_solib_events
;
261 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
262 struct cmd_list_element
*c
, const char *value
)
264 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
269 /* Nonzero means expecting a trace trap
270 and should stop the inferior and return silently when it happens. */
274 /* Nonzero means expecting a trap and caller will handle it themselves.
275 It is used after attach, due to attaching to a process;
276 when running in the shell before the child program has been exec'd;
277 and when running some kinds of remote stuff (FIXME?). */
279 enum stop_kind stop_soon
;
281 /* Nonzero if proceed is being used for a "finish" command or a similar
282 situation when stop_registers should be saved. */
284 int proceed_to_finish
;
286 /* Save register contents here when about to pop a stack dummy frame,
287 if-and-only-if proceed_to_finish is set.
288 Thus this contains the return value from the called function (assuming
289 values are returned in a register). */
291 struct regcache
*stop_registers
;
293 /* Nonzero if program stopped due to error trying to insert breakpoints. */
295 static int breakpoints_failed
;
297 /* Nonzero after stop if current stack frame should be printed. */
299 static int stop_print_frame
;
301 static struct breakpoint
*step_resume_breakpoint
= NULL
;
303 /* This is a cached copy of the pid/waitstatus of the last event
304 returned by target_wait()/deprecated_target_wait_hook(). This
305 information is returned by get_last_target_status(). */
306 static ptid_t target_last_wait_ptid
;
307 static struct target_waitstatus target_last_waitstatus
;
309 /* This is used to remember when a fork, vfork or exec event
310 was caught by a catchpoint, and thus the event is to be
311 followed at the next resume of the inferior, and not
315 enum target_waitkind kind
;
322 char *execd_pathname
;
326 static const char follow_fork_mode_child
[] = "child";
327 static const char follow_fork_mode_parent
[] = "parent";
329 static const char *follow_fork_mode_kind_names
[] = {
330 follow_fork_mode_child
,
331 follow_fork_mode_parent
,
335 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
337 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
338 struct cmd_list_element
*c
, const char *value
)
340 fprintf_filtered (file
, _("\
341 Debugger response to a program call of fork or vfork is \"%s\".\n"),
349 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
351 return target_follow_fork (follow_child
);
355 follow_inferior_reset_breakpoints (void)
357 /* Was there a step_resume breakpoint? (There was if the user
358 did a "next" at the fork() call.) If so, explicitly reset its
361 step_resumes are a form of bp that are made to be per-thread.
362 Since we created the step_resume bp when the parent process
363 was being debugged, and now are switching to the child process,
364 from the breakpoint package's viewpoint, that's a switch of
365 "threads". We must update the bp's notion of which thread
366 it is for, or it'll be ignored when it triggers. */
368 if (step_resume_breakpoint
)
369 breakpoint_re_set_thread (step_resume_breakpoint
);
371 /* Reinsert all breakpoints in the child. The user may have set
372 breakpoints after catching the fork, in which case those
373 were never set in the child, but only in the parent. This makes
374 sure the inserted breakpoints match the breakpoint list. */
376 breakpoint_re_set ();
377 insert_breakpoints ();
380 /* EXECD_PATHNAME is assumed to be non-NULL. */
383 follow_exec (int pid
, char *execd_pathname
)
386 struct target_ops
*tgt
;
388 if (!may_follow_exec
)
391 /* This is an exec event that we actually wish to pay attention to.
392 Refresh our symbol table to the newly exec'd program, remove any
395 If there are breakpoints, they aren't really inserted now,
396 since the exec() transformed our inferior into a fresh set
399 We want to preserve symbolic breakpoints on the list, since
400 we have hopes that they can be reset after the new a.out's
401 symbol table is read.
403 However, any "raw" breakpoints must be removed from the list
404 (e.g., the solib bp's), since their address is probably invalid
407 And, we DON'T want to call delete_breakpoints() here, since
408 that may write the bp's "shadow contents" (the instruction
409 value that was overwritten witha TRAP instruction). Since
410 we now have a new a.out, those shadow contents aren't valid. */
411 update_breakpoints_after_exec ();
413 /* If there was one, it's gone now. We cannot truly step-to-next
414 statement through an exec(). */
415 step_resume_breakpoint
= NULL
;
416 step_range_start
= 0;
419 /* What is this a.out's name? */
420 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
422 /* We've followed the inferior through an exec. Therefore, the
423 inferior has essentially been killed & reborn. */
425 /* First collect the run target in effect. */
426 tgt
= find_run_target ();
427 /* If we can't find one, things are in a very strange state... */
429 error (_("Could find run target to save before following exec"));
431 gdb_flush (gdb_stdout
);
432 target_mourn_inferior ();
433 inferior_ptid
= pid_to_ptid (saved_pid
);
434 /* Because mourn_inferior resets inferior_ptid. */
437 /* That a.out is now the one to use. */
438 exec_file_attach (execd_pathname
, 0);
440 /* And also is where symbols can be found. */
441 symbol_file_add_main (execd_pathname
, 0);
443 /* Reset the shared library package. This ensures that we get
444 a shlib event when the child reaches "_start", at which point
445 the dld will have had a chance to initialize the child. */
446 #if defined(SOLIB_RESTART)
449 #ifdef SOLIB_CREATE_INFERIOR_HOOK
450 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
453 /* Reinsert all breakpoints. (Those which were symbolic have
454 been reset to the proper address in the new a.out, thanks
455 to symbol_file_command...) */
456 insert_breakpoints ();
458 /* The next resume of this inferior should bring it to the shlib
459 startup breakpoints. (If the user had also set bp's on
460 "main" from the old (parent) process, then they'll auto-
461 matically get reset there in the new process.) */
464 /* Non-zero if we just simulating a single-step. This is needed
465 because we cannot remove the breakpoints in the inferior process
466 until after the `wait' in `wait_for_inferior'. */
467 static int singlestep_breakpoints_inserted_p
= 0;
469 /* The thread we inserted single-step breakpoints for. */
470 static ptid_t singlestep_ptid
;
472 /* If another thread hit the singlestep breakpoint, we save the original
473 thread here so that we can resume single-stepping it later. */
474 static ptid_t saved_singlestep_ptid
;
475 static int stepping_past_singlestep_breakpoint
;
478 /* Things to clean up if we QUIT out of resume (). */
480 resume_cleanups (void *ignore
)
485 static const char schedlock_off
[] = "off";
486 static const char schedlock_on
[] = "on";
487 static const char schedlock_step
[] = "step";
488 static const char *scheduler_enums
[] = {
494 static const char *scheduler_mode
= schedlock_off
;
496 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
497 struct cmd_list_element
*c
, const char *value
)
499 fprintf_filtered (file
, _("\
500 Mode for locking scheduler during execution is \"%s\".\n"),
505 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
507 if (!target_can_lock_scheduler
)
509 scheduler_mode
= schedlock_off
;
510 error (_("Target '%s' cannot support this command."), target_shortname
);
515 /* Resume the inferior, but allow a QUIT. This is useful if the user
516 wants to interrupt some lengthy single-stepping operation
517 (for child processes, the SIGINT goes to the inferior, and so
518 we get a SIGINT random_signal, but for remote debugging and perhaps
519 other targets, that's not true).
521 STEP nonzero if we should step (zero to continue instead).
522 SIG is the signal to give the inferior (zero for none). */
524 resume (int step
, enum target_signal sig
)
526 int should_resume
= 1;
527 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
531 fprintf_unfiltered (gdb_stdlog
, "infrun: resume (step=%d, signal=%d)\n",
534 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
537 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
538 over an instruction that causes a page fault without triggering
539 a hardware watchpoint. The kernel properly notices that it shouldn't
540 stop, because the hardware watchpoint is not triggered, but it forgets
541 the step request and continues the program normally.
542 Work around the problem by removing hardware watchpoints if a step is
543 requested, GDB will check for a hardware watchpoint trigger after the
545 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
546 remove_hw_watchpoints ();
549 /* Normally, by the time we reach `resume', the breakpoints are either
550 removed or inserted, as appropriate. The exception is if we're sitting
551 at a permanent breakpoint; we need to step over it, but permanent
552 breakpoints can't be removed. So we have to test for it here. */
553 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
554 SKIP_PERMANENT_BREAKPOINT ();
556 if (SOFTWARE_SINGLE_STEP_P () && step
)
558 /* Do it the hard way, w/temp breakpoints */
559 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
560 /* ...and don't ask hardware to do it. */
562 /* and do not pull these breakpoints until after a `wait' in
563 `wait_for_inferior' */
564 singlestep_breakpoints_inserted_p
= 1;
565 singlestep_ptid
= inferior_ptid
;
568 /* If there were any forks/vforks/execs that were caught and are
569 now to be followed, then do so. */
570 switch (pending_follow
.kind
)
572 case TARGET_WAITKIND_FORKED
:
573 case TARGET_WAITKIND_VFORKED
:
574 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
579 case TARGET_WAITKIND_EXECD
:
580 /* follow_exec is called as soon as the exec event is seen. */
581 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
588 /* Install inferior's terminal modes. */
589 target_terminal_inferior ();
595 resume_ptid
= RESUME_ALL
; /* Default */
597 if ((step
|| singlestep_breakpoints_inserted_p
)
598 && (stepping_past_singlestep_breakpoint
599 || (!breakpoints_inserted
&& breakpoint_here_p (read_pc ()))))
601 /* Stepping past a breakpoint without inserting breakpoints.
602 Make sure only the current thread gets to step, so that
603 other threads don't sneak past breakpoints while they are
606 resume_ptid
= inferior_ptid
;
609 if ((scheduler_mode
== schedlock_on
)
610 || (scheduler_mode
== schedlock_step
611 && (step
|| singlestep_breakpoints_inserted_p
)))
613 /* User-settable 'scheduler' mode requires solo thread resume. */
614 resume_ptid
= inferior_ptid
;
617 if (CANNOT_STEP_BREAKPOINT
)
619 /* Most targets can step a breakpoint instruction, thus
620 executing it normally. But if this one cannot, just
621 continue and we will hit it anyway. */
622 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
625 target_resume (resume_ptid
, step
, sig
);
628 discard_cleanups (old_cleanups
);
632 /* Clear out all variables saying what to do when inferior is continued.
633 First do this, then set the ones you want, then call `proceed'. */
636 clear_proceed_status (void)
639 step_range_start
= 0;
641 step_frame_id
= null_frame_id
;
642 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
644 stop_soon
= NO_STOP_QUIETLY
;
645 proceed_to_finish
= 0;
646 breakpoint_proceeded
= 1; /* We're about to proceed... */
648 /* Discard any remaining commands or status from previous stop. */
649 bpstat_clear (&stop_bpstat
);
652 /* This should be suitable for any targets that support threads. */
655 prepare_to_proceed (void)
658 struct target_waitstatus wait_status
;
660 /* Get the last target status returned by target_wait(). */
661 get_last_target_status (&wait_ptid
, &wait_status
);
663 /* Make sure we were stopped either at a breakpoint, or because
665 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
666 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
667 && wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
672 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
673 && !ptid_equal (inferior_ptid
, wait_ptid
))
675 /* Switched over from WAIT_PID. */
676 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
678 if (wait_pc
!= read_pc ())
680 /* Switch back to WAIT_PID thread. */
681 inferior_ptid
= wait_ptid
;
683 /* FIXME: This stuff came from switch_to_thread() in
684 thread.c (which should probably be a public function). */
685 flush_cached_frames ();
686 registers_changed ();
688 select_frame (get_current_frame ());
691 /* We return 1 to indicate that there is a breakpoint here,
692 so we need to step over it before continuing to avoid
693 hitting it straight away. */
694 if (breakpoint_here_p (wait_pc
))
702 /* Record the pc of the program the last time it stopped. This is
703 just used internally by wait_for_inferior, but need to be preserved
704 over calls to it and cleared when the inferior is started. */
705 static CORE_ADDR prev_pc
;
707 /* Basic routine for continuing the program in various fashions.
709 ADDR is the address to resume at, or -1 for resume where stopped.
710 SIGGNAL is the signal to give it, or 0 for none,
711 or -1 for act according to how it stopped.
712 STEP is nonzero if should trap after one instruction.
713 -1 means return after that and print nothing.
714 You should probably set various step_... variables
715 before calling here, if you are stepping.
717 You should call clear_proceed_status before calling proceed. */
720 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
725 step_start_function
= find_pc_function (read_pc ());
729 if (addr
== (CORE_ADDR
) -1)
731 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
732 /* There is a breakpoint at the address we will resume at,
733 step one instruction before inserting breakpoints so that
734 we do not stop right away (and report a second hit at this
737 else if (gdbarch_single_step_through_delay_p (current_gdbarch
)
738 && gdbarch_single_step_through_delay (current_gdbarch
,
739 get_current_frame ()))
740 /* We stepped onto an instruction that needs to be stepped
741 again before re-inserting the breakpoint, do so. */
750 fprintf_unfiltered (gdb_stdlog
,
751 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
752 paddr_nz (addr
), siggnal
, step
);
754 /* In a multi-threaded task we may select another thread
755 and then continue or step.
757 But if the old thread was stopped at a breakpoint, it
758 will immediately cause another breakpoint stop without
759 any execution (i.e. it will report a breakpoint hit
760 incorrectly). So we must step over it first.
762 prepare_to_proceed checks the current thread against the thread
763 that reported the most recent event. If a step-over is required
764 it returns TRUE and sets the current thread to the old thread. */
765 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
769 /* We will get a trace trap after one instruction.
770 Continue it automatically and insert breakpoints then. */
774 insert_breakpoints ();
775 /* If we get here there was no call to error() in
776 insert breakpoints -- so they were inserted. */
777 breakpoints_inserted
= 1;
780 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
781 stop_signal
= siggnal
;
782 /* If this signal should not be seen by program,
783 give it zero. Used for debugging signals. */
784 else if (!signal_program
[stop_signal
])
785 stop_signal
= TARGET_SIGNAL_0
;
787 annotate_starting ();
789 /* Make sure that output from GDB appears before output from the
791 gdb_flush (gdb_stdout
);
793 /* Refresh prev_pc value just prior to resuming. This used to be
794 done in stop_stepping, however, setting prev_pc there did not handle
795 scenarios such as inferior function calls or returning from
796 a function via the return command. In those cases, the prev_pc
797 value was not set properly for subsequent commands. The prev_pc value
798 is used to initialize the starting line number in the ecs. With an
799 invalid value, the gdb next command ends up stopping at the position
800 represented by the next line table entry past our start position.
801 On platforms that generate one line table entry per line, this
802 is not a problem. However, on the ia64, the compiler generates
803 extraneous line table entries that do not increase the line number.
804 When we issue the gdb next command on the ia64 after an inferior call
805 or a return command, we often end up a few instructions forward, still
806 within the original line we started.
808 An attempt was made to have init_execution_control_state () refresh
809 the prev_pc value before calculating the line number. This approach
810 did not work because on platforms that use ptrace, the pc register
811 cannot be read unless the inferior is stopped. At that point, we
812 are not guaranteed the inferior is stopped and so the read_pc ()
813 call can fail. Setting the prev_pc value here ensures the value is
814 updated correctly when the inferior is stopped. */
815 prev_pc
= read_pc ();
817 /* Resume inferior. */
818 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
820 /* Wait for it to stop (if not standalone)
821 and in any case decode why it stopped, and act accordingly. */
822 /* Do this only if we are not using the event loop, or if the target
823 does not support asynchronous execution. */
824 if (!target_can_async_p ())
826 wait_for_inferior ();
832 /* Start remote-debugging of a machine over a serial link. */
838 init_wait_for_inferior ();
839 stop_soon
= STOP_QUIETLY
;
842 /* Always go on waiting for the target, regardless of the mode. */
843 /* FIXME: cagney/1999-09-23: At present it isn't possible to
844 indicate to wait_for_inferior that a target should timeout if
845 nothing is returned (instead of just blocking). Because of this,
846 targets expecting an immediate response need to, internally, set
847 things up so that the target_wait() is forced to eventually
849 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
850 differentiate to its caller what the state of the target is after
851 the initial open has been performed. Here we're assuming that
852 the target has stopped. It should be possible to eventually have
853 target_open() return to the caller an indication that the target
854 is currently running and GDB state should be set to the same as
856 wait_for_inferior ();
860 /* Initialize static vars when a new inferior begins. */
863 init_wait_for_inferior (void)
865 /* These are meaningless until the first time through wait_for_inferior. */
868 breakpoints_inserted
= 0;
869 breakpoint_init_inferior (inf_starting
);
871 /* Don't confuse first call to proceed(). */
872 stop_signal
= TARGET_SIGNAL_0
;
874 /* The first resume is not following a fork/vfork/exec. */
875 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
877 clear_proceed_status ();
879 stepping_past_singlestep_breakpoint
= 0;
882 /* This enum encodes possible reasons for doing a target_wait, so that
883 wfi can call target_wait in one place. (Ultimately the call will be
884 moved out of the infinite loop entirely.) */
888 infwait_normal_state
,
889 infwait_thread_hop_state
,
890 infwait_nonstep_watch_state
893 /* Why did the inferior stop? Used to print the appropriate messages
894 to the interface from within handle_inferior_event(). */
895 enum inferior_stop_reason
897 /* We don't know why. */
899 /* Step, next, nexti, stepi finished. */
901 /* Found breakpoint. */
903 /* Inferior terminated by signal. */
905 /* Inferior exited. */
907 /* Inferior received signal, and user asked to be notified. */
911 /* This structure contains what used to be local variables in
912 wait_for_inferior. Probably many of them can return to being
913 locals in handle_inferior_event. */
915 struct execution_control_state
917 struct target_waitstatus ws
;
918 struct target_waitstatus
*wp
;
921 CORE_ADDR stop_func_start
;
922 CORE_ADDR stop_func_end
;
923 char *stop_func_name
;
924 struct symtab_and_line sal
;
926 struct symtab
*current_symtab
;
927 int handling_longjmp
; /* FIXME */
929 ptid_t saved_inferior_ptid
;
930 int step_after_step_resume_breakpoint
;
931 int stepping_through_solib_after_catch
;
932 bpstat stepping_through_solib_catchpoints
;
933 int new_thread_event
;
934 struct target_waitstatus tmpstatus
;
935 enum infwait_states infwait_state
;
940 void init_execution_control_state (struct execution_control_state
*ecs
);
942 void handle_inferior_event (struct execution_control_state
*ecs
);
944 static void step_into_function (struct execution_control_state
*ecs
);
945 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
946 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
947 struct frame_id sr_id
);
948 static void stop_stepping (struct execution_control_state
*ecs
);
949 static void prepare_to_wait (struct execution_control_state
*ecs
);
950 static void keep_going (struct execution_control_state
*ecs
);
951 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
954 /* Wait for control to return from inferior to debugger.
955 If inferior gets a signal, we may decide to start it up again
956 instead of returning. That is why there is a loop in this function.
957 When this function actually returns it means the inferior
958 should be left stopped and GDB should read more commands. */
961 wait_for_inferior (void)
963 struct cleanup
*old_cleanups
;
964 struct execution_control_state ecss
;
965 struct execution_control_state
*ecs
;
968 fprintf_unfiltered (gdb_stdlog
, "infrun: wait_for_inferior\n");
970 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
971 &step_resume_breakpoint
);
973 /* wfi still stays in a loop, so it's OK just to take the address of
974 a local to get the ecs pointer. */
977 /* Fill in with reasonable starting values. */
978 init_execution_control_state (ecs
);
980 /* We'll update this if & when we switch to a new thread. */
981 previous_inferior_ptid
= inferior_ptid
;
983 overlay_cache_invalid
= 1;
985 /* We have to invalidate the registers BEFORE calling target_wait
986 because they can be loaded from the target while in target_wait.
987 This makes remote debugging a bit more efficient for those
988 targets that provide critical registers as part of their normal
991 registers_changed ();
995 if (deprecated_target_wait_hook
)
996 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
998 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1000 /* Now figure out what to do with the result of the result. */
1001 handle_inferior_event (ecs
);
1003 if (!ecs
->wait_some_more
)
1006 do_cleanups (old_cleanups
);
1009 /* Asynchronous version of wait_for_inferior. It is called by the
1010 event loop whenever a change of state is detected on the file
1011 descriptor corresponding to the target. It can be called more than
1012 once to complete a single execution command. In such cases we need
1013 to keep the state in a global variable ASYNC_ECSS. If it is the
1014 last time that this function is called for a single execution
1015 command, then report to the user that the inferior has stopped, and
1016 do the necessary cleanups. */
1018 struct execution_control_state async_ecss
;
1019 struct execution_control_state
*async_ecs
;
1022 fetch_inferior_event (void *client_data
)
1024 static struct cleanup
*old_cleanups
;
1026 async_ecs
= &async_ecss
;
1028 if (!async_ecs
->wait_some_more
)
1030 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1031 &step_resume_breakpoint
);
1033 /* Fill in with reasonable starting values. */
1034 init_execution_control_state (async_ecs
);
1036 /* We'll update this if & when we switch to a new thread. */
1037 previous_inferior_ptid
= inferior_ptid
;
1039 overlay_cache_invalid
= 1;
1041 /* We have to invalidate the registers BEFORE calling target_wait
1042 because they can be loaded from the target while in target_wait.
1043 This makes remote debugging a bit more efficient for those
1044 targets that provide critical registers as part of their normal
1045 status mechanism. */
1047 registers_changed ();
1050 if (deprecated_target_wait_hook
)
1052 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1054 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1056 /* Now figure out what to do with the result of the result. */
1057 handle_inferior_event (async_ecs
);
1059 if (!async_ecs
->wait_some_more
)
1061 /* Do only the cleanups that have been added by this
1062 function. Let the continuations for the commands do the rest,
1063 if there are any. */
1064 do_exec_cleanups (old_cleanups
);
1066 if (step_multi
&& stop_step
)
1067 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1069 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1073 /* Prepare an execution control state for looping through a
1074 wait_for_inferior-type loop. */
1077 init_execution_control_state (struct execution_control_state
*ecs
)
1079 /* ecs->another_trap? */
1080 ecs
->random_signal
= 0;
1081 ecs
->step_after_step_resume_breakpoint
= 0;
1082 ecs
->handling_longjmp
= 0; /* FIXME */
1083 ecs
->stepping_through_solib_after_catch
= 0;
1084 ecs
->stepping_through_solib_catchpoints
= NULL
;
1085 ecs
->sal
= find_pc_line (prev_pc
, 0);
1086 ecs
->current_line
= ecs
->sal
.line
;
1087 ecs
->current_symtab
= ecs
->sal
.symtab
;
1088 ecs
->infwait_state
= infwait_normal_state
;
1089 ecs
->waiton_ptid
= pid_to_ptid (-1);
1090 ecs
->wp
= &(ecs
->ws
);
1093 /* Return the cached copy of the last pid/waitstatus returned by
1094 target_wait()/deprecated_target_wait_hook(). The data is actually
1095 cached by handle_inferior_event(), which gets called immediately
1096 after target_wait()/deprecated_target_wait_hook(). */
1099 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1101 *ptidp
= target_last_wait_ptid
;
1102 *status
= target_last_waitstatus
;
1105 /* Switch thread contexts, maintaining "infrun state". */
1108 context_switch (struct execution_control_state
*ecs
)
1110 /* Caution: it may happen that the new thread (or the old one!)
1111 is not in the thread list. In this case we must not attempt
1112 to "switch context", or we run the risk that our context may
1113 be lost. This may happen as a result of the target module
1114 mishandling thread creation. */
1116 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1117 { /* Perform infrun state context switch: */
1118 /* Save infrun state for the old thread. */
1119 save_infrun_state (inferior_ptid
, prev_pc
,
1120 trap_expected
, step_resume_breakpoint
,
1122 step_range_end
, &step_frame_id
,
1123 ecs
->handling_longjmp
, ecs
->another_trap
,
1124 ecs
->stepping_through_solib_after_catch
,
1125 ecs
->stepping_through_solib_catchpoints
,
1126 ecs
->current_line
, ecs
->current_symtab
);
1128 /* Load infrun state for the new thread. */
1129 load_infrun_state (ecs
->ptid
, &prev_pc
,
1130 &trap_expected
, &step_resume_breakpoint
,
1132 &step_range_end
, &step_frame_id
,
1133 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1134 &ecs
->stepping_through_solib_after_catch
,
1135 &ecs
->stepping_through_solib_catchpoints
,
1136 &ecs
->current_line
, &ecs
->current_symtab
);
1138 inferior_ptid
= ecs
->ptid
;
1142 adjust_pc_after_break (struct execution_control_state
*ecs
)
1144 CORE_ADDR breakpoint_pc
;
1146 /* If this target does not decrement the PC after breakpoints, then
1147 we have nothing to do. */
1148 if (DECR_PC_AFTER_BREAK
== 0)
1151 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1152 we aren't, just return.
1154 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1155 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1156 by software breakpoints should be handled through the normal breakpoint
1159 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1160 different signals (SIGILL or SIGEMT for instance), but it is less
1161 clear where the PC is pointing afterwards. It may not match
1162 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1163 these signals at breakpoints (the code has been in GDB since at least
1164 1992) so I can not guess how to handle them here.
1166 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1167 would have the PC after hitting a watchpoint affected by
1168 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1169 in GDB history, and it seems unlikely to be correct, so
1170 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1172 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1175 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1178 /* Find the location where (if we've hit a breakpoint) the
1179 breakpoint would be. */
1180 breakpoint_pc
= read_pc_pid (ecs
->ptid
) - DECR_PC_AFTER_BREAK
;
1182 if (SOFTWARE_SINGLE_STEP_P ())
1184 /* When using software single-step, a SIGTRAP can only indicate
1185 an inserted breakpoint. This actually makes things
1187 if (singlestep_breakpoints_inserted_p
)
1188 /* When software single stepping, the instruction at [prev_pc]
1189 is never a breakpoint, but the instruction following
1190 [prev_pc] (in program execution order) always is. Assume
1191 that following instruction was reached and hence a software
1192 breakpoint was hit. */
1193 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1194 else if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1195 /* The inferior was free running (i.e., no single-step
1196 breakpoints inserted) and it hit a software breakpoint. */
1197 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1201 /* When using hardware single-step, a SIGTRAP is reported for
1202 both a completed single-step and a software breakpoint. Need
1203 to differentiate between the two as the latter needs
1204 adjusting but the former does not. */
1205 if (currently_stepping (ecs
))
1207 if (prev_pc
== breakpoint_pc
1208 && software_breakpoint_inserted_here_p (breakpoint_pc
))
1209 /* Hardware single-stepped a software breakpoint (as
1210 occures when the inferior is resumed with PC pointing
1211 at not-yet-hit software breakpoint). Since the
1212 breakpoint really is executed, the inferior needs to be
1213 backed up to the breakpoint address. */
1214 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1218 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1219 /* The inferior was free running (i.e., no hardware
1220 single-step and no possibility of a false SIGTRAP) and
1221 hit a software breakpoint. */
1222 write_pc_pid (breakpoint_pc
, ecs
->ptid
);
1227 /* Given an execution control state that has been freshly filled in
1228 by an event from the inferior, figure out what it means and take
1229 appropriate action. */
1231 int stepped_after_stopped_by_watchpoint
;
1234 handle_inferior_event (struct execution_control_state
*ecs
)
1236 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1237 thinking that the variable stepped_after_stopped_by_watchpoint
1238 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1239 defined in the file "config/pa/nm-hppah.h", accesses the variable
1240 indirectly. Mutter something rude about the HP merge. */
1241 int sw_single_step_trap_p
= 0;
1242 int stopped_by_watchpoint
= -1; /* Mark as unknown. */
1244 /* Cache the last pid/waitstatus. */
1245 target_last_wait_ptid
= ecs
->ptid
;
1246 target_last_waitstatus
= *ecs
->wp
;
1248 adjust_pc_after_break (ecs
);
1250 switch (ecs
->infwait_state
)
1252 case infwait_thread_hop_state
:
1254 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1255 /* Cancel the waiton_ptid. */
1256 ecs
->waiton_ptid
= pid_to_ptid (-1);
1259 case infwait_normal_state
:
1261 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
1262 stepped_after_stopped_by_watchpoint
= 0;
1265 case infwait_nonstep_watch_state
:
1267 fprintf_unfiltered (gdb_stdlog
,
1268 "infrun: infwait_nonstep_watch_state\n");
1269 insert_breakpoints ();
1271 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1272 handle things like signals arriving and other things happening
1273 in combination correctly? */
1274 stepped_after_stopped_by_watchpoint
= 1;
1278 internal_error (__FILE__
, __LINE__
, _("bad switch"));
1280 ecs
->infwait_state
= infwait_normal_state
;
1282 flush_cached_frames ();
1284 /* If it's a new process, add it to the thread database */
1286 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1287 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1288 && !in_thread_list (ecs
->ptid
));
1290 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1291 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1293 add_thread (ecs
->ptid
);
1295 ui_out_text (uiout
, "[New ");
1296 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1297 ui_out_text (uiout
, "]\n");
1300 switch (ecs
->ws
.kind
)
1302 case TARGET_WAITKIND_LOADED
:
1304 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
1305 /* Ignore gracefully during startup of the inferior, as it
1306 might be the shell which has just loaded some objects,
1307 otherwise add the symbols for the newly loaded objects. */
1309 if (stop_soon
== NO_STOP_QUIETLY
)
1311 /* Remove breakpoints, SOLIB_ADD might adjust
1312 breakpoint addresses via breakpoint_re_set. */
1313 if (breakpoints_inserted
)
1314 remove_breakpoints ();
1316 /* Check for any newly added shared libraries if we're
1317 supposed to be adding them automatically. Switch
1318 terminal for any messages produced by
1319 breakpoint_re_set. */
1320 target_terminal_ours_for_output ();
1321 /* NOTE: cagney/2003-11-25: Make certain that the target
1322 stack's section table is kept up-to-date. Architectures,
1323 (e.g., PPC64), use the section table to perform
1324 operations such as address => section name and hence
1325 require the table to contain all sections (including
1326 those found in shared libraries). */
1327 /* NOTE: cagney/2003-11-25: Pass current_target and not
1328 exec_ops to SOLIB_ADD. This is because current GDB is
1329 only tooled to propagate section_table changes out from
1330 the "current_target" (see target_resize_to_sections), and
1331 not up from the exec stratum. This, of course, isn't
1332 right. "infrun.c" should only interact with the
1333 exec/process stratum, instead relying on the target stack
1334 to propagate relevant changes (stop, section table
1335 changed, ...) up to other layers. */
1336 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1337 target_terminal_inferior ();
1339 /* Reinsert breakpoints and continue. */
1340 if (breakpoints_inserted
)
1341 insert_breakpoints ();
1344 resume (0, TARGET_SIGNAL_0
);
1345 prepare_to_wait (ecs
);
1348 case TARGET_WAITKIND_SPURIOUS
:
1350 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1351 resume (0, TARGET_SIGNAL_0
);
1352 prepare_to_wait (ecs
);
1355 case TARGET_WAITKIND_EXITED
:
1357 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
1358 target_terminal_ours (); /* Must do this before mourn anyway */
1359 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1361 /* Record the exit code in the convenience variable $_exitcode, so
1362 that the user can inspect this again later. */
1363 set_internalvar (lookup_internalvar ("_exitcode"),
1364 value_from_longest (builtin_type_int
,
1365 (LONGEST
) ecs
->ws
.value
.integer
));
1366 gdb_flush (gdb_stdout
);
1367 target_mourn_inferior ();
1368 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1369 stop_print_frame
= 0;
1370 stop_stepping (ecs
);
1373 case TARGET_WAITKIND_SIGNALLED
:
1375 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1376 stop_print_frame
= 0;
1377 stop_signal
= ecs
->ws
.value
.sig
;
1378 target_terminal_ours (); /* Must do this before mourn anyway */
1380 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1381 reach here unless the inferior is dead. However, for years
1382 target_kill() was called here, which hints that fatal signals aren't
1383 really fatal on some systems. If that's true, then some changes
1385 target_mourn_inferior ();
1387 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1388 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1389 stop_stepping (ecs
);
1392 /* The following are the only cases in which we keep going;
1393 the above cases end in a continue or goto. */
1394 case TARGET_WAITKIND_FORKED
:
1395 case TARGET_WAITKIND_VFORKED
:
1397 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
1398 stop_signal
= TARGET_SIGNAL_TRAP
;
1399 pending_follow
.kind
= ecs
->ws
.kind
;
1401 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1402 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1404 stop_pc
= read_pc ();
1406 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1408 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1410 /* If no catchpoint triggered for this, then keep going. */
1411 if (ecs
->random_signal
)
1413 stop_signal
= TARGET_SIGNAL_0
;
1417 goto process_event_stop_test
;
1419 case TARGET_WAITKIND_EXECD
:
1421 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECED\n");
1422 stop_signal
= TARGET_SIGNAL_TRAP
;
1424 /* NOTE drow/2002-12-05: This code should be pushed down into the
1425 target_wait function. Until then following vfork on HP/UX 10.20
1426 is probably broken by this. Of course, it's broken anyway. */
1427 /* Is this a target which reports multiple exec events per actual
1428 call to exec()? (HP-UX using ptrace does, for example.) If so,
1429 ignore all but the last one. Just resume the exec'r, and wait
1430 for the next exec event. */
1431 if (inferior_ignoring_leading_exec_events
)
1433 inferior_ignoring_leading_exec_events
--;
1434 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1435 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1437 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1438 prepare_to_wait (ecs
);
1441 inferior_ignoring_leading_exec_events
=
1442 target_reported_exec_events_per_exec_call () - 1;
1444 pending_follow
.execd_pathname
=
1445 savestring (ecs
->ws
.value
.execd_pathname
,
1446 strlen (ecs
->ws
.value
.execd_pathname
));
1448 /* This causes the eventpoints and symbol table to be reset. Must
1449 do this now, before trying to determine whether to stop. */
1450 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1451 xfree (pending_follow
.execd_pathname
);
1453 stop_pc
= read_pc_pid (ecs
->ptid
);
1454 ecs
->saved_inferior_ptid
= inferior_ptid
;
1455 inferior_ptid
= ecs
->ptid
;
1457 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
, 0);
1459 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1460 inferior_ptid
= ecs
->saved_inferior_ptid
;
1462 /* If no catchpoint triggered for this, then keep going. */
1463 if (ecs
->random_signal
)
1465 stop_signal
= TARGET_SIGNAL_0
;
1469 goto process_event_stop_test
;
1471 /* Be careful not to try to gather much state about a thread
1472 that's in a syscall. It's frequently a losing proposition. */
1473 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1475 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1476 resume (0, TARGET_SIGNAL_0
);
1477 prepare_to_wait (ecs
);
1480 /* Before examining the threads further, step this thread to
1481 get it entirely out of the syscall. (We get notice of the
1482 event when the thread is just on the verge of exiting a
1483 syscall. Stepping one instruction seems to get it back
1485 case TARGET_WAITKIND_SYSCALL_RETURN
:
1487 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1488 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1489 prepare_to_wait (ecs
);
1492 case TARGET_WAITKIND_STOPPED
:
1494 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
1495 stop_signal
= ecs
->ws
.value
.sig
;
1498 /* We had an event in the inferior, but we are not interested
1499 in handling it at this level. The lower layers have already
1500 done what needs to be done, if anything.
1502 One of the possible circumstances for this is when the
1503 inferior produces output for the console. The inferior has
1504 not stopped, and we are ignoring the event. Another possible
1505 circumstance is any event which the lower level knows will be
1506 reported multiple times without an intervening resume. */
1507 case TARGET_WAITKIND_IGNORE
:
1509 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
1510 prepare_to_wait (ecs
);
1514 /* We may want to consider not doing a resume here in order to give
1515 the user a chance to play with the new thread. It might be good
1516 to make that a user-settable option. */
1518 /* At this point, all threads are stopped (happens automatically in
1519 either the OS or the native code). Therefore we need to continue
1520 all threads in order to make progress. */
1521 if (ecs
->new_thread_event
)
1523 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1524 prepare_to_wait (ecs
);
1528 stop_pc
= read_pc_pid (ecs
->ptid
);
1531 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc
));
1533 if (stepping_past_singlestep_breakpoint
)
1535 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1536 && singlestep_breakpoints_inserted_p
);
1537 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1538 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1540 stepping_past_singlestep_breakpoint
= 0;
1542 /* We've either finished single-stepping past the single-step
1543 breakpoint, or stopped for some other reason. It would be nice if
1544 we could tell, but we can't reliably. */
1545 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1548 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
1549 /* Pull the single step breakpoints out of the target. */
1550 SOFTWARE_SINGLE_STEP (0, 0);
1551 singlestep_breakpoints_inserted_p
= 0;
1553 ecs
->random_signal
= 0;
1555 ecs
->ptid
= saved_singlestep_ptid
;
1556 context_switch (ecs
);
1557 if (deprecated_context_hook
)
1558 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1560 resume (1, TARGET_SIGNAL_0
);
1561 prepare_to_wait (ecs
);
1566 stepping_past_singlestep_breakpoint
= 0;
1568 /* See if a thread hit a thread-specific breakpoint that was meant for
1569 another thread. If so, then step that thread past the breakpoint,
1572 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1574 int thread_hop_needed
= 0;
1576 /* Check if a regular breakpoint has been hit before checking
1577 for a potential single step breakpoint. Otherwise, GDB will
1578 not see this breakpoint hit when stepping onto breakpoints. */
1579 if (breakpoints_inserted
&& breakpoint_here_p (stop_pc
))
1581 ecs
->random_signal
= 0;
1582 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1583 thread_hop_needed
= 1;
1585 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1587 ecs
->random_signal
= 0;
1588 /* The call to in_thread_list is necessary because PTIDs sometimes
1589 change when we go from single-threaded to multi-threaded. If
1590 the singlestep_ptid is still in the list, assume that it is
1591 really different from ecs->ptid. */
1592 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1593 && in_thread_list (singlestep_ptid
))
1595 thread_hop_needed
= 1;
1596 stepping_past_singlestep_breakpoint
= 1;
1597 saved_singlestep_ptid
= singlestep_ptid
;
1601 if (thread_hop_needed
)
1606 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
1608 /* Saw a breakpoint, but it was hit by the wrong thread.
1611 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1613 /* Pull the single step breakpoints out of the target. */
1614 SOFTWARE_SINGLE_STEP (0, 0);
1615 singlestep_breakpoints_inserted_p
= 0;
1618 remove_status
= remove_breakpoints ();
1619 /* Did we fail to remove breakpoints? If so, try
1620 to set the PC past the bp. (There's at least
1621 one situation in which we can fail to remove
1622 the bp's: On HP-UX's that use ttrace, we can't
1623 change the address space of a vforking child
1624 process until the child exits (well, okay, not
1625 then either :-) or execs. */
1626 if (remove_status
!= 0)
1628 /* FIXME! This is obviously non-portable! */
1629 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1630 /* We need to restart all the threads now,
1631 * unles we're running in scheduler-locked mode.
1632 * Use currently_stepping to determine whether to
1635 /* FIXME MVS: is there any reason not to call resume()? */
1636 if (scheduler_mode
== schedlock_on
)
1637 target_resume (ecs
->ptid
,
1638 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1640 target_resume (RESUME_ALL
,
1641 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1642 prepare_to_wait (ecs
);
1647 breakpoints_inserted
= 0;
1648 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1649 context_switch (ecs
);
1650 ecs
->waiton_ptid
= ecs
->ptid
;
1651 ecs
->wp
= &(ecs
->ws
);
1652 ecs
->another_trap
= 1;
1654 ecs
->infwait_state
= infwait_thread_hop_state
;
1656 registers_changed ();
1660 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1662 sw_single_step_trap_p
= 1;
1663 ecs
->random_signal
= 0;
1667 ecs
->random_signal
= 1;
1669 /* See if something interesting happened to the non-current thread. If
1670 so, then switch to that thread. */
1671 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1674 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
1676 context_switch (ecs
);
1678 if (deprecated_context_hook
)
1679 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1681 flush_cached_frames ();
1684 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1686 /* Pull the single step breakpoints out of the target. */
1687 SOFTWARE_SINGLE_STEP (0, 0);
1688 singlestep_breakpoints_inserted_p
= 0;
1691 /* It may not be necessary to disable the watchpoint to stop over
1692 it. For example, the PA can (with some kernel cooperation)
1693 single step over a watchpoint without disabling the watchpoint. */
1694 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1697 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1699 prepare_to_wait (ecs
);
1703 /* It is far more common to need to disable a watchpoint to step
1704 the inferior over it. FIXME. What else might a debug
1705 register or page protection watchpoint scheme need here? */
1706 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1708 /* At this point, we are stopped at an instruction which has
1709 attempted to write to a piece of memory under control of
1710 a watchpoint. The instruction hasn't actually executed
1711 yet. If we were to evaluate the watchpoint expression
1712 now, we would get the old value, and therefore no change
1713 would seem to have occurred.
1715 In order to make watchpoints work `right', we really need
1716 to complete the memory write, and then evaluate the
1717 watchpoint expression. The following code does that by
1718 removing the watchpoint (actually, all watchpoints and
1719 breakpoints), single-stepping the target, re-inserting
1720 watchpoints, and then falling through to let normal
1721 single-step processing handle proceed. Since this
1722 includes evaluating watchpoints, things will come to a
1723 stop in the correct manner. */
1726 fprintf_unfiltered (gdb_stdlog
, "infrun: STOPPED_BY_WATCHPOINT\n");
1727 remove_breakpoints ();
1728 registers_changed ();
1729 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1731 ecs
->waiton_ptid
= ecs
->ptid
;
1732 ecs
->wp
= &(ecs
->ws
);
1733 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1734 prepare_to_wait (ecs
);
1738 /* It may be possible to simply continue after a watchpoint. */
1739 if (HAVE_CONTINUABLE_WATCHPOINT
)
1740 stopped_by_watchpoint
= STOPPED_BY_WATCHPOINT (ecs
->ws
);
1742 ecs
->stop_func_start
= 0;
1743 ecs
->stop_func_end
= 0;
1744 ecs
->stop_func_name
= 0;
1745 /* Don't care about return value; stop_func_start and stop_func_name
1746 will both be 0 if it doesn't work. */
1747 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1748 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1749 ecs
->stop_func_start
+= DEPRECATED_FUNCTION_START_OFFSET
;
1750 ecs
->another_trap
= 0;
1751 bpstat_clear (&stop_bpstat
);
1753 stop_stack_dummy
= 0;
1754 stop_print_frame
= 1;
1755 ecs
->random_signal
= 0;
1756 stopped_by_random_signal
= 0;
1757 breakpoints_failed
= 0;
1759 if (stop_signal
== TARGET_SIGNAL_TRAP
1761 && gdbarch_single_step_through_delay_p (current_gdbarch
)
1762 && currently_stepping (ecs
))
1764 /* We're trying to step of a breakpoint. Turns out that we're
1765 also on an instruction that needs to be stepped multiple
1766 times before it's been fully executing. E.g., architectures
1767 with a delay slot. It needs to be stepped twice, once for
1768 the instruction and once for the delay slot. */
1769 int step_through_delay
1770 = gdbarch_single_step_through_delay (current_gdbarch
,
1771 get_current_frame ());
1772 if (debug_infrun
&& step_through_delay
)
1773 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
1774 if (step_range_end
== 0 && step_through_delay
)
1776 /* The user issued a continue when stopped at a breakpoint.
1777 Set up for another trap and get out of here. */
1778 ecs
->another_trap
= 1;
1782 else if (step_through_delay
)
1784 /* The user issued a step when stopped at a breakpoint.
1785 Maybe we should stop, maybe we should not - the delay
1786 slot *might* correspond to a line of source. In any
1787 case, don't decide that here, just set ecs->another_trap,
1788 making sure we single-step again before breakpoints are
1790 ecs
->another_trap
= 1;
1794 /* Look at the cause of the stop, and decide what to do.
1795 The alternatives are:
1796 1) break; to really stop and return to the debugger,
1797 2) drop through to start up again
1798 (set ecs->another_trap to 1 to single step once)
1799 3) set ecs->random_signal to 1, and the decision between 1 and 2
1800 will be made according to the signal handling tables. */
1802 /* First, distinguish signals caused by the debugger from signals
1803 that have to do with the program's own actions. Note that
1804 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1805 on the operating system version. Here we detect when a SIGILL or
1806 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1807 something similar for SIGSEGV, since a SIGSEGV will be generated
1808 when we're trying to execute a breakpoint instruction on a
1809 non-executable stack. This happens for call dummy breakpoints
1810 for architectures like SPARC that place call dummies on the
1813 if (stop_signal
== TARGET_SIGNAL_TRAP
1814 || (breakpoints_inserted
1815 && (stop_signal
== TARGET_SIGNAL_ILL
1816 || stop_signal
== TARGET_SIGNAL_SEGV
1817 || stop_signal
== TARGET_SIGNAL_EMT
))
1818 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1820 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1823 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
1824 stop_print_frame
= 0;
1825 stop_stepping (ecs
);
1829 /* This is originated from start_remote(), start_inferior() and
1830 shared libraries hook functions. */
1831 if (stop_soon
== STOP_QUIETLY
)
1834 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
1835 stop_stepping (ecs
);
1839 /* This originates from attach_command(). We need to overwrite
1840 the stop_signal here, because some kernels don't ignore a
1841 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1842 See more comments in inferior.h. */
1843 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1845 stop_stepping (ecs
);
1846 if (stop_signal
== TARGET_SIGNAL_STOP
)
1847 stop_signal
= TARGET_SIGNAL_0
;
1851 /* Don't even think about breakpoints if just proceeded over a
1853 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
)
1856 fprintf_unfiltered (gdb_stdlog
, "infrun: trap expected\n");
1857 bpstat_clear (&stop_bpstat
);
1861 /* See if there is a breakpoint at the current PC. */
1862 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
,
1863 stopped_by_watchpoint
);
1865 /* Following in case break condition called a
1867 stop_print_frame
= 1;
1870 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1871 at one stage in the past included checks for an inferior
1872 function call's call dummy's return breakpoint. The original
1873 comment, that went with the test, read:
1875 ``End of a stack dummy. Some systems (e.g. Sony news) give
1876 another signal besides SIGTRAP, so check here as well as
1879 If someone ever tries to get get call dummys on a
1880 non-executable stack to work (where the target would stop
1881 with something like a SIGSEGV), then those tests might need
1882 to be re-instated. Given, however, that the tests were only
1883 enabled when momentary breakpoints were not being used, I
1884 suspect that it won't be the case.
1886 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1887 be necessary for call dummies on a non-executable stack on
1890 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1892 = !(bpstat_explains_signal (stop_bpstat
)
1894 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1897 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1898 if (!ecs
->random_signal
)
1899 stop_signal
= TARGET_SIGNAL_TRAP
;
1903 /* When we reach this point, we've pretty much decided
1904 that the reason for stopping must've been a random
1905 (unexpected) signal. */
1908 ecs
->random_signal
= 1;
1910 process_event_stop_test
:
1911 /* For the program's own signals, act according to
1912 the signal handling tables. */
1914 if (ecs
->random_signal
)
1916 /* Signal not for debugging purposes. */
1920 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
1922 stopped_by_random_signal
= 1;
1924 if (signal_print
[stop_signal
])
1927 target_terminal_ours_for_output ();
1928 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1930 if (signal_stop
[stop_signal
])
1932 stop_stepping (ecs
);
1935 /* If not going to stop, give terminal back
1936 if we took it away. */
1938 target_terminal_inferior ();
1940 /* Clear the signal if it should not be passed. */
1941 if (signal_program
[stop_signal
] == 0)
1942 stop_signal
= TARGET_SIGNAL_0
;
1944 if (prev_pc
== read_pc ()
1945 && !breakpoints_inserted
1946 && breakpoint_here_p (read_pc ())
1947 && step_resume_breakpoint
== NULL
)
1949 /* We were just starting a new sequence, attempting to
1950 single-step off of a breakpoint and expecting a SIGTRAP.
1951 Intead this signal arrives. This signal will take us out
1952 of the stepping range so GDB needs to remember to, when
1953 the signal handler returns, resume stepping off that
1955 /* To simplify things, "continue" is forced to use the same
1956 code paths as single-step - set a breakpoint at the
1957 signal return address and then, once hit, step off that
1959 insert_step_resume_breakpoint_at_frame (get_current_frame ());
1960 ecs
->step_after_step_resume_breakpoint
= 1;
1965 if (step_range_end
!= 0
1966 && stop_signal
!= TARGET_SIGNAL_0
1967 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
1968 && frame_id_eq (get_frame_id (get_current_frame ()),
1970 && step_resume_breakpoint
== NULL
)
1972 /* The inferior is about to take a signal that will take it
1973 out of the single step range. Set a breakpoint at the
1974 current PC (which is presumably where the signal handler
1975 will eventually return) and then allow the inferior to
1978 Note that this is only needed for a signal delivered
1979 while in the single-step range. Nested signals aren't a
1980 problem as they eventually all return. */
1981 insert_step_resume_breakpoint_at_frame (get_current_frame ());
1986 /* Note: step_resume_breakpoint may be non-NULL. This occures
1987 when either there's a nested signal, or when there's a
1988 pending signal enabled just as the signal handler returns
1989 (leaving the inferior at the step-resume-breakpoint without
1990 actually executing it). Either way continue until the
1991 breakpoint is really hit. */
1996 /* Handle cases caused by hitting a breakpoint. */
1998 CORE_ADDR jmp_buf_pc
;
1999 struct bpstat_what what
;
2001 what
= bpstat_what (stop_bpstat
);
2003 if (what
.call_dummy
)
2005 stop_stack_dummy
= 1;
2008 switch (what
.main_action
)
2010 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2011 /* If we hit the breakpoint at longjmp, disable it for the
2012 duration of this command. Then, install a temporary
2013 breakpoint at the target of the jmp_buf. */
2015 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTATE_WHAT_SET_LONGJMP_RESUME\n");
2016 disable_longjmp_breakpoint ();
2017 remove_breakpoints ();
2018 breakpoints_inserted
= 0;
2019 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
2025 /* Need to blow away step-resume breakpoint, as it
2026 interferes with us */
2027 if (step_resume_breakpoint
!= NULL
)
2029 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2032 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2033 ecs
->handling_longjmp
= 1; /* FIXME */
2037 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2038 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2040 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTATE_WHAT_CLEAR_LONGJMP_RESUME\n");
2041 remove_breakpoints ();
2042 breakpoints_inserted
= 0;
2043 disable_longjmp_breakpoint ();
2044 ecs
->handling_longjmp
= 0; /* FIXME */
2045 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2047 /* else fallthrough */
2049 case BPSTAT_WHAT_SINGLE
:
2051 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTATE_WHAT_SINGLE\n");
2052 if (breakpoints_inserted
)
2054 remove_breakpoints ();
2056 breakpoints_inserted
= 0;
2057 ecs
->another_trap
= 1;
2058 /* Still need to check other stuff, at least the case
2059 where we are stepping and step out of the right range. */
2062 case BPSTAT_WHAT_STOP_NOISY
:
2064 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTATE_WHAT_STOP_NOISY\n");
2065 stop_print_frame
= 1;
2067 /* We are about to nuke the step_resume_breakpointt via the
2068 cleanup chain, so no need to worry about it here. */
2070 stop_stepping (ecs
);
2073 case BPSTAT_WHAT_STOP_SILENT
:
2075 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTATE_WHAT_STOP_SILENT\n");
2076 stop_print_frame
= 0;
2078 /* We are about to nuke the step_resume_breakpoin via the
2079 cleanup chain, so no need to worry about it here. */
2081 stop_stepping (ecs
);
2084 case BPSTAT_WHAT_STEP_RESUME
:
2085 /* This proably demands a more elegant solution, but, yeah
2088 This function's use of the simple variable
2089 step_resume_breakpoint doesn't seem to accomodate
2090 simultaneously active step-resume bp's, although the
2091 breakpoint list certainly can.
2093 If we reach here and step_resume_breakpoint is already
2094 NULL, then apparently we have multiple active
2095 step-resume bp's. We'll just delete the breakpoint we
2096 stopped at, and carry on.
2098 Correction: what the code currently does is delete a
2099 step-resume bp, but it makes no effort to ensure that
2100 the one deleted is the one currently stopped at. MVS */
2103 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTATE_WHAT_STEP_RESUME\n");
2105 if (step_resume_breakpoint
== NULL
)
2107 step_resume_breakpoint
=
2108 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2110 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2111 if (ecs
->step_after_step_resume_breakpoint
)
2113 /* Back when the step-resume breakpoint was inserted, we
2114 were trying to single-step off a breakpoint. Go back
2116 ecs
->step_after_step_resume_breakpoint
= 0;
2117 remove_breakpoints ();
2118 breakpoints_inserted
= 0;
2119 ecs
->another_trap
= 1;
2125 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2127 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTATE_WHAT_THROUGH_SIGTRAMP\n");
2128 /* If were waiting for a trap, hitting the step_resume_break
2129 doesn't count as getting it. */
2131 ecs
->another_trap
= 1;
2134 case BPSTAT_WHAT_CHECK_SHLIBS
:
2135 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2139 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTATE_WHAT_CHECK_SHLIBS\n");
2140 /* Remove breakpoints, we eventually want to step over the
2141 shlib event breakpoint, and SOLIB_ADD might adjust
2142 breakpoint addresses via breakpoint_re_set. */
2143 if (breakpoints_inserted
)
2144 remove_breakpoints ();
2145 breakpoints_inserted
= 0;
2147 /* Check for any newly added shared libraries if we're
2148 supposed to be adding them automatically. Switch
2149 terminal for any messages produced by
2150 breakpoint_re_set. */
2151 target_terminal_ours_for_output ();
2152 /* NOTE: cagney/2003-11-25: Make certain that the target
2153 stack's section table is kept up-to-date. Architectures,
2154 (e.g., PPC64), use the section table to perform
2155 operations such as address => section name and hence
2156 require the table to contain all sections (including
2157 those found in shared libraries). */
2158 /* NOTE: cagney/2003-11-25: Pass current_target and not
2159 exec_ops to SOLIB_ADD. This is because current GDB is
2160 only tooled to propagate section_table changes out from
2161 the "current_target" (see target_resize_to_sections), and
2162 not up from the exec stratum. This, of course, isn't
2163 right. "infrun.c" should only interact with the
2164 exec/process stratum, instead relying on the target stack
2165 to propagate relevant changes (stop, section table
2166 changed, ...) up to other layers. */
2167 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2168 target_terminal_inferior ();
2170 /* Try to reenable shared library breakpoints, additional
2171 code segments in shared libraries might be mapped in now. */
2172 re_enable_breakpoints_in_shlibs ();
2174 /* If requested, stop when the dynamic linker notifies
2175 gdb of events. This allows the user to get control
2176 and place breakpoints in initializer routines for
2177 dynamically loaded objects (among other things). */
2178 if (stop_on_solib_events
|| stop_stack_dummy
)
2180 stop_stepping (ecs
);
2184 /* If we stopped due to an explicit catchpoint, then the
2185 (see above) call to SOLIB_ADD pulled in any symbols
2186 from a newly-loaded library, if appropriate.
2188 We do want the inferior to stop, but not where it is
2189 now, which is in the dynamic linker callback. Rather,
2190 we would like it stop in the user's program, just after
2191 the call that caused this catchpoint to trigger. That
2192 gives the user a more useful vantage from which to
2193 examine their program's state. */
2194 else if (what
.main_action
2195 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2197 /* ??rehrauer: If I could figure out how to get the
2198 right return PC from here, we could just set a temp
2199 breakpoint and resume. I'm not sure we can without
2200 cracking open the dld's shared libraries and sniffing
2201 their unwind tables and text/data ranges, and that's
2202 not a terribly portable notion.
2204 Until that time, we must step the inferior out of the
2205 dld callback, and also out of the dld itself (and any
2206 code or stubs in libdld.sl, such as "shl_load" and
2207 friends) until we reach non-dld code. At that point,
2208 we can stop stepping. */
2209 bpstat_get_triggered_catchpoints (stop_bpstat
,
2211 stepping_through_solib_catchpoints
);
2212 ecs
->stepping_through_solib_after_catch
= 1;
2214 /* Be sure to lift all breakpoints, so the inferior does
2215 actually step past this point... */
2216 ecs
->another_trap
= 1;
2221 /* We want to step over this breakpoint, then keep going. */
2222 ecs
->another_trap
= 1;
2229 case BPSTAT_WHAT_LAST
:
2230 /* Not a real code, but listed here to shut up gcc -Wall. */
2232 case BPSTAT_WHAT_KEEP_CHECKING
:
2237 /* We come here if we hit a breakpoint but should not
2238 stop for it. Possibly we also were stepping
2239 and should stop for that. So fall through and
2240 test for stepping. But, if not stepping,
2243 /* Are we stepping to get the inferior out of the dynamic linker's
2244 hook (and possibly the dld itself) after catching a shlib
2246 if (ecs
->stepping_through_solib_after_catch
)
2248 #if defined(SOLIB_ADD)
2249 /* Have we reached our destination? If not, keep going. */
2250 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2253 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2254 ecs
->another_trap
= 1;
2260 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2261 /* Else, stop and report the catchpoint(s) whose triggering
2262 caused us to begin stepping. */
2263 ecs
->stepping_through_solib_after_catch
= 0;
2264 bpstat_clear (&stop_bpstat
);
2265 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2266 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2267 stop_print_frame
= 1;
2268 stop_stepping (ecs
);
2272 if (step_resume_breakpoint
)
2275 fprintf_unfiltered (gdb_stdlog
, "infrun: step-resume breakpoint\n");
2277 /* Having a step-resume breakpoint overrides anything
2278 else having to do with stepping commands until
2279 that breakpoint is reached. */
2284 if (step_range_end
== 0)
2287 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
2288 /* Likewise if we aren't even stepping. */
2293 /* If stepping through a line, keep going if still within it.
2295 Note that step_range_end is the address of the first instruction
2296 beyond the step range, and NOT the address of the last instruction
2298 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2301 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
2302 paddr_nz (step_range_start
),
2303 paddr_nz (step_range_end
));
2308 /* We stepped out of the stepping range. */
2310 /* If we are stepping at the source level and entered the runtime
2311 loader dynamic symbol resolution code, we keep on single stepping
2312 until we exit the run time loader code and reach the callee's
2314 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2315 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2317 CORE_ADDR pc_after_resolver
=
2318 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2321 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
2323 if (pc_after_resolver
)
2325 /* Set up a step-resume breakpoint at the address
2326 indicated by SKIP_SOLIB_RESOLVER. */
2327 struct symtab_and_line sr_sal
;
2329 sr_sal
.pc
= pc_after_resolver
;
2331 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2338 if (step_range_end
!= 1
2339 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2340 || step_over_calls
== STEP_OVER_ALL
)
2341 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2344 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
2345 /* The inferior, while doing a "step" or "next", has ended up in
2346 a signal trampoline (either by a signal being delivered or by
2347 the signal handler returning). Just single-step until the
2348 inferior leaves the trampoline (either by calling the handler
2354 if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2356 /* It's a subroutine call. */
2357 CORE_ADDR real_stop_pc
;
2360 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
2362 if ((step_over_calls
== STEP_OVER_NONE
)
2363 || ((step_range_end
== 1)
2364 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2366 /* I presume that step_over_calls is only 0 when we're
2367 supposed to be stepping at the assembly language level
2368 ("stepi"). Just stop. */
2369 /* Also, maybe we just did a "nexti" inside a prolog, so we
2370 thought it was a subroutine call but it was not. Stop as
2373 print_stop_reason (END_STEPPING_RANGE
, 0);
2374 stop_stepping (ecs
);
2378 if (step_over_calls
== STEP_OVER_ALL
)
2380 /* We're doing a "next", set a breakpoint at callee's return
2381 address (the address at which the caller will
2383 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2388 /* If we are in a function call trampoline (a stub between the
2389 calling routine and the real function), locate the real
2390 function. That's what tells us (a) whether we want to step
2391 into it at all, and (b) what prologue we want to run to the
2392 end of, if we do step into it. */
2393 real_stop_pc
= skip_language_trampoline (stop_pc
);
2394 if (real_stop_pc
== 0)
2395 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2396 if (real_stop_pc
!= 0)
2397 ecs
->stop_func_start
= real_stop_pc
;
2399 if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
))
2401 struct symtab_and_line sr_sal
;
2403 sr_sal
.pc
= ecs
->stop_func_start
;
2405 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2410 /* If we have line number information for the function we are
2411 thinking of stepping into, step into it.
2413 If there are several symtabs at that PC (e.g. with include
2414 files), just want to know whether *any* of them have line
2415 numbers. find_pc_line handles this. */
2417 struct symtab_and_line tmp_sal
;
2419 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2420 if (tmp_sal
.line
!= 0)
2422 step_into_function (ecs
);
2427 /* If we have no line number and the step-stop-if-no-debug is
2428 set, we stop the step so that the user has a chance to switch
2429 in assembly mode. */
2430 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2433 print_stop_reason (END_STEPPING_RANGE
, 0);
2434 stop_stepping (ecs
);
2438 /* Set a breakpoint at callee's return address (the address at
2439 which the caller will resume). */
2440 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2445 /* If we're in the return path from a shared library trampoline,
2446 we want to proceed through the trampoline when stepping. */
2447 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2449 /* Determine where this trampoline returns. */
2450 CORE_ADDR real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2453 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
2455 /* Only proceed through if we know where it's going. */
2458 /* And put the step-breakpoint there and go until there. */
2459 struct symtab_and_line sr_sal
;
2461 init_sal (&sr_sal
); /* initialize to zeroes */
2462 sr_sal
.pc
= real_stop_pc
;
2463 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2465 /* Do not specify what the fp should be when we stop since
2466 on some machines the prologue is where the new fp value
2468 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2470 /* Restart without fiddling with the step ranges or
2477 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2478 the trampoline processing logic, however, there are some trampolines
2479 that have no names, so we should do trampoline handling first. */
2480 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2481 && ecs
->stop_func_name
== NULL
)
2484 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
2486 /* The inferior just stepped into, or returned to, an
2487 undebuggable function (where there is no symbol, not even a
2488 minimal symbol, corresponding to the address where the
2489 inferior stopped). Since we want to skip this kind of code,
2490 we keep going until the inferior returns from this
2492 if (step_stop_if_no_debug
)
2494 /* If we have no line number and the step-stop-if-no-debug
2495 is set, we stop the step so that the user has a chance to
2496 switch in assembly mode. */
2498 print_stop_reason (END_STEPPING_RANGE
, 0);
2499 stop_stepping (ecs
);
2504 /* Set a breakpoint at callee's return address (the address
2505 at which the caller will resume). */
2506 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2512 if (step_range_end
== 1)
2514 /* It is stepi or nexti. We always want to stop stepping after
2517 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
2519 print_stop_reason (END_STEPPING_RANGE
, 0);
2520 stop_stepping (ecs
);
2524 ecs
->sal
= find_pc_line (stop_pc
, 0);
2526 if (ecs
->sal
.line
== 0)
2528 /* We have no line number information. That means to stop
2529 stepping (does this always happen right after one instruction,
2530 when we do "s" in a function with no line numbers,
2531 or can this happen as a result of a return or longjmp?). */
2533 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
2535 print_stop_reason (END_STEPPING_RANGE
, 0);
2536 stop_stepping (ecs
);
2540 if ((stop_pc
== ecs
->sal
.pc
)
2541 && (ecs
->current_line
!= ecs
->sal
.line
2542 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2544 /* We are at the start of a different line. So stop. Note that
2545 we don't stop if we step into the middle of a different line.
2546 That is said to make things like for (;;) statements work
2549 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
2551 print_stop_reason (END_STEPPING_RANGE
, 0);
2552 stop_stepping (ecs
);
2556 /* We aren't done stepping.
2558 Optimize by setting the stepping range to the line.
2559 (We might not be in the original line, but if we entered a
2560 new line in mid-statement, we continue stepping. This makes
2561 things like for(;;) statements work better.) */
2563 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2565 /* If this is the last line of the function, don't keep stepping
2566 (it would probably step us out of the function).
2567 This is particularly necessary for a one-line function,
2568 in which after skipping the prologue we better stop even though
2569 we will be in mid-line. */
2571 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different function\n");
2573 print_stop_reason (END_STEPPING_RANGE
, 0);
2574 stop_stepping (ecs
);
2577 step_range_start
= ecs
->sal
.pc
;
2578 step_range_end
= ecs
->sal
.end
;
2579 step_frame_id
= get_frame_id (get_current_frame ());
2580 ecs
->current_line
= ecs
->sal
.line
;
2581 ecs
->current_symtab
= ecs
->sal
.symtab
;
2583 /* In the case where we just stepped out of a function into the
2584 middle of a line of the caller, continue stepping, but
2585 step_frame_id must be modified to current frame */
2587 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2588 generous. It will trigger on things like a step into a frameless
2589 stackless leaf function. I think the logic should instead look
2590 at the unwound frame ID has that should give a more robust
2591 indication of what happened. */
2592 if (step
- ID
== current
- ID
)
2593 still stepping in same function
;
2594 else if (step
- ID
== unwind (current
- ID
))
2595 stepped into a function
;
2597 stepped out of a function
;
2598 /* Of course this assumes that the frame ID unwind code is robust
2599 and we're willing to introduce frame unwind logic into this
2600 function. Fortunately, those days are nearly upon us. */
2603 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2604 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2605 step_frame_id
= current_frame
;
2609 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
2613 /* Are we in the middle of stepping? */
2616 currently_stepping (struct execution_control_state
*ecs
)
2618 return ((!ecs
->handling_longjmp
2619 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2621 || ecs
->stepping_through_solib_after_catch
2622 || bpstat_should_step ());
2625 /* Subroutine call with source code we should not step over. Do step
2626 to the first line of code in it. */
2629 step_into_function (struct execution_control_state
*ecs
)
2632 struct symtab_and_line sr_sal
;
2634 s
= find_pc_symtab (stop_pc
);
2635 if (s
&& s
->language
!= language_asm
)
2636 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2638 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2639 /* Use the step_resume_break to step until the end of the prologue,
2640 even if that involves jumps (as it seems to on the vax under
2642 /* If the prologue ends in the middle of a source line, continue to
2643 the end of that source line (if it is still within the function).
2644 Otherwise, just go to end of prologue. */
2646 && ecs
->sal
.pc
!= ecs
->stop_func_start
2647 && ecs
->sal
.end
< ecs
->stop_func_end
)
2648 ecs
->stop_func_start
= ecs
->sal
.end
;
2650 /* Architectures which require breakpoint adjustment might not be able
2651 to place a breakpoint at the computed address. If so, the test
2652 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2653 ecs->stop_func_start to an address at which a breakpoint may be
2654 legitimately placed.
2656 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2657 made, GDB will enter an infinite loop when stepping through
2658 optimized code consisting of VLIW instructions which contain
2659 subinstructions corresponding to different source lines. On
2660 FR-V, it's not permitted to place a breakpoint on any but the
2661 first subinstruction of a VLIW instruction. When a breakpoint is
2662 set, GDB will adjust the breakpoint address to the beginning of
2663 the VLIW instruction. Thus, we need to make the corresponding
2664 adjustment here when computing the stop address. */
2666 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2668 ecs
->stop_func_start
2669 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2670 ecs
->stop_func_start
);
2673 if (ecs
->stop_func_start
== stop_pc
)
2675 /* We are already there: stop now. */
2677 print_stop_reason (END_STEPPING_RANGE
, 0);
2678 stop_stepping (ecs
);
2683 /* Put the step-breakpoint there and go until there. */
2684 init_sal (&sr_sal
); /* initialize to zeroes */
2685 sr_sal
.pc
= ecs
->stop_func_start
;
2686 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2688 /* Do not specify what the fp should be when we stop since on
2689 some machines the prologue is where the new fp value is
2691 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2693 /* And make sure stepping stops right away then. */
2694 step_range_end
= step_range_start
;
2699 /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID.
2700 This is used to both functions and to skip over code. */
2703 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
2704 struct frame_id sr_id
)
2706 /* There should never be more than one step-resume breakpoint per
2707 thread, so we should never be setting a new
2708 step_resume_breakpoint when one is already active. */
2709 gdb_assert (step_resume_breakpoint
== NULL
);
2710 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
2712 if (breakpoints_inserted
)
2713 insert_breakpoints ();
2716 /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used
2717 to skip a function (next, skip-no-debug) or signal. It's assumed
2718 that the function/signal handler being skipped eventually returns
2719 to the breakpoint inserted at RETURN_FRAME.pc.
2721 For the skip-function case, the function may have been reached by
2722 either single stepping a call / return / signal-return instruction,
2723 or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs
2724 to the skip-function's caller.
2726 For the signals case, this is called with the interrupted
2727 function's frame. The signal handler, when it returns, will resume
2728 the interrupted function at RETURN_FRAME.pc. */
2731 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
2733 struct symtab_and_line sr_sal
;
2735 init_sal (&sr_sal
); /* initialize to zeros */
2737 sr_sal
.pc
= ADDR_BITS_REMOVE (get_frame_pc (return_frame
));
2738 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2740 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
2744 stop_stepping (struct execution_control_state
*ecs
)
2747 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
2749 /* Let callers know we don't want to wait for the inferior anymore. */
2750 ecs
->wait_some_more
= 0;
2753 /* This function handles various cases where we need to continue
2754 waiting for the inferior. */
2755 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2758 keep_going (struct execution_control_state
*ecs
)
2760 /* Save the pc before execution, to compare with pc after stop. */
2761 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2763 /* If we did not do break;, it means we should keep running the
2764 inferior and not return to debugger. */
2766 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2768 /* We took a signal (which we are supposed to pass through to
2769 the inferior, else we'd have done a break above) and we
2770 haven't yet gotten our trap. Simply continue. */
2771 resume (currently_stepping (ecs
), stop_signal
);
2775 /* Either the trap was not expected, but we are continuing
2776 anyway (the user asked that this signal be passed to the
2779 The signal was SIGTRAP, e.g. it was our signal, but we
2780 decided we should resume from it.
2782 We're going to run this baby now! */
2784 if (!breakpoints_inserted
&& !ecs
->another_trap
)
2786 breakpoints_failed
= insert_breakpoints ();
2787 if (breakpoints_failed
)
2789 stop_stepping (ecs
);
2792 breakpoints_inserted
= 1;
2795 trap_expected
= ecs
->another_trap
;
2797 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2798 specifies that such a signal should be delivered to the
2801 Typically, this would occure when a user is debugging a
2802 target monitor on a simulator: the target monitor sets a
2803 breakpoint; the simulator encounters this break-point and
2804 halts the simulation handing control to GDB; GDB, noteing
2805 that the break-point isn't valid, returns control back to the
2806 simulator; the simulator then delivers the hardware
2807 equivalent of a SIGNAL_TRAP to the program being debugged. */
2809 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2810 stop_signal
= TARGET_SIGNAL_0
;
2813 resume (currently_stepping (ecs
), stop_signal
);
2816 prepare_to_wait (ecs
);
2819 /* This function normally comes after a resume, before
2820 handle_inferior_event exits. It takes care of any last bits of
2821 housekeeping, and sets the all-important wait_some_more flag. */
2824 prepare_to_wait (struct execution_control_state
*ecs
)
2827 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
2828 if (ecs
->infwait_state
== infwait_normal_state
)
2830 overlay_cache_invalid
= 1;
2832 /* We have to invalidate the registers BEFORE calling
2833 target_wait because they can be loaded from the target while
2834 in target_wait. This makes remote debugging a bit more
2835 efficient for those targets that provide critical registers
2836 as part of their normal status mechanism. */
2838 registers_changed ();
2839 ecs
->waiton_ptid
= pid_to_ptid (-1);
2840 ecs
->wp
= &(ecs
->ws
);
2842 /* This is the old end of the while loop. Let everybody know we
2843 want to wait for the inferior some more and get called again
2845 ecs
->wait_some_more
= 1;
2848 /* Print why the inferior has stopped. We always print something when
2849 the inferior exits, or receives a signal. The rest of the cases are
2850 dealt with later on in normal_stop() and print_it_typical(). Ideally
2851 there should be a call to this function from handle_inferior_event()
2852 each time stop_stepping() is called.*/
2854 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2856 switch (stop_reason
)
2859 /* We don't deal with these cases from handle_inferior_event()
2862 case END_STEPPING_RANGE
:
2863 /* We are done with a step/next/si/ni command. */
2864 /* For now print nothing. */
2865 /* Print a message only if not in the middle of doing a "step n"
2866 operation for n > 1 */
2867 if (!step_multi
|| !stop_step
)
2868 if (ui_out_is_mi_like_p (uiout
))
2869 ui_out_field_string (uiout
, "reason", "end-stepping-range");
2871 case BREAKPOINT_HIT
:
2872 /* We found a breakpoint. */
2873 /* For now print nothing. */
2876 /* The inferior was terminated by a signal. */
2877 annotate_signalled ();
2878 if (ui_out_is_mi_like_p (uiout
))
2879 ui_out_field_string (uiout
, "reason", "exited-signalled");
2880 ui_out_text (uiout
, "\nProgram terminated with signal ");
2881 annotate_signal_name ();
2882 ui_out_field_string (uiout
, "signal-name",
2883 target_signal_to_name (stop_info
));
2884 annotate_signal_name_end ();
2885 ui_out_text (uiout
, ", ");
2886 annotate_signal_string ();
2887 ui_out_field_string (uiout
, "signal-meaning",
2888 target_signal_to_string (stop_info
));
2889 annotate_signal_string_end ();
2890 ui_out_text (uiout
, ".\n");
2891 ui_out_text (uiout
, "The program no longer exists.\n");
2894 /* The inferior program is finished. */
2895 annotate_exited (stop_info
);
2898 if (ui_out_is_mi_like_p (uiout
))
2899 ui_out_field_string (uiout
, "reason", "exited");
2900 ui_out_text (uiout
, "\nProgram exited with code ");
2901 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2902 (unsigned int) stop_info
);
2903 ui_out_text (uiout
, ".\n");
2907 if (ui_out_is_mi_like_p (uiout
))
2908 ui_out_field_string (uiout
, "reason", "exited-normally");
2909 ui_out_text (uiout
, "\nProgram exited normally.\n");
2912 case SIGNAL_RECEIVED
:
2913 /* Signal received. The signal table tells us to print about
2916 ui_out_text (uiout
, "\nProgram received signal ");
2917 annotate_signal_name ();
2918 if (ui_out_is_mi_like_p (uiout
))
2919 ui_out_field_string (uiout
, "reason", "signal-received");
2920 ui_out_field_string (uiout
, "signal-name",
2921 target_signal_to_name (stop_info
));
2922 annotate_signal_name_end ();
2923 ui_out_text (uiout
, ", ");
2924 annotate_signal_string ();
2925 ui_out_field_string (uiout
, "signal-meaning",
2926 target_signal_to_string (stop_info
));
2927 annotate_signal_string_end ();
2928 ui_out_text (uiout
, ".\n");
2931 internal_error (__FILE__
, __LINE__
,
2932 _("print_stop_reason: unrecognized enum value"));
2938 /* Here to return control to GDB when the inferior stops for real.
2939 Print appropriate messages, remove breakpoints, give terminal our modes.
2941 STOP_PRINT_FRAME nonzero means print the executing frame
2942 (pc, function, args, file, line number and line text).
2943 BREAKPOINTS_FAILED nonzero means stop was due to error
2944 attempting to insert breakpoints. */
2949 struct target_waitstatus last
;
2952 get_last_target_status (&last_ptid
, &last
);
2954 /* As with the notification of thread events, we want to delay
2955 notifying the user that we've switched thread context until
2956 the inferior actually stops.
2958 There's no point in saying anything if the inferior has exited.
2959 Note that SIGNALLED here means "exited with a signal", not
2960 "received a signal". */
2961 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
2962 && target_has_execution
2963 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
2964 && last
.kind
!= TARGET_WAITKIND_EXITED
)
2966 target_terminal_ours_for_output ();
2967 printf_filtered (_("[Switching to %s]\n"),
2968 target_pid_or_tid_to_str (inferior_ptid
));
2969 previous_inferior_ptid
= inferior_ptid
;
2972 /* NOTE drow/2004-01-17: Is this still necessary? */
2973 /* Make sure that the current_frame's pc is correct. This
2974 is a correction for setting up the frame info before doing
2975 DECR_PC_AFTER_BREAK */
2976 if (target_has_execution
)
2977 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2978 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2979 frame code to check for this and sort out any resultant mess.
2980 DECR_PC_AFTER_BREAK needs to just go away. */
2981 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2983 if (target_has_execution
&& breakpoints_inserted
)
2985 if (remove_breakpoints ())
2987 target_terminal_ours_for_output ();
2988 printf_filtered (_("\
2989 Cannot remove breakpoints because program is no longer writable.\n\
2990 It might be running in another process.\n\
2991 Further execution is probably impossible.\n"));
2994 breakpoints_inserted
= 0;
2996 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2997 Delete any breakpoint that is to be deleted at the next stop. */
2999 breakpoint_auto_delete (stop_bpstat
);
3001 /* If an auto-display called a function and that got a signal,
3002 delete that auto-display to avoid an infinite recursion. */
3004 if (stopped_by_random_signal
)
3005 disable_current_display ();
3007 /* Don't print a message if in the middle of doing a "step n"
3008 operation for n > 1 */
3009 if (step_multi
&& stop_step
)
3012 target_terminal_ours ();
3014 /* Look up the hook_stop and run it (CLI internally handles problem
3015 of stop_command's pre-hook not existing). */
3017 catch_errors (hook_stop_stub
, stop_command
,
3018 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3020 if (!target_has_stack
)
3026 /* Select innermost stack frame - i.e., current frame is frame 0,
3027 and current location is based on that.
3028 Don't do this on return from a stack dummy routine,
3029 or if the program has exited. */
3031 if (!stop_stack_dummy
)
3033 select_frame (get_current_frame ());
3035 /* Print current location without a level number, if
3036 we have changed functions or hit a breakpoint.
3037 Print source line if we have one.
3038 bpstat_print() contains the logic deciding in detail
3039 what to print, based on the event(s) that just occurred. */
3041 if (stop_print_frame
&& deprecated_selected_frame
)
3045 int do_frame_printing
= 1;
3047 bpstat_ret
= bpstat_print (stop_bpstat
);
3051 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3052 (or should) carry around the function and does (or
3053 should) use that when doing a frame comparison. */
3055 && frame_id_eq (step_frame_id
,
3056 get_frame_id (get_current_frame ()))
3057 && step_start_function
== find_pc_function (stop_pc
))
3058 source_flag
= SRC_LINE
; /* finished step, just print source line */
3060 source_flag
= SRC_AND_LOC
; /* print location and source line */
3062 case PRINT_SRC_AND_LOC
:
3063 source_flag
= SRC_AND_LOC
; /* print location and source line */
3065 case PRINT_SRC_ONLY
:
3066 source_flag
= SRC_LINE
;
3069 source_flag
= SRC_LINE
; /* something bogus */
3070 do_frame_printing
= 0;
3073 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3075 /* For mi, have the same behavior every time we stop:
3076 print everything but the source line. */
3077 if (ui_out_is_mi_like_p (uiout
))
3078 source_flag
= LOC_AND_ADDRESS
;
3080 if (ui_out_is_mi_like_p (uiout
))
3081 ui_out_field_int (uiout
, "thread-id",
3082 pid_to_thread_id (inferior_ptid
));
3083 /* The behavior of this routine with respect to the source
3085 SRC_LINE: Print only source line
3086 LOCATION: Print only location
3087 SRC_AND_LOC: Print location and source line */
3088 if (do_frame_printing
)
3089 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3091 /* Display the auto-display expressions. */
3096 /* Save the function value return registers, if we care.
3097 We might be about to restore their previous contents. */
3098 if (proceed_to_finish
)
3099 /* NB: The copy goes through to the target picking up the value of
3100 all the registers. */
3101 regcache_cpy (stop_registers
, current_regcache
);
3103 if (stop_stack_dummy
)
3105 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3106 ends with a setting of the current frame, so we can use that
3108 frame_pop (get_current_frame ());
3109 /* Set stop_pc to what it was before we called the function.
3110 Can't rely on restore_inferior_status because that only gets
3111 called if we don't stop in the called function. */
3112 stop_pc
= read_pc ();
3113 select_frame (get_current_frame ());
3117 annotate_stopped ();
3118 observer_notify_normal_stop (stop_bpstat
);
3122 hook_stop_stub (void *cmd
)
3124 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3129 signal_stop_state (int signo
)
3131 return signal_stop
[signo
];
3135 signal_print_state (int signo
)
3137 return signal_print
[signo
];
3141 signal_pass_state (int signo
)
3143 return signal_program
[signo
];
3147 signal_stop_update (int signo
, int state
)
3149 int ret
= signal_stop
[signo
];
3150 signal_stop
[signo
] = state
;
3155 signal_print_update (int signo
, int state
)
3157 int ret
= signal_print
[signo
];
3158 signal_print
[signo
] = state
;
3163 signal_pass_update (int signo
, int state
)
3165 int ret
= signal_program
[signo
];
3166 signal_program
[signo
] = state
;
3171 sig_print_header (void)
3173 printf_filtered (_("\
3174 Signal Stop\tPrint\tPass to program\tDescription\n"));
3178 sig_print_info (enum target_signal oursig
)
3180 char *name
= target_signal_to_name (oursig
);
3181 int name_padding
= 13 - strlen (name
);
3183 if (name_padding
<= 0)
3186 printf_filtered ("%s", name
);
3187 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3188 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3189 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3190 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3191 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3194 /* Specify how various signals in the inferior should be handled. */
3197 handle_command (char *args
, int from_tty
)
3200 int digits
, wordlen
;
3201 int sigfirst
, signum
, siglast
;
3202 enum target_signal oursig
;
3205 unsigned char *sigs
;
3206 struct cleanup
*old_chain
;
3210 error_no_arg (_("signal to handle"));
3213 /* Allocate and zero an array of flags for which signals to handle. */
3215 nsigs
= (int) TARGET_SIGNAL_LAST
;
3216 sigs
= (unsigned char *) alloca (nsigs
);
3217 memset (sigs
, 0, nsigs
);
3219 /* Break the command line up into args. */
3221 argv
= buildargv (args
);
3226 old_chain
= make_cleanup_freeargv (argv
);
3228 /* Walk through the args, looking for signal oursigs, signal names, and
3229 actions. Signal numbers and signal names may be interspersed with
3230 actions, with the actions being performed for all signals cumulatively
3231 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3233 while (*argv
!= NULL
)
3235 wordlen
= strlen (*argv
);
3236 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3240 sigfirst
= siglast
= -1;
3242 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3244 /* Apply action to all signals except those used by the
3245 debugger. Silently skip those. */
3248 siglast
= nsigs
- 1;
3250 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3252 SET_SIGS (nsigs
, sigs
, signal_stop
);
3253 SET_SIGS (nsigs
, sigs
, signal_print
);
3255 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3257 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3259 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3261 SET_SIGS (nsigs
, sigs
, signal_print
);
3263 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3265 SET_SIGS (nsigs
, sigs
, signal_program
);
3267 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3269 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3271 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3273 SET_SIGS (nsigs
, sigs
, signal_program
);
3275 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3277 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3278 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3280 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3282 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3284 else if (digits
> 0)
3286 /* It is numeric. The numeric signal refers to our own
3287 internal signal numbering from target.h, not to host/target
3288 signal number. This is a feature; users really should be
3289 using symbolic names anyway, and the common ones like
3290 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3292 sigfirst
= siglast
= (int)
3293 target_signal_from_command (atoi (*argv
));
3294 if ((*argv
)[digits
] == '-')
3297 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3299 if (sigfirst
> siglast
)
3301 /* Bet he didn't figure we'd think of this case... */
3309 oursig
= target_signal_from_name (*argv
);
3310 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3312 sigfirst
= siglast
= (int) oursig
;
3316 /* Not a number and not a recognized flag word => complain. */
3317 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
3321 /* If any signal numbers or symbol names were found, set flags for
3322 which signals to apply actions to. */
3324 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3326 switch ((enum target_signal
) signum
)
3328 case TARGET_SIGNAL_TRAP
:
3329 case TARGET_SIGNAL_INT
:
3330 if (!allsigs
&& !sigs
[signum
])
3332 if (query ("%s is used by the debugger.\n\
3333 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3339 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3340 gdb_flush (gdb_stdout
);
3344 case TARGET_SIGNAL_0
:
3345 case TARGET_SIGNAL_DEFAULT
:
3346 case TARGET_SIGNAL_UNKNOWN
:
3347 /* Make sure that "all" doesn't print these. */
3358 target_notice_signals (inferior_ptid
);
3362 /* Show the results. */
3363 sig_print_header ();
3364 for (signum
= 0; signum
< nsigs
; signum
++)
3368 sig_print_info (signum
);
3373 do_cleanups (old_chain
);
3377 xdb_handle_command (char *args
, int from_tty
)
3380 struct cleanup
*old_chain
;
3382 /* Break the command line up into args. */
3384 argv
= buildargv (args
);
3389 old_chain
= make_cleanup_freeargv (argv
);
3390 if (argv
[1] != (char *) NULL
)
3395 bufLen
= strlen (argv
[0]) + 20;
3396 argBuf
= (char *) xmalloc (bufLen
);
3400 enum target_signal oursig
;
3402 oursig
= target_signal_from_name (argv
[0]);
3403 memset (argBuf
, 0, bufLen
);
3404 if (strcmp (argv
[1], "Q") == 0)
3405 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3408 if (strcmp (argv
[1], "s") == 0)
3410 if (!signal_stop
[oursig
])
3411 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3413 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3415 else if (strcmp (argv
[1], "i") == 0)
3417 if (!signal_program
[oursig
])
3418 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3420 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3422 else if (strcmp (argv
[1], "r") == 0)
3424 if (!signal_print
[oursig
])
3425 sprintf (argBuf
, "%s %s", argv
[0], "print");
3427 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3433 handle_command (argBuf
, from_tty
);
3435 printf_filtered (_("Invalid signal handling flag.\n"));
3440 do_cleanups (old_chain
);
3443 /* Print current contents of the tables set by the handle command.
3444 It is possible we should just be printing signals actually used
3445 by the current target (but for things to work right when switching
3446 targets, all signals should be in the signal tables). */
3449 signals_info (char *signum_exp
, int from_tty
)
3451 enum target_signal oursig
;
3452 sig_print_header ();
3456 /* First see if this is a symbol name. */
3457 oursig
= target_signal_from_name (signum_exp
);
3458 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3460 /* No, try numeric. */
3462 target_signal_from_command (parse_and_eval_long (signum_exp
));
3464 sig_print_info (oursig
);
3468 printf_filtered ("\n");
3469 /* These ugly casts brought to you by the native VAX compiler. */
3470 for (oursig
= TARGET_SIGNAL_FIRST
;
3471 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3472 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3476 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3477 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3478 sig_print_info (oursig
);
3481 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3484 struct inferior_status
3486 enum target_signal stop_signal
;
3490 int stop_stack_dummy
;
3491 int stopped_by_random_signal
;
3493 CORE_ADDR step_range_start
;
3494 CORE_ADDR step_range_end
;
3495 struct frame_id step_frame_id
;
3496 enum step_over_calls_kind step_over_calls
;
3497 CORE_ADDR step_resume_break_address
;
3498 int stop_after_trap
;
3500 struct regcache
*stop_registers
;
3502 /* These are here because if call_function_by_hand has written some
3503 registers and then decides to call error(), we better not have changed
3505 struct regcache
*registers
;
3507 /* A frame unique identifier. */
3508 struct frame_id selected_frame_id
;
3510 int breakpoint_proceeded
;
3511 int restore_stack_info
;
3512 int proceed_to_finish
;
3516 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3519 int size
= register_size (current_gdbarch
, regno
);
3520 void *buf
= alloca (size
);
3521 store_signed_integer (buf
, size
, val
);
3522 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3525 /* Save all of the information associated with the inferior<==>gdb
3526 connection. INF_STATUS is a pointer to a "struct inferior_status"
3527 (defined in inferior.h). */
3529 struct inferior_status
*
3530 save_inferior_status (int restore_stack_info
)
3532 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3534 inf_status
->stop_signal
= stop_signal
;
3535 inf_status
->stop_pc
= stop_pc
;
3536 inf_status
->stop_step
= stop_step
;
3537 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3538 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3539 inf_status
->trap_expected
= trap_expected
;
3540 inf_status
->step_range_start
= step_range_start
;
3541 inf_status
->step_range_end
= step_range_end
;
3542 inf_status
->step_frame_id
= step_frame_id
;
3543 inf_status
->step_over_calls
= step_over_calls
;
3544 inf_status
->stop_after_trap
= stop_after_trap
;
3545 inf_status
->stop_soon
= stop_soon
;
3546 /* Save original bpstat chain here; replace it with copy of chain.
3547 If caller's caller is walking the chain, they'll be happier if we
3548 hand them back the original chain when restore_inferior_status is
3550 inf_status
->stop_bpstat
= stop_bpstat
;
3551 stop_bpstat
= bpstat_copy (stop_bpstat
);
3552 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3553 inf_status
->restore_stack_info
= restore_stack_info
;
3554 inf_status
->proceed_to_finish
= proceed_to_finish
;
3556 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3558 inf_status
->registers
= regcache_dup (current_regcache
);
3560 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3565 restore_selected_frame (void *args
)
3567 struct frame_id
*fid
= (struct frame_id
*) args
;
3568 struct frame_info
*frame
;
3570 frame
= frame_find_by_id (*fid
);
3572 /* If inf_status->selected_frame_id is NULL, there was no previously
3576 warning (_("Unable to restore previously selected frame."));
3580 select_frame (frame
);
3586 restore_inferior_status (struct inferior_status
*inf_status
)
3588 stop_signal
= inf_status
->stop_signal
;
3589 stop_pc
= inf_status
->stop_pc
;
3590 stop_step
= inf_status
->stop_step
;
3591 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3592 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3593 trap_expected
= inf_status
->trap_expected
;
3594 step_range_start
= inf_status
->step_range_start
;
3595 step_range_end
= inf_status
->step_range_end
;
3596 step_frame_id
= inf_status
->step_frame_id
;
3597 step_over_calls
= inf_status
->step_over_calls
;
3598 stop_after_trap
= inf_status
->stop_after_trap
;
3599 stop_soon
= inf_status
->stop_soon
;
3600 bpstat_clear (&stop_bpstat
);
3601 stop_bpstat
= inf_status
->stop_bpstat
;
3602 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3603 proceed_to_finish
= inf_status
->proceed_to_finish
;
3605 /* FIXME: Is the restore of stop_registers always needed. */
3606 regcache_xfree (stop_registers
);
3607 stop_registers
= inf_status
->stop_registers
;
3609 /* The inferior can be gone if the user types "print exit(0)"
3610 (and perhaps other times). */
3611 if (target_has_execution
)
3612 /* NB: The register write goes through to the target. */
3613 regcache_cpy (current_regcache
, inf_status
->registers
);
3614 regcache_xfree (inf_status
->registers
);
3616 /* FIXME: If we are being called after stopping in a function which
3617 is called from gdb, we should not be trying to restore the
3618 selected frame; it just prints a spurious error message (The
3619 message is useful, however, in detecting bugs in gdb (like if gdb
3620 clobbers the stack)). In fact, should we be restoring the
3621 inferior status at all in that case? . */
3623 if (target_has_stack
&& inf_status
->restore_stack_info
)
3625 /* The point of catch_errors is that if the stack is clobbered,
3626 walking the stack might encounter a garbage pointer and
3627 error() trying to dereference it. */
3629 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3630 "Unable to restore previously selected frame:\n",
3631 RETURN_MASK_ERROR
) == 0)
3632 /* Error in restoring the selected frame. Select the innermost
3634 select_frame (get_current_frame ());
3642 do_restore_inferior_status_cleanup (void *sts
)
3644 restore_inferior_status (sts
);
3648 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3650 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3654 discard_inferior_status (struct inferior_status
*inf_status
)
3656 /* See save_inferior_status for info on stop_bpstat. */
3657 bpstat_clear (&inf_status
->stop_bpstat
);
3658 regcache_xfree (inf_status
->registers
);
3659 regcache_xfree (inf_status
->stop_registers
);
3664 inferior_has_forked (int pid
, int *child_pid
)
3666 struct target_waitstatus last
;
3669 get_last_target_status (&last_ptid
, &last
);
3671 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3674 if (ptid_get_pid (last_ptid
) != pid
)
3677 *child_pid
= last
.value
.related_pid
;
3682 inferior_has_vforked (int pid
, int *child_pid
)
3684 struct target_waitstatus last
;
3687 get_last_target_status (&last_ptid
, &last
);
3689 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3692 if (ptid_get_pid (last_ptid
) != pid
)
3695 *child_pid
= last
.value
.related_pid
;
3700 inferior_has_execd (int pid
, char **execd_pathname
)
3702 struct target_waitstatus last
;
3705 get_last_target_status (&last_ptid
, &last
);
3707 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3710 if (ptid_get_pid (last_ptid
) != pid
)
3713 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3717 /* Oft used ptids */
3719 ptid_t minus_one_ptid
;
3721 /* Create a ptid given the necessary PID, LWP, and TID components. */
3724 ptid_build (int pid
, long lwp
, long tid
)
3734 /* Create a ptid from just a pid. */
3737 pid_to_ptid (int pid
)
3739 return ptid_build (pid
, 0, 0);
3742 /* Fetch the pid (process id) component from a ptid. */
3745 ptid_get_pid (ptid_t ptid
)
3750 /* Fetch the lwp (lightweight process) component from a ptid. */
3753 ptid_get_lwp (ptid_t ptid
)
3758 /* Fetch the tid (thread id) component from a ptid. */
3761 ptid_get_tid (ptid_t ptid
)
3766 /* ptid_equal() is used to test equality of two ptids. */
3769 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3771 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3772 && ptid1
.tid
== ptid2
.tid
);
3775 /* restore_inferior_ptid() will be used by the cleanup machinery
3776 to restore the inferior_ptid value saved in a call to
3777 save_inferior_ptid(). */
3780 restore_inferior_ptid (void *arg
)
3782 ptid_t
*saved_ptid_ptr
= arg
;
3783 inferior_ptid
= *saved_ptid_ptr
;
3787 /* Save the value of inferior_ptid so that it may be restored by a
3788 later call to do_cleanups(). Returns the struct cleanup pointer
3789 needed for later doing the cleanup. */
3792 save_inferior_ptid (void)
3794 ptid_t
*saved_ptid_ptr
;
3796 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3797 *saved_ptid_ptr
= inferior_ptid
;
3798 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3805 stop_registers
= regcache_xmalloc (current_gdbarch
);
3809 _initialize_infrun (void)
3813 struct cmd_list_element
*c
;
3815 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers
);
3816 deprecated_register_gdbarch_swap (NULL
, 0, build_infrun
);
3818 add_info ("signals", signals_info
, _("\
3819 What debugger does when program gets various signals.\n\
3820 Specify a signal as argument to print info on that signal only."));
3821 add_info_alias ("handle", "signals", 0);
3823 add_com ("handle", class_run
, handle_command
, _("\
3824 Specify how to handle a signal.\n\
3825 Args are signals and actions to apply to those signals.\n\
3826 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3827 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3828 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3829 The special arg \"all\" is recognized to mean all signals except those\n\
3830 used by the debugger, typically SIGTRAP and SIGINT.\n\
3831 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3832 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3833 Stop means reenter debugger if this signal happens (implies print).\n\
3834 Print means print a message if this signal happens.\n\
3835 Pass means let program see this signal; otherwise program doesn't know.\n\
3836 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3837 Pass and Stop may be combined."));
3840 add_com ("lz", class_info
, signals_info
, _("\
3841 What debugger does when program gets various signals.\n\
3842 Specify a signal as argument to print info on that signal only."));
3843 add_com ("z", class_run
, xdb_handle_command
, _("\
3844 Specify how to handle a signal.\n\
3845 Args are signals and actions to apply to those signals.\n\
3846 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3847 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3848 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3849 The special arg \"all\" is recognized to mean all signals except those\n\
3850 used by the debugger, typically SIGTRAP and SIGINT.\n\
3851 Recognized actions include \"s\" (toggles between stop and nostop), \n\
3852 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3853 nopass), \"Q\" (noprint)\n\
3854 Stop means reenter debugger if this signal happens (implies print).\n\
3855 Print means print a message if this signal happens.\n\
3856 Pass means let program see this signal; otherwise program doesn't know.\n\
3857 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3858 Pass and Stop may be combined."));
3862 stop_command
= add_cmd ("stop", class_obscure
,
3863 not_just_help_class_command
, _("\
3864 There is no `stop' command, but you can set a hook on `stop'.\n\
3865 This allows you to set a list of commands to be run each time execution\n\
3866 of the program stops."), &cmdlist
);
3868 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
3869 Set inferior debugging."), _("\
3870 Show inferior debugging."), _("\
3871 When non-zero, inferior specific debugging is enabled."),
3874 &setdebuglist
, &showdebuglist
);
3876 numsigs
= (int) TARGET_SIGNAL_LAST
;
3877 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3878 signal_print
= (unsigned char *)
3879 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3880 signal_program
= (unsigned char *)
3881 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3882 for (i
= 0; i
< numsigs
; i
++)
3885 signal_print
[i
] = 1;
3886 signal_program
[i
] = 1;
3889 /* Signals caused by debugger's own actions
3890 should not be given to the program afterwards. */
3891 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3892 signal_program
[TARGET_SIGNAL_INT
] = 0;
3894 /* Signals that are not errors should not normally enter the debugger. */
3895 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3896 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3897 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3898 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3899 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3900 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3901 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3902 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3903 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3904 signal_print
[TARGET_SIGNAL_IO
] = 0;
3905 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3906 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3907 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3908 signal_print
[TARGET_SIGNAL_URG
] = 0;
3909 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
3910 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
3912 /* These signals are used internally by user-level thread
3913 implementations. (See signal(5) on Solaris.) Like the above
3914 signals, a healthy program receives and handles them as part of
3915 its normal operation. */
3916 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
3917 signal_print
[TARGET_SIGNAL_LWP
] = 0;
3918 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
3919 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
3920 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
3921 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
3924 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
3925 &stop_on_solib_events
, _("\
3926 Set stopping for shared library events."), _("\
3927 Show stopping for shared library events."), _("\
3928 If nonzero, gdb will give control to the user when the dynamic linker\n\
3929 notifies gdb of shared library events. The most common event of interest\n\
3930 to the user would be loading/unloading of a new library."),
3932 show_stop_on_solib_events
,
3933 &setlist
, &showlist
);
3936 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
3937 follow_fork_mode_kind_names
,
3938 &follow_fork_mode_string
, _("\
3939 Set debugger response to a program call of fork or vfork."), _("\
3940 Show debugger response to a program call of fork or vfork."), _("\
3941 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3942 parent - the original process is debugged after a fork\n\
3943 child - the new process is debugged after a fork\n\
3944 The unfollowed process will continue to run.\n\
3945 By default, the debugger will follow the parent process."),
3947 show_follow_fork_mode_string
,
3948 &setlist
, &showlist
);
3950 add_setshow_enum_cmd ("scheduler-locking", class_run
,
3951 scheduler_enums
, &scheduler_mode
, _("\
3952 Set mode for locking scheduler during execution."), _("\
3953 Show mode for locking scheduler during execution."), _("\
3954 off == no locking (threads may preempt at any time)\n\
3955 on == full locking (no thread except the current thread may run)\n\
3956 step == scheduler locked during every single-step operation.\n\
3957 In this mode, no other thread may run during a step command.\n\
3958 Other threads may run while stepping over a function call ('next')."),
3959 set_schedlock_func
, /* traps on target vector */
3960 show_scheduler_mode
,
3961 &setlist
, &showlist
);
3963 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
3964 Set mode of the step operation."), _("\
3965 Show mode of the step operation."), _("\
3966 When set, doing a step over a function without debug line information\n\
3967 will stop at the first instruction of that function. Otherwise, the\n\
3968 function is skipped and the step command stops at a different source line."),
3970 show_step_stop_if_no_debug
,
3971 &setlist
, &showlist
);
3973 /* ptid initializations */
3974 null_ptid
= ptid_build (0, 0, 0);
3975 minus_one_ptid
= ptid_build (-1, 0, 0);
3976 inferior_ptid
= null_ptid
;
3977 target_last_wait_ptid
= minus_one_ptid
;