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 "breakpoint.h"
35 #include "cli/cli-script.h"
37 #include "gdbthread.h"
47 #include "gdb_assert.h"
49 /* Prototypes for local functions */
51 static void signals_info (char *, int);
53 static void handle_command (char *, int);
55 static void sig_print_info (enum target_signal
);
57 static void sig_print_header (void);
59 static void resume_cleanups (void *);
61 static int hook_stop_stub (void *);
63 static int restore_selected_frame (void *);
65 static void build_infrun (void);
67 static int follow_fork (void);
69 static void set_schedlock_func (char *args
, int from_tty
,
70 struct cmd_list_element
*c
);
72 struct execution_control_state
;
74 static int currently_stepping (struct execution_control_state
*ecs
);
76 static void xdb_handle_command (char *args
, int from_tty
);
78 static int prepare_to_proceed (void);
80 void _initialize_infrun (void);
82 int inferior_ignoring_startup_exec_events
= 0;
83 int inferior_ignoring_leading_exec_events
= 0;
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug
= 0;
90 /* In asynchronous mode, but simulating synchronous execution. */
92 int sync_execution
= 0;
94 /* wait_for_inferior and normal_stop use this to notify the user
95 when the inferior stopped in a different thread than it had been
98 static ptid_t previous_inferior_ptid
;
100 /* This is true for configurations that may follow through execl() and
101 similar functions. At present this is only true for HP-UX native. */
103 #ifndef MAY_FOLLOW_EXEC
104 #define MAY_FOLLOW_EXEC (0)
107 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
109 /* If the program uses ELF-style shared libraries, then calls to
110 functions in shared libraries go through stubs, which live in a
111 table called the PLT (Procedure Linkage Table). The first time the
112 function is called, the stub sends control to the dynamic linker,
113 which looks up the function's real address, patches the stub so
114 that future calls will go directly to the function, and then passes
115 control to the function.
117 If we are stepping at the source level, we don't want to see any of
118 this --- we just want to skip over the stub and the dynamic linker.
119 The simple approach is to single-step until control leaves the
122 However, on some systems (e.g., Red Hat's 5.2 distribution) the
123 dynamic linker calls functions in the shared C library, so you
124 can't tell from the PC alone whether the dynamic linker is still
125 running. In this case, we use a step-resume breakpoint to get us
126 past the dynamic linker, as if we were using "next" to step over a
129 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
130 linker code or not. Normally, this means we single-step. However,
131 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
132 address where we can place a step-resume breakpoint to get past the
133 linker's symbol resolution function.
135 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
136 pretty portable way, by comparing the PC against the address ranges
137 of the dynamic linker's sections.
139 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
140 it depends on internal details of the dynamic linker. It's usually
141 not too hard to figure out where to put a breakpoint, but it
142 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
143 sanity checking. If it can't figure things out, returning zero and
144 getting the (possibly confusing) stepping behavior is better than
145 signalling an error, which will obscure the change in the
148 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
149 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
152 /* This function returns TRUE if pc is the address of an instruction
153 that lies within the dynamic linker (such as the event hook, or the
156 This function must be used only when a dynamic linker event has
157 been caught, and the inferior is being stepped out of the hook, or
158 undefined results are guaranteed. */
160 #ifndef SOLIB_IN_DYNAMIC_LINKER
161 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
164 /* On MIPS16, a function that returns a floating point value may call
165 a library helper function to copy the return value to a floating point
166 register. The IGNORE_HELPER_CALL macro returns non-zero if we
167 should ignore (i.e. step over) this function call. */
168 #ifndef IGNORE_HELPER_CALL
169 #define IGNORE_HELPER_CALL(pc) 0
172 /* On some systems, the PC may be left pointing at an instruction that won't
173 actually be executed. This is usually indicated by a bit in the PSW. If
174 we find ourselves in such a state, then we step the target beyond the
175 nullified instruction before returning control to the user so as to avoid
178 #ifndef INSTRUCTION_NULLIFIED
179 #define INSTRUCTION_NULLIFIED 0
182 /* We can't step off a permanent breakpoint in the ordinary way, because we
183 can't remove it. Instead, we have to advance the PC to the next
184 instruction. This macro should expand to a pointer to a function that
185 does that, or zero if we have no such function. If we don't have a
186 definition for it, we have to report an error. */
187 #ifndef SKIP_PERMANENT_BREAKPOINT
188 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
190 default_skip_permanent_breakpoint (void)
193 The program is stopped at a permanent breakpoint, but GDB does not know\n\
194 how to step past a permanent breakpoint on this architecture. Try using\n\
195 a command like `return' or `jump' to continue execution.");
200 /* Convert the #defines into values. This is temporary until wfi control
201 flow is completely sorted out. */
203 #ifndef HAVE_STEPPABLE_WATCHPOINT
204 #define HAVE_STEPPABLE_WATCHPOINT 0
206 #undef HAVE_STEPPABLE_WATCHPOINT
207 #define HAVE_STEPPABLE_WATCHPOINT 1
210 #ifndef CANNOT_STEP_HW_WATCHPOINTS
211 #define CANNOT_STEP_HW_WATCHPOINTS 0
213 #undef CANNOT_STEP_HW_WATCHPOINTS
214 #define CANNOT_STEP_HW_WATCHPOINTS 1
217 /* Tables of how to react to signals; the user sets them. */
219 static unsigned char *signal_stop
;
220 static unsigned char *signal_print
;
221 static unsigned char *signal_program
;
223 #define SET_SIGS(nsigs,sigs,flags) \
225 int signum = (nsigs); \
226 while (signum-- > 0) \
227 if ((sigs)[signum]) \
228 (flags)[signum] = 1; \
231 #define UNSET_SIGS(nsigs,sigs,flags) \
233 int signum = (nsigs); \
234 while (signum-- > 0) \
235 if ((sigs)[signum]) \
236 (flags)[signum] = 0; \
239 /* Value to pass to target_resume() to cause all threads to resume */
241 #define RESUME_ALL (pid_to_ptid (-1))
243 /* Command list pointer for the "stop" placeholder. */
245 static struct cmd_list_element
*stop_command
;
247 /* Nonzero if breakpoints are now inserted in the inferior. */
249 static int breakpoints_inserted
;
251 /* Function inferior was in as of last step command. */
253 static struct symbol
*step_start_function
;
255 /* Nonzero if we are expecting a trace trap and should proceed from it. */
257 static int trap_expected
;
260 /* Nonzero if we want to give control to the user when we're notified
261 of shared library events by the dynamic linker. */
262 static int stop_on_solib_events
;
266 /* Nonzero if the next time we try to continue the inferior, it will
267 step one instruction and generate a spurious trace trap.
268 This is used to compensate for a bug in HP-UX. */
270 static int trap_expected_after_continue
;
273 /* Nonzero means expecting a trace trap
274 and should stop the inferior and return silently when it happens. */
278 /* Nonzero means expecting a trap and caller will handle it themselves.
279 It is used after attach, due to attaching to a process;
280 when running in the shell before the child program has been exec'd;
281 and when running some kinds of remote stuff (FIXME?). */
283 enum stop_kind stop_soon
;
285 /* Nonzero if proceed is being used for a "finish" command or a similar
286 situation when stop_registers should be saved. */
288 int proceed_to_finish
;
290 /* Save register contents here when about to pop a stack dummy frame,
291 if-and-only-if proceed_to_finish is set.
292 Thus this contains the return value from the called function (assuming
293 values are returned in a register). */
295 struct regcache
*stop_registers
;
297 /* Nonzero if program stopped due to error trying to insert breakpoints. */
299 static int breakpoints_failed
;
301 /* Nonzero after stop if current stack frame should be printed. */
303 static int stop_print_frame
;
305 static struct breakpoint
*step_resume_breakpoint
= NULL
;
307 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
308 interactions with an inferior that is running a kernel function
309 (aka, a system call or "syscall"). wait_for_inferior therefore
310 may have a need to know when the inferior is in a syscall. This
311 is a count of the number of inferior threads which are known to
312 currently be running in a syscall. */
313 static int number_of_threads_in_syscalls
;
315 /* This is a cached copy of the pid/waitstatus of the last event
316 returned by target_wait()/deprecated_target_wait_hook(). This
317 information is returned by get_last_target_status(). */
318 static ptid_t target_last_wait_ptid
;
319 static struct target_waitstatus target_last_waitstatus
;
321 /* This is used to remember when a fork, vfork or exec event
322 was caught by a catchpoint, and thus the event is to be
323 followed at the next resume of the inferior, and not
327 enum target_waitkind kind
;
334 char *execd_pathname
;
338 static const char follow_fork_mode_child
[] = "child";
339 static const char follow_fork_mode_parent
[] = "parent";
341 static const char *follow_fork_mode_kind_names
[] = {
342 follow_fork_mode_child
,
343 follow_fork_mode_parent
,
347 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
353 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
355 return target_follow_fork (follow_child
);
359 follow_inferior_reset_breakpoints (void)
361 /* Was there a step_resume breakpoint? (There was if the user
362 did a "next" at the fork() call.) If so, explicitly reset its
365 step_resumes are a form of bp that are made to be per-thread.
366 Since we created the step_resume bp when the parent process
367 was being debugged, and now are switching to the child process,
368 from the breakpoint package's viewpoint, that's a switch of
369 "threads". We must update the bp's notion of which thread
370 it is for, or it'll be ignored when it triggers. */
372 if (step_resume_breakpoint
)
373 breakpoint_re_set_thread (step_resume_breakpoint
);
375 /* Reinsert all breakpoints in the child. The user may have set
376 breakpoints after catching the fork, in which case those
377 were never set in the child, but only in the parent. This makes
378 sure the inserted breakpoints match the breakpoint list. */
380 breakpoint_re_set ();
381 insert_breakpoints ();
384 /* EXECD_PATHNAME is assumed to be non-NULL. */
387 follow_exec (int pid
, char *execd_pathname
)
390 struct target_ops
*tgt
;
392 if (!may_follow_exec
)
395 /* This is an exec event that we actually wish to pay attention to.
396 Refresh our symbol table to the newly exec'd program, remove any
399 If there are breakpoints, they aren't really inserted now,
400 since the exec() transformed our inferior into a fresh set
403 We want to preserve symbolic breakpoints on the list, since
404 we have hopes that they can be reset after the new a.out's
405 symbol table is read.
407 However, any "raw" breakpoints must be removed from the list
408 (e.g., the solib bp's), since their address is probably invalid
411 And, we DON'T want to call delete_breakpoints() here, since
412 that may write the bp's "shadow contents" (the instruction
413 value that was overwritten witha TRAP instruction). Since
414 we now have a new a.out, those shadow contents aren't valid. */
415 update_breakpoints_after_exec ();
417 /* If there was one, it's gone now. We cannot truly step-to-next
418 statement through an exec(). */
419 step_resume_breakpoint
= NULL
;
420 step_range_start
= 0;
423 /* What is this a.out's name? */
424 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
426 /* We've followed the inferior through an exec. Therefore, the
427 inferior has essentially been killed & reborn. */
429 /* First collect the run target in effect. */
430 tgt
= find_run_target ();
431 /* If we can't find one, things are in a very strange state... */
433 error ("Could find run target to save before following exec");
435 gdb_flush (gdb_stdout
);
436 target_mourn_inferior ();
437 inferior_ptid
= pid_to_ptid (saved_pid
);
438 /* Because mourn_inferior resets inferior_ptid. */
441 /* That a.out is now the one to use. */
442 exec_file_attach (execd_pathname
, 0);
444 /* And also is where symbols can be found. */
445 symbol_file_add_main (execd_pathname
, 0);
447 /* Reset the shared library package. This ensures that we get
448 a shlib event when the child reaches "_start", at which point
449 the dld will have had a chance to initialize the child. */
450 #if defined(SOLIB_RESTART)
453 #ifdef SOLIB_CREATE_INFERIOR_HOOK
454 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
457 /* Reinsert all breakpoints. (Those which were symbolic have
458 been reset to the proper address in the new a.out, thanks
459 to symbol_file_command...) */
460 insert_breakpoints ();
462 /* The next resume of this inferior should bring it to the shlib
463 startup breakpoints. (If the user had also set bp's on
464 "main" from the old (parent) process, then they'll auto-
465 matically get reset there in the new process.) */
468 /* Non-zero if we just simulating a single-step. This is needed
469 because we cannot remove the breakpoints in the inferior process
470 until after the `wait' in `wait_for_inferior'. */
471 static int singlestep_breakpoints_inserted_p
= 0;
473 /* The thread we inserted single-step breakpoints for. */
474 static ptid_t singlestep_ptid
;
476 /* If another thread hit the singlestep breakpoint, we save the original
477 thread here so that we can resume single-stepping it later. */
478 static ptid_t saved_singlestep_ptid
;
479 static int stepping_past_singlestep_breakpoint
;
482 /* Things to clean up if we QUIT out of resume (). */
484 resume_cleanups (void *ignore
)
489 static const char schedlock_off
[] = "off";
490 static const char schedlock_on
[] = "on";
491 static const char schedlock_step
[] = "step";
492 static const char *scheduler_mode
= schedlock_off
;
493 static const char *scheduler_enums
[] = {
501 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
503 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
504 the set command passed as a parameter. The clone operation will
505 include (BUG?) any ``set'' command callback, if present.
506 Commands like ``info set'' call all the ``show'' command
507 callbacks. Unfortunately, for ``show'' commands cloned from
508 ``set'', this includes callbacks belonging to ``set'' commands.
509 Making this worse, this only occures if add_show_from_set() is
510 called after add_cmd_sfunc() (BUG?). */
511 if (cmd_type (c
) == set_cmd
)
512 if (!target_can_lock_scheduler
)
514 scheduler_mode
= schedlock_off
;
515 error ("Target '%s' cannot support this command.", target_shortname
);
520 /* Resume the inferior, but allow a QUIT. This is useful if the user
521 wants to interrupt some lengthy single-stepping operation
522 (for child processes, the SIGINT goes to the inferior, and so
523 we get a SIGINT random_signal, but for remote debugging and perhaps
524 other targets, that's not true).
526 STEP nonzero if we should step (zero to continue instead).
527 SIG is the signal to give the inferior (zero for none). */
529 resume (int step
, enum target_signal sig
)
531 int should_resume
= 1;
532 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
535 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
538 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
539 over an instruction that causes a page fault without triggering
540 a hardware watchpoint. The kernel properly notices that it shouldn't
541 stop, because the hardware watchpoint is not triggered, but it forgets
542 the step request and continues the program normally.
543 Work around the problem by removing hardware watchpoints if a step is
544 requested, GDB will check for a hardware watchpoint trigger after the
546 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
547 remove_hw_watchpoints ();
550 /* Normally, by the time we reach `resume', the breakpoints are either
551 removed or inserted, as appropriate. The exception is if we're sitting
552 at a permanent breakpoint; we need to step over it, but permanent
553 breakpoints can't be removed. So we have to test for it here. */
554 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
555 SKIP_PERMANENT_BREAKPOINT ();
557 if (SOFTWARE_SINGLE_STEP_P () && step
)
559 /* Do it the hard way, w/temp breakpoints */
560 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
561 /* ...and don't ask hardware to do it. */
563 /* and do not pull these breakpoints until after a `wait' in
564 `wait_for_inferior' */
565 singlestep_breakpoints_inserted_p
= 1;
566 singlestep_ptid
= inferior_ptid
;
569 /* If there were any forks/vforks/execs that were caught and are
570 now to be followed, then do so. */
571 switch (pending_follow
.kind
)
573 case TARGET_WAITKIND_FORKED
:
574 case TARGET_WAITKIND_VFORKED
:
575 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
580 case TARGET_WAITKIND_EXECD
:
581 /* follow_exec is called as soon as the exec event is seen. */
582 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
589 /* Install inferior's terminal modes. */
590 target_terminal_inferior ();
596 resume_ptid
= RESUME_ALL
; /* Default */
598 if ((step
|| singlestep_breakpoints_inserted_p
) &&
599 (stepping_past_singlestep_breakpoint
600 || (!breakpoints_inserted
&& breakpoint_here_p (read_pc ()))))
602 /* Stepping past a breakpoint without inserting breakpoints.
603 Make sure only the current thread gets to step, so that
604 other threads don't sneak past breakpoints while they are
607 resume_ptid
= inferior_ptid
;
610 if ((scheduler_mode
== schedlock_on
) ||
611 (scheduler_mode
== schedlock_step
&&
612 (step
|| singlestep_breakpoints_inserted_p
)))
614 /* User-settable 'scheduler' mode requires solo thread resume. */
615 resume_ptid
= inferior_ptid
;
618 if (CANNOT_STEP_BREAKPOINT
)
620 /* Most targets can step a breakpoint instruction, thus
621 executing it normally. But if this one cannot, just
622 continue and we will hit it anyway. */
623 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
626 target_resume (resume_ptid
, step
, sig
);
629 discard_cleanups (old_cleanups
);
633 /* Clear out all variables saying what to do when inferior is continued.
634 First do this, then set the ones you want, then call `proceed'. */
637 clear_proceed_status (void)
640 step_range_start
= 0;
642 step_frame_id
= null_frame_id
;
643 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
645 stop_soon
= NO_STOP_QUIETLY
;
646 proceed_to_finish
= 0;
647 breakpoint_proceeded
= 1; /* We're about to proceed... */
649 /* Discard any remaining commands or status from previous stop. */
650 bpstat_clear (&stop_bpstat
);
653 /* This should be suitable for any targets that support threads. */
656 prepare_to_proceed (void)
659 struct target_waitstatus wait_status
;
661 /* Get the last target status returned by target_wait(). */
662 get_last_target_status (&wait_ptid
, &wait_status
);
664 /* Make sure we were stopped either at a breakpoint, or because
666 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
667 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
668 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
673 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
674 && !ptid_equal (inferior_ptid
, wait_ptid
))
676 /* Switched over from WAIT_PID. */
677 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
679 if (wait_pc
!= read_pc ())
681 /* Switch back to WAIT_PID thread. */
682 inferior_ptid
= wait_ptid
;
684 /* FIXME: This stuff came from switch_to_thread() in
685 thread.c (which should probably be a public function). */
686 flush_cached_frames ();
687 registers_changed ();
689 select_frame (get_current_frame ());
692 /* We return 1 to indicate that there is a breakpoint here,
693 so we need to step over it before continuing to avoid
694 hitting it straight away. */
695 if (breakpoint_here_p (wait_pc
))
703 /* Record the pc of the program the last time it stopped. This is
704 just used internally by wait_for_inferior, but need to be preserved
705 over calls to it and cleared when the inferior is started. */
706 static CORE_ADDR prev_pc
;
708 /* Basic routine for continuing the program in various fashions.
710 ADDR is the address to resume at, or -1 for resume where stopped.
711 SIGGNAL is the signal to give it, or 0 for none,
712 or -1 for act according to how it stopped.
713 STEP is nonzero if should trap after one instruction.
714 -1 means return after that and print nothing.
715 You should probably set various step_... variables
716 before calling here, if you are stepping.
718 You should call clear_proceed_status before calling proceed. */
721 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
726 step_start_function
= find_pc_function (read_pc ());
730 if (addr
== (CORE_ADDR
) -1)
732 /* If there is a breakpoint at the address we will resume at,
733 step one instruction before inserting breakpoints
734 so that we do not stop right away (and report a second
735 hit at this breakpoint). */
737 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
740 #ifndef STEP_SKIPS_DELAY
741 #define STEP_SKIPS_DELAY(pc) (0)
742 #define STEP_SKIPS_DELAY_P (0)
744 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
745 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
746 is slow (it needs to read memory from the target). */
747 if (STEP_SKIPS_DELAY_P
748 && breakpoint_here_p (read_pc () + 4)
749 && STEP_SKIPS_DELAY (read_pc ()))
757 /* In a multi-threaded task we may select another thread
758 and then continue or step.
760 But if the old thread was stopped at a breakpoint, it
761 will immediately cause another breakpoint stop without
762 any execution (i.e. it will report a breakpoint hit
763 incorrectly). So we must step over it first.
765 prepare_to_proceed checks the current thread against the thread
766 that reported the most recent event. If a step-over is required
767 it returns TRUE and sets the current thread to the old thread. */
768 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
772 if (trap_expected_after_continue
)
774 /* If (step == 0), a trap will be automatically generated after
775 the first instruction is executed. Force step one
776 instruction to clear this condition. This should not occur
777 if step is nonzero, but it is harmless in that case. */
779 trap_expected_after_continue
= 0;
781 #endif /* HP_OS_BUG */
784 /* We will get a trace trap after one instruction.
785 Continue it automatically and insert breakpoints then. */
789 insert_breakpoints ();
790 /* If we get here there was no call to error() in
791 insert breakpoints -- so they were inserted. */
792 breakpoints_inserted
= 1;
795 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
796 stop_signal
= siggnal
;
797 /* If this signal should not be seen by program,
798 give it zero. Used for debugging signals. */
799 else if (!signal_program
[stop_signal
])
800 stop_signal
= TARGET_SIGNAL_0
;
802 annotate_starting ();
804 /* Make sure that output from GDB appears before output from the
806 gdb_flush (gdb_stdout
);
808 /* Refresh prev_pc value just prior to resuming. This used to be
809 done in stop_stepping, however, setting prev_pc there did not handle
810 scenarios such as inferior function calls or returning from
811 a function via the return command. In those cases, the prev_pc
812 value was not set properly for subsequent commands. The prev_pc value
813 is used to initialize the starting line number in the ecs. With an
814 invalid value, the gdb next command ends up stopping at the position
815 represented by the next line table entry past our start position.
816 On platforms that generate one line table entry per line, this
817 is not a problem. However, on the ia64, the compiler generates
818 extraneous line table entries that do not increase the line number.
819 When we issue the gdb next command on the ia64 after an inferior call
820 or a return command, we often end up a few instructions forward, still
821 within the original line we started.
823 An attempt was made to have init_execution_control_state () refresh
824 the prev_pc value before calculating the line number. This approach
825 did not work because on platforms that use ptrace, the pc register
826 cannot be read unless the inferior is stopped. At that point, we
827 are not guaranteed the inferior is stopped and so the read_pc ()
828 call can fail. Setting the prev_pc value here ensures the value is
829 updated correctly when the inferior is stopped. */
830 prev_pc
= read_pc ();
832 /* Resume inferior. */
833 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
835 /* Wait for it to stop (if not standalone)
836 and in any case decode why it stopped, and act accordingly. */
837 /* Do this only if we are not using the event loop, or if the target
838 does not support asynchronous execution. */
839 if (!event_loop_p
|| !target_can_async_p ())
841 wait_for_inferior ();
847 /* Start remote-debugging of a machine over a serial link. */
853 init_wait_for_inferior ();
854 stop_soon
= STOP_QUIETLY
;
857 /* Always go on waiting for the target, regardless of the mode. */
858 /* FIXME: cagney/1999-09-23: At present it isn't possible to
859 indicate to wait_for_inferior that a target should timeout if
860 nothing is returned (instead of just blocking). Because of this,
861 targets expecting an immediate response need to, internally, set
862 things up so that the target_wait() is forced to eventually
864 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
865 differentiate to its caller what the state of the target is after
866 the initial open has been performed. Here we're assuming that
867 the target has stopped. It should be possible to eventually have
868 target_open() return to the caller an indication that the target
869 is currently running and GDB state should be set to the same as
871 wait_for_inferior ();
875 /* Initialize static vars when a new inferior begins. */
878 init_wait_for_inferior (void)
880 /* These are meaningless until the first time through wait_for_inferior. */
884 trap_expected_after_continue
= 0;
886 breakpoints_inserted
= 0;
887 breakpoint_init_inferior (inf_starting
);
889 /* Don't confuse first call to proceed(). */
890 stop_signal
= TARGET_SIGNAL_0
;
892 /* The first resume is not following a fork/vfork/exec. */
893 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
895 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
896 number_of_threads_in_syscalls
= 0;
898 clear_proceed_status ();
900 stepping_past_singlestep_breakpoint
= 0;
903 /* This enum encodes possible reasons for doing a target_wait, so that
904 wfi can call target_wait in one place. (Ultimately the call will be
905 moved out of the infinite loop entirely.) */
909 infwait_normal_state
,
910 infwait_thread_hop_state
,
911 infwait_nullified_state
,
912 infwait_nonstep_watch_state
915 /* Why did the inferior stop? Used to print the appropriate messages
916 to the interface from within handle_inferior_event(). */
917 enum inferior_stop_reason
919 /* We don't know why. */
921 /* Step, next, nexti, stepi finished. */
923 /* Found breakpoint. */
925 /* Inferior terminated by signal. */
927 /* Inferior exited. */
929 /* Inferior received signal, and user asked to be notified. */
933 /* This structure contains what used to be local variables in
934 wait_for_inferior. Probably many of them can return to being
935 locals in handle_inferior_event. */
937 struct execution_control_state
939 struct target_waitstatus ws
;
940 struct target_waitstatus
*wp
;
943 CORE_ADDR stop_func_start
;
944 CORE_ADDR stop_func_end
;
945 char *stop_func_name
;
946 struct symtab_and_line sal
;
947 int remove_breakpoints_on_following_step
;
949 struct symtab
*current_symtab
;
950 int handling_longjmp
; /* FIXME */
952 ptid_t saved_inferior_ptid
;
954 int stepping_through_solib_after_catch
;
955 bpstat stepping_through_solib_catchpoints
;
956 int enable_hw_watchpoints_after_wait
;
957 int stepping_through_sigtramp
;
958 int new_thread_event
;
959 struct target_waitstatus tmpstatus
;
960 enum infwait_states infwait_state
;
965 void init_execution_control_state (struct execution_control_state
*ecs
);
967 static void handle_step_into_function (struct execution_control_state
*ecs
);
968 void handle_inferior_event (struct execution_control_state
*ecs
);
970 static void step_into_function (struct execution_control_state
*ecs
);
971 static void step_over_function (struct execution_control_state
*ecs
);
972 static void insert_step_resume_breakpoint (struct frame_info
*step_frame
,
973 struct execution_control_state
*ecs
);
974 static void stop_stepping (struct execution_control_state
*ecs
);
975 static void prepare_to_wait (struct execution_control_state
*ecs
);
976 static void keep_going (struct execution_control_state
*ecs
);
977 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
980 /* Wait for control to return from inferior to debugger.
981 If inferior gets a signal, we may decide to start it up again
982 instead of returning. That is why there is a loop in this function.
983 When this function actually returns it means the inferior
984 should be left stopped and GDB should read more commands. */
987 wait_for_inferior (void)
989 struct cleanup
*old_cleanups
;
990 struct execution_control_state ecss
;
991 struct execution_control_state
*ecs
;
993 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
994 &step_resume_breakpoint
);
996 /* wfi still stays in a loop, so it's OK just to take the address of
997 a local to get the ecs pointer. */
1000 /* Fill in with reasonable starting values. */
1001 init_execution_control_state (ecs
);
1003 /* We'll update this if & when we switch to a new thread. */
1004 previous_inferior_ptid
= inferior_ptid
;
1006 overlay_cache_invalid
= 1;
1008 /* We have to invalidate the registers BEFORE calling target_wait
1009 because they can be loaded from the target while in target_wait.
1010 This makes remote debugging a bit more efficient for those
1011 targets that provide critical registers as part of their normal
1012 status mechanism. */
1014 registers_changed ();
1018 if (deprecated_target_wait_hook
)
1019 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1021 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1023 /* Now figure out what to do with the result of the result. */
1024 handle_inferior_event (ecs
);
1026 if (!ecs
->wait_some_more
)
1029 do_cleanups (old_cleanups
);
1032 /* Asynchronous version of wait_for_inferior. It is called by the
1033 event loop whenever a change of state is detected on the file
1034 descriptor corresponding to the target. It can be called more than
1035 once to complete a single execution command. In such cases we need
1036 to keep the state in a global variable ASYNC_ECSS. If it is the
1037 last time that this function is called for a single execution
1038 command, then report to the user that the inferior has stopped, and
1039 do the necessary cleanups. */
1041 struct execution_control_state async_ecss
;
1042 struct execution_control_state
*async_ecs
;
1045 fetch_inferior_event (void *client_data
)
1047 static struct cleanup
*old_cleanups
;
1049 async_ecs
= &async_ecss
;
1051 if (!async_ecs
->wait_some_more
)
1053 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1054 &step_resume_breakpoint
);
1056 /* Fill in with reasonable starting values. */
1057 init_execution_control_state (async_ecs
);
1059 /* We'll update this if & when we switch to a new thread. */
1060 previous_inferior_ptid
= inferior_ptid
;
1062 overlay_cache_invalid
= 1;
1064 /* We have to invalidate the registers BEFORE calling target_wait
1065 because they can be loaded from the target while in target_wait.
1066 This makes remote debugging a bit more efficient for those
1067 targets that provide critical registers as part of their normal
1068 status mechanism. */
1070 registers_changed ();
1073 if (deprecated_target_wait_hook
)
1075 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1077 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1079 /* Now figure out what to do with the result of the result. */
1080 handle_inferior_event (async_ecs
);
1082 if (!async_ecs
->wait_some_more
)
1084 /* Do only the cleanups that have been added by this
1085 function. Let the continuations for the commands do the rest,
1086 if there are any. */
1087 do_exec_cleanups (old_cleanups
);
1089 if (step_multi
&& stop_step
)
1090 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1092 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1096 /* Prepare an execution control state for looping through a
1097 wait_for_inferior-type loop. */
1100 init_execution_control_state (struct execution_control_state
*ecs
)
1102 /* ecs->another_trap? */
1103 ecs
->random_signal
= 0;
1104 ecs
->remove_breakpoints_on_following_step
= 0;
1105 ecs
->handling_longjmp
= 0; /* FIXME */
1106 ecs
->update_step_sp
= 0;
1107 ecs
->stepping_through_solib_after_catch
= 0;
1108 ecs
->stepping_through_solib_catchpoints
= NULL
;
1109 ecs
->enable_hw_watchpoints_after_wait
= 0;
1110 ecs
->stepping_through_sigtramp
= 0;
1111 ecs
->sal
= find_pc_line (prev_pc
, 0);
1112 ecs
->current_line
= ecs
->sal
.line
;
1113 ecs
->current_symtab
= ecs
->sal
.symtab
;
1114 ecs
->infwait_state
= infwait_normal_state
;
1115 ecs
->waiton_ptid
= pid_to_ptid (-1);
1116 ecs
->wp
= &(ecs
->ws
);
1119 /* Call this function before setting step_resume_breakpoint, as a
1120 sanity check. There should never be more than one step-resume
1121 breakpoint per thread, so we should never be setting a new
1122 step_resume_breakpoint when one is already active. */
1124 check_for_old_step_resume_breakpoint (void)
1126 if (step_resume_breakpoint
)
1128 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1131 /* Return the cached copy of the last pid/waitstatus returned by
1132 target_wait()/deprecated_target_wait_hook(). The data is actually
1133 cached by handle_inferior_event(), which gets called immediately
1134 after target_wait()/deprecated_target_wait_hook(). */
1137 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1139 *ptidp
= target_last_wait_ptid
;
1140 *status
= target_last_waitstatus
;
1143 /* Switch thread contexts, maintaining "infrun state". */
1146 context_switch (struct execution_control_state
*ecs
)
1148 /* Caution: it may happen that the new thread (or the old one!)
1149 is not in the thread list. In this case we must not attempt
1150 to "switch context", or we run the risk that our context may
1151 be lost. This may happen as a result of the target module
1152 mishandling thread creation. */
1154 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1155 { /* Perform infrun state context switch: */
1156 /* Save infrun state for the old thread. */
1157 save_infrun_state (inferior_ptid
, prev_pc
,
1158 trap_expected
, step_resume_breakpoint
,
1160 step_range_end
, &step_frame_id
,
1161 ecs
->handling_longjmp
, ecs
->another_trap
,
1162 ecs
->stepping_through_solib_after_catch
,
1163 ecs
->stepping_through_solib_catchpoints
,
1164 ecs
->stepping_through_sigtramp
,
1165 ecs
->current_line
, ecs
->current_symtab
, step_sp
);
1167 /* Load infrun state for the new thread. */
1168 load_infrun_state (ecs
->ptid
, &prev_pc
,
1169 &trap_expected
, &step_resume_breakpoint
,
1171 &step_range_end
, &step_frame_id
,
1172 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1173 &ecs
->stepping_through_solib_after_catch
,
1174 &ecs
->stepping_through_solib_catchpoints
,
1175 &ecs
->stepping_through_sigtramp
,
1176 &ecs
->current_line
, &ecs
->current_symtab
, &step_sp
);
1178 inferior_ptid
= ecs
->ptid
;
1181 /* Handle the inferior event in the cases when we just stepped
1185 handle_step_into_function (struct execution_control_state
*ecs
)
1187 CORE_ADDR real_stop_pc
;
1189 if ((step_over_calls
== STEP_OVER_NONE
)
1190 || ((step_range_end
== 1)
1191 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
1193 /* I presume that step_over_calls is only 0 when we're
1194 supposed to be stepping at the assembly language level
1195 ("stepi"). Just stop. */
1196 /* Also, maybe we just did a "nexti" inside a prolog,
1197 so we thought it was a subroutine call but it was not.
1198 Stop as well. FENN */
1200 print_stop_reason (END_STEPPING_RANGE
, 0);
1201 stop_stepping (ecs
);
1205 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
1207 /* We're doing a "next". */
1208 step_over_function (ecs
);
1213 /* If we are in a function call trampoline (a stub between
1214 the calling routine and the real function), locate the real
1215 function. That's what tells us (a) whether we want to step
1216 into it at all, and (b) what prologue we want to run to
1217 the end of, if we do step into it. */
1218 real_stop_pc
= skip_language_trampoline (stop_pc
);
1219 if (real_stop_pc
== 0)
1220 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
1221 if (real_stop_pc
!= 0)
1222 ecs
->stop_func_start
= real_stop_pc
;
1224 /* If we have line number information for the function we
1225 are thinking of stepping into, step into it.
1227 If there are several symtabs at that PC (e.g. with include
1228 files), just want to know whether *any* of them have line
1229 numbers. find_pc_line handles this. */
1231 struct symtab_and_line tmp_sal
;
1233 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
1234 if (tmp_sal
.line
!= 0)
1236 step_into_function (ecs
);
1241 /* If we have no line number and the step-stop-if-no-debug
1242 is set, we stop the step so that the user has a chance to
1243 switch in assembly mode. */
1244 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
1247 print_stop_reason (END_STEPPING_RANGE
, 0);
1248 stop_stepping (ecs
);
1252 step_over_function (ecs
);
1258 adjust_pc_after_break (struct execution_control_state
*ecs
)
1262 /* If this target does not decrement the PC after breakpoints, then
1263 we have nothing to do. */
1264 if (DECR_PC_AFTER_BREAK
== 0)
1267 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1268 we aren't, just return.
1270 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1271 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1272 by software breakpoints should be handled through the normal breakpoint
1275 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1276 different signals (SIGILL or SIGEMT for instance), but it is less
1277 clear where the PC is pointing afterwards. It may not match
1278 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1279 these signals at breakpoints (the code has been in GDB since at least
1280 1992) so I can not guess how to handle them here.
1282 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1283 would have the PC after hitting a watchpoint affected by
1284 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1285 in GDB history, and it seems unlikely to be correct, so
1286 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1288 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1291 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1294 /* Find the location where (if we've hit a breakpoint) the breakpoint would
1296 stop_pc
= read_pc_pid (ecs
->ptid
) - DECR_PC_AFTER_BREAK
;
1298 /* If we're software-single-stepping, then assume this is a breakpoint.
1299 NOTE drow/2004-01-17: This doesn't check that the PC matches, or that
1300 we're even in the right thread. The software-single-step code needs
1303 If we're not software-single-stepping, then we first check that there
1304 is an enabled software breakpoint at this address. If there is, and
1305 we weren't using hardware-single-step, then we've hit the breakpoint.
1307 If we were using hardware-single-step, we check prev_pc; if we just
1308 stepped over an inserted software breakpoint, then we should decrement
1309 the PC and eventually report hitting the breakpoint. The prev_pc check
1310 prevents us from decrementing the PC if we just stepped over a jump
1311 instruction and landed on the instruction after a breakpoint.
1313 The last bit checks that we didn't hit a breakpoint in a signal handler
1314 without an intervening stop in sigtramp, which is detected by a new
1315 stack pointer value below any usual function calling stack adjustments.
1317 NOTE drow/2004-01-17: I'm not sure that this is necessary. The check
1318 predates checking for software single step at the same time. Also,
1319 if we've moved into a signal handler we should have seen the
1322 if ((SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1323 || (software_breakpoint_inserted_here_p (stop_pc
)
1324 && !(currently_stepping (ecs
)
1325 && prev_pc
!= stop_pc
1326 && !(step_range_end
&& INNER_THAN (read_sp (), (step_sp
- 16))))))
1327 write_pc_pid (stop_pc
, ecs
->ptid
);
1330 /* Given an execution control state that has been freshly filled in
1331 by an event from the inferior, figure out what it means and take
1332 appropriate action. */
1334 int stepped_after_stopped_by_watchpoint
;
1337 handle_inferior_event (struct execution_control_state
*ecs
)
1339 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1340 thinking that the variable stepped_after_stopped_by_watchpoint
1341 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1342 defined in the file "config/pa/nm-hppah.h", accesses the variable
1343 indirectly. Mutter something rude about the HP merge. */
1344 int sw_single_step_trap_p
= 0;
1346 /* Cache the last pid/waitstatus. */
1347 target_last_wait_ptid
= ecs
->ptid
;
1348 target_last_waitstatus
= *ecs
->wp
;
1350 adjust_pc_after_break (ecs
);
1352 switch (ecs
->infwait_state
)
1354 case infwait_thread_hop_state
:
1355 /* Cancel the waiton_ptid. */
1356 ecs
->waiton_ptid
= pid_to_ptid (-1);
1357 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1358 is serviced in this loop, below. */
1359 if (ecs
->enable_hw_watchpoints_after_wait
)
1361 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1362 ecs
->enable_hw_watchpoints_after_wait
= 0;
1364 stepped_after_stopped_by_watchpoint
= 0;
1367 case infwait_normal_state
:
1368 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1369 is serviced in this loop, below. */
1370 if (ecs
->enable_hw_watchpoints_after_wait
)
1372 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1373 ecs
->enable_hw_watchpoints_after_wait
= 0;
1375 stepped_after_stopped_by_watchpoint
= 0;
1378 case infwait_nullified_state
:
1379 stepped_after_stopped_by_watchpoint
= 0;
1382 case infwait_nonstep_watch_state
:
1383 insert_breakpoints ();
1385 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1386 handle things like signals arriving and other things happening
1387 in combination correctly? */
1388 stepped_after_stopped_by_watchpoint
= 1;
1392 internal_error (__FILE__
, __LINE__
, "bad switch");
1394 ecs
->infwait_state
= infwait_normal_state
;
1396 flush_cached_frames ();
1398 /* If it's a new process, add it to the thread database */
1400 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1401 && !in_thread_list (ecs
->ptid
));
1403 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1404 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1406 add_thread (ecs
->ptid
);
1408 ui_out_text (uiout
, "[New ");
1409 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1410 ui_out_text (uiout
, "]\n");
1413 /* NOTE: This block is ONLY meant to be invoked in case of a
1414 "thread creation event"! If it is invoked for any other
1415 sort of event (such as a new thread landing on a breakpoint),
1416 the event will be discarded, which is almost certainly
1419 To avoid this, the low-level module (eg. target_wait)
1420 should call in_thread_list and add_thread, so that the
1421 new thread is known by the time we get here. */
1423 /* We may want to consider not doing a resume here in order
1424 to give the user a chance to play with the new thread.
1425 It might be good to make that a user-settable option. */
1427 /* At this point, all threads are stopped (happens
1428 automatically in either the OS or the native code).
1429 Therefore we need to continue all threads in order to
1432 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1433 prepare_to_wait (ecs
);
1438 switch (ecs
->ws
.kind
)
1440 case TARGET_WAITKIND_LOADED
:
1441 /* Ignore gracefully during startup of the inferior, as it
1442 might be the shell which has just loaded some objects,
1443 otherwise add the symbols for the newly loaded objects. */
1445 if (stop_soon
== NO_STOP_QUIETLY
)
1447 /* Remove breakpoints, SOLIB_ADD might adjust
1448 breakpoint addresses via breakpoint_re_set. */
1449 if (breakpoints_inserted
)
1450 remove_breakpoints ();
1452 /* Check for any newly added shared libraries if we're
1453 supposed to be adding them automatically. Switch
1454 terminal for any messages produced by
1455 breakpoint_re_set. */
1456 target_terminal_ours_for_output ();
1457 /* NOTE: cagney/2003-11-25: Make certain that the target
1458 stack's section table is kept up-to-date. Architectures,
1459 (e.g., PPC64), use the section table to perform
1460 operations such as address => section name and hence
1461 require the table to contain all sections (including
1462 those found in shared libraries). */
1463 /* NOTE: cagney/2003-11-25: Pass current_target and not
1464 exec_ops to SOLIB_ADD. This is because current GDB is
1465 only tooled to propagate section_table changes out from
1466 the "current_target" (see target_resize_to_sections), and
1467 not up from the exec stratum. This, of course, isn't
1468 right. "infrun.c" should only interact with the
1469 exec/process stratum, instead relying on the target stack
1470 to propagate relevant changes (stop, section table
1471 changed, ...) up to other layers. */
1472 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1473 target_terminal_inferior ();
1475 /* Reinsert breakpoints and continue. */
1476 if (breakpoints_inserted
)
1477 insert_breakpoints ();
1480 resume (0, TARGET_SIGNAL_0
);
1481 prepare_to_wait (ecs
);
1484 case TARGET_WAITKIND_SPURIOUS
:
1485 resume (0, TARGET_SIGNAL_0
);
1486 prepare_to_wait (ecs
);
1489 case TARGET_WAITKIND_EXITED
:
1490 target_terminal_ours (); /* Must do this before mourn anyway */
1491 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1493 /* Record the exit code in the convenience variable $_exitcode, so
1494 that the user can inspect this again later. */
1495 set_internalvar (lookup_internalvar ("_exitcode"),
1496 value_from_longest (builtin_type_int
,
1497 (LONGEST
) ecs
->ws
.value
.integer
));
1498 gdb_flush (gdb_stdout
);
1499 target_mourn_inferior ();
1500 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1501 stop_print_frame
= 0;
1502 stop_stepping (ecs
);
1505 case TARGET_WAITKIND_SIGNALLED
:
1506 stop_print_frame
= 0;
1507 stop_signal
= ecs
->ws
.value
.sig
;
1508 target_terminal_ours (); /* Must do this before mourn anyway */
1510 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1511 reach here unless the inferior is dead. However, for years
1512 target_kill() was called here, which hints that fatal signals aren't
1513 really fatal on some systems. If that's true, then some changes
1515 target_mourn_inferior ();
1517 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1518 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1519 stop_stepping (ecs
);
1522 /* The following are the only cases in which we keep going;
1523 the above cases end in a continue or goto. */
1524 case TARGET_WAITKIND_FORKED
:
1525 case TARGET_WAITKIND_VFORKED
:
1526 stop_signal
= TARGET_SIGNAL_TRAP
;
1527 pending_follow
.kind
= ecs
->ws
.kind
;
1529 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1530 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1532 stop_pc
= read_pc ();
1534 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1536 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1538 /* If no catchpoint triggered for this, then keep going. */
1539 if (ecs
->random_signal
)
1541 stop_signal
= TARGET_SIGNAL_0
;
1545 goto process_event_stop_test
;
1547 case TARGET_WAITKIND_EXECD
:
1548 stop_signal
= TARGET_SIGNAL_TRAP
;
1550 /* NOTE drow/2002-12-05: This code should be pushed down into the
1551 target_wait function. Until then following vfork on HP/UX 10.20
1552 is probably broken by this. Of course, it's broken anyway. */
1553 /* Is this a target which reports multiple exec events per actual
1554 call to exec()? (HP-UX using ptrace does, for example.) If so,
1555 ignore all but the last one. Just resume the exec'r, and wait
1556 for the next exec event. */
1557 if (inferior_ignoring_leading_exec_events
)
1559 inferior_ignoring_leading_exec_events
--;
1560 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1561 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1563 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1564 prepare_to_wait (ecs
);
1567 inferior_ignoring_leading_exec_events
=
1568 target_reported_exec_events_per_exec_call () - 1;
1570 pending_follow
.execd_pathname
=
1571 savestring (ecs
->ws
.value
.execd_pathname
,
1572 strlen (ecs
->ws
.value
.execd_pathname
));
1574 /* This causes the eventpoints and symbol table to be reset. Must
1575 do this now, before trying to determine whether to stop. */
1576 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1577 xfree (pending_follow
.execd_pathname
);
1579 stop_pc
= read_pc_pid (ecs
->ptid
);
1580 ecs
->saved_inferior_ptid
= inferior_ptid
;
1581 inferior_ptid
= ecs
->ptid
;
1583 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1585 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1586 inferior_ptid
= ecs
->saved_inferior_ptid
;
1588 /* If no catchpoint triggered for this, then keep going. */
1589 if (ecs
->random_signal
)
1591 stop_signal
= TARGET_SIGNAL_0
;
1595 goto process_event_stop_test
;
1597 /* These syscall events are returned on HP-UX, as part of its
1598 implementation of page-protection-based "hardware" watchpoints.
1599 HP-UX has unfortunate interactions between page-protections and
1600 some system calls. Our solution is to disable hardware watches
1601 when a system call is entered, and reenable them when the syscall
1602 completes. The downside of this is that we may miss the precise
1603 point at which a watched piece of memory is modified. "Oh well."
1605 Note that we may have multiple threads running, which may each
1606 enter syscalls at roughly the same time. Since we don't have a
1607 good notion currently of whether a watched piece of memory is
1608 thread-private, we'd best not have any page-protections active
1609 when any thread is in a syscall. Thus, we only want to reenable
1610 hardware watches when no threads are in a syscall.
1612 Also, be careful not to try to gather much state about a thread
1613 that's in a syscall. It's frequently a losing proposition. */
1614 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1615 number_of_threads_in_syscalls
++;
1616 if (number_of_threads_in_syscalls
== 1)
1618 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1620 resume (0, TARGET_SIGNAL_0
);
1621 prepare_to_wait (ecs
);
1624 /* Before examining the threads further, step this thread to
1625 get it entirely out of the syscall. (We get notice of the
1626 event when the thread is just on the verge of exiting a
1627 syscall. Stepping one instruction seems to get it back
1630 Note that although the logical place to reenable h/w watches
1631 is here, we cannot. We cannot reenable them before stepping
1632 the thread (this causes the next wait on the thread to hang).
1634 Nor can we enable them after stepping until we've done a wait.
1635 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1636 here, which will be serviced immediately after the target
1638 case TARGET_WAITKIND_SYSCALL_RETURN
:
1639 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1641 if (number_of_threads_in_syscalls
> 0)
1643 number_of_threads_in_syscalls
--;
1644 ecs
->enable_hw_watchpoints_after_wait
=
1645 (number_of_threads_in_syscalls
== 0);
1647 prepare_to_wait (ecs
);
1650 case TARGET_WAITKIND_STOPPED
:
1651 stop_signal
= ecs
->ws
.value
.sig
;
1654 /* We had an event in the inferior, but we are not interested
1655 in handling it at this level. The lower layers have already
1656 done what needs to be done, if anything.
1658 One of the possible circumstances for this is when the
1659 inferior produces output for the console. The inferior has
1660 not stopped, and we are ignoring the event. Another possible
1661 circumstance is any event which the lower level knows will be
1662 reported multiple times without an intervening resume. */
1663 case TARGET_WAITKIND_IGNORE
:
1664 prepare_to_wait (ecs
);
1668 /* We may want to consider not doing a resume here in order to give
1669 the user a chance to play with the new thread. It might be good
1670 to make that a user-settable option. */
1672 /* At this point, all threads are stopped (happens automatically in
1673 either the OS or the native code). Therefore we need to continue
1674 all threads in order to make progress. */
1675 if (ecs
->new_thread_event
)
1677 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1678 prepare_to_wait (ecs
);
1682 stop_pc
= read_pc_pid (ecs
->ptid
);
1684 if (stepping_past_singlestep_breakpoint
)
1686 gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
);
1687 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1688 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1690 stepping_past_singlestep_breakpoint
= 0;
1692 /* We've either finished single-stepping past the single-step
1693 breakpoint, or stopped for some other reason. It would be nice if
1694 we could tell, but we can't reliably. */
1695 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1697 /* Pull the single step breakpoints out of the target. */
1698 SOFTWARE_SINGLE_STEP (0, 0);
1699 singlestep_breakpoints_inserted_p
= 0;
1701 ecs
->random_signal
= 0;
1703 ecs
->ptid
= saved_singlestep_ptid
;
1704 context_switch (ecs
);
1705 if (deprecated_context_hook
)
1706 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1708 resume (1, TARGET_SIGNAL_0
);
1709 prepare_to_wait (ecs
);
1714 stepping_past_singlestep_breakpoint
= 0;
1716 /* See if a thread hit a thread-specific breakpoint that was meant for
1717 another thread. If so, then step that thread past the breakpoint,
1720 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1722 int thread_hop_needed
= 0;
1724 /* Check if a regular breakpoint has been hit before checking
1725 for a potential single step breakpoint. Otherwise, GDB will
1726 not see this breakpoint hit when stepping onto breakpoints. */
1727 if (breakpoints_inserted
&& breakpoint_here_p (stop_pc
))
1729 ecs
->random_signal
= 0;
1730 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1731 thread_hop_needed
= 1;
1733 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1735 ecs
->random_signal
= 0;
1736 /* The call to in_thread_list is necessary because PTIDs sometimes
1737 change when we go from single-threaded to multi-threaded. If
1738 the singlestep_ptid is still in the list, assume that it is
1739 really different from ecs->ptid. */
1740 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1741 && in_thread_list (singlestep_ptid
))
1743 thread_hop_needed
= 1;
1744 stepping_past_singlestep_breakpoint
= 1;
1745 saved_singlestep_ptid
= singlestep_ptid
;
1749 if (thread_hop_needed
)
1753 /* Saw a breakpoint, but it was hit by the wrong thread.
1756 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1758 /* Pull the single step breakpoints out of the target. */
1759 SOFTWARE_SINGLE_STEP (0, 0);
1760 singlestep_breakpoints_inserted_p
= 0;
1763 remove_status
= remove_breakpoints ();
1764 /* Did we fail to remove breakpoints? If so, try
1765 to set the PC past the bp. (There's at least
1766 one situation in which we can fail to remove
1767 the bp's: On HP-UX's that use ttrace, we can't
1768 change the address space of a vforking child
1769 process until the child exits (well, okay, not
1770 then either :-) or execs. */
1771 if (remove_status
!= 0)
1773 /* FIXME! This is obviously non-portable! */
1774 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1775 /* We need to restart all the threads now,
1776 * unles we're running in scheduler-locked mode.
1777 * Use currently_stepping to determine whether to
1780 /* FIXME MVS: is there any reason not to call resume()? */
1781 if (scheduler_mode
== schedlock_on
)
1782 target_resume (ecs
->ptid
,
1783 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1785 target_resume (RESUME_ALL
,
1786 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1787 prepare_to_wait (ecs
);
1792 breakpoints_inserted
= 0;
1793 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1794 context_switch (ecs
);
1795 ecs
->waiton_ptid
= ecs
->ptid
;
1796 ecs
->wp
= &(ecs
->ws
);
1797 ecs
->another_trap
= 1;
1799 ecs
->infwait_state
= infwait_thread_hop_state
;
1801 registers_changed ();
1805 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1807 sw_single_step_trap_p
= 1;
1808 ecs
->random_signal
= 0;
1812 ecs
->random_signal
= 1;
1814 /* See if something interesting happened to the non-current thread. If
1815 so, then switch to that thread. */
1816 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1818 context_switch (ecs
);
1820 if (deprecated_context_hook
)
1821 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1823 flush_cached_frames ();
1826 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1828 /* Pull the single step breakpoints out of the target. */
1829 SOFTWARE_SINGLE_STEP (0, 0);
1830 singlestep_breakpoints_inserted_p
= 0;
1833 /* If PC is pointing at a nullified instruction, then step beyond
1834 it so that the user won't be confused when GDB appears to be ready
1837 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1838 if (INSTRUCTION_NULLIFIED
)
1840 registers_changed ();
1841 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1843 /* We may have received a signal that we want to pass to
1844 the inferior; therefore, we must not clobber the waitstatus
1847 ecs
->infwait_state
= infwait_nullified_state
;
1848 ecs
->waiton_ptid
= ecs
->ptid
;
1849 ecs
->wp
= &(ecs
->tmpstatus
);
1850 prepare_to_wait (ecs
);
1854 /* It may not be necessary to disable the watchpoint to stop over
1855 it. For example, the PA can (with some kernel cooperation)
1856 single step over a watchpoint without disabling the watchpoint. */
1857 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1860 prepare_to_wait (ecs
);
1864 /* It is far more common to need to disable a watchpoint to step
1865 the inferior over it. FIXME. What else might a debug
1866 register or page protection watchpoint scheme need here? */
1867 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1869 /* At this point, we are stopped at an instruction which has
1870 attempted to write to a piece of memory under control of
1871 a watchpoint. The instruction hasn't actually executed
1872 yet. If we were to evaluate the watchpoint expression
1873 now, we would get the old value, and therefore no change
1874 would seem to have occurred.
1876 In order to make watchpoints work `right', we really need
1877 to complete the memory write, and then evaluate the
1878 watchpoint expression. The following code does that by
1879 removing the watchpoint (actually, all watchpoints and
1880 breakpoints), single-stepping the target, re-inserting
1881 watchpoints, and then falling through to let normal
1882 single-step processing handle proceed. Since this
1883 includes evaluating watchpoints, things will come to a
1884 stop in the correct manner. */
1886 remove_breakpoints ();
1887 registers_changed ();
1888 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1890 ecs
->waiton_ptid
= ecs
->ptid
;
1891 ecs
->wp
= &(ecs
->ws
);
1892 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1893 prepare_to_wait (ecs
);
1897 /* It may be possible to simply continue after a watchpoint. */
1898 if (HAVE_CONTINUABLE_WATCHPOINT
)
1899 STOPPED_BY_WATCHPOINT (ecs
->ws
);
1901 ecs
->stop_func_start
= 0;
1902 ecs
->stop_func_end
= 0;
1903 ecs
->stop_func_name
= 0;
1904 /* Don't care about return value; stop_func_start and stop_func_name
1905 will both be 0 if it doesn't work. */
1906 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1907 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1908 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
1909 ecs
->another_trap
= 0;
1910 bpstat_clear (&stop_bpstat
);
1912 stop_stack_dummy
= 0;
1913 stop_print_frame
= 1;
1914 ecs
->random_signal
= 0;
1915 stopped_by_random_signal
= 0;
1916 breakpoints_failed
= 0;
1918 /* Look at the cause of the stop, and decide what to do.
1919 The alternatives are:
1920 1) break; to really stop and return to the debugger,
1921 2) drop through to start up again
1922 (set ecs->another_trap to 1 to single step once)
1923 3) set ecs->random_signal to 1, and the decision between 1 and 2
1924 will be made according to the signal handling tables. */
1926 /* First, distinguish signals caused by the debugger from signals
1927 that have to do with the program's own actions. Note that
1928 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1929 on the operating system version. Here we detect when a SIGILL or
1930 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1931 something similar for SIGSEGV, since a SIGSEGV will be generated
1932 when we're trying to execute a breakpoint instruction on a
1933 non-executable stack. This happens for call dummy breakpoints
1934 for architectures like SPARC that place call dummies on the
1937 if (stop_signal
== TARGET_SIGNAL_TRAP
1938 || (breakpoints_inserted
&&
1939 (stop_signal
== TARGET_SIGNAL_ILL
1940 || stop_signal
== TARGET_SIGNAL_SEGV
1941 || stop_signal
== TARGET_SIGNAL_EMT
))
1942 || stop_soon
== STOP_QUIETLY
1943 || stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1945 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1947 stop_print_frame
= 0;
1948 stop_stepping (ecs
);
1952 /* This is originated from start_remote(), start_inferior() and
1953 shared libraries hook functions. */
1954 if (stop_soon
== STOP_QUIETLY
)
1956 stop_stepping (ecs
);
1960 /* This originates from attach_command(). We need to overwrite
1961 the stop_signal here, because some kernels don't ignore a
1962 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1963 See more comments in inferior.h. */
1964 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1966 stop_stepping (ecs
);
1967 if (stop_signal
== TARGET_SIGNAL_STOP
)
1968 stop_signal
= TARGET_SIGNAL_0
;
1972 /* Don't even think about breakpoints if just proceeded over a
1974 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
)
1975 bpstat_clear (&stop_bpstat
);
1978 /* See if there is a breakpoint at the current PC. */
1979 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1981 /* Following in case break condition called a
1983 stop_print_frame
= 1;
1986 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1987 at one stage in the past included checks for an inferior
1988 function call's call dummy's return breakpoint. The original
1989 comment, that went with the test, read:
1991 ``End of a stack dummy. Some systems (e.g. Sony news) give
1992 another signal besides SIGTRAP, so check here as well as
1995 If someone ever tries to get get call dummys on a
1996 non-executable stack to work (where the target would stop
1997 with something like a SIGSEGV), then those tests might need
1998 to be re-instated. Given, however, that the tests were only
1999 enabled when momentary breakpoints were not being used, I
2000 suspect that it won't be the case.
2002 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2003 be necessary for call dummies on a non-executable stack on
2006 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2008 = !(bpstat_explains_signal (stop_bpstat
)
2010 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2013 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
2014 if (!ecs
->random_signal
)
2015 stop_signal
= TARGET_SIGNAL_TRAP
;
2019 /* When we reach this point, we've pretty much decided
2020 that the reason for stopping must've been a random
2021 (unexpected) signal. */
2024 ecs
->random_signal
= 1;
2026 process_event_stop_test
:
2027 /* For the program's own signals, act according to
2028 the signal handling tables. */
2030 if (ecs
->random_signal
)
2032 /* Signal not for debugging purposes. */
2035 stopped_by_random_signal
= 1;
2037 if (signal_print
[stop_signal
])
2040 target_terminal_ours_for_output ();
2041 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2043 if (signal_stop
[stop_signal
])
2045 stop_stepping (ecs
);
2048 /* If not going to stop, give terminal back
2049 if we took it away. */
2051 target_terminal_inferior ();
2053 /* Clear the signal if it should not be passed. */
2054 if (signal_program
[stop_signal
] == 0)
2055 stop_signal
= TARGET_SIGNAL_0
;
2057 if (step_range_end
!= 0
2058 && stop_signal
!= TARGET_SIGNAL_0
2059 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
2060 && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
))
2062 /* The inferior is about to take a signal that will take it
2063 out of the single step range. Set a breakpoint at the
2064 current PC (which is presumably where the signal handler
2065 will eventually return) and then allow the inferior to
2068 Note that this is only needed for a signal delivered
2069 while in the single-step range. Nested signals aren't a
2070 problem as they eventually all return. */
2071 insert_step_resume_breakpoint (get_current_frame (), ecs
);
2077 /* Handle cases caused by hitting a breakpoint. */
2079 CORE_ADDR jmp_buf_pc
;
2080 struct bpstat_what what
;
2082 what
= bpstat_what (stop_bpstat
);
2084 if (what
.call_dummy
)
2086 stop_stack_dummy
= 1;
2088 trap_expected_after_continue
= 1;
2092 switch (what
.main_action
)
2094 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2095 /* If we hit the breakpoint at longjmp, disable it for the
2096 duration of this command. Then, install a temporary
2097 breakpoint at the target of the jmp_buf. */
2098 disable_longjmp_breakpoint ();
2099 remove_breakpoints ();
2100 breakpoints_inserted
= 0;
2101 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
2107 /* Need to blow away step-resume breakpoint, as it
2108 interferes with us */
2109 if (step_resume_breakpoint
!= NULL
)
2111 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2115 /* FIXME - Need to implement nested temporary breakpoints */
2116 if (step_over_calls
> 0)
2117 set_longjmp_resume_breakpoint (jmp_buf_pc
, get_current_frame ());
2120 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2121 ecs
->handling_longjmp
= 1; /* FIXME */
2125 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2126 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2127 remove_breakpoints ();
2128 breakpoints_inserted
= 0;
2130 /* FIXME - Need to implement nested temporary breakpoints */
2132 && (frame_id_inner (get_frame_id (get_current_frame ()),
2135 ecs
->another_trap
= 1;
2140 disable_longjmp_breakpoint ();
2141 ecs
->handling_longjmp
= 0; /* FIXME */
2142 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2144 /* else fallthrough */
2146 case BPSTAT_WHAT_SINGLE
:
2147 if (breakpoints_inserted
)
2149 remove_breakpoints ();
2151 breakpoints_inserted
= 0;
2152 ecs
->another_trap
= 1;
2153 /* Still need to check other stuff, at least the case
2154 where we are stepping and step out of the right range. */
2157 case BPSTAT_WHAT_STOP_NOISY
:
2158 stop_print_frame
= 1;
2160 /* We are about to nuke the step_resume_breakpointt via the
2161 cleanup chain, so no need to worry about it here. */
2163 stop_stepping (ecs
);
2166 case BPSTAT_WHAT_STOP_SILENT
:
2167 stop_print_frame
= 0;
2169 /* We are about to nuke the step_resume_breakpoin via the
2170 cleanup chain, so no need to worry about it here. */
2172 stop_stepping (ecs
);
2175 case BPSTAT_WHAT_STEP_RESUME
:
2176 /* This proably demands a more elegant solution, but, yeah
2179 This function's use of the simple variable
2180 step_resume_breakpoint doesn't seem to accomodate
2181 simultaneously active step-resume bp's, although the
2182 breakpoint list certainly can.
2184 If we reach here and step_resume_breakpoint is already
2185 NULL, then apparently we have multiple active
2186 step-resume bp's. We'll just delete the breakpoint we
2187 stopped at, and carry on.
2189 Correction: what the code currently does is delete a
2190 step-resume bp, but it makes no effort to ensure that
2191 the one deleted is the one currently stopped at. MVS */
2193 if (step_resume_breakpoint
== NULL
)
2195 step_resume_breakpoint
=
2196 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2198 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2201 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2202 /* If were waiting for a trap, hitting the step_resume_break
2203 doesn't count as getting it. */
2205 ecs
->another_trap
= 1;
2208 case BPSTAT_WHAT_CHECK_SHLIBS
:
2209 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2212 /* Remove breakpoints, we eventually want to step over the
2213 shlib event breakpoint, and SOLIB_ADD might adjust
2214 breakpoint addresses via breakpoint_re_set. */
2215 if (breakpoints_inserted
)
2216 remove_breakpoints ();
2217 breakpoints_inserted
= 0;
2219 /* Check for any newly added shared libraries if we're
2220 supposed to be adding them automatically. Switch
2221 terminal for any messages produced by
2222 breakpoint_re_set. */
2223 target_terminal_ours_for_output ();
2224 /* NOTE: cagney/2003-11-25: Make certain that the target
2225 stack's section table is kept up-to-date. Architectures,
2226 (e.g., PPC64), use the section table to perform
2227 operations such as address => section name and hence
2228 require the table to contain all sections (including
2229 those found in shared libraries). */
2230 /* NOTE: cagney/2003-11-25: Pass current_target and not
2231 exec_ops to SOLIB_ADD. This is because current GDB is
2232 only tooled to propagate section_table changes out from
2233 the "current_target" (see target_resize_to_sections), and
2234 not up from the exec stratum. This, of course, isn't
2235 right. "infrun.c" should only interact with the
2236 exec/process stratum, instead relying on the target stack
2237 to propagate relevant changes (stop, section table
2238 changed, ...) up to other layers. */
2239 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2240 target_terminal_inferior ();
2242 /* Try to reenable shared library breakpoints, additional
2243 code segments in shared libraries might be mapped in now. */
2244 re_enable_breakpoints_in_shlibs ();
2246 /* If requested, stop when the dynamic linker notifies
2247 gdb of events. This allows the user to get control
2248 and place breakpoints in initializer routines for
2249 dynamically loaded objects (among other things). */
2250 if (stop_on_solib_events
|| stop_stack_dummy
)
2252 stop_stepping (ecs
);
2256 /* If we stopped due to an explicit catchpoint, then the
2257 (see above) call to SOLIB_ADD pulled in any symbols
2258 from a newly-loaded library, if appropriate.
2260 We do want the inferior to stop, but not where it is
2261 now, which is in the dynamic linker callback. Rather,
2262 we would like it stop in the user's program, just after
2263 the call that caused this catchpoint to trigger. That
2264 gives the user a more useful vantage from which to
2265 examine their program's state. */
2266 else if (what
.main_action
==
2267 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2269 /* ??rehrauer: If I could figure out how to get the
2270 right return PC from here, we could just set a temp
2271 breakpoint and resume. I'm not sure we can without
2272 cracking open the dld's shared libraries and sniffing
2273 their unwind tables and text/data ranges, and that's
2274 not a terribly portable notion.
2276 Until that time, we must step the inferior out of the
2277 dld callback, and also out of the dld itself (and any
2278 code or stubs in libdld.sl, such as "shl_load" and
2279 friends) until we reach non-dld code. At that point,
2280 we can stop stepping. */
2281 bpstat_get_triggered_catchpoints (stop_bpstat
,
2283 stepping_through_solib_catchpoints
);
2284 ecs
->stepping_through_solib_after_catch
= 1;
2286 /* Be sure to lift all breakpoints, so the inferior does
2287 actually step past this point... */
2288 ecs
->another_trap
= 1;
2293 /* We want to step over this breakpoint, then keep going. */
2294 ecs
->another_trap
= 1;
2301 case BPSTAT_WHAT_LAST
:
2302 /* Not a real code, but listed here to shut up gcc -Wall. */
2304 case BPSTAT_WHAT_KEEP_CHECKING
:
2309 /* We come here if we hit a breakpoint but should not
2310 stop for it. Possibly we also were stepping
2311 and should stop for that. So fall through and
2312 test for stepping. But, if not stepping,
2315 /* Are we stepping to get the inferior out of the dynamic
2316 linker's hook (and possibly the dld itself) after catching
2318 if (ecs
->stepping_through_solib_after_catch
)
2320 #if defined(SOLIB_ADD)
2321 /* Have we reached our destination? If not, keep going. */
2322 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2324 ecs
->another_trap
= 1;
2329 /* Else, stop and report the catchpoint(s) whose triggering
2330 caused us to begin stepping. */
2331 ecs
->stepping_through_solib_after_catch
= 0;
2332 bpstat_clear (&stop_bpstat
);
2333 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2334 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2335 stop_print_frame
= 1;
2336 stop_stepping (ecs
);
2340 if (step_resume_breakpoint
)
2342 /* Having a step-resume breakpoint overrides anything
2343 else having to do with stepping commands until
2344 that breakpoint is reached. */
2349 if (step_range_end
== 0)
2351 /* Likewise if we aren't even stepping. */
2356 /* If stepping through a line, keep going if still within it.
2358 Note that step_range_end is the address of the first instruction
2359 beyond the step range, and NOT the address of the last instruction
2361 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2367 /* We stepped out of the stepping range. */
2369 /* If we are stepping at the source level and entered the runtime
2370 loader dynamic symbol resolution code, we keep on single stepping
2371 until we exit the run time loader code and reach the callee's
2373 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2374 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2376 CORE_ADDR pc_after_resolver
=
2377 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2379 if (pc_after_resolver
)
2381 /* Set up a step-resume breakpoint at the address
2382 indicated by SKIP_SOLIB_RESOLVER. */
2383 struct symtab_and_line sr_sal
;
2385 sr_sal
.pc
= pc_after_resolver
;
2387 check_for_old_step_resume_breakpoint ();
2388 step_resume_breakpoint
=
2389 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2390 if (breakpoints_inserted
)
2391 insert_breakpoints ();
2398 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2399 && ecs
->stop_func_name
== NULL
)
2401 /* There is no symbol, not even a minimal symbol, corresponding
2402 to the address where we just stopped. So we just stepped
2403 inside undebuggable code. Since we want to step over this
2404 kind of code, we keep going until the inferior returns from
2405 the current function. */
2406 handle_step_into_function (ecs
);
2410 /* We can't update step_sp every time through the loop, because
2411 reading the stack pointer would slow down stepping too much.
2412 But we can update it every time we leave the step range. */
2413 ecs
->update_step_sp
= 1;
2415 if (step_range_end
!= 1
2416 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2417 || step_over_calls
== STEP_OVER_ALL
)
2418 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2420 /* The inferior, while doing a "step" or "next", has ended up in
2421 a signal trampoline (either by a signal being delivered or by
2422 the signal handler returning). Just single-step until the
2423 inferior leaves the trampoline (either by calling the handler
2429 if (frame_id_eq (get_frame_id (get_prev_frame (get_current_frame ())),
2432 /* It's a subroutine call. */
2433 handle_step_into_function (ecs
);
2437 /* We've wandered out of the step range. */
2439 ecs
->sal
= find_pc_line (stop_pc
, 0);
2441 if (step_range_end
== 1)
2443 /* It is stepi or nexti. We always want to stop stepping after
2446 print_stop_reason (END_STEPPING_RANGE
, 0);
2447 stop_stepping (ecs
);
2451 /* If we're in the return path from a shared library trampoline,
2452 we want to proceed through the trampoline when stepping. */
2453 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2455 /* Determine where this trampoline returns. */
2456 CORE_ADDR real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2458 /* Only proceed through if we know where it's going. */
2461 /* And put the step-breakpoint there and go until there. */
2462 struct symtab_and_line sr_sal
;
2464 init_sal (&sr_sal
); /* initialize to zeroes */
2465 sr_sal
.pc
= real_stop_pc
;
2466 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2467 /* Do not specify what the fp should be when we stop
2468 since on some machines the prologue
2469 is where the new fp value is established. */
2470 check_for_old_step_resume_breakpoint ();
2471 step_resume_breakpoint
=
2472 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2473 if (breakpoints_inserted
)
2474 insert_breakpoints ();
2476 /* Restart without fiddling with the step ranges or
2483 if (ecs
->sal
.line
== 0)
2485 /* We have no line number information. That means to stop
2486 stepping (does this always happen right after one instruction,
2487 when we do "s" in a function with no line numbers,
2488 or can this happen as a result of a return or longjmp?). */
2490 print_stop_reason (END_STEPPING_RANGE
, 0);
2491 stop_stepping (ecs
);
2495 if ((stop_pc
== ecs
->sal
.pc
)
2496 && (ecs
->current_line
!= ecs
->sal
.line
2497 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2499 /* We are at the start of a different line. So stop. Note that
2500 we don't stop if we step into the middle of a different line.
2501 That is said to make things like for (;;) statements work
2504 print_stop_reason (END_STEPPING_RANGE
, 0);
2505 stop_stepping (ecs
);
2509 /* We aren't done stepping.
2511 Optimize by setting the stepping range to the line.
2512 (We might not be in the original line, but if we entered a
2513 new line in mid-statement, we continue stepping. This makes
2514 things like for(;;) statements work better.) */
2516 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2518 /* If this is the last line of the function, don't keep stepping
2519 (it would probably step us out of the function).
2520 This is particularly necessary for a one-line function,
2521 in which after skipping the prologue we better stop even though
2522 we will be in mid-line. */
2524 print_stop_reason (END_STEPPING_RANGE
, 0);
2525 stop_stepping (ecs
);
2528 step_range_start
= ecs
->sal
.pc
;
2529 step_range_end
= ecs
->sal
.end
;
2530 step_frame_id
= get_frame_id (get_current_frame ());
2531 ecs
->current_line
= ecs
->sal
.line
;
2532 ecs
->current_symtab
= ecs
->sal
.symtab
;
2534 /* In the case where we just stepped out of a function into the
2535 middle of a line of the caller, continue stepping, but
2536 step_frame_id must be modified to current frame */
2538 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2539 generous. It will trigger on things like a step into a frameless
2540 stackless leaf function. I think the logic should instead look
2541 at the unwound frame ID has that should give a more robust
2542 indication of what happened. */
2543 if (step
-ID
== current
-ID
)
2544 still stepping in same function
;
2545 else if (step
-ID
== unwind (current
-ID
))
2546 stepped into a function
;
2548 stepped out of a function
;
2549 /* Of course this assumes that the frame ID unwind code is robust
2550 and we're willing to introduce frame unwind logic into this
2551 function. Fortunately, those days are nearly upon us. */
2554 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2555 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2556 step_frame_id
= current_frame
;
2562 /* Are we in the middle of stepping? */
2565 currently_stepping (struct execution_control_state
*ecs
)
2567 return ((!ecs
->handling_longjmp
2568 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2570 || ecs
->stepping_through_solib_after_catch
2571 || bpstat_should_step ());
2574 /* Subroutine call with source code we should not step over. Do step
2575 to the first line of code in it. */
2578 step_into_function (struct execution_control_state
*ecs
)
2581 struct symtab_and_line sr_sal
;
2583 s
= find_pc_symtab (stop_pc
);
2584 if (s
&& s
->language
!= language_asm
)
2585 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2587 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2588 /* Use the step_resume_break to step until the end of the prologue,
2589 even if that involves jumps (as it seems to on the vax under
2591 /* If the prologue ends in the middle of a source line, continue to
2592 the end of that source line (if it is still within the function).
2593 Otherwise, just go to end of prologue. */
2595 && ecs
->sal
.pc
!= ecs
->stop_func_start
2596 && ecs
->sal
.end
< ecs
->stop_func_end
)
2597 ecs
->stop_func_start
= ecs
->sal
.end
;
2599 /* Architectures which require breakpoint adjustment might not be able
2600 to place a breakpoint at the computed address. If so, the test
2601 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2602 ecs->stop_func_start to an address at which a breakpoint may be
2603 legitimately placed.
2605 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2606 made, GDB will enter an infinite loop when stepping through
2607 optimized code consisting of VLIW instructions which contain
2608 subinstructions corresponding to different source lines. On
2609 FR-V, it's not permitted to place a breakpoint on any but the
2610 first subinstruction of a VLIW instruction. When a breakpoint is
2611 set, GDB will adjust the breakpoint address to the beginning of
2612 the VLIW instruction. Thus, we need to make the corresponding
2613 adjustment here when computing the stop address. */
2615 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2617 ecs
->stop_func_start
2618 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2619 ecs
->stop_func_start
);
2622 if (ecs
->stop_func_start
== stop_pc
)
2624 /* We are already there: stop now. */
2626 print_stop_reason (END_STEPPING_RANGE
, 0);
2627 stop_stepping (ecs
);
2632 /* Put the step-breakpoint there and go until there. */
2633 init_sal (&sr_sal
); /* initialize to zeroes */
2634 sr_sal
.pc
= ecs
->stop_func_start
;
2635 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2636 /* Do not specify what the fp should be when we stop since on
2637 some machines the prologue is where the new fp value is
2639 check_for_old_step_resume_breakpoint ();
2640 step_resume_breakpoint
=
2641 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2642 if (breakpoints_inserted
)
2643 insert_breakpoints ();
2645 /* And make sure stepping stops right away then. */
2646 step_range_end
= step_range_start
;
2651 /* The inferior, as a result of a function call (has left) or signal
2652 (about to leave) the single-step range. Set a momentary breakpoint
2653 within the step range where the inferior is expected to later
2657 insert_step_resume_breakpoint (struct frame_info
*step_frame
,
2658 struct execution_control_state
*ecs
)
2660 struct symtab_and_line sr_sal
;
2662 /* This is only used within the step-resume range/frame. */
2663 gdb_assert (frame_id_eq (step_frame_id
, get_frame_id (step_frame
)));
2664 gdb_assert (step_range_end
!= 0);
2665 gdb_assert (get_frame_pc (step_frame
) >= step_range_start
2666 && get_frame_pc (step_frame
) < step_range_end
);
2668 init_sal (&sr_sal
); /* initialize to zeros */
2670 sr_sal
.pc
= ADDR_BITS_REMOVE (get_frame_pc (step_frame
));
2671 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2673 check_for_old_step_resume_breakpoint ();
2675 step_resume_breakpoint
2676 = set_momentary_breakpoint (sr_sal
, get_frame_id (step_frame
),
2679 if (breakpoints_inserted
)
2680 insert_breakpoints ();
2683 /* We've just entered a callee, and we wish to resume until it returns
2684 to the caller. Setting a step_resume breakpoint on the return
2685 address will catch a return from the callee.
2687 However, if the callee is recursing, we want to be careful not to
2688 catch returns of those recursive calls, but only of THIS instance
2691 To do this, we set the step_resume bp's frame to our current
2692 caller's frame (obtained by doing a frame ID unwind). */
2695 step_over_function (struct execution_control_state
*ecs
)
2697 struct symtab_and_line sr_sal
;
2698 struct frame_id sr_id
;
2700 init_sal (&sr_sal
); /* initialize to zeros */
2702 /* NOTE: cagney/2003-04-06:
2704 At this point the equality get_frame_pc() == get_frame_func()
2705 should hold. This may make it possible for this code to tell the
2706 frame where it's function is, instead of the reverse. This would
2707 avoid the need to search for the frame's function, which can get
2708 very messy when there is no debug info available (look at the
2709 heuristic find pc start code found in targets like the MIPS). */
2711 /* NOTE: cagney/2003-04-06:
2713 The intent of DEPRECATED_SAVED_PC_AFTER_CALL was to:
2715 - provide a very light weight equivalent to frame_unwind_pc()
2716 (nee FRAME_SAVED_PC) that avoids the prologue analyzer
2718 - avoid handling the case where the PC hasn't been saved in the
2721 Unfortunately, not five lines further down, is a call to
2722 get_frame_id() and that is guarenteed to trigger the prologue
2725 The `correct fix' is for the prologe analyzer to handle the case
2726 where the prologue is incomplete (PC in prologue) and,
2727 consequently, the return pc has not yet been saved. It should be
2728 noted that the prologue analyzer needs to handle this case
2729 anyway: frameless leaf functions that don't save the return PC;
2730 single stepping through a prologue.
2732 The d10v handles all this by bailing out of the prologue analsis
2733 when it reaches the current instruction. */
2735 if (DEPRECATED_SAVED_PC_AFTER_CALL_P ())
2736 sr_sal
.pc
= ADDR_BITS_REMOVE (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ()));
2738 sr_sal
.pc
= ADDR_BITS_REMOVE (frame_pc_unwind (get_current_frame ()));
2739 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2741 check_for_old_step_resume_breakpoint ();
2743 /* NOTE: cagney/2004-03-31: Code using the current value of
2744 "step_frame_id", instead of unwinding that frame ID, removed. On
2745 s390 GNU/Linux, after taking a signal, the program is directly
2746 resumed at the signal handler and, consequently, the PC would
2747 point at at the first instruction of that signal handler but
2748 STEP_FRAME_ID would [incorrectly] at the interrupted code when it
2749 should point at the signal trampoline. By always and locally
2750 doing a frame ID unwind, it's possible to assert that the code is
2751 always using the correct ID. */
2752 sr_id
= frame_unwind_id (get_current_frame ());
2754 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
2756 if (breakpoints_inserted
)
2757 insert_breakpoints ();
2761 stop_stepping (struct execution_control_state
*ecs
)
2763 /* Let callers know we don't want to wait for the inferior anymore. */
2764 ecs
->wait_some_more
= 0;
2767 /* This function handles various cases where we need to continue
2768 waiting for the inferior. */
2769 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2772 keep_going (struct execution_control_state
*ecs
)
2774 /* Save the pc before execution, to compare with pc after stop. */
2775 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2777 if (ecs
->update_step_sp
)
2778 step_sp
= read_sp ();
2779 ecs
->update_step_sp
= 0;
2781 /* If we did not do break;, it means we should keep running the
2782 inferior and not return to debugger. */
2784 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2786 /* We took a signal (which we are supposed to pass through to
2787 the inferior, else we'd have done a break above) and we
2788 haven't yet gotten our trap. Simply continue. */
2789 resume (currently_stepping (ecs
), stop_signal
);
2793 /* Either the trap was not expected, but we are continuing
2794 anyway (the user asked that this signal be passed to the
2797 The signal was SIGTRAP, e.g. it was our signal, but we
2798 decided we should resume from it.
2800 We're going to run this baby now!
2802 Insert breakpoints now, unless we are trying to one-proceed
2803 past a breakpoint. */
2804 /* If we've just finished a special step resume and we don't
2805 want to hit a breakpoint, pull em out. */
2806 if (step_resume_breakpoint
== NULL
2807 && ecs
->remove_breakpoints_on_following_step
)
2809 ecs
->remove_breakpoints_on_following_step
= 0;
2810 remove_breakpoints ();
2811 breakpoints_inserted
= 0;
2813 else if (!breakpoints_inserted
&& !ecs
->another_trap
)
2815 breakpoints_failed
= insert_breakpoints ();
2816 if (breakpoints_failed
)
2818 stop_stepping (ecs
);
2821 breakpoints_inserted
= 1;
2824 trap_expected
= ecs
->another_trap
;
2826 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2827 specifies that such a signal should be delivered to the
2830 Typically, this would occure when a user is debugging a
2831 target monitor on a simulator: the target monitor sets a
2832 breakpoint; the simulator encounters this break-point and
2833 halts the simulation handing control to GDB; GDB, noteing
2834 that the break-point isn't valid, returns control back to the
2835 simulator; the simulator then delivers the hardware
2836 equivalent of a SIGNAL_TRAP to the program being debugged. */
2838 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2839 stop_signal
= TARGET_SIGNAL_0
;
2842 resume (currently_stepping (ecs
), stop_signal
);
2845 prepare_to_wait (ecs
);
2848 /* This function normally comes after a resume, before
2849 handle_inferior_event exits. It takes care of any last bits of
2850 housekeeping, and sets the all-important wait_some_more flag. */
2853 prepare_to_wait (struct execution_control_state
*ecs
)
2855 if (ecs
->infwait_state
== infwait_normal_state
)
2857 overlay_cache_invalid
= 1;
2859 /* We have to invalidate the registers BEFORE calling
2860 target_wait because they can be loaded from the target while
2861 in target_wait. This makes remote debugging a bit more
2862 efficient for those targets that provide critical registers
2863 as part of their normal status mechanism. */
2865 registers_changed ();
2866 ecs
->waiton_ptid
= pid_to_ptid (-1);
2867 ecs
->wp
= &(ecs
->ws
);
2869 /* This is the old end of the while loop. Let everybody know we
2870 want to wait for the inferior some more and get called again
2872 ecs
->wait_some_more
= 1;
2875 /* Print why the inferior has stopped. We always print something when
2876 the inferior exits, or receives a signal. The rest of the cases are
2877 dealt with later on in normal_stop() and print_it_typical(). Ideally
2878 there should be a call to this function from handle_inferior_event()
2879 each time stop_stepping() is called.*/
2881 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2883 switch (stop_reason
)
2886 /* We don't deal with these cases from handle_inferior_event()
2889 case END_STEPPING_RANGE
:
2890 /* We are done with a step/next/si/ni command. */
2891 /* For now print nothing. */
2892 /* Print a message only if not in the middle of doing a "step n"
2893 operation for n > 1 */
2894 if (!step_multi
|| !stop_step
)
2895 if (ui_out_is_mi_like_p (uiout
))
2896 ui_out_field_string (uiout
, "reason", "end-stepping-range");
2898 case BREAKPOINT_HIT
:
2899 /* We found a breakpoint. */
2900 /* For now print nothing. */
2903 /* The inferior was terminated by a signal. */
2904 annotate_signalled ();
2905 if (ui_out_is_mi_like_p (uiout
))
2906 ui_out_field_string (uiout
, "reason", "exited-signalled");
2907 ui_out_text (uiout
, "\nProgram terminated with signal ");
2908 annotate_signal_name ();
2909 ui_out_field_string (uiout
, "signal-name",
2910 target_signal_to_name (stop_info
));
2911 annotate_signal_name_end ();
2912 ui_out_text (uiout
, ", ");
2913 annotate_signal_string ();
2914 ui_out_field_string (uiout
, "signal-meaning",
2915 target_signal_to_string (stop_info
));
2916 annotate_signal_string_end ();
2917 ui_out_text (uiout
, ".\n");
2918 ui_out_text (uiout
, "The program no longer exists.\n");
2921 /* The inferior program is finished. */
2922 annotate_exited (stop_info
);
2925 if (ui_out_is_mi_like_p (uiout
))
2926 ui_out_field_string (uiout
, "reason", "exited");
2927 ui_out_text (uiout
, "\nProgram exited with code ");
2928 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2929 (unsigned int) stop_info
);
2930 ui_out_text (uiout
, ".\n");
2934 if (ui_out_is_mi_like_p (uiout
))
2935 ui_out_field_string (uiout
, "reason", "exited-normally");
2936 ui_out_text (uiout
, "\nProgram exited normally.\n");
2939 case SIGNAL_RECEIVED
:
2940 /* Signal received. The signal table tells us to print about
2943 ui_out_text (uiout
, "\nProgram received signal ");
2944 annotate_signal_name ();
2945 if (ui_out_is_mi_like_p (uiout
))
2946 ui_out_field_string (uiout
, "reason", "signal-received");
2947 ui_out_field_string (uiout
, "signal-name",
2948 target_signal_to_name (stop_info
));
2949 annotate_signal_name_end ();
2950 ui_out_text (uiout
, ", ");
2951 annotate_signal_string ();
2952 ui_out_field_string (uiout
, "signal-meaning",
2953 target_signal_to_string (stop_info
));
2954 annotate_signal_string_end ();
2955 ui_out_text (uiout
, ".\n");
2958 internal_error (__FILE__
, __LINE__
,
2959 "print_stop_reason: unrecognized enum value");
2965 /* Here to return control to GDB when the inferior stops for real.
2966 Print appropriate messages, remove breakpoints, give terminal our modes.
2968 STOP_PRINT_FRAME nonzero means print the executing frame
2969 (pc, function, args, file, line number and line text).
2970 BREAKPOINTS_FAILED nonzero means stop was due to error
2971 attempting to insert breakpoints. */
2976 struct target_waitstatus last
;
2979 get_last_target_status (&last_ptid
, &last
);
2981 /* As with the notification of thread events, we want to delay
2982 notifying the user that we've switched thread context until
2983 the inferior actually stops.
2985 There's no point in saying anything if the inferior has exited.
2986 Note that SIGNALLED here means "exited with a signal", not
2987 "received a signal". */
2988 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
2989 && target_has_execution
2990 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
2991 && last
.kind
!= TARGET_WAITKIND_EXITED
)
2993 target_terminal_ours_for_output ();
2994 printf_filtered ("[Switching to %s]\n",
2995 target_pid_or_tid_to_str (inferior_ptid
));
2996 previous_inferior_ptid
= inferior_ptid
;
2999 /* NOTE drow/2004-01-17: Is this still necessary? */
3000 /* Make sure that the current_frame's pc is correct. This
3001 is a correction for setting up the frame info before doing
3002 DECR_PC_AFTER_BREAK */
3003 if (target_has_execution
)
3004 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3005 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3006 frame code to check for this and sort out any resultant mess.
3007 DECR_PC_AFTER_BREAK needs to just go away. */
3008 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3010 if (target_has_execution
&& breakpoints_inserted
)
3012 if (remove_breakpoints ())
3014 target_terminal_ours_for_output ();
3015 printf_filtered ("Cannot remove breakpoints because ");
3016 printf_filtered ("program is no longer writable.\n");
3017 printf_filtered ("It might be running in another process.\n");
3018 printf_filtered ("Further execution is probably impossible.\n");
3021 breakpoints_inserted
= 0;
3023 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3024 Delete any breakpoint that is to be deleted at the next stop. */
3026 breakpoint_auto_delete (stop_bpstat
);
3028 /* If an auto-display called a function and that got a signal,
3029 delete that auto-display to avoid an infinite recursion. */
3031 if (stopped_by_random_signal
)
3032 disable_current_display ();
3034 /* Don't print a message if in the middle of doing a "step n"
3035 operation for n > 1 */
3036 if (step_multi
&& stop_step
)
3039 target_terminal_ours ();
3041 /* Look up the hook_stop and run it (CLI internally handles problem
3042 of stop_command's pre-hook not existing). */
3044 catch_errors (hook_stop_stub
, stop_command
,
3045 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3047 if (!target_has_stack
)
3053 /* Select innermost stack frame - i.e., current frame is frame 0,
3054 and current location is based on that.
3055 Don't do this on return from a stack dummy routine,
3056 or if the program has exited. */
3058 if (!stop_stack_dummy
)
3060 select_frame (get_current_frame ());
3062 /* Print current location without a level number, if
3063 we have changed functions or hit a breakpoint.
3064 Print source line if we have one.
3065 bpstat_print() contains the logic deciding in detail
3066 what to print, based on the event(s) that just occurred. */
3068 if (stop_print_frame
&& deprecated_selected_frame
)
3072 int do_frame_printing
= 1;
3074 bpstat_ret
= bpstat_print (stop_bpstat
);
3078 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3079 (or should) carry around the function and does (or
3080 should) use that when doing a frame comparison. */
3082 && frame_id_eq (step_frame_id
,
3083 get_frame_id (get_current_frame ()))
3084 && step_start_function
== find_pc_function (stop_pc
))
3085 source_flag
= SRC_LINE
; /* finished step, just print source line */
3087 source_flag
= SRC_AND_LOC
; /* print location and source line */
3089 case PRINT_SRC_AND_LOC
:
3090 source_flag
= SRC_AND_LOC
; /* print location and source line */
3092 case PRINT_SRC_ONLY
:
3093 source_flag
= SRC_LINE
;
3096 source_flag
= SRC_LINE
; /* something bogus */
3097 do_frame_printing
= 0;
3100 internal_error (__FILE__
, __LINE__
, "Unknown value.");
3102 /* For mi, have the same behavior every time we stop:
3103 print everything but the source line. */
3104 if (ui_out_is_mi_like_p (uiout
))
3105 source_flag
= LOC_AND_ADDRESS
;
3107 if (ui_out_is_mi_like_p (uiout
))
3108 ui_out_field_int (uiout
, "thread-id",
3109 pid_to_thread_id (inferior_ptid
));
3110 /* The behavior of this routine with respect to the source
3112 SRC_LINE: Print only source line
3113 LOCATION: Print only location
3114 SRC_AND_LOC: Print location and source line */
3115 if (do_frame_printing
)
3116 print_stack_frame (get_selected_frame (), 0, source_flag
);
3118 /* Display the auto-display expressions. */
3123 /* Save the function value return registers, if we care.
3124 We might be about to restore their previous contents. */
3125 if (proceed_to_finish
)
3126 /* NB: The copy goes through to the target picking up the value of
3127 all the registers. */
3128 regcache_cpy (stop_registers
, current_regcache
);
3130 if (stop_stack_dummy
)
3132 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3133 ends with a setting of the current frame, so we can use that
3135 frame_pop (get_current_frame ());
3136 /* Set stop_pc to what it was before we called the function.
3137 Can't rely on restore_inferior_status because that only gets
3138 called if we don't stop in the called function. */
3139 stop_pc
= read_pc ();
3140 select_frame (get_current_frame ());
3144 annotate_stopped ();
3145 observer_notify_normal_stop (stop_bpstat
);
3149 hook_stop_stub (void *cmd
)
3151 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3156 signal_stop_state (int signo
)
3158 return signal_stop
[signo
];
3162 signal_print_state (int signo
)
3164 return signal_print
[signo
];
3168 signal_pass_state (int signo
)
3170 return signal_program
[signo
];
3174 signal_stop_update (int signo
, int state
)
3176 int ret
= signal_stop
[signo
];
3177 signal_stop
[signo
] = state
;
3182 signal_print_update (int signo
, int state
)
3184 int ret
= signal_print
[signo
];
3185 signal_print
[signo
] = state
;
3190 signal_pass_update (int signo
, int state
)
3192 int ret
= signal_program
[signo
];
3193 signal_program
[signo
] = state
;
3198 sig_print_header (void)
3201 Signal Stop\tPrint\tPass to program\tDescription\n");
3205 sig_print_info (enum target_signal oursig
)
3207 char *name
= target_signal_to_name (oursig
);
3208 int name_padding
= 13 - strlen (name
);
3210 if (name_padding
<= 0)
3213 printf_filtered ("%s", name
);
3214 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3215 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3216 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3217 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3218 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3221 /* Specify how various signals in the inferior should be handled. */
3224 handle_command (char *args
, int from_tty
)
3227 int digits
, wordlen
;
3228 int sigfirst
, signum
, siglast
;
3229 enum target_signal oursig
;
3232 unsigned char *sigs
;
3233 struct cleanup
*old_chain
;
3237 error_no_arg ("signal to handle");
3240 /* Allocate and zero an array of flags for which signals to handle. */
3242 nsigs
= (int) TARGET_SIGNAL_LAST
;
3243 sigs
= (unsigned char *) alloca (nsigs
);
3244 memset (sigs
, 0, nsigs
);
3246 /* Break the command line up into args. */
3248 argv
= buildargv (args
);
3253 old_chain
= make_cleanup_freeargv (argv
);
3255 /* Walk through the args, looking for signal oursigs, signal names, and
3256 actions. Signal numbers and signal names may be interspersed with
3257 actions, with the actions being performed for all signals cumulatively
3258 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3260 while (*argv
!= NULL
)
3262 wordlen
= strlen (*argv
);
3263 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3267 sigfirst
= siglast
= -1;
3269 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3271 /* Apply action to all signals except those used by the
3272 debugger. Silently skip those. */
3275 siglast
= nsigs
- 1;
3277 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3279 SET_SIGS (nsigs
, sigs
, signal_stop
);
3280 SET_SIGS (nsigs
, sigs
, signal_print
);
3282 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3284 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3286 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3288 SET_SIGS (nsigs
, sigs
, signal_print
);
3290 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3292 SET_SIGS (nsigs
, sigs
, signal_program
);
3294 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3296 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3298 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3300 SET_SIGS (nsigs
, sigs
, signal_program
);
3302 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3304 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3305 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3307 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3309 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3311 else if (digits
> 0)
3313 /* It is numeric. The numeric signal refers to our own
3314 internal signal numbering from target.h, not to host/target
3315 signal number. This is a feature; users really should be
3316 using symbolic names anyway, and the common ones like
3317 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3319 sigfirst
= siglast
= (int)
3320 target_signal_from_command (atoi (*argv
));
3321 if ((*argv
)[digits
] == '-')
3324 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3326 if (sigfirst
> siglast
)
3328 /* Bet he didn't figure we'd think of this case... */
3336 oursig
= target_signal_from_name (*argv
);
3337 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3339 sigfirst
= siglast
= (int) oursig
;
3343 /* Not a number and not a recognized flag word => complain. */
3344 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3348 /* If any signal numbers or symbol names were found, set flags for
3349 which signals to apply actions to. */
3351 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3353 switch ((enum target_signal
) signum
)
3355 case TARGET_SIGNAL_TRAP
:
3356 case TARGET_SIGNAL_INT
:
3357 if (!allsigs
&& !sigs
[signum
])
3359 if (query ("%s is used by the debugger.\n\
3360 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3366 printf_unfiltered ("Not confirmed, unchanged.\n");
3367 gdb_flush (gdb_stdout
);
3371 case TARGET_SIGNAL_0
:
3372 case TARGET_SIGNAL_DEFAULT
:
3373 case TARGET_SIGNAL_UNKNOWN
:
3374 /* Make sure that "all" doesn't print these. */
3385 target_notice_signals (inferior_ptid
);
3389 /* Show the results. */
3390 sig_print_header ();
3391 for (signum
= 0; signum
< nsigs
; signum
++)
3395 sig_print_info (signum
);
3400 do_cleanups (old_chain
);
3404 xdb_handle_command (char *args
, int from_tty
)
3407 struct cleanup
*old_chain
;
3409 /* Break the command line up into args. */
3411 argv
= buildargv (args
);
3416 old_chain
= make_cleanup_freeargv (argv
);
3417 if (argv
[1] != (char *) NULL
)
3422 bufLen
= strlen (argv
[0]) + 20;
3423 argBuf
= (char *) xmalloc (bufLen
);
3427 enum target_signal oursig
;
3429 oursig
= target_signal_from_name (argv
[0]);
3430 memset (argBuf
, 0, bufLen
);
3431 if (strcmp (argv
[1], "Q") == 0)
3432 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3435 if (strcmp (argv
[1], "s") == 0)
3437 if (!signal_stop
[oursig
])
3438 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3440 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3442 else if (strcmp (argv
[1], "i") == 0)
3444 if (!signal_program
[oursig
])
3445 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3447 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3449 else if (strcmp (argv
[1], "r") == 0)
3451 if (!signal_print
[oursig
])
3452 sprintf (argBuf
, "%s %s", argv
[0], "print");
3454 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3460 handle_command (argBuf
, from_tty
);
3462 printf_filtered ("Invalid signal handling flag.\n");
3467 do_cleanups (old_chain
);
3470 /* Print current contents of the tables set by the handle command.
3471 It is possible we should just be printing signals actually used
3472 by the current target (but for things to work right when switching
3473 targets, all signals should be in the signal tables). */
3476 signals_info (char *signum_exp
, int from_tty
)
3478 enum target_signal oursig
;
3479 sig_print_header ();
3483 /* First see if this is a symbol name. */
3484 oursig
= target_signal_from_name (signum_exp
);
3485 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3487 /* No, try numeric. */
3489 target_signal_from_command (parse_and_eval_long (signum_exp
));
3491 sig_print_info (oursig
);
3495 printf_filtered ("\n");
3496 /* These ugly casts brought to you by the native VAX compiler. */
3497 for (oursig
= TARGET_SIGNAL_FIRST
;
3498 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3499 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3503 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3504 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3505 sig_print_info (oursig
);
3508 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3511 struct inferior_status
3513 enum target_signal stop_signal
;
3517 int stop_stack_dummy
;
3518 int stopped_by_random_signal
;
3520 CORE_ADDR step_range_start
;
3521 CORE_ADDR step_range_end
;
3522 struct frame_id step_frame_id
;
3523 enum step_over_calls_kind step_over_calls
;
3524 CORE_ADDR step_resume_break_address
;
3525 int stop_after_trap
;
3527 struct regcache
*stop_registers
;
3529 /* These are here because if call_function_by_hand has written some
3530 registers and then decides to call error(), we better not have changed
3532 struct regcache
*registers
;
3534 /* A frame unique identifier. */
3535 struct frame_id selected_frame_id
;
3537 int breakpoint_proceeded
;
3538 int restore_stack_info
;
3539 int proceed_to_finish
;
3543 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3546 int size
= DEPRECATED_REGISTER_RAW_SIZE (regno
);
3547 void *buf
= alloca (size
);
3548 store_signed_integer (buf
, size
, val
);
3549 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3552 /* Save all of the information associated with the inferior<==>gdb
3553 connection. INF_STATUS is a pointer to a "struct inferior_status"
3554 (defined in inferior.h). */
3556 struct inferior_status
*
3557 save_inferior_status (int restore_stack_info
)
3559 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3561 inf_status
->stop_signal
= stop_signal
;
3562 inf_status
->stop_pc
= stop_pc
;
3563 inf_status
->stop_step
= stop_step
;
3564 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3565 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3566 inf_status
->trap_expected
= trap_expected
;
3567 inf_status
->step_range_start
= step_range_start
;
3568 inf_status
->step_range_end
= step_range_end
;
3569 inf_status
->step_frame_id
= step_frame_id
;
3570 inf_status
->step_over_calls
= step_over_calls
;
3571 inf_status
->stop_after_trap
= stop_after_trap
;
3572 inf_status
->stop_soon
= stop_soon
;
3573 /* Save original bpstat chain here; replace it with copy of chain.
3574 If caller's caller is walking the chain, they'll be happier if we
3575 hand them back the original chain when restore_inferior_status is
3577 inf_status
->stop_bpstat
= stop_bpstat
;
3578 stop_bpstat
= bpstat_copy (stop_bpstat
);
3579 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3580 inf_status
->restore_stack_info
= restore_stack_info
;
3581 inf_status
->proceed_to_finish
= proceed_to_finish
;
3583 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3585 inf_status
->registers
= regcache_dup (current_regcache
);
3587 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3592 restore_selected_frame (void *args
)
3594 struct frame_id
*fid
= (struct frame_id
*) args
;
3595 struct frame_info
*frame
;
3597 frame
= frame_find_by_id (*fid
);
3599 /* If inf_status->selected_frame_id is NULL, there was no previously
3603 warning ("Unable to restore previously selected frame.\n");
3607 select_frame (frame
);
3613 restore_inferior_status (struct inferior_status
*inf_status
)
3615 stop_signal
= inf_status
->stop_signal
;
3616 stop_pc
= inf_status
->stop_pc
;
3617 stop_step
= inf_status
->stop_step
;
3618 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3619 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3620 trap_expected
= inf_status
->trap_expected
;
3621 step_range_start
= inf_status
->step_range_start
;
3622 step_range_end
= inf_status
->step_range_end
;
3623 step_frame_id
= inf_status
->step_frame_id
;
3624 step_over_calls
= inf_status
->step_over_calls
;
3625 stop_after_trap
= inf_status
->stop_after_trap
;
3626 stop_soon
= inf_status
->stop_soon
;
3627 bpstat_clear (&stop_bpstat
);
3628 stop_bpstat
= inf_status
->stop_bpstat
;
3629 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3630 proceed_to_finish
= inf_status
->proceed_to_finish
;
3632 /* FIXME: Is the restore of stop_registers always needed. */
3633 regcache_xfree (stop_registers
);
3634 stop_registers
= inf_status
->stop_registers
;
3636 /* The inferior can be gone if the user types "print exit(0)"
3637 (and perhaps other times). */
3638 if (target_has_execution
)
3639 /* NB: The register write goes through to the target. */
3640 regcache_cpy (current_regcache
, inf_status
->registers
);
3641 regcache_xfree (inf_status
->registers
);
3643 /* FIXME: If we are being called after stopping in a function which
3644 is called from gdb, we should not be trying to restore the
3645 selected frame; it just prints a spurious error message (The
3646 message is useful, however, in detecting bugs in gdb (like if gdb
3647 clobbers the stack)). In fact, should we be restoring the
3648 inferior status at all in that case? . */
3650 if (target_has_stack
&& inf_status
->restore_stack_info
)
3652 /* The point of catch_errors is that if the stack is clobbered,
3653 walking the stack might encounter a garbage pointer and
3654 error() trying to dereference it. */
3656 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3657 "Unable to restore previously selected frame:\n",
3658 RETURN_MASK_ERROR
) == 0)
3659 /* Error in restoring the selected frame. Select the innermost
3661 select_frame (get_current_frame ());
3669 do_restore_inferior_status_cleanup (void *sts
)
3671 restore_inferior_status (sts
);
3675 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3677 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3681 discard_inferior_status (struct inferior_status
*inf_status
)
3683 /* See save_inferior_status for info on stop_bpstat. */
3684 bpstat_clear (&inf_status
->stop_bpstat
);
3685 regcache_xfree (inf_status
->registers
);
3686 regcache_xfree (inf_status
->stop_registers
);
3691 inferior_has_forked (int pid
, int *child_pid
)
3693 struct target_waitstatus last
;
3696 get_last_target_status (&last_ptid
, &last
);
3698 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3701 if (ptid_get_pid (last_ptid
) != pid
)
3704 *child_pid
= last
.value
.related_pid
;
3709 inferior_has_vforked (int pid
, int *child_pid
)
3711 struct target_waitstatus last
;
3714 get_last_target_status (&last_ptid
, &last
);
3716 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3719 if (ptid_get_pid (last_ptid
) != pid
)
3722 *child_pid
= last
.value
.related_pid
;
3727 inferior_has_execd (int pid
, char **execd_pathname
)
3729 struct target_waitstatus last
;
3732 get_last_target_status (&last_ptid
, &last
);
3734 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3737 if (ptid_get_pid (last_ptid
) != pid
)
3740 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3744 /* Oft used ptids */
3746 ptid_t minus_one_ptid
;
3748 /* Create a ptid given the necessary PID, LWP, and TID components. */
3751 ptid_build (int pid
, long lwp
, long tid
)
3761 /* Create a ptid from just a pid. */
3764 pid_to_ptid (int pid
)
3766 return ptid_build (pid
, 0, 0);
3769 /* Fetch the pid (process id) component from a ptid. */
3772 ptid_get_pid (ptid_t ptid
)
3777 /* Fetch the lwp (lightweight process) component from a ptid. */
3780 ptid_get_lwp (ptid_t ptid
)
3785 /* Fetch the tid (thread id) component from a ptid. */
3788 ptid_get_tid (ptid_t ptid
)
3793 /* ptid_equal() is used to test equality of two ptids. */
3796 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3798 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3799 && ptid1
.tid
== ptid2
.tid
);
3802 /* restore_inferior_ptid() will be used by the cleanup machinery
3803 to restore the inferior_ptid value saved in a call to
3804 save_inferior_ptid(). */
3807 restore_inferior_ptid (void *arg
)
3809 ptid_t
*saved_ptid_ptr
= arg
;
3810 inferior_ptid
= *saved_ptid_ptr
;
3814 /* Save the value of inferior_ptid so that it may be restored by a
3815 later call to do_cleanups(). Returns the struct cleanup pointer
3816 needed for later doing the cleanup. */
3819 save_inferior_ptid (void)
3821 ptid_t
*saved_ptid_ptr
;
3823 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3824 *saved_ptid_ptr
= inferior_ptid
;
3825 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3832 stop_registers
= regcache_xmalloc (current_gdbarch
);
3836 _initialize_infrun (void)
3840 struct cmd_list_element
*c
;
3842 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers
);
3843 deprecated_register_gdbarch_swap (NULL
, 0, build_infrun
);
3845 add_info ("signals", signals_info
,
3846 "What debugger does when program gets various signals.\n\
3847 Specify a signal as argument to print info on that signal only.");
3848 add_info_alias ("handle", "signals", 0);
3850 add_com ("handle", class_run
, handle_command
,
3851 concat ("Specify how to handle a signal.\n\
3852 Args are signals and actions to apply to those signals.\n\
3853 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3854 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3855 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3856 The special arg \"all\" is recognized to mean all signals except those\n\
3857 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3858 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3859 Stop means reenter debugger if this signal happens (implies print).\n\
3860 Print means print a message if this signal happens.\n\
3861 Pass means let program see this signal; otherwise program doesn't know.\n\
3862 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3863 Pass and Stop may be combined.", NULL
));
3866 add_com ("lz", class_info
, signals_info
,
3867 "What debugger does when program gets various signals.\n\
3868 Specify a signal as argument to print info on that signal only.");
3869 add_com ("z", class_run
, xdb_handle_command
,
3870 concat ("Specify how to handle a signal.\n\
3871 Args are signals and actions to apply to those signals.\n\
3872 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3873 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3874 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3875 The special arg \"all\" is recognized to mean all signals except those\n\
3876 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3877 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3878 nopass), \"Q\" (noprint)\n\
3879 Stop means reenter debugger if this signal happens (implies print).\n\
3880 Print means print a message if this signal happens.\n\
3881 Pass means let program see this signal; otherwise program doesn't know.\n\
3882 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3883 Pass and Stop may be combined.", NULL
));
3888 add_cmd ("stop", class_obscure
, not_just_help_class_command
, "There is no `stop' command, but you can set a hook on `stop'.\n\
3889 This allows you to set a list of commands to be run each time execution\n\
3890 of the program stops.", &cmdlist
);
3892 numsigs
= (int) TARGET_SIGNAL_LAST
;
3893 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3894 signal_print
= (unsigned char *)
3895 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3896 signal_program
= (unsigned char *)
3897 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3898 for (i
= 0; i
< numsigs
; i
++)
3901 signal_print
[i
] = 1;
3902 signal_program
[i
] = 1;
3905 /* Signals caused by debugger's own actions
3906 should not be given to the program afterwards. */
3907 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3908 signal_program
[TARGET_SIGNAL_INT
] = 0;
3910 /* Signals that are not errors should not normally enter the debugger. */
3911 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3912 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3913 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3914 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3915 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3916 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3917 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3918 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3919 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3920 signal_print
[TARGET_SIGNAL_IO
] = 0;
3921 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3922 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3923 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3924 signal_print
[TARGET_SIGNAL_URG
] = 0;
3925 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
3926 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
3928 /* These signals are used internally by user-level thread
3929 implementations. (See signal(5) on Solaris.) Like the above
3930 signals, a healthy program receives and handles them as part of
3931 its normal operation. */
3932 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
3933 signal_print
[TARGET_SIGNAL_LWP
] = 0;
3934 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
3935 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
3936 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
3937 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
3941 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
3942 (char *) &stop_on_solib_events
,
3943 "Set stopping for shared library events.\n\
3944 If nonzero, gdb will give control to the user when the dynamic linker\n\
3945 notifies gdb of shared library events. The most common event of interest\n\
3946 to the user would be loading/unloading of a new library.\n", &setlist
), &showlist
);
3949 c
= add_set_enum_cmd ("follow-fork-mode",
3951 follow_fork_mode_kind_names
, &follow_fork_mode_string
,
3952 "Set debugger response to a program call of fork \
3954 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3955 parent - the original process is debugged after a fork\n\
3956 child - the new process is debugged after a fork\n\
3957 The unfollowed process will continue to run.\n\
3958 By default, the debugger will follow the parent process.", &setlist
);
3959 add_show_from_set (c
, &showlist
);
3961 c
= add_set_enum_cmd ("scheduler-locking", class_run
, scheduler_enums
, /* array of string names */
3962 &scheduler_mode
, /* current mode */
3963 "Set mode for locking scheduler during execution.\n\
3964 off == no locking (threads may preempt at any time)\n\
3965 on == full locking (no thread except the current thread may run)\n\
3966 step == scheduler locked during every single-step operation.\n\
3967 In this mode, no other thread may run during a step command.\n\
3968 Other threads may run while stepping over a function call ('next').", &setlist
);
3970 set_cmd_sfunc (c
, set_schedlock_func
); /* traps on target vector */
3971 add_show_from_set (c
, &showlist
);
3973 c
= add_set_cmd ("step-mode", class_run
,
3974 var_boolean
, (char *) &step_stop_if_no_debug
,
3975 "Set mode of the step operation. When set, doing a step over a\n\
3976 function without debug line information will stop at the first\n\
3977 instruction of that function. Otherwise, the function is skipped and\n\
3978 the step command stops at a different source line.", &setlist
);
3979 add_show_from_set (c
, &showlist
);
3981 /* ptid initializations */
3982 null_ptid
= ptid_build (0, 0, 0);
3983 minus_one_ptid
= ptid_build (-1, 0, 0);
3984 inferior_ptid
= null_ptid
;
3985 target_last_wait_ptid
= minus_one_ptid
;