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 insert_step_resume_breakpoint (struct frame_info
*step_frame
,
972 struct execution_control_state
*ecs
);
973 static void stop_stepping (struct execution_control_state
*ecs
);
974 static void prepare_to_wait (struct execution_control_state
*ecs
);
975 static void keep_going (struct execution_control_state
*ecs
);
976 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
979 /* Wait for control to return from inferior to debugger.
980 If inferior gets a signal, we may decide to start it up again
981 instead of returning. That is why there is a loop in this function.
982 When this function actually returns it means the inferior
983 should be left stopped and GDB should read more commands. */
986 wait_for_inferior (void)
988 struct cleanup
*old_cleanups
;
989 struct execution_control_state ecss
;
990 struct execution_control_state
*ecs
;
992 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
993 &step_resume_breakpoint
);
995 /* wfi still stays in a loop, so it's OK just to take the address of
996 a local to get the ecs pointer. */
999 /* Fill in with reasonable starting values. */
1000 init_execution_control_state (ecs
);
1002 /* We'll update this if & when we switch to a new thread. */
1003 previous_inferior_ptid
= inferior_ptid
;
1005 overlay_cache_invalid
= 1;
1007 /* We have to invalidate the registers BEFORE calling target_wait
1008 because they can be loaded from the target while in target_wait.
1009 This makes remote debugging a bit more efficient for those
1010 targets that provide critical registers as part of their normal
1011 status mechanism. */
1013 registers_changed ();
1017 if (deprecated_target_wait_hook
)
1018 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1020 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1022 /* Now figure out what to do with the result of the result. */
1023 handle_inferior_event (ecs
);
1025 if (!ecs
->wait_some_more
)
1028 do_cleanups (old_cleanups
);
1031 /* Asynchronous version of wait_for_inferior. It is called by the
1032 event loop whenever a change of state is detected on the file
1033 descriptor corresponding to the target. It can be called more than
1034 once to complete a single execution command. In such cases we need
1035 to keep the state in a global variable ASYNC_ECSS. If it is the
1036 last time that this function is called for a single execution
1037 command, then report to the user that the inferior has stopped, and
1038 do the necessary cleanups. */
1040 struct execution_control_state async_ecss
;
1041 struct execution_control_state
*async_ecs
;
1044 fetch_inferior_event (void *client_data
)
1046 static struct cleanup
*old_cleanups
;
1048 async_ecs
= &async_ecss
;
1050 if (!async_ecs
->wait_some_more
)
1052 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1053 &step_resume_breakpoint
);
1055 /* Fill in with reasonable starting values. */
1056 init_execution_control_state (async_ecs
);
1058 /* We'll update this if & when we switch to a new thread. */
1059 previous_inferior_ptid
= inferior_ptid
;
1061 overlay_cache_invalid
= 1;
1063 /* We have to invalidate the registers BEFORE calling target_wait
1064 because they can be loaded from the target while in target_wait.
1065 This makes remote debugging a bit more efficient for those
1066 targets that provide critical registers as part of their normal
1067 status mechanism. */
1069 registers_changed ();
1072 if (deprecated_target_wait_hook
)
1074 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1076 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1078 /* Now figure out what to do with the result of the result. */
1079 handle_inferior_event (async_ecs
);
1081 if (!async_ecs
->wait_some_more
)
1083 /* Do only the cleanups that have been added by this
1084 function. Let the continuations for the commands do the rest,
1085 if there are any. */
1086 do_exec_cleanups (old_cleanups
);
1088 if (step_multi
&& stop_step
)
1089 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1091 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1095 /* Prepare an execution control state for looping through a
1096 wait_for_inferior-type loop. */
1099 init_execution_control_state (struct execution_control_state
*ecs
)
1101 /* ecs->another_trap? */
1102 ecs
->random_signal
= 0;
1103 ecs
->remove_breakpoints_on_following_step
= 0;
1104 ecs
->handling_longjmp
= 0; /* FIXME */
1105 ecs
->update_step_sp
= 0;
1106 ecs
->stepping_through_solib_after_catch
= 0;
1107 ecs
->stepping_through_solib_catchpoints
= NULL
;
1108 ecs
->enable_hw_watchpoints_after_wait
= 0;
1109 ecs
->stepping_through_sigtramp
= 0;
1110 ecs
->sal
= find_pc_line (prev_pc
, 0);
1111 ecs
->current_line
= ecs
->sal
.line
;
1112 ecs
->current_symtab
= ecs
->sal
.symtab
;
1113 ecs
->infwait_state
= infwait_normal_state
;
1114 ecs
->waiton_ptid
= pid_to_ptid (-1);
1115 ecs
->wp
= &(ecs
->ws
);
1118 /* Call this function before setting step_resume_breakpoint, as a
1119 sanity check. There should never be more than one step-resume
1120 breakpoint per thread, so we should never be setting a new
1121 step_resume_breakpoint when one is already active. */
1123 check_for_old_step_resume_breakpoint (void)
1125 if (step_resume_breakpoint
)
1127 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1130 /* Return the cached copy of the last pid/waitstatus returned by
1131 target_wait()/deprecated_target_wait_hook(). The data is actually
1132 cached by handle_inferior_event(), which gets called immediately
1133 after target_wait()/deprecated_target_wait_hook(). */
1136 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1138 *ptidp
= target_last_wait_ptid
;
1139 *status
= target_last_waitstatus
;
1142 /* Switch thread contexts, maintaining "infrun state". */
1145 context_switch (struct execution_control_state
*ecs
)
1147 /* Caution: it may happen that the new thread (or the old one!)
1148 is not in the thread list. In this case we must not attempt
1149 to "switch context", or we run the risk that our context may
1150 be lost. This may happen as a result of the target module
1151 mishandling thread creation. */
1153 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1154 { /* Perform infrun state context switch: */
1155 /* Save infrun state for the old thread. */
1156 save_infrun_state (inferior_ptid
, prev_pc
,
1157 trap_expected
, step_resume_breakpoint
,
1159 step_range_end
, &step_frame_id
,
1160 ecs
->handling_longjmp
, ecs
->another_trap
,
1161 ecs
->stepping_through_solib_after_catch
,
1162 ecs
->stepping_through_solib_catchpoints
,
1163 ecs
->stepping_through_sigtramp
,
1164 ecs
->current_line
, ecs
->current_symtab
, step_sp
);
1166 /* Load infrun state for the new thread. */
1167 load_infrun_state (ecs
->ptid
, &prev_pc
,
1168 &trap_expected
, &step_resume_breakpoint
,
1170 &step_range_end
, &step_frame_id
,
1171 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1172 &ecs
->stepping_through_solib_after_catch
,
1173 &ecs
->stepping_through_solib_catchpoints
,
1174 &ecs
->stepping_through_sigtramp
,
1175 &ecs
->current_line
, &ecs
->current_symtab
, &step_sp
);
1177 inferior_ptid
= ecs
->ptid
;
1180 /* Handle the inferior event in the cases when we just stepped
1184 handle_step_into_function (struct execution_control_state
*ecs
)
1186 CORE_ADDR real_stop_pc
;
1188 if ((step_over_calls
== STEP_OVER_NONE
)
1189 || ((step_range_end
== 1)
1190 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
1192 /* I presume that step_over_calls is only 0 when we're
1193 supposed to be stepping at the assembly language level
1194 ("stepi"). Just stop. */
1195 /* Also, maybe we just did a "nexti" inside a prolog,
1196 so we thought it was a subroutine call but it was not.
1197 Stop as well. FENN */
1199 print_stop_reason (END_STEPPING_RANGE
, 0);
1200 stop_stepping (ecs
);
1204 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
1206 /* We're doing a "next", set a breakpoint at callee's return
1207 address (the address at which the caller will resume). */
1208 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()),
1214 /* If we are in a function call trampoline (a stub between
1215 the calling routine and the real function), locate the real
1216 function. That's what tells us (a) whether we want to step
1217 into it at all, and (b) what prologue we want to run to
1218 the end of, if we do step into it. */
1219 real_stop_pc
= skip_language_trampoline (stop_pc
);
1220 if (real_stop_pc
== 0)
1221 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
1222 if (real_stop_pc
!= 0)
1223 ecs
->stop_func_start
= real_stop_pc
;
1225 /* If we have line number information for the function we
1226 are thinking of stepping into, step into it.
1228 If there are several symtabs at that PC (e.g. with include
1229 files), just want to know whether *any* of them have line
1230 numbers. find_pc_line handles this. */
1232 struct symtab_and_line tmp_sal
;
1234 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
1235 if (tmp_sal
.line
!= 0)
1237 step_into_function (ecs
);
1242 /* If we have no line number and the step-stop-if-no-debug
1243 is set, we stop the step so that the user has a chance to
1244 switch in assembly mode. */
1245 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
1248 print_stop_reason (END_STEPPING_RANGE
, 0);
1249 stop_stepping (ecs
);
1253 /* Set a breakpoint at callee's return address (the address at which
1254 the caller will resume). */
1255 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), ecs
);
1261 adjust_pc_after_break (struct execution_control_state
*ecs
)
1265 /* If this target does not decrement the PC after breakpoints, then
1266 we have nothing to do. */
1267 if (DECR_PC_AFTER_BREAK
== 0)
1270 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1271 we aren't, just return.
1273 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1274 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1275 by software breakpoints should be handled through the normal breakpoint
1278 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1279 different signals (SIGILL or SIGEMT for instance), but it is less
1280 clear where the PC is pointing afterwards. It may not match
1281 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1282 these signals at breakpoints (the code has been in GDB since at least
1283 1992) so I can not guess how to handle them here.
1285 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1286 would have the PC after hitting a watchpoint affected by
1287 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1288 in GDB history, and it seems unlikely to be correct, so
1289 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1291 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1294 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1297 /* Find the location where (if we've hit a breakpoint) the breakpoint would
1299 stop_pc
= read_pc_pid (ecs
->ptid
) - DECR_PC_AFTER_BREAK
;
1301 /* If we're software-single-stepping, then assume this is a breakpoint.
1302 NOTE drow/2004-01-17: This doesn't check that the PC matches, or that
1303 we're even in the right thread. The software-single-step code needs
1306 If we're not software-single-stepping, then we first check that there
1307 is an enabled software breakpoint at this address. If there is, and
1308 we weren't using hardware-single-step, then we've hit the breakpoint.
1310 If we were using hardware-single-step, we check prev_pc; if we just
1311 stepped over an inserted software breakpoint, then we should decrement
1312 the PC and eventually report hitting the breakpoint. The prev_pc check
1313 prevents us from decrementing the PC if we just stepped over a jump
1314 instruction and landed on the instruction after a breakpoint.
1316 The last bit checks that we didn't hit a breakpoint in a signal handler
1317 without an intervening stop in sigtramp, which is detected by a new
1318 stack pointer value below any usual function calling stack adjustments.
1320 NOTE drow/2004-01-17: I'm not sure that this is necessary. The check
1321 predates checking for software single step at the same time. Also,
1322 if we've moved into a signal handler we should have seen the
1325 if ((SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1326 || (software_breakpoint_inserted_here_p (stop_pc
)
1327 && !(currently_stepping (ecs
)
1328 && prev_pc
!= stop_pc
1329 && !(step_range_end
&& INNER_THAN (read_sp (), (step_sp
- 16))))))
1330 write_pc_pid (stop_pc
, ecs
->ptid
);
1333 /* Given an execution control state that has been freshly filled in
1334 by an event from the inferior, figure out what it means and take
1335 appropriate action. */
1337 int stepped_after_stopped_by_watchpoint
;
1340 handle_inferior_event (struct execution_control_state
*ecs
)
1342 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1343 thinking that the variable stepped_after_stopped_by_watchpoint
1344 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1345 defined in the file "config/pa/nm-hppah.h", accesses the variable
1346 indirectly. Mutter something rude about the HP merge. */
1347 int sw_single_step_trap_p
= 0;
1349 /* Cache the last pid/waitstatus. */
1350 target_last_wait_ptid
= ecs
->ptid
;
1351 target_last_waitstatus
= *ecs
->wp
;
1353 adjust_pc_after_break (ecs
);
1355 switch (ecs
->infwait_state
)
1357 case infwait_thread_hop_state
:
1358 /* Cancel the waiton_ptid. */
1359 ecs
->waiton_ptid
= pid_to_ptid (-1);
1360 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1361 is serviced in this loop, below. */
1362 if (ecs
->enable_hw_watchpoints_after_wait
)
1364 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1365 ecs
->enable_hw_watchpoints_after_wait
= 0;
1367 stepped_after_stopped_by_watchpoint
= 0;
1370 case infwait_normal_state
:
1371 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1372 is serviced in this loop, below. */
1373 if (ecs
->enable_hw_watchpoints_after_wait
)
1375 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1376 ecs
->enable_hw_watchpoints_after_wait
= 0;
1378 stepped_after_stopped_by_watchpoint
= 0;
1381 case infwait_nullified_state
:
1382 stepped_after_stopped_by_watchpoint
= 0;
1385 case infwait_nonstep_watch_state
:
1386 insert_breakpoints ();
1388 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1389 handle things like signals arriving and other things happening
1390 in combination correctly? */
1391 stepped_after_stopped_by_watchpoint
= 1;
1395 internal_error (__FILE__
, __LINE__
, "bad switch");
1397 ecs
->infwait_state
= infwait_normal_state
;
1399 flush_cached_frames ();
1401 /* If it's a new process, add it to the thread database */
1403 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1404 && !in_thread_list (ecs
->ptid
));
1406 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1407 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1409 add_thread (ecs
->ptid
);
1411 ui_out_text (uiout
, "[New ");
1412 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1413 ui_out_text (uiout
, "]\n");
1416 /* NOTE: This block is ONLY meant to be invoked in case of a
1417 "thread creation event"! If it is invoked for any other
1418 sort of event (such as a new thread landing on a breakpoint),
1419 the event will be discarded, which is almost certainly
1422 To avoid this, the low-level module (eg. target_wait)
1423 should call in_thread_list and add_thread, so that the
1424 new thread is known by the time we get here. */
1426 /* We may want to consider not doing a resume here in order
1427 to give the user a chance to play with the new thread.
1428 It might be good to make that a user-settable option. */
1430 /* At this point, all threads are stopped (happens
1431 automatically in either the OS or the native code).
1432 Therefore we need to continue all threads in order to
1435 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1436 prepare_to_wait (ecs
);
1441 switch (ecs
->ws
.kind
)
1443 case TARGET_WAITKIND_LOADED
:
1444 /* Ignore gracefully during startup of the inferior, as it
1445 might be the shell which has just loaded some objects,
1446 otherwise add the symbols for the newly loaded objects. */
1448 if (stop_soon
== NO_STOP_QUIETLY
)
1450 /* Remove breakpoints, SOLIB_ADD might adjust
1451 breakpoint addresses via breakpoint_re_set. */
1452 if (breakpoints_inserted
)
1453 remove_breakpoints ();
1455 /* Check for any newly added shared libraries if we're
1456 supposed to be adding them automatically. Switch
1457 terminal for any messages produced by
1458 breakpoint_re_set. */
1459 target_terminal_ours_for_output ();
1460 /* NOTE: cagney/2003-11-25: Make certain that the target
1461 stack's section table is kept up-to-date. Architectures,
1462 (e.g., PPC64), use the section table to perform
1463 operations such as address => section name and hence
1464 require the table to contain all sections (including
1465 those found in shared libraries). */
1466 /* NOTE: cagney/2003-11-25: Pass current_target and not
1467 exec_ops to SOLIB_ADD. This is because current GDB is
1468 only tooled to propagate section_table changes out from
1469 the "current_target" (see target_resize_to_sections), and
1470 not up from the exec stratum. This, of course, isn't
1471 right. "infrun.c" should only interact with the
1472 exec/process stratum, instead relying on the target stack
1473 to propagate relevant changes (stop, section table
1474 changed, ...) up to other layers. */
1475 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1476 target_terminal_inferior ();
1478 /* Reinsert breakpoints and continue. */
1479 if (breakpoints_inserted
)
1480 insert_breakpoints ();
1483 resume (0, TARGET_SIGNAL_0
);
1484 prepare_to_wait (ecs
);
1487 case TARGET_WAITKIND_SPURIOUS
:
1488 resume (0, TARGET_SIGNAL_0
);
1489 prepare_to_wait (ecs
);
1492 case TARGET_WAITKIND_EXITED
:
1493 target_terminal_ours (); /* Must do this before mourn anyway */
1494 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1496 /* Record the exit code in the convenience variable $_exitcode, so
1497 that the user can inspect this again later. */
1498 set_internalvar (lookup_internalvar ("_exitcode"),
1499 value_from_longest (builtin_type_int
,
1500 (LONGEST
) ecs
->ws
.value
.integer
));
1501 gdb_flush (gdb_stdout
);
1502 target_mourn_inferior ();
1503 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1504 stop_print_frame
= 0;
1505 stop_stepping (ecs
);
1508 case TARGET_WAITKIND_SIGNALLED
:
1509 stop_print_frame
= 0;
1510 stop_signal
= ecs
->ws
.value
.sig
;
1511 target_terminal_ours (); /* Must do this before mourn anyway */
1513 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1514 reach here unless the inferior is dead. However, for years
1515 target_kill() was called here, which hints that fatal signals aren't
1516 really fatal on some systems. If that's true, then some changes
1518 target_mourn_inferior ();
1520 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1521 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1522 stop_stepping (ecs
);
1525 /* The following are the only cases in which we keep going;
1526 the above cases end in a continue or goto. */
1527 case TARGET_WAITKIND_FORKED
:
1528 case TARGET_WAITKIND_VFORKED
:
1529 stop_signal
= TARGET_SIGNAL_TRAP
;
1530 pending_follow
.kind
= ecs
->ws
.kind
;
1532 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1533 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1535 stop_pc
= read_pc ();
1537 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1539 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1541 /* If no catchpoint triggered for this, then keep going. */
1542 if (ecs
->random_signal
)
1544 stop_signal
= TARGET_SIGNAL_0
;
1548 goto process_event_stop_test
;
1550 case TARGET_WAITKIND_EXECD
:
1551 stop_signal
= TARGET_SIGNAL_TRAP
;
1553 /* NOTE drow/2002-12-05: This code should be pushed down into the
1554 target_wait function. Until then following vfork on HP/UX 10.20
1555 is probably broken by this. Of course, it's broken anyway. */
1556 /* Is this a target which reports multiple exec events per actual
1557 call to exec()? (HP-UX using ptrace does, for example.) If so,
1558 ignore all but the last one. Just resume the exec'r, and wait
1559 for the next exec event. */
1560 if (inferior_ignoring_leading_exec_events
)
1562 inferior_ignoring_leading_exec_events
--;
1563 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1564 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1566 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1567 prepare_to_wait (ecs
);
1570 inferior_ignoring_leading_exec_events
=
1571 target_reported_exec_events_per_exec_call () - 1;
1573 pending_follow
.execd_pathname
=
1574 savestring (ecs
->ws
.value
.execd_pathname
,
1575 strlen (ecs
->ws
.value
.execd_pathname
));
1577 /* This causes the eventpoints and symbol table to be reset. Must
1578 do this now, before trying to determine whether to stop. */
1579 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1580 xfree (pending_follow
.execd_pathname
);
1582 stop_pc
= read_pc_pid (ecs
->ptid
);
1583 ecs
->saved_inferior_ptid
= inferior_ptid
;
1584 inferior_ptid
= ecs
->ptid
;
1586 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1588 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1589 inferior_ptid
= ecs
->saved_inferior_ptid
;
1591 /* If no catchpoint triggered for this, then keep going. */
1592 if (ecs
->random_signal
)
1594 stop_signal
= TARGET_SIGNAL_0
;
1598 goto process_event_stop_test
;
1600 /* These syscall events are returned on HP-UX, as part of its
1601 implementation of page-protection-based "hardware" watchpoints.
1602 HP-UX has unfortunate interactions between page-protections and
1603 some system calls. Our solution is to disable hardware watches
1604 when a system call is entered, and reenable them when the syscall
1605 completes. The downside of this is that we may miss the precise
1606 point at which a watched piece of memory is modified. "Oh well."
1608 Note that we may have multiple threads running, which may each
1609 enter syscalls at roughly the same time. Since we don't have a
1610 good notion currently of whether a watched piece of memory is
1611 thread-private, we'd best not have any page-protections active
1612 when any thread is in a syscall. Thus, we only want to reenable
1613 hardware watches when no threads are in a syscall.
1615 Also, be careful not to try to gather much state about a thread
1616 that's in a syscall. It's frequently a losing proposition. */
1617 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1618 number_of_threads_in_syscalls
++;
1619 if (number_of_threads_in_syscalls
== 1)
1621 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1623 resume (0, TARGET_SIGNAL_0
);
1624 prepare_to_wait (ecs
);
1627 /* Before examining the threads further, step this thread to
1628 get it entirely out of the syscall. (We get notice of the
1629 event when the thread is just on the verge of exiting a
1630 syscall. Stepping one instruction seems to get it back
1633 Note that although the logical place to reenable h/w watches
1634 is here, we cannot. We cannot reenable them before stepping
1635 the thread (this causes the next wait on the thread to hang).
1637 Nor can we enable them after stepping until we've done a wait.
1638 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1639 here, which will be serviced immediately after the target
1641 case TARGET_WAITKIND_SYSCALL_RETURN
:
1642 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1644 if (number_of_threads_in_syscalls
> 0)
1646 number_of_threads_in_syscalls
--;
1647 ecs
->enable_hw_watchpoints_after_wait
=
1648 (number_of_threads_in_syscalls
== 0);
1650 prepare_to_wait (ecs
);
1653 case TARGET_WAITKIND_STOPPED
:
1654 stop_signal
= ecs
->ws
.value
.sig
;
1657 /* We had an event in the inferior, but we are not interested
1658 in handling it at this level. The lower layers have already
1659 done what needs to be done, if anything.
1661 One of the possible circumstances for this is when the
1662 inferior produces output for the console. The inferior has
1663 not stopped, and we are ignoring the event. Another possible
1664 circumstance is any event which the lower level knows will be
1665 reported multiple times without an intervening resume. */
1666 case TARGET_WAITKIND_IGNORE
:
1667 prepare_to_wait (ecs
);
1671 /* We may want to consider not doing a resume here in order to give
1672 the user a chance to play with the new thread. It might be good
1673 to make that a user-settable option. */
1675 /* At this point, all threads are stopped (happens automatically in
1676 either the OS or the native code). Therefore we need to continue
1677 all threads in order to make progress. */
1678 if (ecs
->new_thread_event
)
1680 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1681 prepare_to_wait (ecs
);
1685 stop_pc
= read_pc_pid (ecs
->ptid
);
1687 if (stepping_past_singlestep_breakpoint
)
1689 gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
);
1690 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1691 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1693 stepping_past_singlestep_breakpoint
= 0;
1695 /* We've either finished single-stepping past the single-step
1696 breakpoint, or stopped for some other reason. It would be nice if
1697 we could tell, but we can't reliably. */
1698 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1700 /* Pull the single step breakpoints out of the target. */
1701 SOFTWARE_SINGLE_STEP (0, 0);
1702 singlestep_breakpoints_inserted_p
= 0;
1704 ecs
->random_signal
= 0;
1706 ecs
->ptid
= saved_singlestep_ptid
;
1707 context_switch (ecs
);
1708 if (deprecated_context_hook
)
1709 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1711 resume (1, TARGET_SIGNAL_0
);
1712 prepare_to_wait (ecs
);
1717 stepping_past_singlestep_breakpoint
= 0;
1719 /* See if a thread hit a thread-specific breakpoint that was meant for
1720 another thread. If so, then step that thread past the breakpoint,
1723 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1725 int thread_hop_needed
= 0;
1727 /* Check if a regular breakpoint has been hit before checking
1728 for a potential single step breakpoint. Otherwise, GDB will
1729 not see this breakpoint hit when stepping onto breakpoints. */
1730 if (breakpoints_inserted
&& breakpoint_here_p (stop_pc
))
1732 ecs
->random_signal
= 0;
1733 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1734 thread_hop_needed
= 1;
1736 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1738 ecs
->random_signal
= 0;
1739 /* The call to in_thread_list is necessary because PTIDs sometimes
1740 change when we go from single-threaded to multi-threaded. If
1741 the singlestep_ptid is still in the list, assume that it is
1742 really different from ecs->ptid. */
1743 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1744 && in_thread_list (singlestep_ptid
))
1746 thread_hop_needed
= 1;
1747 stepping_past_singlestep_breakpoint
= 1;
1748 saved_singlestep_ptid
= singlestep_ptid
;
1752 if (thread_hop_needed
)
1756 /* Saw a breakpoint, but it was hit by the wrong thread.
1759 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1761 /* Pull the single step breakpoints out of the target. */
1762 SOFTWARE_SINGLE_STEP (0, 0);
1763 singlestep_breakpoints_inserted_p
= 0;
1766 remove_status
= remove_breakpoints ();
1767 /* Did we fail to remove breakpoints? If so, try
1768 to set the PC past the bp. (There's at least
1769 one situation in which we can fail to remove
1770 the bp's: On HP-UX's that use ttrace, we can't
1771 change the address space of a vforking child
1772 process until the child exits (well, okay, not
1773 then either :-) or execs. */
1774 if (remove_status
!= 0)
1776 /* FIXME! This is obviously non-portable! */
1777 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1778 /* We need to restart all the threads now,
1779 * unles we're running in scheduler-locked mode.
1780 * Use currently_stepping to determine whether to
1783 /* FIXME MVS: is there any reason not to call resume()? */
1784 if (scheduler_mode
== schedlock_on
)
1785 target_resume (ecs
->ptid
,
1786 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1788 target_resume (RESUME_ALL
,
1789 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1790 prepare_to_wait (ecs
);
1795 breakpoints_inserted
= 0;
1796 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1797 context_switch (ecs
);
1798 ecs
->waiton_ptid
= ecs
->ptid
;
1799 ecs
->wp
= &(ecs
->ws
);
1800 ecs
->another_trap
= 1;
1802 ecs
->infwait_state
= infwait_thread_hop_state
;
1804 registers_changed ();
1808 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1810 sw_single_step_trap_p
= 1;
1811 ecs
->random_signal
= 0;
1815 ecs
->random_signal
= 1;
1817 /* See if something interesting happened to the non-current thread. If
1818 so, then switch to that thread. */
1819 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1821 context_switch (ecs
);
1823 if (deprecated_context_hook
)
1824 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1826 flush_cached_frames ();
1829 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1831 /* Pull the single step breakpoints out of the target. */
1832 SOFTWARE_SINGLE_STEP (0, 0);
1833 singlestep_breakpoints_inserted_p
= 0;
1836 /* If PC is pointing at a nullified instruction, then step beyond
1837 it so that the user won't be confused when GDB appears to be ready
1840 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1841 if (INSTRUCTION_NULLIFIED
)
1843 registers_changed ();
1844 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1846 /* We may have received a signal that we want to pass to
1847 the inferior; therefore, we must not clobber the waitstatus
1850 ecs
->infwait_state
= infwait_nullified_state
;
1851 ecs
->waiton_ptid
= ecs
->ptid
;
1852 ecs
->wp
= &(ecs
->tmpstatus
);
1853 prepare_to_wait (ecs
);
1857 /* It may not be necessary to disable the watchpoint to stop over
1858 it. For example, the PA can (with some kernel cooperation)
1859 single step over a watchpoint without disabling the watchpoint. */
1860 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1863 prepare_to_wait (ecs
);
1867 /* It is far more common to need to disable a watchpoint to step
1868 the inferior over it. FIXME. What else might a debug
1869 register or page protection watchpoint scheme need here? */
1870 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1872 /* At this point, we are stopped at an instruction which has
1873 attempted to write to a piece of memory under control of
1874 a watchpoint. The instruction hasn't actually executed
1875 yet. If we were to evaluate the watchpoint expression
1876 now, we would get the old value, and therefore no change
1877 would seem to have occurred.
1879 In order to make watchpoints work `right', we really need
1880 to complete the memory write, and then evaluate the
1881 watchpoint expression. The following code does that by
1882 removing the watchpoint (actually, all watchpoints and
1883 breakpoints), single-stepping the target, re-inserting
1884 watchpoints, and then falling through to let normal
1885 single-step processing handle proceed. Since this
1886 includes evaluating watchpoints, things will come to a
1887 stop in the correct manner. */
1889 remove_breakpoints ();
1890 registers_changed ();
1891 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1893 ecs
->waiton_ptid
= ecs
->ptid
;
1894 ecs
->wp
= &(ecs
->ws
);
1895 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1896 prepare_to_wait (ecs
);
1900 /* It may be possible to simply continue after a watchpoint. */
1901 if (HAVE_CONTINUABLE_WATCHPOINT
)
1902 STOPPED_BY_WATCHPOINT (ecs
->ws
);
1904 ecs
->stop_func_start
= 0;
1905 ecs
->stop_func_end
= 0;
1906 ecs
->stop_func_name
= 0;
1907 /* Don't care about return value; stop_func_start and stop_func_name
1908 will both be 0 if it doesn't work. */
1909 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1910 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1911 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
1912 ecs
->another_trap
= 0;
1913 bpstat_clear (&stop_bpstat
);
1915 stop_stack_dummy
= 0;
1916 stop_print_frame
= 1;
1917 ecs
->random_signal
= 0;
1918 stopped_by_random_signal
= 0;
1919 breakpoints_failed
= 0;
1921 /* Look at the cause of the stop, and decide what to do.
1922 The alternatives are:
1923 1) break; to really stop and return to the debugger,
1924 2) drop through to start up again
1925 (set ecs->another_trap to 1 to single step once)
1926 3) set ecs->random_signal to 1, and the decision between 1 and 2
1927 will be made according to the signal handling tables. */
1929 /* First, distinguish signals caused by the debugger from signals
1930 that have to do with the program's own actions. Note that
1931 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1932 on the operating system version. Here we detect when a SIGILL or
1933 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1934 something similar for SIGSEGV, since a SIGSEGV will be generated
1935 when we're trying to execute a breakpoint instruction on a
1936 non-executable stack. This happens for call dummy breakpoints
1937 for architectures like SPARC that place call dummies on the
1940 if (stop_signal
== TARGET_SIGNAL_TRAP
1941 || (breakpoints_inserted
&&
1942 (stop_signal
== TARGET_SIGNAL_ILL
1943 || stop_signal
== TARGET_SIGNAL_SEGV
1944 || stop_signal
== TARGET_SIGNAL_EMT
))
1945 || stop_soon
== STOP_QUIETLY
1946 || stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1948 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1950 stop_print_frame
= 0;
1951 stop_stepping (ecs
);
1955 /* This is originated from start_remote(), start_inferior() and
1956 shared libraries hook functions. */
1957 if (stop_soon
== STOP_QUIETLY
)
1959 stop_stepping (ecs
);
1963 /* This originates from attach_command(). We need to overwrite
1964 the stop_signal here, because some kernels don't ignore a
1965 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1966 See more comments in inferior.h. */
1967 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1969 stop_stepping (ecs
);
1970 if (stop_signal
== TARGET_SIGNAL_STOP
)
1971 stop_signal
= TARGET_SIGNAL_0
;
1975 /* Don't even think about breakpoints if just proceeded over a
1977 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
)
1978 bpstat_clear (&stop_bpstat
);
1981 /* See if there is a breakpoint at the current PC. */
1982 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1984 /* Following in case break condition called a
1986 stop_print_frame
= 1;
1989 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1990 at one stage in the past included checks for an inferior
1991 function call's call dummy's return breakpoint. The original
1992 comment, that went with the test, read:
1994 ``End of a stack dummy. Some systems (e.g. Sony news) give
1995 another signal besides SIGTRAP, so check here as well as
1998 If someone ever tries to get get call dummys on a
1999 non-executable stack to work (where the target would stop
2000 with something like a SIGSEGV), then those tests might need
2001 to be re-instated. Given, however, that the tests were only
2002 enabled when momentary breakpoints were not being used, I
2003 suspect that it won't be the case.
2005 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2006 be necessary for call dummies on a non-executable stack on
2009 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2011 = !(bpstat_explains_signal (stop_bpstat
)
2013 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2016 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
2017 if (!ecs
->random_signal
)
2018 stop_signal
= TARGET_SIGNAL_TRAP
;
2022 /* When we reach this point, we've pretty much decided
2023 that the reason for stopping must've been a random
2024 (unexpected) signal. */
2027 ecs
->random_signal
= 1;
2029 process_event_stop_test
:
2030 /* For the program's own signals, act according to
2031 the signal handling tables. */
2033 if (ecs
->random_signal
)
2035 /* Signal not for debugging purposes. */
2038 stopped_by_random_signal
= 1;
2040 if (signal_print
[stop_signal
])
2043 target_terminal_ours_for_output ();
2044 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2046 if (signal_stop
[stop_signal
])
2048 stop_stepping (ecs
);
2051 /* If not going to stop, give terminal back
2052 if we took it away. */
2054 target_terminal_inferior ();
2056 /* Clear the signal if it should not be passed. */
2057 if (signal_program
[stop_signal
] == 0)
2058 stop_signal
= TARGET_SIGNAL_0
;
2060 if (step_range_end
!= 0
2061 && stop_signal
!= TARGET_SIGNAL_0
2062 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
2063 && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
))
2065 /* The inferior is about to take a signal that will take it
2066 out of the single step range. Set a breakpoint at the
2067 current PC (which is presumably where the signal handler
2068 will eventually return) and then allow the inferior to
2071 Note that this is only needed for a signal delivered
2072 while in the single-step range. Nested signals aren't a
2073 problem as they eventually all return. */
2074 insert_step_resume_breakpoint (get_current_frame (), ecs
);
2080 /* Handle cases caused by hitting a breakpoint. */
2082 CORE_ADDR jmp_buf_pc
;
2083 struct bpstat_what what
;
2085 what
= bpstat_what (stop_bpstat
);
2087 if (what
.call_dummy
)
2089 stop_stack_dummy
= 1;
2091 trap_expected_after_continue
= 1;
2095 switch (what
.main_action
)
2097 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2098 /* If we hit the breakpoint at longjmp, disable it for the
2099 duration of this command. Then, install a temporary
2100 breakpoint at the target of the jmp_buf. */
2101 disable_longjmp_breakpoint ();
2102 remove_breakpoints ();
2103 breakpoints_inserted
= 0;
2104 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
2110 /* Need to blow away step-resume breakpoint, as it
2111 interferes with us */
2112 if (step_resume_breakpoint
!= NULL
)
2114 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2118 /* FIXME - Need to implement nested temporary breakpoints */
2119 if (step_over_calls
> 0)
2120 set_longjmp_resume_breakpoint (jmp_buf_pc
, get_current_frame ());
2123 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2124 ecs
->handling_longjmp
= 1; /* FIXME */
2128 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2129 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2130 remove_breakpoints ();
2131 breakpoints_inserted
= 0;
2133 /* FIXME - Need to implement nested temporary breakpoints */
2135 && (frame_id_inner (get_frame_id (get_current_frame ()),
2138 ecs
->another_trap
= 1;
2143 disable_longjmp_breakpoint ();
2144 ecs
->handling_longjmp
= 0; /* FIXME */
2145 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2147 /* else fallthrough */
2149 case BPSTAT_WHAT_SINGLE
:
2150 if (breakpoints_inserted
)
2152 remove_breakpoints ();
2154 breakpoints_inserted
= 0;
2155 ecs
->another_trap
= 1;
2156 /* Still need to check other stuff, at least the case
2157 where we are stepping and step out of the right range. */
2160 case BPSTAT_WHAT_STOP_NOISY
:
2161 stop_print_frame
= 1;
2163 /* We are about to nuke the step_resume_breakpointt via the
2164 cleanup chain, so no need to worry about it here. */
2166 stop_stepping (ecs
);
2169 case BPSTAT_WHAT_STOP_SILENT
:
2170 stop_print_frame
= 0;
2172 /* We are about to nuke the step_resume_breakpoin via the
2173 cleanup chain, so no need to worry about it here. */
2175 stop_stepping (ecs
);
2178 case BPSTAT_WHAT_STEP_RESUME
:
2179 /* This proably demands a more elegant solution, but, yeah
2182 This function's use of the simple variable
2183 step_resume_breakpoint doesn't seem to accomodate
2184 simultaneously active step-resume bp's, although the
2185 breakpoint list certainly can.
2187 If we reach here and step_resume_breakpoint is already
2188 NULL, then apparently we have multiple active
2189 step-resume bp's. We'll just delete the breakpoint we
2190 stopped at, and carry on.
2192 Correction: what the code currently does is delete a
2193 step-resume bp, but it makes no effort to ensure that
2194 the one deleted is the one currently stopped at. MVS */
2196 if (step_resume_breakpoint
== NULL
)
2198 step_resume_breakpoint
=
2199 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2201 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2204 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2205 /* If were waiting for a trap, hitting the step_resume_break
2206 doesn't count as getting it. */
2208 ecs
->another_trap
= 1;
2211 case BPSTAT_WHAT_CHECK_SHLIBS
:
2212 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2215 /* Remove breakpoints, we eventually want to step over the
2216 shlib event breakpoint, and SOLIB_ADD might adjust
2217 breakpoint addresses via breakpoint_re_set. */
2218 if (breakpoints_inserted
)
2219 remove_breakpoints ();
2220 breakpoints_inserted
= 0;
2222 /* Check for any newly added shared libraries if we're
2223 supposed to be adding them automatically. Switch
2224 terminal for any messages produced by
2225 breakpoint_re_set. */
2226 target_terminal_ours_for_output ();
2227 /* NOTE: cagney/2003-11-25: Make certain that the target
2228 stack's section table is kept up-to-date. Architectures,
2229 (e.g., PPC64), use the section table to perform
2230 operations such as address => section name and hence
2231 require the table to contain all sections (including
2232 those found in shared libraries). */
2233 /* NOTE: cagney/2003-11-25: Pass current_target and not
2234 exec_ops to SOLIB_ADD. This is because current GDB is
2235 only tooled to propagate section_table changes out from
2236 the "current_target" (see target_resize_to_sections), and
2237 not up from the exec stratum. This, of course, isn't
2238 right. "infrun.c" should only interact with the
2239 exec/process stratum, instead relying on the target stack
2240 to propagate relevant changes (stop, section table
2241 changed, ...) up to other layers. */
2242 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2243 target_terminal_inferior ();
2245 /* Try to reenable shared library breakpoints, additional
2246 code segments in shared libraries might be mapped in now. */
2247 re_enable_breakpoints_in_shlibs ();
2249 /* If requested, stop when the dynamic linker notifies
2250 gdb of events. This allows the user to get control
2251 and place breakpoints in initializer routines for
2252 dynamically loaded objects (among other things). */
2253 if (stop_on_solib_events
|| stop_stack_dummy
)
2255 stop_stepping (ecs
);
2259 /* If we stopped due to an explicit catchpoint, then the
2260 (see above) call to SOLIB_ADD pulled in any symbols
2261 from a newly-loaded library, if appropriate.
2263 We do want the inferior to stop, but not where it is
2264 now, which is in the dynamic linker callback. Rather,
2265 we would like it stop in the user's program, just after
2266 the call that caused this catchpoint to trigger. That
2267 gives the user a more useful vantage from which to
2268 examine their program's state. */
2269 else if (what
.main_action
==
2270 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2272 /* ??rehrauer: If I could figure out how to get the
2273 right return PC from here, we could just set a temp
2274 breakpoint and resume. I'm not sure we can without
2275 cracking open the dld's shared libraries and sniffing
2276 their unwind tables and text/data ranges, and that's
2277 not a terribly portable notion.
2279 Until that time, we must step the inferior out of the
2280 dld callback, and also out of the dld itself (and any
2281 code or stubs in libdld.sl, such as "shl_load" and
2282 friends) until we reach non-dld code. At that point,
2283 we can stop stepping. */
2284 bpstat_get_triggered_catchpoints (stop_bpstat
,
2286 stepping_through_solib_catchpoints
);
2287 ecs
->stepping_through_solib_after_catch
= 1;
2289 /* Be sure to lift all breakpoints, so the inferior does
2290 actually step past this point... */
2291 ecs
->another_trap
= 1;
2296 /* We want to step over this breakpoint, then keep going. */
2297 ecs
->another_trap
= 1;
2304 case BPSTAT_WHAT_LAST
:
2305 /* Not a real code, but listed here to shut up gcc -Wall. */
2307 case BPSTAT_WHAT_KEEP_CHECKING
:
2312 /* We come here if we hit a breakpoint but should not
2313 stop for it. Possibly we also were stepping
2314 and should stop for that. So fall through and
2315 test for stepping. But, if not stepping,
2318 /* Are we stepping to get the inferior out of the dynamic
2319 linker's hook (and possibly the dld itself) after catching
2321 if (ecs
->stepping_through_solib_after_catch
)
2323 #if defined(SOLIB_ADD)
2324 /* Have we reached our destination? If not, keep going. */
2325 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2327 ecs
->another_trap
= 1;
2332 /* Else, stop and report the catchpoint(s) whose triggering
2333 caused us to begin stepping. */
2334 ecs
->stepping_through_solib_after_catch
= 0;
2335 bpstat_clear (&stop_bpstat
);
2336 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2337 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2338 stop_print_frame
= 1;
2339 stop_stepping (ecs
);
2343 if (step_resume_breakpoint
)
2345 /* Having a step-resume breakpoint overrides anything
2346 else having to do with stepping commands until
2347 that breakpoint is reached. */
2352 if (step_range_end
== 0)
2354 /* Likewise if we aren't even stepping. */
2359 /* If stepping through a line, keep going if still within it.
2361 Note that step_range_end is the address of the first instruction
2362 beyond the step range, and NOT the address of the last instruction
2364 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2370 /* We stepped out of the stepping range. */
2372 /* If we are stepping at the source level and entered the runtime
2373 loader dynamic symbol resolution code, we keep on single stepping
2374 until we exit the run time loader code and reach the callee's
2376 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2377 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2379 CORE_ADDR pc_after_resolver
=
2380 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2382 if (pc_after_resolver
)
2384 /* Set up a step-resume breakpoint at the address
2385 indicated by SKIP_SOLIB_RESOLVER. */
2386 struct symtab_and_line sr_sal
;
2388 sr_sal
.pc
= pc_after_resolver
;
2390 check_for_old_step_resume_breakpoint ();
2391 step_resume_breakpoint
=
2392 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2393 if (breakpoints_inserted
)
2394 insert_breakpoints ();
2401 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2402 && ecs
->stop_func_name
== NULL
)
2404 /* There is no symbol, not even a minimal symbol, corresponding
2405 to the address where we just stopped. So we just stepped
2406 inside undebuggable code. Since we want to step over this
2407 kind of code, we keep going until the inferior returns from
2408 the current function. */
2409 handle_step_into_function (ecs
);
2413 /* We can't update step_sp every time through the loop, because
2414 reading the stack pointer would slow down stepping too much.
2415 But we can update it every time we leave the step range. */
2416 ecs
->update_step_sp
= 1;
2418 if (step_range_end
!= 1
2419 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2420 || step_over_calls
== STEP_OVER_ALL
)
2421 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2423 /* The inferior, while doing a "step" or "next", has ended up in
2424 a signal trampoline (either by a signal being delivered or by
2425 the signal handler returning). Just single-step until the
2426 inferior leaves the trampoline (either by calling the handler
2432 if (frame_id_eq (get_frame_id (get_prev_frame (get_current_frame ())),
2435 /* It's a subroutine call. */
2436 handle_step_into_function (ecs
);
2440 /* We've wandered out of the step range. */
2442 ecs
->sal
= find_pc_line (stop_pc
, 0);
2444 if (step_range_end
== 1)
2446 /* It is stepi or nexti. We always want to stop stepping after
2449 print_stop_reason (END_STEPPING_RANGE
, 0);
2450 stop_stepping (ecs
);
2454 /* If we're in the return path from a shared library trampoline,
2455 we want to proceed through the trampoline when stepping. */
2456 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2458 /* Determine where this trampoline returns. */
2459 CORE_ADDR real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2461 /* Only proceed through if we know where it's going. */
2464 /* And put the step-breakpoint there and go until there. */
2465 struct symtab_and_line sr_sal
;
2467 init_sal (&sr_sal
); /* initialize to zeroes */
2468 sr_sal
.pc
= real_stop_pc
;
2469 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2470 /* Do not specify what the fp should be when we stop
2471 since on some machines the prologue
2472 is where the new fp value is established. */
2473 check_for_old_step_resume_breakpoint ();
2474 step_resume_breakpoint
=
2475 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2476 if (breakpoints_inserted
)
2477 insert_breakpoints ();
2479 /* Restart without fiddling with the step ranges or
2486 if (ecs
->sal
.line
== 0)
2488 /* We have no line number information. That means to stop
2489 stepping (does this always happen right after one instruction,
2490 when we do "s" in a function with no line numbers,
2491 or can this happen as a result of a return or longjmp?). */
2493 print_stop_reason (END_STEPPING_RANGE
, 0);
2494 stop_stepping (ecs
);
2498 if ((stop_pc
== ecs
->sal
.pc
)
2499 && (ecs
->current_line
!= ecs
->sal
.line
2500 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2502 /* We are at the start of a different line. So stop. Note that
2503 we don't stop if we step into the middle of a different line.
2504 That is said to make things like for (;;) statements work
2507 print_stop_reason (END_STEPPING_RANGE
, 0);
2508 stop_stepping (ecs
);
2512 /* We aren't done stepping.
2514 Optimize by setting the stepping range to the line.
2515 (We might not be in the original line, but if we entered a
2516 new line in mid-statement, we continue stepping. This makes
2517 things like for(;;) statements work better.) */
2519 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2521 /* If this is the last line of the function, don't keep stepping
2522 (it would probably step us out of the function).
2523 This is particularly necessary for a one-line function,
2524 in which after skipping the prologue we better stop even though
2525 we will be in mid-line. */
2527 print_stop_reason (END_STEPPING_RANGE
, 0);
2528 stop_stepping (ecs
);
2531 step_range_start
= ecs
->sal
.pc
;
2532 step_range_end
= ecs
->sal
.end
;
2533 step_frame_id
= get_frame_id (get_current_frame ());
2534 ecs
->current_line
= ecs
->sal
.line
;
2535 ecs
->current_symtab
= ecs
->sal
.symtab
;
2537 /* In the case where we just stepped out of a function into the
2538 middle of a line of the caller, continue stepping, but
2539 step_frame_id must be modified to current frame */
2541 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2542 generous. It will trigger on things like a step into a frameless
2543 stackless leaf function. I think the logic should instead look
2544 at the unwound frame ID has that should give a more robust
2545 indication of what happened. */
2546 if (step
-ID
== current
-ID
)
2547 still stepping in same function
;
2548 else if (step
-ID
== unwind (current
-ID
))
2549 stepped into a function
;
2551 stepped out of a function
;
2552 /* Of course this assumes that the frame ID unwind code is robust
2553 and we're willing to introduce frame unwind logic into this
2554 function. Fortunately, those days are nearly upon us. */
2557 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2558 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2559 step_frame_id
= current_frame
;
2565 /* Are we in the middle of stepping? */
2568 currently_stepping (struct execution_control_state
*ecs
)
2570 return ((!ecs
->handling_longjmp
2571 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2573 || ecs
->stepping_through_solib_after_catch
2574 || bpstat_should_step ());
2577 /* Subroutine call with source code we should not step over. Do step
2578 to the first line of code in it. */
2581 step_into_function (struct execution_control_state
*ecs
)
2584 struct symtab_and_line sr_sal
;
2586 s
= find_pc_symtab (stop_pc
);
2587 if (s
&& s
->language
!= language_asm
)
2588 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2590 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2591 /* Use the step_resume_break to step until the end of the prologue,
2592 even if that involves jumps (as it seems to on the vax under
2594 /* If the prologue ends in the middle of a source line, continue to
2595 the end of that source line (if it is still within the function).
2596 Otherwise, just go to end of prologue. */
2598 && ecs
->sal
.pc
!= ecs
->stop_func_start
2599 && ecs
->sal
.end
< ecs
->stop_func_end
)
2600 ecs
->stop_func_start
= ecs
->sal
.end
;
2602 /* Architectures which require breakpoint adjustment might not be able
2603 to place a breakpoint at the computed address. If so, the test
2604 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2605 ecs->stop_func_start to an address at which a breakpoint may be
2606 legitimately placed.
2608 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2609 made, GDB will enter an infinite loop when stepping through
2610 optimized code consisting of VLIW instructions which contain
2611 subinstructions corresponding to different source lines. On
2612 FR-V, it's not permitted to place a breakpoint on any but the
2613 first subinstruction of a VLIW instruction. When a breakpoint is
2614 set, GDB will adjust the breakpoint address to the beginning of
2615 the VLIW instruction. Thus, we need to make the corresponding
2616 adjustment here when computing the stop address. */
2618 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2620 ecs
->stop_func_start
2621 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2622 ecs
->stop_func_start
);
2625 if (ecs
->stop_func_start
== stop_pc
)
2627 /* We are already there: stop now. */
2629 print_stop_reason (END_STEPPING_RANGE
, 0);
2630 stop_stepping (ecs
);
2635 /* Put the step-breakpoint there and go until there. */
2636 init_sal (&sr_sal
); /* initialize to zeroes */
2637 sr_sal
.pc
= ecs
->stop_func_start
;
2638 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2639 /* Do not specify what the fp should be when we stop since on
2640 some machines the prologue is where the new fp value is
2642 check_for_old_step_resume_breakpoint ();
2643 step_resume_breakpoint
=
2644 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2645 if (breakpoints_inserted
)
2646 insert_breakpoints ();
2648 /* And make sure stepping stops right away then. */
2649 step_range_end
= step_range_start
;
2654 /* The inferior, as a result of a function call (has left) or signal
2655 (about to leave) the single-step range. Set a momentary breakpoint
2656 within the step range where the inferior is expected to later
2660 insert_step_resume_breakpoint (struct frame_info
*step_frame
,
2661 struct execution_control_state
*ecs
)
2663 struct symtab_and_line sr_sal
;
2665 /* This is only used within the step-resume range/frame. */
2666 gdb_assert (frame_id_eq (step_frame_id
, get_frame_id (step_frame
)));
2667 gdb_assert (step_range_end
!= 0);
2668 /* Remember, if the call instruction is the last in the step range,
2669 the breakpoint will land just beyond that. Hence ``<=
2670 step_range_end''. Also, ignore check when "nexti". */
2671 gdb_assert (step_range_start
== step_range_end
2672 || (get_frame_pc (step_frame
) >= step_range_start
2673 && get_frame_pc (step_frame
) <= step_range_end
));
2675 init_sal (&sr_sal
); /* initialize to zeros */
2677 sr_sal
.pc
= ADDR_BITS_REMOVE (get_frame_pc (step_frame
));
2678 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2680 check_for_old_step_resume_breakpoint ();
2682 step_resume_breakpoint
2683 = set_momentary_breakpoint (sr_sal
, get_frame_id (step_frame
),
2686 if (breakpoints_inserted
)
2687 insert_breakpoints ();
2691 stop_stepping (struct execution_control_state
*ecs
)
2693 /* Let callers know we don't want to wait for the inferior anymore. */
2694 ecs
->wait_some_more
= 0;
2697 /* This function handles various cases where we need to continue
2698 waiting for the inferior. */
2699 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2702 keep_going (struct execution_control_state
*ecs
)
2704 /* Save the pc before execution, to compare with pc after stop. */
2705 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2707 if (ecs
->update_step_sp
)
2708 step_sp
= read_sp ();
2709 ecs
->update_step_sp
= 0;
2711 /* If we did not do break;, it means we should keep running the
2712 inferior and not return to debugger. */
2714 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2716 /* We took a signal (which we are supposed to pass through to
2717 the inferior, else we'd have done a break above) and we
2718 haven't yet gotten our trap. Simply continue. */
2719 resume (currently_stepping (ecs
), stop_signal
);
2723 /* Either the trap was not expected, but we are continuing
2724 anyway (the user asked that this signal be passed to the
2727 The signal was SIGTRAP, e.g. it was our signal, but we
2728 decided we should resume from it.
2730 We're going to run this baby now!
2732 Insert breakpoints now, unless we are trying to one-proceed
2733 past a breakpoint. */
2734 /* If we've just finished a special step resume and we don't
2735 want to hit a breakpoint, pull em out. */
2736 if (step_resume_breakpoint
== NULL
2737 && ecs
->remove_breakpoints_on_following_step
)
2739 ecs
->remove_breakpoints_on_following_step
= 0;
2740 remove_breakpoints ();
2741 breakpoints_inserted
= 0;
2743 else if (!breakpoints_inserted
&& !ecs
->another_trap
)
2745 breakpoints_failed
= insert_breakpoints ();
2746 if (breakpoints_failed
)
2748 stop_stepping (ecs
);
2751 breakpoints_inserted
= 1;
2754 trap_expected
= ecs
->another_trap
;
2756 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2757 specifies that such a signal should be delivered to the
2760 Typically, this would occure when a user is debugging a
2761 target monitor on a simulator: the target monitor sets a
2762 breakpoint; the simulator encounters this break-point and
2763 halts the simulation handing control to GDB; GDB, noteing
2764 that the break-point isn't valid, returns control back to the
2765 simulator; the simulator then delivers the hardware
2766 equivalent of a SIGNAL_TRAP to the program being debugged. */
2768 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2769 stop_signal
= TARGET_SIGNAL_0
;
2772 resume (currently_stepping (ecs
), stop_signal
);
2775 prepare_to_wait (ecs
);
2778 /* This function normally comes after a resume, before
2779 handle_inferior_event exits. It takes care of any last bits of
2780 housekeeping, and sets the all-important wait_some_more flag. */
2783 prepare_to_wait (struct execution_control_state
*ecs
)
2785 if (ecs
->infwait_state
== infwait_normal_state
)
2787 overlay_cache_invalid
= 1;
2789 /* We have to invalidate the registers BEFORE calling
2790 target_wait because they can be loaded from the target while
2791 in target_wait. This makes remote debugging a bit more
2792 efficient for those targets that provide critical registers
2793 as part of their normal status mechanism. */
2795 registers_changed ();
2796 ecs
->waiton_ptid
= pid_to_ptid (-1);
2797 ecs
->wp
= &(ecs
->ws
);
2799 /* This is the old end of the while loop. Let everybody know we
2800 want to wait for the inferior some more and get called again
2802 ecs
->wait_some_more
= 1;
2805 /* Print why the inferior has stopped. We always print something when
2806 the inferior exits, or receives a signal. The rest of the cases are
2807 dealt with later on in normal_stop() and print_it_typical(). Ideally
2808 there should be a call to this function from handle_inferior_event()
2809 each time stop_stepping() is called.*/
2811 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2813 switch (stop_reason
)
2816 /* We don't deal with these cases from handle_inferior_event()
2819 case END_STEPPING_RANGE
:
2820 /* We are done with a step/next/si/ni command. */
2821 /* For now print nothing. */
2822 /* Print a message only if not in the middle of doing a "step n"
2823 operation for n > 1 */
2824 if (!step_multi
|| !stop_step
)
2825 if (ui_out_is_mi_like_p (uiout
))
2826 ui_out_field_string (uiout
, "reason", "end-stepping-range");
2828 case BREAKPOINT_HIT
:
2829 /* We found a breakpoint. */
2830 /* For now print nothing. */
2833 /* The inferior was terminated by a signal. */
2834 annotate_signalled ();
2835 if (ui_out_is_mi_like_p (uiout
))
2836 ui_out_field_string (uiout
, "reason", "exited-signalled");
2837 ui_out_text (uiout
, "\nProgram terminated with signal ");
2838 annotate_signal_name ();
2839 ui_out_field_string (uiout
, "signal-name",
2840 target_signal_to_name (stop_info
));
2841 annotate_signal_name_end ();
2842 ui_out_text (uiout
, ", ");
2843 annotate_signal_string ();
2844 ui_out_field_string (uiout
, "signal-meaning",
2845 target_signal_to_string (stop_info
));
2846 annotate_signal_string_end ();
2847 ui_out_text (uiout
, ".\n");
2848 ui_out_text (uiout
, "The program no longer exists.\n");
2851 /* The inferior program is finished. */
2852 annotate_exited (stop_info
);
2855 if (ui_out_is_mi_like_p (uiout
))
2856 ui_out_field_string (uiout
, "reason", "exited");
2857 ui_out_text (uiout
, "\nProgram exited with code ");
2858 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2859 (unsigned int) stop_info
);
2860 ui_out_text (uiout
, ".\n");
2864 if (ui_out_is_mi_like_p (uiout
))
2865 ui_out_field_string (uiout
, "reason", "exited-normally");
2866 ui_out_text (uiout
, "\nProgram exited normally.\n");
2869 case SIGNAL_RECEIVED
:
2870 /* Signal received. The signal table tells us to print about
2873 ui_out_text (uiout
, "\nProgram received signal ");
2874 annotate_signal_name ();
2875 if (ui_out_is_mi_like_p (uiout
))
2876 ui_out_field_string (uiout
, "reason", "signal-received");
2877 ui_out_field_string (uiout
, "signal-name",
2878 target_signal_to_name (stop_info
));
2879 annotate_signal_name_end ();
2880 ui_out_text (uiout
, ", ");
2881 annotate_signal_string ();
2882 ui_out_field_string (uiout
, "signal-meaning",
2883 target_signal_to_string (stop_info
));
2884 annotate_signal_string_end ();
2885 ui_out_text (uiout
, ".\n");
2888 internal_error (__FILE__
, __LINE__
,
2889 "print_stop_reason: unrecognized enum value");
2895 /* Here to return control to GDB when the inferior stops for real.
2896 Print appropriate messages, remove breakpoints, give terminal our modes.
2898 STOP_PRINT_FRAME nonzero means print the executing frame
2899 (pc, function, args, file, line number and line text).
2900 BREAKPOINTS_FAILED nonzero means stop was due to error
2901 attempting to insert breakpoints. */
2906 struct target_waitstatus last
;
2909 get_last_target_status (&last_ptid
, &last
);
2911 /* As with the notification of thread events, we want to delay
2912 notifying the user that we've switched thread context until
2913 the inferior actually stops.
2915 There's no point in saying anything if the inferior has exited.
2916 Note that SIGNALLED here means "exited with a signal", not
2917 "received a signal". */
2918 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
2919 && target_has_execution
2920 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
2921 && last
.kind
!= TARGET_WAITKIND_EXITED
)
2923 target_terminal_ours_for_output ();
2924 printf_filtered ("[Switching to %s]\n",
2925 target_pid_or_tid_to_str (inferior_ptid
));
2926 previous_inferior_ptid
= inferior_ptid
;
2929 /* NOTE drow/2004-01-17: Is this still necessary? */
2930 /* Make sure that the current_frame's pc is correct. This
2931 is a correction for setting up the frame info before doing
2932 DECR_PC_AFTER_BREAK */
2933 if (target_has_execution
)
2934 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2935 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2936 frame code to check for this and sort out any resultant mess.
2937 DECR_PC_AFTER_BREAK needs to just go away. */
2938 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2940 if (target_has_execution
&& breakpoints_inserted
)
2942 if (remove_breakpoints ())
2944 target_terminal_ours_for_output ();
2945 printf_filtered ("Cannot remove breakpoints because ");
2946 printf_filtered ("program is no longer writable.\n");
2947 printf_filtered ("It might be running in another process.\n");
2948 printf_filtered ("Further execution is probably impossible.\n");
2951 breakpoints_inserted
= 0;
2953 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2954 Delete any breakpoint that is to be deleted at the next stop. */
2956 breakpoint_auto_delete (stop_bpstat
);
2958 /* If an auto-display called a function and that got a signal,
2959 delete that auto-display to avoid an infinite recursion. */
2961 if (stopped_by_random_signal
)
2962 disable_current_display ();
2964 /* Don't print a message if in the middle of doing a "step n"
2965 operation for n > 1 */
2966 if (step_multi
&& stop_step
)
2969 target_terminal_ours ();
2971 /* Look up the hook_stop and run it (CLI internally handles problem
2972 of stop_command's pre-hook not existing). */
2974 catch_errors (hook_stop_stub
, stop_command
,
2975 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
2977 if (!target_has_stack
)
2983 /* Select innermost stack frame - i.e., current frame is frame 0,
2984 and current location is based on that.
2985 Don't do this on return from a stack dummy routine,
2986 or if the program has exited. */
2988 if (!stop_stack_dummy
)
2990 select_frame (get_current_frame ());
2992 /* Print current location without a level number, if
2993 we have changed functions or hit a breakpoint.
2994 Print source line if we have one.
2995 bpstat_print() contains the logic deciding in detail
2996 what to print, based on the event(s) that just occurred. */
2998 if (stop_print_frame
&& deprecated_selected_frame
)
3002 int do_frame_printing
= 1;
3004 bpstat_ret
= bpstat_print (stop_bpstat
);
3008 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3009 (or should) carry around the function and does (or
3010 should) use that when doing a frame comparison. */
3012 && frame_id_eq (step_frame_id
,
3013 get_frame_id (get_current_frame ()))
3014 && step_start_function
== find_pc_function (stop_pc
))
3015 source_flag
= SRC_LINE
; /* finished step, just print source line */
3017 source_flag
= SRC_AND_LOC
; /* print location and source line */
3019 case PRINT_SRC_AND_LOC
:
3020 source_flag
= SRC_AND_LOC
; /* print location and source line */
3022 case PRINT_SRC_ONLY
:
3023 source_flag
= SRC_LINE
;
3026 source_flag
= SRC_LINE
; /* something bogus */
3027 do_frame_printing
= 0;
3030 internal_error (__FILE__
, __LINE__
, "Unknown value.");
3032 /* For mi, have the same behavior every time we stop:
3033 print everything but the source line. */
3034 if (ui_out_is_mi_like_p (uiout
))
3035 source_flag
= LOC_AND_ADDRESS
;
3037 if (ui_out_is_mi_like_p (uiout
))
3038 ui_out_field_int (uiout
, "thread-id",
3039 pid_to_thread_id (inferior_ptid
));
3040 /* The behavior of this routine with respect to the source
3042 SRC_LINE: Print only source line
3043 LOCATION: Print only location
3044 SRC_AND_LOC: Print location and source line */
3045 if (do_frame_printing
)
3046 print_stack_frame (get_selected_frame (), 0, source_flag
);
3048 /* Display the auto-display expressions. */
3053 /* Save the function value return registers, if we care.
3054 We might be about to restore their previous contents. */
3055 if (proceed_to_finish
)
3056 /* NB: The copy goes through to the target picking up the value of
3057 all the registers. */
3058 regcache_cpy (stop_registers
, current_regcache
);
3060 if (stop_stack_dummy
)
3062 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3063 ends with a setting of the current frame, so we can use that
3065 frame_pop (get_current_frame ());
3066 /* Set stop_pc to what it was before we called the function.
3067 Can't rely on restore_inferior_status because that only gets
3068 called if we don't stop in the called function. */
3069 stop_pc
= read_pc ();
3070 select_frame (get_current_frame ());
3074 annotate_stopped ();
3075 observer_notify_normal_stop (stop_bpstat
);
3079 hook_stop_stub (void *cmd
)
3081 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3086 signal_stop_state (int signo
)
3088 return signal_stop
[signo
];
3092 signal_print_state (int signo
)
3094 return signal_print
[signo
];
3098 signal_pass_state (int signo
)
3100 return signal_program
[signo
];
3104 signal_stop_update (int signo
, int state
)
3106 int ret
= signal_stop
[signo
];
3107 signal_stop
[signo
] = state
;
3112 signal_print_update (int signo
, int state
)
3114 int ret
= signal_print
[signo
];
3115 signal_print
[signo
] = state
;
3120 signal_pass_update (int signo
, int state
)
3122 int ret
= signal_program
[signo
];
3123 signal_program
[signo
] = state
;
3128 sig_print_header (void)
3131 Signal Stop\tPrint\tPass to program\tDescription\n");
3135 sig_print_info (enum target_signal oursig
)
3137 char *name
= target_signal_to_name (oursig
);
3138 int name_padding
= 13 - strlen (name
);
3140 if (name_padding
<= 0)
3143 printf_filtered ("%s", name
);
3144 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3145 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3146 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3147 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3148 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3151 /* Specify how various signals in the inferior should be handled. */
3154 handle_command (char *args
, int from_tty
)
3157 int digits
, wordlen
;
3158 int sigfirst
, signum
, siglast
;
3159 enum target_signal oursig
;
3162 unsigned char *sigs
;
3163 struct cleanup
*old_chain
;
3167 error_no_arg ("signal to handle");
3170 /* Allocate and zero an array of flags for which signals to handle. */
3172 nsigs
= (int) TARGET_SIGNAL_LAST
;
3173 sigs
= (unsigned char *) alloca (nsigs
);
3174 memset (sigs
, 0, nsigs
);
3176 /* Break the command line up into args. */
3178 argv
= buildargv (args
);
3183 old_chain
= make_cleanup_freeargv (argv
);
3185 /* Walk through the args, looking for signal oursigs, signal names, and
3186 actions. Signal numbers and signal names may be interspersed with
3187 actions, with the actions being performed for all signals cumulatively
3188 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3190 while (*argv
!= NULL
)
3192 wordlen
= strlen (*argv
);
3193 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3197 sigfirst
= siglast
= -1;
3199 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3201 /* Apply action to all signals except those used by the
3202 debugger. Silently skip those. */
3205 siglast
= nsigs
- 1;
3207 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3209 SET_SIGS (nsigs
, sigs
, signal_stop
);
3210 SET_SIGS (nsigs
, sigs
, signal_print
);
3212 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3214 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3216 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3218 SET_SIGS (nsigs
, sigs
, signal_print
);
3220 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3222 SET_SIGS (nsigs
, sigs
, signal_program
);
3224 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3226 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3228 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3230 SET_SIGS (nsigs
, sigs
, signal_program
);
3232 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3234 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3235 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3237 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3239 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3241 else if (digits
> 0)
3243 /* It is numeric. The numeric signal refers to our own
3244 internal signal numbering from target.h, not to host/target
3245 signal number. This is a feature; users really should be
3246 using symbolic names anyway, and the common ones like
3247 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3249 sigfirst
= siglast
= (int)
3250 target_signal_from_command (atoi (*argv
));
3251 if ((*argv
)[digits
] == '-')
3254 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3256 if (sigfirst
> siglast
)
3258 /* Bet he didn't figure we'd think of this case... */
3266 oursig
= target_signal_from_name (*argv
);
3267 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3269 sigfirst
= siglast
= (int) oursig
;
3273 /* Not a number and not a recognized flag word => complain. */
3274 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3278 /* If any signal numbers or symbol names were found, set flags for
3279 which signals to apply actions to. */
3281 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3283 switch ((enum target_signal
) signum
)
3285 case TARGET_SIGNAL_TRAP
:
3286 case TARGET_SIGNAL_INT
:
3287 if (!allsigs
&& !sigs
[signum
])
3289 if (query ("%s is used by the debugger.\n\
3290 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3296 printf_unfiltered ("Not confirmed, unchanged.\n");
3297 gdb_flush (gdb_stdout
);
3301 case TARGET_SIGNAL_0
:
3302 case TARGET_SIGNAL_DEFAULT
:
3303 case TARGET_SIGNAL_UNKNOWN
:
3304 /* Make sure that "all" doesn't print these. */
3315 target_notice_signals (inferior_ptid
);
3319 /* Show the results. */
3320 sig_print_header ();
3321 for (signum
= 0; signum
< nsigs
; signum
++)
3325 sig_print_info (signum
);
3330 do_cleanups (old_chain
);
3334 xdb_handle_command (char *args
, int from_tty
)
3337 struct cleanup
*old_chain
;
3339 /* Break the command line up into args. */
3341 argv
= buildargv (args
);
3346 old_chain
= make_cleanup_freeargv (argv
);
3347 if (argv
[1] != (char *) NULL
)
3352 bufLen
= strlen (argv
[0]) + 20;
3353 argBuf
= (char *) xmalloc (bufLen
);
3357 enum target_signal oursig
;
3359 oursig
= target_signal_from_name (argv
[0]);
3360 memset (argBuf
, 0, bufLen
);
3361 if (strcmp (argv
[1], "Q") == 0)
3362 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3365 if (strcmp (argv
[1], "s") == 0)
3367 if (!signal_stop
[oursig
])
3368 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3370 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3372 else if (strcmp (argv
[1], "i") == 0)
3374 if (!signal_program
[oursig
])
3375 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3377 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3379 else if (strcmp (argv
[1], "r") == 0)
3381 if (!signal_print
[oursig
])
3382 sprintf (argBuf
, "%s %s", argv
[0], "print");
3384 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3390 handle_command (argBuf
, from_tty
);
3392 printf_filtered ("Invalid signal handling flag.\n");
3397 do_cleanups (old_chain
);
3400 /* Print current contents of the tables set by the handle command.
3401 It is possible we should just be printing signals actually used
3402 by the current target (but for things to work right when switching
3403 targets, all signals should be in the signal tables). */
3406 signals_info (char *signum_exp
, int from_tty
)
3408 enum target_signal oursig
;
3409 sig_print_header ();
3413 /* First see if this is a symbol name. */
3414 oursig
= target_signal_from_name (signum_exp
);
3415 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3417 /* No, try numeric. */
3419 target_signal_from_command (parse_and_eval_long (signum_exp
));
3421 sig_print_info (oursig
);
3425 printf_filtered ("\n");
3426 /* These ugly casts brought to you by the native VAX compiler. */
3427 for (oursig
= TARGET_SIGNAL_FIRST
;
3428 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3429 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3433 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3434 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3435 sig_print_info (oursig
);
3438 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3441 struct inferior_status
3443 enum target_signal stop_signal
;
3447 int stop_stack_dummy
;
3448 int stopped_by_random_signal
;
3450 CORE_ADDR step_range_start
;
3451 CORE_ADDR step_range_end
;
3452 struct frame_id step_frame_id
;
3453 enum step_over_calls_kind step_over_calls
;
3454 CORE_ADDR step_resume_break_address
;
3455 int stop_after_trap
;
3457 struct regcache
*stop_registers
;
3459 /* These are here because if call_function_by_hand has written some
3460 registers and then decides to call error(), we better not have changed
3462 struct regcache
*registers
;
3464 /* A frame unique identifier. */
3465 struct frame_id selected_frame_id
;
3467 int breakpoint_proceeded
;
3468 int restore_stack_info
;
3469 int proceed_to_finish
;
3473 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3476 int size
= DEPRECATED_REGISTER_RAW_SIZE (regno
);
3477 void *buf
= alloca (size
);
3478 store_signed_integer (buf
, size
, val
);
3479 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3482 /* Save all of the information associated with the inferior<==>gdb
3483 connection. INF_STATUS is a pointer to a "struct inferior_status"
3484 (defined in inferior.h). */
3486 struct inferior_status
*
3487 save_inferior_status (int restore_stack_info
)
3489 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3491 inf_status
->stop_signal
= stop_signal
;
3492 inf_status
->stop_pc
= stop_pc
;
3493 inf_status
->stop_step
= stop_step
;
3494 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3495 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3496 inf_status
->trap_expected
= trap_expected
;
3497 inf_status
->step_range_start
= step_range_start
;
3498 inf_status
->step_range_end
= step_range_end
;
3499 inf_status
->step_frame_id
= step_frame_id
;
3500 inf_status
->step_over_calls
= step_over_calls
;
3501 inf_status
->stop_after_trap
= stop_after_trap
;
3502 inf_status
->stop_soon
= stop_soon
;
3503 /* Save original bpstat chain here; replace it with copy of chain.
3504 If caller's caller is walking the chain, they'll be happier if we
3505 hand them back the original chain when restore_inferior_status is
3507 inf_status
->stop_bpstat
= stop_bpstat
;
3508 stop_bpstat
= bpstat_copy (stop_bpstat
);
3509 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3510 inf_status
->restore_stack_info
= restore_stack_info
;
3511 inf_status
->proceed_to_finish
= proceed_to_finish
;
3513 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3515 inf_status
->registers
= regcache_dup (current_regcache
);
3517 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3522 restore_selected_frame (void *args
)
3524 struct frame_id
*fid
= (struct frame_id
*) args
;
3525 struct frame_info
*frame
;
3527 frame
= frame_find_by_id (*fid
);
3529 /* If inf_status->selected_frame_id is NULL, there was no previously
3533 warning ("Unable to restore previously selected frame.\n");
3537 select_frame (frame
);
3543 restore_inferior_status (struct inferior_status
*inf_status
)
3545 stop_signal
= inf_status
->stop_signal
;
3546 stop_pc
= inf_status
->stop_pc
;
3547 stop_step
= inf_status
->stop_step
;
3548 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3549 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3550 trap_expected
= inf_status
->trap_expected
;
3551 step_range_start
= inf_status
->step_range_start
;
3552 step_range_end
= inf_status
->step_range_end
;
3553 step_frame_id
= inf_status
->step_frame_id
;
3554 step_over_calls
= inf_status
->step_over_calls
;
3555 stop_after_trap
= inf_status
->stop_after_trap
;
3556 stop_soon
= inf_status
->stop_soon
;
3557 bpstat_clear (&stop_bpstat
);
3558 stop_bpstat
= inf_status
->stop_bpstat
;
3559 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3560 proceed_to_finish
= inf_status
->proceed_to_finish
;
3562 /* FIXME: Is the restore of stop_registers always needed. */
3563 regcache_xfree (stop_registers
);
3564 stop_registers
= inf_status
->stop_registers
;
3566 /* The inferior can be gone if the user types "print exit(0)"
3567 (and perhaps other times). */
3568 if (target_has_execution
)
3569 /* NB: The register write goes through to the target. */
3570 regcache_cpy (current_regcache
, inf_status
->registers
);
3571 regcache_xfree (inf_status
->registers
);
3573 /* FIXME: If we are being called after stopping in a function which
3574 is called from gdb, we should not be trying to restore the
3575 selected frame; it just prints a spurious error message (The
3576 message is useful, however, in detecting bugs in gdb (like if gdb
3577 clobbers the stack)). In fact, should we be restoring the
3578 inferior status at all in that case? . */
3580 if (target_has_stack
&& inf_status
->restore_stack_info
)
3582 /* The point of catch_errors is that if the stack is clobbered,
3583 walking the stack might encounter a garbage pointer and
3584 error() trying to dereference it. */
3586 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3587 "Unable to restore previously selected frame:\n",
3588 RETURN_MASK_ERROR
) == 0)
3589 /* Error in restoring the selected frame. Select the innermost
3591 select_frame (get_current_frame ());
3599 do_restore_inferior_status_cleanup (void *sts
)
3601 restore_inferior_status (sts
);
3605 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3607 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3611 discard_inferior_status (struct inferior_status
*inf_status
)
3613 /* See save_inferior_status for info on stop_bpstat. */
3614 bpstat_clear (&inf_status
->stop_bpstat
);
3615 regcache_xfree (inf_status
->registers
);
3616 regcache_xfree (inf_status
->stop_registers
);
3621 inferior_has_forked (int pid
, int *child_pid
)
3623 struct target_waitstatus last
;
3626 get_last_target_status (&last_ptid
, &last
);
3628 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3631 if (ptid_get_pid (last_ptid
) != pid
)
3634 *child_pid
= last
.value
.related_pid
;
3639 inferior_has_vforked (int pid
, int *child_pid
)
3641 struct target_waitstatus last
;
3644 get_last_target_status (&last_ptid
, &last
);
3646 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3649 if (ptid_get_pid (last_ptid
) != pid
)
3652 *child_pid
= last
.value
.related_pid
;
3657 inferior_has_execd (int pid
, char **execd_pathname
)
3659 struct target_waitstatus last
;
3662 get_last_target_status (&last_ptid
, &last
);
3664 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3667 if (ptid_get_pid (last_ptid
) != pid
)
3670 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3674 /* Oft used ptids */
3676 ptid_t minus_one_ptid
;
3678 /* Create a ptid given the necessary PID, LWP, and TID components. */
3681 ptid_build (int pid
, long lwp
, long tid
)
3691 /* Create a ptid from just a pid. */
3694 pid_to_ptid (int pid
)
3696 return ptid_build (pid
, 0, 0);
3699 /* Fetch the pid (process id) component from a ptid. */
3702 ptid_get_pid (ptid_t ptid
)
3707 /* Fetch the lwp (lightweight process) component from a ptid. */
3710 ptid_get_lwp (ptid_t ptid
)
3715 /* Fetch the tid (thread id) component from a ptid. */
3718 ptid_get_tid (ptid_t ptid
)
3723 /* ptid_equal() is used to test equality of two ptids. */
3726 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3728 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3729 && ptid1
.tid
== ptid2
.tid
);
3732 /* restore_inferior_ptid() will be used by the cleanup machinery
3733 to restore the inferior_ptid value saved in a call to
3734 save_inferior_ptid(). */
3737 restore_inferior_ptid (void *arg
)
3739 ptid_t
*saved_ptid_ptr
= arg
;
3740 inferior_ptid
= *saved_ptid_ptr
;
3744 /* Save the value of inferior_ptid so that it may be restored by a
3745 later call to do_cleanups(). Returns the struct cleanup pointer
3746 needed for later doing the cleanup. */
3749 save_inferior_ptid (void)
3751 ptid_t
*saved_ptid_ptr
;
3753 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3754 *saved_ptid_ptr
= inferior_ptid
;
3755 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3762 stop_registers
= regcache_xmalloc (current_gdbarch
);
3766 _initialize_infrun (void)
3770 struct cmd_list_element
*c
;
3772 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers
);
3773 deprecated_register_gdbarch_swap (NULL
, 0, build_infrun
);
3775 add_info ("signals", signals_info
,
3776 "What debugger does when program gets various signals.\n\
3777 Specify a signal as argument to print info on that signal only.");
3778 add_info_alias ("handle", "signals", 0);
3780 add_com ("handle", class_run
, handle_command
,
3781 concat ("Specify how to handle a signal.\n\
3782 Args are signals and actions to apply to those signals.\n\
3783 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3784 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3785 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3786 The special arg \"all\" is recognized to mean all signals except those\n\
3787 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3788 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3789 Stop means reenter debugger if this signal happens (implies print).\n\
3790 Print means print a message if this signal happens.\n\
3791 Pass means let program see this signal; otherwise program doesn't know.\n\
3792 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3793 Pass and Stop may be combined.", NULL
));
3796 add_com ("lz", class_info
, signals_info
,
3797 "What debugger does when program gets various signals.\n\
3798 Specify a signal as argument to print info on that signal only.");
3799 add_com ("z", class_run
, xdb_handle_command
,
3800 concat ("Specify how to handle a signal.\n\
3801 Args are signals and actions to apply to those signals.\n\
3802 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3803 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3804 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3805 The special arg \"all\" is recognized to mean all signals except those\n\
3806 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3807 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3808 nopass), \"Q\" (noprint)\n\
3809 Stop means reenter debugger if this signal happens (implies print).\n\
3810 Print means print a message if this signal happens.\n\
3811 Pass means let program see this signal; otherwise program doesn't know.\n\
3812 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3813 Pass and Stop may be combined.", NULL
));
3818 add_cmd ("stop", class_obscure
, not_just_help_class_command
, "There is no `stop' command, but you can set a hook on `stop'.\n\
3819 This allows you to set a list of commands to be run each time execution\n\
3820 of the program stops.", &cmdlist
);
3822 numsigs
= (int) TARGET_SIGNAL_LAST
;
3823 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3824 signal_print
= (unsigned char *)
3825 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3826 signal_program
= (unsigned char *)
3827 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3828 for (i
= 0; i
< numsigs
; i
++)
3831 signal_print
[i
] = 1;
3832 signal_program
[i
] = 1;
3835 /* Signals caused by debugger's own actions
3836 should not be given to the program afterwards. */
3837 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3838 signal_program
[TARGET_SIGNAL_INT
] = 0;
3840 /* Signals that are not errors should not normally enter the debugger. */
3841 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3842 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3843 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3844 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3845 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3846 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3847 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3848 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3849 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3850 signal_print
[TARGET_SIGNAL_IO
] = 0;
3851 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3852 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3853 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3854 signal_print
[TARGET_SIGNAL_URG
] = 0;
3855 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
3856 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
3858 /* These signals are used internally by user-level thread
3859 implementations. (See signal(5) on Solaris.) Like the above
3860 signals, a healthy program receives and handles them as part of
3861 its normal operation. */
3862 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
3863 signal_print
[TARGET_SIGNAL_LWP
] = 0;
3864 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
3865 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
3866 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
3867 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
3871 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
3872 (char *) &stop_on_solib_events
,
3873 "Set stopping for shared library events.\n\
3874 If nonzero, gdb will give control to the user when the dynamic linker\n\
3875 notifies gdb of shared library events. The most common event of interest\n\
3876 to the user would be loading/unloading of a new library.\n", &setlist
), &showlist
);
3879 c
= add_set_enum_cmd ("follow-fork-mode",
3881 follow_fork_mode_kind_names
, &follow_fork_mode_string
,
3882 "Set debugger response to a program call of fork \
3884 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3885 parent - the original process is debugged after a fork\n\
3886 child - the new process is debugged after a fork\n\
3887 The unfollowed process will continue to run.\n\
3888 By default, the debugger will follow the parent process.", &setlist
);
3889 add_show_from_set (c
, &showlist
);
3891 c
= add_set_enum_cmd ("scheduler-locking", class_run
, scheduler_enums
, /* array of string names */
3892 &scheduler_mode
, /* current mode */
3893 "Set mode for locking scheduler during execution.\n\
3894 off == no locking (threads may preempt at any time)\n\
3895 on == full locking (no thread except the current thread may run)\n\
3896 step == scheduler locked during every single-step operation.\n\
3897 In this mode, no other thread may run during a step command.\n\
3898 Other threads may run while stepping over a function call ('next').", &setlist
);
3900 set_cmd_sfunc (c
, set_schedlock_func
); /* traps on target vector */
3901 add_show_from_set (c
, &showlist
);
3903 c
= add_set_cmd ("step-mode", class_run
,
3904 var_boolean
, (char *) &step_stop_if_no_debug
,
3905 "Set mode of the step operation. When set, doing a step over a\n\
3906 function without debug line information will stop at the first\n\
3907 instruction of that function. Otherwise, the function is skipped and\n\
3908 the step command stops at a different source line.", &setlist
);
3909 add_show_from_set (c
, &showlist
);
3911 /* ptid initializations */
3912 null_ptid
= ptid_build (0, 0, 0);
3913 minus_one_ptid
= ptid_build (-1, 0, 0);
3914 inferior_ptid
= null_ptid
;
3915 target_last_wait_ptid
= minus_one_ptid
;