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 Free Software
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"
48 /* Prototypes for local functions */
50 static void signals_info (char *, int);
52 static void handle_command (char *, int);
54 static void sig_print_info (enum target_signal
);
56 static void sig_print_header (void);
58 static void resume_cleanups (void *);
60 static int hook_stop_stub (void *);
62 static void delete_breakpoint_current_contents (void *);
64 static void set_follow_fork_mode_command (char *arg
, int from_tty
,
65 struct cmd_list_element
*c
);
67 static int restore_selected_frame (void *);
69 static void build_infrun (void);
71 static int follow_fork (void);
73 static void set_schedlock_func (char *args
, int from_tty
,
74 struct cmd_list_element
*c
);
76 struct execution_control_state
;
78 static int currently_stepping (struct execution_control_state
*ecs
);
80 static void xdb_handle_command (char *args
, int from_tty
);
82 void _initialize_infrun (void);
84 int inferior_ignoring_startup_exec_events
= 0;
85 int inferior_ignoring_leading_exec_events
= 0;
87 /* When set, stop the 'step' command if we enter a function which has
88 no line number information. The normal behavior is that we step
89 over such function. */
90 int step_stop_if_no_debug
= 0;
92 /* In asynchronous mode, but simulating synchronous execution. */
94 int sync_execution
= 0;
96 /* wait_for_inferior and normal_stop use this to notify the user
97 when the inferior stopped in a different thread than it had been
100 static ptid_t previous_inferior_ptid
;
102 /* This is true for configurations that may follow through execl() and
103 similar functions. At present this is only true for HP-UX native. */
105 #ifndef MAY_FOLLOW_EXEC
106 #define MAY_FOLLOW_EXEC (0)
109 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
111 /* If the program uses ELF-style shared libraries, then calls to
112 functions in shared libraries go through stubs, which live in a
113 table called the PLT (Procedure Linkage Table). The first time the
114 function is called, the stub sends control to the dynamic linker,
115 which looks up the function's real address, patches the stub so
116 that future calls will go directly to the function, and then passes
117 control to the function.
119 If we are stepping at the source level, we don't want to see any of
120 this --- we just want to skip over the stub and the dynamic linker.
121 The simple approach is to single-step until control leaves the
124 However, on some systems (e.g., Red Hat's 5.2 distribution) the
125 dynamic linker calls functions in the shared C library, so you
126 can't tell from the PC alone whether the dynamic linker is still
127 running. In this case, we use a step-resume breakpoint to get us
128 past the dynamic linker, as if we were using "next" to step over a
131 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
132 linker code or not. Normally, this means we single-step. However,
133 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
134 address where we can place a step-resume breakpoint to get past the
135 linker's symbol resolution function.
137 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
138 pretty portable way, by comparing the PC against the address ranges
139 of the dynamic linker's sections.
141 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
142 it depends on internal details of the dynamic linker. It's usually
143 not too hard to figure out where to put a breakpoint, but it
144 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
145 sanity checking. If it can't figure things out, returning zero and
146 getting the (possibly confusing) stepping behavior is better than
147 signalling an error, which will obscure the change in the
150 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
151 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
154 #ifndef SKIP_SOLIB_RESOLVER
155 #define SKIP_SOLIB_RESOLVER(pc) 0
158 /* This function returns TRUE if pc is the address of an instruction
159 that lies within the dynamic linker (such as the event hook, or the
162 This function must be used only when a dynamic linker event has
163 been caught, and the inferior is being stepped out of the hook, or
164 undefined results are guaranteed. */
166 #ifndef SOLIB_IN_DYNAMIC_LINKER
167 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
170 /* On MIPS16, a function that returns a floating point value may call
171 a library helper function to copy the return value to a floating point
172 register. The IGNORE_HELPER_CALL macro returns non-zero if we
173 should ignore (i.e. step over) this function call. */
174 #ifndef IGNORE_HELPER_CALL
175 #define IGNORE_HELPER_CALL(pc) 0
178 /* On some systems, the PC may be left pointing at an instruction that won't
179 actually be executed. This is usually indicated by a bit in the PSW. If
180 we find ourselves in such a state, then we step the target beyond the
181 nullified instruction before returning control to the user so as to avoid
184 #ifndef INSTRUCTION_NULLIFIED
185 #define INSTRUCTION_NULLIFIED 0
188 /* We can't step off a permanent breakpoint in the ordinary way, because we
189 can't remove it. Instead, we have to advance the PC to the next
190 instruction. This macro should expand to a pointer to a function that
191 does that, or zero if we have no such function. If we don't have a
192 definition for it, we have to report an error. */
193 #ifndef SKIP_PERMANENT_BREAKPOINT
194 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
196 default_skip_permanent_breakpoint (void)
199 The program is stopped at a permanent breakpoint, but GDB does not know\n\
200 how to step past a permanent breakpoint on this architecture. Try using\n\
201 a command like `return' or `jump' to continue execution.");
206 /* Convert the #defines into values. This is temporary until wfi control
207 flow is completely sorted out. */
209 #ifndef HAVE_STEPPABLE_WATCHPOINT
210 #define HAVE_STEPPABLE_WATCHPOINT 0
212 #undef HAVE_STEPPABLE_WATCHPOINT
213 #define HAVE_STEPPABLE_WATCHPOINT 1
216 #ifndef CANNOT_STEP_HW_WATCHPOINTS
217 #define CANNOT_STEP_HW_WATCHPOINTS 0
219 #undef CANNOT_STEP_HW_WATCHPOINTS
220 #define CANNOT_STEP_HW_WATCHPOINTS 1
223 /* Tables of how to react to signals; the user sets them. */
225 static unsigned char *signal_stop
;
226 static unsigned char *signal_print
;
227 static unsigned char *signal_program
;
229 #define SET_SIGS(nsigs,sigs,flags) \
231 int signum = (nsigs); \
232 while (signum-- > 0) \
233 if ((sigs)[signum]) \
234 (flags)[signum] = 1; \
237 #define UNSET_SIGS(nsigs,sigs,flags) \
239 int signum = (nsigs); \
240 while (signum-- > 0) \
241 if ((sigs)[signum]) \
242 (flags)[signum] = 0; \
245 /* Value to pass to target_resume() to cause all threads to resume */
247 #define RESUME_ALL (pid_to_ptid (-1))
249 /* Command list pointer for the "stop" placeholder. */
251 static struct cmd_list_element
*stop_command
;
253 /* Nonzero if breakpoints are now inserted in the inferior. */
255 static int breakpoints_inserted
;
257 /* Function inferior was in as of last step command. */
259 static struct symbol
*step_start_function
;
261 /* Nonzero if we are expecting a trace trap and should proceed from it. */
263 static int trap_expected
;
266 /* Nonzero if we want to give control to the user when we're notified
267 of shared library events by the dynamic linker. */
268 static int stop_on_solib_events
;
272 /* Nonzero if the next time we try to continue the inferior, it will
273 step one instruction and generate a spurious trace trap.
274 This is used to compensate for a bug in HP-UX. */
276 static int trap_expected_after_continue
;
279 /* Nonzero means expecting a trace trap
280 and should stop the inferior and return silently when it happens. */
284 /* Nonzero means expecting a trap and caller will handle it themselves.
285 It is used after attach, due to attaching to a process;
286 when running in the shell before the child program has been exec'd;
287 and when running some kinds of remote stuff (FIXME?). */
289 int stop_soon_quietly
;
291 /* Nonzero if proceed is being used for a "finish" command or a similar
292 situation when stop_registers should be saved. */
294 int proceed_to_finish
;
296 /* Save register contents here when about to pop a stack dummy frame,
297 if-and-only-if proceed_to_finish is set.
298 Thus this contains the return value from the called function (assuming
299 values are returned in a register). */
301 struct regcache
*stop_registers
;
303 /* Nonzero if program stopped due to error trying to insert breakpoints. */
305 static int breakpoints_failed
;
307 /* Nonzero after stop if current stack frame should be printed. */
309 static int stop_print_frame
;
311 static struct breakpoint
*step_resume_breakpoint
= NULL
;
312 static struct breakpoint
*through_sigtramp_breakpoint
= NULL
;
314 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
315 interactions with an inferior that is running a kernel function
316 (aka, a system call or "syscall"). wait_for_inferior therefore
317 may have a need to know when the inferior is in a syscall. This
318 is a count of the number of inferior threads which are known to
319 currently be running in a syscall. */
320 static int number_of_threads_in_syscalls
;
322 /* This is a cached copy of the pid/waitstatus of the last event
323 returned by target_wait()/target_wait_hook(). This information is
324 returned by get_last_target_status(). */
325 static ptid_t target_last_wait_ptid
;
326 static struct target_waitstatus target_last_waitstatus
;
328 /* This is used to remember when a fork, vfork or exec event
329 was caught by a catchpoint, and thus the event is to be
330 followed at the next resume of the inferior, and not
334 enum target_waitkind kind
;
341 char *execd_pathname
;
345 static const char follow_fork_mode_ask
[] = "ask";
346 static const char follow_fork_mode_child
[] = "child";
347 static const char follow_fork_mode_parent
[] = "parent";
349 static const char *follow_fork_mode_kind_names
[] = {
350 follow_fork_mode_ask
,
351 follow_fork_mode_child
,
352 follow_fork_mode_parent
,
356 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
362 const char *follow_mode
= follow_fork_mode_string
;
363 int follow_child
= (follow_mode
== follow_fork_mode_child
);
365 /* Or, did the user not know, and want us to ask? */
366 if (follow_fork_mode_string
== follow_fork_mode_ask
)
368 internal_error (__FILE__
, __LINE__
,
369 "follow_inferior_fork: \"ask\" mode not implemented");
370 /* follow_mode = follow_fork_mode_...; */
373 return target_follow_fork (follow_child
);
377 follow_inferior_reset_breakpoints (void)
379 /* Was there a step_resume breakpoint? (There was if the user
380 did a "next" at the fork() call.) If so, explicitly reset its
383 step_resumes are a form of bp that are made to be per-thread.
384 Since we created the step_resume bp when the parent process
385 was being debugged, and now are switching to the child process,
386 from the breakpoint package's viewpoint, that's a switch of
387 "threads". We must update the bp's notion of which thread
388 it is for, or it'll be ignored when it triggers. */
390 if (step_resume_breakpoint
)
391 breakpoint_re_set_thread (step_resume_breakpoint
);
393 /* Reinsert all breakpoints in the child. The user may have set
394 breakpoints after catching the fork, in which case those
395 were never set in the child, but only in the parent. This makes
396 sure the inserted breakpoints match the breakpoint list. */
398 breakpoint_re_set ();
399 insert_breakpoints ();
402 /* EXECD_PATHNAME is assumed to be non-NULL. */
405 follow_exec (int pid
, char *execd_pathname
)
408 struct target_ops
*tgt
;
410 if (!may_follow_exec
)
413 /* This is an exec event that we actually wish to pay attention to.
414 Refresh our symbol table to the newly exec'd program, remove any
417 If there are breakpoints, they aren't really inserted now,
418 since the exec() transformed our inferior into a fresh set
421 We want to preserve symbolic breakpoints on the list, since
422 we have hopes that they can be reset after the new a.out's
423 symbol table is read.
425 However, any "raw" breakpoints must be removed from the list
426 (e.g., the solib bp's), since their address is probably invalid
429 And, we DON'T want to call delete_breakpoints() here, since
430 that may write the bp's "shadow contents" (the instruction
431 value that was overwritten witha TRAP instruction). Since
432 we now have a new a.out, those shadow contents aren't valid. */
433 update_breakpoints_after_exec ();
435 /* If there was one, it's gone now. We cannot truly step-to-next
436 statement through an exec(). */
437 step_resume_breakpoint
= NULL
;
438 step_range_start
= 0;
441 /* If there was one, it's gone now. */
442 through_sigtramp_breakpoint
= NULL
;
444 /* What is this a.out's name? */
445 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
447 /* We've followed the inferior through an exec. Therefore, the
448 inferior has essentially been killed & reborn. */
450 /* First collect the run target in effect. */
451 tgt
= find_run_target ();
452 /* If we can't find one, things are in a very strange state... */
454 error ("Could find run target to save before following exec");
456 gdb_flush (gdb_stdout
);
457 target_mourn_inferior ();
458 inferior_ptid
= pid_to_ptid (saved_pid
);
459 /* Because mourn_inferior resets inferior_ptid. */
462 /* That a.out is now the one to use. */
463 exec_file_attach (execd_pathname
, 0);
465 /* And also is where symbols can be found. */
466 symbol_file_add_main (execd_pathname
, 0);
468 /* Reset the shared library package. This ensures that we get
469 a shlib event when the child reaches "_start", at which point
470 the dld will have had a chance to initialize the child. */
471 #if defined(SOLIB_RESTART)
474 #ifdef SOLIB_CREATE_INFERIOR_HOOK
475 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
478 /* Reinsert all breakpoints. (Those which were symbolic have
479 been reset to the proper address in the new a.out, thanks
480 to symbol_file_command...) */
481 insert_breakpoints ();
483 /* The next resume of this inferior should bring it to the shlib
484 startup breakpoints. (If the user had also set bp's on
485 "main" from the old (parent) process, then they'll auto-
486 matically get reset there in the new process.) */
489 /* Non-zero if we just simulating a single-step. This is needed
490 because we cannot remove the breakpoints in the inferior process
491 until after the `wait' in `wait_for_inferior'. */
492 static int singlestep_breakpoints_inserted_p
= 0;
495 /* Things to clean up if we QUIT out of resume (). */
498 resume_cleanups (void *ignore
)
503 static const char schedlock_off
[] = "off";
504 static const char schedlock_on
[] = "on";
505 static const char schedlock_step
[] = "step";
506 static const char *scheduler_mode
= schedlock_off
;
507 static const char *scheduler_enums
[] = {
515 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
517 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
518 the set command passed as a parameter. The clone operation will
519 include (BUG?) any ``set'' command callback, if present.
520 Commands like ``info set'' call all the ``show'' command
521 callbacks. Unfortunatly, for ``show'' commands cloned from
522 ``set'', this includes callbacks belonging to ``set'' commands.
523 Making this worse, this only occures if add_show_from_set() is
524 called after add_cmd_sfunc() (BUG?). */
525 if (cmd_type (c
) == set_cmd
)
526 if (!target_can_lock_scheduler
)
528 scheduler_mode
= schedlock_off
;
529 error ("Target '%s' cannot support this command.", target_shortname
);
534 /* Resume the inferior, but allow a QUIT. This is useful if the user
535 wants to interrupt some lengthy single-stepping operation
536 (for child processes, the SIGINT goes to the inferior, and so
537 we get a SIGINT random_signal, but for remote debugging and perhaps
538 other targets, that's not true).
540 STEP nonzero if we should step (zero to continue instead).
541 SIG is the signal to give the inferior (zero for none). */
543 resume (int step
, enum target_signal sig
)
545 int should_resume
= 1;
546 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
549 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
552 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
553 over an instruction that causes a page fault without triggering
554 a hardware watchpoint. The kernel properly notices that it shouldn't
555 stop, because the hardware watchpoint is not triggered, but it forgets
556 the step request and continues the program normally.
557 Work around the problem by removing hardware watchpoints if a step is
558 requested, GDB will check for a hardware watchpoint trigger after the
560 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
561 remove_hw_watchpoints ();
564 /* Normally, by the time we reach `resume', the breakpoints are either
565 removed or inserted, as appropriate. The exception is if we're sitting
566 at a permanent breakpoint; we need to step over it, but permanent
567 breakpoints can't be removed. So we have to test for it here. */
568 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
569 SKIP_PERMANENT_BREAKPOINT ();
571 if (SOFTWARE_SINGLE_STEP_P () && step
)
573 /* Do it the hard way, w/temp breakpoints */
574 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
575 /* ...and don't ask hardware to do it. */
577 /* and do not pull these breakpoints until after a `wait' in
578 `wait_for_inferior' */
579 singlestep_breakpoints_inserted_p
= 1;
582 /* Handle any optimized stores to the inferior NOW... */
583 #ifdef DO_DEFERRED_STORES
587 /* If there were any forks/vforks/execs that were caught and are
588 now to be followed, then do so. */
589 switch (pending_follow
.kind
)
591 case TARGET_WAITKIND_FORKED
:
592 case TARGET_WAITKIND_VFORKED
:
593 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
598 case TARGET_WAITKIND_EXECD
:
599 /* follow_exec is called as soon as the exec event is seen. */
600 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
607 /* Install inferior's terminal modes. */
608 target_terminal_inferior ();
614 resume_ptid
= RESUME_ALL
; /* Default */
616 if ((step
|| singlestep_breakpoints_inserted_p
) &&
617 !breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
619 /* Stepping past a breakpoint without inserting breakpoints.
620 Make sure only the current thread gets to step, so that
621 other threads don't sneak past breakpoints while they are
624 resume_ptid
= inferior_ptid
;
627 if ((scheduler_mode
== schedlock_on
) ||
628 (scheduler_mode
== schedlock_step
&&
629 (step
|| singlestep_breakpoints_inserted_p
)))
631 /* User-settable 'scheduler' mode requires solo thread resume. */
632 resume_ptid
= inferior_ptid
;
635 if (CANNOT_STEP_BREAKPOINT
)
637 /* Most targets can step a breakpoint instruction, thus
638 executing it normally. But if this one cannot, just
639 continue and we will hit it anyway. */
640 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
643 target_resume (resume_ptid
, step
, sig
);
646 discard_cleanups (old_cleanups
);
650 /* Clear out all variables saying what to do when inferior is continued.
651 First do this, then set the ones you want, then call `proceed'. */
654 clear_proceed_status (void)
657 step_range_start
= 0;
659 step_frame_id
= null_frame_id
;
660 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
662 stop_soon_quietly
= 0;
663 proceed_to_finish
= 0;
664 breakpoint_proceeded
= 1; /* We're about to proceed... */
666 /* Discard any remaining commands or status from previous stop. */
667 bpstat_clear (&stop_bpstat
);
670 /* Basic routine for continuing the program in various fashions.
672 ADDR is the address to resume at, or -1 for resume where stopped.
673 SIGGNAL is the signal to give it, or 0 for none,
674 or -1 for act according to how it stopped.
675 STEP is nonzero if should trap after one instruction.
676 -1 means return after that and print nothing.
677 You should probably set various step_... variables
678 before calling here, if you are stepping.
680 You should call clear_proceed_status before calling proceed. */
683 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
688 step_start_function
= find_pc_function (read_pc ());
692 if (addr
== (CORE_ADDR
) -1)
694 /* If there is a breakpoint at the address we will resume at,
695 step one instruction before inserting breakpoints
696 so that we do not stop right away (and report a second
697 hit at this breakpoint). */
699 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
702 #ifndef STEP_SKIPS_DELAY
703 #define STEP_SKIPS_DELAY(pc) (0)
704 #define STEP_SKIPS_DELAY_P (0)
706 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
707 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
708 is slow (it needs to read memory from the target). */
709 if (STEP_SKIPS_DELAY_P
710 && breakpoint_here_p (read_pc () + 4)
711 && STEP_SKIPS_DELAY (read_pc ()))
719 #ifdef PREPARE_TO_PROCEED
720 /* In a multi-threaded task we may select another thread
721 and then continue or step.
723 But if the old thread was stopped at a breakpoint, it
724 will immediately cause another breakpoint stop without
725 any execution (i.e. it will report a breakpoint hit
726 incorrectly). So we must step over it first.
728 PREPARE_TO_PROCEED checks the current thread against the thread
729 that reported the most recent event. If a step-over is required
730 it returns TRUE and sets the current thread to the old thread. */
731 if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
736 #endif /* PREPARE_TO_PROCEED */
739 if (trap_expected_after_continue
)
741 /* If (step == 0), a trap will be automatically generated after
742 the first instruction is executed. Force step one
743 instruction to clear this condition. This should not occur
744 if step is nonzero, but it is harmless in that case. */
746 trap_expected_after_continue
= 0;
748 #endif /* HP_OS_BUG */
751 /* We will get a trace trap after one instruction.
752 Continue it automatically and insert breakpoints then. */
756 insert_breakpoints ();
757 /* If we get here there was no call to error() in
758 insert breakpoints -- so they were inserted. */
759 breakpoints_inserted
= 1;
762 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
763 stop_signal
= siggnal
;
764 /* If this signal should not be seen by program,
765 give it zero. Used for debugging signals. */
766 else if (!signal_program
[stop_signal
])
767 stop_signal
= TARGET_SIGNAL_0
;
769 annotate_starting ();
771 /* Make sure that output from GDB appears before output from the
773 gdb_flush (gdb_stdout
);
775 /* Resume inferior. */
776 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
778 /* Wait for it to stop (if not standalone)
779 and in any case decode why it stopped, and act accordingly. */
780 /* Do this only if we are not using the event loop, or if the target
781 does not support asynchronous execution. */
782 if (!event_loop_p
|| !target_can_async_p ())
784 wait_for_inferior ();
789 /* Record the pc and sp of the program the last time it stopped.
790 These are just used internally by wait_for_inferior, but need
791 to be preserved over calls to it and cleared when the inferior
793 static CORE_ADDR prev_pc
;
794 static CORE_ADDR prev_func_start
;
795 static char *prev_func_name
;
798 /* Start remote-debugging of a machine over a serial link. */
804 init_wait_for_inferior ();
805 stop_soon_quietly
= 1;
808 /* Always go on waiting for the target, regardless of the mode. */
809 /* FIXME: cagney/1999-09-23: At present it isn't possible to
810 indicate to wait_for_inferior that a target should timeout if
811 nothing is returned (instead of just blocking). Because of this,
812 targets expecting an immediate response need to, internally, set
813 things up so that the target_wait() is forced to eventually
815 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
816 differentiate to its caller what the state of the target is after
817 the initial open has been performed. Here we're assuming that
818 the target has stopped. It should be possible to eventually have
819 target_open() return to the caller an indication that the target
820 is currently running and GDB state should be set to the same as
822 wait_for_inferior ();
826 /* Initialize static vars when a new inferior begins. */
829 init_wait_for_inferior (void)
831 /* These are meaningless until the first time through wait_for_inferior. */
834 prev_func_name
= NULL
;
837 trap_expected_after_continue
= 0;
839 breakpoints_inserted
= 0;
840 breakpoint_init_inferior (inf_starting
);
842 /* Don't confuse first call to proceed(). */
843 stop_signal
= TARGET_SIGNAL_0
;
845 /* The first resume is not following a fork/vfork/exec. */
846 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
848 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
849 number_of_threads_in_syscalls
= 0;
851 clear_proceed_status ();
855 delete_breakpoint_current_contents (void *arg
)
857 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
858 if (*breakpointp
!= NULL
)
860 delete_breakpoint (*breakpointp
);
865 /* This enum encodes possible reasons for doing a target_wait, so that
866 wfi can call target_wait in one place. (Ultimately the call will be
867 moved out of the infinite loop entirely.) */
871 infwait_normal_state
,
872 infwait_thread_hop_state
,
873 infwait_nullified_state
,
874 infwait_nonstep_watch_state
877 /* Why did the inferior stop? Used to print the appropriate messages
878 to the interface from within handle_inferior_event(). */
879 enum inferior_stop_reason
881 /* We don't know why. */
883 /* Step, next, nexti, stepi finished. */
885 /* Found breakpoint. */
887 /* Inferior terminated by signal. */
889 /* Inferior exited. */
891 /* Inferior received signal, and user asked to be notified. */
895 /* This structure contains what used to be local variables in
896 wait_for_inferior. Probably many of them can return to being
897 locals in handle_inferior_event. */
899 struct execution_control_state
901 struct target_waitstatus ws
;
902 struct target_waitstatus
*wp
;
905 CORE_ADDR stop_func_start
;
906 CORE_ADDR stop_func_end
;
907 char *stop_func_name
;
908 struct symtab_and_line sal
;
909 int remove_breakpoints_on_following_step
;
911 struct symtab
*current_symtab
;
912 int handling_longjmp
; /* FIXME */
914 ptid_t saved_inferior_ptid
;
916 int stepping_through_solib_after_catch
;
917 bpstat stepping_through_solib_catchpoints
;
918 int enable_hw_watchpoints_after_wait
;
919 int stepping_through_sigtramp
;
920 int new_thread_event
;
921 struct target_waitstatus tmpstatus
;
922 enum infwait_states infwait_state
;
927 void init_execution_control_state (struct execution_control_state
*ecs
);
929 void handle_inferior_event (struct execution_control_state
*ecs
);
931 static void check_sigtramp2 (struct execution_control_state
*ecs
);
932 static void step_into_function (struct execution_control_state
*ecs
);
933 static void step_over_function (struct execution_control_state
*ecs
);
934 static void stop_stepping (struct execution_control_state
*ecs
);
935 static void prepare_to_wait (struct execution_control_state
*ecs
);
936 static void keep_going (struct execution_control_state
*ecs
);
937 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
940 /* Wait for control to return from inferior to debugger.
941 If inferior gets a signal, we may decide to start it up again
942 instead of returning. That is why there is a loop in this function.
943 When this function actually returns it means the inferior
944 should be left stopped and GDB should read more commands. */
947 wait_for_inferior (void)
949 struct cleanup
*old_cleanups
;
950 struct execution_control_state ecss
;
951 struct execution_control_state
*ecs
;
953 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
954 &step_resume_breakpoint
);
955 make_cleanup (delete_breakpoint_current_contents
,
956 &through_sigtramp_breakpoint
);
958 /* wfi still stays in a loop, so it's OK just to take the address of
959 a local to get the ecs pointer. */
962 /* Fill in with reasonable starting values. */
963 init_execution_control_state (ecs
);
965 /* We'll update this if & when we switch to a new thread. */
966 previous_inferior_ptid
= inferior_ptid
;
968 overlay_cache_invalid
= 1;
970 /* We have to invalidate the registers BEFORE calling target_wait
971 because they can be loaded from the target while in target_wait.
972 This makes remote debugging a bit more efficient for those
973 targets that provide critical registers as part of their normal
976 registers_changed ();
980 if (target_wait_hook
)
981 ecs
->ptid
= target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
983 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
985 /* Now figure out what to do with the result of the result. */
986 handle_inferior_event (ecs
);
988 if (!ecs
->wait_some_more
)
991 do_cleanups (old_cleanups
);
994 /* Asynchronous version of wait_for_inferior. It is called by the
995 event loop whenever a change of state is detected on the file
996 descriptor corresponding to the target. It can be called more than
997 once to complete a single execution command. In such cases we need
998 to keep the state in a global variable ASYNC_ECSS. If it is the
999 last time that this function is called for a single execution
1000 command, then report to the user that the inferior has stopped, and
1001 do the necessary cleanups. */
1003 struct execution_control_state async_ecss
;
1004 struct execution_control_state
*async_ecs
;
1007 fetch_inferior_event (void *client_data
)
1009 static struct cleanup
*old_cleanups
;
1011 async_ecs
= &async_ecss
;
1013 if (!async_ecs
->wait_some_more
)
1015 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1016 &step_resume_breakpoint
);
1017 make_exec_cleanup (delete_breakpoint_current_contents
,
1018 &through_sigtramp_breakpoint
);
1020 /* Fill in with reasonable starting values. */
1021 init_execution_control_state (async_ecs
);
1023 /* We'll update this if & when we switch to a new thread. */
1024 previous_inferior_ptid
= inferior_ptid
;
1026 overlay_cache_invalid
= 1;
1028 /* We have to invalidate the registers BEFORE calling target_wait
1029 because they can be loaded from the target while in target_wait.
1030 This makes remote debugging a bit more efficient for those
1031 targets that provide critical registers as part of their normal
1032 status mechanism. */
1034 registers_changed ();
1037 if (target_wait_hook
)
1039 target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1041 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1043 /* Now figure out what to do with the result of the result. */
1044 handle_inferior_event (async_ecs
);
1046 if (!async_ecs
->wait_some_more
)
1048 /* Do only the cleanups that have been added by this
1049 function. Let the continuations for the commands do the rest,
1050 if there are any. */
1051 do_exec_cleanups (old_cleanups
);
1053 if (step_multi
&& stop_step
)
1054 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1056 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1060 /* Prepare an execution control state for looping through a
1061 wait_for_inferior-type loop. */
1064 init_execution_control_state (struct execution_control_state
*ecs
)
1066 /* ecs->another_trap? */
1067 ecs
->random_signal
= 0;
1068 ecs
->remove_breakpoints_on_following_step
= 0;
1069 ecs
->handling_longjmp
= 0; /* FIXME */
1070 ecs
->update_step_sp
= 0;
1071 ecs
->stepping_through_solib_after_catch
= 0;
1072 ecs
->stepping_through_solib_catchpoints
= NULL
;
1073 ecs
->enable_hw_watchpoints_after_wait
= 0;
1074 ecs
->stepping_through_sigtramp
= 0;
1075 ecs
->sal
= find_pc_line (prev_pc
, 0);
1076 ecs
->current_line
= ecs
->sal
.line
;
1077 ecs
->current_symtab
= ecs
->sal
.symtab
;
1078 ecs
->infwait_state
= infwait_normal_state
;
1079 ecs
->waiton_ptid
= pid_to_ptid (-1);
1080 ecs
->wp
= &(ecs
->ws
);
1083 /* Call this function before setting step_resume_breakpoint, as a
1084 sanity check. There should never be more than one step-resume
1085 breakpoint per thread, so we should never be setting a new
1086 step_resume_breakpoint when one is already active. */
1088 check_for_old_step_resume_breakpoint (void)
1090 if (step_resume_breakpoint
)
1092 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1095 /* Return the cached copy of the last pid/waitstatus returned by
1096 target_wait()/target_wait_hook(). The data is actually cached by
1097 handle_inferior_event(), which gets called immediately after
1098 target_wait()/target_wait_hook(). */
1101 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1103 *ptidp
= target_last_wait_ptid
;
1104 *status
= target_last_waitstatus
;
1107 /* Switch thread contexts, maintaining "infrun state". */
1110 context_switch (struct execution_control_state
*ecs
)
1112 /* Caution: it may happen that the new thread (or the old one!)
1113 is not in the thread list. In this case we must not attempt
1114 to "switch context", or we run the risk that our context may
1115 be lost. This may happen as a result of the target module
1116 mishandling thread creation. */
1118 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1119 { /* Perform infrun state context switch: */
1120 /* Save infrun state for the old thread. */
1121 save_infrun_state (inferior_ptid
, prev_pc
,
1122 prev_func_start
, prev_func_name
,
1123 trap_expected
, step_resume_breakpoint
,
1124 through_sigtramp_breakpoint
, step_range_start
,
1125 step_range_end
, &step_frame_id
,
1126 ecs
->handling_longjmp
, ecs
->another_trap
,
1127 ecs
->stepping_through_solib_after_catch
,
1128 ecs
->stepping_through_solib_catchpoints
,
1129 ecs
->stepping_through_sigtramp
,
1130 ecs
->current_line
, ecs
->current_symtab
, step_sp
);
1132 /* Load infrun state for the new thread. */
1133 load_infrun_state (ecs
->ptid
, &prev_pc
,
1134 &prev_func_start
, &prev_func_name
,
1135 &trap_expected
, &step_resume_breakpoint
,
1136 &through_sigtramp_breakpoint
, &step_range_start
,
1137 &step_range_end
, &step_frame_id
,
1138 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1139 &ecs
->stepping_through_solib_after_catch
,
1140 &ecs
->stepping_through_solib_catchpoints
,
1141 &ecs
->stepping_through_sigtramp
,
1142 &ecs
->current_line
, &ecs
->current_symtab
, &step_sp
);
1144 inferior_ptid
= ecs
->ptid
;
1148 /* Given an execution control state that has been freshly filled in
1149 by an event from the inferior, figure out what it means and take
1150 appropriate action. */
1153 handle_inferior_event (struct execution_control_state
*ecs
)
1155 CORE_ADDR real_stop_pc
;
1156 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1157 thinking that the variable stepped_after_stopped_by_watchpoint
1158 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1159 defined in the file "config/pa/nm-hppah.h", accesses the variable
1160 indirectly. Mutter something rude about the HP merge. */
1161 int stepped_after_stopped_by_watchpoint
;
1162 int sw_single_step_trap_p
= 0;
1164 /* Cache the last pid/waitstatus. */
1165 target_last_wait_ptid
= ecs
->ptid
;
1166 target_last_waitstatus
= *ecs
->wp
;
1168 switch (ecs
->infwait_state
)
1170 case infwait_thread_hop_state
:
1171 /* Cancel the waiton_ptid. */
1172 ecs
->waiton_ptid
= pid_to_ptid (-1);
1173 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1174 is serviced in this loop, below. */
1175 if (ecs
->enable_hw_watchpoints_after_wait
)
1177 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1178 ecs
->enable_hw_watchpoints_after_wait
= 0;
1180 stepped_after_stopped_by_watchpoint
= 0;
1183 case infwait_normal_state
:
1184 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1185 is serviced in this loop, below. */
1186 if (ecs
->enable_hw_watchpoints_after_wait
)
1188 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1189 ecs
->enable_hw_watchpoints_after_wait
= 0;
1191 stepped_after_stopped_by_watchpoint
= 0;
1194 case infwait_nullified_state
:
1195 stepped_after_stopped_by_watchpoint
= 0;
1198 case infwait_nonstep_watch_state
:
1199 insert_breakpoints ();
1201 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1202 handle things like signals arriving and other things happening
1203 in combination correctly? */
1204 stepped_after_stopped_by_watchpoint
= 1;
1208 internal_error (__FILE__
, __LINE__
, "bad switch");
1210 ecs
->infwait_state
= infwait_normal_state
;
1212 flush_cached_frames ();
1214 /* If it's a new process, add it to the thread database */
1216 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1217 && !in_thread_list (ecs
->ptid
));
1219 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1220 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1222 add_thread (ecs
->ptid
);
1224 ui_out_text (uiout
, "[New ");
1225 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1226 ui_out_text (uiout
, "]\n");
1229 /* NOTE: This block is ONLY meant to be invoked in case of a
1230 "thread creation event"! If it is invoked for any other
1231 sort of event (such as a new thread landing on a breakpoint),
1232 the event will be discarded, which is almost certainly
1235 To avoid this, the low-level module (eg. target_wait)
1236 should call in_thread_list and add_thread, so that the
1237 new thread is known by the time we get here. */
1239 /* We may want to consider not doing a resume here in order
1240 to give the user a chance to play with the new thread.
1241 It might be good to make that a user-settable option. */
1243 /* At this point, all threads are stopped (happens
1244 automatically in either the OS or the native code).
1245 Therefore we need to continue all threads in order to
1248 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1249 prepare_to_wait (ecs
);
1254 switch (ecs
->ws
.kind
)
1256 case TARGET_WAITKIND_LOADED
:
1257 /* Ignore gracefully during startup of the inferior, as it
1258 might be the shell which has just loaded some objects,
1259 otherwise add the symbols for the newly loaded objects. */
1261 if (!stop_soon_quietly
)
1263 /* Remove breakpoints, SOLIB_ADD might adjust
1264 breakpoint addresses via breakpoint_re_set. */
1265 if (breakpoints_inserted
)
1266 remove_breakpoints ();
1268 /* Check for any newly added shared libraries if we're
1269 supposed to be adding them automatically. Switch
1270 terminal for any messages produced by
1271 breakpoint_re_set. */
1272 target_terminal_ours_for_output ();
1273 SOLIB_ADD (NULL
, 0, NULL
, auto_solib_add
);
1274 target_terminal_inferior ();
1276 /* Reinsert breakpoints and continue. */
1277 if (breakpoints_inserted
)
1278 insert_breakpoints ();
1281 resume (0, TARGET_SIGNAL_0
);
1282 prepare_to_wait (ecs
);
1285 case TARGET_WAITKIND_SPURIOUS
:
1286 resume (0, TARGET_SIGNAL_0
);
1287 prepare_to_wait (ecs
);
1290 case TARGET_WAITKIND_EXITED
:
1291 target_terminal_ours (); /* Must do this before mourn anyway */
1292 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1294 /* Record the exit code in the convenience variable $_exitcode, so
1295 that the user can inspect this again later. */
1296 set_internalvar (lookup_internalvar ("_exitcode"),
1297 value_from_longest (builtin_type_int
,
1298 (LONGEST
) ecs
->ws
.value
.integer
));
1299 gdb_flush (gdb_stdout
);
1300 target_mourn_inferior ();
1301 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1302 stop_print_frame
= 0;
1303 stop_stepping (ecs
);
1306 case TARGET_WAITKIND_SIGNALLED
:
1307 stop_print_frame
= 0;
1308 stop_signal
= ecs
->ws
.value
.sig
;
1309 target_terminal_ours (); /* Must do this before mourn anyway */
1311 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1312 reach here unless the inferior is dead. However, for years
1313 target_kill() was called here, which hints that fatal signals aren't
1314 really fatal on some systems. If that's true, then some changes
1316 target_mourn_inferior ();
1318 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1319 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1320 stop_stepping (ecs
);
1323 /* The following are the only cases in which we keep going;
1324 the above cases end in a continue or goto. */
1325 case TARGET_WAITKIND_FORKED
:
1326 case TARGET_WAITKIND_VFORKED
:
1327 stop_signal
= TARGET_SIGNAL_TRAP
;
1328 pending_follow
.kind
= ecs
->ws
.kind
;
1330 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1331 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1333 stop_pc
= read_pc ();
1335 /* Assume that catchpoints are not really software breakpoints. If
1336 some future target implements them using software breakpoints then
1337 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1338 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1339 bpstat_stop_status will not decrement the PC. */
1341 stop_bpstat
= bpstat_stop_status (&stop_pc
, 1);
1343 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1345 /* If no catchpoint triggered for this, then keep going. */
1346 if (ecs
->random_signal
)
1348 stop_signal
= TARGET_SIGNAL_0
;
1352 goto process_event_stop_test
;
1354 case TARGET_WAITKIND_EXECD
:
1355 stop_signal
= TARGET_SIGNAL_TRAP
;
1357 /* NOTE drow/2002-12-05: This code should be pushed down into the
1358 target_wait function. Until then following vfork on HP/UX 10.20
1359 is probably broken by this. Of course, it's broken anyway. */
1360 /* Is this a target which reports multiple exec events per actual
1361 call to exec()? (HP-UX using ptrace does, for example.) If so,
1362 ignore all but the last one. Just resume the exec'r, and wait
1363 for the next exec event. */
1364 if (inferior_ignoring_leading_exec_events
)
1366 inferior_ignoring_leading_exec_events
--;
1367 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1368 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1370 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1371 prepare_to_wait (ecs
);
1374 inferior_ignoring_leading_exec_events
=
1375 target_reported_exec_events_per_exec_call () - 1;
1377 pending_follow
.execd_pathname
=
1378 savestring (ecs
->ws
.value
.execd_pathname
,
1379 strlen (ecs
->ws
.value
.execd_pathname
));
1381 /* This causes the eventpoints and symbol table to be reset. Must
1382 do this now, before trying to determine whether to stop. */
1383 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1384 xfree (pending_follow
.execd_pathname
);
1386 stop_pc
= read_pc_pid (ecs
->ptid
);
1387 ecs
->saved_inferior_ptid
= inferior_ptid
;
1388 inferior_ptid
= ecs
->ptid
;
1390 /* Assume that catchpoints are not really software breakpoints. If
1391 some future target implements them using software breakpoints then
1392 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1393 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1394 bpstat_stop_status will not decrement the PC. */
1396 stop_bpstat
= bpstat_stop_status (&stop_pc
, 1);
1398 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1399 inferior_ptid
= ecs
->saved_inferior_ptid
;
1401 /* If no catchpoint triggered for this, then keep going. */
1402 if (ecs
->random_signal
)
1404 stop_signal
= TARGET_SIGNAL_0
;
1408 goto process_event_stop_test
;
1410 /* These syscall events are returned on HP-UX, as part of its
1411 implementation of page-protection-based "hardware" watchpoints.
1412 HP-UX has unfortunate interactions between page-protections and
1413 some system calls. Our solution is to disable hardware watches
1414 when a system call is entered, and reenable them when the syscall
1415 completes. The downside of this is that we may miss the precise
1416 point at which a watched piece of memory is modified. "Oh well."
1418 Note that we may have multiple threads running, which may each
1419 enter syscalls at roughly the same time. Since we don't have a
1420 good notion currently of whether a watched piece of memory is
1421 thread-private, we'd best not have any page-protections active
1422 when any thread is in a syscall. Thus, we only want to reenable
1423 hardware watches when no threads are in a syscall.
1425 Also, be careful not to try to gather much state about a thread
1426 that's in a syscall. It's frequently a losing proposition. */
1427 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1428 number_of_threads_in_syscalls
++;
1429 if (number_of_threads_in_syscalls
== 1)
1431 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1433 resume (0, TARGET_SIGNAL_0
);
1434 prepare_to_wait (ecs
);
1437 /* Before examining the threads further, step this thread to
1438 get it entirely out of the syscall. (We get notice of the
1439 event when the thread is just on the verge of exiting a
1440 syscall. Stepping one instruction seems to get it back
1443 Note that although the logical place to reenable h/w watches
1444 is here, we cannot. We cannot reenable them before stepping
1445 the thread (this causes the next wait on the thread to hang).
1447 Nor can we enable them after stepping until we've done a wait.
1448 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1449 here, which will be serviced immediately after the target
1451 case TARGET_WAITKIND_SYSCALL_RETURN
:
1452 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1454 if (number_of_threads_in_syscalls
> 0)
1456 number_of_threads_in_syscalls
--;
1457 ecs
->enable_hw_watchpoints_after_wait
=
1458 (number_of_threads_in_syscalls
== 0);
1460 prepare_to_wait (ecs
);
1463 case TARGET_WAITKIND_STOPPED
:
1464 stop_signal
= ecs
->ws
.value
.sig
;
1467 /* We had an event in the inferior, but we are not interested
1468 in handling it at this level. The lower layers have already
1469 done what needs to be done, if anything.
1471 One of the possible circumstances for this is when the
1472 inferior produces output for the console. The inferior has
1473 not stopped, and we are ignoring the event. Another possible
1474 circumstance is any event which the lower level knows will be
1475 reported multiple times without an intervening resume. */
1476 case TARGET_WAITKIND_IGNORE
:
1477 prepare_to_wait (ecs
);
1481 /* We may want to consider not doing a resume here in order to give
1482 the user a chance to play with the new thread. It might be good
1483 to make that a user-settable option. */
1485 /* At this point, all threads are stopped (happens automatically in
1486 either the OS or the native code). Therefore we need to continue
1487 all threads in order to make progress. */
1488 if (ecs
->new_thread_event
)
1490 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1491 prepare_to_wait (ecs
);
1495 stop_pc
= read_pc_pid (ecs
->ptid
);
1497 /* See if a thread hit a thread-specific breakpoint that was meant for
1498 another thread. If so, then step that thread past the breakpoint,
1501 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1503 /* Check if a regular breakpoint has been hit before checking
1504 for a potential single step breakpoint. Otherwise, GDB will
1505 not see this breakpoint hit when stepping onto breakpoints. */
1506 if (breakpoints_inserted
1507 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
1509 ecs
->random_signal
= 0;
1510 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
,
1515 /* Saw a breakpoint, but it was hit by the wrong thread.
1517 if (DECR_PC_AFTER_BREAK
)
1518 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
, ecs
->ptid
);
1520 remove_status
= remove_breakpoints ();
1521 /* Did we fail to remove breakpoints? If so, try
1522 to set the PC past the bp. (There's at least
1523 one situation in which we can fail to remove
1524 the bp's: On HP-UX's that use ttrace, we can't
1525 change the address space of a vforking child
1526 process until the child exits (well, okay, not
1527 then either :-) or execs. */
1528 if (remove_status
!= 0)
1530 /* FIXME! This is obviously non-portable! */
1531 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
+ 4, ecs
->ptid
);
1532 /* We need to restart all the threads now,
1533 * unles we're running in scheduler-locked mode.
1534 * Use currently_stepping to determine whether to
1537 /* FIXME MVS: is there any reason not to call resume()? */
1538 if (scheduler_mode
== schedlock_on
)
1539 target_resume (ecs
->ptid
,
1540 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1542 target_resume (RESUME_ALL
,
1543 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1544 prepare_to_wait (ecs
);
1549 breakpoints_inserted
= 0;
1550 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1551 context_switch (ecs
);
1552 ecs
->waiton_ptid
= ecs
->ptid
;
1553 ecs
->wp
= &(ecs
->ws
);
1554 ecs
->another_trap
= 1;
1556 ecs
->infwait_state
= infwait_thread_hop_state
;
1558 registers_changed ();
1563 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1565 /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK
1566 compared to the value it would have if the system stepping
1567 capability was used. This allows the rest of the code in
1568 this function to use this address without having to worry
1569 whether software single step is in use or not. */
1570 if (DECR_PC_AFTER_BREAK
)
1572 stop_pc
-= DECR_PC_AFTER_BREAK
;
1573 write_pc_pid (stop_pc
, ecs
->ptid
);
1576 sw_single_step_trap_p
= 1;
1577 ecs
->random_signal
= 0;
1581 ecs
->random_signal
= 1;
1583 /* See if something interesting happened to the non-current thread. If
1584 so, then switch to that thread, and eventually give control back to
1587 Note that if there's any kind of pending follow (i.e., of a fork,
1588 vfork or exec), we don't want to do this now. Rather, we'll let
1589 the next resume handle it. */
1590 if (!ptid_equal (ecs
->ptid
, inferior_ptid
) &&
1591 (pending_follow
.kind
== TARGET_WAITKIND_SPURIOUS
))
1595 /* If it's a random signal for a non-current thread, notify user
1596 if he's expressed an interest. */
1597 if (ecs
->random_signal
&& signal_print
[stop_signal
])
1599 /* ??rehrauer: I don't understand the rationale for this code. If the
1600 inferior will stop as a result of this signal, then the act of handling
1601 the stop ought to print a message that's couches the stoppage in user
1602 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1603 won't stop as a result of the signal -- i.e., if the signal is merely
1604 a side-effect of something GDB's doing "under the covers" for the
1605 user, such as stepping threads over a breakpoint they shouldn't stop
1606 for -- then the message seems to be a serious annoyance at best.
1608 For now, remove the message altogether. */
1611 target_terminal_ours_for_output ();
1612 printf_filtered ("\nProgram received signal %s, %s.\n",
1613 target_signal_to_name (stop_signal
),
1614 target_signal_to_string (stop_signal
));
1615 gdb_flush (gdb_stdout
);
1619 /* If it's not SIGTRAP and not a signal we want to stop for, then
1620 continue the thread. */
1622 if (stop_signal
!= TARGET_SIGNAL_TRAP
&& !signal_stop
[stop_signal
])
1625 target_terminal_inferior ();
1627 /* Clear the signal if it should not be passed. */
1628 if (signal_program
[stop_signal
] == 0)
1629 stop_signal
= TARGET_SIGNAL_0
;
1631 target_resume (ecs
->ptid
, 0, stop_signal
);
1632 prepare_to_wait (ecs
);
1636 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1637 and fall into the rest of wait_for_inferior(). */
1639 context_switch (ecs
);
1642 context_hook (pid_to_thread_id (ecs
->ptid
));
1644 flush_cached_frames ();
1647 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1649 /* Pull the single step breakpoints out of the target. */
1650 SOFTWARE_SINGLE_STEP (0, 0);
1651 singlestep_breakpoints_inserted_p
= 0;
1654 /* If PC is pointing at a nullified instruction, then step beyond
1655 it so that the user won't be confused when GDB appears to be ready
1658 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1659 if (INSTRUCTION_NULLIFIED
)
1661 registers_changed ();
1662 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1664 /* We may have received a signal that we want to pass to
1665 the inferior; therefore, we must not clobber the waitstatus
1668 ecs
->infwait_state
= infwait_nullified_state
;
1669 ecs
->waiton_ptid
= ecs
->ptid
;
1670 ecs
->wp
= &(ecs
->tmpstatus
);
1671 prepare_to_wait (ecs
);
1675 /* It may not be necessary to disable the watchpoint to stop over
1676 it. For example, the PA can (with some kernel cooperation)
1677 single step over a watchpoint without disabling the watchpoint. */
1678 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1681 prepare_to_wait (ecs
);
1685 /* It is far more common to need to disable a watchpoint to step
1686 the inferior over it. FIXME. What else might a debug
1687 register or page protection watchpoint scheme need here? */
1688 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1690 /* At this point, we are stopped at an instruction which has
1691 attempted to write to a piece of memory under control of
1692 a watchpoint. The instruction hasn't actually executed
1693 yet. If we were to evaluate the watchpoint expression
1694 now, we would get the old value, and therefore no change
1695 would seem to have occurred.
1697 In order to make watchpoints work `right', we really need
1698 to complete the memory write, and then evaluate the
1699 watchpoint expression. The following code does that by
1700 removing the watchpoint (actually, all watchpoints and
1701 breakpoints), single-stepping the target, re-inserting
1702 watchpoints, and then falling through to let normal
1703 single-step processing handle proceed. Since this
1704 includes evaluating watchpoints, things will come to a
1705 stop in the correct manner. */
1707 if (DECR_PC_AFTER_BREAK
)
1708 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
1710 remove_breakpoints ();
1711 registers_changed ();
1712 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1714 ecs
->waiton_ptid
= ecs
->ptid
;
1715 ecs
->wp
= &(ecs
->ws
);
1716 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1717 prepare_to_wait (ecs
);
1721 /* It may be possible to simply continue after a watchpoint. */
1722 if (HAVE_CONTINUABLE_WATCHPOINT
)
1723 STOPPED_BY_WATCHPOINT (ecs
->ws
);
1725 ecs
->stop_func_start
= 0;
1726 ecs
->stop_func_end
= 0;
1727 ecs
->stop_func_name
= 0;
1728 /* Don't care about return value; stop_func_start and stop_func_name
1729 will both be 0 if it doesn't work. */
1730 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1731 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1732 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
1733 ecs
->another_trap
= 0;
1734 bpstat_clear (&stop_bpstat
);
1736 stop_stack_dummy
= 0;
1737 stop_print_frame
= 1;
1738 ecs
->random_signal
= 0;
1739 stopped_by_random_signal
= 0;
1740 breakpoints_failed
= 0;
1742 /* Look at the cause of the stop, and decide what to do.
1743 The alternatives are:
1744 1) break; to really stop and return to the debugger,
1745 2) drop through to start up again
1746 (set ecs->another_trap to 1 to single step once)
1747 3) set ecs->random_signal to 1, and the decision between 1 and 2
1748 will be made according to the signal handling tables. */
1750 /* First, distinguish signals caused by the debugger from signals
1751 that have to do with the program's own actions.
1752 Note that breakpoint insns may cause SIGTRAP or SIGILL
1753 or SIGEMT, depending on the operating system version.
1754 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1755 and change it to SIGTRAP. */
1757 if (stop_signal
== TARGET_SIGNAL_TRAP
1758 || (breakpoints_inserted
&&
1759 (stop_signal
== TARGET_SIGNAL_ILL
1760 || stop_signal
== TARGET_SIGNAL_EMT
)) || stop_soon_quietly
)
1762 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1764 stop_print_frame
= 0;
1765 stop_stepping (ecs
);
1768 if (stop_soon_quietly
)
1770 stop_stepping (ecs
);
1774 /* Don't even think about breakpoints
1775 if just proceeded over a breakpoint.
1777 However, if we are trying to proceed over a breakpoint
1778 and end up in sigtramp, then through_sigtramp_breakpoint
1779 will be set and we should check whether we've hit the
1781 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
1782 && through_sigtramp_breakpoint
== NULL
)
1783 bpstat_clear (&stop_bpstat
);
1786 /* See if there is a breakpoint at the current PC. */
1788 /* The second argument of bpstat_stop_status is meant to help
1789 distinguish between a breakpoint trap and a singlestep trap.
1790 This is only important on targets where DECR_PC_AFTER_BREAK
1791 is non-zero. The prev_pc test is meant to distinguish between
1792 singlestepping a trap instruction, and singlestepping thru a
1793 jump to the instruction following a trap instruction.
1795 Therefore, pass TRUE if our reason for stopping is
1796 something other than hitting a breakpoint. We do this by
1797 checking that either: we detected earlier a software single
1798 step trap or, 1) stepping is going on and 2) we didn't hit
1799 a breakpoint in a signal handler without an intervening stop
1800 in sigtramp, which is detected by a new stack pointer value
1801 below any usual function calling stack adjustments. */
1805 sw_single_step_trap_p
1806 || (currently_stepping (ecs
)
1807 && prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
1809 && INNER_THAN (read_sp (), (step_sp
- 16)))));
1810 /* Following in case break condition called a
1812 stop_print_frame
= 1;
1815 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1817 = !(bpstat_explains_signal (stop_bpstat
)
1819 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
1820 && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
1821 get_frame_base (get_current_frame ())))
1822 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1826 ecs
->random_signal
= !(bpstat_explains_signal (stop_bpstat
)
1827 /* End of a stack dummy. Some systems (e.g. Sony
1828 news) give another signal besides SIGTRAP, so
1829 check here as well as above. */
1830 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
1831 && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
1835 if (!ecs
->random_signal
)
1836 stop_signal
= TARGET_SIGNAL_TRAP
;
1840 /* When we reach this point, we've pretty much decided
1841 that the reason for stopping must've been a random
1842 (unexpected) signal. */
1845 ecs
->random_signal
= 1;
1847 process_event_stop_test
:
1848 /* For the program's own signals, act according to
1849 the signal handling tables. */
1851 if (ecs
->random_signal
)
1853 /* Signal not for debugging purposes. */
1856 stopped_by_random_signal
= 1;
1858 if (signal_print
[stop_signal
])
1861 target_terminal_ours_for_output ();
1862 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1864 if (signal_stop
[stop_signal
])
1866 stop_stepping (ecs
);
1869 /* If not going to stop, give terminal back
1870 if we took it away. */
1872 target_terminal_inferior ();
1874 /* Clear the signal if it should not be passed. */
1875 if (signal_program
[stop_signal
] == 0)
1876 stop_signal
= TARGET_SIGNAL_0
;
1878 /* I'm not sure whether this needs to be check_sigtramp2 or
1879 whether it could/should be keep_going.
1881 This used to jump to step_over_function if we are stepping,
1884 Suppose the user does a `next' over a function call, and while
1885 that call is in progress, the inferior receives a signal for
1886 which GDB does not stop (i.e., signal_stop[SIG] is false). In
1887 that case, when we reach this point, there is already a
1888 step-resume breakpoint established, right where it should be:
1889 immediately after the function call the user is "next"-ing
1890 over. If we call step_over_function now, two bad things
1893 - we'll create a new breakpoint, at wherever the current
1894 frame's return address happens to be. That could be
1895 anywhere, depending on what function call happens to be on
1896 the top of the stack at that point. Point is, it's probably
1897 not where we need it.
1899 - the existing step-resume breakpoint (which is at the correct
1900 address) will get orphaned: step_resume_breakpoint will point
1901 to the new breakpoint, and the old step-resume breakpoint
1902 will never be cleaned up.
1904 The old behavior was meant to help HP-UX single-step out of
1905 sigtramps. It would place the new breakpoint at prev_pc, which
1906 was certainly wrong. I don't know the details there, so fixing
1907 this probably breaks that. As with anything else, it's up to
1908 the HP-UX maintainer to furnish a fix that doesn't break other
1909 platforms. --JimB, 20 May 1999 */
1910 check_sigtramp2 (ecs
);
1915 /* Handle cases caused by hitting a breakpoint. */
1917 CORE_ADDR jmp_buf_pc
;
1918 struct bpstat_what what
;
1920 what
= bpstat_what (stop_bpstat
);
1922 if (what
.call_dummy
)
1924 stop_stack_dummy
= 1;
1926 trap_expected_after_continue
= 1;
1930 switch (what
.main_action
)
1932 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
1933 /* If we hit the breakpoint at longjmp, disable it for the
1934 duration of this command. Then, install a temporary
1935 breakpoint at the target of the jmp_buf. */
1936 disable_longjmp_breakpoint ();
1937 remove_breakpoints ();
1938 breakpoints_inserted
= 0;
1939 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
1945 /* Need to blow away step-resume breakpoint, as it
1946 interferes with us */
1947 if (step_resume_breakpoint
!= NULL
)
1949 delete_step_resume_breakpoint (&step_resume_breakpoint
);
1951 /* Not sure whether we need to blow this away too, but probably
1952 it is like the step-resume breakpoint. */
1953 if (through_sigtramp_breakpoint
!= NULL
)
1955 delete_breakpoint (through_sigtramp_breakpoint
);
1956 through_sigtramp_breakpoint
= NULL
;
1960 /* FIXME - Need to implement nested temporary breakpoints */
1961 if (step_over_calls
> 0)
1962 set_longjmp_resume_breakpoint (jmp_buf_pc
, get_current_frame ());
1965 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
1966 ecs
->handling_longjmp
= 1; /* FIXME */
1970 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
1971 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
1972 remove_breakpoints ();
1973 breakpoints_inserted
= 0;
1975 /* FIXME - Need to implement nested temporary breakpoints */
1977 && (frame_id_inner (get_frame_id (get_current_frame ()),
1980 ecs
->another_trap
= 1;
1985 disable_longjmp_breakpoint ();
1986 ecs
->handling_longjmp
= 0; /* FIXME */
1987 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
1989 /* else fallthrough */
1991 case BPSTAT_WHAT_SINGLE
:
1992 if (breakpoints_inserted
)
1994 remove_breakpoints ();
1996 breakpoints_inserted
= 0;
1997 ecs
->another_trap
= 1;
1998 /* Still need to check other stuff, at least the case
1999 where we are stepping and step out of the right range. */
2002 case BPSTAT_WHAT_STOP_NOISY
:
2003 stop_print_frame
= 1;
2005 /* We are about to nuke the step_resume_breakpoint and
2006 through_sigtramp_breakpoint via the cleanup chain, so
2007 no need to worry about it here. */
2009 stop_stepping (ecs
);
2012 case BPSTAT_WHAT_STOP_SILENT
:
2013 stop_print_frame
= 0;
2015 /* We are about to nuke the step_resume_breakpoint and
2016 through_sigtramp_breakpoint via the cleanup chain, so
2017 no need to worry about it here. */
2019 stop_stepping (ecs
);
2022 case BPSTAT_WHAT_STEP_RESUME
:
2023 /* This proably demands a more elegant solution, but, yeah
2026 This function's use of the simple variable
2027 step_resume_breakpoint doesn't seem to accomodate
2028 simultaneously active step-resume bp's, although the
2029 breakpoint list certainly can.
2031 If we reach here and step_resume_breakpoint is already
2032 NULL, then apparently we have multiple active
2033 step-resume bp's. We'll just delete the breakpoint we
2034 stopped at, and carry on.
2036 Correction: what the code currently does is delete a
2037 step-resume bp, but it makes no effort to ensure that
2038 the one deleted is the one currently stopped at. MVS */
2040 if (step_resume_breakpoint
== NULL
)
2042 step_resume_breakpoint
=
2043 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2045 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2048 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2049 if (through_sigtramp_breakpoint
)
2050 delete_breakpoint (through_sigtramp_breakpoint
);
2051 through_sigtramp_breakpoint
= NULL
;
2053 /* If were waiting for a trap, hitting the step_resume_break
2054 doesn't count as getting it. */
2056 ecs
->another_trap
= 1;
2059 case BPSTAT_WHAT_CHECK_SHLIBS
:
2060 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2063 /* Remove breakpoints, we eventually want to step over the
2064 shlib event breakpoint, and SOLIB_ADD might adjust
2065 breakpoint addresses via breakpoint_re_set. */
2066 if (breakpoints_inserted
)
2067 remove_breakpoints ();
2068 breakpoints_inserted
= 0;
2070 /* Check for any newly added shared libraries if we're
2071 supposed to be adding them automatically. Switch
2072 terminal for any messages produced by
2073 breakpoint_re_set. */
2074 target_terminal_ours_for_output ();
2075 SOLIB_ADD (NULL
, 0, NULL
, auto_solib_add
);
2076 target_terminal_inferior ();
2078 /* Try to reenable shared library breakpoints, additional
2079 code segments in shared libraries might be mapped in now. */
2080 re_enable_breakpoints_in_shlibs ();
2082 /* If requested, stop when the dynamic linker notifies
2083 gdb of events. This allows the user to get control
2084 and place breakpoints in initializer routines for
2085 dynamically loaded objects (among other things). */
2086 if (stop_on_solib_events
)
2088 stop_stepping (ecs
);
2092 /* If we stopped due to an explicit catchpoint, then the
2093 (see above) call to SOLIB_ADD pulled in any symbols
2094 from a newly-loaded library, if appropriate.
2096 We do want the inferior to stop, but not where it is
2097 now, which is in the dynamic linker callback. Rather,
2098 we would like it stop in the user's program, just after
2099 the call that caused this catchpoint to trigger. That
2100 gives the user a more useful vantage from which to
2101 examine their program's state. */
2102 else if (what
.main_action
==
2103 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2105 /* ??rehrauer: If I could figure out how to get the
2106 right return PC from here, we could just set a temp
2107 breakpoint and resume. I'm not sure we can without
2108 cracking open the dld's shared libraries and sniffing
2109 their unwind tables and text/data ranges, and that's
2110 not a terribly portable notion.
2112 Until that time, we must step the inferior out of the
2113 dld callback, and also out of the dld itself (and any
2114 code or stubs in libdld.sl, such as "shl_load" and
2115 friends) until we reach non-dld code. At that point,
2116 we can stop stepping. */
2117 bpstat_get_triggered_catchpoints (stop_bpstat
,
2119 stepping_through_solib_catchpoints
);
2120 ecs
->stepping_through_solib_after_catch
= 1;
2122 /* Be sure to lift all breakpoints, so the inferior does
2123 actually step past this point... */
2124 ecs
->another_trap
= 1;
2129 /* We want to step over this breakpoint, then keep going. */
2130 ecs
->another_trap
= 1;
2137 case BPSTAT_WHAT_LAST
:
2138 /* Not a real code, but listed here to shut up gcc -Wall. */
2140 case BPSTAT_WHAT_KEEP_CHECKING
:
2145 /* We come here if we hit a breakpoint but should not
2146 stop for it. Possibly we also were stepping
2147 and should stop for that. So fall through and
2148 test for stepping. But, if not stepping,
2151 /* Are we stepping to get the inferior out of the dynamic
2152 linker's hook (and possibly the dld itself) after catching
2154 if (ecs
->stepping_through_solib_after_catch
)
2156 #if defined(SOLIB_ADD)
2157 /* Have we reached our destination? If not, keep going. */
2158 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2160 ecs
->another_trap
= 1;
2165 /* Else, stop and report the catchpoint(s) whose triggering
2166 caused us to begin stepping. */
2167 ecs
->stepping_through_solib_after_catch
= 0;
2168 bpstat_clear (&stop_bpstat
);
2169 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2170 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2171 stop_print_frame
= 1;
2172 stop_stepping (ecs
);
2176 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P
)
2178 /* This is the old way of detecting the end of the stack dummy.
2179 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2180 handled above. As soon as we can test it on all of them, all
2181 architectures should define it. */
2183 /* If this is the breakpoint at the end of a stack dummy,
2184 just stop silently, unless the user was doing an si/ni, in which
2185 case she'd better know what she's doing. */
2187 if (CALL_DUMMY_HAS_COMPLETED (stop_pc
, read_sp (),
2188 get_frame_base (get_current_frame ()))
2191 stop_print_frame
= 0;
2192 stop_stack_dummy
= 1;
2194 trap_expected_after_continue
= 1;
2196 stop_stepping (ecs
);
2201 if (step_resume_breakpoint
)
2203 /* Having a step-resume breakpoint overrides anything
2204 else having to do with stepping commands until
2205 that breakpoint is reached. */
2206 /* I'm not sure whether this needs to be check_sigtramp2 or
2207 whether it could/should be keep_going. */
2208 check_sigtramp2 (ecs
);
2213 if (step_range_end
== 0)
2215 /* Likewise if we aren't even stepping. */
2216 /* I'm not sure whether this needs to be check_sigtramp2 or
2217 whether it could/should be keep_going. */
2218 check_sigtramp2 (ecs
);
2223 /* If stepping through a line, keep going if still within it.
2225 Note that step_range_end is the address of the first instruction
2226 beyond the step range, and NOT the address of the last instruction
2228 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2230 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2231 So definately need to check for sigtramp here. */
2232 check_sigtramp2 (ecs
);
2237 /* We stepped out of the stepping range. */
2239 /* If we are stepping at the source level and entered the runtime
2240 loader dynamic symbol resolution code, we keep on single stepping
2241 until we exit the run time loader code and reach the callee's
2243 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2244 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2246 CORE_ADDR pc_after_resolver
= SKIP_SOLIB_RESOLVER (stop_pc
);
2248 if (pc_after_resolver
)
2250 /* Set up a step-resume breakpoint at the address
2251 indicated by SKIP_SOLIB_RESOLVER. */
2252 struct symtab_and_line sr_sal
;
2254 sr_sal
.pc
= pc_after_resolver
;
2256 check_for_old_step_resume_breakpoint ();
2257 step_resume_breakpoint
=
2258 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2259 if (breakpoints_inserted
)
2260 insert_breakpoints ();
2267 /* We can't update step_sp every time through the loop, because
2268 reading the stack pointer would slow down stepping too much.
2269 But we can update it every time we leave the step range. */
2270 ecs
->update_step_sp
= 1;
2272 /* Did we just take a signal? */
2273 if (PC_IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2274 && !PC_IN_SIGTRAMP (prev_pc
, prev_func_name
)
2275 && INNER_THAN (read_sp (), step_sp
))
2277 /* We've just taken a signal; go until we are back to
2278 the point where we took it and one more. */
2280 /* Note: The test above succeeds not only when we stepped
2281 into a signal handler, but also when we step past the last
2282 statement of a signal handler and end up in the return stub
2283 of the signal handler trampoline. To distinguish between
2284 these two cases, check that the frame is INNER_THAN the
2285 previous one below. pai/1997-09-11 */
2289 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2291 if (frame_id_inner (current_frame
, step_frame_id
))
2293 /* We have just taken a signal; go until we are back to
2294 the point where we took it and one more. */
2296 /* This code is needed at least in the following case:
2297 The user types "next" and then a signal arrives (before
2298 the "next" is done). */
2300 /* Note that if we are stopped at a breakpoint, then we need
2301 the step_resume breakpoint to override any breakpoints at
2302 the same location, so that we will still step over the
2303 breakpoint even though the signal happened. */
2304 struct symtab_and_line sr_sal
;
2307 sr_sal
.symtab
= NULL
;
2309 sr_sal
.pc
= prev_pc
;
2310 /* We could probably be setting the frame to
2311 step_frame_id; I don't think anyone thought to try it. */
2312 check_for_old_step_resume_breakpoint ();
2313 step_resume_breakpoint
=
2314 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2315 if (breakpoints_inserted
)
2316 insert_breakpoints ();
2320 /* We just stepped out of a signal handler and into
2321 its calling trampoline.
2323 Normally, we'd call step_over_function from
2324 here, but for some reason GDB can't unwind the
2325 stack correctly to find the real PC for the point
2326 user code where the signal trampoline will return
2327 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2328 But signal trampolines are pretty small stubs of
2329 code, anyway, so it's OK instead to just
2330 single-step out. Note: assuming such trampolines
2331 don't exhibit recursion on any platform... */
2332 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2333 &ecs
->stop_func_start
,
2334 &ecs
->stop_func_end
);
2335 /* Readjust stepping range */
2336 step_range_start
= ecs
->stop_func_start
;
2337 step_range_end
= ecs
->stop_func_end
;
2338 ecs
->stepping_through_sigtramp
= 1;
2343 /* If this is stepi or nexti, make sure that the stepping range
2344 gets us past that instruction. */
2345 if (step_range_end
== 1)
2346 /* FIXME: Does this run afoul of the code below which, if
2347 we step into the middle of a line, resets the stepping
2349 step_range_end
= (step_range_start
= prev_pc
) + 1;
2351 ecs
->remove_breakpoints_on_following_step
= 1;
2356 if (stop_pc
== ecs
->stop_func_start
/* Quick test */
2357 || (in_prologue (stop_pc
, ecs
->stop_func_start
) &&
2358 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2359 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
)
2360 || ecs
->stop_func_name
== 0)
2362 /* It's a subroutine call. */
2364 if ((step_over_calls
== STEP_OVER_NONE
)
2365 || ((step_range_end
== 1)
2366 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2368 /* I presume that step_over_calls is only 0 when we're
2369 supposed to be stepping at the assembly language level
2370 ("stepi"). Just stop. */
2371 /* Also, maybe we just did a "nexti" inside a prolog,
2372 so we thought it was a subroutine call but it was not.
2373 Stop as well. FENN */
2375 print_stop_reason (END_STEPPING_RANGE
, 0);
2376 stop_stepping (ecs
);
2380 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
2382 /* We're doing a "next". */
2384 if (PC_IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2385 && frame_id_inner (step_frame_id
,
2386 frame_id_build (read_sp (), 0)))
2387 /* We stepped out of a signal handler, and into its
2388 calling trampoline. This is misdetected as a
2389 subroutine call, but stepping over the signal
2390 trampoline isn't such a bad idea. In order to do that,
2391 we have to ignore the value in step_frame_id, since
2392 that doesn't represent the frame that'll reach when we
2393 return from the signal trampoline. Otherwise we'll
2394 probably continue to the end of the program. */
2395 step_frame_id
= null_frame_id
;
2397 step_over_function (ecs
);
2402 /* If we are in a function call trampoline (a stub between
2403 the calling routine and the real function), locate the real
2404 function. That's what tells us (a) whether we want to step
2405 into it at all, and (b) what prologue we want to run to
2406 the end of, if we do step into it. */
2407 real_stop_pc
= skip_language_trampoline (stop_pc
);
2408 if (real_stop_pc
== 0)
2409 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2410 if (real_stop_pc
!= 0)
2411 ecs
->stop_func_start
= real_stop_pc
;
2413 /* If we have line number information for the function we
2414 are thinking of stepping into, step into it.
2416 If there are several symtabs at that PC (e.g. with include
2417 files), just want to know whether *any* of them have line
2418 numbers. find_pc_line handles this. */
2420 struct symtab_and_line tmp_sal
;
2422 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2423 if (tmp_sal
.line
!= 0)
2425 step_into_function (ecs
);
2430 /* If we have no line number and the step-stop-if-no-debug
2431 is set, we stop the step so that the user has a chance to
2432 switch in assembly mode. */
2433 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2436 print_stop_reason (END_STEPPING_RANGE
, 0);
2437 stop_stepping (ecs
);
2441 step_over_function (ecs
);
2447 /* We've wandered out of the step range. */
2449 ecs
->sal
= find_pc_line (stop_pc
, 0);
2451 if (step_range_end
== 1)
2453 /* It is stepi or nexti. We always want to stop stepping after
2456 print_stop_reason (END_STEPPING_RANGE
, 0);
2457 stop_stepping (ecs
);
2461 /* If we're in the return path from a shared library trampoline,
2462 we want to proceed through the trampoline when stepping. */
2463 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2465 /* Determine where this trampoline returns. */
2466 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2468 /* Only proceed through if we know where it's going. */
2471 /* And put the step-breakpoint there and go until there. */
2472 struct symtab_and_line sr_sal
;
2474 init_sal (&sr_sal
); /* initialize to zeroes */
2475 sr_sal
.pc
= real_stop_pc
;
2476 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2477 /* Do not specify what the fp should be when we stop
2478 since on some machines the prologue
2479 is where the new fp value is established. */
2480 check_for_old_step_resume_breakpoint ();
2481 step_resume_breakpoint
=
2482 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2483 if (breakpoints_inserted
)
2484 insert_breakpoints ();
2486 /* Restart without fiddling with the step ranges or
2493 if (ecs
->sal
.line
== 0)
2495 /* We have no line number information. That means to stop
2496 stepping (does this always happen right after one instruction,
2497 when we do "s" in a function with no line numbers,
2498 or can this happen as a result of a return or longjmp?). */
2500 print_stop_reason (END_STEPPING_RANGE
, 0);
2501 stop_stepping (ecs
);
2505 if ((stop_pc
== ecs
->sal
.pc
)
2506 && (ecs
->current_line
!= ecs
->sal
.line
2507 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2509 /* We are at the start of a different line. So stop. Note that
2510 we don't stop if we step into the middle of a different line.
2511 That is said to make things like for (;;) statements work
2514 print_stop_reason (END_STEPPING_RANGE
, 0);
2515 stop_stepping (ecs
);
2519 /* We aren't done stepping.
2521 Optimize by setting the stepping range to the line.
2522 (We might not be in the original line, but if we entered a
2523 new line in mid-statement, we continue stepping. This makes
2524 things like for(;;) statements work better.) */
2526 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2528 /* If this is the last line of the function, don't keep stepping
2529 (it would probably step us out of the function).
2530 This is particularly necessary for a one-line function,
2531 in which after skipping the prologue we better stop even though
2532 we will be in mid-line. */
2534 print_stop_reason (END_STEPPING_RANGE
, 0);
2535 stop_stepping (ecs
);
2538 step_range_start
= ecs
->sal
.pc
;
2539 step_range_end
= ecs
->sal
.end
;
2540 step_frame_id
= get_frame_id (get_current_frame ());
2541 ecs
->current_line
= ecs
->sal
.line
;
2542 ecs
->current_symtab
= ecs
->sal
.symtab
;
2544 /* In the case where we just stepped out of a function into the
2545 middle of a line of the caller, continue stepping, but
2546 step_frame_id must be modified to current frame */
2548 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2549 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2550 step_frame_id
= current_frame
;
2556 /* Are we in the middle of stepping? */
2559 currently_stepping (struct execution_control_state
*ecs
)
2561 return ((through_sigtramp_breakpoint
== NULL
2562 && !ecs
->handling_longjmp
2563 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2565 || ecs
->stepping_through_solib_after_catch
2566 || bpstat_should_step ());
2570 check_sigtramp2 (struct execution_control_state
*ecs
)
2573 && PC_IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2574 && !PC_IN_SIGTRAMP (prev_pc
, prev_func_name
)
2575 && INNER_THAN (read_sp (), step_sp
))
2577 /* What has happened here is that we have just stepped the
2578 inferior with a signal (because it is a signal which
2579 shouldn't make us stop), thus stepping into sigtramp.
2581 So we need to set a step_resume_break_address breakpoint and
2582 continue until we hit it, and then step. FIXME: This should
2583 be more enduring than a step_resume breakpoint; we should
2584 know that we will later need to keep going rather than
2585 re-hitting the breakpoint here (see the testsuite,
2586 gdb.base/signals.exp where it says "exceedingly difficult"). */
2588 struct symtab_and_line sr_sal
;
2590 init_sal (&sr_sal
); /* initialize to zeroes */
2591 sr_sal
.pc
= prev_pc
;
2592 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2593 /* We perhaps could set the frame if we kept track of what the
2594 frame corresponding to prev_pc was. But we don't, so don't. */
2595 through_sigtramp_breakpoint
=
2596 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_through_sigtramp
);
2597 if (breakpoints_inserted
)
2598 insert_breakpoints ();
2600 ecs
->remove_breakpoints_on_following_step
= 1;
2601 ecs
->another_trap
= 1;
2605 /* Subroutine call with source code we should not step over. Do step
2606 to the first line of code in it. */
2609 step_into_function (struct execution_control_state
*ecs
)
2612 struct symtab_and_line sr_sal
;
2614 s
= find_pc_symtab (stop_pc
);
2615 if (s
&& s
->language
!= language_asm
)
2616 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2618 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2619 /* Use the step_resume_break to step until the end of the prologue,
2620 even if that involves jumps (as it seems to on the vax under
2622 /* If the prologue ends in the middle of a source line, continue to
2623 the end of that source line (if it is still within the function).
2624 Otherwise, just go to end of prologue. */
2625 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2626 /* no, don't either. It skips any code that's legitimately on the
2630 && ecs
->sal
.pc
!= ecs
->stop_func_start
2631 && ecs
->sal
.end
< ecs
->stop_func_end
)
2632 ecs
->stop_func_start
= ecs
->sal
.end
;
2635 if (ecs
->stop_func_start
== stop_pc
)
2637 /* We are already there: stop now. */
2639 print_stop_reason (END_STEPPING_RANGE
, 0);
2640 stop_stepping (ecs
);
2645 /* Put the step-breakpoint there and go until there. */
2646 init_sal (&sr_sal
); /* initialize to zeroes */
2647 sr_sal
.pc
= ecs
->stop_func_start
;
2648 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2649 /* Do not specify what the fp should be when we stop since on
2650 some machines the prologue is where the new fp value is
2652 check_for_old_step_resume_breakpoint ();
2653 step_resume_breakpoint
=
2654 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2655 if (breakpoints_inserted
)
2656 insert_breakpoints ();
2658 /* And make sure stepping stops right away then. */
2659 step_range_end
= step_range_start
;
2664 /* We've just entered a callee, and we wish to resume until it returns
2665 to the caller. Setting a step_resume breakpoint on the return
2666 address will catch a return from the callee.
2668 However, if the callee is recursing, we want to be careful not to
2669 catch returns of those recursive calls, but only of THIS instance
2672 To do this, we set the step_resume bp's frame to our current
2673 caller's frame (step_frame_id, which is set by the "next" or
2674 "until" command, before execution begins). */
2677 step_over_function (struct execution_control_state
*ecs
)
2679 struct symtab_and_line sr_sal
;
2681 init_sal (&sr_sal
); /* initialize to zeros */
2682 sr_sal
.pc
= ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
2683 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2685 check_for_old_step_resume_breakpoint ();
2686 step_resume_breakpoint
=
2687 set_momentary_breakpoint (sr_sal
, get_frame_id (get_current_frame ()),
2690 if (frame_id_p (step_frame_id
)
2691 && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal
.pc
))
2692 step_resume_breakpoint
->frame_id
= step_frame_id
;
2694 if (breakpoints_inserted
)
2695 insert_breakpoints ();
2699 stop_stepping (struct execution_control_state
*ecs
)
2701 if (target_has_execution
)
2703 /* Assuming the inferior still exists, set these up for next
2704 time, just like we did above if we didn't break out of the
2706 prev_pc
= read_pc ();
2707 prev_func_start
= ecs
->stop_func_start
;
2708 prev_func_name
= ecs
->stop_func_name
;
2711 /* Let callers know we don't want to wait for the inferior anymore. */
2712 ecs
->wait_some_more
= 0;
2715 /* This function handles various cases where we need to continue
2716 waiting for the inferior. */
2717 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2720 keep_going (struct execution_control_state
*ecs
)
2722 /* Save the pc before execution, to compare with pc after stop. */
2723 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2724 prev_func_start
= ecs
->stop_func_start
; /* Ok, since if DECR_PC_AFTER
2725 BREAK is defined, the
2726 original pc would not have
2727 been at the start of a
2729 prev_func_name
= ecs
->stop_func_name
;
2731 if (ecs
->update_step_sp
)
2732 step_sp
= read_sp ();
2733 ecs
->update_step_sp
= 0;
2735 /* If we did not do break;, it means we should keep running the
2736 inferior and not return to debugger. */
2738 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2740 /* We took a signal (which we are supposed to pass through to
2741 the inferior, else we'd have done a break above) and we
2742 haven't yet gotten our trap. Simply continue. */
2743 resume (currently_stepping (ecs
), stop_signal
);
2747 /* Either the trap was not expected, but we are continuing
2748 anyway (the user asked that this signal be passed to the
2751 The signal was SIGTRAP, e.g. it was our signal, but we
2752 decided we should resume from it.
2754 We're going to run this baby now!
2756 Insert breakpoints now, unless we are trying to one-proceed
2757 past a breakpoint. */
2758 /* If we've just finished a special step resume and we don't
2759 want to hit a breakpoint, pull em out. */
2760 if (step_resume_breakpoint
== NULL
2761 && through_sigtramp_breakpoint
== NULL
2762 && ecs
->remove_breakpoints_on_following_step
)
2764 ecs
->remove_breakpoints_on_following_step
= 0;
2765 remove_breakpoints ();
2766 breakpoints_inserted
= 0;
2768 else if (!breakpoints_inserted
&&
2769 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
2771 breakpoints_failed
= insert_breakpoints ();
2772 if (breakpoints_failed
)
2774 stop_stepping (ecs
);
2777 breakpoints_inserted
= 1;
2780 trap_expected
= ecs
->another_trap
;
2782 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2783 specifies that such a signal should be delivered to the
2786 Typically, this would occure when a user is debugging a
2787 target monitor on a simulator: the target monitor sets a
2788 breakpoint; the simulator encounters this break-point and
2789 halts the simulation handing control to GDB; GDB, noteing
2790 that the break-point isn't valid, returns control back to the
2791 simulator; the simulator then delivers the hardware
2792 equivalent of a SIGNAL_TRAP to the program being debugged. */
2794 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2795 stop_signal
= TARGET_SIGNAL_0
;
2797 #ifdef SHIFT_INST_REGS
2798 /* I'm not sure when this following segment applies. I do know,
2799 now, that we shouldn't rewrite the regs when we were stopped
2800 by a random signal from the inferior process. */
2801 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2802 (this is only used on the 88k). */
2804 if (!bpstat_explains_signal (stop_bpstat
)
2805 && (stop_signal
!= TARGET_SIGNAL_CHLD
) && !stopped_by_random_signal
)
2807 #endif /* SHIFT_INST_REGS */
2809 resume (currently_stepping (ecs
), stop_signal
);
2812 prepare_to_wait (ecs
);
2815 /* This function normally comes after a resume, before
2816 handle_inferior_event exits. It takes care of any last bits of
2817 housekeeping, and sets the all-important wait_some_more flag. */
2820 prepare_to_wait (struct execution_control_state
*ecs
)
2822 if (ecs
->infwait_state
== infwait_normal_state
)
2824 overlay_cache_invalid
= 1;
2826 /* We have to invalidate the registers BEFORE calling
2827 target_wait because they can be loaded from the target while
2828 in target_wait. This makes remote debugging a bit more
2829 efficient for those targets that provide critical registers
2830 as part of their normal status mechanism. */
2832 registers_changed ();
2833 ecs
->waiton_ptid
= pid_to_ptid (-1);
2834 ecs
->wp
= &(ecs
->ws
);
2836 /* This is the old end of the while loop. Let everybody know we
2837 want to wait for the inferior some more and get called again
2839 ecs
->wait_some_more
= 1;
2842 /* Print why the inferior has stopped. We always print something when
2843 the inferior exits, or receives a signal. The rest of the cases are
2844 dealt with later on in normal_stop() and print_it_typical(). Ideally
2845 there should be a call to this function from handle_inferior_event()
2846 each time stop_stepping() is called.*/
2848 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2850 switch (stop_reason
)
2853 /* We don't deal with these cases from handle_inferior_event()
2856 case END_STEPPING_RANGE
:
2857 /* We are done with a step/next/si/ni command. */
2858 /* For now print nothing. */
2859 /* Print a message only if not in the middle of doing a "step n"
2860 operation for n > 1 */
2861 if (!step_multi
|| !stop_step
)
2862 if (ui_out_is_mi_like_p (uiout
))
2863 ui_out_field_string (uiout
, "reason", "end-stepping-range");
2865 case BREAKPOINT_HIT
:
2866 /* We found a breakpoint. */
2867 /* For now print nothing. */
2870 /* The inferior was terminated by a signal. */
2871 annotate_signalled ();
2872 if (ui_out_is_mi_like_p (uiout
))
2873 ui_out_field_string (uiout
, "reason", "exited-signalled");
2874 ui_out_text (uiout
, "\nProgram terminated with signal ");
2875 annotate_signal_name ();
2876 ui_out_field_string (uiout
, "signal-name",
2877 target_signal_to_name (stop_info
));
2878 annotate_signal_name_end ();
2879 ui_out_text (uiout
, ", ");
2880 annotate_signal_string ();
2881 ui_out_field_string (uiout
, "signal-meaning",
2882 target_signal_to_string (stop_info
));
2883 annotate_signal_string_end ();
2884 ui_out_text (uiout
, ".\n");
2885 ui_out_text (uiout
, "The program no longer exists.\n");
2888 /* The inferior program is finished. */
2889 annotate_exited (stop_info
);
2892 if (ui_out_is_mi_like_p (uiout
))
2893 ui_out_field_string (uiout
, "reason", "exited");
2894 ui_out_text (uiout
, "\nProgram exited with code ");
2895 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2896 (unsigned int) stop_info
);
2897 ui_out_text (uiout
, ".\n");
2901 if (ui_out_is_mi_like_p (uiout
))
2902 ui_out_field_string (uiout
, "reason", "exited-normally");
2903 ui_out_text (uiout
, "\nProgram exited normally.\n");
2906 case SIGNAL_RECEIVED
:
2907 /* Signal received. The signal table tells us to print about
2910 ui_out_text (uiout
, "\nProgram received signal ");
2911 annotate_signal_name ();
2912 if (ui_out_is_mi_like_p (uiout
))
2913 ui_out_field_string (uiout
, "reason", "signal-received");
2914 ui_out_field_string (uiout
, "signal-name",
2915 target_signal_to_name (stop_info
));
2916 annotate_signal_name_end ();
2917 ui_out_text (uiout
, ", ");
2918 annotate_signal_string ();
2919 ui_out_field_string (uiout
, "signal-meaning",
2920 target_signal_to_string (stop_info
));
2921 annotate_signal_string_end ();
2922 ui_out_text (uiout
, ".\n");
2925 internal_error (__FILE__
, __LINE__
,
2926 "print_stop_reason: unrecognized enum value");
2932 /* Here to return control to GDB when the inferior stops for real.
2933 Print appropriate messages, remove breakpoints, give terminal our modes.
2935 STOP_PRINT_FRAME nonzero means print the executing frame
2936 (pc, function, args, file, line number and line text).
2937 BREAKPOINTS_FAILED nonzero means stop was due to error
2938 attempting to insert breakpoints. */
2943 /* As with the notification of thread events, we want to delay
2944 notifying the user that we've switched thread context until
2945 the inferior actually stops.
2947 (Note that there's no point in saying anything if the inferior
2949 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
2950 && target_has_execution
)
2952 target_terminal_ours_for_output ();
2953 printf_filtered ("[Switching to %s]\n",
2954 target_pid_or_tid_to_str (inferior_ptid
));
2955 previous_inferior_ptid
= inferior_ptid
;
2958 /* Make sure that the current_frame's pc is correct. This
2959 is a correction for setting up the frame info before doing
2960 DECR_PC_AFTER_BREAK */
2961 if (target_has_execution
)
2962 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2963 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2964 frame code to check for this and sort out any resultant mess.
2965 DECR_PC_AFTER_BREAK needs to just go away. */
2966 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2968 if (target_has_execution
&& breakpoints_inserted
)
2970 if (remove_breakpoints ())
2972 target_terminal_ours_for_output ();
2973 printf_filtered ("Cannot remove breakpoints because ");
2974 printf_filtered ("program is no longer writable.\n");
2975 printf_filtered ("It might be running in another process.\n");
2976 printf_filtered ("Further execution is probably impossible.\n");
2979 breakpoints_inserted
= 0;
2981 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2982 Delete any breakpoint that is to be deleted at the next stop. */
2984 breakpoint_auto_delete (stop_bpstat
);
2986 /* If an auto-display called a function and that got a signal,
2987 delete that auto-display to avoid an infinite recursion. */
2989 if (stopped_by_random_signal
)
2990 disable_current_display ();
2992 /* Don't print a message if in the middle of doing a "step n"
2993 operation for n > 1 */
2994 if (step_multi
&& stop_step
)
2997 target_terminal_ours ();
2999 /* Look up the hook_stop and run it (CLI internally handles problem
3000 of stop_command's pre-hook not existing). */
3002 catch_errors (hook_stop_stub
, stop_command
,
3003 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3005 if (!target_has_stack
)
3011 /* Select innermost stack frame - i.e., current frame is frame 0,
3012 and current location is based on that.
3013 Don't do this on return from a stack dummy routine,
3014 or if the program has exited. */
3016 if (!stop_stack_dummy
)
3018 select_frame (get_current_frame ());
3020 /* Print current location without a level number, if
3021 we have changed functions or hit a breakpoint.
3022 Print source line if we have one.
3023 bpstat_print() contains the logic deciding in detail
3024 what to print, based on the event(s) that just occurred. */
3026 if (stop_print_frame
&& deprecated_selected_frame
)
3030 int do_frame_printing
= 1;
3032 bpstat_ret
= bpstat_print (stop_bpstat
);
3036 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3037 (or should) carry around the function and does (or
3038 should) use that when doing a frame comparison. */
3040 && frame_id_eq (step_frame_id
,
3041 get_frame_id (get_current_frame ()))
3042 && step_start_function
== find_pc_function (stop_pc
))
3043 source_flag
= SRC_LINE
; /* finished step, just print source line */
3045 source_flag
= SRC_AND_LOC
; /* print location and source line */
3047 case PRINT_SRC_AND_LOC
:
3048 source_flag
= SRC_AND_LOC
; /* print location and source line */
3050 case PRINT_SRC_ONLY
:
3051 source_flag
= SRC_LINE
;
3054 source_flag
= SRC_LINE
; /* something bogus */
3055 do_frame_printing
= 0;
3058 internal_error (__FILE__
, __LINE__
, "Unknown value.");
3060 /* For mi, have the same behavior every time we stop:
3061 print everything but the source line. */
3062 if (ui_out_is_mi_like_p (uiout
))
3063 source_flag
= LOC_AND_ADDRESS
;
3065 if (ui_out_is_mi_like_p (uiout
))
3066 ui_out_field_int (uiout
, "thread-id",
3067 pid_to_thread_id (inferior_ptid
));
3068 /* The behavior of this routine with respect to the source
3070 SRC_LINE: Print only source line
3071 LOCATION: Print only location
3072 SRC_AND_LOC: Print location and source line */
3073 if (do_frame_printing
)
3074 print_stack_frame (deprecated_selected_frame
, -1, source_flag
);
3076 /* Display the auto-display expressions. */
3081 /* Save the function value return registers, if we care.
3082 We might be about to restore their previous contents. */
3083 if (proceed_to_finish
)
3084 /* NB: The copy goes through to the target picking up the value of
3085 all the registers. */
3086 regcache_cpy (stop_registers
, current_regcache
);
3088 if (stop_stack_dummy
)
3090 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3091 ends with a setting of the current frame, so we can use that
3093 frame_pop (get_current_frame ());
3094 /* Set stop_pc to what it was before we called the function.
3095 Can't rely on restore_inferior_status because that only gets
3096 called if we don't stop in the called function. */
3097 stop_pc
= read_pc ();
3098 select_frame (get_current_frame ());
3102 annotate_stopped ();
3103 observer_notify_normal_stop ();
3107 hook_stop_stub (void *cmd
)
3109 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3114 signal_stop_state (int signo
)
3116 return signal_stop
[signo
];
3120 signal_print_state (int signo
)
3122 return signal_print
[signo
];
3126 signal_pass_state (int signo
)
3128 return signal_program
[signo
];
3132 signal_stop_update (int signo
, int state
)
3134 int ret
= signal_stop
[signo
];
3135 signal_stop
[signo
] = state
;
3140 signal_print_update (int signo
, int state
)
3142 int ret
= signal_print
[signo
];
3143 signal_print
[signo
] = state
;
3148 signal_pass_update (int signo
, int state
)
3150 int ret
= signal_program
[signo
];
3151 signal_program
[signo
] = state
;
3156 sig_print_header (void)
3159 Signal Stop\tPrint\tPass to program\tDescription\n");
3163 sig_print_info (enum target_signal oursig
)
3165 char *name
= target_signal_to_name (oursig
);
3166 int name_padding
= 13 - strlen (name
);
3168 if (name_padding
<= 0)
3171 printf_filtered ("%s", name
);
3172 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3173 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3174 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3175 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3176 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3179 /* Specify how various signals in the inferior should be handled. */
3182 handle_command (char *args
, int from_tty
)
3185 int digits
, wordlen
;
3186 int sigfirst
, signum
, siglast
;
3187 enum target_signal oursig
;
3190 unsigned char *sigs
;
3191 struct cleanup
*old_chain
;
3195 error_no_arg ("signal to handle");
3198 /* Allocate and zero an array of flags for which signals to handle. */
3200 nsigs
= (int) TARGET_SIGNAL_LAST
;
3201 sigs
= (unsigned char *) alloca (nsigs
);
3202 memset (sigs
, 0, nsigs
);
3204 /* Break the command line up into args. */
3206 argv
= buildargv (args
);
3211 old_chain
= make_cleanup_freeargv (argv
);
3213 /* Walk through the args, looking for signal oursigs, signal names, and
3214 actions. Signal numbers and signal names may be interspersed with
3215 actions, with the actions being performed for all signals cumulatively
3216 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3218 while (*argv
!= NULL
)
3220 wordlen
= strlen (*argv
);
3221 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3225 sigfirst
= siglast
= -1;
3227 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3229 /* Apply action to all signals except those used by the
3230 debugger. Silently skip those. */
3233 siglast
= nsigs
- 1;
3235 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3237 SET_SIGS (nsigs
, sigs
, signal_stop
);
3238 SET_SIGS (nsigs
, sigs
, signal_print
);
3240 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3242 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3244 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3246 SET_SIGS (nsigs
, sigs
, signal_print
);
3248 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3250 SET_SIGS (nsigs
, sigs
, signal_program
);
3252 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3254 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3256 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3258 SET_SIGS (nsigs
, sigs
, signal_program
);
3260 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3262 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3263 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3265 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3267 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3269 else if (digits
> 0)
3271 /* It is numeric. The numeric signal refers to our own
3272 internal signal numbering from target.h, not to host/target
3273 signal number. This is a feature; users really should be
3274 using symbolic names anyway, and the common ones like
3275 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3277 sigfirst
= siglast
= (int)
3278 target_signal_from_command (atoi (*argv
));
3279 if ((*argv
)[digits
] == '-')
3282 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3284 if (sigfirst
> siglast
)
3286 /* Bet he didn't figure we'd think of this case... */
3294 oursig
= target_signal_from_name (*argv
);
3295 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3297 sigfirst
= siglast
= (int) oursig
;
3301 /* Not a number and not a recognized flag word => complain. */
3302 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3306 /* If any signal numbers or symbol names were found, set flags for
3307 which signals to apply actions to. */
3309 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3311 switch ((enum target_signal
) signum
)
3313 case TARGET_SIGNAL_TRAP
:
3314 case TARGET_SIGNAL_INT
:
3315 if (!allsigs
&& !sigs
[signum
])
3317 if (query ("%s is used by the debugger.\n\
3318 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3324 printf_unfiltered ("Not confirmed, unchanged.\n");
3325 gdb_flush (gdb_stdout
);
3329 case TARGET_SIGNAL_0
:
3330 case TARGET_SIGNAL_DEFAULT
:
3331 case TARGET_SIGNAL_UNKNOWN
:
3332 /* Make sure that "all" doesn't print these. */
3343 target_notice_signals (inferior_ptid
);
3347 /* Show the results. */
3348 sig_print_header ();
3349 for (signum
= 0; signum
< nsigs
; signum
++)
3353 sig_print_info (signum
);
3358 do_cleanups (old_chain
);
3362 xdb_handle_command (char *args
, int from_tty
)
3365 struct cleanup
*old_chain
;
3367 /* Break the command line up into args. */
3369 argv
= buildargv (args
);
3374 old_chain
= make_cleanup_freeargv (argv
);
3375 if (argv
[1] != (char *) NULL
)
3380 bufLen
= strlen (argv
[0]) + 20;
3381 argBuf
= (char *) xmalloc (bufLen
);
3385 enum target_signal oursig
;
3387 oursig
= target_signal_from_name (argv
[0]);
3388 memset (argBuf
, 0, bufLen
);
3389 if (strcmp (argv
[1], "Q") == 0)
3390 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3393 if (strcmp (argv
[1], "s") == 0)
3395 if (!signal_stop
[oursig
])
3396 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3398 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3400 else if (strcmp (argv
[1], "i") == 0)
3402 if (!signal_program
[oursig
])
3403 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3405 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3407 else if (strcmp (argv
[1], "r") == 0)
3409 if (!signal_print
[oursig
])
3410 sprintf (argBuf
, "%s %s", argv
[0], "print");
3412 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3418 handle_command (argBuf
, from_tty
);
3420 printf_filtered ("Invalid signal handling flag.\n");
3425 do_cleanups (old_chain
);
3428 /* Print current contents of the tables set by the handle command.
3429 It is possible we should just be printing signals actually used
3430 by the current target (but for things to work right when switching
3431 targets, all signals should be in the signal tables). */
3434 signals_info (char *signum_exp
, int from_tty
)
3436 enum target_signal oursig
;
3437 sig_print_header ();
3441 /* First see if this is a symbol name. */
3442 oursig
= target_signal_from_name (signum_exp
);
3443 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3445 /* No, try numeric. */
3447 target_signal_from_command (parse_and_eval_long (signum_exp
));
3449 sig_print_info (oursig
);
3453 printf_filtered ("\n");
3454 /* These ugly casts brought to you by the native VAX compiler. */
3455 for (oursig
= TARGET_SIGNAL_FIRST
;
3456 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3457 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3461 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3462 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3463 sig_print_info (oursig
);
3466 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3469 struct inferior_status
3471 enum target_signal stop_signal
;
3475 int stop_stack_dummy
;
3476 int stopped_by_random_signal
;
3478 CORE_ADDR step_range_start
;
3479 CORE_ADDR step_range_end
;
3480 struct frame_id step_frame_id
;
3481 enum step_over_calls_kind step_over_calls
;
3482 CORE_ADDR step_resume_break_address
;
3483 int stop_after_trap
;
3484 int stop_soon_quietly
;
3485 struct regcache
*stop_registers
;
3487 /* These are here because if call_function_by_hand has written some
3488 registers and then decides to call error(), we better not have changed
3490 struct regcache
*registers
;
3492 /* A frame unique identifier. */
3493 struct frame_id selected_frame_id
;
3495 int breakpoint_proceeded
;
3496 int restore_stack_info
;
3497 int proceed_to_finish
;
3501 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3504 int size
= REGISTER_RAW_SIZE (regno
);
3505 void *buf
= alloca (size
);
3506 store_signed_integer (buf
, size
, val
);
3507 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3510 /* Save all of the information associated with the inferior<==>gdb
3511 connection. INF_STATUS is a pointer to a "struct inferior_status"
3512 (defined in inferior.h). */
3514 struct inferior_status
*
3515 save_inferior_status (int restore_stack_info
)
3517 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3519 inf_status
->stop_signal
= stop_signal
;
3520 inf_status
->stop_pc
= stop_pc
;
3521 inf_status
->stop_step
= stop_step
;
3522 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3523 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3524 inf_status
->trap_expected
= trap_expected
;
3525 inf_status
->step_range_start
= step_range_start
;
3526 inf_status
->step_range_end
= step_range_end
;
3527 inf_status
->step_frame_id
= step_frame_id
;
3528 inf_status
->step_over_calls
= step_over_calls
;
3529 inf_status
->stop_after_trap
= stop_after_trap
;
3530 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
3531 /* Save original bpstat chain here; replace it with copy of chain.
3532 If caller's caller is walking the chain, they'll be happier if we
3533 hand them back the original chain when restore_inferior_status is
3535 inf_status
->stop_bpstat
= stop_bpstat
;
3536 stop_bpstat
= bpstat_copy (stop_bpstat
);
3537 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3538 inf_status
->restore_stack_info
= restore_stack_info
;
3539 inf_status
->proceed_to_finish
= proceed_to_finish
;
3541 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3543 inf_status
->registers
= regcache_dup (current_regcache
);
3545 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3550 restore_selected_frame (void *args
)
3552 struct frame_id
*fid
= (struct frame_id
*) args
;
3553 struct frame_info
*frame
;
3555 frame
= frame_find_by_id (*fid
);
3557 /* If inf_status->selected_frame_id is NULL, there was no previously
3561 warning ("Unable to restore previously selected frame.\n");
3565 select_frame (frame
);
3571 restore_inferior_status (struct inferior_status
*inf_status
)
3573 stop_signal
= inf_status
->stop_signal
;
3574 stop_pc
= inf_status
->stop_pc
;
3575 stop_step
= inf_status
->stop_step
;
3576 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3577 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3578 trap_expected
= inf_status
->trap_expected
;
3579 step_range_start
= inf_status
->step_range_start
;
3580 step_range_end
= inf_status
->step_range_end
;
3581 step_frame_id
= inf_status
->step_frame_id
;
3582 step_over_calls
= inf_status
->step_over_calls
;
3583 stop_after_trap
= inf_status
->stop_after_trap
;
3584 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
3585 bpstat_clear (&stop_bpstat
);
3586 stop_bpstat
= inf_status
->stop_bpstat
;
3587 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3588 proceed_to_finish
= inf_status
->proceed_to_finish
;
3590 /* FIXME: Is the restore of stop_registers always needed. */
3591 regcache_xfree (stop_registers
);
3592 stop_registers
= inf_status
->stop_registers
;
3594 /* The inferior can be gone if the user types "print exit(0)"
3595 (and perhaps other times). */
3596 if (target_has_execution
)
3597 /* NB: The register write goes through to the target. */
3598 regcache_cpy (current_regcache
, inf_status
->registers
);
3599 regcache_xfree (inf_status
->registers
);
3601 /* FIXME: If we are being called after stopping in a function which
3602 is called from gdb, we should not be trying to restore the
3603 selected frame; it just prints a spurious error message (The
3604 message is useful, however, in detecting bugs in gdb (like if gdb
3605 clobbers the stack)). In fact, should we be restoring the
3606 inferior status at all in that case? . */
3608 if (target_has_stack
&& inf_status
->restore_stack_info
)
3610 /* The point of catch_errors is that if the stack is clobbered,
3611 walking the stack might encounter a garbage pointer and
3612 error() trying to dereference it. */
3614 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3615 "Unable to restore previously selected frame:\n",
3616 RETURN_MASK_ERROR
) == 0)
3617 /* Error in restoring the selected frame. Select the innermost
3619 select_frame (get_current_frame ());
3627 do_restore_inferior_status_cleanup (void *sts
)
3629 restore_inferior_status (sts
);
3633 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3635 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3639 discard_inferior_status (struct inferior_status
*inf_status
)
3641 /* See save_inferior_status for info on stop_bpstat. */
3642 bpstat_clear (&inf_status
->stop_bpstat
);
3643 regcache_xfree (inf_status
->registers
);
3644 regcache_xfree (inf_status
->stop_registers
);
3649 inferior_has_forked (int pid
, int *child_pid
)
3651 struct target_waitstatus last
;
3654 get_last_target_status (&last_ptid
, &last
);
3656 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3659 if (ptid_get_pid (last_ptid
) != pid
)
3662 *child_pid
= last
.value
.related_pid
;
3667 inferior_has_vforked (int pid
, int *child_pid
)
3669 struct target_waitstatus last
;
3672 get_last_target_status (&last_ptid
, &last
);
3674 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3677 if (ptid_get_pid (last_ptid
) != pid
)
3680 *child_pid
= last
.value
.related_pid
;
3685 inferior_has_execd (int pid
, char **execd_pathname
)
3687 struct target_waitstatus last
;
3690 get_last_target_status (&last_ptid
, &last
);
3692 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3695 if (ptid_get_pid (last_ptid
) != pid
)
3698 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3702 /* Oft used ptids */
3704 ptid_t minus_one_ptid
;
3706 /* Create a ptid given the necessary PID, LWP, and TID components. */
3709 ptid_build (int pid
, long lwp
, long tid
)
3719 /* Create a ptid from just a pid. */
3722 pid_to_ptid (int pid
)
3724 return ptid_build (pid
, 0, 0);
3727 /* Fetch the pid (process id) component from a ptid. */
3730 ptid_get_pid (ptid_t ptid
)
3735 /* Fetch the lwp (lightweight process) component from a ptid. */
3738 ptid_get_lwp (ptid_t ptid
)
3743 /* Fetch the tid (thread id) component from a ptid. */
3746 ptid_get_tid (ptid_t ptid
)
3751 /* ptid_equal() is used to test equality of two ptids. */
3754 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3756 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3757 && ptid1
.tid
== ptid2
.tid
);
3760 /* restore_inferior_ptid() will be used by the cleanup machinery
3761 to restore the inferior_ptid value saved in a call to
3762 save_inferior_ptid(). */
3765 restore_inferior_ptid (void *arg
)
3767 ptid_t
*saved_ptid_ptr
= arg
;
3768 inferior_ptid
= *saved_ptid_ptr
;
3772 /* Save the value of inferior_ptid so that it may be restored by a
3773 later call to do_cleanups(). Returns the struct cleanup pointer
3774 needed for later doing the cleanup. */
3777 save_inferior_ptid (void)
3779 ptid_t
*saved_ptid_ptr
;
3781 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3782 *saved_ptid_ptr
= inferior_ptid
;
3783 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3790 stop_registers
= regcache_xmalloc (current_gdbarch
);
3794 _initialize_infrun (void)
3797 register int numsigs
;
3798 struct cmd_list_element
*c
;
3800 register_gdbarch_swap (&stop_registers
, sizeof (stop_registers
), NULL
);
3801 register_gdbarch_swap (NULL
, 0, build_infrun
);
3803 add_info ("signals", signals_info
,
3804 "What debugger does when program gets various signals.\n\
3805 Specify a signal as argument to print info on that signal only.");
3806 add_info_alias ("handle", "signals", 0);
3808 add_com ("handle", class_run
, handle_command
,
3809 concat ("Specify how to handle a signal.\n\
3810 Args are signals and actions to apply to those signals.\n\
3811 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3812 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3813 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3814 The special arg \"all\" is recognized to mean all signals except those\n\
3815 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3816 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3817 Stop means reenter debugger if this signal happens (implies print).\n\
3818 Print means print a message if this signal happens.\n\
3819 Pass means let program see this signal; otherwise program doesn't know.\n\
3820 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3821 Pass and Stop may be combined.", NULL
));
3824 add_com ("lz", class_info
, signals_info
,
3825 "What debugger does when program gets various signals.\n\
3826 Specify a signal as argument to print info on that signal only.");
3827 add_com ("z", class_run
, xdb_handle_command
,
3828 concat ("Specify how to handle a signal.\n\
3829 Args are signals and actions to apply to those signals.\n\
3830 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3831 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3832 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3833 The special arg \"all\" is recognized to mean all signals except those\n\
3834 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3835 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3836 nopass), \"Q\" (noprint)\n\
3837 Stop means reenter debugger if this signal happens (implies print).\n\
3838 Print means print a message if this signal happens.\n\
3839 Pass means let program see this signal; otherwise program doesn't know.\n\
3840 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3841 Pass and Stop may be combined.", NULL
));
3846 add_cmd ("stop", class_obscure
, not_just_help_class_command
, "There is no `stop' command, but you can set a hook on `stop'.\n\
3847 This allows you to set a list of commands to be run each time execution\n\
3848 of the program stops.", &cmdlist
);
3850 numsigs
= (int) TARGET_SIGNAL_LAST
;
3851 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3852 signal_print
= (unsigned char *)
3853 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3854 signal_program
= (unsigned char *)
3855 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3856 for (i
= 0; i
< numsigs
; i
++)
3859 signal_print
[i
] = 1;
3860 signal_program
[i
] = 1;
3863 /* Signals caused by debugger's own actions
3864 should not be given to the program afterwards. */
3865 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3866 signal_program
[TARGET_SIGNAL_INT
] = 0;
3868 /* Signals that are not errors should not normally enter the debugger. */
3869 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3870 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3871 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3872 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3873 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3874 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3875 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3876 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3877 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3878 signal_print
[TARGET_SIGNAL_IO
] = 0;
3879 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3880 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3881 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3882 signal_print
[TARGET_SIGNAL_URG
] = 0;
3883 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
3884 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
3886 /* These signals are used internally by user-level thread
3887 implementations. (See signal(5) on Solaris.) Like the above
3888 signals, a healthy program receives and handles them as part of
3889 its normal operation. */
3890 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
3891 signal_print
[TARGET_SIGNAL_LWP
] = 0;
3892 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
3893 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
3894 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
3895 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
3899 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
3900 (char *) &stop_on_solib_events
,
3901 "Set stopping for shared library events.\n\
3902 If nonzero, gdb will give control to the user when the dynamic linker\n\
3903 notifies gdb of shared library events. The most common event of interest\n\
3904 to the user would be loading/unloading of a new library.\n", &setlist
), &showlist
);
3907 c
= add_set_enum_cmd ("follow-fork-mode",
3909 follow_fork_mode_kind_names
, &follow_fork_mode_string
,
3910 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
3911 kernel problem. It's also not terribly useful without a GUI to
3912 help the user drive two debuggers. So for now, I'm disabling
3913 the "both" option. */
3914 /* "Set debugger response to a program call of fork \
3916 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3917 parent - the original process is debugged after a fork\n\
3918 child - the new process is debugged after a fork\n\
3919 both - both the parent and child are debugged after a fork\n\
3920 ask - the debugger will ask for one of the above choices\n\
3921 For \"both\", another copy of the debugger will be started to follow\n\
3922 the new child process. The original debugger will continue to follow\n\
3923 the original parent process. To distinguish their prompts, the\n\
3924 debugger copy's prompt will be changed.\n\
3925 For \"parent\" or \"child\", the unfollowed process will run free.\n\
3926 By default, the debugger will follow the parent process.",
3928 "Set debugger response to a program call of fork \
3930 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3931 parent - the original process is debugged after a fork\n\
3932 child - the new process is debugged after a fork\n\
3933 ask - the debugger will ask for one of the above choices\n\
3934 For \"parent\" or \"child\", the unfollowed process will run free.\n\
3935 By default, the debugger will follow the parent process.", &setlist
);
3936 add_show_from_set (c
, &showlist
);
3938 c
= add_set_enum_cmd ("scheduler-locking", class_run
, scheduler_enums
, /* array of string names */
3939 &scheduler_mode
, /* current mode */
3940 "Set mode for locking scheduler during execution.\n\
3941 off == no locking (threads may preempt at any time)\n\
3942 on == full locking (no thread except the current thread may run)\n\
3943 step == scheduler locked during every single-step operation.\n\
3944 In this mode, no other thread may run during a step command.\n\
3945 Other threads may run while stepping over a function call ('next').", &setlist
);
3947 set_cmd_sfunc (c
, set_schedlock_func
); /* traps on target vector */
3948 add_show_from_set (c
, &showlist
);
3950 c
= add_set_cmd ("step-mode", class_run
,
3951 var_boolean
, (char *) &step_stop_if_no_debug
,
3952 "Set mode of the step operation. When set, doing a step over a\n\
3953 function without debug line information will stop at the first\n\
3954 instruction of that function. Otherwise, the function is skipped and\n\
3955 the step command stops at a different source line.", &setlist
);
3956 add_show_from_set (c
, &showlist
);
3958 /* ptid initializations */
3959 null_ptid
= ptid_build (0, 0, 0);
3960 minus_one_ptid
= ptid_build (-1, 0, 0);
3961 inferior_ptid
= null_ptid
;
3962 target_last_wait_ptid
= minus_one_ptid
;