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 int stepped_after_stopped_by_watchpoint
;
1157 int sw_single_step_trap_p
= 0;
1159 /* Cache the last pid/waitstatus. */
1160 target_last_wait_ptid
= ecs
->ptid
;
1161 target_last_waitstatus
= *ecs
->wp
;
1163 switch (ecs
->infwait_state
)
1165 case infwait_thread_hop_state
:
1166 /* Cancel the waiton_ptid. */
1167 ecs
->waiton_ptid
= pid_to_ptid (-1);
1168 /* Fall thru to the normal_state case. */
1170 case infwait_normal_state
:
1171 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1172 is serviced in this loop, below. */
1173 if (ecs
->enable_hw_watchpoints_after_wait
)
1175 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1176 ecs
->enable_hw_watchpoints_after_wait
= 0;
1178 stepped_after_stopped_by_watchpoint
= 0;
1181 case infwait_nullified_state
:
1184 case infwait_nonstep_watch_state
:
1185 insert_breakpoints ();
1187 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1188 handle things like signals arriving and other things happening
1189 in combination correctly? */
1190 stepped_after_stopped_by_watchpoint
= 1;
1193 ecs
->infwait_state
= infwait_normal_state
;
1195 flush_cached_frames ();
1197 /* If it's a new process, add it to the thread database */
1199 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1200 && !in_thread_list (ecs
->ptid
));
1202 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1203 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1205 add_thread (ecs
->ptid
);
1207 ui_out_text (uiout
, "[New ");
1208 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1209 ui_out_text (uiout
, "]\n");
1212 /* NOTE: This block is ONLY meant to be invoked in case of a
1213 "thread creation event"! If it is invoked for any other
1214 sort of event (such as a new thread landing on a breakpoint),
1215 the event will be discarded, which is almost certainly
1218 To avoid this, the low-level module (eg. target_wait)
1219 should call in_thread_list and add_thread, so that the
1220 new thread is known by the time we get here. */
1222 /* We may want to consider not doing a resume here in order
1223 to give the user a chance to play with the new thread.
1224 It might be good to make that a user-settable option. */
1226 /* At this point, all threads are stopped (happens
1227 automatically in either the OS or the native code).
1228 Therefore we need to continue all threads in order to
1231 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1232 prepare_to_wait (ecs
);
1237 switch (ecs
->ws
.kind
)
1239 case TARGET_WAITKIND_LOADED
:
1240 /* Ignore gracefully during startup of the inferior, as it
1241 might be the shell which has just loaded some objects,
1242 otherwise add the symbols for the newly loaded objects. */
1244 if (!stop_soon_quietly
)
1246 /* Remove breakpoints, SOLIB_ADD might adjust
1247 breakpoint addresses via breakpoint_re_set. */
1248 if (breakpoints_inserted
)
1249 remove_breakpoints ();
1251 /* Check for any newly added shared libraries if we're
1252 supposed to be adding them automatically. Switch
1253 terminal for any messages produced by
1254 breakpoint_re_set. */
1255 target_terminal_ours_for_output ();
1256 SOLIB_ADD (NULL
, 0, NULL
, auto_solib_add
);
1257 target_terminal_inferior ();
1259 /* Reinsert breakpoints and continue. */
1260 if (breakpoints_inserted
)
1261 insert_breakpoints ();
1264 resume (0, TARGET_SIGNAL_0
);
1265 prepare_to_wait (ecs
);
1268 case TARGET_WAITKIND_SPURIOUS
:
1269 resume (0, TARGET_SIGNAL_0
);
1270 prepare_to_wait (ecs
);
1273 case TARGET_WAITKIND_EXITED
:
1274 target_terminal_ours (); /* Must do this before mourn anyway */
1275 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1277 /* Record the exit code in the convenience variable $_exitcode, so
1278 that the user can inspect this again later. */
1279 set_internalvar (lookup_internalvar ("_exitcode"),
1280 value_from_longest (builtin_type_int
,
1281 (LONGEST
) ecs
->ws
.value
.integer
));
1282 gdb_flush (gdb_stdout
);
1283 target_mourn_inferior ();
1284 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1285 stop_print_frame
= 0;
1286 stop_stepping (ecs
);
1289 case TARGET_WAITKIND_SIGNALLED
:
1290 stop_print_frame
= 0;
1291 stop_signal
= ecs
->ws
.value
.sig
;
1292 target_terminal_ours (); /* Must do this before mourn anyway */
1294 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1295 reach here unless the inferior is dead. However, for years
1296 target_kill() was called here, which hints that fatal signals aren't
1297 really fatal on some systems. If that's true, then some changes
1299 target_mourn_inferior ();
1301 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1302 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1303 stop_stepping (ecs
);
1306 /* The following are the only cases in which we keep going;
1307 the above cases end in a continue or goto. */
1308 case TARGET_WAITKIND_FORKED
:
1309 case TARGET_WAITKIND_VFORKED
:
1310 stop_signal
= TARGET_SIGNAL_TRAP
;
1311 pending_follow
.kind
= ecs
->ws
.kind
;
1313 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1314 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1316 stop_pc
= read_pc ();
1318 /* Assume that catchpoints are not really software breakpoints. If
1319 some future target implements them using software breakpoints then
1320 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1321 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1322 bpstat_stop_status will not decrement the PC. */
1324 stop_bpstat
= bpstat_stop_status (&stop_pc
, 1);
1326 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1328 /* If no catchpoint triggered for this, then keep going. */
1329 if (ecs
->random_signal
)
1331 stop_signal
= TARGET_SIGNAL_0
;
1335 goto process_event_stop_test
;
1337 case TARGET_WAITKIND_EXECD
:
1338 stop_signal
= TARGET_SIGNAL_TRAP
;
1340 /* NOTE drow/2002-12-05: This code should be pushed down into the
1341 target_wait function. Until then following vfork on HP/UX 10.20
1342 is probably broken by this. Of course, it's broken anyway. */
1343 /* Is this a target which reports multiple exec events per actual
1344 call to exec()? (HP-UX using ptrace does, for example.) If so,
1345 ignore all but the last one. Just resume the exec'r, and wait
1346 for the next exec event. */
1347 if (inferior_ignoring_leading_exec_events
)
1349 inferior_ignoring_leading_exec_events
--;
1350 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1351 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1353 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1354 prepare_to_wait (ecs
);
1357 inferior_ignoring_leading_exec_events
=
1358 target_reported_exec_events_per_exec_call () - 1;
1360 pending_follow
.execd_pathname
=
1361 savestring (ecs
->ws
.value
.execd_pathname
,
1362 strlen (ecs
->ws
.value
.execd_pathname
));
1364 /* This causes the eventpoints and symbol table to be reset. Must
1365 do this now, before trying to determine whether to stop. */
1366 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1367 xfree (pending_follow
.execd_pathname
);
1369 stop_pc
= read_pc_pid (ecs
->ptid
);
1370 ecs
->saved_inferior_ptid
= inferior_ptid
;
1371 inferior_ptid
= ecs
->ptid
;
1373 /* Assume that catchpoints are not really software breakpoints. If
1374 some future target implements them using software breakpoints then
1375 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1376 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1377 bpstat_stop_status will not decrement the PC. */
1379 stop_bpstat
= bpstat_stop_status (&stop_pc
, 1);
1381 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1382 inferior_ptid
= ecs
->saved_inferior_ptid
;
1384 /* If no catchpoint triggered for this, then keep going. */
1385 if (ecs
->random_signal
)
1387 stop_signal
= TARGET_SIGNAL_0
;
1391 goto process_event_stop_test
;
1393 /* These syscall events are returned on HP-UX, as part of its
1394 implementation of page-protection-based "hardware" watchpoints.
1395 HP-UX has unfortunate interactions between page-protections and
1396 some system calls. Our solution is to disable hardware watches
1397 when a system call is entered, and reenable them when the syscall
1398 completes. The downside of this is that we may miss the precise
1399 point at which a watched piece of memory is modified. "Oh well."
1401 Note that we may have multiple threads running, which may each
1402 enter syscalls at roughly the same time. Since we don't have a
1403 good notion currently of whether a watched piece of memory is
1404 thread-private, we'd best not have any page-protections active
1405 when any thread is in a syscall. Thus, we only want to reenable
1406 hardware watches when no threads are in a syscall.
1408 Also, be careful not to try to gather much state about a thread
1409 that's in a syscall. It's frequently a losing proposition. */
1410 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1411 number_of_threads_in_syscalls
++;
1412 if (number_of_threads_in_syscalls
== 1)
1414 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1416 resume (0, TARGET_SIGNAL_0
);
1417 prepare_to_wait (ecs
);
1420 /* Before examining the threads further, step this thread to
1421 get it entirely out of the syscall. (We get notice of the
1422 event when the thread is just on the verge of exiting a
1423 syscall. Stepping one instruction seems to get it back
1426 Note that although the logical place to reenable h/w watches
1427 is here, we cannot. We cannot reenable them before stepping
1428 the thread (this causes the next wait on the thread to hang).
1430 Nor can we enable them after stepping until we've done a wait.
1431 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1432 here, which will be serviced immediately after the target
1434 case TARGET_WAITKIND_SYSCALL_RETURN
:
1435 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1437 if (number_of_threads_in_syscalls
> 0)
1439 number_of_threads_in_syscalls
--;
1440 ecs
->enable_hw_watchpoints_after_wait
=
1441 (number_of_threads_in_syscalls
== 0);
1443 prepare_to_wait (ecs
);
1446 case TARGET_WAITKIND_STOPPED
:
1447 stop_signal
= ecs
->ws
.value
.sig
;
1450 /* We had an event in the inferior, but we are not interested
1451 in handling it at this level. The lower layers have already
1452 done what needs to be done, if anything.
1454 One of the possible circumstances for this is when the
1455 inferior produces output for the console. The inferior has
1456 not stopped, and we are ignoring the event. Another possible
1457 circumstance is any event which the lower level knows will be
1458 reported multiple times without an intervening resume. */
1459 case TARGET_WAITKIND_IGNORE
:
1460 prepare_to_wait (ecs
);
1464 /* We may want to consider not doing a resume here in order to give
1465 the user a chance to play with the new thread. It might be good
1466 to make that a user-settable option. */
1468 /* At this point, all threads are stopped (happens automatically in
1469 either the OS or the native code). Therefore we need to continue
1470 all threads in order to make progress. */
1471 if (ecs
->new_thread_event
)
1473 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1474 prepare_to_wait (ecs
);
1478 stop_pc
= read_pc_pid (ecs
->ptid
);
1480 /* See if a thread hit a thread-specific breakpoint that was meant for
1481 another thread. If so, then step that thread past the breakpoint,
1484 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1486 /* Check if a regular breakpoint has been hit before checking
1487 for a potential single step breakpoint. Otherwise, GDB will
1488 not see this breakpoint hit when stepping onto breakpoints. */
1489 if (breakpoints_inserted
1490 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
1492 ecs
->random_signal
= 0;
1493 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
,
1498 /* Saw a breakpoint, but it was hit by the wrong thread.
1500 if (DECR_PC_AFTER_BREAK
)
1501 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
, ecs
->ptid
);
1503 remove_status
= remove_breakpoints ();
1504 /* Did we fail to remove breakpoints? If so, try
1505 to set the PC past the bp. (There's at least
1506 one situation in which we can fail to remove
1507 the bp's: On HP-UX's that use ttrace, we can't
1508 change the address space of a vforking child
1509 process until the child exits (well, okay, not
1510 then either :-) or execs. */
1511 if (remove_status
!= 0)
1513 /* FIXME! This is obviously non-portable! */
1514 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
+ 4, ecs
->ptid
);
1515 /* We need to restart all the threads now,
1516 * unles we're running in scheduler-locked mode.
1517 * Use currently_stepping to determine whether to
1520 /* FIXME MVS: is there any reason not to call resume()? */
1521 if (scheduler_mode
== schedlock_on
)
1522 target_resume (ecs
->ptid
,
1523 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1525 target_resume (RESUME_ALL
,
1526 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1527 prepare_to_wait (ecs
);
1532 breakpoints_inserted
= 0;
1533 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1534 context_switch (ecs
);
1535 ecs
->waiton_ptid
= ecs
->ptid
;
1536 ecs
->wp
= &(ecs
->ws
);
1537 ecs
->another_trap
= 1;
1539 ecs
->infwait_state
= infwait_thread_hop_state
;
1541 registers_changed ();
1546 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1548 /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK
1549 compared to the value it would have if the system stepping
1550 capability was used. This allows the rest of the code in
1551 this function to use this address without having to worry
1552 whether software single step is in use or not. */
1553 if (DECR_PC_AFTER_BREAK
)
1555 stop_pc
-= DECR_PC_AFTER_BREAK
;
1556 write_pc_pid (stop_pc
, ecs
->ptid
);
1559 sw_single_step_trap_p
= 1;
1560 ecs
->random_signal
= 0;
1564 ecs
->random_signal
= 1;
1566 /* See if something interesting happened to the non-current thread. If
1567 so, then switch to that thread, and eventually give control back to
1570 Note that if there's any kind of pending follow (i.e., of a fork,
1571 vfork or exec), we don't want to do this now. Rather, we'll let
1572 the next resume handle it. */
1573 if (!ptid_equal (ecs
->ptid
, inferior_ptid
) &&
1574 (pending_follow
.kind
== TARGET_WAITKIND_SPURIOUS
))
1578 /* If it's a random signal for a non-current thread, notify user
1579 if he's expressed an interest. */
1580 if (ecs
->random_signal
&& signal_print
[stop_signal
])
1582 /* ??rehrauer: I don't understand the rationale for this code. If the
1583 inferior will stop as a result of this signal, then the act of handling
1584 the stop ought to print a message that's couches the stoppage in user
1585 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1586 won't stop as a result of the signal -- i.e., if the signal is merely
1587 a side-effect of something GDB's doing "under the covers" for the
1588 user, such as stepping threads over a breakpoint they shouldn't stop
1589 for -- then the message seems to be a serious annoyance at best.
1591 For now, remove the message altogether. */
1594 target_terminal_ours_for_output ();
1595 printf_filtered ("\nProgram received signal %s, %s.\n",
1596 target_signal_to_name (stop_signal
),
1597 target_signal_to_string (stop_signal
));
1598 gdb_flush (gdb_stdout
);
1602 /* If it's not SIGTRAP and not a signal we want to stop for, then
1603 continue the thread. */
1605 if (stop_signal
!= TARGET_SIGNAL_TRAP
&& !signal_stop
[stop_signal
])
1608 target_terminal_inferior ();
1610 /* Clear the signal if it should not be passed. */
1611 if (signal_program
[stop_signal
] == 0)
1612 stop_signal
= TARGET_SIGNAL_0
;
1614 target_resume (ecs
->ptid
, 0, stop_signal
);
1615 prepare_to_wait (ecs
);
1619 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1620 and fall into the rest of wait_for_inferior(). */
1622 context_switch (ecs
);
1625 context_hook (pid_to_thread_id (ecs
->ptid
));
1627 flush_cached_frames ();
1630 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1632 /* Pull the single step breakpoints out of the target. */
1633 SOFTWARE_SINGLE_STEP (0, 0);
1634 singlestep_breakpoints_inserted_p
= 0;
1637 /* If PC is pointing at a nullified instruction, then step beyond
1638 it so that the user won't be confused when GDB appears to be ready
1641 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1642 if (INSTRUCTION_NULLIFIED
)
1644 registers_changed ();
1645 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1647 /* We may have received a signal that we want to pass to
1648 the inferior; therefore, we must not clobber the waitstatus
1651 ecs
->infwait_state
= infwait_nullified_state
;
1652 ecs
->waiton_ptid
= ecs
->ptid
;
1653 ecs
->wp
= &(ecs
->tmpstatus
);
1654 prepare_to_wait (ecs
);
1658 /* It may not be necessary to disable the watchpoint to stop over
1659 it. For example, the PA can (with some kernel cooperation)
1660 single step over a watchpoint without disabling the watchpoint. */
1661 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1664 prepare_to_wait (ecs
);
1668 /* It is far more common to need to disable a watchpoint to step
1669 the inferior over it. FIXME. What else might a debug
1670 register or page protection watchpoint scheme need here? */
1671 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1673 /* At this point, we are stopped at an instruction which has
1674 attempted to write to a piece of memory under control of
1675 a watchpoint. The instruction hasn't actually executed
1676 yet. If we were to evaluate the watchpoint expression
1677 now, we would get the old value, and therefore no change
1678 would seem to have occurred.
1680 In order to make watchpoints work `right', we really need
1681 to complete the memory write, and then evaluate the
1682 watchpoint expression. The following code does that by
1683 removing the watchpoint (actually, all watchpoints and
1684 breakpoints), single-stepping the target, re-inserting
1685 watchpoints, and then falling through to let normal
1686 single-step processing handle proceed. Since this
1687 includes evaluating watchpoints, things will come to a
1688 stop in the correct manner. */
1690 if (DECR_PC_AFTER_BREAK
)
1691 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
1693 remove_breakpoints ();
1694 registers_changed ();
1695 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1697 ecs
->waiton_ptid
= ecs
->ptid
;
1698 ecs
->wp
= &(ecs
->ws
);
1699 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1700 prepare_to_wait (ecs
);
1704 /* It may be possible to simply continue after a watchpoint. */
1705 if (HAVE_CONTINUABLE_WATCHPOINT
)
1706 STOPPED_BY_WATCHPOINT (ecs
->ws
);
1708 ecs
->stop_func_start
= 0;
1709 ecs
->stop_func_end
= 0;
1710 ecs
->stop_func_name
= 0;
1711 /* Don't care about return value; stop_func_start and stop_func_name
1712 will both be 0 if it doesn't work. */
1713 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1714 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1715 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
1716 ecs
->another_trap
= 0;
1717 bpstat_clear (&stop_bpstat
);
1719 stop_stack_dummy
= 0;
1720 stop_print_frame
= 1;
1721 ecs
->random_signal
= 0;
1722 stopped_by_random_signal
= 0;
1723 breakpoints_failed
= 0;
1725 /* Look at the cause of the stop, and decide what to do.
1726 The alternatives are:
1727 1) break; to really stop and return to the debugger,
1728 2) drop through to start up again
1729 (set ecs->another_trap to 1 to single step once)
1730 3) set ecs->random_signal to 1, and the decision between 1 and 2
1731 will be made according to the signal handling tables. */
1733 /* First, distinguish signals caused by the debugger from signals
1734 that have to do with the program's own actions.
1735 Note that breakpoint insns may cause SIGTRAP or SIGILL
1736 or SIGEMT, depending on the operating system version.
1737 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1738 and change it to SIGTRAP. */
1740 if (stop_signal
== TARGET_SIGNAL_TRAP
1741 || (breakpoints_inserted
&&
1742 (stop_signal
== TARGET_SIGNAL_ILL
1743 || stop_signal
== TARGET_SIGNAL_EMT
)) || stop_soon_quietly
)
1745 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1747 stop_print_frame
= 0;
1748 stop_stepping (ecs
);
1751 if (stop_soon_quietly
)
1753 stop_stepping (ecs
);
1757 /* Don't even think about breakpoints
1758 if just proceeded over a breakpoint.
1760 However, if we are trying to proceed over a breakpoint
1761 and end up in sigtramp, then through_sigtramp_breakpoint
1762 will be set and we should check whether we've hit the
1764 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
1765 && through_sigtramp_breakpoint
== NULL
)
1766 bpstat_clear (&stop_bpstat
);
1769 /* See if there is a breakpoint at the current PC. */
1771 /* The second argument of bpstat_stop_status is meant to help
1772 distinguish between a breakpoint trap and a singlestep trap.
1773 This is only important on targets where DECR_PC_AFTER_BREAK
1774 is non-zero. The prev_pc test is meant to distinguish between
1775 singlestepping a trap instruction, and singlestepping thru a
1776 jump to the instruction following a trap instruction.
1778 Therefore, pass TRUE if our reason for stopping is
1779 something other than hitting a breakpoint. We do this by
1780 checking that either: we detected earlier a software single
1781 step trap or, 1) stepping is going on and 2) we didn't hit
1782 a breakpoint in a signal handler without an intervening stop
1783 in sigtramp, which is detected by a new stack pointer value
1784 below any usual function calling stack adjustments. */
1788 sw_single_step_trap_p
1789 || (currently_stepping (ecs
)
1790 && prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
1792 && INNER_THAN (read_sp (), (step_sp
- 16)))));
1793 /* Following in case break condition called a
1795 stop_print_frame
= 1;
1798 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1800 = !(bpstat_explains_signal (stop_bpstat
)
1802 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
1803 && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
1804 get_frame_base (get_current_frame ())))
1805 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1809 ecs
->random_signal
= !(bpstat_explains_signal (stop_bpstat
)
1810 /* End of a stack dummy. Some systems (e.g. Sony
1811 news) give another signal besides SIGTRAP, so
1812 check here as well as above. */
1813 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
1814 && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
1818 if (!ecs
->random_signal
)
1819 stop_signal
= TARGET_SIGNAL_TRAP
;
1823 /* When we reach this point, we've pretty much decided
1824 that the reason for stopping must've been a random
1825 (unexpected) signal. */
1828 ecs
->random_signal
= 1;
1830 process_event_stop_test
:
1831 /* For the program's own signals, act according to
1832 the signal handling tables. */
1834 if (ecs
->random_signal
)
1836 /* Signal not for debugging purposes. */
1839 stopped_by_random_signal
= 1;
1841 if (signal_print
[stop_signal
])
1844 target_terminal_ours_for_output ();
1845 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1847 if (signal_stop
[stop_signal
])
1849 stop_stepping (ecs
);
1852 /* If not going to stop, give terminal back
1853 if we took it away. */
1855 target_terminal_inferior ();
1857 /* Clear the signal if it should not be passed. */
1858 if (signal_program
[stop_signal
] == 0)
1859 stop_signal
= TARGET_SIGNAL_0
;
1861 /* I'm not sure whether this needs to be check_sigtramp2 or
1862 whether it could/should be keep_going.
1864 This used to jump to step_over_function if we are stepping,
1867 Suppose the user does a `next' over a function call, and while
1868 that call is in progress, the inferior receives a signal for
1869 which GDB does not stop (i.e., signal_stop[SIG] is false). In
1870 that case, when we reach this point, there is already a
1871 step-resume breakpoint established, right where it should be:
1872 immediately after the function call the user is "next"-ing
1873 over. If we call step_over_function now, two bad things
1876 - we'll create a new breakpoint, at wherever the current
1877 frame's return address happens to be. That could be
1878 anywhere, depending on what function call happens to be on
1879 the top of the stack at that point. Point is, it's probably
1880 not where we need it.
1882 - the existing step-resume breakpoint (which is at the correct
1883 address) will get orphaned: step_resume_breakpoint will point
1884 to the new breakpoint, and the old step-resume breakpoint
1885 will never be cleaned up.
1887 The old behavior was meant to help HP-UX single-step out of
1888 sigtramps. It would place the new breakpoint at prev_pc, which
1889 was certainly wrong. I don't know the details there, so fixing
1890 this probably breaks that. As with anything else, it's up to
1891 the HP-UX maintainer to furnish a fix that doesn't break other
1892 platforms. --JimB, 20 May 1999 */
1893 check_sigtramp2 (ecs
);
1898 /* Handle cases caused by hitting a breakpoint. */
1900 CORE_ADDR jmp_buf_pc
;
1901 struct bpstat_what what
;
1903 what
= bpstat_what (stop_bpstat
);
1905 if (what
.call_dummy
)
1907 stop_stack_dummy
= 1;
1909 trap_expected_after_continue
= 1;
1913 switch (what
.main_action
)
1915 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
1916 /* If we hit the breakpoint at longjmp, disable it for the
1917 duration of this command. Then, install a temporary
1918 breakpoint at the target of the jmp_buf. */
1919 disable_longjmp_breakpoint ();
1920 remove_breakpoints ();
1921 breakpoints_inserted
= 0;
1922 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
1928 /* Need to blow away step-resume breakpoint, as it
1929 interferes with us */
1930 if (step_resume_breakpoint
!= NULL
)
1932 delete_step_resume_breakpoint (&step_resume_breakpoint
);
1934 /* Not sure whether we need to blow this away too, but probably
1935 it is like the step-resume breakpoint. */
1936 if (through_sigtramp_breakpoint
!= NULL
)
1938 delete_breakpoint (through_sigtramp_breakpoint
);
1939 through_sigtramp_breakpoint
= NULL
;
1943 /* FIXME - Need to implement nested temporary breakpoints */
1944 if (step_over_calls
> 0)
1945 set_longjmp_resume_breakpoint (jmp_buf_pc
, get_current_frame ());
1948 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
1949 ecs
->handling_longjmp
= 1; /* FIXME */
1953 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
1954 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
1955 remove_breakpoints ();
1956 breakpoints_inserted
= 0;
1958 /* FIXME - Need to implement nested temporary breakpoints */
1960 && (frame_id_inner (get_frame_id (get_current_frame ()),
1963 ecs
->another_trap
= 1;
1968 disable_longjmp_breakpoint ();
1969 ecs
->handling_longjmp
= 0; /* FIXME */
1970 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
1972 /* else fallthrough */
1974 case BPSTAT_WHAT_SINGLE
:
1975 if (breakpoints_inserted
)
1977 remove_breakpoints ();
1979 breakpoints_inserted
= 0;
1980 ecs
->another_trap
= 1;
1981 /* Still need to check other stuff, at least the case
1982 where we are stepping and step out of the right range. */
1985 case BPSTAT_WHAT_STOP_NOISY
:
1986 stop_print_frame
= 1;
1988 /* We are about to nuke the step_resume_breakpoint and
1989 through_sigtramp_breakpoint via the cleanup chain, so
1990 no need to worry about it here. */
1992 stop_stepping (ecs
);
1995 case BPSTAT_WHAT_STOP_SILENT
:
1996 stop_print_frame
= 0;
1998 /* We are about to nuke the step_resume_breakpoint and
1999 through_sigtramp_breakpoint via the cleanup chain, so
2000 no need to worry about it here. */
2002 stop_stepping (ecs
);
2005 case BPSTAT_WHAT_STEP_RESUME
:
2006 /* This proably demands a more elegant solution, but, yeah
2009 This function's use of the simple variable
2010 step_resume_breakpoint doesn't seem to accomodate
2011 simultaneously active step-resume bp's, although the
2012 breakpoint list certainly can.
2014 If we reach here and step_resume_breakpoint is already
2015 NULL, then apparently we have multiple active
2016 step-resume bp's. We'll just delete the breakpoint we
2017 stopped at, and carry on.
2019 Correction: what the code currently does is delete a
2020 step-resume bp, but it makes no effort to ensure that
2021 the one deleted is the one currently stopped at. MVS */
2023 if (step_resume_breakpoint
== NULL
)
2025 step_resume_breakpoint
=
2026 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2028 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2031 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2032 if (through_sigtramp_breakpoint
)
2033 delete_breakpoint (through_sigtramp_breakpoint
);
2034 through_sigtramp_breakpoint
= NULL
;
2036 /* If were waiting for a trap, hitting the step_resume_break
2037 doesn't count as getting it. */
2039 ecs
->another_trap
= 1;
2042 case BPSTAT_WHAT_CHECK_SHLIBS
:
2043 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2046 /* Remove breakpoints, we eventually want to step over the
2047 shlib event breakpoint, and SOLIB_ADD might adjust
2048 breakpoint addresses via breakpoint_re_set. */
2049 if (breakpoints_inserted
)
2050 remove_breakpoints ();
2051 breakpoints_inserted
= 0;
2053 /* Check for any newly added shared libraries if we're
2054 supposed to be adding them automatically. Switch
2055 terminal for any messages produced by
2056 breakpoint_re_set. */
2057 target_terminal_ours_for_output ();
2058 SOLIB_ADD (NULL
, 0, NULL
, auto_solib_add
);
2059 target_terminal_inferior ();
2061 /* Try to reenable shared library breakpoints, additional
2062 code segments in shared libraries might be mapped in now. */
2063 re_enable_breakpoints_in_shlibs ();
2065 /* If requested, stop when the dynamic linker notifies
2066 gdb of events. This allows the user to get control
2067 and place breakpoints in initializer routines for
2068 dynamically loaded objects (among other things). */
2069 if (stop_on_solib_events
)
2071 stop_stepping (ecs
);
2075 /* If we stopped due to an explicit catchpoint, then the
2076 (see above) call to SOLIB_ADD pulled in any symbols
2077 from a newly-loaded library, if appropriate.
2079 We do want the inferior to stop, but not where it is
2080 now, which is in the dynamic linker callback. Rather,
2081 we would like it stop in the user's program, just after
2082 the call that caused this catchpoint to trigger. That
2083 gives the user a more useful vantage from which to
2084 examine their program's state. */
2085 else if (what
.main_action
==
2086 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2088 /* ??rehrauer: If I could figure out how to get the
2089 right return PC from here, we could just set a temp
2090 breakpoint and resume. I'm not sure we can without
2091 cracking open the dld's shared libraries and sniffing
2092 their unwind tables and text/data ranges, and that's
2093 not a terribly portable notion.
2095 Until that time, we must step the inferior out of the
2096 dld callback, and also out of the dld itself (and any
2097 code or stubs in libdld.sl, such as "shl_load" and
2098 friends) until we reach non-dld code. At that point,
2099 we can stop stepping. */
2100 bpstat_get_triggered_catchpoints (stop_bpstat
,
2102 stepping_through_solib_catchpoints
);
2103 ecs
->stepping_through_solib_after_catch
= 1;
2105 /* Be sure to lift all breakpoints, so the inferior does
2106 actually step past this point... */
2107 ecs
->another_trap
= 1;
2112 /* We want to step over this breakpoint, then keep going. */
2113 ecs
->another_trap
= 1;
2120 case BPSTAT_WHAT_LAST
:
2121 /* Not a real code, but listed here to shut up gcc -Wall. */
2123 case BPSTAT_WHAT_KEEP_CHECKING
:
2128 /* We come here if we hit a breakpoint but should not
2129 stop for it. Possibly we also were stepping
2130 and should stop for that. So fall through and
2131 test for stepping. But, if not stepping,
2134 /* Are we stepping to get the inferior out of the dynamic
2135 linker's hook (and possibly the dld itself) after catching
2137 if (ecs
->stepping_through_solib_after_catch
)
2139 #if defined(SOLIB_ADD)
2140 /* Have we reached our destination? If not, keep going. */
2141 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2143 ecs
->another_trap
= 1;
2148 /* Else, stop and report the catchpoint(s) whose triggering
2149 caused us to begin stepping. */
2150 ecs
->stepping_through_solib_after_catch
= 0;
2151 bpstat_clear (&stop_bpstat
);
2152 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2153 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2154 stop_print_frame
= 1;
2155 stop_stepping (ecs
);
2159 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P
)
2161 /* This is the old way of detecting the end of the stack dummy.
2162 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2163 handled above. As soon as we can test it on all of them, all
2164 architectures should define it. */
2166 /* If this is the breakpoint at the end of a stack dummy,
2167 just stop silently, unless the user was doing an si/ni, in which
2168 case she'd better know what she's doing. */
2170 if (CALL_DUMMY_HAS_COMPLETED (stop_pc
, read_sp (),
2171 get_frame_base (get_current_frame ()))
2174 stop_print_frame
= 0;
2175 stop_stack_dummy
= 1;
2177 trap_expected_after_continue
= 1;
2179 stop_stepping (ecs
);
2184 if (step_resume_breakpoint
)
2186 /* Having a step-resume breakpoint overrides anything
2187 else having to do with stepping commands until
2188 that breakpoint is reached. */
2189 /* I'm not sure whether this needs to be check_sigtramp2 or
2190 whether it could/should be keep_going. */
2191 check_sigtramp2 (ecs
);
2196 if (step_range_end
== 0)
2198 /* Likewise if we aren't even stepping. */
2199 /* I'm not sure whether this needs to be check_sigtramp2 or
2200 whether it could/should be keep_going. */
2201 check_sigtramp2 (ecs
);
2206 /* If stepping through a line, keep going if still within it.
2208 Note that step_range_end is the address of the first instruction
2209 beyond the step range, and NOT the address of the last instruction
2211 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2213 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2214 So definately need to check for sigtramp here. */
2215 check_sigtramp2 (ecs
);
2220 /* We stepped out of the stepping range. */
2222 /* If we are stepping at the source level and entered the runtime
2223 loader dynamic symbol resolution code, we keep on single stepping
2224 until we exit the run time loader code and reach the callee's
2226 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2227 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2229 CORE_ADDR pc_after_resolver
= SKIP_SOLIB_RESOLVER (stop_pc
);
2231 if (pc_after_resolver
)
2233 /* Set up a step-resume breakpoint at the address
2234 indicated by SKIP_SOLIB_RESOLVER. */
2235 struct symtab_and_line sr_sal
;
2237 sr_sal
.pc
= pc_after_resolver
;
2239 check_for_old_step_resume_breakpoint ();
2240 step_resume_breakpoint
=
2241 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2242 if (breakpoints_inserted
)
2243 insert_breakpoints ();
2250 /* We can't update step_sp every time through the loop, because
2251 reading the stack pointer would slow down stepping too much.
2252 But we can update it every time we leave the step range. */
2253 ecs
->update_step_sp
= 1;
2255 /* Did we just take a signal? */
2256 if (PC_IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2257 && !PC_IN_SIGTRAMP (prev_pc
, prev_func_name
)
2258 && INNER_THAN (read_sp (), step_sp
))
2260 /* We've just taken a signal; go until we are back to
2261 the point where we took it and one more. */
2263 /* Note: The test above succeeds not only when we stepped
2264 into a signal handler, but also when we step past the last
2265 statement of a signal handler and end up in the return stub
2266 of the signal handler trampoline. To distinguish between
2267 these two cases, check that the frame is INNER_THAN the
2268 previous one below. pai/1997-09-11 */
2272 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2274 if (frame_id_inner (current_frame
, step_frame_id
))
2276 /* We have just taken a signal; go until we are back to
2277 the point where we took it and one more. */
2279 /* This code is needed at least in the following case:
2280 The user types "next" and then a signal arrives (before
2281 the "next" is done). */
2283 /* Note that if we are stopped at a breakpoint, then we need
2284 the step_resume breakpoint to override any breakpoints at
2285 the same location, so that we will still step over the
2286 breakpoint even though the signal happened. */
2287 struct symtab_and_line sr_sal
;
2290 sr_sal
.symtab
= NULL
;
2292 sr_sal
.pc
= prev_pc
;
2293 /* We could probably be setting the frame to
2294 step_frame_id; I don't think anyone thought to try it. */
2295 check_for_old_step_resume_breakpoint ();
2296 step_resume_breakpoint
=
2297 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2298 if (breakpoints_inserted
)
2299 insert_breakpoints ();
2303 /* We just stepped out of a signal handler and into
2304 its calling trampoline.
2306 Normally, we'd call step_over_function from
2307 here, but for some reason GDB can't unwind the
2308 stack correctly to find the real PC for the point
2309 user code where the signal trampoline will return
2310 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2311 But signal trampolines are pretty small stubs of
2312 code, anyway, so it's OK instead to just
2313 single-step out. Note: assuming such trampolines
2314 don't exhibit recursion on any platform... */
2315 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2316 &ecs
->stop_func_start
,
2317 &ecs
->stop_func_end
);
2318 /* Readjust stepping range */
2319 step_range_start
= ecs
->stop_func_start
;
2320 step_range_end
= ecs
->stop_func_end
;
2321 ecs
->stepping_through_sigtramp
= 1;
2326 /* If this is stepi or nexti, make sure that the stepping range
2327 gets us past that instruction. */
2328 if (step_range_end
== 1)
2329 /* FIXME: Does this run afoul of the code below which, if
2330 we step into the middle of a line, resets the stepping
2332 step_range_end
= (step_range_start
= prev_pc
) + 1;
2334 ecs
->remove_breakpoints_on_following_step
= 1;
2339 if (stop_pc
== ecs
->stop_func_start
/* Quick test */
2340 || (in_prologue (stop_pc
, ecs
->stop_func_start
) &&
2341 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2342 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
)
2343 || ecs
->stop_func_name
== 0)
2345 /* It's a subroutine call. */
2347 if ((step_over_calls
== STEP_OVER_NONE
)
2348 || ((step_range_end
== 1)
2349 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2351 /* I presume that step_over_calls is only 0 when we're
2352 supposed to be stepping at the assembly language level
2353 ("stepi"). Just stop. */
2354 /* Also, maybe we just did a "nexti" inside a prolog,
2355 so we thought it was a subroutine call but it was not.
2356 Stop as well. FENN */
2358 print_stop_reason (END_STEPPING_RANGE
, 0);
2359 stop_stepping (ecs
);
2363 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
2365 /* We're doing a "next". */
2367 if (PC_IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2368 && frame_id_inner (step_frame_id
,
2369 frame_id_build (read_sp (), 0)))
2370 /* We stepped out of a signal handler, and into its
2371 calling trampoline. This is misdetected as a
2372 subroutine call, but stepping over the signal
2373 trampoline isn't such a bad idea. In order to do that,
2374 we have to ignore the value in step_frame_id, since
2375 that doesn't represent the frame that'll reach when we
2376 return from the signal trampoline. Otherwise we'll
2377 probably continue to the end of the program. */
2378 step_frame_id
= null_frame_id
;
2380 step_over_function (ecs
);
2385 /* If we are in a function call trampoline (a stub between
2386 the calling routine and the real function), locate the real
2387 function. That's what tells us (a) whether we want to step
2388 into it at all, and (b) what prologue we want to run to
2389 the end of, if we do step into it. */
2390 real_stop_pc
= skip_language_trampoline (stop_pc
);
2391 if (real_stop_pc
== 0)
2392 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2393 if (real_stop_pc
!= 0)
2394 ecs
->stop_func_start
= real_stop_pc
;
2396 /* If we have line number information for the function we
2397 are thinking of stepping into, step into it.
2399 If there are several symtabs at that PC (e.g. with include
2400 files), just want to know whether *any* of them have line
2401 numbers. find_pc_line handles this. */
2403 struct symtab_and_line tmp_sal
;
2405 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2406 if (tmp_sal
.line
!= 0)
2408 step_into_function (ecs
);
2413 /* If we have no line number and the step-stop-if-no-debug
2414 is set, we stop the step so that the user has a chance to
2415 switch in assembly mode. */
2416 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2419 print_stop_reason (END_STEPPING_RANGE
, 0);
2420 stop_stepping (ecs
);
2424 step_over_function (ecs
);
2430 /* We've wandered out of the step range. */
2432 ecs
->sal
= find_pc_line (stop_pc
, 0);
2434 if (step_range_end
== 1)
2436 /* It is stepi or nexti. We always want to stop stepping after
2439 print_stop_reason (END_STEPPING_RANGE
, 0);
2440 stop_stepping (ecs
);
2444 /* If we're in the return path from a shared library trampoline,
2445 we want to proceed through the trampoline when stepping. */
2446 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2448 /* Determine where this trampoline returns. */
2449 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2451 /* Only proceed through if we know where it's going. */
2454 /* And put the step-breakpoint there and go until there. */
2455 struct symtab_and_line sr_sal
;
2457 init_sal (&sr_sal
); /* initialize to zeroes */
2458 sr_sal
.pc
= real_stop_pc
;
2459 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2460 /* Do not specify what the fp should be when we stop
2461 since on some machines the prologue
2462 is where the new fp value is established. */
2463 check_for_old_step_resume_breakpoint ();
2464 step_resume_breakpoint
=
2465 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2466 if (breakpoints_inserted
)
2467 insert_breakpoints ();
2469 /* Restart without fiddling with the step ranges or
2476 if (ecs
->sal
.line
== 0)
2478 /* We have no line number information. That means to stop
2479 stepping (does this always happen right after one instruction,
2480 when we do "s" in a function with no line numbers,
2481 or can this happen as a result of a return or longjmp?). */
2483 print_stop_reason (END_STEPPING_RANGE
, 0);
2484 stop_stepping (ecs
);
2488 if ((stop_pc
== ecs
->sal
.pc
)
2489 && (ecs
->current_line
!= ecs
->sal
.line
2490 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2492 /* We are at the start of a different line. So stop. Note that
2493 we don't stop if we step into the middle of a different line.
2494 That is said to make things like for (;;) statements work
2497 print_stop_reason (END_STEPPING_RANGE
, 0);
2498 stop_stepping (ecs
);
2502 /* We aren't done stepping.
2504 Optimize by setting the stepping range to the line.
2505 (We might not be in the original line, but if we entered a
2506 new line in mid-statement, we continue stepping. This makes
2507 things like for(;;) statements work better.) */
2509 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2511 /* If this is the last line of the function, don't keep stepping
2512 (it would probably step us out of the function).
2513 This is particularly necessary for a one-line function,
2514 in which after skipping the prologue we better stop even though
2515 we will be in mid-line. */
2517 print_stop_reason (END_STEPPING_RANGE
, 0);
2518 stop_stepping (ecs
);
2521 step_range_start
= ecs
->sal
.pc
;
2522 step_range_end
= ecs
->sal
.end
;
2523 step_frame_id
= get_frame_id (get_current_frame ());
2524 ecs
->current_line
= ecs
->sal
.line
;
2525 ecs
->current_symtab
= ecs
->sal
.symtab
;
2527 /* In the case where we just stepped out of a function into the
2528 middle of a line of the caller, continue stepping, but
2529 step_frame_id must be modified to current frame */
2531 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2532 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2533 step_frame_id
= current_frame
;
2539 /* Are we in the middle of stepping? */
2542 currently_stepping (struct execution_control_state
*ecs
)
2544 return ((through_sigtramp_breakpoint
== NULL
2545 && !ecs
->handling_longjmp
2546 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2548 || ecs
->stepping_through_solib_after_catch
2549 || bpstat_should_step ());
2553 check_sigtramp2 (struct execution_control_state
*ecs
)
2556 && PC_IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2557 && !PC_IN_SIGTRAMP (prev_pc
, prev_func_name
)
2558 && INNER_THAN (read_sp (), step_sp
))
2560 /* What has happened here is that we have just stepped the
2561 inferior with a signal (because it is a signal which
2562 shouldn't make us stop), thus stepping into sigtramp.
2564 So we need to set a step_resume_break_address breakpoint and
2565 continue until we hit it, and then step. FIXME: This should
2566 be more enduring than a step_resume breakpoint; we should
2567 know that we will later need to keep going rather than
2568 re-hitting the breakpoint here (see the testsuite,
2569 gdb.base/signals.exp where it says "exceedingly difficult"). */
2571 struct symtab_and_line sr_sal
;
2573 init_sal (&sr_sal
); /* initialize to zeroes */
2574 sr_sal
.pc
= prev_pc
;
2575 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2576 /* We perhaps could set the frame if we kept track of what the
2577 frame corresponding to prev_pc was. But we don't, so don't. */
2578 through_sigtramp_breakpoint
=
2579 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_through_sigtramp
);
2580 if (breakpoints_inserted
)
2581 insert_breakpoints ();
2583 ecs
->remove_breakpoints_on_following_step
= 1;
2584 ecs
->another_trap
= 1;
2588 /* Subroutine call with source code we should not step over. Do step
2589 to the first line of code in it. */
2592 step_into_function (struct execution_control_state
*ecs
)
2595 struct symtab_and_line sr_sal
;
2597 s
= find_pc_symtab (stop_pc
);
2598 if (s
&& s
->language
!= language_asm
)
2599 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2601 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2602 /* Use the step_resume_break to step until the end of the prologue,
2603 even if that involves jumps (as it seems to on the vax under
2605 /* If the prologue ends in the middle of a source line, continue to
2606 the end of that source line (if it is still within the function).
2607 Otherwise, just go to end of prologue. */
2608 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2609 /* no, don't either. It skips any code that's legitimately on the
2613 && ecs
->sal
.pc
!= ecs
->stop_func_start
2614 && ecs
->sal
.end
< ecs
->stop_func_end
)
2615 ecs
->stop_func_start
= ecs
->sal
.end
;
2618 if (ecs
->stop_func_start
== stop_pc
)
2620 /* We are already there: stop now. */
2622 print_stop_reason (END_STEPPING_RANGE
, 0);
2623 stop_stepping (ecs
);
2628 /* Put the step-breakpoint there and go until there. */
2629 init_sal (&sr_sal
); /* initialize to zeroes */
2630 sr_sal
.pc
= ecs
->stop_func_start
;
2631 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2632 /* Do not specify what the fp should be when we stop since on
2633 some machines the prologue is where the new fp value is
2635 check_for_old_step_resume_breakpoint ();
2636 step_resume_breakpoint
=
2637 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2638 if (breakpoints_inserted
)
2639 insert_breakpoints ();
2641 /* And make sure stepping stops right away then. */
2642 step_range_end
= step_range_start
;
2647 /* We've just entered a callee, and we wish to resume until it returns
2648 to the caller. Setting a step_resume breakpoint on the return
2649 address will catch a return from the callee.
2651 However, if the callee is recursing, we want to be careful not to
2652 catch returns of those recursive calls, but only of THIS instance
2655 To do this, we set the step_resume bp's frame to our current
2656 caller's frame (step_frame_id, which is set by the "next" or
2657 "until" command, before execution begins). */
2660 step_over_function (struct execution_control_state
*ecs
)
2662 struct symtab_and_line sr_sal
;
2664 init_sal (&sr_sal
); /* initialize to zeros */
2665 sr_sal
.pc
= ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
2666 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2668 check_for_old_step_resume_breakpoint ();
2669 step_resume_breakpoint
=
2670 set_momentary_breakpoint (sr_sal
, get_frame_id (get_current_frame ()),
2673 if (frame_id_p (step_frame_id
)
2674 && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal
.pc
))
2675 step_resume_breakpoint
->frame_id
= step_frame_id
;
2677 if (breakpoints_inserted
)
2678 insert_breakpoints ();
2682 stop_stepping (struct execution_control_state
*ecs
)
2684 if (target_has_execution
)
2686 /* Assuming the inferior still exists, set these up for next
2687 time, just like we did above if we didn't break out of the
2689 prev_pc
= read_pc ();
2690 prev_func_start
= ecs
->stop_func_start
;
2691 prev_func_name
= ecs
->stop_func_name
;
2694 /* Let callers know we don't want to wait for the inferior anymore. */
2695 ecs
->wait_some_more
= 0;
2698 /* This function handles various cases where we need to continue
2699 waiting for the inferior. */
2700 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2703 keep_going (struct execution_control_state
*ecs
)
2705 /* Save the pc before execution, to compare with pc after stop. */
2706 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2707 prev_func_start
= ecs
->stop_func_start
; /* Ok, since if DECR_PC_AFTER
2708 BREAK is defined, the
2709 original pc would not have
2710 been at the start of a
2712 prev_func_name
= ecs
->stop_func_name
;
2714 if (ecs
->update_step_sp
)
2715 step_sp
= read_sp ();
2716 ecs
->update_step_sp
= 0;
2718 /* If we did not do break;, it means we should keep running the
2719 inferior and not return to debugger. */
2721 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2723 /* We took a signal (which we are supposed to pass through to
2724 the inferior, else we'd have done a break above) and we
2725 haven't yet gotten our trap. Simply continue. */
2726 resume (currently_stepping (ecs
), stop_signal
);
2730 /* Either the trap was not expected, but we are continuing
2731 anyway (the user asked that this signal be passed to the
2734 The signal was SIGTRAP, e.g. it was our signal, but we
2735 decided we should resume from it.
2737 We're going to run this baby now!
2739 Insert breakpoints now, unless we are trying to one-proceed
2740 past a breakpoint. */
2741 /* If we've just finished a special step resume and we don't
2742 want to hit a breakpoint, pull em out. */
2743 if (step_resume_breakpoint
== NULL
2744 && through_sigtramp_breakpoint
== NULL
2745 && ecs
->remove_breakpoints_on_following_step
)
2747 ecs
->remove_breakpoints_on_following_step
= 0;
2748 remove_breakpoints ();
2749 breakpoints_inserted
= 0;
2751 else if (!breakpoints_inserted
&&
2752 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
2754 breakpoints_failed
= insert_breakpoints ();
2755 if (breakpoints_failed
)
2757 stop_stepping (ecs
);
2760 breakpoints_inserted
= 1;
2763 trap_expected
= ecs
->another_trap
;
2765 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2766 specifies that such a signal should be delivered to the
2769 Typically, this would occure when a user is debugging a
2770 target monitor on a simulator: the target monitor sets a
2771 breakpoint; the simulator encounters this break-point and
2772 halts the simulation handing control to GDB; GDB, noteing
2773 that the break-point isn't valid, returns control back to the
2774 simulator; the simulator then delivers the hardware
2775 equivalent of a SIGNAL_TRAP to the program being debugged. */
2777 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2778 stop_signal
= TARGET_SIGNAL_0
;
2780 #ifdef SHIFT_INST_REGS
2781 /* I'm not sure when this following segment applies. I do know,
2782 now, that we shouldn't rewrite the regs when we were stopped
2783 by a random signal from the inferior process. */
2784 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2785 (this is only used on the 88k). */
2787 if (!bpstat_explains_signal (stop_bpstat
)
2788 && (stop_signal
!= TARGET_SIGNAL_CHLD
) && !stopped_by_random_signal
)
2790 #endif /* SHIFT_INST_REGS */
2792 resume (currently_stepping (ecs
), stop_signal
);
2795 prepare_to_wait (ecs
);
2798 /* This function normally comes after a resume, before
2799 handle_inferior_event exits. It takes care of any last bits of
2800 housekeeping, and sets the all-important wait_some_more flag. */
2803 prepare_to_wait (struct execution_control_state
*ecs
)
2805 if (ecs
->infwait_state
== infwait_normal_state
)
2807 overlay_cache_invalid
= 1;
2809 /* We have to invalidate the registers BEFORE calling
2810 target_wait because they can be loaded from the target while
2811 in target_wait. This makes remote debugging a bit more
2812 efficient for those targets that provide critical registers
2813 as part of their normal status mechanism. */
2815 registers_changed ();
2816 ecs
->waiton_ptid
= pid_to_ptid (-1);
2817 ecs
->wp
= &(ecs
->ws
);
2819 /* This is the old end of the while loop. Let everybody know we
2820 want to wait for the inferior some more and get called again
2822 ecs
->wait_some_more
= 1;
2825 /* Print why the inferior has stopped. We always print something when
2826 the inferior exits, or receives a signal. The rest of the cases are
2827 dealt with later on in normal_stop() and print_it_typical(). Ideally
2828 there should be a call to this function from handle_inferior_event()
2829 each time stop_stepping() is called.*/
2831 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2833 switch (stop_reason
)
2836 /* We don't deal with these cases from handle_inferior_event()
2839 case END_STEPPING_RANGE
:
2840 /* We are done with a step/next/si/ni command. */
2841 /* For now print nothing. */
2842 /* Print a message only if not in the middle of doing a "step n"
2843 operation for n > 1 */
2844 if (!step_multi
|| !stop_step
)
2845 if (ui_out_is_mi_like_p (uiout
))
2846 ui_out_field_string (uiout
, "reason", "end-stepping-range");
2848 case BREAKPOINT_HIT
:
2849 /* We found a breakpoint. */
2850 /* For now print nothing. */
2853 /* The inferior was terminated by a signal. */
2854 annotate_signalled ();
2855 if (ui_out_is_mi_like_p (uiout
))
2856 ui_out_field_string (uiout
, "reason", "exited-signalled");
2857 ui_out_text (uiout
, "\nProgram terminated with signal ");
2858 annotate_signal_name ();
2859 ui_out_field_string (uiout
, "signal-name",
2860 target_signal_to_name (stop_info
));
2861 annotate_signal_name_end ();
2862 ui_out_text (uiout
, ", ");
2863 annotate_signal_string ();
2864 ui_out_field_string (uiout
, "signal-meaning",
2865 target_signal_to_string (stop_info
));
2866 annotate_signal_string_end ();
2867 ui_out_text (uiout
, ".\n");
2868 ui_out_text (uiout
, "The program no longer exists.\n");
2871 /* The inferior program is finished. */
2872 annotate_exited (stop_info
);
2875 if (ui_out_is_mi_like_p (uiout
))
2876 ui_out_field_string (uiout
, "reason", "exited");
2877 ui_out_text (uiout
, "\nProgram exited with code ");
2878 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2879 (unsigned int) stop_info
);
2880 ui_out_text (uiout
, ".\n");
2884 if (ui_out_is_mi_like_p (uiout
))
2885 ui_out_field_string (uiout
, "reason", "exited-normally");
2886 ui_out_text (uiout
, "\nProgram exited normally.\n");
2889 case SIGNAL_RECEIVED
:
2890 /* Signal received. The signal table tells us to print about
2893 ui_out_text (uiout
, "\nProgram received signal ");
2894 annotate_signal_name ();
2895 if (ui_out_is_mi_like_p (uiout
))
2896 ui_out_field_string (uiout
, "reason", "signal-received");
2897 ui_out_field_string (uiout
, "signal-name",
2898 target_signal_to_name (stop_info
));
2899 annotate_signal_name_end ();
2900 ui_out_text (uiout
, ", ");
2901 annotate_signal_string ();
2902 ui_out_field_string (uiout
, "signal-meaning",
2903 target_signal_to_string (stop_info
));
2904 annotate_signal_string_end ();
2905 ui_out_text (uiout
, ".\n");
2908 internal_error (__FILE__
, __LINE__
,
2909 "print_stop_reason: unrecognized enum value");
2915 /* Here to return control to GDB when the inferior stops for real.
2916 Print appropriate messages, remove breakpoints, give terminal our modes.
2918 STOP_PRINT_FRAME nonzero means print the executing frame
2919 (pc, function, args, file, line number and line text).
2920 BREAKPOINTS_FAILED nonzero means stop was due to error
2921 attempting to insert breakpoints. */
2926 /* As with the notification of thread events, we want to delay
2927 notifying the user that we've switched thread context until
2928 the inferior actually stops.
2930 (Note that there's no point in saying anything if the inferior
2932 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
2933 && target_has_execution
)
2935 target_terminal_ours_for_output ();
2936 printf_filtered ("[Switching to %s]\n",
2937 target_pid_or_tid_to_str (inferior_ptid
));
2938 previous_inferior_ptid
= inferior_ptid
;
2941 /* Make sure that the current_frame's pc is correct. This
2942 is a correction for setting up the frame info before doing
2943 DECR_PC_AFTER_BREAK */
2944 if (target_has_execution
)
2945 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2946 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2947 frame code to check for this and sort out any resultant mess.
2948 DECR_PC_AFTER_BREAK needs to just go away. */
2949 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2951 if (target_has_execution
&& breakpoints_inserted
)
2953 if (remove_breakpoints ())
2955 target_terminal_ours_for_output ();
2956 printf_filtered ("Cannot remove breakpoints because ");
2957 printf_filtered ("program is no longer writable.\n");
2958 printf_filtered ("It might be running in another process.\n");
2959 printf_filtered ("Further execution is probably impossible.\n");
2962 breakpoints_inserted
= 0;
2964 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2965 Delete any breakpoint that is to be deleted at the next stop. */
2967 breakpoint_auto_delete (stop_bpstat
);
2969 /* If an auto-display called a function and that got a signal,
2970 delete that auto-display to avoid an infinite recursion. */
2972 if (stopped_by_random_signal
)
2973 disable_current_display ();
2975 /* Don't print a message if in the middle of doing a "step n"
2976 operation for n > 1 */
2977 if (step_multi
&& stop_step
)
2980 target_terminal_ours ();
2982 /* Look up the hook_stop and run it (CLI internally handles problem
2983 of stop_command's pre-hook not existing). */
2985 catch_errors (hook_stop_stub
, stop_command
,
2986 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
2988 if (!target_has_stack
)
2994 /* Select innermost stack frame - i.e., current frame is frame 0,
2995 and current location is based on that.
2996 Don't do this on return from a stack dummy routine,
2997 or if the program has exited. */
2999 if (!stop_stack_dummy
)
3001 select_frame (get_current_frame ());
3003 /* Print current location without a level number, if
3004 we have changed functions or hit a breakpoint.
3005 Print source line if we have one.
3006 bpstat_print() contains the logic deciding in detail
3007 what to print, based on the event(s) that just occurred. */
3009 if (stop_print_frame
&& deprecated_selected_frame
)
3013 int do_frame_printing
= 1;
3015 bpstat_ret
= bpstat_print (stop_bpstat
);
3019 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3020 (or should) carry around the function and does (or
3021 should) use that when doing a frame comparison. */
3023 && frame_id_eq (step_frame_id
,
3024 get_frame_id (get_current_frame ()))
3025 && step_start_function
== find_pc_function (stop_pc
))
3026 source_flag
= SRC_LINE
; /* finished step, just print source line */
3028 source_flag
= SRC_AND_LOC
; /* print location and source line */
3030 case PRINT_SRC_AND_LOC
:
3031 source_flag
= SRC_AND_LOC
; /* print location and source line */
3033 case PRINT_SRC_ONLY
:
3034 source_flag
= SRC_LINE
;
3037 source_flag
= SRC_LINE
; /* something bogus */
3038 do_frame_printing
= 0;
3041 internal_error (__FILE__
, __LINE__
, "Unknown value.");
3043 /* For mi, have the same behavior every time we stop:
3044 print everything but the source line. */
3045 if (ui_out_is_mi_like_p (uiout
))
3046 source_flag
= LOC_AND_ADDRESS
;
3048 if (ui_out_is_mi_like_p (uiout
))
3049 ui_out_field_int (uiout
, "thread-id",
3050 pid_to_thread_id (inferior_ptid
));
3051 /* The behavior of this routine with respect to the source
3053 SRC_LINE: Print only source line
3054 LOCATION: Print only location
3055 SRC_AND_LOC: Print location and source line */
3056 if (do_frame_printing
)
3057 print_stack_frame (deprecated_selected_frame
, -1, source_flag
);
3059 /* Display the auto-display expressions. */
3064 /* Save the function value return registers, if we care.
3065 We might be about to restore their previous contents. */
3066 if (proceed_to_finish
)
3067 /* NB: The copy goes through to the target picking up the value of
3068 all the registers. */
3069 regcache_cpy (stop_registers
, current_regcache
);
3071 if (stop_stack_dummy
)
3073 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3074 ends with a setting of the current frame, so we can use that
3076 frame_pop (get_current_frame ());
3077 /* Set stop_pc to what it was before we called the function.
3078 Can't rely on restore_inferior_status because that only gets
3079 called if we don't stop in the called function. */
3080 stop_pc
= read_pc ();
3081 select_frame (get_current_frame ());
3085 annotate_stopped ();
3086 observer_notify_normal_stop ();
3090 hook_stop_stub (void *cmd
)
3092 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3097 signal_stop_state (int signo
)
3099 return signal_stop
[signo
];
3103 signal_print_state (int signo
)
3105 return signal_print
[signo
];
3109 signal_pass_state (int signo
)
3111 return signal_program
[signo
];
3115 signal_stop_update (int signo
, int state
)
3117 int ret
= signal_stop
[signo
];
3118 signal_stop
[signo
] = state
;
3123 signal_print_update (int signo
, int state
)
3125 int ret
= signal_print
[signo
];
3126 signal_print
[signo
] = state
;
3131 signal_pass_update (int signo
, int state
)
3133 int ret
= signal_program
[signo
];
3134 signal_program
[signo
] = state
;
3139 sig_print_header (void)
3142 Signal Stop\tPrint\tPass to program\tDescription\n");
3146 sig_print_info (enum target_signal oursig
)
3148 char *name
= target_signal_to_name (oursig
);
3149 int name_padding
= 13 - strlen (name
);
3151 if (name_padding
<= 0)
3154 printf_filtered ("%s", name
);
3155 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3156 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3157 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3158 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3159 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3162 /* Specify how various signals in the inferior should be handled. */
3165 handle_command (char *args
, int from_tty
)
3168 int digits
, wordlen
;
3169 int sigfirst
, signum
, siglast
;
3170 enum target_signal oursig
;
3173 unsigned char *sigs
;
3174 struct cleanup
*old_chain
;
3178 error_no_arg ("signal to handle");
3181 /* Allocate and zero an array of flags for which signals to handle. */
3183 nsigs
= (int) TARGET_SIGNAL_LAST
;
3184 sigs
= (unsigned char *) alloca (nsigs
);
3185 memset (sigs
, 0, nsigs
);
3187 /* Break the command line up into args. */
3189 argv
= buildargv (args
);
3194 old_chain
= make_cleanup_freeargv (argv
);
3196 /* Walk through the args, looking for signal oursigs, signal names, and
3197 actions. Signal numbers and signal names may be interspersed with
3198 actions, with the actions being performed for all signals cumulatively
3199 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3201 while (*argv
!= NULL
)
3203 wordlen
= strlen (*argv
);
3204 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3208 sigfirst
= siglast
= -1;
3210 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3212 /* Apply action to all signals except those used by the
3213 debugger. Silently skip those. */
3216 siglast
= nsigs
- 1;
3218 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3220 SET_SIGS (nsigs
, sigs
, signal_stop
);
3221 SET_SIGS (nsigs
, sigs
, signal_print
);
3223 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3225 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3227 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3229 SET_SIGS (nsigs
, sigs
, signal_print
);
3231 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3233 SET_SIGS (nsigs
, sigs
, signal_program
);
3235 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3237 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3239 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3241 SET_SIGS (nsigs
, sigs
, signal_program
);
3243 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3245 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3246 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3248 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3250 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3252 else if (digits
> 0)
3254 /* It is numeric. The numeric signal refers to our own
3255 internal signal numbering from target.h, not to host/target
3256 signal number. This is a feature; users really should be
3257 using symbolic names anyway, and the common ones like
3258 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3260 sigfirst
= siglast
= (int)
3261 target_signal_from_command (atoi (*argv
));
3262 if ((*argv
)[digits
] == '-')
3265 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3267 if (sigfirst
> siglast
)
3269 /* Bet he didn't figure we'd think of this case... */
3277 oursig
= target_signal_from_name (*argv
);
3278 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3280 sigfirst
= siglast
= (int) oursig
;
3284 /* Not a number and not a recognized flag word => complain. */
3285 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3289 /* If any signal numbers or symbol names were found, set flags for
3290 which signals to apply actions to. */
3292 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3294 switch ((enum target_signal
) signum
)
3296 case TARGET_SIGNAL_TRAP
:
3297 case TARGET_SIGNAL_INT
:
3298 if (!allsigs
&& !sigs
[signum
])
3300 if (query ("%s is used by the debugger.\n\
3301 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3307 printf_unfiltered ("Not confirmed, unchanged.\n");
3308 gdb_flush (gdb_stdout
);
3312 case TARGET_SIGNAL_0
:
3313 case TARGET_SIGNAL_DEFAULT
:
3314 case TARGET_SIGNAL_UNKNOWN
:
3315 /* Make sure that "all" doesn't print these. */
3326 target_notice_signals (inferior_ptid
);
3330 /* Show the results. */
3331 sig_print_header ();
3332 for (signum
= 0; signum
< nsigs
; signum
++)
3336 sig_print_info (signum
);
3341 do_cleanups (old_chain
);
3345 xdb_handle_command (char *args
, int from_tty
)
3348 struct cleanup
*old_chain
;
3350 /* Break the command line up into args. */
3352 argv
= buildargv (args
);
3357 old_chain
= make_cleanup_freeargv (argv
);
3358 if (argv
[1] != (char *) NULL
)
3363 bufLen
= strlen (argv
[0]) + 20;
3364 argBuf
= (char *) xmalloc (bufLen
);
3368 enum target_signal oursig
;
3370 oursig
= target_signal_from_name (argv
[0]);
3371 memset (argBuf
, 0, bufLen
);
3372 if (strcmp (argv
[1], "Q") == 0)
3373 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3376 if (strcmp (argv
[1], "s") == 0)
3378 if (!signal_stop
[oursig
])
3379 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3381 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3383 else if (strcmp (argv
[1], "i") == 0)
3385 if (!signal_program
[oursig
])
3386 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3388 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3390 else if (strcmp (argv
[1], "r") == 0)
3392 if (!signal_print
[oursig
])
3393 sprintf (argBuf
, "%s %s", argv
[0], "print");
3395 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3401 handle_command (argBuf
, from_tty
);
3403 printf_filtered ("Invalid signal handling flag.\n");
3408 do_cleanups (old_chain
);
3411 /* Print current contents of the tables set by the handle command.
3412 It is possible we should just be printing signals actually used
3413 by the current target (but for things to work right when switching
3414 targets, all signals should be in the signal tables). */
3417 signals_info (char *signum_exp
, int from_tty
)
3419 enum target_signal oursig
;
3420 sig_print_header ();
3424 /* First see if this is a symbol name. */
3425 oursig
= target_signal_from_name (signum_exp
);
3426 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3428 /* No, try numeric. */
3430 target_signal_from_command (parse_and_eval_long (signum_exp
));
3432 sig_print_info (oursig
);
3436 printf_filtered ("\n");
3437 /* These ugly casts brought to you by the native VAX compiler. */
3438 for (oursig
= TARGET_SIGNAL_FIRST
;
3439 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3440 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3444 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3445 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3446 sig_print_info (oursig
);
3449 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3452 struct inferior_status
3454 enum target_signal stop_signal
;
3458 int stop_stack_dummy
;
3459 int stopped_by_random_signal
;
3461 CORE_ADDR step_range_start
;
3462 CORE_ADDR step_range_end
;
3463 struct frame_id step_frame_id
;
3464 enum step_over_calls_kind step_over_calls
;
3465 CORE_ADDR step_resume_break_address
;
3466 int stop_after_trap
;
3467 int stop_soon_quietly
;
3468 struct regcache
*stop_registers
;
3470 /* These are here because if call_function_by_hand has written some
3471 registers and then decides to call error(), we better not have changed
3473 struct regcache
*registers
;
3475 /* A frame unique identifier. */
3476 struct frame_id selected_frame_id
;
3478 int breakpoint_proceeded
;
3479 int restore_stack_info
;
3480 int proceed_to_finish
;
3484 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3487 int size
= REGISTER_RAW_SIZE (regno
);
3488 void *buf
= alloca (size
);
3489 store_signed_integer (buf
, size
, val
);
3490 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3493 /* Save all of the information associated with the inferior<==>gdb
3494 connection. INF_STATUS is a pointer to a "struct inferior_status"
3495 (defined in inferior.h). */
3497 struct inferior_status
*
3498 save_inferior_status (int restore_stack_info
)
3500 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3502 inf_status
->stop_signal
= stop_signal
;
3503 inf_status
->stop_pc
= stop_pc
;
3504 inf_status
->stop_step
= stop_step
;
3505 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3506 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3507 inf_status
->trap_expected
= trap_expected
;
3508 inf_status
->step_range_start
= step_range_start
;
3509 inf_status
->step_range_end
= step_range_end
;
3510 inf_status
->step_frame_id
= step_frame_id
;
3511 inf_status
->step_over_calls
= step_over_calls
;
3512 inf_status
->stop_after_trap
= stop_after_trap
;
3513 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
3514 /* Save original bpstat chain here; replace it with copy of chain.
3515 If caller's caller is walking the chain, they'll be happier if we
3516 hand them back the original chain when restore_inferior_status is
3518 inf_status
->stop_bpstat
= stop_bpstat
;
3519 stop_bpstat
= bpstat_copy (stop_bpstat
);
3520 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3521 inf_status
->restore_stack_info
= restore_stack_info
;
3522 inf_status
->proceed_to_finish
= proceed_to_finish
;
3524 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3526 inf_status
->registers
= regcache_dup (current_regcache
);
3528 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3533 restore_selected_frame (void *args
)
3535 struct frame_id
*fid
= (struct frame_id
*) args
;
3536 struct frame_info
*frame
;
3538 frame
= frame_find_by_id (*fid
);
3540 /* If inf_status->selected_frame_id is NULL, there was no previously
3544 warning ("Unable to restore previously selected frame.\n");
3548 select_frame (frame
);
3554 restore_inferior_status (struct inferior_status
*inf_status
)
3556 stop_signal
= inf_status
->stop_signal
;
3557 stop_pc
= inf_status
->stop_pc
;
3558 stop_step
= inf_status
->stop_step
;
3559 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3560 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3561 trap_expected
= inf_status
->trap_expected
;
3562 step_range_start
= inf_status
->step_range_start
;
3563 step_range_end
= inf_status
->step_range_end
;
3564 step_frame_id
= inf_status
->step_frame_id
;
3565 step_over_calls
= inf_status
->step_over_calls
;
3566 stop_after_trap
= inf_status
->stop_after_trap
;
3567 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
3568 bpstat_clear (&stop_bpstat
);
3569 stop_bpstat
= inf_status
->stop_bpstat
;
3570 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3571 proceed_to_finish
= inf_status
->proceed_to_finish
;
3573 /* FIXME: Is the restore of stop_registers always needed. */
3574 regcache_xfree (stop_registers
);
3575 stop_registers
= inf_status
->stop_registers
;
3577 /* The inferior can be gone if the user types "print exit(0)"
3578 (and perhaps other times). */
3579 if (target_has_execution
)
3580 /* NB: The register write goes through to the target. */
3581 regcache_cpy (current_regcache
, inf_status
->registers
);
3582 regcache_xfree (inf_status
->registers
);
3584 /* FIXME: If we are being called after stopping in a function which
3585 is called from gdb, we should not be trying to restore the
3586 selected frame; it just prints a spurious error message (The
3587 message is useful, however, in detecting bugs in gdb (like if gdb
3588 clobbers the stack)). In fact, should we be restoring the
3589 inferior status at all in that case? . */
3591 if (target_has_stack
&& inf_status
->restore_stack_info
)
3593 /* The point of catch_errors is that if the stack is clobbered,
3594 walking the stack might encounter a garbage pointer and
3595 error() trying to dereference it. */
3597 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3598 "Unable to restore previously selected frame:\n",
3599 RETURN_MASK_ERROR
) == 0)
3600 /* Error in restoring the selected frame. Select the innermost
3602 select_frame (get_current_frame ());
3610 do_restore_inferior_status_cleanup (void *sts
)
3612 restore_inferior_status (sts
);
3616 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3618 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3622 discard_inferior_status (struct inferior_status
*inf_status
)
3624 /* See save_inferior_status for info on stop_bpstat. */
3625 bpstat_clear (&inf_status
->stop_bpstat
);
3626 regcache_xfree (inf_status
->registers
);
3627 regcache_xfree (inf_status
->stop_registers
);
3632 inferior_has_forked (int pid
, int *child_pid
)
3634 struct target_waitstatus last
;
3637 get_last_target_status (&last_ptid
, &last
);
3639 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3642 if (ptid_get_pid (last_ptid
) != pid
)
3645 *child_pid
= last
.value
.related_pid
;
3650 inferior_has_vforked (int pid
, int *child_pid
)
3652 struct target_waitstatus last
;
3655 get_last_target_status (&last_ptid
, &last
);
3657 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3660 if (ptid_get_pid (last_ptid
) != pid
)
3663 *child_pid
= last
.value
.related_pid
;
3668 inferior_has_execd (int pid
, char **execd_pathname
)
3670 struct target_waitstatus last
;
3673 get_last_target_status (&last_ptid
, &last
);
3675 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3678 if (ptid_get_pid (last_ptid
) != pid
)
3681 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3685 /* Oft used ptids */
3687 ptid_t minus_one_ptid
;
3689 /* Create a ptid given the necessary PID, LWP, and TID components. */
3692 ptid_build (int pid
, long lwp
, long tid
)
3702 /* Create a ptid from just a pid. */
3705 pid_to_ptid (int pid
)
3707 return ptid_build (pid
, 0, 0);
3710 /* Fetch the pid (process id) component from a ptid. */
3713 ptid_get_pid (ptid_t ptid
)
3718 /* Fetch the lwp (lightweight process) component from a ptid. */
3721 ptid_get_lwp (ptid_t ptid
)
3726 /* Fetch the tid (thread id) component from a ptid. */
3729 ptid_get_tid (ptid_t ptid
)
3734 /* ptid_equal() is used to test equality of two ptids. */
3737 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3739 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3740 && ptid1
.tid
== ptid2
.tid
);
3743 /* restore_inferior_ptid() will be used by the cleanup machinery
3744 to restore the inferior_ptid value saved in a call to
3745 save_inferior_ptid(). */
3748 restore_inferior_ptid (void *arg
)
3750 ptid_t
*saved_ptid_ptr
= arg
;
3751 inferior_ptid
= *saved_ptid_ptr
;
3755 /* Save the value of inferior_ptid so that it may be restored by a
3756 later call to do_cleanups(). Returns the struct cleanup pointer
3757 needed for later doing the cleanup. */
3760 save_inferior_ptid (void)
3762 ptid_t
*saved_ptid_ptr
;
3764 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3765 *saved_ptid_ptr
= inferior_ptid
;
3766 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3773 stop_registers
= regcache_xmalloc (current_gdbarch
);
3777 _initialize_infrun (void)
3780 register int numsigs
;
3781 struct cmd_list_element
*c
;
3783 register_gdbarch_swap (&stop_registers
, sizeof (stop_registers
), NULL
);
3784 register_gdbarch_swap (NULL
, 0, build_infrun
);
3786 add_info ("signals", signals_info
,
3787 "What debugger does when program gets various signals.\n\
3788 Specify a signal as argument to print info on that signal only.");
3789 add_info_alias ("handle", "signals", 0);
3791 add_com ("handle", class_run
, handle_command
,
3792 concat ("Specify how to handle a signal.\n\
3793 Args are signals and actions to apply to those signals.\n\
3794 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3795 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3796 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3797 The special arg \"all\" is recognized to mean all signals except those\n\
3798 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3799 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3800 Stop means reenter debugger if this signal happens (implies print).\n\
3801 Print means print a message if this signal happens.\n\
3802 Pass means let program see this signal; otherwise program doesn't know.\n\
3803 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3804 Pass and Stop may be combined.", NULL
));
3807 add_com ("lz", class_info
, signals_info
,
3808 "What debugger does when program gets various signals.\n\
3809 Specify a signal as argument to print info on that signal only.");
3810 add_com ("z", class_run
, xdb_handle_command
,
3811 concat ("Specify how to handle a signal.\n\
3812 Args are signals and actions to apply to those signals.\n\
3813 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3814 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3815 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3816 The special arg \"all\" is recognized to mean all signals except those\n\
3817 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3818 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3819 nopass), \"Q\" (noprint)\n\
3820 Stop means reenter debugger if this signal happens (implies print).\n\
3821 Print means print a message if this signal happens.\n\
3822 Pass means let program see this signal; otherwise program doesn't know.\n\
3823 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3824 Pass and Stop may be combined.", NULL
));
3829 add_cmd ("stop", class_obscure
, not_just_help_class_command
, "There is no `stop' command, but you can set a hook on `stop'.\n\
3830 This allows you to set a list of commands to be run each time execution\n\
3831 of the program stops.", &cmdlist
);
3833 numsigs
= (int) TARGET_SIGNAL_LAST
;
3834 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3835 signal_print
= (unsigned char *)
3836 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3837 signal_program
= (unsigned char *)
3838 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3839 for (i
= 0; i
< numsigs
; i
++)
3842 signal_print
[i
] = 1;
3843 signal_program
[i
] = 1;
3846 /* Signals caused by debugger's own actions
3847 should not be given to the program afterwards. */
3848 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3849 signal_program
[TARGET_SIGNAL_INT
] = 0;
3851 /* Signals that are not errors should not normally enter the debugger. */
3852 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3853 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3854 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3855 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3856 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3857 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3858 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3859 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3860 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3861 signal_print
[TARGET_SIGNAL_IO
] = 0;
3862 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3863 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3864 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3865 signal_print
[TARGET_SIGNAL_URG
] = 0;
3866 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
3867 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
3869 /* These signals are used internally by user-level thread
3870 implementations. (See signal(5) on Solaris.) Like the above
3871 signals, a healthy program receives and handles them as part of
3872 its normal operation. */
3873 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
3874 signal_print
[TARGET_SIGNAL_LWP
] = 0;
3875 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
3876 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
3877 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
3878 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
3882 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
3883 (char *) &stop_on_solib_events
,
3884 "Set stopping for shared library events.\n\
3885 If nonzero, gdb will give control to the user when the dynamic linker\n\
3886 notifies gdb of shared library events. The most common event of interest\n\
3887 to the user would be loading/unloading of a new library.\n", &setlist
), &showlist
);
3890 c
= add_set_enum_cmd ("follow-fork-mode",
3892 follow_fork_mode_kind_names
, &follow_fork_mode_string
,
3893 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
3894 kernel problem. It's also not terribly useful without a GUI to
3895 help the user drive two debuggers. So for now, I'm disabling
3896 the "both" option. */
3897 /* "Set debugger response to a program call of fork \
3899 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3900 parent - the original process is debugged after a fork\n\
3901 child - the new process is debugged after a fork\n\
3902 both - both the parent and child are debugged after a fork\n\
3903 ask - the debugger will ask for one of the above choices\n\
3904 For \"both\", another copy of the debugger will be started to follow\n\
3905 the new child process. The original debugger will continue to follow\n\
3906 the original parent process. To distinguish their prompts, the\n\
3907 debugger copy's prompt will be changed.\n\
3908 For \"parent\" or \"child\", the unfollowed process will run free.\n\
3909 By default, the debugger will follow the parent process.",
3911 "Set debugger response to a program call of fork \
3913 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3914 parent - the original process is debugged after a fork\n\
3915 child - the new process is debugged after a fork\n\
3916 ask - the debugger will ask for one of the above choices\n\
3917 For \"parent\" or \"child\", the unfollowed process will run free.\n\
3918 By default, the debugger will follow the parent process.", &setlist
);
3919 add_show_from_set (c
, &showlist
);
3921 c
= add_set_enum_cmd ("scheduler-locking", class_run
, scheduler_enums
, /* array of string names */
3922 &scheduler_mode
, /* current mode */
3923 "Set mode for locking scheduler during execution.\n\
3924 off == no locking (threads may preempt at any time)\n\
3925 on == full locking (no thread except the current thread may run)\n\
3926 step == scheduler locked during every single-step operation.\n\
3927 In this mode, no other thread may run during a step command.\n\
3928 Other threads may run while stepping over a function call ('next').", &setlist
);
3930 set_cmd_sfunc (c
, set_schedlock_func
); /* traps on target vector */
3931 add_show_from_set (c
, &showlist
);
3933 c
= add_set_cmd ("step-mode", class_run
,
3934 var_boolean
, (char *) &step_stop_if_no_debug
,
3935 "Set mode of the step operation. When set, doing a step over a\n\
3936 function without debug line information will stop at the first\n\
3937 instruction of that function. Otherwise, the function is skipped and\n\
3938 the step command stops at a different source line.", &setlist
);
3939 add_show_from_set (c
, &showlist
);
3941 /* ptid initializations */
3942 null_ptid
= ptid_build (0, 0, 0);
3943 minus_one_ptid
= ptid_build (-1, 0, 0);
3944 inferior_ptid
= null_ptid
;
3945 target_last_wait_ptid
= minus_one_ptid
;