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 enum stop_kind stop_soon
;
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
= NO_STOP_QUIETLY
;
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 of the program the last time it stopped. This is
790 just used internally by wait_for_inferior, but need to be preserved
791 over calls to it and cleared when the inferior is started. */
792 static CORE_ADDR prev_pc
;
795 /* Start remote-debugging of a machine over a serial link. */
801 init_wait_for_inferior ();
802 stop_soon
= STOP_QUIETLY
;
805 /* Always go on waiting for the target, regardless of the mode. */
806 /* FIXME: cagney/1999-09-23: At present it isn't possible to
807 indicate to wait_for_inferior that a target should timeout if
808 nothing is returned (instead of just blocking). Because of this,
809 targets expecting an immediate response need to, internally, set
810 things up so that the target_wait() is forced to eventually
812 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
813 differentiate to its caller what the state of the target is after
814 the initial open has been performed. Here we're assuming that
815 the target has stopped. It should be possible to eventually have
816 target_open() return to the caller an indication that the target
817 is currently running and GDB state should be set to the same as
819 wait_for_inferior ();
823 /* Initialize static vars when a new inferior begins. */
826 init_wait_for_inferior (void)
828 /* These are meaningless until the first time through wait_for_inferior. */
832 trap_expected_after_continue
= 0;
834 breakpoints_inserted
= 0;
835 breakpoint_init_inferior (inf_starting
);
837 /* Don't confuse first call to proceed(). */
838 stop_signal
= TARGET_SIGNAL_0
;
840 /* The first resume is not following a fork/vfork/exec. */
841 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
843 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
844 number_of_threads_in_syscalls
= 0;
846 clear_proceed_status ();
850 delete_breakpoint_current_contents (void *arg
)
852 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
853 if (*breakpointp
!= NULL
)
855 delete_breakpoint (*breakpointp
);
860 /* This enum encodes possible reasons for doing a target_wait, so that
861 wfi can call target_wait in one place. (Ultimately the call will be
862 moved out of the infinite loop entirely.) */
866 infwait_normal_state
,
867 infwait_thread_hop_state
,
868 infwait_nullified_state
,
869 infwait_nonstep_watch_state
872 /* Why did the inferior stop? Used to print the appropriate messages
873 to the interface from within handle_inferior_event(). */
874 enum inferior_stop_reason
876 /* We don't know why. */
878 /* Step, next, nexti, stepi finished. */
880 /* Found breakpoint. */
882 /* Inferior terminated by signal. */
884 /* Inferior exited. */
886 /* Inferior received signal, and user asked to be notified. */
890 /* This structure contains what used to be local variables in
891 wait_for_inferior. Probably many of them can return to being
892 locals in handle_inferior_event. */
894 struct execution_control_state
896 struct target_waitstatus ws
;
897 struct target_waitstatus
*wp
;
900 CORE_ADDR stop_func_start
;
901 CORE_ADDR stop_func_end
;
902 char *stop_func_name
;
903 struct symtab_and_line sal
;
904 int remove_breakpoints_on_following_step
;
906 struct symtab
*current_symtab
;
907 int handling_longjmp
; /* FIXME */
909 ptid_t saved_inferior_ptid
;
911 int stepping_through_solib_after_catch
;
912 bpstat stepping_through_solib_catchpoints
;
913 int enable_hw_watchpoints_after_wait
;
914 int stepping_through_sigtramp
;
915 int new_thread_event
;
916 struct target_waitstatus tmpstatus
;
917 enum infwait_states infwait_state
;
922 void init_execution_control_state (struct execution_control_state
*ecs
);
924 void handle_inferior_event (struct execution_control_state
*ecs
);
926 static void check_sigtramp2 (struct execution_control_state
*ecs
);
927 static void step_into_function (struct execution_control_state
*ecs
);
928 static void step_over_function (struct execution_control_state
*ecs
);
929 static void stop_stepping (struct execution_control_state
*ecs
);
930 static void prepare_to_wait (struct execution_control_state
*ecs
);
931 static void keep_going (struct execution_control_state
*ecs
);
932 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
935 /* Wait for control to return from inferior to debugger.
936 If inferior gets a signal, we may decide to start it up again
937 instead of returning. That is why there is a loop in this function.
938 When this function actually returns it means the inferior
939 should be left stopped and GDB should read more commands. */
942 wait_for_inferior (void)
944 struct cleanup
*old_cleanups
;
945 struct execution_control_state ecss
;
946 struct execution_control_state
*ecs
;
948 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
949 &step_resume_breakpoint
);
950 make_cleanup (delete_breakpoint_current_contents
,
951 &through_sigtramp_breakpoint
);
953 /* wfi still stays in a loop, so it's OK just to take the address of
954 a local to get the ecs pointer. */
957 /* Fill in with reasonable starting values. */
958 init_execution_control_state (ecs
);
960 /* We'll update this if & when we switch to a new thread. */
961 previous_inferior_ptid
= inferior_ptid
;
963 overlay_cache_invalid
= 1;
965 /* We have to invalidate the registers BEFORE calling target_wait
966 because they can be loaded from the target while in target_wait.
967 This makes remote debugging a bit more efficient for those
968 targets that provide critical registers as part of their normal
971 registers_changed ();
975 if (target_wait_hook
)
976 ecs
->ptid
= target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
978 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
980 /* Now figure out what to do with the result of the result. */
981 handle_inferior_event (ecs
);
983 if (!ecs
->wait_some_more
)
986 do_cleanups (old_cleanups
);
989 /* Asynchronous version of wait_for_inferior. It is called by the
990 event loop whenever a change of state is detected on the file
991 descriptor corresponding to the target. It can be called more than
992 once to complete a single execution command. In such cases we need
993 to keep the state in a global variable ASYNC_ECSS. If it is the
994 last time that this function is called for a single execution
995 command, then report to the user that the inferior has stopped, and
996 do the necessary cleanups. */
998 struct execution_control_state async_ecss
;
999 struct execution_control_state
*async_ecs
;
1002 fetch_inferior_event (void *client_data
)
1004 static struct cleanup
*old_cleanups
;
1006 async_ecs
= &async_ecss
;
1008 if (!async_ecs
->wait_some_more
)
1010 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1011 &step_resume_breakpoint
);
1012 make_exec_cleanup (delete_breakpoint_current_contents
,
1013 &through_sigtramp_breakpoint
);
1015 /* Fill in with reasonable starting values. */
1016 init_execution_control_state (async_ecs
);
1018 /* We'll update this if & when we switch to a new thread. */
1019 previous_inferior_ptid
= inferior_ptid
;
1021 overlay_cache_invalid
= 1;
1023 /* We have to invalidate the registers BEFORE calling target_wait
1024 because they can be loaded from the target while in target_wait.
1025 This makes remote debugging a bit more efficient for those
1026 targets that provide critical registers as part of their normal
1027 status mechanism. */
1029 registers_changed ();
1032 if (target_wait_hook
)
1034 target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1036 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1038 /* Now figure out what to do with the result of the result. */
1039 handle_inferior_event (async_ecs
);
1041 if (!async_ecs
->wait_some_more
)
1043 /* Do only the cleanups that have been added by this
1044 function. Let the continuations for the commands do the rest,
1045 if there are any. */
1046 do_exec_cleanups (old_cleanups
);
1048 if (step_multi
&& stop_step
)
1049 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1051 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1055 /* Prepare an execution control state for looping through a
1056 wait_for_inferior-type loop. */
1059 init_execution_control_state (struct execution_control_state
*ecs
)
1061 /* ecs->another_trap? */
1062 ecs
->random_signal
= 0;
1063 ecs
->remove_breakpoints_on_following_step
= 0;
1064 ecs
->handling_longjmp
= 0; /* FIXME */
1065 ecs
->update_step_sp
= 0;
1066 ecs
->stepping_through_solib_after_catch
= 0;
1067 ecs
->stepping_through_solib_catchpoints
= NULL
;
1068 ecs
->enable_hw_watchpoints_after_wait
= 0;
1069 ecs
->stepping_through_sigtramp
= 0;
1070 ecs
->sal
= find_pc_line (prev_pc
, 0);
1071 ecs
->current_line
= ecs
->sal
.line
;
1072 ecs
->current_symtab
= ecs
->sal
.symtab
;
1073 ecs
->infwait_state
= infwait_normal_state
;
1074 ecs
->waiton_ptid
= pid_to_ptid (-1);
1075 ecs
->wp
= &(ecs
->ws
);
1078 /* Call this function before setting step_resume_breakpoint, as a
1079 sanity check. There should never be more than one step-resume
1080 breakpoint per thread, so we should never be setting a new
1081 step_resume_breakpoint when one is already active. */
1083 check_for_old_step_resume_breakpoint (void)
1085 if (step_resume_breakpoint
)
1087 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1090 /* Return the cached copy of the last pid/waitstatus returned by
1091 target_wait()/target_wait_hook(). The data is actually cached by
1092 handle_inferior_event(), which gets called immediately after
1093 target_wait()/target_wait_hook(). */
1096 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1098 *ptidp
= target_last_wait_ptid
;
1099 *status
= target_last_waitstatus
;
1102 /* Switch thread contexts, maintaining "infrun state". */
1105 context_switch (struct execution_control_state
*ecs
)
1107 /* Caution: it may happen that the new thread (or the old one!)
1108 is not in the thread list. In this case we must not attempt
1109 to "switch context", or we run the risk that our context may
1110 be lost. This may happen as a result of the target module
1111 mishandling thread creation. */
1113 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1114 { /* Perform infrun state context switch: */
1115 /* Save infrun state for the old thread. */
1116 save_infrun_state (inferior_ptid
, prev_pc
,
1117 trap_expected
, step_resume_breakpoint
,
1118 through_sigtramp_breakpoint
, step_range_start
,
1119 step_range_end
, &step_frame_id
,
1120 ecs
->handling_longjmp
, ecs
->another_trap
,
1121 ecs
->stepping_through_solib_after_catch
,
1122 ecs
->stepping_through_solib_catchpoints
,
1123 ecs
->stepping_through_sigtramp
,
1124 ecs
->current_line
, ecs
->current_symtab
, step_sp
);
1126 /* Load infrun state for the new thread. */
1127 load_infrun_state (ecs
->ptid
, &prev_pc
,
1128 &trap_expected
, &step_resume_breakpoint
,
1129 &through_sigtramp_breakpoint
, &step_range_start
,
1130 &step_range_end
, &step_frame_id
,
1131 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1132 &ecs
->stepping_through_solib_after_catch
,
1133 &ecs
->stepping_through_solib_catchpoints
,
1134 &ecs
->stepping_through_sigtramp
,
1135 &ecs
->current_line
, &ecs
->current_symtab
, &step_sp
);
1137 inferior_ptid
= ecs
->ptid
;
1140 /* Wrapper for PC_IN_SIGTRAMP that takes care of the need to find the
1143 In a classic example of "left hand VS right hand", "infrun.c" was
1144 trying to improve GDB's performance by caching the result of calls
1145 to calls to find_pc_partial_funtion, while at the same time
1146 find_pc_partial_function was also trying to ramp up performance by
1147 caching its most recent return value. The below makes the the
1148 function find_pc_partial_function solely responsibile for
1149 performance issues (the local cache that relied on a global
1150 variable - arrrggg - deleted).
1152 Using the testsuite and gcov, it was found that dropping the local
1153 "infrun.c" cache and instead relying on find_pc_partial_function
1154 increased the number of calls to 12000 (from 10000), but the number
1155 of times find_pc_partial_function's cache missed (this is what
1156 matters) was only increased by only 4 (to 3569). (A quick back of
1157 envelope caculation suggests that the extra 2000 function calls
1158 @1000 extra instructions per call make the 1 MIP VAX testsuite run
1159 take two extra seconds, oops :-)
1161 Long term, this function can be eliminated, replaced by the code:
1162 get_frame_type(current_frame()) == SIGTRAMP_FRAME (for new
1163 architectures this is very cheap). */
1166 pc_in_sigtramp (CORE_ADDR pc
)
1169 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
1170 return PC_IN_SIGTRAMP (pc
, name
);
1174 /* Given an execution control state that has been freshly filled in
1175 by an event from the inferior, figure out what it means and take
1176 appropriate action. */
1179 handle_inferior_event (struct execution_control_state
*ecs
)
1181 CORE_ADDR real_stop_pc
;
1182 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1183 thinking that the variable stepped_after_stopped_by_watchpoint
1184 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1185 defined in the file "config/pa/nm-hppah.h", accesses the variable
1186 indirectly. Mutter something rude about the HP merge. */
1187 int stepped_after_stopped_by_watchpoint
;
1188 int sw_single_step_trap_p
= 0;
1190 /* Cache the last pid/waitstatus. */
1191 target_last_wait_ptid
= ecs
->ptid
;
1192 target_last_waitstatus
= *ecs
->wp
;
1194 switch (ecs
->infwait_state
)
1196 case infwait_thread_hop_state
:
1197 /* Cancel the waiton_ptid. */
1198 ecs
->waiton_ptid
= pid_to_ptid (-1);
1199 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1200 is serviced in this loop, below. */
1201 if (ecs
->enable_hw_watchpoints_after_wait
)
1203 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1204 ecs
->enable_hw_watchpoints_after_wait
= 0;
1206 stepped_after_stopped_by_watchpoint
= 0;
1209 case infwait_normal_state
:
1210 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1211 is serviced in this loop, below. */
1212 if (ecs
->enable_hw_watchpoints_after_wait
)
1214 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1215 ecs
->enable_hw_watchpoints_after_wait
= 0;
1217 stepped_after_stopped_by_watchpoint
= 0;
1220 case infwait_nullified_state
:
1221 stepped_after_stopped_by_watchpoint
= 0;
1224 case infwait_nonstep_watch_state
:
1225 insert_breakpoints ();
1227 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1228 handle things like signals arriving and other things happening
1229 in combination correctly? */
1230 stepped_after_stopped_by_watchpoint
= 1;
1234 internal_error (__FILE__
, __LINE__
, "bad switch");
1236 ecs
->infwait_state
= infwait_normal_state
;
1238 flush_cached_frames ();
1240 /* If it's a new process, add it to the thread database */
1242 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1243 && !in_thread_list (ecs
->ptid
));
1245 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1246 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1248 add_thread (ecs
->ptid
);
1250 ui_out_text (uiout
, "[New ");
1251 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1252 ui_out_text (uiout
, "]\n");
1255 /* NOTE: This block is ONLY meant to be invoked in case of a
1256 "thread creation event"! If it is invoked for any other
1257 sort of event (such as a new thread landing on a breakpoint),
1258 the event will be discarded, which is almost certainly
1261 To avoid this, the low-level module (eg. target_wait)
1262 should call in_thread_list and add_thread, so that the
1263 new thread is known by the time we get here. */
1265 /* We may want to consider not doing a resume here in order
1266 to give the user a chance to play with the new thread.
1267 It might be good to make that a user-settable option. */
1269 /* At this point, all threads are stopped (happens
1270 automatically in either the OS or the native code).
1271 Therefore we need to continue all threads in order to
1274 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1275 prepare_to_wait (ecs
);
1280 switch (ecs
->ws
.kind
)
1282 case TARGET_WAITKIND_LOADED
:
1283 /* Ignore gracefully during startup of the inferior, as it
1284 might be the shell which has just loaded some objects,
1285 otherwise add the symbols for the newly loaded objects. */
1287 if (stop_soon
== NO_STOP_QUIETLY
)
1289 /* Remove breakpoints, SOLIB_ADD might adjust
1290 breakpoint addresses via breakpoint_re_set. */
1291 if (breakpoints_inserted
)
1292 remove_breakpoints ();
1294 /* Check for any newly added shared libraries if we're
1295 supposed to be adding them automatically. Switch
1296 terminal for any messages produced by
1297 breakpoint_re_set. */
1298 target_terminal_ours_for_output ();
1299 SOLIB_ADD (NULL
, 0, NULL
, auto_solib_add
);
1300 target_terminal_inferior ();
1302 /* Reinsert breakpoints and continue. */
1303 if (breakpoints_inserted
)
1304 insert_breakpoints ();
1307 resume (0, TARGET_SIGNAL_0
);
1308 prepare_to_wait (ecs
);
1311 case TARGET_WAITKIND_SPURIOUS
:
1312 resume (0, TARGET_SIGNAL_0
);
1313 prepare_to_wait (ecs
);
1316 case TARGET_WAITKIND_EXITED
:
1317 target_terminal_ours (); /* Must do this before mourn anyway */
1318 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1320 /* Record the exit code in the convenience variable $_exitcode, so
1321 that the user can inspect this again later. */
1322 set_internalvar (lookup_internalvar ("_exitcode"),
1323 value_from_longest (builtin_type_int
,
1324 (LONGEST
) ecs
->ws
.value
.integer
));
1325 gdb_flush (gdb_stdout
);
1326 target_mourn_inferior ();
1327 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1328 stop_print_frame
= 0;
1329 stop_stepping (ecs
);
1332 case TARGET_WAITKIND_SIGNALLED
:
1333 stop_print_frame
= 0;
1334 stop_signal
= ecs
->ws
.value
.sig
;
1335 target_terminal_ours (); /* Must do this before mourn anyway */
1337 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1338 reach here unless the inferior is dead. However, for years
1339 target_kill() was called here, which hints that fatal signals aren't
1340 really fatal on some systems. If that's true, then some changes
1342 target_mourn_inferior ();
1344 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1345 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1346 stop_stepping (ecs
);
1349 /* The following are the only cases in which we keep going;
1350 the above cases end in a continue or goto. */
1351 case TARGET_WAITKIND_FORKED
:
1352 case TARGET_WAITKIND_VFORKED
:
1353 stop_signal
= TARGET_SIGNAL_TRAP
;
1354 pending_follow
.kind
= ecs
->ws
.kind
;
1356 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1357 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1359 stop_pc
= read_pc ();
1361 /* Assume that catchpoints are not really software breakpoints. If
1362 some future target implements them using software breakpoints then
1363 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1364 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1365 bpstat_stop_status will not decrement the PC. */
1367 stop_bpstat
= bpstat_stop_status (&stop_pc
, 1);
1369 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1371 /* If no catchpoint triggered for this, then keep going. */
1372 if (ecs
->random_signal
)
1374 stop_signal
= TARGET_SIGNAL_0
;
1378 goto process_event_stop_test
;
1380 case TARGET_WAITKIND_EXECD
:
1381 stop_signal
= TARGET_SIGNAL_TRAP
;
1383 /* NOTE drow/2002-12-05: This code should be pushed down into the
1384 target_wait function. Until then following vfork on HP/UX 10.20
1385 is probably broken by this. Of course, it's broken anyway. */
1386 /* Is this a target which reports multiple exec events per actual
1387 call to exec()? (HP-UX using ptrace does, for example.) If so,
1388 ignore all but the last one. Just resume the exec'r, and wait
1389 for the next exec event. */
1390 if (inferior_ignoring_leading_exec_events
)
1392 inferior_ignoring_leading_exec_events
--;
1393 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1394 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1396 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1397 prepare_to_wait (ecs
);
1400 inferior_ignoring_leading_exec_events
=
1401 target_reported_exec_events_per_exec_call () - 1;
1403 pending_follow
.execd_pathname
=
1404 savestring (ecs
->ws
.value
.execd_pathname
,
1405 strlen (ecs
->ws
.value
.execd_pathname
));
1407 /* This causes the eventpoints and symbol table to be reset. Must
1408 do this now, before trying to determine whether to stop. */
1409 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1410 xfree (pending_follow
.execd_pathname
);
1412 stop_pc
= read_pc_pid (ecs
->ptid
);
1413 ecs
->saved_inferior_ptid
= inferior_ptid
;
1414 inferior_ptid
= ecs
->ptid
;
1416 /* Assume that catchpoints are not really software breakpoints. If
1417 some future target implements them using software breakpoints then
1418 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1419 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1420 bpstat_stop_status will not decrement the PC. */
1422 stop_bpstat
= bpstat_stop_status (&stop_pc
, 1);
1424 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1425 inferior_ptid
= ecs
->saved_inferior_ptid
;
1427 /* If no catchpoint triggered for this, then keep going. */
1428 if (ecs
->random_signal
)
1430 stop_signal
= TARGET_SIGNAL_0
;
1434 goto process_event_stop_test
;
1436 /* These syscall events are returned on HP-UX, as part of its
1437 implementation of page-protection-based "hardware" watchpoints.
1438 HP-UX has unfortunate interactions between page-protections and
1439 some system calls. Our solution is to disable hardware watches
1440 when a system call is entered, and reenable them when the syscall
1441 completes. The downside of this is that we may miss the precise
1442 point at which a watched piece of memory is modified. "Oh well."
1444 Note that we may have multiple threads running, which may each
1445 enter syscalls at roughly the same time. Since we don't have a
1446 good notion currently of whether a watched piece of memory is
1447 thread-private, we'd best not have any page-protections active
1448 when any thread is in a syscall. Thus, we only want to reenable
1449 hardware watches when no threads are in a syscall.
1451 Also, be careful not to try to gather much state about a thread
1452 that's in a syscall. It's frequently a losing proposition. */
1453 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1454 number_of_threads_in_syscalls
++;
1455 if (number_of_threads_in_syscalls
== 1)
1457 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1459 resume (0, TARGET_SIGNAL_0
);
1460 prepare_to_wait (ecs
);
1463 /* Before examining the threads further, step this thread to
1464 get it entirely out of the syscall. (We get notice of the
1465 event when the thread is just on the verge of exiting a
1466 syscall. Stepping one instruction seems to get it back
1469 Note that although the logical place to reenable h/w watches
1470 is here, we cannot. We cannot reenable them before stepping
1471 the thread (this causes the next wait on the thread to hang).
1473 Nor can we enable them after stepping until we've done a wait.
1474 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1475 here, which will be serviced immediately after the target
1477 case TARGET_WAITKIND_SYSCALL_RETURN
:
1478 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1480 if (number_of_threads_in_syscalls
> 0)
1482 number_of_threads_in_syscalls
--;
1483 ecs
->enable_hw_watchpoints_after_wait
=
1484 (number_of_threads_in_syscalls
== 0);
1486 prepare_to_wait (ecs
);
1489 case TARGET_WAITKIND_STOPPED
:
1490 stop_signal
= ecs
->ws
.value
.sig
;
1493 /* We had an event in the inferior, but we are not interested
1494 in handling it at this level. The lower layers have already
1495 done what needs to be done, if anything.
1497 One of the possible circumstances for this is when the
1498 inferior produces output for the console. The inferior has
1499 not stopped, and we are ignoring the event. Another possible
1500 circumstance is any event which the lower level knows will be
1501 reported multiple times without an intervening resume. */
1502 case TARGET_WAITKIND_IGNORE
:
1503 prepare_to_wait (ecs
);
1507 /* We may want to consider not doing a resume here in order to give
1508 the user a chance to play with the new thread. It might be good
1509 to make that a user-settable option. */
1511 /* At this point, all threads are stopped (happens automatically in
1512 either the OS or the native code). Therefore we need to continue
1513 all threads in order to make progress. */
1514 if (ecs
->new_thread_event
)
1516 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1517 prepare_to_wait (ecs
);
1521 stop_pc
= read_pc_pid (ecs
->ptid
);
1523 /* See if a thread hit a thread-specific breakpoint that was meant for
1524 another thread. If so, then step that thread past the breakpoint,
1527 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1529 /* Check if a regular breakpoint has been hit before checking
1530 for a potential single step breakpoint. Otherwise, GDB will
1531 not see this breakpoint hit when stepping onto breakpoints. */
1532 if (breakpoints_inserted
1533 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
1535 ecs
->random_signal
= 0;
1536 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
,
1541 /* Saw a breakpoint, but it was hit by the wrong thread.
1543 if (DECR_PC_AFTER_BREAK
)
1544 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
, ecs
->ptid
);
1546 remove_status
= remove_breakpoints ();
1547 /* Did we fail to remove breakpoints? If so, try
1548 to set the PC past the bp. (There's at least
1549 one situation in which we can fail to remove
1550 the bp's: On HP-UX's that use ttrace, we can't
1551 change the address space of a vforking child
1552 process until the child exits (well, okay, not
1553 then either :-) or execs. */
1554 if (remove_status
!= 0)
1556 /* FIXME! This is obviously non-portable! */
1557 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
+ 4, ecs
->ptid
);
1558 /* We need to restart all the threads now,
1559 * unles we're running in scheduler-locked mode.
1560 * Use currently_stepping to determine whether to
1563 /* FIXME MVS: is there any reason not to call resume()? */
1564 if (scheduler_mode
== schedlock_on
)
1565 target_resume (ecs
->ptid
,
1566 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1568 target_resume (RESUME_ALL
,
1569 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1570 prepare_to_wait (ecs
);
1575 breakpoints_inserted
= 0;
1576 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1577 context_switch (ecs
);
1578 ecs
->waiton_ptid
= ecs
->ptid
;
1579 ecs
->wp
= &(ecs
->ws
);
1580 ecs
->another_trap
= 1;
1582 ecs
->infwait_state
= infwait_thread_hop_state
;
1584 registers_changed ();
1589 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1591 /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK
1592 compared to the value it would have if the system stepping
1593 capability was used. This allows the rest of the code in
1594 this function to use this address without having to worry
1595 whether software single step is in use or not. */
1596 if (DECR_PC_AFTER_BREAK
)
1598 stop_pc
-= DECR_PC_AFTER_BREAK
;
1599 write_pc_pid (stop_pc
, ecs
->ptid
);
1602 sw_single_step_trap_p
= 1;
1603 ecs
->random_signal
= 0;
1607 ecs
->random_signal
= 1;
1609 /* See if something interesting happened to the non-current thread. If
1610 so, then switch to that thread, and eventually give control back to
1613 Note that if there's any kind of pending follow (i.e., of a fork,
1614 vfork or exec), we don't want to do this now. Rather, we'll let
1615 the next resume handle it. */
1616 if (!ptid_equal (ecs
->ptid
, inferior_ptid
) &&
1617 (pending_follow
.kind
== TARGET_WAITKIND_SPURIOUS
))
1621 /* If it's a random signal for a non-current thread, notify user
1622 if he's expressed an interest. */
1623 if (ecs
->random_signal
&& signal_print
[stop_signal
])
1625 /* ??rehrauer: I don't understand the rationale for this code. If the
1626 inferior will stop as a result of this signal, then the act of handling
1627 the stop ought to print a message that's couches the stoppage in user
1628 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1629 won't stop as a result of the signal -- i.e., if the signal is merely
1630 a side-effect of something GDB's doing "under the covers" for the
1631 user, such as stepping threads over a breakpoint they shouldn't stop
1632 for -- then the message seems to be a serious annoyance at best.
1634 For now, remove the message altogether. */
1637 target_terminal_ours_for_output ();
1638 printf_filtered ("\nProgram received signal %s, %s.\n",
1639 target_signal_to_name (stop_signal
),
1640 target_signal_to_string (stop_signal
));
1641 gdb_flush (gdb_stdout
);
1645 /* If it's not SIGTRAP and not a signal we want to stop for, then
1646 continue the thread. */
1648 if (stop_signal
!= TARGET_SIGNAL_TRAP
&& !signal_stop
[stop_signal
])
1651 target_terminal_inferior ();
1653 /* Clear the signal if it should not be passed. */
1654 if (signal_program
[stop_signal
] == 0)
1655 stop_signal
= TARGET_SIGNAL_0
;
1657 target_resume (ecs
->ptid
, 0, stop_signal
);
1658 prepare_to_wait (ecs
);
1662 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1663 and fall into the rest of wait_for_inferior(). */
1665 context_switch (ecs
);
1668 context_hook (pid_to_thread_id (ecs
->ptid
));
1670 flush_cached_frames ();
1673 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1675 /* Pull the single step breakpoints out of the target. */
1676 SOFTWARE_SINGLE_STEP (0, 0);
1677 singlestep_breakpoints_inserted_p
= 0;
1680 /* If PC is pointing at a nullified instruction, then step beyond
1681 it so that the user won't be confused when GDB appears to be ready
1684 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1685 if (INSTRUCTION_NULLIFIED
)
1687 registers_changed ();
1688 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1690 /* We may have received a signal that we want to pass to
1691 the inferior; therefore, we must not clobber the waitstatus
1694 ecs
->infwait_state
= infwait_nullified_state
;
1695 ecs
->waiton_ptid
= ecs
->ptid
;
1696 ecs
->wp
= &(ecs
->tmpstatus
);
1697 prepare_to_wait (ecs
);
1701 /* It may not be necessary to disable the watchpoint to stop over
1702 it. For example, the PA can (with some kernel cooperation)
1703 single step over a watchpoint without disabling the watchpoint. */
1704 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1707 prepare_to_wait (ecs
);
1711 /* It is far more common to need to disable a watchpoint to step
1712 the inferior over it. FIXME. What else might a debug
1713 register or page protection watchpoint scheme need here? */
1714 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1716 /* At this point, we are stopped at an instruction which has
1717 attempted to write to a piece of memory under control of
1718 a watchpoint. The instruction hasn't actually executed
1719 yet. If we were to evaluate the watchpoint expression
1720 now, we would get the old value, and therefore no change
1721 would seem to have occurred.
1723 In order to make watchpoints work `right', we really need
1724 to complete the memory write, and then evaluate the
1725 watchpoint expression. The following code does that by
1726 removing the watchpoint (actually, all watchpoints and
1727 breakpoints), single-stepping the target, re-inserting
1728 watchpoints, and then falling through to let normal
1729 single-step processing handle proceed. Since this
1730 includes evaluating watchpoints, things will come to a
1731 stop in the correct manner. */
1733 if (DECR_PC_AFTER_BREAK
)
1734 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
1736 remove_breakpoints ();
1737 registers_changed ();
1738 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1740 ecs
->waiton_ptid
= ecs
->ptid
;
1741 ecs
->wp
= &(ecs
->ws
);
1742 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1743 prepare_to_wait (ecs
);
1747 /* It may be possible to simply continue after a watchpoint. */
1748 if (HAVE_CONTINUABLE_WATCHPOINT
)
1749 STOPPED_BY_WATCHPOINT (ecs
->ws
);
1751 ecs
->stop_func_start
= 0;
1752 ecs
->stop_func_end
= 0;
1753 ecs
->stop_func_name
= 0;
1754 /* Don't care about return value; stop_func_start and stop_func_name
1755 will both be 0 if it doesn't work. */
1756 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1757 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1758 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
1759 ecs
->another_trap
= 0;
1760 bpstat_clear (&stop_bpstat
);
1762 stop_stack_dummy
= 0;
1763 stop_print_frame
= 1;
1764 ecs
->random_signal
= 0;
1765 stopped_by_random_signal
= 0;
1766 breakpoints_failed
= 0;
1768 /* Look at the cause of the stop, and decide what to do.
1769 The alternatives are:
1770 1) break; to really stop and return to the debugger,
1771 2) drop through to start up again
1772 (set ecs->another_trap to 1 to single step once)
1773 3) set ecs->random_signal to 1, and the decision between 1 and 2
1774 will be made according to the signal handling tables. */
1776 /* First, distinguish signals caused by the debugger from signals
1777 that have to do with the program's own actions.
1778 Note that breakpoint insns may cause SIGTRAP or SIGILL
1779 or SIGEMT, depending on the operating system version.
1780 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1781 and change it to SIGTRAP. */
1783 if (stop_signal
== TARGET_SIGNAL_TRAP
1784 || (breakpoints_inserted
&&
1785 (stop_signal
== TARGET_SIGNAL_ILL
1786 || stop_signal
== TARGET_SIGNAL_EMT
))
1787 || stop_soon
== STOP_QUIETLY
1788 || stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1790 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1792 stop_print_frame
= 0;
1793 stop_stepping (ecs
);
1797 /* This is originated from start_remote(), start_inferior() and
1798 shared libraries hook functions. */
1799 if (stop_soon
== STOP_QUIETLY
)
1801 stop_stepping (ecs
);
1805 /* This originates from attach_command(). We need to overwrite
1806 the stop_signal here, because some kernels don't ignore a
1807 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1808 See more comments in inferior.h. */
1809 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1811 stop_stepping (ecs
);
1812 if (stop_signal
== TARGET_SIGNAL_STOP
)
1813 stop_signal
= TARGET_SIGNAL_0
;
1817 /* Don't even think about breakpoints
1818 if just proceeded over a breakpoint.
1820 However, if we are trying to proceed over a breakpoint
1821 and end up in sigtramp, then through_sigtramp_breakpoint
1822 will be set and we should check whether we've hit the
1824 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
1825 && through_sigtramp_breakpoint
== NULL
)
1826 bpstat_clear (&stop_bpstat
);
1829 /* See if there is a breakpoint at the current PC. */
1831 /* The second argument of bpstat_stop_status is meant to help
1832 distinguish between a breakpoint trap and a singlestep trap.
1833 This is only important on targets where DECR_PC_AFTER_BREAK
1834 is non-zero. The prev_pc test is meant to distinguish between
1835 singlestepping a trap instruction, and singlestepping thru a
1836 jump to the instruction following a trap instruction.
1838 Therefore, pass TRUE if our reason for stopping is
1839 something other than hitting a breakpoint. We do this by
1840 checking that either: we detected earlier a software single
1841 step trap or, 1) stepping is going on and 2) we didn't hit
1842 a breakpoint in a signal handler without an intervening stop
1843 in sigtramp, which is detected by a new stack pointer value
1844 below any usual function calling stack adjustments. */
1848 sw_single_step_trap_p
1849 || (currently_stepping (ecs
)
1850 && prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
1852 && INNER_THAN (read_sp (), (step_sp
- 16)))));
1853 /* Following in case break condition called a
1855 stop_print_frame
= 1;
1858 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1859 at one stage in the past included checks for an inferior
1860 function call's call dummy's return breakpoint. The original
1861 comment, that went with the test, read:
1863 ``End of a stack dummy. Some systems (e.g. Sony news) give
1864 another signal besides SIGTRAP, so check here as well as
1867 If someone ever tries to get get call dummys on a
1868 non-executable stack to work (where the target would stop
1869 with something like a SIGSEG), then those tests might need to
1870 be re-instated. Given, however, that the tests were only
1871 enabled when momentary breakpoints were not being used, I
1872 suspect that it won't be the case. */
1874 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1876 = !(bpstat_explains_signal (stop_bpstat
)
1878 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1881 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1882 if (!ecs
->random_signal
)
1883 stop_signal
= TARGET_SIGNAL_TRAP
;
1887 /* When we reach this point, we've pretty much decided
1888 that the reason for stopping must've been a random
1889 (unexpected) signal. */
1892 ecs
->random_signal
= 1;
1894 process_event_stop_test
:
1895 /* For the program's own signals, act according to
1896 the signal handling tables. */
1898 if (ecs
->random_signal
)
1900 /* Signal not for debugging purposes. */
1903 stopped_by_random_signal
= 1;
1905 if (signal_print
[stop_signal
])
1908 target_terminal_ours_for_output ();
1909 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1911 if (signal_stop
[stop_signal
])
1913 stop_stepping (ecs
);
1916 /* If not going to stop, give terminal back
1917 if we took it away. */
1919 target_terminal_inferior ();
1921 /* Clear the signal if it should not be passed. */
1922 if (signal_program
[stop_signal
] == 0)
1923 stop_signal
= TARGET_SIGNAL_0
;
1925 /* I'm not sure whether this needs to be check_sigtramp2 or
1926 whether it could/should be keep_going.
1928 This used to jump to step_over_function if we are stepping,
1931 Suppose the user does a `next' over a function call, and while
1932 that call is in progress, the inferior receives a signal for
1933 which GDB does not stop (i.e., signal_stop[SIG] is false). In
1934 that case, when we reach this point, there is already a
1935 step-resume breakpoint established, right where it should be:
1936 immediately after the function call the user is "next"-ing
1937 over. If we call step_over_function now, two bad things
1940 - we'll create a new breakpoint, at wherever the current
1941 frame's return address happens to be. That could be
1942 anywhere, depending on what function call happens to be on
1943 the top of the stack at that point. Point is, it's probably
1944 not where we need it.
1946 - the existing step-resume breakpoint (which is at the correct
1947 address) will get orphaned: step_resume_breakpoint will point
1948 to the new breakpoint, and the old step-resume breakpoint
1949 will never be cleaned up.
1951 The old behavior was meant to help HP-UX single-step out of
1952 sigtramps. It would place the new breakpoint at prev_pc, which
1953 was certainly wrong. I don't know the details there, so fixing
1954 this probably breaks that. As with anything else, it's up to
1955 the HP-UX maintainer to furnish a fix that doesn't break other
1956 platforms. --JimB, 20 May 1999 */
1957 check_sigtramp2 (ecs
);
1962 /* Handle cases caused by hitting a breakpoint. */
1964 CORE_ADDR jmp_buf_pc
;
1965 struct bpstat_what what
;
1967 what
= bpstat_what (stop_bpstat
);
1969 if (what
.call_dummy
)
1971 stop_stack_dummy
= 1;
1973 trap_expected_after_continue
= 1;
1977 switch (what
.main_action
)
1979 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
1980 /* If we hit the breakpoint at longjmp, disable it for the
1981 duration of this command. Then, install a temporary
1982 breakpoint at the target of the jmp_buf. */
1983 disable_longjmp_breakpoint ();
1984 remove_breakpoints ();
1985 breakpoints_inserted
= 0;
1986 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
1992 /* Need to blow away step-resume breakpoint, as it
1993 interferes with us */
1994 if (step_resume_breakpoint
!= NULL
)
1996 delete_step_resume_breakpoint (&step_resume_breakpoint
);
1998 /* Not sure whether we need to blow this away too, but probably
1999 it is like the step-resume breakpoint. */
2000 if (through_sigtramp_breakpoint
!= NULL
)
2002 delete_breakpoint (through_sigtramp_breakpoint
);
2003 through_sigtramp_breakpoint
= NULL
;
2007 /* FIXME - Need to implement nested temporary breakpoints */
2008 if (step_over_calls
> 0)
2009 set_longjmp_resume_breakpoint (jmp_buf_pc
, get_current_frame ());
2012 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2013 ecs
->handling_longjmp
= 1; /* FIXME */
2017 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2018 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2019 remove_breakpoints ();
2020 breakpoints_inserted
= 0;
2022 /* FIXME - Need to implement nested temporary breakpoints */
2024 && (frame_id_inner (get_frame_id (get_current_frame ()),
2027 ecs
->another_trap
= 1;
2032 disable_longjmp_breakpoint ();
2033 ecs
->handling_longjmp
= 0; /* FIXME */
2034 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2036 /* else fallthrough */
2038 case BPSTAT_WHAT_SINGLE
:
2039 if (breakpoints_inserted
)
2041 remove_breakpoints ();
2043 breakpoints_inserted
= 0;
2044 ecs
->another_trap
= 1;
2045 /* Still need to check other stuff, at least the case
2046 where we are stepping and step out of the right range. */
2049 case BPSTAT_WHAT_STOP_NOISY
:
2050 stop_print_frame
= 1;
2052 /* We are about to nuke the step_resume_breakpoint and
2053 through_sigtramp_breakpoint via the cleanup chain, so
2054 no need to worry about it here. */
2056 stop_stepping (ecs
);
2059 case BPSTAT_WHAT_STOP_SILENT
:
2060 stop_print_frame
= 0;
2062 /* We are about to nuke the step_resume_breakpoint and
2063 through_sigtramp_breakpoint via the cleanup chain, so
2064 no need to worry about it here. */
2066 stop_stepping (ecs
);
2069 case BPSTAT_WHAT_STEP_RESUME
:
2070 /* This proably demands a more elegant solution, but, yeah
2073 This function's use of the simple variable
2074 step_resume_breakpoint doesn't seem to accomodate
2075 simultaneously active step-resume bp's, although the
2076 breakpoint list certainly can.
2078 If we reach here and step_resume_breakpoint is already
2079 NULL, then apparently we have multiple active
2080 step-resume bp's. We'll just delete the breakpoint we
2081 stopped at, and carry on.
2083 Correction: what the code currently does is delete a
2084 step-resume bp, but it makes no effort to ensure that
2085 the one deleted is the one currently stopped at. MVS */
2087 if (step_resume_breakpoint
== NULL
)
2089 step_resume_breakpoint
=
2090 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2092 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2095 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2096 if (through_sigtramp_breakpoint
)
2097 delete_breakpoint (through_sigtramp_breakpoint
);
2098 through_sigtramp_breakpoint
= NULL
;
2100 /* If were waiting for a trap, hitting the step_resume_break
2101 doesn't count as getting it. */
2103 ecs
->another_trap
= 1;
2106 case BPSTAT_WHAT_CHECK_SHLIBS
:
2107 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2110 /* Remove breakpoints, we eventually want to step over the
2111 shlib event breakpoint, and SOLIB_ADD might adjust
2112 breakpoint addresses via breakpoint_re_set. */
2113 if (breakpoints_inserted
)
2114 remove_breakpoints ();
2115 breakpoints_inserted
= 0;
2117 /* Check for any newly added shared libraries if we're
2118 supposed to be adding them automatically. Switch
2119 terminal for any messages produced by
2120 breakpoint_re_set. */
2121 target_terminal_ours_for_output ();
2122 SOLIB_ADD (NULL
, 0, NULL
, auto_solib_add
);
2123 target_terminal_inferior ();
2125 /* Try to reenable shared library breakpoints, additional
2126 code segments in shared libraries might be mapped in now. */
2127 re_enable_breakpoints_in_shlibs ();
2129 /* If requested, stop when the dynamic linker notifies
2130 gdb of events. This allows the user to get control
2131 and place breakpoints in initializer routines for
2132 dynamically loaded objects (among other things). */
2133 if (stop_on_solib_events
)
2135 stop_stepping (ecs
);
2139 /* If we stopped due to an explicit catchpoint, then the
2140 (see above) call to SOLIB_ADD pulled in any symbols
2141 from a newly-loaded library, if appropriate.
2143 We do want the inferior to stop, but not where it is
2144 now, which is in the dynamic linker callback. Rather,
2145 we would like it stop in the user's program, just after
2146 the call that caused this catchpoint to trigger. That
2147 gives the user a more useful vantage from which to
2148 examine their program's state. */
2149 else if (what
.main_action
==
2150 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2152 /* ??rehrauer: If I could figure out how to get the
2153 right return PC from here, we could just set a temp
2154 breakpoint and resume. I'm not sure we can without
2155 cracking open the dld's shared libraries and sniffing
2156 their unwind tables and text/data ranges, and that's
2157 not a terribly portable notion.
2159 Until that time, we must step the inferior out of the
2160 dld callback, and also out of the dld itself (and any
2161 code or stubs in libdld.sl, such as "shl_load" and
2162 friends) until we reach non-dld code. At that point,
2163 we can stop stepping. */
2164 bpstat_get_triggered_catchpoints (stop_bpstat
,
2166 stepping_through_solib_catchpoints
);
2167 ecs
->stepping_through_solib_after_catch
= 1;
2169 /* Be sure to lift all breakpoints, so the inferior does
2170 actually step past this point... */
2171 ecs
->another_trap
= 1;
2176 /* We want to step over this breakpoint, then keep going. */
2177 ecs
->another_trap
= 1;
2184 case BPSTAT_WHAT_LAST
:
2185 /* Not a real code, but listed here to shut up gcc -Wall. */
2187 case BPSTAT_WHAT_KEEP_CHECKING
:
2192 /* We come here if we hit a breakpoint but should not
2193 stop for it. Possibly we also were stepping
2194 and should stop for that. So fall through and
2195 test for stepping. But, if not stepping,
2198 /* Are we stepping to get the inferior out of the dynamic
2199 linker's hook (and possibly the dld itself) after catching
2201 if (ecs
->stepping_through_solib_after_catch
)
2203 #if defined(SOLIB_ADD)
2204 /* Have we reached our destination? If not, keep going. */
2205 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2207 ecs
->another_trap
= 1;
2212 /* Else, stop and report the catchpoint(s) whose triggering
2213 caused us to begin stepping. */
2214 ecs
->stepping_through_solib_after_catch
= 0;
2215 bpstat_clear (&stop_bpstat
);
2216 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2217 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2218 stop_print_frame
= 1;
2219 stop_stepping (ecs
);
2223 if (step_resume_breakpoint
)
2225 /* Having a step-resume breakpoint overrides anything
2226 else having to do with stepping commands until
2227 that breakpoint is reached. */
2228 /* I'm not sure whether this needs to be check_sigtramp2 or
2229 whether it could/should be keep_going. */
2230 check_sigtramp2 (ecs
);
2235 if (step_range_end
== 0)
2237 /* Likewise if we aren't even stepping. */
2238 /* I'm not sure whether this needs to be check_sigtramp2 or
2239 whether it could/should be keep_going. */
2240 check_sigtramp2 (ecs
);
2245 /* If stepping through a line, keep going if still within it.
2247 Note that step_range_end is the address of the first instruction
2248 beyond the step range, and NOT the address of the last instruction
2250 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2252 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2253 So definately need to check for sigtramp here. */
2254 check_sigtramp2 (ecs
);
2259 /* We stepped out of the stepping range. */
2261 /* If we are stepping at the source level and entered the runtime
2262 loader dynamic symbol resolution code, we keep on single stepping
2263 until we exit the run time loader code and reach the callee's
2265 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2266 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2268 CORE_ADDR pc_after_resolver
= SKIP_SOLIB_RESOLVER (stop_pc
);
2270 if (pc_after_resolver
)
2272 /* Set up a step-resume breakpoint at the address
2273 indicated by SKIP_SOLIB_RESOLVER. */
2274 struct symtab_and_line sr_sal
;
2276 sr_sal
.pc
= pc_after_resolver
;
2278 check_for_old_step_resume_breakpoint ();
2279 step_resume_breakpoint
=
2280 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2281 if (breakpoints_inserted
)
2282 insert_breakpoints ();
2289 /* We can't update step_sp every time through the loop, because
2290 reading the stack pointer would slow down stepping too much.
2291 But we can update it every time we leave the step range. */
2292 ecs
->update_step_sp
= 1;
2294 /* Did we just take a signal? */
2295 if (pc_in_sigtramp (stop_pc
)
2296 && !pc_in_sigtramp (prev_pc
)
2297 && INNER_THAN (read_sp (), step_sp
))
2299 /* We've just taken a signal; go until we are back to
2300 the point where we took it and one more. */
2302 /* Note: The test above succeeds not only when we stepped
2303 into a signal handler, but also when we step past the last
2304 statement of a signal handler and end up in the return stub
2305 of the signal handler trampoline. To distinguish between
2306 these two cases, check that the frame is INNER_THAN the
2307 previous one below. pai/1997-09-11 */
2311 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2313 if (frame_id_inner (current_frame
, step_frame_id
))
2315 /* We have just taken a signal; go until we are back to
2316 the point where we took it and one more. */
2318 /* This code is needed at least in the following case:
2319 The user types "next" and then a signal arrives (before
2320 the "next" is done). */
2322 /* Note that if we are stopped at a breakpoint, then we need
2323 the step_resume breakpoint to override any breakpoints at
2324 the same location, so that we will still step over the
2325 breakpoint even though the signal happened. */
2326 struct symtab_and_line sr_sal
;
2329 sr_sal
.symtab
= NULL
;
2331 sr_sal
.pc
= prev_pc
;
2332 /* We could probably be setting the frame to
2333 step_frame_id; I don't think anyone thought to try it. */
2334 check_for_old_step_resume_breakpoint ();
2335 step_resume_breakpoint
=
2336 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2337 if (breakpoints_inserted
)
2338 insert_breakpoints ();
2342 /* We just stepped out of a signal handler and into
2343 its calling trampoline.
2345 Normally, we'd call step_over_function from
2346 here, but for some reason GDB can't unwind the
2347 stack correctly to find the real PC for the point
2348 user code where the signal trampoline will return
2349 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2350 But signal trampolines are pretty small stubs of
2351 code, anyway, so it's OK instead to just
2352 single-step out. Note: assuming such trampolines
2353 don't exhibit recursion on any platform... */
2354 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2355 &ecs
->stop_func_start
,
2356 &ecs
->stop_func_end
);
2357 /* Readjust stepping range */
2358 step_range_start
= ecs
->stop_func_start
;
2359 step_range_end
= ecs
->stop_func_end
;
2360 ecs
->stepping_through_sigtramp
= 1;
2365 /* If this is stepi or nexti, make sure that the stepping range
2366 gets us past that instruction. */
2367 if (step_range_end
== 1)
2368 /* FIXME: Does this run afoul of the code below which, if
2369 we step into the middle of a line, resets the stepping
2371 step_range_end
= (step_range_start
= prev_pc
) + 1;
2373 ecs
->remove_breakpoints_on_following_step
= 1;
2378 if (stop_pc
== ecs
->stop_func_start
/* Quick test */
2379 || (in_prologue (stop_pc
, ecs
->stop_func_start
) &&
2380 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2381 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
)
2382 || ecs
->stop_func_name
== 0)
2384 /* It's a subroutine call. */
2386 if ((step_over_calls
== STEP_OVER_NONE
)
2387 || ((step_range_end
== 1)
2388 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2390 /* I presume that step_over_calls is only 0 when we're
2391 supposed to be stepping at the assembly language level
2392 ("stepi"). Just stop. */
2393 /* Also, maybe we just did a "nexti" inside a prolog,
2394 so we thought it was a subroutine call but it was not.
2395 Stop as well. FENN */
2397 print_stop_reason (END_STEPPING_RANGE
, 0);
2398 stop_stepping (ecs
);
2402 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
2404 /* We're doing a "next". */
2406 if (pc_in_sigtramp (stop_pc
)
2407 && frame_id_inner (step_frame_id
,
2408 frame_id_build (read_sp (), 0)))
2409 /* We stepped out of a signal handler, and into its
2410 calling trampoline. This is misdetected as a
2411 subroutine call, but stepping over the signal
2412 trampoline isn't such a bad idea. In order to do that,
2413 we have to ignore the value in step_frame_id, since
2414 that doesn't represent the frame that'll reach when we
2415 return from the signal trampoline. Otherwise we'll
2416 probably continue to the end of the program. */
2417 step_frame_id
= null_frame_id
;
2419 step_over_function (ecs
);
2424 /* If we are in a function call trampoline (a stub between
2425 the calling routine and the real function), locate the real
2426 function. That's what tells us (a) whether we want to step
2427 into it at all, and (b) what prologue we want to run to
2428 the end of, if we do step into it. */
2429 real_stop_pc
= skip_language_trampoline (stop_pc
);
2430 if (real_stop_pc
== 0)
2431 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2432 if (real_stop_pc
!= 0)
2433 ecs
->stop_func_start
= real_stop_pc
;
2435 /* If we have line number information for the function we
2436 are thinking of stepping into, step into it.
2438 If there are several symtabs at that PC (e.g. with include
2439 files), just want to know whether *any* of them have line
2440 numbers. find_pc_line handles this. */
2442 struct symtab_and_line tmp_sal
;
2444 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2445 if (tmp_sal
.line
!= 0)
2447 step_into_function (ecs
);
2452 /* If we have no line number and the step-stop-if-no-debug
2453 is set, we stop the step so that the user has a chance to
2454 switch in assembly mode. */
2455 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2458 print_stop_reason (END_STEPPING_RANGE
, 0);
2459 stop_stepping (ecs
);
2463 step_over_function (ecs
);
2469 /* We've wandered out of the step range. */
2471 ecs
->sal
= find_pc_line (stop_pc
, 0);
2473 if (step_range_end
== 1)
2475 /* It is stepi or nexti. We always want to stop stepping after
2478 print_stop_reason (END_STEPPING_RANGE
, 0);
2479 stop_stepping (ecs
);
2483 /* If we're in the return path from a shared library trampoline,
2484 we want to proceed through the trampoline when stepping. */
2485 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2487 /* Determine where this trampoline returns. */
2488 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2490 /* Only proceed through if we know where it's going. */
2493 /* And put the step-breakpoint there and go until there. */
2494 struct symtab_and_line sr_sal
;
2496 init_sal (&sr_sal
); /* initialize to zeroes */
2497 sr_sal
.pc
= real_stop_pc
;
2498 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2499 /* Do not specify what the fp should be when we stop
2500 since on some machines the prologue
2501 is where the new fp value is established. */
2502 check_for_old_step_resume_breakpoint ();
2503 step_resume_breakpoint
=
2504 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2505 if (breakpoints_inserted
)
2506 insert_breakpoints ();
2508 /* Restart without fiddling with the step ranges or
2515 if (ecs
->sal
.line
== 0)
2517 /* We have no line number information. That means to stop
2518 stepping (does this always happen right after one instruction,
2519 when we do "s" in a function with no line numbers,
2520 or can this happen as a result of a return or longjmp?). */
2522 print_stop_reason (END_STEPPING_RANGE
, 0);
2523 stop_stepping (ecs
);
2527 if ((stop_pc
== ecs
->sal
.pc
)
2528 && (ecs
->current_line
!= ecs
->sal
.line
2529 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2531 /* We are at the start of a different line. So stop. Note that
2532 we don't stop if we step into the middle of a different line.
2533 That is said to make things like for (;;) statements work
2536 print_stop_reason (END_STEPPING_RANGE
, 0);
2537 stop_stepping (ecs
);
2541 /* We aren't done stepping.
2543 Optimize by setting the stepping range to the line.
2544 (We might not be in the original line, but if we entered a
2545 new line in mid-statement, we continue stepping. This makes
2546 things like for(;;) statements work better.) */
2548 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2550 /* If this is the last line of the function, don't keep stepping
2551 (it would probably step us out of the function).
2552 This is particularly necessary for a one-line function,
2553 in which after skipping the prologue we better stop even though
2554 we will be in mid-line. */
2556 print_stop_reason (END_STEPPING_RANGE
, 0);
2557 stop_stepping (ecs
);
2560 step_range_start
= ecs
->sal
.pc
;
2561 step_range_end
= ecs
->sal
.end
;
2562 step_frame_id
= get_frame_id (get_current_frame ());
2563 ecs
->current_line
= ecs
->sal
.line
;
2564 ecs
->current_symtab
= ecs
->sal
.symtab
;
2566 /* In the case where we just stepped out of a function into the
2567 middle of a line of the caller, continue stepping, but
2568 step_frame_id must be modified to current frame */
2570 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2571 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2572 step_frame_id
= current_frame
;
2578 /* Are we in the middle of stepping? */
2581 currently_stepping (struct execution_control_state
*ecs
)
2583 return ((through_sigtramp_breakpoint
== NULL
2584 && !ecs
->handling_longjmp
2585 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2587 || ecs
->stepping_through_solib_after_catch
2588 || bpstat_should_step ());
2592 check_sigtramp2 (struct execution_control_state
*ecs
)
2595 && pc_in_sigtramp (stop_pc
)
2596 && !pc_in_sigtramp (prev_pc
)
2597 && INNER_THAN (read_sp (), step_sp
))
2599 /* What has happened here is that we have just stepped the
2600 inferior with a signal (because it is a signal which
2601 shouldn't make us stop), thus stepping into sigtramp.
2603 So we need to set a step_resume_break_address breakpoint and
2604 continue until we hit it, and then step. FIXME: This should
2605 be more enduring than a step_resume breakpoint; we should
2606 know that we will later need to keep going rather than
2607 re-hitting the breakpoint here (see the testsuite,
2608 gdb.base/signals.exp where it says "exceedingly difficult"). */
2610 struct symtab_and_line sr_sal
;
2612 init_sal (&sr_sal
); /* initialize to zeroes */
2613 sr_sal
.pc
= prev_pc
;
2614 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2615 /* We perhaps could set the frame if we kept track of what the
2616 frame corresponding to prev_pc was. But we don't, so don't. */
2617 through_sigtramp_breakpoint
=
2618 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_through_sigtramp
);
2619 if (breakpoints_inserted
)
2620 insert_breakpoints ();
2622 ecs
->remove_breakpoints_on_following_step
= 1;
2623 ecs
->another_trap
= 1;
2627 /* Subroutine call with source code we should not step over. Do step
2628 to the first line of code in it. */
2631 step_into_function (struct execution_control_state
*ecs
)
2634 struct symtab_and_line sr_sal
;
2636 s
= find_pc_symtab (stop_pc
);
2637 if (s
&& s
->language
!= language_asm
)
2638 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2640 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2641 /* Use the step_resume_break to step until the end of the prologue,
2642 even if that involves jumps (as it seems to on the vax under
2644 /* If the prologue ends in the middle of a source line, continue to
2645 the end of that source line (if it is still within the function).
2646 Otherwise, just go to end of prologue. */
2647 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2648 /* no, don't either. It skips any code that's legitimately on the
2652 && ecs
->sal
.pc
!= ecs
->stop_func_start
2653 && ecs
->sal
.end
< ecs
->stop_func_end
)
2654 ecs
->stop_func_start
= ecs
->sal
.end
;
2657 if (ecs
->stop_func_start
== stop_pc
)
2659 /* We are already there: stop now. */
2661 print_stop_reason (END_STEPPING_RANGE
, 0);
2662 stop_stepping (ecs
);
2667 /* Put the step-breakpoint there and go until there. */
2668 init_sal (&sr_sal
); /* initialize to zeroes */
2669 sr_sal
.pc
= ecs
->stop_func_start
;
2670 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2671 /* Do not specify what the fp should be when we stop since on
2672 some machines the prologue is where the new fp value is
2674 check_for_old_step_resume_breakpoint ();
2675 step_resume_breakpoint
=
2676 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2677 if (breakpoints_inserted
)
2678 insert_breakpoints ();
2680 /* And make sure stepping stops right away then. */
2681 step_range_end
= step_range_start
;
2686 /* We've just entered a callee, and we wish to resume until it returns
2687 to the caller. Setting a step_resume breakpoint on the return
2688 address will catch a return from the callee.
2690 However, if the callee is recursing, we want to be careful not to
2691 catch returns of those recursive calls, but only of THIS instance
2694 To do this, we set the step_resume bp's frame to our current
2695 caller's frame (step_frame_id, which is set by the "next" or
2696 "until" command, before execution begins). */
2699 step_over_function (struct execution_control_state
*ecs
)
2701 struct symtab_and_line sr_sal
;
2703 init_sal (&sr_sal
); /* initialize to zeros */
2705 /* NOTE: cagney/2003-04-06:
2707 At this point the equality get_frame_pc() == get_frame_func()
2708 should hold. This may make it possible for this code to tell the
2709 frame where it's function is, instead of the reverse. This would
2710 avoid the need to search for the frame's function, which can get
2711 very messy when there is no debug info available (look at the
2712 heuristic find pc start code found in targets like the MIPS). */
2714 /* NOTE: cagney/2003-04-06:
2716 The intent of DEPRECATED_SAVED_PC_AFTER_CALL was to:
2718 - provide a very light weight equivalent to frame_unwind_pc()
2719 (nee FRAME_SAVED_PC) that avoids the prologue analyzer
2721 - avoid handling the case where the PC hasn't been saved in the
2724 Unfortunatly, not five lines further down, is a call to
2725 get_frame_id() and that is guarenteed to trigger the prologue
2728 The `correct fix' is for the prologe analyzer to handle the case
2729 where the prologue is incomplete (PC in prologue) and,
2730 consequently, the return pc has not yet been saved. It should be
2731 noted that the prologue analyzer needs to handle this case
2732 anyway: frameless leaf functions that don't save the return PC;
2733 single stepping through a prologue.
2735 The d10v handles all this by bailing out of the prologue analsis
2736 when it reaches the current instruction. */
2738 if (DEPRECATED_SAVED_PC_AFTER_CALL_P ())
2739 sr_sal
.pc
= ADDR_BITS_REMOVE (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ()));
2741 sr_sal
.pc
= ADDR_BITS_REMOVE (frame_pc_unwind (get_current_frame ()));
2742 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2744 check_for_old_step_resume_breakpoint ();
2745 step_resume_breakpoint
=
2746 set_momentary_breakpoint (sr_sal
, get_frame_id (get_current_frame ()),
2749 if (frame_id_p (step_frame_id
)
2750 && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal
.pc
))
2751 step_resume_breakpoint
->frame_id
= step_frame_id
;
2753 if (breakpoints_inserted
)
2754 insert_breakpoints ();
2758 stop_stepping (struct execution_control_state
*ecs
)
2760 if (target_has_execution
)
2762 /* Assuming the inferior still exists, set these up for next
2763 time, just like we did above if we didn't break out of the
2765 prev_pc
= read_pc ();
2768 /* Let callers know we don't want to wait for the inferior anymore. */
2769 ecs
->wait_some_more
= 0;
2772 /* This function handles various cases where we need to continue
2773 waiting for the inferior. */
2774 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2777 keep_going (struct execution_control_state
*ecs
)
2779 /* Save the pc before execution, to compare with pc after stop. */
2780 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2782 if (ecs
->update_step_sp
)
2783 step_sp
= read_sp ();
2784 ecs
->update_step_sp
= 0;
2786 /* If we did not do break;, it means we should keep running the
2787 inferior and not return to debugger. */
2789 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2791 /* We took a signal (which we are supposed to pass through to
2792 the inferior, else we'd have done a break above) and we
2793 haven't yet gotten our trap. Simply continue. */
2794 resume (currently_stepping (ecs
), stop_signal
);
2798 /* Either the trap was not expected, but we are continuing
2799 anyway (the user asked that this signal be passed to the
2802 The signal was SIGTRAP, e.g. it was our signal, but we
2803 decided we should resume from it.
2805 We're going to run this baby now!
2807 Insert breakpoints now, unless we are trying to one-proceed
2808 past a breakpoint. */
2809 /* If we've just finished a special step resume and we don't
2810 want to hit a breakpoint, pull em out. */
2811 if (step_resume_breakpoint
== NULL
2812 && through_sigtramp_breakpoint
== NULL
2813 && ecs
->remove_breakpoints_on_following_step
)
2815 ecs
->remove_breakpoints_on_following_step
= 0;
2816 remove_breakpoints ();
2817 breakpoints_inserted
= 0;
2819 else if (!breakpoints_inserted
&&
2820 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
2822 breakpoints_failed
= insert_breakpoints ();
2823 if (breakpoints_failed
)
2825 stop_stepping (ecs
);
2828 breakpoints_inserted
= 1;
2831 trap_expected
= ecs
->another_trap
;
2833 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2834 specifies that such a signal should be delivered to the
2837 Typically, this would occure when a user is debugging a
2838 target monitor on a simulator: the target monitor sets a
2839 breakpoint; the simulator encounters this break-point and
2840 halts the simulation handing control to GDB; GDB, noteing
2841 that the break-point isn't valid, returns control back to the
2842 simulator; the simulator then delivers the hardware
2843 equivalent of a SIGNAL_TRAP to the program being debugged. */
2845 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2846 stop_signal
= TARGET_SIGNAL_0
;
2848 #ifdef SHIFT_INST_REGS
2849 /* I'm not sure when this following segment applies. I do know,
2850 now, that we shouldn't rewrite the regs when we were stopped
2851 by a random signal from the inferior process. */
2852 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2853 (this is only used on the 88k). */
2855 if (!bpstat_explains_signal (stop_bpstat
)
2856 && (stop_signal
!= TARGET_SIGNAL_CHLD
) && !stopped_by_random_signal
)
2858 #endif /* SHIFT_INST_REGS */
2860 resume (currently_stepping (ecs
), stop_signal
);
2863 prepare_to_wait (ecs
);
2866 /* This function normally comes after a resume, before
2867 handle_inferior_event exits. It takes care of any last bits of
2868 housekeeping, and sets the all-important wait_some_more flag. */
2871 prepare_to_wait (struct execution_control_state
*ecs
)
2873 if (ecs
->infwait_state
== infwait_normal_state
)
2875 overlay_cache_invalid
= 1;
2877 /* We have to invalidate the registers BEFORE calling
2878 target_wait because they can be loaded from the target while
2879 in target_wait. This makes remote debugging a bit more
2880 efficient for those targets that provide critical registers
2881 as part of their normal status mechanism. */
2883 registers_changed ();
2884 ecs
->waiton_ptid
= pid_to_ptid (-1);
2885 ecs
->wp
= &(ecs
->ws
);
2887 /* This is the old end of the while loop. Let everybody know we
2888 want to wait for the inferior some more and get called again
2890 ecs
->wait_some_more
= 1;
2893 /* Print why the inferior has stopped. We always print something when
2894 the inferior exits, or receives a signal. The rest of the cases are
2895 dealt with later on in normal_stop() and print_it_typical(). Ideally
2896 there should be a call to this function from handle_inferior_event()
2897 each time stop_stepping() is called.*/
2899 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2901 switch (stop_reason
)
2904 /* We don't deal with these cases from handle_inferior_event()
2907 case END_STEPPING_RANGE
:
2908 /* We are done with a step/next/si/ni command. */
2909 /* For now print nothing. */
2910 /* Print a message only if not in the middle of doing a "step n"
2911 operation for n > 1 */
2912 if (!step_multi
|| !stop_step
)
2913 if (ui_out_is_mi_like_p (uiout
))
2914 ui_out_field_string (uiout
, "reason", "end-stepping-range");
2916 case BREAKPOINT_HIT
:
2917 /* We found a breakpoint. */
2918 /* For now print nothing. */
2921 /* The inferior was terminated by a signal. */
2922 annotate_signalled ();
2923 if (ui_out_is_mi_like_p (uiout
))
2924 ui_out_field_string (uiout
, "reason", "exited-signalled");
2925 ui_out_text (uiout
, "\nProgram terminated with signal ");
2926 annotate_signal_name ();
2927 ui_out_field_string (uiout
, "signal-name",
2928 target_signal_to_name (stop_info
));
2929 annotate_signal_name_end ();
2930 ui_out_text (uiout
, ", ");
2931 annotate_signal_string ();
2932 ui_out_field_string (uiout
, "signal-meaning",
2933 target_signal_to_string (stop_info
));
2934 annotate_signal_string_end ();
2935 ui_out_text (uiout
, ".\n");
2936 ui_out_text (uiout
, "The program no longer exists.\n");
2939 /* The inferior program is finished. */
2940 annotate_exited (stop_info
);
2943 if (ui_out_is_mi_like_p (uiout
))
2944 ui_out_field_string (uiout
, "reason", "exited");
2945 ui_out_text (uiout
, "\nProgram exited with code ");
2946 ui_out_field_fmt (uiout
, "exit-code", "0%o",
2947 (unsigned int) stop_info
);
2948 ui_out_text (uiout
, ".\n");
2952 if (ui_out_is_mi_like_p (uiout
))
2953 ui_out_field_string (uiout
, "reason", "exited-normally");
2954 ui_out_text (uiout
, "\nProgram exited normally.\n");
2957 case SIGNAL_RECEIVED
:
2958 /* Signal received. The signal table tells us to print about
2961 ui_out_text (uiout
, "\nProgram received signal ");
2962 annotate_signal_name ();
2963 if (ui_out_is_mi_like_p (uiout
))
2964 ui_out_field_string (uiout
, "reason", "signal-received");
2965 ui_out_field_string (uiout
, "signal-name",
2966 target_signal_to_name (stop_info
));
2967 annotate_signal_name_end ();
2968 ui_out_text (uiout
, ", ");
2969 annotate_signal_string ();
2970 ui_out_field_string (uiout
, "signal-meaning",
2971 target_signal_to_string (stop_info
));
2972 annotate_signal_string_end ();
2973 ui_out_text (uiout
, ".\n");
2976 internal_error (__FILE__
, __LINE__
,
2977 "print_stop_reason: unrecognized enum value");
2983 /* Here to return control to GDB when the inferior stops for real.
2984 Print appropriate messages, remove breakpoints, give terminal our modes.
2986 STOP_PRINT_FRAME nonzero means print the executing frame
2987 (pc, function, args, file, line number and line text).
2988 BREAKPOINTS_FAILED nonzero means stop was due to error
2989 attempting to insert breakpoints. */
2994 /* As with the notification of thread events, we want to delay
2995 notifying the user that we've switched thread context until
2996 the inferior actually stops.
2998 (Note that there's no point in saying anything if the inferior
3000 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3001 && target_has_execution
)
3003 target_terminal_ours_for_output ();
3004 printf_filtered ("[Switching to %s]\n",
3005 target_pid_or_tid_to_str (inferior_ptid
));
3006 previous_inferior_ptid
= inferior_ptid
;
3009 /* Make sure that the current_frame's pc is correct. This
3010 is a correction for setting up the frame info before doing
3011 DECR_PC_AFTER_BREAK */
3012 if (target_has_execution
)
3013 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3014 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3015 frame code to check for this and sort out any resultant mess.
3016 DECR_PC_AFTER_BREAK needs to just go away. */
3017 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3019 if (target_has_execution
&& breakpoints_inserted
)
3021 if (remove_breakpoints ())
3023 target_terminal_ours_for_output ();
3024 printf_filtered ("Cannot remove breakpoints because ");
3025 printf_filtered ("program is no longer writable.\n");
3026 printf_filtered ("It might be running in another process.\n");
3027 printf_filtered ("Further execution is probably impossible.\n");
3030 breakpoints_inserted
= 0;
3032 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3033 Delete any breakpoint that is to be deleted at the next stop. */
3035 breakpoint_auto_delete (stop_bpstat
);
3037 /* If an auto-display called a function and that got a signal,
3038 delete that auto-display to avoid an infinite recursion. */
3040 if (stopped_by_random_signal
)
3041 disable_current_display ();
3043 /* Don't print a message if in the middle of doing a "step n"
3044 operation for n > 1 */
3045 if (step_multi
&& stop_step
)
3048 target_terminal_ours ();
3050 /* Look up the hook_stop and run it (CLI internally handles problem
3051 of stop_command's pre-hook not existing). */
3053 catch_errors (hook_stop_stub
, stop_command
,
3054 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3056 if (!target_has_stack
)
3062 /* Select innermost stack frame - i.e., current frame is frame 0,
3063 and current location is based on that.
3064 Don't do this on return from a stack dummy routine,
3065 or if the program has exited. */
3067 if (!stop_stack_dummy
)
3069 select_frame (get_current_frame ());
3071 /* Print current location without a level number, if
3072 we have changed functions or hit a breakpoint.
3073 Print source line if we have one.
3074 bpstat_print() contains the logic deciding in detail
3075 what to print, based on the event(s) that just occurred. */
3077 if (stop_print_frame
&& deprecated_selected_frame
)
3081 int do_frame_printing
= 1;
3083 bpstat_ret
= bpstat_print (stop_bpstat
);
3087 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3088 (or should) carry around the function and does (or
3089 should) use that when doing a frame comparison. */
3091 && frame_id_eq (step_frame_id
,
3092 get_frame_id (get_current_frame ()))
3093 && step_start_function
== find_pc_function (stop_pc
))
3094 source_flag
= SRC_LINE
; /* finished step, just print source line */
3096 source_flag
= SRC_AND_LOC
; /* print location and source line */
3098 case PRINT_SRC_AND_LOC
:
3099 source_flag
= SRC_AND_LOC
; /* print location and source line */
3101 case PRINT_SRC_ONLY
:
3102 source_flag
= SRC_LINE
;
3105 source_flag
= SRC_LINE
; /* something bogus */
3106 do_frame_printing
= 0;
3109 internal_error (__FILE__
, __LINE__
, "Unknown value.");
3111 /* For mi, have the same behavior every time we stop:
3112 print everything but the source line. */
3113 if (ui_out_is_mi_like_p (uiout
))
3114 source_flag
= LOC_AND_ADDRESS
;
3116 if (ui_out_is_mi_like_p (uiout
))
3117 ui_out_field_int (uiout
, "thread-id",
3118 pid_to_thread_id (inferior_ptid
));
3119 /* The behavior of this routine with respect to the source
3121 SRC_LINE: Print only source line
3122 LOCATION: Print only location
3123 SRC_AND_LOC: Print location and source line */
3124 if (do_frame_printing
)
3125 print_stack_frame (deprecated_selected_frame
, -1, source_flag
);
3127 /* Display the auto-display expressions. */
3132 /* Save the function value return registers, if we care.
3133 We might be about to restore their previous contents. */
3134 if (proceed_to_finish
)
3135 /* NB: The copy goes through to the target picking up the value of
3136 all the registers. */
3137 regcache_cpy (stop_registers
, current_regcache
);
3139 if (stop_stack_dummy
)
3141 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3142 ends with a setting of the current frame, so we can use that
3144 frame_pop (get_current_frame ());
3145 /* Set stop_pc to what it was before we called the function.
3146 Can't rely on restore_inferior_status because that only gets
3147 called if we don't stop in the called function. */
3148 stop_pc
= read_pc ();
3149 select_frame (get_current_frame ());
3153 annotate_stopped ();
3154 observer_notify_normal_stop ();
3158 hook_stop_stub (void *cmd
)
3160 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3165 signal_stop_state (int signo
)
3167 return signal_stop
[signo
];
3171 signal_print_state (int signo
)
3173 return signal_print
[signo
];
3177 signal_pass_state (int signo
)
3179 return signal_program
[signo
];
3183 signal_stop_update (int signo
, int state
)
3185 int ret
= signal_stop
[signo
];
3186 signal_stop
[signo
] = state
;
3191 signal_print_update (int signo
, int state
)
3193 int ret
= signal_print
[signo
];
3194 signal_print
[signo
] = state
;
3199 signal_pass_update (int signo
, int state
)
3201 int ret
= signal_program
[signo
];
3202 signal_program
[signo
] = state
;
3207 sig_print_header (void)
3210 Signal Stop\tPrint\tPass to program\tDescription\n");
3214 sig_print_info (enum target_signal oursig
)
3216 char *name
= target_signal_to_name (oursig
);
3217 int name_padding
= 13 - strlen (name
);
3219 if (name_padding
<= 0)
3222 printf_filtered ("%s", name
);
3223 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3224 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3225 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3226 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3227 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3230 /* Specify how various signals in the inferior should be handled. */
3233 handle_command (char *args
, int from_tty
)
3236 int digits
, wordlen
;
3237 int sigfirst
, signum
, siglast
;
3238 enum target_signal oursig
;
3241 unsigned char *sigs
;
3242 struct cleanup
*old_chain
;
3246 error_no_arg ("signal to handle");
3249 /* Allocate and zero an array of flags for which signals to handle. */
3251 nsigs
= (int) TARGET_SIGNAL_LAST
;
3252 sigs
= (unsigned char *) alloca (nsigs
);
3253 memset (sigs
, 0, nsigs
);
3255 /* Break the command line up into args. */
3257 argv
= buildargv (args
);
3262 old_chain
= make_cleanup_freeargv (argv
);
3264 /* Walk through the args, looking for signal oursigs, signal names, and
3265 actions. Signal numbers and signal names may be interspersed with
3266 actions, with the actions being performed for all signals cumulatively
3267 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3269 while (*argv
!= NULL
)
3271 wordlen
= strlen (*argv
);
3272 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3276 sigfirst
= siglast
= -1;
3278 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3280 /* Apply action to all signals except those used by the
3281 debugger. Silently skip those. */
3284 siglast
= nsigs
- 1;
3286 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3288 SET_SIGS (nsigs
, sigs
, signal_stop
);
3289 SET_SIGS (nsigs
, sigs
, signal_print
);
3291 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3293 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3295 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3297 SET_SIGS (nsigs
, sigs
, signal_print
);
3299 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3301 SET_SIGS (nsigs
, sigs
, signal_program
);
3303 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3305 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3307 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3309 SET_SIGS (nsigs
, sigs
, signal_program
);
3311 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3313 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3314 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3316 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3318 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3320 else if (digits
> 0)
3322 /* It is numeric. The numeric signal refers to our own
3323 internal signal numbering from target.h, not to host/target
3324 signal number. This is a feature; users really should be
3325 using symbolic names anyway, and the common ones like
3326 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3328 sigfirst
= siglast
= (int)
3329 target_signal_from_command (atoi (*argv
));
3330 if ((*argv
)[digits
] == '-')
3333 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3335 if (sigfirst
> siglast
)
3337 /* Bet he didn't figure we'd think of this case... */
3345 oursig
= target_signal_from_name (*argv
);
3346 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3348 sigfirst
= siglast
= (int) oursig
;
3352 /* Not a number and not a recognized flag word => complain. */
3353 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3357 /* If any signal numbers or symbol names were found, set flags for
3358 which signals to apply actions to. */
3360 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3362 switch ((enum target_signal
) signum
)
3364 case TARGET_SIGNAL_TRAP
:
3365 case TARGET_SIGNAL_INT
:
3366 if (!allsigs
&& !sigs
[signum
])
3368 if (query ("%s is used by the debugger.\n\
3369 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3375 printf_unfiltered ("Not confirmed, unchanged.\n");
3376 gdb_flush (gdb_stdout
);
3380 case TARGET_SIGNAL_0
:
3381 case TARGET_SIGNAL_DEFAULT
:
3382 case TARGET_SIGNAL_UNKNOWN
:
3383 /* Make sure that "all" doesn't print these. */
3394 target_notice_signals (inferior_ptid
);
3398 /* Show the results. */
3399 sig_print_header ();
3400 for (signum
= 0; signum
< nsigs
; signum
++)
3404 sig_print_info (signum
);
3409 do_cleanups (old_chain
);
3413 xdb_handle_command (char *args
, int from_tty
)
3416 struct cleanup
*old_chain
;
3418 /* Break the command line up into args. */
3420 argv
= buildargv (args
);
3425 old_chain
= make_cleanup_freeargv (argv
);
3426 if (argv
[1] != (char *) NULL
)
3431 bufLen
= strlen (argv
[0]) + 20;
3432 argBuf
= (char *) xmalloc (bufLen
);
3436 enum target_signal oursig
;
3438 oursig
= target_signal_from_name (argv
[0]);
3439 memset (argBuf
, 0, bufLen
);
3440 if (strcmp (argv
[1], "Q") == 0)
3441 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3444 if (strcmp (argv
[1], "s") == 0)
3446 if (!signal_stop
[oursig
])
3447 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3449 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3451 else if (strcmp (argv
[1], "i") == 0)
3453 if (!signal_program
[oursig
])
3454 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3456 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3458 else if (strcmp (argv
[1], "r") == 0)
3460 if (!signal_print
[oursig
])
3461 sprintf (argBuf
, "%s %s", argv
[0], "print");
3463 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3469 handle_command (argBuf
, from_tty
);
3471 printf_filtered ("Invalid signal handling flag.\n");
3476 do_cleanups (old_chain
);
3479 /* Print current contents of the tables set by the handle command.
3480 It is possible we should just be printing signals actually used
3481 by the current target (but for things to work right when switching
3482 targets, all signals should be in the signal tables). */
3485 signals_info (char *signum_exp
, int from_tty
)
3487 enum target_signal oursig
;
3488 sig_print_header ();
3492 /* First see if this is a symbol name. */
3493 oursig
= target_signal_from_name (signum_exp
);
3494 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3496 /* No, try numeric. */
3498 target_signal_from_command (parse_and_eval_long (signum_exp
));
3500 sig_print_info (oursig
);
3504 printf_filtered ("\n");
3505 /* These ugly casts brought to you by the native VAX compiler. */
3506 for (oursig
= TARGET_SIGNAL_FIRST
;
3507 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3508 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3512 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3513 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3514 sig_print_info (oursig
);
3517 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3520 struct inferior_status
3522 enum target_signal stop_signal
;
3526 int stop_stack_dummy
;
3527 int stopped_by_random_signal
;
3529 CORE_ADDR step_range_start
;
3530 CORE_ADDR step_range_end
;
3531 struct frame_id step_frame_id
;
3532 enum step_over_calls_kind step_over_calls
;
3533 CORE_ADDR step_resume_break_address
;
3534 int stop_after_trap
;
3536 struct regcache
*stop_registers
;
3538 /* These are here because if call_function_by_hand has written some
3539 registers and then decides to call error(), we better not have changed
3541 struct regcache
*registers
;
3543 /* A frame unique identifier. */
3544 struct frame_id selected_frame_id
;
3546 int breakpoint_proceeded
;
3547 int restore_stack_info
;
3548 int proceed_to_finish
;
3552 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3555 int size
= REGISTER_RAW_SIZE (regno
);
3556 void *buf
= alloca (size
);
3557 store_signed_integer (buf
, size
, val
);
3558 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3561 /* Save all of the information associated with the inferior<==>gdb
3562 connection. INF_STATUS is a pointer to a "struct inferior_status"
3563 (defined in inferior.h). */
3565 struct inferior_status
*
3566 save_inferior_status (int restore_stack_info
)
3568 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3570 inf_status
->stop_signal
= stop_signal
;
3571 inf_status
->stop_pc
= stop_pc
;
3572 inf_status
->stop_step
= stop_step
;
3573 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3574 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3575 inf_status
->trap_expected
= trap_expected
;
3576 inf_status
->step_range_start
= step_range_start
;
3577 inf_status
->step_range_end
= step_range_end
;
3578 inf_status
->step_frame_id
= step_frame_id
;
3579 inf_status
->step_over_calls
= step_over_calls
;
3580 inf_status
->stop_after_trap
= stop_after_trap
;
3581 inf_status
->stop_soon
= stop_soon
;
3582 /* Save original bpstat chain here; replace it with copy of chain.
3583 If caller's caller is walking the chain, they'll be happier if we
3584 hand them back the original chain when restore_inferior_status is
3586 inf_status
->stop_bpstat
= stop_bpstat
;
3587 stop_bpstat
= bpstat_copy (stop_bpstat
);
3588 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3589 inf_status
->restore_stack_info
= restore_stack_info
;
3590 inf_status
->proceed_to_finish
= proceed_to_finish
;
3592 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3594 inf_status
->registers
= regcache_dup (current_regcache
);
3596 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3601 restore_selected_frame (void *args
)
3603 struct frame_id
*fid
= (struct frame_id
*) args
;
3604 struct frame_info
*frame
;
3606 frame
= frame_find_by_id (*fid
);
3608 /* If inf_status->selected_frame_id is NULL, there was no previously
3612 warning ("Unable to restore previously selected frame.\n");
3616 select_frame (frame
);
3622 restore_inferior_status (struct inferior_status
*inf_status
)
3624 stop_signal
= inf_status
->stop_signal
;
3625 stop_pc
= inf_status
->stop_pc
;
3626 stop_step
= inf_status
->stop_step
;
3627 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3628 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3629 trap_expected
= inf_status
->trap_expected
;
3630 step_range_start
= inf_status
->step_range_start
;
3631 step_range_end
= inf_status
->step_range_end
;
3632 step_frame_id
= inf_status
->step_frame_id
;
3633 step_over_calls
= inf_status
->step_over_calls
;
3634 stop_after_trap
= inf_status
->stop_after_trap
;
3635 stop_soon
= inf_status
->stop_soon
;
3636 bpstat_clear (&stop_bpstat
);
3637 stop_bpstat
= inf_status
->stop_bpstat
;
3638 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3639 proceed_to_finish
= inf_status
->proceed_to_finish
;
3641 /* FIXME: Is the restore of stop_registers always needed. */
3642 regcache_xfree (stop_registers
);
3643 stop_registers
= inf_status
->stop_registers
;
3645 /* The inferior can be gone if the user types "print exit(0)"
3646 (and perhaps other times). */
3647 if (target_has_execution
)
3648 /* NB: The register write goes through to the target. */
3649 regcache_cpy (current_regcache
, inf_status
->registers
);
3650 regcache_xfree (inf_status
->registers
);
3652 /* FIXME: If we are being called after stopping in a function which
3653 is called from gdb, we should not be trying to restore the
3654 selected frame; it just prints a spurious error message (The
3655 message is useful, however, in detecting bugs in gdb (like if gdb
3656 clobbers the stack)). In fact, should we be restoring the
3657 inferior status at all in that case? . */
3659 if (target_has_stack
&& inf_status
->restore_stack_info
)
3661 /* The point of catch_errors is that if the stack is clobbered,
3662 walking the stack might encounter a garbage pointer and
3663 error() trying to dereference it. */
3665 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3666 "Unable to restore previously selected frame:\n",
3667 RETURN_MASK_ERROR
) == 0)
3668 /* Error in restoring the selected frame. Select the innermost
3670 select_frame (get_current_frame ());
3678 do_restore_inferior_status_cleanup (void *sts
)
3680 restore_inferior_status (sts
);
3684 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3686 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3690 discard_inferior_status (struct inferior_status
*inf_status
)
3692 /* See save_inferior_status for info on stop_bpstat. */
3693 bpstat_clear (&inf_status
->stop_bpstat
);
3694 regcache_xfree (inf_status
->registers
);
3695 regcache_xfree (inf_status
->stop_registers
);
3700 inferior_has_forked (int pid
, int *child_pid
)
3702 struct target_waitstatus last
;
3705 get_last_target_status (&last_ptid
, &last
);
3707 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3710 if (ptid_get_pid (last_ptid
) != pid
)
3713 *child_pid
= last
.value
.related_pid
;
3718 inferior_has_vforked (int pid
, int *child_pid
)
3720 struct target_waitstatus last
;
3723 get_last_target_status (&last_ptid
, &last
);
3725 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3728 if (ptid_get_pid (last_ptid
) != pid
)
3731 *child_pid
= last
.value
.related_pid
;
3736 inferior_has_execd (int pid
, char **execd_pathname
)
3738 struct target_waitstatus last
;
3741 get_last_target_status (&last_ptid
, &last
);
3743 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3746 if (ptid_get_pid (last_ptid
) != pid
)
3749 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3753 /* Oft used ptids */
3755 ptid_t minus_one_ptid
;
3757 /* Create a ptid given the necessary PID, LWP, and TID components. */
3760 ptid_build (int pid
, long lwp
, long tid
)
3770 /* Create a ptid from just a pid. */
3773 pid_to_ptid (int pid
)
3775 return ptid_build (pid
, 0, 0);
3778 /* Fetch the pid (process id) component from a ptid. */
3781 ptid_get_pid (ptid_t ptid
)
3786 /* Fetch the lwp (lightweight process) component from a ptid. */
3789 ptid_get_lwp (ptid_t ptid
)
3794 /* Fetch the tid (thread id) component from a ptid. */
3797 ptid_get_tid (ptid_t ptid
)
3802 /* ptid_equal() is used to test equality of two ptids. */
3805 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3807 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3808 && ptid1
.tid
== ptid2
.tid
);
3811 /* restore_inferior_ptid() will be used by the cleanup machinery
3812 to restore the inferior_ptid value saved in a call to
3813 save_inferior_ptid(). */
3816 restore_inferior_ptid (void *arg
)
3818 ptid_t
*saved_ptid_ptr
= arg
;
3819 inferior_ptid
= *saved_ptid_ptr
;
3823 /* Save the value of inferior_ptid so that it may be restored by a
3824 later call to do_cleanups(). Returns the struct cleanup pointer
3825 needed for later doing the cleanup. */
3828 save_inferior_ptid (void)
3830 ptid_t
*saved_ptid_ptr
;
3832 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3833 *saved_ptid_ptr
= inferior_ptid
;
3834 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3841 stop_registers
= regcache_xmalloc (current_gdbarch
);
3845 _initialize_infrun (void)
3848 register int numsigs
;
3849 struct cmd_list_element
*c
;
3851 register_gdbarch_swap (&stop_registers
, sizeof (stop_registers
), NULL
);
3852 register_gdbarch_swap (NULL
, 0, build_infrun
);
3854 add_info ("signals", signals_info
,
3855 "What debugger does when program gets various signals.\n\
3856 Specify a signal as argument to print info on that signal only.");
3857 add_info_alias ("handle", "signals", 0);
3859 add_com ("handle", class_run
, handle_command
,
3860 concat ("Specify how to handle a signal.\n\
3861 Args are signals and actions to apply to those signals.\n\
3862 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3863 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3864 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3865 The special arg \"all\" is recognized to mean all signals except those\n\
3866 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3867 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3868 Stop means reenter debugger if this signal happens (implies print).\n\
3869 Print means print a message if this signal happens.\n\
3870 Pass means let program see this signal; otherwise program doesn't know.\n\
3871 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3872 Pass and Stop may be combined.", NULL
));
3875 add_com ("lz", class_info
, signals_info
,
3876 "What debugger does when program gets various signals.\n\
3877 Specify a signal as argument to print info on that signal only.");
3878 add_com ("z", class_run
, xdb_handle_command
,
3879 concat ("Specify how to handle a signal.\n\
3880 Args are signals and actions to apply to those signals.\n\
3881 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3882 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3883 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3884 The special arg \"all\" is recognized to mean all signals except those\n\
3885 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3886 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3887 nopass), \"Q\" (noprint)\n\
3888 Stop means reenter debugger if this signal happens (implies print).\n\
3889 Print means print a message if this signal happens.\n\
3890 Pass means let program see this signal; otherwise program doesn't know.\n\
3891 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3892 Pass and Stop may be combined.", NULL
));
3897 add_cmd ("stop", class_obscure
, not_just_help_class_command
, "There is no `stop' command, but you can set a hook on `stop'.\n\
3898 This allows you to set a list of commands to be run each time execution\n\
3899 of the program stops.", &cmdlist
);
3901 numsigs
= (int) TARGET_SIGNAL_LAST
;
3902 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3903 signal_print
= (unsigned char *)
3904 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3905 signal_program
= (unsigned char *)
3906 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3907 for (i
= 0; i
< numsigs
; i
++)
3910 signal_print
[i
] = 1;
3911 signal_program
[i
] = 1;
3914 /* Signals caused by debugger's own actions
3915 should not be given to the program afterwards. */
3916 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3917 signal_program
[TARGET_SIGNAL_INT
] = 0;
3919 /* Signals that are not errors should not normally enter the debugger. */
3920 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3921 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3922 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3923 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3924 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3925 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3926 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3927 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3928 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3929 signal_print
[TARGET_SIGNAL_IO
] = 0;
3930 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
3931 signal_print
[TARGET_SIGNAL_POLL
] = 0;
3932 signal_stop
[TARGET_SIGNAL_URG
] = 0;
3933 signal_print
[TARGET_SIGNAL_URG
] = 0;
3934 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
3935 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
3937 /* These signals are used internally by user-level thread
3938 implementations. (See signal(5) on Solaris.) Like the above
3939 signals, a healthy program receives and handles them as part of
3940 its normal operation. */
3941 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
3942 signal_print
[TARGET_SIGNAL_LWP
] = 0;
3943 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
3944 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
3945 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
3946 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
3950 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
3951 (char *) &stop_on_solib_events
,
3952 "Set stopping for shared library events.\n\
3953 If nonzero, gdb will give control to the user when the dynamic linker\n\
3954 notifies gdb of shared library events. The most common event of interest\n\
3955 to the user would be loading/unloading of a new library.\n", &setlist
), &showlist
);
3958 c
= add_set_enum_cmd ("follow-fork-mode",
3960 follow_fork_mode_kind_names
, &follow_fork_mode_string
,
3961 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
3962 kernel problem. It's also not terribly useful without a GUI to
3963 help the user drive two debuggers. So for now, I'm disabling
3964 the "both" option. */
3965 /* "Set debugger response to a program call of fork \
3967 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3968 parent - the original process is debugged after a fork\n\
3969 child - the new process is debugged after a fork\n\
3970 both - both the parent and child are debugged after a fork\n\
3971 ask - the debugger will ask for one of the above choices\n\
3972 For \"both\", another copy of the debugger will be started to follow\n\
3973 the new child process. The original debugger will continue to follow\n\
3974 the original parent process. To distinguish their prompts, the\n\
3975 debugger copy's prompt will be changed.\n\
3976 For \"parent\" or \"child\", the unfollowed process will run free.\n\
3977 By default, the debugger will follow the parent process.",
3979 "Set debugger response to a program call of fork \
3981 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3982 parent - the original process is debugged after a fork\n\
3983 child - the new process is debugged after a fork\n\
3984 ask - the debugger will ask for one of the above choices\n\
3985 For \"parent\" or \"child\", the unfollowed process will run free.\n\
3986 By default, the debugger will follow the parent process.", &setlist
);
3987 add_show_from_set (c
, &showlist
);
3989 c
= add_set_enum_cmd ("scheduler-locking", class_run
, scheduler_enums
, /* array of string names */
3990 &scheduler_mode
, /* current mode */
3991 "Set mode for locking scheduler during execution.\n\
3992 off == no locking (threads may preempt at any time)\n\
3993 on == full locking (no thread except the current thread may run)\n\
3994 step == scheduler locked during every single-step operation.\n\
3995 In this mode, no other thread may run during a step command.\n\
3996 Other threads may run while stepping over a function call ('next').", &setlist
);
3998 set_cmd_sfunc (c
, set_schedlock_func
); /* traps on target vector */
3999 add_show_from_set (c
, &showlist
);
4001 c
= add_set_cmd ("step-mode", class_run
,
4002 var_boolean
, (char *) &step_stop_if_no_debug
,
4003 "Set mode of the step operation. When set, doing a step over a\n\
4004 function without debug line information will stop at the first\n\
4005 instruction of that function. Otherwise, the function is skipped and\n\
4006 the step command stops at a different source line.", &setlist
);
4007 add_show_from_set (c
, &showlist
);
4009 /* ptid initializations */
4010 null_ptid
= ptid_build (0, 0, 0);
4011 minus_one_ptid
= ptid_build (-1, 0, 0);
4012 inferior_ptid
= null_ptid
;
4013 target_last_wait_ptid
= minus_one_ptid
;