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 static int prepare_to_proceed (void);
84 void _initialize_infrun (void);
86 int inferior_ignoring_startup_exec_events
= 0;
87 int inferior_ignoring_leading_exec_events
= 0;
89 /* When set, stop the 'step' command if we enter a function which has
90 no line number information. The normal behavior is that we step
91 over such function. */
92 int step_stop_if_no_debug
= 0;
94 /* In asynchronous mode, but simulating synchronous execution. */
96 int sync_execution
= 0;
98 /* wait_for_inferior and normal_stop use this to notify the user
99 when the inferior stopped in a different thread than it had been
102 static ptid_t previous_inferior_ptid
;
104 /* This is true for configurations that may follow through execl() and
105 similar functions. At present this is only true for HP-UX native. */
107 #ifndef MAY_FOLLOW_EXEC
108 #define MAY_FOLLOW_EXEC (0)
111 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
113 /* If the program uses ELF-style shared libraries, then calls to
114 functions in shared libraries go through stubs, which live in a
115 table called the PLT (Procedure Linkage Table). The first time the
116 function is called, the stub sends control to the dynamic linker,
117 which looks up the function's real address, patches the stub so
118 that future calls will go directly to the function, and then passes
119 control to the function.
121 If we are stepping at the source level, we don't want to see any of
122 this --- we just want to skip over the stub and the dynamic linker.
123 The simple approach is to single-step until control leaves the
126 However, on some systems (e.g., Red Hat's 5.2 distribution) the
127 dynamic linker calls functions in the shared C library, so you
128 can't tell from the PC alone whether the dynamic linker is still
129 running. In this case, we use a step-resume breakpoint to get us
130 past the dynamic linker, as if we were using "next" to step over a
133 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
134 linker code or not. Normally, this means we single-step. However,
135 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
136 address where we can place a step-resume breakpoint to get past the
137 linker's symbol resolution function.
139 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
140 pretty portable way, by comparing the PC against the address ranges
141 of the dynamic linker's sections.
143 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
144 it depends on internal details of the dynamic linker. It's usually
145 not too hard to figure out where to put a breakpoint, but it
146 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
147 sanity checking. If it can't figure things out, returning zero and
148 getting the (possibly confusing) stepping behavior is better than
149 signalling an error, which will obscure the change in the
152 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
153 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
156 #ifndef SKIP_SOLIB_RESOLVER
157 #define SKIP_SOLIB_RESOLVER(pc) 0
160 /* This function returns TRUE if pc is the address of an instruction
161 that lies within the dynamic linker (such as the event hook, or the
164 This function must be used only when a dynamic linker event has
165 been caught, and the inferior is being stepped out of the hook, or
166 undefined results are guaranteed. */
168 #ifndef SOLIB_IN_DYNAMIC_LINKER
169 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
172 /* On MIPS16, a function that returns a floating point value may call
173 a library helper function to copy the return value to a floating point
174 register. The IGNORE_HELPER_CALL macro returns non-zero if we
175 should ignore (i.e. step over) this function call. */
176 #ifndef IGNORE_HELPER_CALL
177 #define IGNORE_HELPER_CALL(pc) 0
180 /* On some systems, the PC may be left pointing at an instruction that won't
181 actually be executed. This is usually indicated by a bit in the PSW. If
182 we find ourselves in such a state, then we step the target beyond the
183 nullified instruction before returning control to the user so as to avoid
186 #ifndef INSTRUCTION_NULLIFIED
187 #define INSTRUCTION_NULLIFIED 0
190 /* We can't step off a permanent breakpoint in the ordinary way, because we
191 can't remove it. Instead, we have to advance the PC to the next
192 instruction. This macro should expand to a pointer to a function that
193 does that, or zero if we have no such function. If we don't have a
194 definition for it, we have to report an error. */
195 #ifndef SKIP_PERMANENT_BREAKPOINT
196 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
198 default_skip_permanent_breakpoint (void)
201 The program is stopped at a permanent breakpoint, but GDB does not know\n\
202 how to step past a permanent breakpoint on this architecture. Try using\n\
203 a command like `return' or `jump' to continue execution.");
208 /* Convert the #defines into values. This is temporary until wfi control
209 flow is completely sorted out. */
211 #ifndef HAVE_STEPPABLE_WATCHPOINT
212 #define HAVE_STEPPABLE_WATCHPOINT 0
214 #undef HAVE_STEPPABLE_WATCHPOINT
215 #define HAVE_STEPPABLE_WATCHPOINT 1
218 #ifndef CANNOT_STEP_HW_WATCHPOINTS
219 #define CANNOT_STEP_HW_WATCHPOINTS 0
221 #undef CANNOT_STEP_HW_WATCHPOINTS
222 #define CANNOT_STEP_HW_WATCHPOINTS 1
225 /* Tables of how to react to signals; the user sets them. */
227 static unsigned char *signal_stop
;
228 static unsigned char *signal_print
;
229 static unsigned char *signal_program
;
231 #define SET_SIGS(nsigs,sigs,flags) \
233 int signum = (nsigs); \
234 while (signum-- > 0) \
235 if ((sigs)[signum]) \
236 (flags)[signum] = 1; \
239 #define UNSET_SIGS(nsigs,sigs,flags) \
241 int signum = (nsigs); \
242 while (signum-- > 0) \
243 if ((sigs)[signum]) \
244 (flags)[signum] = 0; \
247 /* Value to pass to target_resume() to cause all threads to resume */
249 #define RESUME_ALL (pid_to_ptid (-1))
251 /* Command list pointer for the "stop" placeholder. */
253 static struct cmd_list_element
*stop_command
;
255 /* Nonzero if breakpoints are now inserted in the inferior. */
257 static int breakpoints_inserted
;
259 /* Function inferior was in as of last step command. */
261 static struct symbol
*step_start_function
;
263 /* Nonzero if we are expecting a trace trap and should proceed from it. */
265 static int trap_expected
;
268 /* Nonzero if we want to give control to the user when we're notified
269 of shared library events by the dynamic linker. */
270 static int stop_on_solib_events
;
274 /* Nonzero if the next time we try to continue the inferior, it will
275 step one instruction and generate a spurious trace trap.
276 This is used to compensate for a bug in HP-UX. */
278 static int trap_expected_after_continue
;
281 /* Nonzero means expecting a trace trap
282 and should stop the inferior and return silently when it happens. */
286 /* Nonzero means expecting a trap and caller will handle it themselves.
287 It is used after attach, due to attaching to a process;
288 when running in the shell before the child program has been exec'd;
289 and when running some kinds of remote stuff (FIXME?). */
291 enum stop_kind stop_soon
;
293 /* Nonzero if proceed is being used for a "finish" command or a similar
294 situation when stop_registers should be saved. */
296 int proceed_to_finish
;
298 /* Save register contents here when about to pop a stack dummy frame,
299 if-and-only-if proceed_to_finish is set.
300 Thus this contains the return value from the called function (assuming
301 values are returned in a register). */
303 struct regcache
*stop_registers
;
305 /* Nonzero if program stopped due to error trying to insert breakpoints. */
307 static int breakpoints_failed
;
309 /* Nonzero after stop if current stack frame should be printed. */
311 static int stop_print_frame
;
313 static struct breakpoint
*step_resume_breakpoint
= NULL
;
314 static struct breakpoint
*through_sigtramp_breakpoint
= NULL
;
316 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
317 interactions with an inferior that is running a kernel function
318 (aka, a system call or "syscall"). wait_for_inferior therefore
319 may have a need to know when the inferior is in a syscall. This
320 is a count of the number of inferior threads which are known to
321 currently be running in a syscall. */
322 static int number_of_threads_in_syscalls
;
324 /* This is a cached copy of the pid/waitstatus of the last event
325 returned by target_wait()/target_wait_hook(). This information is
326 returned by get_last_target_status(). */
327 static ptid_t target_last_wait_ptid
;
328 static struct target_waitstatus target_last_waitstatus
;
330 /* This is used to remember when a fork, vfork or exec event
331 was caught by a catchpoint, and thus the event is to be
332 followed at the next resume of the inferior, and not
336 enum target_waitkind kind
;
343 char *execd_pathname
;
347 static const char follow_fork_mode_ask
[] = "ask";
348 static const char follow_fork_mode_child
[] = "child";
349 static const char follow_fork_mode_parent
[] = "parent";
351 static const char *follow_fork_mode_kind_names
[] = {
352 follow_fork_mode_ask
,
353 follow_fork_mode_child
,
354 follow_fork_mode_parent
,
358 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
364 const char *follow_mode
= follow_fork_mode_string
;
365 int follow_child
= (follow_mode
== follow_fork_mode_child
);
367 /* Or, did the user not know, and want us to ask? */
368 if (follow_fork_mode_string
== follow_fork_mode_ask
)
370 internal_error (__FILE__
, __LINE__
,
371 "follow_inferior_fork: \"ask\" mode not implemented");
372 /* follow_mode = follow_fork_mode_...; */
375 return target_follow_fork (follow_child
);
379 follow_inferior_reset_breakpoints (void)
381 /* Was there a step_resume breakpoint? (There was if the user
382 did a "next" at the fork() call.) If so, explicitly reset its
385 step_resumes are a form of bp that are made to be per-thread.
386 Since we created the step_resume bp when the parent process
387 was being debugged, and now are switching to the child process,
388 from the breakpoint package's viewpoint, that's a switch of
389 "threads". We must update the bp's notion of which thread
390 it is for, or it'll be ignored when it triggers. */
392 if (step_resume_breakpoint
)
393 breakpoint_re_set_thread (step_resume_breakpoint
);
395 /* Reinsert all breakpoints in the child. The user may have set
396 breakpoints after catching the fork, in which case those
397 were never set in the child, but only in the parent. This makes
398 sure the inserted breakpoints match the breakpoint list. */
400 breakpoint_re_set ();
401 insert_breakpoints ();
404 /* EXECD_PATHNAME is assumed to be non-NULL. */
407 follow_exec (int pid
, char *execd_pathname
)
410 struct target_ops
*tgt
;
412 if (!may_follow_exec
)
415 /* This is an exec event that we actually wish to pay attention to.
416 Refresh our symbol table to the newly exec'd program, remove any
419 If there are breakpoints, they aren't really inserted now,
420 since the exec() transformed our inferior into a fresh set
423 We want to preserve symbolic breakpoints on the list, since
424 we have hopes that they can be reset after the new a.out's
425 symbol table is read.
427 However, any "raw" breakpoints must be removed from the list
428 (e.g., the solib bp's), since their address is probably invalid
431 And, we DON'T want to call delete_breakpoints() here, since
432 that may write the bp's "shadow contents" (the instruction
433 value that was overwritten witha TRAP instruction). Since
434 we now have a new a.out, those shadow contents aren't valid. */
435 update_breakpoints_after_exec ();
437 /* If there was one, it's gone now. We cannot truly step-to-next
438 statement through an exec(). */
439 step_resume_breakpoint
= NULL
;
440 step_range_start
= 0;
443 /* If there was one, it's gone now. */
444 through_sigtramp_breakpoint
= NULL
;
446 /* What is this a.out's name? */
447 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
449 /* We've followed the inferior through an exec. Therefore, the
450 inferior has essentially been killed & reborn. */
452 /* First collect the run target in effect. */
453 tgt
= find_run_target ();
454 /* If we can't find one, things are in a very strange state... */
456 error ("Could find run target to save before following exec");
458 gdb_flush (gdb_stdout
);
459 target_mourn_inferior ();
460 inferior_ptid
= pid_to_ptid (saved_pid
);
461 /* Because mourn_inferior resets inferior_ptid. */
464 /* That a.out is now the one to use. */
465 exec_file_attach (execd_pathname
, 0);
467 /* And also is where symbols can be found. */
468 symbol_file_add_main (execd_pathname
, 0);
470 /* Reset the shared library package. This ensures that we get
471 a shlib event when the child reaches "_start", at which point
472 the dld will have had a chance to initialize the child. */
473 #if defined(SOLIB_RESTART)
476 #ifdef SOLIB_CREATE_INFERIOR_HOOK
477 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
480 /* Reinsert all breakpoints. (Those which were symbolic have
481 been reset to the proper address in the new a.out, thanks
482 to symbol_file_command...) */
483 insert_breakpoints ();
485 /* The next resume of this inferior should bring it to the shlib
486 startup breakpoints. (If the user had also set bp's on
487 "main" from the old (parent) process, then they'll auto-
488 matically get reset there in the new process.) */
491 /* Non-zero if we just simulating a single-step. This is needed
492 because we cannot remove the breakpoints in the inferior process
493 until after the `wait' in `wait_for_inferior'. */
494 static int singlestep_breakpoints_inserted_p
= 0;
497 /* Things to clean up if we QUIT out of resume (). */
500 resume_cleanups (void *ignore
)
505 static const char schedlock_off
[] = "off";
506 static const char schedlock_on
[] = "on";
507 static const char schedlock_step
[] = "step";
508 static const char *scheduler_mode
= schedlock_off
;
509 static const char *scheduler_enums
[] = {
517 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
519 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
520 the set command passed as a parameter. The clone operation will
521 include (BUG?) any ``set'' command callback, if present.
522 Commands like ``info set'' call all the ``show'' command
523 callbacks. Unfortunatly, for ``show'' commands cloned from
524 ``set'', this includes callbacks belonging to ``set'' commands.
525 Making this worse, this only occures if add_show_from_set() is
526 called after add_cmd_sfunc() (BUG?). */
527 if (cmd_type (c
) == set_cmd
)
528 if (!target_can_lock_scheduler
)
530 scheduler_mode
= schedlock_off
;
531 error ("Target '%s' cannot support this command.", target_shortname
);
536 /* Resume the inferior, but allow a QUIT. This is useful if the user
537 wants to interrupt some lengthy single-stepping operation
538 (for child processes, the SIGINT goes to the inferior, and so
539 we get a SIGINT random_signal, but for remote debugging and perhaps
540 other targets, that's not true).
542 STEP nonzero if we should step (zero to continue instead).
543 SIG is the signal to give the inferior (zero for none). */
545 resume (int step
, enum target_signal sig
)
547 int should_resume
= 1;
548 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
551 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
554 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
555 over an instruction that causes a page fault without triggering
556 a hardware watchpoint. The kernel properly notices that it shouldn't
557 stop, because the hardware watchpoint is not triggered, but it forgets
558 the step request and continues the program normally.
559 Work around the problem by removing hardware watchpoints if a step is
560 requested, GDB will check for a hardware watchpoint trigger after the
562 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
563 remove_hw_watchpoints ();
566 /* Normally, by the time we reach `resume', the breakpoints are either
567 removed or inserted, as appropriate. The exception is if we're sitting
568 at a permanent breakpoint; we need to step over it, but permanent
569 breakpoints can't be removed. So we have to test for it here. */
570 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
571 SKIP_PERMANENT_BREAKPOINT ();
573 if (SOFTWARE_SINGLE_STEP_P () && step
)
575 /* Do it the hard way, w/temp breakpoints */
576 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
577 /* ...and don't ask hardware to do it. */
579 /* and do not pull these breakpoints until after a `wait' in
580 `wait_for_inferior' */
581 singlestep_breakpoints_inserted_p
= 1;
584 /* Handle any optimized stores to the inferior NOW... */
585 #ifdef DO_DEFERRED_STORES
589 /* If there were any forks/vforks/execs that were caught and are
590 now to be followed, then do so. */
591 switch (pending_follow
.kind
)
593 case TARGET_WAITKIND_FORKED
:
594 case TARGET_WAITKIND_VFORKED
:
595 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
600 case TARGET_WAITKIND_EXECD
:
601 /* follow_exec is called as soon as the exec event is seen. */
602 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
609 /* Install inferior's terminal modes. */
610 target_terminal_inferior ();
616 resume_ptid
= RESUME_ALL
; /* Default */
618 if ((step
|| singlestep_breakpoints_inserted_p
) &&
619 !breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
621 /* Stepping past a breakpoint without inserting breakpoints.
622 Make sure only the current thread gets to step, so that
623 other threads don't sneak past breakpoints while they are
626 resume_ptid
= inferior_ptid
;
629 if ((scheduler_mode
== schedlock_on
) ||
630 (scheduler_mode
== schedlock_step
&&
631 (step
|| singlestep_breakpoints_inserted_p
)))
633 /* User-settable 'scheduler' mode requires solo thread resume. */
634 resume_ptid
= inferior_ptid
;
637 if (CANNOT_STEP_BREAKPOINT
)
639 /* Most targets can step a breakpoint instruction, thus
640 executing it normally. But if this one cannot, just
641 continue and we will hit it anyway. */
642 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
645 target_resume (resume_ptid
, step
, sig
);
648 discard_cleanups (old_cleanups
);
652 /* Clear out all variables saying what to do when inferior is continued.
653 First do this, then set the ones you want, then call `proceed'. */
656 clear_proceed_status (void)
659 step_range_start
= 0;
661 step_frame_id
= null_frame_id
;
662 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
664 stop_soon
= NO_STOP_QUIETLY
;
665 proceed_to_finish
= 0;
666 breakpoint_proceeded
= 1; /* We're about to proceed... */
668 /* Discard any remaining commands or status from previous stop. */
669 bpstat_clear (&stop_bpstat
);
672 /* This should be suitable for any targets that support threads. */
675 prepare_to_proceed (void)
678 struct target_waitstatus wait_status
;
680 /* Get the last target status returned by target_wait(). */
681 get_last_target_status (&wait_ptid
, &wait_status
);
683 /* Make sure we were stopped either at a breakpoint, or because
685 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
686 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
687 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
692 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
693 && !ptid_equal (inferior_ptid
, wait_ptid
))
695 /* Switched over from WAIT_PID. */
696 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
698 if (wait_pc
!= read_pc ())
700 /* Switch back to WAIT_PID thread. */
701 inferior_ptid
= wait_ptid
;
703 /* FIXME: This stuff came from switch_to_thread() in
704 thread.c (which should probably be a public function). */
705 flush_cached_frames ();
706 registers_changed ();
708 select_frame (get_current_frame ());
711 /* We return 1 to indicate that there is a breakpoint here,
712 so we need to step over it before continuing to avoid
713 hitting it straight away. */
714 if (breakpoint_here_p (wait_pc
))
722 /* Record the pc of the program the last time it stopped. This is
723 just used internally by wait_for_inferior, but need to be preserved
724 over calls to it and cleared when the inferior is started. */
725 static CORE_ADDR prev_pc
;
727 /* Basic routine for continuing the program in various fashions.
729 ADDR is the address to resume at, or -1 for resume where stopped.
730 SIGGNAL is the signal to give it, or 0 for none,
731 or -1 for act according to how it stopped.
732 STEP is nonzero if should trap after one instruction.
733 -1 means return after that and print nothing.
734 You should probably set various step_... variables
735 before calling here, if you are stepping.
737 You should call clear_proceed_status before calling proceed. */
740 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
745 step_start_function
= find_pc_function (read_pc ());
749 if (addr
== (CORE_ADDR
) -1)
751 /* If there is a breakpoint at the address we will resume at,
752 step one instruction before inserting breakpoints
753 so that we do not stop right away (and report a second
754 hit at this breakpoint). */
756 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
759 #ifndef STEP_SKIPS_DELAY
760 #define STEP_SKIPS_DELAY(pc) (0)
761 #define STEP_SKIPS_DELAY_P (0)
763 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
764 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
765 is slow (it needs to read memory from the target). */
766 if (STEP_SKIPS_DELAY_P
767 && breakpoint_here_p (read_pc () + 4)
768 && STEP_SKIPS_DELAY (read_pc ()))
776 /* In a multi-threaded task we may select another thread
777 and then continue or step.
779 But if the old thread was stopped at a breakpoint, it
780 will immediately cause another breakpoint stop without
781 any execution (i.e. it will report a breakpoint hit
782 incorrectly). So we must step over it first.
784 prepare_to_proceed checks the current thread against the thread
785 that reported the most recent event. If a step-over is required
786 it returns TRUE and sets the current thread to the old thread. */
787 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
791 if (trap_expected_after_continue
)
793 /* If (step == 0), a trap will be automatically generated after
794 the first instruction is executed. Force step one
795 instruction to clear this condition. This should not occur
796 if step is nonzero, but it is harmless in that case. */
798 trap_expected_after_continue
= 0;
800 #endif /* HP_OS_BUG */
803 /* We will get a trace trap after one instruction.
804 Continue it automatically and insert breakpoints then. */
808 insert_breakpoints ();
809 /* If we get here there was no call to error() in
810 insert breakpoints -- so they were inserted. */
811 breakpoints_inserted
= 1;
814 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
815 stop_signal
= siggnal
;
816 /* If this signal should not be seen by program,
817 give it zero. Used for debugging signals. */
818 else if (!signal_program
[stop_signal
])
819 stop_signal
= TARGET_SIGNAL_0
;
821 annotate_starting ();
823 /* Make sure that output from GDB appears before output from the
825 gdb_flush (gdb_stdout
);
827 /* Refresh prev_pc value just prior to resuming. This used to be
828 done in stop_stepping, however, setting prev_pc there did not handle
829 scenarios such as inferior function calls or returning from
830 a function via the return command. In those cases, the prev_pc
831 value was not set properly for subsequent commands. The prev_pc value
832 is used to initialize the starting line number in the ecs. With an
833 invalid value, the gdb next command ends up stopping at the position
834 represented by the next line table entry past our start position.
835 On platforms that generate one line table entry per line, this
836 is not a problem. However, on the ia64, the compiler generates
837 extraneous line table entries that do not increase the line number.
838 When we issue the gdb next command on the ia64 after an inferior call
839 or a return command, we often end up a few instructions forward, still
840 within the original line we started.
842 An attempt was made to have init_execution_control_state () refresh
843 the prev_pc value before calculating the line number. This approach
844 did not work because on platforms that use ptrace, the pc register
845 cannot be read unless the inferior is stopped. At that point, we
846 are not guaranteed the inferior is stopped and so the read_pc ()
847 call can fail. Setting the prev_pc value here ensures the value is
848 updated correctly when the inferior is stopped. */
849 prev_pc
= read_pc ();
851 /* Resume inferior. */
852 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
854 /* Wait for it to stop (if not standalone)
855 and in any case decode why it stopped, and act accordingly. */
856 /* Do this only if we are not using the event loop, or if the target
857 does not support asynchronous execution. */
858 if (!event_loop_p
|| !target_can_async_p ())
860 wait_for_inferior ();
866 /* Start remote-debugging of a machine over a serial link. */
872 init_wait_for_inferior ();
873 stop_soon
= STOP_QUIETLY
;
876 /* Always go on waiting for the target, regardless of the mode. */
877 /* FIXME: cagney/1999-09-23: At present it isn't possible to
878 indicate to wait_for_inferior that a target should timeout if
879 nothing is returned (instead of just blocking). Because of this,
880 targets expecting an immediate response need to, internally, set
881 things up so that the target_wait() is forced to eventually
883 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
884 differentiate to its caller what the state of the target is after
885 the initial open has been performed. Here we're assuming that
886 the target has stopped. It should be possible to eventually have
887 target_open() return to the caller an indication that the target
888 is currently running and GDB state should be set to the same as
890 wait_for_inferior ();
894 /* Initialize static vars when a new inferior begins. */
897 init_wait_for_inferior (void)
899 /* These are meaningless until the first time through wait_for_inferior. */
903 trap_expected_after_continue
= 0;
905 breakpoints_inserted
= 0;
906 breakpoint_init_inferior (inf_starting
);
908 /* Don't confuse first call to proceed(). */
909 stop_signal
= TARGET_SIGNAL_0
;
911 /* The first resume is not following a fork/vfork/exec. */
912 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
914 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
915 number_of_threads_in_syscalls
= 0;
917 clear_proceed_status ();
921 delete_breakpoint_current_contents (void *arg
)
923 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
924 if (*breakpointp
!= NULL
)
926 delete_breakpoint (*breakpointp
);
931 /* This enum encodes possible reasons for doing a target_wait, so that
932 wfi can call target_wait in one place. (Ultimately the call will be
933 moved out of the infinite loop entirely.) */
937 infwait_normal_state
,
938 infwait_thread_hop_state
,
939 infwait_nullified_state
,
940 infwait_nonstep_watch_state
943 /* Why did the inferior stop? Used to print the appropriate messages
944 to the interface from within handle_inferior_event(). */
945 enum inferior_stop_reason
947 /* We don't know why. */
949 /* Step, next, nexti, stepi finished. */
951 /* Found breakpoint. */
953 /* Inferior terminated by signal. */
955 /* Inferior exited. */
957 /* Inferior received signal, and user asked to be notified. */
961 /* This structure contains what used to be local variables in
962 wait_for_inferior. Probably many of them can return to being
963 locals in handle_inferior_event. */
965 struct execution_control_state
967 struct target_waitstatus ws
;
968 struct target_waitstatus
*wp
;
971 CORE_ADDR stop_func_start
;
972 CORE_ADDR stop_func_end
;
973 char *stop_func_name
;
974 struct symtab_and_line sal
;
975 int remove_breakpoints_on_following_step
;
977 struct symtab
*current_symtab
;
978 int handling_longjmp
; /* FIXME */
980 ptid_t saved_inferior_ptid
;
982 int stepping_through_solib_after_catch
;
983 bpstat stepping_through_solib_catchpoints
;
984 int enable_hw_watchpoints_after_wait
;
985 int stepping_through_sigtramp
;
986 int new_thread_event
;
987 struct target_waitstatus tmpstatus
;
988 enum infwait_states infwait_state
;
993 void init_execution_control_state (struct execution_control_state
*ecs
);
995 void handle_inferior_event (struct execution_control_state
*ecs
);
997 static void check_sigtramp2 (struct execution_control_state
*ecs
);
998 static void step_into_function (struct execution_control_state
*ecs
);
999 static void step_over_function (struct execution_control_state
*ecs
);
1000 static void stop_stepping (struct execution_control_state
*ecs
);
1001 static void prepare_to_wait (struct execution_control_state
*ecs
);
1002 static void keep_going (struct execution_control_state
*ecs
);
1003 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1006 /* Wait for control to return from inferior to debugger.
1007 If inferior gets a signal, we may decide to start it up again
1008 instead of returning. That is why there is a loop in this function.
1009 When this function actually returns it means the inferior
1010 should be left stopped and GDB should read more commands. */
1013 wait_for_inferior (void)
1015 struct cleanup
*old_cleanups
;
1016 struct execution_control_state ecss
;
1017 struct execution_control_state
*ecs
;
1019 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
1020 &step_resume_breakpoint
);
1021 make_cleanup (delete_breakpoint_current_contents
,
1022 &through_sigtramp_breakpoint
);
1024 /* wfi still stays in a loop, so it's OK just to take the address of
1025 a local to get the ecs pointer. */
1028 /* Fill in with reasonable starting values. */
1029 init_execution_control_state (ecs
);
1031 /* We'll update this if & when we switch to a new thread. */
1032 previous_inferior_ptid
= inferior_ptid
;
1034 overlay_cache_invalid
= 1;
1036 /* We have to invalidate the registers BEFORE calling target_wait
1037 because they can be loaded from the target while in target_wait.
1038 This makes remote debugging a bit more efficient for those
1039 targets that provide critical registers as part of their normal
1040 status mechanism. */
1042 registers_changed ();
1046 if (target_wait_hook
)
1047 ecs
->ptid
= target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1049 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1051 /* Now figure out what to do with the result of the result. */
1052 handle_inferior_event (ecs
);
1054 if (!ecs
->wait_some_more
)
1057 do_cleanups (old_cleanups
);
1060 /* Asynchronous version of wait_for_inferior. It is called by the
1061 event loop whenever a change of state is detected on the file
1062 descriptor corresponding to the target. It can be called more than
1063 once to complete a single execution command. In such cases we need
1064 to keep the state in a global variable ASYNC_ECSS. If it is the
1065 last time that this function is called for a single execution
1066 command, then report to the user that the inferior has stopped, and
1067 do the necessary cleanups. */
1069 struct execution_control_state async_ecss
;
1070 struct execution_control_state
*async_ecs
;
1073 fetch_inferior_event (void *client_data
)
1075 static struct cleanup
*old_cleanups
;
1077 async_ecs
= &async_ecss
;
1079 if (!async_ecs
->wait_some_more
)
1081 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1082 &step_resume_breakpoint
);
1083 make_exec_cleanup (delete_breakpoint_current_contents
,
1084 &through_sigtramp_breakpoint
);
1086 /* Fill in with reasonable starting values. */
1087 init_execution_control_state (async_ecs
);
1089 /* We'll update this if & when we switch to a new thread. */
1090 previous_inferior_ptid
= inferior_ptid
;
1092 overlay_cache_invalid
= 1;
1094 /* We have to invalidate the registers BEFORE calling target_wait
1095 because they can be loaded from the target while in target_wait.
1096 This makes remote debugging a bit more efficient for those
1097 targets that provide critical registers as part of their normal
1098 status mechanism. */
1100 registers_changed ();
1103 if (target_wait_hook
)
1105 target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1107 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1109 /* Now figure out what to do with the result of the result. */
1110 handle_inferior_event (async_ecs
);
1112 if (!async_ecs
->wait_some_more
)
1114 /* Do only the cleanups that have been added by this
1115 function. Let the continuations for the commands do the rest,
1116 if there are any. */
1117 do_exec_cleanups (old_cleanups
);
1119 if (step_multi
&& stop_step
)
1120 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1122 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1126 /* Prepare an execution control state for looping through a
1127 wait_for_inferior-type loop. */
1130 init_execution_control_state (struct execution_control_state
*ecs
)
1132 /* ecs->another_trap? */
1133 ecs
->random_signal
= 0;
1134 ecs
->remove_breakpoints_on_following_step
= 0;
1135 ecs
->handling_longjmp
= 0; /* FIXME */
1136 ecs
->update_step_sp
= 0;
1137 ecs
->stepping_through_solib_after_catch
= 0;
1138 ecs
->stepping_through_solib_catchpoints
= NULL
;
1139 ecs
->enable_hw_watchpoints_after_wait
= 0;
1140 ecs
->stepping_through_sigtramp
= 0;
1141 ecs
->sal
= find_pc_line (prev_pc
, 0);
1142 ecs
->current_line
= ecs
->sal
.line
;
1143 ecs
->current_symtab
= ecs
->sal
.symtab
;
1144 ecs
->infwait_state
= infwait_normal_state
;
1145 ecs
->waiton_ptid
= pid_to_ptid (-1);
1146 ecs
->wp
= &(ecs
->ws
);
1149 /* Call this function before setting step_resume_breakpoint, as a
1150 sanity check. There should never be more than one step-resume
1151 breakpoint per thread, so we should never be setting a new
1152 step_resume_breakpoint when one is already active. */
1154 check_for_old_step_resume_breakpoint (void)
1156 if (step_resume_breakpoint
)
1158 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1161 /* Return the cached copy of the last pid/waitstatus returned by
1162 target_wait()/target_wait_hook(). The data is actually cached by
1163 handle_inferior_event(), which gets called immediately after
1164 target_wait()/target_wait_hook(). */
1167 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1169 *ptidp
= target_last_wait_ptid
;
1170 *status
= target_last_waitstatus
;
1173 /* Switch thread contexts, maintaining "infrun state". */
1176 context_switch (struct execution_control_state
*ecs
)
1178 /* Caution: it may happen that the new thread (or the old one!)
1179 is not in the thread list. In this case we must not attempt
1180 to "switch context", or we run the risk that our context may
1181 be lost. This may happen as a result of the target module
1182 mishandling thread creation. */
1184 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1185 { /* Perform infrun state context switch: */
1186 /* Save infrun state for the old thread. */
1187 save_infrun_state (inferior_ptid
, prev_pc
,
1188 trap_expected
, step_resume_breakpoint
,
1189 through_sigtramp_breakpoint
, step_range_start
,
1190 step_range_end
, &step_frame_id
,
1191 ecs
->handling_longjmp
, ecs
->another_trap
,
1192 ecs
->stepping_through_solib_after_catch
,
1193 ecs
->stepping_through_solib_catchpoints
,
1194 ecs
->stepping_through_sigtramp
,
1195 ecs
->current_line
, ecs
->current_symtab
, step_sp
);
1197 /* Load infrun state for the new thread. */
1198 load_infrun_state (ecs
->ptid
, &prev_pc
,
1199 &trap_expected
, &step_resume_breakpoint
,
1200 &through_sigtramp_breakpoint
, &step_range_start
,
1201 &step_range_end
, &step_frame_id
,
1202 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1203 &ecs
->stepping_through_solib_after_catch
,
1204 &ecs
->stepping_through_solib_catchpoints
,
1205 &ecs
->stepping_through_sigtramp
,
1206 &ecs
->current_line
, &ecs
->current_symtab
, &step_sp
);
1208 inferior_ptid
= ecs
->ptid
;
1211 /* Wrapper for PC_IN_SIGTRAMP that takes care of the need to find the
1214 In a classic example of "left hand VS right hand", "infrun.c" was
1215 trying to improve GDB's performance by caching the result of calls
1216 to calls to find_pc_partial_funtion, while at the same time
1217 find_pc_partial_function was also trying to ramp up performance by
1218 caching its most recent return value. The below makes the the
1219 function find_pc_partial_function solely responsibile for
1220 performance issues (the local cache that relied on a global
1221 variable - arrrggg - deleted).
1223 Using the testsuite and gcov, it was found that dropping the local
1224 "infrun.c" cache and instead relying on find_pc_partial_function
1225 increased the number of calls to 12000 (from 10000), but the number
1226 of times find_pc_partial_function's cache missed (this is what
1227 matters) was only increased by only 4 (to 3569). (A quick back of
1228 envelope caculation suggests that the extra 2000 function calls
1229 @1000 extra instructions per call make the 1 MIP VAX testsuite run
1230 take two extra seconds, oops :-)
1232 Long term, this function can be eliminated, replaced by the code:
1233 get_frame_type(current_frame()) == SIGTRAMP_FRAME (for new
1234 architectures this is very cheap). */
1237 pc_in_sigtramp (CORE_ADDR pc
)
1240 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
1241 return PC_IN_SIGTRAMP (pc
, name
);
1245 /* Given an execution control state that has been freshly filled in
1246 by an event from the inferior, figure out what it means and take
1247 appropriate action. */
1250 handle_inferior_event (struct execution_control_state
*ecs
)
1252 CORE_ADDR real_stop_pc
;
1253 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1254 thinking that the variable stepped_after_stopped_by_watchpoint
1255 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1256 defined in the file "config/pa/nm-hppah.h", accesses the variable
1257 indirectly. Mutter something rude about the HP merge. */
1258 int stepped_after_stopped_by_watchpoint
;
1259 int sw_single_step_trap_p
= 0;
1261 /* Cache the last pid/waitstatus. */
1262 target_last_wait_ptid
= ecs
->ptid
;
1263 target_last_waitstatus
= *ecs
->wp
;
1265 switch (ecs
->infwait_state
)
1267 case infwait_thread_hop_state
:
1268 /* Cancel the waiton_ptid. */
1269 ecs
->waiton_ptid
= pid_to_ptid (-1);
1270 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1271 is serviced in this loop, below. */
1272 if (ecs
->enable_hw_watchpoints_after_wait
)
1274 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1275 ecs
->enable_hw_watchpoints_after_wait
= 0;
1277 stepped_after_stopped_by_watchpoint
= 0;
1280 case infwait_normal_state
:
1281 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1282 is serviced in this loop, below. */
1283 if (ecs
->enable_hw_watchpoints_after_wait
)
1285 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1286 ecs
->enable_hw_watchpoints_after_wait
= 0;
1288 stepped_after_stopped_by_watchpoint
= 0;
1291 case infwait_nullified_state
:
1292 stepped_after_stopped_by_watchpoint
= 0;
1295 case infwait_nonstep_watch_state
:
1296 insert_breakpoints ();
1298 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1299 handle things like signals arriving and other things happening
1300 in combination correctly? */
1301 stepped_after_stopped_by_watchpoint
= 1;
1305 internal_error (__FILE__
, __LINE__
, "bad switch");
1307 ecs
->infwait_state
= infwait_normal_state
;
1309 flush_cached_frames ();
1311 /* If it's a new process, add it to the thread database */
1313 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1314 && !in_thread_list (ecs
->ptid
));
1316 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1317 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1319 add_thread (ecs
->ptid
);
1321 ui_out_text (uiout
, "[New ");
1322 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1323 ui_out_text (uiout
, "]\n");
1326 /* NOTE: This block is ONLY meant to be invoked in case of a
1327 "thread creation event"! If it is invoked for any other
1328 sort of event (such as a new thread landing on a breakpoint),
1329 the event will be discarded, which is almost certainly
1332 To avoid this, the low-level module (eg. target_wait)
1333 should call in_thread_list and add_thread, so that the
1334 new thread is known by the time we get here. */
1336 /* We may want to consider not doing a resume here in order
1337 to give the user a chance to play with the new thread.
1338 It might be good to make that a user-settable option. */
1340 /* At this point, all threads are stopped (happens
1341 automatically in either the OS or the native code).
1342 Therefore we need to continue all threads in order to
1345 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1346 prepare_to_wait (ecs
);
1351 switch (ecs
->ws
.kind
)
1353 case TARGET_WAITKIND_LOADED
:
1354 /* Ignore gracefully during startup of the inferior, as it
1355 might be the shell which has just loaded some objects,
1356 otherwise add the symbols for the newly loaded objects. */
1358 if (stop_soon
== NO_STOP_QUIETLY
)
1360 /* Remove breakpoints, SOLIB_ADD might adjust
1361 breakpoint addresses via breakpoint_re_set. */
1362 if (breakpoints_inserted
)
1363 remove_breakpoints ();
1365 /* Check for any newly added shared libraries if we're
1366 supposed to be adding them automatically. Switch
1367 terminal for any messages produced by
1368 breakpoint_re_set. */
1369 target_terminal_ours_for_output ();
1370 SOLIB_ADD (NULL
, 0, NULL
, auto_solib_add
);
1371 target_terminal_inferior ();
1373 /* Reinsert breakpoints and continue. */
1374 if (breakpoints_inserted
)
1375 insert_breakpoints ();
1378 resume (0, TARGET_SIGNAL_0
);
1379 prepare_to_wait (ecs
);
1382 case TARGET_WAITKIND_SPURIOUS
:
1383 resume (0, TARGET_SIGNAL_0
);
1384 prepare_to_wait (ecs
);
1387 case TARGET_WAITKIND_EXITED
:
1388 target_terminal_ours (); /* Must do this before mourn anyway */
1389 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1391 /* Record the exit code in the convenience variable $_exitcode, so
1392 that the user can inspect this again later. */
1393 set_internalvar (lookup_internalvar ("_exitcode"),
1394 value_from_longest (builtin_type_int
,
1395 (LONGEST
) ecs
->ws
.value
.integer
));
1396 gdb_flush (gdb_stdout
);
1397 target_mourn_inferior ();
1398 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1399 stop_print_frame
= 0;
1400 stop_stepping (ecs
);
1403 case TARGET_WAITKIND_SIGNALLED
:
1404 stop_print_frame
= 0;
1405 stop_signal
= ecs
->ws
.value
.sig
;
1406 target_terminal_ours (); /* Must do this before mourn anyway */
1408 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1409 reach here unless the inferior is dead. However, for years
1410 target_kill() was called here, which hints that fatal signals aren't
1411 really fatal on some systems. If that's true, then some changes
1413 target_mourn_inferior ();
1415 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1416 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1417 stop_stepping (ecs
);
1420 /* The following are the only cases in which we keep going;
1421 the above cases end in a continue or goto. */
1422 case TARGET_WAITKIND_FORKED
:
1423 case TARGET_WAITKIND_VFORKED
:
1424 stop_signal
= TARGET_SIGNAL_TRAP
;
1425 pending_follow
.kind
= ecs
->ws
.kind
;
1427 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1428 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1430 stop_pc
= read_pc ();
1432 /* Assume that catchpoints are not really software breakpoints. If
1433 some future target implements them using software breakpoints then
1434 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1435 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1436 bpstat_stop_status will not decrement the PC. */
1438 stop_bpstat
= bpstat_stop_status (&stop_pc
, 1);
1440 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1442 /* If no catchpoint triggered for this, then keep going. */
1443 if (ecs
->random_signal
)
1445 stop_signal
= TARGET_SIGNAL_0
;
1449 goto process_event_stop_test
;
1451 case TARGET_WAITKIND_EXECD
:
1452 stop_signal
= TARGET_SIGNAL_TRAP
;
1454 /* NOTE drow/2002-12-05: This code should be pushed down into the
1455 target_wait function. Until then following vfork on HP/UX 10.20
1456 is probably broken by this. Of course, it's broken anyway. */
1457 /* Is this a target which reports multiple exec events per actual
1458 call to exec()? (HP-UX using ptrace does, for example.) If so,
1459 ignore all but the last one. Just resume the exec'r, and wait
1460 for the next exec event. */
1461 if (inferior_ignoring_leading_exec_events
)
1463 inferior_ignoring_leading_exec_events
--;
1464 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1465 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1467 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1468 prepare_to_wait (ecs
);
1471 inferior_ignoring_leading_exec_events
=
1472 target_reported_exec_events_per_exec_call () - 1;
1474 pending_follow
.execd_pathname
=
1475 savestring (ecs
->ws
.value
.execd_pathname
,
1476 strlen (ecs
->ws
.value
.execd_pathname
));
1478 /* This causes the eventpoints and symbol table to be reset. Must
1479 do this now, before trying to determine whether to stop. */
1480 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1481 xfree (pending_follow
.execd_pathname
);
1483 stop_pc
= read_pc_pid (ecs
->ptid
);
1484 ecs
->saved_inferior_ptid
= inferior_ptid
;
1485 inferior_ptid
= ecs
->ptid
;
1487 /* Assume that catchpoints are not really software breakpoints. If
1488 some future target implements them using software breakpoints then
1489 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1490 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1491 bpstat_stop_status will not decrement the PC. */
1493 stop_bpstat
= bpstat_stop_status (&stop_pc
, 1);
1495 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1496 inferior_ptid
= ecs
->saved_inferior_ptid
;
1498 /* If no catchpoint triggered for this, then keep going. */
1499 if (ecs
->random_signal
)
1501 stop_signal
= TARGET_SIGNAL_0
;
1505 goto process_event_stop_test
;
1507 /* These syscall events are returned on HP-UX, as part of its
1508 implementation of page-protection-based "hardware" watchpoints.
1509 HP-UX has unfortunate interactions between page-protections and
1510 some system calls. Our solution is to disable hardware watches
1511 when a system call is entered, and reenable them when the syscall
1512 completes. The downside of this is that we may miss the precise
1513 point at which a watched piece of memory is modified. "Oh well."
1515 Note that we may have multiple threads running, which may each
1516 enter syscalls at roughly the same time. Since we don't have a
1517 good notion currently of whether a watched piece of memory is
1518 thread-private, we'd best not have any page-protections active
1519 when any thread is in a syscall. Thus, we only want to reenable
1520 hardware watches when no threads are in a syscall.
1522 Also, be careful not to try to gather much state about a thread
1523 that's in a syscall. It's frequently a losing proposition. */
1524 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1525 number_of_threads_in_syscalls
++;
1526 if (number_of_threads_in_syscalls
== 1)
1528 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1530 resume (0, TARGET_SIGNAL_0
);
1531 prepare_to_wait (ecs
);
1534 /* Before examining the threads further, step this thread to
1535 get it entirely out of the syscall. (We get notice of the
1536 event when the thread is just on the verge of exiting a
1537 syscall. Stepping one instruction seems to get it back
1540 Note that although the logical place to reenable h/w watches
1541 is here, we cannot. We cannot reenable them before stepping
1542 the thread (this causes the next wait on the thread to hang).
1544 Nor can we enable them after stepping until we've done a wait.
1545 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1546 here, which will be serviced immediately after the target
1548 case TARGET_WAITKIND_SYSCALL_RETURN
:
1549 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1551 if (number_of_threads_in_syscalls
> 0)
1553 number_of_threads_in_syscalls
--;
1554 ecs
->enable_hw_watchpoints_after_wait
=
1555 (number_of_threads_in_syscalls
== 0);
1557 prepare_to_wait (ecs
);
1560 case TARGET_WAITKIND_STOPPED
:
1561 stop_signal
= ecs
->ws
.value
.sig
;
1564 /* We had an event in the inferior, but we are not interested
1565 in handling it at this level. The lower layers have already
1566 done what needs to be done, if anything.
1568 One of the possible circumstances for this is when the
1569 inferior produces output for the console. The inferior has
1570 not stopped, and we are ignoring the event. Another possible
1571 circumstance is any event which the lower level knows will be
1572 reported multiple times without an intervening resume. */
1573 case TARGET_WAITKIND_IGNORE
:
1574 prepare_to_wait (ecs
);
1578 /* We may want to consider not doing a resume here in order to give
1579 the user a chance to play with the new thread. It might be good
1580 to make that a user-settable option. */
1582 /* At this point, all threads are stopped (happens automatically in
1583 either the OS or the native code). Therefore we need to continue
1584 all threads in order to make progress. */
1585 if (ecs
->new_thread_event
)
1587 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1588 prepare_to_wait (ecs
);
1592 stop_pc
= read_pc_pid (ecs
->ptid
);
1594 /* See if a thread hit a thread-specific breakpoint that was meant for
1595 another thread. If so, then step that thread past the breakpoint,
1598 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1600 /* Check if a regular breakpoint has been hit before checking
1601 for a potential single step breakpoint. Otherwise, GDB will
1602 not see this breakpoint hit when stepping onto breakpoints. */
1603 if (breakpoints_inserted
1604 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
1606 ecs
->random_signal
= 0;
1607 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
,
1612 /* Saw a breakpoint, but it was hit by the wrong thread.
1614 if (DECR_PC_AFTER_BREAK
)
1615 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
, ecs
->ptid
);
1617 remove_status
= remove_breakpoints ();
1618 /* Did we fail to remove breakpoints? If so, try
1619 to set the PC past the bp. (There's at least
1620 one situation in which we can fail to remove
1621 the bp's: On HP-UX's that use ttrace, we can't
1622 change the address space of a vforking child
1623 process until the child exits (well, okay, not
1624 then either :-) or execs. */
1625 if (remove_status
!= 0)
1627 /* FIXME! This is obviously non-portable! */
1628 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
+ 4, ecs
->ptid
);
1629 /* We need to restart all the threads now,
1630 * unles we're running in scheduler-locked mode.
1631 * Use currently_stepping to determine whether to
1634 /* FIXME MVS: is there any reason not to call resume()? */
1635 if (scheduler_mode
== schedlock_on
)
1636 target_resume (ecs
->ptid
,
1637 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1639 target_resume (RESUME_ALL
,
1640 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1641 prepare_to_wait (ecs
);
1646 breakpoints_inserted
= 0;
1647 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1648 context_switch (ecs
);
1649 ecs
->waiton_ptid
= ecs
->ptid
;
1650 ecs
->wp
= &(ecs
->ws
);
1651 ecs
->another_trap
= 1;
1653 ecs
->infwait_state
= infwait_thread_hop_state
;
1655 registers_changed ();
1660 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1662 /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK
1663 compared to the value it would have if the system stepping
1664 capability was used. This allows the rest of the code in
1665 this function to use this address without having to worry
1666 whether software single step is in use or not. */
1667 if (DECR_PC_AFTER_BREAK
)
1669 stop_pc
-= DECR_PC_AFTER_BREAK
;
1670 write_pc_pid (stop_pc
, ecs
->ptid
);
1673 sw_single_step_trap_p
= 1;
1674 ecs
->random_signal
= 0;
1678 ecs
->random_signal
= 1;
1680 /* See if something interesting happened to the non-current thread. If
1681 so, then switch to that thread, and eventually give control back to
1684 Note that if there's any kind of pending follow (i.e., of a fork,
1685 vfork or exec), we don't want to do this now. Rather, we'll let
1686 the next resume handle it. */
1687 if (!ptid_equal (ecs
->ptid
, inferior_ptid
) &&
1688 (pending_follow
.kind
== TARGET_WAITKIND_SPURIOUS
))
1692 /* If it's a random signal for a non-current thread, notify user
1693 if he's expressed an interest. */
1694 if (ecs
->random_signal
&& signal_print
[stop_signal
])
1696 /* ??rehrauer: I don't understand the rationale for this code. If the
1697 inferior will stop as a result of this signal, then the act of handling
1698 the stop ought to print a message that's couches the stoppage in user
1699 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1700 won't stop as a result of the signal -- i.e., if the signal is merely
1701 a side-effect of something GDB's doing "under the covers" for the
1702 user, such as stepping threads over a breakpoint they shouldn't stop
1703 for -- then the message seems to be a serious annoyance at best.
1705 For now, remove the message altogether. */
1708 target_terminal_ours_for_output ();
1709 printf_filtered ("\nProgram received signal %s, %s.\n",
1710 target_signal_to_name (stop_signal
),
1711 target_signal_to_string (stop_signal
));
1712 gdb_flush (gdb_stdout
);
1716 /* If it's not SIGTRAP and not a signal we want to stop for, then
1717 continue the thread. */
1719 if (stop_signal
!= TARGET_SIGNAL_TRAP
&& !signal_stop
[stop_signal
])
1722 target_terminal_inferior ();
1724 /* Clear the signal if it should not be passed. */
1725 if (signal_program
[stop_signal
] == 0)
1726 stop_signal
= TARGET_SIGNAL_0
;
1728 target_resume (ecs
->ptid
, 0, stop_signal
);
1729 prepare_to_wait (ecs
);
1733 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1734 and fall into the rest of wait_for_inferior(). */
1736 context_switch (ecs
);
1739 context_hook (pid_to_thread_id (ecs
->ptid
));
1741 flush_cached_frames ();
1744 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1746 /* Pull the single step breakpoints out of the target. */
1747 SOFTWARE_SINGLE_STEP (0, 0);
1748 singlestep_breakpoints_inserted_p
= 0;
1751 /* If PC is pointing at a nullified instruction, then step beyond
1752 it so that the user won't be confused when GDB appears to be ready
1755 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1756 if (INSTRUCTION_NULLIFIED
)
1758 registers_changed ();
1759 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1761 /* We may have received a signal that we want to pass to
1762 the inferior; therefore, we must not clobber the waitstatus
1765 ecs
->infwait_state
= infwait_nullified_state
;
1766 ecs
->waiton_ptid
= ecs
->ptid
;
1767 ecs
->wp
= &(ecs
->tmpstatus
);
1768 prepare_to_wait (ecs
);
1772 /* It may not be necessary to disable the watchpoint to stop over
1773 it. For example, the PA can (with some kernel cooperation)
1774 single step over a watchpoint without disabling the watchpoint. */
1775 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1778 prepare_to_wait (ecs
);
1782 /* It is far more common to need to disable a watchpoint to step
1783 the inferior over it. FIXME. What else might a debug
1784 register or page protection watchpoint scheme need here? */
1785 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1787 /* At this point, we are stopped at an instruction which has
1788 attempted to write to a piece of memory under control of
1789 a watchpoint. The instruction hasn't actually executed
1790 yet. If we were to evaluate the watchpoint expression
1791 now, we would get the old value, and therefore no change
1792 would seem to have occurred.
1794 In order to make watchpoints work `right', we really need
1795 to complete the memory write, and then evaluate the
1796 watchpoint expression. The following code does that by
1797 removing the watchpoint (actually, all watchpoints and
1798 breakpoints), single-stepping the target, re-inserting
1799 watchpoints, and then falling through to let normal
1800 single-step processing handle proceed. Since this
1801 includes evaluating watchpoints, things will come to a
1802 stop in the correct manner. */
1804 if (DECR_PC_AFTER_BREAK
)
1805 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
1807 remove_breakpoints ();
1808 registers_changed ();
1809 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1811 ecs
->waiton_ptid
= ecs
->ptid
;
1812 ecs
->wp
= &(ecs
->ws
);
1813 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1814 prepare_to_wait (ecs
);
1818 /* It may be possible to simply continue after a watchpoint. */
1819 if (HAVE_CONTINUABLE_WATCHPOINT
)
1820 STOPPED_BY_WATCHPOINT (ecs
->ws
);
1822 ecs
->stop_func_start
= 0;
1823 ecs
->stop_func_end
= 0;
1824 ecs
->stop_func_name
= 0;
1825 /* Don't care about return value; stop_func_start and stop_func_name
1826 will both be 0 if it doesn't work. */
1827 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1828 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1829 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
1830 ecs
->another_trap
= 0;
1831 bpstat_clear (&stop_bpstat
);
1833 stop_stack_dummy
= 0;
1834 stop_print_frame
= 1;
1835 ecs
->random_signal
= 0;
1836 stopped_by_random_signal
= 0;
1837 breakpoints_failed
= 0;
1839 /* Look at the cause of the stop, and decide what to do.
1840 The alternatives are:
1841 1) break; to really stop and return to the debugger,
1842 2) drop through to start up again
1843 (set ecs->another_trap to 1 to single step once)
1844 3) set ecs->random_signal to 1, and the decision between 1 and 2
1845 will be made according to the signal handling tables. */
1847 /* First, distinguish signals caused by the debugger from signals
1848 that have to do with the program's own actions.
1849 Note that breakpoint insns may cause SIGTRAP or SIGILL
1850 or SIGEMT, depending on the operating system version.
1851 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1852 and change it to SIGTRAP. */
1854 if (stop_signal
== TARGET_SIGNAL_TRAP
1855 || (breakpoints_inserted
&&
1856 (stop_signal
== TARGET_SIGNAL_ILL
1857 || stop_signal
== TARGET_SIGNAL_EMT
))
1858 || stop_soon
== STOP_QUIETLY
1859 || stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1861 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1863 stop_print_frame
= 0;
1864 stop_stepping (ecs
);
1868 /* This is originated from start_remote(), start_inferior() and
1869 shared libraries hook functions. */
1870 if (stop_soon
== STOP_QUIETLY
)
1872 stop_stepping (ecs
);
1876 /* This originates from attach_command(). We need to overwrite
1877 the stop_signal here, because some kernels don't ignore a
1878 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1879 See more comments in inferior.h. */
1880 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1882 stop_stepping (ecs
);
1883 if (stop_signal
== TARGET_SIGNAL_STOP
)
1884 stop_signal
= TARGET_SIGNAL_0
;
1888 /* Don't even think about breakpoints
1889 if just proceeded over a breakpoint.
1891 However, if we are trying to proceed over a breakpoint
1892 and end up in sigtramp, then through_sigtramp_breakpoint
1893 will be set and we should check whether we've hit the
1895 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
1896 && through_sigtramp_breakpoint
== NULL
)
1897 bpstat_clear (&stop_bpstat
);
1900 /* See if there is a breakpoint at the current PC. */
1902 /* The second argument of bpstat_stop_status is meant to help
1903 distinguish between a breakpoint trap and a singlestep trap.
1904 This is only important on targets where DECR_PC_AFTER_BREAK
1905 is non-zero. The prev_pc test is meant to distinguish between
1906 singlestepping a trap instruction, and singlestepping thru a
1907 jump to the instruction following a trap instruction.
1909 Therefore, pass TRUE if our reason for stopping is
1910 something other than hitting a breakpoint. We do this by
1911 checking that either: we detected earlier a software single
1912 step trap or, 1) stepping is going on and 2) we didn't hit
1913 a breakpoint in a signal handler without an intervening stop
1914 in sigtramp, which is detected by a new stack pointer value
1915 below any usual function calling stack adjustments. */
1919 sw_single_step_trap_p
1920 || (currently_stepping (ecs
)
1921 && prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
1923 && INNER_THAN (read_sp (), (step_sp
- 16)))));
1924 /* Following in case break condition called a
1926 stop_print_frame
= 1;
1929 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1930 at one stage in the past included checks for an inferior
1931 function call's call dummy's return breakpoint. The original
1932 comment, that went with the test, read:
1934 ``End of a stack dummy. Some systems (e.g. Sony news) give
1935 another signal besides SIGTRAP, so check here as well as
1938 If someone ever tries to get get call dummys on a
1939 non-executable stack to work (where the target would stop
1940 with something like a SIGSEG), then those tests might need to
1941 be re-instated. Given, however, that the tests were only
1942 enabled when momentary breakpoints were not being used, I
1943 suspect that it won't be the case. */
1945 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1947 = !(bpstat_explains_signal (stop_bpstat
)
1949 || (step_range_end
&& step_resume_breakpoint
== NULL
));
1952 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1953 if (!ecs
->random_signal
)
1954 stop_signal
= TARGET_SIGNAL_TRAP
;
1958 /* When we reach this point, we've pretty much decided
1959 that the reason for stopping must've been a random
1960 (unexpected) signal. */
1963 ecs
->random_signal
= 1;
1965 process_event_stop_test
:
1966 /* For the program's own signals, act according to
1967 the signal handling tables. */
1969 if (ecs
->random_signal
)
1971 /* Signal not for debugging purposes. */
1974 stopped_by_random_signal
= 1;
1976 if (signal_print
[stop_signal
])
1979 target_terminal_ours_for_output ();
1980 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
1982 if (signal_stop
[stop_signal
])
1984 stop_stepping (ecs
);
1987 /* If not going to stop, give terminal back
1988 if we took it away. */
1990 target_terminal_inferior ();
1992 /* Clear the signal if it should not be passed. */
1993 if (signal_program
[stop_signal
] == 0)
1994 stop_signal
= TARGET_SIGNAL_0
;
1996 /* I'm not sure whether this needs to be check_sigtramp2 or
1997 whether it could/should be keep_going.
1999 This used to jump to step_over_function if we are stepping,
2002 Suppose the user does a `next' over a function call, and while
2003 that call is in progress, the inferior receives a signal for
2004 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2005 that case, when we reach this point, there is already a
2006 step-resume breakpoint established, right where it should be:
2007 immediately after the function call the user is "next"-ing
2008 over. If we call step_over_function now, two bad things
2011 - we'll create a new breakpoint, at wherever the current
2012 frame's return address happens to be. That could be
2013 anywhere, depending on what function call happens to be on
2014 the top of the stack at that point. Point is, it's probably
2015 not where we need it.
2017 - the existing step-resume breakpoint (which is at the correct
2018 address) will get orphaned: step_resume_breakpoint will point
2019 to the new breakpoint, and the old step-resume breakpoint
2020 will never be cleaned up.
2022 The old behavior was meant to help HP-UX single-step out of
2023 sigtramps. It would place the new breakpoint at prev_pc, which
2024 was certainly wrong. I don't know the details there, so fixing
2025 this probably breaks that. As with anything else, it's up to
2026 the HP-UX maintainer to furnish a fix that doesn't break other
2027 platforms. --JimB, 20 May 1999 */
2028 check_sigtramp2 (ecs
);
2033 /* Handle cases caused by hitting a breakpoint. */
2035 CORE_ADDR jmp_buf_pc
;
2036 struct bpstat_what what
;
2038 what
= bpstat_what (stop_bpstat
);
2040 if (what
.call_dummy
)
2042 stop_stack_dummy
= 1;
2044 trap_expected_after_continue
= 1;
2048 switch (what
.main_action
)
2050 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2051 /* If we hit the breakpoint at longjmp, disable it for the
2052 duration of this command. Then, install a temporary
2053 breakpoint at the target of the jmp_buf. */
2054 disable_longjmp_breakpoint ();
2055 remove_breakpoints ();
2056 breakpoints_inserted
= 0;
2057 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
2063 /* Need to blow away step-resume breakpoint, as it
2064 interferes with us */
2065 if (step_resume_breakpoint
!= NULL
)
2067 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2069 /* Not sure whether we need to blow this away too, but probably
2070 it is like the step-resume breakpoint. */
2071 if (through_sigtramp_breakpoint
!= NULL
)
2073 delete_breakpoint (through_sigtramp_breakpoint
);
2074 through_sigtramp_breakpoint
= NULL
;
2078 /* FIXME - Need to implement nested temporary breakpoints */
2079 if (step_over_calls
> 0)
2080 set_longjmp_resume_breakpoint (jmp_buf_pc
, get_current_frame ());
2083 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2084 ecs
->handling_longjmp
= 1; /* FIXME */
2088 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2089 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2090 remove_breakpoints ();
2091 breakpoints_inserted
= 0;
2093 /* FIXME - Need to implement nested temporary breakpoints */
2095 && (frame_id_inner (get_frame_id (get_current_frame ()),
2098 ecs
->another_trap
= 1;
2103 disable_longjmp_breakpoint ();
2104 ecs
->handling_longjmp
= 0; /* FIXME */
2105 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2107 /* else fallthrough */
2109 case BPSTAT_WHAT_SINGLE
:
2110 if (breakpoints_inserted
)
2112 remove_breakpoints ();
2114 breakpoints_inserted
= 0;
2115 ecs
->another_trap
= 1;
2116 /* Still need to check other stuff, at least the case
2117 where we are stepping and step out of the right range. */
2120 case BPSTAT_WHAT_STOP_NOISY
:
2121 stop_print_frame
= 1;
2123 /* We are about to nuke the step_resume_breakpoint and
2124 through_sigtramp_breakpoint via the cleanup chain, so
2125 no need to worry about it here. */
2127 stop_stepping (ecs
);
2130 case BPSTAT_WHAT_STOP_SILENT
:
2131 stop_print_frame
= 0;
2133 /* We are about to nuke the step_resume_breakpoint and
2134 through_sigtramp_breakpoint via the cleanup chain, so
2135 no need to worry about it here. */
2137 stop_stepping (ecs
);
2140 case BPSTAT_WHAT_STEP_RESUME
:
2141 /* This proably demands a more elegant solution, but, yeah
2144 This function's use of the simple variable
2145 step_resume_breakpoint doesn't seem to accomodate
2146 simultaneously active step-resume bp's, although the
2147 breakpoint list certainly can.
2149 If we reach here and step_resume_breakpoint is already
2150 NULL, then apparently we have multiple active
2151 step-resume bp's. We'll just delete the breakpoint we
2152 stopped at, and carry on.
2154 Correction: what the code currently does is delete a
2155 step-resume bp, but it makes no effort to ensure that
2156 the one deleted is the one currently stopped at. MVS */
2158 if (step_resume_breakpoint
== NULL
)
2160 step_resume_breakpoint
=
2161 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2163 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2166 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2167 if (through_sigtramp_breakpoint
)
2168 delete_breakpoint (through_sigtramp_breakpoint
);
2169 through_sigtramp_breakpoint
= NULL
;
2171 /* If were waiting for a trap, hitting the step_resume_break
2172 doesn't count as getting it. */
2174 ecs
->another_trap
= 1;
2177 case BPSTAT_WHAT_CHECK_SHLIBS
:
2178 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2181 /* Remove breakpoints, we eventually want to step over the
2182 shlib event breakpoint, and SOLIB_ADD might adjust
2183 breakpoint addresses via breakpoint_re_set. */
2184 if (breakpoints_inserted
)
2185 remove_breakpoints ();
2186 breakpoints_inserted
= 0;
2188 /* Check for any newly added shared libraries if we're
2189 supposed to be adding them automatically. Switch
2190 terminal for any messages produced by
2191 breakpoint_re_set. */
2192 target_terminal_ours_for_output ();
2193 SOLIB_ADD (NULL
, 0, NULL
, auto_solib_add
);
2194 target_terminal_inferior ();
2196 /* Try to reenable shared library breakpoints, additional
2197 code segments in shared libraries might be mapped in now. */
2198 re_enable_breakpoints_in_shlibs ();
2200 /* If requested, stop when the dynamic linker notifies
2201 gdb of events. This allows the user to get control
2202 and place breakpoints in initializer routines for
2203 dynamically loaded objects (among other things). */
2204 if (stop_on_solib_events
)
2206 stop_stepping (ecs
);
2210 /* If we stopped due to an explicit catchpoint, then the
2211 (see above) call to SOLIB_ADD pulled in any symbols
2212 from a newly-loaded library, if appropriate.
2214 We do want the inferior to stop, but not where it is
2215 now, which is in the dynamic linker callback. Rather,
2216 we would like it stop in the user's program, just after
2217 the call that caused this catchpoint to trigger. That
2218 gives the user a more useful vantage from which to
2219 examine their program's state. */
2220 else if (what
.main_action
==
2221 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2223 /* ??rehrauer: If I could figure out how to get the
2224 right return PC from here, we could just set a temp
2225 breakpoint and resume. I'm not sure we can without
2226 cracking open the dld's shared libraries and sniffing
2227 their unwind tables and text/data ranges, and that's
2228 not a terribly portable notion.
2230 Until that time, we must step the inferior out of the
2231 dld callback, and also out of the dld itself (and any
2232 code or stubs in libdld.sl, such as "shl_load" and
2233 friends) until we reach non-dld code. At that point,
2234 we can stop stepping. */
2235 bpstat_get_triggered_catchpoints (stop_bpstat
,
2237 stepping_through_solib_catchpoints
);
2238 ecs
->stepping_through_solib_after_catch
= 1;
2240 /* Be sure to lift all breakpoints, so the inferior does
2241 actually step past this point... */
2242 ecs
->another_trap
= 1;
2247 /* We want to step over this breakpoint, then keep going. */
2248 ecs
->another_trap
= 1;
2255 case BPSTAT_WHAT_LAST
:
2256 /* Not a real code, but listed here to shut up gcc -Wall. */
2258 case BPSTAT_WHAT_KEEP_CHECKING
:
2263 /* We come here if we hit a breakpoint but should not
2264 stop for it. Possibly we also were stepping
2265 and should stop for that. So fall through and
2266 test for stepping. But, if not stepping,
2269 /* Are we stepping to get the inferior out of the dynamic
2270 linker's hook (and possibly the dld itself) after catching
2272 if (ecs
->stepping_through_solib_after_catch
)
2274 #if defined(SOLIB_ADD)
2275 /* Have we reached our destination? If not, keep going. */
2276 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2278 ecs
->another_trap
= 1;
2283 /* Else, stop and report the catchpoint(s) whose triggering
2284 caused us to begin stepping. */
2285 ecs
->stepping_through_solib_after_catch
= 0;
2286 bpstat_clear (&stop_bpstat
);
2287 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2288 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2289 stop_print_frame
= 1;
2290 stop_stepping (ecs
);
2294 if (step_resume_breakpoint
)
2296 /* Having a step-resume breakpoint overrides anything
2297 else having to do with stepping commands until
2298 that breakpoint is reached. */
2299 /* I'm not sure whether this needs to be check_sigtramp2 or
2300 whether it could/should be keep_going. */
2301 check_sigtramp2 (ecs
);
2306 if (step_range_end
== 0)
2308 /* Likewise if we aren't even stepping. */
2309 /* I'm not sure whether this needs to be check_sigtramp2 or
2310 whether it could/should be keep_going. */
2311 check_sigtramp2 (ecs
);
2316 /* If stepping through a line, keep going if still within it.
2318 Note that step_range_end is the address of the first instruction
2319 beyond the step range, and NOT the address of the last instruction
2321 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2323 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2324 So definately need to check for sigtramp here. */
2325 check_sigtramp2 (ecs
);
2330 /* We stepped out of the stepping range. */
2332 /* If we are stepping at the source level and entered the runtime
2333 loader dynamic symbol resolution code, we keep on single stepping
2334 until we exit the run time loader code and reach the callee's
2336 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2337 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2339 CORE_ADDR pc_after_resolver
= SKIP_SOLIB_RESOLVER (stop_pc
);
2341 if (pc_after_resolver
)
2343 /* Set up a step-resume breakpoint at the address
2344 indicated by SKIP_SOLIB_RESOLVER. */
2345 struct symtab_and_line sr_sal
;
2347 sr_sal
.pc
= pc_after_resolver
;
2349 check_for_old_step_resume_breakpoint ();
2350 step_resume_breakpoint
=
2351 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2352 if (breakpoints_inserted
)
2353 insert_breakpoints ();
2360 /* We can't update step_sp every time through the loop, because
2361 reading the stack pointer would slow down stepping too much.
2362 But we can update it every time we leave the step range. */
2363 ecs
->update_step_sp
= 1;
2365 /* Did we just take a signal? */
2366 if (pc_in_sigtramp (stop_pc
)
2367 && !pc_in_sigtramp (prev_pc
)
2368 && INNER_THAN (read_sp (), step_sp
))
2370 /* We've just taken a signal; go until we are back to
2371 the point where we took it and one more. */
2373 /* Note: The test above succeeds not only when we stepped
2374 into a signal handler, but also when we step past the last
2375 statement of a signal handler and end up in the return stub
2376 of the signal handler trampoline. To distinguish between
2377 these two cases, check that the frame is INNER_THAN the
2378 previous one below. pai/1997-09-11 */
2382 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2384 if (frame_id_inner (current_frame
, step_frame_id
))
2386 /* We have just taken a signal; go until we are back to
2387 the point where we took it and one more. */
2389 /* This code is needed at least in the following case:
2390 The user types "next" and then a signal arrives (before
2391 the "next" is done). */
2393 /* Note that if we are stopped at a breakpoint, then we need
2394 the step_resume breakpoint to override any breakpoints at
2395 the same location, so that we will still step over the
2396 breakpoint even though the signal happened. */
2397 struct symtab_and_line sr_sal
;
2400 sr_sal
.symtab
= NULL
;
2402 sr_sal
.pc
= prev_pc
;
2403 /* We could probably be setting the frame to
2404 step_frame_id; I don't think anyone thought to try it. */
2405 check_for_old_step_resume_breakpoint ();
2406 step_resume_breakpoint
=
2407 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2408 if (breakpoints_inserted
)
2409 insert_breakpoints ();
2413 /* We just stepped out of a signal handler and into
2414 its calling trampoline.
2416 Normally, we'd call step_over_function from
2417 here, but for some reason GDB can't unwind the
2418 stack correctly to find the real PC for the point
2419 user code where the signal trampoline will return
2420 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2421 But signal trampolines are pretty small stubs of
2422 code, anyway, so it's OK instead to just
2423 single-step out. Note: assuming such trampolines
2424 don't exhibit recursion on any platform... */
2425 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2426 &ecs
->stop_func_start
,
2427 &ecs
->stop_func_end
);
2428 /* Readjust stepping range */
2429 step_range_start
= ecs
->stop_func_start
;
2430 step_range_end
= ecs
->stop_func_end
;
2431 ecs
->stepping_through_sigtramp
= 1;
2436 /* If this is stepi or nexti, make sure that the stepping range
2437 gets us past that instruction. */
2438 if (step_range_end
== 1)
2439 /* FIXME: Does this run afoul of the code below which, if
2440 we step into the middle of a line, resets the stepping
2442 step_range_end
= (step_range_start
= prev_pc
) + 1;
2444 ecs
->remove_breakpoints_on_following_step
= 1;
2449 if (((stop_pc
== ecs
->stop_func_start
/* Quick test */
2450 || in_prologue (stop_pc
, ecs
->stop_func_start
))
2451 && !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2452 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
)
2453 || ecs
->stop_func_name
== 0)
2455 /* It's a subroutine call. */
2457 if ((step_over_calls
== STEP_OVER_NONE
)
2458 || ((step_range_end
== 1)
2459 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2461 /* I presume that step_over_calls is only 0 when we're
2462 supposed to be stepping at the assembly language level
2463 ("stepi"). Just stop. */
2464 /* Also, maybe we just did a "nexti" inside a prolog,
2465 so we thought it was a subroutine call but it was not.
2466 Stop as well. FENN */
2468 print_stop_reason (END_STEPPING_RANGE
, 0);
2469 stop_stepping (ecs
);
2473 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
2475 /* We're doing a "next". */
2477 if (pc_in_sigtramp (stop_pc
)
2478 && frame_id_inner (step_frame_id
,
2479 frame_id_build (read_sp (), 0)))
2480 /* We stepped out of a signal handler, and into its
2481 calling trampoline. This is misdetected as a
2482 subroutine call, but stepping over the signal
2483 trampoline isn't such a bad idea. In order to do that,
2484 we have to ignore the value in step_frame_id, since
2485 that doesn't represent the frame that'll reach when we
2486 return from the signal trampoline. Otherwise we'll
2487 probably continue to the end of the program. */
2488 step_frame_id
= null_frame_id
;
2490 step_over_function (ecs
);
2495 /* If we are in a function call trampoline (a stub between
2496 the calling routine and the real function), locate the real
2497 function. That's what tells us (a) whether we want to step
2498 into it at all, and (b) what prologue we want to run to
2499 the end of, if we do step into it. */
2500 real_stop_pc
= skip_language_trampoline (stop_pc
);
2501 if (real_stop_pc
== 0)
2502 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2503 if (real_stop_pc
!= 0)
2504 ecs
->stop_func_start
= real_stop_pc
;
2506 /* If we have line number information for the function we
2507 are thinking of stepping into, step into it.
2509 If there are several symtabs at that PC (e.g. with include
2510 files), just want to know whether *any* of them have line
2511 numbers. find_pc_line handles this. */
2513 struct symtab_and_line tmp_sal
;
2515 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2516 if (tmp_sal
.line
!= 0)
2518 step_into_function (ecs
);
2523 /* If we have no line number and the step-stop-if-no-debug
2524 is set, we stop the step so that the user has a chance to
2525 switch in assembly mode. */
2526 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2529 print_stop_reason (END_STEPPING_RANGE
, 0);
2530 stop_stepping (ecs
);
2534 step_over_function (ecs
);
2540 /* We've wandered out of the step range. */
2542 ecs
->sal
= find_pc_line (stop_pc
, 0);
2544 if (step_range_end
== 1)
2546 /* It is stepi or nexti. We always want to stop stepping after
2549 print_stop_reason (END_STEPPING_RANGE
, 0);
2550 stop_stepping (ecs
);
2554 /* If we're in the return path from a shared library trampoline,
2555 we want to proceed through the trampoline when stepping. */
2556 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2558 /* Determine where this trampoline returns. */
2559 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2561 /* Only proceed through if we know where it's going. */
2564 /* And put the step-breakpoint there and go until there. */
2565 struct symtab_and_line sr_sal
;
2567 init_sal (&sr_sal
); /* initialize to zeroes */
2568 sr_sal
.pc
= real_stop_pc
;
2569 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2570 /* Do not specify what the fp should be when we stop
2571 since on some machines the prologue
2572 is where the new fp value is established. */
2573 check_for_old_step_resume_breakpoint ();
2574 step_resume_breakpoint
=
2575 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2576 if (breakpoints_inserted
)
2577 insert_breakpoints ();
2579 /* Restart without fiddling with the step ranges or
2586 if (ecs
->sal
.line
== 0)
2588 /* We have no line number information. That means to stop
2589 stepping (does this always happen right after one instruction,
2590 when we do "s" in a function with no line numbers,
2591 or can this happen as a result of a return or longjmp?). */
2593 print_stop_reason (END_STEPPING_RANGE
, 0);
2594 stop_stepping (ecs
);
2598 if ((stop_pc
== ecs
->sal
.pc
)
2599 && (ecs
->current_line
!= ecs
->sal
.line
2600 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2602 /* We are at the start of a different line. So stop. Note that
2603 we don't stop if we step into the middle of a different line.
2604 That is said to make things like for (;;) statements work
2607 print_stop_reason (END_STEPPING_RANGE
, 0);
2608 stop_stepping (ecs
);
2612 /* We aren't done stepping.
2614 Optimize by setting the stepping range to the line.
2615 (We might not be in the original line, but if we entered a
2616 new line in mid-statement, we continue stepping. This makes
2617 things like for(;;) statements work better.) */
2619 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2621 /* If this is the last line of the function, don't keep stepping
2622 (it would probably step us out of the function).
2623 This is particularly necessary for a one-line function,
2624 in which after skipping the prologue we better stop even though
2625 we will be in mid-line. */
2627 print_stop_reason (END_STEPPING_RANGE
, 0);
2628 stop_stepping (ecs
);
2631 step_range_start
= ecs
->sal
.pc
;
2632 step_range_end
= ecs
->sal
.end
;
2633 step_frame_id
= get_frame_id (get_current_frame ());
2634 ecs
->current_line
= ecs
->sal
.line
;
2635 ecs
->current_symtab
= ecs
->sal
.symtab
;
2637 /* In the case where we just stepped out of a function into the
2638 middle of a line of the caller, continue stepping, but
2639 step_frame_id must be modified to current frame */
2641 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2642 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2643 step_frame_id
= current_frame
;
2649 /* Are we in the middle of stepping? */
2652 currently_stepping (struct execution_control_state
*ecs
)
2654 return ((through_sigtramp_breakpoint
== NULL
2655 && !ecs
->handling_longjmp
2656 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2658 || ecs
->stepping_through_solib_after_catch
2659 || bpstat_should_step ());
2663 check_sigtramp2 (struct execution_control_state
*ecs
)
2666 && pc_in_sigtramp (stop_pc
)
2667 && !pc_in_sigtramp (prev_pc
)
2668 && INNER_THAN (read_sp (), step_sp
))
2670 /* What has happened here is that we have just stepped the
2671 inferior with a signal (because it is a signal which
2672 shouldn't make us stop), thus stepping into sigtramp.
2674 So we need to set a step_resume_break_address breakpoint and
2675 continue until we hit it, and then step. FIXME: This should
2676 be more enduring than a step_resume breakpoint; we should
2677 know that we will later need to keep going rather than
2678 re-hitting the breakpoint here (see the testsuite,
2679 gdb.base/signals.exp where it says "exceedingly difficult"). */
2681 struct symtab_and_line sr_sal
;
2683 init_sal (&sr_sal
); /* initialize to zeroes */
2684 sr_sal
.pc
= prev_pc
;
2685 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2686 /* We perhaps could set the frame if we kept track of what the
2687 frame corresponding to prev_pc was. But we don't, so don't. */
2688 through_sigtramp_breakpoint
=
2689 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_through_sigtramp
);
2690 if (breakpoints_inserted
)
2691 insert_breakpoints ();
2693 ecs
->remove_breakpoints_on_following_step
= 1;
2694 ecs
->another_trap
= 1;
2698 /* Subroutine call with source code we should not step over. Do step
2699 to the first line of code in it. */
2702 step_into_function (struct execution_control_state
*ecs
)
2705 struct symtab_and_line sr_sal
;
2707 s
= find_pc_symtab (stop_pc
);
2708 if (s
&& s
->language
!= language_asm
)
2709 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2711 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2712 /* Use the step_resume_break to step until the end of the prologue,
2713 even if that involves jumps (as it seems to on the vax under
2715 /* If the prologue ends in the middle of a source line, continue to
2716 the end of that source line (if it is still within the function).
2717 Otherwise, just go to end of prologue. */
2718 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2719 /* no, don't either. It skips any code that's legitimately on the
2723 && ecs
->sal
.pc
!= ecs
->stop_func_start
2724 && ecs
->sal
.end
< ecs
->stop_func_end
)
2725 ecs
->stop_func_start
= ecs
->sal
.end
;
2728 if (ecs
->stop_func_start
== stop_pc
)
2730 /* We are already there: stop now. */
2732 print_stop_reason (END_STEPPING_RANGE
, 0);
2733 stop_stepping (ecs
);
2738 /* Put the step-breakpoint there and go until there. */
2739 init_sal (&sr_sal
); /* initialize to zeroes */
2740 sr_sal
.pc
= ecs
->stop_func_start
;
2741 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2742 /* Do not specify what the fp should be when we stop since on
2743 some machines the prologue is where the new fp value is
2745 check_for_old_step_resume_breakpoint ();
2746 step_resume_breakpoint
=
2747 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2748 if (breakpoints_inserted
)
2749 insert_breakpoints ();
2751 /* And make sure stepping stops right away then. */
2752 step_range_end
= step_range_start
;
2757 /* We've just entered a callee, and we wish to resume until it returns
2758 to the caller. Setting a step_resume breakpoint on the return
2759 address will catch a return from the callee.
2761 However, if the callee is recursing, we want to be careful not to
2762 catch returns of those recursive calls, but only of THIS instance
2765 To do this, we set the step_resume bp's frame to our current
2766 caller's frame (step_frame_id, which is set by the "next" or
2767 "until" command, before execution begins). */
2770 step_over_function (struct execution_control_state
*ecs
)
2772 struct symtab_and_line sr_sal
;
2774 init_sal (&sr_sal
); /* initialize to zeros */
2776 /* NOTE: cagney/2003-04-06:
2778 At this point the equality get_frame_pc() == get_frame_func()
2779 should hold. This may make it possible for this code to tell the
2780 frame where it's function is, instead of the reverse. This would
2781 avoid the need to search for the frame's function, which can get
2782 very messy when there is no debug info available (look at the
2783 heuristic find pc start code found in targets like the MIPS). */
2785 /* NOTE: cagney/2003-04-06:
2787 The intent of DEPRECATED_SAVED_PC_AFTER_CALL was to:
2789 - provide a very light weight equivalent to frame_unwind_pc()
2790 (nee FRAME_SAVED_PC) that avoids the prologue analyzer
2792 - avoid handling the case where the PC hasn't been saved in the
2795 Unfortunatly, not five lines further down, is a call to
2796 get_frame_id() and that is guarenteed to trigger the prologue
2799 The `correct fix' is for the prologe analyzer to handle the case
2800 where the prologue is incomplete (PC in prologue) and,
2801 consequently, the return pc has not yet been saved. It should be
2802 noted that the prologue analyzer needs to handle this case
2803 anyway: frameless leaf functions that don't save the return PC;
2804 single stepping through a prologue.
2806 The d10v handles all this by bailing out of the prologue analsis
2807 when it reaches the current instruction. */
2809 if (DEPRECATED_SAVED_PC_AFTER_CALL_P ())
2810 sr_sal
.pc
= ADDR_BITS_REMOVE (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ()));
2812 sr_sal
.pc
= ADDR_BITS_REMOVE (frame_pc_unwind (get_current_frame ()));
2813 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2815 check_for_old_step_resume_breakpoint ();
2816 step_resume_breakpoint
=
2817 set_momentary_breakpoint (sr_sal
, get_frame_id (get_current_frame ()),
2820 if (frame_id_p (step_frame_id
)
2821 && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal
.pc
))
2822 step_resume_breakpoint
->frame_id
= step_frame_id
;
2824 if (breakpoints_inserted
)
2825 insert_breakpoints ();
2829 stop_stepping (struct execution_control_state
*ecs
)
2831 /* Let callers know we don't want to wait for the inferior anymore. */
2832 ecs
->wait_some_more
= 0;
2835 /* This function handles various cases where we need to continue
2836 waiting for the inferior. */
2837 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2840 keep_going (struct execution_control_state
*ecs
)
2842 /* Save the pc before execution, to compare with pc after stop. */
2843 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2845 if (ecs
->update_step_sp
)
2846 step_sp
= read_sp ();
2847 ecs
->update_step_sp
= 0;
2849 /* If we did not do break;, it means we should keep running the
2850 inferior and not return to debugger. */
2852 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2854 /* We took a signal (which we are supposed to pass through to
2855 the inferior, else we'd have done a break above) and we
2856 haven't yet gotten our trap. Simply continue. */
2857 resume (currently_stepping (ecs
), stop_signal
);
2861 /* Either the trap was not expected, but we are continuing
2862 anyway (the user asked that this signal be passed to the
2865 The signal was SIGTRAP, e.g. it was our signal, but we
2866 decided we should resume from it.
2868 We're going to run this baby now!
2870 Insert breakpoints now, unless we are trying to one-proceed
2871 past a breakpoint. */
2872 /* If we've just finished a special step resume and we don't
2873 want to hit a breakpoint, pull em out. */
2874 if (step_resume_breakpoint
== NULL
2875 && through_sigtramp_breakpoint
== NULL
2876 && ecs
->remove_breakpoints_on_following_step
)
2878 ecs
->remove_breakpoints_on_following_step
= 0;
2879 remove_breakpoints ();
2880 breakpoints_inserted
= 0;
2882 else if (!breakpoints_inserted
&&
2883 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
2885 breakpoints_failed
= insert_breakpoints ();
2886 if (breakpoints_failed
)
2888 stop_stepping (ecs
);
2891 breakpoints_inserted
= 1;
2894 trap_expected
= ecs
->another_trap
;
2896 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2897 specifies that such a signal should be delivered to the
2900 Typically, this would occure when a user is debugging a
2901 target monitor on a simulator: the target monitor sets a
2902 breakpoint; the simulator encounters this break-point and
2903 halts the simulation handing control to GDB; GDB, noteing
2904 that the break-point isn't valid, returns control back to the
2905 simulator; the simulator then delivers the hardware
2906 equivalent of a SIGNAL_TRAP to the program being debugged. */
2908 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2909 stop_signal
= TARGET_SIGNAL_0
;
2911 #ifdef SHIFT_INST_REGS
2912 /* I'm not sure when this following segment applies. I do know,
2913 now, that we shouldn't rewrite the regs when we were stopped
2914 by a random signal from the inferior process. */
2915 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2916 (this is only used on the 88k). */
2918 if (!bpstat_explains_signal (stop_bpstat
)
2919 && (stop_signal
!= TARGET_SIGNAL_CHLD
) && !stopped_by_random_signal
)
2921 #endif /* SHIFT_INST_REGS */
2923 resume (currently_stepping (ecs
), stop_signal
);
2926 prepare_to_wait (ecs
);
2929 /* This function normally comes after a resume, before
2930 handle_inferior_event exits. It takes care of any last bits of
2931 housekeeping, and sets the all-important wait_some_more flag. */
2934 prepare_to_wait (struct execution_control_state
*ecs
)
2936 if (ecs
->infwait_state
== infwait_normal_state
)
2938 overlay_cache_invalid
= 1;
2940 /* We have to invalidate the registers BEFORE calling
2941 target_wait because they can be loaded from the target while
2942 in target_wait. This makes remote debugging a bit more
2943 efficient for those targets that provide critical registers
2944 as part of their normal status mechanism. */
2946 registers_changed ();
2947 ecs
->waiton_ptid
= pid_to_ptid (-1);
2948 ecs
->wp
= &(ecs
->ws
);
2950 /* This is the old end of the while loop. Let everybody know we
2951 want to wait for the inferior some more and get called again
2953 ecs
->wait_some_more
= 1;
2956 /* Print why the inferior has stopped. We always print something when
2957 the inferior exits, or receives a signal. The rest of the cases are
2958 dealt with later on in normal_stop() and print_it_typical(). Ideally
2959 there should be a call to this function from handle_inferior_event()
2960 each time stop_stepping() is called.*/
2962 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
2964 switch (stop_reason
)
2967 /* We don't deal with these cases from handle_inferior_event()
2970 case END_STEPPING_RANGE
:
2971 /* We are done with a step/next/si/ni command. */
2972 /* For now print nothing. */
2973 /* Print a message only if not in the middle of doing a "step n"
2974 operation for n > 1 */
2975 if (!step_multi
|| !stop_step
)
2976 if (ui_out_is_mi_like_p (uiout
))
2977 ui_out_field_string (uiout
, "reason", "end-stepping-range");
2979 case BREAKPOINT_HIT
:
2980 /* We found a breakpoint. */
2981 /* For now print nothing. */
2984 /* The inferior was terminated by a signal. */
2985 annotate_signalled ();
2986 if (ui_out_is_mi_like_p (uiout
))
2987 ui_out_field_string (uiout
, "reason", "exited-signalled");
2988 ui_out_text (uiout
, "\nProgram terminated with signal ");
2989 annotate_signal_name ();
2990 ui_out_field_string (uiout
, "signal-name",
2991 target_signal_to_name (stop_info
));
2992 annotate_signal_name_end ();
2993 ui_out_text (uiout
, ", ");
2994 annotate_signal_string ();
2995 ui_out_field_string (uiout
, "signal-meaning",
2996 target_signal_to_string (stop_info
));
2997 annotate_signal_string_end ();
2998 ui_out_text (uiout
, ".\n");
2999 ui_out_text (uiout
, "The program no longer exists.\n");
3002 /* The inferior program is finished. */
3003 annotate_exited (stop_info
);
3006 if (ui_out_is_mi_like_p (uiout
))
3007 ui_out_field_string (uiout
, "reason", "exited");
3008 ui_out_text (uiout
, "\nProgram exited with code ");
3009 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3010 (unsigned int) stop_info
);
3011 ui_out_text (uiout
, ".\n");
3015 if (ui_out_is_mi_like_p (uiout
))
3016 ui_out_field_string (uiout
, "reason", "exited-normally");
3017 ui_out_text (uiout
, "\nProgram exited normally.\n");
3020 case SIGNAL_RECEIVED
:
3021 /* Signal received. The signal table tells us to print about
3024 ui_out_text (uiout
, "\nProgram received signal ");
3025 annotate_signal_name ();
3026 if (ui_out_is_mi_like_p (uiout
))
3027 ui_out_field_string (uiout
, "reason", "signal-received");
3028 ui_out_field_string (uiout
, "signal-name",
3029 target_signal_to_name (stop_info
));
3030 annotate_signal_name_end ();
3031 ui_out_text (uiout
, ", ");
3032 annotate_signal_string ();
3033 ui_out_field_string (uiout
, "signal-meaning",
3034 target_signal_to_string (stop_info
));
3035 annotate_signal_string_end ();
3036 ui_out_text (uiout
, ".\n");
3039 internal_error (__FILE__
, __LINE__
,
3040 "print_stop_reason: unrecognized enum value");
3046 /* Here to return control to GDB when the inferior stops for real.
3047 Print appropriate messages, remove breakpoints, give terminal our modes.
3049 STOP_PRINT_FRAME nonzero means print the executing frame
3050 (pc, function, args, file, line number and line text).
3051 BREAKPOINTS_FAILED nonzero means stop was due to error
3052 attempting to insert breakpoints. */
3057 struct target_waitstatus last
;
3060 get_last_target_status (&last_ptid
, &last
);
3062 /* As with the notification of thread events, we want to delay
3063 notifying the user that we've switched thread context until
3064 the inferior actually stops.
3066 There's no point in saying anything if the inferior has exited.
3067 Note that SIGNALLED here means "exited with a signal", not
3068 "received a signal". */
3069 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3070 && target_has_execution
3071 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3072 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3074 target_terminal_ours_for_output ();
3075 printf_filtered ("[Switching to %s]\n",
3076 target_pid_or_tid_to_str (inferior_ptid
));
3077 previous_inferior_ptid
= inferior_ptid
;
3080 /* Make sure that the current_frame's pc is correct. This
3081 is a correction for setting up the frame info before doing
3082 DECR_PC_AFTER_BREAK */
3083 if (target_has_execution
)
3084 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3085 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3086 frame code to check for this and sort out any resultant mess.
3087 DECR_PC_AFTER_BREAK needs to just go away. */
3088 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3090 if (target_has_execution
&& breakpoints_inserted
)
3092 if (remove_breakpoints ())
3094 target_terminal_ours_for_output ();
3095 printf_filtered ("Cannot remove breakpoints because ");
3096 printf_filtered ("program is no longer writable.\n");
3097 printf_filtered ("It might be running in another process.\n");
3098 printf_filtered ("Further execution is probably impossible.\n");
3101 breakpoints_inserted
= 0;
3103 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3104 Delete any breakpoint that is to be deleted at the next stop. */
3106 breakpoint_auto_delete (stop_bpstat
);
3108 /* If an auto-display called a function and that got a signal,
3109 delete that auto-display to avoid an infinite recursion. */
3111 if (stopped_by_random_signal
)
3112 disable_current_display ();
3114 /* Don't print a message if in the middle of doing a "step n"
3115 operation for n > 1 */
3116 if (step_multi
&& stop_step
)
3119 target_terminal_ours ();
3121 /* Look up the hook_stop and run it (CLI internally handles problem
3122 of stop_command's pre-hook not existing). */
3124 catch_errors (hook_stop_stub
, stop_command
,
3125 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3127 if (!target_has_stack
)
3133 /* Select innermost stack frame - i.e., current frame is frame 0,
3134 and current location is based on that.
3135 Don't do this on return from a stack dummy routine,
3136 or if the program has exited. */
3138 if (!stop_stack_dummy
)
3140 select_frame (get_current_frame ());
3142 /* Print current location without a level number, if
3143 we have changed functions or hit a breakpoint.
3144 Print source line if we have one.
3145 bpstat_print() contains the logic deciding in detail
3146 what to print, based on the event(s) that just occurred. */
3148 if (stop_print_frame
&& deprecated_selected_frame
)
3152 int do_frame_printing
= 1;
3154 bpstat_ret
= bpstat_print (stop_bpstat
);
3158 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3159 (or should) carry around the function and does (or
3160 should) use that when doing a frame comparison. */
3162 && frame_id_eq (step_frame_id
,
3163 get_frame_id (get_current_frame ()))
3164 && step_start_function
== find_pc_function (stop_pc
))
3165 source_flag
= SRC_LINE
; /* finished step, just print source line */
3167 source_flag
= SRC_AND_LOC
; /* print location and source line */
3169 case PRINT_SRC_AND_LOC
:
3170 source_flag
= SRC_AND_LOC
; /* print location and source line */
3172 case PRINT_SRC_ONLY
:
3173 source_flag
= SRC_LINE
;
3176 source_flag
= SRC_LINE
; /* something bogus */
3177 do_frame_printing
= 0;
3180 internal_error (__FILE__
, __LINE__
, "Unknown value.");
3182 /* For mi, have the same behavior every time we stop:
3183 print everything but the source line. */
3184 if (ui_out_is_mi_like_p (uiout
))
3185 source_flag
= LOC_AND_ADDRESS
;
3187 if (ui_out_is_mi_like_p (uiout
))
3188 ui_out_field_int (uiout
, "thread-id",
3189 pid_to_thread_id (inferior_ptid
));
3190 /* The behavior of this routine with respect to the source
3192 SRC_LINE: Print only source line
3193 LOCATION: Print only location
3194 SRC_AND_LOC: Print location and source line */
3195 if (do_frame_printing
)
3196 print_stack_frame (deprecated_selected_frame
, -1, source_flag
);
3198 /* Display the auto-display expressions. */
3203 /* Save the function value return registers, if we care.
3204 We might be about to restore their previous contents. */
3205 if (proceed_to_finish
)
3206 /* NB: The copy goes through to the target picking up the value of
3207 all the registers. */
3208 regcache_cpy (stop_registers
, current_regcache
);
3210 if (stop_stack_dummy
)
3212 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3213 ends with a setting of the current frame, so we can use that
3215 frame_pop (get_current_frame ());
3216 /* Set stop_pc to what it was before we called the function.
3217 Can't rely on restore_inferior_status because that only gets
3218 called if we don't stop in the called function. */
3219 stop_pc
= read_pc ();
3220 select_frame (get_current_frame ());
3224 annotate_stopped ();
3225 observer_notify_normal_stop ();
3229 hook_stop_stub (void *cmd
)
3231 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3236 signal_stop_state (int signo
)
3238 return signal_stop
[signo
];
3242 signal_print_state (int signo
)
3244 return signal_print
[signo
];
3248 signal_pass_state (int signo
)
3250 return signal_program
[signo
];
3254 signal_stop_update (int signo
, int state
)
3256 int ret
= signal_stop
[signo
];
3257 signal_stop
[signo
] = state
;
3262 signal_print_update (int signo
, int state
)
3264 int ret
= signal_print
[signo
];
3265 signal_print
[signo
] = state
;
3270 signal_pass_update (int signo
, int state
)
3272 int ret
= signal_program
[signo
];
3273 signal_program
[signo
] = state
;
3278 sig_print_header (void)
3281 Signal Stop\tPrint\tPass to program\tDescription\n");
3285 sig_print_info (enum target_signal oursig
)
3287 char *name
= target_signal_to_name (oursig
);
3288 int name_padding
= 13 - strlen (name
);
3290 if (name_padding
<= 0)
3293 printf_filtered ("%s", name
);
3294 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3295 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3296 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3297 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3298 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3301 /* Specify how various signals in the inferior should be handled. */
3304 handle_command (char *args
, int from_tty
)
3307 int digits
, wordlen
;
3308 int sigfirst
, signum
, siglast
;
3309 enum target_signal oursig
;
3312 unsigned char *sigs
;
3313 struct cleanup
*old_chain
;
3317 error_no_arg ("signal to handle");
3320 /* Allocate and zero an array of flags for which signals to handle. */
3322 nsigs
= (int) TARGET_SIGNAL_LAST
;
3323 sigs
= (unsigned char *) alloca (nsigs
);
3324 memset (sigs
, 0, nsigs
);
3326 /* Break the command line up into args. */
3328 argv
= buildargv (args
);
3333 old_chain
= make_cleanup_freeargv (argv
);
3335 /* Walk through the args, looking for signal oursigs, signal names, and
3336 actions. Signal numbers and signal names may be interspersed with
3337 actions, with the actions being performed for all signals cumulatively
3338 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3340 while (*argv
!= NULL
)
3342 wordlen
= strlen (*argv
);
3343 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3347 sigfirst
= siglast
= -1;
3349 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3351 /* Apply action to all signals except those used by the
3352 debugger. Silently skip those. */
3355 siglast
= nsigs
- 1;
3357 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3359 SET_SIGS (nsigs
, sigs
, signal_stop
);
3360 SET_SIGS (nsigs
, sigs
, signal_print
);
3362 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3364 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3366 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3368 SET_SIGS (nsigs
, sigs
, signal_print
);
3370 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3372 SET_SIGS (nsigs
, sigs
, signal_program
);
3374 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3376 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3378 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3380 SET_SIGS (nsigs
, sigs
, signal_program
);
3382 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3384 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3385 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3387 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3389 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3391 else if (digits
> 0)
3393 /* It is numeric. The numeric signal refers to our own
3394 internal signal numbering from target.h, not to host/target
3395 signal number. This is a feature; users really should be
3396 using symbolic names anyway, and the common ones like
3397 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3399 sigfirst
= siglast
= (int)
3400 target_signal_from_command (atoi (*argv
));
3401 if ((*argv
)[digits
] == '-')
3404 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3406 if (sigfirst
> siglast
)
3408 /* Bet he didn't figure we'd think of this case... */
3416 oursig
= target_signal_from_name (*argv
);
3417 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3419 sigfirst
= siglast
= (int) oursig
;
3423 /* Not a number and not a recognized flag word => complain. */
3424 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3428 /* If any signal numbers or symbol names were found, set flags for
3429 which signals to apply actions to. */
3431 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3433 switch ((enum target_signal
) signum
)
3435 case TARGET_SIGNAL_TRAP
:
3436 case TARGET_SIGNAL_INT
:
3437 if (!allsigs
&& !sigs
[signum
])
3439 if (query ("%s is used by the debugger.\n\
3440 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3446 printf_unfiltered ("Not confirmed, unchanged.\n");
3447 gdb_flush (gdb_stdout
);
3451 case TARGET_SIGNAL_0
:
3452 case TARGET_SIGNAL_DEFAULT
:
3453 case TARGET_SIGNAL_UNKNOWN
:
3454 /* Make sure that "all" doesn't print these. */
3465 target_notice_signals (inferior_ptid
);
3469 /* Show the results. */
3470 sig_print_header ();
3471 for (signum
= 0; signum
< nsigs
; signum
++)
3475 sig_print_info (signum
);
3480 do_cleanups (old_chain
);
3484 xdb_handle_command (char *args
, int from_tty
)
3487 struct cleanup
*old_chain
;
3489 /* Break the command line up into args. */
3491 argv
= buildargv (args
);
3496 old_chain
= make_cleanup_freeargv (argv
);
3497 if (argv
[1] != (char *) NULL
)
3502 bufLen
= strlen (argv
[0]) + 20;
3503 argBuf
= (char *) xmalloc (bufLen
);
3507 enum target_signal oursig
;
3509 oursig
= target_signal_from_name (argv
[0]);
3510 memset (argBuf
, 0, bufLen
);
3511 if (strcmp (argv
[1], "Q") == 0)
3512 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3515 if (strcmp (argv
[1], "s") == 0)
3517 if (!signal_stop
[oursig
])
3518 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3520 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3522 else if (strcmp (argv
[1], "i") == 0)
3524 if (!signal_program
[oursig
])
3525 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3527 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3529 else if (strcmp (argv
[1], "r") == 0)
3531 if (!signal_print
[oursig
])
3532 sprintf (argBuf
, "%s %s", argv
[0], "print");
3534 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3540 handle_command (argBuf
, from_tty
);
3542 printf_filtered ("Invalid signal handling flag.\n");
3547 do_cleanups (old_chain
);
3550 /* Print current contents of the tables set by the handle command.
3551 It is possible we should just be printing signals actually used
3552 by the current target (but for things to work right when switching
3553 targets, all signals should be in the signal tables). */
3556 signals_info (char *signum_exp
, int from_tty
)
3558 enum target_signal oursig
;
3559 sig_print_header ();
3563 /* First see if this is a symbol name. */
3564 oursig
= target_signal_from_name (signum_exp
);
3565 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3567 /* No, try numeric. */
3569 target_signal_from_command (parse_and_eval_long (signum_exp
));
3571 sig_print_info (oursig
);
3575 printf_filtered ("\n");
3576 /* These ugly casts brought to you by the native VAX compiler. */
3577 for (oursig
= TARGET_SIGNAL_FIRST
;
3578 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3579 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3583 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3584 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3585 sig_print_info (oursig
);
3588 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3591 struct inferior_status
3593 enum target_signal stop_signal
;
3597 int stop_stack_dummy
;
3598 int stopped_by_random_signal
;
3600 CORE_ADDR step_range_start
;
3601 CORE_ADDR step_range_end
;
3602 struct frame_id step_frame_id
;
3603 enum step_over_calls_kind step_over_calls
;
3604 CORE_ADDR step_resume_break_address
;
3605 int stop_after_trap
;
3607 struct regcache
*stop_registers
;
3609 /* These are here because if call_function_by_hand has written some
3610 registers and then decides to call error(), we better not have changed
3612 struct regcache
*registers
;
3614 /* A frame unique identifier. */
3615 struct frame_id selected_frame_id
;
3617 int breakpoint_proceeded
;
3618 int restore_stack_info
;
3619 int proceed_to_finish
;
3623 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3626 int size
= REGISTER_RAW_SIZE (regno
);
3627 void *buf
= alloca (size
);
3628 store_signed_integer (buf
, size
, val
);
3629 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3632 /* Save all of the information associated with the inferior<==>gdb
3633 connection. INF_STATUS is a pointer to a "struct inferior_status"
3634 (defined in inferior.h). */
3636 struct inferior_status
*
3637 save_inferior_status (int restore_stack_info
)
3639 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3641 inf_status
->stop_signal
= stop_signal
;
3642 inf_status
->stop_pc
= stop_pc
;
3643 inf_status
->stop_step
= stop_step
;
3644 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3645 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3646 inf_status
->trap_expected
= trap_expected
;
3647 inf_status
->step_range_start
= step_range_start
;
3648 inf_status
->step_range_end
= step_range_end
;
3649 inf_status
->step_frame_id
= step_frame_id
;
3650 inf_status
->step_over_calls
= step_over_calls
;
3651 inf_status
->stop_after_trap
= stop_after_trap
;
3652 inf_status
->stop_soon
= stop_soon
;
3653 /* Save original bpstat chain here; replace it with copy of chain.
3654 If caller's caller is walking the chain, they'll be happier if we
3655 hand them back the original chain when restore_inferior_status is
3657 inf_status
->stop_bpstat
= stop_bpstat
;
3658 stop_bpstat
= bpstat_copy (stop_bpstat
);
3659 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3660 inf_status
->restore_stack_info
= restore_stack_info
;
3661 inf_status
->proceed_to_finish
= proceed_to_finish
;
3663 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3665 inf_status
->registers
= regcache_dup (current_regcache
);
3667 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3672 restore_selected_frame (void *args
)
3674 struct frame_id
*fid
= (struct frame_id
*) args
;
3675 struct frame_info
*frame
;
3677 frame
= frame_find_by_id (*fid
);
3679 /* If inf_status->selected_frame_id is NULL, there was no previously
3683 warning ("Unable to restore previously selected frame.\n");
3687 select_frame (frame
);
3693 restore_inferior_status (struct inferior_status
*inf_status
)
3695 stop_signal
= inf_status
->stop_signal
;
3696 stop_pc
= inf_status
->stop_pc
;
3697 stop_step
= inf_status
->stop_step
;
3698 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3699 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3700 trap_expected
= inf_status
->trap_expected
;
3701 step_range_start
= inf_status
->step_range_start
;
3702 step_range_end
= inf_status
->step_range_end
;
3703 step_frame_id
= inf_status
->step_frame_id
;
3704 step_over_calls
= inf_status
->step_over_calls
;
3705 stop_after_trap
= inf_status
->stop_after_trap
;
3706 stop_soon
= inf_status
->stop_soon
;
3707 bpstat_clear (&stop_bpstat
);
3708 stop_bpstat
= inf_status
->stop_bpstat
;
3709 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3710 proceed_to_finish
= inf_status
->proceed_to_finish
;
3712 /* FIXME: Is the restore of stop_registers always needed. */
3713 regcache_xfree (stop_registers
);
3714 stop_registers
= inf_status
->stop_registers
;
3716 /* The inferior can be gone if the user types "print exit(0)"
3717 (and perhaps other times). */
3718 if (target_has_execution
)
3719 /* NB: The register write goes through to the target. */
3720 regcache_cpy (current_regcache
, inf_status
->registers
);
3721 regcache_xfree (inf_status
->registers
);
3723 /* FIXME: If we are being called after stopping in a function which
3724 is called from gdb, we should not be trying to restore the
3725 selected frame; it just prints a spurious error message (The
3726 message is useful, however, in detecting bugs in gdb (like if gdb
3727 clobbers the stack)). In fact, should we be restoring the
3728 inferior status at all in that case? . */
3730 if (target_has_stack
&& inf_status
->restore_stack_info
)
3732 /* The point of catch_errors is that if the stack is clobbered,
3733 walking the stack might encounter a garbage pointer and
3734 error() trying to dereference it. */
3736 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3737 "Unable to restore previously selected frame:\n",
3738 RETURN_MASK_ERROR
) == 0)
3739 /* Error in restoring the selected frame. Select the innermost
3741 select_frame (get_current_frame ());
3749 do_restore_inferior_status_cleanup (void *sts
)
3751 restore_inferior_status (sts
);
3755 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3757 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3761 discard_inferior_status (struct inferior_status
*inf_status
)
3763 /* See save_inferior_status for info on stop_bpstat. */
3764 bpstat_clear (&inf_status
->stop_bpstat
);
3765 regcache_xfree (inf_status
->registers
);
3766 regcache_xfree (inf_status
->stop_registers
);
3771 inferior_has_forked (int pid
, int *child_pid
)
3773 struct target_waitstatus last
;
3776 get_last_target_status (&last_ptid
, &last
);
3778 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3781 if (ptid_get_pid (last_ptid
) != pid
)
3784 *child_pid
= last
.value
.related_pid
;
3789 inferior_has_vforked (int pid
, int *child_pid
)
3791 struct target_waitstatus last
;
3794 get_last_target_status (&last_ptid
, &last
);
3796 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3799 if (ptid_get_pid (last_ptid
) != pid
)
3802 *child_pid
= last
.value
.related_pid
;
3807 inferior_has_execd (int pid
, char **execd_pathname
)
3809 struct target_waitstatus last
;
3812 get_last_target_status (&last_ptid
, &last
);
3814 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3817 if (ptid_get_pid (last_ptid
) != pid
)
3820 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3824 /* Oft used ptids */
3826 ptid_t minus_one_ptid
;
3828 /* Create a ptid given the necessary PID, LWP, and TID components. */
3831 ptid_build (int pid
, long lwp
, long tid
)
3841 /* Create a ptid from just a pid. */
3844 pid_to_ptid (int pid
)
3846 return ptid_build (pid
, 0, 0);
3849 /* Fetch the pid (process id) component from a ptid. */
3852 ptid_get_pid (ptid_t ptid
)
3857 /* Fetch the lwp (lightweight process) component from a ptid. */
3860 ptid_get_lwp (ptid_t ptid
)
3865 /* Fetch the tid (thread id) component from a ptid. */
3868 ptid_get_tid (ptid_t ptid
)
3873 /* ptid_equal() is used to test equality of two ptids. */
3876 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3878 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3879 && ptid1
.tid
== ptid2
.tid
);
3882 /* restore_inferior_ptid() will be used by the cleanup machinery
3883 to restore the inferior_ptid value saved in a call to
3884 save_inferior_ptid(). */
3887 restore_inferior_ptid (void *arg
)
3889 ptid_t
*saved_ptid_ptr
= arg
;
3890 inferior_ptid
= *saved_ptid_ptr
;
3894 /* Save the value of inferior_ptid so that it may be restored by a
3895 later call to do_cleanups(). Returns the struct cleanup pointer
3896 needed for later doing the cleanup. */
3899 save_inferior_ptid (void)
3901 ptid_t
*saved_ptid_ptr
;
3903 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3904 *saved_ptid_ptr
= inferior_ptid
;
3905 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3912 stop_registers
= regcache_xmalloc (current_gdbarch
);
3916 _initialize_infrun (void)
3920 struct cmd_list_element
*c
;
3922 register_gdbarch_swap (&stop_registers
, sizeof (stop_registers
), NULL
);
3923 register_gdbarch_swap (NULL
, 0, build_infrun
);
3925 add_info ("signals", signals_info
,
3926 "What debugger does when program gets various signals.\n\
3927 Specify a signal as argument to print info on that signal only.");
3928 add_info_alias ("handle", "signals", 0);
3930 add_com ("handle", class_run
, handle_command
,
3931 concat ("Specify how to handle a signal.\n\
3932 Args are signals and actions to apply to those signals.\n\
3933 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3934 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3935 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3936 The special arg \"all\" is recognized to mean all signals except those\n\
3937 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3938 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3939 Stop means reenter debugger if this signal happens (implies print).\n\
3940 Print means print a message if this signal happens.\n\
3941 Pass means let program see this signal; otherwise program doesn't know.\n\
3942 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3943 Pass and Stop may be combined.", NULL
));
3946 add_com ("lz", class_info
, signals_info
,
3947 "What debugger does when program gets various signals.\n\
3948 Specify a signal as argument to print info on that signal only.");
3949 add_com ("z", class_run
, xdb_handle_command
,
3950 concat ("Specify how to handle a signal.\n\
3951 Args are signals and actions to apply to those signals.\n\
3952 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3953 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3954 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3955 The special arg \"all\" is recognized to mean all signals except those\n\
3956 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3957 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3958 nopass), \"Q\" (noprint)\n\
3959 Stop means reenter debugger if this signal happens (implies print).\n\
3960 Print means print a message if this signal happens.\n\
3961 Pass means let program see this signal; otherwise program doesn't know.\n\
3962 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3963 Pass and Stop may be combined.", NULL
));
3968 add_cmd ("stop", class_obscure
, not_just_help_class_command
, "There is no `stop' command, but you can set a hook on `stop'.\n\
3969 This allows you to set a list of commands to be run each time execution\n\
3970 of the program stops.", &cmdlist
);
3972 numsigs
= (int) TARGET_SIGNAL_LAST
;
3973 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3974 signal_print
= (unsigned char *)
3975 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3976 signal_program
= (unsigned char *)
3977 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3978 for (i
= 0; i
< numsigs
; i
++)
3981 signal_print
[i
] = 1;
3982 signal_program
[i
] = 1;
3985 /* Signals caused by debugger's own actions
3986 should not be given to the program afterwards. */
3987 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3988 signal_program
[TARGET_SIGNAL_INT
] = 0;
3990 /* Signals that are not errors should not normally enter the debugger. */
3991 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3992 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3993 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3994 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3995 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3996 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3997 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3998 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3999 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4000 signal_print
[TARGET_SIGNAL_IO
] = 0;
4001 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4002 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4003 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4004 signal_print
[TARGET_SIGNAL_URG
] = 0;
4005 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4006 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4008 /* These signals are used internally by user-level thread
4009 implementations. (See signal(5) on Solaris.) Like the above
4010 signals, a healthy program receives and handles them as part of
4011 its normal operation. */
4012 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4013 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4014 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4015 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4016 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4017 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4021 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
4022 (char *) &stop_on_solib_events
,
4023 "Set stopping for shared library events.\n\
4024 If nonzero, gdb will give control to the user when the dynamic linker\n\
4025 notifies gdb of shared library events. The most common event of interest\n\
4026 to the user would be loading/unloading of a new library.\n", &setlist
), &showlist
);
4029 c
= add_set_enum_cmd ("follow-fork-mode",
4031 follow_fork_mode_kind_names
, &follow_fork_mode_string
,
4032 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4033 kernel problem. It's also not terribly useful without a GUI to
4034 help the user drive two debuggers. So for now, I'm disabling
4035 the "both" option. */
4036 /* "Set debugger response to a program call of fork \
4038 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4039 parent - the original process is debugged after a fork\n\
4040 child - the new process is debugged after a fork\n\
4041 both - both the parent and child are debugged after a fork\n\
4042 ask - the debugger will ask for one of the above choices\n\
4043 For \"both\", another copy of the debugger will be started to follow\n\
4044 the new child process. The original debugger will continue to follow\n\
4045 the original parent process. To distinguish their prompts, the\n\
4046 debugger copy's prompt will be changed.\n\
4047 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4048 By default, the debugger will follow the parent process.",
4050 "Set debugger response to a program call of fork \
4052 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4053 parent - the original process is debugged after a fork\n\
4054 child - the new process is debugged after a fork\n\
4055 ask - the debugger will ask for one of the above choices\n\
4056 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4057 By default, the debugger will follow the parent process.", &setlist
);
4058 add_show_from_set (c
, &showlist
);
4060 c
= add_set_enum_cmd ("scheduler-locking", class_run
, scheduler_enums
, /* array of string names */
4061 &scheduler_mode
, /* current mode */
4062 "Set mode for locking scheduler during execution.\n\
4063 off == no locking (threads may preempt at any time)\n\
4064 on == full locking (no thread except the current thread may run)\n\
4065 step == scheduler locked during every single-step operation.\n\
4066 In this mode, no other thread may run during a step command.\n\
4067 Other threads may run while stepping over a function call ('next').", &setlist
);
4069 set_cmd_sfunc (c
, set_schedlock_func
); /* traps on target vector */
4070 add_show_from_set (c
, &showlist
);
4072 c
= add_set_cmd ("step-mode", class_run
,
4073 var_boolean
, (char *) &step_stop_if_no_debug
,
4074 "Set mode of the step operation. When set, doing a step over a\n\
4075 function without debug line information will stop at the first\n\
4076 instruction of that function. Otherwise, the function is skipped and\n\
4077 the step command stops at a different source line.", &setlist
);
4078 add_show_from_set (c
, &showlist
);
4080 /* ptid initializations */
4081 null_ptid
= ptid_build (0, 0, 0);
4082 minus_one_ptid
= ptid_build (-1, 0, 0);
4083 inferior_ptid
= null_ptid
;
4084 target_last_wait_ptid
= minus_one_ptid
;