1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
6 Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
31 #include "breakpoint.h"
35 #include "cli/cli-script.h"
37 #include "gdbthread.h"
47 #include "gdb_assert.h"
49 /* Prototypes for local functions */
51 static void signals_info (char *, int);
53 static void handle_command (char *, int);
55 static void sig_print_info (enum target_signal
);
57 static void sig_print_header (void);
59 static void resume_cleanups (void *);
61 static int hook_stop_stub (void *);
63 static void delete_breakpoint_current_contents (void *);
65 static int restore_selected_frame (void *);
67 static void build_infrun (void);
69 static int follow_fork (void);
71 static void set_schedlock_func (char *args
, int from_tty
,
72 struct cmd_list_element
*c
);
74 struct execution_control_state
;
76 static int currently_stepping (struct execution_control_state
*ecs
);
78 static void xdb_handle_command (char *args
, int from_tty
);
80 static int prepare_to_proceed (void);
82 void _initialize_infrun (void);
84 int inferior_ignoring_startup_exec_events
= 0;
85 int inferior_ignoring_leading_exec_events
= 0;
87 /* When set, stop the 'step' command if we enter a function which has
88 no line number information. The normal behavior is that we step
89 over such function. */
90 int step_stop_if_no_debug
= 0;
92 /* In asynchronous mode, but simulating synchronous execution. */
94 int sync_execution
= 0;
96 /* wait_for_inferior and normal_stop use this to notify the user
97 when the inferior stopped in a different thread than it had been
100 static ptid_t previous_inferior_ptid
;
102 /* This is true for configurations that may follow through execl() and
103 similar functions. At present this is only true for HP-UX native. */
105 #ifndef MAY_FOLLOW_EXEC
106 #define MAY_FOLLOW_EXEC (0)
109 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
111 /* If the program uses ELF-style shared libraries, then calls to
112 functions in shared libraries go through stubs, which live in a
113 table called the PLT (Procedure Linkage Table). The first time the
114 function is called, the stub sends control to the dynamic linker,
115 which looks up the function's real address, patches the stub so
116 that future calls will go directly to the function, and then passes
117 control to the function.
119 If we are stepping at the source level, we don't want to see any of
120 this --- we just want to skip over the stub and the dynamic linker.
121 The simple approach is to single-step until control leaves the
124 However, on some systems (e.g., Red Hat's 5.2 distribution) the
125 dynamic linker calls functions in the shared C library, so you
126 can't tell from the PC alone whether the dynamic linker is still
127 running. In this case, we use a step-resume breakpoint to get us
128 past the dynamic linker, as if we were using "next" to step over a
131 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
132 linker code or not. Normally, this means we single-step. However,
133 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
134 address where we can place a step-resume breakpoint to get past the
135 linker's symbol resolution function.
137 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
138 pretty portable way, by comparing the PC against the address ranges
139 of the dynamic linker's sections.
141 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
142 it depends on internal details of the dynamic linker. It's usually
143 not too hard to figure out where to put a breakpoint, but it
144 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
145 sanity checking. If it can't figure things out, returning zero and
146 getting the (possibly confusing) stepping behavior is better than
147 signalling an error, which will obscure the change in the
150 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
151 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
154 /* This function returns TRUE if pc is the address of an instruction
155 that lies within the dynamic linker (such as the event hook, or the
158 This function must be used only when a dynamic linker event has
159 been caught, and the inferior is being stepped out of the hook, or
160 undefined results are guaranteed. */
162 #ifndef SOLIB_IN_DYNAMIC_LINKER
163 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
166 /* On MIPS16, a function that returns a floating point value may call
167 a library helper function to copy the return value to a floating point
168 register. The IGNORE_HELPER_CALL macro returns non-zero if we
169 should ignore (i.e. step over) this function call. */
170 #ifndef IGNORE_HELPER_CALL
171 #define IGNORE_HELPER_CALL(pc) 0
174 /* On some systems, the PC may be left pointing at an instruction that won't
175 actually be executed. This is usually indicated by a bit in the PSW. If
176 we find ourselves in such a state, then we step the target beyond the
177 nullified instruction before returning control to the user so as to avoid
180 #ifndef INSTRUCTION_NULLIFIED
181 #define INSTRUCTION_NULLIFIED 0
184 /* We can't step off a permanent breakpoint in the ordinary way, because we
185 can't remove it. Instead, we have to advance the PC to the next
186 instruction. This macro should expand to a pointer to a function that
187 does that, or zero if we have no such function. If we don't have a
188 definition for it, we have to report an error. */
189 #ifndef SKIP_PERMANENT_BREAKPOINT
190 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
192 default_skip_permanent_breakpoint (void)
195 The program is stopped at a permanent breakpoint, but GDB does not know\n\
196 how to step past a permanent breakpoint on this architecture. Try using\n\
197 a command like `return' or `jump' to continue execution.");
202 /* Convert the #defines into values. This is temporary until wfi control
203 flow is completely sorted out. */
205 #ifndef HAVE_STEPPABLE_WATCHPOINT
206 #define HAVE_STEPPABLE_WATCHPOINT 0
208 #undef HAVE_STEPPABLE_WATCHPOINT
209 #define HAVE_STEPPABLE_WATCHPOINT 1
212 #ifndef CANNOT_STEP_HW_WATCHPOINTS
213 #define CANNOT_STEP_HW_WATCHPOINTS 0
215 #undef CANNOT_STEP_HW_WATCHPOINTS
216 #define CANNOT_STEP_HW_WATCHPOINTS 1
219 /* Tables of how to react to signals; the user sets them. */
221 static unsigned char *signal_stop
;
222 static unsigned char *signal_print
;
223 static unsigned char *signal_program
;
225 #define SET_SIGS(nsigs,sigs,flags) \
227 int signum = (nsigs); \
228 while (signum-- > 0) \
229 if ((sigs)[signum]) \
230 (flags)[signum] = 1; \
233 #define UNSET_SIGS(nsigs,sigs,flags) \
235 int signum = (nsigs); \
236 while (signum-- > 0) \
237 if ((sigs)[signum]) \
238 (flags)[signum] = 0; \
241 /* Value to pass to target_resume() to cause all threads to resume */
243 #define RESUME_ALL (pid_to_ptid (-1))
245 /* Command list pointer for the "stop" placeholder. */
247 static struct cmd_list_element
*stop_command
;
249 /* Nonzero if breakpoints are now inserted in the inferior. */
251 static int breakpoints_inserted
;
253 /* Function inferior was in as of last step command. */
255 static struct symbol
*step_start_function
;
257 /* Nonzero if we are expecting a trace trap and should proceed from it. */
259 static int trap_expected
;
262 /* Nonzero if we want to give control to the user when we're notified
263 of shared library events by the dynamic linker. */
264 static int stop_on_solib_events
;
268 /* Nonzero if the next time we try to continue the inferior, it will
269 step one instruction and generate a spurious trace trap.
270 This is used to compensate for a bug in HP-UX. */
272 static int trap_expected_after_continue
;
275 /* Nonzero means expecting a trace trap
276 and should stop the inferior and return silently when it happens. */
280 /* Nonzero means expecting a trap and caller will handle it themselves.
281 It is used after attach, due to attaching to a process;
282 when running in the shell before the child program has been exec'd;
283 and when running some kinds of remote stuff (FIXME?). */
285 enum stop_kind stop_soon
;
287 /* Nonzero if proceed is being used for a "finish" command or a similar
288 situation when stop_registers should be saved. */
290 int proceed_to_finish
;
292 /* Save register contents here when about to pop a stack dummy frame,
293 if-and-only-if proceed_to_finish is set.
294 Thus this contains the return value from the called function (assuming
295 values are returned in a register). */
297 struct regcache
*stop_registers
;
299 /* Nonzero if program stopped due to error trying to insert breakpoints. */
301 static int breakpoints_failed
;
303 /* Nonzero after stop if current stack frame should be printed. */
305 static int stop_print_frame
;
307 static struct breakpoint
*step_resume_breakpoint
= NULL
;
308 static struct breakpoint
*through_sigtramp_breakpoint
= NULL
;
310 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
311 interactions with an inferior that is running a kernel function
312 (aka, a system call or "syscall"). wait_for_inferior therefore
313 may have a need to know when the inferior is in a syscall. This
314 is a count of the number of inferior threads which are known to
315 currently be running in a syscall. */
316 static int number_of_threads_in_syscalls
;
318 /* This is a cached copy of the pid/waitstatus of the last event
319 returned by target_wait()/deprecated_target_wait_hook(). This
320 information is returned by get_last_target_status(). */
321 static ptid_t target_last_wait_ptid
;
322 static struct target_waitstatus target_last_waitstatus
;
324 /* This is used to remember when a fork, vfork or exec event
325 was caught by a catchpoint, and thus the event is to be
326 followed at the next resume of the inferior, and not
330 enum target_waitkind kind
;
337 char *execd_pathname
;
341 static const char follow_fork_mode_child
[] = "child";
342 static const char follow_fork_mode_parent
[] = "parent";
344 static const char *follow_fork_mode_kind_names
[] = {
345 follow_fork_mode_child
,
346 follow_fork_mode_parent
,
350 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
356 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
358 return target_follow_fork (follow_child
);
362 follow_inferior_reset_breakpoints (void)
364 /* Was there a step_resume breakpoint? (There was if the user
365 did a "next" at the fork() call.) If so, explicitly reset its
368 step_resumes are a form of bp that are made to be per-thread.
369 Since we created the step_resume bp when the parent process
370 was being debugged, and now are switching to the child process,
371 from the breakpoint package's viewpoint, that's a switch of
372 "threads". We must update the bp's notion of which thread
373 it is for, or it'll be ignored when it triggers. */
375 if (step_resume_breakpoint
)
376 breakpoint_re_set_thread (step_resume_breakpoint
);
378 /* Reinsert all breakpoints in the child. The user may have set
379 breakpoints after catching the fork, in which case those
380 were never set in the child, but only in the parent. This makes
381 sure the inserted breakpoints match the breakpoint list. */
383 breakpoint_re_set ();
384 insert_breakpoints ();
387 /* EXECD_PATHNAME is assumed to be non-NULL. */
390 follow_exec (int pid
, char *execd_pathname
)
393 struct target_ops
*tgt
;
395 if (!may_follow_exec
)
398 /* This is an exec event that we actually wish to pay attention to.
399 Refresh our symbol table to the newly exec'd program, remove any
402 If there are breakpoints, they aren't really inserted now,
403 since the exec() transformed our inferior into a fresh set
406 We want to preserve symbolic breakpoints on the list, since
407 we have hopes that they can be reset after the new a.out's
408 symbol table is read.
410 However, any "raw" breakpoints must be removed from the list
411 (e.g., the solib bp's), since their address is probably invalid
414 And, we DON'T want to call delete_breakpoints() here, since
415 that may write the bp's "shadow contents" (the instruction
416 value that was overwritten witha TRAP instruction). Since
417 we now have a new a.out, those shadow contents aren't valid. */
418 update_breakpoints_after_exec ();
420 /* If there was one, it's gone now. We cannot truly step-to-next
421 statement through an exec(). */
422 step_resume_breakpoint
= NULL
;
423 step_range_start
= 0;
426 /* If there was one, it's gone now. */
427 through_sigtramp_breakpoint
= NULL
;
429 /* What is this a.out's name? */
430 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
432 /* We've followed the inferior through an exec. Therefore, the
433 inferior has essentially been killed & reborn. */
435 /* First collect the run target in effect. */
436 tgt
= find_run_target ();
437 /* If we can't find one, things are in a very strange state... */
439 error ("Could find run target to save before following exec");
441 gdb_flush (gdb_stdout
);
442 target_mourn_inferior ();
443 inferior_ptid
= pid_to_ptid (saved_pid
);
444 /* Because mourn_inferior resets inferior_ptid. */
447 /* That a.out is now the one to use. */
448 exec_file_attach (execd_pathname
, 0);
450 /* And also is where symbols can be found. */
451 symbol_file_add_main (execd_pathname
, 0);
453 /* Reset the shared library package. This ensures that we get
454 a shlib event when the child reaches "_start", at which point
455 the dld will have had a chance to initialize the child. */
456 #if defined(SOLIB_RESTART)
459 #ifdef SOLIB_CREATE_INFERIOR_HOOK
460 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
463 /* Reinsert all breakpoints. (Those which were symbolic have
464 been reset to the proper address in the new a.out, thanks
465 to symbol_file_command...) */
466 insert_breakpoints ();
468 /* The next resume of this inferior should bring it to the shlib
469 startup breakpoints. (If the user had also set bp's on
470 "main" from the old (parent) process, then they'll auto-
471 matically get reset there in the new process.) */
474 /* Non-zero if we just simulating a single-step. This is needed
475 because we cannot remove the breakpoints in the inferior process
476 until after the `wait' in `wait_for_inferior'. */
477 static int singlestep_breakpoints_inserted_p
= 0;
479 /* The thread we inserted single-step breakpoints for. */
480 static ptid_t singlestep_ptid
;
482 /* If another thread hit the singlestep breakpoint, we save the original
483 thread here so that we can resume single-stepping it later. */
484 static ptid_t saved_singlestep_ptid
;
485 static int stepping_past_singlestep_breakpoint
;
488 /* Things to clean up if we QUIT out of resume (). */
490 resume_cleanups (void *ignore
)
495 static const char schedlock_off
[] = "off";
496 static const char schedlock_on
[] = "on";
497 static const char schedlock_step
[] = "step";
498 static const char *scheduler_mode
= schedlock_off
;
499 static const char *scheduler_enums
[] = {
507 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
509 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
510 the set command passed as a parameter. The clone operation will
511 include (BUG?) any ``set'' command callback, if present.
512 Commands like ``info set'' call all the ``show'' command
513 callbacks. Unfortunately, for ``show'' commands cloned from
514 ``set'', this includes callbacks belonging to ``set'' commands.
515 Making this worse, this only occures if add_show_from_set() is
516 called after add_cmd_sfunc() (BUG?). */
517 if (cmd_type (c
) == set_cmd
)
518 if (!target_can_lock_scheduler
)
520 scheduler_mode
= schedlock_off
;
521 error ("Target '%s' cannot support this command.", target_shortname
);
526 /* Resume the inferior, but allow a QUIT. This is useful if the user
527 wants to interrupt some lengthy single-stepping operation
528 (for child processes, the SIGINT goes to the inferior, and so
529 we get a SIGINT random_signal, but for remote debugging and perhaps
530 other targets, that's not true).
532 STEP nonzero if we should step (zero to continue instead).
533 SIG is the signal to give the inferior (zero for none). */
535 resume (int step
, enum target_signal sig
)
537 int should_resume
= 1;
538 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
541 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
544 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
545 over an instruction that causes a page fault without triggering
546 a hardware watchpoint. The kernel properly notices that it shouldn't
547 stop, because the hardware watchpoint is not triggered, but it forgets
548 the step request and continues the program normally.
549 Work around the problem by removing hardware watchpoints if a step is
550 requested, GDB will check for a hardware watchpoint trigger after the
552 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
553 remove_hw_watchpoints ();
556 /* Normally, by the time we reach `resume', the breakpoints are either
557 removed or inserted, as appropriate. The exception is if we're sitting
558 at a permanent breakpoint; we need to step over it, but permanent
559 breakpoints can't be removed. So we have to test for it here. */
560 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
561 SKIP_PERMANENT_BREAKPOINT ();
563 if (SOFTWARE_SINGLE_STEP_P () && step
)
565 /* Do it the hard way, w/temp breakpoints */
566 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
567 /* ...and don't ask hardware to do it. */
569 /* and do not pull these breakpoints until after a `wait' in
570 `wait_for_inferior' */
571 singlestep_breakpoints_inserted_p
= 1;
572 singlestep_ptid
= inferior_ptid
;
575 /* Handle any optimized stores to the inferior NOW... */
576 #ifdef DO_DEFERRED_STORES
580 /* If there were any forks/vforks/execs that were caught and are
581 now to be followed, then do so. */
582 switch (pending_follow
.kind
)
584 case TARGET_WAITKIND_FORKED
:
585 case TARGET_WAITKIND_VFORKED
:
586 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
591 case TARGET_WAITKIND_EXECD
:
592 /* follow_exec is called as soon as the exec event is seen. */
593 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
600 /* Install inferior's terminal modes. */
601 target_terminal_inferior ();
607 resume_ptid
= RESUME_ALL
; /* Default */
609 if ((step
|| singlestep_breakpoints_inserted_p
) &&
610 (stepping_past_singlestep_breakpoint
611 || (!breakpoints_inserted
&& breakpoint_here_p (read_pc ()))))
613 /* Stepping past a breakpoint without inserting breakpoints.
614 Make sure only the current thread gets to step, so that
615 other threads don't sneak past breakpoints while they are
618 resume_ptid
= inferior_ptid
;
621 if ((scheduler_mode
== schedlock_on
) ||
622 (scheduler_mode
== schedlock_step
&&
623 (step
|| singlestep_breakpoints_inserted_p
)))
625 /* User-settable 'scheduler' mode requires solo thread resume. */
626 resume_ptid
= inferior_ptid
;
629 if (CANNOT_STEP_BREAKPOINT
)
631 /* Most targets can step a breakpoint instruction, thus
632 executing it normally. But if this one cannot, just
633 continue and we will hit it anyway. */
634 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
637 target_resume (resume_ptid
, step
, sig
);
640 discard_cleanups (old_cleanups
);
644 /* Clear out all variables saying what to do when inferior is continued.
645 First do this, then set the ones you want, then call `proceed'. */
648 clear_proceed_status (void)
651 step_range_start
= 0;
653 step_frame_id
= null_frame_id
;
654 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
656 stop_soon
= NO_STOP_QUIETLY
;
657 proceed_to_finish
= 0;
658 breakpoint_proceeded
= 1; /* We're about to proceed... */
660 /* Discard any remaining commands or status from previous stop. */
661 bpstat_clear (&stop_bpstat
);
664 /* This should be suitable for any targets that support threads. */
667 prepare_to_proceed (void)
670 struct target_waitstatus wait_status
;
672 /* Get the last target status returned by target_wait(). */
673 get_last_target_status (&wait_ptid
, &wait_status
);
675 /* Make sure we were stopped either at a breakpoint, or because
677 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
678 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
&&
679 wait_status
.value
.sig
!= TARGET_SIGNAL_INT
))
684 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
685 && !ptid_equal (inferior_ptid
, wait_ptid
))
687 /* Switched over from WAIT_PID. */
688 CORE_ADDR wait_pc
= read_pc_pid (wait_ptid
);
690 if (wait_pc
!= read_pc ())
692 /* Switch back to WAIT_PID thread. */
693 inferior_ptid
= wait_ptid
;
695 /* FIXME: This stuff came from switch_to_thread() in
696 thread.c (which should probably be a public function). */
697 flush_cached_frames ();
698 registers_changed ();
700 select_frame (get_current_frame ());
703 /* We return 1 to indicate that there is a breakpoint here,
704 so we need to step over it before continuing to avoid
705 hitting it straight away. */
706 if (breakpoint_here_p (wait_pc
))
714 /* Record the pc of the program the last time it stopped. This is
715 just used internally by wait_for_inferior, but need to be preserved
716 over calls to it and cleared when the inferior is started. */
717 static CORE_ADDR prev_pc
;
719 /* Basic routine for continuing the program in various fashions.
721 ADDR is the address to resume at, or -1 for resume where stopped.
722 SIGGNAL is the signal to give it, or 0 for none,
723 or -1 for act according to how it stopped.
724 STEP is nonzero if should trap after one instruction.
725 -1 means return after that and print nothing.
726 You should probably set various step_... variables
727 before calling here, if you are stepping.
729 You should call clear_proceed_status before calling proceed. */
732 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
737 step_start_function
= find_pc_function (read_pc ());
741 if (addr
== (CORE_ADDR
) -1)
743 /* If there is a breakpoint at the address we will resume at,
744 step one instruction before inserting breakpoints
745 so that we do not stop right away (and report a second
746 hit at this breakpoint). */
748 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
751 #ifndef STEP_SKIPS_DELAY
752 #define STEP_SKIPS_DELAY(pc) (0)
753 #define STEP_SKIPS_DELAY_P (0)
755 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
756 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
757 is slow (it needs to read memory from the target). */
758 if (STEP_SKIPS_DELAY_P
759 && breakpoint_here_p (read_pc () + 4)
760 && STEP_SKIPS_DELAY (read_pc ()))
768 /* In a multi-threaded task we may select another thread
769 and then continue or step.
771 But if the old thread was stopped at a breakpoint, it
772 will immediately cause another breakpoint stop without
773 any execution (i.e. it will report a breakpoint hit
774 incorrectly). So we must step over it first.
776 prepare_to_proceed checks the current thread against the thread
777 that reported the most recent event. If a step-over is required
778 it returns TRUE and sets the current thread to the old thread. */
779 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
783 if (trap_expected_after_continue
)
785 /* If (step == 0), a trap will be automatically generated after
786 the first instruction is executed. Force step one
787 instruction to clear this condition. This should not occur
788 if step is nonzero, but it is harmless in that case. */
790 trap_expected_after_continue
= 0;
792 #endif /* HP_OS_BUG */
795 /* We will get a trace trap after one instruction.
796 Continue it automatically and insert breakpoints then. */
800 insert_breakpoints ();
801 /* If we get here there was no call to error() in
802 insert breakpoints -- so they were inserted. */
803 breakpoints_inserted
= 1;
806 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
807 stop_signal
= siggnal
;
808 /* If this signal should not be seen by program,
809 give it zero. Used for debugging signals. */
810 else if (!signal_program
[stop_signal
])
811 stop_signal
= TARGET_SIGNAL_0
;
813 annotate_starting ();
815 /* Make sure that output from GDB appears before output from the
817 gdb_flush (gdb_stdout
);
819 /* Refresh prev_pc value just prior to resuming. This used to be
820 done in stop_stepping, however, setting prev_pc there did not handle
821 scenarios such as inferior function calls or returning from
822 a function via the return command. In those cases, the prev_pc
823 value was not set properly for subsequent commands. The prev_pc value
824 is used to initialize the starting line number in the ecs. With an
825 invalid value, the gdb next command ends up stopping at the position
826 represented by the next line table entry past our start position.
827 On platforms that generate one line table entry per line, this
828 is not a problem. However, on the ia64, the compiler generates
829 extraneous line table entries that do not increase the line number.
830 When we issue the gdb next command on the ia64 after an inferior call
831 or a return command, we often end up a few instructions forward, still
832 within the original line we started.
834 An attempt was made to have init_execution_control_state () refresh
835 the prev_pc value before calculating the line number. This approach
836 did not work because on platforms that use ptrace, the pc register
837 cannot be read unless the inferior is stopped. At that point, we
838 are not guaranteed the inferior is stopped and so the read_pc ()
839 call can fail. Setting the prev_pc value here ensures the value is
840 updated correctly when the inferior is stopped. */
841 prev_pc
= read_pc ();
843 /* Resume inferior. */
844 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
846 /* Wait for it to stop (if not standalone)
847 and in any case decode why it stopped, and act accordingly. */
848 /* Do this only if we are not using the event loop, or if the target
849 does not support asynchronous execution. */
850 if (!event_loop_p
|| !target_can_async_p ())
852 wait_for_inferior ();
858 /* Start remote-debugging of a machine over a serial link. */
864 init_wait_for_inferior ();
865 stop_soon
= STOP_QUIETLY
;
868 /* Always go on waiting for the target, regardless of the mode. */
869 /* FIXME: cagney/1999-09-23: At present it isn't possible to
870 indicate to wait_for_inferior that a target should timeout if
871 nothing is returned (instead of just blocking). Because of this,
872 targets expecting an immediate response need to, internally, set
873 things up so that the target_wait() is forced to eventually
875 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
876 differentiate to its caller what the state of the target is after
877 the initial open has been performed. Here we're assuming that
878 the target has stopped. It should be possible to eventually have
879 target_open() return to the caller an indication that the target
880 is currently running and GDB state should be set to the same as
882 wait_for_inferior ();
886 /* Initialize static vars when a new inferior begins. */
889 init_wait_for_inferior (void)
891 /* These are meaningless until the first time through wait_for_inferior. */
895 trap_expected_after_continue
= 0;
897 breakpoints_inserted
= 0;
898 breakpoint_init_inferior (inf_starting
);
900 /* Don't confuse first call to proceed(). */
901 stop_signal
= TARGET_SIGNAL_0
;
903 /* The first resume is not following a fork/vfork/exec. */
904 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
906 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
907 number_of_threads_in_syscalls
= 0;
909 clear_proceed_status ();
911 stepping_past_singlestep_breakpoint
= 0;
915 delete_breakpoint_current_contents (void *arg
)
917 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
918 if (*breakpointp
!= NULL
)
920 delete_breakpoint (*breakpointp
);
925 /* This enum encodes possible reasons for doing a target_wait, so that
926 wfi can call target_wait in one place. (Ultimately the call will be
927 moved out of the infinite loop entirely.) */
931 infwait_normal_state
,
932 infwait_thread_hop_state
,
933 infwait_nullified_state
,
934 infwait_nonstep_watch_state
937 /* Why did the inferior stop? Used to print the appropriate messages
938 to the interface from within handle_inferior_event(). */
939 enum inferior_stop_reason
941 /* We don't know why. */
943 /* Step, next, nexti, stepi finished. */
945 /* Found breakpoint. */
947 /* Inferior terminated by signal. */
949 /* Inferior exited. */
951 /* Inferior received signal, and user asked to be notified. */
955 /* This structure contains what used to be local variables in
956 wait_for_inferior. Probably many of them can return to being
957 locals in handle_inferior_event. */
959 struct execution_control_state
961 struct target_waitstatus ws
;
962 struct target_waitstatus
*wp
;
965 CORE_ADDR stop_func_start
;
966 CORE_ADDR stop_func_end
;
967 char *stop_func_name
;
968 struct symtab_and_line sal
;
969 int remove_breakpoints_on_following_step
;
971 struct symtab
*current_symtab
;
972 int handling_longjmp
; /* FIXME */
974 ptid_t saved_inferior_ptid
;
976 int stepping_through_solib_after_catch
;
977 bpstat stepping_through_solib_catchpoints
;
978 int enable_hw_watchpoints_after_wait
;
979 int stepping_through_sigtramp
;
980 int new_thread_event
;
981 struct target_waitstatus tmpstatus
;
982 enum infwait_states infwait_state
;
987 void init_execution_control_state (struct execution_control_state
*ecs
);
989 static void handle_step_into_function (struct execution_control_state
*ecs
);
990 void handle_inferior_event (struct execution_control_state
*ecs
);
992 static void check_sigtramp2 (struct execution_control_state
*ecs
);
993 static void step_into_function (struct execution_control_state
*ecs
);
994 static void step_over_function (struct execution_control_state
*ecs
);
995 static void stop_stepping (struct execution_control_state
*ecs
);
996 static void prepare_to_wait (struct execution_control_state
*ecs
);
997 static void keep_going (struct execution_control_state
*ecs
);
998 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1001 /* Wait for control to return from inferior to debugger.
1002 If inferior gets a signal, we may decide to start it up again
1003 instead of returning. That is why there is a loop in this function.
1004 When this function actually returns it means the inferior
1005 should be left stopped and GDB should read more commands. */
1008 wait_for_inferior (void)
1010 struct cleanup
*old_cleanups
;
1011 struct execution_control_state ecss
;
1012 struct execution_control_state
*ecs
;
1014 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
1015 &step_resume_breakpoint
);
1016 make_cleanup (delete_breakpoint_current_contents
,
1017 &through_sigtramp_breakpoint
);
1019 /* wfi still stays in a loop, so it's OK just to take the address of
1020 a local to get the ecs pointer. */
1023 /* Fill in with reasonable starting values. */
1024 init_execution_control_state (ecs
);
1026 /* We'll update this if & when we switch to a new thread. */
1027 previous_inferior_ptid
= inferior_ptid
;
1029 overlay_cache_invalid
= 1;
1031 /* We have to invalidate the registers BEFORE calling target_wait
1032 because they can be loaded from the target while in target_wait.
1033 This makes remote debugging a bit more efficient for those
1034 targets that provide critical registers as part of their normal
1035 status mechanism. */
1037 registers_changed ();
1041 if (deprecated_target_wait_hook
)
1042 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1044 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1046 /* Now figure out what to do with the result of the result. */
1047 handle_inferior_event (ecs
);
1049 if (!ecs
->wait_some_more
)
1052 do_cleanups (old_cleanups
);
1055 /* Asynchronous version of wait_for_inferior. It is called by the
1056 event loop whenever a change of state is detected on the file
1057 descriptor corresponding to the target. It can be called more than
1058 once to complete a single execution command. In such cases we need
1059 to keep the state in a global variable ASYNC_ECSS. If it is the
1060 last time that this function is called for a single execution
1061 command, then report to the user that the inferior has stopped, and
1062 do the necessary cleanups. */
1064 struct execution_control_state async_ecss
;
1065 struct execution_control_state
*async_ecs
;
1068 fetch_inferior_event (void *client_data
)
1070 static struct cleanup
*old_cleanups
;
1072 async_ecs
= &async_ecss
;
1074 if (!async_ecs
->wait_some_more
)
1076 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1077 &step_resume_breakpoint
);
1078 make_exec_cleanup (delete_breakpoint_current_contents
,
1079 &through_sigtramp_breakpoint
);
1081 /* Fill in with reasonable starting values. */
1082 init_execution_control_state (async_ecs
);
1084 /* We'll update this if & when we switch to a new thread. */
1085 previous_inferior_ptid
= inferior_ptid
;
1087 overlay_cache_invalid
= 1;
1089 /* We have to invalidate the registers BEFORE calling target_wait
1090 because they can be loaded from the target while in target_wait.
1091 This makes remote debugging a bit more efficient for those
1092 targets that provide critical registers as part of their normal
1093 status mechanism. */
1095 registers_changed ();
1098 if (deprecated_target_wait_hook
)
1100 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1102 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1104 /* Now figure out what to do with the result of the result. */
1105 handle_inferior_event (async_ecs
);
1107 if (!async_ecs
->wait_some_more
)
1109 /* Do only the cleanups that have been added by this
1110 function. Let the continuations for the commands do the rest,
1111 if there are any. */
1112 do_exec_cleanups (old_cleanups
);
1114 if (step_multi
&& stop_step
)
1115 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1117 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1121 /* Prepare an execution control state for looping through a
1122 wait_for_inferior-type loop. */
1125 init_execution_control_state (struct execution_control_state
*ecs
)
1127 /* ecs->another_trap? */
1128 ecs
->random_signal
= 0;
1129 ecs
->remove_breakpoints_on_following_step
= 0;
1130 ecs
->handling_longjmp
= 0; /* FIXME */
1131 ecs
->update_step_sp
= 0;
1132 ecs
->stepping_through_solib_after_catch
= 0;
1133 ecs
->stepping_through_solib_catchpoints
= NULL
;
1134 ecs
->enable_hw_watchpoints_after_wait
= 0;
1135 ecs
->stepping_through_sigtramp
= 0;
1136 ecs
->sal
= find_pc_line (prev_pc
, 0);
1137 ecs
->current_line
= ecs
->sal
.line
;
1138 ecs
->current_symtab
= ecs
->sal
.symtab
;
1139 ecs
->infwait_state
= infwait_normal_state
;
1140 ecs
->waiton_ptid
= pid_to_ptid (-1);
1141 ecs
->wp
= &(ecs
->ws
);
1144 /* Call this function before setting step_resume_breakpoint, as a
1145 sanity check. There should never be more than one step-resume
1146 breakpoint per thread, so we should never be setting a new
1147 step_resume_breakpoint when one is already active. */
1149 check_for_old_step_resume_breakpoint (void)
1151 if (step_resume_breakpoint
)
1153 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1156 /* Return the cached copy of the last pid/waitstatus returned by
1157 target_wait()/deprecated_target_wait_hook(). The data is actually
1158 cached by handle_inferior_event(), which gets called immediately
1159 after target_wait()/deprecated_target_wait_hook(). */
1162 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1164 *ptidp
= target_last_wait_ptid
;
1165 *status
= target_last_waitstatus
;
1168 /* Switch thread contexts, maintaining "infrun state". */
1171 context_switch (struct execution_control_state
*ecs
)
1173 /* Caution: it may happen that the new thread (or the old one!)
1174 is not in the thread list. In this case we must not attempt
1175 to "switch context", or we run the risk that our context may
1176 be lost. This may happen as a result of the target module
1177 mishandling thread creation. */
1179 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1180 { /* Perform infrun state context switch: */
1181 /* Save infrun state for the old thread. */
1182 save_infrun_state (inferior_ptid
, prev_pc
,
1183 trap_expected
, step_resume_breakpoint
,
1184 through_sigtramp_breakpoint
, step_range_start
,
1185 step_range_end
, &step_frame_id
,
1186 ecs
->handling_longjmp
, ecs
->another_trap
,
1187 ecs
->stepping_through_solib_after_catch
,
1188 ecs
->stepping_through_solib_catchpoints
,
1189 ecs
->stepping_through_sigtramp
,
1190 ecs
->current_line
, ecs
->current_symtab
, step_sp
);
1192 /* Load infrun state for the new thread. */
1193 load_infrun_state (ecs
->ptid
, &prev_pc
,
1194 &trap_expected
, &step_resume_breakpoint
,
1195 &through_sigtramp_breakpoint
, &step_range_start
,
1196 &step_range_end
, &step_frame_id
,
1197 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1198 &ecs
->stepping_through_solib_after_catch
,
1199 &ecs
->stepping_through_solib_catchpoints
,
1200 &ecs
->stepping_through_sigtramp
,
1201 &ecs
->current_line
, &ecs
->current_symtab
, &step_sp
);
1203 inferior_ptid
= ecs
->ptid
;
1206 /* Handle the inferior event in the cases when we just stepped
1210 handle_step_into_function (struct execution_control_state
*ecs
)
1212 CORE_ADDR real_stop_pc
;
1214 if ((step_over_calls
== STEP_OVER_NONE
)
1215 || ((step_range_end
== 1)
1216 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
1218 /* I presume that step_over_calls is only 0 when we're
1219 supposed to be stepping at the assembly language level
1220 ("stepi"). Just stop. */
1221 /* Also, maybe we just did a "nexti" inside a prolog,
1222 so we thought it was a subroutine call but it was not.
1223 Stop as well. FENN */
1225 print_stop_reason (END_STEPPING_RANGE
, 0);
1226 stop_stepping (ecs
);
1230 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
1232 /* We're doing a "next". */
1233 step_over_function (ecs
);
1238 /* If we are in a function call trampoline (a stub between
1239 the calling routine and the real function), locate the real
1240 function. That's what tells us (a) whether we want to step
1241 into it at all, and (b) what prologue we want to run to
1242 the end of, if we do step into it. */
1243 real_stop_pc
= skip_language_trampoline (stop_pc
);
1244 if (real_stop_pc
== 0)
1245 real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
1246 if (real_stop_pc
!= 0)
1247 ecs
->stop_func_start
= real_stop_pc
;
1249 /* If we have line number information for the function we
1250 are thinking of stepping into, step into it.
1252 If there are several symtabs at that PC (e.g. with include
1253 files), just want to know whether *any* of them have line
1254 numbers. find_pc_line handles this. */
1256 struct symtab_and_line tmp_sal
;
1258 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
1259 if (tmp_sal
.line
!= 0)
1261 step_into_function (ecs
);
1266 /* If we have no line number and the step-stop-if-no-debug
1267 is set, we stop the step so that the user has a chance to
1268 switch in assembly mode. */
1269 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
1272 print_stop_reason (END_STEPPING_RANGE
, 0);
1273 stop_stepping (ecs
);
1277 step_over_function (ecs
);
1283 adjust_pc_after_break (struct execution_control_state
*ecs
)
1287 /* If this target does not decrement the PC after breakpoints, then
1288 we have nothing to do. */
1289 if (DECR_PC_AFTER_BREAK
== 0)
1292 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1293 we aren't, just return.
1295 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1296 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1297 by software breakpoints should be handled through the normal breakpoint
1300 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1301 different signals (SIGILL or SIGEMT for instance), but it is less
1302 clear where the PC is pointing afterwards. It may not match
1303 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1304 these signals at breakpoints (the code has been in GDB since at least
1305 1992) so I can not guess how to handle them here.
1307 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1308 would have the PC after hitting a watchpoint affected by
1309 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1310 in GDB history, and it seems unlikely to be correct, so
1311 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1313 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1316 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1319 /* Find the location where (if we've hit a breakpoint) the breakpoint would
1321 stop_pc
= read_pc_pid (ecs
->ptid
) - DECR_PC_AFTER_BREAK
;
1323 /* If we're software-single-stepping, then assume this is a breakpoint.
1324 NOTE drow/2004-01-17: This doesn't check that the PC matches, or that
1325 we're even in the right thread. The software-single-step code needs
1328 If we're not software-single-stepping, then we first check that there
1329 is an enabled software breakpoint at this address. If there is, and
1330 we weren't using hardware-single-step, then we've hit the breakpoint.
1332 If we were using hardware-single-step, we check prev_pc; if we just
1333 stepped over an inserted software breakpoint, then we should decrement
1334 the PC and eventually report hitting the breakpoint. The prev_pc check
1335 prevents us from decrementing the PC if we just stepped over a jump
1336 instruction and landed on the instruction after a breakpoint.
1338 The last bit checks that we didn't hit a breakpoint in a signal handler
1339 without an intervening stop in sigtramp, which is detected by a new
1340 stack pointer value below any usual function calling stack adjustments.
1342 NOTE drow/2004-01-17: I'm not sure that this is necessary. The check
1343 predates checking for software single step at the same time. Also,
1344 if we've moved into a signal handler we should have seen the
1347 if ((SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1348 || (software_breakpoint_inserted_here_p (stop_pc
)
1349 && !(currently_stepping (ecs
)
1350 && prev_pc
!= stop_pc
1351 && !(step_range_end
&& INNER_THAN (read_sp (), (step_sp
- 16))))))
1352 write_pc_pid (stop_pc
, ecs
->ptid
);
1355 /* Given an execution control state that has been freshly filled in
1356 by an event from the inferior, figure out what it means and take
1357 appropriate action. */
1359 int stepped_after_stopped_by_watchpoint
;
1362 handle_inferior_event (struct execution_control_state
*ecs
)
1364 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1365 thinking that the variable stepped_after_stopped_by_watchpoint
1366 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1367 defined in the file "config/pa/nm-hppah.h", accesses the variable
1368 indirectly. Mutter something rude about the HP merge. */
1369 int sw_single_step_trap_p
= 0;
1371 /* Cache the last pid/waitstatus. */
1372 target_last_wait_ptid
= ecs
->ptid
;
1373 target_last_waitstatus
= *ecs
->wp
;
1375 adjust_pc_after_break (ecs
);
1377 switch (ecs
->infwait_state
)
1379 case infwait_thread_hop_state
:
1380 /* Cancel the waiton_ptid. */
1381 ecs
->waiton_ptid
= pid_to_ptid (-1);
1382 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1383 is serviced in this loop, below. */
1384 if (ecs
->enable_hw_watchpoints_after_wait
)
1386 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1387 ecs
->enable_hw_watchpoints_after_wait
= 0;
1389 stepped_after_stopped_by_watchpoint
= 0;
1392 case infwait_normal_state
:
1393 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1394 is serviced in this loop, below. */
1395 if (ecs
->enable_hw_watchpoints_after_wait
)
1397 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1398 ecs
->enable_hw_watchpoints_after_wait
= 0;
1400 stepped_after_stopped_by_watchpoint
= 0;
1403 case infwait_nullified_state
:
1404 stepped_after_stopped_by_watchpoint
= 0;
1407 case infwait_nonstep_watch_state
:
1408 insert_breakpoints ();
1410 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1411 handle things like signals arriving and other things happening
1412 in combination correctly? */
1413 stepped_after_stopped_by_watchpoint
= 1;
1417 internal_error (__FILE__
, __LINE__
, "bad switch");
1419 ecs
->infwait_state
= infwait_normal_state
;
1421 flush_cached_frames ();
1423 /* If it's a new process, add it to the thread database */
1425 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1426 && !in_thread_list (ecs
->ptid
));
1428 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1429 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1431 add_thread (ecs
->ptid
);
1433 ui_out_text (uiout
, "[New ");
1434 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1435 ui_out_text (uiout
, "]\n");
1438 /* NOTE: This block is ONLY meant to be invoked in case of a
1439 "thread creation event"! If it is invoked for any other
1440 sort of event (such as a new thread landing on a breakpoint),
1441 the event will be discarded, which is almost certainly
1444 To avoid this, the low-level module (eg. target_wait)
1445 should call in_thread_list and add_thread, so that the
1446 new thread is known by the time we get here. */
1448 /* We may want to consider not doing a resume here in order
1449 to give the user a chance to play with the new thread.
1450 It might be good to make that a user-settable option. */
1452 /* At this point, all threads are stopped (happens
1453 automatically in either the OS or the native code).
1454 Therefore we need to continue all threads in order to
1457 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1458 prepare_to_wait (ecs
);
1463 switch (ecs
->ws
.kind
)
1465 case TARGET_WAITKIND_LOADED
:
1466 /* Ignore gracefully during startup of the inferior, as it
1467 might be the shell which has just loaded some objects,
1468 otherwise add the symbols for the newly loaded objects. */
1470 if (stop_soon
== NO_STOP_QUIETLY
)
1472 /* Remove breakpoints, SOLIB_ADD might adjust
1473 breakpoint addresses via breakpoint_re_set. */
1474 if (breakpoints_inserted
)
1475 remove_breakpoints ();
1477 /* Check for any newly added shared libraries if we're
1478 supposed to be adding them automatically. Switch
1479 terminal for any messages produced by
1480 breakpoint_re_set. */
1481 target_terminal_ours_for_output ();
1482 /* NOTE: cagney/2003-11-25: Make certain that the target
1483 stack's section table is kept up-to-date. Architectures,
1484 (e.g., PPC64), use the section table to perform
1485 operations such as address => section name and hence
1486 require the table to contain all sections (including
1487 those found in shared libraries). */
1488 /* NOTE: cagney/2003-11-25: Pass current_target and not
1489 exec_ops to SOLIB_ADD. This is because current GDB is
1490 only tooled to propagate section_table changes out from
1491 the "current_target" (see target_resize_to_sections), and
1492 not up from the exec stratum. This, of course, isn't
1493 right. "infrun.c" should only interact with the
1494 exec/process stratum, instead relying on the target stack
1495 to propagate relevant changes (stop, section table
1496 changed, ...) up to other layers. */
1497 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1498 target_terminal_inferior ();
1500 /* Reinsert breakpoints and continue. */
1501 if (breakpoints_inserted
)
1502 insert_breakpoints ();
1505 resume (0, TARGET_SIGNAL_0
);
1506 prepare_to_wait (ecs
);
1509 case TARGET_WAITKIND_SPURIOUS
:
1510 resume (0, TARGET_SIGNAL_0
);
1511 prepare_to_wait (ecs
);
1514 case TARGET_WAITKIND_EXITED
:
1515 target_terminal_ours (); /* Must do this before mourn anyway */
1516 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1518 /* Record the exit code in the convenience variable $_exitcode, so
1519 that the user can inspect this again later. */
1520 set_internalvar (lookup_internalvar ("_exitcode"),
1521 value_from_longest (builtin_type_int
,
1522 (LONGEST
) ecs
->ws
.value
.integer
));
1523 gdb_flush (gdb_stdout
);
1524 target_mourn_inferior ();
1525 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1526 stop_print_frame
= 0;
1527 stop_stepping (ecs
);
1530 case TARGET_WAITKIND_SIGNALLED
:
1531 stop_print_frame
= 0;
1532 stop_signal
= ecs
->ws
.value
.sig
;
1533 target_terminal_ours (); /* Must do this before mourn anyway */
1535 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1536 reach here unless the inferior is dead. However, for years
1537 target_kill() was called here, which hints that fatal signals aren't
1538 really fatal on some systems. If that's true, then some changes
1540 target_mourn_inferior ();
1542 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1543 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1544 stop_stepping (ecs
);
1547 /* The following are the only cases in which we keep going;
1548 the above cases end in a continue or goto. */
1549 case TARGET_WAITKIND_FORKED
:
1550 case TARGET_WAITKIND_VFORKED
:
1551 stop_signal
= TARGET_SIGNAL_TRAP
;
1552 pending_follow
.kind
= ecs
->ws
.kind
;
1554 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1555 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1557 stop_pc
= read_pc ();
1559 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1561 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1563 /* If no catchpoint triggered for this, then keep going. */
1564 if (ecs
->random_signal
)
1566 stop_signal
= TARGET_SIGNAL_0
;
1570 goto process_event_stop_test
;
1572 case TARGET_WAITKIND_EXECD
:
1573 stop_signal
= TARGET_SIGNAL_TRAP
;
1575 /* NOTE drow/2002-12-05: This code should be pushed down into the
1576 target_wait function. Until then following vfork on HP/UX 10.20
1577 is probably broken by this. Of course, it's broken anyway. */
1578 /* Is this a target which reports multiple exec events per actual
1579 call to exec()? (HP-UX using ptrace does, for example.) If so,
1580 ignore all but the last one. Just resume the exec'r, and wait
1581 for the next exec event. */
1582 if (inferior_ignoring_leading_exec_events
)
1584 inferior_ignoring_leading_exec_events
--;
1585 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1586 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.
1588 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1589 prepare_to_wait (ecs
);
1592 inferior_ignoring_leading_exec_events
=
1593 target_reported_exec_events_per_exec_call () - 1;
1595 pending_follow
.execd_pathname
=
1596 savestring (ecs
->ws
.value
.execd_pathname
,
1597 strlen (ecs
->ws
.value
.execd_pathname
));
1599 /* This causes the eventpoints and symbol table to be reset. Must
1600 do this now, before trying to determine whether to stop. */
1601 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1602 xfree (pending_follow
.execd_pathname
);
1604 stop_pc
= read_pc_pid (ecs
->ptid
);
1605 ecs
->saved_inferior_ptid
= inferior_ptid
;
1606 inferior_ptid
= ecs
->ptid
;
1608 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1610 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1611 inferior_ptid
= ecs
->saved_inferior_ptid
;
1613 /* If no catchpoint triggered for this, then keep going. */
1614 if (ecs
->random_signal
)
1616 stop_signal
= TARGET_SIGNAL_0
;
1620 goto process_event_stop_test
;
1622 /* These syscall events are returned on HP-UX, as part of its
1623 implementation of page-protection-based "hardware" watchpoints.
1624 HP-UX has unfortunate interactions between page-protections and
1625 some system calls. Our solution is to disable hardware watches
1626 when a system call is entered, and reenable them when the syscall
1627 completes. The downside of this is that we may miss the precise
1628 point at which a watched piece of memory is modified. "Oh well."
1630 Note that we may have multiple threads running, which may each
1631 enter syscalls at roughly the same time. Since we don't have a
1632 good notion currently of whether a watched piece of memory is
1633 thread-private, we'd best not have any page-protections active
1634 when any thread is in a syscall. Thus, we only want to reenable
1635 hardware watches when no threads are in a syscall.
1637 Also, be careful not to try to gather much state about a thread
1638 that's in a syscall. It's frequently a losing proposition. */
1639 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1640 number_of_threads_in_syscalls
++;
1641 if (number_of_threads_in_syscalls
== 1)
1643 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1645 resume (0, TARGET_SIGNAL_0
);
1646 prepare_to_wait (ecs
);
1649 /* Before examining the threads further, step this thread to
1650 get it entirely out of the syscall. (We get notice of the
1651 event when the thread is just on the verge of exiting a
1652 syscall. Stepping one instruction seems to get it back
1655 Note that although the logical place to reenable h/w watches
1656 is here, we cannot. We cannot reenable them before stepping
1657 the thread (this causes the next wait on the thread to hang).
1659 Nor can we enable them after stepping until we've done a wait.
1660 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1661 here, which will be serviced immediately after the target
1663 case TARGET_WAITKIND_SYSCALL_RETURN
:
1664 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1666 if (number_of_threads_in_syscalls
> 0)
1668 number_of_threads_in_syscalls
--;
1669 ecs
->enable_hw_watchpoints_after_wait
=
1670 (number_of_threads_in_syscalls
== 0);
1672 prepare_to_wait (ecs
);
1675 case TARGET_WAITKIND_STOPPED
:
1676 stop_signal
= ecs
->ws
.value
.sig
;
1679 /* We had an event in the inferior, but we are not interested
1680 in handling it at this level. The lower layers have already
1681 done what needs to be done, if anything.
1683 One of the possible circumstances for this is when the
1684 inferior produces output for the console. The inferior has
1685 not stopped, and we are ignoring the event. Another possible
1686 circumstance is any event which the lower level knows will be
1687 reported multiple times without an intervening resume. */
1688 case TARGET_WAITKIND_IGNORE
:
1689 prepare_to_wait (ecs
);
1693 /* We may want to consider not doing a resume here in order to give
1694 the user a chance to play with the new thread. It might be good
1695 to make that a user-settable option. */
1697 /* At this point, all threads are stopped (happens automatically in
1698 either the OS or the native code). Therefore we need to continue
1699 all threads in order to make progress. */
1700 if (ecs
->new_thread_event
)
1702 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1703 prepare_to_wait (ecs
);
1707 stop_pc
= read_pc_pid (ecs
->ptid
);
1709 if (stepping_past_singlestep_breakpoint
)
1711 gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
);
1712 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
1713 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
1715 stepping_past_singlestep_breakpoint
= 0;
1717 /* We've either finished single-stepping past the single-step
1718 breakpoint, or stopped for some other reason. It would be nice if
1719 we could tell, but we can't reliably. */
1720 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1722 /* Pull the single step breakpoints out of the target. */
1723 SOFTWARE_SINGLE_STEP (0, 0);
1724 singlestep_breakpoints_inserted_p
= 0;
1726 ecs
->random_signal
= 0;
1728 ecs
->ptid
= saved_singlestep_ptid
;
1729 context_switch (ecs
);
1730 if (deprecated_context_hook
)
1731 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1733 resume (1, TARGET_SIGNAL_0
);
1734 prepare_to_wait (ecs
);
1739 stepping_past_singlestep_breakpoint
= 0;
1741 /* See if a thread hit a thread-specific breakpoint that was meant for
1742 another thread. If so, then step that thread past the breakpoint,
1745 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1747 int thread_hop_needed
= 0;
1749 /* Check if a regular breakpoint has been hit before checking
1750 for a potential single step breakpoint. Otherwise, GDB will
1751 not see this breakpoint hit when stepping onto breakpoints. */
1752 if (breakpoints_inserted
&& breakpoint_here_p (stop_pc
))
1754 ecs
->random_signal
= 0;
1755 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
1756 thread_hop_needed
= 1;
1758 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1760 ecs
->random_signal
= 0;
1761 /* The call to in_thread_list is necessary because PTIDs sometimes
1762 change when we go from single-threaded to multi-threaded. If
1763 the singlestep_ptid is still in the list, assume that it is
1764 really different from ecs->ptid. */
1765 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
1766 && in_thread_list (singlestep_ptid
))
1768 thread_hop_needed
= 1;
1769 stepping_past_singlestep_breakpoint
= 1;
1770 saved_singlestep_ptid
= singlestep_ptid
;
1774 if (thread_hop_needed
)
1778 /* Saw a breakpoint, but it was hit by the wrong thread.
1781 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1783 /* Pull the single step breakpoints out of the target. */
1784 SOFTWARE_SINGLE_STEP (0, 0);
1785 singlestep_breakpoints_inserted_p
= 0;
1788 remove_status
= remove_breakpoints ();
1789 /* Did we fail to remove breakpoints? If so, try
1790 to set the PC past the bp. (There's at least
1791 one situation in which we can fail to remove
1792 the bp's: On HP-UX's that use ttrace, we can't
1793 change the address space of a vforking child
1794 process until the child exits (well, okay, not
1795 then either :-) or execs. */
1796 if (remove_status
!= 0)
1798 /* FIXME! This is obviously non-portable! */
1799 write_pc_pid (stop_pc
+ 4, ecs
->ptid
);
1800 /* We need to restart all the threads now,
1801 * unles we're running in scheduler-locked mode.
1802 * Use currently_stepping to determine whether to
1805 /* FIXME MVS: is there any reason not to call resume()? */
1806 if (scheduler_mode
== schedlock_on
)
1807 target_resume (ecs
->ptid
,
1808 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1810 target_resume (RESUME_ALL
,
1811 currently_stepping (ecs
), TARGET_SIGNAL_0
);
1812 prepare_to_wait (ecs
);
1817 breakpoints_inserted
= 0;
1818 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1819 context_switch (ecs
);
1820 ecs
->waiton_ptid
= ecs
->ptid
;
1821 ecs
->wp
= &(ecs
->ws
);
1822 ecs
->another_trap
= 1;
1824 ecs
->infwait_state
= infwait_thread_hop_state
;
1826 registers_changed ();
1830 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1832 sw_single_step_trap_p
= 1;
1833 ecs
->random_signal
= 0;
1837 ecs
->random_signal
= 1;
1839 /* See if something interesting happened to the non-current thread. If
1840 so, then switch to that thread. */
1841 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1843 context_switch (ecs
);
1845 if (deprecated_context_hook
)
1846 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
1848 flush_cached_frames ();
1851 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1853 /* Pull the single step breakpoints out of the target. */
1854 SOFTWARE_SINGLE_STEP (0, 0);
1855 singlestep_breakpoints_inserted_p
= 0;
1858 /* If PC is pointing at a nullified instruction, then step beyond
1859 it so that the user won't be confused when GDB appears to be ready
1862 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1863 if (INSTRUCTION_NULLIFIED
)
1865 registers_changed ();
1866 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1868 /* We may have received a signal that we want to pass to
1869 the inferior; therefore, we must not clobber the waitstatus
1872 ecs
->infwait_state
= infwait_nullified_state
;
1873 ecs
->waiton_ptid
= ecs
->ptid
;
1874 ecs
->wp
= &(ecs
->tmpstatus
);
1875 prepare_to_wait (ecs
);
1879 /* It may not be necessary to disable the watchpoint to stop over
1880 it. For example, the PA can (with some kernel cooperation)
1881 single step over a watchpoint without disabling the watchpoint. */
1882 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1885 prepare_to_wait (ecs
);
1889 /* It is far more common to need to disable a watchpoint to step
1890 the inferior over it. FIXME. What else might a debug
1891 register or page protection watchpoint scheme need here? */
1892 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1894 /* At this point, we are stopped at an instruction which has
1895 attempted to write to a piece of memory under control of
1896 a watchpoint. The instruction hasn't actually executed
1897 yet. If we were to evaluate the watchpoint expression
1898 now, we would get the old value, and therefore no change
1899 would seem to have occurred.
1901 In order to make watchpoints work `right', we really need
1902 to complete the memory write, and then evaluate the
1903 watchpoint expression. The following code does that by
1904 removing the watchpoint (actually, all watchpoints and
1905 breakpoints), single-stepping the target, re-inserting
1906 watchpoints, and then falling through to let normal
1907 single-step processing handle proceed. Since this
1908 includes evaluating watchpoints, things will come to a
1909 stop in the correct manner. */
1911 remove_breakpoints ();
1912 registers_changed ();
1913 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
1915 ecs
->waiton_ptid
= ecs
->ptid
;
1916 ecs
->wp
= &(ecs
->ws
);
1917 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1918 prepare_to_wait (ecs
);
1922 /* It may be possible to simply continue after a watchpoint. */
1923 if (HAVE_CONTINUABLE_WATCHPOINT
)
1924 STOPPED_BY_WATCHPOINT (ecs
->ws
);
1926 ecs
->stop_func_start
= 0;
1927 ecs
->stop_func_end
= 0;
1928 ecs
->stop_func_name
= 0;
1929 /* Don't care about return value; stop_func_start and stop_func_name
1930 will both be 0 if it doesn't work. */
1931 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1932 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1933 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
1934 ecs
->another_trap
= 0;
1935 bpstat_clear (&stop_bpstat
);
1937 stop_stack_dummy
= 0;
1938 stop_print_frame
= 1;
1939 ecs
->random_signal
= 0;
1940 stopped_by_random_signal
= 0;
1941 breakpoints_failed
= 0;
1943 /* Look at the cause of the stop, and decide what to do.
1944 The alternatives are:
1945 1) break; to really stop and return to the debugger,
1946 2) drop through to start up again
1947 (set ecs->another_trap to 1 to single step once)
1948 3) set ecs->random_signal to 1, and the decision between 1 and 2
1949 will be made according to the signal handling tables. */
1951 /* First, distinguish signals caused by the debugger from signals
1952 that have to do with the program's own actions. Note that
1953 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1954 on the operating system version. Here we detect when a SIGILL or
1955 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1956 something similar for SIGSEGV, since a SIGSEGV will be generated
1957 when we're trying to execute a breakpoint instruction on a
1958 non-executable stack. This happens for call dummy breakpoints
1959 for architectures like SPARC that place call dummies on the
1962 if (stop_signal
== TARGET_SIGNAL_TRAP
1963 || (breakpoints_inserted
&&
1964 (stop_signal
== TARGET_SIGNAL_ILL
1965 || stop_signal
== TARGET_SIGNAL_SEGV
1966 || stop_signal
== TARGET_SIGNAL_EMT
))
1967 || stop_soon
== STOP_QUIETLY
1968 || stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1970 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
1972 stop_print_frame
= 0;
1973 stop_stepping (ecs
);
1977 /* This is originated from start_remote(), start_inferior() and
1978 shared libraries hook functions. */
1979 if (stop_soon
== STOP_QUIETLY
)
1981 stop_stepping (ecs
);
1985 /* This originates from attach_command(). We need to overwrite
1986 the stop_signal here, because some kernels don't ignore a
1987 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1988 See more comments in inferior.h. */
1989 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
)
1991 stop_stepping (ecs
);
1992 if (stop_signal
== TARGET_SIGNAL_STOP
)
1993 stop_signal
= TARGET_SIGNAL_0
;
1997 /* Don't even think about breakpoints
1998 if just proceeded over a breakpoint.
2000 However, if we are trying to proceed over a breakpoint
2001 and end up in sigtramp, then through_sigtramp_breakpoint
2002 will be set and we should check whether we've hit the
2004 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
2005 && through_sigtramp_breakpoint
== NULL
)
2006 bpstat_clear (&stop_bpstat
);
2009 /* See if there is a breakpoint at the current PC. */
2010 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2012 /* Following in case break condition called a
2014 stop_print_frame
= 1;
2017 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2018 at one stage in the past included checks for an inferior
2019 function call's call dummy's return breakpoint. The original
2020 comment, that went with the test, read:
2022 ``End of a stack dummy. Some systems (e.g. Sony news) give
2023 another signal besides SIGTRAP, so check here as well as
2026 If someone ever tries to get get call dummys on a
2027 non-executable stack to work (where the target would stop
2028 with something like a SIGSEGV), then those tests might need
2029 to be re-instated. Given, however, that the tests were only
2030 enabled when momentary breakpoints were not being used, I
2031 suspect that it won't be the case.
2033 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2034 be necessary for call dummies on a non-executable stack on
2037 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2039 = !(bpstat_explains_signal (stop_bpstat
)
2041 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2044 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
2045 if (!ecs
->random_signal
)
2046 stop_signal
= TARGET_SIGNAL_TRAP
;
2050 /* When we reach this point, we've pretty much decided
2051 that the reason for stopping must've been a random
2052 (unexpected) signal. */
2055 ecs
->random_signal
= 1;
2057 process_event_stop_test
:
2058 /* For the program's own signals, act according to
2059 the signal handling tables. */
2061 if (ecs
->random_signal
)
2063 /* Signal not for debugging purposes. */
2066 stopped_by_random_signal
= 1;
2068 if (signal_print
[stop_signal
])
2071 target_terminal_ours_for_output ();
2072 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2074 if (signal_stop
[stop_signal
])
2076 stop_stepping (ecs
);
2079 /* If not going to stop, give terminal back
2080 if we took it away. */
2082 target_terminal_inferior ();
2084 /* Clear the signal if it should not be passed. */
2085 if (signal_program
[stop_signal
] == 0)
2086 stop_signal
= TARGET_SIGNAL_0
;
2088 /* I'm not sure whether this needs to be check_sigtramp2 or
2089 whether it could/should be keep_going.
2091 This used to jump to step_over_function if we are stepping,
2094 Suppose the user does a `next' over a function call, and while
2095 that call is in progress, the inferior receives a signal for
2096 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2097 that case, when we reach this point, there is already a
2098 step-resume breakpoint established, right where it should be:
2099 immediately after the function call the user is "next"-ing
2100 over. If we call step_over_function now, two bad things
2103 - we'll create a new breakpoint, at wherever the current
2104 frame's return address happens to be. That could be
2105 anywhere, depending on what function call happens to be on
2106 the top of the stack at that point. Point is, it's probably
2107 not where we need it.
2109 - the existing step-resume breakpoint (which is at the correct
2110 address) will get orphaned: step_resume_breakpoint will point
2111 to the new breakpoint, and the old step-resume breakpoint
2112 will never be cleaned up.
2114 The old behavior was meant to help HP-UX single-step out of
2115 sigtramps. It would place the new breakpoint at prev_pc, which
2116 was certainly wrong. I don't know the details there, so fixing
2117 this probably breaks that. As with anything else, it's up to
2118 the HP-UX maintainer to furnish a fix that doesn't break other
2119 platforms. --JimB, 20 May 1999 */
2120 check_sigtramp2 (ecs
);
2125 /* Handle cases caused by hitting a breakpoint. */
2127 CORE_ADDR jmp_buf_pc
;
2128 struct bpstat_what what
;
2130 what
= bpstat_what (stop_bpstat
);
2132 if (what
.call_dummy
)
2134 stop_stack_dummy
= 1;
2136 trap_expected_after_continue
= 1;
2140 switch (what
.main_action
)
2142 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2143 /* If we hit the breakpoint at longjmp, disable it for the
2144 duration of this command. Then, install a temporary
2145 breakpoint at the target of the jmp_buf. */
2146 disable_longjmp_breakpoint ();
2147 remove_breakpoints ();
2148 breakpoints_inserted
= 0;
2149 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc
))
2155 /* Need to blow away step-resume breakpoint, as it
2156 interferes with us */
2157 if (step_resume_breakpoint
!= NULL
)
2159 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2161 /* Not sure whether we need to blow this away too, but probably
2162 it is like the step-resume breakpoint. */
2163 if (through_sigtramp_breakpoint
!= NULL
)
2165 delete_breakpoint (through_sigtramp_breakpoint
);
2166 through_sigtramp_breakpoint
= NULL
;
2170 /* FIXME - Need to implement nested temporary breakpoints */
2171 if (step_over_calls
> 0)
2172 set_longjmp_resume_breakpoint (jmp_buf_pc
, get_current_frame ());
2175 set_longjmp_resume_breakpoint (jmp_buf_pc
, null_frame_id
);
2176 ecs
->handling_longjmp
= 1; /* FIXME */
2180 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2181 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2182 remove_breakpoints ();
2183 breakpoints_inserted
= 0;
2185 /* FIXME - Need to implement nested temporary breakpoints */
2187 && (frame_id_inner (get_frame_id (get_current_frame ()),
2190 ecs
->another_trap
= 1;
2195 disable_longjmp_breakpoint ();
2196 ecs
->handling_longjmp
= 0; /* FIXME */
2197 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2199 /* else fallthrough */
2201 case BPSTAT_WHAT_SINGLE
:
2202 if (breakpoints_inserted
)
2204 remove_breakpoints ();
2206 breakpoints_inserted
= 0;
2207 ecs
->another_trap
= 1;
2208 /* Still need to check other stuff, at least the case
2209 where we are stepping and step out of the right range. */
2212 case BPSTAT_WHAT_STOP_NOISY
:
2213 stop_print_frame
= 1;
2215 /* We are about to nuke the step_resume_breakpoint and
2216 through_sigtramp_breakpoint via the cleanup chain, so
2217 no need to worry about it here. */
2219 stop_stepping (ecs
);
2222 case BPSTAT_WHAT_STOP_SILENT
:
2223 stop_print_frame
= 0;
2225 /* We are about to nuke the step_resume_breakpoint and
2226 through_sigtramp_breakpoint via the cleanup chain, so
2227 no need to worry about it here. */
2229 stop_stepping (ecs
);
2232 case BPSTAT_WHAT_STEP_RESUME
:
2233 /* This proably demands a more elegant solution, but, yeah
2236 This function's use of the simple variable
2237 step_resume_breakpoint doesn't seem to accomodate
2238 simultaneously active step-resume bp's, although the
2239 breakpoint list certainly can.
2241 If we reach here and step_resume_breakpoint is already
2242 NULL, then apparently we have multiple active
2243 step-resume bp's. We'll just delete the breakpoint we
2244 stopped at, and carry on.
2246 Correction: what the code currently does is delete a
2247 step-resume bp, but it makes no effort to ensure that
2248 the one deleted is the one currently stopped at. MVS */
2250 if (step_resume_breakpoint
== NULL
)
2252 step_resume_breakpoint
=
2253 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2255 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2258 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2259 if (through_sigtramp_breakpoint
)
2260 delete_breakpoint (through_sigtramp_breakpoint
);
2261 through_sigtramp_breakpoint
= NULL
;
2263 /* If were waiting for a trap, hitting the step_resume_break
2264 doesn't count as getting it. */
2266 ecs
->another_trap
= 1;
2269 case BPSTAT_WHAT_CHECK_SHLIBS
:
2270 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2273 /* Remove breakpoints, we eventually want to step over the
2274 shlib event breakpoint, and SOLIB_ADD might adjust
2275 breakpoint addresses via breakpoint_re_set. */
2276 if (breakpoints_inserted
)
2277 remove_breakpoints ();
2278 breakpoints_inserted
= 0;
2280 /* Check for any newly added shared libraries if we're
2281 supposed to be adding them automatically. Switch
2282 terminal for any messages produced by
2283 breakpoint_re_set. */
2284 target_terminal_ours_for_output ();
2285 /* NOTE: cagney/2003-11-25: Make certain that the target
2286 stack's section table is kept up-to-date. Architectures,
2287 (e.g., PPC64), use the section table to perform
2288 operations such as address => section name and hence
2289 require the table to contain all sections (including
2290 those found in shared libraries). */
2291 /* NOTE: cagney/2003-11-25: Pass current_target and not
2292 exec_ops to SOLIB_ADD. This is because current GDB is
2293 only tooled to propagate section_table changes out from
2294 the "current_target" (see target_resize_to_sections), and
2295 not up from the exec stratum. This, of course, isn't
2296 right. "infrun.c" should only interact with the
2297 exec/process stratum, instead relying on the target stack
2298 to propagate relevant changes (stop, section table
2299 changed, ...) up to other layers. */
2300 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2301 target_terminal_inferior ();
2303 /* Try to reenable shared library breakpoints, additional
2304 code segments in shared libraries might be mapped in now. */
2305 re_enable_breakpoints_in_shlibs ();
2307 /* If requested, stop when the dynamic linker notifies
2308 gdb of events. This allows the user to get control
2309 and place breakpoints in initializer routines for
2310 dynamically loaded objects (among other things). */
2311 if (stop_on_solib_events
|| stop_stack_dummy
)
2313 stop_stepping (ecs
);
2317 /* If we stopped due to an explicit catchpoint, then the
2318 (see above) call to SOLIB_ADD pulled in any symbols
2319 from a newly-loaded library, if appropriate.
2321 We do want the inferior to stop, but not where it is
2322 now, which is in the dynamic linker callback. Rather,
2323 we would like it stop in the user's program, just after
2324 the call that caused this catchpoint to trigger. That
2325 gives the user a more useful vantage from which to
2326 examine their program's state. */
2327 else if (what
.main_action
==
2328 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2330 /* ??rehrauer: If I could figure out how to get the
2331 right return PC from here, we could just set a temp
2332 breakpoint and resume. I'm not sure we can without
2333 cracking open the dld's shared libraries and sniffing
2334 their unwind tables and text/data ranges, and that's
2335 not a terribly portable notion.
2337 Until that time, we must step the inferior out of the
2338 dld callback, and also out of the dld itself (and any
2339 code or stubs in libdld.sl, such as "shl_load" and
2340 friends) until we reach non-dld code. At that point,
2341 we can stop stepping. */
2342 bpstat_get_triggered_catchpoints (stop_bpstat
,
2344 stepping_through_solib_catchpoints
);
2345 ecs
->stepping_through_solib_after_catch
= 1;
2347 /* Be sure to lift all breakpoints, so the inferior does
2348 actually step past this point... */
2349 ecs
->another_trap
= 1;
2354 /* We want to step over this breakpoint, then keep going. */
2355 ecs
->another_trap
= 1;
2362 case BPSTAT_WHAT_LAST
:
2363 /* Not a real code, but listed here to shut up gcc -Wall. */
2365 case BPSTAT_WHAT_KEEP_CHECKING
:
2370 /* We come here if we hit a breakpoint but should not
2371 stop for it. Possibly we also were stepping
2372 and should stop for that. So fall through and
2373 test for stepping. But, if not stepping,
2376 /* Are we stepping to get the inferior out of the dynamic
2377 linker's hook (and possibly the dld itself) after catching
2379 if (ecs
->stepping_through_solib_after_catch
)
2381 #if defined(SOLIB_ADD)
2382 /* Have we reached our destination? If not, keep going. */
2383 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2385 ecs
->another_trap
= 1;
2390 /* Else, stop and report the catchpoint(s) whose triggering
2391 caused us to begin stepping. */
2392 ecs
->stepping_through_solib_after_catch
= 0;
2393 bpstat_clear (&stop_bpstat
);
2394 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2395 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2396 stop_print_frame
= 1;
2397 stop_stepping (ecs
);
2401 if (step_resume_breakpoint
)
2403 /* Having a step-resume breakpoint overrides anything
2404 else having to do with stepping commands until
2405 that breakpoint is reached. */
2406 /* I'm not sure whether this needs to be check_sigtramp2 or
2407 whether it could/should be keep_going. */
2408 check_sigtramp2 (ecs
);
2413 if (step_range_end
== 0)
2415 /* Likewise if we aren't even stepping. */
2416 /* I'm not sure whether this needs to be check_sigtramp2 or
2417 whether it could/should be keep_going. */
2418 check_sigtramp2 (ecs
);
2423 /* If stepping through a line, keep going if still within it.
2425 Note that step_range_end is the address of the first instruction
2426 beyond the step range, and NOT the address of the last instruction
2428 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2430 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2431 So definately need to check for sigtramp here. */
2432 check_sigtramp2 (ecs
);
2437 /* We stepped out of the stepping range. */
2439 /* If we are stepping at the source level and entered the runtime
2440 loader dynamic symbol resolution code, we keep on single stepping
2441 until we exit the run time loader code and reach the callee's
2443 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2444 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2446 CORE_ADDR pc_after_resolver
=
2447 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2449 if (pc_after_resolver
)
2451 /* Set up a step-resume breakpoint at the address
2452 indicated by SKIP_SOLIB_RESOLVER. */
2453 struct symtab_and_line sr_sal
;
2455 sr_sal
.pc
= pc_after_resolver
;
2457 check_for_old_step_resume_breakpoint ();
2458 step_resume_breakpoint
=
2459 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2460 if (breakpoints_inserted
)
2461 insert_breakpoints ();
2468 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2469 && ecs
->stop_func_name
== NULL
)
2471 /* There is no symbol, not even a minimal symbol, corresponding
2472 to the address where we just stopped. So we just stepped
2473 inside undebuggable code. Since we want to step over this
2474 kind of code, we keep going until the inferior returns from
2475 the current function. */
2476 handle_step_into_function (ecs
);
2480 /* We can't update step_sp every time through the loop, because
2481 reading the stack pointer would slow down stepping too much.
2482 But we can update it every time we leave the step range. */
2483 ecs
->update_step_sp
= 1;
2485 /* Did we just step into a singal trampoline (either by stepping out
2486 of a handler, or by taking a signal)? */
2487 if (get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
2488 && !frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
))
2491 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2493 if (frame_id_inner (current_frame
, step_frame_id
))
2495 /* We have just taken a signal; go until we are back to
2496 the point where we took it and one more. */
2498 /* This code is needed at least in the following case:
2499 The user types "next" and then a signal arrives (before
2500 the "next" is done). */
2502 /* Note that if we are stopped at a breakpoint, then we need
2503 the step_resume breakpoint to override any breakpoints at
2504 the same location, so that we will still step over the
2505 breakpoint even though the signal happened. */
2506 struct symtab_and_line sr_sal
;
2509 sr_sal
.symtab
= NULL
;
2511 sr_sal
.pc
= prev_pc
;
2512 /* We could probably be setting the frame to
2513 step_frame_id; I don't think anyone thought to try it. */
2514 check_for_old_step_resume_breakpoint ();
2515 step_resume_breakpoint
=
2516 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2517 if (breakpoints_inserted
)
2518 insert_breakpoints ();
2522 /* We just stepped out of a signal handler and into
2523 its calling trampoline.
2525 Normally, we'd call step_over_function from
2526 here, but for some reason GDB can't unwind the
2527 stack correctly to find the real PC for the point
2528 user code where the signal trampoline will return
2529 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2530 But signal trampolines are pretty small stubs of
2531 code, anyway, so it's OK instead to just
2532 single-step out. Note: assuming such trampolines
2533 don't exhibit recursion on any platform... */
2534 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2535 &ecs
->stop_func_start
,
2536 &ecs
->stop_func_end
);
2537 /* Readjust stepping range */
2538 step_range_start
= ecs
->stop_func_start
;
2539 step_range_end
= ecs
->stop_func_end
;
2540 ecs
->stepping_through_sigtramp
= 1;
2545 /* If this is stepi or nexti, make sure that the stepping range
2546 gets us past that instruction. */
2547 if (step_range_end
== 1)
2548 /* FIXME: Does this run afoul of the code below which, if
2549 we step into the middle of a line, resets the stepping
2551 step_range_end
= (step_range_start
= prev_pc
) + 1;
2553 ecs
->remove_breakpoints_on_following_step
= 1;
2558 if (frame_id_eq (get_frame_id (get_prev_frame (get_current_frame ())),
2561 /* It's a subroutine call. */
2562 handle_step_into_function (ecs
);
2566 /* We've wandered out of the step range. */
2568 ecs
->sal
= find_pc_line (stop_pc
, 0);
2570 if (step_range_end
== 1)
2572 /* It is stepi or nexti. We always want to stop stepping after
2575 print_stop_reason (END_STEPPING_RANGE
, 0);
2576 stop_stepping (ecs
);
2580 /* If we're in the return path from a shared library trampoline,
2581 we want to proceed through the trampoline when stepping. */
2582 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2584 /* Determine where this trampoline returns. */
2585 CORE_ADDR real_stop_pc
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2587 /* Only proceed through if we know where it's going. */
2590 /* And put the step-breakpoint there and go until there. */
2591 struct symtab_and_line sr_sal
;
2593 init_sal (&sr_sal
); /* initialize to zeroes */
2594 sr_sal
.pc
= real_stop_pc
;
2595 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2596 /* Do not specify what the fp should be when we stop
2597 since on some machines the prologue
2598 is where the new fp value is established. */
2599 check_for_old_step_resume_breakpoint ();
2600 step_resume_breakpoint
=
2601 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2602 if (breakpoints_inserted
)
2603 insert_breakpoints ();
2605 /* Restart without fiddling with the step ranges or
2612 if (ecs
->sal
.line
== 0)
2614 /* We have no line number information. That means to stop
2615 stepping (does this always happen right after one instruction,
2616 when we do "s" in a function with no line numbers,
2617 or can this happen as a result of a return or longjmp?). */
2619 print_stop_reason (END_STEPPING_RANGE
, 0);
2620 stop_stepping (ecs
);
2624 if ((stop_pc
== ecs
->sal
.pc
)
2625 && (ecs
->current_line
!= ecs
->sal
.line
2626 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
2628 /* We are at the start of a different line. So stop. Note that
2629 we don't stop if we step into the middle of a different line.
2630 That is said to make things like for (;;) statements work
2633 print_stop_reason (END_STEPPING_RANGE
, 0);
2634 stop_stepping (ecs
);
2638 /* We aren't done stepping.
2640 Optimize by setting the stepping range to the line.
2641 (We might not be in the original line, but if we entered a
2642 new line in mid-statement, we continue stepping. This makes
2643 things like for(;;) statements work better.) */
2645 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2647 /* If this is the last line of the function, don't keep stepping
2648 (it would probably step us out of the function).
2649 This is particularly necessary for a one-line function,
2650 in which after skipping the prologue we better stop even though
2651 we will be in mid-line. */
2653 print_stop_reason (END_STEPPING_RANGE
, 0);
2654 stop_stepping (ecs
);
2657 step_range_start
= ecs
->sal
.pc
;
2658 step_range_end
= ecs
->sal
.end
;
2659 step_frame_id
= get_frame_id (get_current_frame ());
2660 ecs
->current_line
= ecs
->sal
.line
;
2661 ecs
->current_symtab
= ecs
->sal
.symtab
;
2663 /* In the case where we just stepped out of a function into the
2664 middle of a line of the caller, continue stepping, but
2665 step_frame_id must be modified to current frame */
2667 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2668 generous. It will trigger on things like a step into a frameless
2669 stackless leaf function. I think the logic should instead look
2670 at the unwound frame ID has that should give a more robust
2671 indication of what happened. */
2672 if (step
-ID
== current
-ID
)
2673 still stepping in same function
;
2674 else if (step
-ID
== unwind (current
-ID
))
2675 stepped into a function
;
2677 stepped out of a function
;
2678 /* Of course this assumes that the frame ID unwind code is robust
2679 and we're willing to introduce frame unwind logic into this
2680 function. Fortunately, those days are nearly upon us. */
2683 struct frame_id current_frame
= get_frame_id (get_current_frame ());
2684 if (!(frame_id_inner (current_frame
, step_frame_id
)))
2685 step_frame_id
= current_frame
;
2691 /* Are we in the middle of stepping? */
2694 currently_stepping (struct execution_control_state
*ecs
)
2696 return ((through_sigtramp_breakpoint
== NULL
2697 && !ecs
->handling_longjmp
2698 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2700 || ecs
->stepping_through_solib_after_catch
2701 || bpstat_should_step ());
2705 check_sigtramp2 (struct execution_control_state
*ecs
)
2708 struct symtab_and_line sr_sal
;
2710 /* Check that what has happened here is that we have just stepped
2711 the inferior with a signal (because it is a signal which
2712 shouldn't make us stop), thus stepping into sigtramp. */
2716 if (get_frame_type (get_current_frame ()) != SIGTRAMP_FRAME
)
2719 /* So we need to set a step_resume_break_address breakpoint and
2720 continue until we hit it, and then step. FIXME: This should be
2721 more enduring than a step_resume breakpoint; we should know that
2722 we will later need to keep going rather than re-hitting the
2723 breakpoint here (see the testsuite, gdb.base/signals.exp where it
2724 says "exceedingly difficult"). */
2726 init_sal (&sr_sal
); /* initialize to zeroes */
2727 sr_sal
.pc
= prev_pc
;
2728 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2729 /* We perhaps could set the frame if we kept track of what the frame
2730 corresponding to prev_pc was. But we don't, so don't. */
2731 through_sigtramp_breakpoint
=
2732 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_through_sigtramp
);
2733 if (breakpoints_inserted
)
2734 insert_breakpoints ();
2736 ecs
->remove_breakpoints_on_following_step
= 1;
2737 ecs
->another_trap
= 1;
2740 /* Subroutine call with source code we should not step over. Do step
2741 to the first line of code in it. */
2744 step_into_function (struct execution_control_state
*ecs
)
2747 struct symtab_and_line sr_sal
;
2749 s
= find_pc_symtab (stop_pc
);
2750 if (s
&& s
->language
!= language_asm
)
2751 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2753 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2754 /* Use the step_resume_break to step until the end of the prologue,
2755 even if that involves jumps (as it seems to on the vax under
2757 /* If the prologue ends in the middle of a source line, continue to
2758 the end of that source line (if it is still within the function).
2759 Otherwise, just go to end of prologue. */
2761 && ecs
->sal
.pc
!= ecs
->stop_func_start
2762 && ecs
->sal
.end
< ecs
->stop_func_end
)
2763 ecs
->stop_func_start
= ecs
->sal
.end
;
2765 /* Architectures which require breakpoint adjustment might not be able
2766 to place a breakpoint at the computed address. If so, the test
2767 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2768 ecs->stop_func_start to an address at which a breakpoint may be
2769 legitimately placed.
2771 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2772 made, GDB will enter an infinite loop when stepping through
2773 optimized code consisting of VLIW instructions which contain
2774 subinstructions corresponding to different source lines. On
2775 FR-V, it's not permitted to place a breakpoint on any but the
2776 first subinstruction of a VLIW instruction. When a breakpoint is
2777 set, GDB will adjust the breakpoint address to the beginning of
2778 the VLIW instruction. Thus, we need to make the corresponding
2779 adjustment here when computing the stop address. */
2781 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
2783 ecs
->stop_func_start
2784 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
2785 ecs
->stop_func_start
);
2788 if (ecs
->stop_func_start
== stop_pc
)
2790 /* We are already there: stop now. */
2792 print_stop_reason (END_STEPPING_RANGE
, 0);
2793 stop_stepping (ecs
);
2798 /* Put the step-breakpoint there and go until there. */
2799 init_sal (&sr_sal
); /* initialize to zeroes */
2800 sr_sal
.pc
= ecs
->stop_func_start
;
2801 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2802 /* Do not specify what the fp should be when we stop since on
2803 some machines the prologue is where the new fp value is
2805 check_for_old_step_resume_breakpoint ();
2806 step_resume_breakpoint
=
2807 set_momentary_breakpoint (sr_sal
, null_frame_id
, bp_step_resume
);
2808 if (breakpoints_inserted
)
2809 insert_breakpoints ();
2811 /* And make sure stepping stops right away then. */
2812 step_range_end
= step_range_start
;
2817 /* We've just entered a callee, and we wish to resume until it returns
2818 to the caller. Setting a step_resume breakpoint on the return
2819 address will catch a return from the callee.
2821 However, if the callee is recursing, we want to be careful not to
2822 catch returns of those recursive calls, but only of THIS instance
2825 To do this, we set the step_resume bp's frame to our current
2826 caller's frame (obtained by doing a frame ID unwind). */
2829 step_over_function (struct execution_control_state
*ecs
)
2831 struct symtab_and_line sr_sal
;
2832 struct frame_id sr_id
;
2834 init_sal (&sr_sal
); /* initialize to zeros */
2836 /* NOTE: cagney/2003-04-06:
2838 At this point the equality get_frame_pc() == get_frame_func()
2839 should hold. This may make it possible for this code to tell the
2840 frame where it's function is, instead of the reverse. This would
2841 avoid the need to search for the frame's function, which can get
2842 very messy when there is no debug info available (look at the
2843 heuristic find pc start code found in targets like the MIPS). */
2845 /* NOTE: cagney/2003-04-06:
2847 The intent of DEPRECATED_SAVED_PC_AFTER_CALL was to:
2849 - provide a very light weight equivalent to frame_unwind_pc()
2850 (nee FRAME_SAVED_PC) that avoids the prologue analyzer
2852 - avoid handling the case where the PC hasn't been saved in the
2855 Unfortunately, not five lines further down, is a call to
2856 get_frame_id() and that is guarenteed to trigger the prologue
2859 The `correct fix' is for the prologe analyzer to handle the case
2860 where the prologue is incomplete (PC in prologue) and,
2861 consequently, the return pc has not yet been saved. It should be
2862 noted that the prologue analyzer needs to handle this case
2863 anyway: frameless leaf functions that don't save the return PC;
2864 single stepping through a prologue.
2866 The d10v handles all this by bailing out of the prologue analsis
2867 when it reaches the current instruction. */
2869 if (DEPRECATED_SAVED_PC_AFTER_CALL_P ())
2870 sr_sal
.pc
= ADDR_BITS_REMOVE (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ()));
2872 sr_sal
.pc
= ADDR_BITS_REMOVE (frame_pc_unwind (get_current_frame ()));
2873 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2875 check_for_old_step_resume_breakpoint ();
2877 /* NOTE: cagney/2004-03-31: Code using the current value of
2878 "step_frame_id", instead of unwinding that frame ID, removed. On
2879 s390 GNU/Linux, after taking a signal, the program is directly
2880 resumed at the signal handler and, consequently, the PC would
2881 point at at the first instruction of that signal handler but
2882 STEP_FRAME_ID would [incorrectly] at the interrupted code when it
2883 should point at the signal trampoline. By always and locally
2884 doing a frame ID unwind, it's possible to assert that the code is
2885 always using the correct ID. */
2886 sr_id
= frame_unwind_id (get_current_frame ());
2888 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
2890 if (breakpoints_inserted
)
2891 insert_breakpoints ();
2895 stop_stepping (struct execution_control_state
*ecs
)
2897 /* Let callers know we don't want to wait for the inferior anymore. */
2898 ecs
->wait_some_more
= 0;
2901 /* This function handles various cases where we need to continue
2902 waiting for the inferior. */
2903 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2906 keep_going (struct execution_control_state
*ecs
)
2908 /* Save the pc before execution, to compare with pc after stop. */
2909 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2911 if (ecs
->update_step_sp
)
2912 step_sp
= read_sp ();
2913 ecs
->update_step_sp
= 0;
2915 /* If we did not do break;, it means we should keep running the
2916 inferior and not return to debugger. */
2918 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2920 /* We took a signal (which we are supposed to pass through to
2921 the inferior, else we'd have done a break above) and we
2922 haven't yet gotten our trap. Simply continue. */
2923 resume (currently_stepping (ecs
), stop_signal
);
2927 /* Either the trap was not expected, but we are continuing
2928 anyway (the user asked that this signal be passed to the
2931 The signal was SIGTRAP, e.g. it was our signal, but we
2932 decided we should resume from it.
2934 We're going to run this baby now!
2936 Insert breakpoints now, unless we are trying to one-proceed
2937 past a breakpoint. */
2938 /* If we've just finished a special step resume and we don't
2939 want to hit a breakpoint, pull em out. */
2940 if (step_resume_breakpoint
== NULL
2941 && through_sigtramp_breakpoint
== NULL
2942 && ecs
->remove_breakpoints_on_following_step
)
2944 ecs
->remove_breakpoints_on_following_step
= 0;
2945 remove_breakpoints ();
2946 breakpoints_inserted
= 0;
2948 else if (!breakpoints_inserted
&&
2949 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
2951 breakpoints_failed
= insert_breakpoints ();
2952 if (breakpoints_failed
)
2954 stop_stepping (ecs
);
2957 breakpoints_inserted
= 1;
2960 trap_expected
= ecs
->another_trap
;
2962 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2963 specifies that such a signal should be delivered to the
2966 Typically, this would occure when a user is debugging a
2967 target monitor on a simulator: the target monitor sets a
2968 breakpoint; the simulator encounters this break-point and
2969 halts the simulation handing control to GDB; GDB, noteing
2970 that the break-point isn't valid, returns control back to the
2971 simulator; the simulator then delivers the hardware
2972 equivalent of a SIGNAL_TRAP to the program being debugged. */
2974 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
2975 stop_signal
= TARGET_SIGNAL_0
;
2978 resume (currently_stepping (ecs
), stop_signal
);
2981 prepare_to_wait (ecs
);
2984 /* This function normally comes after a resume, before
2985 handle_inferior_event exits. It takes care of any last bits of
2986 housekeeping, and sets the all-important wait_some_more flag. */
2989 prepare_to_wait (struct execution_control_state
*ecs
)
2991 if (ecs
->infwait_state
== infwait_normal_state
)
2993 overlay_cache_invalid
= 1;
2995 /* We have to invalidate the registers BEFORE calling
2996 target_wait because they can be loaded from the target while
2997 in target_wait. This makes remote debugging a bit more
2998 efficient for those targets that provide critical registers
2999 as part of their normal status mechanism. */
3001 registers_changed ();
3002 ecs
->waiton_ptid
= pid_to_ptid (-1);
3003 ecs
->wp
= &(ecs
->ws
);
3005 /* This is the old end of the while loop. Let everybody know we
3006 want to wait for the inferior some more and get called again
3008 ecs
->wait_some_more
= 1;
3011 /* Print why the inferior has stopped. We always print something when
3012 the inferior exits, or receives a signal. The rest of the cases are
3013 dealt with later on in normal_stop() and print_it_typical(). Ideally
3014 there should be a call to this function from handle_inferior_event()
3015 each time stop_stepping() is called.*/
3017 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3019 switch (stop_reason
)
3022 /* We don't deal with these cases from handle_inferior_event()
3025 case END_STEPPING_RANGE
:
3026 /* We are done with a step/next/si/ni command. */
3027 /* For now print nothing. */
3028 /* Print a message only if not in the middle of doing a "step n"
3029 operation for n > 1 */
3030 if (!step_multi
|| !stop_step
)
3031 if (ui_out_is_mi_like_p (uiout
))
3032 ui_out_field_string (uiout
, "reason", "end-stepping-range");
3034 case BREAKPOINT_HIT
:
3035 /* We found a breakpoint. */
3036 /* For now print nothing. */
3039 /* The inferior was terminated by a signal. */
3040 annotate_signalled ();
3041 if (ui_out_is_mi_like_p (uiout
))
3042 ui_out_field_string (uiout
, "reason", "exited-signalled");
3043 ui_out_text (uiout
, "\nProgram terminated with signal ");
3044 annotate_signal_name ();
3045 ui_out_field_string (uiout
, "signal-name",
3046 target_signal_to_name (stop_info
));
3047 annotate_signal_name_end ();
3048 ui_out_text (uiout
, ", ");
3049 annotate_signal_string ();
3050 ui_out_field_string (uiout
, "signal-meaning",
3051 target_signal_to_string (stop_info
));
3052 annotate_signal_string_end ();
3053 ui_out_text (uiout
, ".\n");
3054 ui_out_text (uiout
, "The program no longer exists.\n");
3057 /* The inferior program is finished. */
3058 annotate_exited (stop_info
);
3061 if (ui_out_is_mi_like_p (uiout
))
3062 ui_out_field_string (uiout
, "reason", "exited");
3063 ui_out_text (uiout
, "\nProgram exited with code ");
3064 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3065 (unsigned int) stop_info
);
3066 ui_out_text (uiout
, ".\n");
3070 if (ui_out_is_mi_like_p (uiout
))
3071 ui_out_field_string (uiout
, "reason", "exited-normally");
3072 ui_out_text (uiout
, "\nProgram exited normally.\n");
3075 case SIGNAL_RECEIVED
:
3076 /* Signal received. The signal table tells us to print about
3079 ui_out_text (uiout
, "\nProgram received signal ");
3080 annotate_signal_name ();
3081 if (ui_out_is_mi_like_p (uiout
))
3082 ui_out_field_string (uiout
, "reason", "signal-received");
3083 ui_out_field_string (uiout
, "signal-name",
3084 target_signal_to_name (stop_info
));
3085 annotate_signal_name_end ();
3086 ui_out_text (uiout
, ", ");
3087 annotate_signal_string ();
3088 ui_out_field_string (uiout
, "signal-meaning",
3089 target_signal_to_string (stop_info
));
3090 annotate_signal_string_end ();
3091 ui_out_text (uiout
, ".\n");
3094 internal_error (__FILE__
, __LINE__
,
3095 "print_stop_reason: unrecognized enum value");
3101 /* Here to return control to GDB when the inferior stops for real.
3102 Print appropriate messages, remove breakpoints, give terminal our modes.
3104 STOP_PRINT_FRAME nonzero means print the executing frame
3105 (pc, function, args, file, line number and line text).
3106 BREAKPOINTS_FAILED nonzero means stop was due to error
3107 attempting to insert breakpoints. */
3112 struct target_waitstatus last
;
3115 get_last_target_status (&last_ptid
, &last
);
3117 /* As with the notification of thread events, we want to delay
3118 notifying the user that we've switched thread context until
3119 the inferior actually stops.
3121 There's no point in saying anything if the inferior has exited.
3122 Note that SIGNALLED here means "exited with a signal", not
3123 "received a signal". */
3124 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3125 && target_has_execution
3126 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3127 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3129 target_terminal_ours_for_output ();
3130 printf_filtered ("[Switching to %s]\n",
3131 target_pid_or_tid_to_str (inferior_ptid
));
3132 previous_inferior_ptid
= inferior_ptid
;
3135 /* NOTE drow/2004-01-17: Is this still necessary? */
3136 /* Make sure that the current_frame's pc is correct. This
3137 is a correction for setting up the frame info before doing
3138 DECR_PC_AFTER_BREAK */
3139 if (target_has_execution
)
3140 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3141 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3142 frame code to check for this and sort out any resultant mess.
3143 DECR_PC_AFTER_BREAK needs to just go away. */
3144 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3146 if (target_has_execution
&& breakpoints_inserted
)
3148 if (remove_breakpoints ())
3150 target_terminal_ours_for_output ();
3151 printf_filtered ("Cannot remove breakpoints because ");
3152 printf_filtered ("program is no longer writable.\n");
3153 printf_filtered ("It might be running in another process.\n");
3154 printf_filtered ("Further execution is probably impossible.\n");
3157 breakpoints_inserted
= 0;
3159 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3160 Delete any breakpoint that is to be deleted at the next stop. */
3162 breakpoint_auto_delete (stop_bpstat
);
3164 /* If an auto-display called a function and that got a signal,
3165 delete that auto-display to avoid an infinite recursion. */
3167 if (stopped_by_random_signal
)
3168 disable_current_display ();
3170 /* Don't print a message if in the middle of doing a "step n"
3171 operation for n > 1 */
3172 if (step_multi
&& stop_step
)
3175 target_terminal_ours ();
3177 /* Look up the hook_stop and run it (CLI internally handles problem
3178 of stop_command's pre-hook not existing). */
3180 catch_errors (hook_stop_stub
, stop_command
,
3181 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3183 if (!target_has_stack
)
3189 /* Select innermost stack frame - i.e., current frame is frame 0,
3190 and current location is based on that.
3191 Don't do this on return from a stack dummy routine,
3192 or if the program has exited. */
3194 if (!stop_stack_dummy
)
3196 select_frame (get_current_frame ());
3198 /* Print current location without a level number, if
3199 we have changed functions or hit a breakpoint.
3200 Print source line if we have one.
3201 bpstat_print() contains the logic deciding in detail
3202 what to print, based on the event(s) that just occurred. */
3204 if (stop_print_frame
&& deprecated_selected_frame
)
3208 int do_frame_printing
= 1;
3210 bpstat_ret
= bpstat_print (stop_bpstat
);
3214 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3215 (or should) carry around the function and does (or
3216 should) use that when doing a frame comparison. */
3218 && frame_id_eq (step_frame_id
,
3219 get_frame_id (get_current_frame ()))
3220 && step_start_function
== find_pc_function (stop_pc
))
3221 source_flag
= SRC_LINE
; /* finished step, just print source line */
3223 source_flag
= SRC_AND_LOC
; /* print location and source line */
3225 case PRINT_SRC_AND_LOC
:
3226 source_flag
= SRC_AND_LOC
; /* print location and source line */
3228 case PRINT_SRC_ONLY
:
3229 source_flag
= SRC_LINE
;
3232 source_flag
= SRC_LINE
; /* something bogus */
3233 do_frame_printing
= 0;
3236 internal_error (__FILE__
, __LINE__
, "Unknown value.");
3238 /* For mi, have the same behavior every time we stop:
3239 print everything but the source line. */
3240 if (ui_out_is_mi_like_p (uiout
))
3241 source_flag
= LOC_AND_ADDRESS
;
3243 if (ui_out_is_mi_like_p (uiout
))
3244 ui_out_field_int (uiout
, "thread-id",
3245 pid_to_thread_id (inferior_ptid
));
3246 /* The behavior of this routine with respect to the source
3248 SRC_LINE: Print only source line
3249 LOCATION: Print only location
3250 SRC_AND_LOC: Print location and source line */
3251 if (do_frame_printing
)
3252 print_stack_frame (get_selected_frame (), 0, source_flag
);
3254 /* Display the auto-display expressions. */
3259 /* Save the function value return registers, if we care.
3260 We might be about to restore their previous contents. */
3261 if (proceed_to_finish
)
3262 /* NB: The copy goes through to the target picking up the value of
3263 all the registers. */
3264 regcache_cpy (stop_registers
, current_regcache
);
3266 if (stop_stack_dummy
)
3268 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3269 ends with a setting of the current frame, so we can use that
3271 frame_pop (get_current_frame ());
3272 /* Set stop_pc to what it was before we called the function.
3273 Can't rely on restore_inferior_status because that only gets
3274 called if we don't stop in the called function. */
3275 stop_pc
= read_pc ();
3276 select_frame (get_current_frame ());
3280 annotate_stopped ();
3281 observer_notify_normal_stop (stop_bpstat
);
3285 hook_stop_stub (void *cmd
)
3287 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3292 signal_stop_state (int signo
)
3294 return signal_stop
[signo
];
3298 signal_print_state (int signo
)
3300 return signal_print
[signo
];
3304 signal_pass_state (int signo
)
3306 return signal_program
[signo
];
3310 signal_stop_update (int signo
, int state
)
3312 int ret
= signal_stop
[signo
];
3313 signal_stop
[signo
] = state
;
3318 signal_print_update (int signo
, int state
)
3320 int ret
= signal_print
[signo
];
3321 signal_print
[signo
] = state
;
3326 signal_pass_update (int signo
, int state
)
3328 int ret
= signal_program
[signo
];
3329 signal_program
[signo
] = state
;
3334 sig_print_header (void)
3337 Signal Stop\tPrint\tPass to program\tDescription\n");
3341 sig_print_info (enum target_signal oursig
)
3343 char *name
= target_signal_to_name (oursig
);
3344 int name_padding
= 13 - strlen (name
);
3346 if (name_padding
<= 0)
3349 printf_filtered ("%s", name
);
3350 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3351 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3352 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3353 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3354 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3357 /* Specify how various signals in the inferior should be handled. */
3360 handle_command (char *args
, int from_tty
)
3363 int digits
, wordlen
;
3364 int sigfirst
, signum
, siglast
;
3365 enum target_signal oursig
;
3368 unsigned char *sigs
;
3369 struct cleanup
*old_chain
;
3373 error_no_arg ("signal to handle");
3376 /* Allocate and zero an array of flags for which signals to handle. */
3378 nsigs
= (int) TARGET_SIGNAL_LAST
;
3379 sigs
= (unsigned char *) alloca (nsigs
);
3380 memset (sigs
, 0, nsigs
);
3382 /* Break the command line up into args. */
3384 argv
= buildargv (args
);
3389 old_chain
= make_cleanup_freeargv (argv
);
3391 /* Walk through the args, looking for signal oursigs, signal names, and
3392 actions. Signal numbers and signal names may be interspersed with
3393 actions, with the actions being performed for all signals cumulatively
3394 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3396 while (*argv
!= NULL
)
3398 wordlen
= strlen (*argv
);
3399 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3403 sigfirst
= siglast
= -1;
3405 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3407 /* Apply action to all signals except those used by the
3408 debugger. Silently skip those. */
3411 siglast
= nsigs
- 1;
3413 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3415 SET_SIGS (nsigs
, sigs
, signal_stop
);
3416 SET_SIGS (nsigs
, sigs
, signal_print
);
3418 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3420 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3422 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3424 SET_SIGS (nsigs
, sigs
, signal_print
);
3426 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3428 SET_SIGS (nsigs
, sigs
, signal_program
);
3430 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3432 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3434 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3436 SET_SIGS (nsigs
, sigs
, signal_program
);
3438 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3440 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3441 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3443 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3445 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3447 else if (digits
> 0)
3449 /* It is numeric. The numeric signal refers to our own
3450 internal signal numbering from target.h, not to host/target
3451 signal number. This is a feature; users really should be
3452 using symbolic names anyway, and the common ones like
3453 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3455 sigfirst
= siglast
= (int)
3456 target_signal_from_command (atoi (*argv
));
3457 if ((*argv
)[digits
] == '-')
3460 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3462 if (sigfirst
> siglast
)
3464 /* Bet he didn't figure we'd think of this case... */
3472 oursig
= target_signal_from_name (*argv
);
3473 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3475 sigfirst
= siglast
= (int) oursig
;
3479 /* Not a number and not a recognized flag word => complain. */
3480 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3484 /* If any signal numbers or symbol names were found, set flags for
3485 which signals to apply actions to. */
3487 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3489 switch ((enum target_signal
) signum
)
3491 case TARGET_SIGNAL_TRAP
:
3492 case TARGET_SIGNAL_INT
:
3493 if (!allsigs
&& !sigs
[signum
])
3495 if (query ("%s is used by the debugger.\n\
3496 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
3502 printf_unfiltered ("Not confirmed, unchanged.\n");
3503 gdb_flush (gdb_stdout
);
3507 case TARGET_SIGNAL_0
:
3508 case TARGET_SIGNAL_DEFAULT
:
3509 case TARGET_SIGNAL_UNKNOWN
:
3510 /* Make sure that "all" doesn't print these. */
3521 target_notice_signals (inferior_ptid
);
3525 /* Show the results. */
3526 sig_print_header ();
3527 for (signum
= 0; signum
< nsigs
; signum
++)
3531 sig_print_info (signum
);
3536 do_cleanups (old_chain
);
3540 xdb_handle_command (char *args
, int from_tty
)
3543 struct cleanup
*old_chain
;
3545 /* Break the command line up into args. */
3547 argv
= buildargv (args
);
3552 old_chain
= make_cleanup_freeargv (argv
);
3553 if (argv
[1] != (char *) NULL
)
3558 bufLen
= strlen (argv
[0]) + 20;
3559 argBuf
= (char *) xmalloc (bufLen
);
3563 enum target_signal oursig
;
3565 oursig
= target_signal_from_name (argv
[0]);
3566 memset (argBuf
, 0, bufLen
);
3567 if (strcmp (argv
[1], "Q") == 0)
3568 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3571 if (strcmp (argv
[1], "s") == 0)
3573 if (!signal_stop
[oursig
])
3574 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3576 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3578 else if (strcmp (argv
[1], "i") == 0)
3580 if (!signal_program
[oursig
])
3581 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3583 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3585 else if (strcmp (argv
[1], "r") == 0)
3587 if (!signal_print
[oursig
])
3588 sprintf (argBuf
, "%s %s", argv
[0], "print");
3590 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3596 handle_command (argBuf
, from_tty
);
3598 printf_filtered ("Invalid signal handling flag.\n");
3603 do_cleanups (old_chain
);
3606 /* Print current contents of the tables set by the handle command.
3607 It is possible we should just be printing signals actually used
3608 by the current target (but for things to work right when switching
3609 targets, all signals should be in the signal tables). */
3612 signals_info (char *signum_exp
, int from_tty
)
3614 enum target_signal oursig
;
3615 sig_print_header ();
3619 /* First see if this is a symbol name. */
3620 oursig
= target_signal_from_name (signum_exp
);
3621 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3623 /* No, try numeric. */
3625 target_signal_from_command (parse_and_eval_long (signum_exp
));
3627 sig_print_info (oursig
);
3631 printf_filtered ("\n");
3632 /* These ugly casts brought to you by the native VAX compiler. */
3633 for (oursig
= TARGET_SIGNAL_FIRST
;
3634 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3635 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3639 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3640 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
3641 sig_print_info (oursig
);
3644 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3647 struct inferior_status
3649 enum target_signal stop_signal
;
3653 int stop_stack_dummy
;
3654 int stopped_by_random_signal
;
3656 CORE_ADDR step_range_start
;
3657 CORE_ADDR step_range_end
;
3658 struct frame_id step_frame_id
;
3659 enum step_over_calls_kind step_over_calls
;
3660 CORE_ADDR step_resume_break_address
;
3661 int stop_after_trap
;
3663 struct regcache
*stop_registers
;
3665 /* These are here because if call_function_by_hand has written some
3666 registers and then decides to call error(), we better not have changed
3668 struct regcache
*registers
;
3670 /* A frame unique identifier. */
3671 struct frame_id selected_frame_id
;
3673 int breakpoint_proceeded
;
3674 int restore_stack_info
;
3675 int proceed_to_finish
;
3679 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3682 int size
= DEPRECATED_REGISTER_RAW_SIZE (regno
);
3683 void *buf
= alloca (size
);
3684 store_signed_integer (buf
, size
, val
);
3685 regcache_raw_write (inf_status
->registers
, regno
, buf
);
3688 /* Save all of the information associated with the inferior<==>gdb
3689 connection. INF_STATUS is a pointer to a "struct inferior_status"
3690 (defined in inferior.h). */
3692 struct inferior_status
*
3693 save_inferior_status (int restore_stack_info
)
3695 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
3697 inf_status
->stop_signal
= stop_signal
;
3698 inf_status
->stop_pc
= stop_pc
;
3699 inf_status
->stop_step
= stop_step
;
3700 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3701 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3702 inf_status
->trap_expected
= trap_expected
;
3703 inf_status
->step_range_start
= step_range_start
;
3704 inf_status
->step_range_end
= step_range_end
;
3705 inf_status
->step_frame_id
= step_frame_id
;
3706 inf_status
->step_over_calls
= step_over_calls
;
3707 inf_status
->stop_after_trap
= stop_after_trap
;
3708 inf_status
->stop_soon
= stop_soon
;
3709 /* Save original bpstat chain here; replace it with copy of chain.
3710 If caller's caller is walking the chain, they'll be happier if we
3711 hand them back the original chain when restore_inferior_status is
3713 inf_status
->stop_bpstat
= stop_bpstat
;
3714 stop_bpstat
= bpstat_copy (stop_bpstat
);
3715 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3716 inf_status
->restore_stack_info
= restore_stack_info
;
3717 inf_status
->proceed_to_finish
= proceed_to_finish
;
3719 inf_status
->stop_registers
= regcache_dup_no_passthrough (stop_registers
);
3721 inf_status
->registers
= regcache_dup (current_regcache
);
3723 inf_status
->selected_frame_id
= get_frame_id (deprecated_selected_frame
);
3728 restore_selected_frame (void *args
)
3730 struct frame_id
*fid
= (struct frame_id
*) args
;
3731 struct frame_info
*frame
;
3733 frame
= frame_find_by_id (*fid
);
3735 /* If inf_status->selected_frame_id is NULL, there was no previously
3739 warning ("Unable to restore previously selected frame.\n");
3743 select_frame (frame
);
3749 restore_inferior_status (struct inferior_status
*inf_status
)
3751 stop_signal
= inf_status
->stop_signal
;
3752 stop_pc
= inf_status
->stop_pc
;
3753 stop_step
= inf_status
->stop_step
;
3754 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3755 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3756 trap_expected
= inf_status
->trap_expected
;
3757 step_range_start
= inf_status
->step_range_start
;
3758 step_range_end
= inf_status
->step_range_end
;
3759 step_frame_id
= inf_status
->step_frame_id
;
3760 step_over_calls
= inf_status
->step_over_calls
;
3761 stop_after_trap
= inf_status
->stop_after_trap
;
3762 stop_soon
= inf_status
->stop_soon
;
3763 bpstat_clear (&stop_bpstat
);
3764 stop_bpstat
= inf_status
->stop_bpstat
;
3765 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3766 proceed_to_finish
= inf_status
->proceed_to_finish
;
3768 /* FIXME: Is the restore of stop_registers always needed. */
3769 regcache_xfree (stop_registers
);
3770 stop_registers
= inf_status
->stop_registers
;
3772 /* The inferior can be gone if the user types "print exit(0)"
3773 (and perhaps other times). */
3774 if (target_has_execution
)
3775 /* NB: The register write goes through to the target. */
3776 regcache_cpy (current_regcache
, inf_status
->registers
);
3777 regcache_xfree (inf_status
->registers
);
3779 /* FIXME: If we are being called after stopping in a function which
3780 is called from gdb, we should not be trying to restore the
3781 selected frame; it just prints a spurious error message (The
3782 message is useful, however, in detecting bugs in gdb (like if gdb
3783 clobbers the stack)). In fact, should we be restoring the
3784 inferior status at all in that case? . */
3786 if (target_has_stack
&& inf_status
->restore_stack_info
)
3788 /* The point of catch_errors is that if the stack is clobbered,
3789 walking the stack might encounter a garbage pointer and
3790 error() trying to dereference it. */
3792 (restore_selected_frame
, &inf_status
->selected_frame_id
,
3793 "Unable to restore previously selected frame:\n",
3794 RETURN_MASK_ERROR
) == 0)
3795 /* Error in restoring the selected frame. Select the innermost
3797 select_frame (get_current_frame ());
3805 do_restore_inferior_status_cleanup (void *sts
)
3807 restore_inferior_status (sts
);
3811 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
3813 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
3817 discard_inferior_status (struct inferior_status
*inf_status
)
3819 /* See save_inferior_status for info on stop_bpstat. */
3820 bpstat_clear (&inf_status
->stop_bpstat
);
3821 regcache_xfree (inf_status
->registers
);
3822 regcache_xfree (inf_status
->stop_registers
);
3827 inferior_has_forked (int pid
, int *child_pid
)
3829 struct target_waitstatus last
;
3832 get_last_target_status (&last_ptid
, &last
);
3834 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
3837 if (ptid_get_pid (last_ptid
) != pid
)
3840 *child_pid
= last
.value
.related_pid
;
3845 inferior_has_vforked (int pid
, int *child_pid
)
3847 struct target_waitstatus last
;
3850 get_last_target_status (&last_ptid
, &last
);
3852 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
3855 if (ptid_get_pid (last_ptid
) != pid
)
3858 *child_pid
= last
.value
.related_pid
;
3863 inferior_has_execd (int pid
, char **execd_pathname
)
3865 struct target_waitstatus last
;
3868 get_last_target_status (&last_ptid
, &last
);
3870 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
3873 if (ptid_get_pid (last_ptid
) != pid
)
3876 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
3880 /* Oft used ptids */
3882 ptid_t minus_one_ptid
;
3884 /* Create a ptid given the necessary PID, LWP, and TID components. */
3887 ptid_build (int pid
, long lwp
, long tid
)
3897 /* Create a ptid from just a pid. */
3900 pid_to_ptid (int pid
)
3902 return ptid_build (pid
, 0, 0);
3905 /* Fetch the pid (process id) component from a ptid. */
3908 ptid_get_pid (ptid_t ptid
)
3913 /* Fetch the lwp (lightweight process) component from a ptid. */
3916 ptid_get_lwp (ptid_t ptid
)
3921 /* Fetch the tid (thread id) component from a ptid. */
3924 ptid_get_tid (ptid_t ptid
)
3929 /* ptid_equal() is used to test equality of two ptids. */
3932 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
3934 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
3935 && ptid1
.tid
== ptid2
.tid
);
3938 /* restore_inferior_ptid() will be used by the cleanup machinery
3939 to restore the inferior_ptid value saved in a call to
3940 save_inferior_ptid(). */
3943 restore_inferior_ptid (void *arg
)
3945 ptid_t
*saved_ptid_ptr
= arg
;
3946 inferior_ptid
= *saved_ptid_ptr
;
3950 /* Save the value of inferior_ptid so that it may be restored by a
3951 later call to do_cleanups(). Returns the struct cleanup pointer
3952 needed for later doing the cleanup. */
3955 save_inferior_ptid (void)
3957 ptid_t
*saved_ptid_ptr
;
3959 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
3960 *saved_ptid_ptr
= inferior_ptid
;
3961 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
3968 stop_registers
= regcache_xmalloc (current_gdbarch
);
3972 _initialize_infrun (void)
3976 struct cmd_list_element
*c
;
3978 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers
);
3979 deprecated_register_gdbarch_swap (NULL
, 0, build_infrun
);
3981 add_info ("signals", signals_info
,
3982 "What debugger does when program gets various signals.\n\
3983 Specify a signal as argument to print info on that signal only.");
3984 add_info_alias ("handle", "signals", 0);
3986 add_com ("handle", class_run
, handle_command
,
3987 concat ("Specify how to handle a signal.\n\
3988 Args are signals and actions to apply to those signals.\n\
3989 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3990 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3991 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3992 The special arg \"all\" is recognized to mean all signals except those\n\
3993 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3994 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3995 Stop means reenter debugger if this signal happens (implies print).\n\
3996 Print means print a message if this signal happens.\n\
3997 Pass means let program see this signal; otherwise program doesn't know.\n\
3998 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3999 Pass and Stop may be combined.", NULL
));
4002 add_com ("lz", class_info
, signals_info
,
4003 "What debugger does when program gets various signals.\n\
4004 Specify a signal as argument to print info on that signal only.");
4005 add_com ("z", class_run
, xdb_handle_command
,
4006 concat ("Specify how to handle a signal.\n\
4007 Args are signals and actions to apply to those signals.\n\
4008 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4009 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4010 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4011 The special arg \"all\" is recognized to mean all signals except those\n\
4012 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
4013 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4014 nopass), \"Q\" (noprint)\n\
4015 Stop means reenter debugger if this signal happens (implies print).\n\
4016 Print means print a message if this signal happens.\n\
4017 Pass means let program see this signal; otherwise program doesn't know.\n\
4018 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4019 Pass and Stop may be combined.", NULL
));
4024 add_cmd ("stop", class_obscure
, not_just_help_class_command
, "There is no `stop' command, but you can set a hook on `stop'.\n\
4025 This allows you to set a list of commands to be run each time execution\n\
4026 of the program stops.", &cmdlist
);
4028 numsigs
= (int) TARGET_SIGNAL_LAST
;
4029 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4030 signal_print
= (unsigned char *)
4031 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4032 signal_program
= (unsigned char *)
4033 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4034 for (i
= 0; i
< numsigs
; i
++)
4037 signal_print
[i
] = 1;
4038 signal_program
[i
] = 1;
4041 /* Signals caused by debugger's own actions
4042 should not be given to the program afterwards. */
4043 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4044 signal_program
[TARGET_SIGNAL_INT
] = 0;
4046 /* Signals that are not errors should not normally enter the debugger. */
4047 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4048 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4049 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4050 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4051 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4052 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4053 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4054 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4055 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4056 signal_print
[TARGET_SIGNAL_IO
] = 0;
4057 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4058 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4059 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4060 signal_print
[TARGET_SIGNAL_URG
] = 0;
4061 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4062 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4064 /* These signals are used internally by user-level thread
4065 implementations. (See signal(5) on Solaris.) Like the above
4066 signals, a healthy program receives and handles them as part of
4067 its normal operation. */
4068 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4069 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4070 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4071 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4072 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4073 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4077 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
4078 (char *) &stop_on_solib_events
,
4079 "Set stopping for shared library events.\n\
4080 If nonzero, gdb will give control to the user when the dynamic linker\n\
4081 notifies gdb of shared library events. The most common event of interest\n\
4082 to the user would be loading/unloading of a new library.\n", &setlist
), &showlist
);
4085 c
= add_set_enum_cmd ("follow-fork-mode",
4087 follow_fork_mode_kind_names
, &follow_fork_mode_string
,
4088 "Set debugger response to a program call of fork \
4090 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4091 parent - the original process is debugged after a fork\n\
4092 child - the new process is debugged after a fork\n\
4093 The unfollowed process will continue to run.\n\
4094 By default, the debugger will follow the parent process.", &setlist
);
4095 add_show_from_set (c
, &showlist
);
4097 c
= add_set_enum_cmd ("scheduler-locking", class_run
, scheduler_enums
, /* array of string names */
4098 &scheduler_mode
, /* current mode */
4099 "Set mode for locking scheduler during execution.\n\
4100 off == no locking (threads may preempt at any time)\n\
4101 on == full locking (no thread except the current thread may run)\n\
4102 step == scheduler locked during every single-step operation.\n\
4103 In this mode, no other thread may run during a step command.\n\
4104 Other threads may run while stepping over a function call ('next').", &setlist
);
4106 set_cmd_sfunc (c
, set_schedlock_func
); /* traps on target vector */
4107 add_show_from_set (c
, &showlist
);
4109 c
= add_set_cmd ("step-mode", class_run
,
4110 var_boolean
, (char *) &step_stop_if_no_debug
,
4111 "Set mode of the step operation. When set, doing a step over a\n\
4112 function without debug line information will stop at the first\n\
4113 instruction of that function. Otherwise, the function is skipped and\n\
4114 the step command stops at a different source line.", &setlist
);
4115 add_show_from_set (c
, &showlist
);
4117 /* ptid initializations */
4118 null_ptid
= ptid_build (0, 0, 0);
4119 minus_one_ptid
= ptid_build (-1, 0, 0);
4120 inferior_ptid
= null_ptid
;
4121 target_last_wait_ptid
= minus_one_ptid
;