1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
6 2008, 2009 Free 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 3 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, see <http://www.gnu.org/licenses/>. */
24 #include "gdb_string.h"
29 #include "exceptions.h"
30 #include "breakpoint.h"
34 #include "cli/cli-script.h"
36 #include "gdbthread.h"
48 #include "gdb_assert.h"
49 #include "mi/mi-common.h"
50 #include "event-top.h"
52 /* Prototypes for local functions */
54 static void signals_info (char *, int);
56 static void handle_command (char *, int);
58 static void sig_print_info (enum target_signal
);
60 static void sig_print_header (void);
62 static void resume_cleanups (void *);
64 static int hook_stop_stub (void *);
66 static int restore_selected_frame (void *);
68 static void build_infrun (void);
70 static int follow_fork (void);
72 static void set_schedlock_func (char *args
, int from_tty
,
73 struct cmd_list_element
*c
);
75 static int currently_stepping (struct thread_info
*tp
);
77 static int currently_stepping_callback (struct thread_info
*tp
, void *data
);
79 static void xdb_handle_command (char *args
, int from_tty
);
81 static int prepare_to_proceed (int);
83 void _initialize_infrun (void);
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug
= 0;
90 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
91 struct cmd_list_element
*c
, const char *value
)
93 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
96 /* In asynchronous mode, but simulating synchronous execution. */
98 int sync_execution
= 0;
100 /* wait_for_inferior and normal_stop use this to notify the user
101 when the inferior stopped in a different thread than it had been
104 static ptid_t previous_inferior_ptid
;
106 int debug_displaced
= 0;
108 show_debug_displaced (struct ui_file
*file
, int from_tty
,
109 struct cmd_list_element
*c
, const char *value
)
111 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
114 static int debug_infrun
= 0;
116 show_debug_infrun (struct ui_file
*file
, int from_tty
,
117 struct cmd_list_element
*c
, const char *value
)
119 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
122 /* If the program uses ELF-style shared libraries, then calls to
123 functions in shared libraries go through stubs, which live in a
124 table called the PLT (Procedure Linkage Table). The first time the
125 function is called, the stub sends control to the dynamic linker,
126 which looks up the function's real address, patches the stub so
127 that future calls will go directly to the function, and then passes
128 control to the function.
130 If we are stepping at the source level, we don't want to see any of
131 this --- we just want to skip over the stub and the dynamic linker.
132 The simple approach is to single-step until control leaves the
135 However, on some systems (e.g., Red Hat's 5.2 distribution) the
136 dynamic linker calls functions in the shared C library, so you
137 can't tell from the PC alone whether the dynamic linker is still
138 running. In this case, we use a step-resume breakpoint to get us
139 past the dynamic linker, as if we were using "next" to step over a
142 in_solib_dynsym_resolve_code() says whether we're in the dynamic
143 linker code or not. Normally, this means we single-step. However,
144 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
145 address where we can place a step-resume breakpoint to get past the
146 linker's symbol resolution function.
148 in_solib_dynsym_resolve_code() can generally be implemented in a
149 pretty portable way, by comparing the PC against the address ranges
150 of the dynamic linker's sections.
152 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
153 it depends on internal details of the dynamic linker. It's usually
154 not too hard to figure out where to put a breakpoint, but it
155 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
156 sanity checking. If it can't figure things out, returning zero and
157 getting the (possibly confusing) stepping behavior is better than
158 signalling an error, which will obscure the change in the
161 /* This function returns TRUE if pc is the address of an instruction
162 that lies within the dynamic linker (such as the event hook, or the
165 This function must be used only when a dynamic linker event has
166 been caught, and the inferior is being stepped out of the hook, or
167 undefined results are guaranteed. */
169 #ifndef SOLIB_IN_DYNAMIC_LINKER
170 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
174 /* Convert the #defines into values. This is temporary until wfi control
175 flow is completely sorted out. */
177 #ifndef CANNOT_STEP_HW_WATCHPOINTS
178 #define CANNOT_STEP_HW_WATCHPOINTS 0
180 #undef CANNOT_STEP_HW_WATCHPOINTS
181 #define CANNOT_STEP_HW_WATCHPOINTS 1
184 /* Tables of how to react to signals; the user sets them. */
186 static unsigned char *signal_stop
;
187 static unsigned char *signal_print
;
188 static unsigned char *signal_program
;
190 #define SET_SIGS(nsigs,sigs,flags) \
192 int signum = (nsigs); \
193 while (signum-- > 0) \
194 if ((sigs)[signum]) \
195 (flags)[signum] = 1; \
198 #define UNSET_SIGS(nsigs,sigs,flags) \
200 int signum = (nsigs); \
201 while (signum-- > 0) \
202 if ((sigs)[signum]) \
203 (flags)[signum] = 0; \
206 /* Value to pass to target_resume() to cause all threads to resume */
208 #define RESUME_ALL (pid_to_ptid (-1))
210 /* Command list pointer for the "stop" placeholder. */
212 static struct cmd_list_element
*stop_command
;
214 /* Function inferior was in as of last step command. */
216 static struct symbol
*step_start_function
;
218 /* Nonzero if we want to give control to the user when we're notified
219 of shared library events by the dynamic linker. */
220 static int stop_on_solib_events
;
222 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
223 struct cmd_list_element
*c
, const char *value
)
225 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
229 /* Nonzero means expecting a trace trap
230 and should stop the inferior and return silently when it happens. */
234 /* Save register contents here when executing a "finish" command or are
235 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
236 Thus this contains the return value from the called function (assuming
237 values are returned in a register). */
239 struct regcache
*stop_registers
;
241 /* Nonzero after stop if current stack frame should be printed. */
243 static int stop_print_frame
;
245 /* This is a cached copy of the pid/waitstatus of the last event
246 returned by target_wait()/deprecated_target_wait_hook(). This
247 information is returned by get_last_target_status(). */
248 static ptid_t target_last_wait_ptid
;
249 static struct target_waitstatus target_last_waitstatus
;
251 static void context_switch (ptid_t ptid
);
253 void init_thread_stepping_state (struct thread_info
*tss
);
255 void init_infwait_state (void);
257 /* This is used to remember when a fork, vfork or exec event
258 was caught by a catchpoint, and thus the event is to be
259 followed at the next resume of the inferior, and not
263 enum target_waitkind kind
;
270 char *execd_pathname
;
274 static const char follow_fork_mode_child
[] = "child";
275 static const char follow_fork_mode_parent
[] = "parent";
277 static const char *follow_fork_mode_kind_names
[] = {
278 follow_fork_mode_child
,
279 follow_fork_mode_parent
,
283 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
285 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
286 struct cmd_list_element
*c
, const char *value
)
288 fprintf_filtered (file
, _("\
289 Debugger response to a program call of fork or vfork is \"%s\".\n"),
297 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
299 return target_follow_fork (follow_child
);
303 follow_inferior_reset_breakpoints (void)
305 struct thread_info
*tp
= inferior_thread ();
307 /* Was there a step_resume breakpoint? (There was if the user
308 did a "next" at the fork() call.) If so, explicitly reset its
311 step_resumes are a form of bp that are made to be per-thread.
312 Since we created the step_resume bp when the parent process
313 was being debugged, and now are switching to the child process,
314 from the breakpoint package's viewpoint, that's a switch of
315 "threads". We must update the bp's notion of which thread
316 it is for, or it'll be ignored when it triggers. */
318 if (tp
->step_resume_breakpoint
)
319 breakpoint_re_set_thread (tp
->step_resume_breakpoint
);
321 /* Reinsert all breakpoints in the child. The user may have set
322 breakpoints after catching the fork, in which case those
323 were never set in the child, but only in the parent. This makes
324 sure the inserted breakpoints match the breakpoint list. */
326 breakpoint_re_set ();
327 insert_breakpoints ();
330 /* EXECD_PATHNAME is assumed to be non-NULL. */
333 follow_exec (ptid_t pid
, char *execd_pathname
)
335 struct target_ops
*tgt
;
336 struct thread_info
*th
= inferior_thread ();
338 /* This is an exec event that we actually wish to pay attention to.
339 Refresh our symbol table to the newly exec'd program, remove any
342 If there are breakpoints, they aren't really inserted now,
343 since the exec() transformed our inferior into a fresh set
346 We want to preserve symbolic breakpoints on the list, since
347 we have hopes that they can be reset after the new a.out's
348 symbol table is read.
350 However, any "raw" breakpoints must be removed from the list
351 (e.g., the solib bp's), since their address is probably invalid
354 And, we DON'T want to call delete_breakpoints() here, since
355 that may write the bp's "shadow contents" (the instruction
356 value that was overwritten witha TRAP instruction). Since
357 we now have a new a.out, those shadow contents aren't valid. */
358 update_breakpoints_after_exec ();
360 /* If there was one, it's gone now. We cannot truly step-to-next
361 statement through an exec(). */
362 th
->step_resume_breakpoint
= NULL
;
363 th
->step_range_start
= 0;
364 th
->step_range_end
= 0;
366 /* What is this a.out's name? */
367 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
369 /* We've followed the inferior through an exec. Therefore, the
370 inferior has essentially been killed & reborn. */
372 gdb_flush (gdb_stdout
);
374 breakpoint_init_inferior (inf_execd
);
376 if (gdb_sysroot
&& *gdb_sysroot
)
378 char *name
= alloca (strlen (gdb_sysroot
)
379 + strlen (execd_pathname
)
381 strcpy (name
, gdb_sysroot
);
382 strcat (name
, execd_pathname
);
383 execd_pathname
= name
;
386 /* That a.out is now the one to use. */
387 exec_file_attach (execd_pathname
, 0);
389 /* Reset the shared library package. This ensures that we get a
390 shlib event when the child reaches "_start", at which point the
391 dld will have had a chance to initialize the child. */
392 /* Also, loading a symbol file below may trigger symbol lookups, and
393 we don't want those to be satisfied by the libraries of the
394 previous incarnation of this process. */
395 no_shared_libraries (NULL
, 0);
397 /* Load the main file's symbols. */
398 symbol_file_add_main (execd_pathname
, 0);
400 #ifdef SOLIB_CREATE_INFERIOR_HOOK
401 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
403 solib_create_inferior_hook ();
406 /* Reinsert all breakpoints. (Those which were symbolic have
407 been reset to the proper address in the new a.out, thanks
408 to symbol_file_command...) */
409 insert_breakpoints ();
411 /* The next resume of this inferior should bring it to the shlib
412 startup breakpoints. (If the user had also set bp's on
413 "main" from the old (parent) process, then they'll auto-
414 matically get reset there in the new process.) */
417 /* Non-zero if we just simulating a single-step. This is needed
418 because we cannot remove the breakpoints in the inferior process
419 until after the `wait' in `wait_for_inferior'. */
420 static int singlestep_breakpoints_inserted_p
= 0;
422 /* The thread we inserted single-step breakpoints for. */
423 static ptid_t singlestep_ptid
;
425 /* PC when we started this single-step. */
426 static CORE_ADDR singlestep_pc
;
428 /* If another thread hit the singlestep breakpoint, we save the original
429 thread here so that we can resume single-stepping it later. */
430 static ptid_t saved_singlestep_ptid
;
431 static int stepping_past_singlestep_breakpoint
;
433 /* If not equal to null_ptid, this means that after stepping over breakpoint
434 is finished, we need to switch to deferred_step_ptid, and step it.
436 The use case is when one thread has hit a breakpoint, and then the user
437 has switched to another thread and issued 'step'. We need to step over
438 breakpoint in the thread which hit the breakpoint, but then continue
439 stepping the thread user has selected. */
440 static ptid_t deferred_step_ptid
;
442 /* Displaced stepping. */
444 /* In non-stop debugging mode, we must take special care to manage
445 breakpoints properly; in particular, the traditional strategy for
446 stepping a thread past a breakpoint it has hit is unsuitable.
447 'Displaced stepping' is a tactic for stepping one thread past a
448 breakpoint it has hit while ensuring that other threads running
449 concurrently will hit the breakpoint as they should.
451 The traditional way to step a thread T off a breakpoint in a
452 multi-threaded program in all-stop mode is as follows:
454 a0) Initially, all threads are stopped, and breakpoints are not
456 a1) We single-step T, leaving breakpoints uninserted.
457 a2) We insert breakpoints, and resume all threads.
459 In non-stop debugging, however, this strategy is unsuitable: we
460 don't want to have to stop all threads in the system in order to
461 continue or step T past a breakpoint. Instead, we use displaced
464 n0) Initially, T is stopped, other threads are running, and
465 breakpoints are inserted.
466 n1) We copy the instruction "under" the breakpoint to a separate
467 location, outside the main code stream, making any adjustments
468 to the instruction, register, and memory state as directed by
470 n2) We single-step T over the instruction at its new location.
471 n3) We adjust the resulting register and memory state as directed
472 by T's architecture. This includes resetting T's PC to point
473 back into the main instruction stream.
476 This approach depends on the following gdbarch methods:
478 - gdbarch_max_insn_length and gdbarch_displaced_step_location
479 indicate where to copy the instruction, and how much space must
480 be reserved there. We use these in step n1.
482 - gdbarch_displaced_step_copy_insn copies a instruction to a new
483 address, and makes any necessary adjustments to the instruction,
484 register contents, and memory. We use this in step n1.
486 - gdbarch_displaced_step_fixup adjusts registers and memory after
487 we have successfuly single-stepped the instruction, to yield the
488 same effect the instruction would have had if we had executed it
489 at its original address. We use this in step n3.
491 - gdbarch_displaced_step_free_closure provides cleanup.
493 The gdbarch_displaced_step_copy_insn and
494 gdbarch_displaced_step_fixup functions must be written so that
495 copying an instruction with gdbarch_displaced_step_copy_insn,
496 single-stepping across the copied instruction, and then applying
497 gdbarch_displaced_insn_fixup should have the same effects on the
498 thread's memory and registers as stepping the instruction in place
499 would have. Exactly which responsibilities fall to the copy and
500 which fall to the fixup is up to the author of those functions.
502 See the comments in gdbarch.sh for details.
504 Note that displaced stepping and software single-step cannot
505 currently be used in combination, although with some care I think
506 they could be made to. Software single-step works by placing
507 breakpoints on all possible subsequent instructions; if the
508 displaced instruction is a PC-relative jump, those breakpoints
509 could fall in very strange places --- on pages that aren't
510 executable, or at addresses that are not proper instruction
511 boundaries. (We do generally let other threads run while we wait
512 to hit the software single-step breakpoint, and they might
513 encounter such a corrupted instruction.) One way to work around
514 this would be to have gdbarch_displaced_step_copy_insn fully
515 simulate the effect of PC-relative instructions (and return NULL)
516 on architectures that use software single-stepping.
518 In non-stop mode, we can have independent and simultaneous step
519 requests, so more than one thread may need to simultaneously step
520 over a breakpoint. The current implementation assumes there is
521 only one scratch space per process. In this case, we have to
522 serialize access to the scratch space. If thread A wants to step
523 over a breakpoint, but we are currently waiting for some other
524 thread to complete a displaced step, we leave thread A stopped and
525 place it in the displaced_step_request_queue. Whenever a displaced
526 step finishes, we pick the next thread in the queue and start a new
527 displaced step operation on it. See displaced_step_prepare and
528 displaced_step_fixup for details. */
530 /* If this is not null_ptid, this is the thread carrying out a
531 displaced single-step. This thread's state will require fixing up
532 once it has completed its step. */
533 static ptid_t displaced_step_ptid
;
535 struct displaced_step_request
538 struct displaced_step_request
*next
;
541 /* A queue of pending displaced stepping requests. */
542 struct displaced_step_request
*displaced_step_request_queue
;
544 /* The architecture the thread had when we stepped it. */
545 static struct gdbarch
*displaced_step_gdbarch
;
547 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
548 for post-step cleanup. */
549 static struct displaced_step_closure
*displaced_step_closure
;
551 /* The address of the original instruction, and the copy we made. */
552 static CORE_ADDR displaced_step_original
, displaced_step_copy
;
554 /* Saved contents of copy area. */
555 static gdb_byte
*displaced_step_saved_copy
;
557 /* Enum strings for "set|show displaced-stepping". */
559 static const char can_use_displaced_stepping_auto
[] = "auto";
560 static const char can_use_displaced_stepping_on
[] = "on";
561 static const char can_use_displaced_stepping_off
[] = "off";
562 static const char *can_use_displaced_stepping_enum
[] =
564 can_use_displaced_stepping_auto
,
565 can_use_displaced_stepping_on
,
566 can_use_displaced_stepping_off
,
570 /* If ON, and the architecture supports it, GDB will use displaced
571 stepping to step over breakpoints. If OFF, or if the architecture
572 doesn't support it, GDB will instead use the traditional
573 hold-and-step approach. If AUTO (which is the default), GDB will
574 decide which technique to use to step over breakpoints depending on
575 which of all-stop or non-stop mode is active --- displaced stepping
576 in non-stop mode; hold-and-step in all-stop mode. */
578 static const char *can_use_displaced_stepping
=
579 can_use_displaced_stepping_auto
;
582 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
583 struct cmd_list_element
*c
,
586 if (can_use_displaced_stepping
== can_use_displaced_stepping_auto
)
587 fprintf_filtered (file
, _("\
588 Debugger's willingness to use displaced stepping to step over \
589 breakpoints is %s (currently %s).\n"),
590 value
, non_stop
? "on" : "off");
592 fprintf_filtered (file
, _("\
593 Debugger's willingness to use displaced stepping to step over \
594 breakpoints is %s.\n"), value
);
597 /* Return non-zero if displaced stepping can/should be used to step
601 use_displaced_stepping (struct gdbarch
*gdbarch
)
603 return (((can_use_displaced_stepping
== can_use_displaced_stepping_auto
605 || can_use_displaced_stepping
== can_use_displaced_stepping_on
)
606 && gdbarch_displaced_step_copy_insn_p (gdbarch
));
609 /* Clean out any stray displaced stepping state. */
611 displaced_step_clear (void)
613 /* Indicate that there is no cleanup pending. */
614 displaced_step_ptid
= null_ptid
;
616 if (displaced_step_closure
)
618 gdbarch_displaced_step_free_closure (displaced_step_gdbarch
,
619 displaced_step_closure
);
620 displaced_step_closure
= NULL
;
625 cleanup_displaced_step_closure (void *ptr
)
627 struct displaced_step_closure
*closure
= ptr
;
629 gdbarch_displaced_step_free_closure (current_gdbarch
, closure
);
632 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
634 displaced_step_dump_bytes (struct ui_file
*file
,
640 for (i
= 0; i
< len
; i
++)
641 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
642 fputs_unfiltered ("\n", file
);
645 /* Prepare to single-step, using displaced stepping.
647 Note that we cannot use displaced stepping when we have a signal to
648 deliver. If we have a signal to deliver and an instruction to step
649 over, then after the step, there will be no indication from the
650 target whether the thread entered a signal handler or ignored the
651 signal and stepped over the instruction successfully --- both cases
652 result in a simple SIGTRAP. In the first case we mustn't do a
653 fixup, and in the second case we must --- but we can't tell which.
654 Comments in the code for 'random signals' in handle_inferior_event
655 explain how we handle this case instead.
657 Returns 1 if preparing was successful -- this thread is going to be
658 stepped now; or 0 if displaced stepping this thread got queued. */
660 displaced_step_prepare (ptid_t ptid
)
662 struct cleanup
*old_cleanups
, *ignore_cleanups
;
663 struct regcache
*regcache
= get_thread_regcache (ptid
);
664 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
665 CORE_ADDR original
, copy
;
667 struct displaced_step_closure
*closure
;
669 /* We should never reach this function if the architecture does not
670 support displaced stepping. */
671 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
673 /* For the first cut, we're displaced stepping one thread at a
676 if (!ptid_equal (displaced_step_ptid
, null_ptid
))
678 /* Already waiting for a displaced step to finish. Defer this
679 request and place in queue. */
680 struct displaced_step_request
*req
, *new_req
;
683 fprintf_unfiltered (gdb_stdlog
,
684 "displaced: defering step of %s\n",
685 target_pid_to_str (ptid
));
687 new_req
= xmalloc (sizeof (*new_req
));
688 new_req
->ptid
= ptid
;
689 new_req
->next
= NULL
;
691 if (displaced_step_request_queue
)
693 for (req
= displaced_step_request_queue
;
700 displaced_step_request_queue
= new_req
;
707 fprintf_unfiltered (gdb_stdlog
,
708 "displaced: stepping %s now\n",
709 target_pid_to_str (ptid
));
712 displaced_step_clear ();
714 old_cleanups
= save_inferior_ptid ();
715 inferior_ptid
= ptid
;
717 original
= regcache_read_pc (regcache
);
719 copy
= gdbarch_displaced_step_location (gdbarch
);
720 len
= gdbarch_max_insn_length (gdbarch
);
722 /* Save the original contents of the copy area. */
723 displaced_step_saved_copy
= xmalloc (len
);
724 ignore_cleanups
= make_cleanup (free_current_contents
,
725 &displaced_step_saved_copy
);
726 read_memory (copy
, displaced_step_saved_copy
, len
);
729 fprintf_unfiltered (gdb_stdlog
, "displaced: saved 0x%s: ",
731 displaced_step_dump_bytes (gdb_stdlog
, displaced_step_saved_copy
, len
);
734 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
735 original
, copy
, regcache
);
737 /* We don't support the fully-simulated case at present. */
738 gdb_assert (closure
);
740 make_cleanup (cleanup_displaced_step_closure
, closure
);
742 /* Resume execution at the copy. */
743 regcache_write_pc (regcache
, copy
);
745 discard_cleanups (ignore_cleanups
);
747 do_cleanups (old_cleanups
);
750 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to 0x%s\n",
753 /* Save the information we need to fix things up if the step
755 displaced_step_ptid
= ptid
;
756 displaced_step_gdbarch
= gdbarch
;
757 displaced_step_closure
= closure
;
758 displaced_step_original
= original
;
759 displaced_step_copy
= copy
;
764 displaced_step_clear_cleanup (void *ignore
)
766 displaced_step_clear ();
770 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
, const gdb_byte
*myaddr
, int len
)
772 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
773 inferior_ptid
= ptid
;
774 write_memory (memaddr
, myaddr
, len
);
775 do_cleanups (ptid_cleanup
);
779 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
781 struct cleanup
*old_cleanups
;
783 /* Was this event for the pid we displaced? */
784 if (ptid_equal (displaced_step_ptid
, null_ptid
)
785 || ! ptid_equal (displaced_step_ptid
, event_ptid
))
788 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, 0);
790 /* Restore the contents of the copy area. */
792 ULONGEST len
= gdbarch_max_insn_length (displaced_step_gdbarch
);
793 write_memory_ptid (displaced_step_ptid
, displaced_step_copy
,
794 displaced_step_saved_copy
, len
);
796 fprintf_unfiltered (gdb_stdlog
, "displaced: restored 0x%s\n",
797 paddr_nz (displaced_step_copy
));
800 /* Did the instruction complete successfully? */
801 if (signal
== TARGET_SIGNAL_TRAP
)
803 /* Fix up the resulting state. */
804 gdbarch_displaced_step_fixup (displaced_step_gdbarch
,
805 displaced_step_closure
,
806 displaced_step_original
,
808 get_thread_regcache (displaced_step_ptid
));
812 /* Since the instruction didn't complete, all we can do is
814 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
815 CORE_ADDR pc
= regcache_read_pc (regcache
);
816 pc
= displaced_step_original
+ (pc
- displaced_step_copy
);
817 regcache_write_pc (regcache
, pc
);
820 do_cleanups (old_cleanups
);
822 displaced_step_ptid
= null_ptid
;
824 /* Are there any pending displaced stepping requests? If so, run
826 while (displaced_step_request_queue
)
828 struct displaced_step_request
*head
;
832 head
= displaced_step_request_queue
;
834 displaced_step_request_queue
= head
->next
;
837 context_switch (ptid
);
839 actual_pc
= read_pc ();
841 if (breakpoint_here_p (actual_pc
))
844 fprintf_unfiltered (gdb_stdlog
,
845 "displaced: stepping queued %s now\n",
846 target_pid_to_str (ptid
));
848 displaced_step_prepare (ptid
);
854 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
855 paddr_nz (actual_pc
));
856 read_memory (actual_pc
, buf
, sizeof (buf
));
857 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
860 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
862 /* Done, we're stepping a thread. */
868 struct thread_info
*tp
= inferior_thread ();
870 /* The breakpoint we were sitting under has since been
872 tp
->trap_expected
= 0;
874 /* Go back to what we were trying to do. */
875 step
= currently_stepping (tp
);
878 fprintf_unfiltered (gdb_stdlog
, "breakpoint is gone %s: step(%d)\n",
879 target_pid_to_str (tp
->ptid
), step
);
881 target_resume (ptid
, step
, TARGET_SIGNAL_0
);
882 tp
->stop_signal
= TARGET_SIGNAL_0
;
884 /* This request was discarded. See if there's any other
885 thread waiting for its turn. */
890 /* Update global variables holding ptids to hold NEW_PTID if they were
893 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
895 struct displaced_step_request
*it
;
897 if (ptid_equal (inferior_ptid
, old_ptid
))
898 inferior_ptid
= new_ptid
;
900 if (ptid_equal (singlestep_ptid
, old_ptid
))
901 singlestep_ptid
= new_ptid
;
903 if (ptid_equal (displaced_step_ptid
, old_ptid
))
904 displaced_step_ptid
= new_ptid
;
906 if (ptid_equal (deferred_step_ptid
, old_ptid
))
907 deferred_step_ptid
= new_ptid
;
909 for (it
= displaced_step_request_queue
; it
; it
= it
->next
)
910 if (ptid_equal (it
->ptid
, old_ptid
))
917 /* Things to clean up if we QUIT out of resume (). */
919 resume_cleanups (void *ignore
)
924 static const char schedlock_off
[] = "off";
925 static const char schedlock_on
[] = "on";
926 static const char schedlock_step
[] = "step";
927 static const char *scheduler_enums
[] = {
933 static const char *scheduler_mode
= schedlock_off
;
935 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
936 struct cmd_list_element
*c
, const char *value
)
938 fprintf_filtered (file
, _("\
939 Mode for locking scheduler during execution is \"%s\".\n"),
944 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
946 if (!target_can_lock_scheduler
)
948 scheduler_mode
= schedlock_off
;
949 error (_("Target '%s' cannot support this command."), target_shortname
);
954 /* Resume the inferior, but allow a QUIT. This is useful if the user
955 wants to interrupt some lengthy single-stepping operation
956 (for child processes, the SIGINT goes to the inferior, and so
957 we get a SIGINT random_signal, but for remote debugging and perhaps
958 other targets, that's not true).
960 STEP nonzero if we should step (zero to continue instead).
961 SIG is the signal to give the inferior (zero for none). */
963 resume (int step
, enum target_signal sig
)
965 int should_resume
= 1;
966 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
968 /* Note that these must be reset if we follow a fork below. */
969 struct regcache
*regcache
= get_current_regcache ();
970 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
971 struct thread_info
*tp
= inferior_thread ();
972 CORE_ADDR pc
= regcache_read_pc (regcache
);
977 fprintf_unfiltered (gdb_stdlog
,
978 "infrun: resume (step=%d, signal=%d), "
979 "trap_expected=%d\n",
980 step
, sig
, tp
->trap_expected
);
982 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
983 over an instruction that causes a page fault without triggering
984 a hardware watchpoint. The kernel properly notices that it shouldn't
985 stop, because the hardware watchpoint is not triggered, but it forgets
986 the step request and continues the program normally.
987 Work around the problem by removing hardware watchpoints if a step is
988 requested, GDB will check for a hardware watchpoint trigger after the
990 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
991 remove_hw_watchpoints ();
994 /* Normally, by the time we reach `resume', the breakpoints are either
995 removed or inserted, as appropriate. The exception is if we're sitting
996 at a permanent breakpoint; we need to step over it, but permanent
997 breakpoints can't be removed. So we have to test for it here. */
998 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
1000 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1001 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1004 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1005 how to step past a permanent breakpoint on this architecture. Try using\n\
1006 a command like `return' or `jump' to continue execution."));
1009 /* If enabled, step over breakpoints by executing a copy of the
1010 instruction at a different address.
1012 We can't use displaced stepping when we have a signal to deliver;
1013 the comments for displaced_step_prepare explain why. The
1014 comments in the handle_inferior event for dealing with 'random
1015 signals' explain what we do instead. */
1016 if (use_displaced_stepping (gdbarch
)
1017 && tp
->trap_expected
1018 && sig
== TARGET_SIGNAL_0
)
1020 if (!displaced_step_prepare (inferior_ptid
))
1022 /* Got placed in displaced stepping queue. Will be resumed
1023 later when all the currently queued displaced stepping
1024 requests finish. The thread is not executing at this point,
1025 and the call to set_executing will be made later. But we
1026 need to call set_running here, since from frontend point of view,
1027 the thread is running. */
1028 set_running (inferior_ptid
, 1);
1029 discard_cleanups (old_cleanups
);
1034 if (step
&& gdbarch_software_single_step_p (gdbarch
))
1036 /* Do it the hard way, w/temp breakpoints */
1037 if (gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1039 /* ...and don't ask hardware to do it. */
1041 /* and do not pull these breakpoints until after a `wait' in
1042 `wait_for_inferior' */
1043 singlestep_breakpoints_inserted_p
= 1;
1044 singlestep_ptid
= inferior_ptid
;
1049 /* If there were any forks/vforks/execs that were caught and are
1050 now to be followed, then do so. */
1051 switch (pending_follow
.kind
)
1053 case TARGET_WAITKIND_FORKED
:
1054 case TARGET_WAITKIND_VFORKED
:
1055 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1059 /* Following a child fork will change our notion of current
1061 tp
= inferior_thread ();
1062 regcache
= get_current_regcache ();
1063 gdbarch
= get_regcache_arch (regcache
);
1064 pc
= regcache_read_pc (regcache
);
1067 case TARGET_WAITKIND_EXECD
:
1068 /* follow_exec is called as soon as the exec event is seen. */
1069 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1076 /* Install inferior's terminal modes. */
1077 target_terminal_inferior ();
1083 resume_ptid
= RESUME_ALL
; /* Default */
1085 /* If STEP is set, it's a request to use hardware stepping
1086 facilities. But in that case, we should never
1087 use singlestep breakpoint. */
1088 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1090 if (singlestep_breakpoints_inserted_p
1091 && stepping_past_singlestep_breakpoint
)
1093 /* The situation here is as follows. In thread T1 we wanted to
1094 single-step. Lacking hardware single-stepping we've
1095 set breakpoint at the PC of the next instruction -- call it
1096 P. After resuming, we've hit that breakpoint in thread T2.
1097 Now we've removed original breakpoint, inserted breakpoint
1098 at P+1, and try to step to advance T2 past breakpoint.
1099 We need to step only T2, as if T1 is allowed to freely run,
1100 it can run past P, and if other threads are allowed to run,
1101 they can hit breakpoint at P+1, and nested hits of single-step
1102 breakpoints is not something we'd want -- that's complicated
1103 to support, and has no value. */
1104 resume_ptid
= inferior_ptid
;
1107 if ((step
|| singlestep_breakpoints_inserted_p
)
1108 && tp
->trap_expected
)
1110 /* We're allowing a thread to run past a breakpoint it has
1111 hit, by single-stepping the thread with the breakpoint
1112 removed. In which case, we need to single-step only this
1113 thread, and keep others stopped, as they can miss this
1114 breakpoint if allowed to run.
1116 The current code actually removes all breakpoints when
1117 doing this, not just the one being stepped over, so if we
1118 let other threads run, we can actually miss any
1119 breakpoint, not just the one at PC. */
1120 resume_ptid
= inferior_ptid
;
1125 /* With non-stop mode on, threads are always handled
1127 resume_ptid
= inferior_ptid
;
1129 else if ((scheduler_mode
== schedlock_on
)
1130 || (scheduler_mode
== schedlock_step
1131 && (step
|| singlestep_breakpoints_inserted_p
)))
1133 /* User-settable 'scheduler' mode requires solo thread resume. */
1134 resume_ptid
= inferior_ptid
;
1137 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1139 /* Most targets can step a breakpoint instruction, thus
1140 executing it normally. But if this one cannot, just
1141 continue and we will hit it anyway. */
1142 if (step
&& breakpoint_inserted_here_p (pc
))
1147 && use_displaced_stepping (gdbarch
)
1148 && tp
->trap_expected
)
1150 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1151 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1154 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1155 paddr_nz (actual_pc
));
1156 read_memory (actual_pc
, buf
, sizeof (buf
));
1157 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1160 /* Avoid confusing the next resume, if the next stop/resume
1161 happens to apply to another thread. */
1162 tp
->stop_signal
= TARGET_SIGNAL_0
;
1164 target_resume (resume_ptid
, step
, sig
);
1167 discard_cleanups (old_cleanups
);
1172 /* Clear out all variables saying what to do when inferior is continued.
1173 First do this, then set the ones you want, then call `proceed'. */
1176 clear_proceed_status_thread (struct thread_info
*tp
)
1179 fprintf_unfiltered (gdb_stdlog
,
1180 "infrun: clear_proceed_status_thread (%s)\n",
1181 target_pid_to_str (tp
->ptid
));
1183 tp
->trap_expected
= 0;
1184 tp
->step_range_start
= 0;
1185 tp
->step_range_end
= 0;
1186 tp
->step_frame_id
= null_frame_id
;
1187 tp
->step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1188 tp
->stop_requested
= 0;
1192 tp
->proceed_to_finish
= 0;
1194 /* Discard any remaining commands or status from previous stop. */
1195 bpstat_clear (&tp
->stop_bpstat
);
1199 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
1201 if (is_exited (tp
->ptid
))
1204 clear_proceed_status_thread (tp
);
1209 clear_proceed_status (void)
1211 if (!ptid_equal (inferior_ptid
, null_ptid
))
1213 struct inferior
*inferior
;
1217 /* If in non-stop mode, only delete the per-thread status
1218 of the current thread. */
1219 clear_proceed_status_thread (inferior_thread ());
1223 /* In all-stop mode, delete the per-thread status of
1225 iterate_over_threads (clear_proceed_status_callback
, NULL
);
1228 inferior
= current_inferior ();
1229 inferior
->stop_soon
= NO_STOP_QUIETLY
;
1232 stop_after_trap
= 0;
1233 breakpoint_proceeded
= 1; /* We're about to proceed... */
1237 regcache_xfree (stop_registers
);
1238 stop_registers
= NULL
;
1242 /* This should be suitable for any targets that support threads. */
1245 prepare_to_proceed (int step
)
1248 struct target_waitstatus wait_status
;
1250 /* Get the last target status returned by target_wait(). */
1251 get_last_target_status (&wait_ptid
, &wait_status
);
1253 /* Make sure we were stopped at a breakpoint. */
1254 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1255 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1260 /* Switched over from WAIT_PID. */
1261 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1262 && !ptid_equal (inferior_ptid
, wait_ptid
))
1264 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1266 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1268 /* If stepping, remember current thread to switch back to. */
1270 deferred_step_ptid
= inferior_ptid
;
1272 /* Switch back to WAIT_PID thread. */
1273 switch_to_thread (wait_ptid
);
1275 /* We return 1 to indicate that there is a breakpoint here,
1276 so we need to step over it before continuing to avoid
1277 hitting it straight away. */
1285 /* Basic routine for continuing the program in various fashions.
1287 ADDR is the address to resume at, or -1 for resume where stopped.
1288 SIGGNAL is the signal to give it, or 0 for none,
1289 or -1 for act according to how it stopped.
1290 STEP is nonzero if should trap after one instruction.
1291 -1 means return after that and print nothing.
1292 You should probably set various step_... variables
1293 before calling here, if you are stepping.
1295 You should call clear_proceed_status before calling proceed. */
1298 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1300 struct regcache
*regcache
= get_current_regcache ();
1301 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1302 struct thread_info
*tp
;
1303 CORE_ADDR pc
= regcache_read_pc (regcache
);
1307 step_start_function
= find_pc_function (pc
);
1309 stop_after_trap
= 1;
1311 if (addr
== (CORE_ADDR
) -1)
1313 if (pc
== stop_pc
&& breakpoint_here_p (pc
)
1314 && execution_direction
!= EXEC_REVERSE
)
1315 /* There is a breakpoint at the address we will resume at,
1316 step one instruction before inserting breakpoints so that
1317 we do not stop right away (and report a second hit at this
1320 Note, we don't do this in reverse, because we won't
1321 actually be executing the breakpoint insn anyway.
1322 We'll be (un-)executing the previous instruction. */
1325 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1326 && gdbarch_single_step_through_delay (gdbarch
,
1327 get_current_frame ()))
1328 /* We stepped onto an instruction that needs to be stepped
1329 again before re-inserting the breakpoint, do so. */
1334 regcache_write_pc (regcache
, addr
);
1338 fprintf_unfiltered (gdb_stdlog
,
1339 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1340 paddr_nz (addr
), siggnal
, step
);
1343 /* In non-stop, each thread is handled individually. The context
1344 must already be set to the right thread here. */
1348 /* In a multi-threaded task we may select another thread and
1349 then continue or step.
1351 But if the old thread was stopped at a breakpoint, it will
1352 immediately cause another breakpoint stop without any
1353 execution (i.e. it will report a breakpoint hit incorrectly).
1354 So we must step over it first.
1356 prepare_to_proceed checks the current thread against the
1357 thread that reported the most recent event. If a step-over
1358 is required it returns TRUE and sets the current thread to
1360 if (prepare_to_proceed (step
))
1364 /* prepare_to_proceed may change the current thread. */
1365 tp
= inferior_thread ();
1369 tp
->trap_expected
= 1;
1370 /* If displaced stepping is enabled, we can step over the
1371 breakpoint without hitting it, so leave all breakpoints
1372 inserted. Otherwise we need to disable all breakpoints, step
1373 one instruction, and then re-add them when that step is
1375 if (!use_displaced_stepping (gdbarch
))
1376 remove_breakpoints ();
1379 /* We can insert breakpoints if we're not trying to step over one,
1380 or if we are stepping over one but we're using displaced stepping
1382 if (! tp
->trap_expected
|| use_displaced_stepping (gdbarch
))
1383 insert_breakpoints ();
1387 /* Pass the last stop signal to the thread we're resuming,
1388 irrespective of whether the current thread is the thread that
1389 got the last event or not. This was historically GDB's
1390 behaviour before keeping a stop_signal per thread. */
1392 struct thread_info
*last_thread
;
1394 struct target_waitstatus last_status
;
1396 get_last_target_status (&last_ptid
, &last_status
);
1397 if (!ptid_equal (inferior_ptid
, last_ptid
)
1398 && !ptid_equal (last_ptid
, null_ptid
)
1399 && !ptid_equal (last_ptid
, minus_one_ptid
))
1401 last_thread
= find_thread_pid (last_ptid
);
1404 tp
->stop_signal
= last_thread
->stop_signal
;
1405 last_thread
->stop_signal
= TARGET_SIGNAL_0
;
1410 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1411 tp
->stop_signal
= siggnal
;
1412 /* If this signal should not be seen by program,
1413 give it zero. Used for debugging signals. */
1414 else if (!signal_program
[tp
->stop_signal
])
1415 tp
->stop_signal
= TARGET_SIGNAL_0
;
1417 annotate_starting ();
1419 /* Make sure that output from GDB appears before output from the
1421 gdb_flush (gdb_stdout
);
1423 /* Refresh prev_pc value just prior to resuming. This used to be
1424 done in stop_stepping, however, setting prev_pc there did not handle
1425 scenarios such as inferior function calls or returning from
1426 a function via the return command. In those cases, the prev_pc
1427 value was not set properly for subsequent commands. The prev_pc value
1428 is used to initialize the starting line number in the ecs. With an
1429 invalid value, the gdb next command ends up stopping at the position
1430 represented by the next line table entry past our start position.
1431 On platforms that generate one line table entry per line, this
1432 is not a problem. However, on the ia64, the compiler generates
1433 extraneous line table entries that do not increase the line number.
1434 When we issue the gdb next command on the ia64 after an inferior call
1435 or a return command, we often end up a few instructions forward, still
1436 within the original line we started.
1438 An attempt was made to have init_execution_control_state () refresh
1439 the prev_pc value before calculating the line number. This approach
1440 did not work because on platforms that use ptrace, the pc register
1441 cannot be read unless the inferior is stopped. At that point, we
1442 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1443 call can fail. Setting the prev_pc value here ensures the value is
1444 updated correctly when the inferior is stopped. */
1445 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
1447 /* Fill in with reasonable starting values. */
1448 init_thread_stepping_state (tp
);
1450 /* Reset to normal state. */
1451 init_infwait_state ();
1453 /* Resume inferior. */
1454 resume (oneproc
|| step
|| bpstat_should_step (), tp
->stop_signal
);
1456 /* Wait for it to stop (if not standalone)
1457 and in any case decode why it stopped, and act accordingly. */
1458 /* Do this only if we are not using the event loop, or if the target
1459 does not support asynchronous execution. */
1460 if (!target_can_async_p ())
1462 wait_for_inferior (0);
1468 /* Start remote-debugging of a machine over a serial link. */
1471 start_remote (int from_tty
)
1473 struct inferior
*inferior
;
1474 init_wait_for_inferior ();
1476 inferior
= current_inferior ();
1477 inferior
->stop_soon
= STOP_QUIETLY_REMOTE
;
1479 /* Always go on waiting for the target, regardless of the mode. */
1480 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1481 indicate to wait_for_inferior that a target should timeout if
1482 nothing is returned (instead of just blocking). Because of this,
1483 targets expecting an immediate response need to, internally, set
1484 things up so that the target_wait() is forced to eventually
1486 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1487 differentiate to its caller what the state of the target is after
1488 the initial open has been performed. Here we're assuming that
1489 the target has stopped. It should be possible to eventually have
1490 target_open() return to the caller an indication that the target
1491 is currently running and GDB state should be set to the same as
1492 for an async run. */
1493 wait_for_inferior (0);
1495 /* Now that the inferior has stopped, do any bookkeeping like
1496 loading shared libraries. We want to do this before normal_stop,
1497 so that the displayed frame is up to date. */
1498 post_create_inferior (¤t_target
, from_tty
);
1503 /* Initialize static vars when a new inferior begins. */
1506 init_wait_for_inferior (void)
1508 /* These are meaningless until the first time through wait_for_inferior. */
1510 breakpoint_init_inferior (inf_starting
);
1512 /* The first resume is not following a fork/vfork/exec. */
1513 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1515 clear_proceed_status ();
1517 stepping_past_singlestep_breakpoint
= 0;
1518 deferred_step_ptid
= null_ptid
;
1520 target_last_wait_ptid
= minus_one_ptid
;
1522 previous_inferior_ptid
= null_ptid
;
1523 init_infwait_state ();
1525 displaced_step_clear ();
1529 /* This enum encodes possible reasons for doing a target_wait, so that
1530 wfi can call target_wait in one place. (Ultimately the call will be
1531 moved out of the infinite loop entirely.) */
1535 infwait_normal_state
,
1536 infwait_thread_hop_state
,
1537 infwait_step_watch_state
,
1538 infwait_nonstep_watch_state
1541 /* Why did the inferior stop? Used to print the appropriate messages
1542 to the interface from within handle_inferior_event(). */
1543 enum inferior_stop_reason
1545 /* Step, next, nexti, stepi finished. */
1547 /* Inferior terminated by signal. */
1549 /* Inferior exited. */
1551 /* Inferior received signal, and user asked to be notified. */
1553 /* Reverse execution -- target ran out of history info. */
1557 /* The PTID we'll do a target_wait on.*/
1560 /* Current inferior wait state. */
1561 enum infwait_states infwait_state
;
1563 /* Data to be passed around while handling an event. This data is
1564 discarded between events. */
1565 struct execution_control_state
1568 /* The thread that got the event, if this was a thread event; NULL
1570 struct thread_info
*event_thread
;
1572 struct target_waitstatus ws
;
1574 CORE_ADDR stop_func_start
;
1575 CORE_ADDR stop_func_end
;
1576 char *stop_func_name
;
1577 int new_thread_event
;
1581 void init_execution_control_state (struct execution_control_state
*ecs
);
1583 void handle_inferior_event (struct execution_control_state
*ecs
);
1585 static void handle_step_into_function (struct execution_control_state
*ecs
);
1586 static void handle_step_into_function_backward (struct execution_control_state
*ecs
);
1587 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1588 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1589 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1590 struct frame_id sr_id
);
1591 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1593 static void stop_stepping (struct execution_control_state
*ecs
);
1594 static void prepare_to_wait (struct execution_control_state
*ecs
);
1595 static void keep_going (struct execution_control_state
*ecs
);
1596 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1599 /* Callback for iterate over threads. If the thread is stopped, but
1600 the user/frontend doesn't know about that yet, go through
1601 normal_stop, as if the thread had just stopped now. ARG points at
1602 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
1603 ptid_is_pid(PTID) is true, applies to all threads of the process
1604 pointed at by PTID. Otherwise, apply only to the thread pointed by
1608 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
1610 ptid_t ptid
= * (ptid_t
*) arg
;
1612 if ((ptid_equal (info
->ptid
, ptid
)
1613 || ptid_equal (minus_one_ptid
, ptid
)
1614 || (ptid_is_pid (ptid
)
1615 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
1616 && is_running (info
->ptid
)
1617 && !is_executing (info
->ptid
))
1619 struct cleanup
*old_chain
;
1620 struct execution_control_state ecss
;
1621 struct execution_control_state
*ecs
= &ecss
;
1623 memset (ecs
, 0, sizeof (*ecs
));
1625 old_chain
= make_cleanup_restore_current_thread ();
1627 switch_to_thread (info
->ptid
);
1629 /* Go through handle_inferior_event/normal_stop, so we always
1630 have consistent output as if the stop event had been
1632 ecs
->ptid
= info
->ptid
;
1633 ecs
->event_thread
= find_thread_pid (info
->ptid
);
1634 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1635 ecs
->ws
.value
.sig
= TARGET_SIGNAL_0
;
1637 handle_inferior_event (ecs
);
1639 if (!ecs
->wait_some_more
)
1641 struct thread_info
*tp
;
1645 /* Finish off the continuations. The continations
1646 themselves are responsible for realising the thread
1647 didn't finish what it was supposed to do. */
1648 tp
= inferior_thread ();
1649 do_all_intermediate_continuations_thread (tp
);
1650 do_all_continuations_thread (tp
);
1653 do_cleanups (old_chain
);
1659 /* This function is attached as a "thread_stop_requested" observer.
1660 Cleanup local state that assumed the PTID was to be resumed, and
1661 report the stop to the frontend. */
1664 infrun_thread_stop_requested (ptid_t ptid
)
1666 struct displaced_step_request
*it
, *next
, *prev
= NULL
;
1668 /* PTID was requested to stop. Remove it from the displaced
1669 stepping queue, so we don't try to resume it automatically. */
1670 for (it
= displaced_step_request_queue
; it
; it
= next
)
1674 if (ptid_equal (it
->ptid
, ptid
)
1675 || ptid_equal (minus_one_ptid
, ptid
)
1676 || (ptid_is_pid (ptid
)
1677 && ptid_get_pid (ptid
) == ptid_get_pid (it
->ptid
)))
1679 if (displaced_step_request_queue
== it
)
1680 displaced_step_request_queue
= it
->next
;
1682 prev
->next
= it
->next
;
1690 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
1693 /* Callback for iterate_over_threads. */
1696 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
1698 if (is_exited (info
->ptid
))
1701 delete_step_resume_breakpoint (info
);
1705 /* In all-stop, delete the step resume breakpoint of any thread that
1706 had one. In non-stop, delete the step resume breakpoint of the
1707 thread that just stopped. */
1710 delete_step_thread_step_resume_breakpoint (void)
1712 if (!target_has_execution
1713 || ptid_equal (inferior_ptid
, null_ptid
))
1714 /* If the inferior has exited, we have already deleted the step
1715 resume breakpoints out of GDB's lists. */
1720 /* If in non-stop mode, only delete the step-resume or
1721 longjmp-resume breakpoint of the thread that just stopped
1723 struct thread_info
*tp
= inferior_thread ();
1724 delete_step_resume_breakpoint (tp
);
1727 /* In all-stop mode, delete all step-resume and longjmp-resume
1728 breakpoints of any thread that had them. */
1729 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
1732 /* A cleanup wrapper. */
1735 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
1737 delete_step_thread_step_resume_breakpoint ();
1740 /* Wait for control to return from inferior to debugger.
1742 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1743 as if they were SIGTRAP signals. This can be useful during
1744 the startup sequence on some targets such as HP/UX, where
1745 we receive an EXEC event instead of the expected SIGTRAP.
1747 If inferior gets a signal, we may decide to start it up again
1748 instead of returning. That is why there is a loop in this function.
1749 When this function actually returns it means the inferior
1750 should be left stopped and GDB should read more commands. */
1753 wait_for_inferior (int treat_exec_as_sigtrap
)
1755 struct cleanup
*old_cleanups
;
1756 struct execution_control_state ecss
;
1757 struct execution_control_state
*ecs
;
1761 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1762 treat_exec_as_sigtrap
);
1765 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
1768 memset (ecs
, 0, sizeof (*ecs
));
1770 overlay_cache_invalid
= 1;
1772 /* We'll update this if & when we switch to a new thread. */
1773 previous_inferior_ptid
= inferior_ptid
;
1775 /* We have to invalidate the registers BEFORE calling target_wait
1776 because they can be loaded from the target while in target_wait.
1777 This makes remote debugging a bit more efficient for those
1778 targets that provide critical registers as part of their normal
1779 status mechanism. */
1781 registers_changed ();
1785 struct cleanup
*old_chain
;
1787 if (deprecated_target_wait_hook
)
1788 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1790 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1792 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
1794 xfree (ecs
->ws
.value
.execd_pathname
);
1795 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1796 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
1799 /* If an error happens while handling the event, propagate GDB's
1800 knowledge of the executing state to the frontend/user running
1802 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
1804 /* Now figure out what to do with the result of the result. */
1805 handle_inferior_event (ecs
);
1807 /* No error, don't finish the state yet. */
1808 discard_cleanups (old_chain
);
1810 if (!ecs
->wait_some_more
)
1814 do_cleanups (old_cleanups
);
1817 /* Asynchronous version of wait_for_inferior. It is called by the
1818 event loop whenever a change of state is detected on the file
1819 descriptor corresponding to the target. It can be called more than
1820 once to complete a single execution command. In such cases we need
1821 to keep the state in a global variable ECSS. If it is the last time
1822 that this function is called for a single execution command, then
1823 report to the user that the inferior has stopped, and do the
1824 necessary cleanups. */
1827 fetch_inferior_event (void *client_data
)
1829 struct execution_control_state ecss
;
1830 struct execution_control_state
*ecs
= &ecss
;
1831 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
1832 struct cleanup
*ts_old_chain
;
1833 int was_sync
= sync_execution
;
1835 memset (ecs
, 0, sizeof (*ecs
));
1837 overlay_cache_invalid
= 1;
1839 /* We can only rely on wait_for_more being correct before handling
1840 the event in all-stop, but previous_inferior_ptid isn't used in
1842 if (!ecs
->wait_some_more
)
1843 /* We'll update this if & when we switch to a new thread. */
1844 previous_inferior_ptid
= inferior_ptid
;
1847 /* In non-stop mode, the user/frontend should not notice a thread
1848 switch due to internal events. Make sure we reverse to the
1849 user selected thread and frame after handling the event and
1850 running any breakpoint commands. */
1851 make_cleanup_restore_current_thread ();
1853 /* We have to invalidate the registers BEFORE calling target_wait
1854 because they can be loaded from the target while in target_wait.
1855 This makes remote debugging a bit more efficient for those
1856 targets that provide critical registers as part of their normal
1857 status mechanism. */
1859 registers_changed ();
1861 if (deprecated_target_wait_hook
)
1863 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1865 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1868 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
1869 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1870 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
1871 /* In non-stop mode, each thread is handled individually. Switch
1872 early, so the global state is set correctly for this
1874 context_switch (ecs
->ptid
);
1876 /* If an error happens while handling the event, propagate GDB's
1877 knowledge of the executing state to the frontend/user running
1880 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
1882 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
1884 /* Now figure out what to do with the result of the result. */
1885 handle_inferior_event (ecs
);
1887 if (!ecs
->wait_some_more
)
1889 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
1891 delete_step_thread_step_resume_breakpoint ();
1893 /* We may not find an inferior if this was a process exit. */
1894 if (inf
== NULL
|| inf
->stop_soon
== NO_STOP_QUIETLY
)
1897 if (target_has_execution
1898 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1899 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1900 && ecs
->event_thread
->step_multi
1901 && ecs
->event_thread
->stop_step
)
1902 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1904 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1907 /* No error, don't finish the thread states yet. */
1908 discard_cleanups (ts_old_chain
);
1910 /* Revert thread and frame. */
1911 do_cleanups (old_chain
);
1913 /* If the inferior was in sync execution mode, and now isn't,
1914 restore the prompt. */
1915 if (was_sync
&& !sync_execution
)
1916 display_gdb_prompt (0);
1919 /* Prepare an execution control state for looping through a
1920 wait_for_inferior-type loop. */
1923 init_execution_control_state (struct execution_control_state
*ecs
)
1925 ecs
->random_signal
= 0;
1928 /* Clear context switchable stepping state. */
1931 init_thread_stepping_state (struct thread_info
*tss
)
1933 struct symtab_and_line sal
;
1935 tss
->stepping_over_breakpoint
= 0;
1936 tss
->step_after_step_resume_breakpoint
= 0;
1937 tss
->stepping_through_solib_after_catch
= 0;
1938 tss
->stepping_through_solib_catchpoints
= NULL
;
1940 sal
= find_pc_line (tss
->prev_pc
, 0);
1941 tss
->current_line
= sal
.line
;
1942 tss
->current_symtab
= sal
.symtab
;
1945 /* Return the cached copy of the last pid/waitstatus returned by
1946 target_wait()/deprecated_target_wait_hook(). The data is actually
1947 cached by handle_inferior_event(), which gets called immediately
1948 after target_wait()/deprecated_target_wait_hook(). */
1951 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1953 *ptidp
= target_last_wait_ptid
;
1954 *status
= target_last_waitstatus
;
1958 nullify_last_target_wait_ptid (void)
1960 target_last_wait_ptid
= minus_one_ptid
;
1963 /* Switch thread contexts. */
1966 context_switch (ptid_t ptid
)
1970 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
1971 target_pid_to_str (inferior_ptid
));
1972 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
1973 target_pid_to_str (ptid
));
1976 switch_to_thread (ptid
);
1980 adjust_pc_after_break (struct execution_control_state
*ecs
)
1982 struct regcache
*regcache
;
1983 struct gdbarch
*gdbarch
;
1984 CORE_ADDR breakpoint_pc
;
1986 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1987 we aren't, just return.
1989 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1990 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1991 implemented by software breakpoints should be handled through the normal
1994 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1995 different signals (SIGILL or SIGEMT for instance), but it is less
1996 clear where the PC is pointing afterwards. It may not match
1997 gdbarch_decr_pc_after_break. I don't know any specific target that
1998 generates these signals at breakpoints (the code has been in GDB since at
1999 least 1992) so I can not guess how to handle them here.
2001 In earlier versions of GDB, a target with
2002 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2003 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2004 target with both of these set in GDB history, and it seems unlikely to be
2005 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2007 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2010 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
2013 /* In reverse execution, when a breakpoint is hit, the instruction
2014 under it has already been de-executed. The reported PC always
2015 points at the breakpoint address, so adjusting it further would
2016 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2019 B1 0x08000000 : INSN1
2020 B2 0x08000001 : INSN2
2022 PC -> 0x08000003 : INSN4
2024 Say you're stopped at 0x08000003 as above. Reverse continuing
2025 from that point should hit B2 as below. Reading the PC when the
2026 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2027 been de-executed already.
2029 B1 0x08000000 : INSN1
2030 B2 PC -> 0x08000001 : INSN2
2034 We can't apply the same logic as for forward execution, because
2035 we would wrongly adjust the PC to 0x08000000, since there's a
2036 breakpoint at PC - 1. We'd then report a hit on B1, although
2037 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2039 if (execution_direction
== EXEC_REVERSE
)
2042 /* If this target does not decrement the PC after breakpoints, then
2043 we have nothing to do. */
2044 regcache
= get_thread_regcache (ecs
->ptid
);
2045 gdbarch
= get_regcache_arch (regcache
);
2046 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
2049 /* Find the location where (if we've hit a breakpoint) the
2050 breakpoint would be. */
2051 breakpoint_pc
= regcache_read_pc (regcache
)
2052 - gdbarch_decr_pc_after_break (gdbarch
);
2054 /* Check whether there actually is a software breakpoint inserted at
2057 If in non-stop mode, a race condition is possible where we've
2058 removed a breakpoint, but stop events for that breakpoint were
2059 already queued and arrive later. To suppress those spurious
2060 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
2061 and retire them after a number of stop events are reported. */
2062 if (software_breakpoint_inserted_here_p (breakpoint_pc
)
2063 || (non_stop
&& moribund_breakpoint_here_p (breakpoint_pc
)))
2065 /* When using hardware single-step, a SIGTRAP is reported for both
2066 a completed single-step and a software breakpoint. Need to
2067 differentiate between the two, as the latter needs adjusting
2068 but the former does not.
2070 The SIGTRAP can be due to a completed hardware single-step only if
2071 - we didn't insert software single-step breakpoints
2072 - the thread to be examined is still the current thread
2073 - this thread is currently being stepped
2075 If any of these events did not occur, we must have stopped due
2076 to hitting a software breakpoint, and have to back up to the
2079 As a special case, we could have hardware single-stepped a
2080 software breakpoint. In this case (prev_pc == breakpoint_pc),
2081 we also need to back up to the breakpoint address. */
2083 if (singlestep_breakpoints_inserted_p
2084 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
2085 || !currently_stepping (ecs
->event_thread
)
2086 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
2087 regcache_write_pc (regcache
, breakpoint_pc
);
2092 init_infwait_state (void)
2094 waiton_ptid
= pid_to_ptid (-1);
2095 infwait_state
= infwait_normal_state
;
2099 error_is_running (void)
2102 Cannot execute this command while the selected thread is running."));
2106 ensure_not_running (void)
2108 if (is_running (inferior_ptid
))
2109 error_is_running ();
2112 /* Given an execution control state that has been freshly filled in
2113 by an event from the inferior, figure out what it means and take
2114 appropriate action. */
2117 handle_inferior_event (struct execution_control_state
*ecs
)
2119 int sw_single_step_trap_p
= 0;
2120 int stopped_by_watchpoint
;
2121 int stepped_after_stopped_by_watchpoint
= 0;
2122 struct symtab_and_line stop_pc_sal
;
2123 enum stop_kind stop_soon
;
2125 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2126 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2127 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2129 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2131 stop_soon
= inf
->stop_soon
;
2134 stop_soon
= NO_STOP_QUIETLY
;
2136 /* Cache the last pid/waitstatus. */
2137 target_last_wait_ptid
= ecs
->ptid
;
2138 target_last_waitstatus
= ecs
->ws
;
2140 /* Always clear state belonging to the previous time we stopped. */
2141 stop_stack_dummy
= 0;
2143 /* If it's a new process, add it to the thread database */
2145 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
2146 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
2147 && !in_thread_list (ecs
->ptid
));
2149 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2150 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
2151 add_thread (ecs
->ptid
);
2153 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2155 /* Dependent on valid ECS->EVENT_THREAD. */
2156 adjust_pc_after_break (ecs
);
2158 /* Dependent on the current PC value modified by adjust_pc_after_break. */
2159 reinit_frame_cache ();
2161 if (ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2163 breakpoint_retire_moribund ();
2165 /* Mark the non-executing threads accordingly. In all-stop, all
2166 threads of all processes are stopped when we get any event
2167 reported. In non-stop mode, only the event thread stops. If
2168 we're handling a process exit in non-stop mode, there's
2169 nothing to do, as threads of the dead process are gone, and
2170 threads of any other process were left running. */
2172 set_executing (minus_one_ptid
, 0);
2173 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2174 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
2175 set_executing (inferior_ptid
, 0);
2178 switch (infwait_state
)
2180 case infwait_thread_hop_state
:
2182 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
2183 /* Cancel the waiton_ptid. */
2184 waiton_ptid
= pid_to_ptid (-1);
2187 case infwait_normal_state
:
2189 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
2192 case infwait_step_watch_state
:
2194 fprintf_unfiltered (gdb_stdlog
,
2195 "infrun: infwait_step_watch_state\n");
2197 stepped_after_stopped_by_watchpoint
= 1;
2200 case infwait_nonstep_watch_state
:
2202 fprintf_unfiltered (gdb_stdlog
,
2203 "infrun: infwait_nonstep_watch_state\n");
2204 insert_breakpoints ();
2206 /* FIXME-maybe: is this cleaner than setting a flag? Does it
2207 handle things like signals arriving and other things happening
2208 in combination correctly? */
2209 stepped_after_stopped_by_watchpoint
= 1;
2213 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2215 infwait_state
= infwait_normal_state
;
2217 switch (ecs
->ws
.kind
)
2219 case TARGET_WAITKIND_LOADED
:
2221 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
2222 /* Ignore gracefully during startup of the inferior, as it might
2223 be the shell which has just loaded some objects, otherwise
2224 add the symbols for the newly loaded objects. Also ignore at
2225 the beginning of an attach or remote session; we will query
2226 the full list of libraries once the connection is
2228 if (stop_soon
== NO_STOP_QUIETLY
)
2230 /* Check for any newly added shared libraries if we're
2231 supposed to be adding them automatically. Switch
2232 terminal for any messages produced by
2233 breakpoint_re_set. */
2234 target_terminal_ours_for_output ();
2235 /* NOTE: cagney/2003-11-25: Make certain that the target
2236 stack's section table is kept up-to-date. Architectures,
2237 (e.g., PPC64), use the section table to perform
2238 operations such as address => section name and hence
2239 require the table to contain all sections (including
2240 those found in shared libraries). */
2241 /* NOTE: cagney/2003-11-25: Pass current_target and not
2242 exec_ops to SOLIB_ADD. This is because current GDB is
2243 only tooled to propagate section_table changes out from
2244 the "current_target" (see target_resize_to_sections), and
2245 not up from the exec stratum. This, of course, isn't
2246 right. "infrun.c" should only interact with the
2247 exec/process stratum, instead relying on the target stack
2248 to propagate relevant changes (stop, section table
2249 changed, ...) up to other layers. */
2251 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2253 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2255 target_terminal_inferior ();
2257 /* If requested, stop when the dynamic linker notifies
2258 gdb of events. This allows the user to get control
2259 and place breakpoints in initializer routines for
2260 dynamically loaded objects (among other things). */
2261 if (stop_on_solib_events
)
2263 stop_stepping (ecs
);
2267 /* NOTE drow/2007-05-11: This might be a good place to check
2268 for "catch load". */
2271 /* If we are skipping through a shell, or through shared library
2272 loading that we aren't interested in, resume the program. If
2273 we're running the program normally, also resume. But stop if
2274 we're attaching or setting up a remote connection. */
2275 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
2277 /* Loading of shared libraries might have changed breakpoint
2278 addresses. Make sure new breakpoints are inserted. */
2279 if (stop_soon
== NO_STOP_QUIETLY
2280 && !breakpoints_always_inserted_mode ())
2281 insert_breakpoints ();
2282 resume (0, TARGET_SIGNAL_0
);
2283 prepare_to_wait (ecs
);
2289 case TARGET_WAITKIND_SPURIOUS
:
2291 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
2292 resume (0, TARGET_SIGNAL_0
);
2293 prepare_to_wait (ecs
);
2296 case TARGET_WAITKIND_EXITED
:
2298 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
2299 inferior_ptid
= ecs
->ptid
;
2300 target_terminal_ours (); /* Must do this before mourn anyway */
2301 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
2303 /* Record the exit code in the convenience variable $_exitcode, so
2304 that the user can inspect this again later. */
2305 set_internalvar (lookup_internalvar ("_exitcode"),
2306 value_from_longest (builtin_type_int32
,
2307 (LONGEST
) ecs
->ws
.value
.integer
));
2308 gdb_flush (gdb_stdout
);
2309 target_mourn_inferior ();
2310 singlestep_breakpoints_inserted_p
= 0;
2311 stop_print_frame
= 0;
2312 stop_stepping (ecs
);
2315 case TARGET_WAITKIND_SIGNALLED
:
2317 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
2318 inferior_ptid
= ecs
->ptid
;
2319 stop_print_frame
= 0;
2320 target_terminal_ours (); /* Must do this before mourn anyway */
2322 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
2323 reach here unless the inferior is dead. However, for years
2324 target_kill() was called here, which hints that fatal signals aren't
2325 really fatal on some systems. If that's true, then some changes
2327 target_mourn_inferior ();
2329 print_stop_reason (SIGNAL_EXITED
, ecs
->ws
.value
.sig
);
2330 singlestep_breakpoints_inserted_p
= 0;
2331 stop_stepping (ecs
);
2334 /* The following are the only cases in which we keep going;
2335 the above cases end in a continue or goto. */
2336 case TARGET_WAITKIND_FORKED
:
2337 case TARGET_WAITKIND_VFORKED
:
2339 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
2340 pending_follow
.kind
= ecs
->ws
.kind
;
2342 pending_follow
.fork_event
.parent_pid
= ecs
->ptid
;
2343 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
2345 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2347 context_switch (ecs
->ptid
);
2348 reinit_frame_cache ();
2351 stop_pc
= read_pc ();
2353 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2355 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2357 /* If no catchpoint triggered for this, then keep going. */
2358 if (ecs
->random_signal
)
2360 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2364 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2365 goto process_event_stop_test
;
2367 case TARGET_WAITKIND_EXECD
:
2369 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
2370 pending_follow
.execd_pathname
=
2371 savestring (ecs
->ws
.value
.execd_pathname
,
2372 strlen (ecs
->ws
.value
.execd_pathname
));
2374 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2376 context_switch (ecs
->ptid
);
2377 reinit_frame_cache ();
2380 stop_pc
= read_pc ();
2382 /* This causes the eventpoints and symbol table to be reset.
2383 Must do this now, before trying to determine whether to
2385 follow_exec (inferior_ptid
, pending_follow
.execd_pathname
);
2386 xfree (pending_follow
.execd_pathname
);
2388 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2389 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2391 /* If no catchpoint triggered for this, then keep going. */
2392 if (ecs
->random_signal
)
2394 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2398 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2399 goto process_event_stop_test
;
2401 /* Be careful not to try to gather much state about a thread
2402 that's in a syscall. It's frequently a losing proposition. */
2403 case TARGET_WAITKIND_SYSCALL_ENTRY
:
2405 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
2406 resume (0, TARGET_SIGNAL_0
);
2407 prepare_to_wait (ecs
);
2410 /* Before examining the threads further, step this thread to
2411 get it entirely out of the syscall. (We get notice of the
2412 event when the thread is just on the verge of exiting a
2413 syscall. Stepping one instruction seems to get it back
2415 case TARGET_WAITKIND_SYSCALL_RETURN
:
2417 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
2418 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
2419 prepare_to_wait (ecs
);
2422 case TARGET_WAITKIND_STOPPED
:
2424 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
2425 ecs
->event_thread
->stop_signal
= ecs
->ws
.value
.sig
;
2428 case TARGET_WAITKIND_NO_HISTORY
:
2429 /* Reverse execution: target ran out of history info. */
2430 stop_pc
= read_pc ();
2431 print_stop_reason (NO_HISTORY
, 0);
2432 stop_stepping (ecs
);
2435 /* We had an event in the inferior, but we are not interested
2436 in handling it at this level. The lower layers have already
2437 done what needs to be done, if anything.
2439 One of the possible circumstances for this is when the
2440 inferior produces output for the console. The inferior has
2441 not stopped, and we are ignoring the event. Another possible
2442 circumstance is any event which the lower level knows will be
2443 reported multiple times without an intervening resume. */
2444 case TARGET_WAITKIND_IGNORE
:
2446 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
2447 prepare_to_wait (ecs
);
2451 if (ecs
->new_thread_event
)
2454 /* Non-stop assumes that the target handles adding new threads
2455 to the thread list. */
2456 internal_error (__FILE__
, __LINE__
, "\
2457 targets should add new threads to the thread list themselves in non-stop mode.");
2459 /* We may want to consider not doing a resume here in order to
2460 give the user a chance to play with the new thread. It might
2461 be good to make that a user-settable option. */
2463 /* At this point, all threads are stopped (happens automatically
2464 in either the OS or the native code). Therefore we need to
2465 continue all threads in order to make progress. */
2467 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2468 prepare_to_wait (ecs
);
2472 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
2474 /* Do we need to clean up the state of a thread that has
2475 completed a displaced single-step? (Doing so usually affects
2476 the PC, so do it here, before we set stop_pc.) */
2477 displaced_step_fixup (ecs
->ptid
, ecs
->event_thread
->stop_signal
);
2479 /* If we either finished a single-step or hit a breakpoint, but
2480 the user wanted this thread to be stopped, pretend we got a
2481 SIG0 (generic unsignaled stop). */
2483 if (ecs
->event_thread
->stop_requested
2484 && ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2485 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2488 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2492 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2493 paddr_nz (stop_pc
));
2494 if (STOPPED_BY_WATCHPOINT (&ecs
->ws
))
2497 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2499 if (target_stopped_data_address (¤t_target
, &addr
))
2500 fprintf_unfiltered (gdb_stdlog
,
2501 "infrun: stopped data address = 0x%s\n",
2504 fprintf_unfiltered (gdb_stdlog
,
2505 "infrun: (no data address available)\n");
2509 if (stepping_past_singlestep_breakpoint
)
2511 gdb_assert (singlestep_breakpoints_inserted_p
);
2512 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2513 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2515 stepping_past_singlestep_breakpoint
= 0;
2517 /* We've either finished single-stepping past the single-step
2518 breakpoint, or stopped for some other reason. It would be nice if
2519 we could tell, but we can't reliably. */
2520 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2523 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2524 /* Pull the single step breakpoints out of the target. */
2525 remove_single_step_breakpoints ();
2526 singlestep_breakpoints_inserted_p
= 0;
2528 ecs
->random_signal
= 0;
2530 context_switch (saved_singlestep_ptid
);
2531 if (deprecated_context_hook
)
2532 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2534 resume (1, TARGET_SIGNAL_0
);
2535 prepare_to_wait (ecs
);
2540 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2542 /* In non-stop mode, there's never a deferred_step_ptid set. */
2543 gdb_assert (!non_stop
);
2545 /* If we stopped for some other reason than single-stepping, ignore
2546 the fact that we were supposed to switch back. */
2547 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2550 fprintf_unfiltered (gdb_stdlog
,
2551 "infrun: handling deferred step\n");
2553 /* Pull the single step breakpoints out of the target. */
2554 if (singlestep_breakpoints_inserted_p
)
2556 remove_single_step_breakpoints ();
2557 singlestep_breakpoints_inserted_p
= 0;
2560 /* Note: We do not call context_switch at this point, as the
2561 context is already set up for stepping the original thread. */
2562 switch_to_thread (deferred_step_ptid
);
2563 deferred_step_ptid
= null_ptid
;
2564 /* Suppress spurious "Switching to ..." message. */
2565 previous_inferior_ptid
= inferior_ptid
;
2567 resume (1, TARGET_SIGNAL_0
);
2568 prepare_to_wait (ecs
);
2572 deferred_step_ptid
= null_ptid
;
2575 /* See if a thread hit a thread-specific breakpoint that was meant for
2576 another thread. If so, then step that thread past the breakpoint,
2579 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2581 int thread_hop_needed
= 0;
2583 /* Check if a regular breakpoint has been hit before checking
2584 for a potential single step breakpoint. Otherwise, GDB will
2585 not see this breakpoint hit when stepping onto breakpoints. */
2586 if (regular_breakpoint_inserted_here_p (stop_pc
))
2588 ecs
->random_signal
= 0;
2589 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2590 thread_hop_needed
= 1;
2592 else if (singlestep_breakpoints_inserted_p
)
2594 /* We have not context switched yet, so this should be true
2595 no matter which thread hit the singlestep breakpoint. */
2596 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2598 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2600 target_pid_to_str (ecs
->ptid
));
2602 ecs
->random_signal
= 0;
2603 /* The call to in_thread_list is necessary because PTIDs sometimes
2604 change when we go from single-threaded to multi-threaded. If
2605 the singlestep_ptid is still in the list, assume that it is
2606 really different from ecs->ptid. */
2607 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2608 && in_thread_list (singlestep_ptid
))
2610 /* If the PC of the thread we were trying to single-step
2611 has changed, discard this event (which we were going
2612 to ignore anyway), and pretend we saw that thread
2613 trap. This prevents us continuously moving the
2614 single-step breakpoint forward, one instruction at a
2615 time. If the PC has changed, then the thread we were
2616 trying to single-step has trapped or been signalled,
2617 but the event has not been reported to GDB yet.
2619 There might be some cases where this loses signal
2620 information, if a signal has arrived at exactly the
2621 same time that the PC changed, but this is the best
2622 we can do with the information available. Perhaps we
2623 should arrange to report all events for all threads
2624 when they stop, or to re-poll the remote looking for
2625 this particular thread (i.e. temporarily enable
2628 CORE_ADDR new_singlestep_pc
2629 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2631 if (new_singlestep_pc
!= singlestep_pc
)
2633 enum target_signal stop_signal
;
2636 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2637 " but expected thread advanced also\n");
2639 /* The current context still belongs to
2640 singlestep_ptid. Don't swap here, since that's
2641 the context we want to use. Just fudge our
2642 state and continue. */
2643 stop_signal
= ecs
->event_thread
->stop_signal
;
2644 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2645 ecs
->ptid
= singlestep_ptid
;
2646 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2647 ecs
->event_thread
->stop_signal
= stop_signal
;
2648 stop_pc
= new_singlestep_pc
;
2653 fprintf_unfiltered (gdb_stdlog
,
2654 "infrun: unexpected thread\n");
2656 thread_hop_needed
= 1;
2657 stepping_past_singlestep_breakpoint
= 1;
2658 saved_singlestep_ptid
= singlestep_ptid
;
2663 if (thread_hop_needed
)
2665 int remove_status
= 0;
2668 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2670 /* Saw a breakpoint, but it was hit by the wrong thread.
2673 if (singlestep_breakpoints_inserted_p
)
2675 /* Pull the single step breakpoints out of the target. */
2676 remove_single_step_breakpoints ();
2677 singlestep_breakpoints_inserted_p
= 0;
2680 /* If the arch can displace step, don't remove the
2682 if (!use_displaced_stepping (current_gdbarch
))
2683 remove_status
= remove_breakpoints ();
2685 /* Did we fail to remove breakpoints? If so, try
2686 to set the PC past the bp. (There's at least
2687 one situation in which we can fail to remove
2688 the bp's: On HP-UX's that use ttrace, we can't
2689 change the address space of a vforking child
2690 process until the child exits (well, okay, not
2691 then either :-) or execs. */
2692 if (remove_status
!= 0)
2693 error (_("Cannot step over breakpoint hit in wrong thread"));
2696 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2697 context_switch (ecs
->ptid
);
2701 /* Only need to require the next event from this
2702 thread in all-stop mode. */
2703 waiton_ptid
= ecs
->ptid
;
2704 infwait_state
= infwait_thread_hop_state
;
2707 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2709 registers_changed ();
2713 else if (singlestep_breakpoints_inserted_p
)
2715 sw_single_step_trap_p
= 1;
2716 ecs
->random_signal
= 0;
2720 ecs
->random_signal
= 1;
2722 /* See if something interesting happened to the non-current thread. If
2723 so, then switch to that thread. */
2724 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2727 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2729 context_switch (ecs
->ptid
);
2731 if (deprecated_context_hook
)
2732 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2735 if (singlestep_breakpoints_inserted_p
)
2737 /* Pull the single step breakpoints out of the target. */
2738 remove_single_step_breakpoints ();
2739 singlestep_breakpoints_inserted_p
= 0;
2742 if (stepped_after_stopped_by_watchpoint
)
2743 stopped_by_watchpoint
= 0;
2745 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
2747 /* If necessary, step over this watchpoint. We'll be back to display
2749 if (stopped_by_watchpoint
2750 && (HAVE_STEPPABLE_WATCHPOINT
2751 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
2753 /* At this point, we are stopped at an instruction which has
2754 attempted to write to a piece of memory under control of
2755 a watchpoint. The instruction hasn't actually executed
2756 yet. If we were to evaluate the watchpoint expression
2757 now, we would get the old value, and therefore no change
2758 would seem to have occurred.
2760 In order to make watchpoints work `right', we really need
2761 to complete the memory write, and then evaluate the
2762 watchpoint expression. We do this by single-stepping the
2765 It may not be necessary to disable the watchpoint to stop over
2766 it. For example, the PA can (with some kernel cooperation)
2767 single step over a watchpoint without disabling the watchpoint.
2769 It is far more common to need to disable a watchpoint to step
2770 the inferior over it. If we have non-steppable watchpoints,
2771 we must disable the current watchpoint; it's simplest to
2772 disable all watchpoints and breakpoints. */
2774 if (!HAVE_STEPPABLE_WATCHPOINT
)
2775 remove_breakpoints ();
2776 registers_changed ();
2777 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
2778 waiton_ptid
= ecs
->ptid
;
2779 if (HAVE_STEPPABLE_WATCHPOINT
)
2780 infwait_state
= infwait_step_watch_state
;
2782 infwait_state
= infwait_nonstep_watch_state
;
2783 prepare_to_wait (ecs
);
2787 ecs
->stop_func_start
= 0;
2788 ecs
->stop_func_end
= 0;
2789 ecs
->stop_func_name
= 0;
2790 /* Don't care about return value; stop_func_start and stop_func_name
2791 will both be 0 if it doesn't work. */
2792 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2793 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2794 ecs
->stop_func_start
2795 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
2796 ecs
->event_thread
->stepping_over_breakpoint
= 0;
2797 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
2798 ecs
->event_thread
->stop_step
= 0;
2799 stop_print_frame
= 1;
2800 ecs
->random_signal
= 0;
2801 stopped_by_random_signal
= 0;
2803 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2804 && ecs
->event_thread
->trap_expected
2805 && gdbarch_single_step_through_delay_p (current_gdbarch
)
2806 && currently_stepping (ecs
->event_thread
))
2808 /* We're trying to step off a breakpoint. Turns out that we're
2809 also on an instruction that needs to be stepped multiple
2810 times before it's been fully executing. E.g., architectures
2811 with a delay slot. It needs to be stepped twice, once for
2812 the instruction and once for the delay slot. */
2813 int step_through_delay
2814 = gdbarch_single_step_through_delay (current_gdbarch
,
2815 get_current_frame ());
2816 if (debug_infrun
&& step_through_delay
)
2817 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
2818 if (ecs
->event_thread
->step_range_end
== 0 && step_through_delay
)
2820 /* The user issued a continue when stopped at a breakpoint.
2821 Set up for another trap and get out of here. */
2822 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2826 else if (step_through_delay
)
2828 /* The user issued a step when stopped at a breakpoint.
2829 Maybe we should stop, maybe we should not - the delay
2830 slot *might* correspond to a line of source. In any
2831 case, don't decide that here, just set
2832 ecs->stepping_over_breakpoint, making sure we
2833 single-step again before breakpoints are re-inserted. */
2834 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2838 /* Look at the cause of the stop, and decide what to do.
2839 The alternatives are:
2840 1) stop_stepping and return; to really stop and return to the debugger,
2841 2) keep_going and return to start up again
2842 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
2843 3) set ecs->random_signal to 1, and the decision between 1 and 2
2844 will be made according to the signal handling tables. */
2846 /* First, distinguish signals caused by the debugger from signals
2847 that have to do with the program's own actions. Note that
2848 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
2849 on the operating system version. Here we detect when a SIGILL or
2850 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
2851 something similar for SIGSEGV, since a SIGSEGV will be generated
2852 when we're trying to execute a breakpoint instruction on a
2853 non-executable stack. This happens for call dummy breakpoints
2854 for architectures like SPARC that place call dummies on the
2857 If we're doing a displaced step past a breakpoint, then the
2858 breakpoint is always inserted at the original instruction;
2859 non-standard signals can't be explained by the breakpoint. */
2860 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2861 || (! ecs
->event_thread
->trap_expected
2862 && breakpoint_inserted_here_p (stop_pc
)
2863 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_ILL
2864 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_SEGV
2865 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_EMT
))
2866 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2867 || stop_soon
== STOP_QUIETLY_REMOTE
)
2869 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2872 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
2873 stop_print_frame
= 0;
2874 stop_stepping (ecs
);
2878 /* This is originated from start_remote(), start_inferior() and
2879 shared libraries hook functions. */
2880 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
2883 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
2884 stop_stepping (ecs
);
2888 /* This originates from attach_command(). We need to overwrite
2889 the stop_signal here, because some kernels don't ignore a
2890 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
2891 See more comments in inferior.h. On the other hand, if we
2892 get a non-SIGSTOP, report it to the user - assume the backend
2893 will handle the SIGSTOP if it should show up later.
2895 Also consider that the attach is complete when we see a
2896 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
2897 target extended-remote report it instead of a SIGSTOP
2898 (e.g. gdbserver). We already rely on SIGTRAP being our
2899 signal, so this is no exception.
2901 Also consider that the attach is complete when we see a
2902 TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell
2903 the target to stop all threads of the inferior, in case the
2904 low level attach operation doesn't stop them implicitly. If
2905 they weren't stopped implicitly, then the stub will report a
2906 TARGET_SIGNAL_0, meaning: stopped for no particular reason
2907 other than GDB's request. */
2908 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2909 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_STOP
2910 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2911 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_0
))
2913 stop_stepping (ecs
);
2914 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2918 /* See if there is a breakpoint at the current PC. */
2919 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2921 /* Following in case break condition called a
2923 stop_print_frame
= 1;
2925 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2926 at one stage in the past included checks for an inferior
2927 function call's call dummy's return breakpoint. The original
2928 comment, that went with the test, read:
2930 ``End of a stack dummy. Some systems (e.g. Sony news) give
2931 another signal besides SIGTRAP, so check here as well as
2934 If someone ever tries to get call dummys on a
2935 non-executable stack to work (where the target would stop
2936 with something like a SIGSEGV), then those tests might need
2937 to be re-instated. Given, however, that the tests were only
2938 enabled when momentary breakpoints were not being used, I
2939 suspect that it won't be the case.
2941 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2942 be necessary for call dummies on a non-executable stack on
2945 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2947 = !(bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
)
2948 || ecs
->event_thread
->trap_expected
2949 || (ecs
->event_thread
->step_range_end
2950 && ecs
->event_thread
->step_resume_breakpoint
== NULL
));
2953 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2954 if (!ecs
->random_signal
)
2955 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2959 /* When we reach this point, we've pretty much decided
2960 that the reason for stopping must've been a random
2961 (unexpected) signal. */
2964 ecs
->random_signal
= 1;
2966 process_event_stop_test
:
2967 /* For the program's own signals, act according to
2968 the signal handling tables. */
2970 if (ecs
->random_signal
)
2972 /* Signal not for debugging purposes. */
2976 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
2977 ecs
->event_thread
->stop_signal
);
2979 stopped_by_random_signal
= 1;
2981 if (signal_print
[ecs
->event_thread
->stop_signal
])
2984 target_terminal_ours_for_output ();
2985 print_stop_reason (SIGNAL_RECEIVED
, ecs
->event_thread
->stop_signal
);
2987 /* Always stop on signals if we're either just gaining control
2988 of the program, or the user explicitly requested this thread
2989 to remain stopped. */
2990 if (stop_soon
!= NO_STOP_QUIETLY
2991 || ecs
->event_thread
->stop_requested
2992 || signal_stop_state (ecs
->event_thread
->stop_signal
))
2994 stop_stepping (ecs
);
2997 /* If not going to stop, give terminal back
2998 if we took it away. */
3000 target_terminal_inferior ();
3002 /* Clear the signal if it should not be passed. */
3003 if (signal_program
[ecs
->event_thread
->stop_signal
] == 0)
3004 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3006 if (ecs
->event_thread
->prev_pc
== read_pc ()
3007 && ecs
->event_thread
->trap_expected
3008 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3010 /* We were just starting a new sequence, attempting to
3011 single-step off of a breakpoint and expecting a SIGTRAP.
3012 Instead this signal arrives. This signal will take us out
3013 of the stepping range so GDB needs to remember to, when
3014 the signal handler returns, resume stepping off that
3016 /* To simplify things, "continue" is forced to use the same
3017 code paths as single-step - set a breakpoint at the
3018 signal return address and then, once hit, step off that
3021 fprintf_unfiltered (gdb_stdlog
,
3022 "infrun: signal arrived while stepping over "
3025 insert_step_resume_breakpoint_at_frame (get_current_frame ());
3026 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
3031 if (ecs
->event_thread
->step_range_end
!= 0
3032 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_0
3033 && (ecs
->event_thread
->step_range_start
<= stop_pc
3034 && stop_pc
< ecs
->event_thread
->step_range_end
)
3035 && frame_id_eq (get_frame_id (get_current_frame ()),
3036 ecs
->event_thread
->step_frame_id
)
3037 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3039 /* The inferior is about to take a signal that will take it
3040 out of the single step range. Set a breakpoint at the
3041 current PC (which is presumably where the signal handler
3042 will eventually return) and then allow the inferior to
3045 Note that this is only needed for a signal delivered
3046 while in the single-step range. Nested signals aren't a
3047 problem as they eventually all return. */
3049 fprintf_unfiltered (gdb_stdlog
,
3050 "infrun: signal may take us out of "
3051 "single-step range\n");
3053 insert_step_resume_breakpoint_at_frame (get_current_frame ());
3058 /* Note: step_resume_breakpoint may be non-NULL. This occures
3059 when either there's a nested signal, or when there's a
3060 pending signal enabled just as the signal handler returns
3061 (leaving the inferior at the step-resume-breakpoint without
3062 actually executing it). Either way continue until the
3063 breakpoint is really hit. */
3068 /* Handle cases caused by hitting a breakpoint. */
3070 CORE_ADDR jmp_buf_pc
;
3071 struct bpstat_what what
;
3073 what
= bpstat_what (ecs
->event_thread
->stop_bpstat
);
3075 if (what
.call_dummy
)
3077 stop_stack_dummy
= 1;
3080 switch (what
.main_action
)
3082 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
3083 /* If we hit the breakpoint at longjmp while stepping, we
3084 install a momentary breakpoint at the target of the
3088 fprintf_unfiltered (gdb_stdlog
,
3089 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
3091 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3093 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
3094 || !gdbarch_get_longjmp_target (current_gdbarch
,
3095 get_current_frame (), &jmp_buf_pc
))
3098 fprintf_unfiltered (gdb_stdlog
, "\
3099 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
3104 /* We're going to replace the current step-resume breakpoint
3105 with a longjmp-resume breakpoint. */
3106 delete_step_resume_breakpoint (ecs
->event_thread
);
3108 /* Insert a breakpoint at resume address. */
3109 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
3114 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
3116 fprintf_unfiltered (gdb_stdlog
,
3117 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
3119 gdb_assert (ecs
->event_thread
->step_resume_breakpoint
!= NULL
);
3120 delete_step_resume_breakpoint (ecs
->event_thread
);
3122 ecs
->event_thread
->stop_step
= 1;
3123 print_stop_reason (END_STEPPING_RANGE
, 0);
3124 stop_stepping (ecs
);
3127 case BPSTAT_WHAT_SINGLE
:
3129 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
3130 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3131 /* Still need to check other stuff, at least the case
3132 where we are stepping and step out of the right range. */
3135 case BPSTAT_WHAT_STOP_NOISY
:
3137 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
3138 stop_print_frame
= 1;
3140 /* We are about to nuke the step_resume_breakpointt via the
3141 cleanup chain, so no need to worry about it here. */
3143 stop_stepping (ecs
);
3146 case BPSTAT_WHAT_STOP_SILENT
:
3148 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
3149 stop_print_frame
= 0;
3151 /* We are about to nuke the step_resume_breakpoin via the
3152 cleanup chain, so no need to worry about it here. */
3154 stop_stepping (ecs
);
3157 case BPSTAT_WHAT_STEP_RESUME
:
3159 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
3161 delete_step_resume_breakpoint (ecs
->event_thread
);
3162 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
3164 /* Back when the step-resume breakpoint was inserted, we
3165 were trying to single-step off a breakpoint. Go back
3167 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
3168 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3172 if (stop_pc
== ecs
->stop_func_start
3173 && execution_direction
== EXEC_REVERSE
)
3175 /* We are stepping over a function call in reverse, and
3176 just hit the step-resume breakpoint at the start
3177 address of the function. Go back to single-stepping,
3178 which should take us back to the function call. */
3179 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3185 case BPSTAT_WHAT_CHECK_SHLIBS
:
3188 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
3190 /* Check for any newly added shared libraries if we're
3191 supposed to be adding them automatically. Switch
3192 terminal for any messages produced by
3193 breakpoint_re_set. */
3194 target_terminal_ours_for_output ();
3195 /* NOTE: cagney/2003-11-25: Make certain that the target
3196 stack's section table is kept up-to-date. Architectures,
3197 (e.g., PPC64), use the section table to perform
3198 operations such as address => section name and hence
3199 require the table to contain all sections (including
3200 those found in shared libraries). */
3201 /* NOTE: cagney/2003-11-25: Pass current_target and not
3202 exec_ops to SOLIB_ADD. This is because current GDB is
3203 only tooled to propagate section_table changes out from
3204 the "current_target" (see target_resize_to_sections), and
3205 not up from the exec stratum. This, of course, isn't
3206 right. "infrun.c" should only interact with the
3207 exec/process stratum, instead relying on the target stack
3208 to propagate relevant changes (stop, section table
3209 changed, ...) up to other layers. */
3211 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
3213 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
3215 target_terminal_inferior ();
3217 /* If requested, stop when the dynamic linker notifies
3218 gdb of events. This allows the user to get control
3219 and place breakpoints in initializer routines for
3220 dynamically loaded objects (among other things). */
3221 if (stop_on_solib_events
|| stop_stack_dummy
)
3223 stop_stepping (ecs
);
3228 /* We want to step over this breakpoint, then keep going. */
3229 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3235 case BPSTAT_WHAT_LAST
:
3236 /* Not a real code, but listed here to shut up gcc -Wall. */
3238 case BPSTAT_WHAT_KEEP_CHECKING
:
3243 /* We come here if we hit a breakpoint but should not
3244 stop for it. Possibly we also were stepping
3245 and should stop for that. So fall through and
3246 test for stepping. But, if not stepping,
3249 /* In all-stop mode, if we're currently stepping but have stopped in
3250 some other thread, we need to switch back to the stepped thread. */
3253 struct thread_info
*tp
;
3254 tp
= iterate_over_threads (currently_stepping_callback
,
3258 /* However, if the current thread is blocked on some internal
3259 breakpoint, and we simply need to step over that breakpoint
3260 to get it going again, do that first. */
3261 if ((ecs
->event_thread
->trap_expected
3262 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
3263 || ecs
->event_thread
->stepping_over_breakpoint
)
3269 /* Otherwise, we no longer expect a trap in the current thread.
3270 Clear the trap_expected flag before switching back -- this is
3271 what keep_going would do as well, if we called it. */
3272 ecs
->event_thread
->trap_expected
= 0;
3275 fprintf_unfiltered (gdb_stdlog
,
3276 "infrun: switching back to stepped thread\n");
3278 ecs
->event_thread
= tp
;
3279 ecs
->ptid
= tp
->ptid
;
3280 context_switch (ecs
->ptid
);
3286 /* Are we stepping to get the inferior out of the dynamic linker's
3287 hook (and possibly the dld itself) after catching a shlib
3289 if (ecs
->event_thread
->stepping_through_solib_after_catch
)
3291 #if defined(SOLIB_ADD)
3292 /* Have we reached our destination? If not, keep going. */
3293 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
3296 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
3297 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3303 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
3304 /* Else, stop and report the catchpoint(s) whose triggering
3305 caused us to begin stepping. */
3306 ecs
->event_thread
->stepping_through_solib_after_catch
= 0;
3307 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3308 ecs
->event_thread
->stop_bpstat
3309 = bpstat_copy (ecs
->event_thread
->stepping_through_solib_catchpoints
);
3310 bpstat_clear (&ecs
->event_thread
->stepping_through_solib_catchpoints
);
3311 stop_print_frame
= 1;
3312 stop_stepping (ecs
);
3316 if (ecs
->event_thread
->step_resume_breakpoint
)
3319 fprintf_unfiltered (gdb_stdlog
,
3320 "infrun: step-resume breakpoint is inserted\n");
3322 /* Having a step-resume breakpoint overrides anything
3323 else having to do with stepping commands until
3324 that breakpoint is reached. */
3329 if (ecs
->event_thread
->step_range_end
== 0)
3332 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
3333 /* Likewise if we aren't even stepping. */
3338 /* If stepping through a line, keep going if still within it.
3340 Note that step_range_end is the address of the first instruction
3341 beyond the step range, and NOT the address of the last instruction
3343 if (stop_pc
>= ecs
->event_thread
->step_range_start
3344 && stop_pc
< ecs
->event_thread
->step_range_end
)
3347 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
3348 paddr_nz (ecs
->event_thread
->step_range_start
),
3349 paddr_nz (ecs
->event_thread
->step_range_end
));
3351 /* When stepping backward, stop at beginning of line range
3352 (unless it's the function entry point, in which case
3353 keep going back to the call point). */
3354 if (stop_pc
== ecs
->event_thread
->step_range_start
3355 && stop_pc
!= ecs
->stop_func_start
3356 && execution_direction
== EXEC_REVERSE
)
3358 ecs
->event_thread
->stop_step
= 1;
3359 print_stop_reason (END_STEPPING_RANGE
, 0);
3360 stop_stepping (ecs
);
3368 /* We stepped out of the stepping range. */
3370 /* If we are stepping at the source level and entered the runtime
3371 loader dynamic symbol resolution code, we keep on single stepping
3372 until we exit the run time loader code and reach the callee's
3374 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3375 && in_solib_dynsym_resolve_code (stop_pc
))
3377 CORE_ADDR pc_after_resolver
=
3378 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
3381 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
3383 if (pc_after_resolver
)
3385 /* Set up a step-resume breakpoint at the address
3386 indicated by SKIP_SOLIB_RESOLVER. */
3387 struct symtab_and_line sr_sal
;
3389 sr_sal
.pc
= pc_after_resolver
;
3391 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3398 if (ecs
->event_thread
->step_range_end
!= 1
3399 && (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3400 || ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3401 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
3404 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
3405 /* The inferior, while doing a "step" or "next", has ended up in
3406 a signal trampoline (either by a signal being delivered or by
3407 the signal handler returning). Just single-step until the
3408 inferior leaves the trampoline (either by calling the handler
3414 /* Check for subroutine calls. The check for the current frame
3415 equalling the step ID is not necessary - the check of the
3416 previous frame's ID is sufficient - but it is a common case and
3417 cheaper than checking the previous frame's ID.
3419 NOTE: frame_id_eq will never report two invalid frame IDs as
3420 being equal, so to get into this block, both the current and
3421 previous frame must have valid frame IDs. */
3422 if (!frame_id_eq (get_frame_id (get_current_frame ()),
3423 ecs
->event_thread
->step_frame_id
)
3424 && (frame_id_eq (frame_unwind_id (get_current_frame ()),
3425 ecs
->event_thread
->step_frame_id
)
3426 || execution_direction
== EXEC_REVERSE
))
3428 CORE_ADDR real_stop_pc
;
3431 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
3433 if ((ecs
->event_thread
->step_over_calls
== STEP_OVER_NONE
)
3434 || ((ecs
->event_thread
->step_range_end
== 1)
3435 && in_prologue (ecs
->event_thread
->prev_pc
,
3436 ecs
->stop_func_start
)))
3438 /* I presume that step_over_calls is only 0 when we're
3439 supposed to be stepping at the assembly language level
3440 ("stepi"). Just stop. */
3441 /* Also, maybe we just did a "nexti" inside a prolog, so we
3442 thought it was a subroutine call but it was not. Stop as
3444 ecs
->event_thread
->stop_step
= 1;
3445 print_stop_reason (END_STEPPING_RANGE
, 0);
3446 stop_stepping (ecs
);
3450 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3452 /* We're doing a "next".
3454 Normal (forward) execution: set a breakpoint at the
3455 callee's return address (the address at which the caller
3458 Reverse (backward) execution. set the step-resume
3459 breakpoint at the start of the function that we just
3460 stepped into (backwards), and continue to there. When we
3461 get there, we'll need to single-step back to the caller. */
3463 if (execution_direction
== EXEC_REVERSE
)
3465 struct symtab_and_line sr_sal
;
3467 if (ecs
->stop_func_start
== 0
3468 && in_solib_dynsym_resolve_code (stop_pc
))
3470 /* Stepped into runtime loader dynamic symbol
3471 resolution code. Since we're in reverse,
3472 we have already backed up through the runtime
3473 loader and the dynamic function. This is just
3474 the trampoline (jump table).
3476 Just keep stepping, we'll soon be home.
3481 /* Normal (staticly linked) function call return. */
3483 sr_sal
.pc
= ecs
->stop_func_start
;
3484 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3487 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3493 /* If we are in a function call trampoline (a stub between the
3494 calling routine and the real function), locate the real
3495 function. That's what tells us (a) whether we want to step
3496 into it at all, and (b) what prologue we want to run to the
3497 end of, if we do step into it. */
3498 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
3499 if (real_stop_pc
== 0)
3500 real_stop_pc
= gdbarch_skip_trampoline_code
3501 (current_gdbarch
, get_current_frame (), stop_pc
);
3502 if (real_stop_pc
!= 0)
3503 ecs
->stop_func_start
= real_stop_pc
;
3505 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
3507 struct symtab_and_line sr_sal
;
3509 sr_sal
.pc
= ecs
->stop_func_start
;
3511 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3516 /* If we have line number information for the function we are
3517 thinking of stepping into, step into it.
3519 If there are several symtabs at that PC (e.g. with include
3520 files), just want to know whether *any* of them have line
3521 numbers. find_pc_line handles this. */
3523 struct symtab_and_line tmp_sal
;
3525 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3526 if (tmp_sal
.line
!= 0)
3528 if (execution_direction
== EXEC_REVERSE
)
3529 handle_step_into_function_backward (ecs
);
3531 handle_step_into_function (ecs
);
3536 /* If we have no line number and the step-stop-if-no-debug is
3537 set, we stop the step so that the user has a chance to switch
3538 in assembly mode. */
3539 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3540 && step_stop_if_no_debug
)
3542 ecs
->event_thread
->stop_step
= 1;
3543 print_stop_reason (END_STEPPING_RANGE
, 0);
3544 stop_stepping (ecs
);
3548 if (execution_direction
== EXEC_REVERSE
)
3550 /* Set a breakpoint at callee's start address.
3551 From there we can step once and be back in the caller. */
3552 struct symtab_and_line sr_sal
;
3554 sr_sal
.pc
= ecs
->stop_func_start
;
3555 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3558 /* Set a breakpoint at callee's return address (the address
3559 at which the caller will resume). */
3560 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3566 /* If we're in the return path from a shared library trampoline,
3567 we want to proceed through the trampoline when stepping. */
3568 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
3569 stop_pc
, ecs
->stop_func_name
))
3571 /* Determine where this trampoline returns. */
3572 CORE_ADDR real_stop_pc
;
3573 real_stop_pc
= gdbarch_skip_trampoline_code
3574 (current_gdbarch
, get_current_frame (), stop_pc
);
3577 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3579 /* Only proceed through if we know where it's going. */
3582 /* And put the step-breakpoint there and go until there. */
3583 struct symtab_and_line sr_sal
;
3585 init_sal (&sr_sal
); /* initialize to zeroes */
3586 sr_sal
.pc
= real_stop_pc
;
3587 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3589 /* Do not specify what the fp should be when we stop since
3590 on some machines the prologue is where the new fp value
3592 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3594 /* Restart without fiddling with the step ranges or
3601 stop_pc_sal
= find_pc_line (stop_pc
, 0);
3603 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3604 the trampoline processing logic, however, there are some trampolines
3605 that have no names, so we should do trampoline handling first. */
3606 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3607 && ecs
->stop_func_name
== NULL
3608 && stop_pc_sal
.line
== 0)
3611 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3613 /* The inferior just stepped into, or returned to, an
3614 undebuggable function (where there is no debugging information
3615 and no line number corresponding to the address where the
3616 inferior stopped). Since we want to skip this kind of code,
3617 we keep going until the inferior returns from this
3618 function - unless the user has asked us not to (via
3619 set step-mode) or we no longer know how to get back
3620 to the call site. */
3621 if (step_stop_if_no_debug
3622 || !frame_id_p (frame_unwind_id (get_current_frame ())))
3624 /* If we have no line number and the step-stop-if-no-debug
3625 is set, we stop the step so that the user has a chance to
3626 switch in assembly mode. */
3627 ecs
->event_thread
->stop_step
= 1;
3628 print_stop_reason (END_STEPPING_RANGE
, 0);
3629 stop_stepping (ecs
);
3634 /* Set a breakpoint at callee's return address (the address
3635 at which the caller will resume). */
3636 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3642 if (ecs
->event_thread
->step_range_end
== 1)
3644 /* It is stepi or nexti. We always want to stop stepping after
3647 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3648 ecs
->event_thread
->stop_step
= 1;
3649 print_stop_reason (END_STEPPING_RANGE
, 0);
3650 stop_stepping (ecs
);
3654 if (stop_pc_sal
.line
== 0)
3656 /* We have no line number information. That means to stop
3657 stepping (does this always happen right after one instruction,
3658 when we do "s" in a function with no line numbers,
3659 or can this happen as a result of a return or longjmp?). */
3661 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3662 ecs
->event_thread
->stop_step
= 1;
3663 print_stop_reason (END_STEPPING_RANGE
, 0);
3664 stop_stepping (ecs
);
3668 if ((stop_pc
== stop_pc_sal
.pc
)
3669 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
3670 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
3672 /* We are at the start of a different line. So stop. Note that
3673 we don't stop if we step into the middle of a different line.
3674 That is said to make things like for (;;) statements work
3677 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3678 ecs
->event_thread
->stop_step
= 1;
3679 print_stop_reason (END_STEPPING_RANGE
, 0);
3680 stop_stepping (ecs
);
3684 /* We aren't done stepping.
3686 Optimize by setting the stepping range to the line.
3687 (We might not be in the original line, but if we entered a
3688 new line in mid-statement, we continue stepping. This makes
3689 things like for(;;) statements work better.) */
3691 ecs
->event_thread
->step_range_start
= stop_pc_sal
.pc
;
3692 ecs
->event_thread
->step_range_end
= stop_pc_sal
.end
;
3693 ecs
->event_thread
->step_frame_id
= get_frame_id (get_current_frame ());
3694 ecs
->event_thread
->current_line
= stop_pc_sal
.line
;
3695 ecs
->event_thread
->current_symtab
= stop_pc_sal
.symtab
;
3698 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
3702 /* Are we in the middle of stepping? */
3705 currently_stepping_thread (struct thread_info
*tp
)
3707 return (tp
->step_range_end
&& tp
->step_resume_breakpoint
== NULL
)
3708 || tp
->trap_expected
3709 || tp
->stepping_through_solib_after_catch
;
3713 currently_stepping_callback (struct thread_info
*tp
, void *data
)
3715 /* Return true if any thread *but* the one passed in "data" is
3716 in the middle of stepping. */
3717 return tp
!= data
&& currently_stepping_thread (tp
);
3721 currently_stepping (struct thread_info
*tp
)
3723 return currently_stepping_thread (tp
) || bpstat_should_step ();
3726 /* Inferior has stepped into a subroutine call with source code that
3727 we should not step over. Do step to the first line of code in
3731 handle_step_into_function (struct execution_control_state
*ecs
)
3734 struct symtab_and_line stop_func_sal
, sr_sal
;
3736 s
= find_pc_symtab (stop_pc
);
3737 if (s
&& s
->language
!= language_asm
)
3738 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3739 ecs
->stop_func_start
);
3741 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3742 /* Use the step_resume_break to step until the end of the prologue,
3743 even if that involves jumps (as it seems to on the vax under
3745 /* If the prologue ends in the middle of a source line, continue to
3746 the end of that source line (if it is still within the function).
3747 Otherwise, just go to end of prologue. */
3748 if (stop_func_sal
.end
3749 && stop_func_sal
.pc
!= ecs
->stop_func_start
3750 && stop_func_sal
.end
< ecs
->stop_func_end
)
3751 ecs
->stop_func_start
= stop_func_sal
.end
;
3753 /* Architectures which require breakpoint adjustment might not be able
3754 to place a breakpoint at the computed address. If so, the test
3755 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
3756 ecs->stop_func_start to an address at which a breakpoint may be
3757 legitimately placed.
3759 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
3760 made, GDB will enter an infinite loop when stepping through
3761 optimized code consisting of VLIW instructions which contain
3762 subinstructions corresponding to different source lines. On
3763 FR-V, it's not permitted to place a breakpoint on any but the
3764 first subinstruction of a VLIW instruction. When a breakpoint is
3765 set, GDB will adjust the breakpoint address to the beginning of
3766 the VLIW instruction. Thus, we need to make the corresponding
3767 adjustment here when computing the stop address. */
3769 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
3771 ecs
->stop_func_start
3772 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
3773 ecs
->stop_func_start
);
3776 if (ecs
->stop_func_start
== stop_pc
)
3778 /* We are already there: stop now. */
3779 ecs
->event_thread
->stop_step
= 1;
3780 print_stop_reason (END_STEPPING_RANGE
, 0);
3781 stop_stepping (ecs
);
3786 /* Put the step-breakpoint there and go until there. */
3787 init_sal (&sr_sal
); /* initialize to zeroes */
3788 sr_sal
.pc
= ecs
->stop_func_start
;
3789 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3791 /* Do not specify what the fp should be when we stop since on
3792 some machines the prologue is where the new fp value is
3794 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3796 /* And make sure stepping stops right away then. */
3797 ecs
->event_thread
->step_range_end
= ecs
->event_thread
->step_range_start
;
3802 /* Inferior has stepped backward into a subroutine call with source
3803 code that we should not step over. Do step to the beginning of the
3804 last line of code in it. */
3807 handle_step_into_function_backward (struct execution_control_state
*ecs
)
3810 struct symtab_and_line stop_func_sal
, sr_sal
;
3812 s
= find_pc_symtab (stop_pc
);
3813 if (s
&& s
->language
!= language_asm
)
3814 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3815 ecs
->stop_func_start
);
3817 stop_func_sal
= find_pc_line (stop_pc
, 0);
3819 /* OK, we're just going to keep stepping here. */
3820 if (stop_func_sal
.pc
== stop_pc
)
3822 /* We're there already. Just stop stepping now. */
3823 ecs
->event_thread
->stop_step
= 1;
3824 print_stop_reason (END_STEPPING_RANGE
, 0);
3825 stop_stepping (ecs
);
3829 /* Else just reset the step range and keep going.
3830 No step-resume breakpoint, they don't work for
3831 epilogues, which can have multiple entry paths. */
3832 ecs
->event_thread
->step_range_start
= stop_func_sal
.pc
;
3833 ecs
->event_thread
->step_range_end
= stop_func_sal
.end
;
3839 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
3840 This is used to both functions and to skip over code. */
3843 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
3844 struct frame_id sr_id
)
3846 /* There should never be more than one step-resume or longjmp-resume
3847 breakpoint per thread, so we should never be setting a new
3848 step_resume_breakpoint when one is already active. */
3849 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3852 fprintf_unfiltered (gdb_stdlog
,
3853 "infrun: inserting step-resume breakpoint at 0x%s\n",
3854 paddr_nz (sr_sal
.pc
));
3856 inferior_thread ()->step_resume_breakpoint
3857 = set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
3860 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
3861 to skip a potential signal handler.
3863 This is called with the interrupted function's frame. The signal
3864 handler, when it returns, will resume the interrupted function at
3868 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
3870 struct symtab_and_line sr_sal
;
3872 gdb_assert (return_frame
!= NULL
);
3873 init_sal (&sr_sal
); /* initialize to zeros */
3875 sr_sal
.pc
= gdbarch_addr_bits_remove
3876 (current_gdbarch
, get_frame_pc (return_frame
));
3877 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3879 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
3882 /* Similar to insert_step_resume_breakpoint_at_frame, except
3883 but a breakpoint at the previous frame's PC. This is used to
3884 skip a function after stepping into it (for "next" or if the called
3885 function has no debugging information).
3887 The current function has almost always been reached by single
3888 stepping a call or return instruction. NEXT_FRAME belongs to the
3889 current function, and the breakpoint will be set at the caller's
3892 This is a separate function rather than reusing
3893 insert_step_resume_breakpoint_at_frame in order to avoid
3894 get_prev_frame, which may stop prematurely (see the implementation
3895 of frame_unwind_id for an example). */
3898 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
3900 struct symtab_and_line sr_sal
;
3902 /* We shouldn't have gotten here if we don't know where the call site
3904 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
3906 init_sal (&sr_sal
); /* initialize to zeros */
3908 sr_sal
.pc
= gdbarch_addr_bits_remove
3909 (current_gdbarch
, frame_pc_unwind (next_frame
));
3910 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3912 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
3915 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
3916 new breakpoint at the target of a jmp_buf. The handling of
3917 longjmp-resume uses the same mechanisms used for handling
3918 "step-resume" breakpoints. */
3921 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
3923 /* There should never be more than one step-resume or longjmp-resume
3924 breakpoint per thread, so we should never be setting a new
3925 longjmp_resume_breakpoint when one is already active. */
3926 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3929 fprintf_unfiltered (gdb_stdlog
,
3930 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
3933 inferior_thread ()->step_resume_breakpoint
=
3934 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
3938 stop_stepping (struct execution_control_state
*ecs
)
3941 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
3943 /* Let callers know we don't want to wait for the inferior anymore. */
3944 ecs
->wait_some_more
= 0;
3947 /* This function handles various cases where we need to continue
3948 waiting for the inferior. */
3949 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3952 keep_going (struct execution_control_state
*ecs
)
3954 /* Save the pc before execution, to compare with pc after stop. */
3955 ecs
->event_thread
->prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
3957 /* If we did not do break;, it means we should keep running the
3958 inferior and not return to debugger. */
3960 if (ecs
->event_thread
->trap_expected
3961 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
3963 /* We took a signal (which we are supposed to pass through to
3964 the inferior, else we'd not get here) and we haven't yet
3965 gotten our trap. Simply continue. */
3966 resume (currently_stepping (ecs
->event_thread
),
3967 ecs
->event_thread
->stop_signal
);
3971 /* Either the trap was not expected, but we are continuing
3972 anyway (the user asked that this signal be passed to the
3975 The signal was SIGTRAP, e.g. it was our signal, but we
3976 decided we should resume from it.
3978 We're going to run this baby now!
3980 Note that insert_breakpoints won't try to re-insert
3981 already inserted breakpoints. Therefore, we don't
3982 care if breakpoints were already inserted, or not. */
3984 if (ecs
->event_thread
->stepping_over_breakpoint
)
3986 if (! use_displaced_stepping (current_gdbarch
))
3987 /* Since we can't do a displaced step, we have to remove
3988 the breakpoint while we step it. To keep things
3989 simple, we remove them all. */
3990 remove_breakpoints ();
3994 struct gdb_exception e
;
3995 /* Stop stepping when inserting breakpoints
3997 TRY_CATCH (e
, RETURN_MASK_ERROR
)
3999 insert_breakpoints ();
4003 stop_stepping (ecs
);
4008 ecs
->event_thread
->trap_expected
= ecs
->event_thread
->stepping_over_breakpoint
;
4010 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
4011 specifies that such a signal should be delivered to the
4014 Typically, this would occure when a user is debugging a
4015 target monitor on a simulator: the target monitor sets a
4016 breakpoint; the simulator encounters this break-point and
4017 halts the simulation handing control to GDB; GDB, noteing
4018 that the break-point isn't valid, returns control back to the
4019 simulator; the simulator then delivers the hardware
4020 equivalent of a SIGNAL_TRAP to the program being debugged. */
4022 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
4023 && !signal_program
[ecs
->event_thread
->stop_signal
])
4024 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
4026 resume (currently_stepping (ecs
->event_thread
),
4027 ecs
->event_thread
->stop_signal
);
4030 prepare_to_wait (ecs
);
4033 /* This function normally comes after a resume, before
4034 handle_inferior_event exits. It takes care of any last bits of
4035 housekeeping, and sets the all-important wait_some_more flag. */
4038 prepare_to_wait (struct execution_control_state
*ecs
)
4041 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
4042 if (infwait_state
== infwait_normal_state
)
4044 overlay_cache_invalid
= 1;
4046 /* We have to invalidate the registers BEFORE calling
4047 target_wait because they can be loaded from the target while
4048 in target_wait. This makes remote debugging a bit more
4049 efficient for those targets that provide critical registers
4050 as part of their normal status mechanism. */
4052 registers_changed ();
4053 waiton_ptid
= pid_to_ptid (-1);
4055 /* This is the old end of the while loop. Let everybody know we
4056 want to wait for the inferior some more and get called again
4058 ecs
->wait_some_more
= 1;
4061 /* Print why the inferior has stopped. We always print something when
4062 the inferior exits, or receives a signal. The rest of the cases are
4063 dealt with later on in normal_stop() and print_it_typical(). Ideally
4064 there should be a call to this function from handle_inferior_event()
4065 each time stop_stepping() is called.*/
4067 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
4069 switch (stop_reason
)
4071 case END_STEPPING_RANGE
:
4072 /* We are done with a step/next/si/ni command. */
4073 /* For now print nothing. */
4074 /* Print a message only if not in the middle of doing a "step n"
4075 operation for n > 1 */
4076 if (!inferior_thread ()->step_multi
4077 || !inferior_thread ()->stop_step
)
4078 if (ui_out_is_mi_like_p (uiout
))
4081 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
4084 /* The inferior was terminated by a signal. */
4085 annotate_signalled ();
4086 if (ui_out_is_mi_like_p (uiout
))
4089 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
4090 ui_out_text (uiout
, "\nProgram terminated with signal ");
4091 annotate_signal_name ();
4092 ui_out_field_string (uiout
, "signal-name",
4093 target_signal_to_name (stop_info
));
4094 annotate_signal_name_end ();
4095 ui_out_text (uiout
, ", ");
4096 annotate_signal_string ();
4097 ui_out_field_string (uiout
, "signal-meaning",
4098 target_signal_to_string (stop_info
));
4099 annotate_signal_string_end ();
4100 ui_out_text (uiout
, ".\n");
4101 ui_out_text (uiout
, "The program no longer exists.\n");
4104 /* The inferior program is finished. */
4105 annotate_exited (stop_info
);
4108 if (ui_out_is_mi_like_p (uiout
))
4109 ui_out_field_string (uiout
, "reason",
4110 async_reason_lookup (EXEC_ASYNC_EXITED
));
4111 ui_out_text (uiout
, "\nProgram exited with code ");
4112 ui_out_field_fmt (uiout
, "exit-code", "0%o",
4113 (unsigned int) stop_info
);
4114 ui_out_text (uiout
, ".\n");
4118 if (ui_out_is_mi_like_p (uiout
))
4121 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
4122 ui_out_text (uiout
, "\nProgram exited normally.\n");
4124 /* Support the --return-child-result option. */
4125 return_child_result_value
= stop_info
;
4127 case SIGNAL_RECEIVED
:
4128 /* Signal received. The signal table tells us to print about
4132 if (stop_info
== TARGET_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
4134 struct thread_info
*t
= inferior_thread ();
4136 ui_out_text (uiout
, "\n[");
4137 ui_out_field_string (uiout
, "thread-name",
4138 target_pid_to_str (t
->ptid
));
4139 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
4140 ui_out_text (uiout
, " stopped");
4144 ui_out_text (uiout
, "\nProgram received signal ");
4145 annotate_signal_name ();
4146 if (ui_out_is_mi_like_p (uiout
))
4148 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
4149 ui_out_field_string (uiout
, "signal-name",
4150 target_signal_to_name (stop_info
));
4151 annotate_signal_name_end ();
4152 ui_out_text (uiout
, ", ");
4153 annotate_signal_string ();
4154 ui_out_field_string (uiout
, "signal-meaning",
4155 target_signal_to_string (stop_info
));
4156 annotate_signal_string_end ();
4158 ui_out_text (uiout
, ".\n");
4161 /* Reverse execution: target ran out of history info. */
4162 ui_out_text (uiout
, "\nNo more reverse-execution history.\n");
4165 internal_error (__FILE__
, __LINE__
,
4166 _("print_stop_reason: unrecognized enum value"));
4172 /* Here to return control to GDB when the inferior stops for real.
4173 Print appropriate messages, remove breakpoints, give terminal our modes.
4175 STOP_PRINT_FRAME nonzero means print the executing frame
4176 (pc, function, args, file, line number and line text).
4177 BREAKPOINTS_FAILED nonzero means stop was due to error
4178 attempting to insert breakpoints. */
4183 struct target_waitstatus last
;
4185 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
4187 get_last_target_status (&last_ptid
, &last
);
4189 /* If an exception is thrown from this point on, make sure to
4190 propagate GDB's knowledge of the executing state to the
4191 frontend/user running state. A QUIT is an easy exception to see
4192 here, so do this before any filtered output. */
4193 if (target_has_execution
)
4196 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
4197 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4198 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4199 old_chain
= make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
4202 /* In non-stop mode, we don't want GDB to switch threads behind the
4203 user's back, to avoid races where the user is typing a command to
4204 apply to thread x, but GDB switches to thread y before the user
4205 finishes entering the command. */
4207 /* As with the notification of thread events, we want to delay
4208 notifying the user that we've switched thread context until
4209 the inferior actually stops.
4211 There's no point in saying anything if the inferior has exited.
4212 Note that SIGNALLED here means "exited with a signal", not
4213 "received a signal". */
4215 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
4216 && target_has_execution
4217 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4218 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4220 target_terminal_ours_for_output ();
4221 printf_filtered (_("[Switching to %s]\n"),
4222 target_pid_to_str (inferior_ptid
));
4223 annotate_thread_changed ();
4224 previous_inferior_ptid
= inferior_ptid
;
4227 /* NOTE drow/2004-01-17: Is this still necessary? */
4228 /* Make sure that the current_frame's pc is correct. This
4229 is a correction for setting up the frame info before doing
4230 gdbarch_decr_pc_after_break */
4231 if (target_has_execution
)
4232 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
4233 gdbarch_decr_pc_after_break, the program counter can change. Ask the
4234 frame code to check for this and sort out any resultant mess.
4235 gdbarch_decr_pc_after_break needs to just go away. */
4236 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
4238 if (!breakpoints_always_inserted_mode () && target_has_execution
)
4240 if (remove_breakpoints ())
4242 target_terminal_ours_for_output ();
4243 printf_filtered (_("\
4244 Cannot remove breakpoints because program is no longer writable.\n\
4245 Further execution is probably impossible.\n"));
4249 /* If an auto-display called a function and that got a signal,
4250 delete that auto-display to avoid an infinite recursion. */
4252 if (stopped_by_random_signal
)
4253 disable_current_display ();
4255 /* Don't print a message if in the middle of doing a "step n"
4256 operation for n > 1 */
4257 if (target_has_execution
4258 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4259 && last
.kind
!= TARGET_WAITKIND_EXITED
4260 && inferior_thread ()->step_multi
4261 && inferior_thread ()->stop_step
)
4264 target_terminal_ours ();
4266 /* Set the current source location. This will also happen if we
4267 display the frame below, but the current SAL will be incorrect
4268 during a user hook-stop function. */
4269 if (target_has_stack
&& !stop_stack_dummy
)
4270 set_current_sal_from_frame (get_current_frame (), 1);
4272 if (!target_has_stack
)
4275 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
4276 || last
.kind
== TARGET_WAITKIND_EXITED
)
4279 /* Select innermost stack frame - i.e., current frame is frame 0,
4280 and current location is based on that.
4281 Don't do this on return from a stack dummy routine,
4282 or if the program has exited. */
4284 if (!stop_stack_dummy
)
4286 select_frame (get_current_frame ());
4288 /* Print current location without a level number, if
4289 we have changed functions or hit a breakpoint.
4290 Print source line if we have one.
4291 bpstat_print() contains the logic deciding in detail
4292 what to print, based on the event(s) that just occurred. */
4294 /* If --batch-silent is enabled then there's no need to print the current
4295 source location, and to try risks causing an error message about
4296 missing source files. */
4297 if (stop_print_frame
&& !batch_silent
)
4301 int do_frame_printing
= 1;
4302 struct thread_info
*tp
= inferior_thread ();
4304 bpstat_ret
= bpstat_print (tp
->stop_bpstat
);
4308 /* If we had hit a shared library event breakpoint,
4309 bpstat_print would print out this message. If we hit
4310 an OS-level shared library event, do the same
4312 if (last
.kind
== TARGET_WAITKIND_LOADED
)
4314 printf_filtered (_("Stopped due to shared library event\n"));
4315 source_flag
= SRC_LINE
; /* something bogus */
4316 do_frame_printing
= 0;
4320 /* FIXME: cagney/2002-12-01: Given that a frame ID does
4321 (or should) carry around the function and does (or
4322 should) use that when doing a frame comparison. */
4324 && frame_id_eq (tp
->step_frame_id
,
4325 get_frame_id (get_current_frame ()))
4326 && step_start_function
== find_pc_function (stop_pc
))
4327 source_flag
= SRC_LINE
; /* finished step, just print source line */
4329 source_flag
= SRC_AND_LOC
; /* print location and source line */
4331 case PRINT_SRC_AND_LOC
:
4332 source_flag
= SRC_AND_LOC
; /* print location and source line */
4334 case PRINT_SRC_ONLY
:
4335 source_flag
= SRC_LINE
;
4338 source_flag
= SRC_LINE
; /* something bogus */
4339 do_frame_printing
= 0;
4342 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
4345 if (ui_out_is_mi_like_p (uiout
))
4348 ui_out_field_int (uiout
, "thread-id",
4349 pid_to_thread_id (inferior_ptid
));
4352 struct cleanup
*back_to
= make_cleanup_ui_out_list_begin_end
4353 (uiout
, "stopped-threads");
4354 ui_out_field_int (uiout
, NULL
,
4355 pid_to_thread_id (inferior_ptid
));
4356 do_cleanups (back_to
);
4359 ui_out_field_string (uiout
, "stopped-threads", "all");
4361 /* The behavior of this routine with respect to the source
4363 SRC_LINE: Print only source line
4364 LOCATION: Print only location
4365 SRC_AND_LOC: Print location and source line */
4366 if (do_frame_printing
)
4367 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
4369 /* Display the auto-display expressions. */
4374 /* Save the function value return registers, if we care.
4375 We might be about to restore their previous contents. */
4376 if (inferior_thread ()->proceed_to_finish
)
4378 /* This should not be necessary. */
4380 regcache_xfree (stop_registers
);
4382 /* NB: The copy goes through to the target picking up the value of
4383 all the registers. */
4384 stop_registers
= regcache_dup (get_current_regcache ());
4387 if (stop_stack_dummy
)
4389 /* Pop the empty frame that contains the stack dummy.
4390 This also restores inferior state prior to the call
4391 (struct inferior_thread_state). */
4392 struct frame_info
*frame
= get_current_frame ();
4393 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
4395 /* frame_pop() calls reinit_frame_cache as the last thing it does
4396 which means there's currently no selected frame. We don't need
4397 to re-establish a selected frame if the dummy call returns normally,
4398 that will be done by restore_inferior_status. However, we do have
4399 to handle the case where the dummy call is returning after being
4400 stopped (e.g. the dummy call previously hit a breakpoint). We
4401 can't know which case we have so just always re-establish a
4402 selected frame here. */
4403 select_frame (get_current_frame ());
4407 annotate_stopped ();
4408 if (!suppress_stop_observer
4409 && !(target_has_execution
4410 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4411 && last
.kind
!= TARGET_WAITKIND_EXITED
4412 && inferior_thread ()->step_multi
))
4414 if (!ptid_equal (inferior_ptid
, null_ptid
))
4415 observer_notify_normal_stop (inferior_thread ()->stop_bpstat
);
4417 observer_notify_normal_stop (NULL
);
4420 if (target_has_execution
)
4422 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4423 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4424 /* Delete the breakpoint we stopped at, if it wants to be deleted.
4425 Delete any breakpoint that is to be deleted at the next stop. */
4426 breakpoint_auto_delete (inferior_thread ()->stop_bpstat
);
4429 /* Tell the frontend about the new thread states. */
4430 do_cleanups (old_chain
);
4432 /* Look up the hook_stop and run it (CLI internally handles problem
4433 of stop_command's pre-hook not existing). */
4435 catch_errors (hook_stop_stub
, stop_command
,
4436 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
4441 hook_stop_stub (void *cmd
)
4443 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
4448 signal_stop_state (int signo
)
4450 return signal_stop
[signo
];
4454 signal_print_state (int signo
)
4456 return signal_print
[signo
];
4460 signal_pass_state (int signo
)
4462 return signal_program
[signo
];
4466 signal_stop_update (int signo
, int state
)
4468 int ret
= signal_stop
[signo
];
4469 signal_stop
[signo
] = state
;
4474 signal_print_update (int signo
, int state
)
4476 int ret
= signal_print
[signo
];
4477 signal_print
[signo
] = state
;
4482 signal_pass_update (int signo
, int state
)
4484 int ret
= signal_program
[signo
];
4485 signal_program
[signo
] = state
;
4490 sig_print_header (void)
4492 printf_filtered (_("\
4493 Signal Stop\tPrint\tPass to program\tDescription\n"));
4497 sig_print_info (enum target_signal oursig
)
4499 const char *name
= target_signal_to_name (oursig
);
4500 int name_padding
= 13 - strlen (name
);
4502 if (name_padding
<= 0)
4505 printf_filtered ("%s", name
);
4506 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
4507 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
4508 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
4509 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
4510 printf_filtered ("%s\n", target_signal_to_string (oursig
));
4513 /* Specify how various signals in the inferior should be handled. */
4516 handle_command (char *args
, int from_tty
)
4519 int digits
, wordlen
;
4520 int sigfirst
, signum
, siglast
;
4521 enum target_signal oursig
;
4524 unsigned char *sigs
;
4525 struct cleanup
*old_chain
;
4529 error_no_arg (_("signal to handle"));
4532 /* Allocate and zero an array of flags for which signals to handle. */
4534 nsigs
= (int) TARGET_SIGNAL_LAST
;
4535 sigs
= (unsigned char *) alloca (nsigs
);
4536 memset (sigs
, 0, nsigs
);
4538 /* Break the command line up into args. */
4540 argv
= gdb_buildargv (args
);
4541 old_chain
= make_cleanup_freeargv (argv
);
4543 /* Walk through the args, looking for signal oursigs, signal names, and
4544 actions. Signal numbers and signal names may be interspersed with
4545 actions, with the actions being performed for all signals cumulatively
4546 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
4548 while (*argv
!= NULL
)
4550 wordlen
= strlen (*argv
);
4551 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
4555 sigfirst
= siglast
= -1;
4557 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
4559 /* Apply action to all signals except those used by the
4560 debugger. Silently skip those. */
4563 siglast
= nsigs
- 1;
4565 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
4567 SET_SIGS (nsigs
, sigs
, signal_stop
);
4568 SET_SIGS (nsigs
, sigs
, signal_print
);
4570 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
4572 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4574 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
4576 SET_SIGS (nsigs
, sigs
, signal_print
);
4578 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
4580 SET_SIGS (nsigs
, sigs
, signal_program
);
4582 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
4584 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4586 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
4588 SET_SIGS (nsigs
, sigs
, signal_program
);
4590 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
4592 UNSET_SIGS (nsigs
, sigs
, signal_print
);
4593 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4595 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
4597 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4599 else if (digits
> 0)
4601 /* It is numeric. The numeric signal refers to our own
4602 internal signal numbering from target.h, not to host/target
4603 signal number. This is a feature; users really should be
4604 using symbolic names anyway, and the common ones like
4605 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
4607 sigfirst
= siglast
= (int)
4608 target_signal_from_command (atoi (*argv
));
4609 if ((*argv
)[digits
] == '-')
4612 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
4614 if (sigfirst
> siglast
)
4616 /* Bet he didn't figure we'd think of this case... */
4624 oursig
= target_signal_from_name (*argv
);
4625 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
4627 sigfirst
= siglast
= (int) oursig
;
4631 /* Not a number and not a recognized flag word => complain. */
4632 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
4636 /* If any signal numbers or symbol names were found, set flags for
4637 which signals to apply actions to. */
4639 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
4641 switch ((enum target_signal
) signum
)
4643 case TARGET_SIGNAL_TRAP
:
4644 case TARGET_SIGNAL_INT
:
4645 if (!allsigs
&& !sigs
[signum
])
4647 if (query ("%s is used by the debugger.\n\
4648 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
4654 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4655 gdb_flush (gdb_stdout
);
4659 case TARGET_SIGNAL_0
:
4660 case TARGET_SIGNAL_DEFAULT
:
4661 case TARGET_SIGNAL_UNKNOWN
:
4662 /* Make sure that "all" doesn't print these. */
4673 for (signum
= 0; signum
< nsigs
; signum
++)
4676 target_notice_signals (inferior_ptid
);
4680 /* Show the results. */
4681 sig_print_header ();
4682 for (; signum
< nsigs
; signum
++)
4684 sig_print_info (signum
);
4690 do_cleanups (old_chain
);
4694 xdb_handle_command (char *args
, int from_tty
)
4697 struct cleanup
*old_chain
;
4700 error_no_arg (_("xdb command"));
4702 /* Break the command line up into args. */
4704 argv
= gdb_buildargv (args
);
4705 old_chain
= make_cleanup_freeargv (argv
);
4706 if (argv
[1] != (char *) NULL
)
4711 bufLen
= strlen (argv
[0]) + 20;
4712 argBuf
= (char *) xmalloc (bufLen
);
4716 enum target_signal oursig
;
4718 oursig
= target_signal_from_name (argv
[0]);
4719 memset (argBuf
, 0, bufLen
);
4720 if (strcmp (argv
[1], "Q") == 0)
4721 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4724 if (strcmp (argv
[1], "s") == 0)
4726 if (!signal_stop
[oursig
])
4727 sprintf (argBuf
, "%s %s", argv
[0], "stop");
4729 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
4731 else if (strcmp (argv
[1], "i") == 0)
4733 if (!signal_program
[oursig
])
4734 sprintf (argBuf
, "%s %s", argv
[0], "pass");
4736 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
4738 else if (strcmp (argv
[1], "r") == 0)
4740 if (!signal_print
[oursig
])
4741 sprintf (argBuf
, "%s %s", argv
[0], "print");
4743 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4749 handle_command (argBuf
, from_tty
);
4751 printf_filtered (_("Invalid signal handling flag.\n"));
4756 do_cleanups (old_chain
);
4759 /* Print current contents of the tables set by the handle command.
4760 It is possible we should just be printing signals actually used
4761 by the current target (but for things to work right when switching
4762 targets, all signals should be in the signal tables). */
4765 signals_info (char *signum_exp
, int from_tty
)
4767 enum target_signal oursig
;
4768 sig_print_header ();
4772 /* First see if this is a symbol name. */
4773 oursig
= target_signal_from_name (signum_exp
);
4774 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
4776 /* No, try numeric. */
4778 target_signal_from_command (parse_and_eval_long (signum_exp
));
4780 sig_print_info (oursig
);
4784 printf_filtered ("\n");
4785 /* These ugly casts brought to you by the native VAX compiler. */
4786 for (oursig
= TARGET_SIGNAL_FIRST
;
4787 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
4788 oursig
= (enum target_signal
) ((int) oursig
+ 1))
4792 if (oursig
!= TARGET_SIGNAL_UNKNOWN
4793 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
4794 sig_print_info (oursig
);
4797 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
4800 /* Inferior thread state.
4801 These are details related to the inferior itself, and don't include
4802 things like what frame the user had selected or what gdb was doing
4803 with the target at the time.
4804 For inferior function calls these are things we want to restore
4805 regardless of whether the function call successfully completes
4806 or the dummy frame has to be manually popped. */
4808 struct inferior_thread_state
4810 enum target_signal stop_signal
;
4812 struct regcache
*registers
;
4815 struct inferior_thread_state
*
4816 save_inferior_thread_state (void)
4818 struct inferior_thread_state
*inf_state
= XMALLOC (struct inferior_thread_state
);
4819 struct thread_info
*tp
= inferior_thread ();
4821 inf_state
->stop_signal
= tp
->stop_signal
;
4822 inf_state
->stop_pc
= stop_pc
;
4824 inf_state
->registers
= regcache_dup (get_current_regcache ());
4829 /* Restore inferior session state to INF_STATE. */
4832 restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
4834 struct thread_info
*tp
= inferior_thread ();
4836 tp
->stop_signal
= inf_state
->stop_signal
;
4837 stop_pc
= inf_state
->stop_pc
;
4839 /* The inferior can be gone if the user types "print exit(0)"
4840 (and perhaps other times). */
4841 if (target_has_execution
)
4842 /* NB: The register write goes through to the target. */
4843 regcache_cpy (get_current_regcache (), inf_state
->registers
);
4844 regcache_xfree (inf_state
->registers
);
4849 do_restore_inferior_thread_state_cleanup (void *state
)
4851 restore_inferior_thread_state (state
);
4855 make_cleanup_restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
4857 return make_cleanup (do_restore_inferior_thread_state_cleanup
, inf_state
);
4861 discard_inferior_thread_state (struct inferior_thread_state
*inf_state
)
4863 regcache_xfree (inf_state
->registers
);
4868 get_inferior_thread_state_regcache (struct inferior_thread_state
*inf_state
)
4870 return inf_state
->registers
;
4873 /* Session related state for inferior function calls.
4874 These are the additional bits of state that need to be restored
4875 when an inferior function call successfully completes. */
4877 struct inferior_status
4881 int stop_stack_dummy
;
4882 int stopped_by_random_signal
;
4883 int stepping_over_breakpoint
;
4884 CORE_ADDR step_range_start
;
4885 CORE_ADDR step_range_end
;
4886 struct frame_id step_frame_id
;
4887 enum step_over_calls_kind step_over_calls
;
4888 CORE_ADDR step_resume_break_address
;
4889 int stop_after_trap
;
4892 /* ID if the selected frame when the inferior function call was made. */
4893 struct frame_id selected_frame_id
;
4895 int breakpoint_proceeded
;
4896 int proceed_to_finish
;
4899 /* Save all of the information associated with the inferior<==>gdb
4902 struct inferior_status
*
4903 save_inferior_status (void)
4905 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
4906 struct thread_info
*tp
= inferior_thread ();
4907 struct inferior
*inf
= current_inferior ();
4909 inf_status
->stop_step
= tp
->stop_step
;
4910 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
4911 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
4912 inf_status
->stepping_over_breakpoint
= tp
->trap_expected
;
4913 inf_status
->step_range_start
= tp
->step_range_start
;
4914 inf_status
->step_range_end
= tp
->step_range_end
;
4915 inf_status
->step_frame_id
= tp
->step_frame_id
;
4916 inf_status
->step_over_calls
= tp
->step_over_calls
;
4917 inf_status
->stop_after_trap
= stop_after_trap
;
4918 inf_status
->stop_soon
= inf
->stop_soon
;
4919 /* Save original bpstat chain here; replace it with copy of chain.
4920 If caller's caller is walking the chain, they'll be happier if we
4921 hand them back the original chain when restore_inferior_status is
4923 inf_status
->stop_bpstat
= tp
->stop_bpstat
;
4924 tp
->stop_bpstat
= bpstat_copy (tp
->stop_bpstat
);
4925 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
4926 inf_status
->proceed_to_finish
= tp
->proceed_to_finish
;
4928 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
4934 restore_selected_frame (void *args
)
4936 struct frame_id
*fid
= (struct frame_id
*) args
;
4937 struct frame_info
*frame
;
4939 frame
= frame_find_by_id (*fid
);
4941 /* If inf_status->selected_frame_id is NULL, there was no previously
4945 warning (_("Unable to restore previously selected frame."));
4949 select_frame (frame
);
4954 /* Restore inferior session state to INF_STATUS. */
4957 restore_inferior_status (struct inferior_status
*inf_status
)
4959 struct thread_info
*tp
= inferior_thread ();
4960 struct inferior
*inf
= current_inferior ();
4962 tp
->stop_step
= inf_status
->stop_step
;
4963 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
4964 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
4965 tp
->trap_expected
= inf_status
->stepping_over_breakpoint
;
4966 tp
->step_range_start
= inf_status
->step_range_start
;
4967 tp
->step_range_end
= inf_status
->step_range_end
;
4968 tp
->step_frame_id
= inf_status
->step_frame_id
;
4969 tp
->step_over_calls
= inf_status
->step_over_calls
;
4970 stop_after_trap
= inf_status
->stop_after_trap
;
4971 inf
->stop_soon
= inf_status
->stop_soon
;
4972 bpstat_clear (&tp
->stop_bpstat
);
4973 tp
->stop_bpstat
= inf_status
->stop_bpstat
;
4974 inf_status
->stop_bpstat
= NULL
;
4975 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
4976 tp
->proceed_to_finish
= inf_status
->proceed_to_finish
;
4978 if (target_has_stack
)
4980 /* The point of catch_errors is that if the stack is clobbered,
4981 walking the stack might encounter a garbage pointer and
4982 error() trying to dereference it. */
4984 (restore_selected_frame
, &inf_status
->selected_frame_id
,
4985 "Unable to restore previously selected frame:\n",
4986 RETURN_MASK_ERROR
) == 0)
4987 /* Error in restoring the selected frame. Select the innermost
4989 select_frame (get_current_frame ());
4996 do_restore_inferior_status_cleanup (void *sts
)
4998 restore_inferior_status (sts
);
5002 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
5004 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
5008 discard_inferior_status (struct inferior_status
*inf_status
)
5010 /* See save_inferior_status for info on stop_bpstat. */
5011 bpstat_clear (&inf_status
->stop_bpstat
);
5016 inferior_has_forked (ptid_t pid
, ptid_t
*child_pid
)
5018 struct target_waitstatus last
;
5021 get_last_target_status (&last_ptid
, &last
);
5023 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
5026 if (!ptid_equal (last_ptid
, pid
))
5029 *child_pid
= last
.value
.related_pid
;
5034 inferior_has_vforked (ptid_t pid
, ptid_t
*child_pid
)
5036 struct target_waitstatus last
;
5039 get_last_target_status (&last_ptid
, &last
);
5041 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
5044 if (!ptid_equal (last_ptid
, pid
))
5047 *child_pid
= last
.value
.related_pid
;
5052 inferior_has_execd (ptid_t pid
, char **execd_pathname
)
5054 struct target_waitstatus last
;
5057 get_last_target_status (&last_ptid
, &last
);
5059 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
5062 if (!ptid_equal (last_ptid
, pid
))
5065 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
5069 /* Oft used ptids */
5071 ptid_t minus_one_ptid
;
5073 /* Create a ptid given the necessary PID, LWP, and TID components. */
5076 ptid_build (int pid
, long lwp
, long tid
)
5086 /* Create a ptid from just a pid. */
5089 pid_to_ptid (int pid
)
5091 return ptid_build (pid
, 0, 0);
5094 /* Fetch the pid (process id) component from a ptid. */
5097 ptid_get_pid (ptid_t ptid
)
5102 /* Fetch the lwp (lightweight process) component from a ptid. */
5105 ptid_get_lwp (ptid_t ptid
)
5110 /* Fetch the tid (thread id) component from a ptid. */
5113 ptid_get_tid (ptid_t ptid
)
5118 /* ptid_equal() is used to test equality of two ptids. */
5121 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
5123 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
5124 && ptid1
.tid
== ptid2
.tid
);
5127 /* Returns true if PTID represents a process. */
5130 ptid_is_pid (ptid_t ptid
)
5132 if (ptid_equal (minus_one_ptid
, ptid
))
5134 if (ptid_equal (null_ptid
, ptid
))
5137 return (ptid_get_lwp (ptid
) == 0 && ptid_get_tid (ptid
) == 0);
5140 /* restore_inferior_ptid() will be used by the cleanup machinery
5141 to restore the inferior_ptid value saved in a call to
5142 save_inferior_ptid(). */
5145 restore_inferior_ptid (void *arg
)
5147 ptid_t
*saved_ptid_ptr
= arg
;
5148 inferior_ptid
= *saved_ptid_ptr
;
5152 /* Save the value of inferior_ptid so that it may be restored by a
5153 later call to do_cleanups(). Returns the struct cleanup pointer
5154 needed for later doing the cleanup. */
5157 save_inferior_ptid (void)
5159 ptid_t
*saved_ptid_ptr
;
5161 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
5162 *saved_ptid_ptr
= inferior_ptid
;
5163 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
5167 /* User interface for reverse debugging:
5168 Set exec-direction / show exec-direction commands
5169 (returns error unless target implements to_set_exec_direction method). */
5171 enum exec_direction_kind execution_direction
= EXEC_FORWARD
;
5172 static const char exec_forward
[] = "forward";
5173 static const char exec_reverse
[] = "reverse";
5174 static const char *exec_direction
= exec_forward
;
5175 static const char *exec_direction_names
[] = {
5182 set_exec_direction_func (char *args
, int from_tty
,
5183 struct cmd_list_element
*cmd
)
5185 if (target_can_execute_reverse
)
5187 if (!strcmp (exec_direction
, exec_forward
))
5188 execution_direction
= EXEC_FORWARD
;
5189 else if (!strcmp (exec_direction
, exec_reverse
))
5190 execution_direction
= EXEC_REVERSE
;
5195 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
5196 struct cmd_list_element
*cmd
, const char *value
)
5198 switch (execution_direction
) {
5200 fprintf_filtered (out
, _("Forward.\n"));
5203 fprintf_filtered (out
, _("Reverse.\n"));
5207 fprintf_filtered (out
,
5208 _("Forward (target `%s' does not support exec-direction).\n"),
5214 /* User interface for non-stop mode. */
5217 static int non_stop_1
= 0;
5220 set_non_stop (char *args
, int from_tty
,
5221 struct cmd_list_element
*c
)
5223 if (target_has_execution
)
5225 non_stop_1
= non_stop
;
5226 error (_("Cannot change this setting while the inferior is running."));
5229 non_stop
= non_stop_1
;
5233 show_non_stop (struct ui_file
*file
, int from_tty
,
5234 struct cmd_list_element
*c
, const char *value
)
5236 fprintf_filtered (file
,
5237 _("Controlling the inferior in non-stop mode is %s.\n"),
5243 _initialize_infrun (void)
5247 struct cmd_list_element
*c
;
5249 add_info ("signals", signals_info
, _("\
5250 What debugger does when program gets various signals.\n\
5251 Specify a signal as argument to print info on that signal only."));
5252 add_info_alias ("handle", "signals", 0);
5254 add_com ("handle", class_run
, handle_command
, _("\
5255 Specify how to handle a signal.\n\
5256 Args are signals and actions to apply to those signals.\n\
5257 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5258 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5259 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5260 The special arg \"all\" is recognized to mean all signals except those\n\
5261 used by the debugger, typically SIGTRAP and SIGINT.\n\
5262 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
5263 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
5264 Stop means reenter debugger if this signal happens (implies print).\n\
5265 Print means print a message if this signal happens.\n\
5266 Pass means let program see this signal; otherwise program doesn't know.\n\
5267 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5268 Pass and Stop may be combined."));
5271 add_com ("lz", class_info
, signals_info
, _("\
5272 What debugger does when program gets various signals.\n\
5273 Specify a signal as argument to print info on that signal only."));
5274 add_com ("z", class_run
, xdb_handle_command
, _("\
5275 Specify how to handle a signal.\n\
5276 Args are signals and actions to apply to those signals.\n\
5277 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5278 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5279 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5280 The special arg \"all\" is recognized to mean all signals except those\n\
5281 used by the debugger, typically SIGTRAP and SIGINT.\n\
5282 Recognized actions include \"s\" (toggles between stop and nostop), \n\
5283 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
5284 nopass), \"Q\" (noprint)\n\
5285 Stop means reenter debugger if this signal happens (implies print).\n\
5286 Print means print a message if this signal happens.\n\
5287 Pass means let program see this signal; otherwise program doesn't know.\n\
5288 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5289 Pass and Stop may be combined."));
5293 stop_command
= add_cmd ("stop", class_obscure
,
5294 not_just_help_class_command
, _("\
5295 There is no `stop' command, but you can set a hook on `stop'.\n\
5296 This allows you to set a list of commands to be run each time execution\n\
5297 of the program stops."), &cmdlist
);
5299 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
5300 Set inferior debugging."), _("\
5301 Show inferior debugging."), _("\
5302 When non-zero, inferior specific debugging is enabled."),
5305 &setdebuglist
, &showdebuglist
);
5307 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
5308 Set displaced stepping debugging."), _("\
5309 Show displaced stepping debugging."), _("\
5310 When non-zero, displaced stepping specific debugging is enabled."),
5312 show_debug_displaced
,
5313 &setdebuglist
, &showdebuglist
);
5315 add_setshow_boolean_cmd ("non-stop", no_class
,
5317 Set whether gdb controls the inferior in non-stop mode."), _("\
5318 Show whether gdb controls the inferior in non-stop mode."), _("\
5319 When debugging a multi-threaded program and this setting is\n\
5320 off (the default, also called all-stop mode), when one thread stops\n\
5321 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
5322 all other threads in the program while you interact with the thread of\n\
5323 interest. When you continue or step a thread, you can allow the other\n\
5324 threads to run, or have them remain stopped, but while you inspect any\n\
5325 thread's state, all threads stop.\n\
5327 In non-stop mode, when one thread stops, other threads can continue\n\
5328 to run freely. You'll be able to step each thread independently,\n\
5329 leave it stopped or free to run as needed."),
5335 numsigs
= (int) TARGET_SIGNAL_LAST
;
5336 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
5337 signal_print
= (unsigned char *)
5338 xmalloc (sizeof (signal_print
[0]) * numsigs
);
5339 signal_program
= (unsigned char *)
5340 xmalloc (sizeof (signal_program
[0]) * numsigs
);
5341 for (i
= 0; i
< numsigs
; i
++)
5344 signal_print
[i
] = 1;
5345 signal_program
[i
] = 1;
5348 /* Signals caused by debugger's own actions
5349 should not be given to the program afterwards. */
5350 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
5351 signal_program
[TARGET_SIGNAL_INT
] = 0;
5353 /* Signals that are not errors should not normally enter the debugger. */
5354 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
5355 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
5356 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
5357 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
5358 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
5359 signal_print
[TARGET_SIGNAL_PROF
] = 0;
5360 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
5361 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
5362 signal_stop
[TARGET_SIGNAL_IO
] = 0;
5363 signal_print
[TARGET_SIGNAL_IO
] = 0;
5364 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
5365 signal_print
[TARGET_SIGNAL_POLL
] = 0;
5366 signal_stop
[TARGET_SIGNAL_URG
] = 0;
5367 signal_print
[TARGET_SIGNAL_URG
] = 0;
5368 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
5369 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
5371 /* These signals are used internally by user-level thread
5372 implementations. (See signal(5) on Solaris.) Like the above
5373 signals, a healthy program receives and handles them as part of
5374 its normal operation. */
5375 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
5376 signal_print
[TARGET_SIGNAL_LWP
] = 0;
5377 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
5378 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
5379 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
5380 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
5382 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
5383 &stop_on_solib_events
, _("\
5384 Set stopping for shared library events."), _("\
5385 Show stopping for shared library events."), _("\
5386 If nonzero, gdb will give control to the user when the dynamic linker\n\
5387 notifies gdb of shared library events. The most common event of interest\n\
5388 to the user would be loading/unloading of a new library."),
5390 show_stop_on_solib_events
,
5391 &setlist
, &showlist
);
5393 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
5394 follow_fork_mode_kind_names
,
5395 &follow_fork_mode_string
, _("\
5396 Set debugger response to a program call of fork or vfork."), _("\
5397 Show debugger response to a program call of fork or vfork."), _("\
5398 A fork or vfork creates a new process. follow-fork-mode can be:\n\
5399 parent - the original process is debugged after a fork\n\
5400 child - the new process is debugged after a fork\n\
5401 The unfollowed process will continue to run.\n\
5402 By default, the debugger will follow the parent process."),
5404 show_follow_fork_mode_string
,
5405 &setlist
, &showlist
);
5407 add_setshow_enum_cmd ("scheduler-locking", class_run
,
5408 scheduler_enums
, &scheduler_mode
, _("\
5409 Set mode for locking scheduler during execution."), _("\
5410 Show mode for locking scheduler during execution."), _("\
5411 off == no locking (threads may preempt at any time)\n\
5412 on == full locking (no thread except the current thread may run)\n\
5413 step == scheduler locked during every single-step operation.\n\
5414 In this mode, no other thread may run during a step command.\n\
5415 Other threads may run while stepping over a function call ('next')."),
5416 set_schedlock_func
, /* traps on target vector */
5417 show_scheduler_mode
,
5418 &setlist
, &showlist
);
5420 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
5421 Set mode of the step operation."), _("\
5422 Show mode of the step operation."), _("\
5423 When set, doing a step over a function without debug line information\n\
5424 will stop at the first instruction of that function. Otherwise, the\n\
5425 function is skipped and the step command stops at a different source line."),
5427 show_step_stop_if_no_debug
,
5428 &setlist
, &showlist
);
5430 add_setshow_enum_cmd ("displaced-stepping", class_run
,
5431 can_use_displaced_stepping_enum
,
5432 &can_use_displaced_stepping
, _("\
5433 Set debugger's willingness to use displaced stepping."), _("\
5434 Show debugger's willingness to use displaced stepping."), _("\
5435 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
5436 supported by the target architecture. If off, gdb will not use displaced\n\
5437 stepping to step over breakpoints, even if such is supported by the target\n\
5438 architecture. If auto (which is the default), gdb will use displaced stepping\n\
5439 if the target architecture supports it and non-stop mode is active, but will not\n\
5440 use it in all-stop mode (see help set non-stop)."),
5442 show_can_use_displaced_stepping
,
5443 &setlist
, &showlist
);
5445 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
5446 &exec_direction
, _("Set direction of execution.\n\
5447 Options are 'forward' or 'reverse'."),
5448 _("Show direction of execution (forward/reverse)."),
5449 _("Tells gdb whether to execute forward or backward."),
5450 set_exec_direction_func
, show_exec_direction_func
,
5451 &setlist
, &showlist
);
5453 /* ptid initializations */
5454 null_ptid
= ptid_build (0, 0, 0);
5455 minus_one_ptid
= ptid_build (-1, 0, 0);
5456 inferior_ptid
= null_ptid
;
5457 target_last_wait_ptid
= minus_one_ptid
;
5458 displaced_step_ptid
= null_ptid
;
5460 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
5461 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);