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
);
953 /* Try to setup for software single stepping over the specified location.
954 Return 1 if target_resume() should use hardware single step.
956 GDBARCH the current gdbarch.
957 PC the location to step over. */
960 maybe_software_singlestep (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
964 if (gdbarch_software_single_step_p (gdbarch
)
965 && gdbarch_software_single_step (gdbarch
, get_current_frame ()))
968 /* Do not pull these breakpoints until after a `wait' in
969 `wait_for_inferior' */
970 singlestep_breakpoints_inserted_p
= 1;
971 singlestep_ptid
= inferior_ptid
;
977 /* Resume the inferior, but allow a QUIT. This is useful if the user
978 wants to interrupt some lengthy single-stepping operation
979 (for child processes, the SIGINT goes to the inferior, and so
980 we get a SIGINT random_signal, but for remote debugging and perhaps
981 other targets, that's not true).
983 STEP nonzero if we should step (zero to continue instead).
984 SIG is the signal to give the inferior (zero for none). */
986 resume (int step
, enum target_signal sig
)
988 int should_resume
= 1;
989 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
991 /* Note that these must be reset if we follow a fork below. */
992 struct regcache
*regcache
= get_current_regcache ();
993 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
994 struct thread_info
*tp
= inferior_thread ();
995 CORE_ADDR pc
= regcache_read_pc (regcache
);
1000 fprintf_unfiltered (gdb_stdlog
,
1001 "infrun: resume (step=%d, signal=%d), "
1002 "trap_expected=%d\n",
1003 step
, sig
, tp
->trap_expected
);
1005 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
1006 over an instruction that causes a page fault without triggering
1007 a hardware watchpoint. The kernel properly notices that it shouldn't
1008 stop, because the hardware watchpoint is not triggered, but it forgets
1009 the step request and continues the program normally.
1010 Work around the problem by removing hardware watchpoints if a step is
1011 requested, GDB will check for a hardware watchpoint trigger after the
1013 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
1014 remove_hw_watchpoints ();
1017 /* Normally, by the time we reach `resume', the breakpoints are either
1018 removed or inserted, as appropriate. The exception is if we're sitting
1019 at a permanent breakpoint; we need to step over it, but permanent
1020 breakpoints can't be removed. So we have to test for it here. */
1021 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
1023 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1024 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1027 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1028 how to step past a permanent breakpoint on this architecture. Try using\n\
1029 a command like `return' or `jump' to continue execution."));
1032 /* If enabled, step over breakpoints by executing a copy of the
1033 instruction at a different address.
1035 We can't use displaced stepping when we have a signal to deliver;
1036 the comments for displaced_step_prepare explain why. The
1037 comments in the handle_inferior event for dealing with 'random
1038 signals' explain what we do instead. */
1039 if (use_displaced_stepping (gdbarch
)
1040 && tp
->trap_expected
1041 && sig
== TARGET_SIGNAL_0
)
1043 if (!displaced_step_prepare (inferior_ptid
))
1045 /* Got placed in displaced stepping queue. Will be resumed
1046 later when all the currently queued displaced stepping
1047 requests finish. The thread is not executing at this point,
1048 and the call to set_executing will be made later. But we
1049 need to call set_running here, since from frontend point of view,
1050 the thread is running. */
1051 set_running (inferior_ptid
, 1);
1052 discard_cleanups (old_cleanups
);
1057 /* Do we need to do it the hard way, w/temp breakpoints? */
1059 step
= maybe_software_singlestep (gdbarch
, pc
);
1061 /* If there were any forks/vforks/execs that were caught and are
1062 now to be followed, then do so. */
1063 switch (pending_follow
.kind
)
1065 case TARGET_WAITKIND_FORKED
:
1066 case TARGET_WAITKIND_VFORKED
:
1067 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1071 /* Following a child fork will change our notion of current
1073 tp
= inferior_thread ();
1074 regcache
= get_current_regcache ();
1075 gdbarch
= get_regcache_arch (regcache
);
1076 pc
= regcache_read_pc (regcache
);
1079 case TARGET_WAITKIND_EXECD
:
1080 /* follow_exec is called as soon as the exec event is seen. */
1081 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1088 /* Install inferior's terminal modes. */
1089 target_terminal_inferior ();
1095 resume_ptid
= RESUME_ALL
; /* Default */
1097 /* If STEP is set, it's a request to use hardware stepping
1098 facilities. But in that case, we should never
1099 use singlestep breakpoint. */
1100 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1102 if (singlestep_breakpoints_inserted_p
1103 && stepping_past_singlestep_breakpoint
)
1105 /* The situation here is as follows. In thread T1 we wanted to
1106 single-step. Lacking hardware single-stepping we've
1107 set breakpoint at the PC of the next instruction -- call it
1108 P. After resuming, we've hit that breakpoint in thread T2.
1109 Now we've removed original breakpoint, inserted breakpoint
1110 at P+1, and try to step to advance T2 past breakpoint.
1111 We need to step only T2, as if T1 is allowed to freely run,
1112 it can run past P, and if other threads are allowed to run,
1113 they can hit breakpoint at P+1, and nested hits of single-step
1114 breakpoints is not something we'd want -- that's complicated
1115 to support, and has no value. */
1116 resume_ptid
= inferior_ptid
;
1119 if ((step
|| singlestep_breakpoints_inserted_p
)
1120 && tp
->trap_expected
)
1122 /* We're allowing a thread to run past a breakpoint it has
1123 hit, by single-stepping the thread with the breakpoint
1124 removed. In which case, we need to single-step only this
1125 thread, and keep others stopped, as they can miss this
1126 breakpoint if allowed to run.
1128 The current code actually removes all breakpoints when
1129 doing this, not just the one being stepped over, so if we
1130 let other threads run, we can actually miss any
1131 breakpoint, not just the one at PC. */
1132 resume_ptid
= inferior_ptid
;
1137 /* With non-stop mode on, threads are always handled
1139 resume_ptid
= inferior_ptid
;
1141 else if ((scheduler_mode
== schedlock_on
)
1142 || (scheduler_mode
== schedlock_step
1143 && (step
|| singlestep_breakpoints_inserted_p
)))
1145 /* User-settable 'scheduler' mode requires solo thread resume. */
1146 resume_ptid
= inferior_ptid
;
1149 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1151 /* Most targets can step a breakpoint instruction, thus
1152 executing it normally. But if this one cannot, just
1153 continue and we will hit it anyway. */
1154 if (step
&& breakpoint_inserted_here_p (pc
))
1159 && use_displaced_stepping (gdbarch
)
1160 && tp
->trap_expected
)
1162 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1163 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1166 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1167 paddr_nz (actual_pc
));
1168 read_memory (actual_pc
, buf
, sizeof (buf
));
1169 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1172 /* Avoid confusing the next resume, if the next stop/resume
1173 happens to apply to another thread. */
1174 tp
->stop_signal
= TARGET_SIGNAL_0
;
1176 target_resume (resume_ptid
, step
, sig
);
1179 discard_cleanups (old_cleanups
);
1184 /* Clear out all variables saying what to do when inferior is continued.
1185 First do this, then set the ones you want, then call `proceed'. */
1188 clear_proceed_status_thread (struct thread_info
*tp
)
1191 fprintf_unfiltered (gdb_stdlog
,
1192 "infrun: clear_proceed_status_thread (%s)\n",
1193 target_pid_to_str (tp
->ptid
));
1195 tp
->trap_expected
= 0;
1196 tp
->step_range_start
= 0;
1197 tp
->step_range_end
= 0;
1198 tp
->step_frame_id
= null_frame_id
;
1199 tp
->step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1200 tp
->stop_requested
= 0;
1204 tp
->proceed_to_finish
= 0;
1206 /* Discard any remaining commands or status from previous stop. */
1207 bpstat_clear (&tp
->stop_bpstat
);
1211 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
1213 if (is_exited (tp
->ptid
))
1216 clear_proceed_status_thread (tp
);
1221 clear_proceed_status (void)
1223 if (!ptid_equal (inferior_ptid
, null_ptid
))
1225 struct inferior
*inferior
;
1229 /* If in non-stop mode, only delete the per-thread status
1230 of the current thread. */
1231 clear_proceed_status_thread (inferior_thread ());
1235 /* In all-stop mode, delete the per-thread status of
1237 iterate_over_threads (clear_proceed_status_callback
, NULL
);
1240 inferior
= current_inferior ();
1241 inferior
->stop_soon
= NO_STOP_QUIETLY
;
1244 stop_after_trap
= 0;
1246 observer_notify_about_to_proceed ();
1250 regcache_xfree (stop_registers
);
1251 stop_registers
= NULL
;
1255 /* This should be suitable for any targets that support threads. */
1258 prepare_to_proceed (int step
)
1261 struct target_waitstatus wait_status
;
1263 /* Get the last target status returned by target_wait(). */
1264 get_last_target_status (&wait_ptid
, &wait_status
);
1266 /* Make sure we were stopped at a breakpoint. */
1267 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1268 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1273 /* Switched over from WAIT_PID. */
1274 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1275 && !ptid_equal (inferior_ptid
, wait_ptid
))
1277 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1279 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1281 /* If stepping, remember current thread to switch back to. */
1283 deferred_step_ptid
= inferior_ptid
;
1285 /* Switch back to WAIT_PID thread. */
1286 switch_to_thread (wait_ptid
);
1288 /* We return 1 to indicate that there is a breakpoint here,
1289 so we need to step over it before continuing to avoid
1290 hitting it straight away. */
1298 /* Basic routine for continuing the program in various fashions.
1300 ADDR is the address to resume at, or -1 for resume where stopped.
1301 SIGGNAL is the signal to give it, or 0 for none,
1302 or -1 for act according to how it stopped.
1303 STEP is nonzero if should trap after one instruction.
1304 -1 means return after that and print nothing.
1305 You should probably set various step_... variables
1306 before calling here, if you are stepping.
1308 You should call clear_proceed_status before calling proceed. */
1311 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1313 struct regcache
*regcache
= get_current_regcache ();
1314 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1315 struct thread_info
*tp
;
1316 CORE_ADDR pc
= regcache_read_pc (regcache
);
1320 step_start_function
= find_pc_function (pc
);
1322 stop_after_trap
= 1;
1324 if (addr
== (CORE_ADDR
) -1)
1326 if (pc
== stop_pc
&& breakpoint_here_p (pc
)
1327 && execution_direction
!= EXEC_REVERSE
)
1328 /* There is a breakpoint at the address we will resume at,
1329 step one instruction before inserting breakpoints so that
1330 we do not stop right away (and report a second hit at this
1333 Note, we don't do this in reverse, because we won't
1334 actually be executing the breakpoint insn anyway.
1335 We'll be (un-)executing the previous instruction. */
1338 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1339 && gdbarch_single_step_through_delay (gdbarch
,
1340 get_current_frame ()))
1341 /* We stepped onto an instruction that needs to be stepped
1342 again before re-inserting the breakpoint, do so. */
1347 regcache_write_pc (regcache
, addr
);
1351 fprintf_unfiltered (gdb_stdlog
,
1352 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1353 paddr_nz (addr
), siggnal
, step
);
1356 /* In non-stop, each thread is handled individually. The context
1357 must already be set to the right thread here. */
1361 /* In a multi-threaded task we may select another thread and
1362 then continue or step.
1364 But if the old thread was stopped at a breakpoint, it will
1365 immediately cause another breakpoint stop without any
1366 execution (i.e. it will report a breakpoint hit incorrectly).
1367 So we must step over it first.
1369 prepare_to_proceed checks the current thread against the
1370 thread that reported the most recent event. If a step-over
1371 is required it returns TRUE and sets the current thread to
1373 if (prepare_to_proceed (step
))
1377 /* prepare_to_proceed may change the current thread. */
1378 tp
= inferior_thread ();
1382 tp
->trap_expected
= 1;
1383 /* If displaced stepping is enabled, we can step over the
1384 breakpoint without hitting it, so leave all breakpoints
1385 inserted. Otherwise we need to disable all breakpoints, step
1386 one instruction, and then re-add them when that step is
1388 if (!use_displaced_stepping (gdbarch
))
1389 remove_breakpoints ();
1392 /* We can insert breakpoints if we're not trying to step over one,
1393 or if we are stepping over one but we're using displaced stepping
1395 if (! tp
->trap_expected
|| use_displaced_stepping (gdbarch
))
1396 insert_breakpoints ();
1400 /* Pass the last stop signal to the thread we're resuming,
1401 irrespective of whether the current thread is the thread that
1402 got the last event or not. This was historically GDB's
1403 behaviour before keeping a stop_signal per thread. */
1405 struct thread_info
*last_thread
;
1407 struct target_waitstatus last_status
;
1409 get_last_target_status (&last_ptid
, &last_status
);
1410 if (!ptid_equal (inferior_ptid
, last_ptid
)
1411 && !ptid_equal (last_ptid
, null_ptid
)
1412 && !ptid_equal (last_ptid
, minus_one_ptid
))
1414 last_thread
= find_thread_pid (last_ptid
);
1417 tp
->stop_signal
= last_thread
->stop_signal
;
1418 last_thread
->stop_signal
= TARGET_SIGNAL_0
;
1423 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1424 tp
->stop_signal
= siggnal
;
1425 /* If this signal should not be seen by program,
1426 give it zero. Used for debugging signals. */
1427 else if (!signal_program
[tp
->stop_signal
])
1428 tp
->stop_signal
= TARGET_SIGNAL_0
;
1430 annotate_starting ();
1432 /* Make sure that output from GDB appears before output from the
1434 gdb_flush (gdb_stdout
);
1436 /* Refresh prev_pc value just prior to resuming. This used to be
1437 done in stop_stepping, however, setting prev_pc there did not handle
1438 scenarios such as inferior function calls or returning from
1439 a function via the return command. In those cases, the prev_pc
1440 value was not set properly for subsequent commands. The prev_pc value
1441 is used to initialize the starting line number in the ecs. With an
1442 invalid value, the gdb next command ends up stopping at the position
1443 represented by the next line table entry past our start position.
1444 On platforms that generate one line table entry per line, this
1445 is not a problem. However, on the ia64, the compiler generates
1446 extraneous line table entries that do not increase the line number.
1447 When we issue the gdb next command on the ia64 after an inferior call
1448 or a return command, we often end up a few instructions forward, still
1449 within the original line we started.
1451 An attempt was made to have init_execution_control_state () refresh
1452 the prev_pc value before calculating the line number. This approach
1453 did not work because on platforms that use ptrace, the pc register
1454 cannot be read unless the inferior is stopped. At that point, we
1455 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1456 call can fail. Setting the prev_pc value here ensures the value is
1457 updated correctly when the inferior is stopped. */
1458 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
1460 /* Fill in with reasonable starting values. */
1461 init_thread_stepping_state (tp
);
1463 /* Reset to normal state. */
1464 init_infwait_state ();
1466 /* Resume inferior. */
1467 resume (oneproc
|| step
|| bpstat_should_step (), tp
->stop_signal
);
1469 /* Wait for it to stop (if not standalone)
1470 and in any case decode why it stopped, and act accordingly. */
1471 /* Do this only if we are not using the event loop, or if the target
1472 does not support asynchronous execution. */
1473 if (!target_can_async_p ())
1475 wait_for_inferior (0);
1481 /* Start remote-debugging of a machine over a serial link. */
1484 start_remote (int from_tty
)
1486 struct inferior
*inferior
;
1487 init_wait_for_inferior ();
1489 inferior
= current_inferior ();
1490 inferior
->stop_soon
= STOP_QUIETLY_REMOTE
;
1492 /* Always go on waiting for the target, regardless of the mode. */
1493 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1494 indicate to wait_for_inferior that a target should timeout if
1495 nothing is returned (instead of just blocking). Because of this,
1496 targets expecting an immediate response need to, internally, set
1497 things up so that the target_wait() is forced to eventually
1499 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1500 differentiate to its caller what the state of the target is after
1501 the initial open has been performed. Here we're assuming that
1502 the target has stopped. It should be possible to eventually have
1503 target_open() return to the caller an indication that the target
1504 is currently running and GDB state should be set to the same as
1505 for an async run. */
1506 wait_for_inferior (0);
1508 /* Now that the inferior has stopped, do any bookkeeping like
1509 loading shared libraries. We want to do this before normal_stop,
1510 so that the displayed frame is up to date. */
1511 post_create_inferior (¤t_target
, from_tty
);
1516 /* Initialize static vars when a new inferior begins. */
1519 init_wait_for_inferior (void)
1521 /* These are meaningless until the first time through wait_for_inferior. */
1523 breakpoint_init_inferior (inf_starting
);
1525 /* The first resume is not following a fork/vfork/exec. */
1526 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1528 clear_proceed_status ();
1530 stepping_past_singlestep_breakpoint
= 0;
1531 deferred_step_ptid
= null_ptid
;
1533 target_last_wait_ptid
= minus_one_ptid
;
1535 previous_inferior_ptid
= null_ptid
;
1536 init_infwait_state ();
1538 displaced_step_clear ();
1542 /* This enum encodes possible reasons for doing a target_wait, so that
1543 wfi can call target_wait in one place. (Ultimately the call will be
1544 moved out of the infinite loop entirely.) */
1548 infwait_normal_state
,
1549 infwait_thread_hop_state
,
1550 infwait_step_watch_state
,
1551 infwait_nonstep_watch_state
1554 /* Why did the inferior stop? Used to print the appropriate messages
1555 to the interface from within handle_inferior_event(). */
1556 enum inferior_stop_reason
1558 /* Step, next, nexti, stepi finished. */
1560 /* Inferior terminated by signal. */
1562 /* Inferior exited. */
1564 /* Inferior received signal, and user asked to be notified. */
1566 /* Reverse execution -- target ran out of history info. */
1570 /* The PTID we'll do a target_wait on.*/
1573 /* Current inferior wait state. */
1574 enum infwait_states infwait_state
;
1576 /* Data to be passed around while handling an event. This data is
1577 discarded between events. */
1578 struct execution_control_state
1581 /* The thread that got the event, if this was a thread event; NULL
1583 struct thread_info
*event_thread
;
1585 struct target_waitstatus ws
;
1587 CORE_ADDR stop_func_start
;
1588 CORE_ADDR stop_func_end
;
1589 char *stop_func_name
;
1590 int new_thread_event
;
1594 void init_execution_control_state (struct execution_control_state
*ecs
);
1596 void handle_inferior_event (struct execution_control_state
*ecs
);
1598 static void handle_step_into_function (struct execution_control_state
*ecs
);
1599 static void handle_step_into_function_backward (struct execution_control_state
*ecs
);
1600 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1601 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1602 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1603 struct frame_id sr_id
);
1604 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1606 static void stop_stepping (struct execution_control_state
*ecs
);
1607 static void prepare_to_wait (struct execution_control_state
*ecs
);
1608 static void keep_going (struct execution_control_state
*ecs
);
1609 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1612 /* Callback for iterate over threads. If the thread is stopped, but
1613 the user/frontend doesn't know about that yet, go through
1614 normal_stop, as if the thread had just stopped now. ARG points at
1615 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
1616 ptid_is_pid(PTID) is true, applies to all threads of the process
1617 pointed at by PTID. Otherwise, apply only to the thread pointed by
1621 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
1623 ptid_t ptid
= * (ptid_t
*) arg
;
1625 if ((ptid_equal (info
->ptid
, ptid
)
1626 || ptid_equal (minus_one_ptid
, ptid
)
1627 || (ptid_is_pid (ptid
)
1628 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
1629 && is_running (info
->ptid
)
1630 && !is_executing (info
->ptid
))
1632 struct cleanup
*old_chain
;
1633 struct execution_control_state ecss
;
1634 struct execution_control_state
*ecs
= &ecss
;
1636 memset (ecs
, 0, sizeof (*ecs
));
1638 old_chain
= make_cleanup_restore_current_thread ();
1640 switch_to_thread (info
->ptid
);
1642 /* Go through handle_inferior_event/normal_stop, so we always
1643 have consistent output as if the stop event had been
1645 ecs
->ptid
= info
->ptid
;
1646 ecs
->event_thread
= find_thread_pid (info
->ptid
);
1647 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1648 ecs
->ws
.value
.sig
= TARGET_SIGNAL_0
;
1650 handle_inferior_event (ecs
);
1652 if (!ecs
->wait_some_more
)
1654 struct thread_info
*tp
;
1658 /* Finish off the continuations. The continations
1659 themselves are responsible for realising the thread
1660 didn't finish what it was supposed to do. */
1661 tp
= inferior_thread ();
1662 do_all_intermediate_continuations_thread (tp
);
1663 do_all_continuations_thread (tp
);
1666 do_cleanups (old_chain
);
1672 /* This function is attached as a "thread_stop_requested" observer.
1673 Cleanup local state that assumed the PTID was to be resumed, and
1674 report the stop to the frontend. */
1677 infrun_thread_stop_requested (ptid_t ptid
)
1679 struct displaced_step_request
*it
, *next
, *prev
= NULL
;
1681 /* PTID was requested to stop. Remove it from the displaced
1682 stepping queue, so we don't try to resume it automatically. */
1683 for (it
= displaced_step_request_queue
; it
; it
= next
)
1687 if (ptid_equal (it
->ptid
, ptid
)
1688 || ptid_equal (minus_one_ptid
, ptid
)
1689 || (ptid_is_pid (ptid
)
1690 && ptid_get_pid (ptid
) == ptid_get_pid (it
->ptid
)))
1692 if (displaced_step_request_queue
== it
)
1693 displaced_step_request_queue
= it
->next
;
1695 prev
->next
= it
->next
;
1703 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
1706 void nullify_last_target_wait_ptid (void);
1709 infrun_thread_thread_exit (struct thread_info
*tp
, int silent
)
1711 if (ptid_equal (target_last_wait_ptid
, tp
->ptid
))
1712 nullify_last_target_wait_ptid ();
1715 /* Callback for iterate_over_threads. */
1718 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
1720 if (is_exited (info
->ptid
))
1723 delete_step_resume_breakpoint (info
);
1727 /* In all-stop, delete the step resume breakpoint of any thread that
1728 had one. In non-stop, delete the step resume breakpoint of the
1729 thread that just stopped. */
1732 delete_step_thread_step_resume_breakpoint (void)
1734 if (!target_has_execution
1735 || ptid_equal (inferior_ptid
, null_ptid
))
1736 /* If the inferior has exited, we have already deleted the step
1737 resume breakpoints out of GDB's lists. */
1742 /* If in non-stop mode, only delete the step-resume or
1743 longjmp-resume breakpoint of the thread that just stopped
1745 struct thread_info
*tp
= inferior_thread ();
1746 delete_step_resume_breakpoint (tp
);
1749 /* In all-stop mode, delete all step-resume and longjmp-resume
1750 breakpoints of any thread that had them. */
1751 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
1754 /* A cleanup wrapper. */
1757 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
1759 delete_step_thread_step_resume_breakpoint ();
1762 /* Pretty print the results of target_wait, for debugging purposes. */
1765 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
1766 const struct target_waitstatus
*ws
)
1768 char *status_string
= target_waitstatus_to_string (ws
);
1769 struct ui_file
*tmp_stream
= mem_fileopen ();
1773 /* The text is split over several lines because it was getting too long.
1774 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
1775 output as a unit; we want only one timestamp printed if debug_timestamp
1778 fprintf_unfiltered (tmp_stream
,
1779 "infrun: target_wait (%d", PIDGET (waiton_ptid
));
1780 if (PIDGET (waiton_ptid
) != -1)
1781 fprintf_unfiltered (tmp_stream
,
1782 " [%s]", target_pid_to_str (waiton_ptid
));
1783 fprintf_unfiltered (tmp_stream
, ", status) =\n");
1784 fprintf_unfiltered (tmp_stream
,
1785 "infrun: %d [%s],\n",
1786 PIDGET (result_ptid
), target_pid_to_str (result_ptid
));
1787 fprintf_unfiltered (tmp_stream
,
1791 text
= ui_file_xstrdup (tmp_stream
, &len
);
1793 /* This uses %s in part to handle %'s in the text, but also to avoid
1794 a gcc error: the format attribute requires a string literal. */
1795 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
1797 xfree (status_string
);
1799 ui_file_delete (tmp_stream
);
1802 /* Wait for control to return from inferior to debugger.
1804 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1805 as if they were SIGTRAP signals. This can be useful during
1806 the startup sequence on some targets such as HP/UX, where
1807 we receive an EXEC event instead of the expected SIGTRAP.
1809 If inferior gets a signal, we may decide to start it up again
1810 instead of returning. That is why there is a loop in this function.
1811 When this function actually returns it means the inferior
1812 should be left stopped and GDB should read more commands. */
1815 wait_for_inferior (int treat_exec_as_sigtrap
)
1817 struct cleanup
*old_cleanups
;
1818 struct execution_control_state ecss
;
1819 struct execution_control_state
*ecs
;
1823 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1824 treat_exec_as_sigtrap
);
1827 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
1830 memset (ecs
, 0, sizeof (*ecs
));
1832 overlay_cache_invalid
= 1;
1834 /* We'll update this if & when we switch to a new thread. */
1835 previous_inferior_ptid
= inferior_ptid
;
1837 /* We have to invalidate the registers BEFORE calling target_wait
1838 because they can be loaded from the target while in target_wait.
1839 This makes remote debugging a bit more efficient for those
1840 targets that provide critical registers as part of their normal
1841 status mechanism. */
1843 registers_changed ();
1847 struct cleanup
*old_chain
;
1849 if (deprecated_target_wait_hook
)
1850 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1852 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1855 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
1857 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
1859 xfree (ecs
->ws
.value
.execd_pathname
);
1860 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1861 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
1864 /* If an error happens while handling the event, propagate GDB's
1865 knowledge of the executing state to the frontend/user running
1867 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
1869 /* Now figure out what to do with the result of the result. */
1870 handle_inferior_event (ecs
);
1872 /* No error, don't finish the state yet. */
1873 discard_cleanups (old_chain
);
1875 if (!ecs
->wait_some_more
)
1879 do_cleanups (old_cleanups
);
1882 /* Asynchronous version of wait_for_inferior. It is called by the
1883 event loop whenever a change of state is detected on the file
1884 descriptor corresponding to the target. It can be called more than
1885 once to complete a single execution command. In such cases we need
1886 to keep the state in a global variable ECSS. If it is the last time
1887 that this function is called for a single execution command, then
1888 report to the user that the inferior has stopped, and do the
1889 necessary cleanups. */
1892 fetch_inferior_event (void *client_data
)
1894 struct execution_control_state ecss
;
1895 struct execution_control_state
*ecs
= &ecss
;
1896 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
1897 struct cleanup
*ts_old_chain
;
1898 int was_sync
= sync_execution
;
1900 memset (ecs
, 0, sizeof (*ecs
));
1902 overlay_cache_invalid
= 1;
1904 /* We can only rely on wait_for_more being correct before handling
1905 the event in all-stop, but previous_inferior_ptid isn't used in
1907 if (!ecs
->wait_some_more
)
1908 /* We'll update this if & when we switch to a new thread. */
1909 previous_inferior_ptid
= inferior_ptid
;
1912 /* In non-stop mode, the user/frontend should not notice a thread
1913 switch due to internal events. Make sure we reverse to the
1914 user selected thread and frame after handling the event and
1915 running any breakpoint commands. */
1916 make_cleanup_restore_current_thread ();
1918 /* We have to invalidate the registers BEFORE calling target_wait
1919 because they can be loaded from the target while in target_wait.
1920 This makes remote debugging a bit more efficient for those
1921 targets that provide critical registers as part of their normal
1922 status mechanism. */
1924 registers_changed ();
1926 if (deprecated_target_wait_hook
)
1928 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1930 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1933 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
1936 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
1937 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1938 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
1939 /* In non-stop mode, each thread is handled individually. Switch
1940 early, so the global state is set correctly for this
1942 context_switch (ecs
->ptid
);
1944 /* If an error happens while handling the event, propagate GDB's
1945 knowledge of the executing state to the frontend/user running
1948 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
1950 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
1952 /* Now figure out what to do with the result of the result. */
1953 handle_inferior_event (ecs
);
1955 if (!ecs
->wait_some_more
)
1957 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
1959 delete_step_thread_step_resume_breakpoint ();
1961 /* We may not find an inferior if this was a process exit. */
1962 if (inf
== NULL
|| inf
->stop_soon
== NO_STOP_QUIETLY
)
1965 if (target_has_execution
1966 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1967 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1968 && ecs
->event_thread
->step_multi
1969 && ecs
->event_thread
->stop_step
)
1970 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1972 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1975 /* No error, don't finish the thread states yet. */
1976 discard_cleanups (ts_old_chain
);
1978 /* Revert thread and frame. */
1979 do_cleanups (old_chain
);
1981 /* If the inferior was in sync execution mode, and now isn't,
1982 restore the prompt. */
1983 if (was_sync
&& !sync_execution
)
1984 display_gdb_prompt (0);
1987 /* Prepare an execution control state for looping through a
1988 wait_for_inferior-type loop. */
1991 init_execution_control_state (struct execution_control_state
*ecs
)
1993 ecs
->random_signal
= 0;
1996 /* Clear context switchable stepping state. */
1999 init_thread_stepping_state (struct thread_info
*tss
)
2001 struct symtab_and_line sal
;
2003 tss
->stepping_over_breakpoint
= 0;
2004 tss
->step_after_step_resume_breakpoint
= 0;
2005 tss
->stepping_through_solib_after_catch
= 0;
2006 tss
->stepping_through_solib_catchpoints
= NULL
;
2008 sal
= find_pc_line (tss
->prev_pc
, 0);
2009 tss
->current_line
= sal
.line
;
2010 tss
->current_symtab
= sal
.symtab
;
2013 /* Return the cached copy of the last pid/waitstatus returned by
2014 target_wait()/deprecated_target_wait_hook(). The data is actually
2015 cached by handle_inferior_event(), which gets called immediately
2016 after target_wait()/deprecated_target_wait_hook(). */
2019 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
2021 *ptidp
= target_last_wait_ptid
;
2022 *status
= target_last_waitstatus
;
2026 nullify_last_target_wait_ptid (void)
2028 target_last_wait_ptid
= minus_one_ptid
;
2031 /* Switch thread contexts. */
2034 context_switch (ptid_t ptid
)
2038 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
2039 target_pid_to_str (inferior_ptid
));
2040 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
2041 target_pid_to_str (ptid
));
2044 switch_to_thread (ptid
);
2048 adjust_pc_after_break (struct execution_control_state
*ecs
)
2050 struct regcache
*regcache
;
2051 struct gdbarch
*gdbarch
;
2052 CORE_ADDR breakpoint_pc
;
2054 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
2055 we aren't, just return.
2057 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
2058 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
2059 implemented by software breakpoints should be handled through the normal
2062 NOTE drow/2004-01-31: On some targets, breakpoints may generate
2063 different signals (SIGILL or SIGEMT for instance), but it is less
2064 clear where the PC is pointing afterwards. It may not match
2065 gdbarch_decr_pc_after_break. I don't know any specific target that
2066 generates these signals at breakpoints (the code has been in GDB since at
2067 least 1992) so I can not guess how to handle them here.
2069 In earlier versions of GDB, a target with
2070 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2071 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2072 target with both of these set in GDB history, and it seems unlikely to be
2073 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2075 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2078 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
2081 /* In reverse execution, when a breakpoint is hit, the instruction
2082 under it has already been de-executed. The reported PC always
2083 points at the breakpoint address, so adjusting it further would
2084 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2087 B1 0x08000000 : INSN1
2088 B2 0x08000001 : INSN2
2090 PC -> 0x08000003 : INSN4
2092 Say you're stopped at 0x08000003 as above. Reverse continuing
2093 from that point should hit B2 as below. Reading the PC when the
2094 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2095 been de-executed already.
2097 B1 0x08000000 : INSN1
2098 B2 PC -> 0x08000001 : INSN2
2102 We can't apply the same logic as for forward execution, because
2103 we would wrongly adjust the PC to 0x08000000, since there's a
2104 breakpoint at PC - 1. We'd then report a hit on B1, although
2105 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2107 if (execution_direction
== EXEC_REVERSE
)
2110 /* If this target does not decrement the PC after breakpoints, then
2111 we have nothing to do. */
2112 regcache
= get_thread_regcache (ecs
->ptid
);
2113 gdbarch
= get_regcache_arch (regcache
);
2114 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
2117 /* Find the location where (if we've hit a breakpoint) the
2118 breakpoint would be. */
2119 breakpoint_pc
= regcache_read_pc (regcache
)
2120 - gdbarch_decr_pc_after_break (gdbarch
);
2122 /* Check whether there actually is a software breakpoint inserted at
2125 If in non-stop mode, a race condition is possible where we've
2126 removed a breakpoint, but stop events for that breakpoint were
2127 already queued and arrive later. To suppress those spurious
2128 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
2129 and retire them after a number of stop events are reported. */
2130 if (software_breakpoint_inserted_here_p (breakpoint_pc
)
2131 || (non_stop
&& moribund_breakpoint_here_p (breakpoint_pc
)))
2133 /* When using hardware single-step, a SIGTRAP is reported for both
2134 a completed single-step and a software breakpoint. Need to
2135 differentiate between the two, as the latter needs adjusting
2136 but the former does not.
2138 The SIGTRAP can be due to a completed hardware single-step only if
2139 - we didn't insert software single-step breakpoints
2140 - the thread to be examined is still the current thread
2141 - this thread is currently being stepped
2143 If any of these events did not occur, we must have stopped due
2144 to hitting a software breakpoint, and have to back up to the
2147 As a special case, we could have hardware single-stepped a
2148 software breakpoint. In this case (prev_pc == breakpoint_pc),
2149 we also need to back up to the breakpoint address. */
2151 if (singlestep_breakpoints_inserted_p
2152 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
2153 || !currently_stepping (ecs
->event_thread
)
2154 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
2155 regcache_write_pc (regcache
, breakpoint_pc
);
2160 init_infwait_state (void)
2162 waiton_ptid
= pid_to_ptid (-1);
2163 infwait_state
= infwait_normal_state
;
2167 error_is_running (void)
2170 Cannot execute this command while the selected thread is running."));
2174 ensure_not_running (void)
2176 if (is_running (inferior_ptid
))
2177 error_is_running ();
2180 /* Given an execution control state that has been freshly filled in
2181 by an event from the inferior, figure out what it means and take
2182 appropriate action. */
2185 handle_inferior_event (struct execution_control_state
*ecs
)
2187 int sw_single_step_trap_p
= 0;
2188 int stopped_by_watchpoint
;
2189 int stepped_after_stopped_by_watchpoint
= 0;
2190 struct symtab_and_line stop_pc_sal
;
2191 enum stop_kind stop_soon
;
2193 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2194 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2195 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2197 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2199 stop_soon
= inf
->stop_soon
;
2202 stop_soon
= NO_STOP_QUIETLY
;
2204 /* Cache the last pid/waitstatus. */
2205 target_last_wait_ptid
= ecs
->ptid
;
2206 target_last_waitstatus
= ecs
->ws
;
2208 /* Always clear state belonging to the previous time we stopped. */
2209 stop_stack_dummy
= 0;
2211 /* If it's a new process, add it to the thread database */
2213 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
2214 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
2215 && !in_thread_list (ecs
->ptid
));
2217 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2218 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
2219 add_thread (ecs
->ptid
);
2221 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2223 /* Dependent on valid ECS->EVENT_THREAD. */
2224 adjust_pc_after_break (ecs
);
2226 /* Dependent on the current PC value modified by adjust_pc_after_break. */
2227 reinit_frame_cache ();
2229 if (ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2231 breakpoint_retire_moribund ();
2233 /* Mark the non-executing threads accordingly. In all-stop, all
2234 threads of all processes are stopped when we get any event
2235 reported. In non-stop mode, only the event thread stops. If
2236 we're handling a process exit in non-stop mode, there's
2237 nothing to do, as threads of the dead process are gone, and
2238 threads of any other process were left running. */
2240 set_executing (minus_one_ptid
, 0);
2241 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2242 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
2243 set_executing (inferior_ptid
, 0);
2246 switch (infwait_state
)
2248 case infwait_thread_hop_state
:
2250 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
2251 /* Cancel the waiton_ptid. */
2252 waiton_ptid
= pid_to_ptid (-1);
2255 case infwait_normal_state
:
2257 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
2260 case infwait_step_watch_state
:
2262 fprintf_unfiltered (gdb_stdlog
,
2263 "infrun: infwait_step_watch_state\n");
2265 stepped_after_stopped_by_watchpoint
= 1;
2268 case infwait_nonstep_watch_state
:
2270 fprintf_unfiltered (gdb_stdlog
,
2271 "infrun: infwait_nonstep_watch_state\n");
2272 insert_breakpoints ();
2274 /* FIXME-maybe: is this cleaner than setting a flag? Does it
2275 handle things like signals arriving and other things happening
2276 in combination correctly? */
2277 stepped_after_stopped_by_watchpoint
= 1;
2281 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2283 infwait_state
= infwait_normal_state
;
2285 switch (ecs
->ws
.kind
)
2287 case TARGET_WAITKIND_LOADED
:
2289 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
2290 /* Ignore gracefully during startup of the inferior, as it might
2291 be the shell which has just loaded some objects, otherwise
2292 add the symbols for the newly loaded objects. Also ignore at
2293 the beginning of an attach or remote session; we will query
2294 the full list of libraries once the connection is
2296 if (stop_soon
== NO_STOP_QUIETLY
)
2298 /* Check for any newly added shared libraries if we're
2299 supposed to be adding them automatically. Switch
2300 terminal for any messages produced by
2301 breakpoint_re_set. */
2302 target_terminal_ours_for_output ();
2303 /* NOTE: cagney/2003-11-25: Make certain that the target
2304 stack's section table is kept up-to-date. Architectures,
2305 (e.g., PPC64), use the section table to perform
2306 operations such as address => section name and hence
2307 require the table to contain all sections (including
2308 those found in shared libraries). */
2309 /* NOTE: cagney/2003-11-25: Pass current_target and not
2310 exec_ops to SOLIB_ADD. This is because current GDB is
2311 only tooled to propagate section_table changes out from
2312 the "current_target" (see target_resize_to_sections), and
2313 not up from the exec stratum. This, of course, isn't
2314 right. "infrun.c" should only interact with the
2315 exec/process stratum, instead relying on the target stack
2316 to propagate relevant changes (stop, section table
2317 changed, ...) up to other layers. */
2319 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2321 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2323 target_terminal_inferior ();
2325 /* If requested, stop when the dynamic linker notifies
2326 gdb of events. This allows the user to get control
2327 and place breakpoints in initializer routines for
2328 dynamically loaded objects (among other things). */
2329 if (stop_on_solib_events
)
2331 stop_stepping (ecs
);
2335 /* NOTE drow/2007-05-11: This might be a good place to check
2336 for "catch load". */
2339 /* If we are skipping through a shell, or through shared library
2340 loading that we aren't interested in, resume the program. If
2341 we're running the program normally, also resume. But stop if
2342 we're attaching or setting up a remote connection. */
2343 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
2345 /* Loading of shared libraries might have changed breakpoint
2346 addresses. Make sure new breakpoints are inserted. */
2347 if (stop_soon
== NO_STOP_QUIETLY
2348 && !breakpoints_always_inserted_mode ())
2349 insert_breakpoints ();
2350 resume (0, TARGET_SIGNAL_0
);
2351 prepare_to_wait (ecs
);
2357 case TARGET_WAITKIND_SPURIOUS
:
2359 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
2360 resume (0, TARGET_SIGNAL_0
);
2361 prepare_to_wait (ecs
);
2364 case TARGET_WAITKIND_EXITED
:
2366 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
2367 inferior_ptid
= ecs
->ptid
;
2368 target_terminal_ours (); /* Must do this before mourn anyway */
2369 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
2371 /* Record the exit code in the convenience variable $_exitcode, so
2372 that the user can inspect this again later. */
2373 set_internalvar (lookup_internalvar ("_exitcode"),
2374 value_from_longest (builtin_type_int32
,
2375 (LONGEST
) ecs
->ws
.value
.integer
));
2376 gdb_flush (gdb_stdout
);
2377 target_mourn_inferior ();
2378 singlestep_breakpoints_inserted_p
= 0;
2379 stop_print_frame
= 0;
2380 stop_stepping (ecs
);
2383 case TARGET_WAITKIND_SIGNALLED
:
2385 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
2386 inferior_ptid
= ecs
->ptid
;
2387 stop_print_frame
= 0;
2388 target_terminal_ours (); /* Must do this before mourn anyway */
2390 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
2391 reach here unless the inferior is dead. However, for years
2392 target_kill() was called here, which hints that fatal signals aren't
2393 really fatal on some systems. If that's true, then some changes
2395 target_mourn_inferior ();
2397 print_stop_reason (SIGNAL_EXITED
, ecs
->ws
.value
.sig
);
2398 singlestep_breakpoints_inserted_p
= 0;
2399 stop_stepping (ecs
);
2402 /* The following are the only cases in which we keep going;
2403 the above cases end in a continue or goto. */
2404 case TARGET_WAITKIND_FORKED
:
2405 case TARGET_WAITKIND_VFORKED
:
2407 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
2408 pending_follow
.kind
= ecs
->ws
.kind
;
2410 pending_follow
.fork_event
.parent_pid
= ecs
->ptid
;
2411 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
2413 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2415 context_switch (ecs
->ptid
);
2416 reinit_frame_cache ();
2419 stop_pc
= read_pc ();
2421 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2423 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2425 /* If no catchpoint triggered for this, then keep going. */
2426 if (ecs
->random_signal
)
2428 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2432 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2433 goto process_event_stop_test
;
2435 case TARGET_WAITKIND_EXECD
:
2437 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
2438 pending_follow
.execd_pathname
=
2439 savestring (ecs
->ws
.value
.execd_pathname
,
2440 strlen (ecs
->ws
.value
.execd_pathname
));
2442 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2444 context_switch (ecs
->ptid
);
2445 reinit_frame_cache ();
2448 stop_pc
= read_pc ();
2450 /* This causes the eventpoints and symbol table to be reset.
2451 Must do this now, before trying to determine whether to
2453 follow_exec (inferior_ptid
, pending_follow
.execd_pathname
);
2454 xfree (pending_follow
.execd_pathname
);
2456 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2457 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2459 /* If no catchpoint triggered for this, then keep going. */
2460 if (ecs
->random_signal
)
2462 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2466 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2467 goto process_event_stop_test
;
2469 /* Be careful not to try to gather much state about a thread
2470 that's in a syscall. It's frequently a losing proposition. */
2471 case TARGET_WAITKIND_SYSCALL_ENTRY
:
2473 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
2474 resume (0, TARGET_SIGNAL_0
);
2475 prepare_to_wait (ecs
);
2478 /* Before examining the threads further, step this thread to
2479 get it entirely out of the syscall. (We get notice of the
2480 event when the thread is just on the verge of exiting a
2481 syscall. Stepping one instruction seems to get it back
2483 case TARGET_WAITKIND_SYSCALL_RETURN
:
2485 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
2486 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
2487 prepare_to_wait (ecs
);
2490 case TARGET_WAITKIND_STOPPED
:
2492 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
2493 ecs
->event_thread
->stop_signal
= ecs
->ws
.value
.sig
;
2496 case TARGET_WAITKIND_NO_HISTORY
:
2497 /* Reverse execution: target ran out of history info. */
2498 stop_pc
= read_pc ();
2499 print_stop_reason (NO_HISTORY
, 0);
2500 stop_stepping (ecs
);
2503 /* We had an event in the inferior, but we are not interested
2504 in handling it at this level. The lower layers have already
2505 done what needs to be done, if anything.
2507 One of the possible circumstances for this is when the
2508 inferior produces output for the console. The inferior has
2509 not stopped, and we are ignoring the event. Another possible
2510 circumstance is any event which the lower level knows will be
2511 reported multiple times without an intervening resume. */
2512 case TARGET_WAITKIND_IGNORE
:
2514 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
2515 prepare_to_wait (ecs
);
2519 if (ecs
->new_thread_event
)
2522 /* Non-stop assumes that the target handles adding new threads
2523 to the thread list. */
2524 internal_error (__FILE__
, __LINE__
, "\
2525 targets should add new threads to the thread list themselves in non-stop mode.");
2527 /* We may want to consider not doing a resume here in order to
2528 give the user a chance to play with the new thread. It might
2529 be good to make that a user-settable option. */
2531 /* At this point, all threads are stopped (happens automatically
2532 in either the OS or the native code). Therefore we need to
2533 continue all threads in order to make progress. */
2535 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2536 prepare_to_wait (ecs
);
2540 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
2542 /* Do we need to clean up the state of a thread that has
2543 completed a displaced single-step? (Doing so usually affects
2544 the PC, so do it here, before we set stop_pc.) */
2545 displaced_step_fixup (ecs
->ptid
, ecs
->event_thread
->stop_signal
);
2547 /* If we either finished a single-step or hit a breakpoint, but
2548 the user wanted this thread to be stopped, pretend we got a
2549 SIG0 (generic unsignaled stop). */
2551 if (ecs
->event_thread
->stop_requested
2552 && ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2553 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2556 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2560 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2561 paddr_nz (stop_pc
));
2562 if (STOPPED_BY_WATCHPOINT (&ecs
->ws
))
2565 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2567 if (target_stopped_data_address (¤t_target
, &addr
))
2568 fprintf_unfiltered (gdb_stdlog
,
2569 "infrun: stopped data address = 0x%s\n",
2572 fprintf_unfiltered (gdb_stdlog
,
2573 "infrun: (no data address available)\n");
2577 if (stepping_past_singlestep_breakpoint
)
2579 gdb_assert (singlestep_breakpoints_inserted_p
);
2580 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2581 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2583 stepping_past_singlestep_breakpoint
= 0;
2585 /* We've either finished single-stepping past the single-step
2586 breakpoint, or stopped for some other reason. It would be nice if
2587 we could tell, but we can't reliably. */
2588 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2591 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2592 /* Pull the single step breakpoints out of the target. */
2593 remove_single_step_breakpoints ();
2594 singlestep_breakpoints_inserted_p
= 0;
2596 ecs
->random_signal
= 0;
2598 context_switch (saved_singlestep_ptid
);
2599 if (deprecated_context_hook
)
2600 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2602 resume (1, TARGET_SIGNAL_0
);
2603 prepare_to_wait (ecs
);
2608 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2610 /* In non-stop mode, there's never a deferred_step_ptid set. */
2611 gdb_assert (!non_stop
);
2613 /* If we stopped for some other reason than single-stepping, ignore
2614 the fact that we were supposed to switch back. */
2615 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2618 fprintf_unfiltered (gdb_stdlog
,
2619 "infrun: handling deferred step\n");
2621 /* Pull the single step breakpoints out of the target. */
2622 if (singlestep_breakpoints_inserted_p
)
2624 remove_single_step_breakpoints ();
2625 singlestep_breakpoints_inserted_p
= 0;
2628 /* Note: We do not call context_switch at this point, as the
2629 context is already set up for stepping the original thread. */
2630 switch_to_thread (deferred_step_ptid
);
2631 deferred_step_ptid
= null_ptid
;
2632 /* Suppress spurious "Switching to ..." message. */
2633 previous_inferior_ptid
= inferior_ptid
;
2635 resume (1, TARGET_SIGNAL_0
);
2636 prepare_to_wait (ecs
);
2640 deferred_step_ptid
= null_ptid
;
2643 /* See if a thread hit a thread-specific breakpoint that was meant for
2644 another thread. If so, then step that thread past the breakpoint,
2647 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2649 int thread_hop_needed
= 0;
2651 /* Check if a regular breakpoint has been hit before checking
2652 for a potential single step breakpoint. Otherwise, GDB will
2653 not see this breakpoint hit when stepping onto breakpoints. */
2654 if (regular_breakpoint_inserted_here_p (stop_pc
))
2656 ecs
->random_signal
= 0;
2657 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2658 thread_hop_needed
= 1;
2660 else if (singlestep_breakpoints_inserted_p
)
2662 /* We have not context switched yet, so this should be true
2663 no matter which thread hit the singlestep breakpoint. */
2664 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2666 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2668 target_pid_to_str (ecs
->ptid
));
2670 ecs
->random_signal
= 0;
2671 /* The call to in_thread_list is necessary because PTIDs sometimes
2672 change when we go from single-threaded to multi-threaded. If
2673 the singlestep_ptid is still in the list, assume that it is
2674 really different from ecs->ptid. */
2675 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2676 && in_thread_list (singlestep_ptid
))
2678 /* If the PC of the thread we were trying to single-step
2679 has changed, discard this event (which we were going
2680 to ignore anyway), and pretend we saw that thread
2681 trap. This prevents us continuously moving the
2682 single-step breakpoint forward, one instruction at a
2683 time. If the PC has changed, then the thread we were
2684 trying to single-step has trapped or been signalled,
2685 but the event has not been reported to GDB yet.
2687 There might be some cases where this loses signal
2688 information, if a signal has arrived at exactly the
2689 same time that the PC changed, but this is the best
2690 we can do with the information available. Perhaps we
2691 should arrange to report all events for all threads
2692 when they stop, or to re-poll the remote looking for
2693 this particular thread (i.e. temporarily enable
2696 CORE_ADDR new_singlestep_pc
2697 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2699 if (new_singlestep_pc
!= singlestep_pc
)
2701 enum target_signal stop_signal
;
2704 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2705 " but expected thread advanced also\n");
2707 /* The current context still belongs to
2708 singlestep_ptid. Don't swap here, since that's
2709 the context we want to use. Just fudge our
2710 state and continue. */
2711 stop_signal
= ecs
->event_thread
->stop_signal
;
2712 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2713 ecs
->ptid
= singlestep_ptid
;
2714 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2715 ecs
->event_thread
->stop_signal
= stop_signal
;
2716 stop_pc
= new_singlestep_pc
;
2721 fprintf_unfiltered (gdb_stdlog
,
2722 "infrun: unexpected thread\n");
2724 thread_hop_needed
= 1;
2725 stepping_past_singlestep_breakpoint
= 1;
2726 saved_singlestep_ptid
= singlestep_ptid
;
2731 if (thread_hop_needed
)
2733 int remove_status
= 0;
2736 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2738 /* Saw a breakpoint, but it was hit by the wrong thread.
2741 if (singlestep_breakpoints_inserted_p
)
2743 /* Pull the single step breakpoints out of the target. */
2744 remove_single_step_breakpoints ();
2745 singlestep_breakpoints_inserted_p
= 0;
2748 /* If the arch can displace step, don't remove the
2750 if (!use_displaced_stepping (current_gdbarch
))
2751 remove_status
= remove_breakpoints ();
2753 /* Did we fail to remove breakpoints? If so, try
2754 to set the PC past the bp. (There's at least
2755 one situation in which we can fail to remove
2756 the bp's: On HP-UX's that use ttrace, we can't
2757 change the address space of a vforking child
2758 process until the child exits (well, okay, not
2759 then either :-) or execs. */
2760 if (remove_status
!= 0)
2761 error (_("Cannot step over breakpoint hit in wrong thread"));
2764 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2765 context_switch (ecs
->ptid
);
2769 /* Only need to require the next event from this
2770 thread in all-stop mode. */
2771 waiton_ptid
= ecs
->ptid
;
2772 infwait_state
= infwait_thread_hop_state
;
2775 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2777 registers_changed ();
2781 else if (singlestep_breakpoints_inserted_p
)
2783 sw_single_step_trap_p
= 1;
2784 ecs
->random_signal
= 0;
2788 ecs
->random_signal
= 1;
2790 /* See if something interesting happened to the non-current thread. If
2791 so, then switch to that thread. */
2792 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2795 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2797 context_switch (ecs
->ptid
);
2799 if (deprecated_context_hook
)
2800 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2803 if (singlestep_breakpoints_inserted_p
)
2805 /* Pull the single step breakpoints out of the target. */
2806 remove_single_step_breakpoints ();
2807 singlestep_breakpoints_inserted_p
= 0;
2810 if (stepped_after_stopped_by_watchpoint
)
2811 stopped_by_watchpoint
= 0;
2813 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
2815 /* If necessary, step over this watchpoint. We'll be back to display
2817 if (stopped_by_watchpoint
2818 && (HAVE_STEPPABLE_WATCHPOINT
2819 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
2821 /* At this point, we are stopped at an instruction which has
2822 attempted to write to a piece of memory under control of
2823 a watchpoint. The instruction hasn't actually executed
2824 yet. If we were to evaluate the watchpoint expression
2825 now, we would get the old value, and therefore no change
2826 would seem to have occurred.
2828 In order to make watchpoints work `right', we really need
2829 to complete the memory write, and then evaluate the
2830 watchpoint expression. We do this by single-stepping the
2833 It may not be necessary to disable the watchpoint to stop over
2834 it. For example, the PA can (with some kernel cooperation)
2835 single step over a watchpoint without disabling the watchpoint.
2837 It is far more common to need to disable a watchpoint to step
2838 the inferior over it. If we have non-steppable watchpoints,
2839 we must disable the current watchpoint; it's simplest to
2840 disable all watchpoints and breakpoints. */
2843 if (!HAVE_STEPPABLE_WATCHPOINT
)
2844 remove_breakpoints ();
2845 registers_changed ();
2847 hw_step
= maybe_software_singlestep (current_gdbarch
, read_pc ());
2848 target_resume (ecs
->ptid
, hw_step
, TARGET_SIGNAL_0
);
2849 waiton_ptid
= ecs
->ptid
;
2850 if (HAVE_STEPPABLE_WATCHPOINT
)
2851 infwait_state
= infwait_step_watch_state
;
2853 infwait_state
= infwait_nonstep_watch_state
;
2854 prepare_to_wait (ecs
);
2858 ecs
->stop_func_start
= 0;
2859 ecs
->stop_func_end
= 0;
2860 ecs
->stop_func_name
= 0;
2861 /* Don't care about return value; stop_func_start and stop_func_name
2862 will both be 0 if it doesn't work. */
2863 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2864 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2865 ecs
->stop_func_start
2866 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
2867 ecs
->event_thread
->stepping_over_breakpoint
= 0;
2868 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
2869 ecs
->event_thread
->stop_step
= 0;
2870 stop_print_frame
= 1;
2871 ecs
->random_signal
= 0;
2872 stopped_by_random_signal
= 0;
2874 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2875 && ecs
->event_thread
->trap_expected
2876 && gdbarch_single_step_through_delay_p (current_gdbarch
)
2877 && currently_stepping (ecs
->event_thread
))
2879 /* We're trying to step off a breakpoint. Turns out that we're
2880 also on an instruction that needs to be stepped multiple
2881 times before it's been fully executing. E.g., architectures
2882 with a delay slot. It needs to be stepped twice, once for
2883 the instruction and once for the delay slot. */
2884 int step_through_delay
2885 = gdbarch_single_step_through_delay (current_gdbarch
,
2886 get_current_frame ());
2887 if (debug_infrun
&& step_through_delay
)
2888 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
2889 if (ecs
->event_thread
->step_range_end
== 0 && step_through_delay
)
2891 /* The user issued a continue when stopped at a breakpoint.
2892 Set up for another trap and get out of here. */
2893 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2897 else if (step_through_delay
)
2899 /* The user issued a step when stopped at a breakpoint.
2900 Maybe we should stop, maybe we should not - the delay
2901 slot *might* correspond to a line of source. In any
2902 case, don't decide that here, just set
2903 ecs->stepping_over_breakpoint, making sure we
2904 single-step again before breakpoints are re-inserted. */
2905 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2909 /* Look at the cause of the stop, and decide what to do.
2910 The alternatives are:
2911 1) stop_stepping and return; to really stop and return to the debugger,
2912 2) keep_going and return to start up again
2913 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
2914 3) set ecs->random_signal to 1, and the decision between 1 and 2
2915 will be made according to the signal handling tables. */
2917 /* First, distinguish signals caused by the debugger from signals
2918 that have to do with the program's own actions. Note that
2919 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
2920 on the operating system version. Here we detect when a SIGILL or
2921 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
2922 something similar for SIGSEGV, since a SIGSEGV will be generated
2923 when we're trying to execute a breakpoint instruction on a
2924 non-executable stack. This happens for call dummy breakpoints
2925 for architectures like SPARC that place call dummies on the
2928 If we're doing a displaced step past a breakpoint, then the
2929 breakpoint is always inserted at the original instruction;
2930 non-standard signals can't be explained by the breakpoint. */
2931 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2932 || (! ecs
->event_thread
->trap_expected
2933 && breakpoint_inserted_here_p (stop_pc
)
2934 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_ILL
2935 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_SEGV
2936 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_EMT
))
2937 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2938 || stop_soon
== STOP_QUIETLY_REMOTE
)
2940 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2943 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
2944 stop_print_frame
= 0;
2945 stop_stepping (ecs
);
2949 /* This is originated from start_remote(), start_inferior() and
2950 shared libraries hook functions. */
2951 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
2954 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
2955 stop_stepping (ecs
);
2959 /* This originates from attach_command(). We need to overwrite
2960 the stop_signal here, because some kernels don't ignore a
2961 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
2962 See more comments in inferior.h. On the other hand, if we
2963 get a non-SIGSTOP, report it to the user - assume the backend
2964 will handle the SIGSTOP if it should show up later.
2966 Also consider that the attach is complete when we see a
2967 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
2968 target extended-remote report it instead of a SIGSTOP
2969 (e.g. gdbserver). We already rely on SIGTRAP being our
2970 signal, so this is no exception.
2972 Also consider that the attach is complete when we see a
2973 TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell
2974 the target to stop all threads of the inferior, in case the
2975 low level attach operation doesn't stop them implicitly. If
2976 they weren't stopped implicitly, then the stub will report a
2977 TARGET_SIGNAL_0, meaning: stopped for no particular reason
2978 other than GDB's request. */
2979 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2980 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_STOP
2981 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2982 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_0
))
2984 stop_stepping (ecs
);
2985 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2989 /* See if there is a breakpoint at the current PC. */
2990 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2992 /* Following in case break condition called a
2994 stop_print_frame
= 1;
2996 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2997 at one stage in the past included checks for an inferior
2998 function call's call dummy's return breakpoint. The original
2999 comment, that went with the test, read:
3001 ``End of a stack dummy. Some systems (e.g. Sony news) give
3002 another signal besides SIGTRAP, so check here as well as
3005 If someone ever tries to get call dummys on a
3006 non-executable stack to work (where the target would stop
3007 with something like a SIGSEGV), then those tests might need
3008 to be re-instated. Given, however, that the tests were only
3009 enabled when momentary breakpoints were not being used, I
3010 suspect that it won't be the case.
3012 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
3013 be necessary for call dummies on a non-executable stack on
3016 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
3018 = !(bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
)
3019 || ecs
->event_thread
->trap_expected
3020 || (ecs
->event_thread
->step_range_end
3021 && ecs
->event_thread
->step_resume_breakpoint
== NULL
));
3024 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
3025 if (!ecs
->random_signal
)
3026 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
3030 /* When we reach this point, we've pretty much decided
3031 that the reason for stopping must've been a random
3032 (unexpected) signal. */
3035 ecs
->random_signal
= 1;
3037 process_event_stop_test
:
3038 /* For the program's own signals, act according to
3039 the signal handling tables. */
3041 if (ecs
->random_signal
)
3043 /* Signal not for debugging purposes. */
3047 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
3048 ecs
->event_thread
->stop_signal
);
3050 stopped_by_random_signal
= 1;
3052 if (signal_print
[ecs
->event_thread
->stop_signal
])
3055 target_terminal_ours_for_output ();
3056 print_stop_reason (SIGNAL_RECEIVED
, ecs
->event_thread
->stop_signal
);
3058 /* Always stop on signals if we're either just gaining control
3059 of the program, or the user explicitly requested this thread
3060 to remain stopped. */
3061 if (stop_soon
!= NO_STOP_QUIETLY
3062 || ecs
->event_thread
->stop_requested
3063 || signal_stop_state (ecs
->event_thread
->stop_signal
))
3065 stop_stepping (ecs
);
3068 /* If not going to stop, give terminal back
3069 if we took it away. */
3071 target_terminal_inferior ();
3073 /* Clear the signal if it should not be passed. */
3074 if (signal_program
[ecs
->event_thread
->stop_signal
] == 0)
3075 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3077 if (ecs
->event_thread
->prev_pc
== read_pc ()
3078 && ecs
->event_thread
->trap_expected
3079 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3081 /* We were just starting a new sequence, attempting to
3082 single-step off of a breakpoint and expecting a SIGTRAP.
3083 Instead this signal arrives. This signal will take us out
3084 of the stepping range so GDB needs to remember to, when
3085 the signal handler returns, resume stepping off that
3087 /* To simplify things, "continue" is forced to use the same
3088 code paths as single-step - set a breakpoint at the
3089 signal return address and then, once hit, step off that
3092 fprintf_unfiltered (gdb_stdlog
,
3093 "infrun: signal arrived while stepping over "
3096 insert_step_resume_breakpoint_at_frame (get_current_frame ());
3097 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
3102 if (ecs
->event_thread
->step_range_end
!= 0
3103 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_0
3104 && (ecs
->event_thread
->step_range_start
<= stop_pc
3105 && stop_pc
< ecs
->event_thread
->step_range_end
)
3106 && frame_id_eq (get_frame_id (get_current_frame ()),
3107 ecs
->event_thread
->step_frame_id
)
3108 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3110 /* The inferior is about to take a signal that will take it
3111 out of the single step range. Set a breakpoint at the
3112 current PC (which is presumably where the signal handler
3113 will eventually return) and then allow the inferior to
3116 Note that this is only needed for a signal delivered
3117 while in the single-step range. Nested signals aren't a
3118 problem as they eventually all return. */
3120 fprintf_unfiltered (gdb_stdlog
,
3121 "infrun: signal may take us out of "
3122 "single-step range\n");
3124 insert_step_resume_breakpoint_at_frame (get_current_frame ());
3129 /* Note: step_resume_breakpoint may be non-NULL. This occures
3130 when either there's a nested signal, or when there's a
3131 pending signal enabled just as the signal handler returns
3132 (leaving the inferior at the step-resume-breakpoint without
3133 actually executing it). Either way continue until the
3134 breakpoint is really hit. */
3139 /* Handle cases caused by hitting a breakpoint. */
3141 CORE_ADDR jmp_buf_pc
;
3142 struct bpstat_what what
;
3144 what
= bpstat_what (ecs
->event_thread
->stop_bpstat
);
3146 if (what
.call_dummy
)
3148 stop_stack_dummy
= 1;
3151 switch (what
.main_action
)
3153 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
3154 /* If we hit the breakpoint at longjmp while stepping, we
3155 install a momentary breakpoint at the target of the
3159 fprintf_unfiltered (gdb_stdlog
,
3160 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
3162 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3164 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
3165 || !gdbarch_get_longjmp_target (current_gdbarch
,
3166 get_current_frame (), &jmp_buf_pc
))
3169 fprintf_unfiltered (gdb_stdlog
, "\
3170 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
3175 /* We're going to replace the current step-resume breakpoint
3176 with a longjmp-resume breakpoint. */
3177 delete_step_resume_breakpoint (ecs
->event_thread
);
3179 /* Insert a breakpoint at resume address. */
3180 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
3185 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
3187 fprintf_unfiltered (gdb_stdlog
,
3188 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
3190 gdb_assert (ecs
->event_thread
->step_resume_breakpoint
!= NULL
);
3191 delete_step_resume_breakpoint (ecs
->event_thread
);
3193 ecs
->event_thread
->stop_step
= 1;
3194 print_stop_reason (END_STEPPING_RANGE
, 0);
3195 stop_stepping (ecs
);
3198 case BPSTAT_WHAT_SINGLE
:
3200 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
3201 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3202 /* Still need to check other stuff, at least the case
3203 where we are stepping and step out of the right range. */
3206 case BPSTAT_WHAT_STOP_NOISY
:
3208 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
3209 stop_print_frame
= 1;
3211 /* We are about to nuke the step_resume_breakpointt via the
3212 cleanup chain, so no need to worry about it here. */
3214 stop_stepping (ecs
);
3217 case BPSTAT_WHAT_STOP_SILENT
:
3219 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
3220 stop_print_frame
= 0;
3222 /* We are about to nuke the step_resume_breakpoin via the
3223 cleanup chain, so no need to worry about it here. */
3225 stop_stepping (ecs
);
3228 case BPSTAT_WHAT_STEP_RESUME
:
3230 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
3232 delete_step_resume_breakpoint (ecs
->event_thread
);
3233 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
3235 /* Back when the step-resume breakpoint was inserted, we
3236 were trying to single-step off a breakpoint. Go back
3238 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
3239 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3243 if (stop_pc
== ecs
->stop_func_start
3244 && execution_direction
== EXEC_REVERSE
)
3246 /* We are stepping over a function call in reverse, and
3247 just hit the step-resume breakpoint at the start
3248 address of the function. Go back to single-stepping,
3249 which should take us back to the function call. */
3250 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3256 case BPSTAT_WHAT_CHECK_SHLIBS
:
3259 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
3261 /* Check for any newly added shared libraries if we're
3262 supposed to be adding them automatically. Switch
3263 terminal for any messages produced by
3264 breakpoint_re_set. */
3265 target_terminal_ours_for_output ();
3266 /* NOTE: cagney/2003-11-25: Make certain that the target
3267 stack's section table is kept up-to-date. Architectures,
3268 (e.g., PPC64), use the section table to perform
3269 operations such as address => section name and hence
3270 require the table to contain all sections (including
3271 those found in shared libraries). */
3272 /* NOTE: cagney/2003-11-25: Pass current_target and not
3273 exec_ops to SOLIB_ADD. This is because current GDB is
3274 only tooled to propagate section_table changes out from
3275 the "current_target" (see target_resize_to_sections), and
3276 not up from the exec stratum. This, of course, isn't
3277 right. "infrun.c" should only interact with the
3278 exec/process stratum, instead relying on the target stack
3279 to propagate relevant changes (stop, section table
3280 changed, ...) up to other layers. */
3282 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
3284 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
3286 target_terminal_inferior ();
3288 /* If requested, stop when the dynamic linker notifies
3289 gdb of events. This allows the user to get control
3290 and place breakpoints in initializer routines for
3291 dynamically loaded objects (among other things). */
3292 if (stop_on_solib_events
|| stop_stack_dummy
)
3294 stop_stepping (ecs
);
3299 /* We want to step over this breakpoint, then keep going. */
3300 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3306 case BPSTAT_WHAT_LAST
:
3307 /* Not a real code, but listed here to shut up gcc -Wall. */
3309 case BPSTAT_WHAT_KEEP_CHECKING
:
3314 /* We come here if we hit a breakpoint but should not
3315 stop for it. Possibly we also were stepping
3316 and should stop for that. So fall through and
3317 test for stepping. But, if not stepping,
3320 /* In all-stop mode, if we're currently stepping but have stopped in
3321 some other thread, we need to switch back to the stepped thread. */
3324 struct thread_info
*tp
;
3325 tp
= iterate_over_threads (currently_stepping_callback
,
3329 /* However, if the current thread is blocked on some internal
3330 breakpoint, and we simply need to step over that breakpoint
3331 to get it going again, do that first. */
3332 if ((ecs
->event_thread
->trap_expected
3333 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
3334 || ecs
->event_thread
->stepping_over_breakpoint
)
3340 /* Otherwise, we no longer expect a trap in the current thread.
3341 Clear the trap_expected flag before switching back -- this is
3342 what keep_going would do as well, if we called it. */
3343 ecs
->event_thread
->trap_expected
= 0;
3346 fprintf_unfiltered (gdb_stdlog
,
3347 "infrun: switching back to stepped thread\n");
3349 ecs
->event_thread
= tp
;
3350 ecs
->ptid
= tp
->ptid
;
3351 context_switch (ecs
->ptid
);
3357 /* Are we stepping to get the inferior out of the dynamic linker's
3358 hook (and possibly the dld itself) after catching a shlib
3360 if (ecs
->event_thread
->stepping_through_solib_after_catch
)
3362 #if defined(SOLIB_ADD)
3363 /* Have we reached our destination? If not, keep going. */
3364 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
3367 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
3368 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3374 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
3375 /* Else, stop and report the catchpoint(s) whose triggering
3376 caused us to begin stepping. */
3377 ecs
->event_thread
->stepping_through_solib_after_catch
= 0;
3378 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3379 ecs
->event_thread
->stop_bpstat
3380 = bpstat_copy (ecs
->event_thread
->stepping_through_solib_catchpoints
);
3381 bpstat_clear (&ecs
->event_thread
->stepping_through_solib_catchpoints
);
3382 stop_print_frame
= 1;
3383 stop_stepping (ecs
);
3387 if (ecs
->event_thread
->step_resume_breakpoint
)
3390 fprintf_unfiltered (gdb_stdlog
,
3391 "infrun: step-resume breakpoint is inserted\n");
3393 /* Having a step-resume breakpoint overrides anything
3394 else having to do with stepping commands until
3395 that breakpoint is reached. */
3400 if (ecs
->event_thread
->step_range_end
== 0)
3403 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
3404 /* Likewise if we aren't even stepping. */
3409 /* If stepping through a line, keep going if still within it.
3411 Note that step_range_end is the address of the first instruction
3412 beyond the step range, and NOT the address of the last instruction
3414 if (stop_pc
>= ecs
->event_thread
->step_range_start
3415 && stop_pc
< ecs
->event_thread
->step_range_end
)
3418 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
3419 paddr_nz (ecs
->event_thread
->step_range_start
),
3420 paddr_nz (ecs
->event_thread
->step_range_end
));
3422 /* When stepping backward, stop at beginning of line range
3423 (unless it's the function entry point, in which case
3424 keep going back to the call point). */
3425 if (stop_pc
== ecs
->event_thread
->step_range_start
3426 && stop_pc
!= ecs
->stop_func_start
3427 && execution_direction
== EXEC_REVERSE
)
3429 ecs
->event_thread
->stop_step
= 1;
3430 print_stop_reason (END_STEPPING_RANGE
, 0);
3431 stop_stepping (ecs
);
3439 /* We stepped out of the stepping range. */
3441 /* If we are stepping at the source level and entered the runtime
3442 loader dynamic symbol resolution code, we keep on single stepping
3443 until we exit the run time loader code and reach the callee's
3445 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3446 && in_solib_dynsym_resolve_code (stop_pc
))
3448 CORE_ADDR pc_after_resolver
=
3449 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
3452 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
3454 if (pc_after_resolver
)
3456 /* Set up a step-resume breakpoint at the address
3457 indicated by SKIP_SOLIB_RESOLVER. */
3458 struct symtab_and_line sr_sal
;
3460 sr_sal
.pc
= pc_after_resolver
;
3462 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3469 if (ecs
->event_thread
->step_range_end
!= 1
3470 && (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3471 || ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3472 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
3475 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
3476 /* The inferior, while doing a "step" or "next", has ended up in
3477 a signal trampoline (either by a signal being delivered or by
3478 the signal handler returning). Just single-step until the
3479 inferior leaves the trampoline (either by calling the handler
3485 /* Check for subroutine calls. The check for the current frame
3486 equalling the step ID is not necessary - the check of the
3487 previous frame's ID is sufficient - but it is a common case and
3488 cheaper than checking the previous frame's ID.
3490 NOTE: frame_id_eq will never report two invalid frame IDs as
3491 being equal, so to get into this block, both the current and
3492 previous frame must have valid frame IDs. */
3493 if (!frame_id_eq (get_frame_id (get_current_frame ()),
3494 ecs
->event_thread
->step_frame_id
)
3495 && (frame_id_eq (frame_unwind_id (get_current_frame ()),
3496 ecs
->event_thread
->step_frame_id
)
3497 || execution_direction
== EXEC_REVERSE
))
3499 CORE_ADDR real_stop_pc
;
3502 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
3504 if ((ecs
->event_thread
->step_over_calls
== STEP_OVER_NONE
)
3505 || ((ecs
->event_thread
->step_range_end
== 1)
3506 && in_prologue (ecs
->event_thread
->prev_pc
,
3507 ecs
->stop_func_start
)))
3509 /* I presume that step_over_calls is only 0 when we're
3510 supposed to be stepping at the assembly language level
3511 ("stepi"). Just stop. */
3512 /* Also, maybe we just did a "nexti" inside a prolog, so we
3513 thought it was a subroutine call but it was not. Stop as
3515 ecs
->event_thread
->stop_step
= 1;
3516 print_stop_reason (END_STEPPING_RANGE
, 0);
3517 stop_stepping (ecs
);
3521 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3523 /* We're doing a "next".
3525 Normal (forward) execution: set a breakpoint at the
3526 callee's return address (the address at which the caller
3529 Reverse (backward) execution. set the step-resume
3530 breakpoint at the start of the function that we just
3531 stepped into (backwards), and continue to there. When we
3532 get there, we'll need to single-step back to the caller. */
3534 if (execution_direction
== EXEC_REVERSE
)
3536 struct symtab_and_line sr_sal
;
3538 if (ecs
->stop_func_start
== 0
3539 && in_solib_dynsym_resolve_code (stop_pc
))
3541 /* Stepped into runtime loader dynamic symbol
3542 resolution code. Since we're in reverse,
3543 we have already backed up through the runtime
3544 loader and the dynamic function. This is just
3545 the trampoline (jump table).
3547 Just keep stepping, we'll soon be home.
3552 /* Normal (staticly linked) function call return. */
3554 sr_sal
.pc
= ecs
->stop_func_start
;
3555 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3558 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3564 /* If we are in a function call trampoline (a stub between the
3565 calling routine and the real function), locate the real
3566 function. That's what tells us (a) whether we want to step
3567 into it at all, and (b) what prologue we want to run to the
3568 end of, if we do step into it. */
3569 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
3570 if (real_stop_pc
== 0)
3571 real_stop_pc
= gdbarch_skip_trampoline_code
3572 (current_gdbarch
, get_current_frame (), stop_pc
);
3573 if (real_stop_pc
!= 0)
3574 ecs
->stop_func_start
= real_stop_pc
;
3576 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
3578 struct symtab_and_line sr_sal
;
3580 sr_sal
.pc
= ecs
->stop_func_start
;
3582 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3587 /* If we have line number information for the function we are
3588 thinking of stepping into, step into it.
3590 If there are several symtabs at that PC (e.g. with include
3591 files), just want to know whether *any* of them have line
3592 numbers. find_pc_line handles this. */
3594 struct symtab_and_line tmp_sal
;
3596 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3597 if (tmp_sal
.line
!= 0)
3599 if (execution_direction
== EXEC_REVERSE
)
3600 handle_step_into_function_backward (ecs
);
3602 handle_step_into_function (ecs
);
3607 /* If we have no line number and the step-stop-if-no-debug is
3608 set, we stop the step so that the user has a chance to switch
3609 in assembly mode. */
3610 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3611 && step_stop_if_no_debug
)
3613 ecs
->event_thread
->stop_step
= 1;
3614 print_stop_reason (END_STEPPING_RANGE
, 0);
3615 stop_stepping (ecs
);
3619 if (execution_direction
== EXEC_REVERSE
)
3621 /* Set a breakpoint at callee's start address.
3622 From there we can step once and be back in the caller. */
3623 struct symtab_and_line sr_sal
;
3625 sr_sal
.pc
= ecs
->stop_func_start
;
3626 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3629 /* Set a breakpoint at callee's return address (the address
3630 at which the caller will resume). */
3631 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3637 /* If we're in the return path from a shared library trampoline,
3638 we want to proceed through the trampoline when stepping. */
3639 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
3640 stop_pc
, ecs
->stop_func_name
))
3642 /* Determine where this trampoline returns. */
3643 CORE_ADDR real_stop_pc
;
3644 real_stop_pc
= gdbarch_skip_trampoline_code
3645 (current_gdbarch
, get_current_frame (), stop_pc
);
3648 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3650 /* Only proceed through if we know where it's going. */
3653 /* And put the step-breakpoint there and go until there. */
3654 struct symtab_and_line sr_sal
;
3656 init_sal (&sr_sal
); /* initialize to zeroes */
3657 sr_sal
.pc
= real_stop_pc
;
3658 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3660 /* Do not specify what the fp should be when we stop since
3661 on some machines the prologue is where the new fp value
3663 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3665 /* Restart without fiddling with the step ranges or
3672 stop_pc_sal
= find_pc_line (stop_pc
, 0);
3674 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3675 the trampoline processing logic, however, there are some trampolines
3676 that have no names, so we should do trampoline handling first. */
3677 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3678 && ecs
->stop_func_name
== NULL
3679 && stop_pc_sal
.line
== 0)
3682 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3684 /* The inferior just stepped into, or returned to, an
3685 undebuggable function (where there is no debugging information
3686 and no line number corresponding to the address where the
3687 inferior stopped). Since we want to skip this kind of code,
3688 we keep going until the inferior returns from this
3689 function - unless the user has asked us not to (via
3690 set step-mode) or we no longer know how to get back
3691 to the call site. */
3692 if (step_stop_if_no_debug
3693 || !frame_id_p (frame_unwind_id (get_current_frame ())))
3695 /* If we have no line number and the step-stop-if-no-debug
3696 is set, we stop the step so that the user has a chance to
3697 switch in assembly mode. */
3698 ecs
->event_thread
->stop_step
= 1;
3699 print_stop_reason (END_STEPPING_RANGE
, 0);
3700 stop_stepping (ecs
);
3705 /* Set a breakpoint at callee's return address (the address
3706 at which the caller will resume). */
3707 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3713 if (ecs
->event_thread
->step_range_end
== 1)
3715 /* It is stepi or nexti. We always want to stop stepping after
3718 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3719 ecs
->event_thread
->stop_step
= 1;
3720 print_stop_reason (END_STEPPING_RANGE
, 0);
3721 stop_stepping (ecs
);
3725 if (stop_pc_sal
.line
== 0)
3727 /* We have no line number information. That means to stop
3728 stepping (does this always happen right after one instruction,
3729 when we do "s" in a function with no line numbers,
3730 or can this happen as a result of a return or longjmp?). */
3732 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3733 ecs
->event_thread
->stop_step
= 1;
3734 print_stop_reason (END_STEPPING_RANGE
, 0);
3735 stop_stepping (ecs
);
3739 if ((stop_pc
== stop_pc_sal
.pc
)
3740 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
3741 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
3743 /* We are at the start of a different line. So stop. Note that
3744 we don't stop if we step into the middle of a different line.
3745 That is said to make things like for (;;) statements work
3748 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3749 ecs
->event_thread
->stop_step
= 1;
3750 print_stop_reason (END_STEPPING_RANGE
, 0);
3751 stop_stepping (ecs
);
3755 /* We aren't done stepping.
3757 Optimize by setting the stepping range to the line.
3758 (We might not be in the original line, but if we entered a
3759 new line in mid-statement, we continue stepping. This makes
3760 things like for(;;) statements work better.) */
3762 ecs
->event_thread
->step_range_start
= stop_pc_sal
.pc
;
3763 ecs
->event_thread
->step_range_end
= stop_pc_sal
.end
;
3764 ecs
->event_thread
->step_frame_id
= get_frame_id (get_current_frame ());
3765 ecs
->event_thread
->current_line
= stop_pc_sal
.line
;
3766 ecs
->event_thread
->current_symtab
= stop_pc_sal
.symtab
;
3769 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
3773 /* Are we in the middle of stepping? */
3776 currently_stepping_thread (struct thread_info
*tp
)
3778 return (tp
->step_range_end
&& tp
->step_resume_breakpoint
== NULL
)
3779 || tp
->trap_expected
3780 || tp
->stepping_through_solib_after_catch
;
3784 currently_stepping_callback (struct thread_info
*tp
, void *data
)
3786 /* Return true if any thread *but* the one passed in "data" is
3787 in the middle of stepping. */
3788 return tp
!= data
&& currently_stepping_thread (tp
);
3792 currently_stepping (struct thread_info
*tp
)
3794 return currently_stepping_thread (tp
) || bpstat_should_step ();
3797 /* Inferior has stepped into a subroutine call with source code that
3798 we should not step over. Do step to the first line of code in
3802 handle_step_into_function (struct execution_control_state
*ecs
)
3805 struct symtab_and_line stop_func_sal
, sr_sal
;
3807 s
= find_pc_symtab (stop_pc
);
3808 if (s
&& s
->language
!= language_asm
)
3809 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3810 ecs
->stop_func_start
);
3812 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3813 /* Use the step_resume_break to step until the end of the prologue,
3814 even if that involves jumps (as it seems to on the vax under
3816 /* If the prologue ends in the middle of a source line, continue to
3817 the end of that source line (if it is still within the function).
3818 Otherwise, just go to end of prologue. */
3819 if (stop_func_sal
.end
3820 && stop_func_sal
.pc
!= ecs
->stop_func_start
3821 && stop_func_sal
.end
< ecs
->stop_func_end
)
3822 ecs
->stop_func_start
= stop_func_sal
.end
;
3824 /* Architectures which require breakpoint adjustment might not be able
3825 to place a breakpoint at the computed address. If so, the test
3826 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
3827 ecs->stop_func_start to an address at which a breakpoint may be
3828 legitimately placed.
3830 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
3831 made, GDB will enter an infinite loop when stepping through
3832 optimized code consisting of VLIW instructions which contain
3833 subinstructions corresponding to different source lines. On
3834 FR-V, it's not permitted to place a breakpoint on any but the
3835 first subinstruction of a VLIW instruction. When a breakpoint is
3836 set, GDB will adjust the breakpoint address to the beginning of
3837 the VLIW instruction. Thus, we need to make the corresponding
3838 adjustment here when computing the stop address. */
3840 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
3842 ecs
->stop_func_start
3843 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
3844 ecs
->stop_func_start
);
3847 if (ecs
->stop_func_start
== stop_pc
)
3849 /* We are already there: stop now. */
3850 ecs
->event_thread
->stop_step
= 1;
3851 print_stop_reason (END_STEPPING_RANGE
, 0);
3852 stop_stepping (ecs
);
3857 /* Put the step-breakpoint there and go until there. */
3858 init_sal (&sr_sal
); /* initialize to zeroes */
3859 sr_sal
.pc
= ecs
->stop_func_start
;
3860 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3862 /* Do not specify what the fp should be when we stop since on
3863 some machines the prologue is where the new fp value is
3865 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3867 /* And make sure stepping stops right away then. */
3868 ecs
->event_thread
->step_range_end
= ecs
->event_thread
->step_range_start
;
3873 /* Inferior has stepped backward into a subroutine call with source
3874 code that we should not step over. Do step to the beginning of the
3875 last line of code in it. */
3878 handle_step_into_function_backward (struct execution_control_state
*ecs
)
3881 struct symtab_and_line stop_func_sal
, sr_sal
;
3883 s
= find_pc_symtab (stop_pc
);
3884 if (s
&& s
->language
!= language_asm
)
3885 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3886 ecs
->stop_func_start
);
3888 stop_func_sal
= find_pc_line (stop_pc
, 0);
3890 /* OK, we're just going to keep stepping here. */
3891 if (stop_func_sal
.pc
== stop_pc
)
3893 /* We're there already. Just stop stepping now. */
3894 ecs
->event_thread
->stop_step
= 1;
3895 print_stop_reason (END_STEPPING_RANGE
, 0);
3896 stop_stepping (ecs
);
3900 /* Else just reset the step range and keep going.
3901 No step-resume breakpoint, they don't work for
3902 epilogues, which can have multiple entry paths. */
3903 ecs
->event_thread
->step_range_start
= stop_func_sal
.pc
;
3904 ecs
->event_thread
->step_range_end
= stop_func_sal
.end
;
3910 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
3911 This is used to both functions and to skip over code. */
3914 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
3915 struct frame_id sr_id
)
3917 /* There should never be more than one step-resume or longjmp-resume
3918 breakpoint per thread, so we should never be setting a new
3919 step_resume_breakpoint when one is already active. */
3920 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3923 fprintf_unfiltered (gdb_stdlog
,
3924 "infrun: inserting step-resume breakpoint at 0x%s\n",
3925 paddr_nz (sr_sal
.pc
));
3927 inferior_thread ()->step_resume_breakpoint
3928 = set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
3931 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
3932 to skip a potential signal handler.
3934 This is called with the interrupted function's frame. The signal
3935 handler, when it returns, will resume the interrupted function at
3939 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
3941 struct symtab_and_line sr_sal
;
3943 gdb_assert (return_frame
!= NULL
);
3944 init_sal (&sr_sal
); /* initialize to zeros */
3946 sr_sal
.pc
= gdbarch_addr_bits_remove
3947 (current_gdbarch
, get_frame_pc (return_frame
));
3948 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3950 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
3953 /* Similar to insert_step_resume_breakpoint_at_frame, except
3954 but a breakpoint at the previous frame's PC. This is used to
3955 skip a function after stepping into it (for "next" or if the called
3956 function has no debugging information).
3958 The current function has almost always been reached by single
3959 stepping a call or return instruction. NEXT_FRAME belongs to the
3960 current function, and the breakpoint will be set at the caller's
3963 This is a separate function rather than reusing
3964 insert_step_resume_breakpoint_at_frame in order to avoid
3965 get_prev_frame, which may stop prematurely (see the implementation
3966 of frame_unwind_id for an example). */
3969 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
3971 struct symtab_and_line sr_sal
;
3973 /* We shouldn't have gotten here if we don't know where the call site
3975 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
3977 init_sal (&sr_sal
); /* initialize to zeros */
3979 sr_sal
.pc
= gdbarch_addr_bits_remove
3980 (current_gdbarch
, frame_pc_unwind (next_frame
));
3981 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3983 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
3986 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
3987 new breakpoint at the target of a jmp_buf. The handling of
3988 longjmp-resume uses the same mechanisms used for handling
3989 "step-resume" breakpoints. */
3992 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
3994 /* There should never be more than one step-resume or longjmp-resume
3995 breakpoint per thread, so we should never be setting a new
3996 longjmp_resume_breakpoint when one is already active. */
3997 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
4000 fprintf_unfiltered (gdb_stdlog
,
4001 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
4004 inferior_thread ()->step_resume_breakpoint
=
4005 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
4009 stop_stepping (struct execution_control_state
*ecs
)
4012 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
4014 /* Let callers know we don't want to wait for the inferior anymore. */
4015 ecs
->wait_some_more
= 0;
4018 /* This function handles various cases where we need to continue
4019 waiting for the inferior. */
4020 /* (Used to be the keep_going: label in the old wait_for_inferior) */
4023 keep_going (struct execution_control_state
*ecs
)
4025 /* Save the pc before execution, to compare with pc after stop. */
4026 ecs
->event_thread
->prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
4028 /* If we did not do break;, it means we should keep running the
4029 inferior and not return to debugger. */
4031 if (ecs
->event_thread
->trap_expected
4032 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
4034 /* We took a signal (which we are supposed to pass through to
4035 the inferior, else we'd not get here) and we haven't yet
4036 gotten our trap. Simply continue. */
4037 resume (currently_stepping (ecs
->event_thread
),
4038 ecs
->event_thread
->stop_signal
);
4042 /* Either the trap was not expected, but we are continuing
4043 anyway (the user asked that this signal be passed to the
4046 The signal was SIGTRAP, e.g. it was our signal, but we
4047 decided we should resume from it.
4049 We're going to run this baby now!
4051 Note that insert_breakpoints won't try to re-insert
4052 already inserted breakpoints. Therefore, we don't
4053 care if breakpoints were already inserted, or not. */
4055 if (ecs
->event_thread
->stepping_over_breakpoint
)
4057 if (! use_displaced_stepping (current_gdbarch
))
4058 /* Since we can't do a displaced step, we have to remove
4059 the breakpoint while we step it. To keep things
4060 simple, we remove them all. */
4061 remove_breakpoints ();
4065 struct gdb_exception e
;
4066 /* Stop stepping when inserting breakpoints
4068 TRY_CATCH (e
, RETURN_MASK_ERROR
)
4070 insert_breakpoints ();
4074 stop_stepping (ecs
);
4079 ecs
->event_thread
->trap_expected
= ecs
->event_thread
->stepping_over_breakpoint
;
4081 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
4082 specifies that such a signal should be delivered to the
4085 Typically, this would occure when a user is debugging a
4086 target monitor on a simulator: the target monitor sets a
4087 breakpoint; the simulator encounters this break-point and
4088 halts the simulation handing control to GDB; GDB, noteing
4089 that the break-point isn't valid, returns control back to the
4090 simulator; the simulator then delivers the hardware
4091 equivalent of a SIGNAL_TRAP to the program being debugged. */
4093 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
4094 && !signal_program
[ecs
->event_thread
->stop_signal
])
4095 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
4097 resume (currently_stepping (ecs
->event_thread
),
4098 ecs
->event_thread
->stop_signal
);
4101 prepare_to_wait (ecs
);
4104 /* This function normally comes after a resume, before
4105 handle_inferior_event exits. It takes care of any last bits of
4106 housekeeping, and sets the all-important wait_some_more flag. */
4109 prepare_to_wait (struct execution_control_state
*ecs
)
4112 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
4113 if (infwait_state
== infwait_normal_state
)
4115 overlay_cache_invalid
= 1;
4117 /* We have to invalidate the registers BEFORE calling
4118 target_wait because they can be loaded from the target while
4119 in target_wait. This makes remote debugging a bit more
4120 efficient for those targets that provide critical registers
4121 as part of their normal status mechanism. */
4123 registers_changed ();
4124 waiton_ptid
= pid_to_ptid (-1);
4126 /* This is the old end of the while loop. Let everybody know we
4127 want to wait for the inferior some more and get called again
4129 ecs
->wait_some_more
= 1;
4132 /* Print why the inferior has stopped. We always print something when
4133 the inferior exits, or receives a signal. The rest of the cases are
4134 dealt with later on in normal_stop() and print_it_typical(). Ideally
4135 there should be a call to this function from handle_inferior_event()
4136 each time stop_stepping() is called.*/
4138 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
4140 switch (stop_reason
)
4142 case END_STEPPING_RANGE
:
4143 /* We are done with a step/next/si/ni command. */
4144 /* For now print nothing. */
4145 /* Print a message only if not in the middle of doing a "step n"
4146 operation for n > 1 */
4147 if (!inferior_thread ()->step_multi
4148 || !inferior_thread ()->stop_step
)
4149 if (ui_out_is_mi_like_p (uiout
))
4152 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
4155 /* The inferior was terminated by a signal. */
4156 annotate_signalled ();
4157 if (ui_out_is_mi_like_p (uiout
))
4160 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
4161 ui_out_text (uiout
, "\nProgram terminated with signal ");
4162 annotate_signal_name ();
4163 ui_out_field_string (uiout
, "signal-name",
4164 target_signal_to_name (stop_info
));
4165 annotate_signal_name_end ();
4166 ui_out_text (uiout
, ", ");
4167 annotate_signal_string ();
4168 ui_out_field_string (uiout
, "signal-meaning",
4169 target_signal_to_string (stop_info
));
4170 annotate_signal_string_end ();
4171 ui_out_text (uiout
, ".\n");
4172 ui_out_text (uiout
, "The program no longer exists.\n");
4175 /* The inferior program is finished. */
4176 annotate_exited (stop_info
);
4179 if (ui_out_is_mi_like_p (uiout
))
4180 ui_out_field_string (uiout
, "reason",
4181 async_reason_lookup (EXEC_ASYNC_EXITED
));
4182 ui_out_text (uiout
, "\nProgram exited with code ");
4183 ui_out_field_fmt (uiout
, "exit-code", "0%o",
4184 (unsigned int) stop_info
);
4185 ui_out_text (uiout
, ".\n");
4189 if (ui_out_is_mi_like_p (uiout
))
4192 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
4193 ui_out_text (uiout
, "\nProgram exited normally.\n");
4195 /* Support the --return-child-result option. */
4196 return_child_result_value
= stop_info
;
4198 case SIGNAL_RECEIVED
:
4199 /* Signal received. The signal table tells us to print about
4203 if (stop_info
== TARGET_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
4205 struct thread_info
*t
= inferior_thread ();
4207 ui_out_text (uiout
, "\n[");
4208 ui_out_field_string (uiout
, "thread-name",
4209 target_pid_to_str (t
->ptid
));
4210 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
4211 ui_out_text (uiout
, " stopped");
4215 ui_out_text (uiout
, "\nProgram received signal ");
4216 annotate_signal_name ();
4217 if (ui_out_is_mi_like_p (uiout
))
4219 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
4220 ui_out_field_string (uiout
, "signal-name",
4221 target_signal_to_name (stop_info
));
4222 annotate_signal_name_end ();
4223 ui_out_text (uiout
, ", ");
4224 annotate_signal_string ();
4225 ui_out_field_string (uiout
, "signal-meaning",
4226 target_signal_to_string (stop_info
));
4227 annotate_signal_string_end ();
4229 ui_out_text (uiout
, ".\n");
4232 /* Reverse execution: target ran out of history info. */
4233 ui_out_text (uiout
, "\nNo more reverse-execution history.\n");
4236 internal_error (__FILE__
, __LINE__
,
4237 _("print_stop_reason: unrecognized enum value"));
4243 /* Here to return control to GDB when the inferior stops for real.
4244 Print appropriate messages, remove breakpoints, give terminal our modes.
4246 STOP_PRINT_FRAME nonzero means print the executing frame
4247 (pc, function, args, file, line number and line text).
4248 BREAKPOINTS_FAILED nonzero means stop was due to error
4249 attempting to insert breakpoints. */
4254 struct target_waitstatus last
;
4256 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
4258 get_last_target_status (&last_ptid
, &last
);
4260 /* If an exception is thrown from this point on, make sure to
4261 propagate GDB's knowledge of the executing state to the
4262 frontend/user running state. A QUIT is an easy exception to see
4263 here, so do this before any filtered output. */
4264 if (target_has_execution
)
4267 make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
4268 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4269 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4270 make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
4273 /* In non-stop mode, we don't want GDB to switch threads behind the
4274 user's back, to avoid races where the user is typing a command to
4275 apply to thread x, but GDB switches to thread y before the user
4276 finishes entering the command. */
4278 /* As with the notification of thread events, we want to delay
4279 notifying the user that we've switched thread context until
4280 the inferior actually stops.
4282 There's no point in saying anything if the inferior has exited.
4283 Note that SIGNALLED here means "exited with a signal", not
4284 "received a signal". */
4286 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
4287 && target_has_execution
4288 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4289 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4291 target_terminal_ours_for_output ();
4292 printf_filtered (_("[Switching to %s]\n"),
4293 target_pid_to_str (inferior_ptid
));
4294 annotate_thread_changed ();
4295 previous_inferior_ptid
= inferior_ptid
;
4298 if (!breakpoints_always_inserted_mode () && target_has_execution
)
4300 if (remove_breakpoints ())
4302 target_terminal_ours_for_output ();
4303 printf_filtered (_("\
4304 Cannot remove breakpoints because program is no longer writable.\n\
4305 Further execution is probably impossible.\n"));
4309 /* If an auto-display called a function and that got a signal,
4310 delete that auto-display to avoid an infinite recursion. */
4312 if (stopped_by_random_signal
)
4313 disable_current_display ();
4315 /* Don't print a message if in the middle of doing a "step n"
4316 operation for n > 1 */
4317 if (target_has_execution
4318 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4319 && last
.kind
!= TARGET_WAITKIND_EXITED
4320 && inferior_thread ()->step_multi
4321 && inferior_thread ()->stop_step
)
4324 target_terminal_ours ();
4326 /* Set the current source location. This will also happen if we
4327 display the frame below, but the current SAL will be incorrect
4328 during a user hook-stop function. */
4329 if (has_stack_frames () && !stop_stack_dummy
)
4330 set_current_sal_from_frame (get_current_frame (), 1);
4332 /* Let the user/frontend see the threads as stopped. */
4333 do_cleanups (old_chain
);
4335 /* Look up the hook_stop and run it (CLI internally handles problem
4336 of stop_command's pre-hook not existing). */
4338 catch_errors (hook_stop_stub
, stop_command
,
4339 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
4341 if (!has_stack_frames ())
4344 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
4345 || last
.kind
== TARGET_WAITKIND_EXITED
)
4348 /* Select innermost stack frame - i.e., current frame is frame 0,
4349 and current location is based on that.
4350 Don't do this on return from a stack dummy routine,
4351 or if the program has exited. */
4353 if (!stop_stack_dummy
)
4355 select_frame (get_current_frame ());
4357 /* Print current location without a level number, if
4358 we have changed functions or hit a breakpoint.
4359 Print source line if we have one.
4360 bpstat_print() contains the logic deciding in detail
4361 what to print, based on the event(s) that just occurred. */
4363 /* If --batch-silent is enabled then there's no need to print the current
4364 source location, and to try risks causing an error message about
4365 missing source files. */
4366 if (stop_print_frame
&& !batch_silent
)
4370 int do_frame_printing
= 1;
4371 struct thread_info
*tp
= inferior_thread ();
4373 bpstat_ret
= bpstat_print (tp
->stop_bpstat
);
4377 /* If we had hit a shared library event breakpoint,
4378 bpstat_print would print out this message. If we hit
4379 an OS-level shared library event, do the same
4381 if (last
.kind
== TARGET_WAITKIND_LOADED
)
4383 printf_filtered (_("Stopped due to shared library event\n"));
4384 source_flag
= SRC_LINE
; /* something bogus */
4385 do_frame_printing
= 0;
4389 /* FIXME: cagney/2002-12-01: Given that a frame ID does
4390 (or should) carry around the function and does (or
4391 should) use that when doing a frame comparison. */
4393 && frame_id_eq (tp
->step_frame_id
,
4394 get_frame_id (get_current_frame ()))
4395 && step_start_function
== find_pc_function (stop_pc
))
4396 source_flag
= SRC_LINE
; /* finished step, just print source line */
4398 source_flag
= SRC_AND_LOC
; /* print location and source line */
4400 case PRINT_SRC_AND_LOC
:
4401 source_flag
= SRC_AND_LOC
; /* print location and source line */
4403 case PRINT_SRC_ONLY
:
4404 source_flag
= SRC_LINE
;
4407 source_flag
= SRC_LINE
; /* something bogus */
4408 do_frame_printing
= 0;
4411 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
4414 /* The behavior of this routine with respect to the source
4416 SRC_LINE: Print only source line
4417 LOCATION: Print only location
4418 SRC_AND_LOC: Print location and source line */
4419 if (do_frame_printing
)
4420 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
4422 /* Display the auto-display expressions. */
4427 /* Save the function value return registers, if we care.
4428 We might be about to restore their previous contents. */
4429 if (inferior_thread ()->proceed_to_finish
)
4431 /* This should not be necessary. */
4433 regcache_xfree (stop_registers
);
4435 /* NB: The copy goes through to the target picking up the value of
4436 all the registers. */
4437 stop_registers
= regcache_dup (get_current_regcache ());
4440 if (stop_stack_dummy
)
4442 /* Pop the empty frame that contains the stack dummy.
4443 This also restores inferior state prior to the call
4444 (struct inferior_thread_state). */
4445 struct frame_info
*frame
= get_current_frame ();
4446 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
4448 /* frame_pop() calls reinit_frame_cache as the last thing it does
4449 which means there's currently no selected frame. We don't need
4450 to re-establish a selected frame if the dummy call returns normally,
4451 that will be done by restore_inferior_status. However, we do have
4452 to handle the case where the dummy call is returning after being
4453 stopped (e.g. the dummy call previously hit a breakpoint). We
4454 can't know which case we have so just always re-establish a
4455 selected frame here. */
4456 select_frame (get_current_frame ());
4460 annotate_stopped ();
4462 /* Suppress the stop observer if we're in the middle of:
4464 - a step n (n > 1), as there still more steps to be done.
4466 - a "finish" command, as the observer will be called in
4467 finish_command_continuation, so it can include the inferior
4468 function's return value.
4470 - calling an inferior function, as we pretend we inferior didn't
4471 run at all. The return value of the call is handled by the
4472 expression evaluator, through call_function_by_hand. */
4474 if (!target_has_execution
4475 || last
.kind
== TARGET_WAITKIND_SIGNALLED
4476 || last
.kind
== TARGET_WAITKIND_EXITED
4477 || (!inferior_thread ()->step_multi
4478 && !(inferior_thread ()->stop_bpstat
4479 && inferior_thread ()->proceed_to_finish
)
4480 && !inferior_thread ()->in_infcall
))
4482 if (!ptid_equal (inferior_ptid
, null_ptid
))
4483 observer_notify_normal_stop (inferior_thread ()->stop_bpstat
,
4486 observer_notify_normal_stop (NULL
, stop_print_frame
);
4489 if (target_has_execution
)
4491 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4492 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4493 /* Delete the breakpoint we stopped at, if it wants to be deleted.
4494 Delete any breakpoint that is to be deleted at the next stop. */
4495 breakpoint_auto_delete (inferior_thread ()->stop_bpstat
);
4500 hook_stop_stub (void *cmd
)
4502 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
4507 signal_stop_state (int signo
)
4509 return signal_stop
[signo
];
4513 signal_print_state (int signo
)
4515 return signal_print
[signo
];
4519 signal_pass_state (int signo
)
4521 return signal_program
[signo
];
4525 signal_stop_update (int signo
, int state
)
4527 int ret
= signal_stop
[signo
];
4528 signal_stop
[signo
] = state
;
4533 signal_print_update (int signo
, int state
)
4535 int ret
= signal_print
[signo
];
4536 signal_print
[signo
] = state
;
4541 signal_pass_update (int signo
, int state
)
4543 int ret
= signal_program
[signo
];
4544 signal_program
[signo
] = state
;
4549 sig_print_header (void)
4551 printf_filtered (_("\
4552 Signal Stop\tPrint\tPass to program\tDescription\n"));
4556 sig_print_info (enum target_signal oursig
)
4558 const char *name
= target_signal_to_name (oursig
);
4559 int name_padding
= 13 - strlen (name
);
4561 if (name_padding
<= 0)
4564 printf_filtered ("%s", name
);
4565 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
4566 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
4567 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
4568 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
4569 printf_filtered ("%s\n", target_signal_to_string (oursig
));
4572 /* Specify how various signals in the inferior should be handled. */
4575 handle_command (char *args
, int from_tty
)
4578 int digits
, wordlen
;
4579 int sigfirst
, signum
, siglast
;
4580 enum target_signal oursig
;
4583 unsigned char *sigs
;
4584 struct cleanup
*old_chain
;
4588 error_no_arg (_("signal to handle"));
4591 /* Allocate and zero an array of flags for which signals to handle. */
4593 nsigs
= (int) TARGET_SIGNAL_LAST
;
4594 sigs
= (unsigned char *) alloca (nsigs
);
4595 memset (sigs
, 0, nsigs
);
4597 /* Break the command line up into args. */
4599 argv
= gdb_buildargv (args
);
4600 old_chain
= make_cleanup_freeargv (argv
);
4602 /* Walk through the args, looking for signal oursigs, signal names, and
4603 actions. Signal numbers and signal names may be interspersed with
4604 actions, with the actions being performed for all signals cumulatively
4605 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
4607 while (*argv
!= NULL
)
4609 wordlen
= strlen (*argv
);
4610 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
4614 sigfirst
= siglast
= -1;
4616 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
4618 /* Apply action to all signals except those used by the
4619 debugger. Silently skip those. */
4622 siglast
= nsigs
- 1;
4624 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
4626 SET_SIGS (nsigs
, sigs
, signal_stop
);
4627 SET_SIGS (nsigs
, sigs
, signal_print
);
4629 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
4631 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4633 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
4635 SET_SIGS (nsigs
, sigs
, signal_print
);
4637 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
4639 SET_SIGS (nsigs
, sigs
, signal_program
);
4641 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
4643 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4645 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
4647 SET_SIGS (nsigs
, sigs
, signal_program
);
4649 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
4651 UNSET_SIGS (nsigs
, sigs
, signal_print
);
4652 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4654 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
4656 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4658 else if (digits
> 0)
4660 /* It is numeric. The numeric signal refers to our own
4661 internal signal numbering from target.h, not to host/target
4662 signal number. This is a feature; users really should be
4663 using symbolic names anyway, and the common ones like
4664 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
4666 sigfirst
= siglast
= (int)
4667 target_signal_from_command (atoi (*argv
));
4668 if ((*argv
)[digits
] == '-')
4671 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
4673 if (sigfirst
> siglast
)
4675 /* Bet he didn't figure we'd think of this case... */
4683 oursig
= target_signal_from_name (*argv
);
4684 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
4686 sigfirst
= siglast
= (int) oursig
;
4690 /* Not a number and not a recognized flag word => complain. */
4691 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
4695 /* If any signal numbers or symbol names were found, set flags for
4696 which signals to apply actions to. */
4698 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
4700 switch ((enum target_signal
) signum
)
4702 case TARGET_SIGNAL_TRAP
:
4703 case TARGET_SIGNAL_INT
:
4704 if (!allsigs
&& !sigs
[signum
])
4706 if (query (_("%s is used by the debugger.\n\
4707 Are you sure you want to change it? "), target_signal_to_name ((enum target_signal
) signum
)))
4713 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4714 gdb_flush (gdb_stdout
);
4718 case TARGET_SIGNAL_0
:
4719 case TARGET_SIGNAL_DEFAULT
:
4720 case TARGET_SIGNAL_UNKNOWN
:
4721 /* Make sure that "all" doesn't print these. */
4732 for (signum
= 0; signum
< nsigs
; signum
++)
4735 target_notice_signals (inferior_ptid
);
4739 /* Show the results. */
4740 sig_print_header ();
4741 for (; signum
< nsigs
; signum
++)
4743 sig_print_info (signum
);
4749 do_cleanups (old_chain
);
4753 xdb_handle_command (char *args
, int from_tty
)
4756 struct cleanup
*old_chain
;
4759 error_no_arg (_("xdb command"));
4761 /* Break the command line up into args. */
4763 argv
= gdb_buildargv (args
);
4764 old_chain
= make_cleanup_freeargv (argv
);
4765 if (argv
[1] != (char *) NULL
)
4770 bufLen
= strlen (argv
[0]) + 20;
4771 argBuf
= (char *) xmalloc (bufLen
);
4775 enum target_signal oursig
;
4777 oursig
= target_signal_from_name (argv
[0]);
4778 memset (argBuf
, 0, bufLen
);
4779 if (strcmp (argv
[1], "Q") == 0)
4780 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4783 if (strcmp (argv
[1], "s") == 0)
4785 if (!signal_stop
[oursig
])
4786 sprintf (argBuf
, "%s %s", argv
[0], "stop");
4788 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
4790 else if (strcmp (argv
[1], "i") == 0)
4792 if (!signal_program
[oursig
])
4793 sprintf (argBuf
, "%s %s", argv
[0], "pass");
4795 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
4797 else if (strcmp (argv
[1], "r") == 0)
4799 if (!signal_print
[oursig
])
4800 sprintf (argBuf
, "%s %s", argv
[0], "print");
4802 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4808 handle_command (argBuf
, from_tty
);
4810 printf_filtered (_("Invalid signal handling flag.\n"));
4815 do_cleanups (old_chain
);
4818 /* Print current contents of the tables set by the handle command.
4819 It is possible we should just be printing signals actually used
4820 by the current target (but for things to work right when switching
4821 targets, all signals should be in the signal tables). */
4824 signals_info (char *signum_exp
, int from_tty
)
4826 enum target_signal oursig
;
4827 sig_print_header ();
4831 /* First see if this is a symbol name. */
4832 oursig
= target_signal_from_name (signum_exp
);
4833 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
4835 /* No, try numeric. */
4837 target_signal_from_command (parse_and_eval_long (signum_exp
));
4839 sig_print_info (oursig
);
4843 printf_filtered ("\n");
4844 /* These ugly casts brought to you by the native VAX compiler. */
4845 for (oursig
= TARGET_SIGNAL_FIRST
;
4846 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
4847 oursig
= (enum target_signal
) ((int) oursig
+ 1))
4851 if (oursig
!= TARGET_SIGNAL_UNKNOWN
4852 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
4853 sig_print_info (oursig
);
4856 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
4859 /* The $_siginfo convenience variable is a bit special. We don't know
4860 for sure the type of the value until we actually have a chance to
4861 fetch the data. The type can change depending on gdbarch, so it it
4862 also dependent on which thread you have selected.
4864 1. making $_siginfo be an internalvar that creates a new value on
4867 2. making the value of $_siginfo be an lval_computed value. */
4869 /* This function implements the lval_computed support for reading a
4873 siginfo_value_read (struct value
*v
)
4875 LONGEST transferred
;
4878 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
4880 value_contents_all_raw (v
),
4882 TYPE_LENGTH (value_type (v
)));
4884 if (transferred
!= TYPE_LENGTH (value_type (v
)))
4885 error (_("Unable to read siginfo"));
4888 /* This function implements the lval_computed support for writing a
4892 siginfo_value_write (struct value
*v
, struct value
*fromval
)
4894 LONGEST transferred
;
4896 transferred
= target_write (¤t_target
,
4897 TARGET_OBJECT_SIGNAL_INFO
,
4899 value_contents_all_raw (fromval
),
4901 TYPE_LENGTH (value_type (fromval
)));
4903 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
4904 error (_("Unable to write siginfo"));
4907 static struct lval_funcs siginfo_value_funcs
=
4913 /* Return a new value with the correct type for the siginfo object of
4914 the current thread. Return a void value if there's no object
4917 static struct value
*
4918 siginfo_make_value (struct internalvar
*var
)
4921 struct gdbarch
*gdbarch
;
4923 if (target_has_stack
4924 && !ptid_equal (inferior_ptid
, null_ptid
))
4926 gdbarch
= get_frame_arch (get_current_frame ());
4928 if (gdbarch_get_siginfo_type_p (gdbarch
))
4930 type
= gdbarch_get_siginfo_type (gdbarch
);
4932 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
4936 return allocate_value (builtin_type_void
);
4940 /* Inferior thread state.
4941 These are details related to the inferior itself, and don't include
4942 things like what frame the user had selected or what gdb was doing
4943 with the target at the time.
4944 For inferior function calls these are things we want to restore
4945 regardless of whether the function call successfully completes
4946 or the dummy frame has to be manually popped. */
4948 struct inferior_thread_state
4950 enum target_signal stop_signal
;
4952 struct regcache
*registers
;
4955 struct inferior_thread_state
*
4956 save_inferior_thread_state (void)
4958 struct inferior_thread_state
*inf_state
= XMALLOC (struct inferior_thread_state
);
4959 struct thread_info
*tp
= inferior_thread ();
4961 inf_state
->stop_signal
= tp
->stop_signal
;
4962 inf_state
->stop_pc
= stop_pc
;
4964 inf_state
->registers
= regcache_dup (get_current_regcache ());
4969 /* Restore inferior session state to INF_STATE. */
4972 restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
4974 struct thread_info
*tp
= inferior_thread ();
4976 tp
->stop_signal
= inf_state
->stop_signal
;
4977 stop_pc
= inf_state
->stop_pc
;
4979 /* The inferior can be gone if the user types "print exit(0)"
4980 (and perhaps other times). */
4981 if (target_has_execution
)
4982 /* NB: The register write goes through to the target. */
4983 regcache_cpy (get_current_regcache (), inf_state
->registers
);
4984 regcache_xfree (inf_state
->registers
);
4989 do_restore_inferior_thread_state_cleanup (void *state
)
4991 restore_inferior_thread_state (state
);
4995 make_cleanup_restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
4997 return make_cleanup (do_restore_inferior_thread_state_cleanup
, inf_state
);
5001 discard_inferior_thread_state (struct inferior_thread_state
*inf_state
)
5003 regcache_xfree (inf_state
->registers
);
5008 get_inferior_thread_state_regcache (struct inferior_thread_state
*inf_state
)
5010 return inf_state
->registers
;
5013 /* Session related state for inferior function calls.
5014 These are the additional bits of state that need to be restored
5015 when an inferior function call successfully completes. */
5017 struct inferior_status
5021 int stop_stack_dummy
;
5022 int stopped_by_random_signal
;
5023 int stepping_over_breakpoint
;
5024 CORE_ADDR step_range_start
;
5025 CORE_ADDR step_range_end
;
5026 struct frame_id step_frame_id
;
5027 enum step_over_calls_kind step_over_calls
;
5028 CORE_ADDR step_resume_break_address
;
5029 int stop_after_trap
;
5032 /* ID if the selected frame when the inferior function call was made. */
5033 struct frame_id selected_frame_id
;
5035 int proceed_to_finish
;
5039 /* Save all of the information associated with the inferior<==>gdb
5042 struct inferior_status
*
5043 save_inferior_status (void)
5045 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
5046 struct thread_info
*tp
= inferior_thread ();
5047 struct inferior
*inf
= current_inferior ();
5049 inf_status
->stop_step
= tp
->stop_step
;
5050 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
5051 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
5052 inf_status
->stepping_over_breakpoint
= tp
->trap_expected
;
5053 inf_status
->step_range_start
= tp
->step_range_start
;
5054 inf_status
->step_range_end
= tp
->step_range_end
;
5055 inf_status
->step_frame_id
= tp
->step_frame_id
;
5056 inf_status
->step_over_calls
= tp
->step_over_calls
;
5057 inf_status
->stop_after_trap
= stop_after_trap
;
5058 inf_status
->stop_soon
= inf
->stop_soon
;
5059 /* Save original bpstat chain here; replace it with copy of chain.
5060 If caller's caller is walking the chain, they'll be happier if we
5061 hand them back the original chain when restore_inferior_status is
5063 inf_status
->stop_bpstat
= tp
->stop_bpstat
;
5064 tp
->stop_bpstat
= bpstat_copy (tp
->stop_bpstat
);
5065 inf_status
->proceed_to_finish
= tp
->proceed_to_finish
;
5066 inf_status
->in_infcall
= tp
->in_infcall
;
5068 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
5074 restore_selected_frame (void *args
)
5076 struct frame_id
*fid
= (struct frame_id
*) args
;
5077 struct frame_info
*frame
;
5079 frame
= frame_find_by_id (*fid
);
5081 /* If inf_status->selected_frame_id is NULL, there was no previously
5085 warning (_("Unable to restore previously selected frame."));
5089 select_frame (frame
);
5094 /* Restore inferior session state to INF_STATUS. */
5097 restore_inferior_status (struct inferior_status
*inf_status
)
5099 struct thread_info
*tp
= inferior_thread ();
5100 struct inferior
*inf
= current_inferior ();
5102 tp
->stop_step
= inf_status
->stop_step
;
5103 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
5104 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
5105 tp
->trap_expected
= inf_status
->stepping_over_breakpoint
;
5106 tp
->step_range_start
= inf_status
->step_range_start
;
5107 tp
->step_range_end
= inf_status
->step_range_end
;
5108 tp
->step_frame_id
= inf_status
->step_frame_id
;
5109 tp
->step_over_calls
= inf_status
->step_over_calls
;
5110 stop_after_trap
= inf_status
->stop_after_trap
;
5111 inf
->stop_soon
= inf_status
->stop_soon
;
5112 bpstat_clear (&tp
->stop_bpstat
);
5113 tp
->stop_bpstat
= inf_status
->stop_bpstat
;
5114 inf_status
->stop_bpstat
= NULL
;
5115 tp
->proceed_to_finish
= inf_status
->proceed_to_finish
;
5116 tp
->in_infcall
= inf_status
->in_infcall
;
5118 if (target_has_stack
)
5120 /* The point of catch_errors is that if the stack is clobbered,
5121 walking the stack might encounter a garbage pointer and
5122 error() trying to dereference it. */
5124 (restore_selected_frame
, &inf_status
->selected_frame_id
,
5125 "Unable to restore previously selected frame:\n",
5126 RETURN_MASK_ERROR
) == 0)
5127 /* Error in restoring the selected frame. Select the innermost
5129 select_frame (get_current_frame ());
5136 do_restore_inferior_status_cleanup (void *sts
)
5138 restore_inferior_status (sts
);
5142 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
5144 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
5148 discard_inferior_status (struct inferior_status
*inf_status
)
5150 /* See save_inferior_status for info on stop_bpstat. */
5151 bpstat_clear (&inf_status
->stop_bpstat
);
5156 inferior_has_forked (ptid_t pid
, ptid_t
*child_pid
)
5158 struct target_waitstatus last
;
5161 get_last_target_status (&last_ptid
, &last
);
5163 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
5166 if (!ptid_equal (last_ptid
, pid
))
5169 *child_pid
= last
.value
.related_pid
;
5174 inferior_has_vforked (ptid_t pid
, ptid_t
*child_pid
)
5176 struct target_waitstatus last
;
5179 get_last_target_status (&last_ptid
, &last
);
5181 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
5184 if (!ptid_equal (last_ptid
, pid
))
5187 *child_pid
= last
.value
.related_pid
;
5192 inferior_has_execd (ptid_t pid
, char **execd_pathname
)
5194 struct target_waitstatus last
;
5197 get_last_target_status (&last_ptid
, &last
);
5199 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
5202 if (!ptid_equal (last_ptid
, pid
))
5205 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
5209 /* Oft used ptids */
5211 ptid_t minus_one_ptid
;
5213 /* Create a ptid given the necessary PID, LWP, and TID components. */
5216 ptid_build (int pid
, long lwp
, long tid
)
5226 /* Create a ptid from just a pid. */
5229 pid_to_ptid (int pid
)
5231 return ptid_build (pid
, 0, 0);
5234 /* Fetch the pid (process id) component from a ptid. */
5237 ptid_get_pid (ptid_t ptid
)
5242 /* Fetch the lwp (lightweight process) component from a ptid. */
5245 ptid_get_lwp (ptid_t ptid
)
5250 /* Fetch the tid (thread id) component from a ptid. */
5253 ptid_get_tid (ptid_t ptid
)
5258 /* ptid_equal() is used to test equality of two ptids. */
5261 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
5263 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
5264 && ptid1
.tid
== ptid2
.tid
);
5267 /* Returns true if PTID represents a process. */
5270 ptid_is_pid (ptid_t ptid
)
5272 if (ptid_equal (minus_one_ptid
, ptid
))
5274 if (ptid_equal (null_ptid
, ptid
))
5277 return (ptid_get_lwp (ptid
) == 0 && ptid_get_tid (ptid
) == 0);
5280 /* restore_inferior_ptid() will be used by the cleanup machinery
5281 to restore the inferior_ptid value saved in a call to
5282 save_inferior_ptid(). */
5285 restore_inferior_ptid (void *arg
)
5287 ptid_t
*saved_ptid_ptr
= arg
;
5288 inferior_ptid
= *saved_ptid_ptr
;
5292 /* Save the value of inferior_ptid so that it may be restored by a
5293 later call to do_cleanups(). Returns the struct cleanup pointer
5294 needed for later doing the cleanup. */
5297 save_inferior_ptid (void)
5299 ptid_t
*saved_ptid_ptr
;
5301 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
5302 *saved_ptid_ptr
= inferior_ptid
;
5303 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
5307 /* User interface for reverse debugging:
5308 Set exec-direction / show exec-direction commands
5309 (returns error unless target implements to_set_exec_direction method). */
5311 enum exec_direction_kind execution_direction
= EXEC_FORWARD
;
5312 static const char exec_forward
[] = "forward";
5313 static const char exec_reverse
[] = "reverse";
5314 static const char *exec_direction
= exec_forward
;
5315 static const char *exec_direction_names
[] = {
5322 set_exec_direction_func (char *args
, int from_tty
,
5323 struct cmd_list_element
*cmd
)
5325 if (target_can_execute_reverse
)
5327 if (!strcmp (exec_direction
, exec_forward
))
5328 execution_direction
= EXEC_FORWARD
;
5329 else if (!strcmp (exec_direction
, exec_reverse
))
5330 execution_direction
= EXEC_REVERSE
;
5335 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
5336 struct cmd_list_element
*cmd
, const char *value
)
5338 switch (execution_direction
) {
5340 fprintf_filtered (out
, _("Forward.\n"));
5343 fprintf_filtered (out
, _("Reverse.\n"));
5347 fprintf_filtered (out
,
5348 _("Forward (target `%s' does not support exec-direction).\n"),
5354 /* User interface for non-stop mode. */
5357 static int non_stop_1
= 0;
5360 set_non_stop (char *args
, int from_tty
,
5361 struct cmd_list_element
*c
)
5363 if (target_has_execution
)
5365 non_stop_1
= non_stop
;
5366 error (_("Cannot change this setting while the inferior is running."));
5369 non_stop
= non_stop_1
;
5373 show_non_stop (struct ui_file
*file
, int from_tty
,
5374 struct cmd_list_element
*c
, const char *value
)
5376 fprintf_filtered (file
,
5377 _("Controlling the inferior in non-stop mode is %s.\n"),
5383 _initialize_infrun (void)
5387 struct cmd_list_element
*c
;
5389 add_info ("signals", signals_info
, _("\
5390 What debugger does when program gets various signals.\n\
5391 Specify a signal as argument to print info on that signal only."));
5392 add_info_alias ("handle", "signals", 0);
5394 add_com ("handle", class_run
, handle_command
, _("\
5395 Specify how to handle a signal.\n\
5396 Args are signals and actions to apply to those signals.\n\
5397 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5398 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5399 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5400 The special arg \"all\" is recognized to mean all signals except those\n\
5401 used by the debugger, typically SIGTRAP and SIGINT.\n\
5402 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
5403 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
5404 Stop means reenter debugger if this signal happens (implies print).\n\
5405 Print means print a message if this signal happens.\n\
5406 Pass means let program see this signal; otherwise program doesn't know.\n\
5407 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5408 Pass and Stop may be combined."));
5411 add_com ("lz", class_info
, signals_info
, _("\
5412 What debugger does when program gets various signals.\n\
5413 Specify a signal as argument to print info on that signal only."));
5414 add_com ("z", class_run
, xdb_handle_command
, _("\
5415 Specify how to handle a signal.\n\
5416 Args are signals and actions to apply to those signals.\n\
5417 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5418 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5419 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5420 The special arg \"all\" is recognized to mean all signals except those\n\
5421 used by the debugger, typically SIGTRAP and SIGINT.\n\
5422 Recognized actions include \"s\" (toggles between stop and nostop), \n\
5423 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
5424 nopass), \"Q\" (noprint)\n\
5425 Stop means reenter debugger if this signal happens (implies print).\n\
5426 Print means print a message if this signal happens.\n\
5427 Pass means let program see this signal; otherwise program doesn't know.\n\
5428 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5429 Pass and Stop may be combined."));
5433 stop_command
= add_cmd ("stop", class_obscure
,
5434 not_just_help_class_command
, _("\
5435 There is no `stop' command, but you can set a hook on `stop'.\n\
5436 This allows you to set a list of commands to be run each time execution\n\
5437 of the program stops."), &cmdlist
);
5439 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
5440 Set inferior debugging."), _("\
5441 Show inferior debugging."), _("\
5442 When non-zero, inferior specific debugging is enabled."),
5445 &setdebuglist
, &showdebuglist
);
5447 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
5448 Set displaced stepping debugging."), _("\
5449 Show displaced stepping debugging."), _("\
5450 When non-zero, displaced stepping specific debugging is enabled."),
5452 show_debug_displaced
,
5453 &setdebuglist
, &showdebuglist
);
5455 add_setshow_boolean_cmd ("non-stop", no_class
,
5457 Set whether gdb controls the inferior in non-stop mode."), _("\
5458 Show whether gdb controls the inferior in non-stop mode."), _("\
5459 When debugging a multi-threaded program and this setting is\n\
5460 off (the default, also called all-stop mode), when one thread stops\n\
5461 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
5462 all other threads in the program while you interact with the thread of\n\
5463 interest. When you continue or step a thread, you can allow the other\n\
5464 threads to run, or have them remain stopped, but while you inspect any\n\
5465 thread's state, all threads stop.\n\
5467 In non-stop mode, when one thread stops, other threads can continue\n\
5468 to run freely. You'll be able to step each thread independently,\n\
5469 leave it stopped or free to run as needed."),
5475 numsigs
= (int) TARGET_SIGNAL_LAST
;
5476 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
5477 signal_print
= (unsigned char *)
5478 xmalloc (sizeof (signal_print
[0]) * numsigs
);
5479 signal_program
= (unsigned char *)
5480 xmalloc (sizeof (signal_program
[0]) * numsigs
);
5481 for (i
= 0; i
< numsigs
; i
++)
5484 signal_print
[i
] = 1;
5485 signal_program
[i
] = 1;
5488 /* Signals caused by debugger's own actions
5489 should not be given to the program afterwards. */
5490 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
5491 signal_program
[TARGET_SIGNAL_INT
] = 0;
5493 /* Signals that are not errors should not normally enter the debugger. */
5494 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
5495 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
5496 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
5497 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
5498 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
5499 signal_print
[TARGET_SIGNAL_PROF
] = 0;
5500 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
5501 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
5502 signal_stop
[TARGET_SIGNAL_IO
] = 0;
5503 signal_print
[TARGET_SIGNAL_IO
] = 0;
5504 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
5505 signal_print
[TARGET_SIGNAL_POLL
] = 0;
5506 signal_stop
[TARGET_SIGNAL_URG
] = 0;
5507 signal_print
[TARGET_SIGNAL_URG
] = 0;
5508 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
5509 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
5511 /* These signals are used internally by user-level thread
5512 implementations. (See signal(5) on Solaris.) Like the above
5513 signals, a healthy program receives and handles them as part of
5514 its normal operation. */
5515 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
5516 signal_print
[TARGET_SIGNAL_LWP
] = 0;
5517 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
5518 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
5519 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
5520 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
5522 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
5523 &stop_on_solib_events
, _("\
5524 Set stopping for shared library events."), _("\
5525 Show stopping for shared library events."), _("\
5526 If nonzero, gdb will give control to the user when the dynamic linker\n\
5527 notifies gdb of shared library events. The most common event of interest\n\
5528 to the user would be loading/unloading of a new library."),
5530 show_stop_on_solib_events
,
5531 &setlist
, &showlist
);
5533 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
5534 follow_fork_mode_kind_names
,
5535 &follow_fork_mode_string
, _("\
5536 Set debugger response to a program call of fork or vfork."), _("\
5537 Show debugger response to a program call of fork or vfork."), _("\
5538 A fork or vfork creates a new process. follow-fork-mode can be:\n\
5539 parent - the original process is debugged after a fork\n\
5540 child - the new process is debugged after a fork\n\
5541 The unfollowed process will continue to run.\n\
5542 By default, the debugger will follow the parent process."),
5544 show_follow_fork_mode_string
,
5545 &setlist
, &showlist
);
5547 add_setshow_enum_cmd ("scheduler-locking", class_run
,
5548 scheduler_enums
, &scheduler_mode
, _("\
5549 Set mode for locking scheduler during execution."), _("\
5550 Show mode for locking scheduler during execution."), _("\
5551 off == no locking (threads may preempt at any time)\n\
5552 on == full locking (no thread except the current thread may run)\n\
5553 step == scheduler locked during every single-step operation.\n\
5554 In this mode, no other thread may run during a step command.\n\
5555 Other threads may run while stepping over a function call ('next')."),
5556 set_schedlock_func
, /* traps on target vector */
5557 show_scheduler_mode
,
5558 &setlist
, &showlist
);
5560 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
5561 Set mode of the step operation."), _("\
5562 Show mode of the step operation."), _("\
5563 When set, doing a step over a function without debug line information\n\
5564 will stop at the first instruction of that function. Otherwise, the\n\
5565 function is skipped and the step command stops at a different source line."),
5567 show_step_stop_if_no_debug
,
5568 &setlist
, &showlist
);
5570 add_setshow_enum_cmd ("displaced-stepping", class_run
,
5571 can_use_displaced_stepping_enum
,
5572 &can_use_displaced_stepping
, _("\
5573 Set debugger's willingness to use displaced stepping."), _("\
5574 Show debugger's willingness to use displaced stepping."), _("\
5575 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
5576 supported by the target architecture. If off, gdb will not use displaced\n\
5577 stepping to step over breakpoints, even if such is supported by the target\n\
5578 architecture. If auto (which is the default), gdb will use displaced stepping\n\
5579 if the target architecture supports it and non-stop mode is active, but will not\n\
5580 use it in all-stop mode (see help set non-stop)."),
5582 show_can_use_displaced_stepping
,
5583 &setlist
, &showlist
);
5585 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
5586 &exec_direction
, _("Set direction of execution.\n\
5587 Options are 'forward' or 'reverse'."),
5588 _("Show direction of execution (forward/reverse)."),
5589 _("Tells gdb whether to execute forward or backward."),
5590 set_exec_direction_func
, show_exec_direction_func
,
5591 &setlist
, &showlist
);
5593 /* ptid initializations */
5594 null_ptid
= ptid_build (0, 0, 0);
5595 minus_one_ptid
= ptid_build (-1, 0, 0);
5596 inferior_ptid
= null_ptid
;
5597 target_last_wait_ptid
= minus_one_ptid
;
5598 displaced_step_ptid
= null_ptid
;
5600 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
5601 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
5602 observer_attach_thread_exit (infrun_thread_thread_exit
);
5604 /* Explicitly create without lookup, since that tries to create a
5605 value with a void typed value, and when we get here, gdbarch
5606 isn't initialized yet. At this point, we're quite sure there
5607 isn't another convenience variable of the same name. */
5608 create_internalvar_type_lazy ("_siginfo", siginfo_make_value
);