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 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 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
26 #include "gdb_string.h"
31 #include "exceptions.h"
32 #include "breakpoint.h"
36 #include "cli/cli-script.h"
38 #include "gdbthread.h"
51 #include "gdb_assert.h"
52 #include "mi/mi-common.h"
54 /* Prototypes for local functions */
56 static void signals_info (char *, int);
58 static void handle_command (char *, int);
60 static void sig_print_info (enum target_signal);
62 static void sig_print_header (void);
64 static void resume_cleanups (void *);
66 static int hook_stop_stub (void *);
68 static int restore_selected_frame (void *);
70 static void build_infrun (void);
72 static int follow_fork (void);
74 static void set_schedlock_func (char *args, int from_tty,
75 struct cmd_list_element *c);
77 struct execution_control_state;
79 static int currently_stepping (struct execution_control_state *ecs);
81 static void xdb_handle_command (char *args, int from_tty);
83 static int prepare_to_proceed (void);
85 void _initialize_infrun (void);
87 int inferior_ignoring_startup_exec_events = 0;
88 int inferior_ignoring_leading_exec_events = 0;
90 /* When set, stop the 'step' command if we enter a function which has
91 no line number information. The normal behavior is that we step
92 over such function. */
93 int step_stop_if_no_debug = 0;
95 show_step_stop_if_no_debug (struct ui_file *file, int from_tty,
96 struct cmd_list_element *c, const char *value)
98 fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value);
101 /* In asynchronous mode, but simulating synchronous execution. */
103 int sync_execution = 0;
105 /* wait_for_inferior and normal_stop use this to notify the user
106 when the inferior stopped in a different thread than it had been
109 static ptid_t previous_inferior_ptid;
111 /* This is true for configurations that may follow through execl() and
112 similar functions. At present this is only true for HP-UX native. */
114 #ifndef MAY_FOLLOW_EXEC
115 #define MAY_FOLLOW_EXEC (0)
118 static int may_follow_exec = MAY_FOLLOW_EXEC;
120 static int debug_infrun = 0;
122 show_debug_infrun (struct ui_file *file, int from_tty,
123 struct cmd_list_element *c, const char *value)
125 fprintf_filtered (file, _("Inferior debugging is %s.\n"), value);
128 /* If the program uses ELF-style shared libraries, then calls to
129 functions in shared libraries go through stubs, which live in a
130 table called the PLT (Procedure Linkage Table). The first time the
131 function is called, the stub sends control to the dynamic linker,
132 which looks up the function's real address, patches the stub so
133 that future calls will go directly to the function, and then passes
134 control to the function.
136 If we are stepping at the source level, we don't want to see any of
137 this --- we just want to skip over the stub and the dynamic linker.
138 The simple approach is to single-step until control leaves the
141 However, on some systems (e.g., Red Hat's 5.2 distribution) the
142 dynamic linker calls functions in the shared C library, so you
143 can't tell from the PC alone whether the dynamic linker is still
144 running. In this case, we use a step-resume breakpoint to get us
145 past the dynamic linker, as if we were using "next" to step over a
148 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
149 linker code or not. Normally, this means we single-step. However,
150 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
151 address where we can place a step-resume breakpoint to get past the
152 linker's symbol resolution function.
154 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
155 pretty portable way, by comparing the PC against the address ranges
156 of the dynamic linker's sections.
158 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
159 it depends on internal details of the dynamic linker. It's usually
160 not too hard to figure out where to put a breakpoint, but it
161 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
162 sanity checking. If it can't figure things out, returning zero and
163 getting the (possibly confusing) stepping behavior is better than
164 signalling an error, which will obscure the change in the
167 /* This function returns TRUE if pc is the address of an instruction
168 that lies within the dynamic linker (such as the event hook, or the
171 This function must be used only when a dynamic linker event has
172 been caught, and the inferior is being stepped out of the hook, or
173 undefined results are guaranteed. */
175 #ifndef SOLIB_IN_DYNAMIC_LINKER
176 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
179 /* We can't step off a permanent breakpoint in the ordinary way, because we
180 can't remove it. Instead, we have to advance the PC to the next
181 instruction. This macro should expand to a pointer to a function that
182 does that, or zero if we have no such function. If we don't have a
183 definition for it, we have to report an error. */
184 #ifndef SKIP_PERMANENT_BREAKPOINT
185 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
187 default_skip_permanent_breakpoint (void)
190 The program is stopped at a permanent breakpoint, but GDB does not know\n\
191 how to step past a permanent breakpoint on this architecture. Try using\n\
192 a command like `return' or `jump' to continue execution."));
197 /* Convert the #defines into values. This is temporary until wfi control
198 flow is completely sorted out. */
200 #ifndef HAVE_STEPPABLE_WATCHPOINT
201 #define HAVE_STEPPABLE_WATCHPOINT 0
203 #undef HAVE_STEPPABLE_WATCHPOINT
204 #define HAVE_STEPPABLE_WATCHPOINT 1
207 #ifndef CANNOT_STEP_HW_WATCHPOINTS
208 #define CANNOT_STEP_HW_WATCHPOINTS 0
210 #undef CANNOT_STEP_HW_WATCHPOINTS
211 #define CANNOT_STEP_HW_WATCHPOINTS 1
214 /* Tables of how to react to signals; the user sets them. */
216 static unsigned char *signal_stop;
217 static unsigned char *signal_print;
218 static unsigned char *signal_program;
220 #define SET_SIGS(nsigs,sigs,flags) \
222 int signum = (nsigs); \
223 while (signum-- > 0) \
224 if ((sigs)[signum]) \
225 (flags)[signum] = 1; \
228 #define UNSET_SIGS(nsigs,sigs,flags) \
230 int signum = (nsigs); \
231 while (signum-- > 0) \
232 if ((sigs)[signum]) \
233 (flags)[signum] = 0; \
236 /* Value to pass to target_resume() to cause all threads to resume */
238 #define RESUME_ALL (pid_to_ptid (-1))
240 /* Command list pointer for the "stop" placeholder. */
242 static struct cmd_list_element *stop_command;
244 /* Nonzero if breakpoints are now inserted in the inferior. */
246 static int breakpoints_inserted;
248 /* Function inferior was in as of last step command. */
250 static struct symbol *step_start_function;
252 /* Nonzero if we are expecting a trace trap and should proceed from it. */
254 static int trap_expected;
256 /* Nonzero if we want to give control to the user when we're notified
257 of shared library events by the dynamic linker. */
258 static int stop_on_solib_events;
260 show_stop_on_solib_events (struct ui_file *file, int from_tty,
261 struct cmd_list_element *c, const char *value)
263 fprintf_filtered (file, _("Stopping for shared library events is %s.\n"),
267 /* Nonzero means expecting a trace trap
268 and should stop the inferior and return silently when it happens. */
272 /* Nonzero means expecting a trap and caller will handle it themselves.
273 It is used after attach, due to attaching to a process;
274 when running in the shell before the child program has been exec'd;
275 and when running some kinds of remote stuff (FIXME?). */
277 enum stop_kind stop_soon;
279 /* Nonzero if proceed is being used for a "finish" command or a similar
280 situation when stop_registers should be saved. */
282 int proceed_to_finish;
284 /* Save register contents here when about to pop a stack dummy frame,
285 if-and-only-if proceed_to_finish is set.
286 Thus this contains the return value from the called function (assuming
287 values are returned in a register). */
289 struct regcache *stop_registers;
291 /* Nonzero if program stopped due to error trying to insert breakpoints. */
293 static int breakpoints_failed;
295 /* Nonzero after stop if current stack frame should be printed. */
297 static int stop_print_frame;
299 static struct breakpoint *step_resume_breakpoint = NULL;
301 /* This is a cached copy of the pid/waitstatus of the last event
302 returned by target_wait()/deprecated_target_wait_hook(). This
303 information is returned by get_last_target_status(). */
304 static ptid_t target_last_wait_ptid;
305 static struct target_waitstatus target_last_waitstatus;
307 /* This is used to remember when a fork, vfork or exec event
308 was caught by a catchpoint, and thus the event is to be
309 followed at the next resume of the inferior, and not
313 enum target_waitkind kind;
320 char *execd_pathname;
324 static const char follow_fork_mode_child[] = "child";
325 static const char follow_fork_mode_parent[] = "parent";
327 static const char *follow_fork_mode_kind_names[] = {
328 follow_fork_mode_child,
329 follow_fork_mode_parent,
333 static const char *follow_fork_mode_string = follow_fork_mode_parent;
335 show_follow_fork_mode_string (struct ui_file *file, int from_tty,
336 struct cmd_list_element *c, const char *value)
338 fprintf_filtered (file, _("\
339 Debugger response to a program call of fork or vfork is \"%s\".\n"),
347 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
349 return target_follow_fork (follow_child);
353 follow_inferior_reset_breakpoints (void)
355 /* Was there a step_resume breakpoint? (There was if the user
356 did a "next" at the fork() call.) If so, explicitly reset its
359 step_resumes are a form of bp that are made to be per-thread.
360 Since we created the step_resume bp when the parent process
361 was being debugged, and now are switching to the child process,
362 from the breakpoint package's viewpoint, that's a switch of
363 "threads". We must update the bp's notion of which thread
364 it is for, or it'll be ignored when it triggers. */
366 if (step_resume_breakpoint)
367 breakpoint_re_set_thread (step_resume_breakpoint);
369 /* Reinsert all breakpoints in the child. The user may have set
370 breakpoints after catching the fork, in which case those
371 were never set in the child, but only in the parent. This makes
372 sure the inserted breakpoints match the breakpoint list. */
374 breakpoint_re_set ();
375 insert_breakpoints ();
378 /* EXECD_PATHNAME is assumed to be non-NULL. */
381 follow_exec (int pid, char *execd_pathname)
384 struct target_ops *tgt;
386 if (!may_follow_exec)
389 /* This is an exec event that we actually wish to pay attention to.
390 Refresh our symbol table to the newly exec'd program, remove any
393 If there are breakpoints, they aren't really inserted now,
394 since the exec() transformed our inferior into a fresh set
397 We want to preserve symbolic breakpoints on the list, since
398 we have hopes that they can be reset after the new a.out's
399 symbol table is read.
401 However, any "raw" breakpoints must be removed from the list
402 (e.g., the solib bp's), since their address is probably invalid
405 And, we DON'T want to call delete_breakpoints() here, since
406 that may write the bp's "shadow contents" (the instruction
407 value that was overwritten witha TRAP instruction). Since
408 we now have a new a.out, those shadow contents aren't valid. */
409 update_breakpoints_after_exec ();
411 /* If there was one, it's gone now. We cannot truly step-to-next
412 statement through an exec(). */
413 step_resume_breakpoint = NULL;
414 step_range_start = 0;
417 /* What is this a.out's name? */
418 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname);
420 /* We've followed the inferior through an exec. Therefore, the
421 inferior has essentially been killed & reborn. */
423 /* First collect the run target in effect. */
424 tgt = find_run_target ();
425 /* If we can't find one, things are in a very strange state... */
427 error (_("Could find run target to save before following exec"));
429 gdb_flush (gdb_stdout);
430 target_mourn_inferior ();
431 inferior_ptid = pid_to_ptid (saved_pid);
432 /* Because mourn_inferior resets inferior_ptid. */
435 /* That a.out is now the one to use. */
436 exec_file_attach (execd_pathname, 0);
438 /* And also is where symbols can be found. */
439 symbol_file_add_main (execd_pathname, 0);
441 /* Reset the shared library package. This ensures that we get
442 a shlib event when the child reaches "_start", at which point
443 the dld will have had a chance to initialize the child. */
444 #if defined(SOLIB_RESTART)
447 #ifdef SOLIB_CREATE_INFERIOR_HOOK
448 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
450 solib_create_inferior_hook ();
453 /* Reinsert all breakpoints. (Those which were symbolic have
454 been reset to the proper address in the new a.out, thanks
455 to symbol_file_command...) */
456 insert_breakpoints ();
458 /* The next resume of this inferior should bring it to the shlib
459 startup breakpoints. (If the user had also set bp's on
460 "main" from the old (parent) process, then they'll auto-
461 matically get reset there in the new process.) */
464 /* Non-zero if we just simulating a single-step. This is needed
465 because we cannot remove the breakpoints in the inferior process
466 until after the `wait' in `wait_for_inferior'. */
467 static int singlestep_breakpoints_inserted_p = 0;
469 /* The thread we inserted single-step breakpoints for. */
470 static ptid_t singlestep_ptid;
472 /* PC when we started this single-step. */
473 static CORE_ADDR singlestep_pc;
475 /* If another thread hit the singlestep breakpoint, we save the original
476 thread here so that we can resume single-stepping it later. */
477 static ptid_t saved_singlestep_ptid;
478 static int stepping_past_singlestep_breakpoint;
481 /* Things to clean up if we QUIT out of resume (). */
483 resume_cleanups (void *ignore)
488 static const char schedlock_off[] = "off";
489 static const char schedlock_on[] = "on";
490 static const char schedlock_step[] = "step";
491 static const char *scheduler_enums[] = {
497 static const char *scheduler_mode = schedlock_off;
499 show_scheduler_mode (struct ui_file *file, int from_tty,
500 struct cmd_list_element *c, const char *value)
502 fprintf_filtered (file, _("\
503 Mode for locking scheduler during execution is \"%s\".\n"),
508 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
510 if (!target_can_lock_scheduler)
512 scheduler_mode = schedlock_off;
513 error (_("Target '%s' cannot support this command."), target_shortname);
518 /* Resume the inferior, but allow a QUIT. This is useful if the user
519 wants to interrupt some lengthy single-stepping operation
520 (for child processes, the SIGINT goes to the inferior, and so
521 we get a SIGINT random_signal, but for remote debugging and perhaps
522 other targets, that's not true).
524 STEP nonzero if we should step (zero to continue instead).
525 SIG is the signal to give the inferior (zero for none). */
527 resume (int step, enum target_signal sig)
529 int should_resume = 1;
530 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
534 fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n",
537 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
540 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
541 over an instruction that causes a page fault without triggering
542 a hardware watchpoint. The kernel properly notices that it shouldn't
543 stop, because the hardware watchpoint is not triggered, but it forgets
544 the step request and continues the program normally.
545 Work around the problem by removing hardware watchpoints if a step is
546 requested, GDB will check for a hardware watchpoint trigger after the
548 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
549 remove_hw_watchpoints ();
552 /* Normally, by the time we reach `resume', the breakpoints are either
553 removed or inserted, as appropriate. The exception is if we're sitting
554 at a permanent breakpoint; we need to step over it, but permanent
555 breakpoints can't be removed. So we have to test for it here. */
556 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
557 SKIP_PERMANENT_BREAKPOINT ();
559 if (SOFTWARE_SINGLE_STEP_P () && step)
561 /* Do it the hard way, w/temp breakpoints */
562 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
563 /* ...and don't ask hardware to do it. */
565 /* and do not pull these breakpoints until after a `wait' in
566 `wait_for_inferior' */
567 singlestep_breakpoints_inserted_p = 1;
568 singlestep_ptid = inferior_ptid;
569 singlestep_pc = read_pc ();
572 /* If there were any forks/vforks/execs that were caught and are
573 now to be followed, then do so. */
574 switch (pending_follow.kind)
576 case TARGET_WAITKIND_FORKED:
577 case TARGET_WAITKIND_VFORKED:
578 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
583 case TARGET_WAITKIND_EXECD:
584 /* follow_exec is called as soon as the exec event is seen. */
585 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
592 /* Install inferior's terminal modes. */
593 target_terminal_inferior ();
599 resume_ptid = RESUME_ALL; /* Default */
601 if ((step || singlestep_breakpoints_inserted_p)
602 && (stepping_past_singlestep_breakpoint
603 || (!breakpoints_inserted && breakpoint_here_p (read_pc ()))))
605 /* Stepping past a breakpoint without inserting breakpoints.
606 Make sure only the current thread gets to step, so that
607 other threads don't sneak past breakpoints while they are
610 resume_ptid = inferior_ptid;
613 if ((scheduler_mode == schedlock_on)
614 || (scheduler_mode == schedlock_step
615 && (step || singlestep_breakpoints_inserted_p)))
617 /* User-settable 'scheduler' mode requires solo thread resume. */
618 resume_ptid = inferior_ptid;
621 if (CANNOT_STEP_BREAKPOINT)
623 /* Most targets can step a breakpoint instruction, thus
624 executing it normally. But if this one cannot, just
625 continue and we will hit it anyway. */
626 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
629 target_resume (resume_ptid, step, sig);
632 discard_cleanups (old_cleanups);
636 /* Clear out all variables saying what to do when inferior is continued.
637 First do this, then set the ones you want, then call `proceed'. */
640 clear_proceed_status (void)
643 step_range_start = 0;
645 step_frame_id = null_frame_id;
646 step_over_calls = STEP_OVER_UNDEBUGGABLE;
648 stop_soon = NO_STOP_QUIETLY;
649 proceed_to_finish = 0;
650 breakpoint_proceeded = 1; /* We're about to proceed... */
652 /* Discard any remaining commands or status from previous stop. */
653 bpstat_clear (&stop_bpstat);
656 /* This should be suitable for any targets that support threads. */
659 prepare_to_proceed (void)
662 struct target_waitstatus wait_status;
664 /* Get the last target status returned by target_wait(). */
665 get_last_target_status (&wait_ptid, &wait_status);
667 /* Make sure we were stopped either at a breakpoint, or because
669 if (wait_status.kind != TARGET_WAITKIND_STOPPED
670 || (wait_status.value.sig != TARGET_SIGNAL_TRAP
671 && wait_status.value.sig != TARGET_SIGNAL_INT))
676 if (!ptid_equal (wait_ptid, minus_one_ptid)
677 && !ptid_equal (inferior_ptid, wait_ptid))
679 /* Switched over from WAIT_PID. */
680 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
682 if (wait_pc != read_pc ())
684 /* Switch back to WAIT_PID thread. */
685 inferior_ptid = wait_ptid;
687 /* FIXME: This stuff came from switch_to_thread() in
688 thread.c (which should probably be a public function). */
689 reinit_frame_cache ();
690 registers_changed ();
694 /* We return 1 to indicate that there is a breakpoint here,
695 so we need to step over it before continuing to avoid
696 hitting it straight away. */
697 if (breakpoint_here_p (wait_pc))
705 /* Record the pc of the program the last time it stopped. This is
706 just used internally by wait_for_inferior, but need to be preserved
707 over calls to it and cleared when the inferior is started. */
708 static CORE_ADDR prev_pc;
710 /* Basic routine for continuing the program in various fashions.
712 ADDR is the address to resume at, or -1 for resume where stopped.
713 SIGGNAL is the signal to give it, or 0 for none,
714 or -1 for act according to how it stopped.
715 STEP is nonzero if should trap after one instruction.
716 -1 means return after that and print nothing.
717 You should probably set various step_... variables
718 before calling here, if you are stepping.
720 You should call clear_proceed_status before calling proceed. */
723 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
728 step_start_function = find_pc_function (read_pc ());
732 if (addr == (CORE_ADDR) -1)
734 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
735 /* There is a breakpoint at the address we will resume at,
736 step one instruction before inserting breakpoints so that
737 we do not stop right away (and report a second hit at this
740 else if (gdbarch_single_step_through_delay_p (current_gdbarch)
741 && gdbarch_single_step_through_delay (current_gdbarch,
742 get_current_frame ()))
743 /* We stepped onto an instruction that needs to be stepped
744 again before re-inserting the breakpoint, do so. */
753 fprintf_unfiltered (gdb_stdlog,
754 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
755 paddr_nz (addr), siggnal, step);
757 /* In a multi-threaded task we may select another thread
758 and then continue or step.
760 But if the old thread was stopped at a breakpoint, it
761 will immediately cause another breakpoint stop without
762 any execution (i.e. it will report a breakpoint hit
763 incorrectly). So we must step over it first.
765 prepare_to_proceed checks the current thread against the thread
766 that reported the most recent event. If a step-over is required
767 it returns TRUE and sets the current thread to the old thread. */
768 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
772 /* We will get a trace trap after one instruction.
773 Continue it automatically and insert breakpoints then. */
777 insert_breakpoints ();
778 /* If we get here there was no call to error() in
779 insert breakpoints -- so they were inserted. */
780 breakpoints_inserted = 1;
783 if (siggnal != TARGET_SIGNAL_DEFAULT)
784 stop_signal = siggnal;
785 /* If this signal should not be seen by program,
786 give it zero. Used for debugging signals. */
787 else if (!signal_program[stop_signal])
788 stop_signal = TARGET_SIGNAL_0;
790 annotate_starting ();
792 /* Make sure that output from GDB appears before output from the
794 gdb_flush (gdb_stdout);
796 /* Refresh prev_pc value just prior to resuming. This used to be
797 done in stop_stepping, however, setting prev_pc there did not handle
798 scenarios such as inferior function calls or returning from
799 a function via the return command. In those cases, the prev_pc
800 value was not set properly for subsequent commands. The prev_pc value
801 is used to initialize the starting line number in the ecs. With an
802 invalid value, the gdb next command ends up stopping at the position
803 represented by the next line table entry past our start position.
804 On platforms that generate one line table entry per line, this
805 is not a problem. However, on the ia64, the compiler generates
806 extraneous line table entries that do not increase the line number.
807 When we issue the gdb next command on the ia64 after an inferior call
808 or a return command, we often end up a few instructions forward, still
809 within the original line we started.
811 An attempt was made to have init_execution_control_state () refresh
812 the prev_pc value before calculating the line number. This approach
813 did not work because on platforms that use ptrace, the pc register
814 cannot be read unless the inferior is stopped. At that point, we
815 are not guaranteed the inferior is stopped and so the read_pc ()
816 call can fail. Setting the prev_pc value here ensures the value is
817 updated correctly when the inferior is stopped. */
818 prev_pc = read_pc ();
820 /* Resume inferior. */
821 resume (oneproc || step || bpstat_should_step (), stop_signal);
823 /* Wait for it to stop (if not standalone)
824 and in any case decode why it stopped, and act accordingly. */
825 /* Do this only if we are not using the event loop, or if the target
826 does not support asynchronous execution. */
827 if (!target_can_async_p ())
829 wait_for_inferior ();
835 /* Start remote-debugging of a machine over a serial link. */
838 start_remote (int from_tty)
841 init_wait_for_inferior ();
842 stop_soon = STOP_QUIETLY;
845 /* Always go on waiting for the target, regardless of the mode. */
846 /* FIXME: cagney/1999-09-23: At present it isn't possible to
847 indicate to wait_for_inferior that a target should timeout if
848 nothing is returned (instead of just blocking). Because of this,
849 targets expecting an immediate response need to, internally, set
850 things up so that the target_wait() is forced to eventually
852 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
853 differentiate to its caller what the state of the target is after
854 the initial open has been performed. Here we're assuming that
855 the target has stopped. It should be possible to eventually have
856 target_open() return to the caller an indication that the target
857 is currently running and GDB state should be set to the same as
859 wait_for_inferior ();
861 /* Now that the inferior has stopped, do any bookkeeping like
862 loading shared libraries. We want to do this before normal_stop,
863 so that the displayed frame is up to date. */
864 post_create_inferior (¤t_target, from_tty);
869 /* Initialize static vars when a new inferior begins. */
872 init_wait_for_inferior (void)
874 /* These are meaningless until the first time through wait_for_inferior. */
877 breakpoints_inserted = 0;
878 breakpoint_init_inferior (inf_starting);
880 /* Don't confuse first call to proceed(). */
881 stop_signal = TARGET_SIGNAL_0;
883 /* The first resume is not following a fork/vfork/exec. */
884 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
886 clear_proceed_status ();
888 stepping_past_singlestep_breakpoint = 0;
891 /* This enum encodes possible reasons for doing a target_wait, so that
892 wfi can call target_wait in one place. (Ultimately the call will be
893 moved out of the infinite loop entirely.) */
897 infwait_normal_state,
898 infwait_thread_hop_state,
899 infwait_nonstep_watch_state
902 /* Why did the inferior stop? Used to print the appropriate messages
903 to the interface from within handle_inferior_event(). */
904 enum inferior_stop_reason
906 /* Step, next, nexti, stepi finished. */
908 /* Inferior terminated by signal. */
910 /* Inferior exited. */
912 /* Inferior received signal, and user asked to be notified. */
916 /* This structure contains what used to be local variables in
917 wait_for_inferior. Probably many of them can return to being
918 locals in handle_inferior_event. */
920 struct execution_control_state
922 struct target_waitstatus ws;
923 struct target_waitstatus *wp;
926 CORE_ADDR stop_func_start;
927 CORE_ADDR stop_func_end;
928 char *stop_func_name;
929 struct symtab_and_line sal;
931 struct symtab *current_symtab;
932 int handling_longjmp; /* FIXME */
934 ptid_t saved_inferior_ptid;
935 int step_after_step_resume_breakpoint;
936 int stepping_through_solib_after_catch;
937 bpstat stepping_through_solib_catchpoints;
938 int new_thread_event;
939 struct target_waitstatus tmpstatus;
940 enum infwait_states infwait_state;
945 void init_execution_control_state (struct execution_control_state *ecs);
947 void handle_inferior_event (struct execution_control_state *ecs);
949 static void step_into_function (struct execution_control_state *ecs);
950 static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame);
951 static void insert_step_resume_breakpoint_at_caller (struct frame_info *);
952 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
953 struct frame_id sr_id);
954 static void stop_stepping (struct execution_control_state *ecs);
955 static void prepare_to_wait (struct execution_control_state *ecs);
956 static void keep_going (struct execution_control_state *ecs);
957 static void print_stop_reason (enum inferior_stop_reason stop_reason,
960 /* Wait for control to return from inferior to debugger.
961 If inferior gets a signal, we may decide to start it up again
962 instead of returning. That is why there is a loop in this function.
963 When this function actually returns it means the inferior
964 should be left stopped and GDB should read more commands. */
967 wait_for_inferior (void)
969 struct cleanup *old_cleanups;
970 struct execution_control_state ecss;
971 struct execution_control_state *ecs;
974 fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n");
976 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
977 &step_resume_breakpoint);
979 /* wfi still stays in a loop, so it's OK just to take the address of
980 a local to get the ecs pointer. */
983 /* Fill in with reasonable starting values. */
984 init_execution_control_state (ecs);
986 /* We'll update this if & when we switch to a new thread. */
987 previous_inferior_ptid = inferior_ptid;
989 overlay_cache_invalid = 1;
991 /* We have to invalidate the registers BEFORE calling target_wait
992 because they can be loaded from the target while in target_wait.
993 This makes remote debugging a bit more efficient for those
994 targets that provide critical registers as part of their normal
997 registers_changed ();
1001 if (deprecated_target_wait_hook)
1002 ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
1004 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
1006 /* Now figure out what to do with the result of the result. */
1007 handle_inferior_event (ecs);
1009 if (!ecs->wait_some_more)
1012 do_cleanups (old_cleanups);
1015 /* Asynchronous version of wait_for_inferior. It is called by the
1016 event loop whenever a change of state is detected on the file
1017 descriptor corresponding to the target. It can be called more than
1018 once to complete a single execution command. In such cases we need
1019 to keep the state in a global variable ASYNC_ECSS. If it is the
1020 last time that this function is called for a single execution
1021 command, then report to the user that the inferior has stopped, and
1022 do the necessary cleanups. */
1024 struct execution_control_state async_ecss;
1025 struct execution_control_state *async_ecs;
1028 fetch_inferior_event (void *client_data)
1030 static struct cleanup *old_cleanups;
1032 async_ecs = &async_ecss;
1034 if (!async_ecs->wait_some_more)
1036 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1037 &step_resume_breakpoint);
1039 /* Fill in with reasonable starting values. */
1040 init_execution_control_state (async_ecs);
1042 /* We'll update this if & when we switch to a new thread. */
1043 previous_inferior_ptid = inferior_ptid;
1045 overlay_cache_invalid = 1;
1047 /* We have to invalidate the registers BEFORE calling target_wait
1048 because they can be loaded from the target while in target_wait.
1049 This makes remote debugging a bit more efficient for those
1050 targets that provide critical registers as part of their normal
1051 status mechanism. */
1053 registers_changed ();
1056 if (deprecated_target_wait_hook)
1058 deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1060 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1062 /* Now figure out what to do with the result of the result. */
1063 handle_inferior_event (async_ecs);
1065 if (!async_ecs->wait_some_more)
1067 /* Do only the cleanups that have been added by this
1068 function. Let the continuations for the commands do the rest,
1069 if there are any. */
1070 do_exec_cleanups (old_cleanups);
1072 if (step_multi && stop_step)
1073 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1075 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1079 /* Prepare an execution control state for looping through a
1080 wait_for_inferior-type loop. */
1083 init_execution_control_state (struct execution_control_state *ecs)
1085 ecs->another_trap = 0;
1086 ecs->random_signal = 0;
1087 ecs->step_after_step_resume_breakpoint = 0;
1088 ecs->handling_longjmp = 0; /* FIXME */
1089 ecs->stepping_through_solib_after_catch = 0;
1090 ecs->stepping_through_solib_catchpoints = NULL;
1091 ecs->sal = find_pc_line (prev_pc, 0);
1092 ecs->current_line = ecs->sal.line;
1093 ecs->current_symtab = ecs->sal.symtab;
1094 ecs->infwait_state = infwait_normal_state;
1095 ecs->waiton_ptid = pid_to_ptid (-1);
1096 ecs->wp = &(ecs->ws);
1099 /* Return the cached copy of the last pid/waitstatus returned by
1100 target_wait()/deprecated_target_wait_hook(). The data is actually
1101 cached by handle_inferior_event(), which gets called immediately
1102 after target_wait()/deprecated_target_wait_hook(). */
1105 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1107 *ptidp = target_last_wait_ptid;
1108 *status = target_last_waitstatus;
1112 nullify_last_target_wait_ptid (void)
1114 target_last_wait_ptid = minus_one_ptid;
1117 /* Switch thread contexts, maintaining "infrun state". */
1120 context_switch (struct execution_control_state *ecs)
1122 /* Caution: it may happen that the new thread (or the old one!)
1123 is not in the thread list. In this case we must not attempt
1124 to "switch context", or we run the risk that our context may
1125 be lost. This may happen as a result of the target module
1126 mishandling thread creation. */
1130 fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ",
1131 target_pid_to_str (inferior_ptid));
1132 fprintf_unfiltered (gdb_stdlog, "to %s\n",
1133 target_pid_to_str (ecs->ptid));
1136 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1137 { /* Perform infrun state context switch: */
1138 /* Save infrun state for the old thread. */
1139 save_infrun_state (inferior_ptid, prev_pc,
1140 trap_expected, step_resume_breakpoint,
1142 step_range_end, &step_frame_id,
1143 ecs->handling_longjmp, ecs->another_trap,
1144 ecs->stepping_through_solib_after_catch,
1145 ecs->stepping_through_solib_catchpoints,
1146 ecs->current_line, ecs->current_symtab);
1148 /* Load infrun state for the new thread. */
1149 load_infrun_state (ecs->ptid, &prev_pc,
1150 &trap_expected, &step_resume_breakpoint,
1152 &step_range_end, &step_frame_id,
1153 &ecs->handling_longjmp, &ecs->another_trap,
1154 &ecs->stepping_through_solib_after_catch,
1155 &ecs->stepping_through_solib_catchpoints,
1156 &ecs->current_line, &ecs->current_symtab);
1158 inferior_ptid = ecs->ptid;
1159 reinit_frame_cache ();
1163 adjust_pc_after_break (struct execution_control_state *ecs)
1165 CORE_ADDR breakpoint_pc;
1167 /* If this target does not decrement the PC after breakpoints, then
1168 we have nothing to do. */
1169 if (DECR_PC_AFTER_BREAK == 0)
1172 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1173 we aren't, just return.
1175 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1176 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1177 by software breakpoints should be handled through the normal breakpoint
1180 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1181 different signals (SIGILL or SIGEMT for instance), but it is less
1182 clear where the PC is pointing afterwards. It may not match
1183 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1184 these signals at breakpoints (the code has been in GDB since at least
1185 1992) so I can not guess how to handle them here.
1187 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1188 would have the PC after hitting a watchpoint affected by
1189 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1190 in GDB history, and it seems unlikely to be correct, so
1191 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1193 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1196 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1199 /* Find the location where (if we've hit a breakpoint) the
1200 breakpoint would be. */
1201 breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK;
1203 if (SOFTWARE_SINGLE_STEP_P ())
1205 /* When using software single-step, a SIGTRAP can only indicate
1206 an inserted breakpoint. This actually makes things
1208 if (singlestep_breakpoints_inserted_p)
1209 /* When software single stepping, the instruction at [prev_pc]
1210 is never a breakpoint, but the instruction following
1211 [prev_pc] (in program execution order) always is. Assume
1212 that following instruction was reached and hence a software
1213 breakpoint was hit. */
1214 write_pc_pid (breakpoint_pc, ecs->ptid);
1215 else if (software_breakpoint_inserted_here_p (breakpoint_pc))
1216 /* The inferior was free running (i.e., no single-step
1217 breakpoints inserted) and it hit a software breakpoint. */
1218 write_pc_pid (breakpoint_pc, ecs->ptid);
1222 /* When using hardware single-step, a SIGTRAP is reported for
1223 both a completed single-step and a software breakpoint. Need
1224 to differentiate between the two as the latter needs
1225 adjusting but the former does not.
1227 When the thread to be examined does not match the current thread
1228 context we can't use currently_stepping, so assume no
1229 single-stepping in this case. */
1230 if (ptid_equal (ecs->ptid, inferior_ptid) && currently_stepping (ecs))
1232 if (prev_pc == breakpoint_pc
1233 && software_breakpoint_inserted_here_p (breakpoint_pc))
1234 /* Hardware single-stepped a software breakpoint (as
1235 occures when the inferior is resumed with PC pointing
1236 at not-yet-hit software breakpoint). Since the
1237 breakpoint really is executed, the inferior needs to be
1238 backed up to the breakpoint address. */
1239 write_pc_pid (breakpoint_pc, ecs->ptid);
1243 if (software_breakpoint_inserted_here_p (breakpoint_pc))
1244 /* The inferior was free running (i.e., no hardware
1245 single-step and no possibility of a false SIGTRAP) and
1246 hit a software breakpoint. */
1247 write_pc_pid (breakpoint_pc, ecs->ptid);
1252 /* Given an execution control state that has been freshly filled in
1253 by an event from the inferior, figure out what it means and take
1254 appropriate action. */
1256 int stepped_after_stopped_by_watchpoint;
1259 handle_inferior_event (struct execution_control_state *ecs)
1261 /* NOTE: bje/2005-05-02: If you're looking at this code and thinking
1262 that the variable stepped_after_stopped_by_watchpoint isn't used,
1263 then you're wrong! See remote.c:remote_stopped_data_address. */
1265 int sw_single_step_trap_p = 0;
1266 int stopped_by_watchpoint = -1; /* Mark as unknown. */
1268 /* Cache the last pid/waitstatus. */
1269 target_last_wait_ptid = ecs->ptid;
1270 target_last_waitstatus = *ecs->wp;
1272 adjust_pc_after_break (ecs);
1274 switch (ecs->infwait_state)
1276 case infwait_thread_hop_state:
1278 fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n");
1279 /* Cancel the waiton_ptid. */
1280 ecs->waiton_ptid = pid_to_ptid (-1);
1283 case infwait_normal_state:
1285 fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n");
1286 stepped_after_stopped_by_watchpoint = 0;
1289 case infwait_nonstep_watch_state:
1291 fprintf_unfiltered (gdb_stdlog,
1292 "infrun: infwait_nonstep_watch_state\n");
1293 insert_breakpoints ();
1295 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1296 handle things like signals arriving and other things happening
1297 in combination correctly? */
1298 stepped_after_stopped_by_watchpoint = 1;
1302 internal_error (__FILE__, __LINE__, _("bad switch"));
1304 ecs->infwait_state = infwait_normal_state;
1306 reinit_frame_cache ();
1308 /* If it's a new process, add it to the thread database */
1310 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1311 && !ptid_equal (ecs->ptid, minus_one_ptid)
1312 && !in_thread_list (ecs->ptid));
1314 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1315 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1317 add_thread (ecs->ptid);
1319 ui_out_text (uiout, "[New ");
1320 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1321 ui_out_text (uiout, "]\n");
1324 switch (ecs->ws.kind)
1326 case TARGET_WAITKIND_LOADED:
1328 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n");
1329 /* Ignore gracefully during startup of the inferior, as it
1330 might be the shell which has just loaded some objects,
1331 otherwise add the symbols for the newly loaded objects. */
1333 if (stop_soon == NO_STOP_QUIETLY)
1335 /* Remove breakpoints, SOLIB_ADD might adjust
1336 breakpoint addresses via breakpoint_re_set. */
1337 if (breakpoints_inserted)
1338 remove_breakpoints ();
1340 /* Check for any newly added shared libraries if we're
1341 supposed to be adding them automatically. Switch
1342 terminal for any messages produced by
1343 breakpoint_re_set. */
1344 target_terminal_ours_for_output ();
1345 /* NOTE: cagney/2003-11-25: Make certain that the target
1346 stack's section table is kept up-to-date. Architectures,
1347 (e.g., PPC64), use the section table to perform
1348 operations such as address => section name and hence
1349 require the table to contain all sections (including
1350 those found in shared libraries). */
1351 /* NOTE: cagney/2003-11-25: Pass current_target and not
1352 exec_ops to SOLIB_ADD. This is because current GDB is
1353 only tooled to propagate section_table changes out from
1354 the "current_target" (see target_resize_to_sections), and
1355 not up from the exec stratum. This, of course, isn't
1356 right. "infrun.c" should only interact with the
1357 exec/process stratum, instead relying on the target stack
1358 to propagate relevant changes (stop, section table
1359 changed, ...) up to other layers. */
1360 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1361 target_terminal_inferior ();
1363 /* Reinsert breakpoints and continue. */
1364 if (breakpoints_inserted)
1365 insert_breakpoints ();
1368 resume (0, TARGET_SIGNAL_0);
1369 prepare_to_wait (ecs);
1372 case TARGET_WAITKIND_SPURIOUS:
1374 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1375 resume (0, TARGET_SIGNAL_0);
1376 prepare_to_wait (ecs);
1379 case TARGET_WAITKIND_EXITED:
1381 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n");
1382 target_terminal_ours (); /* Must do this before mourn anyway */
1383 print_stop_reason (EXITED, ecs->ws.value.integer);
1385 /* Record the exit code in the convenience variable $_exitcode, so
1386 that the user can inspect this again later. */
1387 set_internalvar (lookup_internalvar ("_exitcode"),
1388 value_from_longest (builtin_type_int,
1389 (LONGEST) ecs->ws.value.integer));
1390 gdb_flush (gdb_stdout);
1391 target_mourn_inferior ();
1392 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1393 stop_print_frame = 0;
1394 stop_stepping (ecs);
1397 case TARGET_WAITKIND_SIGNALLED:
1399 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1400 stop_print_frame = 0;
1401 stop_signal = ecs->ws.value.sig;
1402 target_terminal_ours (); /* Must do this before mourn anyway */
1404 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1405 reach here unless the inferior is dead. However, for years
1406 target_kill() was called here, which hints that fatal signals aren't
1407 really fatal on some systems. If that's true, then some changes
1409 target_mourn_inferior ();
1411 print_stop_reason (SIGNAL_EXITED, stop_signal);
1412 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1413 stop_stepping (ecs);
1416 /* The following are the only cases in which we keep going;
1417 the above cases end in a continue or goto. */
1418 case TARGET_WAITKIND_FORKED:
1419 case TARGET_WAITKIND_VFORKED:
1421 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n");
1422 stop_signal = TARGET_SIGNAL_TRAP;
1423 pending_follow.kind = ecs->ws.kind;
1425 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1426 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1428 if (!ptid_equal (ecs->ptid, inferior_ptid))
1430 context_switch (ecs);
1431 reinit_frame_cache ();
1434 stop_pc = read_pc ();
1436 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1438 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1440 /* If no catchpoint triggered for this, then keep going. */
1441 if (ecs->random_signal)
1443 stop_signal = TARGET_SIGNAL_0;
1447 goto process_event_stop_test;
1449 case TARGET_WAITKIND_EXECD:
1451 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n");
1452 stop_signal = TARGET_SIGNAL_TRAP;
1454 /* NOTE drow/2002-12-05: This code should be pushed down into the
1455 target_wait function. Until then following vfork on HP/UX 10.20
1456 is probably broken by this. Of course, it's broken anyway. */
1457 /* Is this a target which reports multiple exec events per actual
1458 call to exec()? (HP-UX using ptrace does, for example.) If so,
1459 ignore all but the last one. Just resume the exec'r, and wait
1460 for the next exec event. */
1461 if (inferior_ignoring_leading_exec_events)
1463 inferior_ignoring_leading_exec_events--;
1464 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1465 prepare_to_wait (ecs);
1468 inferior_ignoring_leading_exec_events =
1469 target_reported_exec_events_per_exec_call () - 1;
1471 pending_follow.execd_pathname =
1472 savestring (ecs->ws.value.execd_pathname,
1473 strlen (ecs->ws.value.execd_pathname));
1475 /* This causes the eventpoints and symbol table to be reset. Must
1476 do this now, before trying to determine whether to stop. */
1477 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1478 xfree (pending_follow.execd_pathname);
1480 stop_pc = read_pc_pid (ecs->ptid);
1481 ecs->saved_inferior_ptid = inferior_ptid;
1482 inferior_ptid = ecs->ptid;
1484 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1486 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1487 inferior_ptid = ecs->saved_inferior_ptid;
1489 if (!ptid_equal (ecs->ptid, inferior_ptid))
1491 context_switch (ecs);
1492 reinit_frame_cache ();
1495 /* If no catchpoint triggered for this, then keep going. */
1496 if (ecs->random_signal)
1498 stop_signal = TARGET_SIGNAL_0;
1502 goto process_event_stop_test;
1504 /* Be careful not to try to gather much state about a thread
1505 that's in a syscall. It's frequently a losing proposition. */
1506 case TARGET_WAITKIND_SYSCALL_ENTRY:
1508 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1509 resume (0, TARGET_SIGNAL_0);
1510 prepare_to_wait (ecs);
1513 /* Before examining the threads further, step this thread to
1514 get it entirely out of the syscall. (We get notice of the
1515 event when the thread is just on the verge of exiting a
1516 syscall. Stepping one instruction seems to get it back
1518 case TARGET_WAITKIND_SYSCALL_RETURN:
1520 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1521 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1522 prepare_to_wait (ecs);
1525 case TARGET_WAITKIND_STOPPED:
1527 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n");
1528 stop_signal = ecs->ws.value.sig;
1531 /* We had an event in the inferior, but we are not interested
1532 in handling it at this level. The lower layers have already
1533 done what needs to be done, if anything.
1535 One of the possible circumstances for this is when the
1536 inferior produces output for the console. The inferior has
1537 not stopped, and we are ignoring the event. Another possible
1538 circumstance is any event which the lower level knows will be
1539 reported multiple times without an intervening resume. */
1540 case TARGET_WAITKIND_IGNORE:
1542 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n");
1543 prepare_to_wait (ecs);
1547 /* We may want to consider not doing a resume here in order to give
1548 the user a chance to play with the new thread. It might be good
1549 to make that a user-settable option. */
1551 /* At this point, all threads are stopped (happens automatically in
1552 either the OS or the native code). Therefore we need to continue
1553 all threads in order to make progress. */
1554 if (ecs->new_thread_event)
1556 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1557 prepare_to_wait (ecs);
1561 stop_pc = read_pc_pid (ecs->ptid);
1564 fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc));
1566 if (stepping_past_singlestep_breakpoint)
1568 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1569 && singlestep_breakpoints_inserted_p);
1570 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1571 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1573 stepping_past_singlestep_breakpoint = 0;
1575 /* We've either finished single-stepping past the single-step
1576 breakpoint, or stopped for some other reason. It would be nice if
1577 we could tell, but we can't reliably. */
1578 if (stop_signal == TARGET_SIGNAL_TRAP)
1581 fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n");
1582 /* Pull the single step breakpoints out of the target. */
1583 SOFTWARE_SINGLE_STEP (0, 0);
1584 singlestep_breakpoints_inserted_p = 0;
1586 ecs->random_signal = 0;
1588 ecs->ptid = saved_singlestep_ptid;
1589 context_switch (ecs);
1590 if (deprecated_context_hook)
1591 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1593 resume (1, TARGET_SIGNAL_0);
1594 prepare_to_wait (ecs);
1599 stepping_past_singlestep_breakpoint = 0;
1601 /* See if a thread hit a thread-specific breakpoint that was meant for
1602 another thread. If so, then step that thread past the breakpoint,
1605 if (stop_signal == TARGET_SIGNAL_TRAP)
1607 int thread_hop_needed = 0;
1609 /* Check if a regular breakpoint has been hit before checking
1610 for a potential single step breakpoint. Otherwise, GDB will
1611 not see this breakpoint hit when stepping onto breakpoints. */
1612 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1614 ecs->random_signal = 0;
1615 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1616 thread_hop_needed = 1;
1618 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1620 /* We have not context switched yet, so this should be true
1621 no matter which thread hit the singlestep breakpoint. */
1622 gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid));
1624 fprintf_unfiltered (gdb_stdlog, "infrun: software single step "
1626 target_pid_to_str (ecs->ptid));
1628 ecs->random_signal = 0;
1629 /* The call to in_thread_list is necessary because PTIDs sometimes
1630 change when we go from single-threaded to multi-threaded. If
1631 the singlestep_ptid is still in the list, assume that it is
1632 really different from ecs->ptid. */
1633 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1634 && in_thread_list (singlestep_ptid))
1636 /* If the PC of the thread we were trying to single-step
1637 has changed, discard this event (which we were going
1638 to ignore anyway), and pretend we saw that thread
1639 trap. This prevents us continuously moving the
1640 single-step breakpoint forward, one instruction at a
1641 time. If the PC has changed, then the thread we were
1642 trying to single-step has trapped or been signalled,
1643 but the event has not been reported to GDB yet.
1645 There might be some cases where this loses signal
1646 information, if a signal has arrived at exactly the
1647 same time that the PC changed, but this is the best
1648 we can do with the information available. Perhaps we
1649 should arrange to report all events for all threads
1650 when they stop, or to re-poll the remote looking for
1651 this particular thread (i.e. temporarily enable
1653 if (read_pc_pid (singlestep_ptid) != singlestep_pc)
1656 fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread,"
1657 " but expected thread advanced also\n");
1659 /* The current context still belongs to
1660 singlestep_ptid. Don't swap here, since that's
1661 the context we want to use. Just fudge our
1662 state and continue. */
1663 ecs->ptid = singlestep_ptid;
1664 stop_pc = read_pc_pid (ecs->ptid);
1669 fprintf_unfiltered (gdb_stdlog,
1670 "infrun: unexpected thread\n");
1672 thread_hop_needed = 1;
1673 stepping_past_singlestep_breakpoint = 1;
1674 saved_singlestep_ptid = singlestep_ptid;
1679 if (thread_hop_needed)
1684 fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n");
1686 /* Saw a breakpoint, but it was hit by the wrong thread.
1689 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1691 /* Pull the single step breakpoints out of the target. */
1692 SOFTWARE_SINGLE_STEP (0, 0);
1693 singlestep_breakpoints_inserted_p = 0;
1696 remove_status = remove_breakpoints ();
1697 /* Did we fail to remove breakpoints? If so, try
1698 to set the PC past the bp. (There's at least
1699 one situation in which we can fail to remove
1700 the bp's: On HP-UX's that use ttrace, we can't
1701 change the address space of a vforking child
1702 process until the child exits (well, okay, not
1703 then either :-) or execs. */
1704 if (remove_status != 0)
1706 /* FIXME! This is obviously non-portable! */
1707 write_pc_pid (stop_pc + 4, ecs->ptid);
1708 /* We need to restart all the threads now,
1709 * unles we're running in scheduler-locked mode.
1710 * Use currently_stepping to determine whether to
1713 /* FIXME MVS: is there any reason not to call resume()? */
1714 if (scheduler_mode == schedlock_on)
1715 target_resume (ecs->ptid,
1716 currently_stepping (ecs), TARGET_SIGNAL_0);
1718 target_resume (RESUME_ALL,
1719 currently_stepping (ecs), TARGET_SIGNAL_0);
1720 prepare_to_wait (ecs);
1725 breakpoints_inserted = 0;
1726 if (!ptid_equal (inferior_ptid, ecs->ptid))
1727 context_switch (ecs);
1728 ecs->waiton_ptid = ecs->ptid;
1729 ecs->wp = &(ecs->ws);
1730 ecs->another_trap = 1;
1732 ecs->infwait_state = infwait_thread_hop_state;
1734 registers_changed ();
1738 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1740 sw_single_step_trap_p = 1;
1741 ecs->random_signal = 0;
1745 ecs->random_signal = 1;
1747 /* See if something interesting happened to the non-current thread. If
1748 so, then switch to that thread. */
1749 if (!ptid_equal (ecs->ptid, inferior_ptid))
1752 fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n");
1754 context_switch (ecs);
1756 if (deprecated_context_hook)
1757 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1760 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1762 /* Pull the single step breakpoints out of the target. */
1763 SOFTWARE_SINGLE_STEP (0, 0);
1764 singlestep_breakpoints_inserted_p = 0;
1767 /* It may not be necessary to disable the watchpoint to stop over
1768 it. For example, the PA can (with some kernel cooperation)
1769 single step over a watchpoint without disabling the watchpoint. */
1770 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1773 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1775 prepare_to_wait (ecs);
1779 /* It is far more common to need to disable a watchpoint to step
1780 the inferior over it. FIXME. What else might a debug
1781 register or page protection watchpoint scheme need here? */
1782 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1784 /* At this point, we are stopped at an instruction which has
1785 attempted to write to a piece of memory under control of
1786 a watchpoint. The instruction hasn't actually executed
1787 yet. If we were to evaluate the watchpoint expression
1788 now, we would get the old value, and therefore no change
1789 would seem to have occurred.
1791 In order to make watchpoints work `right', we really need
1792 to complete the memory write, and then evaluate the
1793 watchpoint expression. The following code does that by
1794 removing the watchpoint (actually, all watchpoints and
1795 breakpoints), single-stepping the target, re-inserting
1796 watchpoints, and then falling through to let normal
1797 single-step processing handle proceed. Since this
1798 includes evaluating watchpoints, things will come to a
1799 stop in the correct manner. */
1802 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1803 remove_breakpoints ();
1804 registers_changed ();
1805 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1807 ecs->waiton_ptid = ecs->ptid;
1808 ecs->wp = &(ecs->ws);
1809 ecs->infwait_state = infwait_nonstep_watch_state;
1810 prepare_to_wait (ecs);
1814 /* It may be possible to simply continue after a watchpoint. */
1815 if (HAVE_CONTINUABLE_WATCHPOINT)
1816 stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws);
1818 ecs->stop_func_start = 0;
1819 ecs->stop_func_end = 0;
1820 ecs->stop_func_name = 0;
1821 /* Don't care about return value; stop_func_start and stop_func_name
1822 will both be 0 if it doesn't work. */
1823 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1824 &ecs->stop_func_start, &ecs->stop_func_end);
1825 ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET;
1826 ecs->another_trap = 0;
1827 bpstat_clear (&stop_bpstat);
1829 stop_stack_dummy = 0;
1830 stop_print_frame = 1;
1831 ecs->random_signal = 0;
1832 stopped_by_random_signal = 0;
1833 breakpoints_failed = 0;
1835 if (stop_signal == TARGET_SIGNAL_TRAP
1837 && gdbarch_single_step_through_delay_p (current_gdbarch)
1838 && currently_stepping (ecs))
1840 /* We're trying to step of a breakpoint. Turns out that we're
1841 also on an instruction that needs to be stepped multiple
1842 times before it's been fully executing. E.g., architectures
1843 with a delay slot. It needs to be stepped twice, once for
1844 the instruction and once for the delay slot. */
1845 int step_through_delay
1846 = gdbarch_single_step_through_delay (current_gdbarch,
1847 get_current_frame ());
1848 if (debug_infrun && step_through_delay)
1849 fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n");
1850 if (step_range_end == 0 && step_through_delay)
1852 /* The user issued a continue when stopped at a breakpoint.
1853 Set up for another trap and get out of here. */
1854 ecs->another_trap = 1;
1858 else if (step_through_delay)
1860 /* The user issued a step when stopped at a breakpoint.
1861 Maybe we should stop, maybe we should not - the delay
1862 slot *might* correspond to a line of source. In any
1863 case, don't decide that here, just set ecs->another_trap,
1864 making sure we single-step again before breakpoints are
1866 ecs->another_trap = 1;
1870 /* Look at the cause of the stop, and decide what to do.
1871 The alternatives are:
1872 1) break; to really stop and return to the debugger,
1873 2) drop through to start up again
1874 (set ecs->another_trap to 1 to single step once)
1875 3) set ecs->random_signal to 1, and the decision between 1 and 2
1876 will be made according to the signal handling tables. */
1878 /* First, distinguish signals caused by the debugger from signals
1879 that have to do with the program's own actions. Note that
1880 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1881 on the operating system version. Here we detect when a SIGILL or
1882 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1883 something similar for SIGSEGV, since a SIGSEGV will be generated
1884 when we're trying to execute a breakpoint instruction on a
1885 non-executable stack. This happens for call dummy breakpoints
1886 for architectures like SPARC that place call dummies on the
1889 if (stop_signal == TARGET_SIGNAL_TRAP
1890 || (breakpoints_inserted
1891 && (stop_signal == TARGET_SIGNAL_ILL
1892 || stop_signal == TARGET_SIGNAL_SEGV
1893 || stop_signal == TARGET_SIGNAL_EMT))
1894 || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1896 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1899 fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n");
1900 stop_print_frame = 0;
1901 stop_stepping (ecs);
1905 /* This is originated from start_remote(), start_inferior() and
1906 shared libraries hook functions. */
1907 if (stop_soon == STOP_QUIETLY)
1910 fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
1911 stop_stepping (ecs);
1915 /* This originates from attach_command(). We need to overwrite
1916 the stop_signal here, because some kernels don't ignore a
1917 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1918 See more comments in inferior.h. */
1919 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1921 stop_stepping (ecs);
1922 if (stop_signal == TARGET_SIGNAL_STOP)
1923 stop_signal = TARGET_SIGNAL_0;
1927 /* Don't even think about breakpoints if just proceeded over a
1929 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1932 fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n");
1933 bpstat_clear (&stop_bpstat);
1937 /* See if there is a breakpoint at the current PC. */
1938 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid,
1939 stopped_by_watchpoint);
1941 /* Following in case break condition called a
1943 stop_print_frame = 1;
1946 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1947 at one stage in the past included checks for an inferior
1948 function call's call dummy's return breakpoint. The original
1949 comment, that went with the test, read:
1951 ``End of a stack dummy. Some systems (e.g. Sony news) give
1952 another signal besides SIGTRAP, so check here as well as
1955 If someone ever tries to get get call dummys on a
1956 non-executable stack to work (where the target would stop
1957 with something like a SIGSEGV), then those tests might need
1958 to be re-instated. Given, however, that the tests were only
1959 enabled when momentary breakpoints were not being used, I
1960 suspect that it won't be the case.
1962 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1963 be necessary for call dummies on a non-executable stack on
1966 if (stop_signal == TARGET_SIGNAL_TRAP)
1968 = !(bpstat_explains_signal (stop_bpstat)
1970 || (step_range_end && step_resume_breakpoint == NULL));
1973 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1974 if (!ecs->random_signal)
1975 stop_signal = TARGET_SIGNAL_TRAP;
1979 /* When we reach this point, we've pretty much decided
1980 that the reason for stopping must've been a random
1981 (unexpected) signal. */
1984 ecs->random_signal = 1;
1986 process_event_stop_test:
1987 /* For the program's own signals, act according to
1988 the signal handling tables. */
1990 if (ecs->random_signal)
1992 /* Signal not for debugging purposes. */
1996 fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal);
1998 stopped_by_random_signal = 1;
2000 if (signal_print[stop_signal])
2003 target_terminal_ours_for_output ();
2004 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
2006 if (signal_stop[stop_signal])
2008 stop_stepping (ecs);
2011 /* If not going to stop, give terminal back
2012 if we took it away. */
2014 target_terminal_inferior ();
2016 /* Clear the signal if it should not be passed. */
2017 if (signal_program[stop_signal] == 0)
2018 stop_signal = TARGET_SIGNAL_0;
2020 if (prev_pc == read_pc ()
2021 && !breakpoints_inserted
2022 && breakpoint_here_p (read_pc ())
2023 && step_resume_breakpoint == NULL)
2025 /* We were just starting a new sequence, attempting to
2026 single-step off of a breakpoint and expecting a SIGTRAP.
2027 Intead this signal arrives. This signal will take us out
2028 of the stepping range so GDB needs to remember to, when
2029 the signal handler returns, resume stepping off that
2031 /* To simplify things, "continue" is forced to use the same
2032 code paths as single-step - set a breakpoint at the
2033 signal return address and then, once hit, step off that
2035 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2036 ecs->step_after_step_resume_breakpoint = 1;
2041 if (step_range_end != 0
2042 && stop_signal != TARGET_SIGNAL_0
2043 && stop_pc >= step_range_start && stop_pc < step_range_end
2044 && frame_id_eq (get_frame_id (get_current_frame ()),
2046 && step_resume_breakpoint == NULL)
2048 /* The inferior is about to take a signal that will take it
2049 out of the single step range. Set a breakpoint at the
2050 current PC (which is presumably where the signal handler
2051 will eventually return) and then allow the inferior to
2054 Note that this is only needed for a signal delivered
2055 while in the single-step range. Nested signals aren't a
2056 problem as they eventually all return. */
2057 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2062 /* Note: step_resume_breakpoint may be non-NULL. This occures
2063 when either there's a nested signal, or when there's a
2064 pending signal enabled just as the signal handler returns
2065 (leaving the inferior at the step-resume-breakpoint without
2066 actually executing it). Either way continue until the
2067 breakpoint is really hit. */
2072 /* Handle cases caused by hitting a breakpoint. */
2074 CORE_ADDR jmp_buf_pc;
2075 struct bpstat_what what;
2077 what = bpstat_what (stop_bpstat);
2079 if (what.call_dummy)
2081 stop_stack_dummy = 1;
2084 switch (what.main_action)
2086 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2087 /* If we hit the breakpoint at longjmp, disable it for the
2088 duration of this command. Then, install a temporary
2089 breakpoint at the target of the jmp_buf. */
2091 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2092 disable_longjmp_breakpoint ();
2093 remove_breakpoints ();
2094 breakpoints_inserted = 0;
2095 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
2101 /* Need to blow away step-resume breakpoint, as it
2102 interferes with us */
2103 if (step_resume_breakpoint != NULL)
2105 delete_step_resume_breakpoint (&step_resume_breakpoint);
2108 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2109 ecs->handling_longjmp = 1; /* FIXME */
2113 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2114 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2116 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2117 remove_breakpoints ();
2118 breakpoints_inserted = 0;
2119 disable_longjmp_breakpoint ();
2120 ecs->handling_longjmp = 0; /* FIXME */
2121 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2123 /* else fallthrough */
2125 case BPSTAT_WHAT_SINGLE:
2127 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n");
2128 if (breakpoints_inserted)
2130 remove_breakpoints ();
2132 breakpoints_inserted = 0;
2133 ecs->another_trap = 1;
2134 /* Still need to check other stuff, at least the case
2135 where we are stepping and step out of the right range. */
2138 case BPSTAT_WHAT_STOP_NOISY:
2140 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2141 stop_print_frame = 1;
2143 /* We are about to nuke the step_resume_breakpointt via the
2144 cleanup chain, so no need to worry about it here. */
2146 stop_stepping (ecs);
2149 case BPSTAT_WHAT_STOP_SILENT:
2151 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2152 stop_print_frame = 0;
2154 /* We are about to nuke the step_resume_breakpoin via the
2155 cleanup chain, so no need to worry about it here. */
2157 stop_stepping (ecs);
2160 case BPSTAT_WHAT_STEP_RESUME:
2161 /* This proably demands a more elegant solution, but, yeah
2164 This function's use of the simple variable
2165 step_resume_breakpoint doesn't seem to accomodate
2166 simultaneously active step-resume bp's, although the
2167 breakpoint list certainly can.
2169 If we reach here and step_resume_breakpoint is already
2170 NULL, then apparently we have multiple active
2171 step-resume bp's. We'll just delete the breakpoint we
2172 stopped at, and carry on.
2174 Correction: what the code currently does is delete a
2175 step-resume bp, but it makes no effort to ensure that
2176 the one deleted is the one currently stopped at. MVS */
2179 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2181 if (step_resume_breakpoint == NULL)
2183 step_resume_breakpoint =
2184 bpstat_find_step_resume_breakpoint (stop_bpstat);
2186 delete_step_resume_breakpoint (&step_resume_breakpoint);
2187 if (ecs->step_after_step_resume_breakpoint)
2189 /* Back when the step-resume breakpoint was inserted, we
2190 were trying to single-step off a breakpoint. Go back
2192 ecs->step_after_step_resume_breakpoint = 0;
2193 remove_breakpoints ();
2194 breakpoints_inserted = 0;
2195 ecs->another_trap = 1;
2201 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2203 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_THROUGH_SIGTRAMP\n");
2204 /* If were waiting for a trap, hitting the step_resume_break
2205 doesn't count as getting it. */
2207 ecs->another_trap = 1;
2210 case BPSTAT_WHAT_CHECK_SHLIBS:
2211 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2214 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2215 /* Remove breakpoints, we eventually want to step over the
2216 shlib event breakpoint, and SOLIB_ADD might adjust
2217 breakpoint addresses via breakpoint_re_set. */
2218 if (breakpoints_inserted)
2219 remove_breakpoints ();
2220 breakpoints_inserted = 0;
2222 /* Check for any newly added shared libraries if we're
2223 supposed to be adding them automatically. Switch
2224 terminal for any messages produced by
2225 breakpoint_re_set. */
2226 target_terminal_ours_for_output ();
2227 /* NOTE: cagney/2003-11-25: Make certain that the target
2228 stack's section table is kept up-to-date. Architectures,
2229 (e.g., PPC64), use the section table to perform
2230 operations such as address => section name and hence
2231 require the table to contain all sections (including
2232 those found in shared libraries). */
2233 /* NOTE: cagney/2003-11-25: Pass current_target and not
2234 exec_ops to SOLIB_ADD. This is because current GDB is
2235 only tooled to propagate section_table changes out from
2236 the "current_target" (see target_resize_to_sections), and
2237 not up from the exec stratum. This, of course, isn't
2238 right. "infrun.c" should only interact with the
2239 exec/process stratum, instead relying on the target stack
2240 to propagate relevant changes (stop, section table
2241 changed, ...) up to other layers. */
2243 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2245 solib_add (NULL, 0, ¤t_target, auto_solib_add);
2247 target_terminal_inferior ();
2249 /* Try to reenable shared library breakpoints, additional
2250 code segments in shared libraries might be mapped in now. */
2251 re_enable_breakpoints_in_shlibs ();
2253 /* If requested, stop when the dynamic linker notifies
2254 gdb of events. This allows the user to get control
2255 and place breakpoints in initializer routines for
2256 dynamically loaded objects (among other things). */
2257 if (stop_on_solib_events || stop_stack_dummy)
2259 stop_stepping (ecs);
2263 /* If we stopped due to an explicit catchpoint, then the
2264 (see above) call to SOLIB_ADD pulled in any symbols
2265 from a newly-loaded library, if appropriate.
2267 We do want the inferior to stop, but not where it is
2268 now, which is in the dynamic linker callback. Rather,
2269 we would like it stop in the user's program, just after
2270 the call that caused this catchpoint to trigger. That
2271 gives the user a more useful vantage from which to
2272 examine their program's state. */
2273 else if (what.main_action
2274 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2276 /* ??rehrauer: If I could figure out how to get the
2277 right return PC from here, we could just set a temp
2278 breakpoint and resume. I'm not sure we can without
2279 cracking open the dld's shared libraries and sniffing
2280 their unwind tables and text/data ranges, and that's
2281 not a terribly portable notion.
2283 Until that time, we must step the inferior out of the
2284 dld callback, and also out of the dld itself (and any
2285 code or stubs in libdld.sl, such as "shl_load" and
2286 friends) until we reach non-dld code. At that point,
2287 we can stop stepping. */
2288 bpstat_get_triggered_catchpoints (stop_bpstat,
2290 stepping_through_solib_catchpoints);
2291 ecs->stepping_through_solib_after_catch = 1;
2293 /* Be sure to lift all breakpoints, so the inferior does
2294 actually step past this point... */
2295 ecs->another_trap = 1;
2300 /* We want to step over this breakpoint, then keep going. */
2301 ecs->another_trap = 1;
2307 case BPSTAT_WHAT_LAST:
2308 /* Not a real code, but listed here to shut up gcc -Wall. */
2310 case BPSTAT_WHAT_KEEP_CHECKING:
2315 /* We come here if we hit a breakpoint but should not
2316 stop for it. Possibly we also were stepping
2317 and should stop for that. So fall through and
2318 test for stepping. But, if not stepping,
2321 /* Are we stepping to get the inferior out of the dynamic linker's
2322 hook (and possibly the dld itself) after catching a shlib
2324 if (ecs->stepping_through_solib_after_catch)
2326 #if defined(SOLIB_ADD)
2327 /* Have we reached our destination? If not, keep going. */
2328 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2331 fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n");
2332 ecs->another_trap = 1;
2338 fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n");
2339 /* Else, stop and report the catchpoint(s) whose triggering
2340 caused us to begin stepping. */
2341 ecs->stepping_through_solib_after_catch = 0;
2342 bpstat_clear (&stop_bpstat);
2343 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2344 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2345 stop_print_frame = 1;
2346 stop_stepping (ecs);
2350 if (step_resume_breakpoint)
2353 fprintf_unfiltered (gdb_stdlog, "infrun: step-resume breakpoint\n");
2355 /* Having a step-resume breakpoint overrides anything
2356 else having to do with stepping commands until
2357 that breakpoint is reached. */
2362 if (step_range_end == 0)
2365 fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n");
2366 /* Likewise if we aren't even stepping. */
2371 /* If stepping through a line, keep going if still within it.
2373 Note that step_range_end is the address of the first instruction
2374 beyond the step range, and NOT the address of the last instruction
2376 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2379 fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n",
2380 paddr_nz (step_range_start),
2381 paddr_nz (step_range_end));
2386 /* We stepped out of the stepping range. */
2388 /* If we are stepping at the source level and entered the runtime
2389 loader dynamic symbol resolution code, we keep on single stepping
2390 until we exit the run time loader code and reach the callee's
2392 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2393 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2394 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)
2396 && in_solib_dynsym_resolve_code (stop_pc)
2400 CORE_ADDR pc_after_resolver =
2401 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2404 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n");
2406 if (pc_after_resolver)
2408 /* Set up a step-resume breakpoint at the address
2409 indicated by SKIP_SOLIB_RESOLVER. */
2410 struct symtab_and_line sr_sal;
2412 sr_sal.pc = pc_after_resolver;
2414 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2421 if (step_range_end != 1
2422 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2423 || step_over_calls == STEP_OVER_ALL)
2424 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2427 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n");
2428 /* The inferior, while doing a "step" or "next", has ended up in
2429 a signal trampoline (either by a signal being delivered or by
2430 the signal handler returning). Just single-step until the
2431 inferior leaves the trampoline (either by calling the handler
2437 /* Check for subroutine calls. The check for the current frame
2438 equalling the step ID is not necessary - the check of the
2439 previous frame's ID is sufficient - but it is a common case and
2440 cheaper than checking the previous frame's ID.
2442 NOTE: frame_id_eq will never report two invalid frame IDs as
2443 being equal, so to get into this block, both the current and
2444 previous frame must have valid frame IDs. */
2445 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id)
2446 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id))
2448 CORE_ADDR real_stop_pc;
2451 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n");
2453 if ((step_over_calls == STEP_OVER_NONE)
2454 || ((step_range_end == 1)
2455 && in_prologue (prev_pc, ecs->stop_func_start)))
2457 /* I presume that step_over_calls is only 0 when we're
2458 supposed to be stepping at the assembly language level
2459 ("stepi"). Just stop. */
2460 /* Also, maybe we just did a "nexti" inside a prolog, so we
2461 thought it was a subroutine call but it was not. Stop as
2464 print_stop_reason (END_STEPPING_RANGE, 0);
2465 stop_stepping (ecs);
2469 if (step_over_calls == STEP_OVER_ALL)
2471 /* We're doing a "next", set a breakpoint at callee's return
2472 address (the address at which the caller will
2474 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2479 /* If we are in a function call trampoline (a stub between the
2480 calling routine and the real function), locate the real
2481 function. That's what tells us (a) whether we want to step
2482 into it at all, and (b) what prologue we want to run to the
2483 end of, if we do step into it. */
2484 real_stop_pc = skip_language_trampoline (stop_pc);
2485 if (real_stop_pc == 0)
2486 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2487 if (real_stop_pc != 0)
2488 ecs->stop_func_start = real_stop_pc;
2491 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2492 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)
2494 in_solib_dynsym_resolve_code (ecs->stop_func_start)
2498 struct symtab_and_line sr_sal;
2500 sr_sal.pc = ecs->stop_func_start;
2502 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2507 /* If we have line number information for the function we are
2508 thinking of stepping into, step into it.
2510 If there are several symtabs at that PC (e.g. with include
2511 files), just want to know whether *any* of them have line
2512 numbers. find_pc_line handles this. */
2514 struct symtab_and_line tmp_sal;
2516 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2517 if (tmp_sal.line != 0)
2519 step_into_function (ecs);
2524 /* If we have no line number and the step-stop-if-no-debug is
2525 set, we stop the step so that the user has a chance to switch
2526 in assembly mode. */
2527 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2530 print_stop_reason (END_STEPPING_RANGE, 0);
2531 stop_stepping (ecs);
2535 /* Set a breakpoint at callee's return address (the address at
2536 which the caller will resume). */
2537 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2542 /* If we're in the return path from a shared library trampoline,
2543 we want to proceed through the trampoline when stepping. */
2544 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2546 /* Determine where this trampoline returns. */
2547 CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2550 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n");
2552 /* Only proceed through if we know where it's going. */
2555 /* And put the step-breakpoint there and go until there. */
2556 struct symtab_and_line sr_sal;
2558 init_sal (&sr_sal); /* initialize to zeroes */
2559 sr_sal.pc = real_stop_pc;
2560 sr_sal.section = find_pc_overlay (sr_sal.pc);
2562 /* Do not specify what the fp should be when we stop since
2563 on some machines the prologue is where the new fp value
2565 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2567 /* Restart without fiddling with the step ranges or
2574 ecs->sal = find_pc_line (stop_pc, 0);
2576 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2577 the trampoline processing logic, however, there are some trampolines
2578 that have no names, so we should do trampoline handling first. */
2579 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2580 && ecs->stop_func_name == NULL
2581 && ecs->sal.line == 0)
2584 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n");
2586 /* The inferior just stepped into, or returned to, an
2587 undebuggable function (where there is no debugging information
2588 and no line number corresponding to the address where the
2589 inferior stopped). Since we want to skip this kind of code,
2590 we keep going until the inferior returns from this
2591 function - unless the user has asked us not to (via
2592 set step-mode) or we no longer know how to get back
2593 to the call site. */
2594 if (step_stop_if_no_debug
2595 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2597 /* If we have no line number and the step-stop-if-no-debug
2598 is set, we stop the step so that the user has a chance to
2599 switch in assembly mode. */
2601 print_stop_reason (END_STEPPING_RANGE, 0);
2602 stop_stepping (ecs);
2607 /* Set a breakpoint at callee's return address (the address
2608 at which the caller will resume). */
2609 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2615 if (step_range_end == 1)
2617 /* It is stepi or nexti. We always want to stop stepping after
2620 fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n");
2622 print_stop_reason (END_STEPPING_RANGE, 0);
2623 stop_stepping (ecs);
2627 if (ecs->sal.line == 0)
2629 /* We have no line number information. That means to stop
2630 stepping (does this always happen right after one instruction,
2631 when we do "s" in a function with no line numbers,
2632 or can this happen as a result of a return or longjmp?). */
2634 fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n");
2636 print_stop_reason (END_STEPPING_RANGE, 0);
2637 stop_stepping (ecs);
2641 if ((stop_pc == ecs->sal.pc)
2642 && (ecs->current_line != ecs->sal.line
2643 || ecs->current_symtab != ecs->sal.symtab))
2645 /* We are at the start of a different line. So stop. Note that
2646 we don't stop if we step into the middle of a different line.
2647 That is said to make things like for (;;) statements work
2650 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n");
2652 print_stop_reason (END_STEPPING_RANGE, 0);
2653 stop_stepping (ecs);
2657 /* We aren't done stepping.
2659 Optimize by setting the stepping range to the line.
2660 (We might not be in the original line, but if we entered a
2661 new line in mid-statement, we continue stepping. This makes
2662 things like for(;;) statements work better.) */
2664 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2666 /* If this is the last line of the function, don't keep stepping
2667 (it would probably step us out of the function).
2668 This is particularly necessary for a one-line function,
2669 in which after skipping the prologue we better stop even though
2670 we will be in mid-line. */
2672 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n");
2674 print_stop_reason (END_STEPPING_RANGE, 0);
2675 stop_stepping (ecs);
2678 step_range_start = ecs->sal.pc;
2679 step_range_end = ecs->sal.end;
2680 step_frame_id = get_frame_id (get_current_frame ());
2681 ecs->current_line = ecs->sal.line;
2682 ecs->current_symtab = ecs->sal.symtab;
2684 /* In the case where we just stepped out of a function into the
2685 middle of a line of the caller, continue stepping, but
2686 step_frame_id must be modified to current frame */
2688 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2689 generous. It will trigger on things like a step into a frameless
2690 stackless leaf function. I think the logic should instead look
2691 at the unwound frame ID has that should give a more robust
2692 indication of what happened. */
2693 if (step - ID == current - ID)
2694 still stepping in same function;
2695 else if (step - ID == unwind (current - ID))
2696 stepped into a function;
2698 stepped out of a function;
2699 /* Of course this assumes that the frame ID unwind code is robust
2700 and we're willing to introduce frame unwind logic into this
2701 function. Fortunately, those days are nearly upon us. */
2704 struct frame_id current_frame = get_frame_id (get_current_frame ());
2705 if (!(frame_id_inner (current_frame, step_frame_id)))
2706 step_frame_id = current_frame;
2710 fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n");
2714 /* Are we in the middle of stepping? */
2717 currently_stepping (struct execution_control_state *ecs)
2719 return ((!ecs->handling_longjmp
2720 && ((step_range_end && step_resume_breakpoint == NULL)
2722 || ecs->stepping_through_solib_after_catch
2723 || bpstat_should_step ());
2726 /* Subroutine call with source code we should not step over. Do step
2727 to the first line of code in it. */
2730 step_into_function (struct execution_control_state *ecs)
2733 struct symtab_and_line sr_sal;
2735 s = find_pc_symtab (stop_pc);
2736 if (s && s->language != language_asm)
2737 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2739 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2740 /* Use the step_resume_break to step until the end of the prologue,
2741 even if that involves jumps (as it seems to on the vax under
2743 /* If the prologue ends in the middle of a source line, continue to
2744 the end of that source line (if it is still within the function).
2745 Otherwise, just go to end of prologue. */
2747 && ecs->sal.pc != ecs->stop_func_start
2748 && ecs->sal.end < ecs->stop_func_end)
2749 ecs->stop_func_start = ecs->sal.end;
2751 /* Architectures which require breakpoint adjustment might not be able
2752 to place a breakpoint at the computed address. If so, the test
2753 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2754 ecs->stop_func_start to an address at which a breakpoint may be
2755 legitimately placed.
2757 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2758 made, GDB will enter an infinite loop when stepping through
2759 optimized code consisting of VLIW instructions which contain
2760 subinstructions corresponding to different source lines. On
2761 FR-V, it's not permitted to place a breakpoint on any but the
2762 first subinstruction of a VLIW instruction. When a breakpoint is
2763 set, GDB will adjust the breakpoint address to the beginning of
2764 the VLIW instruction. Thus, we need to make the corresponding
2765 adjustment here when computing the stop address. */
2767 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2769 ecs->stop_func_start
2770 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2771 ecs->stop_func_start);
2774 if (ecs->stop_func_start == stop_pc)
2776 /* We are already there: stop now. */
2778 print_stop_reason (END_STEPPING_RANGE, 0);
2779 stop_stepping (ecs);
2784 /* Put the step-breakpoint there and go until there. */
2785 init_sal (&sr_sal); /* initialize to zeroes */
2786 sr_sal.pc = ecs->stop_func_start;
2787 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2789 /* Do not specify what the fp should be when we stop since on
2790 some machines the prologue is where the new fp value is
2792 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2794 /* And make sure stepping stops right away then. */
2795 step_range_end = step_range_start;
2800 /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID.
2801 This is used to both functions and to skip over code. */
2804 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
2805 struct frame_id sr_id)
2807 /* There should never be more than one step-resume breakpoint per
2808 thread, so we should never be setting a new
2809 step_resume_breakpoint when one is already active. */
2810 gdb_assert (step_resume_breakpoint == NULL);
2811 step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id,
2813 if (breakpoints_inserted)
2814 insert_breakpoints ();
2817 /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used
2818 to skip a potential signal handler.
2820 This is called with the interrupted function's frame. The signal
2821 handler, when it returns, will resume the interrupted function at
2825 insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame)
2827 struct symtab_and_line sr_sal;
2829 init_sal (&sr_sal); /* initialize to zeros */
2831 sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame));
2832 sr_sal.section = find_pc_overlay (sr_sal.pc);
2834 insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame));
2837 /* Similar to insert_step_resume_breakpoint_at_frame, except
2838 but a breakpoint at the previous frame's PC. This is used to
2839 skip a function after stepping into it (for "next" or if the called
2840 function has no debugging information).
2842 The current function has almost always been reached by single
2843 stepping a call or return instruction. NEXT_FRAME belongs to the
2844 current function, and the breakpoint will be set at the caller's
2847 This is a separate function rather than reusing
2848 insert_step_resume_breakpoint_at_frame in order to avoid
2849 get_prev_frame, which may stop prematurely (see the implementation
2850 of frame_unwind_id for an example). */
2853 insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame)
2855 struct symtab_and_line sr_sal;
2857 /* We shouldn't have gotten here if we don't know where the call site
2859 gdb_assert (frame_id_p (frame_unwind_id (next_frame)));
2861 init_sal (&sr_sal); /* initialize to zeros */
2863 sr_sal.pc = ADDR_BITS_REMOVE (frame_pc_unwind (next_frame));
2864 sr_sal.section = find_pc_overlay (sr_sal.pc);
2866 insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame));
2870 stop_stepping (struct execution_control_state *ecs)
2873 fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n");
2875 /* Let callers know we don't want to wait for the inferior anymore. */
2876 ecs->wait_some_more = 0;
2879 /* This function handles various cases where we need to continue
2880 waiting for the inferior. */
2881 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2884 keep_going (struct execution_control_state *ecs)
2886 /* Save the pc before execution, to compare with pc after stop. */
2887 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2889 /* If we did not do break;, it means we should keep running the
2890 inferior and not return to debugger. */
2892 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2894 /* We took a signal (which we are supposed to pass through to
2895 the inferior, else we'd have done a break above) and we
2896 haven't yet gotten our trap. Simply continue. */
2897 resume (currently_stepping (ecs), stop_signal);
2901 /* Either the trap was not expected, but we are continuing
2902 anyway (the user asked that this signal be passed to the
2905 The signal was SIGTRAP, e.g. it was our signal, but we
2906 decided we should resume from it.
2908 We're going to run this baby now! */
2910 if (!breakpoints_inserted && !ecs->another_trap)
2912 breakpoints_failed = insert_breakpoints ();
2913 if (breakpoints_failed)
2915 stop_stepping (ecs);
2918 breakpoints_inserted = 1;
2921 trap_expected = ecs->another_trap;
2923 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2924 specifies that such a signal should be delivered to the
2927 Typically, this would occure when a user is debugging a
2928 target monitor on a simulator: the target monitor sets a
2929 breakpoint; the simulator encounters this break-point and
2930 halts the simulation handing control to GDB; GDB, noteing
2931 that the break-point isn't valid, returns control back to the
2932 simulator; the simulator then delivers the hardware
2933 equivalent of a SIGNAL_TRAP to the program being debugged. */
2935 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2936 stop_signal = TARGET_SIGNAL_0;
2939 resume (currently_stepping (ecs), stop_signal);
2942 prepare_to_wait (ecs);
2945 /* This function normally comes after a resume, before
2946 handle_inferior_event exits. It takes care of any last bits of
2947 housekeeping, and sets the all-important wait_some_more flag. */
2950 prepare_to_wait (struct execution_control_state *ecs)
2953 fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
2954 if (ecs->infwait_state == infwait_normal_state)
2956 overlay_cache_invalid = 1;
2958 /* We have to invalidate the registers BEFORE calling
2959 target_wait because they can be loaded from the target while
2960 in target_wait. This makes remote debugging a bit more
2961 efficient for those targets that provide critical registers
2962 as part of their normal status mechanism. */
2964 registers_changed ();
2965 ecs->waiton_ptid = pid_to_ptid (-1);
2966 ecs->wp = &(ecs->ws);
2968 /* This is the old end of the while loop. Let everybody know we
2969 want to wait for the inferior some more and get called again
2971 ecs->wait_some_more = 1;
2974 /* Print why the inferior has stopped. We always print something when
2975 the inferior exits, or receives a signal. The rest of the cases are
2976 dealt with later on in normal_stop() and print_it_typical(). Ideally
2977 there should be a call to this function from handle_inferior_event()
2978 each time stop_stepping() is called.*/
2980 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2982 switch (stop_reason)
2984 case END_STEPPING_RANGE:
2985 /* We are done with a step/next/si/ni command. */
2986 /* For now print nothing. */
2987 /* Print a message only if not in the middle of doing a "step n"
2988 operation for n > 1 */
2989 if (!step_multi || !stop_step)
2990 if (ui_out_is_mi_like_p (uiout))
2993 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE));
2996 /* The inferior was terminated by a signal. */
2997 annotate_signalled ();
2998 if (ui_out_is_mi_like_p (uiout))
3001 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED));
3002 ui_out_text (uiout, "\nProgram terminated with signal ");
3003 annotate_signal_name ();
3004 ui_out_field_string (uiout, "signal-name",
3005 target_signal_to_name (stop_info));
3006 annotate_signal_name_end ();
3007 ui_out_text (uiout, ", ");
3008 annotate_signal_string ();
3009 ui_out_field_string (uiout, "signal-meaning",
3010 target_signal_to_string (stop_info));
3011 annotate_signal_string_end ();
3012 ui_out_text (uiout, ".\n");
3013 ui_out_text (uiout, "The program no longer exists.\n");
3016 /* The inferior program is finished. */
3017 annotate_exited (stop_info);
3020 if (ui_out_is_mi_like_p (uiout))
3021 ui_out_field_string (uiout, "reason",
3022 async_reason_lookup (EXEC_ASYNC_EXITED));
3023 ui_out_text (uiout, "\nProgram exited with code ");
3024 ui_out_field_fmt (uiout, "exit-code", "0%o",
3025 (unsigned int) stop_info);
3026 ui_out_text (uiout, ".\n");
3030 if (ui_out_is_mi_like_p (uiout))
3033 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY));
3034 ui_out_text (uiout, "\nProgram exited normally.\n");
3036 /* Support the --return-child-result option. */
3037 return_child_result_value = stop_info;
3039 case SIGNAL_RECEIVED:
3040 /* Signal received. The signal table tells us to print about
3043 ui_out_text (uiout, "\nProgram received signal ");
3044 annotate_signal_name ();
3045 if (ui_out_is_mi_like_p (uiout))
3047 (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED));
3048 ui_out_field_string (uiout, "signal-name",
3049 target_signal_to_name (stop_info));
3050 annotate_signal_name_end ();
3051 ui_out_text (uiout, ", ");
3052 annotate_signal_string ();
3053 ui_out_field_string (uiout, "signal-meaning",
3054 target_signal_to_string (stop_info));
3055 annotate_signal_string_end ();
3056 ui_out_text (uiout, ".\n");
3059 internal_error (__FILE__, __LINE__,
3060 _("print_stop_reason: unrecognized enum value"));
3066 /* Here to return control to GDB when the inferior stops for real.
3067 Print appropriate messages, remove breakpoints, give terminal our modes.
3069 STOP_PRINT_FRAME nonzero means print the executing frame
3070 (pc, function, args, file, line number and line text).
3071 BREAKPOINTS_FAILED nonzero means stop was due to error
3072 attempting to insert breakpoints. */
3077 struct target_waitstatus last;
3080 get_last_target_status (&last_ptid, &last);
3082 /* As with the notification of thread events, we want to delay
3083 notifying the user that we've switched thread context until
3084 the inferior actually stops.
3086 There's no point in saying anything if the inferior has exited.
3087 Note that SIGNALLED here means "exited with a signal", not
3088 "received a signal". */
3089 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
3090 && target_has_execution
3091 && last.kind != TARGET_WAITKIND_SIGNALLED
3092 && last.kind != TARGET_WAITKIND_EXITED)
3094 target_terminal_ours_for_output ();
3095 printf_filtered (_("[Switching to %s]\n"),
3096 target_pid_or_tid_to_str (inferior_ptid));
3097 previous_inferior_ptid = inferior_ptid;
3100 /* NOTE drow/2004-01-17: Is this still necessary? */
3101 /* Make sure that the current_frame's pc is correct. This
3102 is a correction for setting up the frame info before doing
3103 DECR_PC_AFTER_BREAK */
3104 if (target_has_execution)
3105 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3106 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3107 frame code to check for this and sort out any resultant mess.
3108 DECR_PC_AFTER_BREAK needs to just go away. */
3109 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3111 if (target_has_execution && breakpoints_inserted)
3113 if (remove_breakpoints ())
3115 target_terminal_ours_for_output ();
3116 printf_filtered (_("\
3117 Cannot remove breakpoints because program is no longer writable.\n\
3118 It might be running in another process.\n\
3119 Further execution is probably impossible.\n"));
3122 breakpoints_inserted = 0;
3124 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3125 Delete any breakpoint that is to be deleted at the next stop. */
3127 breakpoint_auto_delete (stop_bpstat);
3129 /* If an auto-display called a function and that got a signal,
3130 delete that auto-display to avoid an infinite recursion. */
3132 if (stopped_by_random_signal)
3133 disable_current_display ();
3135 /* Don't print a message if in the middle of doing a "step n"
3136 operation for n > 1 */
3137 if (step_multi && stop_step)
3140 target_terminal_ours ();
3142 /* Set the current source location. This will also happen if we
3143 display the frame below, but the current SAL will be incorrect
3144 during a user hook-stop function. */
3145 if (target_has_stack && !stop_stack_dummy)
3146 set_current_sal_from_frame (get_current_frame (), 1);
3148 /* Look up the hook_stop and run it (CLI internally handles problem
3149 of stop_command's pre-hook not existing). */
3151 catch_errors (hook_stop_stub, stop_command,
3152 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3154 if (!target_has_stack)
3160 /* Select innermost stack frame - i.e., current frame is frame 0,
3161 and current location is based on that.
3162 Don't do this on return from a stack dummy routine,
3163 or if the program has exited. */
3165 if (!stop_stack_dummy)
3167 select_frame (get_current_frame ());
3169 /* Print current location without a level number, if
3170 we have changed functions or hit a breakpoint.
3171 Print source line if we have one.
3172 bpstat_print() contains the logic deciding in detail
3173 what to print, based on the event(s) that just occurred. */
3175 if (stop_print_frame)
3179 int do_frame_printing = 1;
3181 bpstat_ret = bpstat_print (stop_bpstat);
3185 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3186 (or should) carry around the function and does (or
3187 should) use that when doing a frame comparison. */
3189 && frame_id_eq (step_frame_id,
3190 get_frame_id (get_current_frame ()))
3191 && step_start_function == find_pc_function (stop_pc))
3192 source_flag = SRC_LINE; /* finished step, just print source line */
3194 source_flag = SRC_AND_LOC; /* print location and source line */
3196 case PRINT_SRC_AND_LOC:
3197 source_flag = SRC_AND_LOC; /* print location and source line */
3199 case PRINT_SRC_ONLY:
3200 source_flag = SRC_LINE;
3203 source_flag = SRC_LINE; /* something bogus */
3204 do_frame_printing = 0;
3207 internal_error (__FILE__, __LINE__, _("Unknown value."));
3209 /* For mi, have the same behavior every time we stop:
3210 print everything but the source line. */
3211 if (ui_out_is_mi_like_p (uiout))
3212 source_flag = LOC_AND_ADDRESS;
3214 if (ui_out_is_mi_like_p (uiout))
3215 ui_out_field_int (uiout, "thread-id",
3216 pid_to_thread_id (inferior_ptid));
3217 /* The behavior of this routine with respect to the source
3219 SRC_LINE: Print only source line
3220 LOCATION: Print only location
3221 SRC_AND_LOC: Print location and source line */
3222 if (do_frame_printing)
3223 print_stack_frame (get_selected_frame (NULL), 0, source_flag);
3225 /* Display the auto-display expressions. */
3230 /* Save the function value return registers, if we care.
3231 We might be about to restore their previous contents. */
3232 if (proceed_to_finish)
3233 /* NB: The copy goes through to the target picking up the value of
3234 all the registers. */
3235 regcache_cpy (stop_registers, current_regcache);
3237 if (stop_stack_dummy)
3239 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3240 ends with a setting of the current frame, so we can use that
3242 frame_pop (get_current_frame ());
3243 /* Set stop_pc to what it was before we called the function.
3244 Can't rely on restore_inferior_status because that only gets
3245 called if we don't stop in the called function. */
3246 stop_pc = read_pc ();
3247 select_frame (get_current_frame ());
3251 annotate_stopped ();
3252 observer_notify_normal_stop (stop_bpstat);
3256 hook_stop_stub (void *cmd)
3258 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3263 signal_stop_state (int signo)
3265 return signal_stop[signo];
3269 signal_print_state (int signo)
3271 return signal_print[signo];
3275 signal_pass_state (int signo)
3277 return signal_program[signo];
3281 signal_stop_update (int signo, int state)
3283 int ret = signal_stop[signo];
3284 signal_stop[signo] = state;
3289 signal_print_update (int signo, int state)
3291 int ret = signal_print[signo];
3292 signal_print[signo] = state;
3297 signal_pass_update (int signo, int state)
3299 int ret = signal_program[signo];
3300 signal_program[signo] = state;
3305 sig_print_header (void)
3307 printf_filtered (_("\
3308 Signal Stop\tPrint\tPass to program\tDescription\n"));
3312 sig_print_info (enum target_signal oursig)
3314 char *name = target_signal_to_name (oursig);
3315 int name_padding = 13 - strlen (name);
3317 if (name_padding <= 0)
3320 printf_filtered ("%s", name);
3321 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3322 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3323 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3324 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3325 printf_filtered ("%s\n", target_signal_to_string (oursig));
3328 /* Specify how various signals in the inferior should be handled. */
3331 handle_command (char *args, int from_tty)
3334 int digits, wordlen;
3335 int sigfirst, signum, siglast;
3336 enum target_signal oursig;
3339 unsigned char *sigs;
3340 struct cleanup *old_chain;
3344 error_no_arg (_("signal to handle"));
3347 /* Allocate and zero an array of flags for which signals to handle. */
3349 nsigs = (int) TARGET_SIGNAL_LAST;
3350 sigs = (unsigned char *) alloca (nsigs);
3351 memset (sigs, 0, nsigs);
3353 /* Break the command line up into args. */
3355 argv = buildargv (args);
3360 old_chain = make_cleanup_freeargv (argv);
3362 /* Walk through the args, looking for signal oursigs, signal names, and
3363 actions. Signal numbers and signal names may be interspersed with
3364 actions, with the actions being performed for all signals cumulatively
3365 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3367 while (*argv != NULL)
3369 wordlen = strlen (*argv);
3370 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3374 sigfirst = siglast = -1;
3376 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3378 /* Apply action to all signals except those used by the
3379 debugger. Silently skip those. */
3382 siglast = nsigs - 1;
3384 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3386 SET_SIGS (nsigs, sigs, signal_stop);
3387 SET_SIGS (nsigs, sigs, signal_print);
3389 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3391 UNSET_SIGS (nsigs, sigs, signal_program);
3393 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3395 SET_SIGS (nsigs, sigs, signal_print);
3397 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3399 SET_SIGS (nsigs, sigs, signal_program);
3401 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3403 UNSET_SIGS (nsigs, sigs, signal_stop);
3405 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3407 SET_SIGS (nsigs, sigs, signal_program);
3409 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3411 UNSET_SIGS (nsigs, sigs, signal_print);
3412 UNSET_SIGS (nsigs, sigs, signal_stop);
3414 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3416 UNSET_SIGS (nsigs, sigs, signal_program);
3418 else if (digits > 0)
3420 /* It is numeric. The numeric signal refers to our own
3421 internal signal numbering from target.h, not to host/target
3422 signal number. This is a feature; users really should be
3423 using symbolic names anyway, and the common ones like
3424 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3426 sigfirst = siglast = (int)
3427 target_signal_from_command (atoi (*argv));
3428 if ((*argv)[digits] == '-')
3431 target_signal_from_command (atoi ((*argv) + digits + 1));
3433 if (sigfirst > siglast)
3435 /* Bet he didn't figure we'd think of this case... */
3443 oursig = target_signal_from_name (*argv);
3444 if (oursig != TARGET_SIGNAL_UNKNOWN)
3446 sigfirst = siglast = (int) oursig;
3450 /* Not a number and not a recognized flag word => complain. */
3451 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv);
3455 /* If any signal numbers or symbol names were found, set flags for
3456 which signals to apply actions to. */
3458 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3460 switch ((enum target_signal) signum)
3462 case TARGET_SIGNAL_TRAP:
3463 case TARGET_SIGNAL_INT:
3464 if (!allsigs && !sigs[signum])
3466 if (query ("%s is used by the debugger.\n\
3467 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3473 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3474 gdb_flush (gdb_stdout);
3478 case TARGET_SIGNAL_0:
3479 case TARGET_SIGNAL_DEFAULT:
3480 case TARGET_SIGNAL_UNKNOWN:
3481 /* Make sure that "all" doesn't print these. */
3492 target_notice_signals (inferior_ptid);
3496 /* Show the results. */
3497 sig_print_header ();
3498 for (signum = 0; signum < nsigs; signum++)
3502 sig_print_info (signum);
3507 do_cleanups (old_chain);
3511 xdb_handle_command (char *args, int from_tty)
3514 struct cleanup *old_chain;
3516 /* Break the command line up into args. */
3518 argv = buildargv (args);
3523 old_chain = make_cleanup_freeargv (argv);
3524 if (argv[1] != (char *) NULL)
3529 bufLen = strlen (argv[0]) + 20;
3530 argBuf = (char *) xmalloc (bufLen);
3534 enum target_signal oursig;
3536 oursig = target_signal_from_name (argv[0]);
3537 memset (argBuf, 0, bufLen);
3538 if (strcmp (argv[1], "Q") == 0)
3539 sprintf (argBuf, "%s %s", argv[0], "noprint");
3542 if (strcmp (argv[1], "s") == 0)
3544 if (!signal_stop[oursig])
3545 sprintf (argBuf, "%s %s", argv[0], "stop");
3547 sprintf (argBuf, "%s %s", argv[0], "nostop");
3549 else if (strcmp (argv[1], "i") == 0)
3551 if (!signal_program[oursig])
3552 sprintf (argBuf, "%s %s", argv[0], "pass");
3554 sprintf (argBuf, "%s %s", argv[0], "nopass");
3556 else if (strcmp (argv[1], "r") == 0)
3558 if (!signal_print[oursig])
3559 sprintf (argBuf, "%s %s", argv[0], "print");
3561 sprintf (argBuf, "%s %s", argv[0], "noprint");
3567 handle_command (argBuf, from_tty);
3569 printf_filtered (_("Invalid signal handling flag.\n"));
3574 do_cleanups (old_chain);
3577 /* Print current contents of the tables set by the handle command.
3578 It is possible we should just be printing signals actually used
3579 by the current target (but for things to work right when switching
3580 targets, all signals should be in the signal tables). */
3583 signals_info (char *signum_exp, int from_tty)
3585 enum target_signal oursig;
3586 sig_print_header ();
3590 /* First see if this is a symbol name. */
3591 oursig = target_signal_from_name (signum_exp);
3592 if (oursig == TARGET_SIGNAL_UNKNOWN)
3594 /* No, try numeric. */
3596 target_signal_from_command (parse_and_eval_long (signum_exp));
3598 sig_print_info (oursig);
3602 printf_filtered ("\n");
3603 /* These ugly casts brought to you by the native VAX compiler. */
3604 for (oursig = TARGET_SIGNAL_FIRST;
3605 (int) oursig < (int) TARGET_SIGNAL_LAST;
3606 oursig = (enum target_signal) ((int) oursig + 1))
3610 if (oursig != TARGET_SIGNAL_UNKNOWN
3611 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3612 sig_print_info (oursig);
3615 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3618 struct inferior_status
3620 enum target_signal stop_signal;
3624 int stop_stack_dummy;
3625 int stopped_by_random_signal;
3627 CORE_ADDR step_range_start;
3628 CORE_ADDR step_range_end;
3629 struct frame_id step_frame_id;
3630 enum step_over_calls_kind step_over_calls;
3631 CORE_ADDR step_resume_break_address;
3632 int stop_after_trap;
3634 struct regcache *stop_registers;
3636 /* These are here because if call_function_by_hand has written some
3637 registers and then decides to call error(), we better not have changed
3639 struct regcache *registers;
3641 /* A frame unique identifier. */
3642 struct frame_id selected_frame_id;
3644 int breakpoint_proceeded;
3645 int restore_stack_info;
3646 int proceed_to_finish;
3650 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3653 int size = register_size (current_gdbarch, regno);
3654 void *buf = alloca (size);
3655 store_signed_integer (buf, size, val);
3656 regcache_raw_write (inf_status->registers, regno, buf);
3659 /* Save all of the information associated with the inferior<==>gdb
3660 connection. INF_STATUS is a pointer to a "struct inferior_status"
3661 (defined in inferior.h). */
3663 struct inferior_status *
3664 save_inferior_status (int restore_stack_info)
3666 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3668 inf_status->stop_signal = stop_signal;
3669 inf_status->stop_pc = stop_pc;
3670 inf_status->stop_step = stop_step;
3671 inf_status->stop_stack_dummy = stop_stack_dummy;
3672 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3673 inf_status->trap_expected = trap_expected;
3674 inf_status->step_range_start = step_range_start;
3675 inf_status->step_range_end = step_range_end;
3676 inf_status->step_frame_id = step_frame_id;
3677 inf_status->step_over_calls = step_over_calls;
3678 inf_status->stop_after_trap = stop_after_trap;
3679 inf_status->stop_soon = stop_soon;
3680 /* Save original bpstat chain here; replace it with copy of chain.
3681 If caller's caller is walking the chain, they'll be happier if we
3682 hand them back the original chain when restore_inferior_status is
3684 inf_status->stop_bpstat = stop_bpstat;
3685 stop_bpstat = bpstat_copy (stop_bpstat);
3686 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3687 inf_status->restore_stack_info = restore_stack_info;
3688 inf_status->proceed_to_finish = proceed_to_finish;
3690 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3692 inf_status->registers = regcache_dup (current_regcache);
3694 inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL));
3699 restore_selected_frame (void *args)
3701 struct frame_id *fid = (struct frame_id *) args;
3702 struct frame_info *frame;
3704 frame = frame_find_by_id (*fid);
3706 /* If inf_status->selected_frame_id is NULL, there was no previously
3710 warning (_("Unable to restore previously selected frame."));
3714 select_frame (frame);
3720 restore_inferior_status (struct inferior_status *inf_status)
3722 stop_signal = inf_status->stop_signal;
3723 stop_pc = inf_status->stop_pc;
3724 stop_step = inf_status->stop_step;
3725 stop_stack_dummy = inf_status->stop_stack_dummy;
3726 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3727 trap_expected = inf_status->trap_expected;
3728 step_range_start = inf_status->step_range_start;
3729 step_range_end = inf_status->step_range_end;
3730 step_frame_id = inf_status->step_frame_id;
3731 step_over_calls = inf_status->step_over_calls;
3732 stop_after_trap = inf_status->stop_after_trap;
3733 stop_soon = inf_status->stop_soon;
3734 bpstat_clear (&stop_bpstat);
3735 stop_bpstat = inf_status->stop_bpstat;
3736 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3737 proceed_to_finish = inf_status->proceed_to_finish;
3739 /* FIXME: Is the restore of stop_registers always needed. */
3740 regcache_xfree (stop_registers);
3741 stop_registers = inf_status->stop_registers;
3743 /* The inferior can be gone if the user types "print exit(0)"
3744 (and perhaps other times). */
3745 if (target_has_execution)
3746 /* NB: The register write goes through to the target. */
3747 regcache_cpy (current_regcache, inf_status->registers);
3748 regcache_xfree (inf_status->registers);
3750 /* FIXME: If we are being called after stopping in a function which
3751 is called from gdb, we should not be trying to restore the
3752 selected frame; it just prints a spurious error message (The
3753 message is useful, however, in detecting bugs in gdb (like if gdb
3754 clobbers the stack)). In fact, should we be restoring the
3755 inferior status at all in that case? . */
3757 if (target_has_stack && inf_status->restore_stack_info)
3759 /* The point of catch_errors is that if the stack is clobbered,
3760 walking the stack might encounter a garbage pointer and
3761 error() trying to dereference it. */
3763 (restore_selected_frame, &inf_status->selected_frame_id,
3764 "Unable to restore previously selected frame:\n",
3765 RETURN_MASK_ERROR) == 0)
3766 /* Error in restoring the selected frame. Select the innermost
3768 select_frame (get_current_frame ());
3776 do_restore_inferior_status_cleanup (void *sts)
3778 restore_inferior_status (sts);
3782 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3784 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3788 discard_inferior_status (struct inferior_status *inf_status)
3790 /* See save_inferior_status for info on stop_bpstat. */
3791 bpstat_clear (&inf_status->stop_bpstat);
3792 regcache_xfree (inf_status->registers);
3793 regcache_xfree (inf_status->stop_registers);
3798 inferior_has_forked (int pid, int *child_pid)
3800 struct target_waitstatus last;
3803 get_last_target_status (&last_ptid, &last);
3805 if (last.kind != TARGET_WAITKIND_FORKED)
3808 if (ptid_get_pid (last_ptid) != pid)
3811 *child_pid = last.value.related_pid;
3816 inferior_has_vforked (int pid, int *child_pid)
3818 struct target_waitstatus last;
3821 get_last_target_status (&last_ptid, &last);
3823 if (last.kind != TARGET_WAITKIND_VFORKED)
3826 if (ptid_get_pid (last_ptid) != pid)
3829 *child_pid = last.value.related_pid;
3834 inferior_has_execd (int pid, char **execd_pathname)
3836 struct target_waitstatus last;
3839 get_last_target_status (&last_ptid, &last);
3841 if (last.kind != TARGET_WAITKIND_EXECD)
3844 if (ptid_get_pid (last_ptid) != pid)
3847 *execd_pathname = xstrdup (last.value.execd_pathname);
3851 /* Oft used ptids */
3853 ptid_t minus_one_ptid;
3855 /* Create a ptid given the necessary PID, LWP, and TID components. */
3858 ptid_build (int pid, long lwp, long tid)
3868 /* Create a ptid from just a pid. */
3871 pid_to_ptid (int pid)
3873 return ptid_build (pid, 0, 0);
3876 /* Fetch the pid (process id) component from a ptid. */
3879 ptid_get_pid (ptid_t ptid)
3884 /* Fetch the lwp (lightweight process) component from a ptid. */
3887 ptid_get_lwp (ptid_t ptid)
3892 /* Fetch the tid (thread id) component from a ptid. */
3895 ptid_get_tid (ptid_t ptid)
3900 /* ptid_equal() is used to test equality of two ptids. */
3903 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3905 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3906 && ptid1.tid == ptid2.tid);
3909 /* restore_inferior_ptid() will be used by the cleanup machinery
3910 to restore the inferior_ptid value saved in a call to
3911 save_inferior_ptid(). */
3914 restore_inferior_ptid (void *arg)
3916 ptid_t *saved_ptid_ptr = arg;
3917 inferior_ptid = *saved_ptid_ptr;
3921 /* Save the value of inferior_ptid so that it may be restored by a
3922 later call to do_cleanups(). Returns the struct cleanup pointer
3923 needed for later doing the cleanup. */
3926 save_inferior_ptid (void)
3928 ptid_t *saved_ptid_ptr;
3930 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3931 *saved_ptid_ptr = inferior_ptid;
3932 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3939 stop_registers = regcache_xmalloc (current_gdbarch);
3943 _initialize_infrun (void)
3947 struct cmd_list_element *c;
3949 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers);
3950 deprecated_register_gdbarch_swap (NULL, 0, build_infrun);
3952 add_info ("signals", signals_info, _("\
3953 What debugger does when program gets various signals.\n\
3954 Specify a signal as argument to print info on that signal only."));
3955 add_info_alias ("handle", "signals", 0);
3957 add_com ("handle", class_run, handle_command, _("\
3958 Specify how to handle a signal.\n\
3959 Args are signals and actions to apply to those signals.\n\
3960 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3961 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3962 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3963 The special arg \"all\" is recognized to mean all signals except those\n\
3964 used by the debugger, typically SIGTRAP and SIGINT.\n\
3965 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3966 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3967 Stop means reenter debugger if this signal happens (implies print).\n\
3968 Print means print a message if this signal happens.\n\
3969 Pass means let program see this signal; otherwise program doesn't know.\n\
3970 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3971 Pass and Stop may be combined."));
3974 add_com ("lz", class_info, signals_info, _("\
3975 What debugger does when program gets various signals.\n\
3976 Specify a signal as argument to print info on that signal only."));
3977 add_com ("z", class_run, xdb_handle_command, _("\
3978 Specify how to handle a signal.\n\
3979 Args are signals and actions to apply to those signals.\n\
3980 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3981 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3982 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3983 The special arg \"all\" is recognized to mean all signals except those\n\
3984 used by the debugger, typically SIGTRAP and SIGINT.\n\
3985 Recognized actions include \"s\" (toggles between stop and nostop), \n\
3986 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3987 nopass), \"Q\" (noprint)\n\
3988 Stop means reenter debugger if this signal happens (implies print).\n\
3989 Print means print a message if this signal happens.\n\
3990 Pass means let program see this signal; otherwise program doesn't know.\n\
3991 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3992 Pass and Stop may be combined."));
3996 stop_command = add_cmd ("stop", class_obscure,
3997 not_just_help_class_command, _("\
3998 There is no `stop' command, but you can set a hook on `stop'.\n\
3999 This allows you to set a list of commands to be run each time execution\n\
4000 of the program stops."), &cmdlist);
4002 add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\
4003 Set inferior debugging."), _("\
4004 Show inferior debugging."), _("\
4005 When non-zero, inferior specific debugging is enabled."),
4008 &setdebuglist, &showdebuglist);
4010 numsigs = (int) TARGET_SIGNAL_LAST;
4011 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
4012 signal_print = (unsigned char *)
4013 xmalloc (sizeof (signal_print[0]) * numsigs);
4014 signal_program = (unsigned char *)
4015 xmalloc (sizeof (signal_program[0]) * numsigs);
4016 for (i = 0; i < numsigs; i++)
4019 signal_print[i] = 1;
4020 signal_program[i] = 1;
4023 /* Signals caused by debugger's own actions
4024 should not be given to the program afterwards. */
4025 signal_program[TARGET_SIGNAL_TRAP] = 0;
4026 signal_program[TARGET_SIGNAL_INT] = 0;
4028 /* Signals that are not errors should not normally enter the debugger. */
4029 signal_stop[TARGET_SIGNAL_ALRM] = 0;
4030 signal_print[TARGET_SIGNAL_ALRM] = 0;
4031 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
4032 signal_print[TARGET_SIGNAL_VTALRM] = 0;
4033 signal_stop[TARGET_SIGNAL_PROF] = 0;
4034 signal_print[TARGET_SIGNAL_PROF] = 0;
4035 signal_stop[TARGET_SIGNAL_CHLD] = 0;
4036 signal_print[TARGET_SIGNAL_CHLD] = 0;
4037 signal_stop[TARGET_SIGNAL_IO] = 0;
4038 signal_print[TARGET_SIGNAL_IO] = 0;
4039 signal_stop[TARGET_SIGNAL_POLL] = 0;
4040 signal_print[TARGET_SIGNAL_POLL] = 0;
4041 signal_stop[TARGET_SIGNAL_URG] = 0;
4042 signal_print[TARGET_SIGNAL_URG] = 0;
4043 signal_stop[TARGET_SIGNAL_WINCH] = 0;
4044 signal_print[TARGET_SIGNAL_WINCH] = 0;
4046 /* These signals are used internally by user-level thread
4047 implementations. (See signal(5) on Solaris.) Like the above
4048 signals, a healthy program receives and handles them as part of
4049 its normal operation. */
4050 signal_stop[TARGET_SIGNAL_LWP] = 0;
4051 signal_print[TARGET_SIGNAL_LWP] = 0;
4052 signal_stop[TARGET_SIGNAL_WAITING] = 0;
4053 signal_print[TARGET_SIGNAL_WAITING] = 0;
4054 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4055 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4057 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support,
4058 &stop_on_solib_events, _("\
4059 Set stopping for shared library events."), _("\
4060 Show stopping for shared library events."), _("\
4061 If nonzero, gdb will give control to the user when the dynamic linker\n\
4062 notifies gdb of shared library events. The most common event of interest\n\
4063 to the user would be loading/unloading of a new library."),
4065 show_stop_on_solib_events,
4066 &setlist, &showlist);
4068 add_setshow_enum_cmd ("follow-fork-mode", class_run,
4069 follow_fork_mode_kind_names,
4070 &follow_fork_mode_string, _("\
4071 Set debugger response to a program call of fork or vfork."), _("\
4072 Show debugger response to a program call of fork or vfork."), _("\
4073 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4074 parent - the original process is debugged after a fork\n\
4075 child - the new process is debugged after a fork\n\
4076 The unfollowed process will continue to run.\n\
4077 By default, the debugger will follow the parent process."),
4079 show_follow_fork_mode_string,
4080 &setlist, &showlist);
4082 add_setshow_enum_cmd ("scheduler-locking", class_run,
4083 scheduler_enums, &scheduler_mode, _("\
4084 Set mode for locking scheduler during execution."), _("\
4085 Show mode for locking scheduler during execution."), _("\
4086 off == no locking (threads may preempt at any time)\n\
4087 on == full locking (no thread except the current thread may run)\n\
4088 step == scheduler locked during every single-step operation.\n\
4089 In this mode, no other thread may run during a step command.\n\
4090 Other threads may run while stepping over a function call ('next')."),
4091 set_schedlock_func, /* traps on target vector */
4092 show_scheduler_mode,
4093 &setlist, &showlist);
4095 add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\
4096 Set mode of the step operation."), _("\
4097 Show mode of the step operation."), _("\
4098 When set, doing a step over a function without debug line information\n\
4099 will stop at the first instruction of that function. Otherwise, the\n\
4100 function is skipped and the step command stops at a different source line."),
4102 show_step_stop_if_no_debug,
4103 &setlist, &showlist);
4105 /* ptid initializations */
4106 null_ptid = ptid_build (0, 0, 0);
4107 minus_one_ptid = ptid_build (-1, 0, 0);
4108 inferior_ptid = null_ptid;
4109 target_last_wait_ptid = minus_one_ptid;