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 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "gdb_string.h"
29 #include "exceptions.h"
30 #include "breakpoint.h"
34 #include "cli/cli-script.h"
36 #include "gdbthread.h"
49 #include "gdb_assert.h"
50 #include "mi/mi-common.h"
52 /* Prototypes for local functions */
54 static void signals_info (char *, int);
56 static void handle_command (char *, int);
58 static void sig_print_info (enum target_signal);
60 static void sig_print_header (void);
62 static void resume_cleanups (void *);
64 static int hook_stop_stub (void *);
66 static int restore_selected_frame (void *);
68 static void build_infrun (void);
70 static int follow_fork (void);
72 static void set_schedlock_func (char *args, int from_tty,
73 struct cmd_list_element *c);
75 struct execution_control_state;
77 static int currently_stepping (struct execution_control_state *ecs);
79 static void xdb_handle_command (char *args, int from_tty);
81 static int prepare_to_proceed (int);
83 void _initialize_infrun (void);
85 int inferior_ignoring_leading_exec_events = 0;
87 /* When set, stop the 'step' command if we enter a function which has
88 no line number information. The normal behavior is that we step
89 over such function. */
90 int step_stop_if_no_debug = 0;
92 show_step_stop_if_no_debug (struct ui_file *file, int from_tty,
93 struct cmd_list_element *c, const char *value)
95 fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value);
98 /* In asynchronous mode, but simulating synchronous execution. */
100 int sync_execution = 0;
102 /* wait_for_inferior and normal_stop use this to notify the user
103 when the inferior stopped in a different thread than it had been
106 static ptid_t previous_inferior_ptid;
108 /* This is true for configurations that may follow through execl() and
109 similar functions. At present this is only true for HP-UX native. */
111 #ifndef MAY_FOLLOW_EXEC
112 #define MAY_FOLLOW_EXEC (0)
115 static int may_follow_exec = MAY_FOLLOW_EXEC;
117 static int debug_infrun = 0;
119 show_debug_infrun (struct ui_file *file, int from_tty,
120 struct cmd_list_element *c, const char *value)
122 fprintf_filtered (file, _("Inferior debugging is %s.\n"), value);
125 /* If the program uses ELF-style shared libraries, then calls to
126 functions in shared libraries go through stubs, which live in a
127 table called the PLT (Procedure Linkage Table). The first time the
128 function is called, the stub sends control to the dynamic linker,
129 which looks up the function's real address, patches the stub so
130 that future calls will go directly to the function, and then passes
131 control to the function.
133 If we are stepping at the source level, we don't want to see any of
134 this --- we just want to skip over the stub and the dynamic linker.
135 The simple approach is to single-step until control leaves the
138 However, on some systems (e.g., Red Hat's 5.2 distribution) the
139 dynamic linker calls functions in the shared C library, so you
140 can't tell from the PC alone whether the dynamic linker is still
141 running. In this case, we use a step-resume breakpoint to get us
142 past the dynamic linker, as if we were using "next" to step over a
145 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
146 linker code or not. Normally, this means we single-step. However,
147 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
148 address where we can place a step-resume breakpoint to get past the
149 linker's symbol resolution function.
151 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
152 pretty portable way, by comparing the PC against the address ranges
153 of the dynamic linker's sections.
155 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
156 it depends on internal details of the dynamic linker. It's usually
157 not too hard to figure out where to put a breakpoint, but it
158 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
159 sanity checking. If it can't figure things out, returning zero and
160 getting the (possibly confusing) stepping behavior is better than
161 signalling an error, which will obscure the change in the
164 /* This function returns TRUE if pc is the address of an instruction
165 that lies within the dynamic linker (such as the event hook, or the
168 This function must be used only when a dynamic linker event has
169 been caught, and the inferior is being stepped out of the hook, or
170 undefined results are guaranteed. */
172 #ifndef SOLIB_IN_DYNAMIC_LINKER
173 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
177 /* Convert the #defines into values. This is temporary until wfi control
178 flow is completely sorted out. */
180 #ifndef CANNOT_STEP_HW_WATCHPOINTS
181 #define CANNOT_STEP_HW_WATCHPOINTS 0
183 #undef CANNOT_STEP_HW_WATCHPOINTS
184 #define CANNOT_STEP_HW_WATCHPOINTS 1
187 /* Tables of how to react to signals; the user sets them. */
189 static unsigned char *signal_stop;
190 static unsigned char *signal_print;
191 static unsigned char *signal_program;
193 #define SET_SIGS(nsigs,sigs,flags) \
195 int signum = (nsigs); \
196 while (signum-- > 0) \
197 if ((sigs)[signum]) \
198 (flags)[signum] = 1; \
201 #define UNSET_SIGS(nsigs,sigs,flags) \
203 int signum = (nsigs); \
204 while (signum-- > 0) \
205 if ((sigs)[signum]) \
206 (flags)[signum] = 0; \
209 /* Value to pass to target_resume() to cause all threads to resume */
211 #define RESUME_ALL (pid_to_ptid (-1))
213 /* Command list pointer for the "stop" placeholder. */
215 static struct cmd_list_element *stop_command;
217 /* Nonzero if breakpoints are now inserted in the inferior. */
219 static int breakpoints_inserted;
221 /* Function inferior was in as of last step command. */
223 static struct symbol *step_start_function;
225 /* Nonzero if we are expecting a trace trap and should proceed from it. */
227 static int trap_expected;
229 /* Nonzero if we want to give control to the user when we're notified
230 of shared library events by the dynamic linker. */
231 static int stop_on_solib_events;
233 show_stop_on_solib_events (struct ui_file *file, int from_tty,
234 struct cmd_list_element *c, const char *value)
236 fprintf_filtered (file, _("Stopping for shared library events is %s.\n"),
240 /* Nonzero means expecting a trace trap
241 and should stop the inferior and return silently when it happens. */
245 /* Nonzero means expecting a trap and caller will handle it themselves.
246 It is used after attach, due to attaching to a process;
247 when running in the shell before the child program has been exec'd;
248 and when running some kinds of remote stuff (FIXME?). */
250 enum stop_kind stop_soon;
252 /* Nonzero if proceed is being used for a "finish" command or a similar
253 situation when stop_registers should be saved. */
255 int proceed_to_finish;
257 /* Save register contents here when about to pop a stack dummy frame,
258 if-and-only-if proceed_to_finish is set.
259 Thus this contains the return value from the called function (assuming
260 values are returned in a register). */
262 struct regcache *stop_registers;
264 /* Nonzero after stop if current stack frame should be printed. */
266 static int stop_print_frame;
268 static struct breakpoint *step_resume_breakpoint = NULL;
270 /* This is a cached copy of the pid/waitstatus of the last event
271 returned by target_wait()/deprecated_target_wait_hook(). This
272 information is returned by get_last_target_status(). */
273 static ptid_t target_last_wait_ptid;
274 static struct target_waitstatus target_last_waitstatus;
276 /* This is used to remember when a fork, vfork or exec event
277 was caught by a catchpoint, and thus the event is to be
278 followed at the next resume of the inferior, and not
282 enum target_waitkind kind;
289 char *execd_pathname;
293 static const char follow_fork_mode_child[] = "child";
294 static const char follow_fork_mode_parent[] = "parent";
296 static const char *follow_fork_mode_kind_names[] = {
297 follow_fork_mode_child,
298 follow_fork_mode_parent,
302 static const char *follow_fork_mode_string = follow_fork_mode_parent;
304 show_follow_fork_mode_string (struct ui_file *file, int from_tty,
305 struct cmd_list_element *c, const char *value)
307 fprintf_filtered (file, _("\
308 Debugger response to a program call of fork or vfork is \"%s\".\n"),
316 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
318 return target_follow_fork (follow_child);
322 follow_inferior_reset_breakpoints (void)
324 /* Was there a step_resume breakpoint? (There was if the user
325 did a "next" at the fork() call.) If so, explicitly reset its
328 step_resumes are a form of bp that are made to be per-thread.
329 Since we created the step_resume bp when the parent process
330 was being debugged, and now are switching to the child process,
331 from the breakpoint package's viewpoint, that's a switch of
332 "threads". We must update the bp's notion of which thread
333 it is for, or it'll be ignored when it triggers. */
335 if (step_resume_breakpoint)
336 breakpoint_re_set_thread (step_resume_breakpoint);
338 /* Reinsert all breakpoints in the child. The user may have set
339 breakpoints after catching the fork, in which case those
340 were never set in the child, but only in the parent. This makes
341 sure the inserted breakpoints match the breakpoint list. */
343 breakpoint_re_set ();
344 insert_breakpoints ();
347 /* EXECD_PATHNAME is assumed to be non-NULL. */
350 follow_exec (int pid, char *execd_pathname)
353 struct target_ops *tgt;
355 if (!may_follow_exec)
358 /* This is an exec event that we actually wish to pay attention to.
359 Refresh our symbol table to the newly exec'd program, remove any
362 If there are breakpoints, they aren't really inserted now,
363 since the exec() transformed our inferior into a fresh set
366 We want to preserve symbolic breakpoints on the list, since
367 we have hopes that they can be reset after the new a.out's
368 symbol table is read.
370 However, any "raw" breakpoints must be removed from the list
371 (e.g., the solib bp's), since their address is probably invalid
374 And, we DON'T want to call delete_breakpoints() here, since
375 that may write the bp's "shadow contents" (the instruction
376 value that was overwritten witha TRAP instruction). Since
377 we now have a new a.out, those shadow contents aren't valid. */
378 update_breakpoints_after_exec ();
380 /* If there was one, it's gone now. We cannot truly step-to-next
381 statement through an exec(). */
382 step_resume_breakpoint = NULL;
383 step_range_start = 0;
386 /* What is this a.out's name? */
387 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname);
389 /* We've followed the inferior through an exec. Therefore, the
390 inferior has essentially been killed & reborn. */
392 /* First collect the run target in effect. */
393 tgt = find_run_target ();
394 /* If we can't find one, things are in a very strange state... */
396 error (_("Could find run target to save before following exec"));
398 gdb_flush (gdb_stdout);
399 target_mourn_inferior ();
400 inferior_ptid = pid_to_ptid (saved_pid);
401 /* Because mourn_inferior resets inferior_ptid. */
404 /* That a.out is now the one to use. */
405 exec_file_attach (execd_pathname, 0);
407 /* And also is where symbols can be found. */
408 symbol_file_add_main (execd_pathname, 0);
410 /* Reset the shared library package. This ensures that we get
411 a shlib event when the child reaches "_start", at which point
412 the dld will have had a chance to initialize the child. */
413 #if defined(SOLIB_RESTART)
416 #ifdef SOLIB_CREATE_INFERIOR_HOOK
417 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
419 solib_create_inferior_hook ();
422 /* Reinsert all breakpoints. (Those which were symbolic have
423 been reset to the proper address in the new a.out, thanks
424 to symbol_file_command...) */
425 insert_breakpoints ();
427 /* The next resume of this inferior should bring it to the shlib
428 startup breakpoints. (If the user had also set bp's on
429 "main" from the old (parent) process, then they'll auto-
430 matically get reset there in the new process.) */
433 /* Non-zero if we just simulating a single-step. This is needed
434 because we cannot remove the breakpoints in the inferior process
435 until after the `wait' in `wait_for_inferior'. */
436 static int singlestep_breakpoints_inserted_p = 0;
438 /* The thread we inserted single-step breakpoints for. */
439 static ptid_t singlestep_ptid;
441 /* PC when we started this single-step. */
442 static CORE_ADDR singlestep_pc;
444 /* If another thread hit the singlestep breakpoint, we save the original
445 thread here so that we can resume single-stepping it later. */
446 static ptid_t saved_singlestep_ptid;
447 static int stepping_past_singlestep_breakpoint;
449 /* Similarly, if we are stepping another thread past a breakpoint,
450 save the original thread here so that we can resume stepping it later. */
451 static ptid_t stepping_past_breakpoint_ptid;
452 static int stepping_past_breakpoint;
455 /* Things to clean up if we QUIT out of resume (). */
457 resume_cleanups (void *ignore)
462 static const char schedlock_off[] = "off";
463 static const char schedlock_on[] = "on";
464 static const char schedlock_step[] = "step";
465 static const char *scheduler_enums[] = {
471 static const char *scheduler_mode = schedlock_off;
473 show_scheduler_mode (struct ui_file *file, int from_tty,
474 struct cmd_list_element *c, const char *value)
476 fprintf_filtered (file, _("\
477 Mode for locking scheduler during execution is \"%s\".\n"),
482 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
484 if (!target_can_lock_scheduler)
486 scheduler_mode = schedlock_off;
487 error (_("Target '%s' cannot support this command."), target_shortname);
492 /* Resume the inferior, but allow a QUIT. This is useful if the user
493 wants to interrupt some lengthy single-stepping operation
494 (for child processes, the SIGINT goes to the inferior, and so
495 we get a SIGINT random_signal, but for remote debugging and perhaps
496 other targets, that's not true).
498 STEP nonzero if we should step (zero to continue instead).
499 SIG is the signal to give the inferior (zero for none). */
501 resume (int step, enum target_signal sig)
503 int should_resume = 1;
504 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
508 fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n",
511 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
514 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
515 over an instruction that causes a page fault without triggering
516 a hardware watchpoint. The kernel properly notices that it shouldn't
517 stop, because the hardware watchpoint is not triggered, but it forgets
518 the step request and continues the program normally.
519 Work around the problem by removing hardware watchpoints if a step is
520 requested, GDB will check for a hardware watchpoint trigger after the
522 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
523 remove_hw_watchpoints ();
526 /* Normally, by the time we reach `resume', the breakpoints are either
527 removed or inserted, as appropriate. The exception is if we're sitting
528 at a permanent breakpoint; we need to step over it, but permanent
529 breakpoints can't be removed. So we have to test for it here. */
530 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
532 if (gdbarch_skip_permanent_breakpoint_p (current_gdbarch))
533 gdbarch_skip_permanent_breakpoint (current_gdbarch,
534 get_current_regcache ());
537 The program is stopped at a permanent breakpoint, but GDB does not know\n\
538 how to step past a permanent breakpoint on this architecture. Try using\n\
539 a command like `return' or `jump' to continue execution."));
542 if (step && gdbarch_software_single_step_p (current_gdbarch))
544 /* Do it the hard way, w/temp breakpoints */
545 if (gdbarch_software_single_step (current_gdbarch, get_current_frame ()))
547 /* ...and don't ask hardware to do it. */
549 /* and do not pull these breakpoints until after a `wait' in
550 `wait_for_inferior' */
551 singlestep_breakpoints_inserted_p = 1;
552 singlestep_ptid = inferior_ptid;
553 singlestep_pc = read_pc ();
557 /* If there were any forks/vforks/execs that were caught and are
558 now to be followed, then do so. */
559 switch (pending_follow.kind)
561 case TARGET_WAITKIND_FORKED:
562 case TARGET_WAITKIND_VFORKED:
563 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
568 case TARGET_WAITKIND_EXECD:
569 /* follow_exec is called as soon as the exec event is seen. */
570 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
577 /* Install inferior's terminal modes. */
578 target_terminal_inferior ();
584 resume_ptid = RESUME_ALL; /* Default */
586 if ((step || singlestep_breakpoints_inserted_p)
587 && (stepping_past_singlestep_breakpoint
588 || (!breakpoints_inserted && breakpoint_here_p (read_pc ()))))
590 /* Stepping past a breakpoint without inserting breakpoints.
591 Make sure only the current thread gets to step, so that
592 other threads don't sneak past breakpoints while they are
595 resume_ptid = inferior_ptid;
598 if ((scheduler_mode == schedlock_on)
599 || (scheduler_mode == schedlock_step
600 && (step || singlestep_breakpoints_inserted_p)))
602 /* User-settable 'scheduler' mode requires solo thread resume. */
603 resume_ptid = inferior_ptid;
606 if (gdbarch_cannot_step_breakpoint (current_gdbarch))
608 /* Most targets can step a breakpoint instruction, thus
609 executing it normally. But if this one cannot, just
610 continue and we will hit it anyway. */
611 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
614 target_resume (resume_ptid, step, sig);
617 discard_cleanups (old_cleanups);
621 /* Clear out all variables saying what to do when inferior is continued.
622 First do this, then set the ones you want, then call `proceed'. */
625 clear_proceed_status (void)
628 step_range_start = 0;
630 step_frame_id = null_frame_id;
631 step_over_calls = STEP_OVER_UNDEBUGGABLE;
633 stop_soon = NO_STOP_QUIETLY;
634 proceed_to_finish = 0;
635 breakpoint_proceeded = 1; /* We're about to proceed... */
639 regcache_xfree (stop_registers);
640 stop_registers = NULL;
643 /* Discard any remaining commands or status from previous stop. */
644 bpstat_clear (&stop_bpstat);
647 /* This should be suitable for any targets that support threads. */
650 prepare_to_proceed (int step)
653 struct target_waitstatus wait_status;
655 /* Get the last target status returned by target_wait(). */
656 get_last_target_status (&wait_ptid, &wait_status);
658 /* Make sure we were stopped at a breakpoint. */
659 if (wait_status.kind != TARGET_WAITKIND_STOPPED
660 || wait_status.value.sig != TARGET_SIGNAL_TRAP)
665 /* Switched over from WAIT_PID. */
666 if (!ptid_equal (wait_ptid, minus_one_ptid)
667 && !ptid_equal (inferior_ptid, wait_ptid)
668 && breakpoint_here_p (read_pc_pid (wait_ptid)))
670 /* If stepping, remember current thread to switch back to. */
673 stepping_past_breakpoint = 1;
674 stepping_past_breakpoint_ptid = inferior_ptid;
677 /* Switch back to WAIT_PID thread. */
678 switch_to_thread (wait_ptid);
680 /* We return 1 to indicate that there is a breakpoint here,
681 so we need to step over it before continuing to avoid
682 hitting it straight away. */
689 /* Record the pc of the program the last time it stopped. This is
690 just used internally by wait_for_inferior, but need to be preserved
691 over calls to it and cleared when the inferior is started. */
692 static CORE_ADDR prev_pc;
694 /* Basic routine for continuing the program in various fashions.
696 ADDR is the address to resume at, or -1 for resume where stopped.
697 SIGGNAL is the signal to give it, or 0 for none,
698 or -1 for act according to how it stopped.
699 STEP is nonzero if should trap after one instruction.
700 -1 means return after that and print nothing.
701 You should probably set various step_... variables
702 before calling here, if you are stepping.
704 You should call clear_proceed_status before calling proceed. */
707 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
712 step_start_function = find_pc_function (read_pc ());
716 if (addr == (CORE_ADDR) -1)
718 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
719 /* There is a breakpoint at the address we will resume at,
720 step one instruction before inserting breakpoints so that
721 we do not stop right away (and report a second hit at this
724 else if (gdbarch_single_step_through_delay_p (current_gdbarch)
725 && gdbarch_single_step_through_delay (current_gdbarch,
726 get_current_frame ()))
727 /* We stepped onto an instruction that needs to be stepped
728 again before re-inserting the breakpoint, do so. */
737 fprintf_unfiltered (gdb_stdlog,
738 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
739 paddr_nz (addr), siggnal, step);
741 /* In a multi-threaded task we may select another thread
742 and then continue or step.
744 But if the old thread was stopped at a breakpoint, it
745 will immediately cause another breakpoint stop without
746 any execution (i.e. it will report a breakpoint hit
747 incorrectly). So we must step over it first.
749 prepare_to_proceed checks the current thread against the thread
750 that reported the most recent event. If a step-over is required
751 it returns TRUE and sets the current thread to the old thread. */
752 if (prepare_to_proceed (step))
756 /* We will get a trace trap after one instruction.
757 Continue it automatically and insert breakpoints then. */
761 insert_breakpoints ();
762 /* If we get here there was no call to error() in
763 insert breakpoints -- so they were inserted. */
764 breakpoints_inserted = 1;
767 if (siggnal != TARGET_SIGNAL_DEFAULT)
768 stop_signal = siggnal;
769 /* If this signal should not be seen by program,
770 give it zero. Used for debugging signals. */
771 else if (!signal_program[stop_signal])
772 stop_signal = TARGET_SIGNAL_0;
774 annotate_starting ();
776 /* Make sure that output from GDB appears before output from the
778 gdb_flush (gdb_stdout);
780 /* Refresh prev_pc value just prior to resuming. This used to be
781 done in stop_stepping, however, setting prev_pc there did not handle
782 scenarios such as inferior function calls or returning from
783 a function via the return command. In those cases, the prev_pc
784 value was not set properly for subsequent commands. The prev_pc value
785 is used to initialize the starting line number in the ecs. With an
786 invalid value, the gdb next command ends up stopping at the position
787 represented by the next line table entry past our start position.
788 On platforms that generate one line table entry per line, this
789 is not a problem. However, on the ia64, the compiler generates
790 extraneous line table entries that do not increase the line number.
791 When we issue the gdb next command on the ia64 after an inferior call
792 or a return command, we often end up a few instructions forward, still
793 within the original line we started.
795 An attempt was made to have init_execution_control_state () refresh
796 the prev_pc value before calculating the line number. This approach
797 did not work because on platforms that use ptrace, the pc register
798 cannot be read unless the inferior is stopped. At that point, we
799 are not guaranteed the inferior is stopped and so the read_pc ()
800 call can fail. Setting the prev_pc value here ensures the value is
801 updated correctly when the inferior is stopped. */
802 prev_pc = read_pc ();
804 /* Resume inferior. */
805 resume (oneproc || step || bpstat_should_step (), stop_signal);
807 /* Wait for it to stop (if not standalone)
808 and in any case decode why it stopped, and act accordingly. */
809 /* Do this only if we are not using the event loop, or if the target
810 does not support asynchronous execution. */
811 if (!target_can_async_p ())
813 wait_for_inferior ();
819 /* Start remote-debugging of a machine over a serial link. */
822 start_remote (int from_tty)
825 init_wait_for_inferior ();
826 stop_soon = STOP_QUIETLY_REMOTE;
829 /* Always go on waiting for the target, regardless of the mode. */
830 /* FIXME: cagney/1999-09-23: At present it isn't possible to
831 indicate to wait_for_inferior that a target should timeout if
832 nothing is returned (instead of just blocking). Because of this,
833 targets expecting an immediate response need to, internally, set
834 things up so that the target_wait() is forced to eventually
836 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
837 differentiate to its caller what the state of the target is after
838 the initial open has been performed. Here we're assuming that
839 the target has stopped. It should be possible to eventually have
840 target_open() return to the caller an indication that the target
841 is currently running and GDB state should be set to the same as
843 wait_for_inferior ();
845 /* Now that the inferior has stopped, do any bookkeeping like
846 loading shared libraries. We want to do this before normal_stop,
847 so that the displayed frame is up to date. */
848 post_create_inferior (¤t_target, from_tty);
853 /* Initialize static vars when a new inferior begins. */
856 init_wait_for_inferior (void)
858 /* These are meaningless until the first time through wait_for_inferior. */
861 breakpoints_inserted = 0;
862 breakpoint_init_inferior (inf_starting);
864 /* Don't confuse first call to proceed(). */
865 stop_signal = TARGET_SIGNAL_0;
867 /* The first resume is not following a fork/vfork/exec. */
868 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
870 clear_proceed_status ();
872 stepping_past_singlestep_breakpoint = 0;
873 stepping_past_breakpoint = 0;
876 /* This enum encodes possible reasons for doing a target_wait, so that
877 wfi can call target_wait in one place. (Ultimately the call will be
878 moved out of the infinite loop entirely.) */
882 infwait_normal_state,
883 infwait_thread_hop_state,
884 infwait_nonstep_watch_state
887 /* Why did the inferior stop? Used to print the appropriate messages
888 to the interface from within handle_inferior_event(). */
889 enum inferior_stop_reason
891 /* Step, next, nexti, stepi finished. */
893 /* Inferior terminated by signal. */
895 /* Inferior exited. */
897 /* Inferior received signal, and user asked to be notified. */
901 /* This structure contains what used to be local variables in
902 wait_for_inferior. Probably many of them can return to being
903 locals in handle_inferior_event. */
905 struct execution_control_state
907 struct target_waitstatus ws;
908 struct target_waitstatus *wp;
911 CORE_ADDR stop_func_start;
912 CORE_ADDR stop_func_end;
913 char *stop_func_name;
914 struct symtab_and_line sal;
916 struct symtab *current_symtab;
917 int handling_longjmp; /* FIXME */
919 ptid_t saved_inferior_ptid;
920 int step_after_step_resume_breakpoint;
921 int stepping_through_solib_after_catch;
922 bpstat stepping_through_solib_catchpoints;
923 int new_thread_event;
924 struct target_waitstatus tmpstatus;
925 enum infwait_states infwait_state;
930 void init_execution_control_state (struct execution_control_state *ecs);
932 void handle_inferior_event (struct execution_control_state *ecs);
934 static void step_into_function (struct execution_control_state *ecs);
935 static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame);
936 static void insert_step_resume_breakpoint_at_caller (struct frame_info *);
937 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
938 struct frame_id sr_id);
939 static void stop_stepping (struct execution_control_state *ecs);
940 static void prepare_to_wait (struct execution_control_state *ecs);
941 static void keep_going (struct execution_control_state *ecs);
942 static void print_stop_reason (enum inferior_stop_reason stop_reason,
945 /* Wait for control to return from inferior to debugger.
946 If inferior gets a signal, we may decide to start it up again
947 instead of returning. That is why there is a loop in this function.
948 When this function actually returns it means the inferior
949 should be left stopped and GDB should read more commands. */
952 wait_for_inferior (void)
954 struct cleanup *old_cleanups;
955 struct execution_control_state ecss;
956 struct execution_control_state *ecs;
959 fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n");
961 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
962 &step_resume_breakpoint);
964 /* wfi still stays in a loop, so it's OK just to take the address of
965 a local to get the ecs pointer. */
968 /* Fill in with reasonable starting values. */
969 init_execution_control_state (ecs);
971 /* We'll update this if & when we switch to a new thread. */
972 previous_inferior_ptid = inferior_ptid;
974 overlay_cache_invalid = 1;
976 /* We have to invalidate the registers BEFORE calling target_wait
977 because they can be loaded from the target while in target_wait.
978 This makes remote debugging a bit more efficient for those
979 targets that provide critical registers as part of their normal
982 registers_changed ();
986 if (deprecated_target_wait_hook)
987 ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
989 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
991 /* Now figure out what to do with the result of the result. */
992 handle_inferior_event (ecs);
994 if (!ecs->wait_some_more)
997 do_cleanups (old_cleanups);
1000 /* Asynchronous version of wait_for_inferior. It is called by the
1001 event loop whenever a change of state is detected on the file
1002 descriptor corresponding to the target. It can be called more than
1003 once to complete a single execution command. In such cases we need
1004 to keep the state in a global variable ASYNC_ECSS. If it is the
1005 last time that this function is called for a single execution
1006 command, then report to the user that the inferior has stopped, and
1007 do the necessary cleanups. */
1009 struct execution_control_state async_ecss;
1010 struct execution_control_state *async_ecs;
1013 fetch_inferior_event (void *client_data)
1015 static struct cleanup *old_cleanups;
1017 async_ecs = &async_ecss;
1019 if (!async_ecs->wait_some_more)
1021 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1022 &step_resume_breakpoint);
1024 /* Fill in with reasonable starting values. */
1025 init_execution_control_state (async_ecs);
1027 /* We'll update this if & when we switch to a new thread. */
1028 previous_inferior_ptid = inferior_ptid;
1030 overlay_cache_invalid = 1;
1032 /* We have to invalidate the registers BEFORE calling target_wait
1033 because they can be loaded from the target while in target_wait.
1034 This makes remote debugging a bit more efficient for those
1035 targets that provide critical registers as part of their normal
1036 status mechanism. */
1038 registers_changed ();
1041 if (deprecated_target_wait_hook)
1043 deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1045 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1047 /* Now figure out what to do with the result of the result. */
1048 handle_inferior_event (async_ecs);
1050 if (!async_ecs->wait_some_more)
1052 /* Do only the cleanups that have been added by this
1053 function. Let the continuations for the commands do the rest,
1054 if there are any. */
1055 do_exec_cleanups (old_cleanups);
1057 if (step_multi && stop_step)
1058 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1060 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1064 /* Prepare an execution control state for looping through a
1065 wait_for_inferior-type loop. */
1068 init_execution_control_state (struct execution_control_state *ecs)
1070 ecs->another_trap = 0;
1071 ecs->random_signal = 0;
1072 ecs->step_after_step_resume_breakpoint = 0;
1073 ecs->handling_longjmp = 0; /* FIXME */
1074 ecs->stepping_through_solib_after_catch = 0;
1075 ecs->stepping_through_solib_catchpoints = NULL;
1076 ecs->sal = find_pc_line (prev_pc, 0);
1077 ecs->current_line = ecs->sal.line;
1078 ecs->current_symtab = ecs->sal.symtab;
1079 ecs->infwait_state = infwait_normal_state;
1080 ecs->waiton_ptid = pid_to_ptid (-1);
1081 ecs->wp = &(ecs->ws);
1084 /* Return the cached copy of the last pid/waitstatus returned by
1085 target_wait()/deprecated_target_wait_hook(). The data is actually
1086 cached by handle_inferior_event(), which gets called immediately
1087 after target_wait()/deprecated_target_wait_hook(). */
1090 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1092 *ptidp = target_last_wait_ptid;
1093 *status = target_last_waitstatus;
1097 nullify_last_target_wait_ptid (void)
1099 target_last_wait_ptid = minus_one_ptid;
1102 /* Switch thread contexts, maintaining "infrun state". */
1105 context_switch (struct execution_control_state *ecs)
1107 /* Caution: it may happen that the new thread (or the old one!)
1108 is not in the thread list. In this case we must not attempt
1109 to "switch context", or we run the risk that our context may
1110 be lost. This may happen as a result of the target module
1111 mishandling thread creation. */
1115 fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ",
1116 target_pid_to_str (inferior_ptid));
1117 fprintf_unfiltered (gdb_stdlog, "to %s\n",
1118 target_pid_to_str (ecs->ptid));
1121 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1122 { /* Perform infrun state context switch: */
1123 /* Save infrun state for the old thread. */
1124 save_infrun_state (inferior_ptid, prev_pc,
1125 trap_expected, step_resume_breakpoint,
1127 step_range_end, &step_frame_id,
1128 ecs->handling_longjmp, ecs->another_trap,
1129 ecs->stepping_through_solib_after_catch,
1130 ecs->stepping_through_solib_catchpoints,
1131 ecs->current_line, ecs->current_symtab);
1133 /* Load infrun state for the new thread. */
1134 load_infrun_state (ecs->ptid, &prev_pc,
1135 &trap_expected, &step_resume_breakpoint,
1137 &step_range_end, &step_frame_id,
1138 &ecs->handling_longjmp, &ecs->another_trap,
1139 &ecs->stepping_through_solib_after_catch,
1140 &ecs->stepping_through_solib_catchpoints,
1141 &ecs->current_line, &ecs->current_symtab);
1144 switch_to_thread (ecs->ptid);
1148 adjust_pc_after_break (struct execution_control_state *ecs)
1150 CORE_ADDR breakpoint_pc;
1152 /* If this target does not decrement the PC after breakpoints, then
1153 we have nothing to do. */
1154 if (gdbarch_decr_pc_after_break (current_gdbarch) == 0)
1157 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1158 we aren't, just return.
1160 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1161 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1162 implemented by software breakpoints should be handled through the normal
1165 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1166 different signals (SIGILL or SIGEMT for instance), but it is less
1167 clear where the PC is pointing afterwards. It may not match
1168 gdbarch_decr_pc_after_break. I don't know any specific target that
1169 generates these signals at breakpoints (the code has been in GDB since at
1170 least 1992) so I can not guess how to handle them here.
1172 In earlier versions of GDB, a target with
1173 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
1174 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
1175 target with both of these set in GDB history, and it seems unlikely to be
1176 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
1178 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1181 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1184 /* Find the location where (if we've hit a breakpoint) the
1185 breakpoint would be. */
1186 breakpoint_pc = read_pc_pid (ecs->ptid) - gdbarch_decr_pc_after_break
1189 /* Check whether there actually is a software breakpoint inserted
1190 at that location. */
1191 if (software_breakpoint_inserted_here_p (breakpoint_pc))
1193 /* When using hardware single-step, a SIGTRAP is reported for both
1194 a completed single-step and a software breakpoint. Need to
1195 differentiate between the two, as the latter needs adjusting
1196 but the former does not.
1198 The SIGTRAP can be due to a completed hardware single-step only if
1199 - we didn't insert software single-step breakpoints
1200 - the thread to be examined is still the current thread
1201 - this thread is currently being stepped
1203 If any of these events did not occur, we must have stopped due
1204 to hitting a software breakpoint, and have to back up to the
1207 As a special case, we could have hardware single-stepped a
1208 software breakpoint. In this case (prev_pc == breakpoint_pc),
1209 we also need to back up to the breakpoint address. */
1211 if (singlestep_breakpoints_inserted_p
1212 || !ptid_equal (ecs->ptid, inferior_ptid)
1213 || !currently_stepping (ecs)
1214 || prev_pc == breakpoint_pc)
1215 write_pc_pid (breakpoint_pc, ecs->ptid);
1219 /* Given an execution control state that has been freshly filled in
1220 by an event from the inferior, figure out what it means and take
1221 appropriate action. */
1223 int stepped_after_stopped_by_watchpoint;
1226 handle_inferior_event (struct execution_control_state *ecs)
1228 /* NOTE: bje/2005-05-02: If you're looking at this code and thinking
1229 that the variable stepped_after_stopped_by_watchpoint isn't used,
1230 then you're wrong! See remote.c:remote_stopped_data_address. */
1232 int sw_single_step_trap_p = 0;
1233 int stopped_by_watchpoint = -1; /* Mark as unknown. */
1235 /* Cache the last pid/waitstatus. */
1236 target_last_wait_ptid = ecs->ptid;
1237 target_last_waitstatus = *ecs->wp;
1239 adjust_pc_after_break (ecs);
1241 switch (ecs->infwait_state)
1243 case infwait_thread_hop_state:
1245 fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n");
1246 /* Cancel the waiton_ptid. */
1247 ecs->waiton_ptid = pid_to_ptid (-1);
1250 case infwait_normal_state:
1252 fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n");
1253 stepped_after_stopped_by_watchpoint = 0;
1256 case infwait_nonstep_watch_state:
1258 fprintf_unfiltered (gdb_stdlog,
1259 "infrun: infwait_nonstep_watch_state\n");
1260 insert_breakpoints ();
1262 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1263 handle things like signals arriving and other things happening
1264 in combination correctly? */
1265 stepped_after_stopped_by_watchpoint = 1;
1269 internal_error (__FILE__, __LINE__, _("bad switch"));
1271 ecs->infwait_state = infwait_normal_state;
1273 reinit_frame_cache ();
1275 /* If it's a new process, add it to the thread database */
1277 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1278 && !ptid_equal (ecs->ptid, minus_one_ptid)
1279 && !in_thread_list (ecs->ptid));
1281 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1282 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1284 add_thread (ecs->ptid);
1286 ui_out_text (uiout, "[New ");
1287 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1288 ui_out_text (uiout, "]\n");
1291 switch (ecs->ws.kind)
1293 case TARGET_WAITKIND_LOADED:
1295 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n");
1296 /* Ignore gracefully during startup of the inferior, as it might
1297 be the shell which has just loaded some objects, otherwise
1298 add the symbols for the newly loaded objects. Also ignore at
1299 the beginning of an attach or remote session; we will query
1300 the full list of libraries once the connection is
1302 if (stop_soon == NO_STOP_QUIETLY)
1304 int breakpoints_were_inserted;
1306 /* Remove breakpoints, SOLIB_ADD might adjust
1307 breakpoint addresses via breakpoint_re_set. */
1308 breakpoints_were_inserted = breakpoints_inserted;
1309 if (breakpoints_inserted)
1310 remove_breakpoints ();
1311 breakpoints_inserted = 0;
1313 /* Check for any newly added shared libraries if we're
1314 supposed to be adding them automatically. Switch
1315 terminal for any messages produced by
1316 breakpoint_re_set. */
1317 target_terminal_ours_for_output ();
1318 /* NOTE: cagney/2003-11-25: Make certain that the target
1319 stack's section table is kept up-to-date. Architectures,
1320 (e.g., PPC64), use the section table to perform
1321 operations such as address => section name and hence
1322 require the table to contain all sections (including
1323 those found in shared libraries). */
1324 /* NOTE: cagney/2003-11-25: Pass current_target and not
1325 exec_ops to SOLIB_ADD. This is because current GDB is
1326 only tooled to propagate section_table changes out from
1327 the "current_target" (see target_resize_to_sections), and
1328 not up from the exec stratum. This, of course, isn't
1329 right. "infrun.c" should only interact with the
1330 exec/process stratum, instead relying on the target stack
1331 to propagate relevant changes (stop, section table
1332 changed, ...) up to other layers. */
1334 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1336 solib_add (NULL, 0, ¤t_target, auto_solib_add);
1338 target_terminal_inferior ();
1340 /* If requested, stop when the dynamic linker notifies
1341 gdb of events. This allows the user to get control
1342 and place breakpoints in initializer routines for
1343 dynamically loaded objects (among other things). */
1344 if (stop_on_solib_events)
1346 stop_stepping (ecs);
1350 /* NOTE drow/2007-05-11: This might be a good place to check
1351 for "catch load". */
1353 /* Reinsert breakpoints and continue. */
1354 if (breakpoints_were_inserted)
1356 insert_breakpoints ();
1357 breakpoints_inserted = 1;
1361 /* If we are skipping through a shell, or through shared library
1362 loading that we aren't interested in, resume the program. If
1363 we're running the program normally, also resume. But stop if
1364 we're attaching or setting up a remote connection. */
1365 if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY)
1367 resume (0, TARGET_SIGNAL_0);
1368 prepare_to_wait (ecs);
1374 case TARGET_WAITKIND_SPURIOUS:
1376 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1377 resume (0, TARGET_SIGNAL_0);
1378 prepare_to_wait (ecs);
1381 case TARGET_WAITKIND_EXITED:
1383 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n");
1384 target_terminal_ours (); /* Must do this before mourn anyway */
1385 print_stop_reason (EXITED, ecs->ws.value.integer);
1387 /* Record the exit code in the convenience variable $_exitcode, so
1388 that the user can inspect this again later. */
1389 set_internalvar (lookup_internalvar ("_exitcode"),
1390 value_from_longest (builtin_type_int,
1391 (LONGEST) ecs->ws.value.integer));
1392 gdb_flush (gdb_stdout);
1393 target_mourn_inferior ();
1394 singlestep_breakpoints_inserted_p = 0;
1395 stop_print_frame = 0;
1396 stop_stepping (ecs);
1399 case TARGET_WAITKIND_SIGNALLED:
1401 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1402 stop_print_frame = 0;
1403 stop_signal = ecs->ws.value.sig;
1404 target_terminal_ours (); /* Must do this before mourn anyway */
1406 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1407 reach here unless the inferior is dead. However, for years
1408 target_kill() was called here, which hints that fatal signals aren't
1409 really fatal on some systems. If that's true, then some changes
1411 target_mourn_inferior ();
1413 print_stop_reason (SIGNAL_EXITED, stop_signal);
1414 singlestep_breakpoints_inserted_p = 0;
1415 stop_stepping (ecs);
1418 /* The following are the only cases in which we keep going;
1419 the above cases end in a continue or goto. */
1420 case TARGET_WAITKIND_FORKED:
1421 case TARGET_WAITKIND_VFORKED:
1423 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n");
1424 stop_signal = TARGET_SIGNAL_TRAP;
1425 pending_follow.kind = ecs->ws.kind;
1427 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1428 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1430 if (!ptid_equal (ecs->ptid, inferior_ptid))
1432 context_switch (ecs);
1433 reinit_frame_cache ();
1436 stop_pc = read_pc ();
1438 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1440 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1442 /* If no catchpoint triggered for this, then keep going. */
1443 if (ecs->random_signal)
1445 stop_signal = TARGET_SIGNAL_0;
1449 goto process_event_stop_test;
1451 case TARGET_WAITKIND_EXECD:
1453 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n");
1454 stop_signal = TARGET_SIGNAL_TRAP;
1456 /* NOTE drow/2002-12-05: This code should be pushed down into the
1457 target_wait function. Until then following vfork on HP/UX 10.20
1458 is probably broken by this. Of course, it's broken anyway. */
1459 /* Is this a target which reports multiple exec events per actual
1460 call to exec()? (HP-UX using ptrace does, for example.) If so,
1461 ignore all but the last one. Just resume the exec'r, and wait
1462 for the next exec event. */
1463 if (inferior_ignoring_leading_exec_events)
1465 inferior_ignoring_leading_exec_events--;
1466 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1467 prepare_to_wait (ecs);
1470 inferior_ignoring_leading_exec_events =
1471 target_reported_exec_events_per_exec_call () - 1;
1473 pending_follow.execd_pathname =
1474 savestring (ecs->ws.value.execd_pathname,
1475 strlen (ecs->ws.value.execd_pathname));
1477 /* This causes the eventpoints and symbol table to be reset. Must
1478 do this now, before trying to determine whether to stop. */
1479 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1480 xfree (pending_follow.execd_pathname);
1482 stop_pc = read_pc_pid (ecs->ptid);
1483 ecs->saved_inferior_ptid = inferior_ptid;
1484 inferior_ptid = ecs->ptid;
1486 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1488 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1489 inferior_ptid = ecs->saved_inferior_ptid;
1491 if (!ptid_equal (ecs->ptid, inferior_ptid))
1493 context_switch (ecs);
1494 reinit_frame_cache ();
1497 /* If no catchpoint triggered for this, then keep going. */
1498 if (ecs->random_signal)
1500 stop_signal = TARGET_SIGNAL_0;
1504 goto process_event_stop_test;
1506 /* Be careful not to try to gather much state about a thread
1507 that's in a syscall. It's frequently a losing proposition. */
1508 case TARGET_WAITKIND_SYSCALL_ENTRY:
1510 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1511 resume (0, TARGET_SIGNAL_0);
1512 prepare_to_wait (ecs);
1515 /* Before examining the threads further, step this thread to
1516 get it entirely out of the syscall. (We get notice of the
1517 event when the thread is just on the verge of exiting a
1518 syscall. Stepping one instruction seems to get it back
1520 case TARGET_WAITKIND_SYSCALL_RETURN:
1522 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1523 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1524 prepare_to_wait (ecs);
1527 case TARGET_WAITKIND_STOPPED:
1529 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n");
1530 stop_signal = ecs->ws.value.sig;
1533 /* We had an event in the inferior, but we are not interested
1534 in handling it at this level. The lower layers have already
1535 done what needs to be done, if anything.
1537 One of the possible circumstances for this is when the
1538 inferior produces output for the console. The inferior has
1539 not stopped, and we are ignoring the event. Another possible
1540 circumstance is any event which the lower level knows will be
1541 reported multiple times without an intervening resume. */
1542 case TARGET_WAITKIND_IGNORE:
1544 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n");
1545 prepare_to_wait (ecs);
1549 /* We may want to consider not doing a resume here in order to give
1550 the user a chance to play with the new thread. It might be good
1551 to make that a user-settable option. */
1553 /* At this point, all threads are stopped (happens automatically in
1554 either the OS or the native code). Therefore we need to continue
1555 all threads in order to make progress. */
1556 if (ecs->new_thread_event)
1558 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1559 prepare_to_wait (ecs);
1563 stop_pc = read_pc_pid (ecs->ptid);
1566 fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc));
1568 if (stepping_past_singlestep_breakpoint)
1570 gdb_assert (singlestep_breakpoints_inserted_p);
1571 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1572 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1574 stepping_past_singlestep_breakpoint = 0;
1576 /* We've either finished single-stepping past the single-step
1577 breakpoint, or stopped for some other reason. It would be nice if
1578 we could tell, but we can't reliably. */
1579 if (stop_signal == TARGET_SIGNAL_TRAP)
1582 fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n");
1583 /* Pull the single step breakpoints out of the target. */
1584 remove_single_step_breakpoints ();
1585 singlestep_breakpoints_inserted_p = 0;
1587 ecs->random_signal = 0;
1589 ecs->ptid = saved_singlestep_ptid;
1590 context_switch (ecs);
1591 if (deprecated_context_hook)
1592 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1594 resume (1, TARGET_SIGNAL_0);
1595 prepare_to_wait (ecs);
1600 stepping_past_singlestep_breakpoint = 0;
1602 if (stepping_past_breakpoint)
1604 stepping_past_breakpoint = 0;
1606 /* If we stopped for some other reason than single-stepping, ignore
1607 the fact that we were supposed to switch back. */
1608 if (stop_signal == TARGET_SIGNAL_TRAP)
1611 fprintf_unfiltered (gdb_stdlog,
1612 "infrun: stepping_past_breakpoint\n");
1614 /* Pull the single step breakpoints out of the target. */
1615 if (singlestep_breakpoints_inserted_p)
1617 remove_single_step_breakpoints ();
1618 singlestep_breakpoints_inserted_p = 0;
1621 /* Note: We do not call context_switch at this point, as the
1622 context is already set up for stepping the original thread. */
1623 switch_to_thread (stepping_past_breakpoint_ptid);
1624 /* Suppress spurious "Switching to ..." message. */
1625 previous_inferior_ptid = inferior_ptid;
1627 resume (1, TARGET_SIGNAL_0);
1628 prepare_to_wait (ecs);
1633 /* See if a thread hit a thread-specific breakpoint that was meant for
1634 another thread. If so, then step that thread past the breakpoint,
1637 if (stop_signal == TARGET_SIGNAL_TRAP)
1639 int thread_hop_needed = 0;
1641 /* Check if a regular breakpoint has been hit before checking
1642 for a potential single step breakpoint. Otherwise, GDB will
1643 not see this breakpoint hit when stepping onto breakpoints. */
1644 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1646 ecs->random_signal = 0;
1647 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1648 thread_hop_needed = 1;
1650 else if (singlestep_breakpoints_inserted_p)
1652 /* We have not context switched yet, so this should be true
1653 no matter which thread hit the singlestep breakpoint. */
1654 gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid));
1656 fprintf_unfiltered (gdb_stdlog, "infrun: software single step "
1658 target_pid_to_str (ecs->ptid));
1660 ecs->random_signal = 0;
1661 /* The call to in_thread_list is necessary because PTIDs sometimes
1662 change when we go from single-threaded to multi-threaded. If
1663 the singlestep_ptid is still in the list, assume that it is
1664 really different from ecs->ptid. */
1665 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1666 && in_thread_list (singlestep_ptid))
1668 /* If the PC of the thread we were trying to single-step
1669 has changed, discard this event (which we were going
1670 to ignore anyway), and pretend we saw that thread
1671 trap. This prevents us continuously moving the
1672 single-step breakpoint forward, one instruction at a
1673 time. If the PC has changed, then the thread we were
1674 trying to single-step has trapped or been signalled,
1675 but the event has not been reported to GDB yet.
1677 There might be some cases where this loses signal
1678 information, if a signal has arrived at exactly the
1679 same time that the PC changed, but this is the best
1680 we can do with the information available. Perhaps we
1681 should arrange to report all events for all threads
1682 when they stop, or to re-poll the remote looking for
1683 this particular thread (i.e. temporarily enable
1685 if (read_pc_pid (singlestep_ptid) != singlestep_pc)
1688 fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread,"
1689 " but expected thread advanced also\n");
1691 /* The current context still belongs to
1692 singlestep_ptid. Don't swap here, since that's
1693 the context we want to use. Just fudge our
1694 state and continue. */
1695 ecs->ptid = singlestep_ptid;
1696 stop_pc = read_pc_pid (ecs->ptid);
1701 fprintf_unfiltered (gdb_stdlog,
1702 "infrun: unexpected thread\n");
1704 thread_hop_needed = 1;
1705 stepping_past_singlestep_breakpoint = 1;
1706 saved_singlestep_ptid = singlestep_ptid;
1711 if (thread_hop_needed)
1716 fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n");
1718 /* Saw a breakpoint, but it was hit by the wrong thread.
1721 if (singlestep_breakpoints_inserted_p)
1723 /* Pull the single step breakpoints out of the target. */
1724 remove_single_step_breakpoints ();
1725 singlestep_breakpoints_inserted_p = 0;
1728 remove_status = remove_breakpoints ();
1729 /* Did we fail to remove breakpoints? If so, try
1730 to set the PC past the bp. (There's at least
1731 one situation in which we can fail to remove
1732 the bp's: On HP-UX's that use ttrace, we can't
1733 change the address space of a vforking child
1734 process until the child exits (well, okay, not
1735 then either :-) or execs. */
1736 if (remove_status != 0)
1738 /* FIXME! This is obviously non-portable! */
1739 write_pc_pid (stop_pc + 4, ecs->ptid);
1740 /* We need to restart all the threads now,
1741 * unles we're running in scheduler-locked mode.
1742 * Use currently_stepping to determine whether to
1745 /* FIXME MVS: is there any reason not to call resume()? */
1746 if (scheduler_mode == schedlock_on)
1747 target_resume (ecs->ptid,
1748 currently_stepping (ecs), TARGET_SIGNAL_0);
1750 target_resume (RESUME_ALL,
1751 currently_stepping (ecs), TARGET_SIGNAL_0);
1752 prepare_to_wait (ecs);
1757 breakpoints_inserted = 0;
1758 if (!ptid_equal (inferior_ptid, ecs->ptid))
1759 context_switch (ecs);
1760 ecs->waiton_ptid = ecs->ptid;
1761 ecs->wp = &(ecs->ws);
1762 ecs->another_trap = 1;
1764 ecs->infwait_state = infwait_thread_hop_state;
1766 registers_changed ();
1770 else if (singlestep_breakpoints_inserted_p)
1772 sw_single_step_trap_p = 1;
1773 ecs->random_signal = 0;
1777 ecs->random_signal = 1;
1779 /* See if something interesting happened to the non-current thread. If
1780 so, then switch to that thread. */
1781 if (!ptid_equal (ecs->ptid, inferior_ptid))
1784 fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n");
1786 context_switch (ecs);
1788 if (deprecated_context_hook)
1789 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1792 if (singlestep_breakpoints_inserted_p)
1794 /* Pull the single step breakpoints out of the target. */
1795 remove_single_step_breakpoints ();
1796 singlestep_breakpoints_inserted_p = 0;
1799 /* It may not be necessary to disable the watchpoint to stop over
1800 it. For example, the PA can (with some kernel cooperation)
1801 single step over a watchpoint without disabling the watchpoint. */
1802 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1805 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1807 prepare_to_wait (ecs);
1811 /* It is far more common to need to disable a watchpoint to step
1812 the inferior over it. FIXME. What else might a debug
1813 register or page protection watchpoint scheme need here? */
1814 if (gdbarch_have_nonsteppable_watchpoint (current_gdbarch)
1815 && STOPPED_BY_WATCHPOINT (ecs->ws))
1817 /* At this point, we are stopped at an instruction which has
1818 attempted to write to a piece of memory under control of
1819 a watchpoint. The instruction hasn't actually executed
1820 yet. If we were to evaluate the watchpoint expression
1821 now, we would get the old value, and therefore no change
1822 would seem to have occurred.
1824 In order to make watchpoints work `right', we really need
1825 to complete the memory write, and then evaluate the
1826 watchpoint expression. The following code does that by
1827 removing the watchpoint (actually, all watchpoints and
1828 breakpoints), single-stepping the target, re-inserting
1829 watchpoints, and then falling through to let normal
1830 single-step processing handle proceed. Since this
1831 includes evaluating watchpoints, things will come to a
1832 stop in the correct manner. */
1835 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1836 remove_breakpoints ();
1837 registers_changed ();
1838 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1840 ecs->waiton_ptid = ecs->ptid;
1841 ecs->wp = &(ecs->ws);
1842 ecs->infwait_state = infwait_nonstep_watch_state;
1843 prepare_to_wait (ecs);
1847 /* It may be possible to simply continue after a watchpoint. */
1848 if (HAVE_CONTINUABLE_WATCHPOINT)
1849 stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws);
1851 ecs->stop_func_start = 0;
1852 ecs->stop_func_end = 0;
1853 ecs->stop_func_name = 0;
1854 /* Don't care about return value; stop_func_start and stop_func_name
1855 will both be 0 if it doesn't work. */
1856 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1857 &ecs->stop_func_start, &ecs->stop_func_end);
1858 ecs->stop_func_start
1859 += gdbarch_deprecated_function_start_offset (current_gdbarch);
1860 ecs->another_trap = 0;
1861 bpstat_clear (&stop_bpstat);
1863 stop_stack_dummy = 0;
1864 stop_print_frame = 1;
1865 ecs->random_signal = 0;
1866 stopped_by_random_signal = 0;
1868 if (stop_signal == TARGET_SIGNAL_TRAP
1870 && gdbarch_single_step_through_delay_p (current_gdbarch)
1871 && currently_stepping (ecs))
1873 /* We're trying to step of a breakpoint. Turns out that we're
1874 also on an instruction that needs to be stepped multiple
1875 times before it's been fully executing. E.g., architectures
1876 with a delay slot. It needs to be stepped twice, once for
1877 the instruction and once for the delay slot. */
1878 int step_through_delay
1879 = gdbarch_single_step_through_delay (current_gdbarch,
1880 get_current_frame ());
1881 if (debug_infrun && step_through_delay)
1882 fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n");
1883 if (step_range_end == 0 && step_through_delay)
1885 /* The user issued a continue when stopped at a breakpoint.
1886 Set up for another trap and get out of here. */
1887 ecs->another_trap = 1;
1891 else if (step_through_delay)
1893 /* The user issued a step when stopped at a breakpoint.
1894 Maybe we should stop, maybe we should not - the delay
1895 slot *might* correspond to a line of source. In any
1896 case, don't decide that here, just set ecs->another_trap,
1897 making sure we single-step again before breakpoints are
1899 ecs->another_trap = 1;
1903 /* Look at the cause of the stop, and decide what to do.
1904 The alternatives are:
1905 1) break; to really stop and return to the debugger,
1906 2) drop through to start up again
1907 (set ecs->another_trap to 1 to single step once)
1908 3) set ecs->random_signal to 1, and the decision between 1 and 2
1909 will be made according to the signal handling tables. */
1911 /* First, distinguish signals caused by the debugger from signals
1912 that have to do with the program's own actions. Note that
1913 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1914 on the operating system version. Here we detect when a SIGILL or
1915 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1916 something similar for SIGSEGV, since a SIGSEGV will be generated
1917 when we're trying to execute a breakpoint instruction on a
1918 non-executable stack. This happens for call dummy breakpoints
1919 for architectures like SPARC that place call dummies on the
1922 if (stop_signal == TARGET_SIGNAL_TRAP
1923 || (breakpoints_inserted
1924 && (stop_signal == TARGET_SIGNAL_ILL
1925 || stop_signal == TARGET_SIGNAL_SEGV
1926 || stop_signal == TARGET_SIGNAL_EMT))
1927 || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP
1928 || stop_soon == STOP_QUIETLY_REMOTE)
1930 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1933 fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n");
1934 stop_print_frame = 0;
1935 stop_stepping (ecs);
1939 /* This is originated from start_remote(), start_inferior() and
1940 shared libraries hook functions. */
1941 if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE)
1944 fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
1945 stop_stepping (ecs);
1949 /* This originates from attach_command(). We need to overwrite
1950 the stop_signal here, because some kernels don't ignore a
1951 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1952 See more comments in inferior.h. */
1953 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1955 stop_stepping (ecs);
1956 if (stop_signal == TARGET_SIGNAL_STOP)
1957 stop_signal = TARGET_SIGNAL_0;
1961 /* Don't even think about breakpoints if just proceeded over a
1963 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1966 fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n");
1967 bpstat_clear (&stop_bpstat);
1971 /* See if there is a breakpoint at the current PC. */
1972 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid,
1973 stopped_by_watchpoint);
1975 /* Following in case break condition called a
1977 stop_print_frame = 1;
1980 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1981 at one stage in the past included checks for an inferior
1982 function call's call dummy's return breakpoint. The original
1983 comment, that went with the test, read:
1985 ``End of a stack dummy. Some systems (e.g. Sony news) give
1986 another signal besides SIGTRAP, so check here as well as
1989 If someone ever tries to get get call dummys on a
1990 non-executable stack to work (where the target would stop
1991 with something like a SIGSEGV), then those tests might need
1992 to be re-instated. Given, however, that the tests were only
1993 enabled when momentary breakpoints were not being used, I
1994 suspect that it won't be the case.
1996 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1997 be necessary for call dummies on a non-executable stack on
2000 if (stop_signal == TARGET_SIGNAL_TRAP)
2002 = !(bpstat_explains_signal (stop_bpstat)
2004 || (step_range_end && step_resume_breakpoint == NULL));
2007 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
2008 if (!ecs->random_signal)
2009 stop_signal = TARGET_SIGNAL_TRAP;
2013 /* When we reach this point, we've pretty much decided
2014 that the reason for stopping must've been a random
2015 (unexpected) signal. */
2018 ecs->random_signal = 1;
2020 process_event_stop_test:
2021 /* For the program's own signals, act according to
2022 the signal handling tables. */
2024 if (ecs->random_signal)
2026 /* Signal not for debugging purposes. */
2030 fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal);
2032 stopped_by_random_signal = 1;
2034 if (signal_print[stop_signal])
2037 target_terminal_ours_for_output ();
2038 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
2040 if (signal_stop[stop_signal])
2042 stop_stepping (ecs);
2045 /* If not going to stop, give terminal back
2046 if we took it away. */
2048 target_terminal_inferior ();
2050 /* Clear the signal if it should not be passed. */
2051 if (signal_program[stop_signal] == 0)
2052 stop_signal = TARGET_SIGNAL_0;
2054 if (prev_pc == read_pc ()
2055 && !breakpoints_inserted
2056 && breakpoint_here_p (read_pc ())
2057 && step_resume_breakpoint == NULL)
2059 /* We were just starting a new sequence, attempting to
2060 single-step off of a breakpoint and expecting a SIGTRAP.
2061 Intead this signal arrives. This signal will take us out
2062 of the stepping range so GDB needs to remember to, when
2063 the signal handler returns, resume stepping off that
2065 /* To simplify things, "continue" is forced to use the same
2066 code paths as single-step - set a breakpoint at the
2067 signal return address and then, once hit, step off that
2070 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2071 ecs->step_after_step_resume_breakpoint = 1;
2076 if (step_range_end != 0
2077 && stop_signal != TARGET_SIGNAL_0
2078 && stop_pc >= step_range_start && stop_pc < step_range_end
2079 && frame_id_eq (get_frame_id (get_current_frame ()),
2081 && step_resume_breakpoint == NULL)
2083 /* The inferior is about to take a signal that will take it
2084 out of the single step range. Set a breakpoint at the
2085 current PC (which is presumably where the signal handler
2086 will eventually return) and then allow the inferior to
2089 Note that this is only needed for a signal delivered
2090 while in the single-step range. Nested signals aren't a
2091 problem as they eventually all return. */
2092 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2097 /* Note: step_resume_breakpoint may be non-NULL. This occures
2098 when either there's a nested signal, or when there's a
2099 pending signal enabled just as the signal handler returns
2100 (leaving the inferior at the step-resume-breakpoint without
2101 actually executing it). Either way continue until the
2102 breakpoint is really hit. */
2107 /* Handle cases caused by hitting a breakpoint. */
2109 CORE_ADDR jmp_buf_pc;
2110 struct bpstat_what what;
2112 what = bpstat_what (stop_bpstat);
2114 if (what.call_dummy)
2116 stop_stack_dummy = 1;
2119 switch (what.main_action)
2121 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2122 /* If we hit the breakpoint at longjmp, disable it for the
2123 duration of this command. Then, install a temporary
2124 breakpoint at the target of the jmp_buf. */
2126 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2127 disable_longjmp_breakpoint ();
2128 remove_breakpoints ();
2129 breakpoints_inserted = 0;
2130 if (!gdbarch_get_longjmp_target_p (current_gdbarch)
2131 || !gdbarch_get_longjmp_target (current_gdbarch,
2132 get_current_frame (), &jmp_buf_pc))
2138 /* Need to blow away step-resume breakpoint, as it
2139 interferes with us */
2140 if (step_resume_breakpoint != NULL)
2142 delete_step_resume_breakpoint (&step_resume_breakpoint);
2145 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2146 ecs->handling_longjmp = 1; /* FIXME */
2150 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2151 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2153 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2154 remove_breakpoints ();
2155 breakpoints_inserted = 0;
2156 disable_longjmp_breakpoint ();
2157 ecs->handling_longjmp = 0; /* FIXME */
2158 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2160 /* else fallthrough */
2162 case BPSTAT_WHAT_SINGLE:
2164 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n");
2165 if (breakpoints_inserted)
2166 remove_breakpoints ();
2167 breakpoints_inserted = 0;
2168 ecs->another_trap = 1;
2169 /* Still need to check other stuff, at least the case
2170 where we are stepping and step out of the right range. */
2173 case BPSTAT_WHAT_STOP_NOISY:
2175 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2176 stop_print_frame = 1;
2178 /* We are about to nuke the step_resume_breakpointt via the
2179 cleanup chain, so no need to worry about it here. */
2181 stop_stepping (ecs);
2184 case BPSTAT_WHAT_STOP_SILENT:
2186 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2187 stop_print_frame = 0;
2189 /* We are about to nuke the step_resume_breakpoin via the
2190 cleanup chain, so no need to worry about it here. */
2192 stop_stepping (ecs);
2195 case BPSTAT_WHAT_STEP_RESUME:
2196 /* This proably demands a more elegant solution, but, yeah
2199 This function's use of the simple variable
2200 step_resume_breakpoint doesn't seem to accomodate
2201 simultaneously active step-resume bp's, although the
2202 breakpoint list certainly can.
2204 If we reach here and step_resume_breakpoint is already
2205 NULL, then apparently we have multiple active
2206 step-resume bp's. We'll just delete the breakpoint we
2207 stopped at, and carry on.
2209 Correction: what the code currently does is delete a
2210 step-resume bp, but it makes no effort to ensure that
2211 the one deleted is the one currently stopped at. MVS */
2214 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2216 if (step_resume_breakpoint == NULL)
2218 step_resume_breakpoint =
2219 bpstat_find_step_resume_breakpoint (stop_bpstat);
2221 delete_step_resume_breakpoint (&step_resume_breakpoint);
2222 if (ecs->step_after_step_resume_breakpoint)
2224 /* Back when the step-resume breakpoint was inserted, we
2225 were trying to single-step off a breakpoint. Go back
2227 ecs->step_after_step_resume_breakpoint = 0;
2228 remove_breakpoints ();
2229 breakpoints_inserted = 0;
2230 ecs->another_trap = 1;
2236 case BPSTAT_WHAT_CHECK_SHLIBS:
2237 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2240 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2241 /* Remove breakpoints, we eventually want to step over the
2242 shlib event breakpoint, and SOLIB_ADD might adjust
2243 breakpoint addresses via breakpoint_re_set. */
2244 if (breakpoints_inserted)
2245 remove_breakpoints ();
2246 breakpoints_inserted = 0;
2248 /* Check for any newly added shared libraries if we're
2249 supposed to be adding them automatically. Switch
2250 terminal for any messages produced by
2251 breakpoint_re_set. */
2252 target_terminal_ours_for_output ();
2253 /* NOTE: cagney/2003-11-25: Make certain that the target
2254 stack's section table is kept up-to-date. Architectures,
2255 (e.g., PPC64), use the section table to perform
2256 operations such as address => section name and hence
2257 require the table to contain all sections (including
2258 those found in shared libraries). */
2259 /* NOTE: cagney/2003-11-25: Pass current_target and not
2260 exec_ops to SOLIB_ADD. This is because current GDB is
2261 only tooled to propagate section_table changes out from
2262 the "current_target" (see target_resize_to_sections), and
2263 not up from the exec stratum. This, of course, isn't
2264 right. "infrun.c" should only interact with the
2265 exec/process stratum, instead relying on the target stack
2266 to propagate relevant changes (stop, section table
2267 changed, ...) up to other layers. */
2269 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2271 solib_add (NULL, 0, ¤t_target, auto_solib_add);
2273 target_terminal_inferior ();
2275 /* If requested, stop when the dynamic linker notifies
2276 gdb of events. This allows the user to get control
2277 and place breakpoints in initializer routines for
2278 dynamically loaded objects (among other things). */
2279 if (stop_on_solib_events || stop_stack_dummy)
2281 stop_stepping (ecs);
2285 /* If we stopped due to an explicit catchpoint, then the
2286 (see above) call to SOLIB_ADD pulled in any symbols
2287 from a newly-loaded library, if appropriate.
2289 We do want the inferior to stop, but not where it is
2290 now, which is in the dynamic linker callback. Rather,
2291 we would like it stop in the user's program, just after
2292 the call that caused this catchpoint to trigger. That
2293 gives the user a more useful vantage from which to
2294 examine their program's state. */
2295 else if (what.main_action
2296 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2298 /* ??rehrauer: If I could figure out how to get the
2299 right return PC from here, we could just set a temp
2300 breakpoint and resume. I'm not sure we can without
2301 cracking open the dld's shared libraries and sniffing
2302 their unwind tables and text/data ranges, and that's
2303 not a terribly portable notion.
2305 Until that time, we must step the inferior out of the
2306 dld callback, and also out of the dld itself (and any
2307 code or stubs in libdld.sl, such as "shl_load" and
2308 friends) until we reach non-dld code. At that point,
2309 we can stop stepping. */
2310 bpstat_get_triggered_catchpoints (stop_bpstat,
2312 stepping_through_solib_catchpoints);
2313 ecs->stepping_through_solib_after_catch = 1;
2315 /* Be sure to lift all breakpoints, so the inferior does
2316 actually step past this point... */
2317 ecs->another_trap = 1;
2322 /* We want to step over this breakpoint, then keep going. */
2323 ecs->another_trap = 1;
2329 case BPSTAT_WHAT_LAST:
2330 /* Not a real code, but listed here to shut up gcc -Wall. */
2332 case BPSTAT_WHAT_KEEP_CHECKING:
2337 /* We come here if we hit a breakpoint but should not
2338 stop for it. Possibly we also were stepping
2339 and should stop for that. So fall through and
2340 test for stepping. But, if not stepping,
2343 /* Are we stepping to get the inferior out of the dynamic linker's
2344 hook (and possibly the dld itself) after catching a shlib
2346 if (ecs->stepping_through_solib_after_catch)
2348 #if defined(SOLIB_ADD)
2349 /* Have we reached our destination? If not, keep going. */
2350 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2353 fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n");
2354 ecs->another_trap = 1;
2360 fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n");
2361 /* Else, stop and report the catchpoint(s) whose triggering
2362 caused us to begin stepping. */
2363 ecs->stepping_through_solib_after_catch = 0;
2364 bpstat_clear (&stop_bpstat);
2365 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2366 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2367 stop_print_frame = 1;
2368 stop_stepping (ecs);
2372 if (step_resume_breakpoint)
2375 fprintf_unfiltered (gdb_stdlog,
2376 "infrun: step-resume breakpoint is inserted\n");
2378 /* Having a step-resume breakpoint overrides anything
2379 else having to do with stepping commands until
2380 that breakpoint is reached. */
2385 if (step_range_end == 0)
2388 fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n");
2389 /* Likewise if we aren't even stepping. */
2394 /* If stepping through a line, keep going if still within it.
2396 Note that step_range_end is the address of the first instruction
2397 beyond the step range, and NOT the address of the last instruction
2399 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2402 fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n",
2403 paddr_nz (step_range_start),
2404 paddr_nz (step_range_end));
2409 /* We stepped out of the stepping range. */
2411 /* If we are stepping at the source level and entered the runtime
2412 loader dynamic symbol resolution code, we keep on single stepping
2413 until we exit the run time loader code and reach the callee's
2415 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2416 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2417 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)
2419 && in_solib_dynsym_resolve_code (stop_pc)
2423 CORE_ADDR pc_after_resolver =
2424 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2427 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n");
2429 if (pc_after_resolver)
2431 /* Set up a step-resume breakpoint at the address
2432 indicated by SKIP_SOLIB_RESOLVER. */
2433 struct symtab_and_line sr_sal;
2435 sr_sal.pc = pc_after_resolver;
2437 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2444 if (step_range_end != 1
2445 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2446 || step_over_calls == STEP_OVER_ALL)
2447 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2450 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n");
2451 /* The inferior, while doing a "step" or "next", has ended up in
2452 a signal trampoline (either by a signal being delivered or by
2453 the signal handler returning). Just single-step until the
2454 inferior leaves the trampoline (either by calling the handler
2460 /* Check for subroutine calls. The check for the current frame
2461 equalling the step ID is not necessary - the check of the
2462 previous frame's ID is sufficient - but it is a common case and
2463 cheaper than checking the previous frame's ID.
2465 NOTE: frame_id_eq will never report two invalid frame IDs as
2466 being equal, so to get into this block, both the current and
2467 previous frame must have valid frame IDs. */
2468 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id)
2469 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id))
2471 CORE_ADDR real_stop_pc;
2474 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n");
2476 if ((step_over_calls == STEP_OVER_NONE)
2477 || ((step_range_end == 1)
2478 && in_prologue (prev_pc, ecs->stop_func_start)))
2480 /* I presume that step_over_calls is only 0 when we're
2481 supposed to be stepping at the assembly language level
2482 ("stepi"). Just stop. */
2483 /* Also, maybe we just did a "nexti" inside a prolog, so we
2484 thought it was a subroutine call but it was not. Stop as
2487 print_stop_reason (END_STEPPING_RANGE, 0);
2488 stop_stepping (ecs);
2492 if (step_over_calls == STEP_OVER_ALL)
2494 /* We're doing a "next", set a breakpoint at callee's return
2495 address (the address at which the caller will
2497 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2502 /* If we are in a function call trampoline (a stub between the
2503 calling routine and the real function), locate the real
2504 function. That's what tells us (a) whether we want to step
2505 into it at all, and (b) what prologue we want to run to the
2506 end of, if we do step into it. */
2507 real_stop_pc = skip_language_trampoline (get_current_frame (), stop_pc);
2508 if (real_stop_pc == 0)
2509 real_stop_pc = gdbarch_skip_trampoline_code
2510 (current_gdbarch, get_current_frame (), stop_pc);
2511 if (real_stop_pc != 0)
2512 ecs->stop_func_start = real_stop_pc;
2515 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2516 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)
2518 in_solib_dynsym_resolve_code (ecs->stop_func_start)
2522 struct symtab_and_line sr_sal;
2524 sr_sal.pc = ecs->stop_func_start;
2526 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2531 /* If we have line number information for the function we are
2532 thinking of stepping into, step into it.
2534 If there are several symtabs at that PC (e.g. with include
2535 files), just want to know whether *any* of them have line
2536 numbers. find_pc_line handles this. */
2538 struct symtab_and_line tmp_sal;
2540 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2541 if (tmp_sal.line != 0)
2543 step_into_function (ecs);
2548 /* If we have no line number and the step-stop-if-no-debug is
2549 set, we stop the step so that the user has a chance to switch
2550 in assembly mode. */
2551 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2554 print_stop_reason (END_STEPPING_RANGE, 0);
2555 stop_stepping (ecs);
2559 /* Set a breakpoint at callee's return address (the address at
2560 which the caller will resume). */
2561 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2566 /* If we're in the return path from a shared library trampoline,
2567 we want to proceed through the trampoline when stepping. */
2568 if (gdbarch_in_solib_return_trampoline (current_gdbarch,
2569 stop_pc, ecs->stop_func_name))
2571 /* Determine where this trampoline returns. */
2572 CORE_ADDR real_stop_pc;
2573 real_stop_pc = gdbarch_skip_trampoline_code
2574 (current_gdbarch, get_current_frame (), stop_pc);
2577 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n");
2579 /* Only proceed through if we know where it's going. */
2582 /* And put the step-breakpoint there and go until there. */
2583 struct symtab_and_line sr_sal;
2585 init_sal (&sr_sal); /* initialize to zeroes */
2586 sr_sal.pc = real_stop_pc;
2587 sr_sal.section = find_pc_overlay (sr_sal.pc);
2589 /* Do not specify what the fp should be when we stop since
2590 on some machines the prologue is where the new fp value
2592 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2594 /* Restart without fiddling with the step ranges or
2601 ecs->sal = find_pc_line (stop_pc, 0);
2603 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2604 the trampoline processing logic, however, there are some trampolines
2605 that have no names, so we should do trampoline handling first. */
2606 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2607 && ecs->stop_func_name == NULL
2608 && ecs->sal.line == 0)
2611 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n");
2613 /* The inferior just stepped into, or returned to, an
2614 undebuggable function (where there is no debugging information
2615 and no line number corresponding to the address where the
2616 inferior stopped). Since we want to skip this kind of code,
2617 we keep going until the inferior returns from this
2618 function - unless the user has asked us not to (via
2619 set step-mode) or we no longer know how to get back
2620 to the call site. */
2621 if (step_stop_if_no_debug
2622 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2624 /* If we have no line number and the step-stop-if-no-debug
2625 is set, we stop the step so that the user has a chance to
2626 switch in assembly mode. */
2628 print_stop_reason (END_STEPPING_RANGE, 0);
2629 stop_stepping (ecs);
2634 /* Set a breakpoint at callee's return address (the address
2635 at which the caller will resume). */
2636 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2642 if (step_range_end == 1)
2644 /* It is stepi or nexti. We always want to stop stepping after
2647 fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n");
2649 print_stop_reason (END_STEPPING_RANGE, 0);
2650 stop_stepping (ecs);
2654 if (ecs->sal.line == 0)
2656 /* We have no line number information. That means to stop
2657 stepping (does this always happen right after one instruction,
2658 when we do "s" in a function with no line numbers,
2659 or can this happen as a result of a return or longjmp?). */
2661 fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n");
2663 print_stop_reason (END_STEPPING_RANGE, 0);
2664 stop_stepping (ecs);
2668 if ((stop_pc == ecs->sal.pc)
2669 && (ecs->current_line != ecs->sal.line
2670 || ecs->current_symtab != ecs->sal.symtab))
2672 /* We are at the start of a different line. So stop. Note that
2673 we don't stop if we step into the middle of a different line.
2674 That is said to make things like for (;;) statements work
2677 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n");
2679 print_stop_reason (END_STEPPING_RANGE, 0);
2680 stop_stepping (ecs);
2684 /* We aren't done stepping.
2686 Optimize by setting the stepping range to the line.
2687 (We might not be in the original line, but if we entered a
2688 new line in mid-statement, we continue stepping. This makes
2689 things like for(;;) statements work better.) */
2691 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2693 /* If this is the last line of the function, don't keep stepping
2694 (it would probably step us out of the function).
2695 This is particularly necessary for a one-line function,
2696 in which after skipping the prologue we better stop even though
2697 we will be in mid-line. */
2699 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n");
2701 print_stop_reason (END_STEPPING_RANGE, 0);
2702 stop_stepping (ecs);
2705 step_range_start = ecs->sal.pc;
2706 step_range_end = ecs->sal.end;
2707 step_frame_id = get_frame_id (get_current_frame ());
2708 ecs->current_line = ecs->sal.line;
2709 ecs->current_symtab = ecs->sal.symtab;
2711 /* In the case where we just stepped out of a function into the
2712 middle of a line of the caller, continue stepping, but
2713 step_frame_id must be modified to current frame */
2715 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2716 generous. It will trigger on things like a step into a frameless
2717 stackless leaf function. I think the logic should instead look
2718 at the unwound frame ID has that should give a more robust
2719 indication of what happened. */
2720 if (step - ID == current - ID)
2721 still stepping in same function;
2722 else if (step - ID == unwind (current - ID))
2723 stepped into a function;
2725 stepped out of a function;
2726 /* Of course this assumes that the frame ID unwind code is robust
2727 and we're willing to introduce frame unwind logic into this
2728 function. Fortunately, those days are nearly upon us. */
2731 struct frame_id current_frame = get_frame_id (get_current_frame ());
2732 if (!(frame_id_inner (current_frame, step_frame_id)))
2733 step_frame_id = current_frame;
2737 fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n");
2741 /* Are we in the middle of stepping? */
2744 currently_stepping (struct execution_control_state *ecs)
2746 return ((!ecs->handling_longjmp
2747 && ((step_range_end && step_resume_breakpoint == NULL)
2749 || ecs->stepping_through_solib_after_catch
2750 || bpstat_should_step ());
2753 /* Subroutine call with source code we should not step over. Do step
2754 to the first line of code in it. */
2757 step_into_function (struct execution_control_state *ecs)
2760 struct symtab_and_line sr_sal;
2762 s = find_pc_symtab (stop_pc);
2763 if (s && s->language != language_asm)
2764 ecs->stop_func_start = gdbarch_skip_prologue
2765 (current_gdbarch, ecs->stop_func_start);
2767 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2768 /* Use the step_resume_break to step until the end of the prologue,
2769 even if that involves jumps (as it seems to on the vax under
2771 /* If the prologue ends in the middle of a source line, continue to
2772 the end of that source line (if it is still within the function).
2773 Otherwise, just go to end of prologue. */
2775 && ecs->sal.pc != ecs->stop_func_start
2776 && ecs->sal.end < ecs->stop_func_end)
2777 ecs->stop_func_start = ecs->sal.end;
2779 /* Architectures which require breakpoint adjustment might not be able
2780 to place a breakpoint at the computed address. If so, the test
2781 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2782 ecs->stop_func_start to an address at which a breakpoint may be
2783 legitimately placed.
2785 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2786 made, GDB will enter an infinite loop when stepping through
2787 optimized code consisting of VLIW instructions which contain
2788 subinstructions corresponding to different source lines. On
2789 FR-V, it's not permitted to place a breakpoint on any but the
2790 first subinstruction of a VLIW instruction. When a breakpoint is
2791 set, GDB will adjust the breakpoint address to the beginning of
2792 the VLIW instruction. Thus, we need to make the corresponding
2793 adjustment here when computing the stop address. */
2795 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2797 ecs->stop_func_start
2798 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2799 ecs->stop_func_start);
2802 if (ecs->stop_func_start == stop_pc)
2804 /* We are already there: stop now. */
2806 print_stop_reason (END_STEPPING_RANGE, 0);
2807 stop_stepping (ecs);
2812 /* Put the step-breakpoint there and go until there. */
2813 init_sal (&sr_sal); /* initialize to zeroes */
2814 sr_sal.pc = ecs->stop_func_start;
2815 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2817 /* Do not specify what the fp should be when we stop since on
2818 some machines the prologue is where the new fp value is
2820 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2822 /* And make sure stepping stops right away then. */
2823 step_range_end = step_range_start;
2828 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
2829 This is used to both functions and to skip over code. */
2832 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
2833 struct frame_id sr_id)
2835 /* There should never be more than one step-resume breakpoint per
2836 thread, so we should never be setting a new
2837 step_resume_breakpoint when one is already active. */
2838 gdb_assert (step_resume_breakpoint == NULL);
2841 fprintf_unfiltered (gdb_stdlog,
2842 "infrun: inserting step-resume breakpoint at 0x%s\n",
2843 paddr_nz (sr_sal.pc));
2845 step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id,
2847 if (breakpoints_inserted)
2848 insert_breakpoints ();
2851 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
2852 to skip a potential signal handler.
2854 This is called with the interrupted function's frame. The signal
2855 handler, when it returns, will resume the interrupted function at
2859 insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame)
2861 struct symtab_and_line sr_sal;
2863 gdb_assert (return_frame != NULL);
2864 init_sal (&sr_sal); /* initialize to zeros */
2866 sr_sal.pc = gdbarch_addr_bits_remove
2867 (current_gdbarch, get_frame_pc (return_frame));
2868 sr_sal.section = find_pc_overlay (sr_sal.pc);
2870 insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame));
2873 /* Similar to insert_step_resume_breakpoint_at_frame, except
2874 but a breakpoint at the previous frame's PC. This is used to
2875 skip a function after stepping into it (for "next" or if the called
2876 function has no debugging information).
2878 The current function has almost always been reached by single
2879 stepping a call or return instruction. NEXT_FRAME belongs to the
2880 current function, and the breakpoint will be set at the caller's
2883 This is a separate function rather than reusing
2884 insert_step_resume_breakpoint_at_frame in order to avoid
2885 get_prev_frame, which may stop prematurely (see the implementation
2886 of frame_unwind_id for an example). */
2889 insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame)
2891 struct symtab_and_line sr_sal;
2893 /* We shouldn't have gotten here if we don't know where the call site
2895 gdb_assert (frame_id_p (frame_unwind_id (next_frame)));
2897 init_sal (&sr_sal); /* initialize to zeros */
2899 sr_sal.pc = gdbarch_addr_bits_remove
2900 (current_gdbarch, frame_pc_unwind (next_frame));
2901 sr_sal.section = find_pc_overlay (sr_sal.pc);
2903 insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame));
2907 stop_stepping (struct execution_control_state *ecs)
2910 fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n");
2912 /* Let callers know we don't want to wait for the inferior anymore. */
2913 ecs->wait_some_more = 0;
2916 /* This function handles various cases where we need to continue
2917 waiting for the inferior. */
2918 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2921 keep_going (struct execution_control_state *ecs)
2923 /* Save the pc before execution, to compare with pc after stop. */
2924 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2926 /* If we did not do break;, it means we should keep running the
2927 inferior and not return to debugger. */
2929 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2931 /* We took a signal (which we are supposed to pass through to
2932 the inferior, else we'd have done a break above) and we
2933 haven't yet gotten our trap. Simply continue. */
2934 resume (currently_stepping (ecs), stop_signal);
2938 /* Either the trap was not expected, but we are continuing
2939 anyway (the user asked that this signal be passed to the
2942 The signal was SIGTRAP, e.g. it was our signal, but we
2943 decided we should resume from it.
2945 We're going to run this baby now! */
2947 if (!breakpoints_inserted && !ecs->another_trap)
2949 /* Stop stepping when inserting breakpoints
2951 if (insert_breakpoints () != 0)
2953 stop_stepping (ecs);
2956 breakpoints_inserted = 1;
2959 trap_expected = ecs->another_trap;
2961 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2962 specifies that such a signal should be delivered to the
2965 Typically, this would occure when a user is debugging a
2966 target monitor on a simulator: the target monitor sets a
2967 breakpoint; the simulator encounters this break-point and
2968 halts the simulation handing control to GDB; GDB, noteing
2969 that the break-point isn't valid, returns control back to the
2970 simulator; the simulator then delivers the hardware
2971 equivalent of a SIGNAL_TRAP to the program being debugged. */
2973 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2974 stop_signal = TARGET_SIGNAL_0;
2977 resume (currently_stepping (ecs), stop_signal);
2980 prepare_to_wait (ecs);
2983 /* This function normally comes after a resume, before
2984 handle_inferior_event exits. It takes care of any last bits of
2985 housekeeping, and sets the all-important wait_some_more flag. */
2988 prepare_to_wait (struct execution_control_state *ecs)
2991 fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
2992 if (ecs->infwait_state == infwait_normal_state)
2994 overlay_cache_invalid = 1;
2996 /* We have to invalidate the registers BEFORE calling
2997 target_wait because they can be loaded from the target while
2998 in target_wait. This makes remote debugging a bit more
2999 efficient for those targets that provide critical registers
3000 as part of their normal status mechanism. */
3002 registers_changed ();
3003 ecs->waiton_ptid = pid_to_ptid (-1);
3004 ecs->wp = &(ecs->ws);
3006 /* This is the old end of the while loop. Let everybody know we
3007 want to wait for the inferior some more and get called again
3009 ecs->wait_some_more = 1;
3012 /* Print why the inferior has stopped. We always print something when
3013 the inferior exits, or receives a signal. The rest of the cases are
3014 dealt with later on in normal_stop() and print_it_typical(). Ideally
3015 there should be a call to this function from handle_inferior_event()
3016 each time stop_stepping() is called.*/
3018 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
3020 switch (stop_reason)
3022 case END_STEPPING_RANGE:
3023 /* We are done with a step/next/si/ni command. */
3024 /* For now print nothing. */
3025 /* Print a message only if not in the middle of doing a "step n"
3026 operation for n > 1 */
3027 if (!step_multi || !stop_step)
3028 if (ui_out_is_mi_like_p (uiout))
3031 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE));
3034 /* The inferior was terminated by a signal. */
3035 annotate_signalled ();
3036 if (ui_out_is_mi_like_p (uiout))
3039 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED));
3040 ui_out_text (uiout, "\nProgram terminated with signal ");
3041 annotate_signal_name ();
3042 ui_out_field_string (uiout, "signal-name",
3043 target_signal_to_name (stop_info));
3044 annotate_signal_name_end ();
3045 ui_out_text (uiout, ", ");
3046 annotate_signal_string ();
3047 ui_out_field_string (uiout, "signal-meaning",
3048 target_signal_to_string (stop_info));
3049 annotate_signal_string_end ();
3050 ui_out_text (uiout, ".\n");
3051 ui_out_text (uiout, "The program no longer exists.\n");
3054 /* The inferior program is finished. */
3055 annotate_exited (stop_info);
3058 if (ui_out_is_mi_like_p (uiout))
3059 ui_out_field_string (uiout, "reason",
3060 async_reason_lookup (EXEC_ASYNC_EXITED));
3061 ui_out_text (uiout, "\nProgram exited with code ");
3062 ui_out_field_fmt (uiout, "exit-code", "0%o",
3063 (unsigned int) stop_info);
3064 ui_out_text (uiout, ".\n");
3068 if (ui_out_is_mi_like_p (uiout))
3071 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY));
3072 ui_out_text (uiout, "\nProgram exited normally.\n");
3074 /* Support the --return-child-result option. */
3075 return_child_result_value = stop_info;
3077 case SIGNAL_RECEIVED:
3078 /* Signal received. The signal table tells us to print about
3081 ui_out_text (uiout, "\nProgram received signal ");
3082 annotate_signal_name ();
3083 if (ui_out_is_mi_like_p (uiout))
3085 (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED));
3086 ui_out_field_string (uiout, "signal-name",
3087 target_signal_to_name (stop_info));
3088 annotate_signal_name_end ();
3089 ui_out_text (uiout, ", ");
3090 annotate_signal_string ();
3091 ui_out_field_string (uiout, "signal-meaning",
3092 target_signal_to_string (stop_info));
3093 annotate_signal_string_end ();
3094 ui_out_text (uiout, ".\n");
3097 internal_error (__FILE__, __LINE__,
3098 _("print_stop_reason: unrecognized enum value"));
3104 /* Here to return control to GDB when the inferior stops for real.
3105 Print appropriate messages, remove breakpoints, give terminal our modes.
3107 STOP_PRINT_FRAME nonzero means print the executing frame
3108 (pc, function, args, file, line number and line text).
3109 BREAKPOINTS_FAILED nonzero means stop was due to error
3110 attempting to insert breakpoints. */
3115 struct target_waitstatus last;
3118 get_last_target_status (&last_ptid, &last);
3120 /* As with the notification of thread events, we want to delay
3121 notifying the user that we've switched thread context until
3122 the inferior actually stops.
3124 There's no point in saying anything if the inferior has exited.
3125 Note that SIGNALLED here means "exited with a signal", not
3126 "received a signal". */
3127 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
3128 && target_has_execution
3129 && last.kind != TARGET_WAITKIND_SIGNALLED
3130 && last.kind != TARGET_WAITKIND_EXITED)
3132 target_terminal_ours_for_output ();
3133 printf_filtered (_("[Switching to %s]\n"),
3134 target_pid_or_tid_to_str (inferior_ptid));
3135 previous_inferior_ptid = inferior_ptid;
3138 /* NOTE drow/2004-01-17: Is this still necessary? */
3139 /* Make sure that the current_frame's pc is correct. This
3140 is a correction for setting up the frame info before doing
3141 gdbarch_decr_pc_after_break */
3142 if (target_has_execution)
3143 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3144 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3145 frame code to check for this and sort out any resultant mess.
3146 gdbarch_decr_pc_after_break needs to just go away. */
3147 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3149 if (target_has_execution && breakpoints_inserted)
3151 if (remove_breakpoints ())
3153 target_terminal_ours_for_output ();
3154 printf_filtered (_("\
3155 Cannot remove breakpoints because program is no longer writable.\n\
3156 It might be running in another process.\n\
3157 Further execution is probably impossible.\n"));
3160 breakpoints_inserted = 0;
3162 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3163 Delete any breakpoint that is to be deleted at the next stop. */
3165 breakpoint_auto_delete (stop_bpstat);
3167 /* If an auto-display called a function and that got a signal,
3168 delete that auto-display to avoid an infinite recursion. */
3170 if (stopped_by_random_signal)
3171 disable_current_display ();
3173 /* Don't print a message if in the middle of doing a "step n"
3174 operation for n > 1 */
3175 if (step_multi && stop_step)
3178 target_terminal_ours ();
3180 /* Set the current source location. This will also happen if we
3181 display the frame below, but the current SAL will be incorrect
3182 during a user hook-stop function. */
3183 if (target_has_stack && !stop_stack_dummy)
3184 set_current_sal_from_frame (get_current_frame (), 1);
3186 /* Look up the hook_stop and run it (CLI internally handles problem
3187 of stop_command's pre-hook not existing). */
3189 catch_errors (hook_stop_stub, stop_command,
3190 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3192 if (!target_has_stack)
3198 /* Select innermost stack frame - i.e., current frame is frame 0,
3199 and current location is based on that.
3200 Don't do this on return from a stack dummy routine,
3201 or if the program has exited. */
3203 if (!stop_stack_dummy)
3205 select_frame (get_current_frame ());
3207 /* Print current location without a level number, if
3208 we have changed functions or hit a breakpoint.
3209 Print source line if we have one.
3210 bpstat_print() contains the logic deciding in detail
3211 what to print, based on the event(s) that just occurred. */
3213 if (stop_print_frame)
3217 int do_frame_printing = 1;
3219 bpstat_ret = bpstat_print (stop_bpstat);
3223 /* If we had hit a shared library event breakpoint,
3224 bpstat_print would print out this message. If we hit
3225 an OS-level shared library event, do the same
3227 if (last.kind == TARGET_WAITKIND_LOADED)
3229 printf_filtered (_("Stopped due to shared library event\n"));
3230 source_flag = SRC_LINE; /* something bogus */
3231 do_frame_printing = 0;
3235 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3236 (or should) carry around the function and does (or
3237 should) use that when doing a frame comparison. */
3239 && frame_id_eq (step_frame_id,
3240 get_frame_id (get_current_frame ()))
3241 && step_start_function == find_pc_function (stop_pc))
3242 source_flag = SRC_LINE; /* finished step, just print source line */
3244 source_flag = SRC_AND_LOC; /* print location and source line */
3246 case PRINT_SRC_AND_LOC:
3247 source_flag = SRC_AND_LOC; /* print location and source line */
3249 case PRINT_SRC_ONLY:
3250 source_flag = SRC_LINE;
3253 source_flag = SRC_LINE; /* something bogus */
3254 do_frame_printing = 0;
3257 internal_error (__FILE__, __LINE__, _("Unknown value."));
3260 if (ui_out_is_mi_like_p (uiout))
3261 ui_out_field_int (uiout, "thread-id",
3262 pid_to_thread_id (inferior_ptid));
3263 /* The behavior of this routine with respect to the source
3265 SRC_LINE: Print only source line
3266 LOCATION: Print only location
3267 SRC_AND_LOC: Print location and source line */
3268 if (do_frame_printing)
3269 print_stack_frame (get_selected_frame (NULL), 0, source_flag);
3271 /* Display the auto-display expressions. */
3276 /* Save the function value return registers, if we care.
3277 We might be about to restore their previous contents. */
3278 if (proceed_to_finish)
3280 /* This should not be necessary. */
3282 regcache_xfree (stop_registers);
3284 /* NB: The copy goes through to the target picking up the value of
3285 all the registers. */
3286 stop_registers = regcache_dup (get_current_regcache ());
3289 if (stop_stack_dummy)
3291 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3292 ends with a setting of the current frame, so we can use that
3294 frame_pop (get_current_frame ());
3295 /* Set stop_pc to what it was before we called the function.
3296 Can't rely on restore_inferior_status because that only gets
3297 called if we don't stop in the called function. */
3298 stop_pc = read_pc ();
3299 select_frame (get_current_frame ());
3303 annotate_stopped ();
3304 observer_notify_normal_stop (stop_bpstat);
3308 hook_stop_stub (void *cmd)
3310 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3315 signal_stop_state (int signo)
3317 return signal_stop[signo];
3321 signal_print_state (int signo)
3323 return signal_print[signo];
3327 signal_pass_state (int signo)
3329 return signal_program[signo];
3333 signal_stop_update (int signo, int state)
3335 int ret = signal_stop[signo];
3336 signal_stop[signo] = state;
3341 signal_print_update (int signo, int state)
3343 int ret = signal_print[signo];
3344 signal_print[signo] = state;
3349 signal_pass_update (int signo, int state)
3351 int ret = signal_program[signo];
3352 signal_program[signo] = state;
3357 sig_print_header (void)
3359 printf_filtered (_("\
3360 Signal Stop\tPrint\tPass to program\tDescription\n"));
3364 sig_print_info (enum target_signal oursig)
3366 char *name = target_signal_to_name (oursig);
3367 int name_padding = 13 - strlen (name);
3369 if (name_padding <= 0)
3372 printf_filtered ("%s", name);
3373 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3374 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3375 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3376 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3377 printf_filtered ("%s\n", target_signal_to_string (oursig));
3380 /* Specify how various signals in the inferior should be handled. */
3383 handle_command (char *args, int from_tty)
3386 int digits, wordlen;
3387 int sigfirst, signum, siglast;
3388 enum target_signal oursig;
3391 unsigned char *sigs;
3392 struct cleanup *old_chain;
3396 error_no_arg (_("signal to handle"));
3399 /* Allocate and zero an array of flags for which signals to handle. */
3401 nsigs = (int) TARGET_SIGNAL_LAST;
3402 sigs = (unsigned char *) alloca (nsigs);
3403 memset (sigs, 0, nsigs);
3405 /* Break the command line up into args. */
3407 argv = buildargv (args);
3412 old_chain = make_cleanup_freeargv (argv);
3414 /* Walk through the args, looking for signal oursigs, signal names, and
3415 actions. Signal numbers and signal names may be interspersed with
3416 actions, with the actions being performed for all signals cumulatively
3417 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3419 while (*argv != NULL)
3421 wordlen = strlen (*argv);
3422 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3426 sigfirst = siglast = -1;
3428 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3430 /* Apply action to all signals except those used by the
3431 debugger. Silently skip those. */
3434 siglast = nsigs - 1;
3436 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3438 SET_SIGS (nsigs, sigs, signal_stop);
3439 SET_SIGS (nsigs, sigs, signal_print);
3441 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3443 UNSET_SIGS (nsigs, sigs, signal_program);
3445 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3447 SET_SIGS (nsigs, sigs, signal_print);
3449 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3451 SET_SIGS (nsigs, sigs, signal_program);
3453 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3455 UNSET_SIGS (nsigs, sigs, signal_stop);
3457 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3459 SET_SIGS (nsigs, sigs, signal_program);
3461 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3463 UNSET_SIGS (nsigs, sigs, signal_print);
3464 UNSET_SIGS (nsigs, sigs, signal_stop);
3466 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3468 UNSET_SIGS (nsigs, sigs, signal_program);
3470 else if (digits > 0)
3472 /* It is numeric. The numeric signal refers to our own
3473 internal signal numbering from target.h, not to host/target
3474 signal number. This is a feature; users really should be
3475 using symbolic names anyway, and the common ones like
3476 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3478 sigfirst = siglast = (int)
3479 target_signal_from_command (atoi (*argv));
3480 if ((*argv)[digits] == '-')
3483 target_signal_from_command (atoi ((*argv) + digits + 1));
3485 if (sigfirst > siglast)
3487 /* Bet he didn't figure we'd think of this case... */
3495 oursig = target_signal_from_name (*argv);
3496 if (oursig != TARGET_SIGNAL_UNKNOWN)
3498 sigfirst = siglast = (int) oursig;
3502 /* Not a number and not a recognized flag word => complain. */
3503 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv);
3507 /* If any signal numbers or symbol names were found, set flags for
3508 which signals to apply actions to. */
3510 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3512 switch ((enum target_signal) signum)
3514 case TARGET_SIGNAL_TRAP:
3515 case TARGET_SIGNAL_INT:
3516 if (!allsigs && !sigs[signum])
3518 if (query ("%s is used by the debugger.\n\
3519 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3525 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3526 gdb_flush (gdb_stdout);
3530 case TARGET_SIGNAL_0:
3531 case TARGET_SIGNAL_DEFAULT:
3532 case TARGET_SIGNAL_UNKNOWN:
3533 /* Make sure that "all" doesn't print these. */
3544 target_notice_signals (inferior_ptid);
3548 /* Show the results. */
3549 sig_print_header ();
3550 for (signum = 0; signum < nsigs; signum++)
3554 sig_print_info (signum);
3559 do_cleanups (old_chain);
3563 xdb_handle_command (char *args, int from_tty)
3566 struct cleanup *old_chain;
3568 /* Break the command line up into args. */
3570 argv = buildargv (args);
3575 old_chain = make_cleanup_freeargv (argv);
3576 if (argv[1] != (char *) NULL)
3581 bufLen = strlen (argv[0]) + 20;
3582 argBuf = (char *) xmalloc (bufLen);
3586 enum target_signal oursig;
3588 oursig = target_signal_from_name (argv[0]);
3589 memset (argBuf, 0, bufLen);
3590 if (strcmp (argv[1], "Q") == 0)
3591 sprintf (argBuf, "%s %s", argv[0], "noprint");
3594 if (strcmp (argv[1], "s") == 0)
3596 if (!signal_stop[oursig])
3597 sprintf (argBuf, "%s %s", argv[0], "stop");
3599 sprintf (argBuf, "%s %s", argv[0], "nostop");
3601 else if (strcmp (argv[1], "i") == 0)
3603 if (!signal_program[oursig])
3604 sprintf (argBuf, "%s %s", argv[0], "pass");
3606 sprintf (argBuf, "%s %s", argv[0], "nopass");
3608 else if (strcmp (argv[1], "r") == 0)
3610 if (!signal_print[oursig])
3611 sprintf (argBuf, "%s %s", argv[0], "print");
3613 sprintf (argBuf, "%s %s", argv[0], "noprint");
3619 handle_command (argBuf, from_tty);
3621 printf_filtered (_("Invalid signal handling flag.\n"));
3626 do_cleanups (old_chain);
3629 /* Print current contents of the tables set by the handle command.
3630 It is possible we should just be printing signals actually used
3631 by the current target (but for things to work right when switching
3632 targets, all signals should be in the signal tables). */
3635 signals_info (char *signum_exp, int from_tty)
3637 enum target_signal oursig;
3638 sig_print_header ();
3642 /* First see if this is a symbol name. */
3643 oursig = target_signal_from_name (signum_exp);
3644 if (oursig == TARGET_SIGNAL_UNKNOWN)
3646 /* No, try numeric. */
3648 target_signal_from_command (parse_and_eval_long (signum_exp));
3650 sig_print_info (oursig);
3654 printf_filtered ("\n");
3655 /* These ugly casts brought to you by the native VAX compiler. */
3656 for (oursig = TARGET_SIGNAL_FIRST;
3657 (int) oursig < (int) TARGET_SIGNAL_LAST;
3658 oursig = (enum target_signal) ((int) oursig + 1))
3662 if (oursig != TARGET_SIGNAL_UNKNOWN
3663 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3664 sig_print_info (oursig);
3667 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3670 struct inferior_status
3672 enum target_signal stop_signal;
3676 int stop_stack_dummy;
3677 int stopped_by_random_signal;
3679 CORE_ADDR step_range_start;
3680 CORE_ADDR step_range_end;
3681 struct frame_id step_frame_id;
3682 enum step_over_calls_kind step_over_calls;
3683 CORE_ADDR step_resume_break_address;
3684 int stop_after_trap;
3687 /* These are here because if call_function_by_hand has written some
3688 registers and then decides to call error(), we better not have changed
3690 struct regcache *registers;
3692 /* A frame unique identifier. */
3693 struct frame_id selected_frame_id;
3695 int breakpoint_proceeded;
3696 int restore_stack_info;
3697 int proceed_to_finish;
3701 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3704 int size = register_size (current_gdbarch, regno);
3705 void *buf = alloca (size);
3706 store_signed_integer (buf, size, val);
3707 regcache_raw_write (inf_status->registers, regno, buf);
3710 /* Save all of the information associated with the inferior<==>gdb
3711 connection. INF_STATUS is a pointer to a "struct inferior_status"
3712 (defined in inferior.h). */
3714 struct inferior_status *
3715 save_inferior_status (int restore_stack_info)
3717 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3719 inf_status->stop_signal = stop_signal;
3720 inf_status->stop_pc = stop_pc;
3721 inf_status->stop_step = stop_step;
3722 inf_status->stop_stack_dummy = stop_stack_dummy;
3723 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3724 inf_status->trap_expected = trap_expected;
3725 inf_status->step_range_start = step_range_start;
3726 inf_status->step_range_end = step_range_end;
3727 inf_status->step_frame_id = step_frame_id;
3728 inf_status->step_over_calls = step_over_calls;
3729 inf_status->stop_after_trap = stop_after_trap;
3730 inf_status->stop_soon = stop_soon;
3731 /* Save original bpstat chain here; replace it with copy of chain.
3732 If caller's caller is walking the chain, they'll be happier if we
3733 hand them back the original chain when restore_inferior_status is
3735 inf_status->stop_bpstat = stop_bpstat;
3736 stop_bpstat = bpstat_copy (stop_bpstat);
3737 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3738 inf_status->restore_stack_info = restore_stack_info;
3739 inf_status->proceed_to_finish = proceed_to_finish;
3741 inf_status->registers = regcache_dup (get_current_regcache ());
3743 inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL));
3748 restore_selected_frame (void *args)
3750 struct frame_id *fid = (struct frame_id *) args;
3751 struct frame_info *frame;
3753 frame = frame_find_by_id (*fid);
3755 /* If inf_status->selected_frame_id is NULL, there was no previously
3759 warning (_("Unable to restore previously selected frame."));
3763 select_frame (frame);
3769 restore_inferior_status (struct inferior_status *inf_status)
3771 stop_signal = inf_status->stop_signal;
3772 stop_pc = inf_status->stop_pc;
3773 stop_step = inf_status->stop_step;
3774 stop_stack_dummy = inf_status->stop_stack_dummy;
3775 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3776 trap_expected = inf_status->trap_expected;
3777 step_range_start = inf_status->step_range_start;
3778 step_range_end = inf_status->step_range_end;
3779 step_frame_id = inf_status->step_frame_id;
3780 step_over_calls = inf_status->step_over_calls;
3781 stop_after_trap = inf_status->stop_after_trap;
3782 stop_soon = inf_status->stop_soon;
3783 bpstat_clear (&stop_bpstat);
3784 stop_bpstat = inf_status->stop_bpstat;
3785 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3786 proceed_to_finish = inf_status->proceed_to_finish;
3788 /* The inferior can be gone if the user types "print exit(0)"
3789 (and perhaps other times). */
3790 if (target_has_execution)
3791 /* NB: The register write goes through to the target. */
3792 regcache_cpy (get_current_regcache (), inf_status->registers);
3793 regcache_xfree (inf_status->registers);
3795 /* FIXME: If we are being called after stopping in a function which
3796 is called from gdb, we should not be trying to restore the
3797 selected frame; it just prints a spurious error message (The
3798 message is useful, however, in detecting bugs in gdb (like if gdb
3799 clobbers the stack)). In fact, should we be restoring the
3800 inferior status at all in that case? . */
3802 if (target_has_stack && inf_status->restore_stack_info)
3804 /* The point of catch_errors is that if the stack is clobbered,
3805 walking the stack might encounter a garbage pointer and
3806 error() trying to dereference it. */
3808 (restore_selected_frame, &inf_status->selected_frame_id,
3809 "Unable to restore previously selected frame:\n",
3810 RETURN_MASK_ERROR) == 0)
3811 /* Error in restoring the selected frame. Select the innermost
3813 select_frame (get_current_frame ());
3821 do_restore_inferior_status_cleanup (void *sts)
3823 restore_inferior_status (sts);
3827 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3829 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3833 discard_inferior_status (struct inferior_status *inf_status)
3835 /* See save_inferior_status for info on stop_bpstat. */
3836 bpstat_clear (&inf_status->stop_bpstat);
3837 regcache_xfree (inf_status->registers);
3842 inferior_has_forked (int pid, int *child_pid)
3844 struct target_waitstatus last;
3847 get_last_target_status (&last_ptid, &last);
3849 if (last.kind != TARGET_WAITKIND_FORKED)
3852 if (ptid_get_pid (last_ptid) != pid)
3855 *child_pid = last.value.related_pid;
3860 inferior_has_vforked (int pid, int *child_pid)
3862 struct target_waitstatus last;
3865 get_last_target_status (&last_ptid, &last);
3867 if (last.kind != TARGET_WAITKIND_VFORKED)
3870 if (ptid_get_pid (last_ptid) != pid)
3873 *child_pid = last.value.related_pid;
3878 inferior_has_execd (int pid, char **execd_pathname)
3880 struct target_waitstatus last;
3883 get_last_target_status (&last_ptid, &last);
3885 if (last.kind != TARGET_WAITKIND_EXECD)
3888 if (ptid_get_pid (last_ptid) != pid)
3891 *execd_pathname = xstrdup (last.value.execd_pathname);
3895 /* Oft used ptids */
3897 ptid_t minus_one_ptid;
3899 /* Create a ptid given the necessary PID, LWP, and TID components. */
3902 ptid_build (int pid, long lwp, long tid)
3912 /* Create a ptid from just a pid. */
3915 pid_to_ptid (int pid)
3917 return ptid_build (pid, 0, 0);
3920 /* Fetch the pid (process id) component from a ptid. */
3923 ptid_get_pid (ptid_t ptid)
3928 /* Fetch the lwp (lightweight process) component from a ptid. */
3931 ptid_get_lwp (ptid_t ptid)
3936 /* Fetch the tid (thread id) component from a ptid. */
3939 ptid_get_tid (ptid_t ptid)
3944 /* ptid_equal() is used to test equality of two ptids. */
3947 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3949 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3950 && ptid1.tid == ptid2.tid);
3953 /* restore_inferior_ptid() will be used by the cleanup machinery
3954 to restore the inferior_ptid value saved in a call to
3955 save_inferior_ptid(). */
3958 restore_inferior_ptid (void *arg)
3960 ptid_t *saved_ptid_ptr = arg;
3961 inferior_ptid = *saved_ptid_ptr;
3965 /* Save the value of inferior_ptid so that it may be restored by a
3966 later call to do_cleanups(). Returns the struct cleanup pointer
3967 needed for later doing the cleanup. */
3970 save_inferior_ptid (void)
3972 ptid_t *saved_ptid_ptr;
3974 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3975 *saved_ptid_ptr = inferior_ptid;
3976 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3981 _initialize_infrun (void)
3985 struct cmd_list_element *c;
3987 add_info ("signals", signals_info, _("\
3988 What debugger does when program gets various signals.\n\
3989 Specify a signal as argument to print info on that signal only."));
3990 add_info_alias ("handle", "signals", 0);
3992 add_com ("handle", class_run, handle_command, _("\
3993 Specify how to handle a signal.\n\
3994 Args are signals and actions to apply to those signals.\n\
3995 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3996 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3997 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3998 The special arg \"all\" is recognized to mean all signals except those\n\
3999 used by the debugger, typically SIGTRAP and SIGINT.\n\
4000 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4001 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4002 Stop means reenter debugger if this signal happens (implies print).\n\
4003 Print means print a message if this signal happens.\n\
4004 Pass means let program see this signal; otherwise program doesn't know.\n\
4005 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4006 Pass and Stop may be combined."));
4009 add_com ("lz", class_info, signals_info, _("\
4010 What debugger does when program gets various signals.\n\
4011 Specify a signal as argument to print info on that signal only."));
4012 add_com ("z", class_run, xdb_handle_command, _("\
4013 Specify how to handle a signal.\n\
4014 Args are signals and actions to apply to those signals.\n\
4015 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4016 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4017 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4018 The special arg \"all\" is recognized to mean all signals except those\n\
4019 used by the debugger, typically SIGTRAP and SIGINT.\n\
4020 Recognized actions include \"s\" (toggles between stop and nostop), \n\
4021 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4022 nopass), \"Q\" (noprint)\n\
4023 Stop means reenter debugger if this signal happens (implies print).\n\
4024 Print means print a message if this signal happens.\n\
4025 Pass means let program see this signal; otherwise program doesn't know.\n\
4026 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4027 Pass and Stop may be combined."));
4031 stop_command = add_cmd ("stop", class_obscure,
4032 not_just_help_class_command, _("\
4033 There is no `stop' command, but you can set a hook on `stop'.\n\
4034 This allows you to set a list of commands to be run each time execution\n\
4035 of the program stops."), &cmdlist);
4037 add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\
4038 Set inferior debugging."), _("\
4039 Show inferior debugging."), _("\
4040 When non-zero, inferior specific debugging is enabled."),
4043 &setdebuglist, &showdebuglist);
4045 numsigs = (int) TARGET_SIGNAL_LAST;
4046 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
4047 signal_print = (unsigned char *)
4048 xmalloc (sizeof (signal_print[0]) * numsigs);
4049 signal_program = (unsigned char *)
4050 xmalloc (sizeof (signal_program[0]) * numsigs);
4051 for (i = 0; i < numsigs; i++)
4054 signal_print[i] = 1;
4055 signal_program[i] = 1;
4058 /* Signals caused by debugger's own actions
4059 should not be given to the program afterwards. */
4060 signal_program[TARGET_SIGNAL_TRAP] = 0;
4061 signal_program[TARGET_SIGNAL_INT] = 0;
4063 /* Signals that are not errors should not normally enter the debugger. */
4064 signal_stop[TARGET_SIGNAL_ALRM] = 0;
4065 signal_print[TARGET_SIGNAL_ALRM] = 0;
4066 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
4067 signal_print[TARGET_SIGNAL_VTALRM] = 0;
4068 signal_stop[TARGET_SIGNAL_PROF] = 0;
4069 signal_print[TARGET_SIGNAL_PROF] = 0;
4070 signal_stop[TARGET_SIGNAL_CHLD] = 0;
4071 signal_print[TARGET_SIGNAL_CHLD] = 0;
4072 signal_stop[TARGET_SIGNAL_IO] = 0;
4073 signal_print[TARGET_SIGNAL_IO] = 0;
4074 signal_stop[TARGET_SIGNAL_POLL] = 0;
4075 signal_print[TARGET_SIGNAL_POLL] = 0;
4076 signal_stop[TARGET_SIGNAL_URG] = 0;
4077 signal_print[TARGET_SIGNAL_URG] = 0;
4078 signal_stop[TARGET_SIGNAL_WINCH] = 0;
4079 signal_print[TARGET_SIGNAL_WINCH] = 0;
4081 /* These signals are used internally by user-level thread
4082 implementations. (See signal(5) on Solaris.) Like the above
4083 signals, a healthy program receives and handles them as part of
4084 its normal operation. */
4085 signal_stop[TARGET_SIGNAL_LWP] = 0;
4086 signal_print[TARGET_SIGNAL_LWP] = 0;
4087 signal_stop[TARGET_SIGNAL_WAITING] = 0;
4088 signal_print[TARGET_SIGNAL_WAITING] = 0;
4089 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4090 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4092 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support,
4093 &stop_on_solib_events, _("\
4094 Set stopping for shared library events."), _("\
4095 Show stopping for shared library events."), _("\
4096 If nonzero, gdb will give control to the user when the dynamic linker\n\
4097 notifies gdb of shared library events. The most common event of interest\n\
4098 to the user would be loading/unloading of a new library."),
4100 show_stop_on_solib_events,
4101 &setlist, &showlist);
4103 add_setshow_enum_cmd ("follow-fork-mode", class_run,
4104 follow_fork_mode_kind_names,
4105 &follow_fork_mode_string, _("\
4106 Set debugger response to a program call of fork or vfork."), _("\
4107 Show debugger response to a program call of fork or vfork."), _("\
4108 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4109 parent - the original process is debugged after a fork\n\
4110 child - the new process is debugged after a fork\n\
4111 The unfollowed process will continue to run.\n\
4112 By default, the debugger will follow the parent process."),
4114 show_follow_fork_mode_string,
4115 &setlist, &showlist);
4117 add_setshow_enum_cmd ("scheduler-locking", class_run,
4118 scheduler_enums, &scheduler_mode, _("\
4119 Set mode for locking scheduler during execution."), _("\
4120 Show mode for locking scheduler during execution."), _("\
4121 off == no locking (threads may preempt at any time)\n\
4122 on == full locking (no thread except the current thread may run)\n\
4123 step == scheduler locked during every single-step operation.\n\
4124 In this mode, no other thread may run during a step command.\n\
4125 Other threads may run while stepping over a function call ('next')."),
4126 set_schedlock_func, /* traps on target vector */
4127 show_scheduler_mode,
4128 &setlist, &showlist);
4130 add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\
4131 Set mode of the step operation."), _("\
4132 Show mode of the step operation."), _("\
4133 When set, doing a step over a function without debug line information\n\
4134 will stop at the first instruction of that function. Otherwise, the\n\
4135 function is skipped and the step command stops at a different source line."),
4137 show_step_stop_if_no_debug,
4138 &setlist, &showlist);
4140 /* ptid initializations */
4141 null_ptid = ptid_build (0, 0, 0);
4142 minus_one_ptid = ptid_build (-1, 0, 0);
4143 inferior_ptid = null_ptid;
4144 target_last_wait_ptid = minus_one_ptid;