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 /* Try to reenable shared library breakpoints, additional
1341 code segments in shared libraries might be mapped in now. */
1342 re_enable_breakpoints_in_shlibs ();
1344 /* If requested, stop when the dynamic linker notifies
1345 gdb of events. This allows the user to get control
1346 and place breakpoints in initializer routines for
1347 dynamically loaded objects (among other things). */
1348 if (stop_on_solib_events)
1350 stop_stepping (ecs);
1354 /* NOTE drow/2007-05-11: This might be a good place to check
1355 for "catch load". */
1357 /* Reinsert breakpoints and continue. */
1358 if (breakpoints_were_inserted)
1360 insert_breakpoints ();
1361 breakpoints_inserted = 1;
1365 /* If we are skipping through a shell, or through shared library
1366 loading that we aren't interested in, resume the program. If
1367 we're running the program normally, also resume. But stop if
1368 we're attaching or setting up a remote connection. */
1369 if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY)
1371 resume (0, TARGET_SIGNAL_0);
1372 prepare_to_wait (ecs);
1378 case TARGET_WAITKIND_SPURIOUS:
1380 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1381 resume (0, TARGET_SIGNAL_0);
1382 prepare_to_wait (ecs);
1385 case TARGET_WAITKIND_EXITED:
1387 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n");
1388 target_terminal_ours (); /* Must do this before mourn anyway */
1389 print_stop_reason (EXITED, ecs->ws.value.integer);
1391 /* Record the exit code in the convenience variable $_exitcode, so
1392 that the user can inspect this again later. */
1393 set_internalvar (lookup_internalvar ("_exitcode"),
1394 value_from_longest (builtin_type_int,
1395 (LONGEST) ecs->ws.value.integer));
1396 gdb_flush (gdb_stdout);
1397 target_mourn_inferior ();
1398 singlestep_breakpoints_inserted_p = 0;
1399 stop_print_frame = 0;
1400 stop_stepping (ecs);
1403 case TARGET_WAITKIND_SIGNALLED:
1405 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1406 stop_print_frame = 0;
1407 stop_signal = ecs->ws.value.sig;
1408 target_terminal_ours (); /* Must do this before mourn anyway */
1410 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1411 reach here unless the inferior is dead. However, for years
1412 target_kill() was called here, which hints that fatal signals aren't
1413 really fatal on some systems. If that's true, then some changes
1415 target_mourn_inferior ();
1417 print_stop_reason (SIGNAL_EXITED, stop_signal);
1418 singlestep_breakpoints_inserted_p = 0;
1419 stop_stepping (ecs);
1422 /* The following are the only cases in which we keep going;
1423 the above cases end in a continue or goto. */
1424 case TARGET_WAITKIND_FORKED:
1425 case TARGET_WAITKIND_VFORKED:
1427 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n");
1428 stop_signal = TARGET_SIGNAL_TRAP;
1429 pending_follow.kind = ecs->ws.kind;
1431 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1432 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1434 if (!ptid_equal (ecs->ptid, inferior_ptid))
1436 context_switch (ecs);
1437 reinit_frame_cache ();
1440 stop_pc = read_pc ();
1442 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1444 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1446 /* If no catchpoint triggered for this, then keep going. */
1447 if (ecs->random_signal)
1449 stop_signal = TARGET_SIGNAL_0;
1453 goto process_event_stop_test;
1455 case TARGET_WAITKIND_EXECD:
1457 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n");
1458 stop_signal = TARGET_SIGNAL_TRAP;
1460 /* NOTE drow/2002-12-05: This code should be pushed down into the
1461 target_wait function. Until then following vfork on HP/UX 10.20
1462 is probably broken by this. Of course, it's broken anyway. */
1463 /* Is this a target which reports multiple exec events per actual
1464 call to exec()? (HP-UX using ptrace does, for example.) If so,
1465 ignore all but the last one. Just resume the exec'r, and wait
1466 for the next exec event. */
1467 if (inferior_ignoring_leading_exec_events)
1469 inferior_ignoring_leading_exec_events--;
1470 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1471 prepare_to_wait (ecs);
1474 inferior_ignoring_leading_exec_events =
1475 target_reported_exec_events_per_exec_call () - 1;
1477 pending_follow.execd_pathname =
1478 savestring (ecs->ws.value.execd_pathname,
1479 strlen (ecs->ws.value.execd_pathname));
1481 /* This causes the eventpoints and symbol table to be reset. Must
1482 do this now, before trying to determine whether to stop. */
1483 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1484 xfree (pending_follow.execd_pathname);
1486 stop_pc = read_pc_pid (ecs->ptid);
1487 ecs->saved_inferior_ptid = inferior_ptid;
1488 inferior_ptid = ecs->ptid;
1490 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1492 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1493 inferior_ptid = ecs->saved_inferior_ptid;
1495 if (!ptid_equal (ecs->ptid, inferior_ptid))
1497 context_switch (ecs);
1498 reinit_frame_cache ();
1501 /* If no catchpoint triggered for this, then keep going. */
1502 if (ecs->random_signal)
1504 stop_signal = TARGET_SIGNAL_0;
1508 goto process_event_stop_test;
1510 /* Be careful not to try to gather much state about a thread
1511 that's in a syscall. It's frequently a losing proposition. */
1512 case TARGET_WAITKIND_SYSCALL_ENTRY:
1514 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1515 resume (0, TARGET_SIGNAL_0);
1516 prepare_to_wait (ecs);
1519 /* Before examining the threads further, step this thread to
1520 get it entirely out of the syscall. (We get notice of the
1521 event when the thread is just on the verge of exiting a
1522 syscall. Stepping one instruction seems to get it back
1524 case TARGET_WAITKIND_SYSCALL_RETURN:
1526 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1527 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1528 prepare_to_wait (ecs);
1531 case TARGET_WAITKIND_STOPPED:
1533 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n");
1534 stop_signal = ecs->ws.value.sig;
1537 /* We had an event in the inferior, but we are not interested
1538 in handling it at this level. The lower layers have already
1539 done what needs to be done, if anything.
1541 One of the possible circumstances for this is when the
1542 inferior produces output for the console. The inferior has
1543 not stopped, and we are ignoring the event. Another possible
1544 circumstance is any event which the lower level knows will be
1545 reported multiple times without an intervening resume. */
1546 case TARGET_WAITKIND_IGNORE:
1548 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n");
1549 prepare_to_wait (ecs);
1553 /* We may want to consider not doing a resume here in order to give
1554 the user a chance to play with the new thread. It might be good
1555 to make that a user-settable option. */
1557 /* At this point, all threads are stopped (happens automatically in
1558 either the OS or the native code). Therefore we need to continue
1559 all threads in order to make progress. */
1560 if (ecs->new_thread_event)
1562 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1563 prepare_to_wait (ecs);
1567 stop_pc = read_pc_pid (ecs->ptid);
1570 fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc));
1572 if (stepping_past_singlestep_breakpoint)
1574 gdb_assert (singlestep_breakpoints_inserted_p);
1575 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1576 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1578 stepping_past_singlestep_breakpoint = 0;
1580 /* We've either finished single-stepping past the single-step
1581 breakpoint, or stopped for some other reason. It would be nice if
1582 we could tell, but we can't reliably. */
1583 if (stop_signal == TARGET_SIGNAL_TRAP)
1586 fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n");
1587 /* Pull the single step breakpoints out of the target. */
1588 remove_single_step_breakpoints ();
1589 singlestep_breakpoints_inserted_p = 0;
1591 ecs->random_signal = 0;
1593 ecs->ptid = saved_singlestep_ptid;
1594 context_switch (ecs);
1595 if (deprecated_context_hook)
1596 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1598 resume (1, TARGET_SIGNAL_0);
1599 prepare_to_wait (ecs);
1604 stepping_past_singlestep_breakpoint = 0;
1606 if (stepping_past_breakpoint)
1608 stepping_past_breakpoint = 0;
1610 /* If we stopped for some other reason than single-stepping, ignore
1611 the fact that we were supposed to switch back. */
1612 if (stop_signal == TARGET_SIGNAL_TRAP)
1615 fprintf_unfiltered (gdb_stdlog,
1616 "infrun: stepping_past_breakpoint\n");
1618 /* Pull the single step breakpoints out of the target. */
1619 if (singlestep_breakpoints_inserted_p)
1621 remove_single_step_breakpoints ();
1622 singlestep_breakpoints_inserted_p = 0;
1625 /* Note: We do not call context_switch at this point, as the
1626 context is already set up for stepping the original thread. */
1627 switch_to_thread (stepping_past_breakpoint_ptid);
1628 /* Suppress spurious "Switching to ..." message. */
1629 previous_inferior_ptid = inferior_ptid;
1631 resume (1, TARGET_SIGNAL_0);
1632 prepare_to_wait (ecs);
1637 /* See if a thread hit a thread-specific breakpoint that was meant for
1638 another thread. If so, then step that thread past the breakpoint,
1641 if (stop_signal == TARGET_SIGNAL_TRAP)
1643 int thread_hop_needed = 0;
1645 /* Check if a regular breakpoint has been hit before checking
1646 for a potential single step breakpoint. Otherwise, GDB will
1647 not see this breakpoint hit when stepping onto breakpoints. */
1648 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1650 ecs->random_signal = 0;
1651 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1652 thread_hop_needed = 1;
1654 else if (singlestep_breakpoints_inserted_p)
1656 /* We have not context switched yet, so this should be true
1657 no matter which thread hit the singlestep breakpoint. */
1658 gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid));
1660 fprintf_unfiltered (gdb_stdlog, "infrun: software single step "
1662 target_pid_to_str (ecs->ptid));
1664 ecs->random_signal = 0;
1665 /* The call to in_thread_list is necessary because PTIDs sometimes
1666 change when we go from single-threaded to multi-threaded. If
1667 the singlestep_ptid is still in the list, assume that it is
1668 really different from ecs->ptid. */
1669 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1670 && in_thread_list (singlestep_ptid))
1672 /* If the PC of the thread we were trying to single-step
1673 has changed, discard this event (which we were going
1674 to ignore anyway), and pretend we saw that thread
1675 trap. This prevents us continuously moving the
1676 single-step breakpoint forward, one instruction at a
1677 time. If the PC has changed, then the thread we were
1678 trying to single-step has trapped or been signalled,
1679 but the event has not been reported to GDB yet.
1681 There might be some cases where this loses signal
1682 information, if a signal has arrived at exactly the
1683 same time that the PC changed, but this is the best
1684 we can do with the information available. Perhaps we
1685 should arrange to report all events for all threads
1686 when they stop, or to re-poll the remote looking for
1687 this particular thread (i.e. temporarily enable
1689 if (read_pc_pid (singlestep_ptid) != singlestep_pc)
1692 fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread,"
1693 " but expected thread advanced also\n");
1695 /* The current context still belongs to
1696 singlestep_ptid. Don't swap here, since that's
1697 the context we want to use. Just fudge our
1698 state and continue. */
1699 ecs->ptid = singlestep_ptid;
1700 stop_pc = read_pc_pid (ecs->ptid);
1705 fprintf_unfiltered (gdb_stdlog,
1706 "infrun: unexpected thread\n");
1708 thread_hop_needed = 1;
1709 stepping_past_singlestep_breakpoint = 1;
1710 saved_singlestep_ptid = singlestep_ptid;
1715 if (thread_hop_needed)
1720 fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n");
1722 /* Saw a breakpoint, but it was hit by the wrong thread.
1725 if (singlestep_breakpoints_inserted_p)
1727 /* Pull the single step breakpoints out of the target. */
1728 remove_single_step_breakpoints ();
1729 singlestep_breakpoints_inserted_p = 0;
1732 remove_status = remove_breakpoints ();
1733 /* Did we fail to remove breakpoints? If so, try
1734 to set the PC past the bp. (There's at least
1735 one situation in which we can fail to remove
1736 the bp's: On HP-UX's that use ttrace, we can't
1737 change the address space of a vforking child
1738 process until the child exits (well, okay, not
1739 then either :-) or execs. */
1740 if (remove_status != 0)
1742 /* FIXME! This is obviously non-portable! */
1743 write_pc_pid (stop_pc + 4, ecs->ptid);
1744 /* We need to restart all the threads now,
1745 * unles we're running in scheduler-locked mode.
1746 * Use currently_stepping to determine whether to
1749 /* FIXME MVS: is there any reason not to call resume()? */
1750 if (scheduler_mode == schedlock_on)
1751 target_resume (ecs->ptid,
1752 currently_stepping (ecs), TARGET_SIGNAL_0);
1754 target_resume (RESUME_ALL,
1755 currently_stepping (ecs), TARGET_SIGNAL_0);
1756 prepare_to_wait (ecs);
1761 breakpoints_inserted = 0;
1762 if (!ptid_equal (inferior_ptid, ecs->ptid))
1763 context_switch (ecs);
1764 ecs->waiton_ptid = ecs->ptid;
1765 ecs->wp = &(ecs->ws);
1766 ecs->another_trap = 1;
1768 ecs->infwait_state = infwait_thread_hop_state;
1770 registers_changed ();
1774 else if (singlestep_breakpoints_inserted_p)
1776 sw_single_step_trap_p = 1;
1777 ecs->random_signal = 0;
1781 ecs->random_signal = 1;
1783 /* See if something interesting happened to the non-current thread. If
1784 so, then switch to that thread. */
1785 if (!ptid_equal (ecs->ptid, inferior_ptid))
1788 fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n");
1790 context_switch (ecs);
1792 if (deprecated_context_hook)
1793 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1796 if (singlestep_breakpoints_inserted_p)
1798 /* Pull the single step breakpoints out of the target. */
1799 remove_single_step_breakpoints ();
1800 singlestep_breakpoints_inserted_p = 0;
1803 /* It may not be necessary to disable the watchpoint to stop over
1804 it. For example, the PA can (with some kernel cooperation)
1805 single step over a watchpoint without disabling the watchpoint. */
1806 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1809 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1811 prepare_to_wait (ecs);
1815 /* It is far more common to need to disable a watchpoint to step
1816 the inferior over it. FIXME. What else might a debug
1817 register or page protection watchpoint scheme need here? */
1818 if (gdbarch_have_nonsteppable_watchpoint (current_gdbarch)
1819 && STOPPED_BY_WATCHPOINT (ecs->ws))
1821 /* At this point, we are stopped at an instruction which has
1822 attempted to write to a piece of memory under control of
1823 a watchpoint. The instruction hasn't actually executed
1824 yet. If we were to evaluate the watchpoint expression
1825 now, we would get the old value, and therefore no change
1826 would seem to have occurred.
1828 In order to make watchpoints work `right', we really need
1829 to complete the memory write, and then evaluate the
1830 watchpoint expression. The following code does that by
1831 removing the watchpoint (actually, all watchpoints and
1832 breakpoints), single-stepping the target, re-inserting
1833 watchpoints, and then falling through to let normal
1834 single-step processing handle proceed. Since this
1835 includes evaluating watchpoints, things will come to a
1836 stop in the correct manner. */
1839 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1840 remove_breakpoints ();
1841 registers_changed ();
1842 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1844 ecs->waiton_ptid = ecs->ptid;
1845 ecs->wp = &(ecs->ws);
1846 ecs->infwait_state = infwait_nonstep_watch_state;
1847 prepare_to_wait (ecs);
1851 /* It may be possible to simply continue after a watchpoint. */
1852 if (HAVE_CONTINUABLE_WATCHPOINT)
1853 stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws);
1855 ecs->stop_func_start = 0;
1856 ecs->stop_func_end = 0;
1857 ecs->stop_func_name = 0;
1858 /* Don't care about return value; stop_func_start and stop_func_name
1859 will both be 0 if it doesn't work. */
1860 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1861 &ecs->stop_func_start, &ecs->stop_func_end);
1862 ecs->stop_func_start
1863 += gdbarch_deprecated_function_start_offset (current_gdbarch);
1864 ecs->another_trap = 0;
1865 bpstat_clear (&stop_bpstat);
1867 stop_stack_dummy = 0;
1868 stop_print_frame = 1;
1869 ecs->random_signal = 0;
1870 stopped_by_random_signal = 0;
1872 if (stop_signal == TARGET_SIGNAL_TRAP
1874 && gdbarch_single_step_through_delay_p (current_gdbarch)
1875 && currently_stepping (ecs))
1877 /* We're trying to step of a breakpoint. Turns out that we're
1878 also on an instruction that needs to be stepped multiple
1879 times before it's been fully executing. E.g., architectures
1880 with a delay slot. It needs to be stepped twice, once for
1881 the instruction and once for the delay slot. */
1882 int step_through_delay
1883 = gdbarch_single_step_through_delay (current_gdbarch,
1884 get_current_frame ());
1885 if (debug_infrun && step_through_delay)
1886 fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n");
1887 if (step_range_end == 0 && step_through_delay)
1889 /* The user issued a continue when stopped at a breakpoint.
1890 Set up for another trap and get out of here. */
1891 ecs->another_trap = 1;
1895 else if (step_through_delay)
1897 /* The user issued a step when stopped at a breakpoint.
1898 Maybe we should stop, maybe we should not - the delay
1899 slot *might* correspond to a line of source. In any
1900 case, don't decide that here, just set ecs->another_trap,
1901 making sure we single-step again before breakpoints are
1903 ecs->another_trap = 1;
1907 /* Look at the cause of the stop, and decide what to do.
1908 The alternatives are:
1909 1) break; to really stop and return to the debugger,
1910 2) drop through to start up again
1911 (set ecs->another_trap to 1 to single step once)
1912 3) set ecs->random_signal to 1, and the decision between 1 and 2
1913 will be made according to the signal handling tables. */
1915 /* First, distinguish signals caused by the debugger from signals
1916 that have to do with the program's own actions. Note that
1917 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1918 on the operating system version. Here we detect when a SIGILL or
1919 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1920 something similar for SIGSEGV, since a SIGSEGV will be generated
1921 when we're trying to execute a breakpoint instruction on a
1922 non-executable stack. This happens for call dummy breakpoints
1923 for architectures like SPARC that place call dummies on the
1926 if (stop_signal == TARGET_SIGNAL_TRAP
1927 || (breakpoints_inserted
1928 && (stop_signal == TARGET_SIGNAL_ILL
1929 || stop_signal == TARGET_SIGNAL_SEGV
1930 || stop_signal == TARGET_SIGNAL_EMT))
1931 || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP
1932 || stop_soon == STOP_QUIETLY_REMOTE)
1934 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1937 fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n");
1938 stop_print_frame = 0;
1939 stop_stepping (ecs);
1943 /* This is originated from start_remote(), start_inferior() and
1944 shared libraries hook functions. */
1945 if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE)
1948 fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
1949 stop_stepping (ecs);
1953 /* This originates from attach_command(). We need to overwrite
1954 the stop_signal here, because some kernels don't ignore a
1955 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1956 See more comments in inferior.h. */
1957 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1959 stop_stepping (ecs);
1960 if (stop_signal == TARGET_SIGNAL_STOP)
1961 stop_signal = TARGET_SIGNAL_0;
1965 /* Don't even think about breakpoints if just proceeded over a
1967 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1970 fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n");
1971 bpstat_clear (&stop_bpstat);
1975 /* See if there is a breakpoint at the current PC. */
1976 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid,
1977 stopped_by_watchpoint);
1979 /* Following in case break condition called a
1981 stop_print_frame = 1;
1984 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1985 at one stage in the past included checks for an inferior
1986 function call's call dummy's return breakpoint. The original
1987 comment, that went with the test, read:
1989 ``End of a stack dummy. Some systems (e.g. Sony news) give
1990 another signal besides SIGTRAP, so check here as well as
1993 If someone ever tries to get get call dummys on a
1994 non-executable stack to work (where the target would stop
1995 with something like a SIGSEGV), then those tests might need
1996 to be re-instated. Given, however, that the tests were only
1997 enabled when momentary breakpoints were not being used, I
1998 suspect that it won't be the case.
2000 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2001 be necessary for call dummies on a non-executable stack on
2004 if (stop_signal == TARGET_SIGNAL_TRAP)
2006 = !(bpstat_explains_signal (stop_bpstat)
2008 || (step_range_end && step_resume_breakpoint == NULL));
2011 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
2012 if (!ecs->random_signal)
2013 stop_signal = TARGET_SIGNAL_TRAP;
2017 /* When we reach this point, we've pretty much decided
2018 that the reason for stopping must've been a random
2019 (unexpected) signal. */
2022 ecs->random_signal = 1;
2024 process_event_stop_test:
2025 /* For the program's own signals, act according to
2026 the signal handling tables. */
2028 if (ecs->random_signal)
2030 /* Signal not for debugging purposes. */
2034 fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal);
2036 stopped_by_random_signal = 1;
2038 if (signal_print[stop_signal])
2041 target_terminal_ours_for_output ();
2042 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
2044 if (signal_stop[stop_signal])
2046 stop_stepping (ecs);
2049 /* If not going to stop, give terminal back
2050 if we took it away. */
2052 target_terminal_inferior ();
2054 /* Clear the signal if it should not be passed. */
2055 if (signal_program[stop_signal] == 0)
2056 stop_signal = TARGET_SIGNAL_0;
2058 if (prev_pc == read_pc ()
2059 && !breakpoints_inserted
2060 && breakpoint_here_p (read_pc ())
2061 && step_resume_breakpoint == NULL)
2063 /* We were just starting a new sequence, attempting to
2064 single-step off of a breakpoint and expecting a SIGTRAP.
2065 Intead this signal arrives. This signal will take us out
2066 of the stepping range so GDB needs to remember to, when
2067 the signal handler returns, resume stepping off that
2069 /* To simplify things, "continue" is forced to use the same
2070 code paths as single-step - set a breakpoint at the
2071 signal return address and then, once hit, step off that
2074 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2075 ecs->step_after_step_resume_breakpoint = 1;
2080 if (step_range_end != 0
2081 && stop_signal != TARGET_SIGNAL_0
2082 && stop_pc >= step_range_start && stop_pc < step_range_end
2083 && frame_id_eq (get_frame_id (get_current_frame ()),
2085 && step_resume_breakpoint == NULL)
2087 /* The inferior is about to take a signal that will take it
2088 out of the single step range. Set a breakpoint at the
2089 current PC (which is presumably where the signal handler
2090 will eventually return) and then allow the inferior to
2093 Note that this is only needed for a signal delivered
2094 while in the single-step range. Nested signals aren't a
2095 problem as they eventually all return. */
2096 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2101 /* Note: step_resume_breakpoint may be non-NULL. This occures
2102 when either there's a nested signal, or when there's a
2103 pending signal enabled just as the signal handler returns
2104 (leaving the inferior at the step-resume-breakpoint without
2105 actually executing it). Either way continue until the
2106 breakpoint is really hit. */
2111 /* Handle cases caused by hitting a breakpoint. */
2113 CORE_ADDR jmp_buf_pc;
2114 struct bpstat_what what;
2116 what = bpstat_what (stop_bpstat);
2118 if (what.call_dummy)
2120 stop_stack_dummy = 1;
2123 switch (what.main_action)
2125 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2126 /* If we hit the breakpoint at longjmp, disable it for the
2127 duration of this command. Then, install a temporary
2128 breakpoint at the target of the jmp_buf. */
2130 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2131 disable_longjmp_breakpoint ();
2132 remove_breakpoints ();
2133 breakpoints_inserted = 0;
2134 if (!gdbarch_get_longjmp_target_p (current_gdbarch)
2135 || !gdbarch_get_longjmp_target (current_gdbarch,
2136 get_current_frame (), &jmp_buf_pc))
2142 /* Need to blow away step-resume breakpoint, as it
2143 interferes with us */
2144 if (step_resume_breakpoint != NULL)
2146 delete_step_resume_breakpoint (&step_resume_breakpoint);
2149 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2150 ecs->handling_longjmp = 1; /* FIXME */
2154 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2155 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2157 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2158 remove_breakpoints ();
2159 breakpoints_inserted = 0;
2160 disable_longjmp_breakpoint ();
2161 ecs->handling_longjmp = 0; /* FIXME */
2162 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2164 /* else fallthrough */
2166 case BPSTAT_WHAT_SINGLE:
2168 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n");
2169 if (breakpoints_inserted)
2170 remove_breakpoints ();
2171 breakpoints_inserted = 0;
2172 ecs->another_trap = 1;
2173 /* Still need to check other stuff, at least the case
2174 where we are stepping and step out of the right range. */
2177 case BPSTAT_WHAT_STOP_NOISY:
2179 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2180 stop_print_frame = 1;
2182 /* We are about to nuke the step_resume_breakpointt via the
2183 cleanup chain, so no need to worry about it here. */
2185 stop_stepping (ecs);
2188 case BPSTAT_WHAT_STOP_SILENT:
2190 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2191 stop_print_frame = 0;
2193 /* We are about to nuke the step_resume_breakpoin via the
2194 cleanup chain, so no need to worry about it here. */
2196 stop_stepping (ecs);
2199 case BPSTAT_WHAT_STEP_RESUME:
2200 /* This proably demands a more elegant solution, but, yeah
2203 This function's use of the simple variable
2204 step_resume_breakpoint doesn't seem to accomodate
2205 simultaneously active step-resume bp's, although the
2206 breakpoint list certainly can.
2208 If we reach here and step_resume_breakpoint is already
2209 NULL, then apparently we have multiple active
2210 step-resume bp's. We'll just delete the breakpoint we
2211 stopped at, and carry on.
2213 Correction: what the code currently does is delete a
2214 step-resume bp, but it makes no effort to ensure that
2215 the one deleted is the one currently stopped at. MVS */
2218 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2220 if (step_resume_breakpoint == NULL)
2222 step_resume_breakpoint =
2223 bpstat_find_step_resume_breakpoint (stop_bpstat);
2225 delete_step_resume_breakpoint (&step_resume_breakpoint);
2226 if (ecs->step_after_step_resume_breakpoint)
2228 /* Back when the step-resume breakpoint was inserted, we
2229 were trying to single-step off a breakpoint. Go back
2231 ecs->step_after_step_resume_breakpoint = 0;
2232 remove_breakpoints ();
2233 breakpoints_inserted = 0;
2234 ecs->another_trap = 1;
2240 case BPSTAT_WHAT_CHECK_SHLIBS:
2241 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2244 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2245 /* Remove breakpoints, we eventually want to step over the
2246 shlib event breakpoint, and SOLIB_ADD might adjust
2247 breakpoint addresses via breakpoint_re_set. */
2248 if (breakpoints_inserted)
2249 remove_breakpoints ();
2250 breakpoints_inserted = 0;
2252 /* Check for any newly added shared libraries if we're
2253 supposed to be adding them automatically. Switch
2254 terminal for any messages produced by
2255 breakpoint_re_set. */
2256 target_terminal_ours_for_output ();
2257 /* NOTE: cagney/2003-11-25: Make certain that the target
2258 stack's section table is kept up-to-date. Architectures,
2259 (e.g., PPC64), use the section table to perform
2260 operations such as address => section name and hence
2261 require the table to contain all sections (including
2262 those found in shared libraries). */
2263 /* NOTE: cagney/2003-11-25: Pass current_target and not
2264 exec_ops to SOLIB_ADD. This is because current GDB is
2265 only tooled to propagate section_table changes out from
2266 the "current_target" (see target_resize_to_sections), and
2267 not up from the exec stratum. This, of course, isn't
2268 right. "infrun.c" should only interact with the
2269 exec/process stratum, instead relying on the target stack
2270 to propagate relevant changes (stop, section table
2271 changed, ...) up to other layers. */
2273 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2275 solib_add (NULL, 0, ¤t_target, auto_solib_add);
2277 target_terminal_inferior ();
2279 /* Try to reenable shared library breakpoints, additional
2280 code segments in shared libraries might be mapped in now. */
2281 re_enable_breakpoints_in_shlibs ();
2283 /* If requested, stop when the dynamic linker notifies
2284 gdb of events. This allows the user to get control
2285 and place breakpoints in initializer routines for
2286 dynamically loaded objects (among other things). */
2287 if (stop_on_solib_events || stop_stack_dummy)
2289 stop_stepping (ecs);
2293 /* If we stopped due to an explicit catchpoint, then the
2294 (see above) call to SOLIB_ADD pulled in any symbols
2295 from a newly-loaded library, if appropriate.
2297 We do want the inferior to stop, but not where it is
2298 now, which is in the dynamic linker callback. Rather,
2299 we would like it stop in the user's program, just after
2300 the call that caused this catchpoint to trigger. That
2301 gives the user a more useful vantage from which to
2302 examine their program's state. */
2303 else if (what.main_action
2304 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2306 /* ??rehrauer: If I could figure out how to get the
2307 right return PC from here, we could just set a temp
2308 breakpoint and resume. I'm not sure we can without
2309 cracking open the dld's shared libraries and sniffing
2310 their unwind tables and text/data ranges, and that's
2311 not a terribly portable notion.
2313 Until that time, we must step the inferior out of the
2314 dld callback, and also out of the dld itself (and any
2315 code or stubs in libdld.sl, such as "shl_load" and
2316 friends) until we reach non-dld code. At that point,
2317 we can stop stepping. */
2318 bpstat_get_triggered_catchpoints (stop_bpstat,
2320 stepping_through_solib_catchpoints);
2321 ecs->stepping_through_solib_after_catch = 1;
2323 /* Be sure to lift all breakpoints, so the inferior does
2324 actually step past this point... */
2325 ecs->another_trap = 1;
2330 /* We want to step over this breakpoint, then keep going. */
2331 ecs->another_trap = 1;
2337 case BPSTAT_WHAT_LAST:
2338 /* Not a real code, but listed here to shut up gcc -Wall. */
2340 case BPSTAT_WHAT_KEEP_CHECKING:
2345 /* We come here if we hit a breakpoint but should not
2346 stop for it. Possibly we also were stepping
2347 and should stop for that. So fall through and
2348 test for stepping. But, if not stepping,
2351 /* Are we stepping to get the inferior out of the dynamic linker's
2352 hook (and possibly the dld itself) after catching a shlib
2354 if (ecs->stepping_through_solib_after_catch)
2356 #if defined(SOLIB_ADD)
2357 /* Have we reached our destination? If not, keep going. */
2358 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2361 fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n");
2362 ecs->another_trap = 1;
2368 fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n");
2369 /* Else, stop and report the catchpoint(s) whose triggering
2370 caused us to begin stepping. */
2371 ecs->stepping_through_solib_after_catch = 0;
2372 bpstat_clear (&stop_bpstat);
2373 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2374 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2375 stop_print_frame = 1;
2376 stop_stepping (ecs);
2380 if (step_resume_breakpoint)
2383 fprintf_unfiltered (gdb_stdlog,
2384 "infrun: step-resume breakpoint is inserted\n");
2386 /* Having a step-resume breakpoint overrides anything
2387 else having to do with stepping commands until
2388 that breakpoint is reached. */
2393 if (step_range_end == 0)
2396 fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n");
2397 /* Likewise if we aren't even stepping. */
2402 /* If stepping through a line, keep going if still within it.
2404 Note that step_range_end is the address of the first instruction
2405 beyond the step range, and NOT the address of the last instruction
2407 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2410 fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n",
2411 paddr_nz (step_range_start),
2412 paddr_nz (step_range_end));
2417 /* We stepped out of the stepping range. */
2419 /* If we are stepping at the source level and entered the runtime
2420 loader dynamic symbol resolution code, we keep on single stepping
2421 until we exit the run time loader code and reach the callee's
2423 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2424 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2425 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)
2427 && in_solib_dynsym_resolve_code (stop_pc)
2431 CORE_ADDR pc_after_resolver =
2432 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2435 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n");
2437 if (pc_after_resolver)
2439 /* Set up a step-resume breakpoint at the address
2440 indicated by SKIP_SOLIB_RESOLVER. */
2441 struct symtab_and_line sr_sal;
2443 sr_sal.pc = pc_after_resolver;
2445 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2452 if (step_range_end != 1
2453 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2454 || step_over_calls == STEP_OVER_ALL)
2455 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2458 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n");
2459 /* The inferior, while doing a "step" or "next", has ended up in
2460 a signal trampoline (either by a signal being delivered or by
2461 the signal handler returning). Just single-step until the
2462 inferior leaves the trampoline (either by calling the handler
2468 /* Check for subroutine calls. The check for the current frame
2469 equalling the step ID is not necessary - the check of the
2470 previous frame's ID is sufficient - but it is a common case and
2471 cheaper than checking the previous frame's ID.
2473 NOTE: frame_id_eq will never report two invalid frame IDs as
2474 being equal, so to get into this block, both the current and
2475 previous frame must have valid frame IDs. */
2476 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id)
2477 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id))
2479 CORE_ADDR real_stop_pc;
2482 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n");
2484 if ((step_over_calls == STEP_OVER_NONE)
2485 || ((step_range_end == 1)
2486 && in_prologue (prev_pc, ecs->stop_func_start)))
2488 /* I presume that step_over_calls is only 0 when we're
2489 supposed to be stepping at the assembly language level
2490 ("stepi"). Just stop. */
2491 /* Also, maybe we just did a "nexti" inside a prolog, so we
2492 thought it was a subroutine call but it was not. Stop as
2495 print_stop_reason (END_STEPPING_RANGE, 0);
2496 stop_stepping (ecs);
2500 if (step_over_calls == STEP_OVER_ALL)
2502 /* We're doing a "next", set a breakpoint at callee's return
2503 address (the address at which the caller will
2505 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2510 /* If we are in a function call trampoline (a stub between the
2511 calling routine and the real function), locate the real
2512 function. That's what tells us (a) whether we want to step
2513 into it at all, and (b) what prologue we want to run to the
2514 end of, if we do step into it. */
2515 real_stop_pc = skip_language_trampoline (get_current_frame (), stop_pc);
2516 if (real_stop_pc == 0)
2517 real_stop_pc = gdbarch_skip_trampoline_code
2518 (current_gdbarch, get_current_frame (), stop_pc);
2519 if (real_stop_pc != 0)
2520 ecs->stop_func_start = real_stop_pc;
2523 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2524 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)
2526 in_solib_dynsym_resolve_code (ecs->stop_func_start)
2530 struct symtab_and_line sr_sal;
2532 sr_sal.pc = ecs->stop_func_start;
2534 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2539 /* If we have line number information for the function we are
2540 thinking of stepping into, step into it.
2542 If there are several symtabs at that PC (e.g. with include
2543 files), just want to know whether *any* of them have line
2544 numbers. find_pc_line handles this. */
2546 struct symtab_and_line tmp_sal;
2548 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2549 if (tmp_sal.line != 0)
2551 step_into_function (ecs);
2556 /* If we have no line number and the step-stop-if-no-debug is
2557 set, we stop the step so that the user has a chance to switch
2558 in assembly mode. */
2559 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2562 print_stop_reason (END_STEPPING_RANGE, 0);
2563 stop_stepping (ecs);
2567 /* Set a breakpoint at callee's return address (the address at
2568 which the caller will resume). */
2569 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2574 /* If we're in the return path from a shared library trampoline,
2575 we want to proceed through the trampoline when stepping. */
2576 if (gdbarch_in_solib_return_trampoline (current_gdbarch,
2577 stop_pc, ecs->stop_func_name))
2579 /* Determine where this trampoline returns. */
2580 CORE_ADDR real_stop_pc;
2581 real_stop_pc = gdbarch_skip_trampoline_code
2582 (current_gdbarch, get_current_frame (), stop_pc);
2585 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n");
2587 /* Only proceed through if we know where it's going. */
2590 /* And put the step-breakpoint there and go until there. */
2591 struct symtab_and_line sr_sal;
2593 init_sal (&sr_sal); /* initialize to zeroes */
2594 sr_sal.pc = real_stop_pc;
2595 sr_sal.section = find_pc_overlay (sr_sal.pc);
2597 /* Do not specify what the fp should be when we stop since
2598 on some machines the prologue is where the new fp value
2600 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2602 /* Restart without fiddling with the step ranges or
2609 ecs->sal = find_pc_line (stop_pc, 0);
2611 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2612 the trampoline processing logic, however, there are some trampolines
2613 that have no names, so we should do trampoline handling first. */
2614 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2615 && ecs->stop_func_name == NULL
2616 && ecs->sal.line == 0)
2619 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n");
2621 /* The inferior just stepped into, or returned to, an
2622 undebuggable function (where there is no debugging information
2623 and no line number corresponding to the address where the
2624 inferior stopped). Since we want to skip this kind of code,
2625 we keep going until the inferior returns from this
2626 function - unless the user has asked us not to (via
2627 set step-mode) or we no longer know how to get back
2628 to the call site. */
2629 if (step_stop_if_no_debug
2630 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2632 /* If we have no line number and the step-stop-if-no-debug
2633 is set, we stop the step so that the user has a chance to
2634 switch in assembly mode. */
2636 print_stop_reason (END_STEPPING_RANGE, 0);
2637 stop_stepping (ecs);
2642 /* Set a breakpoint at callee's return address (the address
2643 at which the caller will resume). */
2644 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2650 if (step_range_end == 1)
2652 /* It is stepi or nexti. We always want to stop stepping after
2655 fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n");
2657 print_stop_reason (END_STEPPING_RANGE, 0);
2658 stop_stepping (ecs);
2662 if (ecs->sal.line == 0)
2664 /* We have no line number information. That means to stop
2665 stepping (does this always happen right after one instruction,
2666 when we do "s" in a function with no line numbers,
2667 or can this happen as a result of a return or longjmp?). */
2669 fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n");
2671 print_stop_reason (END_STEPPING_RANGE, 0);
2672 stop_stepping (ecs);
2676 if ((stop_pc == ecs->sal.pc)
2677 && (ecs->current_line != ecs->sal.line
2678 || ecs->current_symtab != ecs->sal.symtab))
2680 /* We are at the start of a different line. So stop. Note that
2681 we don't stop if we step into the middle of a different line.
2682 That is said to make things like for (;;) statements work
2685 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n");
2687 print_stop_reason (END_STEPPING_RANGE, 0);
2688 stop_stepping (ecs);
2692 /* We aren't done stepping.
2694 Optimize by setting the stepping range to the line.
2695 (We might not be in the original line, but if we entered a
2696 new line in mid-statement, we continue stepping. This makes
2697 things like for(;;) statements work better.) */
2699 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2701 /* If this is the last line of the function, don't keep stepping
2702 (it would probably step us out of the function).
2703 This is particularly necessary for a one-line function,
2704 in which after skipping the prologue we better stop even though
2705 we will be in mid-line. */
2707 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n");
2709 print_stop_reason (END_STEPPING_RANGE, 0);
2710 stop_stepping (ecs);
2713 step_range_start = ecs->sal.pc;
2714 step_range_end = ecs->sal.end;
2715 step_frame_id = get_frame_id (get_current_frame ());
2716 ecs->current_line = ecs->sal.line;
2717 ecs->current_symtab = ecs->sal.symtab;
2719 /* In the case where we just stepped out of a function into the
2720 middle of a line of the caller, continue stepping, but
2721 step_frame_id must be modified to current frame */
2723 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2724 generous. It will trigger on things like a step into a frameless
2725 stackless leaf function. I think the logic should instead look
2726 at the unwound frame ID has that should give a more robust
2727 indication of what happened. */
2728 if (step - ID == current - ID)
2729 still stepping in same function;
2730 else if (step - ID == unwind (current - ID))
2731 stepped into a function;
2733 stepped out of a function;
2734 /* Of course this assumes that the frame ID unwind code is robust
2735 and we're willing to introduce frame unwind logic into this
2736 function. Fortunately, those days are nearly upon us. */
2739 struct frame_id current_frame = get_frame_id (get_current_frame ());
2740 if (!(frame_id_inner (current_frame, step_frame_id)))
2741 step_frame_id = current_frame;
2745 fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n");
2749 /* Are we in the middle of stepping? */
2752 currently_stepping (struct execution_control_state *ecs)
2754 return ((!ecs->handling_longjmp
2755 && ((step_range_end && step_resume_breakpoint == NULL)
2757 || ecs->stepping_through_solib_after_catch
2758 || bpstat_should_step ());
2761 /* Subroutine call with source code we should not step over. Do step
2762 to the first line of code in it. */
2765 step_into_function (struct execution_control_state *ecs)
2768 struct symtab_and_line sr_sal;
2770 s = find_pc_symtab (stop_pc);
2771 if (s && s->language != language_asm)
2772 ecs->stop_func_start = gdbarch_skip_prologue
2773 (current_gdbarch, ecs->stop_func_start);
2775 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2776 /* Use the step_resume_break to step until the end of the prologue,
2777 even if that involves jumps (as it seems to on the vax under
2779 /* If the prologue ends in the middle of a source line, continue to
2780 the end of that source line (if it is still within the function).
2781 Otherwise, just go to end of prologue. */
2783 && ecs->sal.pc != ecs->stop_func_start
2784 && ecs->sal.end < ecs->stop_func_end)
2785 ecs->stop_func_start = ecs->sal.end;
2787 /* Architectures which require breakpoint adjustment might not be able
2788 to place a breakpoint at the computed address. If so, the test
2789 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2790 ecs->stop_func_start to an address at which a breakpoint may be
2791 legitimately placed.
2793 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2794 made, GDB will enter an infinite loop when stepping through
2795 optimized code consisting of VLIW instructions which contain
2796 subinstructions corresponding to different source lines. On
2797 FR-V, it's not permitted to place a breakpoint on any but the
2798 first subinstruction of a VLIW instruction. When a breakpoint is
2799 set, GDB will adjust the breakpoint address to the beginning of
2800 the VLIW instruction. Thus, we need to make the corresponding
2801 adjustment here when computing the stop address. */
2803 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2805 ecs->stop_func_start
2806 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2807 ecs->stop_func_start);
2810 if (ecs->stop_func_start == stop_pc)
2812 /* We are already there: stop now. */
2814 print_stop_reason (END_STEPPING_RANGE, 0);
2815 stop_stepping (ecs);
2820 /* Put the step-breakpoint there and go until there. */
2821 init_sal (&sr_sal); /* initialize to zeroes */
2822 sr_sal.pc = ecs->stop_func_start;
2823 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2825 /* Do not specify what the fp should be when we stop since on
2826 some machines the prologue is where the new fp value is
2828 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2830 /* And make sure stepping stops right away then. */
2831 step_range_end = step_range_start;
2836 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
2837 This is used to both functions and to skip over code. */
2840 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
2841 struct frame_id sr_id)
2843 /* There should never be more than one step-resume breakpoint per
2844 thread, so we should never be setting a new
2845 step_resume_breakpoint when one is already active. */
2846 gdb_assert (step_resume_breakpoint == NULL);
2849 fprintf_unfiltered (gdb_stdlog,
2850 "infrun: inserting step-resume breakpoint at 0x%s\n",
2851 paddr_nz (sr_sal.pc));
2853 step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id,
2855 if (breakpoints_inserted)
2856 insert_breakpoints ();
2859 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
2860 to skip a potential signal handler.
2862 This is called with the interrupted function's frame. The signal
2863 handler, when it returns, will resume the interrupted function at
2867 insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame)
2869 struct symtab_and_line sr_sal;
2871 init_sal (&sr_sal); /* initialize to zeros */
2873 sr_sal.pc = gdbarch_addr_bits_remove
2874 (current_gdbarch, get_frame_pc (return_frame));
2875 sr_sal.section = find_pc_overlay (sr_sal.pc);
2877 insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame));
2880 /* Similar to insert_step_resume_breakpoint_at_frame, except
2881 but a breakpoint at the previous frame's PC. This is used to
2882 skip a function after stepping into it (for "next" or if the called
2883 function has no debugging information).
2885 The current function has almost always been reached by single
2886 stepping a call or return instruction. NEXT_FRAME belongs to the
2887 current function, and the breakpoint will be set at the caller's
2890 This is a separate function rather than reusing
2891 insert_step_resume_breakpoint_at_frame in order to avoid
2892 get_prev_frame, which may stop prematurely (see the implementation
2893 of frame_unwind_id for an example). */
2896 insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame)
2898 struct symtab_and_line sr_sal;
2900 /* We shouldn't have gotten here if we don't know where the call site
2902 gdb_assert (frame_id_p (frame_unwind_id (next_frame)));
2904 init_sal (&sr_sal); /* initialize to zeros */
2906 sr_sal.pc = gdbarch_addr_bits_remove
2907 (current_gdbarch, frame_pc_unwind (next_frame));
2908 sr_sal.section = find_pc_overlay (sr_sal.pc);
2910 insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame));
2914 stop_stepping (struct execution_control_state *ecs)
2917 fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n");
2919 /* Let callers know we don't want to wait for the inferior anymore. */
2920 ecs->wait_some_more = 0;
2923 /* This function handles various cases where we need to continue
2924 waiting for the inferior. */
2925 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2928 keep_going (struct execution_control_state *ecs)
2930 /* Save the pc before execution, to compare with pc after stop. */
2931 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2933 /* If we did not do break;, it means we should keep running the
2934 inferior and not return to debugger. */
2936 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2938 /* We took a signal (which we are supposed to pass through to
2939 the inferior, else we'd have done a break above) and we
2940 haven't yet gotten our trap. Simply continue. */
2941 resume (currently_stepping (ecs), stop_signal);
2945 /* Either the trap was not expected, but we are continuing
2946 anyway (the user asked that this signal be passed to the
2949 The signal was SIGTRAP, e.g. it was our signal, but we
2950 decided we should resume from it.
2952 We're going to run this baby now! */
2954 if (!breakpoints_inserted && !ecs->another_trap)
2956 /* Stop stepping when inserting breakpoints
2958 if (insert_breakpoints () != 0)
2960 stop_stepping (ecs);
2963 breakpoints_inserted = 1;
2966 trap_expected = ecs->another_trap;
2968 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2969 specifies that such a signal should be delivered to the
2972 Typically, this would occure when a user is debugging a
2973 target monitor on a simulator: the target monitor sets a
2974 breakpoint; the simulator encounters this break-point and
2975 halts the simulation handing control to GDB; GDB, noteing
2976 that the break-point isn't valid, returns control back to the
2977 simulator; the simulator then delivers the hardware
2978 equivalent of a SIGNAL_TRAP to the program being debugged. */
2980 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2981 stop_signal = TARGET_SIGNAL_0;
2984 resume (currently_stepping (ecs), stop_signal);
2987 prepare_to_wait (ecs);
2990 /* This function normally comes after a resume, before
2991 handle_inferior_event exits. It takes care of any last bits of
2992 housekeeping, and sets the all-important wait_some_more flag. */
2995 prepare_to_wait (struct execution_control_state *ecs)
2998 fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
2999 if (ecs->infwait_state == infwait_normal_state)
3001 overlay_cache_invalid = 1;
3003 /* We have to invalidate the registers BEFORE calling
3004 target_wait because they can be loaded from the target while
3005 in target_wait. This makes remote debugging a bit more
3006 efficient for those targets that provide critical registers
3007 as part of their normal status mechanism. */
3009 registers_changed ();
3010 ecs->waiton_ptid = pid_to_ptid (-1);
3011 ecs->wp = &(ecs->ws);
3013 /* This is the old end of the while loop. Let everybody know we
3014 want to wait for the inferior some more and get called again
3016 ecs->wait_some_more = 1;
3019 /* Print why the inferior has stopped. We always print something when
3020 the inferior exits, or receives a signal. The rest of the cases are
3021 dealt with later on in normal_stop() and print_it_typical(). Ideally
3022 there should be a call to this function from handle_inferior_event()
3023 each time stop_stepping() is called.*/
3025 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
3027 switch (stop_reason)
3029 case END_STEPPING_RANGE:
3030 /* We are done with a step/next/si/ni command. */
3031 /* For now print nothing. */
3032 /* Print a message only if not in the middle of doing a "step n"
3033 operation for n > 1 */
3034 if (!step_multi || !stop_step)
3035 if (ui_out_is_mi_like_p (uiout))
3038 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE));
3041 /* The inferior was terminated by a signal. */
3042 annotate_signalled ();
3043 if (ui_out_is_mi_like_p (uiout))
3046 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED));
3047 ui_out_text (uiout, "\nProgram terminated with signal ");
3048 annotate_signal_name ();
3049 ui_out_field_string (uiout, "signal-name",
3050 target_signal_to_name (stop_info));
3051 annotate_signal_name_end ();
3052 ui_out_text (uiout, ", ");
3053 annotate_signal_string ();
3054 ui_out_field_string (uiout, "signal-meaning",
3055 target_signal_to_string (stop_info));
3056 annotate_signal_string_end ();
3057 ui_out_text (uiout, ".\n");
3058 ui_out_text (uiout, "The program no longer exists.\n");
3061 /* The inferior program is finished. */
3062 annotate_exited (stop_info);
3065 if (ui_out_is_mi_like_p (uiout))
3066 ui_out_field_string (uiout, "reason",
3067 async_reason_lookup (EXEC_ASYNC_EXITED));
3068 ui_out_text (uiout, "\nProgram exited with code ");
3069 ui_out_field_fmt (uiout, "exit-code", "0%o",
3070 (unsigned int) stop_info);
3071 ui_out_text (uiout, ".\n");
3075 if (ui_out_is_mi_like_p (uiout))
3078 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY));
3079 ui_out_text (uiout, "\nProgram exited normally.\n");
3081 /* Support the --return-child-result option. */
3082 return_child_result_value = stop_info;
3084 case SIGNAL_RECEIVED:
3085 /* Signal received. The signal table tells us to print about
3088 ui_out_text (uiout, "\nProgram received signal ");
3089 annotate_signal_name ();
3090 if (ui_out_is_mi_like_p (uiout))
3092 (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED));
3093 ui_out_field_string (uiout, "signal-name",
3094 target_signal_to_name (stop_info));
3095 annotate_signal_name_end ();
3096 ui_out_text (uiout, ", ");
3097 annotate_signal_string ();
3098 ui_out_field_string (uiout, "signal-meaning",
3099 target_signal_to_string (stop_info));
3100 annotate_signal_string_end ();
3101 ui_out_text (uiout, ".\n");
3104 internal_error (__FILE__, __LINE__,
3105 _("print_stop_reason: unrecognized enum value"));
3111 /* Here to return control to GDB when the inferior stops for real.
3112 Print appropriate messages, remove breakpoints, give terminal our modes.
3114 STOP_PRINT_FRAME nonzero means print the executing frame
3115 (pc, function, args, file, line number and line text).
3116 BREAKPOINTS_FAILED nonzero means stop was due to error
3117 attempting to insert breakpoints. */
3122 struct target_waitstatus last;
3125 get_last_target_status (&last_ptid, &last);
3127 /* As with the notification of thread events, we want to delay
3128 notifying the user that we've switched thread context until
3129 the inferior actually stops.
3131 There's no point in saying anything if the inferior has exited.
3132 Note that SIGNALLED here means "exited with a signal", not
3133 "received a signal". */
3134 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
3135 && target_has_execution
3136 && last.kind != TARGET_WAITKIND_SIGNALLED
3137 && last.kind != TARGET_WAITKIND_EXITED)
3139 target_terminal_ours_for_output ();
3140 printf_filtered (_("[Switching to %s]\n"),
3141 target_pid_or_tid_to_str (inferior_ptid));
3142 previous_inferior_ptid = inferior_ptid;
3145 /* NOTE drow/2004-01-17: Is this still necessary? */
3146 /* Make sure that the current_frame's pc is correct. This
3147 is a correction for setting up the frame info before doing
3148 gdbarch_decr_pc_after_break */
3149 if (target_has_execution)
3150 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3151 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3152 frame code to check for this and sort out any resultant mess.
3153 gdbarch_decr_pc_after_break needs to just go away. */
3154 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3156 if (target_has_execution && breakpoints_inserted)
3158 if (remove_breakpoints ())
3160 target_terminal_ours_for_output ();
3161 printf_filtered (_("\
3162 Cannot remove breakpoints because program is no longer writable.\n\
3163 It might be running in another process.\n\
3164 Further execution is probably impossible.\n"));
3167 breakpoints_inserted = 0;
3169 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3170 Delete any breakpoint that is to be deleted at the next stop. */
3172 breakpoint_auto_delete (stop_bpstat);
3174 /* If an auto-display called a function and that got a signal,
3175 delete that auto-display to avoid an infinite recursion. */
3177 if (stopped_by_random_signal)
3178 disable_current_display ();
3180 /* Don't print a message if in the middle of doing a "step n"
3181 operation for n > 1 */
3182 if (step_multi && stop_step)
3185 target_terminal_ours ();
3187 /* Set the current source location. This will also happen if we
3188 display the frame below, but the current SAL will be incorrect
3189 during a user hook-stop function. */
3190 if (target_has_stack && !stop_stack_dummy)
3191 set_current_sal_from_frame (get_current_frame (), 1);
3193 /* Look up the hook_stop and run it (CLI internally handles problem
3194 of stop_command's pre-hook not existing). */
3196 catch_errors (hook_stop_stub, stop_command,
3197 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3199 if (!target_has_stack)
3205 /* Select innermost stack frame - i.e., current frame is frame 0,
3206 and current location is based on that.
3207 Don't do this on return from a stack dummy routine,
3208 or if the program has exited. */
3210 if (!stop_stack_dummy)
3212 select_frame (get_current_frame ());
3214 /* Print current location without a level number, if
3215 we have changed functions or hit a breakpoint.
3216 Print source line if we have one.
3217 bpstat_print() contains the logic deciding in detail
3218 what to print, based on the event(s) that just occurred. */
3220 if (stop_print_frame)
3224 int do_frame_printing = 1;
3226 bpstat_ret = bpstat_print (stop_bpstat);
3230 /* If we had hit a shared library event breakpoint,
3231 bpstat_print would print out this message. If we hit
3232 an OS-level shared library event, do the same
3234 if (last.kind == TARGET_WAITKIND_LOADED)
3236 printf_filtered (_("Stopped due to shared library event\n"));
3237 source_flag = SRC_LINE; /* something bogus */
3238 do_frame_printing = 0;
3242 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3243 (or should) carry around the function and does (or
3244 should) use that when doing a frame comparison. */
3246 && frame_id_eq (step_frame_id,
3247 get_frame_id (get_current_frame ()))
3248 && step_start_function == find_pc_function (stop_pc))
3249 source_flag = SRC_LINE; /* finished step, just print source line */
3251 source_flag = SRC_AND_LOC; /* print location and source line */
3253 case PRINT_SRC_AND_LOC:
3254 source_flag = SRC_AND_LOC; /* print location and source line */
3256 case PRINT_SRC_ONLY:
3257 source_flag = SRC_LINE;
3260 source_flag = SRC_LINE; /* something bogus */
3261 do_frame_printing = 0;
3264 internal_error (__FILE__, __LINE__, _("Unknown value."));
3267 if (ui_out_is_mi_like_p (uiout))
3268 ui_out_field_int (uiout, "thread-id",
3269 pid_to_thread_id (inferior_ptid));
3270 /* The behavior of this routine with respect to the source
3272 SRC_LINE: Print only source line
3273 LOCATION: Print only location
3274 SRC_AND_LOC: Print location and source line */
3275 if (do_frame_printing)
3276 print_stack_frame (get_selected_frame (NULL), 0, source_flag);
3278 /* Display the auto-display expressions. */
3283 /* Save the function value return registers, if we care.
3284 We might be about to restore their previous contents. */
3285 if (proceed_to_finish)
3287 /* This should not be necessary. */
3289 regcache_xfree (stop_registers);
3291 /* NB: The copy goes through to the target picking up the value of
3292 all the registers. */
3293 stop_registers = regcache_dup (get_current_regcache ());
3296 if (stop_stack_dummy)
3298 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3299 ends with a setting of the current frame, so we can use that
3301 frame_pop (get_current_frame ());
3302 /* Set stop_pc to what it was before we called the function.
3303 Can't rely on restore_inferior_status because that only gets
3304 called if we don't stop in the called function. */
3305 stop_pc = read_pc ();
3306 select_frame (get_current_frame ());
3310 annotate_stopped ();
3311 observer_notify_normal_stop (stop_bpstat);
3315 hook_stop_stub (void *cmd)
3317 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3322 signal_stop_state (int signo)
3324 return signal_stop[signo];
3328 signal_print_state (int signo)
3330 return signal_print[signo];
3334 signal_pass_state (int signo)
3336 return signal_program[signo];
3340 signal_stop_update (int signo, int state)
3342 int ret = signal_stop[signo];
3343 signal_stop[signo] = state;
3348 signal_print_update (int signo, int state)
3350 int ret = signal_print[signo];
3351 signal_print[signo] = state;
3356 signal_pass_update (int signo, int state)
3358 int ret = signal_program[signo];
3359 signal_program[signo] = state;
3364 sig_print_header (void)
3366 printf_filtered (_("\
3367 Signal Stop\tPrint\tPass to program\tDescription\n"));
3371 sig_print_info (enum target_signal oursig)
3373 char *name = target_signal_to_name (oursig);
3374 int name_padding = 13 - strlen (name);
3376 if (name_padding <= 0)
3379 printf_filtered ("%s", name);
3380 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3381 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3382 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3383 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3384 printf_filtered ("%s\n", target_signal_to_string (oursig));
3387 /* Specify how various signals in the inferior should be handled. */
3390 handle_command (char *args, int from_tty)
3393 int digits, wordlen;
3394 int sigfirst, signum, siglast;
3395 enum target_signal oursig;
3398 unsigned char *sigs;
3399 struct cleanup *old_chain;
3403 error_no_arg (_("signal to handle"));
3406 /* Allocate and zero an array of flags for which signals to handle. */
3408 nsigs = (int) TARGET_SIGNAL_LAST;
3409 sigs = (unsigned char *) alloca (nsigs);
3410 memset (sigs, 0, nsigs);
3412 /* Break the command line up into args. */
3414 argv = buildargv (args);
3419 old_chain = make_cleanup_freeargv (argv);
3421 /* Walk through the args, looking for signal oursigs, signal names, and
3422 actions. Signal numbers and signal names may be interspersed with
3423 actions, with the actions being performed for all signals cumulatively
3424 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3426 while (*argv != NULL)
3428 wordlen = strlen (*argv);
3429 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3433 sigfirst = siglast = -1;
3435 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3437 /* Apply action to all signals except those used by the
3438 debugger. Silently skip those. */
3441 siglast = nsigs - 1;
3443 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3445 SET_SIGS (nsigs, sigs, signal_stop);
3446 SET_SIGS (nsigs, sigs, signal_print);
3448 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3450 UNSET_SIGS (nsigs, sigs, signal_program);
3452 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3454 SET_SIGS (nsigs, sigs, signal_print);
3456 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3458 SET_SIGS (nsigs, sigs, signal_program);
3460 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3462 UNSET_SIGS (nsigs, sigs, signal_stop);
3464 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3466 SET_SIGS (nsigs, sigs, signal_program);
3468 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3470 UNSET_SIGS (nsigs, sigs, signal_print);
3471 UNSET_SIGS (nsigs, sigs, signal_stop);
3473 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3475 UNSET_SIGS (nsigs, sigs, signal_program);
3477 else if (digits > 0)
3479 /* It is numeric. The numeric signal refers to our own
3480 internal signal numbering from target.h, not to host/target
3481 signal number. This is a feature; users really should be
3482 using symbolic names anyway, and the common ones like
3483 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3485 sigfirst = siglast = (int)
3486 target_signal_from_command (atoi (*argv));
3487 if ((*argv)[digits] == '-')
3490 target_signal_from_command (atoi ((*argv) + digits + 1));
3492 if (sigfirst > siglast)
3494 /* Bet he didn't figure we'd think of this case... */
3502 oursig = target_signal_from_name (*argv);
3503 if (oursig != TARGET_SIGNAL_UNKNOWN)
3505 sigfirst = siglast = (int) oursig;
3509 /* Not a number and not a recognized flag word => complain. */
3510 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv);
3514 /* If any signal numbers or symbol names were found, set flags for
3515 which signals to apply actions to. */
3517 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3519 switch ((enum target_signal) signum)
3521 case TARGET_SIGNAL_TRAP:
3522 case TARGET_SIGNAL_INT:
3523 if (!allsigs && !sigs[signum])
3525 if (query ("%s is used by the debugger.\n\
3526 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3532 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3533 gdb_flush (gdb_stdout);
3537 case TARGET_SIGNAL_0:
3538 case TARGET_SIGNAL_DEFAULT:
3539 case TARGET_SIGNAL_UNKNOWN:
3540 /* Make sure that "all" doesn't print these. */
3551 target_notice_signals (inferior_ptid);
3555 /* Show the results. */
3556 sig_print_header ();
3557 for (signum = 0; signum < nsigs; signum++)
3561 sig_print_info (signum);
3566 do_cleanups (old_chain);
3570 xdb_handle_command (char *args, int from_tty)
3573 struct cleanup *old_chain;
3575 /* Break the command line up into args. */
3577 argv = buildargv (args);
3582 old_chain = make_cleanup_freeargv (argv);
3583 if (argv[1] != (char *) NULL)
3588 bufLen = strlen (argv[0]) + 20;
3589 argBuf = (char *) xmalloc (bufLen);
3593 enum target_signal oursig;
3595 oursig = target_signal_from_name (argv[0]);
3596 memset (argBuf, 0, bufLen);
3597 if (strcmp (argv[1], "Q") == 0)
3598 sprintf (argBuf, "%s %s", argv[0], "noprint");
3601 if (strcmp (argv[1], "s") == 0)
3603 if (!signal_stop[oursig])
3604 sprintf (argBuf, "%s %s", argv[0], "stop");
3606 sprintf (argBuf, "%s %s", argv[0], "nostop");
3608 else if (strcmp (argv[1], "i") == 0)
3610 if (!signal_program[oursig])
3611 sprintf (argBuf, "%s %s", argv[0], "pass");
3613 sprintf (argBuf, "%s %s", argv[0], "nopass");
3615 else if (strcmp (argv[1], "r") == 0)
3617 if (!signal_print[oursig])
3618 sprintf (argBuf, "%s %s", argv[0], "print");
3620 sprintf (argBuf, "%s %s", argv[0], "noprint");
3626 handle_command (argBuf, from_tty);
3628 printf_filtered (_("Invalid signal handling flag.\n"));
3633 do_cleanups (old_chain);
3636 /* Print current contents of the tables set by the handle command.
3637 It is possible we should just be printing signals actually used
3638 by the current target (but for things to work right when switching
3639 targets, all signals should be in the signal tables). */
3642 signals_info (char *signum_exp, int from_tty)
3644 enum target_signal oursig;
3645 sig_print_header ();
3649 /* First see if this is a symbol name. */
3650 oursig = target_signal_from_name (signum_exp);
3651 if (oursig == TARGET_SIGNAL_UNKNOWN)
3653 /* No, try numeric. */
3655 target_signal_from_command (parse_and_eval_long (signum_exp));
3657 sig_print_info (oursig);
3661 printf_filtered ("\n");
3662 /* These ugly casts brought to you by the native VAX compiler. */
3663 for (oursig = TARGET_SIGNAL_FIRST;
3664 (int) oursig < (int) TARGET_SIGNAL_LAST;
3665 oursig = (enum target_signal) ((int) oursig + 1))
3669 if (oursig != TARGET_SIGNAL_UNKNOWN
3670 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3671 sig_print_info (oursig);
3674 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3677 struct inferior_status
3679 enum target_signal stop_signal;
3683 int stop_stack_dummy;
3684 int stopped_by_random_signal;
3686 CORE_ADDR step_range_start;
3687 CORE_ADDR step_range_end;
3688 struct frame_id step_frame_id;
3689 enum step_over_calls_kind step_over_calls;
3690 CORE_ADDR step_resume_break_address;
3691 int stop_after_trap;
3694 /* These are here because if call_function_by_hand has written some
3695 registers and then decides to call error(), we better not have changed
3697 struct regcache *registers;
3699 /* A frame unique identifier. */
3700 struct frame_id selected_frame_id;
3702 int breakpoint_proceeded;
3703 int restore_stack_info;
3704 int proceed_to_finish;
3708 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3711 int size = register_size (current_gdbarch, regno);
3712 void *buf = alloca (size);
3713 store_signed_integer (buf, size, val);
3714 regcache_raw_write (inf_status->registers, regno, buf);
3717 /* Save all of the information associated with the inferior<==>gdb
3718 connection. INF_STATUS is a pointer to a "struct inferior_status"
3719 (defined in inferior.h). */
3721 struct inferior_status *
3722 save_inferior_status (int restore_stack_info)
3724 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3726 inf_status->stop_signal = stop_signal;
3727 inf_status->stop_pc = stop_pc;
3728 inf_status->stop_step = stop_step;
3729 inf_status->stop_stack_dummy = stop_stack_dummy;
3730 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3731 inf_status->trap_expected = trap_expected;
3732 inf_status->step_range_start = step_range_start;
3733 inf_status->step_range_end = step_range_end;
3734 inf_status->step_frame_id = step_frame_id;
3735 inf_status->step_over_calls = step_over_calls;
3736 inf_status->stop_after_trap = stop_after_trap;
3737 inf_status->stop_soon = stop_soon;
3738 /* Save original bpstat chain here; replace it with copy of chain.
3739 If caller's caller is walking the chain, they'll be happier if we
3740 hand them back the original chain when restore_inferior_status is
3742 inf_status->stop_bpstat = stop_bpstat;
3743 stop_bpstat = bpstat_copy (stop_bpstat);
3744 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3745 inf_status->restore_stack_info = restore_stack_info;
3746 inf_status->proceed_to_finish = proceed_to_finish;
3748 inf_status->registers = regcache_dup (get_current_regcache ());
3750 inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL));
3755 restore_selected_frame (void *args)
3757 struct frame_id *fid = (struct frame_id *) args;
3758 struct frame_info *frame;
3760 frame = frame_find_by_id (*fid);
3762 /* If inf_status->selected_frame_id is NULL, there was no previously
3766 warning (_("Unable to restore previously selected frame."));
3770 select_frame (frame);
3776 restore_inferior_status (struct inferior_status *inf_status)
3778 stop_signal = inf_status->stop_signal;
3779 stop_pc = inf_status->stop_pc;
3780 stop_step = inf_status->stop_step;
3781 stop_stack_dummy = inf_status->stop_stack_dummy;
3782 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3783 trap_expected = inf_status->trap_expected;
3784 step_range_start = inf_status->step_range_start;
3785 step_range_end = inf_status->step_range_end;
3786 step_frame_id = inf_status->step_frame_id;
3787 step_over_calls = inf_status->step_over_calls;
3788 stop_after_trap = inf_status->stop_after_trap;
3789 stop_soon = inf_status->stop_soon;
3790 bpstat_clear (&stop_bpstat);
3791 stop_bpstat = inf_status->stop_bpstat;
3792 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3793 proceed_to_finish = inf_status->proceed_to_finish;
3795 /* The inferior can be gone if the user types "print exit(0)"
3796 (and perhaps other times). */
3797 if (target_has_execution)
3798 /* NB: The register write goes through to the target. */
3799 regcache_cpy (get_current_regcache (), inf_status->registers);
3800 regcache_xfree (inf_status->registers);
3802 /* FIXME: If we are being called after stopping in a function which
3803 is called from gdb, we should not be trying to restore the
3804 selected frame; it just prints a spurious error message (The
3805 message is useful, however, in detecting bugs in gdb (like if gdb
3806 clobbers the stack)). In fact, should we be restoring the
3807 inferior status at all in that case? . */
3809 if (target_has_stack && inf_status->restore_stack_info)
3811 /* The point of catch_errors is that if the stack is clobbered,
3812 walking the stack might encounter a garbage pointer and
3813 error() trying to dereference it. */
3815 (restore_selected_frame, &inf_status->selected_frame_id,
3816 "Unable to restore previously selected frame:\n",
3817 RETURN_MASK_ERROR) == 0)
3818 /* Error in restoring the selected frame. Select the innermost
3820 select_frame (get_current_frame ());
3828 do_restore_inferior_status_cleanup (void *sts)
3830 restore_inferior_status (sts);
3834 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3836 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3840 discard_inferior_status (struct inferior_status *inf_status)
3842 /* See save_inferior_status for info on stop_bpstat. */
3843 bpstat_clear (&inf_status->stop_bpstat);
3844 regcache_xfree (inf_status->registers);
3849 inferior_has_forked (int pid, int *child_pid)
3851 struct target_waitstatus last;
3854 get_last_target_status (&last_ptid, &last);
3856 if (last.kind != TARGET_WAITKIND_FORKED)
3859 if (ptid_get_pid (last_ptid) != pid)
3862 *child_pid = last.value.related_pid;
3867 inferior_has_vforked (int pid, int *child_pid)
3869 struct target_waitstatus last;
3872 get_last_target_status (&last_ptid, &last);
3874 if (last.kind != TARGET_WAITKIND_VFORKED)
3877 if (ptid_get_pid (last_ptid) != pid)
3880 *child_pid = last.value.related_pid;
3885 inferior_has_execd (int pid, char **execd_pathname)
3887 struct target_waitstatus last;
3890 get_last_target_status (&last_ptid, &last);
3892 if (last.kind != TARGET_WAITKIND_EXECD)
3895 if (ptid_get_pid (last_ptid) != pid)
3898 *execd_pathname = xstrdup (last.value.execd_pathname);
3902 /* Oft used ptids */
3904 ptid_t minus_one_ptid;
3906 /* Create a ptid given the necessary PID, LWP, and TID components. */
3909 ptid_build (int pid, long lwp, long tid)
3919 /* Create a ptid from just a pid. */
3922 pid_to_ptid (int pid)
3924 return ptid_build (pid, 0, 0);
3927 /* Fetch the pid (process id) component from a ptid. */
3930 ptid_get_pid (ptid_t ptid)
3935 /* Fetch the lwp (lightweight process) component from a ptid. */
3938 ptid_get_lwp (ptid_t ptid)
3943 /* Fetch the tid (thread id) component from a ptid. */
3946 ptid_get_tid (ptid_t ptid)
3951 /* ptid_equal() is used to test equality of two ptids. */
3954 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3956 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3957 && ptid1.tid == ptid2.tid);
3960 /* restore_inferior_ptid() will be used by the cleanup machinery
3961 to restore the inferior_ptid value saved in a call to
3962 save_inferior_ptid(). */
3965 restore_inferior_ptid (void *arg)
3967 ptid_t *saved_ptid_ptr = arg;
3968 inferior_ptid = *saved_ptid_ptr;
3972 /* Save the value of inferior_ptid so that it may be restored by a
3973 later call to do_cleanups(). Returns the struct cleanup pointer
3974 needed for later doing the cleanup. */
3977 save_inferior_ptid (void)
3979 ptid_t *saved_ptid_ptr;
3981 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3982 *saved_ptid_ptr = inferior_ptid;
3983 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3988 _initialize_infrun (void)
3992 struct cmd_list_element *c;
3994 add_info ("signals", signals_info, _("\
3995 What debugger does when program gets various signals.\n\
3996 Specify a signal as argument to print info on that signal only."));
3997 add_info_alias ("handle", "signals", 0);
3999 add_com ("handle", class_run, handle_command, _("\
4000 Specify how to handle a signal.\n\
4001 Args are signals and actions to apply to those signals.\n\
4002 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4003 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4004 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4005 The special arg \"all\" is recognized to mean all signals except those\n\
4006 used by the debugger, typically SIGTRAP and SIGINT.\n\
4007 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4008 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4009 Stop means reenter debugger if this signal happens (implies print).\n\
4010 Print means print a message if this signal happens.\n\
4011 Pass means let program see this signal; otherwise program doesn't know.\n\
4012 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4013 Pass and Stop may be combined."));
4016 add_com ("lz", class_info, signals_info, _("\
4017 What debugger does when program gets various signals.\n\
4018 Specify a signal as argument to print info on that signal only."));
4019 add_com ("z", class_run, xdb_handle_command, _("\
4020 Specify how to handle a signal.\n\
4021 Args are signals and actions to apply to those signals.\n\
4022 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4023 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4024 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4025 The special arg \"all\" is recognized to mean all signals except those\n\
4026 used by the debugger, typically SIGTRAP and SIGINT.\n\
4027 Recognized actions include \"s\" (toggles between stop and nostop), \n\
4028 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4029 nopass), \"Q\" (noprint)\n\
4030 Stop means reenter debugger if this signal happens (implies print).\n\
4031 Print means print a message if this signal happens.\n\
4032 Pass means let program see this signal; otherwise program doesn't know.\n\
4033 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4034 Pass and Stop may be combined."));
4038 stop_command = add_cmd ("stop", class_obscure,
4039 not_just_help_class_command, _("\
4040 There is no `stop' command, but you can set a hook on `stop'.\n\
4041 This allows you to set a list of commands to be run each time execution\n\
4042 of the program stops."), &cmdlist);
4044 add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\
4045 Set inferior debugging."), _("\
4046 Show inferior debugging."), _("\
4047 When non-zero, inferior specific debugging is enabled."),
4050 &setdebuglist, &showdebuglist);
4052 numsigs = (int) TARGET_SIGNAL_LAST;
4053 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
4054 signal_print = (unsigned char *)
4055 xmalloc (sizeof (signal_print[0]) * numsigs);
4056 signal_program = (unsigned char *)
4057 xmalloc (sizeof (signal_program[0]) * numsigs);
4058 for (i = 0; i < numsigs; i++)
4061 signal_print[i] = 1;
4062 signal_program[i] = 1;
4065 /* Signals caused by debugger's own actions
4066 should not be given to the program afterwards. */
4067 signal_program[TARGET_SIGNAL_TRAP] = 0;
4068 signal_program[TARGET_SIGNAL_INT] = 0;
4070 /* Signals that are not errors should not normally enter the debugger. */
4071 signal_stop[TARGET_SIGNAL_ALRM] = 0;
4072 signal_print[TARGET_SIGNAL_ALRM] = 0;
4073 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
4074 signal_print[TARGET_SIGNAL_VTALRM] = 0;
4075 signal_stop[TARGET_SIGNAL_PROF] = 0;
4076 signal_print[TARGET_SIGNAL_PROF] = 0;
4077 signal_stop[TARGET_SIGNAL_CHLD] = 0;
4078 signal_print[TARGET_SIGNAL_CHLD] = 0;
4079 signal_stop[TARGET_SIGNAL_IO] = 0;
4080 signal_print[TARGET_SIGNAL_IO] = 0;
4081 signal_stop[TARGET_SIGNAL_POLL] = 0;
4082 signal_print[TARGET_SIGNAL_POLL] = 0;
4083 signal_stop[TARGET_SIGNAL_URG] = 0;
4084 signal_print[TARGET_SIGNAL_URG] = 0;
4085 signal_stop[TARGET_SIGNAL_WINCH] = 0;
4086 signal_print[TARGET_SIGNAL_WINCH] = 0;
4088 /* These signals are used internally by user-level thread
4089 implementations. (See signal(5) on Solaris.) Like the above
4090 signals, a healthy program receives and handles them as part of
4091 its normal operation. */
4092 signal_stop[TARGET_SIGNAL_LWP] = 0;
4093 signal_print[TARGET_SIGNAL_LWP] = 0;
4094 signal_stop[TARGET_SIGNAL_WAITING] = 0;
4095 signal_print[TARGET_SIGNAL_WAITING] = 0;
4096 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4097 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4099 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support,
4100 &stop_on_solib_events, _("\
4101 Set stopping for shared library events."), _("\
4102 Show stopping for shared library events."), _("\
4103 If nonzero, gdb will give control to the user when the dynamic linker\n\
4104 notifies gdb of shared library events. The most common event of interest\n\
4105 to the user would be loading/unloading of a new library."),
4107 show_stop_on_solib_events,
4108 &setlist, &showlist);
4110 add_setshow_enum_cmd ("follow-fork-mode", class_run,
4111 follow_fork_mode_kind_names,
4112 &follow_fork_mode_string, _("\
4113 Set debugger response to a program call of fork or vfork."), _("\
4114 Show debugger response to a program call of fork or vfork."), _("\
4115 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4116 parent - the original process is debugged after a fork\n\
4117 child - the new process is debugged after a fork\n\
4118 The unfollowed process will continue to run.\n\
4119 By default, the debugger will follow the parent process."),
4121 show_follow_fork_mode_string,
4122 &setlist, &showlist);
4124 add_setshow_enum_cmd ("scheduler-locking", class_run,
4125 scheduler_enums, &scheduler_mode, _("\
4126 Set mode for locking scheduler during execution."), _("\
4127 Show mode for locking scheduler during execution."), _("\
4128 off == no locking (threads may preempt at any time)\n\
4129 on == full locking (no thread except the current thread may run)\n\
4130 step == scheduler locked during every single-step operation.\n\
4131 In this mode, no other thread may run during a step command.\n\
4132 Other threads may run while stepping over a function call ('next')."),
4133 set_schedlock_func, /* traps on target vector */
4134 show_scheduler_mode,
4135 &setlist, &showlist);
4137 add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\
4138 Set mode of the step operation."), _("\
4139 Show mode of the step operation."), _("\
4140 When set, doing a step over a function without debug line information\n\
4141 will stop at the first instruction of that function. Otherwise, the\n\
4142 function is skipped and the step command stops at a different source line."),
4144 show_step_stop_if_no_debug,
4145 &setlist, &showlist);
4147 /* ptid initializations */
4148 null_ptid = ptid_build (0, 0, 0);
4149 minus_one_ptid = ptid_build (-1, 0, 0);
4150 inferior_ptid = null_ptid;
4151 target_last_wait_ptid = minus_one_ptid;