1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
6 Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
31 #include "exceptions.h"
32 #include "breakpoint.h"
36 #include "cli/cli-script.h"
38 #include "gdbthread.h"
48 #include "gdb_assert.h"
50 /* Prototypes for local functions */
52 static void signals_info (char *, int);
54 static void handle_command (char *, int);
56 static void sig_print_info (enum target_signal);
58 static void sig_print_header (void);
60 static void resume_cleanups (void *);
62 static int hook_stop_stub (void *);
64 static int restore_selected_frame (void *);
66 static void build_infrun (void);
68 static int follow_fork (void);
70 static void set_schedlock_func (char *args, int from_tty,
71 struct cmd_list_element *c);
73 struct execution_control_state;
75 static int currently_stepping (struct execution_control_state *ecs);
77 static void xdb_handle_command (char *args, int from_tty);
79 static int prepare_to_proceed (void);
81 void _initialize_infrun (void);
83 int inferior_ignoring_startup_exec_events = 0;
84 int inferior_ignoring_leading_exec_events = 0;
86 /* When set, stop the 'step' command if we enter a function which has
87 no line number information. The normal behavior is that we step
88 over such function. */
89 int step_stop_if_no_debug = 0;
91 /* In asynchronous mode, but simulating synchronous execution. */
93 int sync_execution = 0;
95 /* wait_for_inferior and normal_stop use this to notify the user
96 when the inferior stopped in a different thread than it had been
99 static ptid_t previous_inferior_ptid;
101 /* This is true for configurations that may follow through execl() and
102 similar functions. At present this is only true for HP-UX native. */
104 #ifndef MAY_FOLLOW_EXEC
105 #define MAY_FOLLOW_EXEC (0)
108 static int may_follow_exec = MAY_FOLLOW_EXEC;
110 static int debug_infrun = 0;
112 /* If the program uses ELF-style shared libraries, then calls to
113 functions in shared libraries go through stubs, which live in a
114 table called the PLT (Procedure Linkage Table). The first time the
115 function is called, the stub sends control to the dynamic linker,
116 which looks up the function's real address, patches the stub so
117 that future calls will go directly to the function, and then passes
118 control to the function.
120 If we are stepping at the source level, we don't want to see any of
121 this --- we just want to skip over the stub and the dynamic linker.
122 The simple approach is to single-step until control leaves the
125 However, on some systems (e.g., Red Hat's 5.2 distribution) the
126 dynamic linker calls functions in the shared C library, so you
127 can't tell from the PC alone whether the dynamic linker is still
128 running. In this case, we use a step-resume breakpoint to get us
129 past the dynamic linker, as if we were using "next" to step over a
132 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
133 linker code or not. Normally, this means we single-step. However,
134 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
135 address where we can place a step-resume breakpoint to get past the
136 linker's symbol resolution function.
138 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
139 pretty portable way, by comparing the PC against the address ranges
140 of the dynamic linker's sections.
142 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
143 it depends on internal details of the dynamic linker. It's usually
144 not too hard to figure out where to put a breakpoint, but it
145 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
146 sanity checking. If it can't figure things out, returning zero and
147 getting the (possibly confusing) stepping behavior is better than
148 signalling an error, which will obscure the change in the
151 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
152 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
155 /* This function returns TRUE if pc is the address of an instruction
156 that lies within the dynamic linker (such as the event hook, or the
159 This function must be used only when a dynamic linker event has
160 been caught, and the inferior is being stepped out of the hook, or
161 undefined results are guaranteed. */
163 #ifndef SOLIB_IN_DYNAMIC_LINKER
164 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
167 /* We can't step off a permanent breakpoint in the ordinary way, because we
168 can't remove it. Instead, we have to advance the PC to the next
169 instruction. This macro should expand to a pointer to a function that
170 does that, or zero if we have no such function. If we don't have a
171 definition for it, we have to report an error. */
172 #ifndef SKIP_PERMANENT_BREAKPOINT
173 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
175 default_skip_permanent_breakpoint (void)
178 The program is stopped at a permanent breakpoint, but GDB does not know\n\
179 how to step past a permanent breakpoint on this architecture. Try using\n\
180 a command like `return' or `jump' to continue execution."));
185 /* Convert the #defines into values. This is temporary until wfi control
186 flow is completely sorted out. */
188 #ifndef HAVE_STEPPABLE_WATCHPOINT
189 #define HAVE_STEPPABLE_WATCHPOINT 0
191 #undef HAVE_STEPPABLE_WATCHPOINT
192 #define HAVE_STEPPABLE_WATCHPOINT 1
195 #ifndef CANNOT_STEP_HW_WATCHPOINTS
196 #define CANNOT_STEP_HW_WATCHPOINTS 0
198 #undef CANNOT_STEP_HW_WATCHPOINTS
199 #define CANNOT_STEP_HW_WATCHPOINTS 1
202 /* Tables of how to react to signals; the user sets them. */
204 static unsigned char *signal_stop;
205 static unsigned char *signal_print;
206 static unsigned char *signal_program;
208 #define SET_SIGS(nsigs,sigs,flags) \
210 int signum = (nsigs); \
211 while (signum-- > 0) \
212 if ((sigs)[signum]) \
213 (flags)[signum] = 1; \
216 #define UNSET_SIGS(nsigs,sigs,flags) \
218 int signum = (nsigs); \
219 while (signum-- > 0) \
220 if ((sigs)[signum]) \
221 (flags)[signum] = 0; \
224 /* Value to pass to target_resume() to cause all threads to resume */
226 #define RESUME_ALL (pid_to_ptid (-1))
228 /* Command list pointer for the "stop" placeholder. */
230 static struct cmd_list_element *stop_command;
232 /* Nonzero if breakpoints are now inserted in the inferior. */
234 static int breakpoints_inserted;
236 /* Function inferior was in as of last step command. */
238 static struct symbol *step_start_function;
240 /* Nonzero if we are expecting a trace trap and should proceed from it. */
242 static int trap_expected;
245 /* Nonzero if we want to give control to the user when we're notified
246 of shared library events by the dynamic linker. */
247 static int stop_on_solib_events;
250 /* Nonzero means expecting a trace trap
251 and should stop the inferior and return silently when it happens. */
255 /* Nonzero means expecting a trap and caller will handle it themselves.
256 It is used after attach, due to attaching to a process;
257 when running in the shell before the child program has been exec'd;
258 and when running some kinds of remote stuff (FIXME?). */
260 enum stop_kind stop_soon;
262 /* Nonzero if proceed is being used for a "finish" command or a similar
263 situation when stop_registers should be saved. */
265 int proceed_to_finish;
267 /* Save register contents here when about to pop a stack dummy frame,
268 if-and-only-if proceed_to_finish is set.
269 Thus this contains the return value from the called function (assuming
270 values are returned in a register). */
272 struct regcache *stop_registers;
274 /* Nonzero if program stopped due to error trying to insert breakpoints. */
276 static int breakpoints_failed;
278 /* Nonzero after stop if current stack frame should be printed. */
280 static int stop_print_frame;
282 static struct breakpoint *step_resume_breakpoint = NULL;
284 /* This is a cached copy of the pid/waitstatus of the last event
285 returned by target_wait()/deprecated_target_wait_hook(). This
286 information is returned by get_last_target_status(). */
287 static ptid_t target_last_wait_ptid;
288 static struct target_waitstatus target_last_waitstatus;
290 /* This is used to remember when a fork, vfork or exec event
291 was caught by a catchpoint, and thus the event is to be
292 followed at the next resume of the inferior, and not
296 enum target_waitkind kind;
303 char *execd_pathname;
307 static const char follow_fork_mode_child[] = "child";
308 static const char follow_fork_mode_parent[] = "parent";
310 static const char *follow_fork_mode_kind_names[] = {
311 follow_fork_mode_child,
312 follow_fork_mode_parent,
316 static const char *follow_fork_mode_string = follow_fork_mode_parent;
322 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
324 return target_follow_fork (follow_child);
328 follow_inferior_reset_breakpoints (void)
330 /* Was there a step_resume breakpoint? (There was if the user
331 did a "next" at the fork() call.) If so, explicitly reset its
334 step_resumes are a form of bp that are made to be per-thread.
335 Since we created the step_resume bp when the parent process
336 was being debugged, and now are switching to the child process,
337 from the breakpoint package's viewpoint, that's a switch of
338 "threads". We must update the bp's notion of which thread
339 it is for, or it'll be ignored when it triggers. */
341 if (step_resume_breakpoint)
342 breakpoint_re_set_thread (step_resume_breakpoint);
344 /* Reinsert all breakpoints in the child. The user may have set
345 breakpoints after catching the fork, in which case those
346 were never set in the child, but only in the parent. This makes
347 sure the inserted breakpoints match the breakpoint list. */
349 breakpoint_re_set ();
350 insert_breakpoints ();
353 /* EXECD_PATHNAME is assumed to be non-NULL. */
356 follow_exec (int pid, char *execd_pathname)
359 struct target_ops *tgt;
361 if (!may_follow_exec)
364 /* This is an exec event that we actually wish to pay attention to.
365 Refresh our symbol table to the newly exec'd program, remove any
368 If there are breakpoints, they aren't really inserted now,
369 since the exec() transformed our inferior into a fresh set
372 We want to preserve symbolic breakpoints on the list, since
373 we have hopes that they can be reset after the new a.out's
374 symbol table is read.
376 However, any "raw" breakpoints must be removed from the list
377 (e.g., the solib bp's), since their address is probably invalid
380 And, we DON'T want to call delete_breakpoints() here, since
381 that may write the bp's "shadow contents" (the instruction
382 value that was overwritten witha TRAP instruction). Since
383 we now have a new a.out, those shadow contents aren't valid. */
384 update_breakpoints_after_exec ();
386 /* If there was one, it's gone now. We cannot truly step-to-next
387 statement through an exec(). */
388 step_resume_breakpoint = NULL;
389 step_range_start = 0;
392 /* What is this a.out's name? */
393 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname);
395 /* We've followed the inferior through an exec. Therefore, the
396 inferior has essentially been killed & reborn. */
398 /* First collect the run target in effect. */
399 tgt = find_run_target ();
400 /* If we can't find one, things are in a very strange state... */
402 error (_("Could find run target to save before following exec"));
404 gdb_flush (gdb_stdout);
405 target_mourn_inferior ();
406 inferior_ptid = pid_to_ptid (saved_pid);
407 /* Because mourn_inferior resets inferior_ptid. */
410 /* That a.out is now the one to use. */
411 exec_file_attach (execd_pathname, 0);
413 /* And also is where symbols can be found. */
414 symbol_file_add_main (execd_pathname, 0);
416 /* Reset the shared library package. This ensures that we get
417 a shlib event when the child reaches "_start", at which point
418 the dld will have had a chance to initialize the child. */
419 #if defined(SOLIB_RESTART)
422 #ifdef SOLIB_CREATE_INFERIOR_HOOK
423 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
426 /* Reinsert all breakpoints. (Those which were symbolic have
427 been reset to the proper address in the new a.out, thanks
428 to symbol_file_command...) */
429 insert_breakpoints ();
431 /* The next resume of this inferior should bring it to the shlib
432 startup breakpoints. (If the user had also set bp's on
433 "main" from the old (parent) process, then they'll auto-
434 matically get reset there in the new process.) */
437 /* Non-zero if we just simulating a single-step. This is needed
438 because we cannot remove the breakpoints in the inferior process
439 until after the `wait' in `wait_for_inferior'. */
440 static int singlestep_breakpoints_inserted_p = 0;
442 /* The thread we inserted single-step breakpoints for. */
443 static ptid_t singlestep_ptid;
445 /* If another thread hit the singlestep breakpoint, we save the original
446 thread here so that we can resume single-stepping it later. */
447 static ptid_t saved_singlestep_ptid;
448 static int stepping_past_singlestep_breakpoint;
451 /* Things to clean up if we QUIT out of resume (). */
453 resume_cleanups (void *ignore)
458 static const char schedlock_off[] = "off";
459 static const char schedlock_on[] = "on";
460 static const char schedlock_step[] = "step";
461 static const char *scheduler_mode = schedlock_off;
462 static const char *scheduler_enums[] = {
470 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
472 if (!target_can_lock_scheduler)
474 scheduler_mode = schedlock_off;
475 error (_("Target '%s' cannot support this command."), target_shortname);
480 /* Resume the inferior, but allow a QUIT. This is useful if the user
481 wants to interrupt some lengthy single-stepping operation
482 (for child processes, the SIGINT goes to the inferior, and so
483 we get a SIGINT random_signal, but for remote debugging and perhaps
484 other targets, that's not true).
486 STEP nonzero if we should step (zero to continue instead).
487 SIG is the signal to give the inferior (zero for none). */
489 resume (int step, enum target_signal sig)
491 int should_resume = 1;
492 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
496 fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n",
499 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
502 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
503 over an instruction that causes a page fault without triggering
504 a hardware watchpoint. The kernel properly notices that it shouldn't
505 stop, because the hardware watchpoint is not triggered, but it forgets
506 the step request and continues the program normally.
507 Work around the problem by removing hardware watchpoints if a step is
508 requested, GDB will check for a hardware watchpoint trigger after the
510 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
511 remove_hw_watchpoints ();
514 /* Normally, by the time we reach `resume', the breakpoints are either
515 removed or inserted, as appropriate. The exception is if we're sitting
516 at a permanent breakpoint; we need to step over it, but permanent
517 breakpoints can't be removed. So we have to test for it here. */
518 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
519 SKIP_PERMANENT_BREAKPOINT ();
521 if (SOFTWARE_SINGLE_STEP_P () && step)
523 /* Do it the hard way, w/temp breakpoints */
524 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
525 /* ...and don't ask hardware to do it. */
527 /* and do not pull these breakpoints until after a `wait' in
528 `wait_for_inferior' */
529 singlestep_breakpoints_inserted_p = 1;
530 singlestep_ptid = inferior_ptid;
533 /* If there were any forks/vforks/execs that were caught and are
534 now to be followed, then do so. */
535 switch (pending_follow.kind)
537 case TARGET_WAITKIND_FORKED:
538 case TARGET_WAITKIND_VFORKED:
539 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
544 case TARGET_WAITKIND_EXECD:
545 /* follow_exec is called as soon as the exec event is seen. */
546 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
553 /* Install inferior's terminal modes. */
554 target_terminal_inferior ();
560 resume_ptid = RESUME_ALL; /* Default */
562 if ((step || singlestep_breakpoints_inserted_p)
563 && (stepping_past_singlestep_breakpoint
564 || (!breakpoints_inserted && breakpoint_here_p (read_pc ()))))
566 /* Stepping past a breakpoint without inserting breakpoints.
567 Make sure only the current thread gets to step, so that
568 other threads don't sneak past breakpoints while they are
571 resume_ptid = inferior_ptid;
574 if ((scheduler_mode == schedlock_on)
575 || (scheduler_mode == schedlock_step
576 && (step || singlestep_breakpoints_inserted_p)))
578 /* User-settable 'scheduler' mode requires solo thread resume. */
579 resume_ptid = inferior_ptid;
582 if (CANNOT_STEP_BREAKPOINT)
584 /* Most targets can step a breakpoint instruction, thus
585 executing it normally. But if this one cannot, just
586 continue and we will hit it anyway. */
587 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
590 target_resume (resume_ptid, step, sig);
593 discard_cleanups (old_cleanups);
597 /* Clear out all variables saying what to do when inferior is continued.
598 First do this, then set the ones you want, then call `proceed'. */
601 clear_proceed_status (void)
604 step_range_start = 0;
606 step_frame_id = null_frame_id;
607 step_over_calls = STEP_OVER_UNDEBUGGABLE;
609 stop_soon = NO_STOP_QUIETLY;
610 proceed_to_finish = 0;
611 breakpoint_proceeded = 1; /* We're about to proceed... */
613 /* Discard any remaining commands or status from previous stop. */
614 bpstat_clear (&stop_bpstat);
617 /* This should be suitable for any targets that support threads. */
620 prepare_to_proceed (void)
623 struct target_waitstatus wait_status;
625 /* Get the last target status returned by target_wait(). */
626 get_last_target_status (&wait_ptid, &wait_status);
628 /* Make sure we were stopped either at a breakpoint, or because
630 if (wait_status.kind != TARGET_WAITKIND_STOPPED
631 || (wait_status.value.sig != TARGET_SIGNAL_TRAP
632 && wait_status.value.sig != TARGET_SIGNAL_INT))
637 if (!ptid_equal (wait_ptid, minus_one_ptid)
638 && !ptid_equal (inferior_ptid, wait_ptid))
640 /* Switched over from WAIT_PID. */
641 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
643 if (wait_pc != read_pc ())
645 /* Switch back to WAIT_PID thread. */
646 inferior_ptid = wait_ptid;
648 /* FIXME: This stuff came from switch_to_thread() in
649 thread.c (which should probably be a public function). */
650 flush_cached_frames ();
651 registers_changed ();
653 select_frame (get_current_frame ());
656 /* We return 1 to indicate that there is a breakpoint here,
657 so we need to step over it before continuing to avoid
658 hitting it straight away. */
659 if (breakpoint_here_p (wait_pc))
667 /* Record the pc of the program the last time it stopped. This is
668 just used internally by wait_for_inferior, but need to be preserved
669 over calls to it and cleared when the inferior is started. */
670 static CORE_ADDR prev_pc;
672 /* Basic routine for continuing the program in various fashions.
674 ADDR is the address to resume at, or -1 for resume where stopped.
675 SIGGNAL is the signal to give it, or 0 for none,
676 or -1 for act according to how it stopped.
677 STEP is nonzero if should trap after one instruction.
678 -1 means return after that and print nothing.
679 You should probably set various step_... variables
680 before calling here, if you are stepping.
682 You should call clear_proceed_status before calling proceed. */
685 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
690 step_start_function = find_pc_function (read_pc ());
694 if (addr == (CORE_ADDR) -1)
696 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
697 /* There is a breakpoint at the address we will resume at,
698 step one instruction before inserting breakpoints so that
699 we do not stop right away (and report a second hit at this
702 else if (gdbarch_single_step_through_delay_p (current_gdbarch)
703 && gdbarch_single_step_through_delay (current_gdbarch,
704 get_current_frame ()))
705 /* We stepped onto an instruction that needs to be stepped
706 again before re-inserting the breakpoint, do so. */
715 fprintf_unfiltered (gdb_stdlog,
716 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
717 paddr_nz (addr), siggnal, step);
719 /* In a multi-threaded task we may select another thread
720 and then continue or step.
722 But if the old thread was stopped at a breakpoint, it
723 will immediately cause another breakpoint stop without
724 any execution (i.e. it will report a breakpoint hit
725 incorrectly). So we must step over it first.
727 prepare_to_proceed checks the current thread against the thread
728 that reported the most recent event. If a step-over is required
729 it returns TRUE and sets the current thread to the old thread. */
730 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
734 /* We will get a trace trap after one instruction.
735 Continue it automatically and insert breakpoints then. */
739 insert_breakpoints ();
740 /* If we get here there was no call to error() in
741 insert breakpoints -- so they were inserted. */
742 breakpoints_inserted = 1;
745 if (siggnal != TARGET_SIGNAL_DEFAULT)
746 stop_signal = siggnal;
747 /* If this signal should not be seen by program,
748 give it zero. Used for debugging signals. */
749 else if (!signal_program[stop_signal])
750 stop_signal = TARGET_SIGNAL_0;
752 annotate_starting ();
754 /* Make sure that output from GDB appears before output from the
756 gdb_flush (gdb_stdout);
758 /* Refresh prev_pc value just prior to resuming. This used to be
759 done in stop_stepping, however, setting prev_pc there did not handle
760 scenarios such as inferior function calls or returning from
761 a function via the return command. In those cases, the prev_pc
762 value was not set properly for subsequent commands. The prev_pc value
763 is used to initialize the starting line number in the ecs. With an
764 invalid value, the gdb next command ends up stopping at the position
765 represented by the next line table entry past our start position.
766 On platforms that generate one line table entry per line, this
767 is not a problem. However, on the ia64, the compiler generates
768 extraneous line table entries that do not increase the line number.
769 When we issue the gdb next command on the ia64 after an inferior call
770 or a return command, we often end up a few instructions forward, still
771 within the original line we started.
773 An attempt was made to have init_execution_control_state () refresh
774 the prev_pc value before calculating the line number. This approach
775 did not work because on platforms that use ptrace, the pc register
776 cannot be read unless the inferior is stopped. At that point, we
777 are not guaranteed the inferior is stopped and so the read_pc ()
778 call can fail. Setting the prev_pc value here ensures the value is
779 updated correctly when the inferior is stopped. */
780 prev_pc = read_pc ();
782 /* Resume inferior. */
783 resume (oneproc || step || bpstat_should_step (), stop_signal);
785 /* Wait for it to stop (if not standalone)
786 and in any case decode why it stopped, and act accordingly. */
787 /* Do this only if we are not using the event loop, or if the target
788 does not support asynchronous execution. */
789 if (!target_can_async_p ())
791 wait_for_inferior ();
797 /* Start remote-debugging of a machine over a serial link. */
803 init_wait_for_inferior ();
804 stop_soon = STOP_QUIETLY;
807 /* Always go on waiting for the target, regardless of the mode. */
808 /* FIXME: cagney/1999-09-23: At present it isn't possible to
809 indicate to wait_for_inferior that a target should timeout if
810 nothing is returned (instead of just blocking). Because of this,
811 targets expecting an immediate response need to, internally, set
812 things up so that the target_wait() is forced to eventually
814 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
815 differentiate to its caller what the state of the target is after
816 the initial open has been performed. Here we're assuming that
817 the target has stopped. It should be possible to eventually have
818 target_open() return to the caller an indication that the target
819 is currently running and GDB state should be set to the same as
821 wait_for_inferior ();
825 /* Initialize static vars when a new inferior begins. */
828 init_wait_for_inferior (void)
830 /* These are meaningless until the first time through wait_for_inferior. */
833 breakpoints_inserted = 0;
834 breakpoint_init_inferior (inf_starting);
836 /* Don't confuse first call to proceed(). */
837 stop_signal = TARGET_SIGNAL_0;
839 /* The first resume is not following a fork/vfork/exec. */
840 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
842 clear_proceed_status ();
844 stepping_past_singlestep_breakpoint = 0;
847 /* This enum encodes possible reasons for doing a target_wait, so that
848 wfi can call target_wait in one place. (Ultimately the call will be
849 moved out of the infinite loop entirely.) */
853 infwait_normal_state,
854 infwait_thread_hop_state,
855 infwait_nonstep_watch_state
858 /* Why did the inferior stop? Used to print the appropriate messages
859 to the interface from within handle_inferior_event(). */
860 enum inferior_stop_reason
862 /* We don't know why. */
864 /* Step, next, nexti, stepi finished. */
866 /* Found breakpoint. */
868 /* Inferior terminated by signal. */
870 /* Inferior exited. */
872 /* Inferior received signal, and user asked to be notified. */
876 /* This structure contains what used to be local variables in
877 wait_for_inferior. Probably many of them can return to being
878 locals in handle_inferior_event. */
880 struct execution_control_state
882 struct target_waitstatus ws;
883 struct target_waitstatus *wp;
886 CORE_ADDR stop_func_start;
887 CORE_ADDR stop_func_end;
888 char *stop_func_name;
889 struct symtab_and_line sal;
891 struct symtab *current_symtab;
892 int handling_longjmp; /* FIXME */
894 ptid_t saved_inferior_ptid;
895 int step_after_step_resume_breakpoint;
896 int stepping_through_solib_after_catch;
897 bpstat stepping_through_solib_catchpoints;
898 int new_thread_event;
899 struct target_waitstatus tmpstatus;
900 enum infwait_states infwait_state;
905 void init_execution_control_state (struct execution_control_state *ecs);
907 void handle_inferior_event (struct execution_control_state *ecs);
909 static void step_into_function (struct execution_control_state *ecs);
910 static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame);
911 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
912 struct frame_id sr_id);
913 static void stop_stepping (struct execution_control_state *ecs);
914 static void prepare_to_wait (struct execution_control_state *ecs);
915 static void keep_going (struct execution_control_state *ecs);
916 static void print_stop_reason (enum inferior_stop_reason stop_reason,
919 /* Wait for control to return from inferior to debugger.
920 If inferior gets a signal, we may decide to start it up again
921 instead of returning. That is why there is a loop in this function.
922 When this function actually returns it means the inferior
923 should be left stopped and GDB should read more commands. */
926 wait_for_inferior (void)
928 struct cleanup *old_cleanups;
929 struct execution_control_state ecss;
930 struct execution_control_state *ecs;
933 fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n");
935 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
936 &step_resume_breakpoint);
938 /* wfi still stays in a loop, so it's OK just to take the address of
939 a local to get the ecs pointer. */
942 /* Fill in with reasonable starting values. */
943 init_execution_control_state (ecs);
945 /* We'll update this if & when we switch to a new thread. */
946 previous_inferior_ptid = inferior_ptid;
948 overlay_cache_invalid = 1;
950 /* We have to invalidate the registers BEFORE calling target_wait
951 because they can be loaded from the target while in target_wait.
952 This makes remote debugging a bit more efficient for those
953 targets that provide critical registers as part of their normal
956 registers_changed ();
960 if (deprecated_target_wait_hook)
961 ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
963 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
965 /* Now figure out what to do with the result of the result. */
966 handle_inferior_event (ecs);
968 if (!ecs->wait_some_more)
971 do_cleanups (old_cleanups);
974 /* Asynchronous version of wait_for_inferior. It is called by the
975 event loop whenever a change of state is detected on the file
976 descriptor corresponding to the target. It can be called more than
977 once to complete a single execution command. In such cases we need
978 to keep the state in a global variable ASYNC_ECSS. If it is the
979 last time that this function is called for a single execution
980 command, then report to the user that the inferior has stopped, and
981 do the necessary cleanups. */
983 struct execution_control_state async_ecss;
984 struct execution_control_state *async_ecs;
987 fetch_inferior_event (void *client_data)
989 static struct cleanup *old_cleanups;
991 async_ecs = &async_ecss;
993 if (!async_ecs->wait_some_more)
995 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
996 &step_resume_breakpoint);
998 /* Fill in with reasonable starting values. */
999 init_execution_control_state (async_ecs);
1001 /* We'll update this if & when we switch to a new thread. */
1002 previous_inferior_ptid = inferior_ptid;
1004 overlay_cache_invalid = 1;
1006 /* We have to invalidate the registers BEFORE calling target_wait
1007 because they can be loaded from the target while in target_wait.
1008 This makes remote debugging a bit more efficient for those
1009 targets that provide critical registers as part of their normal
1010 status mechanism. */
1012 registers_changed ();
1015 if (deprecated_target_wait_hook)
1017 deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1019 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1021 /* Now figure out what to do with the result of the result. */
1022 handle_inferior_event (async_ecs);
1024 if (!async_ecs->wait_some_more)
1026 /* Do only the cleanups that have been added by this
1027 function. Let the continuations for the commands do the rest,
1028 if there are any. */
1029 do_exec_cleanups (old_cleanups);
1031 if (step_multi && stop_step)
1032 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1034 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1038 /* Prepare an execution control state for looping through a
1039 wait_for_inferior-type loop. */
1042 init_execution_control_state (struct execution_control_state *ecs)
1044 /* ecs->another_trap? */
1045 ecs->random_signal = 0;
1046 ecs->step_after_step_resume_breakpoint = 0;
1047 ecs->handling_longjmp = 0; /* FIXME */
1048 ecs->stepping_through_solib_after_catch = 0;
1049 ecs->stepping_through_solib_catchpoints = NULL;
1050 ecs->sal = find_pc_line (prev_pc, 0);
1051 ecs->current_line = ecs->sal.line;
1052 ecs->current_symtab = ecs->sal.symtab;
1053 ecs->infwait_state = infwait_normal_state;
1054 ecs->waiton_ptid = pid_to_ptid (-1);
1055 ecs->wp = &(ecs->ws);
1058 /* Return the cached copy of the last pid/waitstatus returned by
1059 target_wait()/deprecated_target_wait_hook(). The data is actually
1060 cached by handle_inferior_event(), which gets called immediately
1061 after target_wait()/deprecated_target_wait_hook(). */
1064 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1066 *ptidp = target_last_wait_ptid;
1067 *status = target_last_waitstatus;
1070 /* Switch thread contexts, maintaining "infrun state". */
1073 context_switch (struct execution_control_state *ecs)
1075 /* Caution: it may happen that the new thread (or the old one!)
1076 is not in the thread list. In this case we must not attempt
1077 to "switch context", or we run the risk that our context may
1078 be lost. This may happen as a result of the target module
1079 mishandling thread creation. */
1081 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1082 { /* Perform infrun state context switch: */
1083 /* Save infrun state for the old thread. */
1084 save_infrun_state (inferior_ptid, prev_pc,
1085 trap_expected, step_resume_breakpoint,
1087 step_range_end, &step_frame_id,
1088 ecs->handling_longjmp, ecs->another_trap,
1089 ecs->stepping_through_solib_after_catch,
1090 ecs->stepping_through_solib_catchpoints,
1091 ecs->current_line, ecs->current_symtab);
1093 /* Load infrun state for the new thread. */
1094 load_infrun_state (ecs->ptid, &prev_pc,
1095 &trap_expected, &step_resume_breakpoint,
1097 &step_range_end, &step_frame_id,
1098 &ecs->handling_longjmp, &ecs->another_trap,
1099 &ecs->stepping_through_solib_after_catch,
1100 &ecs->stepping_through_solib_catchpoints,
1101 &ecs->current_line, &ecs->current_symtab);
1103 inferior_ptid = ecs->ptid;
1107 adjust_pc_after_break (struct execution_control_state *ecs)
1109 CORE_ADDR breakpoint_pc;
1111 /* If this target does not decrement the PC after breakpoints, then
1112 we have nothing to do. */
1113 if (DECR_PC_AFTER_BREAK == 0)
1116 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1117 we aren't, just return.
1119 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1120 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1121 by software breakpoints should be handled through the normal breakpoint
1124 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1125 different signals (SIGILL or SIGEMT for instance), but it is less
1126 clear where the PC is pointing afterwards. It may not match
1127 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1128 these signals at breakpoints (the code has been in GDB since at least
1129 1992) so I can not guess how to handle them here.
1131 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1132 would have the PC after hitting a watchpoint affected by
1133 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1134 in GDB history, and it seems unlikely to be correct, so
1135 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1137 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1140 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1143 /* Find the location where (if we've hit a breakpoint) the
1144 breakpoint would be. */
1145 breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK;
1147 if (SOFTWARE_SINGLE_STEP_P ())
1149 /* When using software single-step, a SIGTRAP can only indicate
1150 an inserted breakpoint. This actually makes things
1152 if (singlestep_breakpoints_inserted_p)
1153 /* When software single stepping, the instruction at [prev_pc]
1154 is never a breakpoint, but the instruction following
1155 [prev_pc] (in program execution order) always is. Assume
1156 that following instruction was reached and hence a software
1157 breakpoint was hit. */
1158 write_pc_pid (breakpoint_pc, ecs->ptid);
1159 else if (software_breakpoint_inserted_here_p (breakpoint_pc))
1160 /* The inferior was free running (i.e., no single-step
1161 breakpoints inserted) and it hit a software breakpoint. */
1162 write_pc_pid (breakpoint_pc, ecs->ptid);
1166 /* When using hardware single-step, a SIGTRAP is reported for
1167 both a completed single-step and a software breakpoint. Need
1168 to differentiate between the two as the latter needs
1169 adjusting but the former does not. */
1170 if (currently_stepping (ecs))
1172 if (prev_pc == breakpoint_pc
1173 && software_breakpoint_inserted_here_p (breakpoint_pc))
1174 /* Hardware single-stepped a software breakpoint (as
1175 occures when the inferior is resumed with PC pointing
1176 at not-yet-hit software breakpoint). Since the
1177 breakpoint really is executed, the inferior needs to be
1178 backed up to the breakpoint address. */
1179 write_pc_pid (breakpoint_pc, ecs->ptid);
1183 if (software_breakpoint_inserted_here_p (breakpoint_pc))
1184 /* The inferior was free running (i.e., no hardware
1185 single-step and no possibility of a false SIGTRAP) and
1186 hit a software breakpoint. */
1187 write_pc_pid (breakpoint_pc, ecs->ptid);
1192 /* Given an execution control state that has been freshly filled in
1193 by an event from the inferior, figure out what it means and take
1194 appropriate action. */
1196 int stepped_after_stopped_by_watchpoint;
1199 handle_inferior_event (struct execution_control_state *ecs)
1201 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1202 thinking that the variable stepped_after_stopped_by_watchpoint
1203 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1204 defined in the file "config/pa/nm-hppah.h", accesses the variable
1205 indirectly. Mutter something rude about the HP merge. */
1206 int sw_single_step_trap_p = 0;
1207 int stopped_by_watchpoint = -1; /* Mark as unknown. */
1209 /* Cache the last pid/waitstatus. */
1210 target_last_wait_ptid = ecs->ptid;
1211 target_last_waitstatus = *ecs->wp;
1213 adjust_pc_after_break (ecs);
1215 switch (ecs->infwait_state)
1217 case infwait_thread_hop_state:
1219 fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n");
1220 /* Cancel the waiton_ptid. */
1221 ecs->waiton_ptid = pid_to_ptid (-1);
1224 case infwait_normal_state:
1226 fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n");
1227 stepped_after_stopped_by_watchpoint = 0;
1230 case infwait_nonstep_watch_state:
1232 fprintf_unfiltered (gdb_stdlog,
1233 "infrun: infwait_nonstep_watch_state\n");
1234 insert_breakpoints ();
1236 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1237 handle things like signals arriving and other things happening
1238 in combination correctly? */
1239 stepped_after_stopped_by_watchpoint = 1;
1243 internal_error (__FILE__, __LINE__, _("bad switch"));
1245 ecs->infwait_state = infwait_normal_state;
1247 flush_cached_frames ();
1249 /* If it's a new process, add it to the thread database */
1251 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1252 && !ptid_equal (ecs->ptid, minus_one_ptid)
1253 && !in_thread_list (ecs->ptid));
1255 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1256 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1258 add_thread (ecs->ptid);
1260 ui_out_text (uiout, "[New ");
1261 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1262 ui_out_text (uiout, "]\n");
1265 switch (ecs->ws.kind)
1267 case TARGET_WAITKIND_LOADED:
1269 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n");
1270 /* Ignore gracefully during startup of the inferior, as it
1271 might be the shell which has just loaded some objects,
1272 otherwise add the symbols for the newly loaded objects. */
1274 if (stop_soon == NO_STOP_QUIETLY)
1276 /* Remove breakpoints, SOLIB_ADD might adjust
1277 breakpoint addresses via breakpoint_re_set. */
1278 if (breakpoints_inserted)
1279 remove_breakpoints ();
1281 /* Check for any newly added shared libraries if we're
1282 supposed to be adding them automatically. Switch
1283 terminal for any messages produced by
1284 breakpoint_re_set. */
1285 target_terminal_ours_for_output ();
1286 /* NOTE: cagney/2003-11-25: Make certain that the target
1287 stack's section table is kept up-to-date. Architectures,
1288 (e.g., PPC64), use the section table to perform
1289 operations such as address => section name and hence
1290 require the table to contain all sections (including
1291 those found in shared libraries). */
1292 /* NOTE: cagney/2003-11-25: Pass current_target and not
1293 exec_ops to SOLIB_ADD. This is because current GDB is
1294 only tooled to propagate section_table changes out from
1295 the "current_target" (see target_resize_to_sections), and
1296 not up from the exec stratum. This, of course, isn't
1297 right. "infrun.c" should only interact with the
1298 exec/process stratum, instead relying on the target stack
1299 to propagate relevant changes (stop, section table
1300 changed, ...) up to other layers. */
1301 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1302 target_terminal_inferior ();
1304 /* Reinsert breakpoints and continue. */
1305 if (breakpoints_inserted)
1306 insert_breakpoints ();
1309 resume (0, TARGET_SIGNAL_0);
1310 prepare_to_wait (ecs);
1313 case TARGET_WAITKIND_SPURIOUS:
1315 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1316 resume (0, TARGET_SIGNAL_0);
1317 prepare_to_wait (ecs);
1320 case TARGET_WAITKIND_EXITED:
1322 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n");
1323 target_terminal_ours (); /* Must do this before mourn anyway */
1324 print_stop_reason (EXITED, ecs->ws.value.integer);
1326 /* Record the exit code in the convenience variable $_exitcode, so
1327 that the user can inspect this again later. */
1328 set_internalvar (lookup_internalvar ("_exitcode"),
1329 value_from_longest (builtin_type_int,
1330 (LONGEST) ecs->ws.value.integer));
1331 gdb_flush (gdb_stdout);
1332 target_mourn_inferior ();
1333 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1334 stop_print_frame = 0;
1335 stop_stepping (ecs);
1338 case TARGET_WAITKIND_SIGNALLED:
1340 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1341 stop_print_frame = 0;
1342 stop_signal = ecs->ws.value.sig;
1343 target_terminal_ours (); /* Must do this before mourn anyway */
1345 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1346 reach here unless the inferior is dead. However, for years
1347 target_kill() was called here, which hints that fatal signals aren't
1348 really fatal on some systems. If that's true, then some changes
1350 target_mourn_inferior ();
1352 print_stop_reason (SIGNAL_EXITED, stop_signal);
1353 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1354 stop_stepping (ecs);
1357 /* The following are the only cases in which we keep going;
1358 the above cases end in a continue or goto. */
1359 case TARGET_WAITKIND_FORKED:
1360 case TARGET_WAITKIND_VFORKED:
1362 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n");
1363 stop_signal = TARGET_SIGNAL_TRAP;
1364 pending_follow.kind = ecs->ws.kind;
1366 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1367 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1369 stop_pc = read_pc ();
1371 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1373 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1375 /* If no catchpoint triggered for this, then keep going. */
1376 if (ecs->random_signal)
1378 stop_signal = TARGET_SIGNAL_0;
1382 goto process_event_stop_test;
1384 case TARGET_WAITKIND_EXECD:
1386 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECED\n");
1387 stop_signal = TARGET_SIGNAL_TRAP;
1389 /* NOTE drow/2002-12-05: This code should be pushed down into the
1390 target_wait function. Until then following vfork on HP/UX 10.20
1391 is probably broken by this. Of course, it's broken anyway. */
1392 /* Is this a target which reports multiple exec events per actual
1393 call to exec()? (HP-UX using ptrace does, for example.) If so,
1394 ignore all but the last one. Just resume the exec'r, and wait
1395 for the next exec event. */
1396 if (inferior_ignoring_leading_exec_events)
1398 inferior_ignoring_leading_exec_events--;
1399 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1400 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1402 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1403 prepare_to_wait (ecs);
1406 inferior_ignoring_leading_exec_events =
1407 target_reported_exec_events_per_exec_call () - 1;
1409 pending_follow.execd_pathname =
1410 savestring (ecs->ws.value.execd_pathname,
1411 strlen (ecs->ws.value.execd_pathname));
1413 /* This causes the eventpoints and symbol table to be reset. Must
1414 do this now, before trying to determine whether to stop. */
1415 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1416 xfree (pending_follow.execd_pathname);
1418 stop_pc = read_pc_pid (ecs->ptid);
1419 ecs->saved_inferior_ptid = inferior_ptid;
1420 inferior_ptid = ecs->ptid;
1422 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1424 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1425 inferior_ptid = ecs->saved_inferior_ptid;
1427 /* If no catchpoint triggered for this, then keep going. */
1428 if (ecs->random_signal)
1430 stop_signal = TARGET_SIGNAL_0;
1434 goto process_event_stop_test;
1436 /* Be careful not to try to gather much state about a thread
1437 that's in a syscall. It's frequently a losing proposition. */
1438 case TARGET_WAITKIND_SYSCALL_ENTRY:
1440 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1441 resume (0, TARGET_SIGNAL_0);
1442 prepare_to_wait (ecs);
1445 /* Before examining the threads further, step this thread to
1446 get it entirely out of the syscall. (We get notice of the
1447 event when the thread is just on the verge of exiting a
1448 syscall. Stepping one instruction seems to get it back
1450 case TARGET_WAITKIND_SYSCALL_RETURN:
1452 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1453 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1454 prepare_to_wait (ecs);
1457 case TARGET_WAITKIND_STOPPED:
1459 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n");
1460 stop_signal = ecs->ws.value.sig;
1463 /* We had an event in the inferior, but we are not interested
1464 in handling it at this level. The lower layers have already
1465 done what needs to be done, if anything.
1467 One of the possible circumstances for this is when the
1468 inferior produces output for the console. The inferior has
1469 not stopped, and we are ignoring the event. Another possible
1470 circumstance is any event which the lower level knows will be
1471 reported multiple times without an intervening resume. */
1472 case TARGET_WAITKIND_IGNORE:
1474 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n");
1475 prepare_to_wait (ecs);
1479 /* We may want to consider not doing a resume here in order to give
1480 the user a chance to play with the new thread. It might be good
1481 to make that a user-settable option. */
1483 /* At this point, all threads are stopped (happens automatically in
1484 either the OS or the native code). Therefore we need to continue
1485 all threads in order to make progress. */
1486 if (ecs->new_thread_event)
1488 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1489 prepare_to_wait (ecs);
1493 stop_pc = read_pc_pid (ecs->ptid);
1496 fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc));
1498 if (stepping_past_singlestep_breakpoint)
1500 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1501 && singlestep_breakpoints_inserted_p);
1502 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1503 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1505 stepping_past_singlestep_breakpoint = 0;
1507 /* We've either finished single-stepping past the single-step
1508 breakpoint, or stopped for some other reason. It would be nice if
1509 we could tell, but we can't reliably. */
1510 if (stop_signal == TARGET_SIGNAL_TRAP)
1513 fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n");
1514 /* Pull the single step breakpoints out of the target. */
1515 SOFTWARE_SINGLE_STEP (0, 0);
1516 singlestep_breakpoints_inserted_p = 0;
1518 ecs->random_signal = 0;
1520 ecs->ptid = saved_singlestep_ptid;
1521 context_switch (ecs);
1522 if (deprecated_context_hook)
1523 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1525 resume (1, TARGET_SIGNAL_0);
1526 prepare_to_wait (ecs);
1531 stepping_past_singlestep_breakpoint = 0;
1533 /* See if a thread hit a thread-specific breakpoint that was meant for
1534 another thread. If so, then step that thread past the breakpoint,
1537 if (stop_signal == TARGET_SIGNAL_TRAP)
1539 int thread_hop_needed = 0;
1541 /* Check if a regular breakpoint has been hit before checking
1542 for a potential single step breakpoint. Otherwise, GDB will
1543 not see this breakpoint hit when stepping onto breakpoints. */
1544 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1546 ecs->random_signal = 0;
1547 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1548 thread_hop_needed = 1;
1550 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1552 ecs->random_signal = 0;
1553 /* The call to in_thread_list is necessary because PTIDs sometimes
1554 change when we go from single-threaded to multi-threaded. If
1555 the singlestep_ptid is still in the list, assume that it is
1556 really different from ecs->ptid. */
1557 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1558 && in_thread_list (singlestep_ptid))
1560 thread_hop_needed = 1;
1561 stepping_past_singlestep_breakpoint = 1;
1562 saved_singlestep_ptid = singlestep_ptid;
1566 if (thread_hop_needed)
1571 fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n");
1573 /* Saw a breakpoint, but it was hit by the wrong thread.
1576 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1578 /* Pull the single step breakpoints out of the target. */
1579 SOFTWARE_SINGLE_STEP (0, 0);
1580 singlestep_breakpoints_inserted_p = 0;
1583 remove_status = remove_breakpoints ();
1584 /* Did we fail to remove breakpoints? If so, try
1585 to set the PC past the bp. (There's at least
1586 one situation in which we can fail to remove
1587 the bp's: On HP-UX's that use ttrace, we can't
1588 change the address space of a vforking child
1589 process until the child exits (well, okay, not
1590 then either :-) or execs. */
1591 if (remove_status != 0)
1593 /* FIXME! This is obviously non-portable! */
1594 write_pc_pid (stop_pc + 4, ecs->ptid);
1595 /* We need to restart all the threads now,
1596 * unles we're running in scheduler-locked mode.
1597 * Use currently_stepping to determine whether to
1600 /* FIXME MVS: is there any reason not to call resume()? */
1601 if (scheduler_mode == schedlock_on)
1602 target_resume (ecs->ptid,
1603 currently_stepping (ecs), TARGET_SIGNAL_0);
1605 target_resume (RESUME_ALL,
1606 currently_stepping (ecs), TARGET_SIGNAL_0);
1607 prepare_to_wait (ecs);
1612 breakpoints_inserted = 0;
1613 if (!ptid_equal (inferior_ptid, ecs->ptid))
1614 context_switch (ecs);
1615 ecs->waiton_ptid = ecs->ptid;
1616 ecs->wp = &(ecs->ws);
1617 ecs->another_trap = 1;
1619 ecs->infwait_state = infwait_thread_hop_state;
1621 registers_changed ();
1625 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1627 sw_single_step_trap_p = 1;
1628 ecs->random_signal = 0;
1632 ecs->random_signal = 1;
1634 /* See if something interesting happened to the non-current thread. If
1635 so, then switch to that thread. */
1636 if (!ptid_equal (ecs->ptid, inferior_ptid))
1639 fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n");
1641 context_switch (ecs);
1643 if (deprecated_context_hook)
1644 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1646 flush_cached_frames ();
1649 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1651 /* Pull the single step breakpoints out of the target. */
1652 SOFTWARE_SINGLE_STEP (0, 0);
1653 singlestep_breakpoints_inserted_p = 0;
1656 /* It may not be necessary to disable the watchpoint to stop over
1657 it. For example, the PA can (with some kernel cooperation)
1658 single step over a watchpoint without disabling the watchpoint. */
1659 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1662 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1664 prepare_to_wait (ecs);
1668 /* It is far more common to need to disable a watchpoint to step
1669 the inferior over it. FIXME. What else might a debug
1670 register or page protection watchpoint scheme need here? */
1671 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1673 /* At this point, we are stopped at an instruction which has
1674 attempted to write to a piece of memory under control of
1675 a watchpoint. The instruction hasn't actually executed
1676 yet. If we were to evaluate the watchpoint expression
1677 now, we would get the old value, and therefore no change
1678 would seem to have occurred.
1680 In order to make watchpoints work `right', we really need
1681 to complete the memory write, and then evaluate the
1682 watchpoint expression. The following code does that by
1683 removing the watchpoint (actually, all watchpoints and
1684 breakpoints), single-stepping the target, re-inserting
1685 watchpoints, and then falling through to let normal
1686 single-step processing handle proceed. Since this
1687 includes evaluating watchpoints, things will come to a
1688 stop in the correct manner. */
1691 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1692 remove_breakpoints ();
1693 registers_changed ();
1694 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1696 ecs->waiton_ptid = ecs->ptid;
1697 ecs->wp = &(ecs->ws);
1698 ecs->infwait_state = infwait_nonstep_watch_state;
1699 prepare_to_wait (ecs);
1703 /* It may be possible to simply continue after a watchpoint. */
1704 if (HAVE_CONTINUABLE_WATCHPOINT)
1705 stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws);
1707 ecs->stop_func_start = 0;
1708 ecs->stop_func_end = 0;
1709 ecs->stop_func_name = 0;
1710 /* Don't care about return value; stop_func_start and stop_func_name
1711 will both be 0 if it doesn't work. */
1712 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1713 &ecs->stop_func_start, &ecs->stop_func_end);
1714 ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET;
1715 ecs->another_trap = 0;
1716 bpstat_clear (&stop_bpstat);
1718 stop_stack_dummy = 0;
1719 stop_print_frame = 1;
1720 ecs->random_signal = 0;
1721 stopped_by_random_signal = 0;
1722 breakpoints_failed = 0;
1724 if (stop_signal == TARGET_SIGNAL_TRAP
1726 && gdbarch_single_step_through_delay_p (current_gdbarch)
1727 && currently_stepping (ecs))
1729 /* We're trying to step of a breakpoint. Turns out that we're
1730 also on an instruction that needs to be stepped multiple
1731 times before it's been fully executing. E.g., architectures
1732 with a delay slot. It needs to be stepped twice, once for
1733 the instruction and once for the delay slot. */
1734 int step_through_delay
1735 = gdbarch_single_step_through_delay (current_gdbarch,
1736 get_current_frame ());
1737 if (debug_infrun && step_through_delay)
1738 fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n");
1739 if (step_range_end == 0 && step_through_delay)
1741 /* The user issued a continue when stopped at a breakpoint.
1742 Set up for another trap and get out of here. */
1743 ecs->another_trap = 1;
1747 else if (step_through_delay)
1749 /* The user issued a step when stopped at a breakpoint.
1750 Maybe we should stop, maybe we should not - the delay
1751 slot *might* correspond to a line of source. In any
1752 case, don't decide that here, just set ecs->another_trap,
1753 making sure we single-step again before breakpoints are
1755 ecs->another_trap = 1;
1759 /* Look at the cause of the stop, and decide what to do.
1760 The alternatives are:
1761 1) break; to really stop and return to the debugger,
1762 2) drop through to start up again
1763 (set ecs->another_trap to 1 to single step once)
1764 3) set ecs->random_signal to 1, and the decision between 1 and 2
1765 will be made according to the signal handling tables. */
1767 /* First, distinguish signals caused by the debugger from signals
1768 that have to do with the program's own actions. Note that
1769 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1770 on the operating system version. Here we detect when a SIGILL or
1771 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1772 something similar for SIGSEGV, since a SIGSEGV will be generated
1773 when we're trying to execute a breakpoint instruction on a
1774 non-executable stack. This happens for call dummy breakpoints
1775 for architectures like SPARC that place call dummies on the
1778 if (stop_signal == TARGET_SIGNAL_TRAP
1779 || (breakpoints_inserted
1780 && (stop_signal == TARGET_SIGNAL_ILL
1781 || stop_signal == TARGET_SIGNAL_SEGV
1782 || stop_signal == TARGET_SIGNAL_EMT))
1783 || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1785 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1788 fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n");
1789 stop_print_frame = 0;
1790 stop_stepping (ecs);
1794 /* This is originated from start_remote(), start_inferior() and
1795 shared libraries hook functions. */
1796 if (stop_soon == STOP_QUIETLY)
1799 fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
1800 stop_stepping (ecs);
1804 /* This originates from attach_command(). We need to overwrite
1805 the stop_signal here, because some kernels don't ignore a
1806 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1807 See more comments in inferior.h. */
1808 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1810 stop_stepping (ecs);
1811 if (stop_signal == TARGET_SIGNAL_STOP)
1812 stop_signal = TARGET_SIGNAL_0;
1816 /* Don't even think about breakpoints if just proceeded over a
1818 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1821 fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n");
1822 bpstat_clear (&stop_bpstat);
1826 /* See if there is a breakpoint at the current PC. */
1827 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid,
1828 stopped_by_watchpoint);
1830 /* Following in case break condition called a
1832 stop_print_frame = 1;
1835 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1836 at one stage in the past included checks for an inferior
1837 function call's call dummy's return breakpoint. The original
1838 comment, that went with the test, read:
1840 ``End of a stack dummy. Some systems (e.g. Sony news) give
1841 another signal besides SIGTRAP, so check here as well as
1844 If someone ever tries to get get call dummys on a
1845 non-executable stack to work (where the target would stop
1846 with something like a SIGSEGV), then those tests might need
1847 to be re-instated. Given, however, that the tests were only
1848 enabled when momentary breakpoints were not being used, I
1849 suspect that it won't be the case.
1851 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1852 be necessary for call dummies on a non-executable stack on
1855 if (stop_signal == TARGET_SIGNAL_TRAP)
1857 = !(bpstat_explains_signal (stop_bpstat)
1859 || (step_range_end && step_resume_breakpoint == NULL));
1862 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1863 if (!ecs->random_signal)
1864 stop_signal = TARGET_SIGNAL_TRAP;
1868 /* When we reach this point, we've pretty much decided
1869 that the reason for stopping must've been a random
1870 (unexpected) signal. */
1873 ecs->random_signal = 1;
1875 process_event_stop_test:
1876 /* For the program's own signals, act according to
1877 the signal handling tables. */
1879 if (ecs->random_signal)
1881 /* Signal not for debugging purposes. */
1885 fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal);
1887 stopped_by_random_signal = 1;
1889 if (signal_print[stop_signal])
1892 target_terminal_ours_for_output ();
1893 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
1895 if (signal_stop[stop_signal])
1897 stop_stepping (ecs);
1900 /* If not going to stop, give terminal back
1901 if we took it away. */
1903 target_terminal_inferior ();
1905 /* Clear the signal if it should not be passed. */
1906 if (signal_program[stop_signal] == 0)
1907 stop_signal = TARGET_SIGNAL_0;
1909 if (prev_pc == read_pc ()
1910 && !breakpoints_inserted
1911 && breakpoint_here_p (read_pc ())
1912 && step_resume_breakpoint == NULL)
1914 /* We were just starting a new sequence, attempting to
1915 single-step off of a breakpoint and expecting a SIGTRAP.
1916 Intead this signal arrives. This signal will take us out
1917 of the stepping range so GDB needs to remember to, when
1918 the signal handler returns, resume stepping off that
1920 /* To simplify things, "continue" is forced to use the same
1921 code paths as single-step - set a breakpoint at the
1922 signal return address and then, once hit, step off that
1924 insert_step_resume_breakpoint_at_frame (get_current_frame ());
1925 ecs->step_after_step_resume_breakpoint = 1;
1930 if (step_range_end != 0
1931 && stop_signal != TARGET_SIGNAL_0
1932 && stop_pc >= step_range_start && stop_pc < step_range_end
1933 && frame_id_eq (get_frame_id (get_current_frame ()),
1935 && step_resume_breakpoint == NULL)
1937 /* The inferior is about to take a signal that will take it
1938 out of the single step range. Set a breakpoint at the
1939 current PC (which is presumably where the signal handler
1940 will eventually return) and then allow the inferior to
1943 Note that this is only needed for a signal delivered
1944 while in the single-step range. Nested signals aren't a
1945 problem as they eventually all return. */
1946 insert_step_resume_breakpoint_at_frame (get_current_frame ());
1951 /* Note: step_resume_breakpoint may be non-NULL. This occures
1952 when either there's a nested signal, or when there's a
1953 pending signal enabled just as the signal handler returns
1954 (leaving the inferior at the step-resume-breakpoint without
1955 actually executing it). Either way continue until the
1956 breakpoint is really hit. */
1961 /* Handle cases caused by hitting a breakpoint. */
1963 CORE_ADDR jmp_buf_pc;
1964 struct bpstat_what what;
1966 what = bpstat_what (stop_bpstat);
1968 if (what.call_dummy)
1970 stop_stack_dummy = 1;
1973 switch (what.main_action)
1975 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
1976 /* If we hit the breakpoint at longjmp, disable it for the
1977 duration of this command. Then, install a temporary
1978 breakpoint at the target of the jmp_buf. */
1980 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_SET_LONGJMP_RESUME\n");
1981 disable_longjmp_breakpoint ();
1982 remove_breakpoints ();
1983 breakpoints_inserted = 0;
1984 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
1990 /* Need to blow away step-resume breakpoint, as it
1991 interferes with us */
1992 if (step_resume_breakpoint != NULL)
1994 delete_step_resume_breakpoint (&step_resume_breakpoint);
1997 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
1998 ecs->handling_longjmp = 1; /* FIXME */
2002 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2003 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2005 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_CLEAR_LONGJMP_RESUME\n");
2006 remove_breakpoints ();
2007 breakpoints_inserted = 0;
2008 disable_longjmp_breakpoint ();
2009 ecs->handling_longjmp = 0; /* FIXME */
2010 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2012 /* else fallthrough */
2014 case BPSTAT_WHAT_SINGLE:
2016 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_SINGLE\n");
2017 if (breakpoints_inserted)
2019 remove_breakpoints ();
2021 breakpoints_inserted = 0;
2022 ecs->another_trap = 1;
2023 /* Still need to check other stuff, at least the case
2024 where we are stepping and step out of the right range. */
2027 case BPSTAT_WHAT_STOP_NOISY:
2029 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STOP_NOISY\n");
2030 stop_print_frame = 1;
2032 /* We are about to nuke the step_resume_breakpointt via the
2033 cleanup chain, so no need to worry about it here. */
2035 stop_stepping (ecs);
2038 case BPSTAT_WHAT_STOP_SILENT:
2040 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STOP_SILENT\n");
2041 stop_print_frame = 0;
2043 /* We are about to nuke the step_resume_breakpoin via the
2044 cleanup chain, so no need to worry about it here. */
2046 stop_stepping (ecs);
2049 case BPSTAT_WHAT_STEP_RESUME:
2050 /* This proably demands a more elegant solution, but, yeah
2053 This function's use of the simple variable
2054 step_resume_breakpoint doesn't seem to accomodate
2055 simultaneously active step-resume bp's, although the
2056 breakpoint list certainly can.
2058 If we reach here and step_resume_breakpoint is already
2059 NULL, then apparently we have multiple active
2060 step-resume bp's. We'll just delete the breakpoint we
2061 stopped at, and carry on.
2063 Correction: what the code currently does is delete a
2064 step-resume bp, but it makes no effort to ensure that
2065 the one deleted is the one currently stopped at. MVS */
2068 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STEP_RESUME\n");
2070 if (step_resume_breakpoint == NULL)
2072 step_resume_breakpoint =
2073 bpstat_find_step_resume_breakpoint (stop_bpstat);
2075 delete_step_resume_breakpoint (&step_resume_breakpoint);
2076 if (ecs->step_after_step_resume_breakpoint)
2078 /* Back when the step-resume breakpoint was inserted, we
2079 were trying to single-step off a breakpoint. Go back
2081 ecs->step_after_step_resume_breakpoint = 0;
2082 remove_breakpoints ();
2083 breakpoints_inserted = 0;
2084 ecs->another_trap = 1;
2090 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2092 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_THROUGH_SIGTRAMP\n");
2093 /* If were waiting for a trap, hitting the step_resume_break
2094 doesn't count as getting it. */
2096 ecs->another_trap = 1;
2099 case BPSTAT_WHAT_CHECK_SHLIBS:
2100 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2104 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_CHECK_SHLIBS\n");
2105 /* Remove breakpoints, we eventually want to step over the
2106 shlib event breakpoint, and SOLIB_ADD might adjust
2107 breakpoint addresses via breakpoint_re_set. */
2108 if (breakpoints_inserted)
2109 remove_breakpoints ();
2110 breakpoints_inserted = 0;
2112 /* Check for any newly added shared libraries if we're
2113 supposed to be adding them automatically. Switch
2114 terminal for any messages produced by
2115 breakpoint_re_set. */
2116 target_terminal_ours_for_output ();
2117 /* NOTE: cagney/2003-11-25: Make certain that the target
2118 stack's section table is kept up-to-date. Architectures,
2119 (e.g., PPC64), use the section table to perform
2120 operations such as address => section name and hence
2121 require the table to contain all sections (including
2122 those found in shared libraries). */
2123 /* NOTE: cagney/2003-11-25: Pass current_target and not
2124 exec_ops to SOLIB_ADD. This is because current GDB is
2125 only tooled to propagate section_table changes out from
2126 the "current_target" (see target_resize_to_sections), and
2127 not up from the exec stratum. This, of course, isn't
2128 right. "infrun.c" should only interact with the
2129 exec/process stratum, instead relying on the target stack
2130 to propagate relevant changes (stop, section table
2131 changed, ...) up to other layers. */
2132 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2133 target_terminal_inferior ();
2135 /* Try to reenable shared library breakpoints, additional
2136 code segments in shared libraries might be mapped in now. */
2137 re_enable_breakpoints_in_shlibs ();
2139 /* If requested, stop when the dynamic linker notifies
2140 gdb of events. This allows the user to get control
2141 and place breakpoints in initializer routines for
2142 dynamically loaded objects (among other things). */
2143 if (stop_on_solib_events || stop_stack_dummy)
2145 stop_stepping (ecs);
2149 /* If we stopped due to an explicit catchpoint, then the
2150 (see above) call to SOLIB_ADD pulled in any symbols
2151 from a newly-loaded library, if appropriate.
2153 We do want the inferior to stop, but not where it is
2154 now, which is in the dynamic linker callback. Rather,
2155 we would like it stop in the user's program, just after
2156 the call that caused this catchpoint to trigger. That
2157 gives the user a more useful vantage from which to
2158 examine their program's state. */
2159 else if (what.main_action
2160 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2162 /* ??rehrauer: If I could figure out how to get the
2163 right return PC from here, we could just set a temp
2164 breakpoint and resume. I'm not sure we can without
2165 cracking open the dld's shared libraries and sniffing
2166 their unwind tables and text/data ranges, and that's
2167 not a terribly portable notion.
2169 Until that time, we must step the inferior out of the
2170 dld callback, and also out of the dld itself (and any
2171 code or stubs in libdld.sl, such as "shl_load" and
2172 friends) until we reach non-dld code. At that point,
2173 we can stop stepping. */
2174 bpstat_get_triggered_catchpoints (stop_bpstat,
2176 stepping_through_solib_catchpoints);
2177 ecs->stepping_through_solib_after_catch = 1;
2179 /* Be sure to lift all breakpoints, so the inferior does
2180 actually step past this point... */
2181 ecs->another_trap = 1;
2186 /* We want to step over this breakpoint, then keep going. */
2187 ecs->another_trap = 1;
2194 case BPSTAT_WHAT_LAST:
2195 /* Not a real code, but listed here to shut up gcc -Wall. */
2197 case BPSTAT_WHAT_KEEP_CHECKING:
2202 /* We come here if we hit a breakpoint but should not
2203 stop for it. Possibly we also were stepping
2204 and should stop for that. So fall through and
2205 test for stepping. But, if not stepping,
2208 /* Are we stepping to get the inferior out of the dynamic linker's
2209 hook (and possibly the dld itself) after catching a shlib
2211 if (ecs->stepping_through_solib_after_catch)
2213 #if defined(SOLIB_ADD)
2214 /* Have we reached our destination? If not, keep going. */
2215 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2218 fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n");
2219 ecs->another_trap = 1;
2225 fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n");
2226 /* Else, stop and report the catchpoint(s) whose triggering
2227 caused us to begin stepping. */
2228 ecs->stepping_through_solib_after_catch = 0;
2229 bpstat_clear (&stop_bpstat);
2230 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2231 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2232 stop_print_frame = 1;
2233 stop_stepping (ecs);
2237 if (step_resume_breakpoint)
2240 fprintf_unfiltered (gdb_stdlog, "infrun: step-resume breakpoint\n");
2242 /* Having a step-resume breakpoint overrides anything
2243 else having to do with stepping commands until
2244 that breakpoint is reached. */
2249 if (step_range_end == 0)
2252 fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n");
2253 /* Likewise if we aren't even stepping. */
2258 /* If stepping through a line, keep going if still within it.
2260 Note that step_range_end is the address of the first instruction
2261 beyond the step range, and NOT the address of the last instruction
2263 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2266 fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n",
2267 paddr_nz (step_range_start),
2268 paddr_nz (step_range_end));
2273 /* We stepped out of the stepping range. */
2275 /* If we are stepping at the source level and entered the runtime
2276 loader dynamic symbol resolution code, we keep on single stepping
2277 until we exit the run time loader code and reach the callee's
2279 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2280 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2282 CORE_ADDR pc_after_resolver =
2283 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2286 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n");
2288 if (pc_after_resolver)
2290 /* Set up a step-resume breakpoint at the address
2291 indicated by SKIP_SOLIB_RESOLVER. */
2292 struct symtab_and_line sr_sal;
2294 sr_sal.pc = pc_after_resolver;
2296 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2303 if (step_range_end != 1
2304 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2305 || step_over_calls == STEP_OVER_ALL)
2306 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2309 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n");
2310 /* The inferior, while doing a "step" or "next", has ended up in
2311 a signal trampoline (either by a signal being delivered or by
2312 the signal handler returning). Just single-step until the
2313 inferior leaves the trampoline (either by calling the handler
2319 if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id))
2321 /* It's a subroutine call. */
2322 CORE_ADDR real_stop_pc;
2325 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n");
2327 if ((step_over_calls == STEP_OVER_NONE)
2328 || ((step_range_end == 1)
2329 && in_prologue (prev_pc, ecs->stop_func_start)))
2331 /* I presume that step_over_calls is only 0 when we're
2332 supposed to be stepping at the assembly language level
2333 ("stepi"). Just stop. */
2334 /* Also, maybe we just did a "nexti" inside a prolog, so we
2335 thought it was a subroutine call but it was not. Stop as
2338 print_stop_reason (END_STEPPING_RANGE, 0);
2339 stop_stepping (ecs);
2343 if (step_over_calls == STEP_OVER_ALL)
2345 /* We're doing a "next", set a breakpoint at callee's return
2346 address (the address at which the caller will
2348 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2353 /* If we are in a function call trampoline (a stub between the
2354 calling routine and the real function), locate the real
2355 function. That's what tells us (a) whether we want to step
2356 into it at all, and (b) what prologue we want to run to the
2357 end of, if we do step into it. */
2358 real_stop_pc = skip_language_trampoline (stop_pc);
2359 if (real_stop_pc == 0)
2360 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2361 if (real_stop_pc != 0)
2362 ecs->stop_func_start = real_stop_pc;
2364 if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start))
2366 struct symtab_and_line sr_sal;
2368 sr_sal.pc = ecs->stop_func_start;
2370 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2375 /* If we have line number information for the function we are
2376 thinking of stepping into, step into it.
2378 If there are several symtabs at that PC (e.g. with include
2379 files), just want to know whether *any* of them have line
2380 numbers. find_pc_line handles this. */
2382 struct symtab_and_line tmp_sal;
2384 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2385 if (tmp_sal.line != 0)
2387 step_into_function (ecs);
2392 /* If we have no line number and the step-stop-if-no-debug is
2393 set, we stop the step so that the user has a chance to switch
2394 in assembly mode. */
2395 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2398 print_stop_reason (END_STEPPING_RANGE, 0);
2399 stop_stepping (ecs);
2403 /* Set a breakpoint at callee's return address (the address at
2404 which the caller will resume). */
2405 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2410 /* If we're in the return path from a shared library trampoline,
2411 we want to proceed through the trampoline when stepping. */
2412 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2414 /* Determine where this trampoline returns. */
2415 CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2418 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n");
2420 /* Only proceed through if we know where it's going. */
2423 /* And put the step-breakpoint there and go until there. */
2424 struct symtab_and_line sr_sal;
2426 init_sal (&sr_sal); /* initialize to zeroes */
2427 sr_sal.pc = real_stop_pc;
2428 sr_sal.section = find_pc_overlay (sr_sal.pc);
2430 /* Do not specify what the fp should be when we stop since
2431 on some machines the prologue is where the new fp value
2433 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2435 /* Restart without fiddling with the step ranges or
2442 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2443 the trampoline processing logic, however, there are some trampolines
2444 that have no names, so we should do trampoline handling first. */
2445 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2446 && ecs->stop_func_name == NULL)
2449 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n");
2451 /* The inferior just stepped into, or returned to, an
2452 undebuggable function (where there is no symbol, not even a
2453 minimal symbol, corresponding to the address where the
2454 inferior stopped). Since we want to skip this kind of code,
2455 we keep going until the inferior returns from this
2457 if (step_stop_if_no_debug)
2459 /* If we have no line number and the step-stop-if-no-debug
2460 is set, we stop the step so that the user has a chance to
2461 switch in assembly mode. */
2463 print_stop_reason (END_STEPPING_RANGE, 0);
2464 stop_stepping (ecs);
2469 /* Set a breakpoint at callee's return address (the address
2470 at which the caller will resume). */
2471 insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ()));
2477 if (step_range_end == 1)
2479 /* It is stepi or nexti. We always want to stop stepping after
2482 fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n");
2484 print_stop_reason (END_STEPPING_RANGE, 0);
2485 stop_stepping (ecs);
2489 ecs->sal = find_pc_line (stop_pc, 0);
2491 if (ecs->sal.line == 0)
2493 /* We have no line number information. That means to stop
2494 stepping (does this always happen right after one instruction,
2495 when we do "s" in a function with no line numbers,
2496 or can this happen as a result of a return or longjmp?). */
2498 fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n");
2500 print_stop_reason (END_STEPPING_RANGE, 0);
2501 stop_stepping (ecs);
2505 if ((stop_pc == ecs->sal.pc)
2506 && (ecs->current_line != ecs->sal.line
2507 || ecs->current_symtab != ecs->sal.symtab))
2509 /* We are at the start of a different line. So stop. Note that
2510 we don't stop if we step into the middle of a different line.
2511 That is said to make things like for (;;) statements work
2514 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n");
2516 print_stop_reason (END_STEPPING_RANGE, 0);
2517 stop_stepping (ecs);
2521 /* We aren't done stepping.
2523 Optimize by setting the stepping range to the line.
2524 (We might not be in the original line, but if we entered a
2525 new line in mid-statement, we continue stepping. This makes
2526 things like for(;;) statements work better.) */
2528 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2530 /* If this is the last line of the function, don't keep stepping
2531 (it would probably step us out of the function).
2532 This is particularly necessary for a one-line function,
2533 in which after skipping the prologue we better stop even though
2534 we will be in mid-line. */
2536 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n");
2538 print_stop_reason (END_STEPPING_RANGE, 0);
2539 stop_stepping (ecs);
2542 step_range_start = ecs->sal.pc;
2543 step_range_end = ecs->sal.end;
2544 step_frame_id = get_frame_id (get_current_frame ());
2545 ecs->current_line = ecs->sal.line;
2546 ecs->current_symtab = ecs->sal.symtab;
2548 /* In the case where we just stepped out of a function into the
2549 middle of a line of the caller, continue stepping, but
2550 step_frame_id must be modified to current frame */
2552 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2553 generous. It will trigger on things like a step into a frameless
2554 stackless leaf function. I think the logic should instead look
2555 at the unwound frame ID has that should give a more robust
2556 indication of what happened. */
2557 if (step - ID == current - ID)
2558 still stepping in same function;
2559 else if (step - ID == unwind (current - ID))
2560 stepped into a function;
2562 stepped out of a function;
2563 /* Of course this assumes that the frame ID unwind code is robust
2564 and we're willing to introduce frame unwind logic into this
2565 function. Fortunately, those days are nearly upon us. */
2568 struct frame_id current_frame = get_frame_id (get_current_frame ());
2569 if (!(frame_id_inner (current_frame, step_frame_id)))
2570 step_frame_id = current_frame;
2574 fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n");
2578 /* Are we in the middle of stepping? */
2581 currently_stepping (struct execution_control_state *ecs)
2583 return ((!ecs->handling_longjmp
2584 && ((step_range_end && step_resume_breakpoint == NULL)
2586 || ecs->stepping_through_solib_after_catch
2587 || bpstat_should_step ());
2590 /* Subroutine call with source code we should not step over. Do step
2591 to the first line of code in it. */
2594 step_into_function (struct execution_control_state *ecs)
2597 struct symtab_and_line sr_sal;
2599 s = find_pc_symtab (stop_pc);
2600 if (s && s->language != language_asm)
2601 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2603 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2604 /* Use the step_resume_break to step until the end of the prologue,
2605 even if that involves jumps (as it seems to on the vax under
2607 /* If the prologue ends in the middle of a source line, continue to
2608 the end of that source line (if it is still within the function).
2609 Otherwise, just go to end of prologue. */
2611 && ecs->sal.pc != ecs->stop_func_start
2612 && ecs->sal.end < ecs->stop_func_end)
2613 ecs->stop_func_start = ecs->sal.end;
2615 /* Architectures which require breakpoint adjustment might not be able
2616 to place a breakpoint at the computed address. If so, the test
2617 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2618 ecs->stop_func_start to an address at which a breakpoint may be
2619 legitimately placed.
2621 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2622 made, GDB will enter an infinite loop when stepping through
2623 optimized code consisting of VLIW instructions which contain
2624 subinstructions corresponding to different source lines. On
2625 FR-V, it's not permitted to place a breakpoint on any but the
2626 first subinstruction of a VLIW instruction. When a breakpoint is
2627 set, GDB will adjust the breakpoint address to the beginning of
2628 the VLIW instruction. Thus, we need to make the corresponding
2629 adjustment here when computing the stop address. */
2631 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2633 ecs->stop_func_start
2634 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2635 ecs->stop_func_start);
2638 if (ecs->stop_func_start == stop_pc)
2640 /* We are already there: stop now. */
2642 print_stop_reason (END_STEPPING_RANGE, 0);
2643 stop_stepping (ecs);
2648 /* Put the step-breakpoint there and go until there. */
2649 init_sal (&sr_sal); /* initialize to zeroes */
2650 sr_sal.pc = ecs->stop_func_start;
2651 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2653 /* Do not specify what the fp should be when we stop since on
2654 some machines the prologue is where the new fp value is
2656 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2658 /* And make sure stepping stops right away then. */
2659 step_range_end = step_range_start;
2664 /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID.
2665 This is used to both functions and to skip over code. */
2668 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
2669 struct frame_id sr_id)
2671 /* There should never be more than one step-resume breakpoint per
2672 thread, so we should never be setting a new
2673 step_resume_breakpoint when one is already active. */
2674 gdb_assert (step_resume_breakpoint == NULL);
2675 step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id,
2677 if (breakpoints_inserted)
2678 insert_breakpoints ();
2681 /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used
2682 to skip a function (next, skip-no-debug) or signal. It's assumed
2683 that the function/signal handler being skipped eventually returns
2684 to the breakpoint inserted at RETURN_FRAME.pc.
2686 For the skip-function case, the function may have been reached by
2687 either single stepping a call / return / signal-return instruction,
2688 or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs
2689 to the skip-function's caller.
2691 For the signals case, this is called with the interrupted
2692 function's frame. The signal handler, when it returns, will resume
2693 the interrupted function at RETURN_FRAME.pc. */
2696 insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame)
2698 struct symtab_and_line sr_sal;
2700 init_sal (&sr_sal); /* initialize to zeros */
2702 sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame));
2703 sr_sal.section = find_pc_overlay (sr_sal.pc);
2705 insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame));
2709 stop_stepping (struct execution_control_state *ecs)
2712 fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n");
2714 /* Let callers know we don't want to wait for the inferior anymore. */
2715 ecs->wait_some_more = 0;
2718 /* This function handles various cases where we need to continue
2719 waiting for the inferior. */
2720 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2723 keep_going (struct execution_control_state *ecs)
2725 /* Save the pc before execution, to compare with pc after stop. */
2726 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2728 /* If we did not do break;, it means we should keep running the
2729 inferior and not return to debugger. */
2731 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2733 /* We took a signal (which we are supposed to pass through to
2734 the inferior, else we'd have done a break above) and we
2735 haven't yet gotten our trap. Simply continue. */
2736 resume (currently_stepping (ecs), stop_signal);
2740 /* Either the trap was not expected, but we are continuing
2741 anyway (the user asked that this signal be passed to the
2744 The signal was SIGTRAP, e.g. it was our signal, but we
2745 decided we should resume from it.
2747 We're going to run this baby now! */
2749 if (!breakpoints_inserted && !ecs->another_trap)
2751 breakpoints_failed = insert_breakpoints ();
2752 if (breakpoints_failed)
2754 stop_stepping (ecs);
2757 breakpoints_inserted = 1;
2760 trap_expected = ecs->another_trap;
2762 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2763 specifies that such a signal should be delivered to the
2766 Typically, this would occure when a user is debugging a
2767 target monitor on a simulator: the target monitor sets a
2768 breakpoint; the simulator encounters this break-point and
2769 halts the simulation handing control to GDB; GDB, noteing
2770 that the break-point isn't valid, returns control back to the
2771 simulator; the simulator then delivers the hardware
2772 equivalent of a SIGNAL_TRAP to the program being debugged. */
2774 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2775 stop_signal = TARGET_SIGNAL_0;
2778 resume (currently_stepping (ecs), stop_signal);
2781 prepare_to_wait (ecs);
2784 /* This function normally comes after a resume, before
2785 handle_inferior_event exits. It takes care of any last bits of
2786 housekeeping, and sets the all-important wait_some_more flag. */
2789 prepare_to_wait (struct execution_control_state *ecs)
2792 fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
2793 if (ecs->infwait_state == infwait_normal_state)
2795 overlay_cache_invalid = 1;
2797 /* We have to invalidate the registers BEFORE calling
2798 target_wait because they can be loaded from the target while
2799 in target_wait. This makes remote debugging a bit more
2800 efficient for those targets that provide critical registers
2801 as part of their normal status mechanism. */
2803 registers_changed ();
2804 ecs->waiton_ptid = pid_to_ptid (-1);
2805 ecs->wp = &(ecs->ws);
2807 /* This is the old end of the while loop. Let everybody know we
2808 want to wait for the inferior some more and get called again
2810 ecs->wait_some_more = 1;
2813 /* Print why the inferior has stopped. We always print something when
2814 the inferior exits, or receives a signal. The rest of the cases are
2815 dealt with later on in normal_stop() and print_it_typical(). Ideally
2816 there should be a call to this function from handle_inferior_event()
2817 each time stop_stepping() is called.*/
2819 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2821 switch (stop_reason)
2824 /* We don't deal with these cases from handle_inferior_event()
2827 case END_STEPPING_RANGE:
2828 /* We are done with a step/next/si/ni command. */
2829 /* For now print nothing. */
2830 /* Print a message only if not in the middle of doing a "step n"
2831 operation for n > 1 */
2832 if (!step_multi || !stop_step)
2833 if (ui_out_is_mi_like_p (uiout))
2834 ui_out_field_string (uiout, "reason", "end-stepping-range");
2836 case BREAKPOINT_HIT:
2837 /* We found a breakpoint. */
2838 /* For now print nothing. */
2841 /* The inferior was terminated by a signal. */
2842 annotate_signalled ();
2843 if (ui_out_is_mi_like_p (uiout))
2844 ui_out_field_string (uiout, "reason", "exited-signalled");
2845 ui_out_text (uiout, "\nProgram terminated with signal ");
2846 annotate_signal_name ();
2847 ui_out_field_string (uiout, "signal-name",
2848 target_signal_to_name (stop_info));
2849 annotate_signal_name_end ();
2850 ui_out_text (uiout, ", ");
2851 annotate_signal_string ();
2852 ui_out_field_string (uiout, "signal-meaning",
2853 target_signal_to_string (stop_info));
2854 annotate_signal_string_end ();
2855 ui_out_text (uiout, ".\n");
2856 ui_out_text (uiout, "The program no longer exists.\n");
2859 /* The inferior program is finished. */
2860 annotate_exited (stop_info);
2863 if (ui_out_is_mi_like_p (uiout))
2864 ui_out_field_string (uiout, "reason", "exited");
2865 ui_out_text (uiout, "\nProgram exited with code ");
2866 ui_out_field_fmt (uiout, "exit-code", "0%o",
2867 (unsigned int) stop_info);
2868 ui_out_text (uiout, ".\n");
2872 if (ui_out_is_mi_like_p (uiout))
2873 ui_out_field_string (uiout, "reason", "exited-normally");
2874 ui_out_text (uiout, "\nProgram exited normally.\n");
2877 case SIGNAL_RECEIVED:
2878 /* Signal received. The signal table tells us to print about
2881 ui_out_text (uiout, "\nProgram received signal ");
2882 annotate_signal_name ();
2883 if (ui_out_is_mi_like_p (uiout))
2884 ui_out_field_string (uiout, "reason", "signal-received");
2885 ui_out_field_string (uiout, "signal-name",
2886 target_signal_to_name (stop_info));
2887 annotate_signal_name_end ();
2888 ui_out_text (uiout, ", ");
2889 annotate_signal_string ();
2890 ui_out_field_string (uiout, "signal-meaning",
2891 target_signal_to_string (stop_info));
2892 annotate_signal_string_end ();
2893 ui_out_text (uiout, ".\n");
2896 internal_error (__FILE__, __LINE__,
2897 _("print_stop_reason: unrecognized enum value"));
2903 /* Here to return control to GDB when the inferior stops for real.
2904 Print appropriate messages, remove breakpoints, give terminal our modes.
2906 STOP_PRINT_FRAME nonzero means print the executing frame
2907 (pc, function, args, file, line number and line text).
2908 BREAKPOINTS_FAILED nonzero means stop was due to error
2909 attempting to insert breakpoints. */
2914 struct target_waitstatus last;
2917 get_last_target_status (&last_ptid, &last);
2919 /* As with the notification of thread events, we want to delay
2920 notifying the user that we've switched thread context until
2921 the inferior actually stops.
2923 There's no point in saying anything if the inferior has exited.
2924 Note that SIGNALLED here means "exited with a signal", not
2925 "received a signal". */
2926 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
2927 && target_has_execution
2928 && last.kind != TARGET_WAITKIND_SIGNALLED
2929 && last.kind != TARGET_WAITKIND_EXITED)
2931 target_terminal_ours_for_output ();
2932 printf_filtered (_("[Switching to %s]\n"),
2933 target_pid_or_tid_to_str (inferior_ptid));
2934 previous_inferior_ptid = inferior_ptid;
2937 /* NOTE drow/2004-01-17: Is this still necessary? */
2938 /* Make sure that the current_frame's pc is correct. This
2939 is a correction for setting up the frame info before doing
2940 DECR_PC_AFTER_BREAK */
2941 if (target_has_execution)
2942 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2943 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2944 frame code to check for this and sort out any resultant mess.
2945 DECR_PC_AFTER_BREAK needs to just go away. */
2946 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2948 if (target_has_execution && breakpoints_inserted)
2950 if (remove_breakpoints ())
2952 target_terminal_ours_for_output ();
2953 printf_filtered (_("\
2954 Cannot remove breakpoints because program is no longer writable.\n\
2955 It might be running in another process.\n\
2956 Further execution is probably impossible.\n"));
2959 breakpoints_inserted = 0;
2961 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2962 Delete any breakpoint that is to be deleted at the next stop. */
2964 breakpoint_auto_delete (stop_bpstat);
2966 /* If an auto-display called a function and that got a signal,
2967 delete that auto-display to avoid an infinite recursion. */
2969 if (stopped_by_random_signal)
2970 disable_current_display ();
2972 /* Don't print a message if in the middle of doing a "step n"
2973 operation for n > 1 */
2974 if (step_multi && stop_step)
2977 target_terminal_ours ();
2979 /* Look up the hook_stop and run it (CLI internally handles problem
2980 of stop_command's pre-hook not existing). */
2982 catch_errors (hook_stop_stub, stop_command,
2983 "Error while running hook_stop:\n", RETURN_MASK_ALL);
2985 if (!target_has_stack)
2991 /* Select innermost stack frame - i.e., current frame is frame 0,
2992 and current location is based on that.
2993 Don't do this on return from a stack dummy routine,
2994 or if the program has exited. */
2996 if (!stop_stack_dummy)
2998 select_frame (get_current_frame ());
3000 /* Print current location without a level number, if
3001 we have changed functions or hit a breakpoint.
3002 Print source line if we have one.
3003 bpstat_print() contains the logic deciding in detail
3004 what to print, based on the event(s) that just occurred. */
3006 if (stop_print_frame && deprecated_selected_frame)
3010 int do_frame_printing = 1;
3012 bpstat_ret = bpstat_print (stop_bpstat);
3016 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3017 (or should) carry around the function and does (or
3018 should) use that when doing a frame comparison. */
3020 && frame_id_eq (step_frame_id,
3021 get_frame_id (get_current_frame ()))
3022 && step_start_function == find_pc_function (stop_pc))
3023 source_flag = SRC_LINE; /* finished step, just print source line */
3025 source_flag = SRC_AND_LOC; /* print location and source line */
3027 case PRINT_SRC_AND_LOC:
3028 source_flag = SRC_AND_LOC; /* print location and source line */
3030 case PRINT_SRC_ONLY:
3031 source_flag = SRC_LINE;
3034 source_flag = SRC_LINE; /* something bogus */
3035 do_frame_printing = 0;
3038 internal_error (__FILE__, __LINE__, _("Unknown value."));
3040 /* For mi, have the same behavior every time we stop:
3041 print everything but the source line. */
3042 if (ui_out_is_mi_like_p (uiout))
3043 source_flag = LOC_AND_ADDRESS;
3045 if (ui_out_is_mi_like_p (uiout))
3046 ui_out_field_int (uiout, "thread-id",
3047 pid_to_thread_id (inferior_ptid));
3048 /* The behavior of this routine with respect to the source
3050 SRC_LINE: Print only source line
3051 LOCATION: Print only location
3052 SRC_AND_LOC: Print location and source line */
3053 if (do_frame_printing)
3054 print_stack_frame (get_selected_frame (NULL), 0, source_flag);
3056 /* Display the auto-display expressions. */
3061 /* Save the function value return registers, if we care.
3062 We might be about to restore their previous contents. */
3063 if (proceed_to_finish)
3064 /* NB: The copy goes through to the target picking up the value of
3065 all the registers. */
3066 regcache_cpy (stop_registers, current_regcache);
3068 if (stop_stack_dummy)
3070 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3071 ends with a setting of the current frame, so we can use that
3073 frame_pop (get_current_frame ());
3074 /* Set stop_pc to what it was before we called the function.
3075 Can't rely on restore_inferior_status because that only gets
3076 called if we don't stop in the called function. */
3077 stop_pc = read_pc ();
3078 select_frame (get_current_frame ());
3082 annotate_stopped ();
3083 observer_notify_normal_stop (stop_bpstat);
3087 hook_stop_stub (void *cmd)
3089 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3094 signal_stop_state (int signo)
3096 return signal_stop[signo];
3100 signal_print_state (int signo)
3102 return signal_print[signo];
3106 signal_pass_state (int signo)
3108 return signal_program[signo];
3112 signal_stop_update (int signo, int state)
3114 int ret = signal_stop[signo];
3115 signal_stop[signo] = state;
3120 signal_print_update (int signo, int state)
3122 int ret = signal_print[signo];
3123 signal_print[signo] = state;
3128 signal_pass_update (int signo, int state)
3130 int ret = signal_program[signo];
3131 signal_program[signo] = state;
3136 sig_print_header (void)
3138 printf_filtered (_("\
3139 Signal Stop\tPrint\tPass to program\tDescription\n"));
3143 sig_print_info (enum target_signal oursig)
3145 char *name = target_signal_to_name (oursig);
3146 int name_padding = 13 - strlen (name);
3148 if (name_padding <= 0)
3151 printf_filtered ("%s", name);
3152 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3153 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3154 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3155 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3156 printf_filtered ("%s\n", target_signal_to_string (oursig));
3159 /* Specify how various signals in the inferior should be handled. */
3162 handle_command (char *args, int from_tty)
3165 int digits, wordlen;
3166 int sigfirst, signum, siglast;
3167 enum target_signal oursig;
3170 unsigned char *sigs;
3171 struct cleanup *old_chain;
3175 error_no_arg (_("signal to handle"));
3178 /* Allocate and zero an array of flags for which signals to handle. */
3180 nsigs = (int) TARGET_SIGNAL_LAST;
3181 sigs = (unsigned char *) alloca (nsigs);
3182 memset (sigs, 0, nsigs);
3184 /* Break the command line up into args. */
3186 argv = buildargv (args);
3191 old_chain = make_cleanup_freeargv (argv);
3193 /* Walk through the args, looking for signal oursigs, signal names, and
3194 actions. Signal numbers and signal names may be interspersed with
3195 actions, with the actions being performed for all signals cumulatively
3196 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3198 while (*argv != NULL)
3200 wordlen = strlen (*argv);
3201 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3205 sigfirst = siglast = -1;
3207 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3209 /* Apply action to all signals except those used by the
3210 debugger. Silently skip those. */
3213 siglast = nsigs - 1;
3215 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3217 SET_SIGS (nsigs, sigs, signal_stop);
3218 SET_SIGS (nsigs, sigs, signal_print);
3220 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3222 UNSET_SIGS (nsigs, sigs, signal_program);
3224 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3226 SET_SIGS (nsigs, sigs, signal_print);
3228 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3230 SET_SIGS (nsigs, sigs, signal_program);
3232 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3234 UNSET_SIGS (nsigs, sigs, signal_stop);
3236 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3238 SET_SIGS (nsigs, sigs, signal_program);
3240 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3242 UNSET_SIGS (nsigs, sigs, signal_print);
3243 UNSET_SIGS (nsigs, sigs, signal_stop);
3245 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3247 UNSET_SIGS (nsigs, sigs, signal_program);
3249 else if (digits > 0)
3251 /* It is numeric. The numeric signal refers to our own
3252 internal signal numbering from target.h, not to host/target
3253 signal number. This is a feature; users really should be
3254 using symbolic names anyway, and the common ones like
3255 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3257 sigfirst = siglast = (int)
3258 target_signal_from_command (atoi (*argv));
3259 if ((*argv)[digits] == '-')
3262 target_signal_from_command (atoi ((*argv) + digits + 1));
3264 if (sigfirst > siglast)
3266 /* Bet he didn't figure we'd think of this case... */
3274 oursig = target_signal_from_name (*argv);
3275 if (oursig != TARGET_SIGNAL_UNKNOWN)
3277 sigfirst = siglast = (int) oursig;
3281 /* Not a number and not a recognized flag word => complain. */
3282 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv);
3286 /* If any signal numbers or symbol names were found, set flags for
3287 which signals to apply actions to. */
3289 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3291 switch ((enum target_signal) signum)
3293 case TARGET_SIGNAL_TRAP:
3294 case TARGET_SIGNAL_INT:
3295 if (!allsigs && !sigs[signum])
3297 if (query ("%s is used by the debugger.\n\
3298 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3304 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3305 gdb_flush (gdb_stdout);
3309 case TARGET_SIGNAL_0:
3310 case TARGET_SIGNAL_DEFAULT:
3311 case TARGET_SIGNAL_UNKNOWN:
3312 /* Make sure that "all" doesn't print these. */
3323 target_notice_signals (inferior_ptid);
3327 /* Show the results. */
3328 sig_print_header ();
3329 for (signum = 0; signum < nsigs; signum++)
3333 sig_print_info (signum);
3338 do_cleanups (old_chain);
3342 xdb_handle_command (char *args, int from_tty)
3345 struct cleanup *old_chain;
3347 /* Break the command line up into args. */
3349 argv = buildargv (args);
3354 old_chain = make_cleanup_freeargv (argv);
3355 if (argv[1] != (char *) NULL)
3360 bufLen = strlen (argv[0]) + 20;
3361 argBuf = (char *) xmalloc (bufLen);
3365 enum target_signal oursig;
3367 oursig = target_signal_from_name (argv[0]);
3368 memset (argBuf, 0, bufLen);
3369 if (strcmp (argv[1], "Q") == 0)
3370 sprintf (argBuf, "%s %s", argv[0], "noprint");
3373 if (strcmp (argv[1], "s") == 0)
3375 if (!signal_stop[oursig])
3376 sprintf (argBuf, "%s %s", argv[0], "stop");
3378 sprintf (argBuf, "%s %s", argv[0], "nostop");
3380 else if (strcmp (argv[1], "i") == 0)
3382 if (!signal_program[oursig])
3383 sprintf (argBuf, "%s %s", argv[0], "pass");
3385 sprintf (argBuf, "%s %s", argv[0], "nopass");
3387 else if (strcmp (argv[1], "r") == 0)
3389 if (!signal_print[oursig])
3390 sprintf (argBuf, "%s %s", argv[0], "print");
3392 sprintf (argBuf, "%s %s", argv[0], "noprint");
3398 handle_command (argBuf, from_tty);
3400 printf_filtered (_("Invalid signal handling flag.\n"));
3405 do_cleanups (old_chain);
3408 /* Print current contents of the tables set by the handle command.
3409 It is possible we should just be printing signals actually used
3410 by the current target (but for things to work right when switching
3411 targets, all signals should be in the signal tables). */
3414 signals_info (char *signum_exp, int from_tty)
3416 enum target_signal oursig;
3417 sig_print_header ();
3421 /* First see if this is a symbol name. */
3422 oursig = target_signal_from_name (signum_exp);
3423 if (oursig == TARGET_SIGNAL_UNKNOWN)
3425 /* No, try numeric. */
3427 target_signal_from_command (parse_and_eval_long (signum_exp));
3429 sig_print_info (oursig);
3433 printf_filtered ("\n");
3434 /* These ugly casts brought to you by the native VAX compiler. */
3435 for (oursig = TARGET_SIGNAL_FIRST;
3436 (int) oursig < (int) TARGET_SIGNAL_LAST;
3437 oursig = (enum target_signal) ((int) oursig + 1))
3441 if (oursig != TARGET_SIGNAL_UNKNOWN
3442 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3443 sig_print_info (oursig);
3446 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3449 struct inferior_status
3451 enum target_signal stop_signal;
3455 int stop_stack_dummy;
3456 int stopped_by_random_signal;
3458 CORE_ADDR step_range_start;
3459 CORE_ADDR step_range_end;
3460 struct frame_id step_frame_id;
3461 enum step_over_calls_kind step_over_calls;
3462 CORE_ADDR step_resume_break_address;
3463 int stop_after_trap;
3465 struct regcache *stop_registers;
3467 /* These are here because if call_function_by_hand has written some
3468 registers and then decides to call error(), we better not have changed
3470 struct regcache *registers;
3472 /* A frame unique identifier. */
3473 struct frame_id selected_frame_id;
3475 int breakpoint_proceeded;
3476 int restore_stack_info;
3477 int proceed_to_finish;
3481 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3484 int size = register_size (current_gdbarch, regno);
3485 void *buf = alloca (size);
3486 store_signed_integer (buf, size, val);
3487 regcache_raw_write (inf_status->registers, regno, buf);
3490 /* Save all of the information associated with the inferior<==>gdb
3491 connection. INF_STATUS is a pointer to a "struct inferior_status"
3492 (defined in inferior.h). */
3494 struct inferior_status *
3495 save_inferior_status (int restore_stack_info)
3497 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3499 inf_status->stop_signal = stop_signal;
3500 inf_status->stop_pc = stop_pc;
3501 inf_status->stop_step = stop_step;
3502 inf_status->stop_stack_dummy = stop_stack_dummy;
3503 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3504 inf_status->trap_expected = trap_expected;
3505 inf_status->step_range_start = step_range_start;
3506 inf_status->step_range_end = step_range_end;
3507 inf_status->step_frame_id = step_frame_id;
3508 inf_status->step_over_calls = step_over_calls;
3509 inf_status->stop_after_trap = stop_after_trap;
3510 inf_status->stop_soon = stop_soon;
3511 /* Save original bpstat chain here; replace it with copy of chain.
3512 If caller's caller is walking the chain, they'll be happier if we
3513 hand them back the original chain when restore_inferior_status is
3515 inf_status->stop_bpstat = stop_bpstat;
3516 stop_bpstat = bpstat_copy (stop_bpstat);
3517 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3518 inf_status->restore_stack_info = restore_stack_info;
3519 inf_status->proceed_to_finish = proceed_to_finish;
3521 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3523 inf_status->registers = regcache_dup (current_regcache);
3525 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3530 restore_selected_frame (void *args)
3532 struct frame_id *fid = (struct frame_id *) args;
3533 struct frame_info *frame;
3535 frame = frame_find_by_id (*fid);
3537 /* If inf_status->selected_frame_id is NULL, there was no previously
3541 warning (_("Unable to restore previously selected frame."));
3545 select_frame (frame);
3551 restore_inferior_status (struct inferior_status *inf_status)
3553 stop_signal = inf_status->stop_signal;
3554 stop_pc = inf_status->stop_pc;
3555 stop_step = inf_status->stop_step;
3556 stop_stack_dummy = inf_status->stop_stack_dummy;
3557 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3558 trap_expected = inf_status->trap_expected;
3559 step_range_start = inf_status->step_range_start;
3560 step_range_end = inf_status->step_range_end;
3561 step_frame_id = inf_status->step_frame_id;
3562 step_over_calls = inf_status->step_over_calls;
3563 stop_after_trap = inf_status->stop_after_trap;
3564 stop_soon = inf_status->stop_soon;
3565 bpstat_clear (&stop_bpstat);
3566 stop_bpstat = inf_status->stop_bpstat;
3567 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3568 proceed_to_finish = inf_status->proceed_to_finish;
3570 /* FIXME: Is the restore of stop_registers always needed. */
3571 regcache_xfree (stop_registers);
3572 stop_registers = inf_status->stop_registers;
3574 /* The inferior can be gone if the user types "print exit(0)"
3575 (and perhaps other times). */
3576 if (target_has_execution)
3577 /* NB: The register write goes through to the target. */
3578 regcache_cpy (current_regcache, inf_status->registers);
3579 regcache_xfree (inf_status->registers);
3581 /* FIXME: If we are being called after stopping in a function which
3582 is called from gdb, we should not be trying to restore the
3583 selected frame; it just prints a spurious error message (The
3584 message is useful, however, in detecting bugs in gdb (like if gdb
3585 clobbers the stack)). In fact, should we be restoring the
3586 inferior status at all in that case? . */
3588 if (target_has_stack && inf_status->restore_stack_info)
3590 /* The point of catch_errors is that if the stack is clobbered,
3591 walking the stack might encounter a garbage pointer and
3592 error() trying to dereference it. */
3594 (restore_selected_frame, &inf_status->selected_frame_id,
3595 "Unable to restore previously selected frame:\n",
3596 RETURN_MASK_ERROR) == 0)
3597 /* Error in restoring the selected frame. Select the innermost
3599 select_frame (get_current_frame ());
3607 do_restore_inferior_status_cleanup (void *sts)
3609 restore_inferior_status (sts);
3613 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3615 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3619 discard_inferior_status (struct inferior_status *inf_status)
3621 /* See save_inferior_status for info on stop_bpstat. */
3622 bpstat_clear (&inf_status->stop_bpstat);
3623 regcache_xfree (inf_status->registers);
3624 regcache_xfree (inf_status->stop_registers);
3629 inferior_has_forked (int pid, int *child_pid)
3631 struct target_waitstatus last;
3634 get_last_target_status (&last_ptid, &last);
3636 if (last.kind != TARGET_WAITKIND_FORKED)
3639 if (ptid_get_pid (last_ptid) != pid)
3642 *child_pid = last.value.related_pid;
3647 inferior_has_vforked (int pid, int *child_pid)
3649 struct target_waitstatus last;
3652 get_last_target_status (&last_ptid, &last);
3654 if (last.kind != TARGET_WAITKIND_VFORKED)
3657 if (ptid_get_pid (last_ptid) != pid)
3660 *child_pid = last.value.related_pid;
3665 inferior_has_execd (int pid, char **execd_pathname)
3667 struct target_waitstatus last;
3670 get_last_target_status (&last_ptid, &last);
3672 if (last.kind != TARGET_WAITKIND_EXECD)
3675 if (ptid_get_pid (last_ptid) != pid)
3678 *execd_pathname = xstrdup (last.value.execd_pathname);
3682 /* Oft used ptids */
3684 ptid_t minus_one_ptid;
3686 /* Create a ptid given the necessary PID, LWP, and TID components. */
3689 ptid_build (int pid, long lwp, long tid)
3699 /* Create a ptid from just a pid. */
3702 pid_to_ptid (int pid)
3704 return ptid_build (pid, 0, 0);
3707 /* Fetch the pid (process id) component from a ptid. */
3710 ptid_get_pid (ptid_t ptid)
3715 /* Fetch the lwp (lightweight process) component from a ptid. */
3718 ptid_get_lwp (ptid_t ptid)
3723 /* Fetch the tid (thread id) component from a ptid. */
3726 ptid_get_tid (ptid_t ptid)
3731 /* ptid_equal() is used to test equality of two ptids. */
3734 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3736 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3737 && ptid1.tid == ptid2.tid);
3740 /* restore_inferior_ptid() will be used by the cleanup machinery
3741 to restore the inferior_ptid value saved in a call to
3742 save_inferior_ptid(). */
3745 restore_inferior_ptid (void *arg)
3747 ptid_t *saved_ptid_ptr = arg;
3748 inferior_ptid = *saved_ptid_ptr;
3752 /* Save the value of inferior_ptid so that it may be restored by a
3753 later call to do_cleanups(). Returns the struct cleanup pointer
3754 needed for later doing the cleanup. */
3757 save_inferior_ptid (void)
3759 ptid_t *saved_ptid_ptr;
3761 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3762 *saved_ptid_ptr = inferior_ptid;
3763 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3770 stop_registers = regcache_xmalloc (current_gdbarch);
3774 _initialize_infrun (void)
3778 struct cmd_list_element *c;
3780 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers);
3781 deprecated_register_gdbarch_swap (NULL, 0, build_infrun);
3783 add_info ("signals", signals_info, _("\
3784 What debugger does when program gets various signals.\n\
3785 Specify a signal as argument to print info on that signal only."));
3786 add_info_alias ("handle", "signals", 0);
3788 add_com ("handle", class_run, handle_command, _("\
3789 Specify how to handle a signal.\n\
3790 Args are signals and actions to apply to those signals.\n\
3791 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3792 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3793 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3794 The special arg \"all\" is recognized to mean all signals except those\n\
3795 used by the debugger, typically SIGTRAP and SIGINT.\n\
3796 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3797 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3798 Stop means reenter debugger if this signal happens (implies print).\n\
3799 Print means print a message if this signal happens.\n\
3800 Pass means let program see this signal; otherwise program doesn't know.\n\
3801 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3802 Pass and Stop may be combined."));
3805 add_com ("lz", class_info, signals_info, _("\
3806 What debugger does when program gets various signals.\n\
3807 Specify a signal as argument to print info on that signal only."));
3808 add_com ("z", class_run, xdb_handle_command, _("\
3809 Specify how to handle a signal.\n\
3810 Args are signals and actions to apply to those signals.\n\
3811 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3812 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3813 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3814 The special arg \"all\" is recognized to mean all signals except those\n\
3815 used by the debugger, typically SIGTRAP and SIGINT.\n\
3816 Recognized actions include \"s\" (toggles between stop and nostop), \n\
3817 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3818 nopass), \"Q\" (noprint)\n\
3819 Stop means reenter debugger if this signal happens (implies print).\n\
3820 Print means print a message if this signal happens.\n\
3821 Pass means let program see this signal; otherwise program doesn't know.\n\
3822 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3823 Pass and Stop may be combined."));
3827 stop_command = add_cmd ("stop", class_obscure,
3828 not_just_help_class_command, _("\
3829 There is no `stop' command, but you can set a hook on `stop'.\n\
3830 This allows you to set a list of commands to be run each time execution\n\
3831 of the program stops."), &cmdlist);
3833 add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\
3834 Set inferior debugging."), _("\
3835 Show inferior debugging."), _("\
3836 When non-zero, inferior specific debugging is enabled."),
3838 NULL, /* FIXME: i18n: */
3839 &setdebuglist, &showdebuglist);
3841 numsigs = (int) TARGET_SIGNAL_LAST;
3842 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
3843 signal_print = (unsigned char *)
3844 xmalloc (sizeof (signal_print[0]) * numsigs);
3845 signal_program = (unsigned char *)
3846 xmalloc (sizeof (signal_program[0]) * numsigs);
3847 for (i = 0; i < numsigs; i++)
3850 signal_print[i] = 1;
3851 signal_program[i] = 1;
3854 /* Signals caused by debugger's own actions
3855 should not be given to the program afterwards. */
3856 signal_program[TARGET_SIGNAL_TRAP] = 0;
3857 signal_program[TARGET_SIGNAL_INT] = 0;
3859 /* Signals that are not errors should not normally enter the debugger. */
3860 signal_stop[TARGET_SIGNAL_ALRM] = 0;
3861 signal_print[TARGET_SIGNAL_ALRM] = 0;
3862 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
3863 signal_print[TARGET_SIGNAL_VTALRM] = 0;
3864 signal_stop[TARGET_SIGNAL_PROF] = 0;
3865 signal_print[TARGET_SIGNAL_PROF] = 0;
3866 signal_stop[TARGET_SIGNAL_CHLD] = 0;
3867 signal_print[TARGET_SIGNAL_CHLD] = 0;
3868 signal_stop[TARGET_SIGNAL_IO] = 0;
3869 signal_print[TARGET_SIGNAL_IO] = 0;
3870 signal_stop[TARGET_SIGNAL_POLL] = 0;
3871 signal_print[TARGET_SIGNAL_POLL] = 0;
3872 signal_stop[TARGET_SIGNAL_URG] = 0;
3873 signal_print[TARGET_SIGNAL_URG] = 0;
3874 signal_stop[TARGET_SIGNAL_WINCH] = 0;
3875 signal_print[TARGET_SIGNAL_WINCH] = 0;
3877 /* These signals are used internally by user-level thread
3878 implementations. (See signal(5) on Solaris.) Like the above
3879 signals, a healthy program receives and handles them as part of
3880 its normal operation. */
3881 signal_stop[TARGET_SIGNAL_LWP] = 0;
3882 signal_print[TARGET_SIGNAL_LWP] = 0;
3883 signal_stop[TARGET_SIGNAL_WAITING] = 0;
3884 signal_print[TARGET_SIGNAL_WAITING] = 0;
3885 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
3886 signal_print[TARGET_SIGNAL_CANCEL] = 0;
3889 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support,
3890 &stop_on_solib_events, _("\
3891 Set stopping for shared library events."), _("\
3892 Show stopping for shared library events."), _("\
3893 If nonzero, gdb will give control to the user when the dynamic linker\n\
3894 notifies gdb of shared library events. The most common event of interest\n\
3895 to the user would be loading/unloading of a new library."),
3897 NULL, /* FIXME: i18n: */
3898 &setlist, &showlist);
3901 add_setshow_enum_cmd ("follow-fork-mode", class_run,
3902 follow_fork_mode_kind_names,
3903 &follow_fork_mode_string, _("\
3904 Set debugger response to a program call of fork or vfork."), _("\
3905 Show debugger response to a program call of fork or vfork."), _("\
3906 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3907 parent - the original process is debugged after a fork\n\
3908 child - the new process is debugged after a fork\n\
3909 The unfollowed process will continue to run.\n\
3910 By default, the debugger will follow the parent process."),
3912 NULL, /* FIXME: i18n: */
3913 &setlist, &showlist);
3915 add_setshow_enum_cmd ("scheduler-locking", class_run,
3916 scheduler_enums, &scheduler_mode, _("\
3917 Set mode for locking scheduler during execution."), _("\
3918 Show mode for locking scheduler during execution."), _("\
3919 off == no locking (threads may preempt at any time)\n\
3920 on == full locking (no thread except the current thread may run)\n\
3921 step == scheduler locked during every single-step operation.\n\
3922 In this mode, no other thread may run during a step command.\n\
3923 Other threads may run while stepping over a function call ('next')."),
3924 set_schedlock_func, /* traps on target vector */
3925 NULL, /* FIXME: i18n: */
3926 &setlist, &showlist);
3928 add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\
3929 Set mode of the step operation."), _("\
3930 Show mode of the step operation."), _("\
3931 When set, doing a step over a function without debug line information\n\
3932 will stop at the first instruction of that function. Otherwise, the\n\
3933 function is skipped and the step command stops at a different source line."),
3935 NULL, /* FIXME: i18n: */
3936 &setlist, &showlist);
3938 /* ptid initializations */
3939 null_ptid = ptid_build (0, 0, 0);
3940 minus_one_ptid = ptid_build (-1, 0, 0);
3941 inferior_ptid = null_ptid;
3942 target_last_wait_ptid = minus_one_ptid;