1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
6 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
26 #include "gdb_string.h"
31 #include "exceptions.h"
32 #include "breakpoint.h"
36 #include "cli/cli-script.h"
38 #include "gdbthread.h"
51 #include "gdb_assert.h"
52 #include "mi/mi-common.h"
54 /* Prototypes for local functions */
56 static void signals_info (char *, int);
58 static void handle_command (char *, int);
60 static void sig_print_info (enum target_signal);
62 static void sig_print_header (void);
64 static void resume_cleanups (void *);
66 static int hook_stop_stub (void *);
68 static int restore_selected_frame (void *);
70 static void build_infrun (void);
72 static int follow_fork (void);
74 static void set_schedlock_func (char *args, int from_tty,
75 struct cmd_list_element *c);
77 struct execution_control_state;
79 static int currently_stepping (struct execution_control_state *ecs);
81 static void xdb_handle_command (char *args, int from_tty);
83 static int prepare_to_proceed (void);
85 void _initialize_infrun (void);
87 int inferior_ignoring_startup_exec_events = 0;
88 int inferior_ignoring_leading_exec_events = 0;
90 /* When set, stop the 'step' command if we enter a function which has
91 no line number information. The normal behavior is that we step
92 over such function. */
93 int step_stop_if_no_debug = 0;
95 show_step_stop_if_no_debug (struct ui_file *file, int from_tty,
96 struct cmd_list_element *c, const char *value)
98 fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value);
101 /* In asynchronous mode, but simulating synchronous execution. */
103 int sync_execution = 0;
105 /* wait_for_inferior and normal_stop use this to notify the user
106 when the inferior stopped in a different thread than it had been
109 static ptid_t previous_inferior_ptid;
111 /* This is true for configurations that may follow through execl() and
112 similar functions. At present this is only true for HP-UX native. */
114 #ifndef MAY_FOLLOW_EXEC
115 #define MAY_FOLLOW_EXEC (0)
118 static int may_follow_exec = MAY_FOLLOW_EXEC;
120 static int debug_infrun = 0;
122 show_debug_infrun (struct ui_file *file, int from_tty,
123 struct cmd_list_element *c, const char *value)
125 fprintf_filtered (file, _("Inferior debugging is %s.\n"), value);
128 /* If the program uses ELF-style shared libraries, then calls to
129 functions in shared libraries go through stubs, which live in a
130 table called the PLT (Procedure Linkage Table). The first time the
131 function is called, the stub sends control to the dynamic linker,
132 which looks up the function's real address, patches the stub so
133 that future calls will go directly to the function, and then passes
134 control to the function.
136 If we are stepping at the source level, we don't want to see any of
137 this --- we just want to skip over the stub and the dynamic linker.
138 The simple approach is to single-step until control leaves the
141 However, on some systems (e.g., Red Hat's 5.2 distribution) the
142 dynamic linker calls functions in the shared C library, so you
143 can't tell from the PC alone whether the dynamic linker is still
144 running. In this case, we use a step-resume breakpoint to get us
145 past the dynamic linker, as if we were using "next" to step over a
148 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
149 linker code or not. Normally, this means we single-step. However,
150 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
151 address where we can place a step-resume breakpoint to get past the
152 linker's symbol resolution function.
154 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
155 pretty portable way, by comparing the PC against the address ranges
156 of the dynamic linker's sections.
158 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
159 it depends on internal details of the dynamic linker. It's usually
160 not too hard to figure out where to put a breakpoint, but it
161 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
162 sanity checking. If it can't figure things out, returning zero and
163 getting the (possibly confusing) stepping behavior is better than
164 signalling an error, which will obscure the change in the
167 /* This function returns TRUE if pc is the address of an instruction
168 that lies within the dynamic linker (such as the event hook, or the
171 This function must be used only when a dynamic linker event has
172 been caught, and the inferior is being stepped out of the hook, or
173 undefined results are guaranteed. */
175 #ifndef SOLIB_IN_DYNAMIC_LINKER
176 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
180 /* Convert the #defines into values. This is temporary until wfi control
181 flow is completely sorted out. */
183 #ifndef CANNOT_STEP_HW_WATCHPOINTS
184 #define CANNOT_STEP_HW_WATCHPOINTS 0
186 #undef CANNOT_STEP_HW_WATCHPOINTS
187 #define CANNOT_STEP_HW_WATCHPOINTS 1
190 /* Tables of how to react to signals; the user sets them. */
192 static unsigned char *signal_stop;
193 static unsigned char *signal_print;
194 static unsigned char *signal_program;
196 #define SET_SIGS(nsigs,sigs,flags) \
198 int signum = (nsigs); \
199 while (signum-- > 0) \
200 if ((sigs)[signum]) \
201 (flags)[signum] = 1; \
204 #define UNSET_SIGS(nsigs,sigs,flags) \
206 int signum = (nsigs); \
207 while (signum-- > 0) \
208 if ((sigs)[signum]) \
209 (flags)[signum] = 0; \
212 /* Value to pass to target_resume() to cause all threads to resume */
214 #define RESUME_ALL (pid_to_ptid (-1))
216 /* Command list pointer for the "stop" placeholder. */
218 static struct cmd_list_element *stop_command;
220 /* Nonzero if breakpoints are now inserted in the inferior. */
222 static int breakpoints_inserted;
224 /* Function inferior was in as of last step command. */
226 static struct symbol *step_start_function;
228 /* Nonzero if we are expecting a trace trap and should proceed from it. */
230 static int trap_expected;
232 /* Nonzero if we want to give control to the user when we're notified
233 of shared library events by the dynamic linker. */
234 static int stop_on_solib_events;
236 show_stop_on_solib_events (struct ui_file *file, int from_tty,
237 struct cmd_list_element *c, const char *value)
239 fprintf_filtered (file, _("Stopping for shared library events is %s.\n"),
243 /* Nonzero means expecting a trace trap
244 and should stop the inferior and return silently when it happens. */
248 /* Nonzero means expecting a trap and caller will handle it themselves.
249 It is used after attach, due to attaching to a process;
250 when running in the shell before the child program has been exec'd;
251 and when running some kinds of remote stuff (FIXME?). */
253 enum stop_kind stop_soon;
255 /* Nonzero if proceed is being used for a "finish" command or a similar
256 situation when stop_registers should be saved. */
258 int proceed_to_finish;
260 /* Save register contents here when about to pop a stack dummy frame,
261 if-and-only-if proceed_to_finish is set.
262 Thus this contains the return value from the called function (assuming
263 values are returned in a register). */
265 struct regcache *stop_registers;
267 /* Nonzero after stop if current stack frame should be printed. */
269 static int stop_print_frame;
271 static struct breakpoint *step_resume_breakpoint = NULL;
273 /* This is a cached copy of the pid/waitstatus of the last event
274 returned by target_wait()/deprecated_target_wait_hook(). This
275 information is returned by get_last_target_status(). */
276 static ptid_t target_last_wait_ptid;
277 static struct target_waitstatus target_last_waitstatus;
279 /* This is used to remember when a fork, vfork or exec event
280 was caught by a catchpoint, and thus the event is to be
281 followed at the next resume of the inferior, and not
285 enum target_waitkind kind;
292 char *execd_pathname;
296 static const char follow_fork_mode_child[] = "child";
297 static const char follow_fork_mode_parent[] = "parent";
299 static const char *follow_fork_mode_kind_names[] = {
300 follow_fork_mode_child,
301 follow_fork_mode_parent,
305 static const char *follow_fork_mode_string = follow_fork_mode_parent;
307 show_follow_fork_mode_string (struct ui_file *file, int from_tty,
308 struct cmd_list_element *c, const char *value)
310 fprintf_filtered (file, _("\
311 Debugger response to a program call of fork or vfork is \"%s\".\n"),
319 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
321 return target_follow_fork (follow_child);
325 follow_inferior_reset_breakpoints (void)
327 /* Was there a step_resume breakpoint? (There was if the user
328 did a "next" at the fork() call.) If so, explicitly reset its
331 step_resumes are a form of bp that are made to be per-thread.
332 Since we created the step_resume bp when the parent process
333 was being debugged, and now are switching to the child process,
334 from the breakpoint package's viewpoint, that's a switch of
335 "threads". We must update the bp's notion of which thread
336 it is for, or it'll be ignored when it triggers. */
338 if (step_resume_breakpoint)
339 breakpoint_re_set_thread (step_resume_breakpoint);
341 /* Reinsert all breakpoints in the child. The user may have set
342 breakpoints after catching the fork, in which case those
343 were never set in the child, but only in the parent. This makes
344 sure the inserted breakpoints match the breakpoint list. */
346 breakpoint_re_set ();
347 insert_breakpoints ();
350 /* EXECD_PATHNAME is assumed to be non-NULL. */
353 follow_exec (int pid, char *execd_pathname)
356 struct target_ops *tgt;
358 if (!may_follow_exec)
361 /* This is an exec event that we actually wish to pay attention to.
362 Refresh our symbol table to the newly exec'd program, remove any
365 If there are breakpoints, they aren't really inserted now,
366 since the exec() transformed our inferior into a fresh set
369 We want to preserve symbolic breakpoints on the list, since
370 we have hopes that they can be reset after the new a.out's
371 symbol table is read.
373 However, any "raw" breakpoints must be removed from the list
374 (e.g., the solib bp's), since their address is probably invalid
377 And, we DON'T want to call delete_breakpoints() here, since
378 that may write the bp's "shadow contents" (the instruction
379 value that was overwritten witha TRAP instruction). Since
380 we now have a new a.out, those shadow contents aren't valid. */
381 update_breakpoints_after_exec ();
383 /* If there was one, it's gone now. We cannot truly step-to-next
384 statement through an exec(). */
385 step_resume_breakpoint = NULL;
386 step_range_start = 0;
389 /* What is this a.out's name? */
390 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname);
392 /* We've followed the inferior through an exec. Therefore, the
393 inferior has essentially been killed & reborn. */
395 /* First collect the run target in effect. */
396 tgt = find_run_target ();
397 /* If we can't find one, things are in a very strange state... */
399 error (_("Could find run target to save before following exec"));
401 gdb_flush (gdb_stdout);
402 target_mourn_inferior ();
403 inferior_ptid = pid_to_ptid (saved_pid);
404 /* Because mourn_inferior resets inferior_ptid. */
407 /* That a.out is now the one to use. */
408 exec_file_attach (execd_pathname, 0);
410 /* And also is where symbols can be found. */
411 symbol_file_add_main (execd_pathname, 0);
413 /* Reset the shared library package. This ensures that we get
414 a shlib event when the child reaches "_start", at which point
415 the dld will have had a chance to initialize the child. */
416 #if defined(SOLIB_RESTART)
419 #ifdef SOLIB_CREATE_INFERIOR_HOOK
420 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
422 solib_create_inferior_hook ();
425 /* Reinsert all breakpoints. (Those which were symbolic have
426 been reset to the proper address in the new a.out, thanks
427 to symbol_file_command...) */
428 insert_breakpoints ();
430 /* The next resume of this inferior should bring it to the shlib
431 startup breakpoints. (If the user had also set bp's on
432 "main" from the old (parent) process, then they'll auto-
433 matically get reset there in the new process.) */
436 /* Non-zero if we just simulating a single-step. This is needed
437 because we cannot remove the breakpoints in the inferior process
438 until after the `wait' in `wait_for_inferior'. */
439 static int singlestep_breakpoints_inserted_p = 0;
441 /* The thread we inserted single-step breakpoints for. */
442 static ptid_t singlestep_ptid;
444 /* PC when we started this single-step. */
445 static CORE_ADDR singlestep_pc;
447 /* If another thread hit the singlestep breakpoint, we save the original
448 thread here so that we can resume single-stepping it later. */
449 static ptid_t saved_singlestep_ptid;
450 static int stepping_past_singlestep_breakpoint;
453 /* Things to clean up if we QUIT out of resume (). */
455 resume_cleanups (void *ignore)
460 static const char schedlock_off[] = "off";
461 static const char schedlock_on[] = "on";
462 static const char schedlock_step[] = "step";
463 static const char *scheduler_enums[] = {
469 static const char *scheduler_mode = schedlock_off;
471 show_scheduler_mode (struct ui_file *file, int from_tty,
472 struct cmd_list_element *c, const char *value)
474 fprintf_filtered (file, _("\
475 Mode for locking scheduler during execution is \"%s\".\n"),
480 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
482 if (!target_can_lock_scheduler)
484 scheduler_mode = schedlock_off;
485 error (_("Target '%s' cannot support this command."), target_shortname);
490 /* Resume the inferior, but allow a QUIT. This is useful if the user
491 wants to interrupt some lengthy single-stepping operation
492 (for child processes, the SIGINT goes to the inferior, and so
493 we get a SIGINT random_signal, but for remote debugging and perhaps
494 other targets, that's not true).
496 STEP nonzero if we should step (zero to continue instead).
497 SIG is the signal to give the inferior (zero for none). */
499 resume (int step, enum target_signal sig)
501 int should_resume = 1;
502 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
506 fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n",
509 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
512 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
513 over an instruction that causes a page fault without triggering
514 a hardware watchpoint. The kernel properly notices that it shouldn't
515 stop, because the hardware watchpoint is not triggered, but it forgets
516 the step request and continues the program normally.
517 Work around the problem by removing hardware watchpoints if a step is
518 requested, GDB will check for a hardware watchpoint trigger after the
520 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
521 remove_hw_watchpoints ();
524 /* Normally, by the time we reach `resume', the breakpoints are either
525 removed or inserted, as appropriate. The exception is if we're sitting
526 at a permanent breakpoint; we need to step over it, but permanent
527 breakpoints can't be removed. So we have to test for it here. */
528 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
530 if (gdbarch_skip_permanent_breakpoint_p (current_gdbarch))
531 gdbarch_skip_permanent_breakpoint (current_gdbarch, current_regcache);
534 The program is stopped at a permanent breakpoint, but GDB does not know\n\
535 how to step past a permanent breakpoint on this architecture. Try using\n\
536 a command like `return' or `jump' to continue execution."));
539 if (SOFTWARE_SINGLE_STEP_P () && step)
541 /* Do it the hard way, w/temp breakpoints */
542 if (SOFTWARE_SINGLE_STEP (current_regcache))
544 /* ...and don't ask hardware to do it. */
546 /* and do not pull these breakpoints until after a `wait' in
547 `wait_for_inferior' */
548 singlestep_breakpoints_inserted_p = 1;
549 singlestep_ptid = inferior_ptid;
550 singlestep_pc = read_pc ();
554 /* If there were any forks/vforks/execs that were caught and are
555 now to be followed, then do so. */
556 switch (pending_follow.kind)
558 case TARGET_WAITKIND_FORKED:
559 case TARGET_WAITKIND_VFORKED:
560 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
565 case TARGET_WAITKIND_EXECD:
566 /* follow_exec is called as soon as the exec event is seen. */
567 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
574 /* Install inferior's terminal modes. */
575 target_terminal_inferior ();
581 resume_ptid = RESUME_ALL; /* Default */
583 if ((step || singlestep_breakpoints_inserted_p)
584 && (stepping_past_singlestep_breakpoint
585 || (!breakpoints_inserted && breakpoint_here_p (read_pc ()))))
587 /* Stepping past a breakpoint without inserting breakpoints.
588 Make sure only the current thread gets to step, so that
589 other threads don't sneak past breakpoints while they are
592 resume_ptid = inferior_ptid;
595 if ((scheduler_mode == schedlock_on)
596 || (scheduler_mode == schedlock_step
597 && (step || singlestep_breakpoints_inserted_p)))
599 /* User-settable 'scheduler' mode requires solo thread resume. */
600 resume_ptid = inferior_ptid;
603 if (gdbarch_cannot_step_breakpoint (current_gdbarch))
605 /* Most targets can step a breakpoint instruction, thus
606 executing it normally. But if this one cannot, just
607 continue and we will hit it anyway. */
608 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
611 target_resume (resume_ptid, step, sig);
614 discard_cleanups (old_cleanups);
618 /* Clear out all variables saying what to do when inferior is continued.
619 First do this, then set the ones you want, then call `proceed'. */
622 clear_proceed_status (void)
625 step_range_start = 0;
627 step_frame_id = null_frame_id;
628 step_over_calls = STEP_OVER_UNDEBUGGABLE;
630 stop_soon = NO_STOP_QUIETLY;
631 proceed_to_finish = 0;
632 breakpoint_proceeded = 1; /* We're about to proceed... */
634 /* Discard any remaining commands or status from previous stop. */
635 bpstat_clear (&stop_bpstat);
638 /* This should be suitable for any targets that support threads. */
641 prepare_to_proceed (void)
644 struct target_waitstatus wait_status;
646 /* Get the last target status returned by target_wait(). */
647 get_last_target_status (&wait_ptid, &wait_status);
649 /* Make sure we were stopped either at a breakpoint, or because
651 if (wait_status.kind != TARGET_WAITKIND_STOPPED
652 || (wait_status.value.sig != TARGET_SIGNAL_TRAP
653 && wait_status.value.sig != TARGET_SIGNAL_INT))
658 if (!ptid_equal (wait_ptid, minus_one_ptid)
659 && !ptid_equal (inferior_ptid, wait_ptid))
661 /* Switched over from WAIT_PID. */
662 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
664 if (wait_pc != read_pc ())
666 /* Switch back to WAIT_PID thread. */
667 inferior_ptid = wait_ptid;
669 /* FIXME: This stuff came from switch_to_thread() in
670 thread.c (which should probably be a public function). */
671 reinit_frame_cache ();
672 registers_changed ();
676 /* We return 1 to indicate that there is a breakpoint here,
677 so we need to step over it before continuing to avoid
678 hitting it straight away. */
679 if (breakpoint_here_p (wait_pc))
687 /* Record the pc of the program the last time it stopped. This is
688 just used internally by wait_for_inferior, but need to be preserved
689 over calls to it and cleared when the inferior is started. */
690 static CORE_ADDR prev_pc;
692 /* Basic routine for continuing the program in various fashions.
694 ADDR is the address to resume at, or -1 for resume where stopped.
695 SIGGNAL is the signal to give it, or 0 for none,
696 or -1 for act according to how it stopped.
697 STEP is nonzero if should trap after one instruction.
698 -1 means return after that and print nothing.
699 You should probably set various step_... variables
700 before calling here, if you are stepping.
702 You should call clear_proceed_status before calling proceed. */
705 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
710 step_start_function = find_pc_function (read_pc ());
714 if (addr == (CORE_ADDR) -1)
716 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
717 /* There is a breakpoint at the address we will resume at,
718 step one instruction before inserting breakpoints so that
719 we do not stop right away (and report a second hit at this
722 else if (gdbarch_single_step_through_delay_p (current_gdbarch)
723 && gdbarch_single_step_through_delay (current_gdbarch,
724 get_current_frame ()))
725 /* We stepped onto an instruction that needs to be stepped
726 again before re-inserting the breakpoint, do so. */
735 fprintf_unfiltered (gdb_stdlog,
736 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
737 paddr_nz (addr), siggnal, step);
739 /* In a multi-threaded task we may select another thread
740 and then continue or step.
742 But if the old thread was stopped at a breakpoint, it
743 will immediately cause another breakpoint stop without
744 any execution (i.e. it will report a breakpoint hit
745 incorrectly). So we must step over it first.
747 prepare_to_proceed checks the current thread against the thread
748 that reported the most recent event. If a step-over is required
749 it returns TRUE and sets the current thread to the old thread. */
750 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
754 /* We will get a trace trap after one instruction.
755 Continue it automatically and insert breakpoints then. */
759 insert_breakpoints ();
760 /* If we get here there was no call to error() in
761 insert breakpoints -- so they were inserted. */
762 breakpoints_inserted = 1;
765 if (siggnal != TARGET_SIGNAL_DEFAULT)
766 stop_signal = siggnal;
767 /* If this signal should not be seen by program,
768 give it zero. Used for debugging signals. */
769 else if (!signal_program[stop_signal])
770 stop_signal = TARGET_SIGNAL_0;
772 annotate_starting ();
774 /* Make sure that output from GDB appears before output from the
776 gdb_flush (gdb_stdout);
778 /* Refresh prev_pc value just prior to resuming. This used to be
779 done in stop_stepping, however, setting prev_pc there did not handle
780 scenarios such as inferior function calls or returning from
781 a function via the return command. In those cases, the prev_pc
782 value was not set properly for subsequent commands. The prev_pc value
783 is used to initialize the starting line number in the ecs. With an
784 invalid value, the gdb next command ends up stopping at the position
785 represented by the next line table entry past our start position.
786 On platforms that generate one line table entry per line, this
787 is not a problem. However, on the ia64, the compiler generates
788 extraneous line table entries that do not increase the line number.
789 When we issue the gdb next command on the ia64 after an inferior call
790 or a return command, we often end up a few instructions forward, still
791 within the original line we started.
793 An attempt was made to have init_execution_control_state () refresh
794 the prev_pc value before calculating the line number. This approach
795 did not work because on platforms that use ptrace, the pc register
796 cannot be read unless the inferior is stopped. At that point, we
797 are not guaranteed the inferior is stopped and so the read_pc ()
798 call can fail. Setting the prev_pc value here ensures the value is
799 updated correctly when the inferior is stopped. */
800 prev_pc = read_pc ();
802 /* Resume inferior. */
803 resume (oneproc || step || bpstat_should_step (), stop_signal);
805 /* Wait for it to stop (if not standalone)
806 and in any case decode why it stopped, and act accordingly. */
807 /* Do this only if we are not using the event loop, or if the target
808 does not support asynchronous execution. */
809 if (!target_can_async_p ())
811 wait_for_inferior ();
817 /* Start remote-debugging of a machine over a serial link. */
820 start_remote (int from_tty)
823 init_wait_for_inferior ();
824 stop_soon = STOP_QUIETLY;
827 /* Always go on waiting for the target, regardless of the mode. */
828 /* FIXME: cagney/1999-09-23: At present it isn't possible to
829 indicate to wait_for_inferior that a target should timeout if
830 nothing is returned (instead of just blocking). Because of this,
831 targets expecting an immediate response need to, internally, set
832 things up so that the target_wait() is forced to eventually
834 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
835 differentiate to its caller what the state of the target is after
836 the initial open has been performed. Here we're assuming that
837 the target has stopped. It should be possible to eventually have
838 target_open() return to the caller an indication that the target
839 is currently running and GDB state should be set to the same as
841 wait_for_inferior ();
843 /* Now that the inferior has stopped, do any bookkeeping like
844 loading shared libraries. We want to do this before normal_stop,
845 so that the displayed frame is up to date. */
846 post_create_inferior (¤t_target, from_tty);
851 /* Initialize static vars when a new inferior begins. */
854 init_wait_for_inferior (void)
856 /* These are meaningless until the first time through wait_for_inferior. */
859 breakpoints_inserted = 0;
860 breakpoint_init_inferior (inf_starting);
862 /* Don't confuse first call to proceed(). */
863 stop_signal = TARGET_SIGNAL_0;
865 /* The first resume is not following a fork/vfork/exec. */
866 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
868 clear_proceed_status ();
870 stepping_past_singlestep_breakpoint = 0;
873 /* This enum encodes possible reasons for doing a target_wait, so that
874 wfi can call target_wait in one place. (Ultimately the call will be
875 moved out of the infinite loop entirely.) */
879 infwait_normal_state,
880 infwait_thread_hop_state,
881 infwait_nonstep_watch_state
884 /* Why did the inferior stop? Used to print the appropriate messages
885 to the interface from within handle_inferior_event(). */
886 enum inferior_stop_reason
888 /* Step, next, nexti, stepi finished. */
890 /* Inferior terminated by signal. */
892 /* Inferior exited. */
894 /* Inferior received signal, and user asked to be notified. */
898 /* This structure contains what used to be local variables in
899 wait_for_inferior. Probably many of them can return to being
900 locals in handle_inferior_event. */
902 struct execution_control_state
904 struct target_waitstatus ws;
905 struct target_waitstatus *wp;
908 CORE_ADDR stop_func_start;
909 CORE_ADDR stop_func_end;
910 char *stop_func_name;
911 struct symtab_and_line sal;
913 struct symtab *current_symtab;
914 int handling_longjmp; /* FIXME */
916 ptid_t saved_inferior_ptid;
917 int step_after_step_resume_breakpoint;
918 int stepping_through_solib_after_catch;
919 bpstat stepping_through_solib_catchpoints;
920 int new_thread_event;
921 struct target_waitstatus tmpstatus;
922 enum infwait_states infwait_state;
927 void init_execution_control_state (struct execution_control_state *ecs);
929 void handle_inferior_event (struct execution_control_state *ecs);
931 static void step_into_function (struct execution_control_state *ecs);
932 static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame);
933 static void insert_step_resume_breakpoint_at_caller (struct frame_info *);
934 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
935 struct frame_id sr_id);
936 static void stop_stepping (struct execution_control_state *ecs);
937 static void prepare_to_wait (struct execution_control_state *ecs);
938 static void keep_going (struct execution_control_state *ecs);
939 static void print_stop_reason (enum inferior_stop_reason stop_reason,
942 /* Wait for control to return from inferior to debugger.
943 If inferior gets a signal, we may decide to start it up again
944 instead of returning. That is why there is a loop in this function.
945 When this function actually returns it means the inferior
946 should be left stopped and GDB should read more commands. */
949 wait_for_inferior (void)
951 struct cleanup *old_cleanups;
952 struct execution_control_state ecss;
953 struct execution_control_state *ecs;
956 fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n");
958 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
959 &step_resume_breakpoint);
961 /* wfi still stays in a loop, so it's OK just to take the address of
962 a local to get the ecs pointer. */
965 /* Fill in with reasonable starting values. */
966 init_execution_control_state (ecs);
968 /* We'll update this if & when we switch to a new thread. */
969 previous_inferior_ptid = inferior_ptid;
971 overlay_cache_invalid = 1;
973 /* We have to invalidate the registers BEFORE calling target_wait
974 because they can be loaded from the target while in target_wait.
975 This makes remote debugging a bit more efficient for those
976 targets that provide critical registers as part of their normal
979 registers_changed ();
983 if (deprecated_target_wait_hook)
984 ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
986 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
988 /* Now figure out what to do with the result of the result. */
989 handle_inferior_event (ecs);
991 if (!ecs->wait_some_more)
994 do_cleanups (old_cleanups);
997 /* Asynchronous version of wait_for_inferior. It is called by the
998 event loop whenever a change of state is detected on the file
999 descriptor corresponding to the target. It can be called more than
1000 once to complete a single execution command. In such cases we need
1001 to keep the state in a global variable ASYNC_ECSS. If it is the
1002 last time that this function is called for a single execution
1003 command, then report to the user that the inferior has stopped, and
1004 do the necessary cleanups. */
1006 struct execution_control_state async_ecss;
1007 struct execution_control_state *async_ecs;
1010 fetch_inferior_event (void *client_data)
1012 static struct cleanup *old_cleanups;
1014 async_ecs = &async_ecss;
1016 if (!async_ecs->wait_some_more)
1018 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1019 &step_resume_breakpoint);
1021 /* Fill in with reasonable starting values. */
1022 init_execution_control_state (async_ecs);
1024 /* We'll update this if & when we switch to a new thread. */
1025 previous_inferior_ptid = inferior_ptid;
1027 overlay_cache_invalid = 1;
1029 /* We have to invalidate the registers BEFORE calling target_wait
1030 because they can be loaded from the target while in target_wait.
1031 This makes remote debugging a bit more efficient for those
1032 targets that provide critical registers as part of their normal
1033 status mechanism. */
1035 registers_changed ();
1038 if (deprecated_target_wait_hook)
1040 deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1042 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1044 /* Now figure out what to do with the result of the result. */
1045 handle_inferior_event (async_ecs);
1047 if (!async_ecs->wait_some_more)
1049 /* Do only the cleanups that have been added by this
1050 function. Let the continuations for the commands do the rest,
1051 if there are any. */
1052 do_exec_cleanups (old_cleanups);
1054 if (step_multi && stop_step)
1055 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1057 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1061 /* Prepare an execution control state for looping through a
1062 wait_for_inferior-type loop. */
1065 init_execution_control_state (struct execution_control_state *ecs)
1067 ecs->another_trap = 0;
1068 ecs->random_signal = 0;
1069 ecs->step_after_step_resume_breakpoint = 0;
1070 ecs->handling_longjmp = 0; /* FIXME */
1071 ecs->stepping_through_solib_after_catch = 0;
1072 ecs->stepping_through_solib_catchpoints = NULL;
1073 ecs->sal = find_pc_line (prev_pc, 0);
1074 ecs->current_line = ecs->sal.line;
1075 ecs->current_symtab = ecs->sal.symtab;
1076 ecs->infwait_state = infwait_normal_state;
1077 ecs->waiton_ptid = pid_to_ptid (-1);
1078 ecs->wp = &(ecs->ws);
1081 /* Return the cached copy of the last pid/waitstatus returned by
1082 target_wait()/deprecated_target_wait_hook(). The data is actually
1083 cached by handle_inferior_event(), which gets called immediately
1084 after target_wait()/deprecated_target_wait_hook(). */
1087 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1089 *ptidp = target_last_wait_ptid;
1090 *status = target_last_waitstatus;
1094 nullify_last_target_wait_ptid (void)
1096 target_last_wait_ptid = minus_one_ptid;
1099 /* Switch thread contexts, maintaining "infrun state". */
1102 context_switch (struct execution_control_state *ecs)
1104 /* Caution: it may happen that the new thread (or the old one!)
1105 is not in the thread list. In this case we must not attempt
1106 to "switch context", or we run the risk that our context may
1107 be lost. This may happen as a result of the target module
1108 mishandling thread creation. */
1112 fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ",
1113 target_pid_to_str (inferior_ptid));
1114 fprintf_unfiltered (gdb_stdlog, "to %s\n",
1115 target_pid_to_str (ecs->ptid));
1118 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1119 { /* Perform infrun state context switch: */
1120 /* Save infrun state for the old thread. */
1121 save_infrun_state (inferior_ptid, prev_pc,
1122 trap_expected, step_resume_breakpoint,
1124 step_range_end, &step_frame_id,
1125 ecs->handling_longjmp, ecs->another_trap,
1126 ecs->stepping_through_solib_after_catch,
1127 ecs->stepping_through_solib_catchpoints,
1128 ecs->current_line, ecs->current_symtab);
1130 /* Load infrun state for the new thread. */
1131 load_infrun_state (ecs->ptid, &prev_pc,
1132 &trap_expected, &step_resume_breakpoint,
1134 &step_range_end, &step_frame_id,
1135 &ecs->handling_longjmp, &ecs->another_trap,
1136 &ecs->stepping_through_solib_after_catch,
1137 &ecs->stepping_through_solib_catchpoints,
1138 &ecs->current_line, &ecs->current_symtab);
1140 inferior_ptid = ecs->ptid;
1141 reinit_frame_cache ();
1145 adjust_pc_after_break (struct execution_control_state *ecs)
1147 CORE_ADDR breakpoint_pc;
1149 /* If this target does not decrement the PC after breakpoints, then
1150 we have nothing to do. */
1151 if (gdbarch_decr_pc_after_break (current_gdbarch) == 0)
1154 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1155 we aren't, just return.
1157 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1158 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1159 implemented by software breakpoints should be handled through the normal
1162 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1163 different signals (SIGILL or SIGEMT for instance), but it is less
1164 clear where the PC is pointing afterwards. It may not match
1165 gdbarch_decr_pc_after_break. I don't know any specific target that
1166 generates these signals at breakpoints (the code has been in GDB since at
1167 least 1992) so I can not guess how to handle them here.
1169 In earlier versions of GDB, a target with
1170 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
1171 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
1172 target with both of these set in GDB history, and it seems unlikely to be
1173 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
1175 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1178 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1181 /* Find the location where (if we've hit a breakpoint) the
1182 breakpoint would be. */
1183 breakpoint_pc = read_pc_pid (ecs->ptid) - gdbarch_decr_pc_after_break
1186 if (SOFTWARE_SINGLE_STEP_P ())
1188 /* When using software single-step, a SIGTRAP can only indicate
1189 an inserted breakpoint. This actually makes things
1191 if (singlestep_breakpoints_inserted_p)
1192 /* When software single stepping, the instruction at [prev_pc]
1193 is never a breakpoint, but the instruction following
1194 [prev_pc] (in program execution order) always is. Assume
1195 that following instruction was reached and hence a software
1196 breakpoint was hit. */
1197 write_pc_pid (breakpoint_pc, ecs->ptid);
1198 else if (software_breakpoint_inserted_here_p (breakpoint_pc))
1199 /* The inferior was free running (i.e., no single-step
1200 breakpoints inserted) and it hit a software breakpoint. */
1201 write_pc_pid (breakpoint_pc, ecs->ptid);
1205 /* When using hardware single-step, a SIGTRAP is reported for
1206 both a completed single-step and a software breakpoint. Need
1207 to differentiate between the two as the latter needs
1208 adjusting but the former does not.
1210 When the thread to be examined does not match the current thread
1211 context we can't use currently_stepping, so assume no
1212 single-stepping in this case. */
1213 if (ptid_equal (ecs->ptid, inferior_ptid) && currently_stepping (ecs))
1215 if (prev_pc == breakpoint_pc
1216 && software_breakpoint_inserted_here_p (breakpoint_pc))
1217 /* Hardware single-stepped a software breakpoint (as
1218 occures when the inferior is resumed with PC pointing
1219 at not-yet-hit software breakpoint). Since the
1220 breakpoint really is executed, the inferior needs to be
1221 backed up to the breakpoint address. */
1222 write_pc_pid (breakpoint_pc, ecs->ptid);
1226 if (software_breakpoint_inserted_here_p (breakpoint_pc))
1227 /* The inferior was free running (i.e., no hardware
1228 single-step and no possibility of a false SIGTRAP) and
1229 hit a software breakpoint. */
1230 write_pc_pid (breakpoint_pc, ecs->ptid);
1235 /* Given an execution control state that has been freshly filled in
1236 by an event from the inferior, figure out what it means and take
1237 appropriate action. */
1239 int stepped_after_stopped_by_watchpoint;
1242 handle_inferior_event (struct execution_control_state *ecs)
1244 /* NOTE: bje/2005-05-02: If you're looking at this code and thinking
1245 that the variable stepped_after_stopped_by_watchpoint isn't used,
1246 then you're wrong! See remote.c:remote_stopped_data_address. */
1248 int sw_single_step_trap_p = 0;
1249 int stopped_by_watchpoint = -1; /* Mark as unknown. */
1251 /* Cache the last pid/waitstatus. */
1252 target_last_wait_ptid = ecs->ptid;
1253 target_last_waitstatus = *ecs->wp;
1255 adjust_pc_after_break (ecs);
1257 switch (ecs->infwait_state)
1259 case infwait_thread_hop_state:
1261 fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n");
1262 /* Cancel the waiton_ptid. */
1263 ecs->waiton_ptid = pid_to_ptid (-1);
1266 case infwait_normal_state:
1268 fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n");
1269 stepped_after_stopped_by_watchpoint = 0;
1272 case infwait_nonstep_watch_state:
1274 fprintf_unfiltered (gdb_stdlog,
1275 "infrun: infwait_nonstep_watch_state\n");
1276 insert_breakpoints ();
1278 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1279 handle things like signals arriving and other things happening
1280 in combination correctly? */
1281 stepped_after_stopped_by_watchpoint = 1;
1285 internal_error (__FILE__, __LINE__, _("bad switch"));
1287 ecs->infwait_state = infwait_normal_state;
1289 reinit_frame_cache ();
1291 /* If it's a new process, add it to the thread database */
1293 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1294 && !ptid_equal (ecs->ptid, minus_one_ptid)
1295 && !in_thread_list (ecs->ptid));
1297 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1298 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1300 add_thread (ecs->ptid);
1302 ui_out_text (uiout, "[New ");
1303 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1304 ui_out_text (uiout, "]\n");
1307 switch (ecs->ws.kind)
1309 case TARGET_WAITKIND_LOADED:
1311 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n");
1312 /* Ignore gracefully during startup of the inferior, as it
1313 might be the shell which has just loaded some objects,
1314 otherwise add the symbols for the newly loaded objects. */
1316 if (stop_soon == NO_STOP_QUIETLY)
1318 /* Remove breakpoints, SOLIB_ADD might adjust
1319 breakpoint addresses via breakpoint_re_set. */
1320 if (breakpoints_inserted)
1321 remove_breakpoints ();
1323 /* Check for any newly added shared libraries if we're
1324 supposed to be adding them automatically. Switch
1325 terminal for any messages produced by
1326 breakpoint_re_set. */
1327 target_terminal_ours_for_output ();
1328 /* NOTE: cagney/2003-11-25: Make certain that the target
1329 stack's section table is kept up-to-date. Architectures,
1330 (e.g., PPC64), use the section table to perform
1331 operations such as address => section name and hence
1332 require the table to contain all sections (including
1333 those found in shared libraries). */
1334 /* NOTE: cagney/2003-11-25: Pass current_target and not
1335 exec_ops to SOLIB_ADD. This is because current GDB is
1336 only tooled to propagate section_table changes out from
1337 the "current_target" (see target_resize_to_sections), and
1338 not up from the exec stratum. This, of course, isn't
1339 right. "infrun.c" should only interact with the
1340 exec/process stratum, instead relying on the target stack
1341 to propagate relevant changes (stop, section table
1342 changed, ...) up to other layers. */
1343 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1344 target_terminal_inferior ();
1346 /* Reinsert breakpoints and continue. */
1347 if (breakpoints_inserted)
1348 insert_breakpoints ();
1351 resume (0, TARGET_SIGNAL_0);
1352 prepare_to_wait (ecs);
1355 case TARGET_WAITKIND_SPURIOUS:
1357 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1358 resume (0, TARGET_SIGNAL_0);
1359 prepare_to_wait (ecs);
1362 case TARGET_WAITKIND_EXITED:
1364 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n");
1365 target_terminal_ours (); /* Must do this before mourn anyway */
1366 print_stop_reason (EXITED, ecs->ws.value.integer);
1368 /* Record the exit code in the convenience variable $_exitcode, so
1369 that the user can inspect this again later. */
1370 set_internalvar (lookup_internalvar ("_exitcode"),
1371 value_from_longest (builtin_type_int,
1372 (LONGEST) ecs->ws.value.integer));
1373 gdb_flush (gdb_stdout);
1374 target_mourn_inferior ();
1375 singlestep_breakpoints_inserted_p = 0; /* SOFTWARE_SINGLE_STEP_P() */
1376 stop_print_frame = 0;
1377 stop_stepping (ecs);
1380 case TARGET_WAITKIND_SIGNALLED:
1382 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1383 stop_print_frame = 0;
1384 stop_signal = ecs->ws.value.sig;
1385 target_terminal_ours (); /* Must do this before mourn anyway */
1387 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1388 reach here unless the inferior is dead. However, for years
1389 target_kill() was called here, which hints that fatal signals aren't
1390 really fatal on some systems. If that's true, then some changes
1392 target_mourn_inferior ();
1394 print_stop_reason (SIGNAL_EXITED, stop_signal);
1395 singlestep_breakpoints_inserted_p = 0; /* SOFTWARE_SINGLE_STEP_P() */
1396 stop_stepping (ecs);
1399 /* The following are the only cases in which we keep going;
1400 the above cases end in a continue or goto. */
1401 case TARGET_WAITKIND_FORKED:
1402 case TARGET_WAITKIND_VFORKED:
1404 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n");
1405 stop_signal = TARGET_SIGNAL_TRAP;
1406 pending_follow.kind = ecs->ws.kind;
1408 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1409 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1411 if (!ptid_equal (ecs->ptid, inferior_ptid))
1413 context_switch (ecs);
1414 reinit_frame_cache ();
1417 stop_pc = read_pc ();
1419 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1421 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1423 /* If no catchpoint triggered for this, then keep going. */
1424 if (ecs->random_signal)
1426 stop_signal = TARGET_SIGNAL_0;
1430 goto process_event_stop_test;
1432 case TARGET_WAITKIND_EXECD:
1434 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n");
1435 stop_signal = TARGET_SIGNAL_TRAP;
1437 /* NOTE drow/2002-12-05: This code should be pushed down into the
1438 target_wait function. Until then following vfork on HP/UX 10.20
1439 is probably broken by this. Of course, it's broken anyway. */
1440 /* Is this a target which reports multiple exec events per actual
1441 call to exec()? (HP-UX using ptrace does, for example.) If so,
1442 ignore all but the last one. Just resume the exec'r, and wait
1443 for the next exec event. */
1444 if (inferior_ignoring_leading_exec_events)
1446 inferior_ignoring_leading_exec_events--;
1447 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1448 prepare_to_wait (ecs);
1451 inferior_ignoring_leading_exec_events =
1452 target_reported_exec_events_per_exec_call () - 1;
1454 pending_follow.execd_pathname =
1455 savestring (ecs->ws.value.execd_pathname,
1456 strlen (ecs->ws.value.execd_pathname));
1458 /* This causes the eventpoints and symbol table to be reset. Must
1459 do this now, before trying to determine whether to stop. */
1460 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1461 xfree (pending_follow.execd_pathname);
1463 stop_pc = read_pc_pid (ecs->ptid);
1464 ecs->saved_inferior_ptid = inferior_ptid;
1465 inferior_ptid = ecs->ptid;
1467 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1469 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1470 inferior_ptid = ecs->saved_inferior_ptid;
1472 if (!ptid_equal (ecs->ptid, inferior_ptid))
1474 context_switch (ecs);
1475 reinit_frame_cache ();
1478 /* If no catchpoint triggered for this, then keep going. */
1479 if (ecs->random_signal)
1481 stop_signal = TARGET_SIGNAL_0;
1485 goto process_event_stop_test;
1487 /* Be careful not to try to gather much state about a thread
1488 that's in a syscall. It's frequently a losing proposition. */
1489 case TARGET_WAITKIND_SYSCALL_ENTRY:
1491 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1492 resume (0, TARGET_SIGNAL_0);
1493 prepare_to_wait (ecs);
1496 /* Before examining the threads further, step this thread to
1497 get it entirely out of the syscall. (We get notice of the
1498 event when the thread is just on the verge of exiting a
1499 syscall. Stepping one instruction seems to get it back
1501 case TARGET_WAITKIND_SYSCALL_RETURN:
1503 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1504 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1505 prepare_to_wait (ecs);
1508 case TARGET_WAITKIND_STOPPED:
1510 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n");
1511 stop_signal = ecs->ws.value.sig;
1514 /* We had an event in the inferior, but we are not interested
1515 in handling it at this level. The lower layers have already
1516 done what needs to be done, if anything.
1518 One of the possible circumstances for this is when the
1519 inferior produces output for the console. The inferior has
1520 not stopped, and we are ignoring the event. Another possible
1521 circumstance is any event which the lower level knows will be
1522 reported multiple times without an intervening resume. */
1523 case TARGET_WAITKIND_IGNORE:
1525 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n");
1526 prepare_to_wait (ecs);
1530 /* We may want to consider not doing a resume here in order to give
1531 the user a chance to play with the new thread. It might be good
1532 to make that a user-settable option. */
1534 /* At this point, all threads are stopped (happens automatically in
1535 either the OS or the native code). Therefore we need to continue
1536 all threads in order to make progress. */
1537 if (ecs->new_thread_event)
1539 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1540 prepare_to_wait (ecs);
1544 stop_pc = read_pc_pid (ecs->ptid);
1547 fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc));
1549 if (stepping_past_singlestep_breakpoint)
1551 gdb_assert (SOFTWARE_SINGLE_STEP_P ()
1552 && singlestep_breakpoints_inserted_p);
1553 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1554 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1556 stepping_past_singlestep_breakpoint = 0;
1558 /* We've either finished single-stepping past the single-step
1559 breakpoint, or stopped for some other reason. It would be nice if
1560 we could tell, but we can't reliably. */
1561 if (stop_signal == TARGET_SIGNAL_TRAP)
1564 fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n");
1565 /* Pull the single step breakpoints out of the target. */
1566 remove_single_step_breakpoints ();
1567 singlestep_breakpoints_inserted_p = 0;
1569 ecs->random_signal = 0;
1571 ecs->ptid = saved_singlestep_ptid;
1572 context_switch (ecs);
1573 if (deprecated_context_hook)
1574 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1576 resume (1, TARGET_SIGNAL_0);
1577 prepare_to_wait (ecs);
1582 stepping_past_singlestep_breakpoint = 0;
1584 /* See if a thread hit a thread-specific breakpoint that was meant for
1585 another thread. If so, then step that thread past the breakpoint,
1588 if (stop_signal == TARGET_SIGNAL_TRAP)
1590 int thread_hop_needed = 0;
1592 /* Check if a regular breakpoint has been hit before checking
1593 for a potential single step breakpoint. Otherwise, GDB will
1594 not see this breakpoint hit when stepping onto breakpoints. */
1595 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1597 ecs->random_signal = 0;
1598 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1599 thread_hop_needed = 1;
1601 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1603 /* We have not context switched yet, so this should be true
1604 no matter which thread hit the singlestep breakpoint. */
1605 gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid));
1607 fprintf_unfiltered (gdb_stdlog, "infrun: software single step "
1609 target_pid_to_str (ecs->ptid));
1611 ecs->random_signal = 0;
1612 /* The call to in_thread_list is necessary because PTIDs sometimes
1613 change when we go from single-threaded to multi-threaded. If
1614 the singlestep_ptid is still in the list, assume that it is
1615 really different from ecs->ptid. */
1616 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1617 && in_thread_list (singlestep_ptid))
1619 /* If the PC of the thread we were trying to single-step
1620 has changed, discard this event (which we were going
1621 to ignore anyway), and pretend we saw that thread
1622 trap. This prevents us continuously moving the
1623 single-step breakpoint forward, one instruction at a
1624 time. If the PC has changed, then the thread we were
1625 trying to single-step has trapped or been signalled,
1626 but the event has not been reported to GDB yet.
1628 There might be some cases where this loses signal
1629 information, if a signal has arrived at exactly the
1630 same time that the PC changed, but this is the best
1631 we can do with the information available. Perhaps we
1632 should arrange to report all events for all threads
1633 when they stop, or to re-poll the remote looking for
1634 this particular thread (i.e. temporarily enable
1636 if (read_pc_pid (singlestep_ptid) != singlestep_pc)
1639 fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread,"
1640 " but expected thread advanced also\n");
1642 /* The current context still belongs to
1643 singlestep_ptid. Don't swap here, since that's
1644 the context we want to use. Just fudge our
1645 state and continue. */
1646 ecs->ptid = singlestep_ptid;
1647 stop_pc = read_pc_pid (ecs->ptid);
1652 fprintf_unfiltered (gdb_stdlog,
1653 "infrun: unexpected thread\n");
1655 thread_hop_needed = 1;
1656 stepping_past_singlestep_breakpoint = 1;
1657 saved_singlestep_ptid = singlestep_ptid;
1662 if (thread_hop_needed)
1667 fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n");
1669 /* Saw a breakpoint, but it was hit by the wrong thread.
1672 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1674 /* Pull the single step breakpoints out of the target. */
1675 remove_single_step_breakpoints ();
1676 singlestep_breakpoints_inserted_p = 0;
1679 remove_status = remove_breakpoints ();
1680 /* Did we fail to remove breakpoints? If so, try
1681 to set the PC past the bp. (There's at least
1682 one situation in which we can fail to remove
1683 the bp's: On HP-UX's that use ttrace, we can't
1684 change the address space of a vforking child
1685 process until the child exits (well, okay, not
1686 then either :-) or execs. */
1687 if (remove_status != 0)
1689 /* FIXME! This is obviously non-portable! */
1690 write_pc_pid (stop_pc + 4, ecs->ptid);
1691 /* We need to restart all the threads now,
1692 * unles we're running in scheduler-locked mode.
1693 * Use currently_stepping to determine whether to
1696 /* FIXME MVS: is there any reason not to call resume()? */
1697 if (scheduler_mode == schedlock_on)
1698 target_resume (ecs->ptid,
1699 currently_stepping (ecs), TARGET_SIGNAL_0);
1701 target_resume (RESUME_ALL,
1702 currently_stepping (ecs), TARGET_SIGNAL_0);
1703 prepare_to_wait (ecs);
1708 breakpoints_inserted = 0;
1709 if (!ptid_equal (inferior_ptid, ecs->ptid))
1710 context_switch (ecs);
1711 ecs->waiton_ptid = ecs->ptid;
1712 ecs->wp = &(ecs->ws);
1713 ecs->another_trap = 1;
1715 ecs->infwait_state = infwait_thread_hop_state;
1717 registers_changed ();
1721 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1723 sw_single_step_trap_p = 1;
1724 ecs->random_signal = 0;
1728 ecs->random_signal = 1;
1730 /* See if something interesting happened to the non-current thread. If
1731 so, then switch to that thread. */
1732 if (!ptid_equal (ecs->ptid, inferior_ptid))
1735 fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n");
1737 context_switch (ecs);
1739 if (deprecated_context_hook)
1740 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1743 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1745 /* Pull the single step breakpoints out of the target. */
1746 remove_single_step_breakpoints ();
1747 singlestep_breakpoints_inserted_p = 0;
1750 /* It may not be necessary to disable the watchpoint to stop over
1751 it. For example, the PA can (with some kernel cooperation)
1752 single step over a watchpoint without disabling the watchpoint. */
1753 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1756 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1758 prepare_to_wait (ecs);
1762 /* It is far more common to need to disable a watchpoint to step
1763 the inferior over it. FIXME. What else might a debug
1764 register or page protection watchpoint scheme need here? */
1765 if (gdbarch_have_nonsteppable_watchpoint (current_gdbarch)
1766 && STOPPED_BY_WATCHPOINT (ecs->ws))
1768 /* At this point, we are stopped at an instruction which has
1769 attempted to write to a piece of memory under control of
1770 a watchpoint. The instruction hasn't actually executed
1771 yet. If we were to evaluate the watchpoint expression
1772 now, we would get the old value, and therefore no change
1773 would seem to have occurred.
1775 In order to make watchpoints work `right', we really need
1776 to complete the memory write, and then evaluate the
1777 watchpoint expression. The following code does that by
1778 removing the watchpoint (actually, all watchpoints and
1779 breakpoints), single-stepping the target, re-inserting
1780 watchpoints, and then falling through to let normal
1781 single-step processing handle proceed. Since this
1782 includes evaluating watchpoints, things will come to a
1783 stop in the correct manner. */
1786 fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
1787 remove_breakpoints ();
1788 registers_changed ();
1789 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1791 ecs->waiton_ptid = ecs->ptid;
1792 ecs->wp = &(ecs->ws);
1793 ecs->infwait_state = infwait_nonstep_watch_state;
1794 prepare_to_wait (ecs);
1798 /* It may be possible to simply continue after a watchpoint. */
1799 if (HAVE_CONTINUABLE_WATCHPOINT)
1800 stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws);
1802 ecs->stop_func_start = 0;
1803 ecs->stop_func_end = 0;
1804 ecs->stop_func_name = 0;
1805 /* Don't care about return value; stop_func_start and stop_func_name
1806 will both be 0 if it doesn't work. */
1807 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1808 &ecs->stop_func_start, &ecs->stop_func_end);
1809 ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET;
1810 ecs->another_trap = 0;
1811 bpstat_clear (&stop_bpstat);
1813 stop_stack_dummy = 0;
1814 stop_print_frame = 1;
1815 ecs->random_signal = 0;
1816 stopped_by_random_signal = 0;
1818 if (stop_signal == TARGET_SIGNAL_TRAP
1820 && gdbarch_single_step_through_delay_p (current_gdbarch)
1821 && currently_stepping (ecs))
1823 /* We're trying to step of a breakpoint. Turns out that we're
1824 also on an instruction that needs to be stepped multiple
1825 times before it's been fully executing. E.g., architectures
1826 with a delay slot. It needs to be stepped twice, once for
1827 the instruction and once for the delay slot. */
1828 int step_through_delay
1829 = gdbarch_single_step_through_delay (current_gdbarch,
1830 get_current_frame ());
1831 if (debug_infrun && step_through_delay)
1832 fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n");
1833 if (step_range_end == 0 && step_through_delay)
1835 /* The user issued a continue when stopped at a breakpoint.
1836 Set up for another trap and get out of here. */
1837 ecs->another_trap = 1;
1841 else if (step_through_delay)
1843 /* The user issued a step when stopped at a breakpoint.
1844 Maybe we should stop, maybe we should not - the delay
1845 slot *might* correspond to a line of source. In any
1846 case, don't decide that here, just set ecs->another_trap,
1847 making sure we single-step again before breakpoints are
1849 ecs->another_trap = 1;
1853 /* Look at the cause of the stop, and decide what to do.
1854 The alternatives are:
1855 1) break; to really stop and return to the debugger,
1856 2) drop through to start up again
1857 (set ecs->another_trap to 1 to single step once)
1858 3) set ecs->random_signal to 1, and the decision between 1 and 2
1859 will be made according to the signal handling tables. */
1861 /* First, distinguish signals caused by the debugger from signals
1862 that have to do with the program's own actions. Note that
1863 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1864 on the operating system version. Here we detect when a SIGILL or
1865 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1866 something similar for SIGSEGV, since a SIGSEGV will be generated
1867 when we're trying to execute a breakpoint instruction on a
1868 non-executable stack. This happens for call dummy breakpoints
1869 for architectures like SPARC that place call dummies on the
1872 if (stop_signal == TARGET_SIGNAL_TRAP
1873 || (breakpoints_inserted
1874 && (stop_signal == TARGET_SIGNAL_ILL
1875 || stop_signal == TARGET_SIGNAL_SEGV
1876 || stop_signal == TARGET_SIGNAL_EMT))
1877 || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1879 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1882 fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n");
1883 stop_print_frame = 0;
1884 stop_stepping (ecs);
1888 /* This is originated from start_remote(), start_inferior() and
1889 shared libraries hook functions. */
1890 if (stop_soon == STOP_QUIETLY)
1893 fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
1894 stop_stepping (ecs);
1898 /* This originates from attach_command(). We need to overwrite
1899 the stop_signal here, because some kernels don't ignore a
1900 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1901 See more comments in inferior.h. */
1902 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1904 stop_stepping (ecs);
1905 if (stop_signal == TARGET_SIGNAL_STOP)
1906 stop_signal = TARGET_SIGNAL_0;
1910 /* Don't even think about breakpoints if just proceeded over a
1912 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1915 fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n");
1916 bpstat_clear (&stop_bpstat);
1920 /* See if there is a breakpoint at the current PC. */
1921 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid,
1922 stopped_by_watchpoint);
1924 /* Following in case break condition called a
1926 stop_print_frame = 1;
1929 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1930 at one stage in the past included checks for an inferior
1931 function call's call dummy's return breakpoint. The original
1932 comment, that went with the test, read:
1934 ``End of a stack dummy. Some systems (e.g. Sony news) give
1935 another signal besides SIGTRAP, so check here as well as
1938 If someone ever tries to get get call dummys on a
1939 non-executable stack to work (where the target would stop
1940 with something like a SIGSEGV), then those tests might need
1941 to be re-instated. Given, however, that the tests were only
1942 enabled when momentary breakpoints were not being used, I
1943 suspect that it won't be the case.
1945 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1946 be necessary for call dummies on a non-executable stack on
1949 if (stop_signal == TARGET_SIGNAL_TRAP)
1951 = !(bpstat_explains_signal (stop_bpstat)
1953 || (step_range_end && step_resume_breakpoint == NULL));
1956 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1957 if (!ecs->random_signal)
1958 stop_signal = TARGET_SIGNAL_TRAP;
1962 /* When we reach this point, we've pretty much decided
1963 that the reason for stopping must've been a random
1964 (unexpected) signal. */
1967 ecs->random_signal = 1;
1969 process_event_stop_test:
1970 /* For the program's own signals, act according to
1971 the signal handling tables. */
1973 if (ecs->random_signal)
1975 /* Signal not for debugging purposes. */
1979 fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal);
1981 stopped_by_random_signal = 1;
1983 if (signal_print[stop_signal])
1986 target_terminal_ours_for_output ();
1987 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
1989 if (signal_stop[stop_signal])
1991 stop_stepping (ecs);
1994 /* If not going to stop, give terminal back
1995 if we took it away. */
1997 target_terminal_inferior ();
1999 /* Clear the signal if it should not be passed. */
2000 if (signal_program[stop_signal] == 0)
2001 stop_signal = TARGET_SIGNAL_0;
2003 if (prev_pc == read_pc ()
2004 && !breakpoints_inserted
2005 && breakpoint_here_p (read_pc ())
2006 && step_resume_breakpoint == NULL)
2008 /* We were just starting a new sequence, attempting to
2009 single-step off of a breakpoint and expecting a SIGTRAP.
2010 Intead this signal arrives. This signal will take us out
2011 of the stepping range so GDB needs to remember to, when
2012 the signal handler returns, resume stepping off that
2014 /* To simplify things, "continue" is forced to use the same
2015 code paths as single-step - set a breakpoint at the
2016 signal return address and then, once hit, step off that
2019 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2020 ecs->step_after_step_resume_breakpoint = 1;
2025 if (step_range_end != 0
2026 && stop_signal != TARGET_SIGNAL_0
2027 && stop_pc >= step_range_start && stop_pc < step_range_end
2028 && frame_id_eq (get_frame_id (get_current_frame ()),
2030 && step_resume_breakpoint == NULL)
2032 /* The inferior is about to take a signal that will take it
2033 out of the single step range. Set a breakpoint at the
2034 current PC (which is presumably where the signal handler
2035 will eventually return) and then allow the inferior to
2038 Note that this is only needed for a signal delivered
2039 while in the single-step range. Nested signals aren't a
2040 problem as they eventually all return. */
2041 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2046 /* Note: step_resume_breakpoint may be non-NULL. This occures
2047 when either there's a nested signal, or when there's a
2048 pending signal enabled just as the signal handler returns
2049 (leaving the inferior at the step-resume-breakpoint without
2050 actually executing it). Either way continue until the
2051 breakpoint is really hit. */
2056 /* Handle cases caused by hitting a breakpoint. */
2058 CORE_ADDR jmp_buf_pc;
2059 struct bpstat_what what;
2061 what = bpstat_what (stop_bpstat);
2063 if (what.call_dummy)
2065 stop_stack_dummy = 1;
2068 switch (what.main_action)
2070 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2071 /* If we hit the breakpoint at longjmp, disable it for the
2072 duration of this command. Then, install a temporary
2073 breakpoint at the target of the jmp_buf. */
2075 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2076 disable_longjmp_breakpoint ();
2077 remove_breakpoints ();
2078 breakpoints_inserted = 0;
2079 if (!gdbarch_get_longjmp_target_p (current_gdbarch)
2080 || !gdbarch_get_longjmp_target (current_gdbarch, &jmp_buf_pc))
2086 /* Need to blow away step-resume breakpoint, as it
2087 interferes with us */
2088 if (step_resume_breakpoint != NULL)
2090 delete_step_resume_breakpoint (&step_resume_breakpoint);
2093 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2094 ecs->handling_longjmp = 1; /* FIXME */
2098 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2099 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2101 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2102 remove_breakpoints ();
2103 breakpoints_inserted = 0;
2104 disable_longjmp_breakpoint ();
2105 ecs->handling_longjmp = 0; /* FIXME */
2106 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2108 /* else fallthrough */
2110 case BPSTAT_WHAT_SINGLE:
2112 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n");
2113 if (breakpoints_inserted)
2114 remove_breakpoints ();
2115 breakpoints_inserted = 0;
2116 ecs->another_trap = 1;
2117 /* Still need to check other stuff, at least the case
2118 where we are stepping and step out of the right range. */
2121 case BPSTAT_WHAT_STOP_NOISY:
2123 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2124 stop_print_frame = 1;
2126 /* We are about to nuke the step_resume_breakpointt via the
2127 cleanup chain, so no need to worry about it here. */
2129 stop_stepping (ecs);
2132 case BPSTAT_WHAT_STOP_SILENT:
2134 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2135 stop_print_frame = 0;
2137 /* We are about to nuke the step_resume_breakpoin via the
2138 cleanup chain, so no need to worry about it here. */
2140 stop_stepping (ecs);
2143 case BPSTAT_WHAT_STEP_RESUME:
2144 /* This proably demands a more elegant solution, but, yeah
2147 This function's use of the simple variable
2148 step_resume_breakpoint doesn't seem to accomodate
2149 simultaneously active step-resume bp's, although the
2150 breakpoint list certainly can.
2152 If we reach here and step_resume_breakpoint is already
2153 NULL, then apparently we have multiple active
2154 step-resume bp's. We'll just delete the breakpoint we
2155 stopped at, and carry on.
2157 Correction: what the code currently does is delete a
2158 step-resume bp, but it makes no effort to ensure that
2159 the one deleted is the one currently stopped at. MVS */
2162 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2164 if (step_resume_breakpoint == NULL)
2166 step_resume_breakpoint =
2167 bpstat_find_step_resume_breakpoint (stop_bpstat);
2169 delete_step_resume_breakpoint (&step_resume_breakpoint);
2170 if (ecs->step_after_step_resume_breakpoint)
2172 /* Back when the step-resume breakpoint was inserted, we
2173 were trying to single-step off a breakpoint. Go back
2175 ecs->step_after_step_resume_breakpoint = 0;
2176 remove_breakpoints ();
2177 breakpoints_inserted = 0;
2178 ecs->another_trap = 1;
2184 case BPSTAT_WHAT_CHECK_SHLIBS:
2185 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2188 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2189 /* Remove breakpoints, we eventually want to step over the
2190 shlib event breakpoint, and SOLIB_ADD might adjust
2191 breakpoint addresses via breakpoint_re_set. */
2192 if (breakpoints_inserted)
2193 remove_breakpoints ();
2194 breakpoints_inserted = 0;
2196 /* Check for any newly added shared libraries if we're
2197 supposed to be adding them automatically. Switch
2198 terminal for any messages produced by
2199 breakpoint_re_set. */
2200 target_terminal_ours_for_output ();
2201 /* NOTE: cagney/2003-11-25: Make certain that the target
2202 stack's section table is kept up-to-date. Architectures,
2203 (e.g., PPC64), use the section table to perform
2204 operations such as address => section name and hence
2205 require the table to contain all sections (including
2206 those found in shared libraries). */
2207 /* NOTE: cagney/2003-11-25: Pass current_target and not
2208 exec_ops to SOLIB_ADD. This is because current GDB is
2209 only tooled to propagate section_table changes out from
2210 the "current_target" (see target_resize_to_sections), and
2211 not up from the exec stratum. This, of course, isn't
2212 right. "infrun.c" should only interact with the
2213 exec/process stratum, instead relying on the target stack
2214 to propagate relevant changes (stop, section table
2215 changed, ...) up to other layers. */
2217 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2219 solib_add (NULL, 0, ¤t_target, auto_solib_add);
2221 target_terminal_inferior ();
2223 /* Try to reenable shared library breakpoints, additional
2224 code segments in shared libraries might be mapped in now. */
2225 re_enable_breakpoints_in_shlibs ();
2227 /* If requested, stop when the dynamic linker notifies
2228 gdb of events. This allows the user to get control
2229 and place breakpoints in initializer routines for
2230 dynamically loaded objects (among other things). */
2231 if (stop_on_solib_events || stop_stack_dummy)
2233 stop_stepping (ecs);
2237 /* If we stopped due to an explicit catchpoint, then the
2238 (see above) call to SOLIB_ADD pulled in any symbols
2239 from a newly-loaded library, if appropriate.
2241 We do want the inferior to stop, but not where it is
2242 now, which is in the dynamic linker callback. Rather,
2243 we would like it stop in the user's program, just after
2244 the call that caused this catchpoint to trigger. That
2245 gives the user a more useful vantage from which to
2246 examine their program's state. */
2247 else if (what.main_action
2248 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2250 /* ??rehrauer: If I could figure out how to get the
2251 right return PC from here, we could just set a temp
2252 breakpoint and resume. I'm not sure we can without
2253 cracking open the dld's shared libraries and sniffing
2254 their unwind tables and text/data ranges, and that's
2255 not a terribly portable notion.
2257 Until that time, we must step the inferior out of the
2258 dld callback, and also out of the dld itself (and any
2259 code or stubs in libdld.sl, such as "shl_load" and
2260 friends) until we reach non-dld code. At that point,
2261 we can stop stepping. */
2262 bpstat_get_triggered_catchpoints (stop_bpstat,
2264 stepping_through_solib_catchpoints);
2265 ecs->stepping_through_solib_after_catch = 1;
2267 /* Be sure to lift all breakpoints, so the inferior does
2268 actually step past this point... */
2269 ecs->another_trap = 1;
2274 /* We want to step over this breakpoint, then keep going. */
2275 ecs->another_trap = 1;
2281 case BPSTAT_WHAT_LAST:
2282 /* Not a real code, but listed here to shut up gcc -Wall. */
2284 case BPSTAT_WHAT_KEEP_CHECKING:
2289 /* We come here if we hit a breakpoint but should not
2290 stop for it. Possibly we also were stepping
2291 and should stop for that. So fall through and
2292 test for stepping. But, if not stepping,
2295 /* Are we stepping to get the inferior out of the dynamic linker's
2296 hook (and possibly the dld itself) after catching a shlib
2298 if (ecs->stepping_through_solib_after_catch)
2300 #if defined(SOLIB_ADD)
2301 /* Have we reached our destination? If not, keep going. */
2302 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2305 fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n");
2306 ecs->another_trap = 1;
2312 fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n");
2313 /* Else, stop and report the catchpoint(s) whose triggering
2314 caused us to begin stepping. */
2315 ecs->stepping_through_solib_after_catch = 0;
2316 bpstat_clear (&stop_bpstat);
2317 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2318 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2319 stop_print_frame = 1;
2320 stop_stepping (ecs);
2324 if (step_resume_breakpoint)
2327 fprintf_unfiltered (gdb_stdlog,
2328 "infrun: step-resume breakpoint is inserted\n");
2330 /* Having a step-resume breakpoint overrides anything
2331 else having to do with stepping commands until
2332 that breakpoint is reached. */
2337 if (step_range_end == 0)
2340 fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n");
2341 /* Likewise if we aren't even stepping. */
2346 /* If stepping through a line, keep going if still within it.
2348 Note that step_range_end is the address of the first instruction
2349 beyond the step range, and NOT the address of the last instruction
2351 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2354 fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n",
2355 paddr_nz (step_range_start),
2356 paddr_nz (step_range_end));
2361 /* We stepped out of the stepping range. */
2363 /* If we are stepping at the source level and entered the runtime
2364 loader dynamic symbol resolution code, we keep on single stepping
2365 until we exit the run time loader code and reach the callee's
2367 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2368 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2369 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)
2371 && in_solib_dynsym_resolve_code (stop_pc)
2375 CORE_ADDR pc_after_resolver =
2376 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2379 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n");
2381 if (pc_after_resolver)
2383 /* Set up a step-resume breakpoint at the address
2384 indicated by SKIP_SOLIB_RESOLVER. */
2385 struct symtab_and_line sr_sal;
2387 sr_sal.pc = pc_after_resolver;
2389 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2396 if (step_range_end != 1
2397 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2398 || step_over_calls == STEP_OVER_ALL)
2399 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2402 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n");
2403 /* The inferior, while doing a "step" or "next", has ended up in
2404 a signal trampoline (either by a signal being delivered or by
2405 the signal handler returning). Just single-step until the
2406 inferior leaves the trampoline (either by calling the handler
2412 /* Check for subroutine calls. The check for the current frame
2413 equalling the step ID is not necessary - the check of the
2414 previous frame's ID is sufficient - but it is a common case and
2415 cheaper than checking the previous frame's ID.
2417 NOTE: frame_id_eq will never report two invalid frame IDs as
2418 being equal, so to get into this block, both the current and
2419 previous frame must have valid frame IDs. */
2420 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id)
2421 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id))
2423 CORE_ADDR real_stop_pc;
2426 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n");
2428 if ((step_over_calls == STEP_OVER_NONE)
2429 || ((step_range_end == 1)
2430 && in_prologue (prev_pc, ecs->stop_func_start)))
2432 /* I presume that step_over_calls is only 0 when we're
2433 supposed to be stepping at the assembly language level
2434 ("stepi"). Just stop. */
2435 /* Also, maybe we just did a "nexti" inside a prolog, so we
2436 thought it was a subroutine call but it was not. Stop as
2439 print_stop_reason (END_STEPPING_RANGE, 0);
2440 stop_stepping (ecs);
2444 if (step_over_calls == STEP_OVER_ALL)
2446 /* We're doing a "next", set a breakpoint at callee's return
2447 address (the address at which the caller will
2449 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2454 /* If we are in a function call trampoline (a stub between the
2455 calling routine and the real function), locate the real
2456 function. That's what tells us (a) whether we want to step
2457 into it at all, and (b) what prologue we want to run to the
2458 end of, if we do step into it. */
2459 real_stop_pc = skip_language_trampoline (stop_pc);
2460 if (real_stop_pc == 0)
2461 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2462 if (real_stop_pc != 0)
2463 ecs->stop_func_start = real_stop_pc;
2466 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2467 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)
2469 in_solib_dynsym_resolve_code (ecs->stop_func_start)
2473 struct symtab_and_line sr_sal;
2475 sr_sal.pc = ecs->stop_func_start;
2477 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2482 /* If we have line number information for the function we are
2483 thinking of stepping into, step into it.
2485 If there are several symtabs at that PC (e.g. with include
2486 files), just want to know whether *any* of them have line
2487 numbers. find_pc_line handles this. */
2489 struct symtab_and_line tmp_sal;
2491 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2492 if (tmp_sal.line != 0)
2494 step_into_function (ecs);
2499 /* If we have no line number and the step-stop-if-no-debug is
2500 set, we stop the step so that the user has a chance to switch
2501 in assembly mode. */
2502 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2505 print_stop_reason (END_STEPPING_RANGE, 0);
2506 stop_stepping (ecs);
2510 /* Set a breakpoint at callee's return address (the address at
2511 which the caller will resume). */
2512 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2517 /* If we're in the return path from a shared library trampoline,
2518 we want to proceed through the trampoline when stepping. */
2519 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2521 /* Determine where this trampoline returns. */
2522 CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2525 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n");
2527 /* Only proceed through if we know where it's going. */
2530 /* And put the step-breakpoint there and go until there. */
2531 struct symtab_and_line sr_sal;
2533 init_sal (&sr_sal); /* initialize to zeroes */
2534 sr_sal.pc = real_stop_pc;
2535 sr_sal.section = find_pc_overlay (sr_sal.pc);
2537 /* Do not specify what the fp should be when we stop since
2538 on some machines the prologue is where the new fp value
2540 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2542 /* Restart without fiddling with the step ranges or
2549 ecs->sal = find_pc_line (stop_pc, 0);
2551 /* NOTE: tausq/2004-05-24: This if block used to be done before all
2552 the trampoline processing logic, however, there are some trampolines
2553 that have no names, so we should do trampoline handling first. */
2554 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2555 && ecs->stop_func_name == NULL
2556 && ecs->sal.line == 0)
2559 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n");
2561 /* The inferior just stepped into, or returned to, an
2562 undebuggable function (where there is no debugging information
2563 and no line number corresponding to the address where the
2564 inferior stopped). Since we want to skip this kind of code,
2565 we keep going until the inferior returns from this
2566 function - unless the user has asked us not to (via
2567 set step-mode) or we no longer know how to get back
2568 to the call site. */
2569 if (step_stop_if_no_debug
2570 || !frame_id_p (frame_unwind_id (get_current_frame ())))
2572 /* If we have no line number and the step-stop-if-no-debug
2573 is set, we stop the step so that the user has a chance to
2574 switch in assembly mode. */
2576 print_stop_reason (END_STEPPING_RANGE, 0);
2577 stop_stepping (ecs);
2582 /* Set a breakpoint at callee's return address (the address
2583 at which the caller will resume). */
2584 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2590 if (step_range_end == 1)
2592 /* It is stepi or nexti. We always want to stop stepping after
2595 fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n");
2597 print_stop_reason (END_STEPPING_RANGE, 0);
2598 stop_stepping (ecs);
2602 if (ecs->sal.line == 0)
2604 /* We have no line number information. That means to stop
2605 stepping (does this always happen right after one instruction,
2606 when we do "s" in a function with no line numbers,
2607 or can this happen as a result of a return or longjmp?). */
2609 fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n");
2611 print_stop_reason (END_STEPPING_RANGE, 0);
2612 stop_stepping (ecs);
2616 if ((stop_pc == ecs->sal.pc)
2617 && (ecs->current_line != ecs->sal.line
2618 || ecs->current_symtab != ecs->sal.symtab))
2620 /* We are at the start of a different line. So stop. Note that
2621 we don't stop if we step into the middle of a different line.
2622 That is said to make things like for (;;) statements work
2625 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n");
2627 print_stop_reason (END_STEPPING_RANGE, 0);
2628 stop_stepping (ecs);
2632 /* We aren't done stepping.
2634 Optimize by setting the stepping range to the line.
2635 (We might not be in the original line, but if we entered a
2636 new line in mid-statement, we continue stepping. This makes
2637 things like for(;;) statements work better.) */
2639 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2641 /* If this is the last line of the function, don't keep stepping
2642 (it would probably step us out of the function).
2643 This is particularly necessary for a one-line function,
2644 in which after skipping the prologue we better stop even though
2645 we will be in mid-line. */
2647 fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n");
2649 print_stop_reason (END_STEPPING_RANGE, 0);
2650 stop_stepping (ecs);
2653 step_range_start = ecs->sal.pc;
2654 step_range_end = ecs->sal.end;
2655 step_frame_id = get_frame_id (get_current_frame ());
2656 ecs->current_line = ecs->sal.line;
2657 ecs->current_symtab = ecs->sal.symtab;
2659 /* In the case where we just stepped out of a function into the
2660 middle of a line of the caller, continue stepping, but
2661 step_frame_id must be modified to current frame */
2663 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2664 generous. It will trigger on things like a step into a frameless
2665 stackless leaf function. I think the logic should instead look
2666 at the unwound frame ID has that should give a more robust
2667 indication of what happened. */
2668 if (step - ID == current - ID)
2669 still stepping in same function;
2670 else if (step - ID == unwind (current - ID))
2671 stepped into a function;
2673 stepped out of a function;
2674 /* Of course this assumes that the frame ID unwind code is robust
2675 and we're willing to introduce frame unwind logic into this
2676 function. Fortunately, those days are nearly upon us. */
2679 struct frame_id current_frame = get_frame_id (get_current_frame ());
2680 if (!(frame_id_inner (current_frame, step_frame_id)))
2681 step_frame_id = current_frame;
2685 fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n");
2689 /* Are we in the middle of stepping? */
2692 currently_stepping (struct execution_control_state *ecs)
2694 return ((!ecs->handling_longjmp
2695 && ((step_range_end && step_resume_breakpoint == NULL)
2697 || ecs->stepping_through_solib_after_catch
2698 || bpstat_should_step ());
2701 /* Subroutine call with source code we should not step over. Do step
2702 to the first line of code in it. */
2705 step_into_function (struct execution_control_state *ecs)
2708 struct symtab_and_line sr_sal;
2710 s = find_pc_symtab (stop_pc);
2711 if (s && s->language != language_asm)
2712 ecs->stop_func_start = gdbarch_skip_prologue
2713 (current_gdbarch, ecs->stop_func_start);
2715 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2716 /* Use the step_resume_break to step until the end of the prologue,
2717 even if that involves jumps (as it seems to on the vax under
2719 /* If the prologue ends in the middle of a source line, continue to
2720 the end of that source line (if it is still within the function).
2721 Otherwise, just go to end of prologue. */
2723 && ecs->sal.pc != ecs->stop_func_start
2724 && ecs->sal.end < ecs->stop_func_end)
2725 ecs->stop_func_start = ecs->sal.end;
2727 /* Architectures which require breakpoint adjustment might not be able
2728 to place a breakpoint at the computed address. If so, the test
2729 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2730 ecs->stop_func_start to an address at which a breakpoint may be
2731 legitimately placed.
2733 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2734 made, GDB will enter an infinite loop when stepping through
2735 optimized code consisting of VLIW instructions which contain
2736 subinstructions corresponding to different source lines. On
2737 FR-V, it's not permitted to place a breakpoint on any but the
2738 first subinstruction of a VLIW instruction. When a breakpoint is
2739 set, GDB will adjust the breakpoint address to the beginning of
2740 the VLIW instruction. Thus, we need to make the corresponding
2741 adjustment here when computing the stop address. */
2743 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2745 ecs->stop_func_start
2746 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2747 ecs->stop_func_start);
2750 if (ecs->stop_func_start == stop_pc)
2752 /* We are already there: stop now. */
2754 print_stop_reason (END_STEPPING_RANGE, 0);
2755 stop_stepping (ecs);
2760 /* Put the step-breakpoint there and go until there. */
2761 init_sal (&sr_sal); /* initialize to zeroes */
2762 sr_sal.pc = ecs->stop_func_start;
2763 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2765 /* Do not specify what the fp should be when we stop since on
2766 some machines the prologue is where the new fp value is
2768 insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id);
2770 /* And make sure stepping stops right away then. */
2771 step_range_end = step_range_start;
2776 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
2777 This is used to both functions and to skip over code. */
2780 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
2781 struct frame_id sr_id)
2783 /* There should never be more than one step-resume breakpoint per
2784 thread, so we should never be setting a new
2785 step_resume_breakpoint when one is already active. */
2786 gdb_assert (step_resume_breakpoint == NULL);
2789 fprintf_unfiltered (gdb_stdlog,
2790 "infrun: inserting step-resume breakpoint at 0x%s\n",
2791 paddr_nz (sr_sal.pc));
2793 step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id,
2795 if (breakpoints_inserted)
2796 insert_breakpoints ();
2799 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
2800 to skip a potential signal handler.
2802 This is called with the interrupted function's frame. The signal
2803 handler, when it returns, will resume the interrupted function at
2807 insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame)
2809 struct symtab_and_line sr_sal;
2811 init_sal (&sr_sal); /* initialize to zeros */
2813 sr_sal.pc = gdbarch_addr_bits_remove
2814 (current_gdbarch, get_frame_pc (return_frame));
2815 sr_sal.section = find_pc_overlay (sr_sal.pc);
2817 insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame));
2820 /* Similar to insert_step_resume_breakpoint_at_frame, except
2821 but a breakpoint at the previous frame's PC. This is used to
2822 skip a function after stepping into it (for "next" or if the called
2823 function has no debugging information).
2825 The current function has almost always been reached by single
2826 stepping a call or return instruction. NEXT_FRAME belongs to the
2827 current function, and the breakpoint will be set at the caller's
2830 This is a separate function rather than reusing
2831 insert_step_resume_breakpoint_at_frame in order to avoid
2832 get_prev_frame, which may stop prematurely (see the implementation
2833 of frame_unwind_id for an example). */
2836 insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame)
2838 struct symtab_and_line sr_sal;
2840 /* We shouldn't have gotten here if we don't know where the call site
2842 gdb_assert (frame_id_p (frame_unwind_id (next_frame)));
2844 init_sal (&sr_sal); /* initialize to zeros */
2846 sr_sal.pc = gdbarch_addr_bits_remove
2847 (current_gdbarch, frame_pc_unwind (next_frame));
2848 sr_sal.section = find_pc_overlay (sr_sal.pc);
2850 insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame));
2854 stop_stepping (struct execution_control_state *ecs)
2857 fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n");
2859 /* Let callers know we don't want to wait for the inferior anymore. */
2860 ecs->wait_some_more = 0;
2863 /* This function handles various cases where we need to continue
2864 waiting for the inferior. */
2865 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2868 keep_going (struct execution_control_state *ecs)
2870 /* Save the pc before execution, to compare with pc after stop. */
2871 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2873 /* If we did not do break;, it means we should keep running the
2874 inferior and not return to debugger. */
2876 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2878 /* We took a signal (which we are supposed to pass through to
2879 the inferior, else we'd have done a break above) and we
2880 haven't yet gotten our trap. Simply continue. */
2881 resume (currently_stepping (ecs), stop_signal);
2885 /* Either the trap was not expected, but we are continuing
2886 anyway (the user asked that this signal be passed to the
2889 The signal was SIGTRAP, e.g. it was our signal, but we
2890 decided we should resume from it.
2892 We're going to run this baby now! */
2894 if (!breakpoints_inserted && !ecs->another_trap)
2896 /* Stop stepping when inserting breakpoints
2898 if (insert_breakpoints () != 0)
2900 stop_stepping (ecs);
2903 breakpoints_inserted = 1;
2906 trap_expected = ecs->another_trap;
2908 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2909 specifies that such a signal should be delivered to the
2912 Typically, this would occure when a user is debugging a
2913 target monitor on a simulator: the target monitor sets a
2914 breakpoint; the simulator encounters this break-point and
2915 halts the simulation handing control to GDB; GDB, noteing
2916 that the break-point isn't valid, returns control back to the
2917 simulator; the simulator then delivers the hardware
2918 equivalent of a SIGNAL_TRAP to the program being debugged. */
2920 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2921 stop_signal = TARGET_SIGNAL_0;
2924 resume (currently_stepping (ecs), stop_signal);
2927 prepare_to_wait (ecs);
2930 /* This function normally comes after a resume, before
2931 handle_inferior_event exits. It takes care of any last bits of
2932 housekeeping, and sets the all-important wait_some_more flag. */
2935 prepare_to_wait (struct execution_control_state *ecs)
2938 fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
2939 if (ecs->infwait_state == infwait_normal_state)
2941 overlay_cache_invalid = 1;
2943 /* We have to invalidate the registers BEFORE calling
2944 target_wait because they can be loaded from the target while
2945 in target_wait. This makes remote debugging a bit more
2946 efficient for those targets that provide critical registers
2947 as part of their normal status mechanism. */
2949 registers_changed ();
2950 ecs->waiton_ptid = pid_to_ptid (-1);
2951 ecs->wp = &(ecs->ws);
2953 /* This is the old end of the while loop. Let everybody know we
2954 want to wait for the inferior some more and get called again
2956 ecs->wait_some_more = 1;
2959 /* Print why the inferior has stopped. We always print something when
2960 the inferior exits, or receives a signal. The rest of the cases are
2961 dealt with later on in normal_stop() and print_it_typical(). Ideally
2962 there should be a call to this function from handle_inferior_event()
2963 each time stop_stepping() is called.*/
2965 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2967 switch (stop_reason)
2969 case END_STEPPING_RANGE:
2970 /* We are done with a step/next/si/ni command. */
2971 /* For now print nothing. */
2972 /* Print a message only if not in the middle of doing a "step n"
2973 operation for n > 1 */
2974 if (!step_multi || !stop_step)
2975 if (ui_out_is_mi_like_p (uiout))
2978 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE));
2981 /* The inferior was terminated by a signal. */
2982 annotate_signalled ();
2983 if (ui_out_is_mi_like_p (uiout))
2986 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED));
2987 ui_out_text (uiout, "\nProgram terminated with signal ");
2988 annotate_signal_name ();
2989 ui_out_field_string (uiout, "signal-name",
2990 target_signal_to_name (stop_info));
2991 annotate_signal_name_end ();
2992 ui_out_text (uiout, ", ");
2993 annotate_signal_string ();
2994 ui_out_field_string (uiout, "signal-meaning",
2995 target_signal_to_string (stop_info));
2996 annotate_signal_string_end ();
2997 ui_out_text (uiout, ".\n");
2998 ui_out_text (uiout, "The program no longer exists.\n");
3001 /* The inferior program is finished. */
3002 annotate_exited (stop_info);
3005 if (ui_out_is_mi_like_p (uiout))
3006 ui_out_field_string (uiout, "reason",
3007 async_reason_lookup (EXEC_ASYNC_EXITED));
3008 ui_out_text (uiout, "\nProgram exited with code ");
3009 ui_out_field_fmt (uiout, "exit-code", "0%o",
3010 (unsigned int) stop_info);
3011 ui_out_text (uiout, ".\n");
3015 if (ui_out_is_mi_like_p (uiout))
3018 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY));
3019 ui_out_text (uiout, "\nProgram exited normally.\n");
3021 /* Support the --return-child-result option. */
3022 return_child_result_value = stop_info;
3024 case SIGNAL_RECEIVED:
3025 /* Signal received. The signal table tells us to print about
3028 ui_out_text (uiout, "\nProgram received signal ");
3029 annotate_signal_name ();
3030 if (ui_out_is_mi_like_p (uiout))
3032 (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED));
3033 ui_out_field_string (uiout, "signal-name",
3034 target_signal_to_name (stop_info));
3035 annotate_signal_name_end ();
3036 ui_out_text (uiout, ", ");
3037 annotate_signal_string ();
3038 ui_out_field_string (uiout, "signal-meaning",
3039 target_signal_to_string (stop_info));
3040 annotate_signal_string_end ();
3041 ui_out_text (uiout, ".\n");
3044 internal_error (__FILE__, __LINE__,
3045 _("print_stop_reason: unrecognized enum value"));
3051 /* Here to return control to GDB when the inferior stops for real.
3052 Print appropriate messages, remove breakpoints, give terminal our modes.
3054 STOP_PRINT_FRAME nonzero means print the executing frame
3055 (pc, function, args, file, line number and line text).
3056 BREAKPOINTS_FAILED nonzero means stop was due to error
3057 attempting to insert breakpoints. */
3062 struct target_waitstatus last;
3065 get_last_target_status (&last_ptid, &last);
3067 /* As with the notification of thread events, we want to delay
3068 notifying the user that we've switched thread context until
3069 the inferior actually stops.
3071 There's no point in saying anything if the inferior has exited.
3072 Note that SIGNALLED here means "exited with a signal", not
3073 "received a signal". */
3074 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
3075 && target_has_execution
3076 && last.kind != TARGET_WAITKIND_SIGNALLED
3077 && last.kind != TARGET_WAITKIND_EXITED)
3079 target_terminal_ours_for_output ();
3080 printf_filtered (_("[Switching to %s]\n"),
3081 target_pid_or_tid_to_str (inferior_ptid));
3082 previous_inferior_ptid = inferior_ptid;
3085 /* NOTE drow/2004-01-17: Is this still necessary? */
3086 /* Make sure that the current_frame's pc is correct. This
3087 is a correction for setting up the frame info before doing
3088 gdbarch_decr_pc_after_break */
3089 if (target_has_execution)
3090 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3091 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3092 frame code to check for this and sort out any resultant mess.
3093 gdbarch_decr_pc_after_break needs to just go away. */
3094 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3096 if (target_has_execution && breakpoints_inserted)
3098 if (remove_breakpoints ())
3100 target_terminal_ours_for_output ();
3101 printf_filtered (_("\
3102 Cannot remove breakpoints because program is no longer writable.\n\
3103 It might be running in another process.\n\
3104 Further execution is probably impossible.\n"));
3107 breakpoints_inserted = 0;
3109 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3110 Delete any breakpoint that is to be deleted at the next stop. */
3112 breakpoint_auto_delete (stop_bpstat);
3114 /* If an auto-display called a function and that got a signal,
3115 delete that auto-display to avoid an infinite recursion. */
3117 if (stopped_by_random_signal)
3118 disable_current_display ();
3120 /* Don't print a message if in the middle of doing a "step n"
3121 operation for n > 1 */
3122 if (step_multi && stop_step)
3125 target_terminal_ours ();
3127 /* Set the current source location. This will also happen if we
3128 display the frame below, but the current SAL will be incorrect
3129 during a user hook-stop function. */
3130 if (target_has_stack && !stop_stack_dummy)
3131 set_current_sal_from_frame (get_current_frame (), 1);
3133 /* Look up the hook_stop and run it (CLI internally handles problem
3134 of stop_command's pre-hook not existing). */
3136 catch_errors (hook_stop_stub, stop_command,
3137 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3139 if (!target_has_stack)
3145 /* Select innermost stack frame - i.e., current frame is frame 0,
3146 and current location is based on that.
3147 Don't do this on return from a stack dummy routine,
3148 or if the program has exited. */
3150 if (!stop_stack_dummy)
3152 select_frame (get_current_frame ());
3154 /* Print current location without a level number, if
3155 we have changed functions or hit a breakpoint.
3156 Print source line if we have one.
3157 bpstat_print() contains the logic deciding in detail
3158 what to print, based on the event(s) that just occurred. */
3160 if (stop_print_frame)
3164 int do_frame_printing = 1;
3166 bpstat_ret = bpstat_print (stop_bpstat);
3170 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3171 (or should) carry around the function and does (or
3172 should) use that when doing a frame comparison. */
3174 && frame_id_eq (step_frame_id,
3175 get_frame_id (get_current_frame ()))
3176 && step_start_function == find_pc_function (stop_pc))
3177 source_flag = SRC_LINE; /* finished step, just print source line */
3179 source_flag = SRC_AND_LOC; /* print location and source line */
3181 case PRINT_SRC_AND_LOC:
3182 source_flag = SRC_AND_LOC; /* print location and source line */
3184 case PRINT_SRC_ONLY:
3185 source_flag = SRC_LINE;
3188 source_flag = SRC_LINE; /* something bogus */
3189 do_frame_printing = 0;
3192 internal_error (__FILE__, __LINE__, _("Unknown value."));
3195 if (ui_out_is_mi_like_p (uiout))
3196 ui_out_field_int (uiout, "thread-id",
3197 pid_to_thread_id (inferior_ptid));
3198 /* The behavior of this routine with respect to the source
3200 SRC_LINE: Print only source line
3201 LOCATION: Print only location
3202 SRC_AND_LOC: Print location and source line */
3203 if (do_frame_printing)
3204 print_stack_frame (get_selected_frame (NULL), 0, source_flag);
3206 /* Display the auto-display expressions. */
3211 /* Save the function value return registers, if we care.
3212 We might be about to restore their previous contents. */
3213 if (proceed_to_finish)
3214 /* NB: The copy goes through to the target picking up the value of
3215 all the registers. */
3216 regcache_cpy (stop_registers, current_regcache);
3218 if (stop_stack_dummy)
3220 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3221 ends with a setting of the current frame, so we can use that
3223 frame_pop (get_current_frame ());
3224 /* Set stop_pc to what it was before we called the function.
3225 Can't rely on restore_inferior_status because that only gets
3226 called if we don't stop in the called function. */
3227 stop_pc = read_pc ();
3228 select_frame (get_current_frame ());
3232 annotate_stopped ();
3233 observer_notify_normal_stop (stop_bpstat);
3237 hook_stop_stub (void *cmd)
3239 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3244 signal_stop_state (int signo)
3246 return signal_stop[signo];
3250 signal_print_state (int signo)
3252 return signal_print[signo];
3256 signal_pass_state (int signo)
3258 return signal_program[signo];
3262 signal_stop_update (int signo, int state)
3264 int ret = signal_stop[signo];
3265 signal_stop[signo] = state;
3270 signal_print_update (int signo, int state)
3272 int ret = signal_print[signo];
3273 signal_print[signo] = state;
3278 signal_pass_update (int signo, int state)
3280 int ret = signal_program[signo];
3281 signal_program[signo] = state;
3286 sig_print_header (void)
3288 printf_filtered (_("\
3289 Signal Stop\tPrint\tPass to program\tDescription\n"));
3293 sig_print_info (enum target_signal oursig)
3295 char *name = target_signal_to_name (oursig);
3296 int name_padding = 13 - strlen (name);
3298 if (name_padding <= 0)
3301 printf_filtered ("%s", name);
3302 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3303 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3304 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3305 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3306 printf_filtered ("%s\n", target_signal_to_string (oursig));
3309 /* Specify how various signals in the inferior should be handled. */
3312 handle_command (char *args, int from_tty)
3315 int digits, wordlen;
3316 int sigfirst, signum, siglast;
3317 enum target_signal oursig;
3320 unsigned char *sigs;
3321 struct cleanup *old_chain;
3325 error_no_arg (_("signal to handle"));
3328 /* Allocate and zero an array of flags for which signals to handle. */
3330 nsigs = (int) TARGET_SIGNAL_LAST;
3331 sigs = (unsigned char *) alloca (nsigs);
3332 memset (sigs, 0, nsigs);
3334 /* Break the command line up into args. */
3336 argv = buildargv (args);
3341 old_chain = make_cleanup_freeargv (argv);
3343 /* Walk through the args, looking for signal oursigs, signal names, and
3344 actions. Signal numbers and signal names may be interspersed with
3345 actions, with the actions being performed for all signals cumulatively
3346 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3348 while (*argv != NULL)
3350 wordlen = strlen (*argv);
3351 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3355 sigfirst = siglast = -1;
3357 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3359 /* Apply action to all signals except those used by the
3360 debugger. Silently skip those. */
3363 siglast = nsigs - 1;
3365 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3367 SET_SIGS (nsigs, sigs, signal_stop);
3368 SET_SIGS (nsigs, sigs, signal_print);
3370 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3372 UNSET_SIGS (nsigs, sigs, signal_program);
3374 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3376 SET_SIGS (nsigs, sigs, signal_print);
3378 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3380 SET_SIGS (nsigs, sigs, signal_program);
3382 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3384 UNSET_SIGS (nsigs, sigs, signal_stop);
3386 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3388 SET_SIGS (nsigs, sigs, signal_program);
3390 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3392 UNSET_SIGS (nsigs, sigs, signal_print);
3393 UNSET_SIGS (nsigs, sigs, signal_stop);
3395 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3397 UNSET_SIGS (nsigs, sigs, signal_program);
3399 else if (digits > 0)
3401 /* It is numeric. The numeric signal refers to our own
3402 internal signal numbering from target.h, not to host/target
3403 signal number. This is a feature; users really should be
3404 using symbolic names anyway, and the common ones like
3405 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3407 sigfirst = siglast = (int)
3408 target_signal_from_command (atoi (*argv));
3409 if ((*argv)[digits] == '-')
3412 target_signal_from_command (atoi ((*argv) + digits + 1));
3414 if (sigfirst > siglast)
3416 /* Bet he didn't figure we'd think of this case... */
3424 oursig = target_signal_from_name (*argv);
3425 if (oursig != TARGET_SIGNAL_UNKNOWN)
3427 sigfirst = siglast = (int) oursig;
3431 /* Not a number and not a recognized flag word => complain. */
3432 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv);
3436 /* If any signal numbers or symbol names were found, set flags for
3437 which signals to apply actions to. */
3439 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3441 switch ((enum target_signal) signum)
3443 case TARGET_SIGNAL_TRAP:
3444 case TARGET_SIGNAL_INT:
3445 if (!allsigs && !sigs[signum])
3447 if (query ("%s is used by the debugger.\n\
3448 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3454 printf_unfiltered (_("Not confirmed, unchanged.\n"));
3455 gdb_flush (gdb_stdout);
3459 case TARGET_SIGNAL_0:
3460 case TARGET_SIGNAL_DEFAULT:
3461 case TARGET_SIGNAL_UNKNOWN:
3462 /* Make sure that "all" doesn't print these. */
3473 target_notice_signals (inferior_ptid);
3477 /* Show the results. */
3478 sig_print_header ();
3479 for (signum = 0; signum < nsigs; signum++)
3483 sig_print_info (signum);
3488 do_cleanups (old_chain);
3492 xdb_handle_command (char *args, int from_tty)
3495 struct cleanup *old_chain;
3497 /* Break the command line up into args. */
3499 argv = buildargv (args);
3504 old_chain = make_cleanup_freeargv (argv);
3505 if (argv[1] != (char *) NULL)
3510 bufLen = strlen (argv[0]) + 20;
3511 argBuf = (char *) xmalloc (bufLen);
3515 enum target_signal oursig;
3517 oursig = target_signal_from_name (argv[0]);
3518 memset (argBuf, 0, bufLen);
3519 if (strcmp (argv[1], "Q") == 0)
3520 sprintf (argBuf, "%s %s", argv[0], "noprint");
3523 if (strcmp (argv[1], "s") == 0)
3525 if (!signal_stop[oursig])
3526 sprintf (argBuf, "%s %s", argv[0], "stop");
3528 sprintf (argBuf, "%s %s", argv[0], "nostop");
3530 else if (strcmp (argv[1], "i") == 0)
3532 if (!signal_program[oursig])
3533 sprintf (argBuf, "%s %s", argv[0], "pass");
3535 sprintf (argBuf, "%s %s", argv[0], "nopass");
3537 else if (strcmp (argv[1], "r") == 0)
3539 if (!signal_print[oursig])
3540 sprintf (argBuf, "%s %s", argv[0], "print");
3542 sprintf (argBuf, "%s %s", argv[0], "noprint");
3548 handle_command (argBuf, from_tty);
3550 printf_filtered (_("Invalid signal handling flag.\n"));
3555 do_cleanups (old_chain);
3558 /* Print current contents of the tables set by the handle command.
3559 It is possible we should just be printing signals actually used
3560 by the current target (but for things to work right when switching
3561 targets, all signals should be in the signal tables). */
3564 signals_info (char *signum_exp, int from_tty)
3566 enum target_signal oursig;
3567 sig_print_header ();
3571 /* First see if this is a symbol name. */
3572 oursig = target_signal_from_name (signum_exp);
3573 if (oursig == TARGET_SIGNAL_UNKNOWN)
3575 /* No, try numeric. */
3577 target_signal_from_command (parse_and_eval_long (signum_exp));
3579 sig_print_info (oursig);
3583 printf_filtered ("\n");
3584 /* These ugly casts brought to you by the native VAX compiler. */
3585 for (oursig = TARGET_SIGNAL_FIRST;
3586 (int) oursig < (int) TARGET_SIGNAL_LAST;
3587 oursig = (enum target_signal) ((int) oursig + 1))
3591 if (oursig != TARGET_SIGNAL_UNKNOWN
3592 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3593 sig_print_info (oursig);
3596 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
3599 struct inferior_status
3601 enum target_signal stop_signal;
3605 int stop_stack_dummy;
3606 int stopped_by_random_signal;
3608 CORE_ADDR step_range_start;
3609 CORE_ADDR step_range_end;
3610 struct frame_id step_frame_id;
3611 enum step_over_calls_kind step_over_calls;
3612 CORE_ADDR step_resume_break_address;
3613 int stop_after_trap;
3615 struct regcache *stop_registers;
3617 /* These are here because if call_function_by_hand has written some
3618 registers and then decides to call error(), we better not have changed
3620 struct regcache *registers;
3622 /* A frame unique identifier. */
3623 struct frame_id selected_frame_id;
3625 int breakpoint_proceeded;
3626 int restore_stack_info;
3627 int proceed_to_finish;
3631 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3634 int size = register_size (current_gdbarch, regno);
3635 void *buf = alloca (size);
3636 store_signed_integer (buf, size, val);
3637 regcache_raw_write (inf_status->registers, regno, buf);
3640 /* Save all of the information associated with the inferior<==>gdb
3641 connection. INF_STATUS is a pointer to a "struct inferior_status"
3642 (defined in inferior.h). */
3644 struct inferior_status *
3645 save_inferior_status (int restore_stack_info)
3647 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3649 inf_status->stop_signal = stop_signal;
3650 inf_status->stop_pc = stop_pc;
3651 inf_status->stop_step = stop_step;
3652 inf_status->stop_stack_dummy = stop_stack_dummy;
3653 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3654 inf_status->trap_expected = trap_expected;
3655 inf_status->step_range_start = step_range_start;
3656 inf_status->step_range_end = step_range_end;
3657 inf_status->step_frame_id = step_frame_id;
3658 inf_status->step_over_calls = step_over_calls;
3659 inf_status->stop_after_trap = stop_after_trap;
3660 inf_status->stop_soon = stop_soon;
3661 /* Save original bpstat chain here; replace it with copy of chain.
3662 If caller's caller is walking the chain, they'll be happier if we
3663 hand them back the original chain when restore_inferior_status is
3665 inf_status->stop_bpstat = stop_bpstat;
3666 stop_bpstat = bpstat_copy (stop_bpstat);
3667 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3668 inf_status->restore_stack_info = restore_stack_info;
3669 inf_status->proceed_to_finish = proceed_to_finish;
3671 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3673 inf_status->registers = regcache_dup (current_regcache);
3675 inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL));
3680 restore_selected_frame (void *args)
3682 struct frame_id *fid = (struct frame_id *) args;
3683 struct frame_info *frame;
3685 frame = frame_find_by_id (*fid);
3687 /* If inf_status->selected_frame_id is NULL, there was no previously
3691 warning (_("Unable to restore previously selected frame."));
3695 select_frame (frame);
3701 restore_inferior_status (struct inferior_status *inf_status)
3703 stop_signal = inf_status->stop_signal;
3704 stop_pc = inf_status->stop_pc;
3705 stop_step = inf_status->stop_step;
3706 stop_stack_dummy = inf_status->stop_stack_dummy;
3707 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3708 trap_expected = inf_status->trap_expected;
3709 step_range_start = inf_status->step_range_start;
3710 step_range_end = inf_status->step_range_end;
3711 step_frame_id = inf_status->step_frame_id;
3712 step_over_calls = inf_status->step_over_calls;
3713 stop_after_trap = inf_status->stop_after_trap;
3714 stop_soon = inf_status->stop_soon;
3715 bpstat_clear (&stop_bpstat);
3716 stop_bpstat = inf_status->stop_bpstat;
3717 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3718 proceed_to_finish = inf_status->proceed_to_finish;
3720 /* FIXME: Is the restore of stop_registers always needed. */
3721 regcache_xfree (stop_registers);
3722 stop_registers = inf_status->stop_registers;
3724 /* The inferior can be gone if the user types "print exit(0)"
3725 (and perhaps other times). */
3726 if (target_has_execution)
3727 /* NB: The register write goes through to the target. */
3728 regcache_cpy (current_regcache, inf_status->registers);
3729 regcache_xfree (inf_status->registers);
3731 /* FIXME: If we are being called after stopping in a function which
3732 is called from gdb, we should not be trying to restore the
3733 selected frame; it just prints a spurious error message (The
3734 message is useful, however, in detecting bugs in gdb (like if gdb
3735 clobbers the stack)). In fact, should we be restoring the
3736 inferior status at all in that case? . */
3738 if (target_has_stack && inf_status->restore_stack_info)
3740 /* The point of catch_errors is that if the stack is clobbered,
3741 walking the stack might encounter a garbage pointer and
3742 error() trying to dereference it. */
3744 (restore_selected_frame, &inf_status->selected_frame_id,
3745 "Unable to restore previously selected frame:\n",
3746 RETURN_MASK_ERROR) == 0)
3747 /* Error in restoring the selected frame. Select the innermost
3749 select_frame (get_current_frame ());
3757 do_restore_inferior_status_cleanup (void *sts)
3759 restore_inferior_status (sts);
3763 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3765 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3769 discard_inferior_status (struct inferior_status *inf_status)
3771 /* See save_inferior_status for info on stop_bpstat. */
3772 bpstat_clear (&inf_status->stop_bpstat);
3773 regcache_xfree (inf_status->registers);
3774 regcache_xfree (inf_status->stop_registers);
3779 inferior_has_forked (int pid, int *child_pid)
3781 struct target_waitstatus last;
3784 get_last_target_status (&last_ptid, &last);
3786 if (last.kind != TARGET_WAITKIND_FORKED)
3789 if (ptid_get_pid (last_ptid) != pid)
3792 *child_pid = last.value.related_pid;
3797 inferior_has_vforked (int pid, int *child_pid)
3799 struct target_waitstatus last;
3802 get_last_target_status (&last_ptid, &last);
3804 if (last.kind != TARGET_WAITKIND_VFORKED)
3807 if (ptid_get_pid (last_ptid) != pid)
3810 *child_pid = last.value.related_pid;
3815 inferior_has_execd (int pid, char **execd_pathname)
3817 struct target_waitstatus last;
3820 get_last_target_status (&last_ptid, &last);
3822 if (last.kind != TARGET_WAITKIND_EXECD)
3825 if (ptid_get_pid (last_ptid) != pid)
3828 *execd_pathname = xstrdup (last.value.execd_pathname);
3832 /* Oft used ptids */
3834 ptid_t minus_one_ptid;
3836 /* Create a ptid given the necessary PID, LWP, and TID components. */
3839 ptid_build (int pid, long lwp, long tid)
3849 /* Create a ptid from just a pid. */
3852 pid_to_ptid (int pid)
3854 return ptid_build (pid, 0, 0);
3857 /* Fetch the pid (process id) component from a ptid. */
3860 ptid_get_pid (ptid_t ptid)
3865 /* Fetch the lwp (lightweight process) component from a ptid. */
3868 ptid_get_lwp (ptid_t ptid)
3873 /* Fetch the tid (thread id) component from a ptid. */
3876 ptid_get_tid (ptid_t ptid)
3881 /* ptid_equal() is used to test equality of two ptids. */
3884 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3886 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3887 && ptid1.tid == ptid2.tid);
3890 /* restore_inferior_ptid() will be used by the cleanup machinery
3891 to restore the inferior_ptid value saved in a call to
3892 save_inferior_ptid(). */
3895 restore_inferior_ptid (void *arg)
3897 ptid_t *saved_ptid_ptr = arg;
3898 inferior_ptid = *saved_ptid_ptr;
3902 /* Save the value of inferior_ptid so that it may be restored by a
3903 later call to do_cleanups(). Returns the struct cleanup pointer
3904 needed for later doing the cleanup. */
3907 save_inferior_ptid (void)
3909 ptid_t *saved_ptid_ptr;
3911 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3912 *saved_ptid_ptr = inferior_ptid;
3913 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3920 stop_registers = regcache_xmalloc (current_gdbarch);
3924 _initialize_infrun (void)
3928 struct cmd_list_element *c;
3930 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers);
3931 deprecated_register_gdbarch_swap (NULL, 0, build_infrun);
3933 add_info ("signals", signals_info, _("\
3934 What debugger does when program gets various signals.\n\
3935 Specify a signal as argument to print info on that signal only."));
3936 add_info_alias ("handle", "signals", 0);
3938 add_com ("handle", class_run, handle_command, _("\
3939 Specify how to handle a signal.\n\
3940 Args are signals and actions to apply to those signals.\n\
3941 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3942 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3943 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3944 The special arg \"all\" is recognized to mean all signals except those\n\
3945 used by the debugger, typically SIGTRAP and SIGINT.\n\
3946 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3947 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3948 Stop means reenter debugger if this signal happens (implies print).\n\
3949 Print means print a message if this signal happens.\n\
3950 Pass means let program see this signal; otherwise program doesn't know.\n\
3951 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3952 Pass and Stop may be combined."));
3955 add_com ("lz", class_info, signals_info, _("\
3956 What debugger does when program gets various signals.\n\
3957 Specify a signal as argument to print info on that signal only."));
3958 add_com ("z", class_run, xdb_handle_command, _("\
3959 Specify how to handle a signal.\n\
3960 Args are signals and actions to apply to those signals.\n\
3961 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3962 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3963 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3964 The special arg \"all\" is recognized to mean all signals except those\n\
3965 used by the debugger, typically SIGTRAP and SIGINT.\n\
3966 Recognized actions include \"s\" (toggles between stop and nostop), \n\
3967 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3968 nopass), \"Q\" (noprint)\n\
3969 Stop means reenter debugger if this signal happens (implies print).\n\
3970 Print means print a message if this signal happens.\n\
3971 Pass means let program see this signal; otherwise program doesn't know.\n\
3972 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3973 Pass and Stop may be combined."));
3977 stop_command = add_cmd ("stop", class_obscure,
3978 not_just_help_class_command, _("\
3979 There is no `stop' command, but you can set a hook on `stop'.\n\
3980 This allows you to set a list of commands to be run each time execution\n\
3981 of the program stops."), &cmdlist);
3983 add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\
3984 Set inferior debugging."), _("\
3985 Show inferior debugging."), _("\
3986 When non-zero, inferior specific debugging is enabled."),
3989 &setdebuglist, &showdebuglist);
3991 numsigs = (int) TARGET_SIGNAL_LAST;
3992 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
3993 signal_print = (unsigned char *)
3994 xmalloc (sizeof (signal_print[0]) * numsigs);
3995 signal_program = (unsigned char *)
3996 xmalloc (sizeof (signal_program[0]) * numsigs);
3997 for (i = 0; i < numsigs; i++)
4000 signal_print[i] = 1;
4001 signal_program[i] = 1;
4004 /* Signals caused by debugger's own actions
4005 should not be given to the program afterwards. */
4006 signal_program[TARGET_SIGNAL_TRAP] = 0;
4007 signal_program[TARGET_SIGNAL_INT] = 0;
4009 /* Signals that are not errors should not normally enter the debugger. */
4010 signal_stop[TARGET_SIGNAL_ALRM] = 0;
4011 signal_print[TARGET_SIGNAL_ALRM] = 0;
4012 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
4013 signal_print[TARGET_SIGNAL_VTALRM] = 0;
4014 signal_stop[TARGET_SIGNAL_PROF] = 0;
4015 signal_print[TARGET_SIGNAL_PROF] = 0;
4016 signal_stop[TARGET_SIGNAL_CHLD] = 0;
4017 signal_print[TARGET_SIGNAL_CHLD] = 0;
4018 signal_stop[TARGET_SIGNAL_IO] = 0;
4019 signal_print[TARGET_SIGNAL_IO] = 0;
4020 signal_stop[TARGET_SIGNAL_POLL] = 0;
4021 signal_print[TARGET_SIGNAL_POLL] = 0;
4022 signal_stop[TARGET_SIGNAL_URG] = 0;
4023 signal_print[TARGET_SIGNAL_URG] = 0;
4024 signal_stop[TARGET_SIGNAL_WINCH] = 0;
4025 signal_print[TARGET_SIGNAL_WINCH] = 0;
4027 /* These signals are used internally by user-level thread
4028 implementations. (See signal(5) on Solaris.) Like the above
4029 signals, a healthy program receives and handles them as part of
4030 its normal operation. */
4031 signal_stop[TARGET_SIGNAL_LWP] = 0;
4032 signal_print[TARGET_SIGNAL_LWP] = 0;
4033 signal_stop[TARGET_SIGNAL_WAITING] = 0;
4034 signal_print[TARGET_SIGNAL_WAITING] = 0;
4035 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4036 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4038 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support,
4039 &stop_on_solib_events, _("\
4040 Set stopping for shared library events."), _("\
4041 Show stopping for shared library events."), _("\
4042 If nonzero, gdb will give control to the user when the dynamic linker\n\
4043 notifies gdb of shared library events. The most common event of interest\n\
4044 to the user would be loading/unloading of a new library."),
4046 show_stop_on_solib_events,
4047 &setlist, &showlist);
4049 add_setshow_enum_cmd ("follow-fork-mode", class_run,
4050 follow_fork_mode_kind_names,
4051 &follow_fork_mode_string, _("\
4052 Set debugger response to a program call of fork or vfork."), _("\
4053 Show debugger response to a program call of fork or vfork."), _("\
4054 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4055 parent - the original process is debugged after a fork\n\
4056 child - the new process is debugged after a fork\n\
4057 The unfollowed process will continue to run.\n\
4058 By default, the debugger will follow the parent process."),
4060 show_follow_fork_mode_string,
4061 &setlist, &showlist);
4063 add_setshow_enum_cmd ("scheduler-locking", class_run,
4064 scheduler_enums, &scheduler_mode, _("\
4065 Set mode for locking scheduler during execution."), _("\
4066 Show mode for locking scheduler during execution."), _("\
4067 off == no locking (threads may preempt at any time)\n\
4068 on == full locking (no thread except the current thread may run)\n\
4069 step == scheduler locked during every single-step operation.\n\
4070 In this mode, no other thread may run during a step command.\n\
4071 Other threads may run while stepping over a function call ('next')."),
4072 set_schedlock_func, /* traps on target vector */
4073 show_scheduler_mode,
4074 &setlist, &showlist);
4076 add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\
4077 Set mode of the step operation."), _("\
4078 Show mode of the step operation."), _("\
4079 When set, doing a step over a function without debug line information\n\
4080 will stop at the first instruction of that function. Otherwise, the\n\
4081 function is skipped and the step command stops at a different source line."),
4083 show_step_stop_if_no_debug,
4084 &setlist, &showlist);
4086 /* ptid initializations */
4087 null_ptid = ptid_build (0, 0, 0);
4088 minus_one_ptid = ptid_build (-1, 0, 0);
4089 inferior_ptid = null_ptid;
4090 target_last_wait_ptid = minus_one_ptid;