1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
6 Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
31 #include "breakpoint.h"
35 #include "cli/cli-script.h"
37 #include "gdbthread.h"
47 #include "gdb_assert.h"
49 /* Prototypes for local functions */
51 static void signals_info (char *, int);
53 static void handle_command (char *, int);
55 static void sig_print_info (enum target_signal);
57 static void sig_print_header (void);
59 static void resume_cleanups (void *);
61 static int hook_stop_stub (void *);
63 static int restore_selected_frame (void *);
65 static void build_infrun (void);
67 static int follow_fork (void);
69 static void set_schedlock_func (char *args, int from_tty,
70 struct cmd_list_element *c);
72 struct execution_control_state;
74 static int currently_stepping (struct execution_control_state *ecs);
76 static void xdb_handle_command (char *args, int from_tty);
78 static int prepare_to_proceed (void);
80 void _initialize_infrun (void);
82 int inferior_ignoring_startup_exec_events = 0;
83 int inferior_ignoring_leading_exec_events = 0;
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug = 0;
90 /* In asynchronous mode, but simulating synchronous execution. */
92 int sync_execution = 0;
94 /* wait_for_inferior and normal_stop use this to notify the user
95 when the inferior stopped in a different thread than it had been
98 static ptid_t previous_inferior_ptid;
100 /* This is true for configurations that may follow through execl() and
101 similar functions. At present this is only true for HP-UX native. */
103 #ifndef MAY_FOLLOW_EXEC
104 #define MAY_FOLLOW_EXEC (0)
107 static int may_follow_exec = MAY_FOLLOW_EXEC;
109 /* If the program uses ELF-style shared libraries, then calls to
110 functions in shared libraries go through stubs, which live in a
111 table called the PLT (Procedure Linkage Table). The first time the
112 function is called, the stub sends control to the dynamic linker,
113 which looks up the function's real address, patches the stub so
114 that future calls will go directly to the function, and then passes
115 control to the function.
117 If we are stepping at the source level, we don't want to see any of
118 this --- we just want to skip over the stub and the dynamic linker.
119 The simple approach is to single-step until control leaves the
122 However, on some systems (e.g., Red Hat's 5.2 distribution) the
123 dynamic linker calls functions in the shared C library, so you
124 can't tell from the PC alone whether the dynamic linker is still
125 running. In this case, we use a step-resume breakpoint to get us
126 past the dynamic linker, as if we were using "next" to step over a
129 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
130 linker code or not. Normally, this means we single-step. However,
131 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
132 address where we can place a step-resume breakpoint to get past the
133 linker's symbol resolution function.
135 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
136 pretty portable way, by comparing the PC against the address ranges
137 of the dynamic linker's sections.
139 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
140 it depends on internal details of the dynamic linker. It's usually
141 not too hard to figure out where to put a breakpoint, but it
142 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
143 sanity checking. If it can't figure things out, returning zero and
144 getting the (possibly confusing) stepping behavior is better than
145 signalling an error, which will obscure the change in the
148 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
149 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
152 /* This function returns TRUE if pc is the address of an instruction
153 that lies within the dynamic linker (such as the event hook, or the
156 This function must be used only when a dynamic linker event has
157 been caught, and the inferior is being stepped out of the hook, or
158 undefined results are guaranteed. */
160 #ifndef SOLIB_IN_DYNAMIC_LINKER
161 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
164 /* On MIPS16, a function that returns a floating point value may call
165 a library helper function to copy the return value to a floating point
166 register. The IGNORE_HELPER_CALL macro returns non-zero if we
167 should ignore (i.e. step over) this function call. */
168 #ifndef IGNORE_HELPER_CALL
169 #define IGNORE_HELPER_CALL(pc) 0
172 /* On some systems, the PC may be left pointing at an instruction that won't
173 actually be executed. This is usually indicated by a bit in the PSW. If
174 we find ourselves in such a state, then we step the target beyond the
175 nullified instruction before returning control to the user so as to avoid
178 #ifndef INSTRUCTION_NULLIFIED
179 #define INSTRUCTION_NULLIFIED 0
182 /* We can't step off a permanent breakpoint in the ordinary way, because we
183 can't remove it. Instead, we have to advance the PC to the next
184 instruction. This macro should expand to a pointer to a function that
185 does that, or zero if we have no such function. If we don't have a
186 definition for it, we have to report an error. */
187 #ifndef SKIP_PERMANENT_BREAKPOINT
188 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
190 default_skip_permanent_breakpoint (void)
193 The program is stopped at a permanent breakpoint, but GDB does not know\n\
194 how to step past a permanent breakpoint on this architecture. Try using\n\
195 a command like `return' or `jump' to continue execution.");
200 /* Convert the #defines into values. This is temporary until wfi control
201 flow is completely sorted out. */
203 #ifndef HAVE_STEPPABLE_WATCHPOINT
204 #define HAVE_STEPPABLE_WATCHPOINT 0
206 #undef HAVE_STEPPABLE_WATCHPOINT
207 #define HAVE_STEPPABLE_WATCHPOINT 1
210 #ifndef CANNOT_STEP_HW_WATCHPOINTS
211 #define CANNOT_STEP_HW_WATCHPOINTS 0
213 #undef CANNOT_STEP_HW_WATCHPOINTS
214 #define CANNOT_STEP_HW_WATCHPOINTS 1
217 /* Tables of how to react to signals; the user sets them. */
219 static unsigned char *signal_stop;
220 static unsigned char *signal_print;
221 static unsigned char *signal_program;
223 #define SET_SIGS(nsigs,sigs,flags) \
225 int signum = (nsigs); \
226 while (signum-- > 0) \
227 if ((sigs)[signum]) \
228 (flags)[signum] = 1; \
231 #define UNSET_SIGS(nsigs,sigs,flags) \
233 int signum = (nsigs); \
234 while (signum-- > 0) \
235 if ((sigs)[signum]) \
236 (flags)[signum] = 0; \
239 /* Value to pass to target_resume() to cause all threads to resume */
241 #define RESUME_ALL (pid_to_ptid (-1))
243 /* Command list pointer for the "stop" placeholder. */
245 static struct cmd_list_element *stop_command;
247 /* Nonzero if breakpoints are now inserted in the inferior. */
249 static int breakpoints_inserted;
251 /* Function inferior was in as of last step command. */
253 static struct symbol *step_start_function;
255 /* Nonzero if we are expecting a trace trap and should proceed from it. */
257 static int trap_expected;
260 /* Nonzero if we want to give control to the user when we're notified
261 of shared library events by the dynamic linker. */
262 static int stop_on_solib_events;
266 /* Nonzero if the next time we try to continue the inferior, it will
267 step one instruction and generate a spurious trace trap.
268 This is used to compensate for a bug in HP-UX. */
270 static int trap_expected_after_continue;
273 /* Nonzero means expecting a trace trap
274 and should stop the inferior and return silently when it happens. */
278 /* Nonzero means expecting a trap and caller will handle it themselves.
279 It is used after attach, due to attaching to a process;
280 when running in the shell before the child program has been exec'd;
281 and when running some kinds of remote stuff (FIXME?). */
283 enum stop_kind stop_soon;
285 /* Nonzero if proceed is being used for a "finish" command or a similar
286 situation when stop_registers should be saved. */
288 int proceed_to_finish;
290 /* Save register contents here when about to pop a stack dummy frame,
291 if-and-only-if proceed_to_finish is set.
292 Thus this contains the return value from the called function (assuming
293 values are returned in a register). */
295 struct regcache *stop_registers;
297 /* Nonzero if program stopped due to error trying to insert breakpoints. */
299 static int breakpoints_failed;
301 /* Nonzero after stop if current stack frame should be printed. */
303 static int stop_print_frame;
305 static struct breakpoint *step_resume_breakpoint = NULL;
307 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
308 interactions with an inferior that is running a kernel function
309 (aka, a system call or "syscall"). wait_for_inferior therefore
310 may have a need to know when the inferior is in a syscall. This
311 is a count of the number of inferior threads which are known to
312 currently be running in a syscall. */
313 static int number_of_threads_in_syscalls;
315 /* This is a cached copy of the pid/waitstatus of the last event
316 returned by target_wait()/deprecated_target_wait_hook(). This
317 information is returned by get_last_target_status(). */
318 static ptid_t target_last_wait_ptid;
319 static struct target_waitstatus target_last_waitstatus;
321 /* This is used to remember when a fork, vfork or exec event
322 was caught by a catchpoint, and thus the event is to be
323 followed at the next resume of the inferior, and not
327 enum target_waitkind kind;
334 char *execd_pathname;
338 static const char follow_fork_mode_child[] = "child";
339 static const char follow_fork_mode_parent[] = "parent";
341 static const char *follow_fork_mode_kind_names[] = {
342 follow_fork_mode_child,
343 follow_fork_mode_parent,
347 static const char *follow_fork_mode_string = follow_fork_mode_parent;
353 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
355 return target_follow_fork (follow_child);
359 follow_inferior_reset_breakpoints (void)
361 /* Was there a step_resume breakpoint? (There was if the user
362 did a "next" at the fork() call.) If so, explicitly reset its
365 step_resumes are a form of bp that are made to be per-thread.
366 Since we created the step_resume bp when the parent process
367 was being debugged, and now are switching to the child process,
368 from the breakpoint package's viewpoint, that's a switch of
369 "threads". We must update the bp's notion of which thread
370 it is for, or it'll be ignored when it triggers. */
372 if (step_resume_breakpoint)
373 breakpoint_re_set_thread (step_resume_breakpoint);
375 /* Reinsert all breakpoints in the child. The user may have set
376 breakpoints after catching the fork, in which case those
377 were never set in the child, but only in the parent. This makes
378 sure the inserted breakpoints match the breakpoint list. */
380 breakpoint_re_set ();
381 insert_breakpoints ();
384 /* EXECD_PATHNAME is assumed to be non-NULL. */
387 follow_exec (int pid, char *execd_pathname)
390 struct target_ops *tgt;
392 if (!may_follow_exec)
395 /* This is an exec event that we actually wish to pay attention to.
396 Refresh our symbol table to the newly exec'd program, remove any
399 If there are breakpoints, they aren't really inserted now,
400 since the exec() transformed our inferior into a fresh set
403 We want to preserve symbolic breakpoints on the list, since
404 we have hopes that they can be reset after the new a.out's
405 symbol table is read.
407 However, any "raw" breakpoints must be removed from the list
408 (e.g., the solib bp's), since their address is probably invalid
411 And, we DON'T want to call delete_breakpoints() here, since
412 that may write the bp's "shadow contents" (the instruction
413 value that was overwritten witha TRAP instruction). Since
414 we now have a new a.out, those shadow contents aren't valid. */
415 update_breakpoints_after_exec ();
417 /* If there was one, it's gone now. We cannot truly step-to-next
418 statement through an exec(). */
419 step_resume_breakpoint = NULL;
420 step_range_start = 0;
423 /* What is this a.out's name? */
424 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
426 /* We've followed the inferior through an exec. Therefore, the
427 inferior has essentially been killed & reborn. */
429 /* First collect the run target in effect. */
430 tgt = find_run_target ();
431 /* If we can't find one, things are in a very strange state... */
433 error ("Could find run target to save before following exec");
435 gdb_flush (gdb_stdout);
436 target_mourn_inferior ();
437 inferior_ptid = pid_to_ptid (saved_pid);
438 /* Because mourn_inferior resets inferior_ptid. */
441 /* That a.out is now the one to use. */
442 exec_file_attach (execd_pathname, 0);
444 /* And also is where symbols can be found. */
445 symbol_file_add_main (execd_pathname, 0);
447 /* Reset the shared library package. This ensures that we get
448 a shlib event when the child reaches "_start", at which point
449 the dld will have had a chance to initialize the child. */
450 #if defined(SOLIB_RESTART)
453 #ifdef SOLIB_CREATE_INFERIOR_HOOK
454 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
457 /* Reinsert all breakpoints. (Those which were symbolic have
458 been reset to the proper address in the new a.out, thanks
459 to symbol_file_command...) */
460 insert_breakpoints ();
462 /* The next resume of this inferior should bring it to the shlib
463 startup breakpoints. (If the user had also set bp's on
464 "main" from the old (parent) process, then they'll auto-
465 matically get reset there in the new process.) */
468 /* Non-zero if we just simulating a single-step. This is needed
469 because we cannot remove the breakpoints in the inferior process
470 until after the `wait' in `wait_for_inferior'. */
471 static int singlestep_breakpoints_inserted_p = 0;
473 /* The thread we inserted single-step breakpoints for. */
474 static ptid_t singlestep_ptid;
476 /* If another thread hit the singlestep breakpoint, we save the original
477 thread here so that we can resume single-stepping it later. */
478 static ptid_t saved_singlestep_ptid;
479 static int stepping_past_singlestep_breakpoint;
482 /* Things to clean up if we QUIT out of resume (). */
484 resume_cleanups (void *ignore)
489 static const char schedlock_off[] = "off";
490 static const char schedlock_on[] = "on";
491 static const char schedlock_step[] = "step";
492 static const char *scheduler_mode = schedlock_off;
493 static const char *scheduler_enums[] = {
501 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
503 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
504 the set command passed as a parameter. The clone operation will
505 include (BUG?) any ``set'' command callback, if present.
506 Commands like ``info set'' call all the ``show'' command
507 callbacks. Unfortunately, for ``show'' commands cloned from
508 ``set'', this includes callbacks belonging to ``set'' commands.
509 Making this worse, this only occures if add_show_from_set() is
510 called after add_cmd_sfunc() (BUG?). */
511 if (cmd_type (c) == set_cmd)
512 if (!target_can_lock_scheduler)
514 scheduler_mode = schedlock_off;
515 error ("Target '%s' cannot support this command.", target_shortname);
520 /* Resume the inferior, but allow a QUIT. This is useful if the user
521 wants to interrupt some lengthy single-stepping operation
522 (for child processes, the SIGINT goes to the inferior, and so
523 we get a SIGINT random_signal, but for remote debugging and perhaps
524 other targets, that's not true).
526 STEP nonzero if we should step (zero to continue instead).
527 SIG is the signal to give the inferior (zero for none). */
529 resume (int step, enum target_signal sig)
531 int should_resume = 1;
532 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
535 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
538 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
539 over an instruction that causes a page fault without triggering
540 a hardware watchpoint. The kernel properly notices that it shouldn't
541 stop, because the hardware watchpoint is not triggered, but it forgets
542 the step request and continues the program normally.
543 Work around the problem by removing hardware watchpoints if a step is
544 requested, GDB will check for a hardware watchpoint trigger after the
546 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
547 remove_hw_watchpoints ();
550 /* Normally, by the time we reach `resume', the breakpoints are either
551 removed or inserted, as appropriate. The exception is if we're sitting
552 at a permanent breakpoint; we need to step over it, but permanent
553 breakpoints can't be removed. So we have to test for it here. */
554 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
555 SKIP_PERMANENT_BREAKPOINT ();
557 if (SOFTWARE_SINGLE_STEP_P () && step)
559 /* Do it the hard way, w/temp breakpoints */
560 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
561 /* ...and don't ask hardware to do it. */
563 /* and do not pull these breakpoints until after a `wait' in
564 `wait_for_inferior' */
565 singlestep_breakpoints_inserted_p = 1;
566 singlestep_ptid = inferior_ptid;
569 /* If there were any forks/vforks/execs that were caught and are
570 now to be followed, then do so. */
571 switch (pending_follow.kind)
573 case TARGET_WAITKIND_FORKED:
574 case TARGET_WAITKIND_VFORKED:
575 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
580 case TARGET_WAITKIND_EXECD:
581 /* follow_exec is called as soon as the exec event is seen. */
582 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
589 /* Install inferior's terminal modes. */
590 target_terminal_inferior ();
596 resume_ptid = RESUME_ALL; /* Default */
598 if ((step || singlestep_breakpoints_inserted_p) &&
599 (stepping_past_singlestep_breakpoint
600 || (!breakpoints_inserted && breakpoint_here_p (read_pc ()))))
602 /* Stepping past a breakpoint without inserting breakpoints.
603 Make sure only the current thread gets to step, so that
604 other threads don't sneak past breakpoints while they are
607 resume_ptid = inferior_ptid;
610 if ((scheduler_mode == schedlock_on) ||
611 (scheduler_mode == schedlock_step &&
612 (step || singlestep_breakpoints_inserted_p)))
614 /* User-settable 'scheduler' mode requires solo thread resume. */
615 resume_ptid = inferior_ptid;
618 if (CANNOT_STEP_BREAKPOINT)
620 /* Most targets can step a breakpoint instruction, thus
621 executing it normally. But if this one cannot, just
622 continue and we will hit it anyway. */
623 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
626 target_resume (resume_ptid, step, sig);
629 discard_cleanups (old_cleanups);
633 /* Clear out all variables saying what to do when inferior is continued.
634 First do this, then set the ones you want, then call `proceed'. */
637 clear_proceed_status (void)
640 step_range_start = 0;
642 step_frame_id = null_frame_id;
643 step_over_calls = STEP_OVER_UNDEBUGGABLE;
645 stop_soon = NO_STOP_QUIETLY;
646 proceed_to_finish = 0;
647 breakpoint_proceeded = 1; /* We're about to proceed... */
649 /* Discard any remaining commands or status from previous stop. */
650 bpstat_clear (&stop_bpstat);
653 /* This should be suitable for any targets that support threads. */
656 prepare_to_proceed (void)
659 struct target_waitstatus wait_status;
661 /* Get the last target status returned by target_wait(). */
662 get_last_target_status (&wait_ptid, &wait_status);
664 /* Make sure we were stopped either at a breakpoint, or because
666 if (wait_status.kind != TARGET_WAITKIND_STOPPED
667 || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
668 wait_status.value.sig != TARGET_SIGNAL_INT))
673 if (!ptid_equal (wait_ptid, minus_one_ptid)
674 && !ptid_equal (inferior_ptid, wait_ptid))
676 /* Switched over from WAIT_PID. */
677 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
679 if (wait_pc != read_pc ())
681 /* Switch back to WAIT_PID thread. */
682 inferior_ptid = wait_ptid;
684 /* FIXME: This stuff came from switch_to_thread() in
685 thread.c (which should probably be a public function). */
686 flush_cached_frames ();
687 registers_changed ();
689 select_frame (get_current_frame ());
692 /* We return 1 to indicate that there is a breakpoint here,
693 so we need to step over it before continuing to avoid
694 hitting it straight away. */
695 if (breakpoint_here_p (wait_pc))
703 /* Record the pc of the program the last time it stopped. This is
704 just used internally by wait_for_inferior, but need to be preserved
705 over calls to it and cleared when the inferior is started. */
706 static CORE_ADDR prev_pc;
708 /* Basic routine for continuing the program in various fashions.
710 ADDR is the address to resume at, or -1 for resume where stopped.
711 SIGGNAL is the signal to give it, or 0 for none,
712 or -1 for act according to how it stopped.
713 STEP is nonzero if should trap after one instruction.
714 -1 means return after that and print nothing.
715 You should probably set various step_... variables
716 before calling here, if you are stepping.
718 You should call clear_proceed_status before calling proceed. */
721 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
726 step_start_function = find_pc_function (read_pc ());
730 if (addr == (CORE_ADDR) -1)
732 /* If there is a breakpoint at the address we will resume at,
733 step one instruction before inserting breakpoints
734 so that we do not stop right away (and report a second
735 hit at this breakpoint). */
737 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
740 #ifndef STEP_SKIPS_DELAY
741 #define STEP_SKIPS_DELAY(pc) (0)
742 #define STEP_SKIPS_DELAY_P (0)
744 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
745 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
746 is slow (it needs to read memory from the target). */
747 if (STEP_SKIPS_DELAY_P
748 && breakpoint_here_p (read_pc () + 4)
749 && STEP_SKIPS_DELAY (read_pc ()))
757 /* In a multi-threaded task we may select another thread
758 and then continue or step.
760 But if the old thread was stopped at a breakpoint, it
761 will immediately cause another breakpoint stop without
762 any execution (i.e. it will report a breakpoint hit
763 incorrectly). So we must step over it first.
765 prepare_to_proceed checks the current thread against the thread
766 that reported the most recent event. If a step-over is required
767 it returns TRUE and sets the current thread to the old thread. */
768 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
772 if (trap_expected_after_continue)
774 /* If (step == 0), a trap will be automatically generated after
775 the first instruction is executed. Force step one
776 instruction to clear this condition. This should not occur
777 if step is nonzero, but it is harmless in that case. */
779 trap_expected_after_continue = 0;
781 #endif /* HP_OS_BUG */
784 /* We will get a trace trap after one instruction.
785 Continue it automatically and insert breakpoints then. */
789 insert_breakpoints ();
790 /* If we get here there was no call to error() in
791 insert breakpoints -- so they were inserted. */
792 breakpoints_inserted = 1;
795 if (siggnal != TARGET_SIGNAL_DEFAULT)
796 stop_signal = siggnal;
797 /* If this signal should not be seen by program,
798 give it zero. Used for debugging signals. */
799 else if (!signal_program[stop_signal])
800 stop_signal = TARGET_SIGNAL_0;
802 annotate_starting ();
804 /* Make sure that output from GDB appears before output from the
806 gdb_flush (gdb_stdout);
808 /* Refresh prev_pc value just prior to resuming. This used to be
809 done in stop_stepping, however, setting prev_pc there did not handle
810 scenarios such as inferior function calls or returning from
811 a function via the return command. In those cases, the prev_pc
812 value was not set properly for subsequent commands. The prev_pc value
813 is used to initialize the starting line number in the ecs. With an
814 invalid value, the gdb next command ends up stopping at the position
815 represented by the next line table entry past our start position.
816 On platforms that generate one line table entry per line, this
817 is not a problem. However, on the ia64, the compiler generates
818 extraneous line table entries that do not increase the line number.
819 When we issue the gdb next command on the ia64 after an inferior call
820 or a return command, we often end up a few instructions forward, still
821 within the original line we started.
823 An attempt was made to have init_execution_control_state () refresh
824 the prev_pc value before calculating the line number. This approach
825 did not work because on platforms that use ptrace, the pc register
826 cannot be read unless the inferior is stopped. At that point, we
827 are not guaranteed the inferior is stopped and so the read_pc ()
828 call can fail. Setting the prev_pc value here ensures the value is
829 updated correctly when the inferior is stopped. */
830 prev_pc = read_pc ();
832 /* Resume inferior. */
833 resume (oneproc || step || bpstat_should_step (), stop_signal);
835 /* Wait for it to stop (if not standalone)
836 and in any case decode why it stopped, and act accordingly. */
837 /* Do this only if we are not using the event loop, or if the target
838 does not support asynchronous execution. */
839 if (!event_loop_p || !target_can_async_p ())
841 wait_for_inferior ();
847 /* Start remote-debugging of a machine over a serial link. */
853 init_wait_for_inferior ();
854 stop_soon = STOP_QUIETLY;
857 /* Always go on waiting for the target, regardless of the mode. */
858 /* FIXME: cagney/1999-09-23: At present it isn't possible to
859 indicate to wait_for_inferior that a target should timeout if
860 nothing is returned (instead of just blocking). Because of this,
861 targets expecting an immediate response need to, internally, set
862 things up so that the target_wait() is forced to eventually
864 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
865 differentiate to its caller what the state of the target is after
866 the initial open has been performed. Here we're assuming that
867 the target has stopped. It should be possible to eventually have
868 target_open() return to the caller an indication that the target
869 is currently running and GDB state should be set to the same as
871 wait_for_inferior ();
875 /* Initialize static vars when a new inferior begins. */
878 init_wait_for_inferior (void)
880 /* These are meaningless until the first time through wait_for_inferior. */
884 trap_expected_after_continue = 0;
886 breakpoints_inserted = 0;
887 breakpoint_init_inferior (inf_starting);
889 /* Don't confuse first call to proceed(). */
890 stop_signal = TARGET_SIGNAL_0;
892 /* The first resume is not following a fork/vfork/exec. */
893 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
895 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
896 number_of_threads_in_syscalls = 0;
898 clear_proceed_status ();
900 stepping_past_singlestep_breakpoint = 0;
903 /* This enum encodes possible reasons for doing a target_wait, so that
904 wfi can call target_wait in one place. (Ultimately the call will be
905 moved out of the infinite loop entirely.) */
909 infwait_normal_state,
910 infwait_thread_hop_state,
911 infwait_nullified_state,
912 infwait_nonstep_watch_state
915 /* Why did the inferior stop? Used to print the appropriate messages
916 to the interface from within handle_inferior_event(). */
917 enum inferior_stop_reason
919 /* We don't know why. */
921 /* Step, next, nexti, stepi finished. */
923 /* Found breakpoint. */
925 /* Inferior terminated by signal. */
927 /* Inferior exited. */
929 /* Inferior received signal, and user asked to be notified. */
933 /* This structure contains what used to be local variables in
934 wait_for_inferior. Probably many of them can return to being
935 locals in handle_inferior_event. */
937 struct execution_control_state
939 struct target_waitstatus ws;
940 struct target_waitstatus *wp;
943 CORE_ADDR stop_func_start;
944 CORE_ADDR stop_func_end;
945 char *stop_func_name;
946 struct symtab_and_line sal;
947 int remove_breakpoints_on_following_step;
949 struct symtab *current_symtab;
950 int handling_longjmp; /* FIXME */
952 ptid_t saved_inferior_ptid;
953 int stepping_through_solib_after_catch;
954 bpstat stepping_through_solib_catchpoints;
955 int enable_hw_watchpoints_after_wait;
956 int stepping_through_sigtramp;
957 int new_thread_event;
958 struct target_waitstatus tmpstatus;
959 enum infwait_states infwait_state;
964 void init_execution_control_state (struct execution_control_state *ecs);
966 void handle_inferior_event (struct execution_control_state *ecs);
968 static void step_into_function (struct execution_control_state *ecs);
969 static void insert_step_resume_breakpoint (struct frame_info *step_frame,
970 struct execution_control_state *ecs);
971 static void stop_stepping (struct execution_control_state *ecs);
972 static void prepare_to_wait (struct execution_control_state *ecs);
973 static void keep_going (struct execution_control_state *ecs);
974 static void print_stop_reason (enum inferior_stop_reason stop_reason,
977 /* Wait for control to return from inferior to debugger.
978 If inferior gets a signal, we may decide to start it up again
979 instead of returning. That is why there is a loop in this function.
980 When this function actually returns it means the inferior
981 should be left stopped and GDB should read more commands. */
984 wait_for_inferior (void)
986 struct cleanup *old_cleanups;
987 struct execution_control_state ecss;
988 struct execution_control_state *ecs;
990 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
991 &step_resume_breakpoint);
993 /* wfi still stays in a loop, so it's OK just to take the address of
994 a local to get the ecs pointer. */
997 /* Fill in with reasonable starting values. */
998 init_execution_control_state (ecs);
1000 /* We'll update this if & when we switch to a new thread. */
1001 previous_inferior_ptid = inferior_ptid;
1003 overlay_cache_invalid = 1;
1005 /* We have to invalidate the registers BEFORE calling target_wait
1006 because they can be loaded from the target while in target_wait.
1007 This makes remote debugging a bit more efficient for those
1008 targets that provide critical registers as part of their normal
1009 status mechanism. */
1011 registers_changed ();
1015 if (deprecated_target_wait_hook)
1016 ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
1018 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
1020 /* Now figure out what to do with the result of the result. */
1021 handle_inferior_event (ecs);
1023 if (!ecs->wait_some_more)
1026 do_cleanups (old_cleanups);
1029 /* Asynchronous version of wait_for_inferior. It is called by the
1030 event loop whenever a change of state is detected on the file
1031 descriptor corresponding to the target. It can be called more than
1032 once to complete a single execution command. In such cases we need
1033 to keep the state in a global variable ASYNC_ECSS. If it is the
1034 last time that this function is called for a single execution
1035 command, then report to the user that the inferior has stopped, and
1036 do the necessary cleanups. */
1038 struct execution_control_state async_ecss;
1039 struct execution_control_state *async_ecs;
1042 fetch_inferior_event (void *client_data)
1044 static struct cleanup *old_cleanups;
1046 async_ecs = &async_ecss;
1048 if (!async_ecs->wait_some_more)
1050 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1051 &step_resume_breakpoint);
1053 /* Fill in with reasonable starting values. */
1054 init_execution_control_state (async_ecs);
1056 /* We'll update this if & when we switch to a new thread. */
1057 previous_inferior_ptid = inferior_ptid;
1059 overlay_cache_invalid = 1;
1061 /* We have to invalidate the registers BEFORE calling target_wait
1062 because they can be loaded from the target while in target_wait.
1063 This makes remote debugging a bit more efficient for those
1064 targets that provide critical registers as part of their normal
1065 status mechanism. */
1067 registers_changed ();
1070 if (deprecated_target_wait_hook)
1072 deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1074 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1076 /* Now figure out what to do with the result of the result. */
1077 handle_inferior_event (async_ecs);
1079 if (!async_ecs->wait_some_more)
1081 /* Do only the cleanups that have been added by this
1082 function. Let the continuations for the commands do the rest,
1083 if there are any. */
1084 do_exec_cleanups (old_cleanups);
1086 if (step_multi && stop_step)
1087 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1089 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1093 /* Prepare an execution control state for looping through a
1094 wait_for_inferior-type loop. */
1097 init_execution_control_state (struct execution_control_state *ecs)
1099 /* ecs->another_trap? */
1100 ecs->random_signal = 0;
1101 ecs->remove_breakpoints_on_following_step = 0;
1102 ecs->handling_longjmp = 0; /* FIXME */
1103 ecs->stepping_through_solib_after_catch = 0;
1104 ecs->stepping_through_solib_catchpoints = NULL;
1105 ecs->enable_hw_watchpoints_after_wait = 0;
1106 ecs->stepping_through_sigtramp = 0;
1107 ecs->sal = find_pc_line (prev_pc, 0);
1108 ecs->current_line = ecs->sal.line;
1109 ecs->current_symtab = ecs->sal.symtab;
1110 ecs->infwait_state = infwait_normal_state;
1111 ecs->waiton_ptid = pid_to_ptid (-1);
1112 ecs->wp = &(ecs->ws);
1115 /* Call this function before setting step_resume_breakpoint, as a
1116 sanity check. There should never be more than one step-resume
1117 breakpoint per thread, so we should never be setting a new
1118 step_resume_breakpoint when one is already active. */
1120 check_for_old_step_resume_breakpoint (void)
1122 if (step_resume_breakpoint)
1124 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1127 /* Return the cached copy of the last pid/waitstatus returned by
1128 target_wait()/deprecated_target_wait_hook(). The data is actually
1129 cached by handle_inferior_event(), which gets called immediately
1130 after target_wait()/deprecated_target_wait_hook(). */
1133 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1135 *ptidp = target_last_wait_ptid;
1136 *status = target_last_waitstatus;
1139 /* Switch thread contexts, maintaining "infrun state". */
1142 context_switch (struct execution_control_state *ecs)
1144 /* Caution: it may happen that the new thread (or the old one!)
1145 is not in the thread list. In this case we must not attempt
1146 to "switch context", or we run the risk that our context may
1147 be lost. This may happen as a result of the target module
1148 mishandling thread creation. */
1150 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1151 { /* Perform infrun state context switch: */
1152 /* Save infrun state for the old thread. */
1153 save_infrun_state (inferior_ptid, prev_pc,
1154 trap_expected, step_resume_breakpoint,
1156 step_range_end, &step_frame_id,
1157 ecs->handling_longjmp, ecs->another_trap,
1158 ecs->stepping_through_solib_after_catch,
1159 ecs->stepping_through_solib_catchpoints,
1160 ecs->stepping_through_sigtramp,
1161 ecs->current_line, ecs->current_symtab);
1163 /* Load infrun state for the new thread. */
1164 load_infrun_state (ecs->ptid, &prev_pc,
1165 &trap_expected, &step_resume_breakpoint,
1167 &step_range_end, &step_frame_id,
1168 &ecs->handling_longjmp, &ecs->another_trap,
1169 &ecs->stepping_through_solib_after_catch,
1170 &ecs->stepping_through_solib_catchpoints,
1171 &ecs->stepping_through_sigtramp,
1172 &ecs->current_line, &ecs->current_symtab);
1174 inferior_ptid = ecs->ptid;
1178 adjust_pc_after_break (struct execution_control_state *ecs)
1180 CORE_ADDR breakpoint_pc;
1182 /* If this target does not decrement the PC after breakpoints, then
1183 we have nothing to do. */
1184 if (DECR_PC_AFTER_BREAK == 0)
1187 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1188 we aren't, just return.
1190 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1191 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1192 by software breakpoints should be handled through the normal breakpoint
1195 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1196 different signals (SIGILL or SIGEMT for instance), but it is less
1197 clear where the PC is pointing afterwards. It may not match
1198 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1199 these signals at breakpoints (the code has been in GDB since at least
1200 1992) so I can not guess how to handle them here.
1202 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1203 would have the PC after hitting a watchpoint affected by
1204 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1205 in GDB history, and it seems unlikely to be correct, so
1206 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1208 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1211 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1214 /* Find the location where (if we've hit a breakpoint) the
1215 breakpoint would be. */
1216 breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK;
1218 if (SOFTWARE_SINGLE_STEP_P ())
1220 /* When using software single-step, a SIGTRAP can only indicate
1221 an inserted breakpoint. This actually makes things
1223 if (singlestep_breakpoints_inserted_p)
1224 /* When software single stepping, the instruction at [prev_pc]
1225 is never a breakpoint, but the instruction following
1226 [prev_pc] (in program execution order) always is. Assume
1227 that following instruction was reached and hence a software
1228 breakpoint was hit. */
1229 write_pc_pid (breakpoint_pc, ecs->ptid);
1230 else if (software_breakpoint_inserted_here_p (breakpoint_pc))
1231 /* The inferior was free running (i.e., no single-step
1232 breakpoints inserted) and it hit a software breakpoint. */
1233 write_pc_pid (breakpoint_pc, ecs->ptid);
1237 /* When using hardware single-step, a SIGTRAP is reported for
1238 both a completed single-step and a software breakpoint. Need
1239 to differentiate between the two as the latter needs
1240 adjusting but the former does not. */
1241 if (currently_stepping (ecs))
1243 if (prev_pc == breakpoint_pc
1244 && software_breakpoint_inserted_here_p (breakpoint_pc))
1245 /* Hardware single-stepped a software breakpoint (as
1246 occures when the inferior is resumed with PC pointing
1247 at not-yet-hit software breakpoint). Since the
1248 breakpoint really is executed, the inferior needs to be
1249 backed up to the breakpoint address. */
1250 write_pc_pid (breakpoint_pc, ecs->ptid);
1254 if (software_breakpoint_inserted_here_p (breakpoint_pc))
1255 /* The inferior was free running (i.e., no hardware
1256 single-step and no possibility of a false SIGTRAP) and
1257 hit a software breakpoint. */
1258 write_pc_pid (breakpoint_pc, ecs->ptid);
1263 /* Given an execution control state that has been freshly filled in
1264 by an event from the inferior, figure out what it means and take
1265 appropriate action. */
1267 int stepped_after_stopped_by_watchpoint;
1270 handle_inferior_event (struct execution_control_state *ecs)
1272 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1273 thinking that the variable stepped_after_stopped_by_watchpoint
1274 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1275 defined in the file "config/pa/nm-hppah.h", accesses the variable
1276 indirectly. Mutter something rude about the HP merge. */
1277 int sw_single_step_trap_p = 0;
1278 int stopped_by_watchpoint = 0;
1280 /* Cache the last pid/waitstatus. */
1281 target_last_wait_ptid = ecs->ptid;
1282 target_last_waitstatus = *ecs->wp;
1284 adjust_pc_after_break (ecs);
1286 switch (ecs->infwait_state)
1288 case infwait_thread_hop_state:
1289 /* Cancel the waiton_ptid. */
1290 ecs->waiton_ptid = pid_to_ptid (-1);
1291 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1292 is serviced in this loop, below. */
1293 if (ecs->enable_hw_watchpoints_after_wait)
1295 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1296 ecs->enable_hw_watchpoints_after_wait = 0;
1298 stepped_after_stopped_by_watchpoint = 0;
1301 case infwait_normal_state:
1302 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1303 is serviced in this loop, below. */
1304 if (ecs->enable_hw_watchpoints_after_wait)
1306 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1307 ecs->enable_hw_watchpoints_after_wait = 0;
1309 stepped_after_stopped_by_watchpoint = 0;
1312 case infwait_nullified_state:
1313 stepped_after_stopped_by_watchpoint = 0;
1316 case infwait_nonstep_watch_state:
1317 insert_breakpoints ();
1319 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1320 handle things like signals arriving and other things happening
1321 in combination correctly? */
1322 stepped_after_stopped_by_watchpoint = 1;
1326 internal_error (__FILE__, __LINE__, "bad switch");
1328 ecs->infwait_state = infwait_normal_state;
1330 flush_cached_frames ();
1332 /* If it's a new process, add it to the thread database */
1334 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1335 && !ptid_equal (ecs->ptid, minus_one_ptid)
1336 && !in_thread_list (ecs->ptid));
1338 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1339 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1341 add_thread (ecs->ptid);
1343 ui_out_text (uiout, "[New ");
1344 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1345 ui_out_text (uiout, "]\n");
1348 /* NOTE: This block is ONLY meant to be invoked in case of a
1349 "thread creation event"! If it is invoked for any other
1350 sort of event (such as a new thread landing on a breakpoint),
1351 the event will be discarded, which is almost certainly
1354 To avoid this, the low-level module (eg. target_wait)
1355 should call in_thread_list and add_thread, so that the
1356 new thread is known by the time we get here. */
1358 /* We may want to consider not doing a resume here in order
1359 to give the user a chance to play with the new thread.
1360 It might be good to make that a user-settable option. */
1362 /* At this point, all threads are stopped (happens
1363 automatically in either the OS or the native code).
1364 Therefore we need to continue all threads in order to
1367 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1368 prepare_to_wait (ecs);
1373 switch (ecs->ws.kind)
1375 case TARGET_WAITKIND_LOADED:
1376 /* Ignore gracefully during startup of the inferior, as it
1377 might be the shell which has just loaded some objects,
1378 otherwise add the symbols for the newly loaded objects. */
1380 if (stop_soon == NO_STOP_QUIETLY)
1382 /* Remove breakpoints, SOLIB_ADD might adjust
1383 breakpoint addresses via breakpoint_re_set. */
1384 if (breakpoints_inserted)
1385 remove_breakpoints ();
1387 /* Check for any newly added shared libraries if we're
1388 supposed to be adding them automatically. Switch
1389 terminal for any messages produced by
1390 breakpoint_re_set. */
1391 target_terminal_ours_for_output ();
1392 /* NOTE: cagney/2003-11-25: Make certain that the target
1393 stack's section table is kept up-to-date. Architectures,
1394 (e.g., PPC64), use the section table to perform
1395 operations such as address => section name and hence
1396 require the table to contain all sections (including
1397 those found in shared libraries). */
1398 /* NOTE: cagney/2003-11-25: Pass current_target and not
1399 exec_ops to SOLIB_ADD. This is because current GDB is
1400 only tooled to propagate section_table changes out from
1401 the "current_target" (see target_resize_to_sections), and
1402 not up from the exec stratum. This, of course, isn't
1403 right. "infrun.c" should only interact with the
1404 exec/process stratum, instead relying on the target stack
1405 to propagate relevant changes (stop, section table
1406 changed, ...) up to other layers. */
1407 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1408 target_terminal_inferior ();
1410 /* Reinsert breakpoints and continue. */
1411 if (breakpoints_inserted)
1412 insert_breakpoints ();
1415 resume (0, TARGET_SIGNAL_0);
1416 prepare_to_wait (ecs);
1419 case TARGET_WAITKIND_SPURIOUS:
1420 resume (0, TARGET_SIGNAL_0);
1421 prepare_to_wait (ecs);
1424 case TARGET_WAITKIND_EXITED:
1425 target_terminal_ours (); /* Must do this before mourn anyway */
1426 print_stop_reason (EXITED, ecs->ws.value.integer);
1428 /* Record the exit code in the convenience variable $_exitcode, so
1429 that the user can inspect this again later. */
1430 set_internalvar (lookup_internalvar ("_exitcode"),
1431 value_from_longest (builtin_type_int,
1432 (LONGEST) ecs->ws.value.integer));
1433 gdb_flush (gdb_stdout);
1434 target_mourn_inferior ();
1435 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1436 stop_print_frame = 0;
1437 stop_stepping (ecs);
1440 case TARGET_WAITKIND_SIGNALLED:
1441 stop_print_frame = 0;
1442 stop_signal = ecs->ws.value.sig;
1443 target_terminal_ours (); /* Must do this before mourn anyway */
1445 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1446 reach here unless the inferior is dead. However, for years
1447 target_kill() was called here, which hints that fatal signals aren't
1448 really fatal on some systems. If that's true, then some changes
1450 target_mourn_inferior ();
1452 print_stop_reason (SIGNAL_EXITED, stop_signal);
1453 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1454 stop_stepping (ecs);
1457 /* The following are the only cases in which we keep going;
1458 the above cases end in a continue or goto. */
1459 case TARGET_WAITKIND_FORKED:
1460 case TARGET_WAITKIND_VFORKED:
1461 stop_signal = TARGET_SIGNAL_TRAP;
1462 pending_follow.kind = ecs->ws.kind;
1464 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1465 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1467 stop_pc = read_pc ();
1469 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1471 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1473 /* If no catchpoint triggered for this, then keep going. */
1474 if (ecs->random_signal)
1476 stop_signal = TARGET_SIGNAL_0;
1480 goto process_event_stop_test;
1482 case TARGET_WAITKIND_EXECD:
1483 stop_signal = TARGET_SIGNAL_TRAP;
1485 /* NOTE drow/2002-12-05: This code should be pushed down into the
1486 target_wait function. Until then following vfork on HP/UX 10.20
1487 is probably broken by this. Of course, it's broken anyway. */
1488 /* Is this a target which reports multiple exec events per actual
1489 call to exec()? (HP-UX using ptrace does, for example.) If so,
1490 ignore all but the last one. Just resume the exec'r, and wait
1491 for the next exec event. */
1492 if (inferior_ignoring_leading_exec_events)
1494 inferior_ignoring_leading_exec_events--;
1495 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1496 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1498 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1499 prepare_to_wait (ecs);
1502 inferior_ignoring_leading_exec_events =
1503 target_reported_exec_events_per_exec_call () - 1;
1505 pending_follow.execd_pathname =
1506 savestring (ecs->ws.value.execd_pathname,
1507 strlen (ecs->ws.value.execd_pathname));
1509 /* This causes the eventpoints and symbol table to be reset. Must
1510 do this now, before trying to determine whether to stop. */
1511 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1512 xfree (pending_follow.execd_pathname);
1514 stop_pc = read_pc_pid (ecs->ptid);
1515 ecs->saved_inferior_ptid = inferior_ptid;
1516 inferior_ptid = ecs->ptid;
1518 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
1520 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1521 inferior_ptid = ecs->saved_inferior_ptid;
1523 /* If no catchpoint triggered for this, then keep going. */
1524 if (ecs->random_signal)
1526 stop_signal = TARGET_SIGNAL_0;
1530 goto process_event_stop_test;
1532 /* These syscall events are returned on HP-UX, as part of its
1533 implementation of page-protection-based "hardware" watchpoints.
1534 HP-UX has unfortunate interactions between page-protections and
1535 some system calls. Our solution is to disable hardware watches
1536 when a system call is entered, and reenable them when the syscall
1537 completes. The downside of this is that we may miss the precise
1538 point at which a watched piece of memory is modified. "Oh well."
1540 Note that we may have multiple threads running, which may each
1541 enter syscalls at roughly the same time. Since we don't have a
1542 good notion currently of whether a watched piece of memory is
1543 thread-private, we'd best not have any page-protections active
1544 when any thread is in a syscall. Thus, we only want to reenable
1545 hardware watches when no threads are in a syscall.
1547 Also, be careful not to try to gather much state about a thread
1548 that's in a syscall. It's frequently a losing proposition. */
1549 case TARGET_WAITKIND_SYSCALL_ENTRY:
1550 number_of_threads_in_syscalls++;
1551 if (number_of_threads_in_syscalls == 1)
1553 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1555 resume (0, TARGET_SIGNAL_0);
1556 prepare_to_wait (ecs);
1559 /* Before examining the threads further, step this thread to
1560 get it entirely out of the syscall. (We get notice of the
1561 event when the thread is just on the verge of exiting a
1562 syscall. Stepping one instruction seems to get it back
1565 Note that although the logical place to reenable h/w watches
1566 is here, we cannot. We cannot reenable them before stepping
1567 the thread (this causes the next wait on the thread to hang).
1569 Nor can we enable them after stepping until we've done a wait.
1570 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1571 here, which will be serviced immediately after the target
1573 case TARGET_WAITKIND_SYSCALL_RETURN:
1574 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1576 if (number_of_threads_in_syscalls > 0)
1578 number_of_threads_in_syscalls--;
1579 ecs->enable_hw_watchpoints_after_wait =
1580 (number_of_threads_in_syscalls == 0);
1582 prepare_to_wait (ecs);
1585 case TARGET_WAITKIND_STOPPED:
1586 stop_signal = ecs->ws.value.sig;
1589 /* We had an event in the inferior, but we are not interested
1590 in handling it at this level. The lower layers have already
1591 done what needs to be done, if anything.
1593 One of the possible circumstances for this is when the
1594 inferior produces output for the console. The inferior has
1595 not stopped, and we are ignoring the event. Another possible
1596 circumstance is any event which the lower level knows will be
1597 reported multiple times without an intervening resume. */
1598 case TARGET_WAITKIND_IGNORE:
1599 prepare_to_wait (ecs);
1603 /* We may want to consider not doing a resume here in order to give
1604 the user a chance to play with the new thread. It might be good
1605 to make that a user-settable option. */
1607 /* At this point, all threads are stopped (happens automatically in
1608 either the OS or the native code). Therefore we need to continue
1609 all threads in order to make progress. */
1610 if (ecs->new_thread_event)
1612 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1613 prepare_to_wait (ecs);
1617 stop_pc = read_pc_pid (ecs->ptid);
1619 if (stepping_past_singlestep_breakpoint)
1621 gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p);
1622 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1623 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1625 stepping_past_singlestep_breakpoint = 0;
1627 /* We've either finished single-stepping past the single-step
1628 breakpoint, or stopped for some other reason. It would be nice if
1629 we could tell, but we can't reliably. */
1630 if (stop_signal == TARGET_SIGNAL_TRAP)
1632 /* Pull the single step breakpoints out of the target. */
1633 SOFTWARE_SINGLE_STEP (0, 0);
1634 singlestep_breakpoints_inserted_p = 0;
1636 ecs->random_signal = 0;
1638 ecs->ptid = saved_singlestep_ptid;
1639 context_switch (ecs);
1640 if (deprecated_context_hook)
1641 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1643 resume (1, TARGET_SIGNAL_0);
1644 prepare_to_wait (ecs);
1649 stepping_past_singlestep_breakpoint = 0;
1651 /* See if a thread hit a thread-specific breakpoint that was meant for
1652 another thread. If so, then step that thread past the breakpoint,
1655 if (stop_signal == TARGET_SIGNAL_TRAP)
1657 int thread_hop_needed = 0;
1659 /* Check if a regular breakpoint has been hit before checking
1660 for a potential single step breakpoint. Otherwise, GDB will
1661 not see this breakpoint hit when stepping onto breakpoints. */
1662 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1664 ecs->random_signal = 0;
1665 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1666 thread_hop_needed = 1;
1668 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1670 ecs->random_signal = 0;
1671 /* The call to in_thread_list is necessary because PTIDs sometimes
1672 change when we go from single-threaded to multi-threaded. If
1673 the singlestep_ptid is still in the list, assume that it is
1674 really different from ecs->ptid. */
1675 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1676 && in_thread_list (singlestep_ptid))
1678 thread_hop_needed = 1;
1679 stepping_past_singlestep_breakpoint = 1;
1680 saved_singlestep_ptid = singlestep_ptid;
1684 if (thread_hop_needed)
1688 /* Saw a breakpoint, but it was hit by the wrong thread.
1691 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1693 /* Pull the single step breakpoints out of the target. */
1694 SOFTWARE_SINGLE_STEP (0, 0);
1695 singlestep_breakpoints_inserted_p = 0;
1698 remove_status = remove_breakpoints ();
1699 /* Did we fail to remove breakpoints? If so, try
1700 to set the PC past the bp. (There's at least
1701 one situation in which we can fail to remove
1702 the bp's: On HP-UX's that use ttrace, we can't
1703 change the address space of a vforking child
1704 process until the child exits (well, okay, not
1705 then either :-) or execs. */
1706 if (remove_status != 0)
1708 /* FIXME! This is obviously non-portable! */
1709 write_pc_pid (stop_pc + 4, ecs->ptid);
1710 /* We need to restart all the threads now,
1711 * unles we're running in scheduler-locked mode.
1712 * Use currently_stepping to determine whether to
1715 /* FIXME MVS: is there any reason not to call resume()? */
1716 if (scheduler_mode == schedlock_on)
1717 target_resume (ecs->ptid,
1718 currently_stepping (ecs), TARGET_SIGNAL_0);
1720 target_resume (RESUME_ALL,
1721 currently_stepping (ecs), TARGET_SIGNAL_0);
1722 prepare_to_wait (ecs);
1727 breakpoints_inserted = 0;
1728 if (!ptid_equal (inferior_ptid, ecs->ptid))
1729 context_switch (ecs);
1730 ecs->waiton_ptid = ecs->ptid;
1731 ecs->wp = &(ecs->ws);
1732 ecs->another_trap = 1;
1734 ecs->infwait_state = infwait_thread_hop_state;
1736 registers_changed ();
1740 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1742 sw_single_step_trap_p = 1;
1743 ecs->random_signal = 0;
1747 ecs->random_signal = 1;
1749 /* See if something interesting happened to the non-current thread. If
1750 so, then switch to that thread. */
1751 if (!ptid_equal (ecs->ptid, inferior_ptid))
1753 context_switch (ecs);
1755 if (deprecated_context_hook)
1756 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1758 flush_cached_frames ();
1761 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1763 /* Pull the single step breakpoints out of the target. */
1764 SOFTWARE_SINGLE_STEP (0, 0);
1765 singlestep_breakpoints_inserted_p = 0;
1768 /* If PC is pointing at a nullified instruction, then step beyond
1769 it so that the user won't be confused when GDB appears to be ready
1772 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1773 if (INSTRUCTION_NULLIFIED)
1775 registers_changed ();
1776 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1778 /* We may have received a signal that we want to pass to
1779 the inferior; therefore, we must not clobber the waitstatus
1782 ecs->infwait_state = infwait_nullified_state;
1783 ecs->waiton_ptid = ecs->ptid;
1784 ecs->wp = &(ecs->tmpstatus);
1785 prepare_to_wait (ecs);
1789 /* It may not be necessary to disable the watchpoint to stop over
1790 it. For example, the PA can (with some kernel cooperation)
1791 single step over a watchpoint without disabling the watchpoint. */
1792 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1795 prepare_to_wait (ecs);
1799 /* It is far more common to need to disable a watchpoint to step
1800 the inferior over it. FIXME. What else might a debug
1801 register or page protection watchpoint scheme need here? */
1802 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1804 /* At this point, we are stopped at an instruction which has
1805 attempted to write to a piece of memory under control of
1806 a watchpoint. The instruction hasn't actually executed
1807 yet. If we were to evaluate the watchpoint expression
1808 now, we would get the old value, and therefore no change
1809 would seem to have occurred.
1811 In order to make watchpoints work `right', we really need
1812 to complete the memory write, and then evaluate the
1813 watchpoint expression. The following code does that by
1814 removing the watchpoint (actually, all watchpoints and
1815 breakpoints), single-stepping the target, re-inserting
1816 watchpoints, and then falling through to let normal
1817 single-step processing handle proceed. Since this
1818 includes evaluating watchpoints, things will come to a
1819 stop in the correct manner. */
1821 remove_breakpoints ();
1822 registers_changed ();
1823 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1825 ecs->waiton_ptid = ecs->ptid;
1826 ecs->wp = &(ecs->ws);
1827 ecs->infwait_state = infwait_nonstep_watch_state;
1828 prepare_to_wait (ecs);
1832 /* It may be possible to simply continue after a watchpoint. */
1833 if (HAVE_CONTINUABLE_WATCHPOINT)
1834 stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws);
1836 ecs->stop_func_start = 0;
1837 ecs->stop_func_end = 0;
1838 ecs->stop_func_name = 0;
1839 /* Don't care about return value; stop_func_start and stop_func_name
1840 will both be 0 if it doesn't work. */
1841 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1842 &ecs->stop_func_start, &ecs->stop_func_end);
1843 ecs->stop_func_start += FUNCTION_START_OFFSET;
1844 ecs->another_trap = 0;
1845 bpstat_clear (&stop_bpstat);
1847 stop_stack_dummy = 0;
1848 stop_print_frame = 1;
1849 ecs->random_signal = 0;
1850 stopped_by_random_signal = 0;
1851 breakpoints_failed = 0;
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
1878 || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1880 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1882 stop_print_frame = 0;
1883 stop_stepping (ecs);
1887 /* This is originated from start_remote(), start_inferior() and
1888 shared libraries hook functions. */
1889 if (stop_soon == STOP_QUIETLY)
1891 stop_stepping (ecs);
1895 /* This originates from attach_command(). We need to overwrite
1896 the stop_signal here, because some kernels don't ignore a
1897 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1898 See more comments in inferior.h. */
1899 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1901 stop_stepping (ecs);
1902 if (stop_signal == TARGET_SIGNAL_STOP)
1903 stop_signal = TARGET_SIGNAL_0;
1907 /* Don't even think about breakpoints if just proceeded over a
1909 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1910 bpstat_clear (&stop_bpstat);
1913 /* See if there is a breakpoint at the current PC. */
1914 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid,
1915 stopped_by_watchpoint);
1917 /* Following in case break condition called a
1919 stop_print_frame = 1;
1922 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1923 at one stage in the past included checks for an inferior
1924 function call's call dummy's return breakpoint. The original
1925 comment, that went with the test, read:
1927 ``End of a stack dummy. Some systems (e.g. Sony news) give
1928 another signal besides SIGTRAP, so check here as well as
1931 If someone ever tries to get get call dummys on a
1932 non-executable stack to work (where the target would stop
1933 with something like a SIGSEGV), then those tests might need
1934 to be re-instated. Given, however, that the tests were only
1935 enabled when momentary breakpoints were not being used, I
1936 suspect that it won't be the case.
1938 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
1939 be necessary for call dummies on a non-executable stack on
1942 if (stop_signal == TARGET_SIGNAL_TRAP)
1944 = !(bpstat_explains_signal (stop_bpstat)
1946 || (step_range_end && step_resume_breakpoint == NULL));
1949 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1950 if (!ecs->random_signal)
1951 stop_signal = TARGET_SIGNAL_TRAP;
1955 /* When we reach this point, we've pretty much decided
1956 that the reason for stopping must've been a random
1957 (unexpected) signal. */
1960 ecs->random_signal = 1;
1962 process_event_stop_test:
1963 /* For the program's own signals, act according to
1964 the signal handling tables. */
1966 if (ecs->random_signal)
1968 /* Signal not for debugging purposes. */
1971 stopped_by_random_signal = 1;
1973 if (signal_print[stop_signal])
1976 target_terminal_ours_for_output ();
1977 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
1979 if (signal_stop[stop_signal])
1981 stop_stepping (ecs);
1984 /* If not going to stop, give terminal back
1985 if we took it away. */
1987 target_terminal_inferior ();
1989 /* Clear the signal if it should not be passed. */
1990 if (signal_program[stop_signal] == 0)
1991 stop_signal = TARGET_SIGNAL_0;
1993 if (step_range_end != 0
1994 && stop_signal != TARGET_SIGNAL_0
1995 && stop_pc >= step_range_start && stop_pc < step_range_end
1996 && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id))
1998 /* The inferior is about to take a signal that will take it
1999 out of the single step range. Set a breakpoint at the
2000 current PC (which is presumably where the signal handler
2001 will eventually return) and then allow the inferior to
2004 Note that this is only needed for a signal delivered
2005 while in the single-step range. Nested signals aren't a
2006 problem as they eventually all return. */
2007 insert_step_resume_breakpoint (get_current_frame (), ecs);
2013 /* Handle cases caused by hitting a breakpoint. */
2015 CORE_ADDR jmp_buf_pc;
2016 struct bpstat_what what;
2018 what = bpstat_what (stop_bpstat);
2020 if (what.call_dummy)
2022 stop_stack_dummy = 1;
2024 trap_expected_after_continue = 1;
2028 switch (what.main_action)
2030 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2031 /* If we hit the breakpoint at longjmp, disable it for the
2032 duration of this command. Then, install a temporary
2033 breakpoint at the target of the jmp_buf. */
2034 disable_longjmp_breakpoint ();
2035 remove_breakpoints ();
2036 breakpoints_inserted = 0;
2037 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
2043 /* Need to blow away step-resume breakpoint, as it
2044 interferes with us */
2045 if (step_resume_breakpoint != NULL)
2047 delete_step_resume_breakpoint (&step_resume_breakpoint);
2051 /* FIXME - Need to implement nested temporary breakpoints */
2052 if (step_over_calls > 0)
2053 set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ());
2056 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2057 ecs->handling_longjmp = 1; /* FIXME */
2061 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2062 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2063 remove_breakpoints ();
2064 breakpoints_inserted = 0;
2066 /* FIXME - Need to implement nested temporary breakpoints */
2068 && (frame_id_inner (get_frame_id (get_current_frame ()),
2071 ecs->another_trap = 1;
2076 disable_longjmp_breakpoint ();
2077 ecs->handling_longjmp = 0; /* FIXME */
2078 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2080 /* else fallthrough */
2082 case BPSTAT_WHAT_SINGLE:
2083 if (breakpoints_inserted)
2085 remove_breakpoints ();
2087 breakpoints_inserted = 0;
2088 ecs->another_trap = 1;
2089 /* Still need to check other stuff, at least the case
2090 where we are stepping and step out of the right range. */
2093 case BPSTAT_WHAT_STOP_NOISY:
2094 stop_print_frame = 1;
2096 /* We are about to nuke the step_resume_breakpointt via the
2097 cleanup chain, so no need to worry about it here. */
2099 stop_stepping (ecs);
2102 case BPSTAT_WHAT_STOP_SILENT:
2103 stop_print_frame = 0;
2105 /* We are about to nuke the step_resume_breakpoin via the
2106 cleanup chain, so no need to worry about it here. */
2108 stop_stepping (ecs);
2111 case BPSTAT_WHAT_STEP_RESUME:
2112 /* This proably demands a more elegant solution, but, yeah
2115 This function's use of the simple variable
2116 step_resume_breakpoint doesn't seem to accomodate
2117 simultaneously active step-resume bp's, although the
2118 breakpoint list certainly can.
2120 If we reach here and step_resume_breakpoint is already
2121 NULL, then apparently we have multiple active
2122 step-resume bp's. We'll just delete the breakpoint we
2123 stopped at, and carry on.
2125 Correction: what the code currently does is delete a
2126 step-resume bp, but it makes no effort to ensure that
2127 the one deleted is the one currently stopped at. MVS */
2129 if (step_resume_breakpoint == NULL)
2131 step_resume_breakpoint =
2132 bpstat_find_step_resume_breakpoint (stop_bpstat);
2134 delete_step_resume_breakpoint (&step_resume_breakpoint);
2137 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2138 /* If were waiting for a trap, hitting the step_resume_break
2139 doesn't count as getting it. */
2141 ecs->another_trap = 1;
2144 case BPSTAT_WHAT_CHECK_SHLIBS:
2145 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2148 /* Remove breakpoints, we eventually want to step over the
2149 shlib event breakpoint, and SOLIB_ADD might adjust
2150 breakpoint addresses via breakpoint_re_set. */
2151 if (breakpoints_inserted)
2152 remove_breakpoints ();
2153 breakpoints_inserted = 0;
2155 /* Check for any newly added shared libraries if we're
2156 supposed to be adding them automatically. Switch
2157 terminal for any messages produced by
2158 breakpoint_re_set. */
2159 target_terminal_ours_for_output ();
2160 /* NOTE: cagney/2003-11-25: Make certain that the target
2161 stack's section table is kept up-to-date. Architectures,
2162 (e.g., PPC64), use the section table to perform
2163 operations such as address => section name and hence
2164 require the table to contain all sections (including
2165 those found in shared libraries). */
2166 /* NOTE: cagney/2003-11-25: Pass current_target and not
2167 exec_ops to SOLIB_ADD. This is because current GDB is
2168 only tooled to propagate section_table changes out from
2169 the "current_target" (see target_resize_to_sections), and
2170 not up from the exec stratum. This, of course, isn't
2171 right. "infrun.c" should only interact with the
2172 exec/process stratum, instead relying on the target stack
2173 to propagate relevant changes (stop, section table
2174 changed, ...) up to other layers. */
2175 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2176 target_terminal_inferior ();
2178 /* Try to reenable shared library breakpoints, additional
2179 code segments in shared libraries might be mapped in now. */
2180 re_enable_breakpoints_in_shlibs ();
2182 /* If requested, stop when the dynamic linker notifies
2183 gdb of events. This allows the user to get control
2184 and place breakpoints in initializer routines for
2185 dynamically loaded objects (among other things). */
2186 if (stop_on_solib_events || stop_stack_dummy)
2188 stop_stepping (ecs);
2192 /* If we stopped due to an explicit catchpoint, then the
2193 (see above) call to SOLIB_ADD pulled in any symbols
2194 from a newly-loaded library, if appropriate.
2196 We do want the inferior to stop, but not where it is
2197 now, which is in the dynamic linker callback. Rather,
2198 we would like it stop in the user's program, just after
2199 the call that caused this catchpoint to trigger. That
2200 gives the user a more useful vantage from which to
2201 examine their program's state. */
2202 else if (what.main_action ==
2203 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2205 /* ??rehrauer: If I could figure out how to get the
2206 right return PC from here, we could just set a temp
2207 breakpoint and resume. I'm not sure we can without
2208 cracking open the dld's shared libraries and sniffing
2209 their unwind tables and text/data ranges, and that's
2210 not a terribly portable notion.
2212 Until that time, we must step the inferior out of the
2213 dld callback, and also out of the dld itself (and any
2214 code or stubs in libdld.sl, such as "shl_load" and
2215 friends) until we reach non-dld code. At that point,
2216 we can stop stepping. */
2217 bpstat_get_triggered_catchpoints (stop_bpstat,
2219 stepping_through_solib_catchpoints);
2220 ecs->stepping_through_solib_after_catch = 1;
2222 /* Be sure to lift all breakpoints, so the inferior does
2223 actually step past this point... */
2224 ecs->another_trap = 1;
2229 /* We want to step over this breakpoint, then keep going. */
2230 ecs->another_trap = 1;
2237 case BPSTAT_WHAT_LAST:
2238 /* Not a real code, but listed here to shut up gcc -Wall. */
2240 case BPSTAT_WHAT_KEEP_CHECKING:
2245 /* We come here if we hit a breakpoint but should not
2246 stop for it. Possibly we also were stepping
2247 and should stop for that. So fall through and
2248 test for stepping. But, if not stepping,
2251 /* Are we stepping to get the inferior out of the dynamic
2252 linker's hook (and possibly the dld itself) after catching
2254 if (ecs->stepping_through_solib_after_catch)
2256 #if defined(SOLIB_ADD)
2257 /* Have we reached our destination? If not, keep going. */
2258 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2260 ecs->another_trap = 1;
2265 /* Else, stop and report the catchpoint(s) whose triggering
2266 caused us to begin stepping. */
2267 ecs->stepping_through_solib_after_catch = 0;
2268 bpstat_clear (&stop_bpstat);
2269 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2270 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2271 stop_print_frame = 1;
2272 stop_stepping (ecs);
2276 if (step_resume_breakpoint)
2278 /* Having a step-resume breakpoint overrides anything
2279 else having to do with stepping commands until
2280 that breakpoint is reached. */
2285 if (step_range_end == 0)
2287 /* Likewise if we aren't even stepping. */
2292 /* If stepping through a line, keep going if still within it.
2294 Note that step_range_end is the address of the first instruction
2295 beyond the step range, and NOT the address of the last instruction
2297 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2303 /* We stepped out of the stepping range. */
2305 /* If we are stepping at the source level and entered the runtime
2306 loader dynamic symbol resolution code, we keep on single stepping
2307 until we exit the run time loader code and reach the callee's
2309 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2310 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2312 CORE_ADDR pc_after_resolver =
2313 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2315 if (pc_after_resolver)
2317 /* Set up a step-resume breakpoint at the address
2318 indicated by SKIP_SOLIB_RESOLVER. */
2319 struct symtab_and_line sr_sal;
2321 sr_sal.pc = pc_after_resolver;
2323 check_for_old_step_resume_breakpoint ();
2324 step_resume_breakpoint =
2325 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2326 if (breakpoints_inserted)
2327 insert_breakpoints ();
2334 if (step_range_end != 1
2335 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2336 || step_over_calls == STEP_OVER_ALL)
2337 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2339 /* The inferior, while doing a "step" or "next", has ended up in
2340 a signal trampoline (either by a signal being delivered or by
2341 the signal handler returning). Just single-step until the
2342 inferior leaves the trampoline (either by calling the handler
2348 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2349 && ecs->stop_func_name == NULL)
2351 /* The inferior just stepped into, or returned to, an
2352 undebuggable function (where there is no symbol, not even a
2353 minimal symbol, corresponding to the address where the
2354 inferior stopped). Since we want to skip this kind of code,
2355 we keep going until the inferior returns from this
2357 if (step_stop_if_no_debug)
2359 /* If we have no line number and the step-stop-if-no-debug
2360 is set, we stop the step so that the user has a chance to
2361 switch in assembly mode. */
2363 print_stop_reason (END_STEPPING_RANGE, 0);
2364 stop_stepping (ecs);
2369 /* Set a breakpoint at callee's return address (the address
2370 at which the caller will resume). */
2371 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()),
2378 if (frame_id_eq (frame_unwind_id (get_current_frame ()),
2381 /* It's a subroutine call. */
2382 CORE_ADDR real_stop_pc;
2384 if ((step_over_calls == STEP_OVER_NONE)
2385 || ((step_range_end == 1)
2386 && in_prologue (prev_pc, ecs->stop_func_start)))
2388 /* I presume that step_over_calls is only 0 when we're
2389 supposed to be stepping at the assembly language level
2390 ("stepi"). Just stop. */
2391 /* Also, maybe we just did a "nexti" inside a prolog, so we
2392 thought it was a subroutine call but it was not. Stop as
2395 print_stop_reason (END_STEPPING_RANGE, 0);
2396 stop_stepping (ecs);
2400 if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc))
2402 /* We're doing a "next", set a breakpoint at callee's return
2403 address (the address at which the caller will
2405 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()),
2411 /* If we are in a function call trampoline (a stub between the
2412 calling routine and the real function), locate the real
2413 function. That's what tells us (a) whether we want to step
2414 into it at all, and (b) what prologue we want to run to the
2415 end of, if we do step into it. */
2416 real_stop_pc = skip_language_trampoline (stop_pc);
2417 if (real_stop_pc == 0)
2418 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2419 if (real_stop_pc != 0)
2420 ecs->stop_func_start = real_stop_pc;
2422 /* If we have line number information for the function we are
2423 thinking of stepping into, step into it.
2425 If there are several symtabs at that PC (e.g. with include
2426 files), just want to know whether *any* of them have line
2427 numbers. find_pc_line handles this. */
2429 struct symtab_and_line tmp_sal;
2431 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2432 if (tmp_sal.line != 0)
2434 step_into_function (ecs);
2439 /* If we have no line number and the step-stop-if-no-debug is
2440 set, we stop the step so that the user has a chance to switch
2441 in assembly mode. */
2442 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2445 print_stop_reason (END_STEPPING_RANGE, 0);
2446 stop_stepping (ecs);
2450 /* Set a breakpoint at callee's return address (the address at
2451 which the caller will resume). */
2452 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), ecs);
2457 /* We've wandered out of the step range. */
2459 ecs->sal = find_pc_line (stop_pc, 0);
2461 if (step_range_end == 1)
2463 /* It is stepi or nexti. We always want to stop stepping after
2466 print_stop_reason (END_STEPPING_RANGE, 0);
2467 stop_stepping (ecs);
2471 /* If we're in the return path from a shared library trampoline,
2472 we want to proceed through the trampoline when stepping. */
2473 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2475 /* Determine where this trampoline returns. */
2476 CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2478 /* Only proceed through if we know where it's going. */
2481 /* And put the step-breakpoint there and go until there. */
2482 struct symtab_and_line sr_sal;
2484 init_sal (&sr_sal); /* initialize to zeroes */
2485 sr_sal.pc = real_stop_pc;
2486 sr_sal.section = find_pc_overlay (sr_sal.pc);
2487 /* Do not specify what the fp should be when we stop
2488 since on some machines the prologue
2489 is where the new fp value is established. */
2490 check_for_old_step_resume_breakpoint ();
2491 step_resume_breakpoint =
2492 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2493 if (breakpoints_inserted)
2494 insert_breakpoints ();
2496 /* Restart without fiddling with the step ranges or
2503 if (ecs->sal.line == 0)
2505 /* We have no line number information. That means to stop
2506 stepping (does this always happen right after one instruction,
2507 when we do "s" in a function with no line numbers,
2508 or can this happen as a result of a return or longjmp?). */
2510 print_stop_reason (END_STEPPING_RANGE, 0);
2511 stop_stepping (ecs);
2515 if ((stop_pc == ecs->sal.pc)
2516 && (ecs->current_line != ecs->sal.line
2517 || ecs->current_symtab != ecs->sal.symtab))
2519 /* We are at the start of a different line. So stop. Note that
2520 we don't stop if we step into the middle of a different line.
2521 That is said to make things like for (;;) statements work
2524 print_stop_reason (END_STEPPING_RANGE, 0);
2525 stop_stepping (ecs);
2529 /* We aren't done stepping.
2531 Optimize by setting the stepping range to the line.
2532 (We might not be in the original line, but if we entered a
2533 new line in mid-statement, we continue stepping. This makes
2534 things like for(;;) statements work better.) */
2536 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2538 /* If this is the last line of the function, don't keep stepping
2539 (it would probably step us out of the function).
2540 This is particularly necessary for a one-line function,
2541 in which after skipping the prologue we better stop even though
2542 we will be in mid-line. */
2544 print_stop_reason (END_STEPPING_RANGE, 0);
2545 stop_stepping (ecs);
2548 step_range_start = ecs->sal.pc;
2549 step_range_end = ecs->sal.end;
2550 step_frame_id = get_frame_id (get_current_frame ());
2551 ecs->current_line = ecs->sal.line;
2552 ecs->current_symtab = ecs->sal.symtab;
2554 /* In the case where we just stepped out of a function into the
2555 middle of a line of the caller, continue stepping, but
2556 step_frame_id must be modified to current frame */
2558 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2559 generous. It will trigger on things like a step into a frameless
2560 stackless leaf function. I think the logic should instead look
2561 at the unwound frame ID has that should give a more robust
2562 indication of what happened. */
2563 if (step-ID == current-ID)
2564 still stepping in same function;
2565 else if (step-ID == unwind (current-ID))
2566 stepped into a function;
2568 stepped out of a function;
2569 /* Of course this assumes that the frame ID unwind code is robust
2570 and we're willing to introduce frame unwind logic into this
2571 function. Fortunately, those days are nearly upon us. */
2574 struct frame_id current_frame = get_frame_id (get_current_frame ());
2575 if (!(frame_id_inner (current_frame, step_frame_id)))
2576 step_frame_id = current_frame;
2582 /* Are we in the middle of stepping? */
2585 currently_stepping (struct execution_control_state *ecs)
2587 return ((!ecs->handling_longjmp
2588 && ((step_range_end && step_resume_breakpoint == NULL)
2590 || ecs->stepping_through_solib_after_catch
2591 || bpstat_should_step ());
2594 /* Subroutine call with source code we should not step over. Do step
2595 to the first line of code in it. */
2598 step_into_function (struct execution_control_state *ecs)
2601 struct symtab_and_line sr_sal;
2603 s = find_pc_symtab (stop_pc);
2604 if (s && s->language != language_asm)
2605 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2607 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2608 /* Use the step_resume_break to step until the end of the prologue,
2609 even if that involves jumps (as it seems to on the vax under
2611 /* If the prologue ends in the middle of a source line, continue to
2612 the end of that source line (if it is still within the function).
2613 Otherwise, just go to end of prologue. */
2615 && ecs->sal.pc != ecs->stop_func_start
2616 && ecs->sal.end < ecs->stop_func_end)
2617 ecs->stop_func_start = ecs->sal.end;
2619 /* Architectures which require breakpoint adjustment might not be able
2620 to place a breakpoint at the computed address. If so, the test
2621 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2622 ecs->stop_func_start to an address at which a breakpoint may be
2623 legitimately placed.
2625 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2626 made, GDB will enter an infinite loop when stepping through
2627 optimized code consisting of VLIW instructions which contain
2628 subinstructions corresponding to different source lines. On
2629 FR-V, it's not permitted to place a breakpoint on any but the
2630 first subinstruction of a VLIW instruction. When a breakpoint is
2631 set, GDB will adjust the breakpoint address to the beginning of
2632 the VLIW instruction. Thus, we need to make the corresponding
2633 adjustment here when computing the stop address. */
2635 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2637 ecs->stop_func_start
2638 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2639 ecs->stop_func_start);
2642 if (ecs->stop_func_start == stop_pc)
2644 /* We are already there: stop now. */
2646 print_stop_reason (END_STEPPING_RANGE, 0);
2647 stop_stepping (ecs);
2652 /* Put the step-breakpoint there and go until there. */
2653 init_sal (&sr_sal); /* initialize to zeroes */
2654 sr_sal.pc = ecs->stop_func_start;
2655 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2656 /* Do not specify what the fp should be when we stop since on
2657 some machines the prologue is where the new fp value is
2659 check_for_old_step_resume_breakpoint ();
2660 step_resume_breakpoint =
2661 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2662 if (breakpoints_inserted)
2663 insert_breakpoints ();
2665 /* And make sure stepping stops right away then. */
2666 step_range_end = step_range_start;
2671 /* The inferior, as a result of a function call (has left) or signal
2672 (about to leave) the single-step range. Set a momentary breakpoint
2673 within the step range where the inferior is expected to later
2677 insert_step_resume_breakpoint (struct frame_info *step_frame,
2678 struct execution_control_state *ecs)
2680 struct symtab_and_line sr_sal;
2682 /* This is only used within the step-resume range/frame. */
2683 gdb_assert (frame_id_eq (step_frame_id, get_frame_id (step_frame)));
2684 gdb_assert (step_range_end != 0);
2685 /* Remember, if the call instruction is the last in the step range,
2686 the breakpoint will land just beyond that. Hence ``<=
2687 step_range_end''. Also, ignore check when "nexti". */
2688 gdb_assert (step_range_start == step_range_end
2689 || (get_frame_pc (step_frame) >= step_range_start
2690 && get_frame_pc (step_frame) <= step_range_end));
2692 init_sal (&sr_sal); /* initialize to zeros */
2694 sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (step_frame));
2695 sr_sal.section = find_pc_overlay (sr_sal.pc);
2697 check_for_old_step_resume_breakpoint ();
2699 step_resume_breakpoint
2700 = set_momentary_breakpoint (sr_sal, get_frame_id (step_frame),
2703 if (breakpoints_inserted)
2704 insert_breakpoints ();
2708 stop_stepping (struct execution_control_state *ecs)
2710 /* Let callers know we don't want to wait for the inferior anymore. */
2711 ecs->wait_some_more = 0;
2714 /* This function handles various cases where we need to continue
2715 waiting for the inferior. */
2716 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2719 keep_going (struct execution_control_state *ecs)
2721 /* Save the pc before execution, to compare with pc after stop. */
2722 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2724 /* If we did not do break;, it means we should keep running the
2725 inferior and not return to debugger. */
2727 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2729 /* We took a signal (which we are supposed to pass through to
2730 the inferior, else we'd have done a break above) and we
2731 haven't yet gotten our trap. Simply continue. */
2732 resume (currently_stepping (ecs), stop_signal);
2736 /* Either the trap was not expected, but we are continuing
2737 anyway (the user asked that this signal be passed to the
2740 The signal was SIGTRAP, e.g. it was our signal, but we
2741 decided we should resume from it.
2743 We're going to run this baby now!
2745 Insert breakpoints now, unless we are trying to one-proceed
2746 past a breakpoint. */
2747 /* If we've just finished a special step resume and we don't
2748 want to hit a breakpoint, pull em out. */
2749 if (step_resume_breakpoint == NULL
2750 && ecs->remove_breakpoints_on_following_step)
2752 ecs->remove_breakpoints_on_following_step = 0;
2753 remove_breakpoints ();
2754 breakpoints_inserted = 0;
2756 else if (!breakpoints_inserted && !ecs->another_trap)
2758 breakpoints_failed = insert_breakpoints ();
2759 if (breakpoints_failed)
2761 stop_stepping (ecs);
2764 breakpoints_inserted = 1;
2767 trap_expected = ecs->another_trap;
2769 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2770 specifies that such a signal should be delivered to the
2773 Typically, this would occure when a user is debugging a
2774 target monitor on a simulator: the target monitor sets a
2775 breakpoint; the simulator encounters this break-point and
2776 halts the simulation handing control to GDB; GDB, noteing
2777 that the break-point isn't valid, returns control back to the
2778 simulator; the simulator then delivers the hardware
2779 equivalent of a SIGNAL_TRAP to the program being debugged. */
2781 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2782 stop_signal = TARGET_SIGNAL_0;
2785 resume (currently_stepping (ecs), stop_signal);
2788 prepare_to_wait (ecs);
2791 /* This function normally comes after a resume, before
2792 handle_inferior_event exits. It takes care of any last bits of
2793 housekeeping, and sets the all-important wait_some_more flag. */
2796 prepare_to_wait (struct execution_control_state *ecs)
2798 if (ecs->infwait_state == infwait_normal_state)
2800 overlay_cache_invalid = 1;
2802 /* We have to invalidate the registers BEFORE calling
2803 target_wait because they can be loaded from the target while
2804 in target_wait. This makes remote debugging a bit more
2805 efficient for those targets that provide critical registers
2806 as part of their normal status mechanism. */
2808 registers_changed ();
2809 ecs->waiton_ptid = pid_to_ptid (-1);
2810 ecs->wp = &(ecs->ws);
2812 /* This is the old end of the while loop. Let everybody know we
2813 want to wait for the inferior some more and get called again
2815 ecs->wait_some_more = 1;
2818 /* Print why the inferior has stopped. We always print something when
2819 the inferior exits, or receives a signal. The rest of the cases are
2820 dealt with later on in normal_stop() and print_it_typical(). Ideally
2821 there should be a call to this function from handle_inferior_event()
2822 each time stop_stepping() is called.*/
2824 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2826 switch (stop_reason)
2829 /* We don't deal with these cases from handle_inferior_event()
2832 case END_STEPPING_RANGE:
2833 /* We are done with a step/next/si/ni command. */
2834 /* For now print nothing. */
2835 /* Print a message only if not in the middle of doing a "step n"
2836 operation for n > 1 */
2837 if (!step_multi || !stop_step)
2838 if (ui_out_is_mi_like_p (uiout))
2839 ui_out_field_string (uiout, "reason", "end-stepping-range");
2841 case BREAKPOINT_HIT:
2842 /* We found a breakpoint. */
2843 /* For now print nothing. */
2846 /* The inferior was terminated by a signal. */
2847 annotate_signalled ();
2848 if (ui_out_is_mi_like_p (uiout))
2849 ui_out_field_string (uiout, "reason", "exited-signalled");
2850 ui_out_text (uiout, "\nProgram terminated with signal ");
2851 annotate_signal_name ();
2852 ui_out_field_string (uiout, "signal-name",
2853 target_signal_to_name (stop_info));
2854 annotate_signal_name_end ();
2855 ui_out_text (uiout, ", ");
2856 annotate_signal_string ();
2857 ui_out_field_string (uiout, "signal-meaning",
2858 target_signal_to_string (stop_info));
2859 annotate_signal_string_end ();
2860 ui_out_text (uiout, ".\n");
2861 ui_out_text (uiout, "The program no longer exists.\n");
2864 /* The inferior program is finished. */
2865 annotate_exited (stop_info);
2868 if (ui_out_is_mi_like_p (uiout))
2869 ui_out_field_string (uiout, "reason", "exited");
2870 ui_out_text (uiout, "\nProgram exited with code ");
2871 ui_out_field_fmt (uiout, "exit-code", "0%o",
2872 (unsigned int) stop_info);
2873 ui_out_text (uiout, ".\n");
2877 if (ui_out_is_mi_like_p (uiout))
2878 ui_out_field_string (uiout, "reason", "exited-normally");
2879 ui_out_text (uiout, "\nProgram exited normally.\n");
2882 case SIGNAL_RECEIVED:
2883 /* Signal received. The signal table tells us to print about
2886 ui_out_text (uiout, "\nProgram received signal ");
2887 annotate_signal_name ();
2888 if (ui_out_is_mi_like_p (uiout))
2889 ui_out_field_string (uiout, "reason", "signal-received");
2890 ui_out_field_string (uiout, "signal-name",
2891 target_signal_to_name (stop_info));
2892 annotate_signal_name_end ();
2893 ui_out_text (uiout, ", ");
2894 annotate_signal_string ();
2895 ui_out_field_string (uiout, "signal-meaning",
2896 target_signal_to_string (stop_info));
2897 annotate_signal_string_end ();
2898 ui_out_text (uiout, ".\n");
2901 internal_error (__FILE__, __LINE__,
2902 "print_stop_reason: unrecognized enum value");
2908 /* Here to return control to GDB when the inferior stops for real.
2909 Print appropriate messages, remove breakpoints, give terminal our modes.
2911 STOP_PRINT_FRAME nonzero means print the executing frame
2912 (pc, function, args, file, line number and line text).
2913 BREAKPOINTS_FAILED nonzero means stop was due to error
2914 attempting to insert breakpoints. */
2919 struct target_waitstatus last;
2922 get_last_target_status (&last_ptid, &last);
2924 /* As with the notification of thread events, we want to delay
2925 notifying the user that we've switched thread context until
2926 the inferior actually stops.
2928 There's no point in saying anything if the inferior has exited.
2929 Note that SIGNALLED here means "exited with a signal", not
2930 "received a signal". */
2931 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
2932 && target_has_execution
2933 && last.kind != TARGET_WAITKIND_SIGNALLED
2934 && last.kind != TARGET_WAITKIND_EXITED)
2936 target_terminal_ours_for_output ();
2937 printf_filtered ("[Switching to %s]\n",
2938 target_pid_or_tid_to_str (inferior_ptid));
2939 previous_inferior_ptid = inferior_ptid;
2942 /* NOTE drow/2004-01-17: Is this still necessary? */
2943 /* Make sure that the current_frame's pc is correct. This
2944 is a correction for setting up the frame info before doing
2945 DECR_PC_AFTER_BREAK */
2946 if (target_has_execution)
2947 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2948 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2949 frame code to check for this and sort out any resultant mess.
2950 DECR_PC_AFTER_BREAK needs to just go away. */
2951 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2953 if (target_has_execution && breakpoints_inserted)
2955 if (remove_breakpoints ())
2957 target_terminal_ours_for_output ();
2958 printf_filtered ("Cannot remove breakpoints because ");
2959 printf_filtered ("program is no longer writable.\n");
2960 printf_filtered ("It might be running in another process.\n");
2961 printf_filtered ("Further execution is probably impossible.\n");
2964 breakpoints_inserted = 0;
2966 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2967 Delete any breakpoint that is to be deleted at the next stop. */
2969 breakpoint_auto_delete (stop_bpstat);
2971 /* If an auto-display called a function and that got a signal,
2972 delete that auto-display to avoid an infinite recursion. */
2974 if (stopped_by_random_signal)
2975 disable_current_display ();
2977 /* Don't print a message if in the middle of doing a "step n"
2978 operation for n > 1 */
2979 if (step_multi && stop_step)
2982 target_terminal_ours ();
2984 /* Look up the hook_stop and run it (CLI internally handles problem
2985 of stop_command's pre-hook not existing). */
2987 catch_errors (hook_stop_stub, stop_command,
2988 "Error while running hook_stop:\n", RETURN_MASK_ALL);
2990 if (!target_has_stack)
2996 /* Select innermost stack frame - i.e., current frame is frame 0,
2997 and current location is based on that.
2998 Don't do this on return from a stack dummy routine,
2999 or if the program has exited. */
3001 if (!stop_stack_dummy)
3003 select_frame (get_current_frame ());
3005 /* Print current location without a level number, if
3006 we have changed functions or hit a breakpoint.
3007 Print source line if we have one.
3008 bpstat_print() contains the logic deciding in detail
3009 what to print, based on the event(s) that just occurred. */
3011 if (stop_print_frame && deprecated_selected_frame)
3015 int do_frame_printing = 1;
3017 bpstat_ret = bpstat_print (stop_bpstat);
3021 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3022 (or should) carry around the function and does (or
3023 should) use that when doing a frame comparison. */
3025 && frame_id_eq (step_frame_id,
3026 get_frame_id (get_current_frame ()))
3027 && step_start_function == find_pc_function (stop_pc))
3028 source_flag = SRC_LINE; /* finished step, just print source line */
3030 source_flag = SRC_AND_LOC; /* print location and source line */
3032 case PRINT_SRC_AND_LOC:
3033 source_flag = SRC_AND_LOC; /* print location and source line */
3035 case PRINT_SRC_ONLY:
3036 source_flag = SRC_LINE;
3039 source_flag = SRC_LINE; /* something bogus */
3040 do_frame_printing = 0;
3043 internal_error (__FILE__, __LINE__, "Unknown value.");
3045 /* For mi, have the same behavior every time we stop:
3046 print everything but the source line. */
3047 if (ui_out_is_mi_like_p (uiout))
3048 source_flag = LOC_AND_ADDRESS;
3050 if (ui_out_is_mi_like_p (uiout))
3051 ui_out_field_int (uiout, "thread-id",
3052 pid_to_thread_id (inferior_ptid));
3053 /* The behavior of this routine with respect to the source
3055 SRC_LINE: Print only source line
3056 LOCATION: Print only location
3057 SRC_AND_LOC: Print location and source line */
3058 if (do_frame_printing)
3059 print_stack_frame (get_selected_frame (), 0, source_flag);
3061 /* Display the auto-display expressions. */
3066 /* Save the function value return registers, if we care.
3067 We might be about to restore their previous contents. */
3068 if (proceed_to_finish)
3069 /* NB: The copy goes through to the target picking up the value of
3070 all the registers. */
3071 regcache_cpy (stop_registers, current_regcache);
3073 if (stop_stack_dummy)
3075 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3076 ends with a setting of the current frame, so we can use that
3078 frame_pop (get_current_frame ());
3079 /* Set stop_pc to what it was before we called the function.
3080 Can't rely on restore_inferior_status because that only gets
3081 called if we don't stop in the called function. */
3082 stop_pc = read_pc ();
3083 select_frame (get_current_frame ());
3087 annotate_stopped ();
3088 observer_notify_normal_stop (stop_bpstat);
3092 hook_stop_stub (void *cmd)
3094 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3099 signal_stop_state (int signo)
3101 return signal_stop[signo];
3105 signal_print_state (int signo)
3107 return signal_print[signo];
3111 signal_pass_state (int signo)
3113 return signal_program[signo];
3117 signal_stop_update (int signo, int state)
3119 int ret = signal_stop[signo];
3120 signal_stop[signo] = state;
3125 signal_print_update (int signo, int state)
3127 int ret = signal_print[signo];
3128 signal_print[signo] = state;
3133 signal_pass_update (int signo, int state)
3135 int ret = signal_program[signo];
3136 signal_program[signo] = state;
3141 sig_print_header (void)
3144 Signal Stop\tPrint\tPass to program\tDescription\n");
3148 sig_print_info (enum target_signal oursig)
3150 char *name = target_signal_to_name (oursig);
3151 int name_padding = 13 - strlen (name);
3153 if (name_padding <= 0)
3156 printf_filtered ("%s", name);
3157 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3158 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3159 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3160 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3161 printf_filtered ("%s\n", target_signal_to_string (oursig));
3164 /* Specify how various signals in the inferior should be handled. */
3167 handle_command (char *args, int from_tty)
3170 int digits, wordlen;
3171 int sigfirst, signum, siglast;
3172 enum target_signal oursig;
3175 unsigned char *sigs;
3176 struct cleanup *old_chain;
3180 error_no_arg ("signal to handle");
3183 /* Allocate and zero an array of flags for which signals to handle. */
3185 nsigs = (int) TARGET_SIGNAL_LAST;
3186 sigs = (unsigned char *) alloca (nsigs);
3187 memset (sigs, 0, nsigs);
3189 /* Break the command line up into args. */
3191 argv = buildargv (args);
3196 old_chain = make_cleanup_freeargv (argv);
3198 /* Walk through the args, looking for signal oursigs, signal names, and
3199 actions. Signal numbers and signal names may be interspersed with
3200 actions, with the actions being performed for all signals cumulatively
3201 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3203 while (*argv != NULL)
3205 wordlen = strlen (*argv);
3206 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3210 sigfirst = siglast = -1;
3212 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3214 /* Apply action to all signals except those used by the
3215 debugger. Silently skip those. */
3218 siglast = nsigs - 1;
3220 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3222 SET_SIGS (nsigs, sigs, signal_stop);
3223 SET_SIGS (nsigs, sigs, signal_print);
3225 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3227 UNSET_SIGS (nsigs, sigs, signal_program);
3229 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3231 SET_SIGS (nsigs, sigs, signal_print);
3233 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3235 SET_SIGS (nsigs, sigs, signal_program);
3237 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3239 UNSET_SIGS (nsigs, sigs, signal_stop);
3241 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3243 SET_SIGS (nsigs, sigs, signal_program);
3245 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3247 UNSET_SIGS (nsigs, sigs, signal_print);
3248 UNSET_SIGS (nsigs, sigs, signal_stop);
3250 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3252 UNSET_SIGS (nsigs, sigs, signal_program);
3254 else if (digits > 0)
3256 /* It is numeric. The numeric signal refers to our own
3257 internal signal numbering from target.h, not to host/target
3258 signal number. This is a feature; users really should be
3259 using symbolic names anyway, and the common ones like
3260 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3262 sigfirst = siglast = (int)
3263 target_signal_from_command (atoi (*argv));
3264 if ((*argv)[digits] == '-')
3267 target_signal_from_command (atoi ((*argv) + digits + 1));
3269 if (sigfirst > siglast)
3271 /* Bet he didn't figure we'd think of this case... */
3279 oursig = target_signal_from_name (*argv);
3280 if (oursig != TARGET_SIGNAL_UNKNOWN)
3282 sigfirst = siglast = (int) oursig;
3286 /* Not a number and not a recognized flag word => complain. */
3287 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3291 /* If any signal numbers or symbol names were found, set flags for
3292 which signals to apply actions to. */
3294 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3296 switch ((enum target_signal) signum)
3298 case TARGET_SIGNAL_TRAP:
3299 case TARGET_SIGNAL_INT:
3300 if (!allsigs && !sigs[signum])
3302 if (query ("%s is used by the debugger.\n\
3303 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3309 printf_unfiltered ("Not confirmed, unchanged.\n");
3310 gdb_flush (gdb_stdout);
3314 case TARGET_SIGNAL_0:
3315 case TARGET_SIGNAL_DEFAULT:
3316 case TARGET_SIGNAL_UNKNOWN:
3317 /* Make sure that "all" doesn't print these. */
3328 target_notice_signals (inferior_ptid);
3332 /* Show the results. */
3333 sig_print_header ();
3334 for (signum = 0; signum < nsigs; signum++)
3338 sig_print_info (signum);
3343 do_cleanups (old_chain);
3347 xdb_handle_command (char *args, int from_tty)
3350 struct cleanup *old_chain;
3352 /* Break the command line up into args. */
3354 argv = buildargv (args);
3359 old_chain = make_cleanup_freeargv (argv);
3360 if (argv[1] != (char *) NULL)
3365 bufLen = strlen (argv[0]) + 20;
3366 argBuf = (char *) xmalloc (bufLen);
3370 enum target_signal oursig;
3372 oursig = target_signal_from_name (argv[0]);
3373 memset (argBuf, 0, bufLen);
3374 if (strcmp (argv[1], "Q") == 0)
3375 sprintf (argBuf, "%s %s", argv[0], "noprint");
3378 if (strcmp (argv[1], "s") == 0)
3380 if (!signal_stop[oursig])
3381 sprintf (argBuf, "%s %s", argv[0], "stop");
3383 sprintf (argBuf, "%s %s", argv[0], "nostop");
3385 else if (strcmp (argv[1], "i") == 0)
3387 if (!signal_program[oursig])
3388 sprintf (argBuf, "%s %s", argv[0], "pass");
3390 sprintf (argBuf, "%s %s", argv[0], "nopass");
3392 else if (strcmp (argv[1], "r") == 0)
3394 if (!signal_print[oursig])
3395 sprintf (argBuf, "%s %s", argv[0], "print");
3397 sprintf (argBuf, "%s %s", argv[0], "noprint");
3403 handle_command (argBuf, from_tty);
3405 printf_filtered ("Invalid signal handling flag.\n");
3410 do_cleanups (old_chain);
3413 /* Print current contents of the tables set by the handle command.
3414 It is possible we should just be printing signals actually used
3415 by the current target (but for things to work right when switching
3416 targets, all signals should be in the signal tables). */
3419 signals_info (char *signum_exp, int from_tty)
3421 enum target_signal oursig;
3422 sig_print_header ();
3426 /* First see if this is a symbol name. */
3427 oursig = target_signal_from_name (signum_exp);
3428 if (oursig == TARGET_SIGNAL_UNKNOWN)
3430 /* No, try numeric. */
3432 target_signal_from_command (parse_and_eval_long (signum_exp));
3434 sig_print_info (oursig);
3438 printf_filtered ("\n");
3439 /* These ugly casts brought to you by the native VAX compiler. */
3440 for (oursig = TARGET_SIGNAL_FIRST;
3441 (int) oursig < (int) TARGET_SIGNAL_LAST;
3442 oursig = (enum target_signal) ((int) oursig + 1))
3446 if (oursig != TARGET_SIGNAL_UNKNOWN
3447 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3448 sig_print_info (oursig);
3451 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3454 struct inferior_status
3456 enum target_signal stop_signal;
3460 int stop_stack_dummy;
3461 int stopped_by_random_signal;
3463 CORE_ADDR step_range_start;
3464 CORE_ADDR step_range_end;
3465 struct frame_id step_frame_id;
3466 enum step_over_calls_kind step_over_calls;
3467 CORE_ADDR step_resume_break_address;
3468 int stop_after_trap;
3470 struct regcache *stop_registers;
3472 /* These are here because if call_function_by_hand has written some
3473 registers and then decides to call error(), we better not have changed
3475 struct regcache *registers;
3477 /* A frame unique identifier. */
3478 struct frame_id selected_frame_id;
3480 int breakpoint_proceeded;
3481 int restore_stack_info;
3482 int proceed_to_finish;
3486 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3489 int size = DEPRECATED_REGISTER_RAW_SIZE (regno);
3490 void *buf = alloca (size);
3491 store_signed_integer (buf, size, val);
3492 regcache_raw_write (inf_status->registers, regno, buf);
3495 /* Save all of the information associated with the inferior<==>gdb
3496 connection. INF_STATUS is a pointer to a "struct inferior_status"
3497 (defined in inferior.h). */
3499 struct inferior_status *
3500 save_inferior_status (int restore_stack_info)
3502 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3504 inf_status->stop_signal = stop_signal;
3505 inf_status->stop_pc = stop_pc;
3506 inf_status->stop_step = stop_step;
3507 inf_status->stop_stack_dummy = stop_stack_dummy;
3508 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3509 inf_status->trap_expected = trap_expected;
3510 inf_status->step_range_start = step_range_start;
3511 inf_status->step_range_end = step_range_end;
3512 inf_status->step_frame_id = step_frame_id;
3513 inf_status->step_over_calls = step_over_calls;
3514 inf_status->stop_after_trap = stop_after_trap;
3515 inf_status->stop_soon = stop_soon;
3516 /* Save original bpstat chain here; replace it with copy of chain.
3517 If caller's caller is walking the chain, they'll be happier if we
3518 hand them back the original chain when restore_inferior_status is
3520 inf_status->stop_bpstat = stop_bpstat;
3521 stop_bpstat = bpstat_copy (stop_bpstat);
3522 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3523 inf_status->restore_stack_info = restore_stack_info;
3524 inf_status->proceed_to_finish = proceed_to_finish;
3526 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3528 inf_status->registers = regcache_dup (current_regcache);
3530 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3535 restore_selected_frame (void *args)
3537 struct frame_id *fid = (struct frame_id *) args;
3538 struct frame_info *frame;
3540 frame = frame_find_by_id (*fid);
3542 /* If inf_status->selected_frame_id is NULL, there was no previously
3546 warning ("Unable to restore previously selected frame.\n");
3550 select_frame (frame);
3556 restore_inferior_status (struct inferior_status *inf_status)
3558 stop_signal = inf_status->stop_signal;
3559 stop_pc = inf_status->stop_pc;
3560 stop_step = inf_status->stop_step;
3561 stop_stack_dummy = inf_status->stop_stack_dummy;
3562 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3563 trap_expected = inf_status->trap_expected;
3564 step_range_start = inf_status->step_range_start;
3565 step_range_end = inf_status->step_range_end;
3566 step_frame_id = inf_status->step_frame_id;
3567 step_over_calls = inf_status->step_over_calls;
3568 stop_after_trap = inf_status->stop_after_trap;
3569 stop_soon = inf_status->stop_soon;
3570 bpstat_clear (&stop_bpstat);
3571 stop_bpstat = inf_status->stop_bpstat;
3572 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3573 proceed_to_finish = inf_status->proceed_to_finish;
3575 /* FIXME: Is the restore of stop_registers always needed. */
3576 regcache_xfree (stop_registers);
3577 stop_registers = inf_status->stop_registers;
3579 /* The inferior can be gone if the user types "print exit(0)"
3580 (and perhaps other times). */
3581 if (target_has_execution)
3582 /* NB: The register write goes through to the target. */
3583 regcache_cpy (current_regcache, inf_status->registers);
3584 regcache_xfree (inf_status->registers);
3586 /* FIXME: If we are being called after stopping in a function which
3587 is called from gdb, we should not be trying to restore the
3588 selected frame; it just prints a spurious error message (The
3589 message is useful, however, in detecting bugs in gdb (like if gdb
3590 clobbers the stack)). In fact, should we be restoring the
3591 inferior status at all in that case? . */
3593 if (target_has_stack && inf_status->restore_stack_info)
3595 /* The point of catch_errors is that if the stack is clobbered,
3596 walking the stack might encounter a garbage pointer and
3597 error() trying to dereference it. */
3599 (restore_selected_frame, &inf_status->selected_frame_id,
3600 "Unable to restore previously selected frame:\n",
3601 RETURN_MASK_ERROR) == 0)
3602 /* Error in restoring the selected frame. Select the innermost
3604 select_frame (get_current_frame ());
3612 do_restore_inferior_status_cleanup (void *sts)
3614 restore_inferior_status (sts);
3618 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3620 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3624 discard_inferior_status (struct inferior_status *inf_status)
3626 /* See save_inferior_status for info on stop_bpstat. */
3627 bpstat_clear (&inf_status->stop_bpstat);
3628 regcache_xfree (inf_status->registers);
3629 regcache_xfree (inf_status->stop_registers);
3634 inferior_has_forked (int pid, int *child_pid)
3636 struct target_waitstatus last;
3639 get_last_target_status (&last_ptid, &last);
3641 if (last.kind != TARGET_WAITKIND_FORKED)
3644 if (ptid_get_pid (last_ptid) != pid)
3647 *child_pid = last.value.related_pid;
3652 inferior_has_vforked (int pid, int *child_pid)
3654 struct target_waitstatus last;
3657 get_last_target_status (&last_ptid, &last);
3659 if (last.kind != TARGET_WAITKIND_VFORKED)
3662 if (ptid_get_pid (last_ptid) != pid)
3665 *child_pid = last.value.related_pid;
3670 inferior_has_execd (int pid, char **execd_pathname)
3672 struct target_waitstatus last;
3675 get_last_target_status (&last_ptid, &last);
3677 if (last.kind != TARGET_WAITKIND_EXECD)
3680 if (ptid_get_pid (last_ptid) != pid)
3683 *execd_pathname = xstrdup (last.value.execd_pathname);
3687 /* Oft used ptids */
3689 ptid_t minus_one_ptid;
3691 /* Create a ptid given the necessary PID, LWP, and TID components. */
3694 ptid_build (int pid, long lwp, long tid)
3704 /* Create a ptid from just a pid. */
3707 pid_to_ptid (int pid)
3709 return ptid_build (pid, 0, 0);
3712 /* Fetch the pid (process id) component from a ptid. */
3715 ptid_get_pid (ptid_t ptid)
3720 /* Fetch the lwp (lightweight process) component from a ptid. */
3723 ptid_get_lwp (ptid_t ptid)
3728 /* Fetch the tid (thread id) component from a ptid. */
3731 ptid_get_tid (ptid_t ptid)
3736 /* ptid_equal() is used to test equality of two ptids. */
3739 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3741 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3742 && ptid1.tid == ptid2.tid);
3745 /* restore_inferior_ptid() will be used by the cleanup machinery
3746 to restore the inferior_ptid value saved in a call to
3747 save_inferior_ptid(). */
3750 restore_inferior_ptid (void *arg)
3752 ptid_t *saved_ptid_ptr = arg;
3753 inferior_ptid = *saved_ptid_ptr;
3757 /* Save the value of inferior_ptid so that it may be restored by a
3758 later call to do_cleanups(). Returns the struct cleanup pointer
3759 needed for later doing the cleanup. */
3762 save_inferior_ptid (void)
3764 ptid_t *saved_ptid_ptr;
3766 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3767 *saved_ptid_ptr = inferior_ptid;
3768 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3775 stop_registers = regcache_xmalloc (current_gdbarch);
3779 _initialize_infrun (void)
3783 struct cmd_list_element *c;
3785 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers);
3786 deprecated_register_gdbarch_swap (NULL, 0, build_infrun);
3788 add_info ("signals", signals_info,
3789 "What debugger does when program gets various signals.\n\
3790 Specify a signal as argument to print info on that signal only.");
3791 add_info_alias ("handle", "signals", 0);
3793 add_com ("handle", class_run, handle_command,
3794 concat ("Specify how to handle a signal.\n\
3795 Args are signals and actions to apply to those signals.\n\
3796 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3797 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3798 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3799 The special arg \"all\" is recognized to mean all signals except those\n\
3800 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3801 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3802 Stop means reenter debugger if this signal happens (implies print).\n\
3803 Print means print a message if this signal happens.\n\
3804 Pass means let program see this signal; otherwise program doesn't know.\n\
3805 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3806 Pass and Stop may be combined.", NULL));
3809 add_com ("lz", class_info, signals_info,
3810 "What debugger does when program gets various signals.\n\
3811 Specify a signal as argument to print info on that signal only.");
3812 add_com ("z", class_run, xdb_handle_command,
3813 concat ("Specify how to handle a signal.\n\
3814 Args are signals and actions to apply to those signals.\n\
3815 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3816 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3817 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3818 The special arg \"all\" is recognized to mean all signals except those\n\
3819 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3820 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3821 nopass), \"Q\" (noprint)\n\
3822 Stop means reenter debugger if this signal happens (implies print).\n\
3823 Print means print a message if this signal happens.\n\
3824 Pass means let program see this signal; otherwise program doesn't know.\n\
3825 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3826 Pass and Stop may be combined.", NULL));
3831 add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\
3832 This allows you to set a list of commands to be run each time execution\n\
3833 of the program stops.", &cmdlist);
3835 numsigs = (int) TARGET_SIGNAL_LAST;
3836 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
3837 signal_print = (unsigned char *)
3838 xmalloc (sizeof (signal_print[0]) * numsigs);
3839 signal_program = (unsigned char *)
3840 xmalloc (sizeof (signal_program[0]) * numsigs);
3841 for (i = 0; i < numsigs; i++)
3844 signal_print[i] = 1;
3845 signal_program[i] = 1;
3848 /* Signals caused by debugger's own actions
3849 should not be given to the program afterwards. */
3850 signal_program[TARGET_SIGNAL_TRAP] = 0;
3851 signal_program[TARGET_SIGNAL_INT] = 0;
3853 /* Signals that are not errors should not normally enter the debugger. */
3854 signal_stop[TARGET_SIGNAL_ALRM] = 0;
3855 signal_print[TARGET_SIGNAL_ALRM] = 0;
3856 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
3857 signal_print[TARGET_SIGNAL_VTALRM] = 0;
3858 signal_stop[TARGET_SIGNAL_PROF] = 0;
3859 signal_print[TARGET_SIGNAL_PROF] = 0;
3860 signal_stop[TARGET_SIGNAL_CHLD] = 0;
3861 signal_print[TARGET_SIGNAL_CHLD] = 0;
3862 signal_stop[TARGET_SIGNAL_IO] = 0;
3863 signal_print[TARGET_SIGNAL_IO] = 0;
3864 signal_stop[TARGET_SIGNAL_POLL] = 0;
3865 signal_print[TARGET_SIGNAL_POLL] = 0;
3866 signal_stop[TARGET_SIGNAL_URG] = 0;
3867 signal_print[TARGET_SIGNAL_URG] = 0;
3868 signal_stop[TARGET_SIGNAL_WINCH] = 0;
3869 signal_print[TARGET_SIGNAL_WINCH] = 0;
3871 /* These signals are used internally by user-level thread
3872 implementations. (See signal(5) on Solaris.) Like the above
3873 signals, a healthy program receives and handles them as part of
3874 its normal operation. */
3875 signal_stop[TARGET_SIGNAL_LWP] = 0;
3876 signal_print[TARGET_SIGNAL_LWP] = 0;
3877 signal_stop[TARGET_SIGNAL_WAITING] = 0;
3878 signal_print[TARGET_SIGNAL_WAITING] = 0;
3879 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
3880 signal_print[TARGET_SIGNAL_CANCEL] = 0;
3884 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
3885 (char *) &stop_on_solib_events,
3886 "Set stopping for shared library events.\n\
3887 If nonzero, gdb will give control to the user when the dynamic linker\n\
3888 notifies gdb of shared library events. The most common event of interest\n\
3889 to the user would be loading/unloading of a new library.\n", &setlist), &showlist);
3892 c = add_set_enum_cmd ("follow-fork-mode",
3894 follow_fork_mode_kind_names, &follow_fork_mode_string,
3895 "Set debugger response to a program call of fork \
3897 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3898 parent - the original process is debugged after a fork\n\
3899 child - the new process is debugged after a fork\n\
3900 The unfollowed process will continue to run.\n\
3901 By default, the debugger will follow the parent process.", &setlist);
3902 add_show_from_set (c, &showlist);
3904 c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */
3905 &scheduler_mode, /* current mode */
3906 "Set mode for locking scheduler during execution.\n\
3907 off == no locking (threads may preempt at any time)\n\
3908 on == full locking (no thread except the current thread may run)\n\
3909 step == scheduler locked during every single-step operation.\n\
3910 In this mode, no other thread may run during a step command.\n\
3911 Other threads may run while stepping over a function call ('next').", &setlist);
3913 set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */
3914 add_show_from_set (c, &showlist);
3916 c = add_set_cmd ("step-mode", class_run,
3917 var_boolean, (char *) &step_stop_if_no_debug,
3918 "Set mode of the step operation. When set, doing a step over a\n\
3919 function without debug line information will stop at the first\n\
3920 instruction of that function. Otherwise, the function is skipped and\n\
3921 the step command stops at a different source line.", &setlist);
3922 add_show_from_set (c, &showlist);
3924 /* ptid initializations */
3925 null_ptid = ptid_build (0, 0, 0);
3926 minus_one_ptid = ptid_build (-1, 0, 0);
3927 inferior_ptid = null_ptid;
3928 target_last_wait_ptid = minus_one_ptid;